Screwdriver having expanding and folding actions

Details Screwdriver having expanding and folding actions Screwdriver having expanding and folding actions

1998-08-03

2000-12-05

Scherbel, David A.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81437, 81490, 811774, B25B 2300

Patent

active

061551430

ABSTRACT:
The present invention relates to a screwdriver having expanding and folding action. The inside of its handle has a duct of the axial direction, a screw rod body penetrating the duct to slide back and forth, so as to jut out of the handle for a predetermined length, or to be received in the handle; a retaining device disposed in the handle and retains the rod body so as to cause the shank to be retained and located at a predetermined protruded length; the retaining device can be operated and controlled by a human hand to relieve the shank of the state of being retained.

REFERENCES:
patent: 1623906 (1927-04-01), Brooks
patent: 3601170 (1971-08-01), Sciascia
patent: 4002366 (1977-01-01), Hammes
patent: 4480668 (1984-11-01), Lin
patent: 5224402 (1993-07-01), Pettersson
patent: 5251520 (1993-10-01), Lanham

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