Abstract: An agricultural system including an agricultural baler including a rotary input shaft connectable by way of a baler driveline to a rotatable flywheel; a hydraulic pump for supplying the agricultural baler with hydraulic fluid, the rotatable flywheel being connectable to the hydraulic pump via the driveline. The baler is transferrable between a first state for driving the hydraulic pump by external drive power provided by a corresponding work vehicle, and a second state for driving the hydraulic pump by the rotatable flywheel. The agricultural system further includes a control unit that is configured to: receive input-power-data indicative of a drive power available for driving the hydraulic pump in the first state of the baler; and determine a control-signal for transferring the baler into the second state, if the input-power-data indicates that the available drive power is insufficient for driving the hydraulic pump.

Abstract: A trash compactor includes an enclosure assembly, a press assembly, and a lever assembly. The enclosure assembly includes a tray and an enclosure extending from the bottom end of the tray. Furthermore, the press assembly includes a press member disposed within the enclosure. The press member includes openings that receive rods therethrough. The rods being secured to opposing interior walls of the enclosure allowing the press member to slidably traverse an interior portion of the enclosure. A lever is then engaged with the actuating rod that is configured to be actuated by a user to compact trash placed within the enclosure.

Abstract: A press machine comprises a moveable press ram, an actuator, a first motor system, a second motor system, and a belt system. The moveable press ram holds a tool that forms a part. The actuator linearly moves the moveable press ram by use of a male-female thread mechanism. The actuator includes an actuator sprocket coupled to the male-female thread mechanism. The first motor system produces a high-force linear movement condition to the press ram, and includes a clutch coupled to a first motor and a first motor sprocket coupled to the clutch. The second motor system produces a high-speed linear movement condition to the press ram. The belt system couples the actuator sprocket, the first motor sprocket, and the second motor sprocket. The clutch allows the first motor to partially or fully disengage from rotational movement of the first sprocket when the belt is being driven by the second motor.

Abstract: The present invention relates to a press suitable for forming hot blanks into components. The press of this invention includes a mechanical press, which may be servo-driven, a hydraulically controlled bolster and a stationary bed. The mechanical press is adapted for vertical reciprocal movement towards the stationary bed for hot forming the blanks placed in dies on the stationary bed. The hydraulically controlled bolster is adapted for quenching the hot formed blank placed on the die. The present invention relates also to a method of hot forming or hot stamping blanks using the press of the present invention.

Abstract: A portable air clamp for use during lamination of substrates is provided. The clamp includes a top clamp plate, a bottom clamp plate and at least one flexible, expandable tube within a housing of the clamp. The top clamp plate is adjacent to a top housing and the bottom clamp plate is adjacent to a bottom housing. An expandable tube or bladder may be disposed in the top housing or the bottom housing. The clamp may also include alignment devices and mechanisms for ensuring proper alignment of the substrates during the laminating procedure. The clamp is adapted to provide uniform pressure along the surfaces of the substrates to be laminated.

Abstract: The present invention is a metal can crushing device that includes a plurality of gears, a handle that is integral to the gears, a casing to house the gears, an accommodating open area with a top planar surface and a bottom planar surface that horizontally extend from the casing to receive a can to be crushed, the top planar surface is integral to the gears and controlled by the handle to exert pressure and crush the can and a spring housed within the top planar surface to stretch or condense the accommodating open area to accommodate different sized the cans. The metal can crushing device can also utilize a push button and hydraulic, pneumatic or electric gears.

Abstract: Press driving modules are provided to permit a standardized press design. The presses of a press line are equipped with always identical press driving modules, and the pressing force of the presses is varied only by the adaptation of the number of press driving modules. The press driving modules each contain two driving devices, respectively, that interact parallel or in series and have different characteristic curves. In particular, they have different maximal traveling speeds and different maximal forces. They can also have a different design with respect to their positioning capability and path resolution. This concept permits not only a standardization of presses of different performance classes within a press line but, beyond that, the largely free definition of characteristic path-time curves of the slides, and thereby finally also a freer design of workpieces, particularly of vehicle body parts.

