Bizarre Patents
A helium-filled sun shade for protecting individuals engaged in outdoor activities.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5101627 | Adjustable flow-combining restrictor for hydraulic excavator dual pump circuit An oil hydraulic circuit for a hydraulic shovel with which a composite operation can be performed readily and smoothly without special skill in operation of the hydraulic shovel. The oil hydraulic circuit comprises a first actuator which can operate with ... | 04/07/1992 |
| 5095697 | Control circuit for lift driven by variable displacement pump Described is a control circuit for a hydraulic power lift driven by a displacement pump which has a check valve releasable at least for lowering movements of the power lift, a actuation means switching the check valve off and on to control the flow from a... | 03/17/1992 |
| 5094081 | Hydraulic brake system valved piston A hydraulic vehicle brake system of the type having a high system return pressure is provided. In order to minimize the size and strength of brake return springs required, the invention provides a device to be interposed between the brake and the brake co... | 03/10/1992 |
| 5088383 | Multiplexed hydraulic control system with multiplexing valve having planar port array A multiplexed hydraulic control system which avoids the use of a rotary multiplexer and thereby allows for random selection of the multiplexed outlet ports and variable dwell times for the respective ports. A single hydraulic input is multiplexed among a ... | 02/18/1992 |
| 5081840 | Spool valve and piston power plant This power plant utilizes a multi-cylinder hydraulic engine that has a plurality of pistons and cylinders arranged for reciprocal movement. Each piston is powered by a hydraulic fluid or air pressure. The fluid exhausted from one cylinder is sent to anoth... | 01/21/1992 |
| 5081905 | Hydraulic pilot operation circuit and valve for quickly discharging oil A hydraulic control valve is controlled and changed over by a hydraulic pressure output from a remote control valve. A change-over valve is provided between an output port of the remote control valve and a pilot port of the hydraulic control valve. The ch... | 01/21/1992 |
| 5081903 | Multiplexed hydraulic control system with multi-bit binary selector signal control A multiplexed hydraulic control system having a plurality of hydraulic channels for individually controlling the positions of a plurality of actuators in the respective channels in accordance with a corresponding plurality of electrical control signals. T... | 01/21/1992 |
| 5077974 | Constant power displacement control cutoff system with adjustable relief valve Disclosed is a hydraulic control system mounted in a hydraulic circuit of a hydraulic excavator and adapted to increase the relief hydraulic pressure and the flow rate. In accordance with one aspect of the invention, a hydraulic control system for a hydra... | 01/07/1992 |
| 5072655 | Pistons for axial piston machines A piston for an axial piston machine, comprising a hollow body having an axial cavity into which a filler piece of a material of lower specific gravity than the material of the piston is inserted which at least partially fills said cavity, said filler pie... | 12/17/1991 |
| 5070699 | Rocker-actuated twin master cylinder A twin master cylinder for a road vehicle brake system has master cylinders assigned respectively, to a front-axle brake circuit and to a rear-axle brake circuit. The master cylinders are arranged laterally next to one another in a common housing and are ... | 12/10/1991 |
| 5067321 | Hydraulic hoisting circuit with electrical control for relief valve adjustment pilot and pilot disable valve A hydraulic circuit for a piece of construction equipment such as a hydraulic shovel. The operation of the hydraulic shovel is controlled by a number of hydraulic actuators which are provided with a high pressure oil through selector valves. A main relief... | 11/26/1991 |
| 5065577 | Hydromechanical displacement control for a power drive unit The problem of energy wastage in power drive units having fixed displacement hydraulic motors is avoided in a system having a variable displacement hydraulic motor (10) without the expense normally associated with such variable displacement systems by a c... | 11/19/1991 |
| 5065578 | Hydrostatic continously variable transmission with adjustable clutch valve In a hydrostatic continuously variable transmission in which a clutch valve capable of operating between a clutch-on position for setting a hydraulic closed circuit between a hydraulic pump and a hydraulic motor to a hydraulic transmitting state and a clu... | 11/19/1991 |
