US 3256730 A
Description (OCR text may contain errors)
June 21, 1966 J. K. FAULL 3,256,730
METHODS OF AND DEVICES FOR FORMING APERTURES IN TUBULAR STOCK Original Filed Sept. 26, 1962 4 Sheets-Sheet l INVENTOR. JAME$ K. F'Au L L Mm /f A Tram/6p June 21, 1966 J. K. FAULL 3,256,730
METHODS OF AND DEVICES FOR FORMING APERTURES IN TUBULAR STOCK Original Filed Sept. 26, 1962 4 Sheets-Sheet 2 km N INVENTOR. JAMES K. FAuLL.
/MM WM June 21, 1966 J FAULL 3,256,730
METHODS OF AND DEVICES FOR FORMING APERTURES IN TUBULAR STOCK Original Filed Sept. 26, 1962 4 Sheets-Sheet 5 INVENTOR JAMES K. FAU u.
June 21, 1966 J. K. FAULL 3,256,730
METHODS OF AND DEVICES FOR FORMING APERTURES IN TUBULAR STOCK Original Filed Sept. 26, 1962 4 SheetsSheet 4 INVENTOR. JAMEs K. FAuu.
BY M/%% A T TOR/V175 United States Patent 3,256,730 METHODS OF AND DEVICES FOR FORMING APERTURES IN TUBULAR STOCK James K. Faull, 16 Walker Court, Poland, Ohio Continuation of application Ser. No. 226,216, Sept. 26, 1962. This application Apr. 8, 1965, Ser. No. 449,920 20 Claims. (Cl. 72-324) The present invention relates to methods of and devices for forming apertures in tubular stock and the like, and the principal object of the invention is to provide new and improved methods and devices of such character.
The present application is a continuation of application Serial Number 226,216, filed September 26, 1962, now abandoned, by James K. Faull, and entitled Methods of and Devices for Forming Apertures in Tubular Stock.
While dies have long been used in presses for piercing tubular and other stock, such dies are relatively expensive and thus are practical only for relatively long production runs. Similarly, most of such dies have been able to accommodate but one stock size thus further limiting their use where stock sizes must frequently be changed. For at least these reasons, drilling apparatus has frequently been used in relatively short run manufacturing operations despite the many advantages piercing possesses over drilling.
In contrast with prior art apparatus, the present invention provides a piercing device which is quite simple and therefore low enough in cost to warrant its use in relatively small production runs. Moreover, provision is made for not only varying the size of the hole pierced but also for varying the size of the stock being pierced. Other advantages will readily become apparent from a study of the following description and from the drawings appended hereto.
In the drawings accompanying this specification and forming a part of this application there is shown, for purpose of illustration, embodiments which the invention may assume, and in these drawings:
FIGURE 1 is a perspective view of a preferred embodiment of the invention,
FIGURE 2 is a reduced size perspecive view of a detail seen in FIGURE 1,
FIGURE 3 is an enlarged, longitudinal sectional view generally corresponding to the line 3-3 of FIGURE 1,
FIGURE 4 is a fragmentary elevational view of a portion of the device seen in FIGURE 1,
FIGURE 5 is a view similar to FIGURE 4 but with certain parts in alternate positions,
FIGURE 6 is a reduced size elevational view of the device seen in FIGURE I mounted for fuse'in fragmentarily illustrated press apparatus,
FIGURE 7 is a transverse sectional view taken through a tube after it has been pierced by use of the present invention, and
FIGURE 8 is a view similar to FIGURE 1 but of another embodiment,
With reference to the embodiment of the invention seen in FIGURE 1, the invention comprises an elongated base 10 having at one end an upwardly facing, rounded bottom slot 11 and at its other end an upwardly projecting slide member 12. In operation, stock to be pierced will be placed in the slot 11 and the slide member 12 forced downwardly with any suitable force-applying apparatus to thereupon pierce the stock as will later be disclosed in greater detail.
