Patents Examined by George Kapsalas
  • Reservoir-formed shoulder stop for makeup fluid valve actuation in pull-type master cylinder
    Patent number: 4893473
    Abstract: A fabricated master cylinder having a reservoir part and in interlocked cylinder part defining a cylinder bore and which a slidable piston is supported. The reservoir part that extends into the cylinder bore defines a shoulder that cooperates with a recuperation valve for forming an actuating stop for holding the makeup fluid recuperation valve in an opened position when the piston is at its at rest position.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: January 16, 1990
    Assignee: Lucas Industries Public Limited Company
    Inventors: Patrick H. Hool, Glenn R. Gualdoni
  • Boost-failure responsive fluid tapping valve in tandem master cylinder with booster piston at pedal-remote end of master cylinder
    Patent number: 4891945
    Abstract: The brake pressure generator (1) includes a tandem master cylinder (2) actuable by two booster pistons (19, 32) to which a hydraulic auxiliary pressure is applied and by a pedal actuating mechanism (17,18). A control valve (14, 20) controls the auxiliary boost pressure. The control valve, through an actuator (16), cooperates with the pedal actuating mechanism (17,18). One booster piston (32) is disposed on the bottom of the tandem master cylinder (2) adjacent the push rod (22). Normally-open valve (37) closes when brake pressure exceeds boost pressure to trap fluid in chamber (34).
    Type: Grant
    Filed: August 5, 1987
    Date of Patent: January 9, 1990
    Assignee: Alfred Teves GmbH
    Inventor: Horst-Peter Becker
  • Fluid operated circuit for controlling a dual post hydraulic lift assembly
    Patent number: 4892028
    Abstract: A fluid operated circuit for controlling the movement of pistons contained in the drive and idler cylinders of a conventional dual post vehicle lift assembly of the type wherein the cylinders are hydraulically connected in tandem so that movement of the idler cylinder piston is dependent upon movement of the drive cylinder piston and wherein the pistons, while operative to lift and lower movable article supporting structures, are not fixedly connected thereto.
    Type: Grant
    Filed: September 10, 1984
    Date of Patent: January 9, 1990
    Assignee: VBM Corporation
    Inventor: Bernard R. Stivers
  • Magnetically actuated valve for cyclically operating piston-cylinder actuator
    Patent number: 4889035
    Abstract: A fluid pressure oscillator is provided with a cylinder containing a piston assembly. Fluid actuated reciprocation of the piston assembly is controlled by a valve mounted externally of the cylinder. The valve is alternately shifted between "advance" and "retract" settings by a reciprocating actuating rod removably received in the cylinder. A magnet on the piston assembly cooperates with magnetic elements on the actuating rod to automatically reciprocate the latter.
    Type: Grant
    Filed: July 16, 1985
    Date of Patent: December 26, 1989
    Assignee: Thermo Electron Web Systems, Inc.
    Inventor: Ronald F. Goodnow
  • Internal combustion engine piston with threaded ceramic piston head
    Patent number: 4887518
    Abstract: A piston has a piston head made of ceramics, and includes a ceramic piston head having a male rounded thread portion at the outer periphery thereof, a metal piston body having a depression in the top portion for receiving the piston head, and a female rounded thread at the inner periphery of the depression for mating with the male thread portion. A rotation restraint member is provided between the male thread portion and the female thread portion for restraining the piston head from turning with respect to the piston body. The ratio of the height of the thread to the pitch preferably is from 1/4 to 1/2.
    Type: Grant
    Filed: May 2, 1988
    Date of Patent: December 19, 1989
    Assignee: NGK Insulators, Ltd.
    Inventor: Isse Hayakawa
  • Auxiliary coupler pressure relief hydraulic system with pump drive ignition switch relief
    Patent number: 4881371
    Abstract: An auxiliary coupler pressure relief hydraulic system for off-road vehicles including a battery, an engine, an engine ignition system, a reservoir of hydraulic fluid, and a pump for providing hydraulic fluid under pressure. Quick couplers couple hydraulic fluid to an attachment mounted to the vehicle. An electro-hydraulic spool valve is connected to a source of pilot pressure and controls the flow of hydraulic fluid to the quick couplers in response to valve actuating signals. Forward and reverse auxiliary control switches are coupled to the spool valve and provide valve actuating signals resulting in fluid flow to the quick couplers in forward and reverse directions. Also included is an ignition switch having RUN, OFF and RELIEF positions.
    Type: Grant
    Filed: July 26, 1988
    Date of Patent: November 21, 1989
    Assignee: Clark Equipment Company
    Inventors: Thomas Q. Haeder, William C. Shelbourn
  • Tab-aligned replaceable cartridge for master cylinder
    Patent number: 4878346
    Abstract: A replaceable cartridge assembly for master cylinder having a housing with a longitudinal bore and an oil inlet connected to the longitudinal bore. The assembly includes a cylinder removably mounted in the longitudinal bore, a pair of seal rings mounted on the cylinder and located on each side of the oil inlet, an axial bore in the cylinder having a fluid outlet at one end connected to the brake system, and a pair of ports connecting the space between the seal rings to the axial bore in the cylinder. A piston in the cylinder has a cup seal around the outside and an O-ring seal spaced from the cup seal. A collar in the end of the axial bore in the cylinder retains the piston in the bore while a spring in the axial bore in the cylinder biases the piston away from the end of the cylinder.
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: November 7, 1989
    Assignee: Hayes Industrial Brake, Inc.
    Inventors: Glenn S. Metzelfeld, James A. V. Buckely, Donald D. Brown
  • Tandem master cylinder with booster piston at pedal-remote end of master cylinder and with booster-pressure responsive reservoir valve for forward brake circuit
    Patent number: 4876853
    Abstract: A tandem master cylinder with a booster used for a hydraulic actuator such as an automotive brake system. The master cylinder has a first and a second independently movable presser piston disposed in tandem in a first housing such that the presser pistons and the first housing define a first and a second pressure chamber. The booster has a first power piston advanced by a fluid pressure in a first power chamber formed in a second housing, to advance the first presser piston. The booster has a valve operable due to a relative movement between the first power piston, and an operating member for operating said booster, whereby the fluid pressure in the first power chamber is controlled according to an operating force applied to the operating member.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: October 31, 1989
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenji Shirai, Yoshihisa Nomura
  • Hydraulic brake booster arrangement with parallel master cylinders and common housing for pivotable rocker
    Patent number: 4875338
    Abstract: A brake unit having a hydraulic brake booster and twin master cylinders in a common housing. The brake booster comprises a drive cylinder between the master cylinders which can be subjected to the outlet pressure of a brake valve of the brake booster which supplies an outlet pressure proportional to the pedal travel. A compensating cylinder, which jointly executes the strokes of the drive-cylinder piston and can likewise be subjected to the outlet pressure of the brake valve transmits the actuating forces generated by the drive cylinder to the pistons of the master cylinders via a rocker articulated pivotably on the compensating piston. The effective piston surface of the compensating cylinder is somewhat larger than that of the drive piston.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: October 24, 1989
    Assignee: Daimler-Benz Aktiengesellschaft
    Inventor: Heinz Leiber
  • Construction machine dual-dump hydraulic circuit with piloted arm-boom cylinder supply priority switching valves
    Patent number: 4875337
    Abstract: A hydraulic circuit for a construction machine which operates an actuator for working machine simultaneously with an actuator for working element without degrading the operation of the actuator for working machine. The hydraulic circuit comprises a first hydraulic pump, a first directional control valve connected to the first hydraulic pump and controlling an operation of the working machine actuator, a third directional control valve controlling an operation of the working element actuator, a second directional control valve connected to a second hydraulic pump, a first pilot operating device for controlling an operation of the first directional control valve and a second pilot operating device for controlling an operation of the third directional control valve.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: October 24, 1989
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Genroku Sugiyama, Toichi Hirata, Shinichi Satoh
  • Master cylinder pressure-retaining vehicular anti-theft brake locking mechanism
    Patent number: 4873824
    Abstract: A brake locking mechanism of the anti-theft type for use with an automobile vehicular brake system having one or more fluid operated brakes, a master cylinder and an actuator for reciprocating a piston in the cylinder to apply and release the brakes. The locking mechanism has a housing adapted to fit between the master cylinder and the actuator, means such as a ratcheted rod within the housing for reciprocating the piston responsively to the actuator, and means such as a pawl operatively associated with the ratcheted rod for locking the reciprocating means with the piston in the brake applying position. The locking means is remotely controlled from a keyed or combination lockable control mechanism located in the driving compartment of the vehicle which may be mechanical or electronic.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: October 17, 1989
    Inventor: Terry L. Cox
  • Single spool selector valve for simultaneous pump displacement and motor direction control in hydrostatic drive
    Patent number: 4869065
    Abstract: Reversible hydraulic motors drdiven by fluid from variable displacement pumps are useful in driving various mechanisms of earthmoving machines. It is desirable to control both the speed and direction of the motor with a single lever. The subject hydraulic control system includes a selector valve which has a fluid control section for directing pilot fluid to a reversing valve to reverse the direction of the motor. A signal control valve is mechanically actuated by movement of the selector valve to the operating position so that a regulated pressure control signal is directed to a displacement control of variable displacement pump to regulate the volumetric output of the pump and thus the operating speed of the motor.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: September 26, 1989
    Assignee: Caterpillar Inc.
    Inventor: DeLaney C. Hopkins
  • Double-acting master-slave cylinder system with volume compensating conduit
    Patent number: 4866937
    Abstract: A hydraulic master and slave cylinder assembly of the type in which a piston is positioned in the master cylinder, a piston rod is connected to the piston and extends out of the input end of the master cylinder, a piston is positioned in the slave cylinder, a piston rod is connected to the slave cylinder piston and extends out of the output end of the slave cylinder, a first conduit extends between the output end of the master cylinder and the input end of the slave cylinder, and a second conduit extends between the input end of the master cylinder and the output end of the slave cylinder.
    Type: Grant
    Filed: May 13, 1988
    Date of Patent: September 19, 1989
    Assignee: Automotive Products, plc
    Inventor: Keith V. Leigh-Monstevens
  • Jam resistant fluid power actuator for ballistic-damage tolerant redundant cylinder assemblies
    Patent number: 4867044
    Abstract: A hydraulic actuator having redundant cylinder assemblies, each assembly ng of lightweight and economical construction in having a relatively thin tubular wall reinforced to withstand hydraulic pressure by a layer of resin reinforced filament, the thickness and the material of the wall being such that petals formed from the wall by projectile penetration are sheared by engagement with a piston of the assembly as this piston is moved, together with an actuated element, by the piston of the other assembly.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: September 19, 1989
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: John W. Holtrop
  • Two-stage flow divider with pressure-relief valves in each stage to regulate flow in hydraulic system for working vehicles
    Patent number: 4866936
    Abstract: A hydraulic flow divider has first and second flow control valves each dividing its inflow into two flows. The first flow control has a pressure relief valve and a constant orifice dividing flow to two outlets. The second flow control further divides one of these flows into a second set of two output flows. One of the output flows of the second flow control valve is directed to a power steering cylinder while secondary output flow of the second flow control valve joins flow from the other outlet of the first flow control. The arrangement secures adequate fluid supply to a priority load of the hydraulic system at low pump drive engine speeds.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: September 19, 1989
    Assignee: Kanzaki Kokyukoki Mfg. Co. Ltd.
