CA1162352A - Powder-actuated tool with power adjustment and angle- fire control - Google Patents
Powder-actuated tool with power adjustment and angle- fire controlInfo
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- CA1162352A CA1162352A CA000421498A CA421498A CA1162352A CA 1162352 A CA1162352 A CA 1162352A CA 000421498 A CA000421498 A CA 000421498A CA 421498 A CA421498 A CA 421498A CA 1162352 A CA1162352 A CA 1162352A
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- barrel
- tool
- piston
- slide assembly
- power
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Abstract
TITLE: POWDER-ACTUATED TOOL WITH POWER ADJUSTMENT
AND ANGLE-FIRE CONTROL
INVENTOR: Jean Ollivier DOCKET NO.: R-1191 ABSTRACT OF THE DISCLOSURE
An improved indirect-acting powder-actuated fastening tool is provided wherein the power level may be continuously varied and wherein the tool may be discharged only if the muzzle is pressed against the work surface, with the tool substantially perpendicular thereto. A barrel and a barrel breech are adjustably screwed together and telescopically carried by a slide assembly which, in turn, is telescopically carried by the tool receiver. The slide assembly and the barrel are operably connected for corotation, whereby rotation of the slide assembly produces a joint axial displacement, of the barrel and the slide assembly, relative to the barrel breech, to vary the initial volume. The axial relation between the slide assembly and the barrel is thus preserved during power level adjustment and this constant relationship is utilized to effect angle-fire control by means of a firing mechanism operable solely when the slidably mounted barrel and barrel breech are urged to the battery position against the bias of a spring.
AND ANGLE-FIRE CONTROL
INVENTOR: Jean Ollivier DOCKET NO.: R-1191 ABSTRACT OF THE DISCLOSURE
An improved indirect-acting powder-actuated fastening tool is provided wherein the power level may be continuously varied and wherein the tool may be discharged only if the muzzle is pressed against the work surface, with the tool substantially perpendicular thereto. A barrel and a barrel breech are adjustably screwed together and telescopically carried by a slide assembly which, in turn, is telescopically carried by the tool receiver. The slide assembly and the barrel are operably connected for corotation, whereby rotation of the slide assembly produces a joint axial displacement, of the barrel and the slide assembly, relative to the barrel breech, to vary the initial volume. The axial relation between the slide assembly and the barrel is thus preserved during power level adjustment and this constant relationship is utilized to effect angle-fire control by means of a firing mechanism operable solely when the slidably mounted barrel and barrel breech are urged to the battery position against the bias of a spring.
Description
1 1 623~2 This application is a division of application Ser, No. 376,321, filed April 27, 1981.
The present invention relates to powder-actuated tools and, more particularly, to means for adjusting the power level of indirect-acting power actuated fastener driving tools.
Powder-actuated fastener driving tools, of the indirect-acting type, comprise, in general, a piston, the rear end of which slides into an expansion chamber for the gases produced by the combustion of the propelling charge.
It is known in the art to continuously adjust the power level of such tools by modifying the initial volume of the expansion chamber through relative axial displace-ment of two chamber-defining tool parts. Such a displace-ment may for example, be realized by screwing one part, including the cartridge chamber, onto another part which includes stop means defining the piston battery position.
It is also known in the art to provide a safety interlock, for such tools, preventing tool discharge unless the tool muzzle is firmly pressed against the work piece, Such an interlock may, for example, be realized by a barrel slideably carried in the tool receiver and biased toward a forward or loading position, and a firing mechanism operable only when the barrel is in a rearward or battery position. Further, the receiver, which is telescoped over the barrel, may be adapted to limit access thereto, such that rearward displacement of the barrel may be accomplished only when the tool is substantially perpendicular to the wor~ surface. This feature is commonly known as angle-fire control and is intended to prevent discharge of the tool under conditions wherein ricochet of the fastener may occur.
1 1 623~2 Unfortunately, the above-described power adjust-ment technique aliers the axial relation of the barrel and the receiver. It is, therefore, presently impossible to incorporate in such a tool, both the power adjustment and constant angle-fire control features.
