|Publication number||US2741461 A|
|Publication date||Apr 10, 1956|
|Filing date||Sep 7, 1950|
|Priority date||Sep 7, 1950|
|Publication number||US 2741461 A, US 2741461A, US-A-2741461, US2741461 A, US2741461A|
|Inventors||Joy Joseph F|
|Original Assignee||Joy Mfg Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (8), Classifications (14)|
|External Links: USPTO, USPTO Assignment, Espacenet|
April 10, 1956 J. F. JOY 2,741,461
DRILL Filed Sept. 7, 1950 6 Sheets-Sheet l E Q' 3b 230 34' I I I I s4 JnsepllflJby A TTORNEY April 10, 1956 .1. F. JOY 2,741,461
DRILL Filed Sept. 7, 1950 6 Sheets-Shae; 3
NVENTOR.' JosepllFJby B QF A rramvsy J. F. JOY
April 10, 1956 DRILL 6 Sheets-Sheet 5 Filed Sept. 7, 1950 J. F. JOY
April 10, 1956 DRILL 6 Sheets-Sheet 6 Filed Sept. 7, 1950 /NVENTOR. Jasep/IE' 0y 5v Arronuzv United States Patent Dam.
Joseph F. Joy, Pittsburgh, Pa., assignor to Joy Manufacturing Company, Pittsburgh, Pa., a corporation of Pennsylvania Application September 7, 1950, Serial No. 183,585
Claims. (Cl. 255- 37) This invention relates to a combination wrench and drill device, especially to a portable device for use in mines. 7
There are many requirements in underground mining today for drilled holes. One such application is connected with the relatively new practice of roof bolting as a substitute for timbering to prevent roof falls. This method of roof control is disclosed in my application Ser. No. 120,734, filed October 11, 1949, and necessitates drilling holes into the mine walls, locating an expansion bolt in each hole thus made, and bolting a plate, angle iron, channel, or the like tightly against the strata by means of the expansion bolt. The strata are thus held to a minimum of flexing and roof falls are effectively prevented.
With this method of roof control, it often happens that the hole which is to be drilled must be substantially longer than the dimension of the space in which the work must be done. There is, accordingly, a real need for a light, mobile drill, capable of standing erect, and of drilling a hole into the strata which is greater in depth than the height of the space in which the drill is located. There is moreover, a need for a tool which can quickly tighten up the nuts on the bolts in order to avoid the time-consuming tightening of these nuts by hand. It may be noted, however, that the need is not limited to holes in the roof, and the device of this invention is capable of general application to drilling in underground mines.
It is, accordingly, an object of this invention to provide an improved device which carries a drilling tool and which is telescopically mounted and is extensible to a length greater than the drill height; it is a further object of this invention to provide such a device which is capable of engaging and tightening the nuts on the roof bolts. Other objects and advantages will be apparent 7 to those skilled in the art.
In the drawings:
Fig. 1 is a view in elevation of the device as seen from the cable reel side.
Fig. 2 is a top plan view of the device.
Fig. 3 is a view in section substantially on line 3-3 of Fig. 2. 1
Fig. 4 is a view in section substantially on line 4-4 of Fig. 3, but on a larger scale.
Fig. 5 is a view in section substantially on line 5-5 of Fig. 3.
Fig. 6 is an enlarged detailed sectional view through the rotatable shaft which carries the drilling tool. This figure is a section on substantially the same plane as that of Fig. 3, but on a larger scale, and is limited to the hydraulic cylinder details and parts immediately adjacent thereto.
Fig. 7 is a top plan view of just the end of the extensible drive means showing the wrench in place.
Fig. 8 is a side elevation view of those parts of the device shown in Fig. 7.
Fig. 9 is a view in section substantially on line 9-9 of Fig. 3, but on a larger scale.
Fig. 10 is a view in section substantially on line 1010 of Fig. 6, but on a larger scale.
Fig. 11 is a schematic diagram of the hydraulic system which is connected to supply power to extend the telescopic drive means. The apparatus is shown in Fig. 11 in its neutral position-i. e., in the position in which fluid is trapped in the hydraulic cylinder.
Fig. 12 is a view similar to Fig. 11, but showing the valve in the operating position in which fluid is supplied to the hydraulic cylinder to extend the telescopic drive means.
Fig. 13 is a view similar to Fig. 11, but showing the valve in position to allow fluid to be withdrawn from the hydraulic cylinder.
