Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1986-10-22
1988-07-05
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 60, B25B 2100
Patent
active
047546697
ABSTRACT:
In a portable motorized screwdriver, in order to provide for manual use of the screwdriver, to finish screwing in a screw, for example, or to start unscrewing a screw, a mechanism is provided for locking the spindle. This mechanism is coupled to the switch used to start and stop rotation of the spindle. This coupling is arranged so that operation of the switch to start rotation of the spindle is accompanied by unlocking of the spindle and so that returning the switch to the position to stop rotation of the spindle locks the spindle. The locking mechanism is arranged so that when the spindle is locked the screwdriver may be used as a ratchet type manual screwdriver.
REFERENCES:
patent: 3638519 (1970-06-01), Rebold
patent: 3673921 (1972-07-01), Fritts et al.
patent: 3802518 (1974-04-01), Albert
patent: 4078589 (1978-03-01), Miller
patent: 4448098 (1984-05-01), Totsu
Serriere Alain
Verdier Alain
Bartlett Edward D. C.
Black & Decker Inc.
Dearing Dennis
Murphy Edward D.
Schmidt Frederick R.
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