US 4,726,745 AGranted

Portable fluid pumping device

OwnerCarmeli Adahaninventor

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Abstract

A portable fluid pumping device, comprises a piston carried within a compartment by a rolling diaphragm and defining, on one side thereof, an expansible-contractible pumping chamber communicating with the inlet and outlet ports; a drive for the piston including an electric rotary motor and an eccentric bearing coupling the motor to the piston to reciprocate the piston upon the rotation of the motor; a flywheel coupled to the motor; and valves permitting fluid to enter the pumping chamber from the inlet port during the forward strokes of the piston, and to exit from the pumping chamber via the outlet port during the return strokes of the piston. The strokes of the piston are limited such that the volume of the pumping chamber in the contracted condition is more than 1/5 its volume in the expanded condition. In addition, the piston, drive, flywheel and valves are all arranged in a single assembly, the housing being partitioned to permit the quick introduction and removal of the single assembly for repair or maintenance purposes.

Claims19

Dependent claims

A portable fluid pumping device, comprising:

a housing having an internal compartment, a fluid inlet port, and a fluid outlet port;
a piston carried within said compartment by a rolling diaphragm and defining, on one side thereof, an expansible-contractible pumping chamber communicating with said inlet and outlet ports;
a drive for said piston including an electric rotary motor, an eccentric bearing rotated by the motor, and a piston rod coupling the eccentric bearing to the piston to reciprocate the piston upon the rotation of the motor;
a flywheel coupled to said rotary motor;
valve means permitting fluid to enter said pumping chamber from said inlet port during the forward strokes of said piston, and to exit from the pumping chamber via said outlet port during the return strokes of said piston;
a partition in said housing and formed with a slot extending from one edge thereof;
and means securing together said piston, piston rod, rolling diaphragm, flywheel, eccentric bearing and valve means such that they are all insertable and removable as a unitary assembly, with the valve means, piston and rolling diaphragm received on one side of the partition, said flywheel and eccentric bearing received on the other side of the partition, and said piston rod passing through said slot in the partition so that the slot accommodates the piston rod during its reciprocations.

4 more elements

A portable fluid pumping device, comprising:

a housing having an internal compartment, a fluid inlet port, and a fluid outlet port;
a piston carried within said compartment by a rolling diaphragm and defining, on one side thereof, an expansible-contractible pumping chamber communicating with said inlet and outlet ports;
a drive for said piston including an electric rotary motor, an eccentric bearing rotated by the motor, and a piston rod coupling the eccentric bearing to the piston to reciprocate the piston upon the rotation of the motor;
a flywheel coupled to said rotary motor;
valve means permitting fluid to enter said pumping chamber from said inlet port during the forward strokes of said piston, and to exit from the pumping chamber via said outlet port during the return strokes of said piston;
and means limiting the strokes of said piston such that the volume of the pumping chamber in the contracted condition is more than 1/5 its volume in the expanded condition.

3 more elements

Dependencies are inferred from the claim text.