IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0037872
(2011-03-01)
|
등록번호 |
US-8579175
(2013-11-12)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Greer, Burns & Crain, Ltd.
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
▼
A pneumatic nailer includes a tool housing enclosing a cylinder with a reciprocating drive piston, and having a trigger and a workpiece contact element both connected to a trigger valve. A valve cap is mounted to the housing and includes a cycle valve and a dump valve, each valve reciprocating in a
A pneumatic nailer includes a tool housing enclosing a cylinder with a reciprocating drive piston, and having a trigger and a workpiece contact element both connected to a trigger valve. A valve cap is mounted to the housing and includes a cycle valve and a dump valve, each valve reciprocating in a respective valve chamber. The dump valve controls drive pressure for the drive piston, the cycle valve controls the return of the dump valve to allow piston return. The valve cap and the valves are constructed and arranged such that the piston is returned to a start position independent of positions of the trigger or the workpiece contact element.
대표청구항
▼
1. A pneumatic nailer, comprising: a tool housing enclosing a cylinder with a reciprocating drive piston, and having a trigger and a workpiece contact element both connected to a trigger valve;a valve cap mounted to said housing and including a cycle valve and a dump valve, each said valve reciproca
1. A pneumatic nailer, comprising: a tool housing enclosing a cylinder with a reciprocating drive piston, and having a trigger and a workpiece contact element both connected to a trigger valve;a valve cap mounted to said housing and including a cycle valve and a dump valve, each said valve reciprocating in a respective valve chamber;said dump valve controlling drive pressure for said drive piston, said cycle valve controlling the return of said dump valve to allow piston return;said dump valve controlling a main valve controlling pressure to said drive piston and said cycle valve constructed and arranged for receiving signal pressure from a return chamber to move said dump valve to close said main valve; andsaid valve cap being constructed and arranged such that said piston is returned to a start position independent of positions of said trigger or workpiece contact element. 2. The tool of claim 1, wherein a connection between said cycle valve and said dump valve and said control of said main valve by said dump valve permits piston return while said trigger valve is in an open position. 3. The tool of claim 1, further including a conduit connecting said return chamber to said cycle valve, so that pressure in said return chamber originating from said drive piston descending in said cylinder causes said cycle valve to open and pressurize said dump valve to close said main valve, allowing said return of said piston. 4. The tool of claim 1 wherein said valve cap is mounted to said housing above said cylinder. 5. The tool of claim 4 further including a spacer separating said valve cap from said housing. 6. The tool of claim 5 further including a conduit connecting said return chamber to said cycle valve passing through a space defined by said spacer. 7. A valve cap assembly for installation on a pneumatic nailer having a housing enclosing a cylinder, defining a return chamber and having an upper end opposite a workpiece contact element end, said assembly comprising: a valve cap enclosing a dump valve and a cycle valve, each said valve having a shuttle being disposed for reciprocation in a respective chamber in said cap;a conduit connecting said return chamber to said cycle valve for operating a main valve for facilitating piston return to a start position independent of a position of a trigger valve; anda gasket sealing an upper surface of said valve cap, said gasket having an opening disposed such that in a first position, said cycle valve chamber is open, enabling single drive tool operation, and in a second position, said cycle valve chamber is unplugged, enabling automatic tool operation. 8. The assembly of claim 7 further including a top cap constructed and arranged for retaining said gasket upon said valve cap. 9. The assembly of claim 7, further including a spacer configured for disposition between said upper end of said housing and said valve cap, a main valve and a main valve spring. 10. The assembly of claim 9, wherein said main valve and said main valve spring are disposed between said valve cap and said spacer. 11. The assembly of claim 7, further including a modified cylinder having a bulkhead configured for accommodating said conduit. 12. The assembly of claim 7, wherein said valve cap defines a dump valve chamber and a cycle valve chamber disposed in spaced relationship to each other, each said chamber being divided into at least three subchambers. 13. The assembly of claim 12, wherein each said chamber is dimensioned to accommodate a respective shuttle, said shuttles have formations for pneumatically sealing said subchambers from each other in a respective one of said chambers. 14. The assembly of claim 13, further including pathways in said valve cap placing designated subchambers of said dump and cycle valve chamber in fluid communication with each other. 15. The assembly of claim 7, wherein said valve cap includes a signal passageway constructed and arranged for placing said conduit and said cycle valve chamber in fluid communication with each other. 16. The assembly of claim 15 further including an adjustable needle valve in communication with said signal passageway for adjusting flow through said pathway to said valve chamber. 17. A valve cap assembly for installation on a pneumatic nailer having a housing enclosing a cylinder, defining a return chamber and having an upper end opposite a workpiece contact element end, said assembly comprising: a valve cap enclosing a dump valve and a cycle valve, each said valve having a shuttle being disposed for reciprocation in a respective chamber in said cap;a conduit connecting said return chamber to said cycle valve for operating a main valve for facilitating piston return to a start position independent of a position of a trigger valve; anda spacer configured for disposition between said upper end of said housing and said valve cap, a main valve and a main valve spring. 18. A valve cap assembly for installation on a pneumatic nailer having a housing enclosing a cylinder, defining a return chamber and having an upper end opposite a workpiece contact element end, said assembly comprising: a valve cap enclosing a dump valve and a cycle valve, each said valve having a shuttle being disposed for reciprocation in a respective chamber in said cap;a conduit connecting said return chamber to said cycle valve for operating a main valve for facilitating piston return to a start position independent of a position of a trigger valve; andsaid valve cap defines a dump valve chamber and a cycle valve chamber disposed in spaced relationship to each other, each said chamber being divided into at least three subchambers. 19. A valve cap assembly for installation on a pneumatic nailer having a housing enclosing a cylinder, defining a return chamber and having an upper end opposite a workpiece contact element end, said assembly comprising: a valve cap enclosing a dump valve and a cycle valve, each said valve having a shuttle being disposed for reciprocation in a respective chamber in said cap;a conduit connecting said return chamber to said cycle valve for operating a main valve for facilitating piston return to a start position independent of a position of a trigger valve;wherein said valve cap includes a signal passageway constructed and arranged for placing said conduit and said cycle valve chamber in fluid communication with each other; andan adjustable needle valve in communication with said signal passageway for adjusting flow through said pathway to said valve chamber. 20. A pneumatic nailer, comprising: a tool housing enclosing a cylinder with a reciprocating drive piston, and having a trigger and a workpiece contact element both connected to a trigger valve, an upper housing end located opposite said workpiece contact element;a valve cap mounted to said housing and including a cycle valve and a dump valve, each said valve reciprocating in a respective valve chamber;said dump valve controlling drive pressure for said drive piston, said cycle valve controlling the return of said dump valve to allow piston return; anda spacer configured for disposition between said upper end of said housing and said valve cap, a main valve and a main valve spring.
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