With particular reference to FIGURES 2 and 3, base 10 has an upwardly facing recess 13 opening from its right-hand end and terminating short of the slot 11 for closely but slidably receiving a slide member 14 whose right-hand end terminates in an inclined cam surface 15 for a purpose to appear. A plate 16 is removably secured to the right-hand end of base 10 by screws 17 to close recess 13, the base providing a slot 18 for closely receiving the lower edge of such plate. Similarly, the upper portion of recess 13 is closed by a plate 19 removably secured to the base by means of screws 20. Plate 19 is apertured at 21 to slidably pass the previously mentioned slide member 12 whose lower end has a cam surface 22 in engagement with the cam surface 15 of slide member 14. Plate 19 is of a length to extend beyond plate 16, the former having a groove 23 for closely receiving the latter. Since plate 16 must resist considerable force as will later appear, its interlocking engagement with the base 10 and the plate 19 as above described will in part relieve screws 17 of this function.
Means are provided for resiliently urging the slide 14 to the position illustrated in FIGURE 3 and with reference to the latter, a helical compression spring 23 is disposed in aligned counterbores 24, 25, respectively provided by the base 10 and the slide 14.
Carried by the slide 14 in a manner later to be disclosed in detail is a punch 26 of a length to extend into a flanged guide bushing 27 which is seated within an opening 28 in the base. A set screw 29 removably retains the guide bushing in position in the base opening and against unintentional disassembly therefrom. Also carried by the base 10 is a die bushing 30 whose bore is precisely aligned with the bore of guide bushing 27 to closely receive the punch 26. In a manner similar to bushing 27, bushing 26 is seated in a through opening 31 in the base and is retained against unintentional disassembly therfrom by a set screw 32.
Since the embodiment thus far described is designed to pierce round tubing in a given maximum outside diameter, the width of slot 11 is of a size to closely receive such tubing size while the slot bottom is round to correspond to the arcuate, external surface of such tubing size. The aligned axes of punch 26 and bushings 27, 30 are so arranged that they intersect the longitudinal axis of the size tubing aforesaid when it is bottomed in the slot. Accordingly, when the device is actuated to pierce a hole in the tubing such hole will be centered thereon.
Turning now to the manner in which punch 26 is secured to slide 14 and still refering to FIGURE 3, such slide is provided with a blind, internally threaded bore 33 which loosely accommodates an enlarged head 34 formed on the right-hand end of the punch 26. Loosely fitting about the punch is an externally threaded sleeve 35 having a radially enlarged flange 36 providing a series of spoke-like arranged, radially inwardly extending apertures 37 for receiving a suitable wrench by means of which the sleeve may be rotated. Note that the righthand end of sleeve 35 is designed to abut the punch head 34 and to force it tightly against the bottom of the slide bore 33 while considerable radial clearance is provided between the sleeve bore and the punch for reasons to appear.
Upon initial assembly of the device or whenever the punch is changed, the punch will be assembled with the slide 14 with the latter disassembled from the base 10. However, sleeve 35 will not be tightened at this time but will merely hold the punch loosely assembled with the slide. Slide 14 will then be assembled with the base with the punch extending into the guide bushing 27 as illustrated. Since the punch has not yet been tightly clamped to the slide, it will readily align itself with the guide bushing. Sleeve 35 may now be rotated to tightly clamp the punch to the slide, the punch remaining aligned with the guide bushing since adequate clearance is provided between the punch and the bore of bushing 35 to insure against interference therebetween.
Thus, the necessary accurate alignment of the punch is insured even though slight machining errors may be present. Also, the provision for punch alignment makes it practical to employ punches of different sizes when different sizes of holes are to be pierced. Such a requirement merely necessitates removal of the punch 26 and the sleeve 35 from the slide 14, removal of bushings 27 and 30 from the base 10, and their substitution by similar parts of the proper cooperating sizes.
In operation of the assembled device as thus far described and with reference to FIGURE 6, the base may be clamped to the bed 38 of a press 39 with the slide member 12 beneath the pres ram 40. The tubing to be pierced will be disposed in the base slot 11 and the press ram then lowered to depress the slide 12. As the latter descends, it surface 22 in cooperation with the surface of the slide 14 will cause the latter to shift to the left (in the position of parts viewed in FIGURE 3) to thus drive the punch into the tube. If a hole is to be made in but one side of the tube, the press ram will only be actuated far enough to drive the punch through the near wall of the tube. If however, a hole is to be made completely through the tube, the punch will be driven into the die bushing 30 thus piercing both sides of the tube.
