An explosively actuated tool for driving a fastener into a substrate is of the type in which the tool is mounted to the end of a pole-like handle to permit manipulation and actuation of the tool from a remote position wherein actuation of the tool occurs by pushing the forward end of a barrel of the
An explosively actuated tool for driving a fastener into a substrate is of the type in which the tool is mounted to the end of a pole-like handle to permit manipulation and actuation of the tool from a remote position wherein actuation of the tool occurs by pushing the forward end of a barrel of the tool against the substrate using the handle and then pushing on the handle which loads and then releases the firing mechanism of the tool. A lock device is incorporated to prevent "air firing" of the tool by pushing the handle without the forward end of the barrel being pressed against the substrate. The lock device has a lock member which cooperates with the firing pin or firing pin spring support of the firing mechanism to lock one or other of those components unless the lock member is released by a prior displacement caused by retraction of the barrel when its forward end is pressed against the substrate.
대표청구항▼
The invention claimed is: 1. An explosively actuated tool for driving a fastener into a substrate, the tool being of the type mountable to an end of a handle to permit manipulation and actuation of the tool from a remote position wherein actuation of the tool occurs by pushing a forward end of a ba
The invention claimed is: 1. An explosively actuated tool for driving a fastener into a substrate, the tool being of the type mountable to an end of a handle to permit manipulation and actuation of the tool from a remote position wherein actuation of the tool occurs by pushing a forward end of a barrel of the tool against the substrate using the handle and then pushing on the handle which loads and then releases a firing mechanism of the tool, the firing mechanism including a firing pin, a firing pin spring, and a firing pin spring support by which the firing pin spring is loaded; wherein the tool further comprises, in addition to said barrel and said firing mechanism, a lock device to prevent air firing of the tool by pushing the handle without the forward end of the barrel being pressed against the substrate, the lock device including a lock member which is engageable with one of the firing pin and the firing pin spring support to lock said one of the firing pin and the firing pin spring support against forward displacement unless the lock member is released by a prior axially rearward displacement of the barrel to a predetermined rearward position when the forward end thereof is pressed against the substrate; and wherein said lock member comprises a lever being both (i) displaceable axially of and relative to said barrel, and (ii) pivotable towards said one of the firing pin and the firing pin spring support. 2. The tool according to claim 1, wherein, when said lever has engaged with said one of the firing pin and the firing pin spring support, a subsequent rearward displacement of said barrel into the predetermined rearward position will not disengage said lever from said one of the firing pin and the firing pin spring support. 3. An explosively actuated tool for driving a fastener into a substrate, said tool comprising: a housing; a handle at a rear end of the housing; a barrel from which the fastener is to be fired, the barrel being mounted within the housing to project from a forward end of the housing and the barrel being displaceable axially rearwardly relative to the housing; a firing mechanism actuable by forward displacement of the handle; and a lock device for preventing actuation of the firing mechanism when the barrel is not in a predetermined rearward position within the housing; wherein said lock device comprises a lever being both (i) displaceable axially relative to both said barrel and said housing, and (ii) pivotable towards said firing mechanism. 4. The tool according to claim 3, wherein the firing mechanism includes a structure driven by said handle and moveable forwardly relative to the housing to a firing position, a firing pin, and a firing pin spring which is positioned between the structure and the firing pin and is loaded by forward movement of the structure relative to the housing toward the firing position, wherein the structure being in the firing position causes said firing pin to be displaced forwardly under a spring force of the loaded firing pin spring, thereby effecting firing of said firing mechanism. 5. The tool according to claim 4, wherein the lever is biased to pivot towards said firing mechanism to a locking position in which a rear end portion of the lever projects into a path of the structure toward the firing position and prevents forward movement of said structure sufficient to effect firing, the lever being released from said locking position to a released position in response to displacement of the barrel rearwardly into said predetermined rearward position. 6. The tool according to claim 5, wherein release of the lever is effected by engagement of the lever with a rear end of the barrel as the barrel moves into the predetermined rearward position. 