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:
Mar. 10, 1992
Filed:
Sep. 07, 1990
Applicant:
Inventors:
Koichiro Kitamura, Takaoka, JP;
Katsuji Taniguchi, Takaoka, JP;
Assignee:
Kitamura Machinery Co., Ltd., Toyama, JP;
Primary Examiner:
Int. Cl.
CPC ...
E16C / ;
U.S. Cl.
CPC ...
384518 ; 384563 ;
Abstract
A preload control apparatus for use in a spindle (12) of a machine tool comprises a bearing (16,17) and a plurality of springs (26a to 26d) for exerting a preload on the bearing (16, 17). Some or all of the springs (26a to 26d) are at least partly made of a shape memory alloy so that the preload on the bearing (16,17) can be adjusted with changes in temperature of the springs (26a to 26d).