It is a primary object of the present invention to provide an improved indirect-acting powder actuated tool, incorporating an angle-fire control, wherein the power level is continuously variable.
In accordance with a particular embodiment of the invention there is provided an improved powder-actuated fastening tool. The tool includes a piston and driving mean~ employing a constant-power powder load to displace the piston a constant predetermined distance so as to drive a fastener into a work surface. Power adjustment means are provided for adjusting the power level of the driving means while maintaining a fixed gas flow path through the tool. Firing means are provided for activating the driving means, the firing means being operable solely when the tool is pressed against the work surface with the longitudinal axis of the piston substantially perpen-dicular thereto, and further being operably independent of the power level setting of the power adjustment means, In accordance with a further embodiment of the invention there is provided a power actuated tool. The tool includes a means fcrming a barrel having a bore and means forming a firing chamber communicating with a breech end of the barrel bore, A fastener-driving piston is reciprocally slidably disposed in the barrel bore for movement between a breechward battery position and a muzzle-ward driven position. ~top means are provided in the 1 ~ 62352 barrel bore for contacting a breechward surface on the piston to define the battery position of the piston. Means forming a muzzle end of the tool are provided for positioning against a work surface preparatory to driving of a fastener by the tool and means are provided for cocking the tool for firing when the muzzle end of the tool is pressed against a work surface. Angle-fire control means are operably associated with the muzzle end of the tool in a predetermined relation-ship for enabling cocking of the tool only when the axis of the barrel is substantially perpendicular to a work surface.
power control means are provided for axially displacing the stop means whereby a breechwardmost surface of the piston can be variably spaced from the firing chamber when the piston is in the battery position whilç maintaining the predetermined relationship between the angle-fire control means and the muzzle end of the tool to provide substan-tially constant angle-fire control at all power levels of the tool.
Thus, in general, the tool includes a barrel and a barrel breech which are adjustably screwed together and telescopically carried by a slide assembly which, in turn, is telescopically carried by the tool receiver. More specifically, the slide assembly and the barrel are oper-ably connected for corotation, whereby rotation of the slide assembly produces a joint axial displacement of the barrel and the slide assembly, relative to the barrel breech, nevertheless, are axially displaceable, relative to the sleeve assembly, between a loading position and a battery position. Thus, the axial relation between the slide assembly and the barrel is preserved during power level adjustment and this constant relationship is utilized to _ 2a -1 ~ 62352 effect angle-fire control by means of a firing mechanism which is operable solely when the barrel and the barrel breech are in the battery position. Further, the ability of the tool to accept fasteners of differing lengths is unaffected by power adjustment. Means are provided biasing the barrel and the barrel breech toward the loading position, it being possible to overcome the biasing means by pressing the barrel muzzle against the work surface, while the tool is substantially perpendicular thereto.
- 2b -. R-ll91 Brief Description Of The Drawing The above and other objects, as may hereinafter appear, may be more clearly understood by reference to the following detailed description of the preferred embodiment, the appended claims and the drawing wherein:
Figure 1 is a side cross-sectional view of an indirect-acting powder-actuated fastener driving tool, arranged and constructed in accord with the present invention, wherein`the barrel and barrel breech are in the loading position and adjusted for maximum power output;
Figure 2 is a fragmentary top cross-sectional view of the tool of Figure l;
Figure 3 is a side cross-sectional view, similar to Figure 1, showing the tool in condition ready to be fired; and Figure 4 is a side cross-sectional view similar to Figure l,wherein the tool is adjusted for minimum power output.
Description Of The Preferred Embodiment In the drawing, there is shown an indirect-acting powder-actuated fastening tool including a barrel 1 having a longitu-dinal bore la, a breech end lb and a muzzle end lc. A piston 3, having a head 3a, is slidably disposed within the barrel bore la. A barrel breech 5 is threadedly carried on the breech end lb of the barrel 1 and includes a cartridge-receiving chamber 5a communicating with a gas expansion chamber 5b adapted to receive a portion 3b of the piston head 3a in gas-tight sliding rela~ion. An inwardly projecting lip ld is provided, proximate the breech end lb of the barrel 1, cooperating with a second portion 3c of the piston head 3a to limit its motion toward the cartridge-receiving chamber 5a.
