Screw joint tightening power tool

Details Screw joint tightening power tool Screw joint tightening power tool

1992-01-10

1993-04-13

Yost, Frank T.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

173176, 192 56R, B25B 2314

Patent

active

052013740

ABSTRACT:
Screw joint tightening power tool, comprising a rotation motor (13), a power control (34), and a torque responsive override clutch (15) coupling the motor (13) to an output shaft (16). A power control (34) actuating mechanism is associated with the clutch (15) and comprises a push rod (36) which in an ON-position rests axially against a transversely movable latch (41) and is released for axial displacement toward an OFF-position at relative rotation between the driving and driven halves (20, 22) of the clutch (15). The actuating mechanism further comprises balls (45) which are disposed in peripheral pockets (48) in one of the clutch halves, either of which balls (45) is arranged to cooperate with the latch (41) to shift the latter to a push rod (36) releasing position to, thereby, make the power control (34) shut off the power supply to the motor (13) as the clutch (15) overrides at a desired torque level.

REFERENCES:
patent: 3477521 (1969-11-01), Kiester et al.
patent: 3752277 (1973-08-01), Nakai
patent: 4307784 (1981-12-01), Smith
patent: 4951756 (1990-08-01), Everett et al.
patent: 5054588 (1991-10-01), Thorp et al.

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