Abstract: A ram-type valve assembly for well blowout prevention applications and the like. Opposing ram assemblies disposed in ram guideways transverse to the valve bore are each provided with two pistons extending outward of the valve housing having internal passages communicating with respective passages internal of the housing terminating in respective closing and opening ports. A cylinder assembly with interconnected cylindrical chambers is slidably disposed about respective pistons. Pressurizing the closing or opening ports transmits pressure through the pistons to the chambers, effecting cylinder assembly movement along the pistons inward toward and outward from the bore, respectively. Each cylinder assembly is interconnected to its respective ram, transmitting cylinder movement to the ram. The hydraulic circuits are isolated from the bore preventing hydraulic circuit contamination and accidental ram opening from bore pressure leaks into the hydraulics.

Abstract: Apparatus for generating linear motion comprises a body on one end of which is mounted a cylinder. A piston in the cylinder is joined to an actuating beam extending into the body. The actuating beam has moving surfaces that cooperate with fixed surfaces in the body to define a linear bearing. Fluid under pressure is introduced through a duct in the body to a port in the fixed surface of the linear bearing. It enters the space in the cylinder above the piston via a port in a moving surface of the actuating beam which leads to a duct in the actuating beam that opens through the crown of the piston. A resilient sealing member between the fixed and moving surface of the linear bearing maintains fluid-tight communication between the fixed and movable part over their range of relative movement. The actuating beam may carry a rack that drives a pinion through ninety degrees as the piston travels, and two opposed cylinders may be provided to give a reciprocatory movement, or a spring return may be provided.

Abstract: A clamping element comprises a single-acting cylinder and a piston with strong spring return which can be cancelled out by introduction of a pressure medium into the pressure chamber of the cylinder. The spring return is brought about, at least mainly, by means of a sleeve (6a, 6b) of rubber or rubber-like material which occupies a gap (5, 5b) between the piston (3, 3a, 3b) and the cylinder wall (7, 7a, 7b) or a lining (40) arranged in the cylinder. The rubber sleeve is firmly vulcanized, firmly glued or surface-fixed in some other manner against the cylindrical exterior of the piston and against the wall of the cylinder or the said lining along an axial length which considerably exceeds the thickness of the gap.

Abstract: An improved power steering control apparatus includes a power steering motor having a piston rod which extends through one end of the motor cylinder. This results in the rod end of the piston having a smaller working area than the head end of the piston. In order to equalize the fluid pressure forces on opposite sides of the piston when the motor is in an inactive condition, a power steering control valve vents both sides of the piston to atmospheric pressure when the control valve is in a neutral or unactuated condition.

Abstract: A track guided vehicle is provided which includes laterally projecting transverse guide rollers mounted on support arms extending in a direction parallel to a direction of travel of the vehicle. The guide rollers are adapted to be retractable and extendable to an operating position through a guide arrangement which is directed diagonally upwardly and inwardly with a bilaterally effective operating element being disposed concentrically within the guide arrangement. The transverse guide rollers are elastically flexible in a transverse direction and are adapted to utilize an on board compressed air system to displace the transverse guide rollers and fluidic operating or working element which is constructed for pneumatic pressure application.

Abstract: Disclosed is a pressure cylinder apparatus having a cylinder and a slidable member such as a ram or piston which is slidable back and forth in response to charging and discharging of fluid into and out of the cylinder, wherein that the said slidable member has a polygonal cross-sectional shape and that the said stopper assembly having an aperture of a polygonal shape corresponding to the polygonal cross-section of the slidable member is provided in the plane perpendicular to the direction of movement of the slidable member so that the stopper assembly prevents or limits the undesirable rotation of the slidable member during outward movement of the slidable member, and disclosed also is a hydraulic press incorporating the pressure cylinder apparatus stated above, and the end surface of the said slidable member is shaped and sized to conform with the press mold part to which the end surface portion is connected.

