The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Mar. 02, 1993
Shigeru Suzuki, Kawasaki, JP;
Motonori Kobara, Futtu, JP;
Yasuhiro Hisatomi, Futtu, JP;
Yoshinori Yamaguchi, Yamatokoriyama, JP;
Hiroshi Yonetani, Yamatokoriyama, JP;
Kiyoyuki Fukushima, Yamatokoriyama, JP;
Yoshimasa Sakamoto, Yamatokoriyama, JP;
Toru Yagami, Yamatokoriyama, JP;
Toshihide Kamei, Yamatokoriyama, JP;
Takahiro Kobi, Yamatokoriyama, JP;
Yoshiaki Sugimoto, Yamatokoriyama, JP;
Nobuyuki Kimura, Yamatokoriyama, JP;
Kuroda Seiko Co., Ltd., Kawasaki, JP;
Mori Seiki Co., Ltd., Yamatokoriyama, JP;
Abstract
This invention provides a tool clamping/unclamping device which allows a tool to be replaced simply and securely by another one in short time, and which prevents a lock nut from being loosened, from yielding a difference in phase, and from dropping off with respect to a main shaft. The tool clamping/unclamping device comprises a tool urging means for holding a tool holding member in its clamped state, a nut positioning means for adjusting the lock nut in its phase in rotation angle position with respect to the main shaft, a nut drop-off preventing means for regulating the amount of rotation angle of the nut, a nut loosening detection means for detecting the position of the nut in the direction of the main shaft, and/or a locking mechanism for engaging a steel ball urged by a spring with a lock hole to thereby lock the lock nut in the direction of rotation. Further, for a hollow main shaft, a relay member is attached thereto, the relay member being formed similarly to the lower end portion of the solid main shaft.