US 2598106 A
Description (OCR text may contain errors)
May 27, 1952 F. A. BOYLE 1 DRILLING ATTACHMENT FOR RIVETING MACHINES Filed 001;. 4, 1949 4 Sheets-Sheet 1 IN V EN TOR.
Frank A. Boy/e May 27, 1952 F. A. BOYLE DRILLING ATTACHMENT FOR RIVETING MACHINES 4 Sheets-Sheet 2 Filed Oct. 4, 1949 y 7 2 F. A. BOYLE 2,598,106
DRILLING ATTACHMENT FOR RIVETING MACHINES Filed Oct. 4, 1949 4 Sheets-Sheet 5 "Hul- I N VEN TOR.
an k A 50 la igw F. A. BOYLE DRILLING ATTACHMENT FOR RIVETING MACHINES May 27, 1952 4 Sheets-Sheet 4 Filed Oct. 4, 1949 INVENTOR.
frank A. 50 la Patented May 27, 1952 UNITED STATES PATENT GFFECE- DRILLING ATTACHMENT FOR RIVETIN G MACHINES Frank A. Boyle," San Diego, Calif., assignor to- Gonsolidated Vultee Aircraft Gcrporation, San Diego, Galifi, a corporationof- Delaware- Application'October 4, 1949, Serial No. 119,469
are-required to rivet metal'sheets or workpieces,
particularly sheets or work pieces of aluminum and aluminum alloys, to employ automatic punching and riveting machine. With the development of the trend toward higher speed airplanes, which embody heavier andheavier skins,
the combined thicknesses of parts to be riveted reach a point where the automatic punching. and riveting machines cannot effectively and efiiciently perform their function. It is therefore generally the object of" this invention to provide an attachment for an automatic riveting. mae chine which will adapt it for use with work pieces having relatively. greater combined thicknesses than were formerly encountered. The attachment will further adapt the machine for perforating and riveting material, such as steel; which normally is too thick and heavy topunch by conventional means;
The invention has for a principal object the provision, in a riveting machine of the character above described, of an improved form of drilling,
from, to maintain the individual parts of the work piece in" position for" the performance of the riveting operation.
Another object of the invention resides in,
the provisionof a novel drive system for effecting operation of the" drill attachment.
Still another object of the invention lies in providing automatically operative means associated' with the drill attachment to" provide current of air for cleaning the drilled openings" of dust and chips created'by'the drill;
Another object ofthe'invention isto provide a drilling attachment having an improved? form of gage device for determining the depth; of the perforation made by' the cutting tool;
A' further object of the invention isto provide in a, machine. of'the character described an improved holding attachment adapted during the drilling operation to press the juxtaposed work pieces firmly into engagement with one another. to prevent metal particles fromsifting between the workpieces while-the drill is acting upon. them.
Another object of the invention isto provide a drilling. attachment which is generally of new and improved construction, may. be manufactured at a comparatively low cost and effectively and efficiently fulfills its intended purpose.
Other objects and features of the present invention will be readily apparent to those skilled in the. art from the followingspecification and appended drawings wherein is illustrated a preferred. formof the invention, andin which:
Figure 1 is a general perspective view of a rivetingmachine embodying the drilling attachment in accordance with thepresent invention;
Figure 2 is an enlargedfragmentary view, in side elevation, showing the drilling attachment in operative position;
Fi'gure3 is an enlarged'fragment'ary view, but in front elevation, showing the drilling attachment in operative position;
Figure 4'is a-perspective viewjof' the stop assembly' for the air cylinder piston;
Figure 5 is a perspective view of the cutting tool;
Figure dis a perspectiveview of the gaging means for'the drilling attachment;
Figure '7 is. a side elevational view of the drill tion, illustrating the air motor for driving, the
Figure 11 is a fragmentary view, partly in elevation and partly in section, of the air flow controlling apparatus for determining the operation of the drive motor of the drilling'unit'a nd for governing the flow of blast air for clearing" away drill chips;
Figure 12 is a perspective view of the cam actuator member which is movable to operate the air flow controlling apparatus;
Figure 13-is a fragmental view, in perspective,
of the operating mechanismfor the cam; actuator member;
Figure 14 is a fragmental view, partly in-section, of the anvil assembly showing the pilot and locating pin;
Figure is a fragmental view, partly in section, of a detail of the anvil assembly;
Figure 16 is an elevational view of the work clamping assembly; and
Figure 17 is a fragmental perspective view of the clamping arm.
The drilling attachment of the present invention is contemplated for use with those machines which are adapted automatically to insert rivets in perforations formed in the material to be riveted and to complete the riveting operation by heading the rivets. Embodied in such machines is a reciprocating pressure plunger-rivet set which will be operative during both the perforating and riveting operation to assist in the performance of these operations.
The automatic riveting machine employed may be of any well known construction, such as the Erco Automatic Punching and Riveting Machine, Model 1002 made by the Engineering and Research Corporation of Riverdale, Maryland, and embodying the principles of U. S. Patents 1,990,998 and 2,056,559. The punch or perforating mechanism of the above machine will be supplanted by the drilling attachment of the present invention. Since it is understood that this machine is to be regarded merely as illustrative of the type of machine with which the drilling attachment of this invention may be used the machine will therefore be described only with such particularity as is necessary to an understanding of the invention.
An automatic riveting machine of the type above mentioned, is shown in the drawings and is there designated generally by the numeral It. This machine H3 is adapted to perform, sequentially, a series of operations, namely, perforating the work to be riveted, automatically feeding rivets into the perforations formed and then heading the rivets, and the machine It! will perform these various operations without there being any movement of the work between operations.
The riveting machine |B normally comprises a generally C-shaped yoke or frame H of relatively massive size supported in up-right position by an integral base or pedestal portion H2. The yoke comprises vertically spaced apart arms or jaws l3 and I4, which jaws are of substantial length to effect a long work receiving throat in order that work pieces of considerable width may be accommodated by the machine H].
To the upper yoke jaw i3 is suitably afiixed a drilling mechanism |5, a rivet holding assembly Hi and a reciprocating pressure applying shaft or plunger H, which elements accomplish the operations of perforating the work piece and of feeding the rivets into the perforations. The lower jaw l4 mounts an anvil assembly H! which is operative to support the work piece and to effect heading of the rivets inserted into the perforations.
The drilling mechanism |5 comprises a drilling unit 2| supported by a swinging arm 22 which is secured, at its upper end, to a rotatable and reciprocable shaft 23 suitably mounted in yoke jaw Hi. The rivet holding assembly l6, positioned adjacent the drilling unit 2|, is of conventional construction and comprises a usual rivet shoe 24 carried by a swingable support member or arm 25 which in turn is mounted, at its upper end, on a rotatable and reciprocable shaft 26 suitably supported by upper jaw 13. The rivet shoe 24 serves to support rivets therein, which are received from a rivet tube 2'! and to deposit such rivets in perforations made in the work piece by the drilling unit 2|. The swingable supporting arms 22 and 25 are suitably mounted in upper jaw |3 of machine In and are controlled by suitable mechanisms embodied therein so as to present the drilling unit 2| and the rivet shoe 24 in alternate sequence below the reciprocating plunger H for cooperation therewith. The drilling unit 2| and the rivet supporting shoe 24 are adapted to move pivotally and in unison on the completion of each perforating and each riveting operation. The means and mechanism provided by machine ||l for mounting the shafts 23 and 26 to the upper jaw l3 and for effecting their simultaneous rotative movement to move the drilling unit 2| and the rivet shoe 24 in unison are conventional and well known to those skilled in the art and there is no need, therefore, for a particularized description to be made of such means and mechanism.