A slide assembly 7 is telescoped over the barrel 1 and the barrel breech 5, both of which are jointly axially ~isplaceable, relative to the slide assembly 7, between a :forward or cartridge loading position, as seen in Figure 1 and a rearward or battery position, as seen in Figure 3.
A barrel sleeve 9 is disposed intermediate the muzzle end lc of the barrel 1 and the slide assembly 7, both of which are operatively connected, for reasons which will be more fully explained hereinafter, by means of a key 11, slidably carried in a longitudinal slot 9a in the barrel sleeve 9. Key 11 includes portions lla and llb extending into longitudinal slots le and 7a in the barrel 1 and the slide assembly 7, respectively.
~~ A spring retaining ring 12 secures the key 11 against accidental dislodgement, The barrel sleeve 9 is operably connectable to the barrel 1, during rearward repositioning of the piston 3, by means of a ball 13, carried in a bore 9b in the barrel sleeve 9, extendable into a recess lf in the barrel 1.
A receiver sleeve 15 is disposed intermediate the breech end lb of the barrel 1 and the slide assembly 7 and is threadedly carried on the barrel sleeve 9.
A slide assembly 7 is telescoped into the tool receiver 17, to which the receiver sleeve 15 is threadedly connected. A
retaining screw 19 secures the receiver sleeve 15 against being unscrewed from the receiver 17 during operation of the tool and, more importantly, it engages a slot 5c in the barrel breech 5, whereby the same is prevented from rotating relative to the receiver 17.
The receiver 17 also supports a firing mechanism including a cocking slide 21, disposed rearwardly of the barrel breech 5, axially displaceable between a forward position, and a rear-ward, or cocked position, pursuant to displacement of the 1 ~ 62352 barrel 1 and the barrel breech 5 from the cartridge loading position to a battery position. A helical barrel spring 23 biases the cocking slide 21 toward the forward position and further serves to bias the barrel 1 and the barrel breech 5 toward the cartridge loading position.
A rebounding firing pin 25, mounted on a firing pin slide 27, is biased toward contact with a cartridge C by a hel-ical firing pin spring 29. A spring-loaded firing pin pawl 31, carried by the firing pin slide 27, engages the cocking slide 21.
A trigger bar 33, operatively connected to a trigger 34 is disposed to rotatably displace a spring-loaded sear 35 to disengage the firing pin pawl 31 from the cocking slide 21 when the latter is in the cocked position.
Forwardly of the barrel 1, and concentric therewith, the barrel sleeve 9 supports a buffer housing 37 carrying an elastomeric buffer 39 adapted for cooperation with the portion 3c of the piston head 3a consequent to discharge of the tool.
A tiltable muzzle bushing B of the type described in United ~tates patent 4,210,267, Combette et al, issued July 1, 1980, is preferably carried by the slide assembly 7, forwardly of the buffer housing 37, and includes a member b which con-stitutes, in effect an axially displaceable extension of the barrel 1 and a muzzle bushing cam c which is fastened to the barrel sleeve 9.
As shown in Figure 1, the tool is adjusted for maximum power output, with the barrel 1 screwed against the barrel breech 5. The initial volume of the gas expansion chamber 5b is, thus, at a minimum, while the length of the power-stroke, i.e. the distance that the piston must travel ~efore the ex-pansion gases may escape around the piston head, is a maximum.
- R-ll91 235~
It is to be noted that the bore diameter of the passage past l-he barrel lip ld is significantly grea~er than the diameter of the gas expansion chamber 5b, whereby the power stroke terminates at the chamber mouth. The barrel 1 and the barrel breech 5 are shown in the cartridge-loading position, while the cocking slide 21 and the firing pin slide 27 are in the forward position.