Abstract: The present invention provides for a device for preparing a glued bio-based panel product test-piece suitable for undertaking an internal bond strength test, the device comprising a base 2, and a press plate 3 and an actuator 4 capable of moving the press plate 3 towards the base 2 with a specific pressure, allowing the bonding of at least one plate to the bio-based panel sample.

Abstract: A friction coupling for friction locking of a shaft relative to a hub, comprises a radially deformable inner sleeve, a substantially dimensionally stable outer sleeve and at least one pressure chamber defined by at least the inner sleeve and the outer sleeve. The inner sleeve is arranged to be radially deformed, thereby producing a surface pressure on the shaft, for friction locking of the shaft relative to the hub. Measuring means integrating with the outer sleeve is arranged to measure the strain of the outer sleeve, which strain is an indication of the friction locking. The above-described friction coupling can be used, for instance, in piston assemblies and press tables.

Abstract: A cartridge assembly for connection to a frame of a high temperature, high pressure press, having an anvil at a front end of a cylindrical body of the cartridge and a hydraulic chamber within the body adapted to apply axial pressure to the anvil. A radial compression element is disposed around an outer diameter of the body and is adapted to limit radial expansion of the body proximate the hydraulic chamber.

Abstract: An incremental urging system comprising a container structure including floor, roof, and side wall structures, and closed at a rearward end. A loading aperture is provided in the roof of the container structure for the introduction of compactable material. An incrementing urging structure traverses substantially the length of the container structure from a fully retracted position at the rearward end, to a fully advanced position at a forward or discharge end, with compactable material being ejected through a discharge gate at the forward. The incrementing urging structure is urged into incremental horizontal motion within the container structure by two cooperating mechanical systems.

Abstract: A slide of a press machine is driven by composite thrust of thrust of an electric (servo) motor SM (via a screw/nut mechanism from the electric motor) and thrust of hydraulic cylinders SYL1, SYL2 to which pressure oil is supplied from a constant, high pressure source. A slide control device controls the electric motor SM and the hydraulic cylinders SYL1, SYL2, based on a slide position signal and a motor angular velocity signal, and at the same time, makes the hydraulic cylinder SYL1 work as a pump during a period when slide load is small, charging pressure oil to the constant, high pressure source by using the thrust transferred from the electric motor to the hydraulic cylinder SYL1 through the screw/nut mechanism and the slide.

Abstract: In an overload safety device in a press, having a driving device with a drive shaft, a slide carrying out an oscillating movement and a connecting rod which connects the drive shaft with the slide and has a large and a small eye, the connecting rod is provided with a pressure element disposed displaceably in the longitudinal direction of the connecting rod. The pressure element acts at least indirectly upon a fluid such that, when a certain force acts upon the connecting rod, a pressure increase occurs in the fluid. The fluid is guided to a pressure limiting valve which, when a predetermined pressure is exceeded, causes an interruption of the slide movement.

Abstract: Disclosed is a high-accuracy pressure device for working that has a large pressing force and requires small driving energy. The pressure device comprises: a base plate, a support plate spaced at a prescribed distance from the base plate, a first slider and a second slider; the first slider and the second slider being formed so that the two can move between the base plate and the support plate in a direction orthogonal to the base plate and support plate and are capable of relative movement with each other in that direction, a position sensor for detecting the moving position of the second slider; a first drive means for driving the first slider; a second drive means for driving the second slider; and a central processing unit which controls the first drive means and second drive means and receives and processes position signals from the position sensor.