Abstract: A hydraulic mine prop includes an inner piston-like prop guided within an outer cylinder-like prop, and a roof fall valve. The interior space of said inner prop communicates freely with the working chamber of the prop, and the roof fall valve is arranged outwardly on the prop and rigidly secured thereon, the valve being connected to the working chamber by an orifice provided in the prop and leading to the working chamber. The cross-sectional area of the roof fall valve in its open position.

Abstract: The vacuum chamber includes an airtight generally cylindrical wall and a pair of end members. Vacuum pumps in the chamber evacuate the chamber. The chamber is rotated along the longitudinal axis whereby the centrifugal force of the rotating cylindrical wall acts against the force resulting from the pressure differential between the inside of the evaluated chamber and ambient pressure on the outside of the cylindrical wall to prevent the cylindrical wall from collapsing. An inner member is mounted in the chamber, but the chamber rotates with respect to the inner member. In a low temperature embodiment for freeze drying refrigerated air cools the outside of the chamber to reduce the temperature within the chamber. The consensables condense on the inside of the cold cylindrical wall.

Abstract: A linearly driven rotary actuator has a tool or implement attached to the end of the output shaft. Various fluid lines are provided to drive the tool or implement as required. To prevent twisting and wrapping of fluid lines around the actuator, a rotary fluid coupling is provided as an integral part of the actuator housing.

Abstract: An internal fluid communication system in combination with a fluid operated power cylinder, such as that used on industrial lift trucks, in which a pair of tubular sections in telescopic relationship is disposed lengthwise within the power cylinder, forming a fluid passageway through the cylinder for transmitting fluid from one end of the cylinder to the other. The cylinder may be of either the ram or the cylinder and piston type. Two or more tubular sections may surround the first tubular section and form a plurality of parallel fluid passages passing through the power cylinder from one end to the other without communicating with the operating fluid in the cylinder. In the embodiment of the invention applicable to a cylinder and piston type hydraulic motor, one tubular section is disposed in the piston rod and the other tubular section passes through the piston and is in telescopic relationship with the tubular section in the piston rod.

Abstract: A multiple component applicator system for simultaneously metering a plurality of flowable materials and for delivering the metered quantities in predetermined proportions to a mixing device wherein the flowable materials are mixed and then dispensed. The system includes an improved metering and proportioning device as well as an improved modular control system for facilitating rapid interchangeability of the flowable materials being dispensed from the apparatus.

Abstract: A vacuum motor includes a cylindrical housing with a mount plate at one end and an end wall at its other end terminating in a guide tube. A stem, adapted for connection to an intermittently actuated vacuum source projects into and is secured to the mount plate and is adapted for securing to a support. A cylinder is nested within the housing open at one end and at its other end is axially recessed to define with the mount plate a first vacuum chamber communicating with the stem bore. A hollow reciprocal piston open at one end is sealed within the cylinder a and terminates in a tubular piston rod which projects outwardly of the guide tube adapted for connection to a load to be moved a predetermined distance. The interior of the piston defines with the cylinder a power air chamber communicating with the piston rod and atmosphere. The piston defines with the housing end wall a second vacuum chamber which is in communication with the first vacuum chamber.

Abstract: Liquid fluid pressure applied to a piston causes advancement thereof at a rapid rate until an external resisting load applied to the piston rod exceeds a predetermined value producing a corresponding increase in the pressure within the opposing pressure chambers to which the piston is exposed. Bi-directional flow, conducted between the opposing chambers during rapid piston movement, is automatically blocked by a differential circuit pressure operated piston valve to cause a rapid increase in the differential pressures acting on the piston, and an increase in the value of the external piston rod load with a corresponding decrease in its rate of movement in the same direction. A modified embodiment permits the piston rod to act under pressure and with a force in both the extending and retracting phases of the stroke with the same rapid extending rate until the external resisting force is encountered.