Figures 2 and 3 show the drilling unit 2| located in operative position upon a work piece 28, being held thereupon under the pressure of the plunger The plunger ll is suitably mounted in upper jaw 13 of machine l8 so as to have a reciprocating movement. In such movement plunger H is adapted to engage and carry the drill unit 2| downwardly toward the work piece, in a manner hereinafter to be more fully described, and maintain it thereupon until the drilling operation is completed. Thereafter the plunger l! is retreated and the drilling unit 2| returns to the position of Figure 1, after which the supporting arm 22 for the drilling unit 2| and the supporting arm 25 carrying the rivet shoe 24 swing or rotate in unison and exchange places beneath the plunger Rivet shoe 24 is then in position to be engaged by plunger IT, in its next longitudinal movement, to be carried thereby to the work piece 28 to cause a rivet to be inserted into the hole formed for its reception by drilling unit 2|, the plunger acting as a rivet set, maintains pressure on the rivet until it is headed upon the anvil assembly l8. After the riveting operation the plunger H and the rivet shoe 24 both return to their upper position and the machine is then ready for the drilling unit 2| to be swung beneath the plunger I! to begin the next series of operations. The purpose of the reciprocating plunger thus is to assist in the performance of both the drilling operation and the rivet inserting and rivet heading operation.
For actuation of the reciprocating plunger l1 there is provided a usual air cylinder 3| mounted on the upper jaw I3. The air cylinder 3| contains a reciprocable piston 32 adapted to be moved downwardly by air under pressure introduced through a port (not shown) into the air cylinder above the piston 32. A piston rod 33 is connected to piston 32 and extends to either side thereof. The portion 34 of the piston rod 33 which extends downwardly from piston 32 projects out of the lower end of the cylinder 3| and is adapted to have the plunger suitably secured to it. A spring 35 located within the cylinder above the piston 32 is suitably connected to the upwardly extending portion 36 of piston rod 33 and is adapted to be compressed upon the downward movement of the piston 32. Spring 35 expands, on release of the air pressure applied to piston 32, to return the piston 32 to its rest position and carry the plunger upwardly with it and thereby relieve the pressure being applied to the drilling unit 2| or the rivet sho 24,. whiche er hap n t be n e easem n w th'znlunee The su po t Z2. Q t d llin unit :2! and the su po ar car yi g the vet sh e 2e. r ac ad pte normal y t occupy a po i i n ye eallv s ac d from the anvil assembly [8 and the worl resting thereupon. Usual spring means, not shown. ar r v de Wit i up r oke l w 3 fo ope at on ith he recip ca ha ts .3 and i which espec ively a ry the su rt a s 22 and "2-5. These. spr n m a s co tinually xe t the r bias to ma tain the shafts 3 and 26 n thei upp r posit o so that movement of the support arms 22 a d downwardl b he p u er ll w ll be accomn shedagainst the fierc of t ese spri means. Whenplun er If! i wi hdrawnby piston 32 th supp rt arms 22 and 2.5 are moved upw rdly by he sha ts .23 an 25. which automati ally are returned to their up e position. under the b as of heir cooperatinsreturn spring means.
Introduction of air under pressure to the air cylinder 3 l and sequencing actuation of the, drillingunit supportarm 22 and the rivet shoe sup: port arm .25 are controlled, in usual manner, remotely from a conventional foot operated control member 37, which embodies a plurality of air valves v(n t shown) a tu ed indi id y y anurnber of foot pedals 39. The foot operated c ntrol member 31. throu h it pe al ac uat air vaIVes Qverns the feedi g of compressed a received from an outside source of supply (not shown) through an air lead 38 to effect the opat n of th dri n unit 15,. th ri upport n ass mb y l6 and the reci catin p un or H. A pair of air leads ii and 42 connect the foot operated control member 31- and a conventional shift cylinder assembly 43 which affords the pDWer for operation of theair cylinder 3!. The shift cylinder assembly 43 is adapted to opcrate a conventional cable and pulley arrangement 4 4 to actuate appropriate linkage (not shown) which will effect rotative movement of shafts 23 and 28 to pivot the drilling unit 2% and rivet shoe 24 so that, alternately, eachoc- L cupies a position directly beneath reciprocating plun er ll to enable movement thereby.
An air lead 4 5 channels air from the main air l ad 3,3 to suitable mechanism, hereinafter to be described, which operates the drill unit 2!.
Suitable connections are provided between air lead .45 and a usual regulator valve 46 and a usual master control valve 4;?- for feeding air to these valves. The regulator valve 48; provides air. under desired pressure to the anvil assembly l 8;,,for use thereby in the support of theworl; piece. The master control valve Ill connects throughair'lead 50 to the air cylinder 3} to provide. the power for operation of the piston 32 and to exhaust the air from cylinder. 3!. The pulley and cable arrangement 4}! through linkage, now shown, controls the operation of the master control valve 47 to determine theperiods and speed of feeding and of exhausting air from air. cylinder 3| during the drilling and rivet setting operations.
It is here particularly emphasized that the details of construction of the air cylinder H, the support arms 22 and 2 5-, the structure for effecting rotation of these arms, the main control valve 41, the regulator valve 46, the shift cylinder assembly 43, the foot operated control member 33!, and the arrangement and operation of such elements form no .part of the present invention. These. elements are, the. principal standard w rldne parts of a eemmercia ly and ab e automati rive n -machine. in he. machi e employed herein i well known to tho sk ll d n the a t is notrn ces ary to d scr be i n ny u her eta t an has be n done for a read unde standin of ts co stru tion d operat on- .The drill unit 21, in accordance with the present invention, comprises, as best shown in Figures 1, Band 9, a composite ear housing 5| formed of upper and lower body portions 52 and 53, which aresecnred one to the other .by screwsfi l. Each of the body portions .52 .and .53. are provided with a plurality of recesses 55 formed in a row therein;
* the. recesses 55. of upper body portion 52 are adapted to align with the recesses 55 of thelower body portion 53; when the body portion 152 and 53 are .ioined tonne another to form a series of .threelongitndinally spaced gear chambers 5.6, 57 :and .158 with the center chamber .51 having intercommunication with the ,end chambers 56. and .55.
A gear train 59 .is provided'within housing 5! and comprises a drivegear 6.1 which meshes. with i an :idler gear .62 which in turn meshes with a driving gear .63. The drive gear 6.! located within gear chamber 156 and is secured to .or formed integral with shaft 6'4, which shaft is journalled at each end by being mounted in spaced ball bearing journals .675 and '56 provided in chamber 56. The idler gear .62 is disposed in gear chamber 5,? and is secured to orformedintegral with a shaft 517;. A pair of spaced roller bearings .63 and 6.9 in chamber- 51 journal the shaft 6.1. The driving ,gear- 63 is positioned in the third gear chamber 58 and also is secured to .or formed integral with a shaft ,7]. Shaft 'H is mounted for rotative movement by being journalled in ball bearing journals l2; and E13, disposed on either side of driving gear 163 and located in .gear chamber 58,.
