US3022513A

US3022513A - Explosive actuated stud driving tool

Info

Publication number: US3022513A
Application number: US57203A
Authority: US
Inventors: Temple Robert; Ernest E Temple
Original assignee: Mine Safety Appliances Co
Current assignee: MSA Safety Inc
Priority date: 1960-09-20
Filing date: 1960-09-20
Publication date: 1962-02-27
Anticipated expiration: 1979-02-27

Description

Feb. 27, 1962 R. TEMPLE ETAL ExPLosIvE ACTUATED STUD DRIVING Toor.

Filed Sept. 20, 1960 2 Sheets-Sheet 1 E. TEMPLE.

Feb. 27, 1962 R. TEMPLE ETAL 3,022,513

ExPLosIv'E ACTUATED STUD DRIVING TooL Filed Sept. 20, 1960 2 Sheets-Sheet 2 BYfR/VEJ'T E. TEMPLE.

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United States Parent 3,022 513 EXPLOSIVE ACTUATED STUD DRYING TOOL Robert .'Iemple, Swissvale, and Ernest E. Temple, Murraysvllle, Pa., assignors to Mine Safety Appliances Companyz a corporation of Pennsylvania Filed Sept. 20, 1960, Ser. No. 57,203 4 Claims. (Cl. 1-106) This invention relates to tools with which studs are d riven by explosive charges behind them, and more particula'rly to a tool that cannot be red accidentally.

It 1s among the objects of this invention to provide such a tool which is simple to operate, which cannot be tired without being grasped in both hands, and which automatically becomes safe when released from the hands.

In accordance with this invention a barrel is slidably mounted` in a sleeve and projects from its front end. 'The barrel has a cartridge-receiving chamber in its rear end. "ihe sleeve is provided with a longitudinal slot in its sidewallaswide and nearly as long as the barrel. The barrel is pivoted in the front end portion of the sleeve to` permit the rearV end of thebarrel to swing out of the sleeve through the slot. A spring normally holds the barrel in its swung-out position, and resilient means hold the barrel in a forward position in the sleeve. Mounted in the sleeve behind the barrel is a breechblock, from the front of which a tiring pin can project. A handle is rigidly connected to the sleeve for pushing it forward around the barrel when the barrel is held inside the sleeve and its front end is pressed against a stationary object. The sleeve can be moved forward far enough to move the tiring pin against -a cartridge in the barrel and to move the breechblock forward around the firing pinl Manually operable means are provided for driving the firing pin forward in the breechblock. Preferably, the tool also is provided with an ejector to aid in pushing the barrel forward in the sleeve as soon as the tool is withdrawn from the work, `whereby the barrel will be sure to swing out of the sleeve.

The preferred embodiment of the invention is illustrated in the accompanying drawings, in which FIG. 1 is a plan view of our tool, lwith the front endY shown in section;

FIG. 2 is a side view partly broken away in section; FIG. 3'is a central longitudinal section of the tool ready to fire;

FIGS. 4 and 5 are cross sections taken on the lines IV-IV and V-V, respectively, of FIG. 1; and F IG. 6 is a cross section taken on the line VI-VI of I 3.

Referring to the drawingsthe frame of a tool includes aheavy sleeve 1., t-he rear endof which is secured-to the frontend of a trigger housing 2` The rear end of the housing isV supported by a handle 3 of any suitable construction. .v Screwed ontok the front end of the sleeve is a collar 4 that holds a rotatable ring 5 on the sleeve. The ring encircles the collarV and' is screwed into an annular ange 6 on. the back of an eccentric shield 7 which is disposed in front of the sleeve. The shield is provided with an opening 8 coaxial with the sleeve. A barrel 9 is sldably mounted in the sleeve and extends forward through the shield and projects in front of it. The rear end of the barrel is located a short distance in front of the rear end of the sleeve. One side of the sleeve, preferably the top side, is provided with a longitudinal slot 10, which is long enough to permit the barrel to normally extend out of the sleeve at an oblique angle as shown in FIG. 2, so that the rear end of the cartridge chamber 11 (FIG. 3) in the barrel is readily accessible to the operator. A portion of the barrel in shield opening 8 is reduced in diameter so that the shield will not interfere with swinging of the rear end of the barrel out of sleeve. Y