Abstract: A first embodiment of a drive arrangement for a large rectangular baler includes hydraulic pump and motor sets, and second and third embodiments include only gear and shaft arrangements, for driving the plunger for compressing the crop being baled, and for driving all of the auxiliary functions. In all embodiments, power delivered by a main shaft is divided between an auxiliary function drive shaft and a plunger drive shaft. In the first and second embodiments, a flywheel is located for smoothing the power flow to the plunger drive arrangement, and in the third embodiment the flywheel is located for smoothing power flow to both the plunger drive arrangement and the auxiliary function drive arrangement. In all embodiments, the rotation of the shaft carrying the flywheel due to the inertia of the flywheel is ineffective for driving the plunger and auxiliary function drive arrangements when power to the main drive shaft is cut off.

Abstract: A hemming press that includes a crown and a base plate separated by four corner posts. A press ram is slidably mounted on the posts between the crown and base plate. A first die is mounted to a lower surface of the press ram and a second die is mounted to an upper surface of the base plate. Workpieces to be hemmed are placed in the second die, and the press ram is moved from an upper home position to a lower hem position to perform the hemming process. Pre-hemming and final hemming steps are performed by one continuous stroke of the press ram. A pre-hem pressure is provided to the press ram by at least one electric servomotor and roller screw assembly, and a final hem pressure is provided to the press ram by at least one hydraulic actuator.

Abstract: A pressing machine with fewer breakdowns in a hydraulic pressure compensating device for a pressure-equalizing apparatus for pressure pins is provided.

Abstract: A first embodiment of a drive arrangement for a large rectangular baler includes hydraulic pump and motor sets, and second and third embodiments include only gear and shaft arrangements, for driving the plunger for compressing the crop being baled, and for driving all of the auxiliary functions. In all embodiments, power delivered by a main shaft is divided between an auxiliary function drive shaft and a plunger drive shaft. In the first and second embodiments, a flywheel is located for smoothing the power flow to the plunger drive arrangement, and in the third embodiment the flywheel is located for smoothing power flow to both the plunger drive arrangement and the auxiliary function drive arrangement. In all embodiments, the rotation of the shaft carrying the flywheel due to the inertia of the flywheel is ineffective for driving the plunger and auxiliary function drive arrangements when power to the main drive shaft is cut off.

Abstract: A press for pressing pulverulent materials, in particular metal powder, having an eccentric crank drive, which has at least one connecting rod and a crankshaft and a gearwheel which is connected thereto in a rotationally fixed manner, for driving an upper punch unit. It is possible to drive the gearwheel via at least one worm drive of at least one motor. An electronic control unit is also provided. In this press, the electronic control unit is designed for reversing operation of the crankshaft.

Abstract: A press that includes a push rod (12) that can be pushed downward to cut and mold miniature components, has a small size and a minimum number of components, and can be easily and precisely controlled. The push rod has a largely upwardly-facing shoulder (140) that lies in a chamber that can receive pressured hydraulic fluid to push down the push rod. A piezoelectric actuator, or piezoactor (18), moves a piston (20) that lies in a pressure cylinder. One end of the pressure cylinder holds hydraulic fluid (130), and when the piezoactor pushes the piston it pressurizes the hydraulic fluid therein. Pressured hydraulic fluid in the pressure cylinder flows through a passage (23) to the rod chamber to press down the push rod. The cross-sectional area of the pressure cylinder is many times greater than the cross-sectional area of the push rod shoulder so slight movement of the piezoactor is magnified many times by the hydraulic fluid to move the push rod with a long stroke.

Abstract: A screw press which can ensure the positional precision of the ram when the rotation amount of the press motor does not directly translate into the position of the ram because there is other machinery, such as a decelerator and the like, present between the motor (servo motor) and the screw mechanism, has a construction in which a position detection sensor, which detects the position of the ram, is provided, and the position of the ram is controlled by the output from this sensor.

Abstract: A vehicle for collecting refuse comprising a chassis, a body mounted with the chassis for receiving refuse through an opening thereof, a packer assembly for moving refuse into the body through the opening and for additionally and alternately ejecting refuse, and a gate assembly mounted to serve as a closure for another opening of the body and movable between normal closed and opened positions.

