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:
Sep. 27, 2005
Filed:
Dec. 23, 2003
Haibo Tong, Palatine, IL (US);
Marianne Krbec, Elmhurst, IL (US);
Haibo Tong, Palatine, IL (US);
Marianne Krbec, Elmhurst, IL (US);
Westinghouse Air Brake Technologies Corporation, Wilmerding, PA (US);
Abstract
A lock mechanism for a rotary door operator of a transit vehicle includes a lock member pivotally connected to a block cylinder and pivotally connected to a mounting bracket. Such lock member is rotatable in a locking direction to a predetermined position under a block member connected to the output shaft for preventing an axial linear movement of the door post which is connected to a door during the loss of fluid pressure. The block cylinder rotates the lock member to an unlocking position during normal operation to enable opening of the door. A lock sensing switch provides a feedback on the lock condition to the transit vehicle control system.