US3679118A

US3679118A - Powder charge-operated bolt setter for securing exothermic plates on chill molds

Info

Publication number: US3679118A
Application number: US54365A
Authority: US
Inventors: Elmar Maier; Herbert Rangger
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 1969-07-18
Filing date: 1970-07-13
Publication date: 1972-07-25
Anticipated expiration: 1989-07-25
Also published as: FR2051849A1; GB1262443A; DE1936740C3; DE1936740B2; CA942003A; SE394387B; FR2051849B1; DE1936740A1; SU455522A3; JPS5031987B1; AT310106B

Abstract

A powder charge-operated bolt setter is formed with a reduced axial length for effectively securing exothermic plates on chill molds. In the casing of the bolt setter a percussion pin and a barrel are arranged in spaced parallel relationship and a lever situated within the casing to be pivoted by the percussion pin against a firing pin aligned with the rear end of the barrel for exploding cartridges held in a magazine which is guided in a stepwise manner through the casing. A release bar extends perpendicularly from the casing and is arranged in operating relationship with the percussion pin so that the firing action can be initiated at a position remote from the casing.

Description

United States Patent Maier et al. 1 July 25, 1972 541 POWDER CHARGE-OPERATED BOLT 56 References Cited 25 33: 0R SECURING UNITED STATES PATENTS Moe-IDS RWC PLATES ON CHILL 3,024,666 3/1962 Hoskell et al. ..227/l0 X 1 2,316,112 4/1943 Temple, Jr ..227/9 3,368,730 2/1968 Bayer ..227/8 [72] Inventors: Elmar Maier, Feldkirch-tisis; Herbert 3,482,753 12/1969 Bayer et al... ....227/10 Rangger, Frastanz, both of Austria Primary Examiner-Granville Y. Custer, Jr. [73] Assignee: Hllti Aktlengesellschaft, Schann, Fuersten- Atmmey-Mcclew and Tore" tum, Liechtenstein [57] ABSTRACT [22] Filed: July 13, 1970 A powder charge-operated bolt setter is formed with a reduced axial length for effectively securing exothermic plates 2| A L N on chill molds. 1n the casing of the bolt setter a percussion pin 1 pp 0 54,365 and a barrel are arranged in spaced parallel relationship and a lever situated within the casing to be pivoted by the percussion pin against a firing pin aligned with the rear end of the barrel 1 Foreign Application Priority Data for exploding cartridges held in a magazine which is guided in a stepwise manner through the casing. A release bar extends July 18, 1969 7 Germany ..P 19 36 740.9 perpendicularly from the casing and is arranged in operating relationship with the percussion pin so that the firing action [52] 0.8. CI... ..227/ 10 can be initiated at a position remote from the casing [51] Int. Cl ..B25c 1/14 [58] Field 01 Search ..227/8, 9, 10, l 1 9 Claims, 4 Drawing Figures mam-10mm m2 3.679.118

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POWDER CHARGE-OPERATED BOLT SE'I'IER FOR SECURING EXOTI'IERMIC PLATES ON CHILL MOLDS SUMMARY OF THE INVENTION The present invention is directed to a powder chargeoperated bolt setter for securing exothermic plates on chill molds and, more particularly, it is concerned with an arrangement for reducing the overall length of the bolt setter. Further, the bolt setter is arranged so that it can be remotely fired.

Bolt setters have been available which, instead of a handle, have used a supporting or extension device arranged on the longitudinal axis of the bolt setter and containing a remote firing mechanism for firing cartridges. Such bolt setters have a total length of 270 to about 350 mm. Since the width of chill molds with a capacity of 0.5 to 1.5 t is between 200 and 300 mm, and the thickness of the plates used in such molds is about mm, the inside width in such molds may be only about 170 mm. Because of these conditions, the bolt setters previously available could be used only for securing exothermic plates on chill molds with a capacity of more than 1.5 t which have an inside width of more than 300 mm.

Therefore, the primary object of the present invention is to provide a bolt setter of a reduced axial length so that it is possible to use it in securing exothermic plates in small molds.

Therefore, in accordance with the present invention, the shortest possible overall length of the bolt setter is achieved by arranging a percussion pin in substantially parallel spaced relationship with a firing pin which is aligned with the barrel and by displacing the percussion pin in the direction opposite to the firing direction against a lever member which actuates the firing pin for exploding a cartridge and driving an anchoring member from the barrel of the bolt setter.

