US3048850A

US3048850A - Universal stud driver

Info

Publication number: US3048850A
Application number: US799886A
Authority: US
Inventors: Arden L Schilling
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-03-17
Filing date: 1959-03-17
Publication date: 1962-08-14
Anticipated expiration: 1979-08-14

Description

Aug. 14, 1962 A. scHlLLlNG UNIVERSAL STUD DRIVER 2 Sheets-Sheet 1 Filed March 17, 1959 Aug. 14, 1962 A. SCHILLING UNIVERSAL STUD DRIVER Filed March 17, 1959 l 2 Sheets-Sheet 2 lNvENToR. :ifa/Wzl. Sc/ZZZ/y States This invention relates to explosively actuated tools, and more partic-ularly to those by which working elements are driven out of the barrel of a tool.

The invention more specifically relates to a gun type tool for impelling fastener projectiles, or studs for use in embedding bolts, or studs, or other fastening means into a solid mass such as concrete walls, or steel plates, or Wooden objects. The driving 'force for the projectile, or stud, is obtained by firing an explosive charge behind it. 'Ihe commercial known type tools operate satisfactorily to a degree, but every time a new stud is driven the tool has to be reloaded. This, of course, slows down the driving process and materially limits the number of studs that can be driven in any period of time.

It is therefore among the principal objects of the instant invention to provide -a light weight ltool Of the type referred to, a tool which co-ntains a plurality of working elements that can be driven in succession without intermediate reloading, which is easy to operate, which can readily be reloaded after all of the working elements have been expelled, and which is strong and durable.

It is another object of the present invention to provide a stud driver of the above type which employs No. 22, or No. 32 caliber shells for driving pointed studs.

It is still another object of the present invention to provide a twelve shot repeater stud driver which can be loaded or unloaded as quickly as the conventional single shot type.

It is a further object of the present invention to provide a stud driver which can be red with one hand as fast as pressure can be applied against the gun and wall, and trigger pulled, and wherein the stud driver cannot be fired unless the gun barrel is tight against the work.

With the above and other objects of the invention in view, the invention consists in the novel construction, arrangement and combination of various devices, elements and parts, as set 'forth in the following detailed description taken in connection with the accompanying drawings, in which:

FIGURE l is a longitudinal vertical sectional View, partly shown in elevation, of a preferred embodiment of the present invention;

FIGURE 2 is a transverse sectional view taken along the line 2-2 of FIGURE l;

FIGURE 3 is a transverse sectional view taken substantially along the 4line 3-3 of FIGURE 1;

FIGURE 4 is a transverse sectional view taken substantially along the line 4-4 of FIGURE -1;

FIGURE 5 is a side elevational view, shown partially in section, of the present invention shown in FIGURE 1, but showing the forward principal magazine part pushed inwardly t-o enable the firing pin to strike against the cartridge upon trigger release;

FIGURE 6 is a transverse sectional view taken on the line 6-6 of FIGURE 5;

FIGURE 7 is a transverse sectional view taken on line 7-7 of FIGURE 5; and

FIGURE 8 is a transverse sectional view taken on line 8--8 of FIGURE 5.

In carrying the invention into effect in one of the embodiments which has been yselected for illustration in the accompanying drawings and for description in this speciication, and referring now particularly to FIGURE 1, there is provided a gun for impelling fastener projectiles and which comprises a cylindrical sleeve 10 open at its atent ice forward end and provided at its closed end with a reduced extension sleeve 12 having a closed end. A `substantially rectangular shaped housing 13, open at its top and rear end, is mounted upon the sleeve 10 at the top thereof. The sleeve 10, FIGURES 1 and 5, is provided with a vertical aperture 14 ycomi-nunicatirig with the interior of said housing 13 for la purpose which will hereinafter become apparent. A chisel shaped finger 15, FIGURES 1 and 5, is mounted on the top of the sleeve 10 at the forward and open end thereof by means of the bolt 16.

A ball bearing assembly 17, FIGURE 5, is fixedly mounted within the closed end of the extension 12 and rotatably and resiliently mounts the index finger 18 with the inner race thereof. The index finger 18 embodies a rnain horizontal finger portion with an integral depending vertical finger portion 1-8 adjacent the forward free end (FIG. v5 The coil spring 19 is secured to the extension 12 at one end thereof and at the other end to the index finger 18. The finger 13 is held by Said spring 19 from moving in both directions, it can only move when it is withdrawn from an angular slot. An axially located guide shaft 20 is rotatably mounted within the ball bearing assembly 17 and extends forwardly -of the extension 12, as does the index finger 18.

