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:
Aug. 21, 1990
Filed:
Aug. 14, 1989
Richard E Haas, Fairfax, OH (US);
Thomas R Fegette, Batavia, OH (US);
Hydro Systems Company, Cincinnati, OH (US);
Abstract
A peristaltic pump includes rotor-mounted rollers biased apart and having end steps for engaging corresponding cam surfaces on the pump body and cover to direct non-pumping rollers in a predetermined path and maintain a constant tube engaging pressure on the pumping rollers. Radial pumping loads are transmitted through the rollers and biasing springs to the cam surfaces via rolling contact rather than to the rotor and its drive shaft. Drive shaft bearings are eliminated. The diameter of the end steps is different and preferably less than that of the tube engaging roller surface. Rollers having varying end steps are provided to accommodate different pumping tubes, desired spring pre-loads and the like.