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:
Jul. 22, 2003
Filed:
Apr. 06, 2001
Kiyoji Minegishi, Aichi, JP;
Jun Tamenaga, Ohbu, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
A belt-type door opening and closing drive apparatus is provided, which can reduce the noise and dimensions thereof and make full use of the mechanical safety function in the event of an accident. The belt-type door opening and closing drive apparatus allows the output of a motor unit to drive a belt (timing belt), thereby opening and closing the door of an elevator cage or the like. Between the motor unit and the timing belt, interposed are planetary roller mechanisms for transmitting power by the mutual rotation of sun rollers, a plurality of planetary rollers supported rotatably by carriers and circumscribing the sun rollers, and ring rollers inscribed by the planetary rollers. The planetary roller mechanism receives the output from the motor unit and the output from the planetary roller mechanism is transmitted to the timing belt.