Fig. 14 is an operational side elevation view showing the device in an erect position placed between the floor and the roof and drilling a hole in the roof.
Fig. 15 is a similar operational view, but showing the device located to drill a hole in the roof at an angle from the vertical, and
Fig. 16 is a partial view in elevation of the extensible drive means, but showing the wrench in place and in engagement with a nut on the end of a roof bolt.
Referring now to the drawings in detail, a device made according to this invention is shown as having a support such as a housing 2 provided with a bottom plate 4 removably secured to the housing by means of bolts 6, anda cover 8 removably secured to the top of the housing by means of bolts 10.
The device is preferably made mobile by providing a pair of rubber-tired wheels 12 suitably mounted on the housing. The wheels 12, of course, constitute a floor-engaging support by which the device is readily moved about from job to job. A second floor-engaging support 14 is suitably secured to the bottom plate 4. The support 14 in the preferred embodiment consists of a beam having downturned ground points 16 at its ends, and being pivotally secured at a point between its ends to the bottom plate 4 by means of a bracket 18 and a pin 20.
The cover 8 supports a pair of tubular columns 22 and 24 by means of flanges 26 secured to the lower ends of tubes 22 and 24; the flanges in turn are secured to the. cover 8 by any suitable fastening means such as the bolts 23. Rods 3i have telescoping engagement with the tubes 22 and 24, and are clamped in any desired position by means of the knurled nuts 32 which have threaded engagement with the split upper ends of tubes 22 and 24. .Handle bars 34 are secured to the upper ends of rods 30, and are connected by a central ring 36. A leg 38 having a curved foot 49 is secured to the ring 36 by means of a pair of brackets 42. Hand grips 44 are provided at the outer extremities of the handle bars 34.
A drilling tool 46 of any suitable type is extensibly carried and driven by a hydraulic cylinder 48 (Figs. 3, 6, and 10). Hydraulic cylinder 48 is rotatably carried in a hollow support 50 which is preferably an integral 7 part of the main housing 2. Hydraulic cylinder 48 is.- rotatably mounted in bearings such as the anti-friction bearings shown generally at 52 and 54. As is best evident in Figs. 3 and 6, cylinder 48 is held against axial movement by the same anti-friction bearings 52 and 54.
Near its lower end, cylinder 48 is fitted with keys 56. A shipper ring 5% has sliding engagement with the keys 56, and carries internal teeth and 62 at its opposite ends. The ring 58 is grooved between its ends as shown at 64, the groove 64 being adapted to receive the pins 66 of a shipper yoke 68.
The internal teeth 60 and 62 of the shipper ring 58 comprise a dog clutch engageable alternatively with external gear teeth "70 and 72, respectively. The shifting of the shipper ring 58 by means of shipper yoke 68' is accomplished by an operating handle 74 (Fig. 2) which may be connected in anysuitable manner, aswill be, understood by those skilledin the art, to manipulate the yoke 6,3.
byany suitable bearing means, and carries secured thereto a gear 126 which meshes with another gear 128. Gears 126 and 128, together with the casing 124, constitute a gear pump 130. Gear pumps of this type are well known in the art and need not be detailed here.
Gear pump 130 provides fluid under pressure for'the hydraulic system that includes the hydraulic cylinder 48 and a valve 132. It will be understood that this hydraulic 1 system uses the well 134 in bottom plate 4 at one side of artthat the showing of the motors is incomplete; for the sake of: simplicity', the motor field windings and the brushes which contact the commutators 86, are. notshown,
Itwill be understood that the motors are, substantifilly identical in order that the parts thereof may be interchangeable. The rotor shafts extendjdownward as shown at 88 and 89. and carry near their lower ends drive pinions 90 and91'. The pinions mesh with andfdrivealarge gear 92- see alsoFi'g. 5). Large gear 92 is provided with an integral hub 94 on which are, formed the gear teeth 70' referredto above as'being'engageable with the internal teeth ofjthe shipper ring'58: See also Fig, 6;, The
' teeth extend substantially the. full length f the,- hub 94,- andengageattheir upper endsa pair of gears 9 6jand 98: The gear961 is keyed to anddrives a shaft 10Uwhi'ch is rotatable in-anti friction bearings 102 and 104; Shaft is provided at its lower end with external teeth 16,
forming-adrivepinion which meshes with a centrally located gear 108 rotatable on a sleeve bearing 1109 on the hydraulic cylindersr Gear 108' is provided with a centraLhub-1-la0on which are formed the gear teeth or splines, 72; referred to above as being engage'able with the internal teeth or splines 62 of" shipper ring 58.-
Gear: 108 desirably-incorporates" a clutch having a disc lllaintegralwith the gear teeth and" gripped between discsl Ll-b and 111a; Springs 112 provide the pressure to achieve the necessary friction between discs;
Similarly; gear-98iskeyed to a hollow shaft'113'which is-rotatablein antifr-iction bearings'1e14 and 116; Shaft 113 carries an integral pinion 118 which corresponds to the=pini0n 106; and whichalso meshes with the large centrally located gear 1 0%.
