With Flexible Or Resiliently Biased Non-working Member Movable Wall In Constant Communication With Working Chamber Patents (Class 92/60)
  • Publication number: 20140157979
    Abstract: A pneumatic pressure brake booster system includes an air pressure chamber; an ambient air chamber; a flexible diaphragm separating the air pressure chamber and the ambient air chamber; at least one air pressure source communicating with the air pressure chamber; a brake pedal shaft engaged by and movable with the diaphragm; and a brake master cylinder engaged by the brake pedal shaft.
    Type: Application
    Filed: December 8, 2012
    Publication date: June 12, 2014
    Applicant: Ford Global Technologies, LLC
    Inventors: Mark Warren Muddiman, Dale Scott Crombez
  • Patent number: 8734139
    Abstract: A fluid pump having a pump housing that includes at least one expansion joint, provides volume compensation, as needed, to adjust for changes in pressure in the pump housing. Various embodiments automatically and passively reduce static pressure in the pump housing associated with a freezing event, thereby preventing damage to the pump head. Volume compensation is achieved by employing, in each expansion joint, a dynamic seal that allows relative movement of two portions of the pump housing, and a bias that provides a selected counter-force to the movement of the housing portions. The subject pumps are particularly suited for use in automotive and other rugged applications, in which fluid pumps may experience recurring freezing events.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: May 27, 2014
    Assignee: Micropump, Inc.
    Inventors: Stephen Michael Burns, Charles F. Carr, David J. Grimes
  • Publication number: 20110113889
    Abstract: A pressure transfer device comprises a pressure transfer device body and an isolating diaphragm, wherein, between the surface of the body of the pressure transmitting device and the isolating diaphragm, a pressure chamber is formed, whose volume is dependent on the position of the isolating diaphragm. The isolating diaphragm has a material thickness and a deflectable working region with an area A, wherein the isolating diaphragm has a reference position, in which the pressure chamber contains a reference volume Vref, and the isolating diaphragm is deflectable from the reference position at least so far in two directions, that the volume of the pressure chamber varies between values of up to Vref+/??Vdesired, wherein associated with a volume change ?V is a dimensionless deflection measure w, with w(?V):=(3·?V)/(A·h), wherein ?Vdesired is dimensioned in such a way, that |w(?Vdesired)|?2.5; wherein, in the case of all w(?V), for which |w(?V)|?|w?(?V)|, wherein |w?(?V)|?0.
    Type: Application
    Filed: June 23, 2009
    Publication date: May 19, 2011
    Inventors: Dieter Funken, Igor Getman
  • Publication number: 20090056532
    Abstract: A pneumatic brake booster with a booster housing is subdivided into at least one working chamber and at least one vacuum chamber by means of at least one axially movable wall capable of being acted upon with a pneumatic differential pressure. An actuable input member includes a valve piston, with an output member for acting upon a brake master cylinder with an output force. A control valve is arranged in a control housing and can be actuated by the valve piston for controlling the differential pressure. An elastic reaction element is arranged in a control housing recess and against which the output member bears. Means for setting a distance z between the valve piston and the reaction element are provided on the output member.
    Type: Application
    Filed: February 12, 2007
    Publication date: March 5, 2009
    Applicant: Continental Teves AG & Co., oHG
    Inventors: Klaus Lind, Jurgen Faller
  • Patent number: 7404382
    Abstract: A kind of variable engine valve control system with pressure difference comprises hydraulic supply equipment, hydraulic actuator apparatus, valve and spring controlling piston balance. The hydraulic actuator comprises hydraulic cylinder, piston and piston rod. The piston rod is coupled and moved with the valve. It is characterized by that the said piston divides the hydraulic cylinder into upper chamber and lower chamber. The said hydraulic supply equipment is connected with the upper chamber of the hydraulic cylinder through the fluid inlet pipe and the said lower chamber of the hydraulic cylinder is connected with the hydraulic supply equipment through the pressure difference proportional relief valve.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: July 29, 2008
    Assignee: Ningbo Hoyea Machinery Manufacture Co., Ltd.
