Rotary power tool with expanded collet range

Details Rotary power tool with expanded collet range Rotary power tool with expanded collet range

1999-03-23

2000-12-05

Bishop, Steven C.

Chucks or sockets

Socket type

Spring biased jaws

279 463, 279 54, 408240, B23B 3120

Patent

active

061555762

ABSTRACT:
A rotary power tool designed to accept a wider range of tool shank diameters, and particularly larger diameters, without any special adapters, including a threaded output spindle with a stepped internal bore including an enlarged counter bore at its end. A one-piece collet having jaw segments, central shank portion, and a base is seated in the spindle bore so the jaw segments are cammed directly by the spindle end, and a collet nut threaded on the spindle, cams the distal ends of the jaw segments against the tool shank. The collet is designed so the larger tool shanks spread the jaws upon collet entry causing the shank portion of the collet to bulge outwardly as the collet jaws are cammed back into parallel relation against the large tool shank. This, in short, enables a smaller size collet to receive and clamp larger diameter tool shanks.

REFERENCES:
patent: 990087 (1911-04-01), Whitehead
patent: 2211216 (1940-08-01), Oster
patent: 4215871 (1980-08-01), Hirsch et al.

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