Pumps – Motor driven – Electric or magnetic motor
Patent
1994-02-28
1996-01-16
Bertsch, Richard A.
Pumps
Motor driven
Electric or magnetic motor
417534, 417551, 12820513, 12820516, F04B 3504, A61M 1600
Patent
active
054842700
ABSTRACT:
A reciprocating pump particularly useful in ventilator apparatus includes a piston reciprocatable axially within a cylinder and dividing its interior into an inlet chamber and an outlet chamber, a wall fixed within the inlet chamber, and a drive housing fixed to the wall. The drive housing includes a motor, a rotor rotatable by the motor, a nut rotatable within the drive housing, and a screw threadedly coupled at one end to the nut and fixed at its opposite end to the piston. The piston is substantially unrestrained for axial and rotary movement such that forward and reverse rotation of the nut by the motor reciprocates the screw and the piston axially of the cylinder, and also permits the screw and the piston to rotate with respect to the cylinder to thereby even out wear between the piston and cylinder.
REFERENCES:
patent: 1713219 (1929-05-01), Eisenhauer
patent: 3918447 (1975-11-01), Inkster et al.
patent: 3932066 (1976-01-01), Eyrick et al.
patent: 4145165 (1979-03-01), Perkins et al.
patent: 4276003 (1981-06-01), Perkins et al.
patent: 4493614 (1985-01-01), Chu et al.
patent: 4807616 (1989-02-01), Adahan
patent: 4823787 (1989-04-01), Adahan
patent: 4836198 (1989-06-01), Gates
patent: 4941469 (1990-07-01), Adahan
Bertsch Richard A.
Wicker William
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