In Figure 3, the tool has been cocked, preparatory to discharge, by pressing the muzzle end bushing member b against the work surface S. The barrel 1 and the barrel breech 5 have thus been axially displaced, against the influence of the f cocking slide spring 23, to the battery position, whereat the cartridge receiving chamber 5a has telescoped over a cartridge C, while the cocking slide 21 and the firing pin slide 27 have been displaced to the cocked position. In this regard, it will be readily appreciated that the diameter of the slide assembly 7 is such as to preclude full displacement of the aforementioned parts unless the tool is substantially perpen-dicular to the work surface S.
In Figure 4, the tool is shown adjusted for minimum power output, with the barrel 1 unscrewed from the barrel breech 5, whereby the initial volume of the gas expansion chamber 5b is at a maximum and the length of the power stroke is at a minimum.
Power adjustment is effected by rotation of the slide assembly 7, which, acting through the key 11, causes the corotation of the barrel sleeve 9 and the barrel 1, relative to the barrel breech 5 and the receiver sleeve 15. This relative rotation results in the desired axial separation of the barrel 1 and the barrel breech 5, while, at the same time, R-llql 1 ~ ~2352 effecting a corresponding axial separation of the barrel sleeve 9 and the receiver sleeve 15. It is, at this point, to be understood that the screw connections between the barrel 1 and the barrel breech 5 and between the barrel sleeve 9 and the receiver sleeve 15 have the same thread pitch.
As the barrel 1 and the barrel sleeve 9 are displaced away from the barrel breech 5 and the receiver sleeve 15, they correspondingly displace the muzzle bushing B and the slide assembly 7. Thus, the axial relation between the slide assembly 7 and the barrel 1 and bushing member b is undisturbed by power level adjustment of the tool, whereby the angle-fire control ~- is maintained.
' It is, thus, to be noted that power adjustment does not change the length of piston travel during firing and does not affect the capacity of the tool to accept fasteners of different lengths.
To disassemble the tool, as for cleaning, the retaining screw 19 is removed, freeing the barrel breech 5 for corotation with the barrel 1. The entire barrel/slide assembly, less the receiver sleeve lS which remains attached to the receiver 17, is now unscrewed from the receiver 17 by rotation of the slide assembly 7. The slide assembly 7 is moved to its extreme forward position, allowing removal of the retaining ring 12 from the barrel sleeve 9. The key 11 is now removed and the barrel 1 and barrel breech 5 are withdrawn from the barrel sleeve 9, as may the buffer housing 37 and the buffer 39. The piston 3 is now slide from the barrel 1 and the barrel 1 and barrel breech 5 are unscrewed. Lastly, the muzzle bushing cam c is removed from the barrel sleeve 9, allowing removal of the barrel sleeve 9 from the slide assembly 7.
I i~23S2 Reassembly is essentially accomplished in reverse order of disassembly, it being necessary, however, to insure that the retaining ring 12 does not overlie the ball 13 and that the tool parts are properly set prior to lockup. This may be readily accomplished by screwing the barrel 1 completely into the barrel breech 5. The barrel/slide assembly is inserted into the receiver sleeve 15 and screwed to its furthest breechward position and then backed off suficiently to permit insertion of the retaining screw 19 in the slot 5c in the barrel breech 5.
While reference has been made above to a particular embodiment of the inven~ion, various alterations and modifica-tions ~Jill readily suggest themselves to those skilled in the art. Accordingly; the scope of this invention is intended to be limited solely by the following claims.
The present invention relates to powder-actuated tools and, more particularly, to means for adjusting the power level of indirect-acting power actuated fastener driving tools.
Powder-actuated fastener driving tools, of the indirect-acting type, comprise, in general, a piston, the rear end of which slides into an expansion chamber for the gases produced by the combustion of the propelling charge.
It is known in the art to continuously adjust the power level of such tools by modifying the initial volume of the expansion chamber through relative axial displace-ment of two chamber-defining tool parts. Such a displace-ment may for example, be realized by screwing one part, including the cartridge chamber, onto another part which includes stop means defining the piston battery position.