Still referring to FIGURE 6, it is an important feature of the present invention that tubing may be pierced with much greater safety to the operator than is the case with conventional devices heretofore employed for this purpose. This result attends because the hand of the operator, in placing and removing the tubing from the base slot 11, are at all times a safe distance from beneath the press ram 40. Another important feature is that the upwardly facing, work-receiving slot 11 greatly facilitates disposition and removal of the tubing in piercing position thus assisting the operator to attain high production.
While the previously mentioned slide 12 may be directly engaged by the press ram 40 during the piercing operation, it is preferably to provide an upstanding bolt 41 with which the ram may engage. Such bolt is preferably threaded into the slide 12 and is locked against rotation by a nut 42. Bolt 41 serves two main purposes: Firstly, by varying the amount of bolt projection, the amount of punch movement may easily be adjusted without changing the stroke of the press ram. This greatly facilitates set-up operations. Secondly, the compressive strength of bolt 41 is such that it will collapse before damage can occur to the device in the event the latter becomes jammed for some reason and the press exerts a greater pressure than the device can safely withstand.
With reference now to FIGURE 7, it is to be understood that whenever a punch is forced through the wall of a metal tube from the outside, and the inside of the tube is not supported closely adjacent the punch, the tube wall will buckle inwardly thus forming an indentation 43 surrounding such pierced hole 44. While such an indentation may not be undesirable, and at times may even be essential, it i necessary that such indentation not be excessive since the strength of the tube at this point would be drastically reduced.
In order to limit such indentation, the working end 126 of punch 26 is disposed at an angle to the punch axis as illustrated in FIGURE 3. With the punch end thus configurated, entry thereof into the tube will be facilitated thus resulting in a smaller indentation thereof. This results since the angled end of the punch causes the hole 44 in the tube to be progressively pierced rather than piercing the entire hole substantially instantaneously. Obivously, the greater the angularity of the punch end,
the less will be the indentation. While the hole 44 pierced from the outside will be surrounded by an indentation, it will readily be apparent that the opposite hole 45, since it is pierced from the inside with the die bushing 30 supporting the tube exterior, will have no indentation thereadjacent.
Another advantage of employing the angled-end punch is that the slug 46 pierced from the hole 44 will not be completely severed from the tube but will remain attached to the interior thereof at one side of the hole 44 as illustrated. This is highly advantageous since it obviates removing the slug from the tube to prevent it from rattling around inside. Furthermore, by leaving the slug attached to the tube, there is no danger of the slug being caught between the punch and the far wall of the tube to thus interfere with piercing hole 45. The slug remains attached to the tube, as shown, since the last portion of the punch to enter the tube does not completely sever the slug therefrom but merely pushes it to one side of the hole 44.
The construction thus far described is quite suitable so long as but one external size tube is being pierced; however, in the event tubing having a smaller outside diameter is to be pierced, means must be provided to both reduce the effective width of slot 11 and to in effect raise the bottom thereof so that the center of such smaller tube will intersect the axis of the punch.
Referring once again to FIGURE 1 and as also may be seen in FIGURE 4, an angularly disposed groove 47 is formed in the near side of base 10 adjacent the work-receiving slot 11. Slidable in groove 47 is an angular adjusting plate 48 having a vertical surface 49 and an inclined surface 50. Plate 48 is secured to base 10 by means of a flat head screw 51 which passes through a slot 52 in the plate and is threaded into the base. Slot 52 is elongated in the same direction as groove 47 so that when such screw is loosened, the plate may be adjusted along the groove to various positions.
In order to insure precise location of the adjusting plate 48 in various positions corresponding to various standard tubing sizes, a series of countersunk portions 53 are spaced along slot 52 to receive the tapered underside of the head of screw 51. Although not shown in detail, the just described groove and adjusting plate structure is duplicated on the far side of the base 10.
With both plates 48 positioned as seen in FIGURES 1 and 4, tubing of maximum size; that is, tubing having an outside diameter which just fits within the base slot 11, will be accommodated. Note that each screw 51 will be disposed at the upper end of its adjusting plate slot 52 with its head seated in the uppermost countersunk portion 53.
