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:
Feb. 12, 2002
Filed:
Apr. 18, 2001
Toyonobu Sakurai, Ibaraki, JP;
SMC Corporation, Tokyo, JP;
Abstract
The piezoelectric element laminate which expands due to application of a voltage is disposed between a diaphragm valve applied with elastic force in a valve opening direction and a valve spring mechanism , a distortion amount a of the piezoelectric element laminate in expansion is set to be larger than an opening/closing stroke b of the diaphragm valve , and a spring seat separates from a second stopper due to a difference c between the distortion amount a and the opening/closing stroke b. As a result, when the piezoelectric element laminate expands to seat the diaphragm valve on a valve seat , the valve spring is compressed and repulsing force of the valve spring acts on the diaphragm valve through the piezoelectric element laminate and the diaphragm valve is pressed against the valve seat by the repulsing force.