Pneumatic fastener driving tool

Details Pneumatic fastener driving tool Pneumatic fastener driving tool

1989-12-07

1992-08-04

Yost, Frank T.

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including means other than the driver to separate leading...

227130, B25C 104

Patent

active

051351528

ABSTRACT:
A pneumatic fastener driving tool includes a main valve operable to cause compressed air to be alternately introduced into and discharged from the upper piston chamber, a first passage leading the compressed air into the main valve chamber, a repeat valve disposed in the first passage for opening and closing the same, and a second passage extending between the lower piston chamber and a repeat valve chamber in which the repeat valve is reciprocably received. With this construction, the repeat valve is reciprocally movable in response to a change of pressure in the lower piston chamber to cause the main valve to reciprocate, thereby reciprocating the piston repeatedly. Since the reciprocating fastener driving movement of the piston is directly related to the reciprocating movement of the repeat valve, the fastener driving work can be achieved reliably without causing any operational failure such as a non-load striking.

REFERENCES:
patent: 3567098 (1971-03-01), Maynard
patent: 4149297 (1979-04-01), Monacelli
patent: 4344555 (1982-08-01), Wolfberg
patent: 4436237 (1984-03-01), Vornberger et al.
patent: 4784308 (1988-11-01), Novak et al.

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