Title: Door closure device

Abstract: A safety device for automatically closing a door in response to a predetermined condition, such as fire, is provided by a selectively disengageable brake operatively associated with a pivotable door closure arm. The brake includes a flexible cable wrapped around a brake drum, and means to selectively tighten the cable around the drum. A crank-pin rotates conjointly with the drum and engages the door closure arm to expeditiously close the door in the event of fire.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Farris, Vernie L. (Houston, TX, US)

Application Number: 538762
Filing Date: 1975-01-06
Publication_date: 1976-01-27
Assignee: Federal Sign and Signal Corporation (Blue Island, IL)
Primary Class(es): 16/48.5 16/70, 188/77W
Other Classes:
US Patent Ref:

2098501	Nov, 1937	Lasier	16/49.
2874960	Feb, 1959	Durbin et al.	16/82.
3038195	Jun, 1962	Bardfeld	16/49.
3405791	Oct, 1968	Kaplan	188/77.
3648326	Mar, 1972	Gaysowski	16/48.
3777423	Dec, 1973	Coulter	16/48.
3778866	Dec, 1973	Nakanishi	16/49.

Other Refs:
Primary Examiner: Schroeder, Werner H.
Assistant Examiner: Shedd, Wayne L.
Attorney: Pigott, Jr.; Charles F.