A coil spring 22 is mounted within the sleeve 10 while an adjustable aligning pin '23 is fixedly mounted in the end wall 30 by lock nut 21, and extends forwardly within the central portion of the spring adjacent the lower portion thereof.

The end wall 30 is provided adjacent the upper portion thereof with a small circular opening 108 and bearing 109 therein which receives therethrough the firing pin 107.

A top handle bracket 25 is mounted at its forward end to the rear end of the top portion of sleeve 10 and at its rear end to the upper end of the handle grip 27, the lower end of the handle grip 27 being fixedly connected to the lower end portion of sleeve 10 by means of the lower handle bracket 26 (FIGURE 1). The handle grip 27 is provided with an elongated opening on its forward side and upper end portion, to slidably receive a trigger 113 which is normally pressed forward by a coil spring 114 suitably mounted horizontally within the handle grip 27 adjacent the upper end thereof. The forward end of the coil spring 114 is in pressing engagement with lthe rear side of the trigger 113 while the rear end of the coil is held in position against the interior Wall of said handle grip 27.

An angularly shaped cam member 29 is fixedly mounted with the handle bracket 25, depending therefrom.

A hollow cylindrical sleeve 31 having a closed end wall 32 is telescopically received within the sleeve 10 at its open rear end and is provided at its top inner end with an elongated slot 33.

A small cylindrical sleeve type bearing is screw threaded into the bottom portion of the end wall 32, the latter being provided with a threaded forward male end portion 116. A small cylindrical sleeve 34 closed at -its outer end is screw threaded onto the male portion of said bearing 115. A pawl 35 is mounted within the sleeve 34 and is spring urged inwardly by means of the coil spring 36 surrounding the same and the forward end of which abuts a collar portion -fixedly carried by the pawl.

The end wall 32 at the upper portion thereof is provided with the internally threaded opening 37.

Arc shaped retaining latches 38 and 39 are pivotally mounted at their lower ends on the end wall 32 below the opening 37 by means of the pins 40, the upper ends of the retaining latches being connected by a coil spring 41, arranged horizontally (FIGURE 6).

A bushing 43 is fxedly mounted .at one end within the internally threaded opening 37 and is provided with an inwardly extending set screw 45. A sleeve 42 is slidably mounted on the bushing 43 and is provided at its inner end with the opening 44 alignable with the set screw 45, the outer end of the sleeve 42 having an inwardly extending flange 117. A barrel 49 with longitudinal bore therein is received within the bushing 43 and is provided .at its inner end with an annular groove 46 which receives therein the inner end of set screw 45, the inner end of the barrel being chamfered. The inwardly extending ange 117 at the outer end of the sleeve 42 provides a spring chamber 47 which has positioned therein a coil spring 48, one end of which abuts the outer end of the bushing 43 and the other end abuts the inwardly extending flange 117 of the sleeve 42. The outer end of the barrel 49 is integrally formed with an enlarged cupshaped member 50 presenting an inner wall 51 and a muzzle 52.

A solid magazine 53 hereinafter referred to as a magazine, or breech cylinder, is rotatably mounted within the sleeve 31 and is provided with twelve spaced bores 55 having the enlarged frusto-conical forward ends 56 adapted to receive snugly therewithin the chamfered end of the barrel 49 as will hereinafter become clear. Each of the bores 55 connects at its inner end with the enlarged firing chambers 57; the forward end of the magazine 53 is provided with twelve V-shaped indentations 54, in radial alignment with the bores 55 and center line of the magazine, and therebetween, to act as ratchet teeth which are engaged by the pawl 35. The studs 61 to be driven are placed within the Ibores 55, as will be obvious. Cartridges 58 are placed within the ring chambers 57. The barrel 49 is slidable on the inside surface 60 of the bushing 43. The magazine 53 abuts the inner surface 62 of the end wall 32. Three guide pins 63 (FIGURE 3) are iixedly mounted in the cartridge ejectionY disc 73 and are received within corresponding bores 76 provided in the rear end of the magazine 53.