From the: foregoing, it will be evident to those skilled" in. the artthat the. external gear'teeth 79 are driven by theelectricmotors at a given speed; and thatthe drive fonthesexternal gear teeth-72 is at a substantially reduced" speedz A; desirable speed of the teeth 70 is 5-20 R P Mi, toednivelt-he drilling tool: 46; and adesirable speed of the; teeth 72is. 5931 R R M., to drive the wrench (latende scribeds); Thus the gears having teeth 70 and 72 00111- pi'ise a-plurality ofdriven members connected to the elec: tricmojtop onmotors, and shipper-ring 5S is-a drive mem-' bar; the-islcn'ppenfork and handle 74, together with their connecting linkage ete.,. form means toconnect-r aselected one ofgthe;driveremernbers 70; and 7-2 with'thedrive memberaistto driveone ofsaid: driven members. 1
ever; in this instance, a shaft 1-20 extends through thehollow shaft-113; and is-provided with a tongue ar its uppenend; to engage thenotched lower end ofextension 8Sb Shaft 120-is thus driven byrotor-78; Anits-lower; end, shaft 120 is rotatably mountedina gear: casing 124 the machine as a sump. The valve body or cylinder 136 is provided with a flange 138 at its upper end; whichis bolted to a septum'in the lower part of housing 2; thus completing an enclosed chamber 139 for the valve'132. The chamber 139 and the corresponding spaeein the other side of the casing are filled with oil and serve as a rescrvoir. The valve cylinder or-body- 1 363is open at its lower end to the sump 134. Reciprocable within the valve body or cylinder 136 is a valve member 141 in the shape of a o l .90 1. h v n an. ppe a d. 142 and; a L w r. lan 143,..with a, groove betweentthem, Theuppenland, 1 42: is provided with diagonal passages144 communicating with, the hollow of; the spool. At itsnpper end, the spool carries an, extension 145 which is groovedtorecei-ve. the actuating; pin of a shipper arm 146. The. shipper arm lj idfis connected in a,'suitable manner to be; actuated from the exterior of, the housing byan, operating handle 1:47. (Fig, 2 aswill be-well'understood by those skilledin the,
Con uit. 1, c nnec s. h upper nd of cylind 3 with thqp ump suction, and a. conduit 149 (Figs, 11,12 and 13) connects thepump discharge withthelowen end. ofcylipde 136 by way of passage 150; A conduit 151 connects valve 132 with the lower end of hydraulic cylinr der 48, by way of a radial passage 152, in. cylinder head 5: n an ax allpassag .5 e e ing upward rom. he: radialjpassage 152. A pressure reliefvalvevr islocated. in a branch offconduit 149, anddischargesinto thereservoir space. Obviously, valve, V; is effective, (andnecessary) only for the operating position of member 14L shown in Fig; 112.
As is best seen in Fig, 6, axial passage 15,6; opens into; the lower interior of cylinder 48;- Slidable axiallywithin cylinder'48l is an annular member 158,. Annular member- 158 is preferably provided'at its lower end, with any suit,-
Y able seal;- such as the O-ring shown lyingin the groove (Fig: 6). Annular member 158 is provid'edwith keywaysi a resilient annular ring; of any suitable substance 7 such as rubber or the like. A second short depending skirt 172 forms with the skirt 164'an annular grooye which receives a suitable packing material 114., The
paching' 'lTdis-engaged by the upper endof asleeve 176 which is provided with a flange 178'whereby it'is, secured by means of bolts180to-thecover-8i A- second annular-'member1-8 2', similar to but smaller than annular member 158, is reciprocable inside-the eunular meniber' 158; The two annular'members158 and 182 are keyed together against" relative rotation by'meansofi keyway s 184 provided in the outer surface or member 182, and keys 186 (shown in dotted lines in Fig. 10), carried' in annular rnember- 1-58 initsupperend". v A sec ond uppen cyli'nder head- 188 is screwed to theupper end of annularmember .158 at 190.- Upper cylinderhead 188 has no depending skirt tohold the keys 186 in place inannular member-158 in the manner that upper cylih der head 166 holds the keys 162 in place in Cy inder4i Instead; keys 186' merely fit through 'slots' (not shqwn) in member 158; and are preferably weldedin place.
