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. 25, 1987
Filed:
Jul. 29, 1986
Marwan E Hattem, Monroe, MI (US);
Calvin R Rushford, Reed City, MI (US);
Tubelite Division of Indall, Inc., Reed City, MI (US);
Abstract
A revolving door (10) adapted to be mounted in a doorway to provide access and egress. The door (10) revolves about a vertical axis and has an upper cam housing (20) and a lower cam housing (22). Radial slots (24) extend through cam housings (20, 22). Pins (26) engage slots (24) and secure doorwings (12) to upper and lower cam housings (20, 22). A mechanism is mounted within at least one of cam housings (20, 22) for permitting doorwings (12) to be collapsed in panic situations or to accommodate large objects. At least one of the upper and lower cam housings has lateral bores (34) extending therethrough and intersecting the radial slots (24) at right angles. The mechanism for permitting the cam housings to be collapsed includes a cam mounted on each pin securing the doorwing to the cam housing and a spring-biased detent mechanism mounted within the lateral bore. This arrangement of the spring-biased detent mechanism within the lateral bore permits easy access to the detent mechanism for adjusting the pressure or force at which the doorwings collapse without the necessity of disassembling the revolving door.