The magazine 53 is rotataby mounted upon the shaft 66 which is slidably positioned and extends through a suitable bore 68 in wall 32, said shaft being provided at its forward end with an enlarged externally knurled knob 64; a coil spring 65y sleeving the shaft 66 intermediate the knob 64 and .wall 32. The central rear end portion of the magazine is provided with a cylindrical chamber 71 in axial alignment with said bore 68 at the forward end thereof. The rear end portion of said shaft 66 is formed with an enlarged disc 70. The rear end of the shaft 66 is provided with a square extension'86. The disc 70 is surrounded by a ring 67, said ring forming a bearing with an external diameter equal to the internal diameter of said chamber 7'1, said ring being pinned to the disc 70 by pin 69. Said chamber 71 permits longitudinal movement of the disc 70 and ring 67 secured to said shaft 66. (FIGURE 1.) An ejector disc 73 with hub portion 74 is mounted `adjacent and upon the 4rear end portion of shaft 66, said hub 74 having an external diameter equal to the linternal diameter of said chamber 71 and rotatable and slidable therein. 'I'he hub 74 is in contact with circular disc or ywasher 75 spaced forwardly from the rear end of said shaft 66. The ejector disc 73, FIG. 3, vwith hub 74 being free upon said shaft 66, being spaced between the disc 70 and disc 75 and secured to pins 63 slidably mounted in bores 76 causes said ejector disc 73 to'be moved longitudinally by longitudinal movement of said shaft 66. The ejector disc 73 will rotate with rotation of magazine 53 because the guide pins 63 are mounted in bores 76 herein. The cartridges 58 placed within chambers 57 will have the inner side of their llange portions 77 abutting with the outer surface of the peripheral edge portion of said ejector disc 73, the periphery of said ejector disc 73 being provided with the twelve equally spaced semi-circular openings 78 which receive therethrough the rear ends of the cartridges 58. (FIGURE l.) Thus it is obvious that the hub 74 of the ejector disc 73 is received within the chamber 71 of the magazine and causes the ejector disc to extend rigidly and perpendicularly relatively to said shaft 66. The ejector disc 73 lits ilush within Athe relief portion in the rear surface of said magazine; the rear surface of said magazine adjacent its peripheral edge being provided with semi-circular portions 80 adjacent the tiring chambers 57, whereby said semi-circular openings 78 and Si) form flush, full circular openings at the rear ends of said firing chambers 57, to receive the entire inner surface of the annular flange 77 of said cartridges 58 (FIGURE 3).

A cylindrical drum 87 (FIGURE l) is positioned within the corresponding opening provided at the open end of the magazine and is formed with a central cam 88 of triangular shape (FIGURE 7) said cam being rotatably assembled within the drum 87 adjacent the flanged and spiral groove cylinder 90. Said cylinder has a reduced extending portion which receives therewithin the anged sleeve 91, which sleeve receives therein the guide shaft 20. The flange portion of cylinder 90` is rigidly assembled between the drum 87 and a circular disc member 92 having a central bore of internal diameter equal to the external diameter of the grooved cylinder 90. The cam 88 (FIGURE 7), is provided with the risers 89 and the wells 93. The drum 87 is provided with angularly spaced bores 85 which receive therethrough the locking pins 84 which sit radially around the cam 88 and are slidable within the openings 85. Coil springs 83 surround each of the pins `84 within the bores 85 and serve to normally urge the locking pins 84 against the cam S8. The front face of the drum 87 is provided with an annular channel 94 which receives therein in free relationship the rims 77 of the cartridges 58. The drum 87 is also provided with twelve iiring pin openings v`95 aligned longitudinally with each of the firing chambers 57; the openings 95 being enlarged at the rear end thereof to receive the coil springs 96 sleeving the firing pin extensions 97 between the drum `87 and the head 98 on the tiring pin extensions, said head 98 being tapered rearwardly to fit in twelve concave openings 99 terminating rearwardly in twelve smaller bores 186, in central disk member 92, large enough to receive the forward end 106 of the ring pin 187. The rear surface of the circular disc 92 is also provided with twelve openings 101 to receive the pointed end 102 of aligning pin 23 (FIGURE 8). The openings 10d are equally spaced radially between the bores 10i); the aligning pin is arranged fifteen degrees to the left side of the vertical plane and at the base of said wall 30 (FIGURE 4). The drum `87 is provided with the central cylindrical opening S2 which surrounds the cam 88, and the rear face of the drum 87 is indicated at 81 (FIG- URE 7). The grooved cylinder 90 is shown with grooves, or slots 79, in the grooved cylinder 90 to receive the depending vertical portion 18 of the index finger 18 (FIG- URES 1 and 5). Finger 18 with depending portion 18' is normally stationary while pressure is being applied to handle grip 27 to move the gun against an object. Therefore, when linger 18' is pushed into an angle slot, the iinger 18' forces the cylinder to turn counterclockwise as viewed by FIG. 8 and according to the relative positions thereof. However, when the finger 18 is withdrawn from the angular slot, the cylinder does not move in a clockwise direction because of pawl 35 being within one of the V-shaped in'dentations 54. The angular slots move lthe cylinder when the gun is moved against an object while nger 18 only rotates when removed from the angular slot when the gun is removed from an object.

