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7634911 Energy recovery system  
An energy recovery system for a machine is disclosed. The energy recovery system may have a pump configured to provide a flow of pressurized fluid. The energy recovery system may also have a first...
7559523 Dual-cylinder blowout preventer operator system  
A hydraulic blowout preventer operator comprises a first piston rod coupled to a closure member. The operator further comprises a first operator housing coupled to a bonnet and a head. The first...
7240771 Mast staging hydraulic circuit  
A multistage mast assembly for use on a lift truck and method of operation for staging first and second mast sections of the multistage mast assembly. Each mast section has a retracted position and...
7137331 Hydraulic cylinder device  
A pair of hydraulic cylinders 10 which are coupled to a driven member, placed parallel to each other and extend/contract in synchronization with each other, and a control valve 20 which...
7114429 Power steering assist apparatus and method of retrofitting  
A power steering assembly and method of retrofitting therefore includes a housing having a cavity defined therein. A drive member extends axially into the cavity and a first piston and a second...
6997221 Reach actuation for energy saving hydraulic knuckle booms  
The knuckle boom includes a hoist boom having a proximal end pivoted to a machine base, and a stick boom having a proximal end pivoted to a distal end of the hoist boom. At least one hydraulic...
6715402 Hydraulic control circuit for operating a split actuator mechanical mechanism  
A system for simultaneously operating first and second hydraulic cylinders has an inlet node for connection to a source of pressurized fluid and an outlet node for connection to a tank. A...
6584884 Integral valve-cylinder assembly and fork positioning system  
An integral valve-cylinder assembly and a fork folding hydraulic system for front loading waste collection vehicles is provided that allows the forks to be full tucked for over-the-road travel and...
6397726 Device for path-dependent control of force generated by a piston  
The invention provides a method and apparatus for controlling in a path-dependent manner the force generated by a piston. A first piston travels in a first cylinder—divided into a first and...
5664479 Tandem vacuum booster  
A tandem vacuum booster includes a front shell and a rear shell which are connected to each other to form a housing, a front movable wall having an outer circumferential portion that is fit in a...
5570622 Power booster with guided power piston  
A guide rod extends longitudinally through the power piston of a vacuum power booster providing lateral support thereto and tying the master cylinder housing to a bracket on the rear of the power...
5522302 Cylinder and piston assembly and method of porting  
A multi-piston assembly is illustrated wherein a cylindrical housing (A) is ported through longitudinal circumferentially spaced ports (F) and (G) carried within the cylindrical housing. Porting...
5450781 Booster  
An improvement of the inner periphery of a power piston which is connected to a valve body of a booster is disclosed. The inner periphery of the power piston comprises a radial portion which is...
5323689 Method of manufacturing a tandem brake booster  
A method of manufacturing a tandem brake booster by selectively choosing a front shell having a first cylindrical body with first effective diameter, a transition shell having a second cylindrical...
5308215 Passenger lift movable at variable speeds  
A hydraulic drive passenger lift with distinct lifting "up and down" (loading, unloading) and "fold-unfold" (storage) motion patterns, includes a flow control structure that accommodates various...
5305606 Actuating unit for hydraulic brake systems  
The present invention discloses an actuating unit that achieves shortening of the actuating travel of the brake power booster when the brake system is precharged. The actuating unit is preferably...
5277100 Tandem type vacuum booster  
In a tandem type vacuum booster, the inner peripheral end of a front booster piston and the inner peripheral bead of a front diaphragm are clamped between a front end of a sleeve fitted over the...
5233911 Tandem brake booster  
A method of manufacturing a tandem brake booster wherein a rearwall is derived from the separation plate of a single brake booster. The separation plate is modified by creating a passageway...
5214996 Vacuum brake-booster of the tandem type  
The invention relates to a vacuum brake-booster of the tandem type comprising two compartments (22, 24) separated by a stationary plate (20), each of the compartments being divided into a front...
5142964 Negative pressure booster  
A negative brake booster having a power piston 8 with a piston unit 8a extending in a radial direction, a cylinder unit 8b provided at a backward position in an axial direction and airtightly and...
5111734 Booster  
An improvement of a variable pressure passage which is formed in a valve body of a booster, for example, a brake booster, is disclosed. The valve body which is disposed within a shell of the...
5086690 Booster interlock divider and diaphragm concept  
A peripheral sealed interlock for a dual diaphragm tandem vacuum booster with front and rear housings is provided. An outer radial peripheral end of a divider of the inventive interlock is greatly...
5083495 Brake booster with one-way valve on centerplate  
A brake booster includes a center plate disposed within a shell. A seal member is provided to interrupt a communication between a variable and a constant pressure chamber which are located across...
5063830 Brake booster  
An improvement relating to a front shell of a brake booster and a reinforcing plate which is connected to and extends along the inner surface of the front shell is disclosed. A radially inward...
4922804 Variable speed hydraulic unit  
The variable speed hydraulic unit has the peculiarity of comprising a fixed body and a rotatable body with hydraulic actuation and fixed displacement, which are operatively interconnected. The...
4896748 Full free lift mast assembly  
A full free lift mast assembly having a first pair of spaced apart uprights, a second pair of spaced apart uprights mounted on the first pair of uprights and elevationally movable therealong and a...
