Drill chuck

Cutting by use of rotating axially moving tool – Tool or tool-support with torque-applying clutch – Friction clutch

Reexamination Certificate

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Details

C279S060000, C279S902000

Reexamination Certificate

active

07850404

ABSTRACT:
A drill chuck has a rotatable chuck body, a tightening sleeve axially fixed but rotatable on the chuck body, a plurality of jaws on the body and radially displaceable between inner and outer end positions, and a screwthread formation for radially displacing the jaws between their end positions on relative rotation of the body and sleeve. An inner element rotationally fixed on the chuck body has an elliptical outer surface generally centered on the axis and bearing on a flexible coupling ring having an annular array or radially outwardly projecting coupling teeth. First and second rings each have an annular array of radially inwardly projecting teeth meshing with the coupling teeth. The first ring is fixed and second ring is rotatable relative to the chuck body adjacent the first ring. The second-ring array of teeth has a number of teeth different from that of the first-ring array of teeth.

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patent: 2010/0181735 (2010-07-01), Zhou et al.
patent: 2010/0207336 (2010-08-01), Mack

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