The bell crank 118 is pivotally mounted within the housing 13 by means of pin 119 and is pivotally connected at its forward end to the latch pin 120 which passes downwardly through the suitable aperture 14 in the sleeve 10 and into the slot 33 of the sleeve 31. The rear end of slot 33 will form a stop means for said pin 120, thereby preventing sleeve 31 from being `removed from sleeve 1t) without the removal of said pin 129 from the slot 33. A link rod 121 is pivotalily connected at its forward end to the lower rear end of the bell `crank 118 and extends rearwardly on top of said sleeve and beneath a grooved plate 122 secured to said sleeve 10 by screw 123. The rear end of said rod 121 is pivotally connected to a lever 124 pivotally mounted at its rear end to a slotted depending arm v125 rigidly formed upon the base of thumb lever 126. A coil spring 127 is connected to the bell crank 1,18 at its forward end and at its rear end to the plate 122 mounted upon sleeve 10. The bracket 123 is xedly mounted on the handle bracket 25 and rotatably mounts the thumb lever `126 which is pivotally mounted on the pin 129, as will be obvious. Thus, upon depressing the thumb lever 126, the link rod 121 will move forwardly to rotate the bell crank 118 in a clockwise direction and raise the pin 120.

The trigger 113, slidably mounted within the opening 110 in the grip 27 is retained in the forward position by the return coil spring 114 positioned therein. (FIGURE 5.) The trigger 1113 is xedly mounted upon the rear end of the trigger rod 131B slidably mounted on the undersurface of the handle bracket 25. A bracket 131 is fixedly mounted on the forward end of the trigger rod 131i, said bracket being provided with a notch or groove between two longitudinally spaced tongues 132 extending downwardly below the horizontal support plate 133. Therefore the rod 130, bracket 131 with tongues 132 are actually one integral piece of structure. An L-shaped arm member 134 is pivotally mounted at its upper end within said notch and to said tongues `132 by pin 135. The horizontal leg 136 of said member 134 is normally parallel with the support plate 133 as the ver-tical leg 140 thereof rests in contact with an intermediate portion of the firing pin 107; this parallel arrangement is resiliently maintained by a coil spring i137 vertically maintained between the horizontal leg 136 and the support plate 133. The iring pin is provided with two cylindrical spacers 138 and 139 effecting a groove to receive the vertical leg j144B. A tiring pin bracket 142 is rigidly secured to the bottom of the handle bracket 25 directly beneath the grooved plate 122. Bracket 142 has a centrally located horizontal bore in the depending portion thereof to receive the rear end of said ring pin 167; allowing it to slide therethrough. A coil spring 141 surrounds the ring pin 107 intermediate the spacer 139 and bracket 142 biasing the pin 187 forwardly. The angularly shaped cam member `29 is secured to the handle bracket 25 and depending therefrom adjacent to, Ibut forward of said bracket 142. The cam member 29 has a horizontal larm portion `41 which extends forwardly therefrom. The `arm portion 41 has an upwardly and rearwardly formed cam surface 59. The lower surface of said horizontal leg 136 of bracket i134 is formed with a cam surface `154 extending rearwardly and upwardly. When the trigger 113 is moved rearwardly, the trigger rod 130 moves the bracket 131 rearwardly, whereby the cam surface 154 of leg 136 will contact and ride upon the cam surface S9 of arm 41, thereby causing the horizontal leg 136 to move upwardly towards the support plate 133 compressing spring 137 which action rotates the vertical leg 140 clockwise pulling the vertical leg 140 away from the spacers 138 and 139 upon the firing pin 107, allowing the pin 107 to move forwardly by compressed coil spring 4141, the cam surface of the bracket leg 136 rides on top of spring 141 until lthe trigger bar 130 is released, whereupon the leg 136 slides forwardly again on top of the spring 141 and drops iu between tongues 132 on the firing pin 107.