Abstract: An oil filter crusher includes a frame, a threaded drive screw, and a ram assembly, but does not include any actuator for driving the screw. Rather, a first end of the drive screw has a drive head to which a user may couple a conventional wrench, such as a pneumatic impact wrench of the type commonly used in automotive service centers. A thrust bearing assembly couples the second end of the drive screw to the ram assembly. A threaded portion of the drive screw engages a threaded opening in a portion of the frame. The ram assembly thus moves in an axial direction in response to rotation of the drive screw with respect to the frame. Rotating the drive screw in one direction moves it toward the filter to be crushed, and rotating it in the opposite direction moves it away from the filter.

Abstract: A rubbish container with automatic compressing mechanism mainly including a housing, a plurality of rubbish bins positioned inside the housing to collect sorted rubbish, movement control channels provided in the housing to support a transversely extended top board, and an automatic compressing mechanism mounted on the top board. A motor is connected to one end of one of the movement control channels to rotate a threaded rod therein, so that the top board connected to the threaded rod and the compressing mechanism on the top board are brought to translate along the movement control channels to and fro in the housing over the rubbish bins. The compressing mechanism has a motor to drive a compressing member and a compressing plate connected to a lower end of the compressing member to move up and down, compressing rubbish collected in the rubbish bins to a reduced volume.

Abstract: The present invention describes an apparatus for achieving power amplification in general press and elevating systems with enhanced control and without the disadvantages of the pneumatic and angle-linked devices. A motor is coupled to a screw and nut for delivering force to at least one transfer piston within a fixed volume at the base of a larger piston. Amplification of power is attained when transfer piston displaces the fluid within the fixed volume. A pressure sensor in the fixed volume and coupled to the motor provides the closed loop feedback required of the control of power amplification. The change in force exerted by the transfer piston has linear relationship with the change in power output of the larger piston.

Abstract: A hydraulic press of the type having at least one hydraulic pump driven by a rotary shaft and a hydraulically operable ram is provided with an improvement comprising a flywheel connected to the pump shaft. According to another aspect, the ram is reciprocated between retracted and extended positions by rotating the pump shaft and the flywheel at a predetermined rotational speed so as to operate the pump(s) and deliver fluid to the hydraulically operable ram.

Abstract: A pressure adjustment mechanism for a top side cooker head includes an adjustable element secured to the top side cooker head arm. In one embodiment the element is adjustable in discrete one-half turn increments of a screw and in another embodiment is continuously adjustable. Both embodiments change the moment arm of a pneumatic cylinder ram that applies a counterbalance force to the cooker head. The invention permits adjustment of the force applied to foodstuffs on the griddle surface from 0 to the weight of the cooker head.

Abstract: A refuse packer includes a paddle (14) which oscillates horizontally about axis (19) through about 200.degree. to sweep refuse into a storage chamber of a vehicle (not shown). The paddle has an actuating assembly (26) supported by a single housing (27) secured to a vehicle chassis. The actuating assembly has a drive shaft with a hexagonal end clamped in a hexagonal opening (21) of the paddle. The drive shaft also has a pinion engaged by a pair of opposed toothed racks which slide in respective hydraulic cylinders (35, 36, 37, 38) which act to oscillate the shaft and paddle. A pair of hydraulic resistance cylinders (40) oppose side loads set up by the engagement of the racks with the pinion. In former arrangements the paddle was coupled to a crank plate moved by hydraulic rams which swung as they reciprocated. This led to uneven torque on the paddle and a tendency to stall midstroke, whereas the present drive provides even torque, throughout the oscillations.

Abstract: A method of closing a mold and a press therefore, whereby a first mold part is moved towards a second mold part by a first relatively large displacement via a mechanical non-fluid drive. The mold parts are then pressed against one another by a fluid system including a pneumatically driven hydraulic system to provide relative high mold pressures. Drive and follower pins are selectively coupled to the hydraulic system by a carousel for selectively coupling a mold part to the hydraulic system during the pressing portion of the cycle. The method and press are particularly suitable for encapsulating electrical components.