It is also known in the art to provide a safety interlock, for such tools, preventing tool discharge unless the tool muzzle is firmly pressed against the work piece, Such an interlock may, for example, be realized by a barrel slideably carried in the tool receiver and biased toward a forward or loading position, and a firing mechanism operable only when the barrel is in a rearward or battery position. Further, the receiver, which is telescoped over the barrel, may be adapted to limit access thereto, such that rearward displacement of the barrel may be accomplished only when the tool is substantially perpendicular to the wor~ surface. This feature is commonly known as angle-fire control and is intended to prevent discharge of the tool under conditions wherein ricochet of the fastener may occur.
1 1 623~2 Unfortunately, the above-described power adjust-ment technique aliers the axial relation of the barrel and the receiver. It is, therefore, presently impossible to incorporate in such a tool, both the power adjustment and constant angle-fire control features.
It is a primary object of the present invention to provide an improved indirect-acting powder actuated tool, incorporating an angle-fire control, wherein the power level is continuously variable.
In accordance with a particular embodiment of the invention there is provided an improved powder-actuated fastening tool. The tool includes a piston and driving mean~ employing a constant-power powder load to displace the piston a constant predetermined distance so as to drive a fastener into a work surface. Power adjustment means are provided for adjusting the power level of the driving means while maintaining a fixed gas flow path through the tool. Firing means are provided for activating the driving means, the firing means being operable solely when the tool is pressed against the work surface with the longitudinal axis of the piston substantially perpen-dicular thereto, and further being operably independent of the power level setting of the power adjustment means, In accordance with a further embodiment of the invention there is provided a power actuated tool. The tool includes a means fcrming a barrel having a bore and means forming a firing chamber communicating with a breech end of the barrel bore, A fastener-driving piston is reciprocally slidably disposed in the barrel bore for movement between a breechward battery position and a muzzle-ward driven position. ~top means are provided in the 1 ~ 62352 barrel bore for contacting a breechward surface on the piston to define the battery position of the piston. Means forming a muzzle end of the tool are provided for positioning against a work surface preparatory to driving of a fastener by the tool and means are provided for cocking the tool for firing when the muzzle end of the tool is pressed against a work surface. Angle-fire control means are operably associated with the muzzle end of the tool in a predetermined relation-ship for enabling cocking of the tool only when the axis of the barrel is substantially perpendicular to a work surface.
power control means are provided for axially displacing the stop means whereby a breechwardmost surface of the piston can be variably spaced from the firing chamber when the piston is in the battery position whilç maintaining the predetermined relationship between the angle-fire control means and the muzzle end of the tool to provide substan-tially constant angle-fire control at all power levels of the tool.
Thus, in general, the tool includes a barrel and a barrel breech which are adjustably screwed together and telescopically carried by a slide assembly which, in turn, is telescopically carried by the tool receiver. More specifically, the slide assembly and the barrel are oper-ably connected for corotation, whereby rotation of the slide assembly produces a joint axial displacement of the barrel and the slide assembly, relative to the barrel breech, nevertheless, are axially displaceable, relative to the sleeve assembly, between a loading position and a battery position. Thus, the axial relation between the slide assembly and the barrel is preserved during power level adjustment and this constant relationship is utilized to _ 2a -1 ~ 62352 effect angle-fire control by means of a firing mechanism which is operable solely when the barrel and the barrel breech are in the battery position. Further, the ability of the tool to accept fasteners of differing lengths is unaffected by power adjustment. Means are provided biasing the barrel and the barrel breech toward the loading position, it being possible to overcome the biasing means by pressing the barrel muzzle against the work surface, while the tool is substantially perpendicular thereto.
- 2b -. R-ll91 Brief Description Of The Drawing The above and other objects, as may hereinafter appear, may be more clearly understood by reference to the following detailed description of the preferred embodiment, the appended claims and the drawing wherein:
Figure 1 is a side cross-sectional view of an indirect-acting powder-actuated fastener driving tool, arranged and constructed in accord with the present invention, wherein`the barrel and barrel breech are in the loading position and adjusted for maximum power output;
Figure 2 is a fragmentary top cross-sectional view of the tool of Figure l;
Figure 3 is a side cross-sectional view, similar to Figure 1, showing the tool in condition ready to be fired; and Figure 4 is a side cross-sectional view similar to Figure l,wherein the tool is adjusted for minimum power output.
