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1. (WO2018105161) CHUCK DEVICE

Pub. No.:    WO/2018/105161    International Application No.:    PCT/JP2017/024757
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Fri Jul 07 01:59:59 CEST 2017
IPC: B23B 31/12
Applicants: YUKIWA SEIKO INC.
ユキワ精工株式会社
Inventors: SAKAMAKI Kazuo
酒巻 和男
SAKAMAKI Koji
酒巻 孝次
TANIGUCHI Tadashi
谷口  正
AOYAGI Kazuki
青柳 和樹
Title: CHUCK DEVICE
Abstract:
The purpose of the invention is to provide a chuck device with which rotation in the loosening direction of a rotating tube during tool exchange is facilitated, and the service life of ratchet teeth is prolonged by inhibiting wear thereof. Provided is a chuck device that opens and closes multiple claws 3, which are inserted in a hole 2a provided on the tip of a main body 2, by rotating a rotating tube 1 and that grips a tool 4 with said claws 3, wherein: a ring-shaped rotating body 8, which screwably engages with the claws 3 and rotates together with the rotating tube 1, is fitted on the main body 2 on the inside of the rotating tube 1; a ratchet teeth 5 ring is provided on the main body 2 or the rotating body 8; a detachable locking spring 9 that engages with the ratchet teeth 5 is provided; and an unlocking mechanism is provided so that when the rotating force in the tightening direction is reduced to zero after the gripping force on the tool 4 has reached a specified value due to rotation of the rotating tube 1 in the tightening direction, the unlocking mechanism forcibly releases the engagement of the ratchet teeth 5 with the locking spring 9.