In operation of this gun type tool, twelve studs 61 are placed in the twelve bores 55, twelve shells 58 are placed to the rear of said studs 61 and within twelve tiring charnbers 57. The sleeves 10 and 311 are telescoped and secured together by pin 12() against rotation relative to each other allowing longitudinal movement therebetween. The cup shaped member Sil is placed against the surface of lthe material that a stud is to be driven into. Then the hand grip 27 is urged forwardly by the operator, depressing the coil spring 22 against the rear end of the sleeve 31 and the forward surface of the end wall 30, and causing the index finger 18 to ride into one of the grooves 79 of the cylinder 90 causing thereby the drum 87 to rotate the magazine 53 counterclockwise within the sleeve 31, since the drum 87 is locked in the rear end wall of the magazine by the locking pins 84. (FIGURE 7.) The rotation of the magazine 53 ceases when the index linger 18 reaches the point where the spiral of the cylinder 90 stops, and the aligning pin 23 slides into one of the guide openings 101 provided therefor (FIGURE 8). At this moment, one of the bores 55 in the magazine 53 is in alignment with the barrel 49 and the firing pin guide openings 95. The exact number of degrees of rotation necessary for this alignment is controlled by the twelve V-shaped indentations 54, pawl 35, and the degree of spiral in the groove 79 in cylinder 90. Also, when the hand grip 27 is urged forwardly with cup shaped member 50 against an object, the cylindrical sleeves 10 and 31 and the bushing 43 mounted in opening 37 in end wall 32 of sleeve 31, all move forwardly as a single unit, said bushing 43 slides forwardly between sleeve 42 and barrel 49 a distance equal to the width of the annular groove 46 in barrel 49 controlled by free end of set screw 45 and at the same time compresses the coil spring 48 in spring chamber 47, the iinger 15 (FIGURE 1) secured by the set screw 16 on the sleeve 10 forces open the retaining latches 38 and 39 which pivot about pins 40 (FJGURE 6) on the end wall 32, whereby the barrel 49 with its chamfered end surface is seated with one of lthe countersunk ends 56 of one of the bores 55 and making a gas tight seal therebetween. The forward movement of the hand grip 27 also urges the sleeve 10 forwardly, over the magazine upon compression of the coil spring 22, bringing :the closed end 12 closer to the magazine.

At this point, the stud 61 is ready to be driven by the expanding gas from the exploding cartridge 58.

As seen by FIGURES l and 5, to fire a cartridge, the trigger i113 is pulled against the retained coil spring 114 into the hand grip 27 which urges the trigger rod 130 rearwardly to which is attached the bracket y131 which pivotally mounts the L-shaped member 134, (F-IG. 4.) When the vertical leg 140 of mem-ber 134 moves rearwardly, it carries with it the spacers -138 and 139 upon the firing pin 107. In so doing, the coil spring `141 is co-mpressed against the bracket 142 which is securely fixed to the top handle bracket 25. When the trigger cam surface 54 on horizontal leg 136 reaches the cam surface 59 on cam member 29, it is carried up and away from the spacers 138 and 139 and thereby releasing the firing pin 107 which strikes the firing pin extension pin 97 (FIG- URE 5) which strikes the percussion cap center of the cartridge 58. The explosive gases therefrom drives the stud 61 through the bore 55 and then through the barrel 49 and out through the muzzle 52. The inner wall of the cup-shaped member 50 is a safety shield against discharged gases. The pressure on the handle grip 27 is then released and the coil spring 22 urges the sleeve 31 forwardly to its original position. The next cartridge may then be brought into the ring position by repeating the steps mentioned above.

To take the assembly apart (FIGURE l) depression of the thumb lever V126 which -being pivoted by pin 129 will urge the lever 124 forwardly which in lturn urges the link rod 121 forwardly, pivoting the bell crank 118 in a clockwise direction about the pin 1-19 and lifting the latch out of the elongated slot 33, to permit the sleeve 311 to -be removed from the sleeve 10. Lever 126, when released, will now return to its -pull up position due to the tension of the spring 127 attached at one end to the bell crank 118 and at the other end thereof to the fixed plate 122 upon sleeve 10.

