Self-centering four-jaw chuck

Abstract

A chuck has a chuck body centered on and rotatable about a body axis, two first jaws diametrally flanking the body axis, each formed with an angled actuation face, and radially shiftable in the chuck body, and two second jaws diametrally flanking the body axis, each formed with an angled actuation face, interleaved with the first jaws, and radially shiftable in the chuck body. An inner sleeve engages the actuation faces of the first jaws and is axially shiftable to radially shift the first jaws, and an outer sleeve engages the actuation faces of the second jaws and is axially shiftable to radially shift the second jaws. An axially shiftable actuation element carries a pivotal force-transmitting rocker having inner and outer ends operatively engaging the respective inner and outer sleeves for axially shifting the inner and outer sleeves on axial shifting of the element while permitting limited axial movement of the inner and outer sleeves relative to each other.

Dependencies are inferred from the claim text.