Abstract: A differential pressure machine for differentially pressure forming an article in a sheet of thermoplastic material including a frame, upper and lower platens movable on the frame between spread and less spread positions. Mechanism is provided for moving the platens between the spread and less spread positions for releasably locking the platens in the less spread positions. Upper and lower, opposed differential pressure molds mounted on the upper and lower platens, respectively, for movement therewith between open positions and closed positions for engaging opposite sides of a thermoplastic sheet of material and differentially pressure forming an article therein.

Abstract: The present invention relates to a ram actuating mechanism in a press for terminating wires, or the like. The actuating mechanism imparts movement to the ram in two distinct portions. An air cylinder or other low pressure linear actuator is utilized to effect the relatively long stroke of the first portion of movement. The second portion of movement, which must overcome relatively high insertion forces but over a relatively short distance is effected by a cam and cam follower arrangement. This permits sufficient clearance between the terminating punch and die when the ram is retracted to pass other wire handling mechanisms while at the same time providing a relatively compact mechanism.

Abstract: An hydraulic press having a fixed tool carrier, a movable tool carrier, and a first rotatable shaft for generating movement of the movable tool carrier towards and away from the fixed tool carrier. The first shaft has its axis aligned with the direction of the movement of movable tool carrier, and a second rotatable shaft extends transverse to said first rotatable shaft, there being a drive transmission coupling said first and second shafts. An angularly movable, manual operating lever has, a centering device urging said lever to a central, rest position from which said lever is movable manually in opposite angular directions, and, there is provided a coupling mechanism for coupling said lever to said second shaft during angular movement of the lever in either direction from said central, rest position, said shaft being rotatable relative to said lever in said central, rest position.

Abstract: A conveyor belt clamp is made up of a pair of parallel plates which hold a belt between them. Tension is applied by a tensioning bar which is fixed across arms attached to and projecting outwardly from each plate. A hydraulic ram applies the tension and the plates bow centrally towards the belt to give an even distribution of pressure across its width.

Abstract: A machine for manufacture of products formed by welding of plastic film sheets is disclosed comprising a welding station, a cutting station, and a conveying apparatus which serves to guide the plastic sheets through the stations. The conveying apparatus consists of a moving carriage with grasping devices for grasping the plastic sheets. The carriage comprises a cam slot extending perpendicular to its direction of motion. A driven cam follower engaged in the cam slot drives the carriage from a first position, in which the grasping devices grasp the sheets, into a second position at the end of the feed carriage travel, at which the sheets are released. A conveyor belt supports the film sheets between the various stations. A lift mechanism activates the welding press during the reverse motion of the carriage; it is driven by the drive shaft driving the crank arm. The speed of the motor driving the drive shaft may be varied during each machine cycle to optimize its operation.

Abstract: A clamping device for conveyor belts has a pair of crossbars disposed on opposite sides of the conveyor belt and clamping bars each disposed between a respective crossbar and the conveyor belt. The device is mounted through the clamping bars and a hydraulic unit such as deformable hoses or an array of piston-and-cylinder units is braced between one of the clamping bars and the respective crossbar.

Abstract: A belt press is formed of a longitudinal row of upright and abutting press frames each comprising a plurality of upper and a plurality of lower traverses respectively having lower and upper traverse faces, upper and lower press platens carried on and between the traverses and having respective upper and lower platen faces respectively confronting the lower and upper traverse faces, and mechanical actuators including bolts engaged between the traverses for displacing the traverses toward each other and thereby pressing the platens against a belt engaged therebetween with a pressure sufficient to deform the lower traverse. A lower bend-compensating element having a pair of nonparallel upper and lower surfaces is engaged between the lower platen face and the respective confronting traverse face. A hydraulic force-transmitter is engaged between the upper platen face and the lower traverse face.

Abstract: A hot press capable of minimizing a displacement of one substrate from another in multilayer printed circuit boards each constituted by a plurality of substrates having wiring pattern groups printed thereon which are pressed together by applying pressure into a multilayer printed circuit board. The end is attained by minimizing a variation in thickness from a central portion of the board to a peripheral portion thereof. The hot press includes plate thickness adjusting devices each interposed between each bolster and each heat insulating member to compress and deform the heat insulating members beforehand.