.Shaft ,H .for driving gear 63 has one end thereof extending through an opening in the base of lower body portion 53, and isexternally threaded at this end as indicated at M. A cutting tool E5 is adapted to be secured to the shaft H .for actuation thereby. This cutting tool [5 may be of any. selected type, diameter and length and for purpose of illustration of this invention is herein shown as a combination countersink and drill member. This member 15 is positioned below driving-gear .63 and in axial alignment with shait ii and comprises a cylindrical shank l6, having at one end an internally threaded bore 11 and at the opposite end a conical countersinking-pqr tionlfi comprising an annular series of equidistantly spaced downwardly and inwardly inclinedtcutting. edges 79., and projecting below and from the .countersinking portion [8 is a drilling portion 8!. having generally longitudinally extending cutting edges 82.
The. externally threaded end 74 of shaft 'il is received within internally threaded bore 17- to connect the combination countersink and drill member 15 to. the gear train '59 to be powered thereby.
A ing means fidisgpm il eli o e er i ing the depth of; the hole and the depth of the countersinkmade by. the cutting; tool '15. This gaging means 83; comprisesa internally threaded ring 3,4 having its upper end castellated to provide an, annular series of equidistantly spaced upstanding teeth 86. Acylindricalhelicalspring 81 having :a;,dia1 neter greater than thatof-ring 84 is. secur.e .as eld n tQn nd.- o the ring 84. The opposite end of the spring 81 is welded to the periphery of a perforated annular plate or washer member 88 and positions the latter so that the opening 83 therethrough is disposed axially aligned with cutting tool I5 to permit the passage of the cutting edges thereof. The washer 88 is adapted to lie upon the upper surface of the work piece in surrounding relationship to the area thereof which is to be perforated and is of value in preventing marring or scratching of the skin surface by drill chips created in the drilling operation. The cylindrical spring also has a tendency to prevent the drill chips from flying freely about. The coils of the spring 81 present themselves in the path of the drill chips and will block or hinder the passage of most of the chips and confine them to the area defined by the diameter of the spring 81. Two pairs of diametrically opposed projections SI extend from the lower end 92 of the ring 84 toward the washer 88 and, upon downward movement of housing i, are engageable with the upper surface thereof to constitute stop means which assist in determining the advance to be made by the cutting tool in the perforating operation, as will be described.
Operative connection of the gaging means 83, to the gear housing 5| is afforded by an externally threaded annular flange or collar portion 93 provided depending from lower body portion 53 and encircling the cutting tool 15. Ring 84 by reason of its threaded engagement with collar 33 can be axially moved thereupon in either direction to adjust the position of gaging means 83 relative to the cutting tool I5 and thereby determine the amount of movement available to the cutting tool '15. The outer periphery of the ring 84 is preferably knurled for ready gripping and easy manual movement. A leaf spring 94, secured at one end, as by welding, to the exterior surface of lower body portion 53 projects therefrom to position its free end 95 between two adjacent upstanding teeth 86 so that teeth 86 and free spring end 95 cooperate to effect an indexing means. The leaf spring 94 exerts its bias to hold the free end 95 thereof normally between two teeth with sufficient force that the ring 84 will be effectively maintained in the desired adjusted position on collar 93 and inadvertent movement thereof is avoided. Manual rotation of the ring 84 to change the amount of advance of the cutting tool 15 will force the free spring end 95 out from between its rest between adjacent teeth and when the ring 84 has been adjusted to a desired position the spring end 95 will snap into position between a pair of teeth to lock the ring 84 in place. 7
The drill unit 2I is held in operative position on machine H) by the swingable supporting arm 22. The supporting arm 22 is formed with a compression collar 96 at its lower end which is adapted to fit over and encircle an annular flange 51 upwardly extending from upper body portion 52 of gear housing 5!. A screw, not shown, is provided on the compression collar 96 to effect tightening thereof upon the flange 91 whereby the housing BI is rigidly aifixed to supporting arm 22. An externally threaded adapter 08 is removably fitted into a threaded bore 99 prc,
vided in annular flange 9'! and lies in axial alignment with cutting tool I5. The adapter 98 has a recess IOI in its upper end which receives the end of the reciprocating plunger-rivet set Il which carries the drill unit 2| into operative position upon the work piece. The entrance to the recess IOI is chamfered, as shown, for easy access of plunger IT. The adapter serves, in addition to connecting the plunger I! and the drill unit 2| for common movement, to maintain concentricity and alignment of the cutting tool I5 and the locating device of the anvil assembly I8, to be described.
To drive the cutting tool I5 there is provided an air motor I02 operatively connected to the gear train 59 through a drive shaft assembly N13. The drive shaft assembly I03 comprises a tubular member I04 into which is telescoped, for slidable movement, a rod element I05. The tubular member I04 is connected to a rotatable drive shaft I06 provided by the air motor I02 by means of a universal joint I01 whereby ro tative movement can be provided to the drive shaft assembly I03. The rod element I05 is joined to the gear train 59 through the medium of a second universal joint I08, as best shown in Figure 9. The universal joint I08 comprises a body portion I09, suitably secured to the end of rod I05, having spaced, downwardly extending arm portions III. A second body portion II2, having an internally threaded socket II3 provided therein and spaced upstanding arm portions H4 at its upper end which lie disposed adjacent the arm portions I I I and at right angles thereto. A pivot pin H5 is carried by spaced arms H4 and extends therebetween. A second pivot pin II6 supported by the spaced arms III is adapted to extend through an opening (not shown) in the pivot pin II5 to effect thereby a pivotal connection between the two body portions I09 and H2. A spacer 1, formed of metallic material such as steel, is disposed in the area between the pairs of spaced arms III and H4. The pivot pins H5 and H6 are passed through spacer II! which serves to prevent slippage between the pins.
One end of shaft 64 of drive gear BI extends through an opening in the top of upper body portion 52 and carries external threads thereon, as indicated at II8. This threaded end II8 is adapted to fit into internally threaded socket I I3 to complete the connection between the drive shaft assembly I53 and the gear train 59. Universal joint I0! embodies a similar pivotal arrangement as is incorporated in universal joint I08 and effects an operative connection between the tubular member I04 and the rotatable air motor drive shaft I06 to provide rotative movement of the drive shaft assembly I03. This rotative movement of drive shaft assembly I03 causes shaft 64 to rotateto drive its gear GI, which actuates idler gear 62, the latter in turn actuating driving gear 63 to rotate the cutting tool I5, carried by shaft ll, to enable it to perform the perforating operation when brought to the work piece.
The air motor I02 which actuates drive shaft assembly I03 is of conventional construction, and comprises, as best shown in Figure 10, a casing I2I having a usual air vane assembly I22 suitably supported therein for rotative movement when air under pressure is introduced into the casing I2I. The air vane assembly I22 is suitably connected through a usual reduction gear arrangement I23 to actuate the drive shaft I06 which is connected by universal joint I01 to the drive shaft assembly I03. A valve assembly I24, best illustrated in Figure 10, is provided for controlling the feeding of air to the casing I2I to run air motor I02. Valve assembly 124 comprises a housing I25 afiixed to the exterior of casing IZI as by welding, with communication between the interior of housing I2I and housing I being afforded by a tubular member I25. An adapter I21 is threaded into the top wall of housing I25, extends the lengththereof, and has a longitudinal air passage I28 provided therein. Passageways I3I interconnect the air passage I28 with the interior of housing I25. A ball bearing valve I32 is confined for movement in air passage I28 and is adapted to seat on a shoulder I 33 formed adjacent the lower end of air passage I28 to close communication between air passage I28 and the interior of housing I25. An L-shaped fitting I34 is threaded into the upper end of air passage I23 and connects through an air lead I35 to air line to provide the air needed for operation of the air motor I02. Pressure of the air conducted by air lead I35 to air passage I28 acts to hold the ball bearing valve I32 normally in seated position on its cooperating shoulder I33. To move valve I32 to unseated position to establish free passage of the air to the air motor I 62 there is afforded a valve pin I35slidably mounted in the lower end of adapter I21 with its upper end normally positioned below and-spaced from the ball bearing valve I32 and its opposite end projected to the exterior of valve housing I25 and resting upon the upper end of an actuating reciprocable plunger I 31 slidably positioned within a vertical bore I33 formed in a mounting bracket I4I. A threaded fitting I42 is located in the lower end of bore I38 and is connected to an air lead I43 whereby air pressure may be applied to the bottom of actuating plunger I31 to effect longitudinal movement upwardly of the plunger I31 to actuate valve pin I36 to unseat valve I32. The detailed construction of air motor I02 and valve assembly I24 constitutes no part of the present invention and the construction illustrated in the drawings is understood only to be representative of valve controlled air powered devices that could be employed in this invention.
