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. 04, 2000
Filed:
Aug. 19, 1998
David R Seward, Houston, TX (US);
Paul A Biek, Houston, TX (US);
Cooper Technologies, Houston, TX (US);
Abstract
A reversible double-throw air motor provides for forward and reverse operation by having a cylinder member rotate relative to a stationary valve plate between fixed forward and reverse positions of the cylinder member. The valve plate has diametrically opposite pressure ports and diametrically opposite exhaust ports at an end surface that faces the cylinder member. The cylinder member has a transfer passage associated with each quadrant of the inner surface, the transfer passages opening at wall ports at the inner surface close to each of the two bottom dead center lines. In the forward position of the cylinder, pressure is supplied from the pressure ports in the valve plate through two of the transfer passages to opposite quadrants while the other two quadrants are open to the exhaust ports in the valve plate. For reverse operation, the cylinder is rotated, which reverses the quadrants open to the pressure and exhaust paths. The transfer passages of the cylinder that are associated with exhaust quadrants in each mode communicate the exhaust quadrants with portions of the valve exhaust ports. Instead of being in a separate valve plate, the pressure and supply ports can be in an end surface of the body of the motor.