Elongated-member-driving apparatus – With interlock means
Patent
1989-04-06
1991-06-04
Bell, Paul A.
Elongated-member-driving apparatus
With interlock means
227130, 227156, 227120, B25C 104
Patent
active
050207121
ABSTRACT:
A fastener driving device of pneumatic type comprises a piston (20) within a cylinder (49), and a driver (21), connected to the piston (20) and movable through a fastener driving throat (26) formed by the housing of the device. A chamber (52) is provided within the housing to function as an air pressure reservoir. First and second valves (15) provide an appreciably lower pressurized air to the underside of the piston (20). The valves (15) are so arranged that when they are in a first position they allow a flow of pressurized air from the reservoir (18) to the underside of the piston (20) and after the pressurized air under the piston (20) increases to a reduced predetermined ratio to that in the reservoir (18), the valves (15) shift to a second position blocking the flow. The valves (15) are capable of shifting to a third position allowing communication of the air pressure under the piston (20) with atmosphere while continuing to block communication with the reservoir.
REFERENCES:
patent: 4736879 (1988-04-01), Yamada et al.
patent: 4784308 (1988-11-01), Novak et al.
patent: 4811882 (1989-03-01), Steeves et al.
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