When tubing of minimum size is to be pierced, each of the adjusting plate screws 51 will be loosened and each plate 48 will be slid along its groove to the position illustrated in FIGURE 5. This will position each of the adjusting plate screws at the lower ends of the adjusting plate slots 52 wherein they may be tightened to seat in respective, lowermost countersunk portions 53 to thus retain the plates in position. It is important to note that with the plates positioned as seen in FIGURE 5, both the effective width and the effective depth of slot 11 are reduced to receive the smaller diameter tube.
The reduced effective width of slot 11 is accomplished upon shifting the plates 48 as above described since the plate surfaces 49 are caused to move toward the facing surface of the slot 11 until only suflicient space remains therebetween to closely receive the smaller tube. Similarly, the reduced effective depth of the slot 11 is accomplished since the plate surfaces 50 are caused to move upwardly an amount to support the smaller tube with its axis aligned with that of the punch 26. Obviously, if an intermediately sized tube is to be pierced, the plates 48 will be disposed in one of their intermediate positions along their grooves 47.
Under certain circumstances, it is highly desirable that the opposed holes in the tube each be pierced from the outside to thus form an indentation, similar to that shown in FIGURE 7, about each of the holes. For this purpose, the embodiment of the invention illustrated in FIGURE 8 may be employed and since the structure is similar to that heretofore described, corresponding parts are identified with the same reference characters but with the suffix a added. In this embodiment, the work-receiving slot 11a is disposed intermediate the base ends with a punch and slide mechanism similar to that previously described on each side of the slot and with the punches in opposed, axial alignment.
With the construction as thus far described, tube to be pierced will de disposed in the slot 11a and the slides 12a simultaneously forced down by the ram of a suitable press or the like., Downward movement of the slides 12a will cause the respective punches actuated thereby to advance toward each other into the slot 11a to pierce aligned holes in the tube.
The embodiment of the invention seen in FIGURE 8 is also designed to accommodate tubing of various external sizes and for this purpose a pair of adjusting plates 48a, 148a are slidably carried by respective grooves 47a, 147a on each side of the base a. These plates function in the same manner as the previously described plate 48; however, in this case, both plates on each side must be adjusted so that the space between the plate surfaces 49a, 149a closely receives the tube and the Plate surfaces 50a 150a support the tube at the required height aligned with the punches. With all of the plates properly adjusted, the tube will be supported centrally of the slot 11a regardless of tube sizes.
While a single adjusting plate locking screw and slot like that previously described could be employed to ad-' justably locate adjusting plate 48a, it is preferable to employ two screws 51a, 511a which extend through respective parallel slots 52a, 52.111. Similarly, plate 148a is located by screws 151a, 151.111 in slots 152a, 1521a respectively. The screws and slots aforesaid will prefera-bly be identical to screws 51 and slots 52 and, of course, the adjusting plates on the rear side of the base will similarly be located. 1
The purpose of using two screws and slots for each plate is for the purpose of obtaining closer location of the latter in preselected positions corresponding to the various standard sizes of tubing. This is accomplished by so relating the screws and slots to each other that, when screw 51a is aligned with a countersunk portion 53a, the screw 51.1a is spaced between adjoining countersunk portions 58.111. Thus, by using one or the other of the screws 51a, 51.1a, the plate 48a may be located in preselected positions spaced apart one half the distance between adjoining countersunk portions. While only plate 48a and its locating and locking structure has been described in detail, all of the'other plates will be similarly located and locked.
Still referring to FIGURE 8, it will be noted that movement of the plates 48a, 148a along their grooves in an upward direction would cause interference at their adjoining corners. In order to obviate such interference, the near side of plate 48a is cut away at 54 while the far side of plate 148a is similarly cut away to permit the remaining plate portions to overlap each other without interference. Obviously, the adjusting plates on the rear side of the base will. be similarly cut away for clearance.
Although punch 26 has been shown in FIGURE 3 with its angled end so arranged that the punch point is uppermost, it will be understood that the punch may readily be rotated about its axis, with sleeve 35 loosened, to otherwise position the punch point. For example, particularly when piercing relatively small diameter tubing, it is usually desirable to rotate the punch point 90 degrees from the position shown in FIGURE 3 so. that it lies in the horizontal plane (in the position of parts shown) in which the punch axis lies. In such position and during the punching operation, the punch point first enters the tube at a place aligned with the tube axis. Obviously, with the punch so positioned, the slug 46 seen in FIGURE 7 will remain attached to the tube wall but at a place 90 degrees from that shown.
