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7685929 Bore sealing telescopic hoist  
The present invention provides a telescopic hoist comprising a series of telescopically arranged tubular sections wherein the tubular sections are made in nitrided steel.
6070513 Load transfer device for tandem mounted actuators  
A load transfer device for use with tandem mounted actuators. The load transfer device includes an actuator coupling assembly and a ground connection assembly. The actuator coupling assembly...
5992825 Portable expansion device  
An expansion device for doing work comprised of a housing including first and second selectively expandable sections defining an internal chamber which contains a chemical motor. Upon activation...
5427229 Control system for reciprocating floor conveyor  
A plurality of drive motors are operated by fluid pressure for reciprocating the floor slats of a reciprocating floor conveyor. A switching valve alternately connects the forward and rear ends of...
5305605 Hydraulic piston and cylinder unit  
An hydraulic piston and cylinder unit with a piston rod and first and second cylinders. The piston rod extends into the first cylinder, and the first cylinder extends into the second cylinder. The...
5249502 Double action, dual speed and force hydraulic actuators  
A hydraulic fluid Pressure-operated actuator comprises a first cylinder assembly having an output which operatively carries a second cylinder assembly such that an axial output force is effected...
5099748 Pneumatic system for telescopic hoist  
A telescopic pneumatic hoist has a flexible stationary hollow probe on its base arranged to unseat a check ball in the piston of the lowest intermediate stage when the piston is near the base....
4986074 Hydraulic cylinder control system for garbage collection truck lift-dump handler  
An article handling apparatus is disclosed which comprises two independently controllable fluid actuated drives. The first fluid actuated drive comprises a cylinder and a differential piston which...
4969387 Hydraulic drive unit with single piston rod and plural cylinder bodies  
A plurality of piston heads (P1, P2, P3) are spaced apart along the length of a single piston rod (R). A separate traveling cylinder body (CB1, CB2, CB3) is associated with each piston head (P1,...
4821868 Drive/frame assembly for a reciprocating floor  
Piston rods (60, 62) of three linear hydraulic motors (36, 38, 40) are connected at their outer ends (64, 68) to two spaced apart transverse frame members (10, 12). A cylinder housing (72) is...
4748392 Servo-control system for the steerable front wheels of a vehicle  
A servo-control system is provided for the steerable front wheels of a vehicle, particularly the steerable nose gear of an aircraft, at least the lower part of which having at least one wheel may...
4712467 Combined linear hydraulic motor and transfer valve  
Piston rods of three linear hydraulic motors are connected at their outer ends to two spaced apart transverse frame members. A cylinder housing is driven back and forth along each pair of piston...
4658703 Method and apparatus for extracting heat and mechanical energy from a pressured gas  
A piston type expander/prime mover utilizes a plurality of pairs of cylinders mounted on a rotatable cylinder support. Each cylinder has an open end and a closed end and each pair of cylinders has...
4586426 Multi-cylinder piston engine and method of operation thereof  
Apparatus for producing a reciprocating oscillation of a power output shaft comprises a plurality of peripherally spaced cylinders disposed in generally tangential relationship to the periphery of...
4526086 Piston-cylinder assembly  
A piston-cylinder assembly for displacing a load through a long stroke consists of a rod, a piston slidable on the rod and by fluid pressure the piston is clamped to the rod, and a cylinder in...
4510845 Pressure-medium-driven linear driving arrangement  
A pressure-medium-driven linear driving arrangement comprises a slide-shaped driving unit supported on a feed rack with a sliding curve. The driving unit comprising step-by-step elements in the...
4500250 Backhoe swing mechanism  
An improved hydraulic swing mechanism is disclosed for operation of the boom assembly of a backhoe or similar implement. The swing mechanism includes a pair of double-acting hydraulic motors...
4457656 Stack assembling apparatus and technique  
Stack handling apparatus includes an input delivery section having two spaced apart conveyor segments operatively arranged to move equidistantly with respect to a centerline between the two...
4403905 Operating mechanism for a swing mechanism valve  
An improved hydraulic swing mechanism for a material handling implement, such as a backhoe, includes a multi-position, hydraulic sequencing valve for directing the flow of hydraulic fluid to...
4341501 Hydraulic control valve circuit for a swing mechanism  
A unique hydraulic circuit is provided for converting rectilinear motion to rotational motion about an axis through the use of two pivotally mounted hydraulic motors. The hydraulic motors are...
4313364 Dual cylinder linear servo motor  
Servoactuator includes a pair of double-acting linear actuators providing for 360° controlled rotation of an output shaft. The rotary motion of the ouput shaft is employed to sequence high...