As shown by FIGUR-ES 1 and 5, the drum 87 is removed from within the rear cavity of the magazine 53 by turning the knurled knob `64 in either direction, this turns the cam 88 on the shaft `66 and allows the locking pins 84 (FIGURE 7) normally urged against the risers I89 on lthe cam by coil springs S3 to fall into the wells 93 thereby unlocking the drum 37 and the magazine y53. After removing the drum 87, the knurled knob 64, when pushed inwardly, causes the ejector idisc 73 to move outwardly with the spent cartridges which can be easily removed and new ones inserted in their places. When the knob 64 is released, the coil spring 65 will return it to its original position. To lock the `drum 87 into the magazine 53, it is only necessary to turn the knob 64 yuntil the locking pins 84 are against the high points 89 `of the cam 88 and they will extend into openings 145 in :the magazine 53.

To return the sleeve 3i into the sleeve 110, the lever 126 is pressed down thereby lifting latch pin "120, permitting the slot 33 to be aligned with thelatch pin v1201, whereupon by release of the lever 126, the pin 120 will it into the slot 33, thereby locking the sleeve 31 into the sleeve 10.

It should now be apparent that there has been provided a twelve shot repeater stud driver which shoots either 22 or 32 caliber shells. It will also be apparent that it can be loaded or unloaded as quickly as the conventional single shot type and can be fired with one hand as fast as pressure can be exerted against the gun and wml and the trigger pulled. It will also be apparent that it cannot be fired unless the gun barrel or guide member 56' is tight against the work.

4If 22 caliber shells are used, they wvill be provided with inserts which t into the magazine bores 55.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. An automatic tool for driving pointed studs comprising, in combination, a rear cylindrical casing open at its forward end and closed at its rear end, a front cylindrical casing slidably and telescopically received within the forward open end of said rear casing, the rear end of said front casing being open and the forward end thereof closed, releasable means mounted upon said rear casing for limiting the longitudinal travel of said rear casing on said front casing, a magazine rotatably mounted in said front casing, said magazine having a plurality of angularly spaced longitudinally extending bores for receiving pointed studs therein, each of said bores having an enlarged rear end portion for receiving cartridges therewithin, said releasable means being manually operable to release and permit removal of said front casing from within said rear casing for loading the pointed studs and cartridges in Said bores of said magazine, a bushing rigidly assembled within a bore at the forward closed end of said front casing having a longitudinal bore in communication with the interior of said front casing, a barrel having an enlarged contact member at its forward end and a longitudinal bore therein movably assembled within said bushing for longitudinal movement therein whereby the rear end of said barrel will register with one of said bores in said magazine and adapted to receive the studs forced therethrough, spring operated locking means to prevent movement of said barrel relative to said front casing, means to open said locking means when said contact member of said barrel is in contact with an object and allow movement of said barrel rearwardly relative to said front casing, index means for rotating said magazine to bring one of its bores into axial alignment with said bore of said barrel operable upon the telescoping movement of said casings toward and relative to each other, handle means carried by the rear casing, and manually operable firing pin means associated with said handle for discharging cartridges within the said magazine bore aligned with the bore of said barrel whereby the explosive gases of said discharged cartridge will force a pointed stud outwardly from the said bore of said magazine through the said bore of said barrel when the contact plate of said barrel is in contact with an object and said barrel is in its rearmost location relative to said casing.

' 2. An automatic stud driver according to claim l, said means for rotating said magazine to bring a stud into alignment with said barrel means comprising a drum, the rear end of said magazine having an enlarged bore receiving said drum therewithin, releasable means for retaining said drum within said magazine enlarged bore, a forward face of said drum having an annular opening receiving therewithin the rim flanges of the cartridges, said drum having a firing pin opening extending therethrough in communication with each of said enlarged cartridge receiving bores, a rearwardly extending centrally located cylinder with spiral grooving on the rear face of said drum extending into said first casing within said spring means urging said first and second casings apart, a hollow rearwardly centrally located portion connected to said shaft, a rear casing extension at the rear closed end of said rear casing, the rear end of said extension being Closed, ball bearing assembly means within the closed rear end of said extension, a forwardly extending guide pin mounted at the center of said ball bearing assembly means and ladapted to be received within said hollow extension, and a forwardly extending finger with a depending portion mounted within said bearing assembly and adapted to be received within the grooves of said grooved shaft whereby to rotate the same upon forward motion of said finger and spring means at the rear end of said hollow extension for retaining said depending finger portion within the grooves of the grooved shaft, said drum on the rear face thereof having a forwardly extending guide opening and a guide pin fixedly carried by the rear wall of said rear casing ladapted to be received within said guide opening upon forward movement of said rear casing.

