Restrictive trigger actuated valve arrangement for a fastener dr

Details Restrictive trigger actuated valve arrangement for a fastener dr Restrictive trigger actuated valve arrangement for a fastener dr

1987-10-26

1989-03-14

Bell, Paul A.

Elongated-member-driving apparatus

With interlock means

227130, B25C 104

Patent

active

048118826

ABSTRACT:
A valve arrangement for a fastener driving tool of the type having a cylinder and piston/driver assembly for driving a fastener, a main valve which, when actuated, opens the cylinder to air under pressure causing the piston/driver assembly to drive a fastener, a remote valve which, when actuated, causes the main valve to open, and a trigger actuated valve together with a workpiece responsive safety actuated valve which, when both are actuated, actuate the remote valve, the valve arrangement being such that the safety actuated valve must be actuated before the trigger actuated valve in order for the remote valve to the actuated. The trigger actuated valve has a trigger-operated stem slidably mounted within a valve body. The body defines a chamber in which one end of the remote valve stem is slidingly and sealingly engaged. Air under pressure within the chamber maintains the remote valve stem in an unactuated position. A passage in the tool body connects the trigger actuated valve to the safety actuated valve. The chamber is connected to said passage when the trigger actuated valve is open. The passage is connected to atmosphere when the safety actuated valve is open. One of the trigger actuated valve and the safety actuated valve is an on-off valve and the other is a pressure controlled valve. The pressure controlled valve precludes connection of the chamber to atmosphere via passage to shift the remote valve stem to its actuated position unless the safety actuated valve is opened prior to the opening of the trigger actuated valve.

REFERENCES:
patent: 3677456 (1972-07-01), Ramspeck et al.
patent: 3677457 (1972-07-01), Ramspeck et al.
patent: 3888404 (1975-06-01), Ramspeck et al.
patent: 4378084 (1983-03-01), Scala
patent: 4405071 (1983-09-01), Austin
patent: 4550643 (1985-11-01), Schwartzenberger
patent: 4629106 (1986-12-01), Howard et al.

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