Abstract: A belt press is formed of a longitudinal row of upright and abutting press frames each comprising upper and lower traverses respectively having lower and upper traverse faces and two upright tie bolts extending vertically between the upper and lower traverses and securing the lower traverse to the upper traverse. Upper and lower press platens carried on and between the traverses have respective upper and lower platen faces respectively confronting the lower and upper traverse faces. A belt workpiece to be joined or repaired is engaged between the platens. Respective upper and lower pressure plates engaged between the platen faces and the respective traverse faces have respective upper and lower heaters. Hydraulic actuators engaged between the upper traverse and the upper pressure plate are vertically expansible for displacing the upper pressure plate down and thereby pressing the platens against a belt engaged therebetween.

Abstract: In the manufacture of packing containers of the non-returnable type for, e.g., milk, the forming and closing of the ridgelike top of the filled packing container represents the final phase in the manufacture. The top is provided with sealing panels which are intended jointly to form a top fin on the closed packing container. The present invention relates to an arrangement for the processing of a packing container by compressing and sealing the top fin of the container. The arrangement includes two processing jaws which are movably suspended in spring elements and are movable symmetrically between an active position wherein the jaws contact the sealing fin and an inactive position wherein the jaws are spaced from the sealing fin.

Abstract: A belt press has a plurality of upper and a plurality of lower traverses respectively having lower and upper traverse faces, upper and lower press platens carried on and between these traverses and having respective upper and lower platen faces respectively confronting the lower and upper traverse faces, and mechanically actuated bolts engaged between the traverses for displacing them toward each other and thereby pressing the platens against a belt engaged between them. The belt press also has at least one bend-compensating element having a pair of nonparallel upper and lower surfaces and engaged between one of the platen faces and the confronting traverse faces, and a hydraulic force transmitter engaged between this bend-compensating element and one of the respective press and platen faces.

Abstract: A belt press comprises a plurality of upper and a plurality of lower traverses respectively having lower and upper traverse faces, upper and lower press platens carried on and between these traverses and having respective upper and lower platen faces respectively confronting the lower and upper traverse faces, and a hydraulic actuator for displacing these traverses toward each other and thereby pressing the platens against a belt engaged therebetween. The hydraulic actuator is engaged between one of the platen faces and the confronting traverse face and has a pressure plate bearing on the one platen face, a plurality of diametrally compressible but circumferentially unstretchable hydraulic hoses forming at least one substantially closed chamber and bearing in one direction in surface contact on the pressure plate and in the opposite direction in surface contact at least indirectly on the confronting traverse face, and a system for pressurizing this chamber.

Abstract: A belt press has at least one upper and at least one lower traverse respectively having lower and upper traverse faces, connectors extending vertically between the upper and lower traverses and securing the lower traverse to the upper traverse, upper and lower press platens carried on and between the traverses and having respective upper and lower platen faces respectively confronting the lower and upper traverse faces, and a hydraulic actuator for displacing the platens toward each other and thereby pressing the platens against a belt engaged therebetween. At least one of the traverses is formed of box section.

Abstract: A machine tool comprising a portal stand having a number of, preferably four, screw pillars and a moveable yoke driven and guided along the screw pillars by means of nuts preferably roller nuts, in the yoke. Tools, machining devices or the like can be attached to the yoke. The nuts are driven simultaneously by a drive motor through a drive shaft extending therefrom. A very good parallel guiding of the yoke is achieved despite uneven loads. When the power demand is high, for example during heavy pressings, an auxiliary cylinder is provided, the piston rod of which is fixed to the yoke.

