[54] PERISTALTIC PUMP HAVING A MOTOR OVERLOAD PROTECTOR
[75] Inventor: Shigeru Okada, Fujinomoya, Japan
[73] Assignee: Terumo Kabushiki Kaisha, Japan
[21] Appl. No.: 867,061
[22] Filed: Apr. 10,1992
Related U.S. Application Data
[63] Continuation of Ser. No. 558,051, Jul. 25, 1990, abandoned.
[30] Foreign Application Priority Data
Jul. 31, 1989 [JP] Japan 1-196515
Jul. 31, 1989 [JP] Japan 1-196516
[51] Int. C1.5 F04B 43/12
[52] U.S. Q 417/474; 604/153
[58] Field of Search 417/474, 475; 604/153
[56] References Cited
U.S. PATENT DOCUMENTS
2,877,714 3/1959 Sorg et al 417/474 X
3,778,195 12/1973 Bamberg 417/474
4,493,706 1/1985 Borsanyi et al 417/474 X
4,861,830 12/1985 Bradley 417/474
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US005211548A
[ii] Patent Number: 5,211,548 [45] Date of Patent: May 18,1993
4,725,205 2/1988 Cannon et al 417/474 X
4,728,265 3/1988 Cannon 417/474 X
4,954,043 9/1990 Irvin et al 417/474 X
FOREIGN PATENT DOCUMENTS
56-113084 9/1981 Japan .
62-20182 2/1987 Japan .
Primary Examiner—Leonard E. Smith
Attorney, Agent, or Firm—Frishauf, Holtz, Goodman &
Woodward
[57] ABSTRACT
A peristaltic pump in which a tube is stably supported by a platen so as to be stably collapsed by fingers during normal operation, whereas, when an excessively large collapsing force is exerted by one of the fingers, the excess portion of the force is absorbed without fail so as to realize a stable pumping operation. The level Ot ability for absorbing the excess collapsing force is easily adjustable in accordance with changes in conditions such as the elasticity of the tube and the size of the tube. The tube can be stably set in a proper position between the platen and a group of the fingers.
3 Claims, 6 Drawing Sheets