While the piercing of round tubing only has herein been disclosed, it will be'understood that tubing of other shapes, such as, for example, square tubing can as well be pierced merely by providing the proper shape of work-receiving slot in the device base. Moreover, the device is not limited to the piercing of tubing but is adaptable for use in piercing material of other configurations.
In view of the foregoing, it will be apparent to those skilled in the art that I have accomplished at least the principal object of my invention and it will also be apparent to those skilled in the art that the embodiments herein described may be variously changed and modified,
without departing from the spirit of the invention, and that the invention is capable of uses and has advantages not herein specifically described; hence it will be appreciated that the herein disclosed embodiments are illustrative only, and that my invention is not limited thereto.
1. A stock piercing device comprising a base having a slot for closely and slidably receiving the stock to be pierced, a punch slidably carried by said base for movement transversely of and into said slot to pierce the stock disposed therein, and means for varying both the effective width and effective depth of said slot to properly locate said stock relative to the axis of said punch.
2. The construction of claim 1 wherein said means simultaneously varys both the effective width and effective depth of said slot.
3. A device for piercing stock of various transverse sizes comprising a base having a slot for closely and slidably receiving the stock to be pierced, a punch slidably carried by said base for movement transversely of and into said slot to pierce the stock disposed therein, and means carried by said base at opposite ends of said slot for varying both the effective width and effective depth of the latter to thus properly locate various transverse sizes of stock relative to the axis of said punch.
4. A stock piercing device comprising a base having an upwardly facing slot for receiving the stock to be pierced, a punch slidably carried by said base for horizontal'movement transversely of and into said slot to pierce the stock disposed therein, and means for varying the effective width and effective depth of said slot to thus properly locate various transverse sizes of stock relative to the axis of said punch, such means comprising a member slidably carried by said base and having a pair of angularly disposed faces for engagement with the stock.
5. The construction of claim 4 wherein interengageable means, in part carried by said member and in part carried by said base, provide a plurality of stops for accurately locating said member along said base in proper position to accommodate various standard sizes of stock.
6. The construction of claim 4 wherein said member is slidable along said base at an angle to the direction of punch movement.
7. The construction of claim 4 wherein one of said member faces is generally parallel with one of the side faces of said slot while the other of said member faces underlies the stock, wherein said member is slidable at an angle to the direction of punch movement whereby said one member face is shifted toward or away from said one slot face depending upon the transverse size of the stock to closely receive the latter therebetween, and wherein said other member face is simultaneously shifted up or down depending upon the transverse size of the stock to support the latter at the required height relative to the punch axis.
8. The construction of claim 7 wherein said member has an elongated aperture and wherein a screw extends through said aperture and is threaded into said base to retain said member in adjusted position relative thereto.
9. The construction of claim 8 wherein said screw has a conical head for engaging said member and wherein the latter provides a plurality of notches in which said screw head selectively seats to thus provide a plurality of stops for accurately locating said member along said base in proper position for various standard sizes of stock.
10. A stock piercing device and the like comprising an elongated base having at one end a transversely extending, upwardly facing slot for closely and slidably receiving the stock to be pierced, a first slide carried by said base for horizontal movement toward and away from said slot, a punch carried by said first slide for movement therewith transversely of and into said slot for piercing the stock disposed therein, a second slide carried by said base for vertical movement and disposed in spaced relation with said slot, said first slide having connection with said second slide whereby vertical movement of the latter effects horizontal movement of the former, and means carried by said base for varying both the effective width and the effective depth of said slot to thus properly locate various transverse sizes of stock relative to the axis of said punch. I
11. A device for piercing holes in opposite sides of tubular stock from the exterior thereof, comprising a horizontally elongated base having an upwardly directed slotintermediate its ends for closely receiving the stock to be pierced, a first pair of slide members carried by said base on opposite sides of said opening and shiftable horizontally toward and away from the latter, a punch carried by each slide member and each punch being shiftable with its slide member into said stock opening to pierce the stock disposed therein, a second pair of slide members carried by said base for vertical shifting movement and having connection with respective first slide members to effect reciprocation thereof, and means for varying both the effective width and the effective depth of said stock opening to thus properly locate the stock relative to said punches.