The air motor I52 is supported in operative position on machine ID by the mounting bracket I4I which is afiixed to the outer wall of the air cylinder 3I by a plurality of suitable fasteners I351. The mounting bracket I4I is provided adjacent its one end I46 with a vertical bore I44 into which a portion of the casing I2 I of air motor I62 is tightly fitted to mount the air motor I32 in operative position. Horizontally spaced from bore I44 is the vertical bore I33 in which is slidably mounted the longitudinally movable actuating plunger I31 which moves valve pin I36. The opposite end I45 of the mounting bracket MI is adapted to accommodate a valve arrangement I45. Valve arrangement I46 comprises an adapter I41 having a threaded engagement with the defining walls of the upper end of a vertical bore I 48 formed in the mounting bracket Hill. The adapter I41 extends from the top to the bottom of bracket I4! and is provided with a longitudinal bore I'5I communicating by way of passages I52 with bore I43.
'A fitting assembly I53 is mounted in the upper end of longitudinal bore I5I and is connected through an air lead I54 with the air lead 45 to provide a path whereby air may be conducted to bore IESI. The fitting assembly 553 includes a usual pet cock I 55 which permits closure of the air passage through the fitting assembly I53 when desired. A ball valve E55 is disposed for movement within longitudinal bore I5I and has 10 a valve'seat I51 formed in the'bore I'5I adjacent the passages I52. The pressure of the air introduced within longitudinal bore I5I is adapted normally to position the valve I56 in its seated position to prevent air passing from bore I5I- through passages I52 into vertical'bore I48. A- valve pin I58 is slidably positioned at the lower end of adapter I41 and is movable into engage ment with valve I56 to effect-unseating thereof. Movement of valve pin I58 is effected and controlled by a cam actuator I 6| to be described. With valve I56 in open position air will freely pass into vertical bore I48 from which it-escapes by Way of a usual hose fitting I62. Hose fitting I62, asbest seen in Figure 2, is located at end I45 of mounting bracket I4I. It is adapted to communicate with bore I46 through a port (not shown) in the wall of the mounting bracket. A T-coupling I63 connects hose fitting I62 to the air lead I43,- which air lead effects operation of the actuating plunger I31-for'valve assembly I24. The T-coupling I63 also connects to the one end of an air lead I54 whose opposite end isfitted to a tubular element I 65 mounted on and projecting laterally from upper body portion "52 of gear housing 5I. As seen in Figure 8, the tubular element I65 is disposed on body portion 52" so as to locate the bore I66 thereof aligned with the entrance to an arcuate passage I61. This passage I61 empties by way of a'connecting passage I68 into the space defined by the interior wall surfaces of annular flange 33, which flange 93 depends from lower body portion 53; The air provided to this space is adapted to be'directed at the area of the work-piece being drilled by cutting tool 15 and serves to blow the chips formed in the perforating operation away from the tool 15. It is here noted that when air is passed by valve I56 to the'hose fitting I62, such air is directed simultaneously to. both the air leads I43 and I64. The purpose of air lead I43 is to provide the-pressure necessary to move actuating plunger I31 upwardly to unseat valve I32 thereby to discharge air into casing I2I of air motor I52, for the operation of itsair vanes I22 to rotate drive shaft assembly I03 and thereby actuate cutting tool 15. The air fedthrough the second air conduit I64 will play upon cutting tool 15 throughout its period of drilling operation and until valve pin I53 permits re-seating of valve I 56 to block further passing of' air to the two air lines I43 and I64.
As described hereinbefore the air cylinder 3! through reciprocal movement of its piston 32 effects reciprocal movement of the plunger I1. Plunger I1 is adapted to bottom in recess IIII of adapter 38 to move the drilling unit 2| to the work-piece. Washer 36 provided by gaging means 83 of drilling unit 2I will contact the work-piece first and rotating cutting tool 15 will follow, passing through the central opening 89 in washer 33 to perforate the work piece. The gaging means 83 determines the depth of the opening and of the countersink to be formed in the work piece. Engagement of the washer 68 by the opposed pairs of legs 3i projecting from the lower end of ring 64 determines the amount of advance of the cutting tool 15 into the workpiece; zith this engagement any further movement a; the housing 51 carrying the cutting tool 15 in the direction of the work piece is halted. Application of excessive downwardly directed pressure by piston 32 and plunger I1 upon housing 5! of drilling unit 2i after the depending legs 5-H have contacted the washer 38 11 is prevented by the provision of a piston stop assembly I69 operatively supported within the air cylinder 3!. Piston stop assembly I69, as best seen in Figure 4, comprises a pivotally mounted plate member I'IB movable between a horizontal, or inactive position, and a vertical, or piston stopping, position. Piston 32 when forced down by air pressure is adapted to engage with the upraised plate member I'IB whereupon its further downward movement is prevented. A reciprocating linkage assembly III is operatively connected to the pivotal plate member I for effecting movement thereof. The reciprocating linkage assembly III is operated by a rotatable shaft I'I'2 which is driven by an actuator assembly I13 to be described. However, even though its advance is stopped, the cutting tool I5 will continue to rotate. To conclude this rotating action of the cutting tool I5 and to return the drilling unit 2I to inoperative position there is provided a conventional self-contained, normally open, snap switch assembly I'M, of the microswitch type. The switch assembly I14 is mounted upon an extension I15 of the upper body portion 52 of housing 5!. assembly H4 is provided with an externally threaded projection I'IE which is fitted through an opening IT! in extension I15 and receives a nut I18 which serves to fasten the switch assembly IIII securely to the housing 5I. I79 provided for operating switch assembly I'M projects below extension I15 and carries an elongated supporting member IBI transversely disposed and underlying extension I15. Elongated member I8I mounts a stud I82 which is threaded therethrough, and which has its shank I83 disposed for free slidable movement within an opening I84 in extension I15 and has its lower end I85 disposed spaced from the transverse elongated member ISI. It is seen that as housing 5| of the drilling unit 2| is carried toward the work piece the switch assembly I14 supported by it and the upstanding stud I82 supported by the switch actuator I79 are also moved in the same direction. This movement will bring the lower end I85 of the stud I82 into engagement with the surface of the work piece. Stud I82 will thereupon exert force upon the transverse member I8I to move it upwardly away from the surface of the work piece. This movement will be transmitted to the switch actuator I'I9 to cause it to move to operate switch II I. Switch I'M is suitably electrically connected to electric means, not shown, associated with the shift cylinder assembly 43 to cause it to function so as to bleed the main control valve 1 and exhaust air cylinder 3|, whereupon piston 32 is returned to its rest position under the bias of compression spring 35, and plunger I'I withdraws from the adapter 93. With release of the pressure of plunger I'I therefrom the drilling unit 2I will be carried upwardly away from the work piece by support arm 22 and its shaft 23, the shaft 23 moving upwardly under spring bias. Stud I32 by reason of its threaded connection with extension II5 can be readily rotated to adjust the position of its lower end I85 and thus change the time of actuation of switch I'M as desired.