Description Of The Preferred Embodiment In the drawing, there is shown an indirect-acting powder-actuated fastening tool including a barrel 1 having a longitu-dinal bore la, a breech end lb and a muzzle end lc. A piston 3, having a head 3a, is slidably disposed within the barrel bore la. A barrel breech 5 is threadedly carried on the breech end lb of the barrel 1 and includes a cartridge-receiving chamber 5a communicating with a gas expansion chamber 5b adapted to receive a portion 3b of the piston head 3a in gas-tight sliding rela~ion. An inwardly projecting lip ld is provided, proximate the breech end lb of the barrel 1, cooperating with a second portion 3c of the piston head 3a to limit its motion toward the cartridge-receiving chamber 5a.
A slide assembly 7 is telescoped over the barrel 1 and the barrel breech 5, both of which are jointly axially ~isplaceable, relative to the slide assembly 7, between a :forward or cartridge loading position, as seen in Figure 1 and a rearward or battery position, as seen in Figure 3.
A barrel sleeve 9 is disposed intermediate the muzzle end lc of the barrel 1 and the slide assembly 7, both of which are operatively connected, for reasons which will be more fully explained hereinafter, by means of a key 11, slidably carried in a longitudinal slot 9a in the barrel sleeve 9. Key 11 includes portions lla and llb extending into longitudinal slots le and 7a in the barrel 1 and the slide assembly 7, respectively.
~~ A spring retaining ring 12 secures the key 11 against accidental dislodgement, The barrel sleeve 9 is operably connectable to the barrel 1, during rearward repositioning of the piston 3, by means of a ball 13, carried in a bore 9b in the barrel sleeve 9, extendable into a recess lf in the barrel 1.
A receiver sleeve 15 is disposed intermediate the breech end lb of the barrel 1 and the slide assembly 7 and is threadedly carried on the barrel sleeve 9.
A slide assembly 7 is telescoped into the tool receiver 17, to which the receiver sleeve 15 is threadedly connected. A
retaining screw 19 secures the receiver sleeve 15 against being unscrewed from the receiver 17 during operation of the tool and, more importantly, it engages a slot 5c in the barrel breech 5, whereby the same is prevented from rotating relative to the receiver 17.
The receiver 17 also supports a firing mechanism including a cocking slide 21, disposed rearwardly of the barrel breech 5, axially displaceable between a forward position, and a rear-ward, or cocked position, pursuant to displacement of the 1 ~ 62352 barrel 1 and the barrel breech 5 from the cartridge loading position to a battery position. A helical barrel spring 23 biases the cocking slide 21 toward the forward position and further serves to bias the barrel 1 and the barrel breech 5 toward the cartridge loading position.
A rebounding firing pin 25, mounted on a firing pin slide 27, is biased toward contact with a cartridge C by a hel-ical firing pin spring 29. A spring-loaded firing pin pawl 31, carried by the firing pin slide 27, engages the cocking slide 21.
A trigger bar 33, operatively connected to a trigger 34 is disposed to rotatably displace a spring-loaded sear 35 to disengage the firing pin pawl 31 from the cocking slide 21 when the latter is in the cocked position.
Forwardly of the barrel 1, and concentric therewith, the barrel sleeve 9 supports a buffer housing 37 carrying an elastomeric buffer 39 adapted for cooperation with the portion 3c of the piston head 3a consequent to discharge of the tool.
A tiltable muzzle bushing B of the type described in United ~tates patent 4,210,267, Combette et al, issued July 1, 1980, is preferably carried by the slide assembly 7, forwardly of the buffer housing 37, and includes a member b which con-stitutes, in effect an axially displaceable extension of the barrel 1 and a muzzle bushing cam c which is fastened to the barrel sleeve 9.
