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:
Jul. 30, 2002
Filed:
Sep. 21, 2001
Natan E. Parsons, Brookline, MA (US);
Robert S. Shamitz, Brighton, MA (US);
Kay Herbert, Winthrop, MA (US);
Arichell Technologies, Inc., West Newton, MA (US);
Abstract
By depressing a push button ( ), a user deforms a flexible diaphragm ( ) and thereby causes an incompressible fluid to flow from a first actuation-chamber segment ( ) through openings ( ) in a divider wall ( ) and into a second chamber segment ( ). That flow deforms a second flexible diaphragm ( ), which accordingly causes an actuator shaft ( ) to break the seal formed by an O-ring ( ) and thereby permit flow from a main valve inlet ( ) through a main valve outlet ( ). When the user releases the push button ( ), an actuator check valve ( ) prevents the incompressible fluid from returning through the divider-wall openings ( ) to the first chamber segment ( ). The actuator therefore returns only slowly, through a bleed orifice ( ). A pressurizer conduit ( ) communicates the valve's outlet pressure to a stop chamber ( ) and thereby causes the position of a stop member ( ) to be dependent on that pressure. The position of the stop member ( ) determines the length of the button travel and thus the time required for the valve to close. This reduces the effect of inlet pressure on the amount of fluid that one valve operation causes to be delivered.