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. 15, 1992
Filed:
Jan. 04, 1991
Applicant:
Inventors:
James G Retzloff, Lansing, MI (US);
Perin E Truax, Caledonia, MI (US);
Assignee:
The Viking Corporation, Hastings, MI (US);
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137527 ; 251337 ;
Abstract
A check valve assembly adapted for use in a fire protection system includes a housing defining an inlet, an outlet, a seat and a chamber. A clapper or valve element is mounted within the chamber for movement towards and away from the seat. A parallelogram linkage supports the clapper. A pair of draw bars extend diagonally between opposed links. Each draw bar defines a stop. A coil spring encircles the draw bars and engages the stops. Expansion of the coil spring forces the draw bars apart and resiliently biases the clapper or valve element against the valve seat.