To permit the rear end'of the bar-rel to swing in and out of the sleeve', ar pair of diametri'cally opposite pivot pins 12 are mounted in a barrel a short distance behind the shield. The pins project into longitudinal grooves 13 in theopposite sides of the front portion of the sleeve, so that the pins can both turn -and move 'lengthwise of the sleeve. The barrel is always urged forward in the sleeve by coil springs 14 (FIG. l) disposed in sockets 15 drilled lengthwise into the sleeve from the inner ends of the grooves. The springs press plungers 16 against the back of the pins. If the grooves 13 extend all thel way to the ront end of the sleeve, the distance that springs 14 can push the barrel forward is limited by forward extensions 12a of the pins, which also slide in the grooves and engage the back of the shield. When the barrel'is in itis forward position in the sleeve, the pivot pins are spaced a short distance from the rear ends of the grooves. The barrel normally is held in a swung-out position by means of a leaf spring 7 disposed in a groove 1S (FIG. 3) in the bottom ofthe-sleeve, with its front end .held by a rivet 19 t while its Vrear end presses upl against the barrel.

The barrel 9 can be swung into the'sleeve, where it will be concentric therewith, by grasping the sleeve and barrel in one hand and squeezing' them together. When the barrel is in its inner or operative position, it is directly in front of a breechblock 20 that engages the front end of the triggerhousing 2. A tiring pin 21 (FIG. 3)' is slidably mounted in the breechblock and projects from its front end when the tool is not ready for tiring, but the projecting pin normally is spaced from the barrel even whenY the barrel is entirely within sleeve l. The pin is held in its forward position by a hammer- 22.en gaging its rear end, the hammer being slidably mounted in housing 2 and urged forward by a coil spring 23.

The hammer can-be retracted and released by any suitable manually opera-ted means. For example, a trigger 25, projecting from the housing, may be provided inside the housing with a slot 26 extending lengthwise ofthe tool and receiving

crossl pins

27 and 28 anchored in the housing. The'frontend of the slot` curves upwardA and the central portion is provided with an upwardly extending notch-29. The notch and frontend of the slot are same distance apart as the twov cross pins. The trigger normally is held in aforward position because its rear end projects into a vertical slot 31 in the front end of'a plunger 32 slidablyv mounted' in a bore 33. in the tool handle. The plunger is urged forward by a coil spring 34 behind it. The trigger carries-a pivoteds'ear 36 that i normally engages thebottom of the hammerfin front of a radial shoulder 37'. The Seariisr'urged upward by a small'spring 38 attachedto the trigger. When the trigger is pulled backward toward` the hammer, the scar engages thehammer shoulder'andretracts the hammery until' the trigger -moves downwardY on

cross'pins

27 and 28 so that the'hammer shoulder can move forward over the scar. When the trigger is released, it will be pushed forward by plunger 32, and' the sear will ride forwardl'across the shoulder and snap into operative position once again.

To operate this tool, a cartridge 40, supporting the rear end of a stud 41, is inserted in cartridge chamber 11 `while the barrel is in its outer or safety position shown in FIG. 2. The barrel is then pressed down into the sleeve and held there while the muzzle is placed against the object 42 (FIG. 3), into which the stud is to be driven. The tool handle then is pushed ahead to slide the sleeve 1 forward on the barrel until the breechblock engages the cartridge, as shown in FIG. 3. By that time the rear wall of slot 10 will have moved a short distance over the rear end of the barrel, which therefore will become locked in the sleeve. During forward move- 3,022,513 Y Patentes rei. 27, rss2 the cartridge and stops before the breechblock engages Y the cartridge, whereby the hammer spring23 is compressed slightly. The toolV now is readyto berred, which is done by pulling back the trigger as previously explained in order rst to retract the hammer and then to release it. When the hammer is driven forward by its spring against the tiring pin, the latter is moved forward in the breechblocl:Y and detonates the cartridge to drive the stud out of the barrel and through the muzzle block and into work 42. The moment forward pressure on the tool handle is released by the operator, the barrel and muzzle block are supposed to move forward in the sleeve so that Athe rear end of the barrel will clear the rear end of slot 10. Thereupon, leaf spring 17 will swing the barrel up out of the sleeve to the position shown in FIG. 2.