    Inventors: Junjie Ling, Zhentao Weng
  • Patent number: 7121089
    Abstract: In a hydraulic cylinder having a shock absorbing function, and capable of stopping as desired by an accumulator disposed within a cylinder rod. The accumulator includes an accumulator piston that divides the cylinder rod interior into first and second cylinder rod chambers, gas hermetically charged into the second cylinder rod chamber, and an accumulation port that is communicated with the first cylinder rod chamber and flows the operating oil from outside into the first cylinder rod chamber.
    Type: Grant
    Filed: October 26, 2004
    Date of Patent: October 17, 2006
    Assignees: Komatsu Ltd., Komatsu Zenoah Co.
    Inventors: Masahiro Tosen, Tatsuya Futami, Kenji Kanemaru, Yoshiaki Yamamoto
  • Patent number: 7063200
    Abstract: A pulsation dampening apparatus and a clutch master cylinder used for a hydraulic clutch operation system which has a hydraulic circuit. The apparatus has a housing which has a dampening chamber in the hydraulic circuit and a dampening assembly accommodated in the housing. The dampening assembly includes a working unit which dampens pulsations generated in the dampening chamber in the hydraulic circuit, an elastic retainer preloaded between the housing and the working unit to fasten the working unit into the housing by exerting a reaction force onto the working unit, and a force conversion mechanism which increases the reaction force of the elastic retainer in accordance with an urging force transmitted from the working unit to the elastic retainer.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: June 20, 2006
    Assignee: Nabco, Ltd.
    Inventor: Koji Takahashi
  • Patent number: 6595105
    Abstract: Reciprocating compressor including a connecting rod for converting a rotating movement of a crank shaft into a linear reciprocating movement, a piston for making a linear reciprocating movement inside of a cylinder block by the connecting rod, and resonating means for resonating the piston, wherein the resonating means is a supplementary piston fitted to the piston additionally and a resonator fitted between the supplementary piston and the piston, or a resonator in a space between a sleeve side part and a piston side part of a divided connecting rod, thereby preventing an over pressure loss of the refrigerant and enhancing a performance by increasing refrigerant flow rate.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: July 22, 2003
    Assignee: LG Electronics Inc.
    Inventors: Kwang Hyup An, Hwan Joo Myung, In Seop Lee
  • Patent number: 6584885
    Abstract: An actuator comprises a cylinder, a first, second and third port, an actuation piston, a control piston and a control spring. The cylinder defines a longitudinal axis and comprises a first and second end. The first port communicates with the first end of the cylinder, the second port communicates with the second end of the cylinder, and the third port communicates with the cylinder between the first and second ends. The actuation piston is disposed in the cylinder and is moveable along the longitudinal axis in a first and second direction. The actuation piston comprises a first and second side. The control piston also is disposed in the cylinder and is moveable along the longitudinal axis in a first and second direction. The control piston comprises a first and second side, with the first side of the control piston facing the second side of the actuation piston. The control spring biases the control piston in at least one of the first and second directions.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: July 1, 2003
    Assignee: Visteon Global Technologies, Inc.
    Inventor: Zheng Lou
  • Publication number: 20020043153
    Abstract: Reciprocating compressor including a connecting rod for converting a rotating movement of a crank shaft into a linear reciprocating movement, a piston for making a linear reciprocating movement inside of a cylinder block by the connecting rod, and resonating means for resonating the piston, wherein the resonating means is a supplementary piston fitted to the piston additionally and a resonator fitted between the supplementary piston and the piston, or a resonator in a space between a sleeve side part and a piston side part of a divided connecting rod, thereby preventing an over pressure loss of the refrigerant and enhancing a performance by increasing refrigerant flow rate.
    Type: Application
    Filed: March 27, 2001
    Publication date: April 18, 2002
    Inventors: Kwang Hyup An, Hwan Joo Myung, In Seop Lee
  • Patent number: 5878578
    Abstract: A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) which defines a variable volume compensation chamber (23). The compensation chamber encloses a deformable member (5) which is adapted to exert an elastic force between the auxiliary piston (22) and a closed end (210) of cylinder (21). The compensation chamber (23) communicates with the pressure chamber (12) through a restriction (221) formed in a longitudinal duct (222) of the auxiliary piston (22). A sealing member (4) borne by a portion (222) of the auxiliary piston (22) closes the pressure chamber (12) such that the elastomeric member (5) dampens pressure differences between the pressure chamber (12) and compensation chamber (23).
