Power actuated tool

Abstract

.Iadd.An improved power-actuated tool having means for preventing firing if the tool is not properly aligned with the work surface. The tool housing member includes a slidably mounted firing mechanism having cocking means extending forwardly into engagement with a sensing means mounted in the barrel member for relative axial movement therewith. A first member is attached to the barrel member. A second member is mounted within the first member for relative axial movement therewith and with respect to the barrel member, and includes a portion adapted to engage the sensing means. The second member must be moved rearwardly with respect to the first member whereby the sensing means is moved rearwardly with respect to the barrel member and engages the cocking means to move the firing mechanism into the cocked position. The tool may also include an extractor mechanism mounted on the breech end of the barrel and provided with a lip portion adapted to engage the head of a cartridge positioned in the cartridge chamber. The extractor mechanism also includes an elongated portion slidably mounted in the barrel member and extending into a barrel guide slot. The end of the elongated portion is adapted to be engaged by a barrel guide screw secured to the housing upon movement of the barrel member from the breech closed to breech open position. The movement of the barrel member relative to the housing serves to move the extractor mechanism rearwardly with respect to the cartridge chamber thereby withdrawing the cartridge from the cartridge chamber.

What is claimed is: 
     
       1. A power-actuated tool including a receiver having a front and rear portion, barrel means slidably mounted within said front portion for movement between a breech open position and a breech closed position, said barrel means including a breech end and a muzzle end, firing pin means mounted in said rear portion for movement between a cocked position and a fired position, cocking means operably connected to said firing pin means to move said firing pin means from its fired position to its cocked position, sleeve means attached to the muzzle end of said barrel means, guide means mounted within said sleeve means for relative axial movement therewith, and sensing means mounted in said barrel means for relative movement therewith, said sensing means being in engagement with said cocking means and with said guide means when said barrel means is in its breech closed position with said guide means extending from the muzzle end of said sleeve means, whereby said guide means must be moved toward said rear portion of said .[.housing.]. .Iadd.receiver .Iaddend.with respect to said sleeve means to move said firing pin means to its cocked position. 
     
     
       2. The power-actuated tool of claim 1 wherein said front and rear portions of said receiver are separated by a breech closure member, said cocking means extends into said forward portion .Iadd.of said receiver.Iaddend., said sensing means comprises an elongated rod member mounted within an axially extending groove in the outer surface of said barrel .[.member.]. .Iadd.means.Iaddend., and said barrel .[.member.]. .Iadd.means .Iaddend.includes a circumferentially extending groove on its outer surface, and further including a band spring mounted within said groove, said sensing means having a cutout portion for reception of said band spring, the length of said cutout portion being greater than the width of said spring to permit movement of said sensing means with respect to said barrel means. 
     
     
       3. The power-actuated tool of claim 1 wherein said sleeve .[.member.]. .Iadd.means .Iaddend.comprises a buffer housing member having a counterbore therein, said counterbore having a larger diameter than the bore of said barrel means and wherein said guide means has an upstanding flange adjacent its rearward end having a diameter substantially equal to the diameter of said counterbore, and further comprising a buffer member disposed between said counterbore and said flange .[.member.]., said buffer member having an axial length less than the depth of the counterbore minus the thickness of said flange whereby axial movement of said .[.fastener.]. guide .Iadd.means .Iaddend.relative to said buffer .[.housing.]. .Iadd.member .Iaddend.is permitted. 
     
     
       4. The power-actuated tool of claim 3 further including piston means mounted within said barrel means for movement from a firing position to a driven position, said guide means including a tapered portion, and said piston means including a correspondingly tapered portion adapted to engage said tapered portion on said guide means when said piston .Iadd.means .Iaddend.is in its driven position whereby the energy of said piston is transferred to said buffer member if said piston is driven beyond said driven position. 
     
     
       5. A power-actuated tool including a receiver having a front and rear portion separated by a breech closure portion, a barrel member slidably mounted within said front portion for movement between a breech open and breech closed position, said barrel member having a breech end and muzzle end, firing pin means mounted within said rear portion for movement between a fired .[.positions.]. .Iadd.position .Iaddend.and a cocked position, cocking means operably connected to said firing pin means to move said firing means from its fired position to its cocked position, said cocking means extending into said .[.forward.]. .Iadd.front .Iaddend.portion of said receiver, buffer housing means secured to the muzzle end of said barrel .[.means.]. .Iadd.member.Iaddend., said buffer housing .Iadd.means .Iaddend.having an enlarged counterbore opening into said barrel means, said counterbore having a greater diameter than the bore of said barrel .[.means.]. .Iadd.member.Iaddend., guide means mounted within said buffer housing .Iadd.means .Iaddend.for relative axial movement therewith, said guide means having an outwardly extending flange portion adjacent its rearward end, said flange portion having a diameter substantially equal to the diameter of said counterbore, buffer means mounted within said counterbore and positioned between said buffer housing .Iadd.means .Iaddend.and said flange .[.position.]. .Iadd.portion .Iaddend.of said guide means, said buffer .[.member.]. .Iadd.means .Iaddend.having an axial length less than the difference between the length of the counterbore and width of said flange portion whereby axial movement of said guide means relative to said buffer housing .Iadd.means .Iaddend.is permitted, sensing rod means mounted in a groove in the outer surface of said barrel .[.means.]. .Iadd.member .Iaddend.and extending the entire length thereof, a band spring surrounding said barrel member and mounted in a groove therein, said sensing rod means having a cutout portion for reception of said band spring, said cutout portion having a greater axial length than the width of said band spring whereby limited relative axial movement of said sensing rod means with said barrel member is permitted, said sensing means engaging said cocking means and in contact with said guide means when said barrel .[.means.]. .Iadd.member .Iaddend.is in its breech closed position with said guide means extending from the muzzle end of said buffer housing .Iadd.means .Iaddend.whereby said guide means must be moved rearwardly with respect to said buffer housing .Iadd.means .Iaddend.until their end faces are substantially flush with each other to move said sensing means and cocking means rearwardly with respect to said barrel member and said receiver to thereby move said firing pin means from its fired position to its cocked position.  .[.6. A power-actuated tool including a receiver having a tubular forward portion, a barrel member mounted within said forward portion for relative movement therewith, said barrel member having cartridge chamber in one end thereof, a barrel guide slot extending axially in said barrel member, means secured to the forward portion of said receiver and extending into said barrel guide slot, and extractor means mounted on said barrel member and having a lip portion communicating with said cartridge chamber and adapted to engage a cartridge positioned in said cartridge chamber, said extractor means being mounted for relative axial movement with respect to said barrel member and having a portion extending into said barrel guide slot whereby during movement of said barrel member with respect to said receiver member said means extending into said barrel guide slot will engage said portion of said extractor to actuate said extractor..]. .[.7. The power-actuated tool of claim 6 further including a bore in said barrel member, a piston member having a head portion and a shank portion mounted within said bore, and wherein said barrel guide slot communicates with said bore and said means secured to said receiver extends into said bore 
     