lf springs 14 can be made strong enough, they will push the barrel forward in the sleeve, but since those springs must necessarily be quite small it is preferred to guarantee Y is limited by a pin 47 extending through the side wall of the sleeve and into a longitudinal groove 43l in the outside of the ejector. The front position of the ejector, as shown in FIG. 2, is such as to, substantially engage the rear end of the barrel when it is swung down into the sleeve, but not such as to prevent therbarrel from being swung down. The front wall of the ejector has a central opening 49 through it in line with the firing pin and the cartridge chamber. The breechblock has a reduced front end portion small enoughv to extend through the ejector opening and engage the cartridge when the sleeve is slidably mounted inthe sleeve and projecting from its front end, the barrel having a cartridge-receiving chamber in its rear end, the sleeve having a longitudinal slot in its side wall as wide as the barrel, means pivoting the barrel in the front end portion of the sleeve in a position to permit the rear end of the barrel to swing out of the sleeve through said slot, a spring normally holding the barrel in its swung-out position, resilient means normally holding the barrel in a forward position in the sleeve, a breechblock mounted in the sleeve behind the barrel, a ring pin projectable from the front of the breecholock, a handle rigidly connected to the sleeve for pushing it forward around the barrel when the barrel is pushed forward around the ejector and barrel in prepar- Y ing the tool for firing.

The spent cartridge can be removed from the barrel while the rear end of the barrel is projecting from the sleeve. This operation is facilitated by the use of a cartridge ejector, which includes a sleeve 51 encircling the rear end portion of the barrel in an annular recess and having an inwardly extending rear end flange V52 that of the way.

Y it can be grasped by the ngers and removedv the rest It will be seen that this tool cannot be liired until the barrel has been swungcompletelyj into the sleeve, an operation that requires the use of one hand while the Yother hand is holding the tool handle. The moment the tool is laid down or accidentally dropped, the barrel swings out of the sleeve and therefore away from the tiring pin so that the cartridge cannot be detonated. Therefore, the tool is rendered safe automatically.

We claim: 1. A stud driving tool comprising a sleeve, a barrel inside the sleeve and its front end is pressed vagainst a stationary object, the sleeve being movable forward far enough to move the firing pin against a cartridge in said chamber and to move the breechblock forward around the firing pin, and manually operable means for driving the firing pin forward in the breechblock.

2. A tool according to claim l, in which said spring is a leaf spring disposed between the barrel and the inner wall of the sleeve at the side opposite to said slot.

3. A stud driving tool comprising a sleeve, a barrel slidably mounted in the sleeve and projecting from its front end, the barrel having a cartridge-receing chamber in its rear end, the sleeve having a longitudinal slot in its side wall as wide as the barrel, means pivoting the barrel in the front end portion of the sleevein a position to permit the rear end of the barrel to swing out of the sleeve through said slot, a spring normally holding the barrel in its swung-out position, resilient means normally holding the barrel in a forward position in the sleeve, a barrel ejector slidably mounted inthe. rear end of Athe sleeve and provided with an opening coaxial with the muzzle block, a spring behind the ejector normally holding it in a position where its front `surface will engage the rear end of the barrel when the latter is inside the sleeve, a breechblock mounted in the rear end of the sleeve behind the front of the ejector, ,a firing pin projectable from the front of the breechblock, a handle rigidly connected to the sleeve for pushing it forward around the barrel when the barrel is held inside the sleeve and its Y front end is pressed against a stationary object, the sleeve being movable forward far enough to press the firing pin Aagainst a cartridge in said chamber and to move the breechblocltv forward around the firing pin and through said ejector opening, and manually operable meansy for driving the firing pin forward in the breechblock.

4. A tool according to claim 3, in which said ejector is cup-shape and encircles the breechblock.

References Cited inthe le of this patent UNITED STATES PATENTS Temple Dec. 12, 1950