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:
Jun. 18, 1996
Filed:
Oct. 07, 1994
Leo W Davis, Dallas, TX (US);
Other;
Abstract
A hydraulic system for exercise equipment and a method of providing resistance to piston motion in exercise equipment. The hydraulic system comprises: (1) a first piston in a first cylinder dividing an interior of the first cylinder into first and second chambers and having an end portion substantially sealing the first chamber of the first cylinder against fluid communication with the environment, the first cylinder further having a first fluid port, (2) a second piston in a second cylinder dividing an interior of the second cylinder into first and second chambers and having an end portion substantially sealing the first chamber of the second cylinder against fluid communication with the environment, the second cylinder further having a first fluid port, (3) an adjustable valve having a first valve fluid port coupled to the first fluid port of the first cylinder and a second valve fluid port coupled to the first fluid port of the second cylinder, (4) means for controllably adjusting a fluid resistance of the adjustable valve and (5) a compressible fluid substantially occupying the first chambers of the first and second cylinders.