Abstract: A two step pressure intensifier adapted for use as a clamp or a via including a housing cylinder which sealingly houses a telescoping cylinder. The telescoping cylinder is extended rapidly outward by application of low pressure to hydraulic fluid within the telescoping cylinder. Upon meeting resistance, the extension speed of the telescoping cylinder is slowed down and high presssure is applied.The use of a small diameter force input rod or piston is encompassed by a close fitting input portion of the telescoping piston so that the two pistons move together during a portion of both their force and retraction strokes.

Abstract: In a power braking system for a vehicle a supply of fluid from a power source is utilized to augment the output pressure to be supplied to a brake from a pedal-operated brake control valve assembly. The power source comprises a source of hydraulic fluid of a type different from that which is supplied to the brake from the control valve assembly, and the fluid under pressure from the pressure source is supplied to at least one pressure converter which is adapted to pressurize hydraulic fluid in a sub-system to augment the output pressure from the control valve assembly. The sub-system is provided with hydraulic fluid of a type different from that of the power source, and an hydraulic accumulator is incorporated in a line between the pressure converter and the control valve assembly.

Abstract: A pressure transducer body is described which has a bore running its length and contains (a) a means for receiving a pressure transducer, (b) a fluid reservoir, (c) a stationary elastic plug member having embedded therein a T-shaped rigid pin member, and (d) a chamber for receiving a fluid under pressure. The elements of the transducer body are combined in such a way that pressures of fluids flowing into chamber (d) are accurately measured using conventional pressure transducers even at very high pressures (e.g. 20,000 psi). More importantly, perhaps, the configuration of the transducer body permits accurate pressure measurements on pressurized fluids which are corrosive and/or abrasive. This makes the pressure transducer bodies particularly useful in the oilfield service industries for measuring the pressure of acidizing or hydraulic fracturing fluids used in stimulation.

Abstract: A hydraulic control device including an assembly of two or more pistons connected to move together within the same or different cylinders. The movement of the piston assembly causes each piston to displace corresponding amounts of hydraulic fluid from the associated cylinder, the fluid being used to operate hydraulic units, the latter being operated to the same extent irrespective of the loading thereupon.

Abstract: A force multiplier for a punch press which is sufficiently compact as to be placed in the normal throat opening of such press and yet enables the press to increase its working force by one and one-half to three times. The multiplier has a platen having a large diameter piston on its upper surface which piston has a sleeve on its upper surface, the outer surface of which is in engagement with a cylindrical wall in an upper base plate and the inner surface of which forms a cylinder wall for a second piston of smaller diameter which is engaged by the platen of the punch press.

Abstract: In a mixed medium brake system for a motor vehicle, there is provided a hydro-pneumatic brake cylinder device in a common housing having a compact configuration that is realized by designing the hydraulic piston in the form of a cylindrical plunger having a hollow cavity in the end adjacent the pneumatic piston, whereby engagement of the pneumatic piston push rod with the plunger is at a location thereof forward of the end adjacent the pneumatic piston, thus minimizing the distance required between the pneumatic piston and the hydraulic piston formed by the plunger. Such an arrangement also reduces the binding action of the cylindrical plunger in its guide bore for improved operation, while accommodating pivotal motion of said pneumatic piston.

Abstract: A brake booster consisting of a power cylinder and a hydraulic cylinder in combination and a wear detector for detecting a predetermined extent of wear of a brake lining is disclosed, which comprises the wear detector being formed of a switch operating member provided with a spring at one end and adapted to be moved by the action of a power piston in the power cylinder, a switch to be actuated due to the movement of the switch operating member and means apparatus for exerting a pressure corresponding to the operating pressure of the power piston on the other end of the switch operating member so that the switch operating member can be moved by the action of the power piston through the spring.

Abstract: A fluid power apparatus for converting steam to hydraulic energy having one or more pairs of linear steam and linear hydraulic cylinders arranged symmetrically and with their axis parallel about a steam generator. The rod ends of the cylinders are connected to a wobble plate. Valving directs steam in and out of the steam cylinders and as the steam cylinders reciprocate, the corresponding hydraulic cylinders will be reciprocated generating hydraulic fluid pressure. Valving is accomplished by valving plates rotated by the wobble plate or by means of a slide valve positioned by a wobble plate actuated linkage.

Abstract: A servo booster is provided with a tube coaxial with the booster output rod for relieving the booster housing of braking reaction forces. The housing of a tandem master cylinder has an externally threaded rear end which is threadedly engaged with internal threads formed on a reduced diameter front part of the tube. The retracted position of the primary piston of the master cylinder is determined by abutment with the booster output rod, and this can be adjusted by turning the master cylinder housing relative to the tube.

Abstract: In a boosted hydro-pneumatic drive for rapid traverse and power stroke, particularly for driving punching tools, a cylinder housing (1, 4) with partition (12), a disc piston (7) with plunger (8), a working piston (2) which can be loaded with compressed air for the return stroke and an annular piston (9) surrounding the plunger (8) are provided. The cylinder spaces between the working piston (2) and the annular piston (9) on both sides of the partition (12) are filled with hydraulic oil.In order to reduce the consumption of compressed air and to increase the speed of response, and for the purpose of simplification, the working piston (2) is provided with an annular surface (16a) which can be loaded with compressed air in the direction of advance, and a compression spring (10) is clamped between the disc piston (7) and the annular piston (9). The space accommodating the compression spring (10) is in constant connection with the outside air, preferably via a filter (11).

Abstract: The invention relates to a pneumo-hydraulic booster with rapid-traverse feature, particularly for driving punching tools, with a working piston which executes a rapid-traverse positioning stroke, a power stroke and a return stroke, with at least one further piston, and with chambers which adjoin these pistons and which, according to a program can be connected to a source of compressed air, in which arrangement a first chamber is pressurized during the positioning stroke and the power stroke, a second chamber is pressurized only during the power stroke and a third chamber is pressurized only during the return stroke and all chambers are vented at other times.

Abstract: 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 and rearward positions with the large piston being located in a large cylinder and having a large rearward face in communication with a reservoir for compressed fluid, and with the small piston having a small forward face for delivering the impulse; wherein the stepped piston assembly has an auxiliary piston located between the large piston and the small piston which auxiliary piston is mechanically linked to the large piston and which is reciprocable in an auxiliary cylinder, and wherein there is provided a valve through which fluid can flow from the volume enclosed by the large cylinder forward of the large piston into the volume enclosed by the auxiliary cylinder rearward of the auxiliary piston.

Abstract: A two step pressure intensifier system consisting of three piston-cylinder units in coaxial arrangement, the first unit being a low pressure medium supplied to it to jointly move the pistons of all the units. The initial movement employing the second unit for a moderate pressure increase and the final movement bringing the piston of the third unit into its cylinder for a high pressure increase.

Abstract: The invention relates to master cylinder and actuator assemblies in which a push rod connected to the actuator extends forwardly through a vehicle mounting member and is engageable at its forward end with a piston, there normally being a clearance between the push rod and the piston in their inoperative positions. Such assemblies suffer from the disadvantage that a desired working clearance is difficult to attain due to manufacturing tolerances. Embodiments of the present invention overcome that disadvantage and provide an assembly which includes a lateral projection (10) on the push rod (5), which projection limits rearward movement of the push rod relative to the mounting member (3).

Abstract: A two-stage intensifier system for use in conjunction with a pressure-operable swing clamp or other pressure-operable device for supplying fluid pressure at a relatively low pressure to perform a first operation and thereafter to supply fluid pressure at a higher pressure to perform a second operation.

Abstract: In an injection molding machine of the type comprising an injection cylinder, a feedback circuit for feeding back the oil in the rear chamber of the injection cylinder into the front chamber thereof and a booster cylinder, a pressure oil accumulator is connected to the booster cylinder through a valve for supplying pressurized oil for actuating the booster cylinder. A check valve is connected in parallel with the valve. When water hammer occurs at the end of the injection stroke the check valve opens to absorb the energy of water hammer by the accumulator.

Abstract: An air/hydraulic actuator for a vehicle braking system uses a surface on a push rod to easily and quickly position the push rod with respect to a piston slidable in the base of a hydraulic master cylinder so that with no air pressure the air actuator push rod is just clear of the piston to ensure complete return of this piston.

Abstract: A push rod assembly having a first section and a second section through which an input force is transmitted to an output member. The first section includes a cylindrical member with a bellows attached thereto. The cylindrical member has a bore therein. The second section includes a piston that is attached to a brake pedal by a pivot pin. The piston divides the bore in the cylindrical member into a first chamber and a second chamber. The piston has a passage therethrough that connects the first chamber with the second chamber. A valve located in the passage controls the communication of fluid from the first chamber to the second chamber. A linkage member which extends into the bore in the cylindrical member is connected to a plate with a slot therein. The pivot pin associated with the brake pedal extends through the slot to attach the plate to the brake pedal.

