Thomas R Fegette

US Patent:

49501364, Aug 21, 1990

Filed:

Aug 14, 1989

Appl. No.:

7/393899

Inventors:

Richard E. Haas - Fairfax OH
Thomas R. Fegette - Batavia OH

Assignee:

Hydro Systems Company - Cincinnati OH

International Classification:

F04B 4312

US Classification:

417477

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.