The shift cylinder assembly 43 functions also to operate the cam actuator IEI, as will be described in further detail, to cause valve I to close and disconnect the air lead I64 from the air supply whereupon the air motor I02 ceases to function and the cutting tool I5 stops rotating.
As stated hereinbefore valve I56 which con- The casing of switch An actuator trols the feeding of air used to drive air motor I02 and to blow chips away from the cutting tool I5 is itself controlled by a cam actuator I6I, whose construction is best illustrated in Figures 12 and 13. Cam actuator I6I comprises a generally U-shaped member I86 comprising spaced legs I81 and having an outwardly projecting generally arcuate portion I88 located adjacent the bight I89 thereof. The projecting portion I88 has an inclined surface I9! formed thereon upon which the lower end of valve pin I58 rests. It is apparent that as cam actuator IBI is oscillated to shift the position of inclined surface I9I relative to the valve pin I58 the latter is made to ride up and down this inclined surface and will be given a reciprocating movement toward and away the ball bearing valve IE6. Pin I58 will displace valve I56 from its seat I5! when raised high enough to engage valve I58, and will permit valve I56 to assume its seated position when the inclined surface ISI moves in a direction to permit pin I58 to fall in its bore to lie spaced from the valve I55.
Oscillating movement of cam actuator I6I to effect reciprocation of valve pin I58 is obtained through an elongated member I32, a portion of which lies disposed between the legs I8! of cam actuator I6I and is secured thereto by a number of studs I93. The elongated member I92 is pivotally joined, at its end I911 by a pivot pin I95 to a clevis I96 provided at the exterior end of a reciprocating connecting rod I97. The connecting rod I9? is suitably attached to the pulley and cable arrangement 44 controlled by the shaft cylinder assembly 43 and through which cable and pulley arrangement 65 reciprocating action of the connecting rod I91 is obtained.
Adjacent embraced end I98 of the elongated member I92 is provided an opening I99 into which is tightly fitted the lower end 280 of the shaft I'I2. Shaft I12, as stated hereinbefore, is operatively connected to the reciprocating linkage assembly III in air cylinder IN to actuate piston stop plate member IIU between its horizontal and vertical positions.
Provided substantially centrally in elongated member I92 is a second opening Zill into which is adapted to project the free end 282 of an oscillating member 283, whose opposite end is suitably rotatably mounted. Free end 292 fitting into opening 2IlI effects a pivotal connection between elongated member I92 and oscillating member 283. With the construction described the elongated member I92 upon having its end I94 actuated by reciprocating rod I91 will, through its opposite end I98, rotate shaft I'I2 to operate reciprocating linkage III to raise and lower the piston stop plate member I10 and will oscillate cam actuator IEI to shift the position of inclined surface I9I on cam actuator IBI to effect reciprocating movement of valve pin I58. The movement of valve pin I58 riding on cam actuator I6 is coordinated with the movement of the piston stop plate member I10 by means of elongated member I92 and cam actuator I6I. Valve pin I58 will be actuated by inclined surface I91 of cam actuator IBI into valve opening position as shaft IIZ affixed to cam actuator I6I rotates to operate reciprocating linkage III to raise plate member I10 into piston stopping position, and valve pin I58 will rest in its inactive position on inclined surface I9I at the time that plate member I'ID assumes a horizontal position.
In the formation of rivet holes by drilling in metal sheets brought adjacent one another there 13 exists a. likelihood that dust particles and fine chips created by the drill may sift between. the sheets and hold. the adjacent surfaces thereof out of contact with one another and thereby tend to prevent the obtainment of a fully effective riveted joint. The present invention provides an attachment for use with machine it which functions to maintain the work parts in desired close engagement as they are being perforated and riveted. This attachment comprises, as best illustrated in Figures 16 and 17, a hold-downassembly 295 which includes an elongated clamping member 2535 bent to effect an obtuse angle defined by a portion Zill inclined to a portion 208. The inclined portion. 2% is pivotally connected, at its end 239, by a pivot pin 2, to a bracket 212 which is securely fastened by studs M3 to the underface of yoke jaw 13. To effect pivotal movement of clamping member 2'33 there isprovided a conventional air cylinder 2M which is mounted upon the underface of yoke jaw l3 by studs 225. The air cylinder 264 includes a usual reciprocab-l'e piston (not shown) which. actuates a piston rod 2H5, the end of which projects from the bottom of the cylinder 2H3. The piston rod 216 has a lost motion connection with portion 2528 of the clamping member 295', which lost motion connection is efiected by a stud 2 i '2' whose shank is passed through a slotted opening 213,
provided in portion 238 of elongated member 296,
and threaded into the bottom end of piston rod 2E6. An air conduit 220, connected at one end to air cylinder 2M and at the other to" air lead M, provides the power for operation of air cylinder 2! to move the .piston rod 2H3 to actuate the clamping member 2% and press portion 293 thereof tightly against the upper surface of the work to hold the-two adjacent pieces of material comprising the work in firm engagement during the perforating and riveting operations. The hold down assembly 2655- is located adjacent plunger ll andis movable in the same plane as is plunger l? to clamp the work piece in the area immediately surrounding the spot to be perforated and riveted.
Portion 233' of pivc" d clamping member 7266 has its outer end 2% formed generally into a U-shape comprising two legs 22% and-2E2 spaced apart, with leg 22? being of a smaller length than opposite leg 222. legs 22!. 222, to lie disposed on opposite sides of plunger ii. These legs 22? and 222* lie .positioned on opposite sides of the cutting tool lE-and its associated gage means 83 when the drilling unit is moved into position for engagement and actuation by plunger 6?. The disparity in length of legs 221 and 222is necessary to-prevent interference with the swinging movement of the drilling unit El to and from its position beneath plunger. it. The projection of shorter: leg 22! would-liein the path of movement of cutting tool l5. Having a shorter length provided for leg 225 permits the drilling unit 2% to swing freely past the end thereof. Rivet shoe 2 2 is normally so positioned that it lies disposed above the longer leg 222 and therefore when swinging into. and out of position for cooperation. with plunger I? it passes over leg 222 without interference being offered to its freedom oi'movement by leg 222.
The cylinder is provided with a laterally projecting he ge flts'adjacent its lower end. An adjusting stu'o .1? is threadedinto flange 223 and extends to either side thereof. Stud'224 carriesa look nut 225.011 one side to fix theposition of thestud 22s,; and has one end: adapted to. en
Clamping member projects I4 gage portion 298 of clamping membenZtli- The stud 225 permits adjustment of the position of portion 289 relativeto air cylinder 214. 1
The anvil assembly i8: supports the work piece 28. as it is being perforated and riveted. It is of conventional construction, and, as seen in Figure 1 comprises a frame 2-28 carryinga usual anvil support 221 The anvil supp'ort'22'l mounts a reciprocable generally U-shaped stripper saddle memberZZil havingspaced'legs 229 and 23llwhich are disposed within cylinders 23!, shown in dotted outline, provided by frame 226 and anvil support 22?. Air is provided to these cylinders 23! by a: lead 232 extending frcmregulator valve 46; This air is adapted to act upon the bottom surfacesof legs 22s and 288 to move thestrippersaddle member 223' into its upper position as shown in Figure 14'.
