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US 4,721,423 AGranted
Chuck
AssigneeDaishowa Seiki Co., Ltd.
InventorHaruaki Kubo
Life of this patent
Estimating the term…
Abstract
A chuck allowing to mount a cutting tool on the spindle of a machine tool. The chuck includes an ahead projecting chuck cylinder provided on the one side of a chuck body in a mated fashion to each other, and a tightening rotary sleeve mounted through needle rollers outside the chuck sleeve, in addition, slits configured in the top end part of the chuck cylinder, wherein the rotation of the tightening rotary sleeve causes the slits to contract so that a cutting tool is gripped.
Claims13
A chuck comprising:
- a chuck body;
- a chuck cylinder for gripping a straight shank of a cutting tool directly or through a straight collet, which projects ahead from a one side of said chuck body in a mated fashion to each other and has a straight internal peripheral surface corresponding either to the straight shank of the cutting tool or to the straight collet as well as an external tapered peripheral surface;
- a tightening rotary sleeve having a tapered internal peripheral surface corresponding to said tapered external peripheral surface of the chuck cylinder so as to be fitted rotatably outside the chuck cylinder;
- a plurality of needle rollers being interposed between said rotary sleeve and said chuck cylinder in such a manner a to revolve spirally with relation to the external peripheral surface of the chuck cylinder;
- slits being configured substantially inwardly axially from a top end face of said chuck cylinder and radially at intervals around a top end part of the chuck cylinder while communicating with the internal and external peripheral surfaces which are opposite to one another.
2 more elements
Dependencies are inferred from the claim text.