192 clutches and power-stop control – Clutches – Automatic
Patent
1996-08-26
1998-04-21
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Automatic
81 54, 173 93, 173179, B25B 1500
Patent
active
057408920
ABSTRACT:
A torque transmission mechanism to be used in a power wrench includes a body driven by a motor, having a central bore to rotatably support therein a toothed end of an output shaft. The toothed end of the shaft has a pair of diametrically opposite teeth, each defined by two circumferentially opposite contact faces that extend along radii of the output shaft. The body has a radial notch communicating the bore with a coupling member pivotally received therein. The coupling member has two opposite wings alternately movable into the bore with the rotation thereof to selectively engage one of the teeth for driving the shaft. A centrifugal clutch is provided between the body and the motor to control the movement of the wings. The control comprises two pins movable between an engagement position where the pins engage the coupling member and prevents the wings of the coupling member from moving into the bore and a disengagement position where the pins disengage from the coupling member and the coupling member is allowed to rotate freely. The pins have circumferential grooves to be loosely received within open slots provided on the clutch, while maintaining the pins thereon, to accommodate sideways force applied thereto so as to increase the service life thereof.
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patent: 5412546 (1995-05-01), Huang
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