Chucks or sockets – Socket type – Self-grasping
Patent
1979-11-19
1981-12-15
Baldwin, Robert D.
Chucks or sockets
Socket type
Self-grasping
279 59, 279 64, 279 72, B23B 3112
Patent
active
043055974
ABSTRACT:
A bi-directional, self-tightening chuck for releasably gripping a tool bit such as a twist drill or the like includes a bit receiving nosepiece having a conical, internal opening formed therein. A control sleeve is rotatably mounted, through a thrust bearing, on the nosepiece and is adjustably connected to a chuck body to enable adjustment of the axial position of the nosepiece relative to the chuck body. Tapered gripping elements, which may take the form of cone-like gripping rollers or wedge-like jaws, are located in the internal opening of the nosepiece and are adapted to forcibly grip the stem portion of the tool bit in response to a hand-tightening adjustment of the control sleeve on the chuck body and further adapted to self-tighten in response to an axially directed thrust force applied to the gripping elements by a torque-responsive cam assembly. The cam assembly is located between the gripping elements and the chuck body and develops the axial thrust force in response to the torque applied through the tool bit to cause the gripping elements to self-tighten. In the preferred embodiment, the torque responsive cam assembly includes opposed, axial-face cams each having complementary sets of oppositely inclined ramp surfaces formed thereon with ball elements separating the cams. The torque applied through the tool bit causes the face cams to rotate relative one another to develop and apply the axially directed thrust force to the gripping elements to increase the gripping force.
REFERENCES:
patent: 2910302 (1959-10-01), Ondeck
patent: 4252333 (1981-02-01), Vogel
Baldwin Robert D.
Black & Decker Inc.
Bloom Leonard
Murphy Edward D.
Weinstein Harold
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