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: March 9, 1999
    Assignee: Robert Bosch Sistemi Frenanti Spa
    Inventor: Leonardo Cadeddu
  • Patent number: 5816046
    Abstract: A method of suppressing vibrations of an actuation element of a hydraulic force transmission apparatus, especially a hydraulic clutch actuation system in an automobile, and an auxiliary vibrator for carrying out the method, are disclosed. The force transmission apparatus possesses a transmitter cylinder connected to the actuation element, and also a receiver cylinder connected to that cylinder by a liquid column, by which receiver cylinder a low-frequency excitation vibration is transmitted to the liquid column, which propagates in the latter as a low-frequency pressure pulsation.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: October 6, 1998
    Assignee: Fahrzeugtechnik Ebern GmbH
    Inventors: Karsten Paeth, Helmut Rugheimer
  • Patent number: 5410947
    Abstract: A fluid-powered actuator (42) has a body (11) which includes an end wall (16) provided with a through-opening (21). A piston rod (44) has an inner portion (44A) arranged on one side of the end wall within a pressurizable working chamber (24) of the actuator, has a penetrant portion (44B) passing through the end wall opening, and has an outer portion (44C) arranged on the other side of the end wall. The rod is configured such that the transverse cross-sectional area of the penetrant portion is greater than the transverse cross-sectional area of the outer portion so as to define an annular surface (46) which faces away from the actuator chamber. The improvement provides a seal assembly (43) for containing fluid leaking from the actuator chamber.
    Type: Grant
    Filed: September 17, 1993
    Date of Patent: May 2, 1995
    Assignee: Moog Inc.
    Inventor: Kenneth D. Garnjost
  • Patent number: 5249935
    Abstract: A piston pump is described which adapts the output flow to the supply flow which is intended in particular for use in a hydraulic brake slip control apparatus, the pump having a pump housing (2) with working chambers (9, 10) which are connectible to supply lines via an inlet valve (5) and an outlet valve (6). Working pistons (15) defining in part the working chambers are cyclically movable to increase and decrease the volume of the working chambers (9, 10) and are guided in cylinder bores (11, 12) and driven by a an eccentric (14) in order to perform stroke movements. The cylinder bores (11, 12) also receive charging pistons (18) which also define in part the working chambers (9, 10) and which are movable to decrease the volume of the working chambers (9, 10) by way of compression springs (20) supported on the pump housing (2) and which, via a pin (21), can be pressed against the working pistons (15).
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: October 5, 1993
    Assignee: Alfred Teves GmbH
    Inventor: Jochen Burgdorf
  • Patent number: 5081909
    Abstract: An actuator comprising a housing having a chamber and a piston slidably received within the chamber. The housing is provided with an inlet port to the chamber for the introduction of an operating fluid to cause the piston to slide within the chamber. The housing is provided with means for releasably attaching the actuator relative to a stem to be actuated. Additionally, the housing includes a plug for sealing an aperture to the chamber and receiving the stem. The plug moves into the chamber to enable the piston to act upon the stem via the plug.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: January 21, 1992
    Assignee: National Oilwell (U.K.) Ltd.
    Inventor: R. Hart
  • Patent number: 5016521
    Abstract: The present invention is directed to a self-adjusting servo mechanism (10). That is, the servo pin (30) presented from the servo mechanism (10) will protract sufficiently to effect operative engagement of a friction band assembly (13) with a rotating member (18) in a planetary gear set--even though the required axial displacement of the servo pin (30) during such protraction may exceed the axial displacement available to the actuating piston (33). The servo mechanism (10) is incorporated in a housing (20). The housing (20) presents a socket cavity (24) within which an actuating piston (33) is received for axial displacement through a predetermined distance. The servo pin (30) is supported by the housing (20) for axial reciprocation, and a coupling means (35) is interposed between the servo pin (30) and the actuating piston (33) operatively to protract the servo pin (30) in response to displacement of the actuating piston (33).