| 5065580 | Tandem master cylinder with limited-motion booster piston at pedal-remote end of master cylinder and with booster fluid cut valve A hydraulic braking system includes a piston disposed at a wall end of the bore of a master cylinder so as to move a normally open valve mechanism of the master cylinder toward a closed position by applying an output pressure from a boost device or dynami... | 11/19/1991 |
| 5063740 | Electrohydraulic servodevice for position control The position of a controlled system is regulated with a hydraulic actuator, which is directly linked to a hydraulic pump. The pump is driven in either direction by an electric motor, which is controlled by the output of rotatory direction and driving powe... | 11/12/1991 |
| 5063741 | Engine-speed responsive cavitation preventing system A hydraulic circuit suitable for use in a hydraulic operating circuit of a power shovel includes a hydraulic cylinder for driving a working component and a hydraulic change-over valve for selectively supplying the cylinder with a discharge oil pressure of... | 11/12/1991 |
| 5063831 | Piston pin bearing A crosshead piston bearing assembly is disclosed. The piston bearing comprises a part-cylindrical upper bearing segment, or slipper, and a pair of spaced part-cylindrical lower bearing segments, or ears, engageable with the upper segment to form a pair of... | 11/12/1991 |
| 5063742 | Method of controlling swing motion of a revolving superstructure and hydraulic control system for carrying out same A method of controlling the slewing of a revolving superstructure of a hydraulic backhoe includes setting a swing mode selector valve in a driving position to supply fluid discharged from a pump through a supply-and-discharge line to a hydraulic motor to ... | 11/12/1991 |
| 5062498 | Hydrostatic power transfer system with isolating accumulator A hydrostatic power transfer system for transferring power from a rotating power input shaft to a rotating output shaft comprises a fluid pump driven by the power input shaft. A pump outlet supplies pressurized fluid to a pressure accumulator disposed dow... | 11/05/1991 |
| 5060476 | Differential area motor circuit for hydrostatic transmission control In a hydraulic servo unit comprising a cylinder and a piston slidably inserted therein, the cylinder chamber being divided by a piston portion into a rod-side cylinder chamber and a head-side cylinder chamber, a control apparatus for the hydraulic servo u... | 10/29/1991 |
| 5060475 | Pilot control circuit for load sensing hydraulic systems Pilot control circuits are useful, for example, for controlling the actuation of main control valves of load sensing hydraulic systems. Using the main supply pump as the source of pressurized pilot fluid sometimes results in inadequate pilot pressure for ... | 10/29/1991 |
| 5058489 | Piston structure for internal combustion engine A piston structure for an internal combustion engine is provided. This piston includes an oval slipper skirt with a cross sectional profile in the form of an ellipse defined by preselected major and minor axes. A difference between the major and minor axe... | 10/22/1991 |
| 5056414 | Linear drive with hydraulic amplification A linear drive comprises a hydraulic unit (1), a control valve (5) and an actuating drive (9) with an actuating member (7). These elements are interconnected by means of two inertia drive starters (4, 8), which results in a mechanically-induced return mov... | 10/15/1991 |
| 5056312 | Hydraulic drive system for construction machines A hydraulic system for a construction machine comprising plural hydraulic actuators (23-28) driven by fluid supplied from a pump (22), first and second flow control valves (29-34) for controlling flows of fluid supplied to the first and second actuators, ... | 10/15/1991 |
| 5056412 | Brake servomotor assembly mounted on a stationary wall of a vehicle The invention relates to a brake servomotor assembly (1) consisting of a front half-shell (6) and a rear half-shell (8) and mounted on a stationary part (4, 40) of a vehicle by means of lugs (54, 56, 154) arranged in a plane perpendicular to the axis of t... | 10/15/1991 |
| 5054369 | Multiplexed hydraulic control system with plural selector valves A multiplexed hydraulic control system having a plurality of channels and a common source of modulated hydraulic fluid. The common source is shared among the plurality of channels by providing a plurality of selector valves, one for each channel, with ele... | 10/08/1991 |
