| 摘要 |
A chuck has a chuck body rotatable about a chuck axis and subdivided along a plane perpendicular to this chuck axis into a front chuck part and a rear chuck part integrally connected together. The rear chuck part is formed with a plurality of angularly spaced and radially extending rear T-section guide grooves opening axially forwardly at the plane and each having a pair of radially extending sides each in turn formed with a step extending parallel to and backwardly offset from the plane. The front chuck part is formed in axial alignment with the rear guide grooves with respectively angularly spaced and radially extending guide grooves opening axially forwardly. The front chuck has a backwardly facing planar face lying on the plane and forwardly closing the rear guide groove. Respective webs form the bases of the backwardly closed front guide grooves, and are formed with radially throughgoing apertures substantially smaller than the respective front guide grooves. Respective rear jaw parts are radially displaceable in the rear guide grooves and each have a pair of oppositely projecting ridges each in turn having a rear face riding on the respective step and a front face riding on the rear face of the front chuck part. |