     
        in a position to engage the head portion of said piston member..]. 8. The power-actuated tool of claim .[.6.]. .Iadd.11 .Iaddend.wherein said extractor means includes a rod portion extending through an opening in said barrel member and into said barrel guide slot and said barrel member includes a cutout portion communicating with said cartridge chamber for 
     
     
        reception of said extractor .Iadd.means.Iaddend.. 9. The power-actuated tool of claim 8 further including a groove in the outer surface of said barrel member having a portion communicating with said opening, and a band spring positioned in said groove and extending about said barrel member with an end portion extending into said portion communicating with said opening, said rod portion of said extractor .Iadd.means .Iaddend.having a cutout portion for reception of said band spring, said cutout portion having a length greater than the width of said band spring whereby limited relative movement of said extractor .Iadd.means .Iaddend.with said barrel 
     
     
        member is permitted. 10. A power-actuated tool including a receiver having a tubular forward portion, a barrel member mounted within said forward portion for relative movement therewith, said barrel member having a bore in one end thereof and a cartridge chamber in the opposite end thereof communicating with said bore, a barrel guide slot extending axially in said barrel member and communicating with said bore, screw means secured to the forward portion of said receiver and extending through said barrel guide slot into said bore, piston means mounted within said bore, said piston means having a head portion and a reduced shank portion, an extractor mounted on said opposite end of said barrel member, said extractor including a head portion received within a slot in said barrel member, said head portion including a lip communicating with said cartridge chamber and adapted to engage a cartridge positioned in said cartridge chamber, a rod portion on said extractor extending through an opening in said barrel .[.means.]. .Iadd.member .Iaddend.and into said barrel guide slot, a circumferential groove in the outer surface of said barrel member having a portion communicating with said opening, and a band spring positioned in said groove and extending about said barrel member with an end portion extending into said portion of said groove communicating with said opening, said rod portion of said extractor having a cutout portion for reception of said band spring, said cutout portion having a length greater than the width of said band spring whereby limited relative movement of said extractor with said barrel member is permitted, said means on said receiver extending into said bore being positioned to engage the head portion of said piston member and said rod portion of said extractor upon movement of said barrel member relative to said receiver. 
     
     
        .Iadd.11.  A power-actuated tool including a receiver having a tubular forward portion, a barrel member mounted within said forward portion for relative movement therewith, said barrel member having a cartridge chamber in one end thereof and a bore, a piston member having a head portion and a shank portion mounted within said bore, a barrel guide slot extending axially in said barrel member and communicating with said bore, means secured to the forward portion of said receiver and extending into said barrel member through said barrel guide slot and into said bore in a position to engage the head portion of said piston member, and extractor means mounted on said barrel member and having a lip portion communicating with said cartridge chamber and adapted to engage a cartridge positioned in said cartridge chamber, said extractor means being mounted for relative axial movement with respect to said barrel member and having a portion extending into said barrel guide slot whereby, during movement of said barrel member with respect to said receiver, said means extending into said barrel guide slot will engage said portion of said extractor means to actuate said extractor means. .Iaddend. .Iadd.12. A power-actuated tool comprising: (a) a receiver;   (b) a barrel member mounted in said receiver for relative axial movement therewith;   (c) a piston member mounted in a bore within said barrel member for movement therein between a driving position and a driven position;   (d) means forming a cartridge chamber in a breech end of said barrel member;   (e) means forming an axially extending guide slot in said barrel member, said guide slot opening into said barrel bore;   (f) guide means secured to said receiver and extending through said guide slot and into said barrel bore, said guide means being operable to engage said piston member to move the latter from said driven position to said driving position responsive to axial movement between said barrel member and said receiver;   (g) said barrel member having a slot communicating with said cartridge chamber;   (h) means forming an opening extending through said barrel member between said last named slot and said barrel guide slot;   (i) extractor means moveably mounted in said barrel member slot, said extractor means including a lip portion adapted to engage the head of a cartridge chambered in said cartridge chamber, and said extractor means including a portion thereof extending through said opening into said barrel guide slot;   (j) means forming a recess extending circumferentially about said barrel member;   (k) a spring means mounted in said recess and operable to limit the extent of movement of said extractor means; and   (l) said guide means being operable to engage said portion of said extractor means extending into said barrel guide slot, when returning said piston member to said driving position, to actuate said extractor means. .Iaddend.