7. The tool according to claim 6, wherein the lever is displaced to the released position by a cam action when the rear end of the barrel engages a front end portion of the lever as the barrel moves into the predetermined rearward position. 8. The tool according to claim 7, further comprising a first cam surface on the lever and a second cam surface fixed to the housing, the cam action being provided by the first cam surface co-operating with the second cam surface, the lever being displaced axially rearwardly upon engagement by the rearwardly moving barrel whereby relative movement between the two co-operating cam surfaces causes the lever to pivot into the released position. 9. The tool according to claim 5, wherein said structure is a support which mounts the firing pin and the firing pin spring, the support having a coupling for releasable connection of the handle. 10. The tool according to claim 4, wherein the lever is biased to pivot towards said firing mechanism to a locking position in which said lever locks the firing pin against forward displacement in the event of forward movement of said structure absent displacement of the barrel into said predetermined rearward position. 11. The tool according to claim 4, wherein the lever is biased to pivot towards said firing mechanism to a locking position in which a rear end portion of the lever is in alignment with, or is within, a locking recess in the firing pin; and the lever is displaced out of the alignment with the locking recess, or out of said locking recess, into a disabled position in which the locking effect of the lever is disabled in response to movement of the barrel into the predetermined rearward position. 12. The tool according to claim 4, wherein the firing pin has a locking recess in which a locking part of the lever is receivable to prevent forward displacement of said firing pin and, hence, firing of said firing mechanism; said structure is a firing pin spring support, which closes the locking recess and prevents the locking part of the lever from entering said locking recess when said firing pin spring support is in a rear position; said firing pin spring support exposes the locking recess to permit entry of the locking part of the lever during forward displacement of said firing pin spring support toward the firing position, when the barrel is not in the predetermined rearward position. 13. The tool according to claim 12, wherein the locking part of the lever is axially rearwardly displaceable, by rearward displacement of the barrel into said predetermined rearward position, beyond a position in which the locking part can enter into the locking recess in the firing pin. 14. The tool according to claim 3, comprising a first spring urging said lever to pivot about a pivot pin towards said firing mechanism; and a second spring biasing said lever axially toward the forward end of said housing, said second spring being different from said first spring. 15. The tool according to claim 14, wherein said lever comprises an axial slot in which said pivot pin and said second spring are positioned, said second spring biasing said lever toward the forward end of said housing. 16. An explosively actuated tool for driving a fastener into a substrate, the tool being of the type mountable to an end of a handle to permit manipulation and actuation of the tool from a remote position wherein actuation of the tool occurs by pushing a forward end of a barrel of the tool against the substrate using the handle and then pushing on the handle which loads and then releases a firing mechanism of the tool, the firing mechanism including a firing pin, a firing pin spring, and a firing pin spring support by which the firing pin spring is loaded; wherein the tool further comprises in addition to said barrel and said firing mechanism, a lock device to prevent air firing of the tool by pushing the handle without the forward end of the barrel being pressed against the substrate, the lock device including a lock member which cooperates with one of the firing pin and the firing pin spring support to lock said one of the firing pin and the firing pin spring support unless the lock member is released by a prior displacement caused by retraction of the barrel when the forward end thereof is pressed against the substrate; and wherein said lock member comprises a lever being both displaceable axially of said barrel and pivotable towards said one of the firing pin and the firing pin spring support; said tool further comprising a first spring urging said lever to pivot towards said one of the firing pin and the firing pin spring support; and a second spring biasing said lever axially toward the forward end of said barrel, said second spring being different from said first spring. 17. The tool according to claim 16, wherein said lever comprises an axial slot, and a pivot pin about which said lever is pivotable wherein said pivot pin and said second spring are positioned in said axial slot, said second spring biasing said lever toward the forward end of said barrel.
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이 특허에 인용된 특허 (12)
Nikolich Milovan A. (Wilmette IL), Combustion-powered tool assembly.
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