Fastener driving tool

Details Fastener driving tool Fastener driving tool

1989-03-31

1991-09-10

Yost, Frank T.

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including supply magazine for constantly urged members

173139, B25C 104

Patent

active

050466534

ABSTRACT:
A fastener driving tool such as a pneumatic nailing machine drives a fastener into a workpiece under a fluid pressure supplied into an upper chamber in a cylinder and applied to a piston reciprocally movably disposed in the cylinder. When the fastener being driven is stopped in a power stroke of the piston due to a pressure shortage, the fluid flows from the upper chamber into a lower chamber in the cylinder to make the pressure in the lower chamber equal to or higher than the pressure in the upper chamber. No reactive forces are thus applied by the high pressure in the upper chamber to the fastener driving tool, and the fastener driving tool is prevented from being repelled back when the fastener is stopped. The fastener can then be driven home into the workpiece in successive power strokes of the piston.

REFERENCES:
patent: 2983922 (1961-05-01), Juilfs
patent: 3205787 (1965-09-01), Volkmann
patent: 3605560 (1971-09-01), Bolte
patent: 3808620 (1974-05-01), Rothfuss et al.
patent: 4436237 (1984-03-01), Vornberger et al.
patent: 4480528 (1984-11-01), Shiroyama
patent: 4509669 (1985-04-01), Elliesen
patent: 4549344 (1985-10-01), Nikolich

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