Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1989-08-14
1990-08-21
Smith, Leonard E.
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
604153, F04B 4312
Patent
active
049501364
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.
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Fegette Thomas R.
Haas Richard E.
Hydro Systems Company
Smith Leonard E.
Szczecina Jr. Eugene L.
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