12. The construction of claim 11 and further comprising means for simultaneously varying both the effective width and the effective depth of said stock opening to thus properly locate the stock relative to said punches.
13. The construction of claim 12 wherein said means comprises a pair of plate-like members carried by said base and providing respective, generally vertical faces in opposed relation for closely receiving therebetween the stock to be pierced and such members also having respective other faces for underlying and supporting the stock, each of said members being shiftable in respective directions which are inclined with respect to each other and which are also inclined with respect to the direction of punch movement to thereby vary the spacing between said member vertical faces and the spacing between the punch axes and said other member faces to thus accommodate stock of various transverse sizes.
14. A stock piercing device and the like comprising a base having an upwardly directed stock opening for closely receiving the stock to be pierced and a horizontally extending guide opening intersecting said stock opening, a first slide carried by said base for horizontal movement axially of said guide opening toward and away from said stock opening, a punch closely fitting in said guide opening and being guided thereby, said punch being carried by said first slide for movement therewith and in one position of said first slide said punch being spaced from said stock opening to provide for ready entry of said stock thereinto and ready exit of said stock therefrom and in another position of said first slide said punch projecting into said stock opening to pierce said stock, a second slide carried by said base for vertical movement and disposed in spaced relation with said stock opening and said first slide having connection with said second slide whereby vertical movement of the latter effects horizontal movement of the former, and means removably connecting said punch to said first slide and providing for transverse adjustment of said punch relative to said slide to accurately align said punch with said guide opening despite slight machining errors.
15. The construction of claim 14 wherein said punch has a headed portion abutting said first slide, wherein an externally threaded sleeve member fits over said punch and engages the headed portion thereof, wherein said sleeve member has threaded engagement with said first slide to draw said punch thereagainst, and wherein there is sufficient radial clearance between said punch and said sleeve member to provide the adjustment aforesaid.
16. A stock piercing device and the like comprising a base for supporting the stock to be pierced, a slide shiftably carried by said base and actuating a punch which pierces the supported stock upon movement of said slide, and an extensible-retractable member carried by said slide for correlating the stroke of said device with that of a pressure-exerting mechanism, said member having such predetermined strength that it will distort under excess pressure to prevent damage to said device.
17. A stock piercing device and the like comprising a base for supporting the stock to be pierced, a first slide carried by said base for horizontal reciprocatory movement, a punch carried by and reciprocable with said first slide, a second slide carried by said base for vertical reciprocatory movement and having connection with said first slide whereby movement of said second slide effects movement of said first slide, and an extensible-retractable member carried by and projecting upwardly of said second slide for engagement with a pressure-exerting mechanism and such member correlating the stroke of said device with that of such mechanism, said member having such predetermined strength that it will distort under excess pressure to prevent damage to said device.
18. A stock piercing device comprising a member having a guide opening therethrough, a slide, means guiding said slide for rectilinear movement axially of said guide opening toward and away from said member, a punch carried by and movable with said slide and closely fitting within said guide opening and being guided thereby, and means for removably securing said punch to said slide at any position within an area generally concentric with said guide opening axis to thus insure precise alignment of said punch with said guide opening despite slight machining errors.
19. A stock piercing device comprising a member having a guide opening therethrough, a slide, means guiding said slide for rectilinear movement axially of said guide opening toward and away from said member, a punch moveable with said slide and having a headed portion abutting the latter and a shank portion closely fitting within said guide opening and being guided thereby, and an apertured retainer encircling said punch shank portion and said retainer being removably secured to said slide and clamping said headed punch portion thereagainst, the aperture in said retainer being slightly larger than the encircled punch shank portion to provide for transverse adjustment of said punch relative to said slide to insure precise alignment of said punch with said guide opening despite slight machining errors.
20. The construction of claim 19 wherein said retainer has externally formed threads cooperable with internally formed threads of said slide to provide for securing said retainer to said slide.
References Cited by the Examiner UNITED STATES PATENTS 1,196,632 8/1916 Abrams 72465 2,556,681 6/1951 Davis et al. 8840 2,701,018 2/1955 Glitsch 72294 3,064,707 11/1962 Walts 7294 3,080,473 3/1963 Kennedy 219149 CHARLES W. LANHAM, Primary Examiner. W. H. JUST, Assistant Examiner.