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:
Nov. 22, 1994
Filed:
Nov. 12, 1993
Applicant:
Inventor:
Heinfried Hoffmann, Frankfurt, DE;
Assignee:
Samson Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137 67 ; 137 79 ; 251 14 ; 251 90 ;
Abstract
An actuating drive, particularly for control valves and shut-off valves or the like, comprising a safety device that automatically brings an actuation element into a safety position, particularly a closed position, given a limit temperature that upwardly exceeds the normal temperature range, particularly in case of fire, having a swelling compound that presses the actuation element in the direction toward the safety position when it expands and which multiplies in volume upon formation of cavities when the limit temperature is upwardly exceeded.