US Patent No: 4,276,003

Number of patents in Portfolio can not be more than 2000

Reciprocating piston pump system with screw drive

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Abstract

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A pump system of the reciprocating piston type is described, which facilitates direct motor drive and cylinder sealing. A threaded middle potion of the piston is engaged by a nut connected to rotate with the rotor of an electric motor, in a manner that minimizes loading on the rotor by the use of a coupling that transmits torque to the nut but permits it to shift axially and radially with respect to the rotor. The nut has a threaded hydrostatic bearing for engaging the threaded piston portion, with an oil-carrying groove in the nut being interrupted. A fluid emitting seal located at the entrance to each cylinder, can serve to center the piston within the cylinder, wash the piston, and to aid in sealing. The piston can have a long stroke to diameter ratio to minimize reciprocations and wear on valves at high pressures. The voltage applied to the motor can be reversed prior to the piston reaching the end of its stroke, to permit pressure on the piston to aid in reversing the motor.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CALIFORNIA INSTITUTE OF TECHNOLOGYPASADENA, CA2651

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Moore, Nicholas R Altadena, CA 1 32
Perkins, Gerald S Altadena, CA 6 137

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Patent Info (Count) # Cites Year
 
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4,741,250 Fluid-power device using rollers 15 1986
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4,838,103 Fluid-power device with rollers 6 1987
4,881,419 Fluid-power bearing actuator 11 1987
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5,027,667 Spring actuator with rollers 5 1989
 
UNICO, INC. (4)
8,152,492 Linear rod pump apparatus and method 0 2007
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FLIGHT MEDICAL, LTD. (3)
5,484,270 Pump particularly useful in respirator apparatus and exhalation valve assembly therefor 14 1994
5,683,232 Pump particularly useful in respirator apparatus and exhalation valve assembly thereof 20 1995
6,073,630 Exhalation valve assembly 16 1997
 
744353 ALBERTA LTD. (2)
6,199,884 Helical drive bicycle 2 1996
6,213,487 Helical drive wheelchair 3 1997
 
EXLAR CORPORATION (2)
5,491,372 Electric linear actuator with planetary action 43 1993
5,557,154 Linear actuator with feedback position sensor device 58 1993
 
RESPIRONICS, INC. (2)
4,493,614 Pump for a portable ventilator 114 1983
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CAMERON INTERNATIONAL CORPORATION (1)
7,934,376 Hydraulic actuation assembly 0 2006
 
DRESSER, INC. (1)
8,425,209 Vapor recovery pump 0 2006
 
Helixsphere Technologies, Inc. (1)
6,241,565 Helical drive human powered boat 0 1997
 
ITT MANUFACTURING ENTERPRISES, INC. (1)
6,315,370 Electronically controllable brake operating system 11 1998
 
KARASAWA FINE, LTD. (1)
6,139,288 High pressure pump 2 1998
 
NIDEC SANKYO CORPORATION (1)
7,537,437 Linear actuator, and valve device and pump device using the same 1 2005
 
Petrophysical Services, Inc. (1)
4,509,904 Metering pump 12 1983
 
SANKYO SEIKI MFG. CO., LTD. (1)
6,781,797 Lubricated thread screw drive and method of manufacturing same 0 2002
 
SIEMENS HEALTHCARE DIAGNOSTICS INC. (1)
6,234,771 Precision pumping device 0 1999
 
SMC KABUSHIKI KAISHA (1)
6,327,924 Actuator for converting rotary motion into rectilinear motion 7 1998
 
Other [Check patent profile for assignment information] (2)
4,945,845 High-speed sailing craft 3 1989
8,167,591 High pressure air pump with reciprocating drive 0 2010