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:
Dec. 05, 1995
Filed:
Aug. 17, 1993
Yoshio Nishi, Osaka Sayama, JP;
Haruo Kubota, Osaka Sayama, JP;
Yasuo Wada, Osaka Sayama, JP;
Yoshio Ueno, Osaka Sayama, JP;
Munenobu Honda, Osaka Sayama, JP;
Elephant Chain Block Company Limited, Osaka, JP;
Abstract
A hoist and traction machine having a mechanical brake (13), wherein a not-relative (14)-rotatable operating handle (18) is axially movably an interposed between a stopper (17) provided at an axial end of a driving shaft (5) and a driving member (8) threadedably engaged with the driving shaft (5). Between the operating handle (18) and the stopper (17) there is provided an elastic biasing member (19) for biasing the operating handle (18) toward the driving member (8) The operating handle (18) is provided with engaging projections (31), the driving member (8) is provided with free rotation control surfaces (35) in elastic contact with the engaging projections (31) respectively, and the free rotation control surfaces (35) are formed in gradient surfaces for applying resistance against movement of the driving member (8) in the return direction with respect to free rotation operation by the operating handle (18) so as to enable the free rotation control state to be held up to a desired value, whereby an input range of a pulling force of a chain during the free rotation control is expanded without reducing operability of free rotation operation.