4882979 Dual-piston acuator  
A fluid-powered actuator having a body with first and second end walls, with a bulkhead positioned therebetween, which is adjustably rotatable to angularly position the bulkhead relative to the...
4759260 Super reliable air-spring return air cylinder  
This invention relates to a fail-safe or auto-return actuator cylinder employing the air spring effect provided by compressed air trapped in an air-spring compartment; which air spring effect...
4706710 Cylinder-mounted rotary valve  
A cylinder valve includes a body with a threaded extension defining a first output port which screws directly into the cylinder port. An input port connected to a source of hydraulic fluid...
4651843 Compact assisted steering system for a motor vehicle  
The mechanism comprises two movable cylinders (7, 9) which are sealingly slidably mounted on respective stationary pistons which are firmly carried by rods (3, 4) mounted in a stationary casing...
4650377 Right angle drill  
An improved right angle drill including a pneumatically powered motor and feed and retract apparatus driven by the motor. The feed and retract apparatus includes a control valve for controlling the...
4516474 Tandem diaphragm brake booster  
A tandem diaphragm brake booster includes a housing, first and second diaphragms disposed in said housing, a partition wall disposed between said first and second diaphragms within said housing for...
4430924 Petroleum pumping unit  
A petroleum pumping unit which is especially suitable for use in remote oil fields and under unpredictable pumping conditions is disclosed. The petroleum pumping unit of the present invention,...
4377966 Servo boosters for vehicle braking systems  
In a servo booster for a vehicle braking system, of the kind having a tie rod for relieving the booster housing of braking reaction forces which extends through the movable wall(s) of the booster,...
4335733 Valve for use in handling abrasive materials and method of wear prevention  
A valve, comprising: a cylindrical casing, closed at its ends by covers, and having axially aligned inlet and outlet chambers midway of its length disposed at right angles to the axis of the...
RE30934 Hydraulic drive for the die closing unit of an injection molding machine  
A hydraulic drive for the die closing unit of an injection molding machine in which at least one power cylinder and power piston with a coaxially attached auxiliary cylinder opens and closes the...
4280326 Generators of impulses  
An apparatus for use in the generation of impulses, comprising a stepped piston assembly having a large piston and a small piston mechanically linked to one another and reciprocable between forward...
4253379 Fluid control system  
This invention relates to a pneumatic cylinder and valve control system in which a block and two plates bolted to the block form one end of the cylinder. This block and plate combination, moreover,...
4235154 Vibration motor  
A vibration motor comprising a rotor arranged within a cylindrical chamber having opposed radially arranged reciprocating pistons within cylinders opening into the chamber. Circumferential grooves...
4207805 Feed beam  
A feed beam for a rock drill comprises a box girder (13), a saddle (10) slidable along the box girder, and two power units (20,20a) inserted into the ends of the box girder. Each power unit...
4188857 Reciprocating pneumatic sanding and rubbing machine  
A reciprocating sanding and rubbing machine has a shoe portion to which the sanding or rubbing member is attached, this shoe portion being connected through a rack and pinion drive gear assembly to...
4178838 Oil porting system for dual cylinder vibrator  
A system for porting of hydraulic fluid in a hydraulically driven seismic energy vibrator of the reciprocating mass type. A mass is reciprocated relative to an earth contacting frame which includes...
4141281 Pressure fluid operated feed drive system for a movable member  
A pressure fluid operated feed drive system for a movable member, and particularly for a slide of a machine tool, the system having a source of fluid pressure feeding a pair of interconnected...
4036309 Double-piston rock drill  
A rock drill has a housing accommodating pistons defining working chambers. Rotary drive of a drill steel has an overrunning clutch and a screw pair. The screw pair is arranged between the pistons...
4010630 Hydraulic actuated power tool  
The hydraulic actuated power tool includes a barrel having an internal, annular bulkhead separating the barrel into two cylinder chambers. A single piston shaft having two pistons thereon operates...
4005974 Mold-closing unit, particularly for injection-molding machines  
A mold closing unit for an injection molding machine having a double acting mold closing piston, a closable valve interconnecting both sides of the piston, an auxiliary piston, and a piston rod for...
4005598 Pneumatic blind riveter with cascaded pistons  
A blind riveter has a housing with a tubular body and a nosepiece containing a rivet-mandrel-gripping chuck extending transverse to this body. The body is provided with three in-line tubes...
3991657 Vaned hydraulic motor  
A vaned hydraulic motor which includes a rotor adapted to rotate in excess of 180° with respect to the stator, has, in an axial juxtaposition, a middle circumference annular chamber and two outer...
3824896 HYDRAULIC COMPRESSION CIRCUITS  
The cycle of operation of a compression platen or the like reciprocated by a main cylinder by adding one or more additional cylinders having piston rods engaging the platen. Fluid pressure is...
3818801 FLUID ACTUATING MECHANISM HAVING ALTERNATIVELY SELECTABLE FAST AND SLOW MODES OF OPERATION  
A fluid actuating mechanism is provided having mechanically intercoupled first and second piston and cylinder units coupled with a fluid source and control circuit to selectively enable fast or...
Matches 1 - 50 out of 90 1 2 >