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:
Dec. 19, 1989
Filed:
May. 04, 1989
Joseph A Birli, Sr, Richmond Heights, OH (US);
Joseph A Birli, Jr, South Euclid, OH (US);
Design & Manufacturing Corporation, Willoughby, OH (US);
Abstract
An electro-thermal actuator has a boiler chamber in which a working fluid is heated to increase its pressure and a variable volume chamber defined in part by a rolling diaphragm. When the working fluid is heated to a sufficient temperature, the pressure within the variable volume chamber becomes large enough to force a spring-loaded piston rod out of the actuator by the rolling motion of the diaphragm. The boiler chamber communicates with the variable volume chamber through a flexible partition containing a normally closed opening consisting a single slit. The flexible partition absorbs external forces applied to the piston rod when it is extended without the rupture of any actuator parts. In addition, the flexible partition produces improved actuator response time.