Annular member ls fi' has securedtoits-upper end192 a.
sleeve 194, slotted as shown at 196 to discharge the cuttings; sleeve 194 is provided with an internal flange 198 at its lower end. Flange 192 is welded as shown at 200 to the annular member 158 at the upper end 192. Upper cylinder head 188 is screwed to the upper end of annular member 158, as indicated above, and bears against the upper face of flange 193. At the lower end of its interior, annular member 158 is grooved to receive a snap ring 202. The snap ring 2il2 serves as a lower limit stop for the annular member 182.
A third annular member 204 is reciprocable or slidable telescopically within the annular member 182, and is secured against rotation relative thereto by means of keyways 206 in annular member 204 and keys 208 secured in slots in annular member 132 and held in those slots against radially outward movement by the keeper strips 210 which may be secured in place in any suitable manner. A third upper cylinder head 212 is threaded to the upper end of annular member 132. At the lower end of its interior, the annular member 182 is grooved to receive a snap ring 214 which serves as a lower limit stop for the annular member 204.
As in the case of the annular members 158 and 182, the annular member 2th; is provided at its lower end with a pistonlike portion which is not cut by the keyways 206, and which carries an O-ring to provide a fluid seal.
A shaft 216 is telescopically mounted with respect to the annular member 2 34 and is held against rotation with respect thereto by means of keyways 218 in the shaft and keys 22d and 221 secured in the annular member 29 5 near its upper end. Keys 220 and 221 may be secured in place in any suitable manner, as by being inserted through slots in the wall of the annular member 253 and welded in place.
A fourth upper cylinder head 222 is threaded to the upper end of annular member 204. Near the lower end of its interior, annular member 294 is grooved to receive a snap ring 224. Snap ring 224 serves as a lower limit stop for the rotatable shaft 216.
Cylinder heads 188, 212, and 222 are provided with seals or annular rings of rubber or the like, similar to the annular ring 170 provided for cylinder head 166. It will be understood that the rubber seals will have radially inward projecting ribs filling in the keyways to keep foreign matter out of the mechanism.
The sleeve 124 carries at its upper end a device 226 to engage an extraneous abutment, as for example the roof of a mine room. Inasmuch as the abutment engag ing device 226 will be stationary with respect to the abutment it engages, it must be rotatable with respect to the annular member 153 on which it is carried by means of the sleeve 194-. This relative rotation is provided by the antifriction bearing 22%. Device 226 may be, and preferably is, provided with serrations 230 at its upper end.
Sleeve 194 is provided with openings to receive pins or dogs 232-. Dogs 232 extend radially inward beyond the inner surface of sleeve 1% and serve to engage slots 234 of a'tool such as a wrench 236. The wrench attachment 235 is provided with a suitably designed central opening 238 (Fig. 7) adapted to lit the nuts that are to be screwed to the ends of the expansion bolts.
Reference is made again to the electric motors which drive the gear pump and the hydraulic cylinder. The rotors 76 and 78 of these motors are shown as provided with cooling fans 240 at their lower ends. Suitable axial passages will be provided through the field windings (not shown) to allow the passage of cooling air through these windings. Other axial passages 241a (Fig. 4) and 24117 are provided in the outer portion of the casing 2. Brush supports in the form of discs 242 are secured adjacent e commutators or the rotors by being clamped between the upper ends of the motor housings 244 and depending skirts 246 of cover 3. As is best seen in Fig. 9, discs 242 are provided with peripheral recesses 248 to permit the passage of the cooling air into the field windings from the end spaces 250 provided by the cover 8. The skirts 246 are slotted as shown at 252.
Power is supplied to the electric motors in any suitable manner, as for example through a power cable 264 carried on a cable reel 266. Suitable switch means housed in a box 268 and having an operating button 270 is provided in order to allow the power circuit to the motors to be made and interrupted at will.