Abstract: An improved master cylinder in which a pair of orifices extend through the cylinder wall and means is provided on the exterior of the cylinder to permit fluid communication therebetween. The orifices are located near the end of the cylinder to permit restricted flow around the piston in the master cylinder when it is near or at the end of its stroke to cause both the master and slave piston to complete their strokes and at substantially the same time. A similar pair of orifices and an exterior communication means at the other end of the cylinder provides for re-phasing during piston movement in the opposite direction.

Abstract: An automatic device for supplying an elastomer or like material for an intion machine comprising an injection cylinder and a piston, wherein the piston is controlled by a hydraulic multiplier device formed by two stages, the first stage being called the downstream stage and the second stage being called the upstream multiplier stage, and wherein the device comprises a sensor for controlling the supplying of the cylinder with material so as to stock said cylinder by an electrically driven tape advance unit, the sensor being brought into play when the piston is moved in the forward direction, a pressure controller for tripping the upstream multiplier stage to multiply the pressure in the injection cylinder, the pressure controller being controlled from a pressure threshold of the fluid supply of the first downstream stage and an end of travel sensor for tripping the return of the first and second stages to make the piston return at the end of the injection.

Abstract: A fluid pressure amplifier for intensifying fluid pressure, the amplifier comprising a housing including a hydraulic fluid reservoir therein. A first chamber includes a slave piston mounted for reciprocation therein and for abutting engagement with a workpiece. A hydraulic fluid path extends intermediate the reservoir and the first chamber and a second chamber lies in the path intermediate the first chamber and the reservoir and includes check means intermediate the first and second chambers. A third chamber includes a fluid intensifier piston having a head end and a tail end, the head end being mounted for reciprocation in the third chamber and the tail end being mounted for reciprocation in the second chamber, the head end of the piston having a larger diameter than the tail end. Gas admittance means admit a pressurized gas to a gas path which lies intermediate the gas admittance means and the reservoir.

Abstract: A sealed tank normally receiving air under pressure is connected with respect to a shuttle valve so that when there is an accidental loss of pressure, the air in the tank moves the valve to a position where the high pressure in the tank is applied to an intensifier piston placing a brake or the like in operation. By using a three-way valve in the main supply line the brake may be cycled at will merely by an appropriate turn of the valve.

Abstract: A brake booster for a vehicle comprises first and second control pistons operated by hydraulic pressure from a master cylinder, and a power piston pneumatically actuated in response to movement of the control pistons to increase braking pressure applied to the wheel brake cylinders of the vehicle. To control the increasing ratio of the braking pressure in accordance with the changes of the vehicle weight, under unloaded condition of the vehicle only the first control piston is operated by the master cylinder pressure to actuate the power piston and under loaded condition of the vehicle the second control piston co-operates with the first control piston by the master cylinder pressure to accelerate the actuation of the power piston.

Abstract: Apparatus and controls are provided for resistance welding one workpiece or body to another. A movable electrode is driven by a cylinder and a piston which are positioned in tandem with a second cylinder and a second piston. The design enables a small pressure applied to the second piston to result in a large force applied by the electrode to the bodies to be welded, with a back-up electrode located on the opposite side of the bodies. Controls for the apparatus enable the force applied by the movable electrode to the bodies to be changed almost instantaneously so that the force applied can be raised and lowered during the actual resistance welding cycle. In some intances, by way of illustration, the pressure is raised while the welding current is on, and, in other instances, the force is decreased and then increased again during the welding cycle.

Abstract: An improved hydraulic brake booster including a booster cylinder and a dual-circuit main cylinder connected together. The brake booster includes a booster piston which defines a storage pressure chamber and the dual-circuit main cylinder includes a double piston which defines a primary pressure chamber. A separating wall is provided which is connected to both the booster cylinder and the dual-circuit main cylinder and separates the storage pressure chamber from the primary pressure chamber.

Abstract: In a mineral mining installation employing a series of shifting rams for advancing a scraper-chain conveyor provided with a guide for a mining machine, a control system is used to provide a succession of small fluid doses to the rams. Control signals, preferably remotely generated, serve to actuate local valves to cause a selected one or group of piston and cylinder metering devices to alternately accept and expel pressure fluid from a working chamber. In this way a pre-determined volume of pressure fluid can be transferred to one or more of the rams to effect the shifting advancement. This volume of pressure fluid is made up from a succession of small fluid doses each a small fraction of the desired shifting distance so that by repeated cycles of the device or devices the ram or rams associated therewith can extend in fine defined increments.