An air lead 233v is connected at one end; as illustrated in Figure 15', to bight 234 of thestripper saddle member 223 to provide air to achamher 235 located in the bight 234, which air is used for blowing away drill chips formed during the perforating operation aswill be fu-rtherdescribed Air lead is connected at its other end. to. air lead ll from which it obtainsthe air which is supplied to chamber 235.
An anvil post 236 is suitably mounted by anvil support 22! and projects upwardly therefrom to extend into a bore 23-1 provided in a reciprocably movable work supporting stripper member 238 to guide the latter in its movements" and to serve to head the rivets. Stripper member 238 rests its lower end 239' upon the top of stripper saddle member 228 and is bodily movable there'- with relative to anvil post 236 during the riveting operation. The purpose of the stripper is to support the work piece as it is being operated upon. It will hold the work piece spaced from the top of anvil post 236'in order that the shank of a rivet may extend through the workiprior to being headed. Air pressure normally is continuously provided by regulator valve 48* through air lead 232 to the cylinders 23'! to act onlegs- 229 and 230 of the stripper saddle 228 to'raisethe stripper member 238' to the position shown in Figure M to hold it inproper relationship to the drilling unit 2i and rivet shoe 24. In. the performance of the riveting operation the pressure provided upon the upper surface of work piece 28 by rivet shoe 24 and top set or plunger I! will cause the stripper member 238 to move downwardly and relative to the anvil post 235.
Stripper member 238 has a vertical bore 242 providedtherein which connects its upper surface with air chamber 235-where-by air can be'led'from the chamber 235 to exit at the bottom of the workpiece rested onstripper member 238' to blow away any drill chips whichiappear upon the work supporting stripper member 238. Slidably positioned within a through bore 244 in" anvil post 236' and extending. downwardly into an aligned bore 245- in anvil support 221 is a locating pin member 246, a slidably movable adapter 253'upon the upper end of which pin member 245" rests, and a stop member 25! having abore 25lltherein. A spring 241 is disposedwithin stop member bore 250 and acts upon the-lower end of locating pi'n member 246, exerting its bias thereupon-normal- 1y tor projectthe upper end zlisthereof abovethe top of anvil. post 23-6 and. above the stripper member- 238. The upper end 248 of pin member 246 will lie spaced from the'topof anvil. post 236 and stripper member 238 untilxengaged and forced downwardly either b'y the unde'r surface of a work piece or by the end of a rivet shank. The locating pin member 246 is positioned and held by anvil post 236 in axial alignment with cutting tool 15 and therefore, after the completion of a drilling operation and the withdrawal of the cutting tool 15 from the rivet hole formed thereby, the locating pin 246 will be moved upwardly by its spring 241 to extend into the rivet hole and thereby hold the perforated work piece in position until a rivet shank is inserted into the rivet hole by the plunger operated rivet shoe 24. The rivet shank will press the locating pin member 246 downwardly until the top of the pin member 246 lies in the plane of the top of anvil post 236, at which point a shoulder 249 on the adapter 253 engages the upper end of stop member to halt further longitudinal downward movement of locating pin 246. Pin 246 then cooperates with anvil post 236 to effect an anvil upon which the rivet shank is headed as additional pressure is applied to the head of the rivet by plunger I1.
The anvil assembly I8 may be bodily raised to and lowered from its operative position by a mechanism, not shown, housed within frame 226, which mechanism is operated by air pressure provided through air leads 252 and controlled by appropriate pedals 39 on foot operated control member 31. Provision is made for raising and lowering the anvil assembly I8 to more readily permit placement of a work piece in proper position between the yoke jaws.
In the operation of the invention a work piece 28 will be placed upon the stripper member 238 of anvil assembly I8 to rest it in position for perforation and riveting. A pedal 39 on the foot operated member 31 is then actuated to by-pass air from air supply conduit 38 to the air lead 4 I. This air actuates the shift cylinder assembly 43, which in turn actuates the cable and pulley arrangement 44. The cable and pulley arrangement 44 operates the master control valve 41 to pass air from air conduit 45 through air line 56 into the air cylinder 3| to build up pressure therein to effect downward movement of piston 32 against the bias of spring 35.
The operation of cable and pulley arrangement 44 withdraws reciprocating rod I91 into the upper jaw I3. Clevis I96 on the end of reciprocating rod I81 thereupon moves end I94 of elongated member I92 to effect rotative or arcuate movement of the opposite end I98 thereof about the connection of free end 202 of oscillating member 283 and the elongated member I92. This movement of end |98 will rotate shaft I12 to operate the linkage assembly |1| to raise the piston stop assembly I69 provided within air cylinder 3|. The arcuate movement of end I98 of elongated member I92 will also move the cam actuator I6| to displace its inclined surface |9| relative to the valve pin I58 to cause the latter to ride up this inclined surface |9I and thereby move upwardly within bore |5I of valve adapter I41 to engage ball bearing valve I56 to unseat it. The unseating of valve I56 allows air to pass from lead I54 and lead 45 through the passages l52 to issue through hose fitting I62. From hose fitting I62 this air takes two paths, along one path it is conducted by air lead I64 to the gear housing 5| to discharge through communicating passages I66, I61 and I68 into the space defined by annular flange 93 whereby a blast of air is provided at the cutting tool 15. The second path from the hose fitting I62 is by way of the air lead |43which connects to hosefittlng I42 and discharges against the bottom surface of reciprocable plunger I31 to apply pressure thereagainst for moving it upwardly, longitudinally, within its bore I38. Upward movement of plunger I31 will move valve pin I36 in the same direction to bring the latter into engagement with ball bearing valve 32 to move valve I32 off its seat I33. Valve I32 controls the feeding of air required for operation of the air motor I32. This air i taken from air supply line 38 by way of air leads 45 and I35 and is passed to bore I28 in adapter |21. Unseating of valve |32 by valve pin I36 allows the air to flow from bore I28 through passages I31 and tubular member I26 to act upon vane assembly I22 to effect rotation thereof. Vane assembly I22 drives shaft I66 which in turn rotates drive shaft assembly I03. Rotation of drive shaft assembly I63 will actuate gear train 59 to rotate the cutting tool 15. Thus the movement of cam actuator |6| to actuate valve pin I58 results in the actuation of air motor I02 to effect rotation of cutting tool 15 and in the provision of an air blast at the cutting tool 15.
As the pressure in air cylinder 3| builds up the piston 32 is moved downwardly to move plunger I1 into engagement with adapter 98 carried by gear housing 5| of drilling unit 2|. Continued downward movement of plunger I1 moves the drilling unit 2| toward the Work piece 28 to bring the cutting tool 15 upon the work piece 28. The time required to build up the necessary pressure within air cylinder 3| to move piston 32 and plunger H to perform their function is such that the cutting tool 15 is rotating at its maximum speed before the work piece is contacted. This obviously results in a more efiicient cutting operation and applies less strain to the operating elements. Also before the cutting tool 15 begins the cutting operation the hold-down assembly 265 will have operated to apply a clamping pressure upon the upper surface of the work piece 28. When air is admitted to line 4| to actuate shift cylinder assembly 46 it will also enter air line 220 which is connected to line 4!. Air line 220 will pass this air to air cylinder 2|4 of the holddown assembly 265. On introduction of air into air cylinder 2I4 its piston rod 2|6 is actuated downwardly to effect pivotal movement of clamping member 206 to carry the U-shaped end of portion 268 into engagement with the upper surface of work piece 28. The pressure applied by clamping member 263 will efficiently hold the adjacent parts comprising the work piece tightly in engagement prior to and during the drilling operation.