As shown in Figure 1, the tool is adjusted for maximum power output, with the barrel 1 screwed against the barrel breech 5. The initial volume of the gas expansion chamber 5b is, thus, at a minimum, while the length of the power-stroke, i.e. the distance that the piston must travel ~efore the ex-pansion gases may escape around the piston head, is a maximum.
- R-ll91 235~
It is to be noted that the bore diameter of the passage past l-he barrel lip ld is significantly grea~er than the diameter of the gas expansion chamber 5b, whereby the power stroke terminates at the chamber mouth. The barrel 1 and the barrel breech 5 are shown in the cartridge-loading position, while the cocking slide 21 and the firing pin slide 27 are in the forward position.
In Figure 3, the tool has been cocked, preparatory to discharge, by pressing the muzzle end bushing member b against the work surface S. The barrel 1 and the barrel breech 5 have thus been axially displaced, against the influence of the f cocking slide spring 23, to the battery position, whereat the cartridge receiving chamber 5a has telescoped over a cartridge C, while the cocking slide 21 and the firing pin slide 27 have been displaced to the cocked position. In this regard, it will be readily appreciated that the diameter of the slide assembly 7 is such as to preclude full displacement of the aforementioned parts unless the tool is substantially perpen-dicular to the work surface S.
In Figure 4, the tool is shown adjusted for minimum power output, with the barrel 1 unscrewed from the barrel breech 5, whereby the initial volume of the gas expansion chamber 5b is at a maximum and the length of the power stroke is at a minimum.
Power adjustment is effected by rotation of the slide assembly 7, which, acting through the key 11, causes the corotation of the barrel sleeve 9 and the barrel 1, relative to the barrel breech 5 and the receiver sleeve 15. This relative rotation results in the desired axial separation of the barrel 1 and the barrel breech 5, while, at the same time, R-llql 1 ~ ~2352 effecting a corresponding axial separation of the barrel sleeve 9 and the receiver sleeve 15. It is, at this point, to be understood that the screw connections between the barrel 1 and the barrel breech 5 and between the barrel sleeve 9 and the receiver sleeve 15 have the same thread pitch.
As the barrel 1 and the barrel sleeve 9 are displaced away from the barrel breech 5 and the receiver sleeve 15, they correspondingly displace the muzzle bushing B and the slide assembly 7. Thus, the axial relation between the slide assembly 7 and the barrel 1 and bushing member b is undisturbed by power level adjustment of the tool, whereby the angle-fire control ~- is maintained.
' It is, thus, to be noted that power adjustment does not change the length of piston travel during firing and does not affect the capacity of the tool to accept fasteners of different lengths.
To disassemble the tool, as for cleaning, the retaining screw 19 is removed, freeing the barrel breech 5 for corotation with the barrel 1. The entire barrel/slide assembly, less the receiver sleeve lS which remains attached to the receiver 17, is now unscrewed from the receiver 17 by rotation of the slide assembly 7. The slide assembly 7 is moved to its extreme forward position, allowing removal of the retaining ring 12 from the barrel sleeve 9. The key 11 is now removed and the barrel 1 and barrel breech 5 are withdrawn from the barrel sleeve 9, as may the buffer housing 37 and the buffer 39. The piston 3 is now slide from the barrel 1 and the barrel 1 and barrel breech 5 are unscrewed. Lastly, the muzzle bushing cam c is removed from the barrel sleeve 9, allowing removal of the barrel sleeve 9 from the slide assembly 7.
I i~23S2 Reassembly is essentially accomplished in reverse order of disassembly, it being necessary, however, to insure that the retaining ring 12 does not overlie the ball 13 and that the tool parts are properly set prior to lockup. This may be readily accomplished by screwing the barrel 1 completely into the barrel breech 5. The barrel/slide assembly is inserted into the receiver sleeve 15 and screwed to its furthest breechward position and then backed off suficiently to permit insertion of the retaining screw 19 in the slot 5c in the barrel breech 5.
While reference has been made above to a particular embodiment of the inven~ion, various alterations and modifica-tions ~Jill readily suggest themselves to those skilled in the art. Accordingly; the scope of this invention is intended to be limited solely by the following claims.
