Screw extracting device

Details Screw extracting device Screw extracting device

1978-08-01

1980-05-27

Jones, Jr., James L.

Metal working

Method of mechanical manufacture

Disassembling

81 532, B23P 1902, B25B 1350

Patent

active

042043085

ABSTRACT:
A screw extracting device is provided for removing screws which cannot be removed with an ordinary screwdriver. The device comprises an elongate rod, a handle located at one end of the rod, a plurality of gripping fingers located at the other end of the rod for gripping the screw to be extracted a sleeve, threaded for movement along the rod, for controlling contraction and expansion of said gripping fingers in accordance with the longitudinal position of said sleeve along the rod so as to provide gripping and release of the screw head. The fingers each include a tapered tip portion which permits the fingers to be driven into the surface surrounding the head of the screw to be extracted and gripping ridges or the like for providing firm gripping of the screw head. A method of using the device is also enclosed.

REFERENCES:
patent: 1116532 (1914-11-01), Armstrong
patent: 1141741 (1915-06-01), Wiseman
patent: 2750821 (1956-06-01), Hilsinger
patent: 3735650 (1973-05-01), Weng
patent: 4078766 (1978-03-01), Saurwein

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