Electrically driven screw-driver

Details Electrically driven screw-driver Electrically driven screw-driver

1982-03-10

1984-05-15

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81 5711, 81 5731, B25B 2314

Patent

active

044480989

ABSTRACT:
An electrically driven screw-driver is disclosed in which a ratchet device is mounted to a portion of a chucking shaft to which a driver bit is detachably connected and the chucking shaft is connected to an output shaft of an electric motor through a planetary reduction system and in which a torque controlling mechanism having a clutch function is mounted to the planetary reduction system. In accordance with the electrically driven screw-driver, a combination of the ratchet device and the torque controlling mechanism permits the screw-driver to be operated in such a way that only the prefastening, or screwing step may be carried out mechanically and electrically while the finishing step of strong fastening may be performed manually, resulting in a very compact and light screw-driver which is very convenient in portability.

REFERENCES:
patent: 2031133 (1936-02-01), Schumann
patent: 2715955 (1955-08-01), Stone
patent: 2773370 (1956-12-01), Intraub et al.
patent: 2979089 (1961-04-01), Piesker
patent: 4086831 (1978-05-01), Smith
42,559/71, Jul. 25, 1968, Tonichi Seisakusho KK, Japan.

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