Since the percussion pin is not arranged coaxially with the barrel, but rather is disposed in parallel relationship with it, the energy for actuating the firing pin is conducted through a lever which extends transversely of the barrel. The bolt setter can be shortened by the entire length of the percussion pin and by the path required for cocking the firing pin. As a result, the length of the bolt setter is limited to the length of the barrel, the length of the firing pin, and the dimension of the member which actuates the firing pin measured in the axial direction of the barrel so that an extremely short device is obtained which is capable of fastening exothermic plates in very small chill molds.

Further, in accordance with the present invention, the barrel is axially displaceable within the casing of the bolt setter in a known manner and a recess is provided in the barrel wall which is engaged by an extension on the member which releases the percussion pin after the barrel has been displaced against a spring loading so that the percussion pin can be released. The cooperation of the recess in the barrel and the member for releasing the percussion pin affords a simple safety device, since the percussion pin can bereleased only when the barrel has been retracted to a point that the end of the release member can seat within the recess in the barrel.

Another characteristic of the present arrangement is the provision of a magazine chamber within the bolt setter so that cartridges contained in a magazine can be positioned automatically in a stepwise manner for insertion into a cartridge chamber aligned with the barrel.

In operating the bolt setter, a hand-operated shifting element is arranged in the casing and consists of a multiple-arm lever with one arm in operative engagement with a feed lever for the cartridge magazine, another arm engageable with a shoulder on the percussion pin and still another arm for operative engagement with a lug on the barrel so that a single shifting movement effects the positioning of a cartridge in alignment with the barrel, the cocking of the percussion pin-firing pin arrangement, and the positioning of the barrel for the firing operation. This arrangement has the advantage that the person operating the bolt setter and standing on the narrow mold edge has to perform a minimum of manipulations during the loading and firing operations. Because of the shifting elethere is illustrated and described a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal view, partly in section, of a bolt setter incorporating the present invention;

FIG. 2 is a view, 'partly in section, taken along the line lI-Il in FIG. 1;

FIG. 3 is a view, partly in section, taken along the line III- III in FIG. 1; and

FIG. 4 is a side view of a portion of the device shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION In FIG. 1, a bolt setter l is shown having a casing 2 which contains an axially extending barrel guide bore 3 and a percussion pin guide bore 4 disposed in spaced parallel relationship with one another. Though the percussion pin guide bore 4 is not disposed directly above the barrel guide bore 3, as can be noted in FIG. 2, they are shown in the same plane in FIG. 1 for sake of simplicity. A barrel 5 is positioned for axial displacement within the barrel guide bore 3. At its forward end, that is the end facing in the firing direction, the barrel 5 has a front end piece 50 into which an anchoring element guide 7 is threaded. The anchoring element guide 7 is biased in the firing direction by a spring 6. Positioned within the anchoring element guide 7 is a washer 8 disposed about the forward end of a nail 9 arranged for securing an exothermic plate onto a chill mold. The guide 7 is secured within the casing 2 by means of a stop screw 10.

Within a centrally arranged bore 5b in the barrel 5, an axially displaceable hammer piston 11 is located with its rearward end 11a guided in the bore 5b of the barrel and its forward end 1 lb, which is of a smaller diameter than its rear end, is guided in a bore 7a of the anchoring element guide 7. The bore 7a is in axial alignment with the bore 5b. At the rearward end 5c of the barrel 5 a cartridge chamber 5d is provided in alignment with the bore 5b. As shownin FIG. 1 a cartridge 12 positioned in a cartridge magazine 13, is aligned rearwardly of the cartridge chamber 5d. The casing 2 forms a magazine channel 14 which extends transversely of the axis of the barrel 5.

Within the percussion pin guide bore 4, a percussion pin 16 is mounted for axial displacement in a direction opposite to the driving or firing direction of the bolt setter and the pin is biased in the rearward direction by a compression spring 15 which bears against a collar 16a on the pin and its other end is in contact with a screw 17 which forms a closure for the forward end of the guide bore 4.