- After the cutting tool 15 has cut an opening and counter-sink in the work piece 28 to the depth determined by the gage means 83 the lower end I85 of stud I82 engages the upper surfaceof the work piece 23 to effect upward movement of switch actuator I13 to operate the normally open snap switch I14. Switch I14 on being operated actuates the shift cylinder assembly 43 to exhaust it and cause it to act through the cable and pulley arrangement 44 to bleed the master control valve 51 to exhaust air cylinder 3| to permit the return of piston 32 to its upper position. Upward movement of piston 32 withdraws plunger I1 from engagement with drilling unit 2|. Upon release of the pressure of plunger I1 shaft 23, which mounts support arm 22 and driling unit 2 I, moves upwardly in the same direction as plunger I1 to space drilling unit 2| above the work piece 28. This upward movement of drilling unit 2| withdraws cutting tool absence from the rivet hole cut by it. As cutting tool 15 withdraws from the rivet hole the upper end 248 of locating pin member 246 is projected into the rivet hole to hold the work piece in position for the riveting operation. Exhausting the shift cylinder assembly 43 will effect exhausting of air cyinder 214 of hold-down assembly 205 through air line 220. Piston rod2I6 will withdraw into air cylinder 2I4 to rotate clamping member 206 away from the work piece 28 and release it from clamping pressure. The perforating operation is now complete.
In the riveting operation a pedal 39 on the foot controlled member 36 is pressed to feed air through line 42 to again actuate the shift cylinder assembly 43 which again operates the cable and pulley arrangement 44. Cable and pulley arrangement 44 actuates the appropriate linkage for effecting pivotal movement, in unison, of the support arms 22 and to provide a substitution in-position of the drilling unit -2I and the rivet shoe '24, mov ing'drilling unit 2| out from under plunger I 1 and replacing it with rivet shoe 24. i
Reciprocating connecting rod I91 will be projected forwardly to move clevis I96 and rotate the end I98 of elongated member 192 about the connection of elongated member I32 with the free end 2-02 of oscillating member 203. Rotative movement causes rotation of shaft H2 which opcrates linkage assembly I'll to move piston stop plate member I69 to its lowered position. Rotative movement of end I98- of elongated member I-92 also moves the cam actuator ISI to displace its inclined surface I 3-I relative to the valve pin I58 to cause thelatter to fall so as to disengage from ball bearing valve I56. Valve I56 will then bemoved by air pressure, provided through air leads and I54, to rest on valve seat 15! and thereby out off the air supply to hose fitting I62. Air leads I43 and -IE4 connected to hose fitting I62 will then be shut off. With air lead 143 closed off there is no pressure available to hold.
plunger I3 1 in its upper position. Plunger I31 will therefore fall downwardly and valve pin 1'36 actuated .by plunger I31 will move in the same direction to disengage the ballbearing valve -.I 32. Valve I32 will be :moved by air pressure to seat on shoulder I 33 .tozdiscontinue the feeding of air from .air lines 135 and 45 to the air motor I32. Air motor 182 will then cease to function and rotation of drive shaft assembly VI (93 willbehalted. Gear train 59 .willstop and :the cutting .tool .15 will come torest. :With no air being provided to "hose fitting I62 the air blast provided at the cutting tool =15 through air :lead 164 is discontlnued.
The cable and pulley arrangement 44. actuated by shift cylinder assembly 46 operatesmain valve 41 to pass .air to the air cylinder 3| to effect movement of piston '32 therein. Plunger I! will be moved bypiston 32 to-engage rivet shoe .24to carry it, and the rivet disposed -therein, to the work piece to dispose the shank of-the rivet in the rivet Thole formed in (the drilling operation. Plunger l1 and piston 32 will continue ---their downward movementunderthe forceof thepressure-built upin aircylinder 3'I until the shank of the rivet is headed by theanvil assembly I8. After the riveting operation the removal of pressure from the lastactuated foot pedal 39 on foot operated control member-37 shuts off air to shift cylinder assembly 43. Shift cylinder assembly 43 will then bleed and effect actuation of :the cableand pulley arrangement 44 to operate main control valve 4-! to bleed it and eiiect exhaustion of the air from air cylinder 3| to return plunger I1 to its neutral position and disengage it'from the rivet shoe 24. The work piece 28 is then shifted to a new position on anvil assembly 18 and the drilling and riveting cycle above described is repeated.
While certain preferred embodiments of the invention have been specifically disclosed, it is understood that the invention is not limited thereto as many variations will be readily apparent to those skilled in the art and the invention is to be given its broadest possible interpretation within the terms of the following claims.
What Iclaim is:
1. In a riveting machinehaving a pair of mutually. opposed jaws with .a workpiece supporting anvilgassembly mounted upon one jaw and a drilling assembly and a rivet holding member, each supported for swinging movement uponlthe opposite jaw adapted to be alternately positioned over said anvil assembly and alternately movable into engagement with a work piece to be perforated and riveted, said drilling assembly comprising a rotary cutting tool and drive means operatively connectedto said rotary cutting tool for rotating it, clamping means operatively mounted on said jaw which supports said drilling assembly and said rivet holding member-adaptedto move toward the anvil assembly supporting jaw tocontact and press upon the work piece prior to and during perforation thereof by the rotary' cutting tool, said clampingmeans comprising an elongated member having one end pivotally "secured tothe jaw supporting the drilling assembly, anaircylinder having a piston movable toward and away from the work piece, and means effecting a lost motion connection betweenthe piston and said elongated member whereby said elongated member is movable to the work piece tob'ring its free end into clamping engagement therewith, and a locating pin member slidably "supported by said anvil a'ssemblyadapted to move into an opening cut into the work piece upon withdrawal of the rotary cutting tool and the elongated me ber therefrom.
2. In a riveting machinehaving a frame with a pair of spaced apart arms, a work piece supporting assembly provided.upon one arm,"a drilling attachment movably mounted onthe opposed arm adapted to be advanced and retracted rel ative-to a work piece to beperforated, saididriiling attachment comprising a housing, a [cutting tool rotatively supportedby said housing, ageartrain carried by said housing operatively connected to said cutting tool forrotating it, means for actuating said'gear train to rotate said cutting tool before its en agement with awork piece, said means comprising motor driven means having fa connection with the gear trim for actuation thereof, gage means supportedinfassociation with said housing and operativ to "determine the depth of perforation of 'the work pie-c by the cutting tool, said isage means comprisinga ring member movablyniounted' "on said housing "in encircling relationship to-the cutting tool, and means for providingan airblast 'atth cutting tool effective to ;blow away dust' particles created by the cutting tool-in perforating the' work piece, said means comprising a tubular member supported bysaid housing having a connection with a source ofair supply,said-ho'using having passages therein interconnecting said tubularelement and the area defined by the ring; member, into whicharea air may be passed I w actoKthe' 19 area of the work piece being perforated by the cutting tool.