| 5054289 | Hydraulic transmission When a first rotating shaft is rotationally driven, it rotates a first cylinder barrel splined thereto, and a second cylinder barrel and a valve block united with the first cylinder barrel. In accordance with these rotations, first pistons in first cylind... | 10/08/1991 |
| 5052274 | Tandem brake booster with return spring arrangement for rear piston chamber A rigid partition (18) internally delimiting a front space and a rear space in the outer casing (10) of a brake servo unit is fastened on an approximately cylindrical extension (14a) of a reinforcing plate (14) internally lining the front portion of the c... | 10/01/1991 |
| 5052280 | Coolable trunk piston for internal combustion engines In a two-piece piston with a head piece and a trunk hinged only over the piston pin, the annular space radially located inside the piston ring groove and open in the direction of the trunk is covered with a sheet metal wall part forming a cooling duct. Th... | 10/01/1991 |
| 5052273 | Flexible tubular wall pneumatic actuator with position transducer A pneumatic actuator includes a tubular body made of a rubber-like elastic material and a braided structure made of organic or inorganic high-tensile-strength fibers reinforcing an outside of the tubular body. Closure members sealingly close ends of the t... | 10/01/1991 |
| 5052281 | Internal combustion engine piston with top-land circumferential projection arrangement A piston installed into a cylinder of an engine includes annular projections formed in axially spaced relation on a top land facing a cylinder inner wall and having a saw-toothed cross-section in which the external diameter of the projections are such tha... | 10/01/1991 |
| 5052182 | Hydraulic brake booster system with check valve in brake fluid reservoir line A tandem master brake cylinder has first and second pistons, each piston associated with a fluid chamber and a pressure chamber. The pistons are displaced in response to actuation of a brake pedal. A hydraulic booster is coupled to a power source and is o... | 10/01/1991 |
| 5050382 | Tandem master cylinder for hydraulic brake systems A tandem master cylinder for hydraulic brake systems for automotive vehicles, with the brake systems comprising a brake pressure control means, in particular, an anti-locking control means. The tandem master cylinder has a push rod piston (7) and a floati... | 09/24/1991 |
| 5048292 | Dual pump traverse and feed system A single rod three chamber fluid motor is driven in a forward stroke which includes a rapid initial advance followed by a relatively short and slow feed stroke under high pressure. The rapid advance is performed by a closed loop system in which a high dis... | 09/17/1991 |
| 5048293 | Pump controlling apparatus for construction machine A hydraulic drive controlling apparatus for a construction machine has at least one variable displacement type hydraulic pump, a plurality of actuators driven with a hydraulic fluid from the hydraulic pump, directional control valves driven in accordance ... | 09/17/1991 |
| 5048394 | Multiplexed hydraulic control system with oscillator for multiplexer drive A multiplexed hydraulic control system in which high force margins for the multiplexer are achieved by employing hydraulic oscillators as the multiplexer driving means. The multiplexer is typically in the form of a hydraulic cylinder having an input port ... | 09/17/1991 |
| 5048294 | Safety device for hydraulic closed circuit A variable displacement hydraulic pump and a hydraulic motor are connected in a closed circuit. A pressure oil supply means includes the variable displacement hydraulic pump and a tilting controlling means for controlling a tilt angle of the hydraulic pum... | 09/17/1991 |
| 5046312 | Swivel speed control circuit for working vehicle A hydraulic circuit for controlling the deck swiveling speed of a working vehicle comprises a hydraulic actuator for driving the swivel deck, a flow control valve for controlling a rate of oil flow to the hydraulic actuator, and a direction control valve ... | 09/10/1991 |
| 5046310 | Load-independent control device for hydraulic load devices A control device transmits hydraulic pressure from a continuously circulating pump to a hydraulic device. A pressure limiting valve communicates with the pump to exhaust the pump to reservoir when the system is in a stand-by mode. The control device inclu... | 09/10/1991 |
| 5044161 | Dual external pin reservoir valves for tandem master cylinder assembly A tandem master cylinder in which the primary piston and the secondary piston are configured in the shape of plunger pistons which are captivated to each other in the longitudinal bore of the cylinder housing. A cylindrical bushing is provided in the hous... | 09/03/1991 |
