Tools – Wrench – screwdriver – or driver therefor – Responsive to movement of work
Patent
1987-12-04
1989-03-07
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Responsive to movement of work
81 583, B25B 2300
Patent
active
048095729
ABSTRACT:
A power driven screwdriver includes a housing, a drive motor mounted within the housing, and a main gear rotatably driven by the drive motor. A spindle is axially movably supported within the housing and has a driver bit secured thereto. The spindle has a groove formed in the rear end thereof. A claw clutch mechanism is provided and is actuated by axial movement of the spindle so as to transmit and disconnect the rotation of the main gear to the spindle. The claw clutch mechanism includes a fixed clutch member formed on the main gear and a movable clutch member mounted on the spindle adjacent the rear end thereof. The movable clutch member has a groove formed in the forward end thereof in opposed relation to the groove of the spindle. One of the grooves of the spindle and the movable clutch member is configured to form an axially inclined groove. Engaging means is interposed between the groove of the spindle and the groove of the movable clutch member. A spring is positioned between the main gear and the movable clutch member and is adapted to normally urge the movable clutch member in a direction away from the fixed clutch member.
REFERENCES:
patent: 1744976 (1930-01-01), Levedahl
patent: 2566183 (1951-08-01), Forss
patent: 2790471 (1957-04-01), Graybill
patent: 3454059 (1969-07-01), Sindelar
patent: 3527273 (1970-09-01), Falter
patent: 4630512 (1986-12-01), Durr
Makita Electric Works Ltd.
Rachuba Maurina
Schmidt Frederick R.
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