Flexible tube pump having linear cam actuation of distributor means
First Claim
1. A peristaltic-type metering pump comprising:
- a. a housing;
b. elongated tubing means supported in said housing, said tubing means including an inlet end adapted to be connected to a source of fluid to be pumped and an outlet end;
c. an inlet plunger, an extruder plunger and an outlet plunger arranged serially in said housing in opposition to and along the length of said tubing means in said housing, said inlet, extruder, and outlet plungers being further arranged to be displaced and to thereby apply compressive forces to said tubing means;
d. a linear actuator;
e. primary cam means slidably mounted in said housing and responsive to said linear actuator for displacing said inlet and said outlet plungers in a predetermined timed relationship with respect to each other to thereby apply said forces to said tubing means, said primary cam means being comprised of first and second axially spaced apart sections; and
f. secondary cam means located between said first and second sections responsive to the movement of said first cam means for displacing said extruder plunger in a predetermined time relationship with respect to the displacement of said inlet and outlet plungers, said secondary cam means being slidably mounted on said primary cam means and arranged to be displaced in one axial direction by a portion of one of said primary cam means sections and to be displaced in the opposite axial direction by the other of said primary cam means sections.
5 Assignments
0 Petitions
Accused Products
Abstract
A precision metering and dispensing pump of the peristaltic type is disclosed. The pump includes a housing in which an elongated, compressible fluid extruding tube is disposed. The tube has an outlet that is adapted to be connected to the source of fluid that is to be pumped. Spaced serially along the tube and in opposition thereto are an inlet plunger, an extruder plunger and an outlet plunger all of which constitute valves and which are arranged to be displaced in such a manner as to apply compressive forces to the tube. A linear actuator is mounted on the housing and is coupled to a primary, two-part cam that is arranged to linearly displace the inlet and the outlet plungers at preselected times. Displacement of the primary cam causes the displacement of a secondary cam to the movement of which is responsive the extruder plunger. The primary cam acts on the outlet plunger which, at the beginning of the cycle is extended so as to close the tube. Fluid will flow into the tube up to the point where the outlet plunger has sealed the tube. Further movement of the primary cam will cause the inlet plunger to close the tube so that the fluid to be pumped is trapped between the inlet plunger and outlet plunger. Still further movement of the primary cam in the same direction will cause the secondary cam to move and thereby displace the extruder plunger while at the same time retracting the outlet plunger so that the fluid passage to the outlet is opened thereby completing the cycle after which the actuator is reversed and the cycle is repeated.
80 Citations
5 Claims
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1. A peristaltic-type metering pump comprising:
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a. a housing; b. elongated tubing means supported in said housing, said tubing means including an inlet end adapted to be connected to a source of fluid to be pumped and an outlet end; c. an inlet plunger, an extruder plunger and an outlet plunger arranged serially in said housing in opposition to and along the length of said tubing means in said housing, said inlet, extruder, and outlet plungers being further arranged to be displaced and to thereby apply compressive forces to said tubing means; d. a linear actuator; e. primary cam means slidably mounted in said housing and responsive to said linear actuator for displacing said inlet and said outlet plungers in a predetermined timed relationship with respect to each other to thereby apply said forces to said tubing means, said primary cam means being comprised of first and second axially spaced apart sections; and f. secondary cam means located between said first and second sections responsive to the movement of said first cam means for displacing said extruder plunger in a predetermined time relationship with respect to the displacement of said inlet and outlet plungers, said secondary cam means being slidably mounted on said primary cam means and arranged to be displaced in one axial direction by a portion of one of said primary cam means sections and to be displaced in the opposite axial direction by the other of said primary cam means sections. - View Dependent Claims (2, 3, 4, 5)
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Specification