3. In a riveting machine having a pair of mutually opposed jaws, one disposed above the other, with a work piece supporting assembly mounted upon the lower jaw and a drilling assembly and a rivet holding member movably supported in association with the upper jaw, said drilling assembly and rivet holding member adapted alternately to advance to and withdraw from a work piece to be perforated and riveted, said drilling assembly comprising a housing, a cutting tool rotatively supported by said housing, and a gear train carried by said housing operatively connected to said cutting tool for rotating it, a motor mounted on said upper jaw, a drive shaft assembly operatively interconnecting said motor and said gear train, means for operating said motor to effect actuation of said drive shaft assembly and said gear train prior to said cutting tool engaging the work piece, said drive shaft assembly comprising telescopic means, a universal joint connecting one end of said telescopic means to said motor, and a second universal joint connecting the opposite end of said telescopic means to said gear train, and clamping means operatively mounted on the upper jaw adapted to contact and press upon the work piece prior to perforation thereof by the cutting tool.
4. In a riveting machine having a frame with a pair of spaced arms, one disposed above the other, with a work piece supporting assembly mounted upon the lower arm and a drilling assembly and a rivet holding member movably supported in association with the upper arm, said drilling assembly and rivet holding member adapted alternately to advance to and withdraw from a work piece to be perforated and riveted, said drilling assembly comprising a housing, a cutting tool rotatively supported by said housing, a gear train carried by said housing operatively connected to said cutting tool for rotating it and means for providing an air blast at the cutting tool effective to blow away dust particles created by the cutting tool in perforating the work piece, said means comprising an air lead-in member supported by the housing adapted to communicate with passages provided by said housing, which passages direct air to the area of the work piece being perforated by the cutting tool, an air motor mounted on said upper jaw, a drive shaft assembly operatively interconnecting said air motor and said gear train, valve means for controlling the feeding of air to said air blast means and to said air motor, means for actuating said valve means to feed air to said air motor to effect operation of said cutting tool prior to its engaging the work piece, and clamping means operatively mounted on the upper jaw adapted to contact and press upon the work piece prior to perforation thereof by the cutting tool.
5. In a riveting machine having a pair of mutually opposed jaws, one disposed above the other, with a work piece supporting assembly mounted upon the lower jaw and a drilling assembly and a rivet holding member movably supported in association with the upper jaw, said drilling assembly and rivet holding member adapted alternately to advance into and withdraw from a work piece to be perforated and riveted, said drilling assembly comprising a housing, a cutting tool rotatively supported by said housing, a gear train carried by said housing operatively connected to said cutting tool for rotating it, and means for providing an air blast at the cutting tool effective to blow away dust particles created by the cutting tool in perforating the work piece, said means comprising an air lead-in member supported by the housing adapted to communicate with passages provided by said housing, which passages direct air to the area of the work piece being perforated by the cutting tool, an air motor mounted on said upper jaw, a drive shaft assembly operatively interconnecting said motor and said gear train for actuating said gear train prior to said cutting tool engaging the work piece, said drive shaft assembly comprising telescopic means, a universal joint connecting one end of said telescopic means to said motor, and a second universal joint connecting the opposite end of said telescopic means to said gear train, valve means mounted on said frame for controlling the feeding of air to said air blast means and to said air motor, means for actuating said valve means to feed air to said air motor to effect operation of said cutting tool prior to its engaging the work piece, and clamping means operatively mounted on the upper jaw adapted to contact and press upon-the work piece prior to perforation thereof by the cutting tool.
6. In a riveting machine having a frame with a pair of spaced apart arms, one disposed above the other, a work piece supporting assembly provided upon the lower arm, a drilling attachment movably mounted on the upper arm adapted to be advanced and retracted relative to a work piece to be perforated, said drilling attachment comprising a housing, a cutting tool rotatively supported by said housing, a gear train carried by said housing operatively connected to said cutting tool for rotating it, means for actuating said gear train to rotate said cutting tool before its engagement with a work piece, said means comprising motor driven means having a connection with the gear train for actuation thereof, gage means supported in association with said housing and operative to determine the depth of perforation of the work piece by the cutting tool, said gage means comprising a ring member movably mounted on said housing in encircling relationship to the cutting tool, means for providing an air blast at the cutting tool effective to blow away dust particles created by the cutting tool in perforating the work piece, said means comprising an air lead-in member supported by the housing, said housing having passages therein interconnecting said air lead-in member and the area defined by the ring member, into which area air may be passed to act upon the area of the work piece being perforated by the cutting tool,
and clamping means operatively mounted on the upper arm adapted to contact and press upon the work piece prior to perforation thereof by the cutting tool.
7. In a riveting machine having a pair of mutually opposed jaws, one disposed above the other, with a work piece supporting assembly mounted upon the lower jaw and a drilling assembly and a rivet holding member movably supported in association with the upper jaw, said drilling assembly and rivet holding member adapted alternately to advance to and withdraw from a work piece to be perforated and riveted, said drilling assembly comprising a housing, a cutting tool rotatively supported by said housing, a gear train carried by said housing operatively connected to said cutting tool for rotating it, gage means supported in association with said housing and operative to determine the depth of perforation of the work piece by the cutting tool,
. housing, said housing having passages therein interconnecting said air lead-in member and the space defined by the ring member, into which space air may be passed to act upon the area of the work piece being perforated by the cutting tool, an air motor mounted on said upper jaw, a drive shaft assembly operatively interconnecting said motor and said gear train, valve means for controlling the feeding of air to said air blast means and to said air motor, means for actuating said valve means to feed air to said air motor to effect operation of said cutting tool prior to its engaging the work piece, and clamping means operatively mounted on the upper jaw adapted to contact and press upon the work piece prior to perforation thereof by the cutting tool.
8. In a riveting machine having a pair of mutually opposed jaws, one disposed above the other, with a work piece supporting assembly mounted upon the lower jaw and a drilling assembly and a rivet holding member movably supported in association with the upper jaw, said drilling assembly and rivet holding member adapted alternately to advance to and. withdraw from a work piece to be perforated and riveted, said drilling assembly comprising a housing, a cutting too1rotative1y supported by said housing, a gear train carried by said housing operatively connected to said cutting tool for rotating it, gage means supported in association with said housing and operative to determine the depth of perforation of the work piece by the cutting tool, said gage means comprising a ring member movably mounted on said housing in encircling relationship to the cutting tool, means for providing an air blast at the cutting tool effective to blow away dust particles created by the cutting tool in perforating the work piece, said means comprising an air lead-in member supported by the housing, said housing having passages therein interconnecting said air lead-in member and the space defined by the ring member, into which space air may be passed to act upon the area of the work piece being perforated by the cutting tool, an air motor mounted on said upper jaw, a drive shaft assembly operatively interconnecting said motor and said gear train, said drive shaft assembly comprising telescopic means, a universal joint connecting one end of said telescopic means to said motor, and a second universal joint connecting the opposite end of said telescopic means to said gear train, valve means for controlling the feeding of air to said air blast means and to said air motor, means for actuating said valve means to feed air to said air motor to effect operation of said cutting tool prior to its engaging the work piece, and clamping means operatively mounted on the upper jaw adapted to provide a clamping pressure upon the work piece prior to perforation thereof by the cutting tool, said clamping means comprising an air cylinder having a piston movable toward and away from the work piece, an elongated member having one end pivoted to said upper jaw, and means interconnecting said elongated member and said piston whereby said elongated member is movable to the work piece to bring its free end into clamping engagement therewith.
FRANK A. BOYLE.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,431,749 Newman Oct. 10, 1922 2,216,403 Oeckl et a1 Oct. 1, 1940 2,290,440 Lindstrom July 21, 1942 2,454,596 Dawson Nov. 23, 1948 2,488,645 speller et al Nov. 22, 1949