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:
Jan. 30, 1990
Filed:
Sep. 26, 1988
Applicant:
Inventors:
Heinz S Wolff, London, GB;
David W Hawes, Cuckfield, GB;
Assignee:
Thomas Bolton & Johnson Limited, Staffordshire, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62C / ;
U.S. Cl.
CPC ...
169 37 ; 169 26 ; 169 38 ;
Abstract
A fire sprinkler has a flow passage for water or other extinguishing fluid closed by a frangible body, which may be a simple disc. A separate mechanism responsive to temperature-rise conditions shatters the frangible body, and the fluid then flows from the passage to impinge on a distributor (as in conventional sprinklers). The shattering mechanism is preferably actuated by a shape-memory alloy, preferably in sheet form, which can be located below the distributor for maximum exposure to radiant as well as convective heat; it can also be thermally insulated, contributing further to speed of response.