Solenoid controlled air tool

Details Solenoid controlled air tool Solenoid controlled air tool

1986-08-14

1990-02-27

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 2, B23Q 500

Patent

active

049037838

ABSTRACT:
A positioning device having a chamber having a chamber exhaust valve in a first end and a chamber fluid inlet in a second end; a piston disposed in a chamber between the first end and the second end, the piston being slidable in the valve chamber between a first position toward the first end and a second position toward the second end; the fluid communication opening having a smaller cross-section area than the chamber exhaust valve; and a piston biasing spring urging the piston toward the chamber second end and away from the chamber first end, the piston biasing spring responsive to a fluid pressure differential between the first and second chamber ends above and below a predetermined level to move the piston into the first and second positions, respectively. Also, a power tool having a housing including a fluid supply inlet; a fluid operated motor assembly mounted in the housing, the motor assembly including a motor fluid inlet; a valve connecting the fluid supply inlet and the motor fluid inlet; the valve being operable between a first position permitting fluid communication between the fluid supply inlet and the motor fluid inlet and a second position restricting fluid communication between the fluid supply inlet and the motor fluid inlet; and a positioning device operatively connected to the valve, the positioning device having first and second positions corresponding to the valve first and second positions, respectively.

REFERENCES:
patent: 3983947 (1976-10-01), Wills et al.
patent: 4492146 (1985-01-01), Workman
patent: 4535850 (1985-08-01), Alexander
patent: 4576270 (1986-03-01), Baltz et al.
patent: 4721166 (1988-01-01), Clapp et al.

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