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: May 21, 1991
    Assignee: General Motors Corporation
    Inventor: Raymond J. Haka
  • Patent number: 4947732
    Abstract: An electro-hydraulic servo actuator with function for adjusting rigidity. The electro-hydraulic servo actuator comprises an electro-hydraulic transducer which transduces an electric signal into a hydraulic signal, an actuator of a cylinder type which is operated by the electro-hydraulic transducer, and a position detector which detects a position of an output member of the actuator to emit a positional electric signal. The hydraulic-element transducer is a bias piston which is disposed within a actuator rod of the cylinder type actuator and which floats in response to a differential pressure within the cylinder, and the piston is connected to the position detector.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: August 14, 1990
    Assignee: Teijin Seike Co., Ltd.
    Inventor: Ako Hidenobu
  • Patent number: 4858439
    Abstract: A stroke variable device comprising a large diameter cylinder and a small diameter cylinder which are interconnected to each other. A large diameter piston and a small diameter piston are slidably inserted into the large diameter cylinder and the small diameter cylinder, respectively, and a cylinder chamber is formed between the inner end of the large diameter piston and the inner end of the small diameter piston. A first seal member is arranged to surround the projecting outer end of the large diameter piston, and a second seal member is arranged to surround the projecting outer end of the small diameter piston. One end of the first seal member is fixed to the projecting outer end of the large diameter piston, and the other end thereof is fixed to the housing of the device to form a first hermetically sealed chamber therein.
    Type: Grant
    Filed: February 17, 1988
    Date of Patent: August 22, 1989
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Daisaku Sawada, Takeshi Takahashi
  • Patent number: 4841846
    Abstract: Apparatus and method for maintaining viscous liquid sealing substances such a grease adjacent and in contact with seals utilized in pneumatic cylinder-and-piston actuators for oil and gas well swabs, the structure including a piston member which is slideable on the piston rod and which includes an external O-ring for sealing engagement between the cylinders and the piston member and an internal O-ring which is in sealing engagement between the piston member and the piston rod. The piston member is resiliently urged by a compression spring towards the actuating piston and the viscous liquid is trapped between the actuating piston and the slideable piston member. A further like slideable piston member may also disposed on an extension of the piston rod on the opposite side of the actuating piston which is also urged towards the actuating piston. Viscous liquid is trapped between the latter slideable piston member and the actuating piston.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: June 27, 1989
    Inventor: William D. Grambling
  • Patent number: 4809733
    Abstract: A fail-safe gate valve assembly having a power actuator and a spring actuator disposed on opposite sides of a flowline. The assembly includes a valve body, a valve chamber including a gate movable between open and closed positions for controlling fluids through the flowline, a first housing containing the power actuator disposed on one side of the valve body and a second housing containing the spring actuator disposed on the opposite side of the valve body. The power actuator urges the gate from one to another of the positions. The spring actuator urges the gate from the other to the one of the positions in event a power loss occurs to the power actuator. The spring actuator may include an override thereby allowing the override to be used to open and close the gate valve without compressing the springs.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: March 7, 1989
    Assignee: National-Oilwell
    Inventor: Herman H. Hawkins
  • Patent number: 4601233
    Abstract: A hydraulic servo device with a built-in accumulator, comprising a servo piston fit in a servo cylinder and connected via a stem to a band brake, an accumulator piston having a large diameter outer diameter portion and a small diameter outer diameter portion fit in the servo cylinder at two inner diameter portions thereof having different diameters and an inner diameter portion fit around a small diameter outer diameter portion of the servo piston, and an accumulator piston spring biasing the accumulator piston toward the servo piston.
    Type: Grant
    Filed: October 5, 1984
    Date of Patent: July 22, 1986
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Kazuhiko Sugano
  • Patent number: 4597322
    Abstract: A seal assembly is arranged to contain leakage of hydraulic fluid passing between a wall opening and a penetrant rod portion passing through the opening. The seal assembly includes a sliding-seal member mounted on a portion of the rod for sliding movement toward and away from an abutment surface and a non-sliding flexible-seal member arranged between the body and the sliding-seal member. The body, flexible-seal member, sliding-seal member and rod define a sealed chamber into which such fluid will leak. The chamber communicates with a fluid reservoir through a oneway check valve. The sliding-seal and flexible-seal members are arranged in parallel with one another. In one embodiment, a spring urges the sliding-seal member to move toward an abutment surface provided on the rod. In another embodiment, movement of the sliding-seal member relative to the body is limited by facing abutment steps.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: July 1, 1986
    Assignee: Moog Inc.