Claims (2)
1. A power actuated tool comprising:
a) means forming a barrel having a bore;
b) means forming a firing chamber communicating with a breech end of said barrel bore, c) a fastener-driving piston reciprocally slidably disposed in said barrel bore for movement between a breechward battery position and a muzzleward driven position;
d) stop means in said barrel bore for contacting a breechward surface on said piston to define said battery position of said piston, e) means forming a muzzle end of said tool for positioning against a work surface preparatory to driving of a fastener by said tool:
f) means for cocking said tool for firing when said muzzle end of said tool is pressed against a work surface, g) angle-fire control means operably associated with said muzzle end of said tool in a pre-determined relationship for enabling cocking of said tool only when the axis of said barrel is substantially perpendicular to a work surface;
and h) power control means for axially displacing said stop means whereby a breechwardmost surface of said piston can be variably spaced from said firing chamber when said piston is in said battery position while maintaining said pre-determined relationship between said angle-fire control means and said muzzle end of said tool to provide substantially constant angle-fire control at all power levels of the tool.
a) means forming a barrel having a bore;
b) means forming a firing chamber communicating with a breech end of said barrel bore, c) a fastener-driving piston reciprocally slidably disposed in said barrel bore for movement between a breechward battery position and a muzzleward driven position;
d) stop means in said barrel bore for contacting a breechward surface on said piston to define said battery position of said piston, e) means forming a muzzle end of said tool for positioning against a work surface preparatory to driving of a fastener by said tool:
f) means for cocking said tool for firing when said muzzle end of said tool is pressed against a work surface, g) angle-fire control means operably associated with said muzzle end of said tool in a pre-determined relationship for enabling cocking of said tool only when the axis of said barrel is substantially perpendicular to a work surface;
and h) power control means for axially displacing said stop means whereby a breechwardmost surface of said piston can be variably spaced from said firing chamber when said piston is in said battery position while maintaining said pre-determined relationship between said angle-fire control means and said muzzle end of said tool to provide substantially constant angle-fire control at all power levels of the tool.
2. An improved powder-actuated fastening tool comprising:
a) a piston:
b) driving means employing a constant-power powder load to displace said piston a constant pre-determined distance so as to drive a fastener into a work surface;
c) power adjustment means for adjusting the power level of said driving means while maintaining a fixed gas flow path through the tool; and d) firing means for activating said driving means, said firing means being operable solely when the tool is pressed against the work surface with the longitudinal axis of said piston substantially perpendicular thereto and further being oper-ably independent of the power level setting of said power adjustment means.
a) a piston:
b) driving means employing a constant-power powder load to displace said piston a constant pre-determined distance so as to drive a fastener into a work surface;
c) power adjustment means for adjusting the power level of said driving means while maintaining a fixed gas flow path through the tool; and d) firing means for activating said driving means, said firing means being operable solely when the tool is pressed against the work surface with the longitudinal axis of said piston substantially perpendicular thereto and further being oper-ably independent of the power level setting of said power adjustment means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000421498A CA1162352A (en) | 1980-06-12 | 1983-02-11 | Powder-actuated tool with power adjustment and angle- fire control |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US158,953 | 1980-06-12 | ||
| US06/158,953 US4358041A (en) | 1980-06-12 | 1980-06-12 | Powder-actuated tool with power adjustment and angle-fire control |
| CA000376321A CA1151802A (en) | 1980-06-12 | 1981-04-27 | Powder-actuated tool with power adjustment and angle- fire control |
| CA000421498A CA1162352A (en) | 1980-06-12 | 1983-02-11 | Powder-actuated tool with power adjustment and angle- fire control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162352A true CA1162352A (en) | 1984-02-21 |
Family
ID=27167043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421498A Expired CA1162352A (en) | 1980-06-12 | 1983-02-11 | Powder-actuated tool with power adjustment and angle- fire control |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1162352A (en) |
-
1983
- 1983-02-11 CA CA000421498A patent/CA1162352A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |