Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1991-08-08
1992-08-18
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
81475, B25B 23157
Patent
active
051389169
ABSTRACT:
A power operated screwdriver including a support shaft firmly secured to a motor housing, a gear driven by a motor shaft and rotatably mounted on the support shaft, a main spindle slidably mounted on the supported shaft and holding a detachable drill bit, and an intermediate clutch disc slidably mounted on the support shaft between the gear and the main spindle. The gear and the intermediate clutch disc are selectively connected and separated by a first clutch, while the intermediate clutch disc and the main spindle are always connected together by a second clutch. A compression coil spring acts between the support shaft and the intermediate clutch disc and urges the intermediate clutch disc toward the main spindle to disengage the first clutch. With this construction, the a rotational driving force of the gear is transmitted to the main spindle via the intermediate clutch disc and first and second clutches only when the screwdriver is performing a screw-driving operation. During a no-load rotation of the gear, the main spindle is separated from the gear so that the driver bit can be fitted in a groove in the head of a screw stably and reliably.
REFERENCES:
patent: 1744976 (1930-01-01), Levedahl
patent: 2690090 (1954-09-01), Pedersen
patent: 4630512 (1986-12-01), Durr
patent: 4655103 (1987-04-01), Schreiber et al.
patent: 4947714 (1990-08-01), Fluri
Nakagawa Atsushi
Sato Yuichi
Hitachi Koki Company Limited
Meislin D. S.
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