Intermediate its ends, the percussion pin 16 has a frustoconically shaped surface 16b whose surfaces converge inwardly in the firing direction of the bolt setter. The base of the frustoconical surface 16b serves as a stop surface for a pin 18 which retains the percussion pin in the cocked position, note the dashed line between the collar 16a and the frustoconical surface 16b. Rearwardly of the base 160 a collar 16d is formed on the percussion pin against which a shifting element is operative for moving the percussion pin into its cocked position. In transfering the energy from the percussion pin I6 to a firing pin 22, arranged substantially coaxial with the barrel 5, a two-arm rocking lever 23 is pivotally secured within the casing with one arm aligned. rearwardly of the percussion pin 16 and the other arm aligned rearwardly of the firing pin 22. The rocking lever 23 is shown in the starting position in operative connection both with the percussion pin and the firing pin. The firing pin is urged in the rearward direction by a spring 24. Considering the relative positions of the percussion pin 16 and the barrel as shown in FIG. 2 it will be appreciated that the rocking lever 23 is positioned in an inclined plane, however, for sake of simplicity in illustrating the invention it is shown in the longitudinal sectional plane through the barrel.

As indicated in FIG. 1, a tubular extension member 26 is secured at its lower end to the casing above the percussion pin and extends upwardly away from the casing with its axis disposed normal to the axis of the barrel 5 and the percussion pin 16. In the bore 260 of the tubular extension member 26, a release bar 28, resiliently biased by a spring 27, has its lower or front end 28b arranged to cooperate with a recess 5e on the barrel, as shown in FIG. 1 the front end 28b is offset slightly to the rear of the recess 5e.

To facilitate the insertion of the cartridge magazine 13 into the casing and to ensure that the magazine is stopped during its stepwise passage through the magazine, the bolt setter l is provided with a rail 29 which extends upwardly from the casing in the same direction as the tubular extension member 26.

In FIG. 2, the lower end 28b of the release bar 28 is offset from the axis of the bar and a conically tapered surface 28c extends from the front end 28b rearwardly to a position adjacent the junction of the lower end of the member 26 and the casing 2. In the conical transition range of the release bar and extending therefrom into the offset end piece 28b is a slot 28d through which one end 18a of the pin I8 extends. As indicated in the dashed lines in FIG. 1 the end 18a of the pin 18 extends into the range of the percussion pin 16. The end 18a of the pin 18 is of a smaller diameter than the remainder of the pin and a conical transition surface 18b extends between the end 180 and the remainder of the pin 18. The pin 18 is guided within a bore 30 and its opposite end is in contact with a spring 31. The conical surface 18b is in juxtaposed relationship to the tapered surface 280 of the release bar 28. The spring 31 biases the pin 18 in the direction of the percussion pin 16 and the bore 30 is closed by a screw 32 against which the spring 31 bears.

The barrel 5, through which the hammer piston 11 is guided has a guide member 33 which projects outwardly through a slot 34 in the casing 2.

In FIG. 3 the cartridge magazine 13 is shown extending downwardly for aligning individual cartridges 12 with the cartridge chamber 5d. For positioning the cartridge magazine 13 in a stepwise manner an angle lever 35 is positioned within the casing and has an angularly bent lower end 35a which extends through a slot 36 in the easing into the magazine channel 14 and there engages one of the longitudinally spaced recesses 130 formed along the edge of the cartridge magazine 13. At its opposite end 35b, the angle lever is secured on a pin 35c arranged within a slot 37a of a shift lever 37 to which an actuating element 38 is attached. In the angle lever 35 adjacent the pin 35: a slot 35d is formed through which a screw 41 secures the lever 35 to the casing 2 and, in addition, serves as a support for the spring 42 which urges the lever 35 against the casing.

In addition, in FIG. 3 a handle 43 is shown on the upper end of the tubular member 26 and the free end 28a of the release bar 28 is guided within the handle so that the release bar can be pressed downwardly for firing a cartridge and ejecting an anchoring element from the bolt setter.