Abstract: The ram of a hot-stamping press is driven by means of a movable rack that can be allowed to change position with respect to the ram. The rack engages gears on the end of the ram opposite its head, but during the initial portion of its stroke an air cylinder interior to the ram prevents relative motion between the movable rack and the ram. As a consequence, the ram moves at the same velocity as that of the rack during the initial portion of the stroke. Stationary racks are also provided, and additional gears mechanically linked to the gears engaged by the movable rack begin to engage the stationary rack toward the end of the stroke. This requires relative motion of the movable rack relative to the ram despite the force applied by the air cylinder inside the ram, and the velocity of the ram is thereby reduced to a fraction of that of the rack. This results in force multiplication toward the end of the ram stroke.

Abstract: An improved can crusher has two movable jaws, a first jaw and a second jaw, both movably mounted in a support housing. The jaws are initially spaced apart one from the other a distance sufficient to allow a can to be inserted between them. A member capable of generating a mechanical force is mounted on the housing and is directly connected by a connecting member to the second of the movable jaws by a force transferring member and is indirectly connected by the same connecting member to the first jaw by a force modifying member. The force modifying member modifies the mechanical force so generated to achieve a mechanical advantage. When the member capable of generating the mechanical force is activated this force is first transferred to the first jaw, and because of the mechanical advantage achieved, the first jaw is able to initially overcome the structural resistance of the can and crimp it.

Abstract: A fluid piston actuated press is provided with a fixed portion, such as a die, and a plurality of movable portions, such as punches, which move reciprocally along paths which intersect the fixed portion. A plurality of levers, actuated by an actuating means, engage the movable portions to cause them to move along their paths intersecting the fixed portion.

Abstract: The drive of a hydraulic screw press comprises a power cylinder connected with the press slide by its movable member. The chamber of the power cylinder communicates with a pneudraulic accumulator provided with a device for its charging. The device comprises a pneudraulic cylinder with a distributor for communicating its under-piston hydraulic chamber alternately with the source of pressure and a low-pressure hydraulic line, and nonreturn valves for communicating the above-piston pneumatic chamber of the pneudraulic cylinder alternately with the pneumatic line and the pneumatic chamber of the pneudraulic accumulator. This ensures self-sufficiency of the drive of each hydraulic screw press, and the required pressure of gas in the pneudraulic accumulator with a comparatively simple design of the device for charging its pneumatic chamber.

Abstract: A hydraulic press arrangement which includes at least one top cross beam and one bottom cross beam with a press ram, displaceable by means of two cylinder-piston units supplied by at least one pressure medium source, being disposed between the top and bottom cross beams. Each cylinder-piston unit includes a cylinder arranged in the bottom cross beam and in the top cross beam with a piston being guided in each of the cylinders. Two pistons of a mutually associated cylinder-piston unit are connected by way of a piston rod to the press ram. With the arrangement of the cylinder-piston units as well as the controlling of the impingement and venting of cylinder chambers, a relaxation of forces acting on the press frame, due to a subsiding of forces acting in the press working space, is prevented.

Abstract: A stack-forming machine has a telescoping container defined by a vertically reciprocable, downwardly concave press that is received within an upwardly concave lower section that remains stationary during reciprocation of the press. When the press is raised and an upper door on the press and a lower gate on the lower section are opened, the stack may be discharged from the container. The upper door is normally held closed by an overlapping portion of the lower gate, the latter in turn being releasably latched in place, and while the lower gate is swung downwardly by gravity to its opened position as the press is raised, the upper door is powered to its open position through linkage that interconnects the door with the lower section of the container so as to utilize the upward movement of the press as the source of opening power for the door.

Abstract: A press arrangement which includes a press ram selectively displaceable in a working stroke direction by at least one hydraulically actuated, double-acting cylinder piston unit with an auxiliary drive arrangement being provided for displacing the press ram in an idle stroke preceding a working stroke. The auxiliary drive arrangement bypasses the at least one cylinder piston unit and acts on the press ram. The auxiliary drive arrangement may be constructed as a toothed rack-and-pinion arrangement, a linearly double-acting pressure medium drive, or may include an electric linear motor acting on the press ram.