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Class Information
Number: 417/214
Name: Pumps > Condition responsive control of drive transmission or pump displacement > Having means to hold or resist movement of pumping element
Description: Apparatus in which the control means comprises a positive lock, friction brake, fluid retarder or similar device which will act to prevent or restrict movement of the pumping member by acting directly thereon or on a part directly connected thereto.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8550218 Remote control for braking system of progressive cavity pump Oct. 8, 2013
8529225 Electromagnetic reciprocating fluid device Sep. 10, 2013
8500700 Dosing unit, ambulatory infusion device comprising dosing unit and method for operating a dosing unit Aug. 6, 2013
8491278 Auxiliary braking device for wellhead having progressive cavity pump Jul. 23, 2013
8469930 Dosing unit, ambulatory infusion device comprising dosing unit and method for operating a dosing unit Jun. 25, 2013
8439656 Liquid pump for an internal combustion engine and device for heating liquid May. 14, 2013
8323245 Infusion device and method Dec. 4, 2012
8197238 Pump apparatus Jun. 12, 2012
7841838 Rotary closed type compressor and refrigerating cycle apparatus Nov. 30, 2010
7806665 Auxiliary braking device for wellhead having progressive cavity pump Oct. 5, 2010
7553132 Micro device incorporating programmable element Jun. 30, 2009
RE40400 Capacity modulated scroll machine Jun. 24, 2008
7090470 Apparatus and method for preventing a piston and valve collision in a linear compressor Aug. 15, 2006
6679684 Pump device having a device for restricting movement of a movable member movable to pressurize working fluid Jan. 20, 2004
6533562 Two-stage oil injection into scroll compressors Mar. 18, 2003
6524078 Pond pump with reversing means to prevent rotation in the opposite direction Feb. 25, 2003
6347571 Radial piston motor with friction brake Feb. 19, 2002
6341945 Scroll compressor with reduced capacity at high operating temperatures Jan. 29, 2002
6200106 Fan assembly with a fan locking device for an automotive fluid friction fan clutch Mar. 13, 2001
6113355 Pump drive head pump assembly with a hydraulic pump circuit for preventing back-spin when the drive head has been shut off Sep. 5, 2000
6074172 Controller for compressor Jun. 13, 2000
6016691 Calibrated toggle lever of leak detection module pump Jan. 25, 2000
5879136 Electrohydraulic adjustable pump Mar. 9, 1999
5741120 Capacity modulated scroll machine Apr. 21, 1998
5567122 Cylinder pump having controllable piston/drive detachment Oct. 22, 1996
5507266 Fuel pressure control using hysteresis pump drive Apr. 16, 1996
5503536 Rolling wheel actuated pump and pump system Apr. 2, 1996
5378112 Positive displacement, variable delivery pumping apparatus Jan. 3, 1995
5358036 Safety disc brake assembly Oct. 25, 1994
5320498 Structure for plunger pump Jun. 14, 1994
5284424 Osmotic water purification pumping system with flush valve Feb. 8, 1994
5219274 Pump with internal pressure relief Jun. 15, 1993
5201174 Auxiliary hydraulic pump system Apr. 13, 1993
5197418 Fuel injection pump for a two-stroke engine Mar. 30, 1993
5197417 Fuel injection pump for a two-stroke engine in a work apparatus such as a motor-driven chain saw Mar. 30, 1993
5090295 Radial piston engine Feb. 25, 1992
5061155 Rotary swash plate type axial plunger pump Oct. 29, 1991
5044891 Variable displacement diaphragm pump Sep. 3, 1991
5004403 Pressure responsive drivers for reciprocating pump and method Apr. 2, 1991
4954053 Free-piston compressor with gas spring control Sep. 4, 1990
4856966 Variable displacement diaphragm pump Aug. 15, 1989
4817688 Method and device for driving double bellows pump Apr. 4, 1989
4681514 Radial piston pump having sealing disc Jul. 21, 1987
4648803 Control circuit and control valve for radial piston pump Mar. 10, 1987
4636147 Lubricating-oil pump for a motor-driven apparatus Jan. 13, 1987
4619592 Pumping system having a main pump and a plurality of selectively operable subsidiary pumps Oct. 28, 1986
4613285 Piston stroke control device for free piston type oscillating compressors Sep. 23, 1986
4527463 Dosing pump for liquids Jul. 9, 1985
4515530 Disabling arrangement for a reciprocating piston compressor May. 7, 1985
4500262 Variable pressure and displacement reciprocating pump Feb. 19, 1985

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