3. An automatic stud driver according to claim l, said barrel means comprising a forwardly extending male member 'with a threaded male rear end frxedly mounted lat its rear end within a threaded female bore in the upper central portion of said front casing closed end and communicating with said magazine, said barrel slidably and resiliently positioned within said bushing, said barrel and said enlarged contact member adapted to enclose the work area where the stud is being driven and to prevent the escape of gases, a sleeve surrounding said bushing and extending outwardly therefrom and terminating at its outer end in an inwardly extending ange abutting said enlarged contact member and providing a spring chamber therewithin, a coil spring sleeving said barrel intermediate the outer end of said bushing and said flange, the inner end of said barrel being beveled, the forward end of said stud receiving bores being countersunk and adapted to receive said beveled yend therewithin to form a gas-tight seal when said bushing is moved forwardly relative to said barrel against the action of said spring, said locking means comprising a pair of semicircular retaining latches pivotally mounted on the closed front end of said front casing and surrounding said bushing, said bushing having an angular groove adapted to receive said retaining latches therewithin, spring means connected to the upper ends of said retaining latches and urging the same together Whereby to prevent the forward movement of said bushing relative to said barrel, and a forwardly extending linger carried by the forward open end of said rear casing adapted to separate said spring latches and to permit the movement to seat said barrel into said countersunk openings.

4. In an explosive actuated tool, for use in driving a fastening stud into a solid mass comprising, in combination, a first hollow, cylindrical casing open iat its fonward end and closed at its rear end, a second hollow cylindrical casing slidably and telescopically received within the forward open end of said first casing, the rear end of said second casing being open and the forward end thereof closed, means for limiting the longitudinal movement of said first casing relative to said second casing comprising a latch pin extending between said casings and being pivotally secured to said iirst casings and slidable between normal and retracted extreme stations corresponding to and defining said assembled and retracted positions of said casings, said latch pin being releasable to permit removal of said second casing from said iirst casing, positive means to release said latch pin from contact with one of said casings, resilient means to maintain said latch pin in normal position to lock said casings movably together, a magazine rotatably mounted in said second Casing, said magazine having a plurality of angularly spaced, longitudinally extending bores for receiving the studs therewithin, each of said bores at its rear being enlarged for receiving cartridges therewithin, a bushing assembled at the forward closed end of said second casing having la longitudinal bore therein adapted to receive the studs therethrough, a barrel having an enlarged contact member at its forward end and a longitudinal bore therein movably assembled Within said bushing for longitudinal movement of said bushing thereover, whereby the forward end of one of said longitudinally extending bores in said magazine can be moved into registration. with the inner end of said barrel, spring operative arc shaped latches pivotally mounted upon the vertical wall of said second casing to normally prevent movement of said bushing over said barrel, means mounted upon said second casing to move said latches apart relative to each other when said contact member of said barrel is in contact with an object and pressure is applied to said rst casing toward said barrel, means lfor rotating said magazine to bring one of its bores into alignment with the bore of said barrel operable upon movement of said casings relative to each other, spring means for retaining said casings in normal extended position, handle means carried by the rear end of said rst casing for urging the same forwardly and operating said magazine rotating means, ratchet means for controlling the movement of said magazine bringing one of its said bores into alignment with the bore of said barrel, and manually operable firing pin means for discharging cartridges within the said magazine bore aligned with the bore of said barrel.

5. An automatic tool for driving pointed studs comprising, in combination, a rear cylindrical casing open at its forward end and closed at its rear end, a front cylindrical casing slidably and telescopically received within the forward open end of said rear casing, the rear end of said front casing being open and the forward end thereof closed, releasable means mounted upon the rear casing for limiting the longitudinal travel of said rear casing on said front casing, said releasable means comprising a bell crank pivotally mounted on the top of said rear casing, said front casing having an enlarged slot at the rear top portion thereof, said bell crank above and in vertical alignment with said slot, a latch pin extending downwardly through an opening in said rear casing and into said slot, the closed end of said slot restricting the travel of said pin in said slot and aiecting the travel of said rear casing on said front casing, a magazine rotatably mounted in said front casing, said magazine having a plurality of angularly spaced longitudinally extending bores for receiving pointed studs therein, each of said bores having an enlarged rear end portion for receiving cartridges therein, said releasable means being manually operable to release and permit removal of said front casing from within said rear casing for loading the pointed studs and cartridges in said bores of said magazine, a bushing rigidly assembled within a bore at the forward closed end of said front casing having a longitudinal bore in communication with the interior of said front casing, a barrel having an enlarged contact member at its forward end and a longitudinal bore therein movably assembled Within said bushing for longitudinal movement therein whereby the rear end of said barrel will register with one of said bores in said magazine and adapted to receive the studs forced therethrough, spring operated locking means to prevent movement of said barrel relative to said front casing, means to open said locking means when said contact member of said barrel is in contact with an object and allow movement of said barrel rearwardly relative to said front casing, index means for rotating said magazine to bring one of its bores into axial alignment with said bore of said barrel operable upon the telescoping movement of said casing toward and relative to each other, handle means carried by the rear casing, and manually opera-ble tiring pin means associated with said handle for discharging cartridges within the said magazine bore aligned with the bore of said barrel whereby the explosive gases of said discharged cartridge will force a pointed stud outwardly from the said Ibore of said magazine through the said bore of said barrel when the contact plate of said barrel is in contact with an object and said barrel is in its rearmost location relative to said casing.