Operation In the use of a device made according to this invention, the device is wheeled about in the room to the location where it is desired to drill a hole, as taught in my aboveidentified application Ser. No. 120,734, filed October 11, 1949. By way of illustration, it will be assumed that a hole is to be drilled in the roof. The machine is upended on the ground-engaging support 14 into the position shown in Figs. 3 and 14, or Fig. 15, whereupon the operator manipulates the handle 74 to engage the shipper ring 53 with the gear teeth 70 or the gear teeth 72, depending on the operation. In this case, it is assumed that a hole for a roof bolt is to be drilled, so the ring 53 will be shifted upward in order to make the connection for high speed. The electric power switch is then closed by pressing button 274 to complete a circuit to the motors. With the motors operating, the gear pump 130 is rotating and is supplying oil under pressure to the valve 132 by way of conduit 149.
With the valve in the position shown in Fig. 11, oil merely circulates through the center of the hollow spool. The operator moves the handle 147 to shift the valve member from the position shown in Fig. 11 to the position shown in Fig. 12. Oil under pressure is then supplied from the pump to the bottom of the hydraulic cylinder 48.
With oil under pressure supplied to the lower end of cylinder 43, annular members 158, 182, and 204, and shaft 216 all move upward together, until the roof-engaging device 226 brings its serrations 230 into contact with the roof. There may be some slight penetration of the roof by the roof-engaging device (but such penetration will be largely superficial) until substantial resistance is ofiered by theroof, whereupon the drill presents a substantially rigid column extending from the mine bottom to the roof by way of the telescopic hydraulic cylinder and annular member 158.
It will be remembered that meanwhile the two motors are rotating the hydraulic cylinder, the annular members and the rotatable rod by means of pinions and 91, gear 92, gear teeth 7%, internal gear teeth 60, shipper ring 53 and keys S6, 162, 186, 208, 220 and 221. This" is the high-speed drive and the drill- 46 rotates at drilling speed.
As soon as the roof-engaging device 226 encounters substantial resistance and stops its upward movement, the next annular member 182 moves telescopically outward and upward from the annular member 158. The drill cuts into the roof strata and the cuttings drop downward and fall out through slots 196. Annular member 182 continues to move telescopically outward, sliding axially within annular member 158, until the ends of keyways 184 come against the lower ends of keys 186. When this limit of travel of the annular member 182 is reached, annular member 204 slides within annular member 182 until the lower ends of keyways 206 come against the lower ends of keys 208.
When the upper limit of travel of annular member 204 is reached, shaft or rod 216, which now acts as a piston the hydraulic cylinder, moves telescopically upward,
advancing the drill into the roof. Rod 216 moves upward within annular member 204 until the ends of keyways 218 come against the lower ends of keys 220. This represents the absolute upper limit of travel of the drill,
, but it will be observed that the drill is now extended. 7
upward from the position shown in Figs. 3 and 6 by subnti llv h l ngth. of. nn l r members. 182 nd.;2.Q4,, androtatabl'e' rod Zld, plus s'uchupwarcfmovementofi annular member 158' as was possible. untiLroofi-engaging device, 226 .came into contact with the roof; minus, of course, .the limitations imposed by the fact that the severalikeyways must of necessity remain in engagement with their respective keys.
It may be noted that reliefivalve Vr may be by-passiug oil some of the time during upward movement of the drill. Valve VT will be setto open at a pressure high enough to give anadequately high pressure to advance shaft 21-6 alone against the resistance oftheroof strata. Ifi the drill: should move upward so fastas to overload the drill drive motors, the operatorcan slowdown thefeed by-manipulatingvalve member 141' so as to throttle thefluid going to cylinder 43.
Itwillt be observed' that: thedrill= bit cuts an opening larger than the outside diameter ofthelargest cylinder entering the drilled hole-namely-, the annular memberlower the drill and itsconnecting rotating rod and annular-members; the operator manipulates the handlehandle. 141 to shift thevalve-member from the position it occupies in Fig. 13v into the position shown in Fig; II, in. which position fluid is trapped in cylind'er' 48, and the downward movement of the drill is arrested; if it has not; already reached the extreme lower limit of travel. The. operator.- manipulates handle 74- to shift the shipper ring 58 into neutral, and then slips the wrench attachmerit: 236. into place with, the slots 234 engaging the pins: 232.
