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:
Apr. 07, 1998
Filed:
Sep. 25, 1995
Zbigniew Piech, East Hampton, CT (US);
Jerome F Jaminet, South Windsor, CT (US);
Thomas M Kowalczyk, Farmington, CT (US);
Edward E Ahigian, Arlington Heights, IL (US);
Richard E Kulak, Bristol, CT (US);
Thomas M McHugh, Farmington, CT (US);
Thomas He, Unionville, CT (US);
Richard E Peruggi, Glastonbury, CT (US);
David W Barrett, East Hartland, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
A linear induction motor utilizes a double-sided primary and a dual secondary to directly drive an elevator car door open and closed. The invention has the advantage of being compact: all magnetic-attractive loads are confined to a primary mount bracket, and all thrust loads are carried directly by the car header, not transferred to the cab. Also, high thrusts can be developed from a small space, i.e., short net working coil area, due to the double-sided primary winding and dual secondary arrangement. The configuration is basically simple, with a low moving mass and easy-to-fabricate parts, the primary core being particularly easily wound.