In FIG. 4 the switching or shift lever 37 is shown rotatably mounted on a pin 45 and biased into position by means of a spring 46. The switching lever 37 has a plurality of arms which cooperate with the various parts of the bolt setter in effecting its operation. The arm 37b of the lever 37 has a slot 37a through which the pin 356 of the angle lever extends. When the shift lever 37 is pivoted in the direction of the arrow f, the angle lever 35 by virtue of the position of the pin 350 within the slot 37a is pressed downwardly with its end 35a in engagement within a recess 13a so that the magazine cartridge 13 is advanced, in a stepwise fashion, one cartridge position through the cartridge chamber. Another arm 370 of the shift lever 37 is in operative engagement with the collar 16d of the percussion pin and displaces the percussion pin in the firing direction as it is cocked. Still another arm 37d of the shift lever is in operative engagement with the guide member 33 of the barrel 5 which extends through the slot 34 in the casing so that the barrel can be released in the event it is jammed within the casing. The shifting action of the lever 37 is achieved by means of the actuating element 38 which is secured to another arm 37e on the lever. As indicated by the arrow f, mentioned above, the actuating element 38 pivots the lever 37 about the pin 45.

In operating the bolt setter 1, described above, a washer 8 and nail 9 assembly is inserted into the nail guide 7 with the washer positioned at the forward or firing end of the device. To prepare the bolt setter for firing the nail 9, the actuating element 38 secured to the arm 37c of the shift lever 37 is turned in the direction of the arrow f so that the lever is pivoted about the pin 45 in the same direction. During its pivotal movement the lever effects a number of operations in readying the bolt setter for firing. The arm 37b of the lever 37 moves downwardly, as viewed in FIG. 4, and presses the angle lever connected to it by means of the pin 35c in the downward direction. Due to the angularly bent lower end 35a of the angle lever 35 which engages one of the recesses 13a of the cartridge magazine, as the angle lever is moved downwardly it advances the cartridge magazine a sufficient distance through the magazine channel 14 so that the previously exploded cartridge is displaced from alignment with the cartridge chamber 5d and the next live cartridge is axially aligned with the cartridge chamber for effecting the firing action. Further, as the shift lever 37 pivots, its arm 37c contacts the rearwardly facing surface of the collar 16d of the percussion pin and moves the percussion pin in the driving or firing direction of the bolt setter until the pin 18, note FIG. 2, is moved over the conical surface 16b of the percussion pin and the reduced cross sectional area end 18a of the pin 18 is seated against the face 16c at the large diameter end of the conical portion 16b and holds the percussion pin against the force of spring 15 which biases it in the direction opposite to the firing direction. The pin 18 is urged in the direction of the percussion pin 16 by means of the spring 31 located within the bore 30. Additionally, another arm 37d of the shift lever 37 is also pivoted in the firing direction and comes into contact with the guide 33 which extends laterally from the barrel into the slot 34, note FIG. 4. The action of the arm 37d against the guide 33 assures the advance of the barrel if it is jammed within the casing. However, if the barrel 5 is not jammed it is moved by the spring 6 into position for effecting the firing or driving operation. When the various displacement movements of the shift lever 37 have been completed, the actuating element 38 is released and the spring 46 returns the shift lever back to its original or starting position and the bolt setter l is now loaded and cocked ready for firing the nail 9.

The bolt setter l is positioned against an exothermic plate to be secured onto a chill mold with the forward end of the nail guide pressed against the surface of the plate. In accordance with the conventional safety feature of this type of device, the nail guide 7 and the barrel 5 are depressed in the direction opposite the firing direction and the cartridge chamber 5d is displaced rearwardly over the cartridge 12 which was moved into position by the action of the shift lever 37 and the angle lever 35. In this compressed position of the nail guide and barrel the recess 5e of the barrel is moved rearwardly from the position shown in FIG. 1 until it is aligned below the offset end 28b of the release bar 28. Accordingly, when the upper free end 28a of the release bar is pressed downwardly its offset end 28b can enter into the recess 5e and due to the downward movement of the release bar 28 its tapered surface 28c contacts the conical face 18b of the pin 18 and the pin is retracted against the force of spring 31 so that the reduced cross sectional area end 18a of the pin 18 is released from the face 16c of the percussion pin whereby the percussion pin is free to move in the direction opposite to the firing direction of the bolt setter. With the percussion pin released, it is driven rearwardly by the spring and strikes the upper portion of the rocking lever 23, as shown in FIG. 1, and this lever, in turn, is pivoted and strikes the firing pin 22 which fires the cartridge 12 positioned within the cartridgechamber 5d. When the cartridge is fired or exploded it generates propellant gases which drive the hammer piston 11 in the driving direction and the nail 9 is driven forwardly from the bore 711 of the nail guide 7 through the exothermic plate into the chill mold.

After the nail has been inserted, the bolt setter l is removed from the plate-which it secured to the mold and the barrel 5 and nail guide 7 are biased by the spring 6 in the firing direction of the device until the nail guide 7 bears against the stop screw 10. During the forward movement of the barrel 5, the cartridge chamber 5d is displaced away from the exploded cartridge 12 which remains in the magazine l3 and the bolt setter is ready for another firing cycle.

We claim:

l A powder charge-operated bolt setter for remotely inserting anchoring elements, such as in applying exothermic plates on chill molds, includes a casing, said casing, said barrel having an axially extending bore therethrough with a cartridge chamber formed at one end thereof, a hammer piston located within the bore of said barrel for free axial displacement therethrough, an axially displaceable spring loaded percussion pin located within said casing, and a firing pin arranged to be displaced by said percussion pin for firing a cartridge located within said cartridge chamber, wherein the improvement comprises said percussion pin is spaced laterally from and in parallel relationship with the bore through said barrel, said percussion pin being coextehsive for a portion of its length with said barrel, said percussion pin having a first end located adjacent to and spaced laterally from said firing pin and a second end spaced more remotely from said firing pin, means for holding said percussion pin in the cocked position, means for axially displacing said percussion pin opposite to the firing direction of said barrel when it is released from its cocked position, means arranged in operative engagement with the first end of said percussion pin and said firing pin so that by releasing said percussion pin from its cocked position for displacement opposite to the firing direction of said barrel said means displaces said firing pin in the firing direction for exploding a cartridge anddisplacing said hammer piston axially through said barrel in the firing direction, said barrel having a recess in its outer surface,

means arranged for effecting remote firing of the bolt setter comprising a support member fitted to and extending outwardly from said casing substantially normally to the axial direction of said barrel therein, an elongated release bar in parallel relationship with and supported by said support member and being displaceable relative to said support member in its elongated direction, said release bar having one end positioned within said casing and being displaceably positionable within the recess in'said barrel and its other end positioned remotely from said casing so that by displacing said release bar at its other end inwardly toward said barrel, said release bar effects the release of said percussion spring from its cocked position so that the bolt setter canbe fired.

2. A powder chargeoperated bolt setter, as set forth in claim 1, wherein said support member is a tubular member, said release bar located within said tubular member, and a spring member located within 'said tubular resiliently biasing said release bar in the directionaway from said barrel in said casing.

3. A powder charge-operated bolt setter, as set forth in claim 2, wherein the end of said release bar positioned within said casing has an axially elongated slot formed therein, the portion of said release bar containing said slot having at least one tapered surface converging toward'the adjacent endof said release bar, said means for holding said percussion pin'in the cocked position comprising a spring loaded pin located a barrel positioned within member forwithin said housing and extending through the slot in said release bar for engagement with said percussion pin, said tapered surface of said release bar arranged to contact a tapered surface on said spring loaded pin and to displace said pin from engagement with said percussion pin when said release bar is displaced axially in the direction of said barrel.

4. A powder charge-operated bolt setter, as set forth in claim I, wherein said casing forming a magazine channel therethrough rearwardly of said barrel and perpendicularly intersecting the axis of said barrel, a cartridge magazine arranged to be positioned within said magazine channel, and guide means secured to said casing for guiding said cartridge magazine into said magazine channel, said cartridge magazine arranged to be held by said guide means and to be advanced through said magazine channel in a stepwise manner, said cartridge magazine having a plurality of recesses along an edge thereof spaced in the longitudinal direction for cooperating in the stepwise movement of said cartridge magazine.

5. A powder charge-operated bolt setter, as set forth in claim 4, wherein means located within said casing and arranged to be disposed in cooperating relationship with said cartridge magazine said percussion pin and said barrel for advancing said cartridge magazine in a stepwise manner through said magazine channel for cocking said percussion pin by displacing it axially in the firing direction of the bolt setter and for axially displacing said barrel in the, firing direction in the event it is jammed within said casing.