    Inventors: Kenneth D. Garnjost, David J. Flavell
  • Patent number: 4534711
    Abstract: An ultrahigh pressure water apparatus converts feed water of normal pressure into ultrahigh pressure water by means of an ultrahigh pressure pump and projects the ultrahigh pressure water through a nozzle gun in the form of jets of ultrahigh pressure water. The nozzle gun has an eccentric shaft tube rotatably disposed inside a nozzle cover, a high pressure hose rotatably inserted into the eccentric shaft tube, and nozzles fastened to the leading end of the high pressure hose. Owing to the rotation of the eccentric shaft tube, the jets of ultrahigh pressure water projected through the nozzle are sympathetically rotated.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: August 13, 1985
    Assignee: Wakatsuki Kikai Kabushiki Kaisha
    Inventor: Masakatsu Wakatsuki
  • Patent number: 4496033
    Abstract: A pair of axially aligned and nested pistons are mounted in a pressure sealed arrangement within the bore of a pressure housing. A primary piston is moved in response to increasing pressure to provide an actuating output force while a secondary piston simultaneously moves to overcome a reverse bias on it by a tension spring and adds to the actuating force by engaging the primary piston only when the pressure exceeds a specific higher threshold. The primary and secondary pistons thereafter operate in conjunction under the influence of high pressure to provide the output actuating force.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: January 29, 1985
    Assignee: Goodyear Aerospace Corporation
    Inventors: John M. Hall, Milan Pantic
  • Patent number: 4389984
    Abstract: The impeller bearings in a turbocharger on an internal combustion engine are supplied with a coolant, in the form of lubricating oil from the engine's crankcase, during post-shutdown coasting of the impeller. This coolant is supplied by an accumulator including a piston having an upstream side which is subjected to oil under pressure from the crankcase during engine operation to move the piston downstream for loading a spring affixed to the downstream side of the piston. Coolant leaking downstream of the piston is returned to the crankcase through a valve seat which is closed during engine operation by a valve extending from the downstream side of the piston.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: June 28, 1983
    Inventor: Terry G. Destrampe
  • Patent number: 4359976
    Abstract: A compression compensator for an internal combustion engine comprising a flexible disc of high heat resistant spring material is secured to the top of each of the engine pistons. In addition, a spiral spring may be placed between the disc and the piston top to increase the flexibility and resilience of the compensator.
    Type: Grant
    Filed: June 17, 1980
    Date of Patent: November 23, 1982
    Inventor: Harry C. Steele
  • Patent number: 4301908
    Abstract: An antivibration device for a clutch pedal in a clutch operating mechanism wherein upon depressing the clutch pedal a hydraulic pressure is caused in a master cylinder, which in turn actuates an operating cylinder to operate a withdrawal lever, the device having an oil damper provided in a hydraulic passage communicating between the master and operating cylinders, thereby absorbing fluctuations in hydraulic pressure in the operating cylinder caused by engine vibrations to prevent vibration of the clutch pedal.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: November 24, 1981
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Syozi Fukuda, Teruo Munakata, Masashi Matsuki
  • Patent number: 4205638
    Abstract: A double acting Diesel cycle hot gas engine comprising a plurality of engine cylinders, each having a free piston unit adapted to perform work, providing a continuous flow of compressed air to an energy consumption source and to a storage tank connected therewith. The free piston unit includes an air compression piston and a power piston, spaced apart from each other and adapted to move together within each respective engine cylinder through a connecting rod extended therebetween in response to the movement of a working medium under a substantially constant pressure acting against one side of the power piston and to the pressure and expansive power generated by the burning gases of an air fuel mixture acting on the opposite side of said power piston. Cycle control means are provided to release the potential energy accumulated within the working medium which is initially used to drive the power piston to compress the air fuel mixture and thus, initiating the operative cycle of the engine.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: June 3, 1980
    Inventor: Giovanni Vlacancinch
  • Patent number: 4012173
    Abstract: A variable stroke compressor is disclosed that includes a casing with an upper and lower piston, the lower piston being connected to a piston rod and the upper piston being slidably received for reciprocal movement on the piston rod. Means are provided on the upper piston to control its descent towards the lower piston.