Abstract: A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section and a hydraulic booster section in series, and a master cylinder unit in series with the booster sections. During normal operation the vehicle operator obtains boosted brake actuating pressures from the master cylinder by operation of the hydraulic booster section throughout the normal stroke of both booster sections without operating the vacuum booster section. If additional brake actuating pressure is required after the hydraulic booster has reached its run-out condition, the master cylinder is actuated normally through mechanical force transmitting elements which are parts of the booster sections. If there is no hydraulic pressure available for hydraulic booster operation, the control valves of the booster sections move from the first range of operation which normally controls the hydraulic booster section to a second range of operation which actuates the vacuum booster section.

Abstract: A hydraulic booster unit and system for use in operating hydraulic units, such as work holding hydraulic cylinders, from a compressed air power source is disclosed. The booster includes a unique refill unit that automatically feeds hydraulic fluid from a reservoir to the booster to replace lost fluid during use, and also includes an alerter for giving warning on the onset of a low fluid condition (such as may occur from an exhausted reservoir or excessive leak), and thus protects against excessive leakage as well as the dangers to the work piece and worker inerent in a low fluid condition. The alerter may be a visual unit or a compressed air-operated audible alarm or both.

Abstract: A dual source power brake booster assembly includes an air-vacuum operated booster section and a hydraulic pressure operated booster section in series. The assembly is so arranged that the vacuum booster section is initially actuated to obtain a booster brake operation when the vehicle operator depresses a brake pedal, and the hydraulic booster section is actuated so as to continue the booster brake operation in response to the increased depression on the brake pedal after the vacuum booster reaches its limit or run-out condition. Both of the booster sections have power members or pistons, respectively, which are always actuated as a unit, so that a common reaction mechanism may be provided for both booster sections.

Abstract: A brake force booster installation with a mechanical, pneumatic or hydraulic actuating mechanism acting on a servo- and adjusting-unit, which in turn acts on the master cylinder, with filling devices and with control- and shifting-devices; the filling devices and the actuating mechanism are thereby actuated by movement of the brake pedal lever pivotally connected at two connecting points to the piston rods of an actuating piston and of a filling piston while the filling devices and the actuating devices are so arranged separated from one another and are so connected with the control and shifting devices that the brake pedal lever during its idle path is actuated with one lever ratio by holding fast one piston rod and thereupon the working effect is realized by automatically shifting to a different translation ratio.

Abstract: An operator cylinder comprising, in combination with a hydraulic piston-cylinder unit, an idle transmission piston for supplying to the hydraulic cylinder a pressure of control, and a stress multiplier for supplying when necessary an increased pressure simultaneously excluding the operation of the transmission piston.

Abstract: Dual master cylinders are arranged to apply hydraulic pressure to a single set of vehicle brakes through a double check valve and single brake fluid conduit. A first of the master cylinders is actuated by compressed air in response to manipulation of an operator's service brake control, while the second master cylinder is actuated to a lesser extent by compressed air responsive to an operator's retarder control. A modulatable emergency brake control may independently and simultaneously actuate both master cylinders together with a third master cylinder coupled to separate brakes. Thus, braking capacity remains available if the service brake system or the retarder brake system or both should fail, or if the emergency system should itself fail while either the service system or the retarder system remains functional.

Abstract: A hydraulic transmission is provided between the booster piston and the master cylinder piston which is automatically interrupted if the booster power is not present. In this arrangement, when booster power is not present, a sufficient pressure can be generated with brake pedal effort alone, making use of the full permissible pedal travel.

Abstract: The invention relates to a brake control device including, a pump driven by an engine, a brake pedal actuated by a vehicle driver, wheel brake cylinders, manual operating means operatively connected with the brake pedal, pressure control valve means having a hollow seat member provided with a normally open-passage therein and a valve seat thereon and conrolling the hydraulic fluid to the pump according to the actuation of the manual operating means, flow regulating valve means having a variable orifice and a fixed orifice and supplying the hydraulic fluid to the passage of the pressure control valve means through the fixed orifice, power piston means actuated according to the actuation of the pressure control valve means, and master cylinders operatively connected with the power piston means for supplying the fluid pressure to the wheel brake cylinders.

Abstract: A pneumatic to hydraulic booster having an integral skid control means is disclosed. The skid control means includes a dump chamber and a dump valve, with the dump chamber being integrally formed within the housing of the pneumatic to hydraulic booster. A choke is also mounted between the dump chamber and atmosphere to provide a two-stage controlled dump rate. In operation, a large portion of the pneumatic pressure in the booster is quickly transferred to the dump chamber when a skid is detected. The atmospheric choke allows a further transfer of pressure from the booster at a second, but controlled rate.