Pneumatic or pressurized fluid tool having a control device

Details Pneumatic or pressurized fluid tool having a control device Pneumatic or pressurized fluid tool having a control device

1997-11-12

1999-06-22

Smith, Scott A.

Tool driving or impacting

Passage in manipulating handle for drive motor motive fluid

Motive fluid control valve in handle passage

173170, 173218, B23B 4504

Patent

active

059133708

ABSTRACT:
Pneumatic or pressurized fluid tool, such as a screwdriver, having a control device. The control device includes a pivotally mounted trigger which causes rotation of the motor in a first rotational direction when pivoted in a first direction and which causes rotation of the motor in an opposite rotational direction when pivoted in a second direction opposite to the first direction. The trigger is connected to a piston which is movable in a cylinder. The piston is connected by a rod to a valve and includes a cam. The cam of the piston, cooperating with a plunger, operates a selector so that when the trigger is pivoted in the first direction, compressed air or pressurized fluid is admitted to rotate the motor in the first direction. If the trigger is pivoted in the second direction, the cam, cooperating with the plunger, moves the selector to close an inlet passage corresponding to the first rotational direction of the motor and opens a second inlet passage corresponding to the opposite rotational direction of the motor.

REFERENCES:
patent: 3181672 (1965-05-01), Swanson
patent: 3352323 (1967-11-01), Wickham
patent: 3402778 (1968-09-01), Carter
patent: 3556230 (1971-01-01), Roggenburk
patent: 4088197 (1978-05-01), Roll et al.
patent: 4708210 (1987-11-01), Rahm
patent: 4822264 (1989-04-01), Kettner
patent: 5083619 (1992-01-01), Giardino
patent: 5199460 (1993-04-01), Geiger
patent: 5377769 (1995-01-01), Hasuo
patent: 5531279 (1996-07-01), Biek

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