    Type: Grant
    Filed: January 26, 1976
    Date of Patent: March 15, 1977
    Inventor: Kirke B. Everson, Jr.
  • Patent number: 4007667
    Abstract: Apparatus having an operating cylinder and piston rod combined with a shock-absorbing cylinder and piston. The two hydraulic devices are connected by a conduit which allows the piston rod of the operating cylinder to yield under shock loads which are absorbed by the second cylinder and piston and immediately return to an original adjusted position when any imposed load returns to normal.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: February 15, 1977
    Assignee: Fauchon Engineering Works Limited
    Inventors: Jacob K. Elias, Victor G. Eriksen
  • Patent number: 3995535
    Abstract: An expansible chamber device in which a cylinder of preferably rectangular configuration supports a pair of opposing flaps pivotally attached to the corners of the cylinder. The flaps sealably and slidably engage the top surface of a piston disposed within the cylinder such that the surface area of the flaps together with the exposed surface area of the top surface of the piston between the flaps constitutes the effective working area of the device. This area is considerably greater than the area of the piston surface itself whereby overall efficiency of the chamber is increased.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: December 7, 1976
    Inventor: Russell Ozechowski
  • Patent number: 3995534
    Abstract: A safety arrester for arresting a hydraulically operated lifting ram of a hydraulic elevator comprises an arrester body within which a plurality of brake shoes are located. The brake shoes are segments of a ring around a passage through the arrester body for receiving the ram, are spring biassed into frictional engagement with the ram, and are displaceable out of engagement with the ram by hydraulic actuator means.
    Type: Grant
    Filed: June 27, 1974
    Date of Patent: December 7, 1976
    Inventor: Adolf Rastetter
  • Patent number: 3986437
    Abstract: A double-acting rotary hydraulic jack having two jack compartments, comprising a rotary hydraulic joint for the supply of hydraulic liquid to and the evacuation of hydraulic liquid from the compartments. The two compartments of the jack each communicate with at least one axial boring in a rotary part of the jack which is not axially movable. In this boring a movable piston bears against the head of a guide rod for a spring which itself bears against the rotary part of the jack. The ends of the rods, externally of the borings, are secured to a member coaxial with the jack, for example a sleeve, whose axial position is monitored by a displacement detector, so as to give an indication of the working pressure in the active jack compartment.
    Type: Grant
    Filed: April 15, 1974
    Date of Patent: October 19, 1976
    Assignee: La Precision Industrielle
    Inventor: Jean Lioux
  • Patent number: 3985063
    Abstract: An accumulator structure for use in a hydraulic control system for controlling an hydraulic motor utilized to engage a friction device in a transmission including an accumulator piston mounted in a housing, a source of fluid pressure, a valve connected between the source and the motor. A first conduit connects the valve and motor, the first conduit including a fluid restriction, and a second conduit connects the valve and the accumulator. A third conduit is provided between the accumulator and the first conduit. The accumulator includes a counter-bored portion defining together with a reduced land portion on said piston, a passage which connects the second conduit to the third conduit when the piston is in the inactive position to provide a rapid fluid fill of the motor initially.
    Type: Grant
    Filed: August 30, 1974
    Date of Patent: October 12, 1976
    Assignee: Borg-Warner Corporation
    Inventor: Robert W. Lemon
  • Patent number: 3955371
    Abstract: A master cylinder having a secondary piston for absorbing rapid initial pressure increases in proportion to the stroke of the primary piston. The master cylinder includes a housing having a first cylinder formed therein. A first piston is movable within the first cylinder. A second cylinder is formed in the first piston. A second piston is movable within the second cylinder.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: May 11, 1976
    Assignee: Wagner Electric Corporation
    Inventor: Richard C. Bueler