6. A powder charge-operated bolt setter, as set forth in claim 5, wherein said meansdisposed in cooperating relationship with said magazine said percussion pin and said barrel comprising a switching lever pivotally mounted in said casing, means for effecting the stepwise movement of said cartridge magazine through said cartridge channel, said lever having a plurality of angularly spaced arms thereon and comprising a first arm arranged in operative engagement with said means for advancing said magazine cartridge in a stepwise manner, a second arm in operative engagement with said percussion pin for displacing said percussion pin in the firing direction, a third arm arranged to engage said barrel for displacing it in the axial direction, and a fourth arm, an actuating element attached to said fourth arm for pivoting said switching lever and for effecting the cooperating action with said magazine, said percussion pin, and said barrel.

7. A powder charge-operated bolt setter, as set forth in claim 6, wherein said means for effecting the stepwise movement of said cartridge magazine comprising an elongated lever attached 'at one end to said first arm of said switching lever and having its opposite end bent angularly and arranged to engage one of the recesses in the edge of said cartridge magazine for advancing said cartridge magazine through said magazine channel as said switching lever is pivoted.

8. A powder charge-operated bolt setter, as set forth in claim 1, wherein said means arranged in operative engagement with said percussion pin and said firing pin comprising a two-arm rocking lever pivotally mounted within said casing at a point spaced between the axis of said percussion pin and the axis of said barrel and extending transversely of the axes of 'saidpercussion pin and barrel, one arm of said rocking lever extending from the point of pivotal attachment thereof into engagement with the first-end of said percussion pin which is more remote from the firing end of the boltsetter and the other arm of said rocking lever extending in the opposite directionfrom said one arm thereof and arranged in contacting relationship with said firing pin for displacing said firing pin inthefiring direction when said percussion pin is released from itscocked position and'is displaced in the direction op- 'posite' to the firing direction.

9. Apowder charge-operated bolt setter, as set forth in claim 8, whereinsaidpercussion pin comprises an axially extendingfirst section arranged at its'first end in contact with the one'arm'of said'rocking lever, a collar extending outwardly from said first section at a position spaced from the end thereof in contact with said rocking lever, a second section of said second section in the direction away from said first section and having a collar thereon at a position spaced from said section, and a spring member positioned within said casing and at one end acting against said collar on said third section for biasing said percussion pin in the direction of said rocking lever.

Claims

1. A powder charge-operated bolt setter for remotely inserting anchoring elemEnts, such as in applying exothermic plates on chill molds, includes a casing, a barrel positioned within said casing, said barrel having an axially extending bore therethrough with a cartridge chamber formed at one end thereof, a hammer piston located within the bore of said barrel for free axial displacement therethrough, an axially displaceable spring loaded percussion pin located within said casing, and a firing pin arranged to be displaced by said percussion pin for firing a cartridge located within said cartridge chamber, wherein the improvement comprises said percussion pin is spaced laterally from and in parallel relationship with the bore through said barrel, said percussion pin being coextensive for a portion of its length with said barrel, said percussion pin having a first end located adjacent to and spaced laterally from said firing pin and a second end spaced more remotely from said firing pin, means for holding said percussion pin in the cocked position, means for axially displacing said percussion pin opposite to the firing direction of said barrel when it is released from its cocked position, means arranged in operative engagement with the first end of said percussion pin and said firing pin so that by releasing said percussion pin from its cocked position for displacement opposite to the firing direction of said barrel said means displaces said firing pin in the firing direction for exploding a cartridge and displacing said hammer piston axially through said barrel in the firing direction, said barrel having a recess in its outer surface, means arranged for effecting remote firing of the bolt setter comprising a support member fitted to and extending outwardly from said casing substantially normally to the axial direction of said barrel therein, an elongated release bar in parallel relationship with and supported by said support member and being displaceable relative to said support member in its elongated direction, said release bar having one end positioned within said casing and being displaceably positionable within the recess in said barrel and its other end positioned remotely from said casing so that by displacing said release bar at its other end inwardly toward said barrel, said release bar effects the release of said percussion spring from its cocked position so that the bolt setter can be fired.

