Power screw driver

Details Power screw driver Power screw driver

1996-11-15

1998-07-07

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81475, 192 5654, 173178, B25B 23157

Patent

active

057751862

ABSTRACT:
A power screw driver for tightening self-tapping screws comprises a housing (10), a rotation motor, an output shaft (12), a torque limiting release clutch (11) having torque transferring cam unit (17, 19) and a spring biassed thrust element (20) exerting an engagement force on the cam unit (17, 19) and yielding axially to a release position as a desired output torque is reached. A screw bed (32) engaging contact member (31) coupled is to an activation unit (42) and is arranged to be axially displaced via the activation unit (42) of the activation means (42) a lock means (36, 39) from a thrust element (20) locking position during the thread forming phase of the tightening process to a thrust element (20) unlocking position during the final pretensioning phase.

REFERENCES:
patent: 3934629 (1976-01-01), Boman
patent: 5201374 (1993-04-01), Rahm

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