A.roo boltis put into place and secured in the hole justamadeby. the drill; Roof bolts of any suitable type may'be used, such as the bolts disclosed and claimed in; my copending. application Ser. No. 120,734, filed October. 11,. 1949;. referred: to above. A. crossbeam or platea2i2imay then be placed againstthe roof and' anut: started: manually on the projecting end ofthe bolt; if the: hole. is; at; an angleas. in Fig. 16, an angle iron 274 may be added, after which the operator; manipulates the handle 14.7: tmadmit: oil: under pressure to the bottom of therhydraulie' cylinder 48, moving annular member 158' f upward luntillltheawrench engages plate 272 or angle274),
zit-which; time thezopenir g 238 in the wrenchattachmentisiin position; to receive; the. nut; The operator then manipulates the. handle; 147 to'trap the oil within cylinder 48 to hold the wrench in the desired position. The. shipper-ring 58;. is then shifted tomesh teeth 62 and 72,
rotatiugthe wrench at; lowspeed, whereupon the nut is screwedup tight'i by power. of theelectricmotors to clamp the, plate;272. firmlyagainst the roof: When thenut: is-tight; thev clutchdiscs 1112:: and 111:: stop, and
V disq: 1:11. 11 Slips. between them.
The bove. description of operation of adevice made accojfiiilg to: this, inventionhas concerned its application tothe taslgofj drilling athol'e in: thereof, securinga bolt 111 1325 l lt h tt file, andrtightening. a nuton the bolt.
It vwill ofgcourse be. evident tothoseskill'ed'inthe-art that As will be understood by those skilledinthe art; a deviceqmade according-to this inyention" can also housed tor-remove-nuts ftomroof bolts, merely by reversing the drive motors: Other'uses'will become evident to those skilledeiirthe art. V
, mounted in theanuular member, means drivingly engagingthe annular, member. and the piston, means to mount.
nevencontami'nated with dust from the mine atmosphere.
The specific air cooling means shown here forms no part of this invention. 7
It will be evident to those skilled in the art that this invention provides an easily movable power-operated drill" and wrench which will Work in a space of low vertical height and which can drill holes equal in length to several times the vertical height of'the workingspace or room; and that thisinvention provides a further advantage in embodying in. one machine a drill as well as a power operated wrench. Other advantages will be apparent'to those skilled in the art.
While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration, and that the invention may bemodified' and embodied in various other forms without departing from its spirit or the scope of the appended claims.
I claim: 7
l". A drill; comprisinga floor-engaging support, a fluid pressure cylinder rotatably carried by the support, an annular member having telescopic engagement with the cylinder and beingextensible upon admission of fluid to the cylinder, a roof engagiug member, means to mount the roof-engaging member on the annular member for free, rotation relative. thereto, a piston rcciprocably mounted in the annular member and having means for fixing it against rotation, relative to the cylinder, means tomgunt a d'rilling tool onthe piston for axial movement.
ber,, means. for, rotatably, mounting said roof engaging member onjthe annular member, a piston reciprocably.
a drilling toolonthe. piston for; axial movement and for. rotation by the.piston,.means,to supply iluid under pres- V surelto the. cylinder andto withdraw fluid from the cyl inder,. and. means: to. rotate the cylinder.
3,. A, drill, as in claim. 1 in which. the roof-engaging member is,annular,,and.lias a plurality of, closelyspaced serrations onv the member in position to engage a roof. 4:1A. drill as in claim- 3, in which the annular race.
engaging member; is provided with abore and themeans.
5. A drillas-in claim 1, in which the twolast-named means includea common drive motor.
6; A drillk as in claim l, in which the roof-engaging, meniberis provideti'witli a. bore andthe means'to mount the roof engaging member on the annular member in 8: In a drill-as in claim 2, a plurality oicloscly spaced,
serrations: on the roof-engaging member, in. engagethe roof.
9. A drill. as, in claim, 2, in which theroofiengaging,
position to References Cited in the file of this patent UNITED STATES PATENTS 2,007,666 Smith July 9, 1935 10 Holmes July 19, 1938 Gardner, Jr. Apr. 9, 1940 Suzuki Dec. 10, 1940 Osgood Jan. 6, 1942 Possum Oct. 5, 1943 Karweit Apr. 15, 1947 Allen Apr. 14, 1953
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|U.S. Classification||173/34, 175/321, 91/469, 173/186, 175/173, 81/54, 405/259.1, 173/46, 173/150, 175/195|
|International Classification||E21D20/00, E21B7/02|