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:
Aug. 30, 1994
Filed:
May. 08, 1992
Applicant:
Inventor:
Redreddy S Reddy, Evanston, IL (US);
Assignee:
Mark IV Transportation Products Corporation, Niles, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E05F / ; F16H / ;
U.S. Cl.
CPC ...
49362 ; 74458 ;
Abstract
Rotary locks used on transit vehicle doors when opened and closed by a rotating helical door drive member. In a preferred embodiment, a first lock utilizes a negative thread portion of the helical drive. A second lock utilizes a rotating lock pawl and stop. The drive and lock can be used to operate door systems with and without separate door hangers. Compensation for camber variations in car structure is provided through the use of spherical mounts or drive member journals.