Abstract: A hydraulic actuator, readily assemble and disassemble, which can be used for effecting actuation of food processing machinery or bulk bait or other commodity dispensers. Since it is necessary that such devices be safe and non-polluting, components which come in contact with the hydraulic fluid can be made of plastic so that tap water can be utilized as the hydraulic fluid.The actuator is made readily assemble and disassemble by including devices for quick and easy sealing and locking of the component parts. These devices have only a minimal number of subcomponents.

Abstract: The present servomotor has a working piston in a piston cylinder. The worg piston is connected to a spindle having a relatively high pitch. The spindle is attached at one end thereof to a control disk system comprising three control disks. The two outer control disks are rigidly connected to the spindle, and the central control disk is connected to a digital stepping motor. The central disk is arranged between the two outer control disks so that the central disk may rotate substantially free of play, whereby the rated position of a stepping drive motor corresponds precisely to the actual position of a linear output member, such as a piston rod.

Abstract: An adjustable stroke piston and cylinder combination including a piston fixed to one end of a piston rod that extends from one end of the cylinder, and an auxiliary piston is in sealed engagement with the cylinder means and the piston rod and is slidable on the piston rod, the piston rod is tubular with pressure supply ports therein connecting its bore to a point intermediate the piston and auxiliary piston while a liquid supply means connects to the one end of the cylinder means to supply pressure liquid intermediate the closed end of the cylinder means and the auxiliary piston to move the same axially on the piston rod to control the effective length of the piston stroke in the cylinder means.

Abstract: A stroke-adjusting drive mechanism in which the stroke of a reciprocating member, such as a piston, is adjustable for use in machines such as hydraulic presses and press brakes is disclosed. The apparatus includes a cylinder and piston with a piston rod member which projects outwardly from the cylinder. A restricting valve means is arranged between a chamber of the cylinder defined by the piston member and a hydraulic passage connected with a hydraulic pump. An adjusting member is arranged in the piston rod member so as to be adjustably positioned along the axis thereof and a regulating valve is provided for restricting the flow of hydraulic fluid from the first chamber in response to changes of pressure and the hydraulic passage. By means of the apparatus of the present invention, the stroke length of the piston member can be easily and precisely adjusted as well as stopped at a desired position.

Abstract: A valve actuator includes a hydraulic cylinder with a pair of pistons separately, slidably mounted therein for movement between a first end and a second end of the cylinder. An actuator rod is joined to a first of the pistons to extend through an opening in the first end of the cylinder to terminate exterior thereto and be capable of being joined to a valve stem. A high pressure gas accumulator is mounted on the cylinder to locate the second end thereof within the accumulator. The second end of the cylinder has an end closure with access therethrough to allow communication between the interior of the accumulator and a first side of the second piston of the pair. Normally, hydraulic oil is supplied to the cylinder to act on the first piston thereby causing both pistons to move axially against the high pressure gas of the accumulator which, in turn, axially moves the pistons when the hydraulic fluid is discharged.

Abstract: A power steering gear mechanism is disclosed having conventional elements such as a double acting cylinder in a housing, a piston with a gear rack geared to a gear sector, and threaded bore in the piston having a worm shaft, wherein a steering shaft operates a rotary valve spool with which it is integral, in rotation relative a fixed valve sleeve carried by the worm shaft and wherein a torque rod connects the worm shaft to the steering spindle and passes through the worm shaft. The novelty of the invention resides in hydraulic circuitry and in the placement of a pin carried by the worm shaft and passing through a bore in the body of the valve spool just beyond one end of the channelled flow control area, the steering shaft extending from the other end of the valve spool. The pin effects rotation of the worm shaft by engaging the side of the bore through the valve spool body during twisting of the torque rod to effect piston movement.

Abstract: A compact construction for a vehicle steering gear is provided of the rotary valve type which utilizes a torque rod having an end connected to a worm shaft and the opposite end connected to a steering spindle wherein axial load oil pressure on the torque rod is minimized to avoid breakage. This is accomplished by hydraulic circuitry which routes high inlet pressure to the valve housing directly to the valve grooving instead of to an end of the valve body where it would exert an axial force on the torque rod.

