Mechanical lockout for a pneumatic tool

Details Mechanical lockout for a pneumatic tool Mechanical lockout for a pneumatic tool

1992-12-21

1994-06-14

Rada, Rinaldi I.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

173168, B25D 1710

Patent

active

053201876

ABSTRACT:
The invention is a safety mechanism for an air-powered tool. The mechanism senses the position of the tool's implement retainer and disables the air flow to the tool's motor if the retainer is not in its locked position. The mechanism employs a pushrod that has one end adapted to contact a rear surface of the retainer when the retainer is in its lock position. The other end of the pushrod is adapted to contact a spring-biased ball-type check valve located within the air inlet to the tool's motor. When the retainer is removed from the tool, the pushrod moves forwardly under the urging of the valve and at the same time allows the valve to move to its closed position to thereby prevent any flow of pressurized air to the motor.

REFERENCES:
patent: 1319034 (1919-10-01), App
patent: 1586865 (1926-06-01), Wade
patent: 1590269 (1926-06-01), Wade
patent: 1915071 (1933-06-01), O'Gorman
patent: 3950625 (1976-04-01), Klebe, Jr. et al.
patent: 4006786 (1977-02-01), Speicher
patent: 4546833 (1985-10-01), Berecz et al.
patent: 4597517 (1986-07-01), Wagdy
patent: 4846287 (1989-07-01), Ericsson
patent: 4848485 (1989-07-01), Piipponene et al.

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