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. 23, 1991
Filed:
Feb. 26, 1990
Keiichiro Nakai, Tokyo, JP;
Yoshinori Nakanishi, Shibayama, JP;
Otis Elevator Company, Farmington, CT (US);
Abstract
An apparatus for maintaining an air gap between a stationary and a moving element of a toroidal linear motor which provides motive force to an elevator, comprises; a plurality of rollers mounted upon the moving element, and a means for biasing the rollers towards a central axis of the stationary element, and for cooperating with the rollers to maintain the air gap when power to the motor is shut off or vibration or other forces would tend to lessen the gap below a predetermined minimum. The rollers are arranged angularly about the stationary element and rotate due to the relative rotation of the moving and stationary elements.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile