Pneumatic powered fastener device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 4, 1991
Grant Date -
N/A
app pub date -
Apr 6, 1989
filing date -
Apr 7, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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