4243355 Lift truck rotator with pressure-relieved valving  
A rotator attachment for rotating a load handling mechanism on a lift truck includes a frame carrying an inner gear with external teeth and rotatable about a longitudinal axis of the truck. An...
4240327 Fluid operated linear actuator control system  
A fluid operated linear actuator control system for drive arrangements of the type wherein two fluid operated linear actuators act upon a shaft at an angle with respect to each other for causing...
4187763 Overload relief valve  
An overload relief valve for use in preventing damage to the hydraulic system for adjustably positioning a working element, such as a blade. A single relief valve permits relief of high fluid...
4126083 Attitude control for implement  
In a vehicle including a stick cylinder movable to change the attitude of a stick relative to a boom, and an implement cylinder movable to change the inclination of an implement relative to the...
4104955 Compressed air-operated motor employing an air distributor  
A compressed air-operated motor driven from a rechargeable compressed air supply tank. The motor has sets of symmetrically opposing cylinders having spring-biased air admission valves and...
4066004 Oscillatory electro-hydraulic system  
An oscillatory electro-hydraulic system for a material handling bucket and including two hydraulic cylinder assemblies connectable with the bucket for tipping the bucket, and including a hydraulic...
3989117 Hydraulic drive system for a work vehicle or tractor  
Each of two drive wheels on a vehicle is independently driven by a wheel motor having four single acting hydraulic cylinders. Both wheel motors are supplied by a common engine driven pump. Two...
3835823 ORBITAL SEALED CHAMBER ENGINE  
An orbital sealed chamber engine comprising a two stroke single cycle engine in which the engine block and the two headed piston therein are respectively mounted and arranged to move in orbital...
3791264 POWER TRANSMISSION DEVICE FOR ROTATING A GRADER CIRCLE  
A grader circle has an annular internal gear which is meshed with a gear carried at the bottom of a crank shaft. A pair of double-acting hydraulic actuators have their piston rods connected to the...
3757642 SWING MECHANISM FOR PIVOTED MEMBER  
A backhoe mounted on a wheeled vehicle and having a mechanism for swinging the backhoe boom structure to positions on either side of a central axis. The swing mechanism comprises a pair of...
3724334 MECHANICAL DRIVING  
A fluid device including, in a first aspect, a fixed member defining a first cam surface having m cycles, a movable member defining a second cam surface having n cycles, and a movable piston...
3720139 OSCILLATING STEAM ENGINE  
An oscillating steam engine has a frame including a valve plate with opposite planar faces arranged vertically and normal to the engine crank shaft. A first cylinder incorporates a plate having...
3656405 PRESSURIZED MEDIUM MOTOR  
A pressurized medium motor comprising a housing, a plurality of opposed pivotally mounted piston and cylinder units in the housing and adapted to be successively supplied with pressurized medium,...
3650179 COMPRESSED GAS OPERATED ENGINE  
This engine is operated by compressed gas and comprises two cylinders with pistons therein, on piston rods that are pivoted to cranks fixed to a control shaft. This shaft carries a gear meshing...
3648566 FORCE VECTOR DIRECTION CONTROL  
A settable control to maintain a selected resultant force vector of lift and pull cylinders of a fluid system operated walking mechanism for heavy equipment, which control has members to simulate...
3630120 SWINGING APPARATUS  
An apparatus for converting rectilinear motion to rotational motion about a first axis having two pivotal members fixed about and rotatable with respect to each other and to the first axis, two...
3621759 FLUID PRESSURE ENGINE AND VALVING SYSTEM THEREFOR  
3587402 PRESSURE MEDIUM OPERABLE DRIVE FOR GIANT ANTIFRICTION BEARINGS  
3583283 HYDRAULIC MOTOR  
A hydraulic motor of the type having reciprocating pistons within cylinders and having two separate valve devices. The first times the strokes of the pistons, the second determines whether the...
3554090 FLUID PRESSURE ACTUATED MOTOR  
This invention relates to a fluid pressure actuated motor. More particularly, the invention relates to a fluid pressure actuated motor having a crankshaft within a closed housing and a plurality...
3516333 HYDRAULIC TORQUE AMPLIFIERS  
3511131 HYDRAULIC MOTOR  
3511135 VARIABLE SPEED HYDRAULIC MOTORS  
3508465 FLUID MOTOR  
3473440 LINEAR HYDRAULIC MOTORS  
3424059 LINEAR HYDRAULIC MOTORS  
3405605 Hydraulic pump jack means  
3370511 Steam engine  
3367240 Rotary engine  

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