6. An automatic tool for driving pointed studs comprising, in combination, a rear cylindrical casing open at its forward end and closed at its rear end, a front cylindrical casing slidably and telescopically received within the forward open end of said rear casing, the rear end of said front casing being open and the forward end thereof closed, releasable means mounted upon the rear casing for limiting the longitudinal travel of said rear casing on said front casing, a magazine rotatably mounted in said front casing, said magazine having a plurality of angularly spaced longitudinally extending bores for receiving pointed studs therein, each of said bores having an enlarged rear end portion for receiving cartridges therein, said releasable means being manually operable to release and permit removal of said front casing from within said rear casing for loading the pointed studs and cartridges in said bores of said magazine, a bushing rigidly assembled within a bore at the forward closed end of said front casing having a longitudinal bore in communication with the interior of said front casing, a barrel having an enlarged contact member at its forward end and a longitudinal bore therein movably assembled within said bushing for longitudinal movement therein whereby the rear end of said barrel will register with one of said bores in said magazine and adapted to receive the studs forced therethrough, spring operated locking means to prevent movement of said barrel relative to said front casing, means to open said locking means -when said contact member of said barrel is in contact with an object and allow movement of said barrel rearwardly relative to said front casing, index means for rotating said magazine to bring one of its -bores into axial alignment with said bore of said barrel operable upon the telescoping movement of said casing toward and relative to each other, handle means carried by the rear casing, and manually operable firing pin means associated with said handle for discharging cartridges within the said magazine bore aligned with the bore of said barrel whereby the explosive gases of said discharged cartridge will force a pointed stud outwardly from the said bore of said magazine through the said bore of said barrel when the contact plate of said barrel is in contact with an object and said barrel is in its rearmost location relative to said casing, said handle means comprising an upper handle bracket secured to and extending rearwardly from the top portion of said rear casing, a lower handle bracket secured to and extending rearwardly from the lower portion of said rear casing, and a hand grip connecting said upper and lower handle brackets, and said ring pin means comprising said hand grip at the upper end thereof having a horizontal recess therethrough, a trigger member slidable within said bore and rearwardly, spring means for retaining said trigger member in the forward position, a trigger rod connected to said trigger member and extending forwardly therefrom for sliding movement on the undersurface of said upper handle bracket, and the rear end `of said rear casing having an opening, a firing pin slidable through said opening, a guide bracket depending from said upper handle bracket and slidably receiving therethrough the rear end of said [firing pin, a forwardly extending cam member xedly mounted with said handle bracket rearwardly of said rear casing end wa1l,la spacer collar on the forward end portion of said firing pin, a coil spring sleeving said firing pin intermediate said guide bracket and the rearmost of said spacer collar, and a bracket mounted on the undersurface of said trigger rod and pivotally mounting a latch member adapted to engage the upper end of said forwardly extending cam, spring means for retaining said latch member in engagement with the upper end of said forwardly `extending cam, and said cam member xedly mounted with said handle bracket adapted to release said latch member upon drawing said trigger member rearwardly.

References Cited in the le of this patent UNITED STATES PATENTS Pranke OCt. 14, 1890 Seidenbecker Mar. 19, 1912 R. Temple Jan. 18, 1921 Richmond et al. Apr. 26, 1932 Temple May 17, 1949 Massacrier Mar. 29, 1960 FOREIGN PATENTS Germany July 19, 1956 Germany July 25, 1957