    Inventors: Ryota Ohashi, Masahisa Kawamura, Jiro Shibata
  • Master cylinder piston with floating sealing ring recuperation valve
    Patent number: 4866938
    Abstract: A hydraulic master cylinder piston carries a circumferential seal ring which allows recuperation flow valving. The floating seal has a reinforcing metal girdle which prevents radial expansion and axial crushing. The seal material resists extrusion and has an outer radius slightly greater than the radius of the circumferential girdle. A forward slotted bearing ring maintains the piston in alignment with the bore. During piston return, recuperation occurs through a path comprising the radial clearance between piston and floating seal ring and at least one slot or groove in the bearing ring. Upon full piston return, the seal is withdrawn from the master cylinder working chamber into a larger diameter bore communicating with the reservoir and thus allows relatively free make-up flow.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: September 19, 1989
    Assignee: Clayton Dewandre Co. Ltd.
    Inventors: Colm M. P. Keegan, Michael J. Hawker, Peter J. Goodwin
  • Pump drive speed regulator with control-pressure-generating valve having spring biased by cam face on load directional control valve
    Patent number: 4862691
    Abstract: Speed regulation of pump drive is set by a pressure-regulating valve providing a constant control pressure for a plurality of normal loads. If a high fluid consumption load such as the lifting cylinder of a forklift truck is to be simultaneously actuated the pump speed and net volumetric displacement must be increased. A higher speed-regulating control pressure from the pressure-regulating valve is required. The control valve for the high consumption load has a spool with an extending inclined cam contacting the biasing spring of the pressure-regulating valve. Upon actuation of this control valve the preload of the biasing spring is increased thereby adjusting the speed-regulating control pressure output of the pressure regulating valve. The pump engine or drive speed and the net volumetric displacement are increased.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: September 5, 1989
    Assignee: Mannesmann Rexroth GmbH
    Inventor: Werner Peschel
  • Piston-cylinder pulsator circuit with superplastic alloy pressure transmitting medium
    Patent number: 4860542
    Abstract: In a method for transmitting force from one piston to another piston, a superplastic alloy is used between the pistons as a pressure transmitting medium. An apparatus adopting the method serves as a force multiplication apparatus.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: August 29, 1989
    Assignee: UBE Industries, Ltd.
    Inventors: Haruaki Hatayama, Hideo Takei, Takuji Okabe, Yoshiharu Waku, Toyoaki Ueno
  • Compactor with hydraulic dwell and method
    Patent number: 4860646
    Abstract: A compactor includes a longitudinally extending ground supported frame having an open end and a closed end. A cylinder and piston assembly is positioned within the frame and extends longitudinally therealong and a ram is secured to the piston for transferring waste through the open end. The cylinder has fluid ports at opposite ends thereof. An hydraulic fluid supply assembly introduces pressurized fluid to said ports for causing selective movement of the piston relative to the cylinder. An hydraulic spool valve is carried by the piston for permitting fluid to flow between the ports and for thereby preventing displacement of the piston when the dwell assembly engages one of the ends.
    Type: Grant
    Filed: February 10, 1987
    Date of Patent: August 29, 1989
    Assignee: Marathon Corporation
    Inventor: Kent Spiers
  • Two stage relief valve for master cylinder quick-fill chamber
    Patent number: 4860541
    Abstract: A two stage relief valve for a quick-fill master cylinder (10). The two stage relief valve (54) has a ball (88) that is biased against a first seat (82) to control the flow of fluid from a quick-fill chamber (30) and a unitary structure (55, 74) which is biased against a second seat (70) to further control the flow of fluid from the quick-fill chamber (30). A first predetermined fluid pressure moves the ball (88) off the first seat (82) to allow fluid to escape from the quick-fill chamber (30). A second predetermined fluid pressure moves the unitary structure (55, 74) to allow additional fluid to escape and thereby limit the fluid pressure development in the quick-fill chamber (50).
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: August 29, 1989
    Assignee: Allied-Signal Inc.
    Inventor: John E. Steer