Abstract: A rack and pinion power steering device includes a housing within which the pinion engages the rack to impart movement to the rack upon rotation of the pinion. The rack includes a bore for slidably receiving a pair of plugs which support the rack and a rod which extend through the plugs and housing to engage a pair of dirigible wheels. The plugs cooperate with the rod to form pressure chambers and a valve member carried by the rack cooperates with projections on the rod to communicate pressurized fluid from a pressure source to either of the pressure chambers whereupon the pressurized fluid therein urges the rod to move relative to the housing. The rod also provides for communication of pressurized fluid from the pressure source to the valve member via a passage therein.

Abstract: A heavy-duty disc brake assembly and pneumatic actuating assembly therefor. The pneumatic actuating assembly may include a pair of annular pistons operatively connected for simultaneous movement thereof, apparatus being provided for supplying air under pressure to the working faces thereof, or a single piston spring biased to braking position with apparatus for supplying air under pressure to either face thereof. The disc brake assembly includes a plurality of relatively movable rotor and stator discs, and preferably a closed cooling system with circulatory loop is provided.

Abstract: A double-acting hydraulic cylinder includes a hollow cylinder body with a closed end and an end with a first rod opening. A first hollow piston and rod assembly, having a second rod opening at the piston end, projects through the first rod opening and slides in the cylinder body. A second hollow piston and rod assembly, secured at the rod end to the hollow cylinder body, projects through the second rod opening and slides in the first hollow piston and rod assembly. The first and second hollow piston and rod assemblies cooperate to form a first variable volume chamber. A rod secured to the rod end of the first hollow piston and rod assembly slidably projects into the second hollow piston and rod assembly and cooperates therewith to form a second variable volume chamber. The first variable volume chamber is connected to a first port in the cylinder body and is expandable and contractable in response respectively to retraction and extension of the first hollow piston and rod assembly.

Abstract: There is herein disclosed a lift control system for a press unloader having an extendable and retractable jaw means for gripping and removing a part from the die cavity of a press with pivotal frame means supporting the jaw means for pivotal movement to lift the part from the die cavity and interconnected air operated power cylinder means to sequentially extend the jaw means, grip the part, lift the part, and retract the jaw means.

Abstract: The ends of travel of pneumatic jacks are controlled so as to obtain signals which are directly utilizable in fluidics by means of a device comprising a main jack-piston with a hollow operating stem fitted with a plunger and a positionally-adjustable regulating stem, a main cylinder and auxiliary cylinder having control ports for driving fluid and communicating with stationary fluidic control ports, and adjustable fluidic control means actuated in dependence on the position of the regulating stem with respect to a cylindrical slide-valve.

Abstract: A pneumatic-hydraulic pumping device including a jacket member, a cap member mounted at one end of the jacket member and an hydraulic head member mounted at the opposite end of the jacket member. An air head member is mounted in the jacket member intermediate the cap and hydraulic head members to form an air piston chamber between the cap member and the air head member and an hydraulic fluid reservoir space in the jacket between the hydraulic head member and the air head member. An air piston means including a piston head and a piston rod fastened thereto is mounted for reciprocal movement in power stroke and exhaust directions inside the air piston chamber with the piston rod being slidably mounted in the air head member. An air piston return means is mounted in the jacket for moving the piston means in the exhaust stroke direction. The air head member is connected to a source of air pressure by a conduit means.

Abstract: A structure for propelling a pipeline as it is continuously formed at a construction site, wherein the formed pipeline is cap sealed at its leading end and is sealed adjacent its other end by a piston on which the pipeline slides as it is formed. The pipeline is propelled by admitting pressurized fluid through the piston from a delivery tube communicating through the piston with the interior of the seal pipeline and a stop or stops are provided to engage the delivery tube whereby thrust is applied to the cap sealed end of the pipeline.