2. A powder charge-operated bolt setter, as set forth in claim 1, wherein said support member is a tubular member, said release bar located within said tubular member, and a spring member located within said tubular member for resiliently biasing said release bar in the direction away from said barrel in said casing.

3. A powder charge-operated bolt setter, as set forth in claim 2, wherein the end of said release bar positioned within said casing has an axially elongated slot formed therein, the portion of said release bar containing said slot having at least one tapered surface converging toward the adjacent end of said release bar, said means for holding said percussion pin in the cocked position comprising a spring loaded pin located within said housing and extending through the slot in said release bar for engagement with said percussion pin, said tapered surface of said release bar arranged to contact a tapered surface on said spring loaded pin and to displace said pin from engagement with said percussion pin when said release bar is displaced axially in the direction of said barrel.

4. A powder charge-operated bolt setter, as set forth in claim 1, wherein said casing forming a magazine channel therethrough rearwardly of said barrel and perpendicularly intersecting the axis of said barrel, a cartridge magazine arranged to be positioned within said magazine channel, and guide means secured to said casing for guiding said cartridge magazine into said magazine channel, said cartridge magazine arranged to be held by said guide means and to be advanced through said magazine channel in a stepwise manner, said cartridge magazine having a plurality of recesses alOng an edge thereof spaced in the longitudinal direction for cooperating in the stepwise movement of said cartridge magazine.

5. A powder charge-operated bolt setter, as set forth in claim 4, wherein means located within said casing and arranged to be disposed in cooperating relationship with said cartridge magazine said percussion pin and said barrel for advancing said cartridge magazine in a stepwise manner through said magazine channel for cocking said percussion pin by displacing it axially in the firing direction of the bolt setter and for axially displacing said barrel in the firing direction in the event it is jammed within said casing.

6. A powder charge-operated bolt setter, as set forth in claim 5, wherein said means disposed in cooperating relationship with said magazine said percussion pin and said barrel comprising a switching lever pivotally mounted in said casing, means for effecting the stepwise movement of said cartridge magazine through said cartridge channel, said lever having a plurality of angularly spaced arms thereon and comprising a first arm arranged in operative engagement with said means for advancing said magazine cartridge in a stepwise manner, a second arm in operative engagement with said percussion pin for displacing said percussion pin in the firing direction, a third arm arranged to engage said barrel for displacing it in the axial direction, and a fourth arm, an actuating element attached to said fourth arm for pivoting said switching lever and for effecting the cooperating action with said magazine, said percussion pin, and said barrel.

7. A powder charge-operated bolt setter, as set forth in claim 6, wherein said means for effecting the stepwise movement of said cartridge magazine comprising an elongated lever attached at one end to said first arm of said switching lever and having its opposite end bent angularly and arranged to engage one of the recesses in the edge of said cartridge magazine for advancing said cartridge magazine through said magazine channel as said switching lever is pivoted.

8. A powder charge-operated bolt setter, as set forth in claim 1, wherein said means arranged in operative engagement with said percussion pin and said firing pin comprising a two-arm rocking lever pivotally mounted within said casing at a point spaced between the axis of said percussion pin and the axis of said barrel and extending transversely of the axes of said percussion pin and barrel, one arm of said rocking lever extending from the point of pivotal attachment thereof into engagement with the first end of said percussion pin which is more remote from the firing end of the bolt setter and the other arm of said rocking lever extending in the opposite direction from said one arm thereof and arranged in contacting relationship with said firing pin for displacing said firing pin in the firing direction when said percussion pin is released from its cocked position and is displaced in the direction opposite to the firing direction.

9. A powder charge-operated bolt setter, as set forth in claim 8, wherein said percussion pin comprises an axially extending first section arranged at its first end in contact with the one arm of said rocking lever, a collar extending outwardly from said first section at a position spaced from the end thereof in contact with said rocking lever, a second section secured to the end of the first section of said percussion pin remote from said rocking lever and having an axially extending tapered surface converging in the firing direction of the bolt setter, the end of said second section adjacent said first section forming a transverse face arranged to cooperate in securing said percussion pin in the cocked position, and a third section extending axially from the smaller diameter end of said second section in the direction away from said first section and having a collar thereon at a position spaced from said section, and a spring member positioned within said casing and at one end acting against said collar on said third section for biasing said percussion pin in the direction of said rocking lever.