Abstract: A device for pumping a flowable mass, such as a consumable item, has a main body with a hollow space that is fluidically connected with a mass source through an inlet opening and with a mass destination through an outlet opening in the surroundings of the main body. The inlet opening and the outlet opening are disposed along a direction at a distance from each other on the main body. A first body and a second body can each be moved in the hollow space relative to the main body and relative to each other along the direction. The first and second bodies are sealed against an inside wall and slidable on the inside wall to define a chamber. Moving the first body and/or the second body varies the volume of the chamber and its position relative to be main body.

Abstract: The present invention provides a telescopic hoist comprising a series of telescopically arranged tubular sections wherein the tubular sections are made in nitrided steel.

Abstract: The invention relates to a telescopic lifting column. The lifting column comprises a plurality of tube bodies which are arranged concentrically inside one another and are axially movable in each case with respect to each other. Furthermore, the lifting column comprises a hydraulic actuator unit which is arranged in the tube bodies so as to be operating in the axial direction. The hydraulic actuator unit comprises a first hydraulic cylinder-piston unit and a second hydraulic cylinder-piston unit connected with the first, the first cylinder-piston unit being connected to a first end of the telescopic lifting column and the second cylinder-piston unit being connected to a second end of the telescopic lifting column. The first cylinder-piston unit is of the type having a first variable operating chamber and a second variable operating chamber.

Abstract: Hydraulic cylinder for telescopic arms, especially crane arms, consisting of a sleeve (1) closed by means of end covers (2) and (3); an internal piston (4) delimiting expansion (5) and retraction (6) chambers, a tubular shank (16) associated to the piston which protrudes through the cover (3) and which is closed by a head (17) which is provided with a pilot piston (21). Inside the tubular shank (16) runs a tube (18) which may be partially moved by the action of the piston (21). The inlet mouth of the cover (2) has a conduit (11) with a bushing (14), which moves when pushed by the tube (18). The conduit (11) and the tube (18) have orifices (13′) in their wall.

Abstract: The double telescopic prop comprises an outer cylindrical casing tube 1, an inner tube 2 which is displaceable therein and a piston rod 3 which can be extended therefrom. The hydraulic fluid for extending the two prop stages is conveyed through a connection 14 to the piston 5 of the inner tube 2 and is conveyed via a bottom valve to the piston 7 of the piston rod 3. The prop is retracted if hydraulic fluid flows via the connection 17 into the outer annulus 11 between the cylindrical casing tube 1 and the inner tube 2. A size ratio of 8.8:1 at most, which is favourable for the retraction of the prop, exists between the area of the inner tube 2 and the ring area of the annulus 11.

Abstract: 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. When such a condition exists, the probe closely interfits with the piston and has a radial port communicating with the underside of the piston. The probe connects at the bottom with a supply and exhaust passage which also communicates with the underside of the piston via a check valve controlled secondary passage.

Abstract: A telescopic mast has a top mounting assembly which plugs into the top cylinder of the mast and presents an upwardly projecting threaded stud. A platform unit is seated on the mounting assembly and includes a wing nut which is screwed onto the stud and can be turned independently of the rest of the platform unit. The nut is exposed in a recess at the top of the platform unit for access to permit manual turning.

Abstract: Described herein is an internal mixer of the type including a mixing chamber rotatably accommodating mixing rotors therein, a hopper frame erected on the mixing chamber, a charge hopper provided on one lateral side of the hopper frame for charging a mixing material therethrough, and a floating weight provided in the hopper frame for upward and downward movements therein, the floating weight being held in an upper lifted position when charging a mixing material into the mixing chamber and then lowered into a pressing position in a mixing stage to apply pressure on the charged material in the mixing chamber, wherein the floating weight is dimensioned to have an axial length sufficient for closing an inlet opening formed in the side wall of the hopper frame in communication with the charge hopper, when in the lower pressing position, and lift means for lifting the floating weight up and down in the hopper frame is provided separately from a pressing means with a function of pressing the floating weight resilient

Abstract: The hydraulic elevator system includes a synchronized telescoping cylinder with inner and outer reciprocating plungers mounted in a fixed cylinder. An hydraulic fluid pressure intensifier is connected to the pressure chamber for the outer plunger, and to the pressure chamber for the inner plunger. Solenoid valves control the flow of hydraulic fluid between the pressure intensifier and the two plunger pressure chambers. Switches mounted on the outer plunger control operation of the solenoid valves. When the inner plunger is too low relative to the outer plunger, when the elevator reaches the bottom landing, the pressure intensifier will raise the pressure in the inner plunger pressure chamber to appropriately lift the inner plunger. When the inner plunger is too high relative to the outer plunger, when the elevator reaches the bottom landing, the pressure intensifier will lower the pressure in the inner plunger pressure chamber, thus lowering the inner plunger.

Abstract: A fluid operable power unit which is particularly adapted for movement of a compaction head in a refuse container. However, the power unit is also useful in other types of mechanism.The power unit comprises a plurality of telescopically movable cylinders and pistons. Fluid pressure is applied for movement of the first cylinder. Then increased fluid pressure is applied for movement of the second cylinder. As the first cylinder ceases to move, fluid pressure increases and automatically operable valve means traps the fluid which has moved the first cylinder. Then increased fluid pressure moves the second piston and second cylinder. As the second piston and the second cylinder move under the influence of increased fluid pressure, the fluid which is trapped is increased in pressure.Thus, high pressure forces act to move an actuator member for compaction or for any other purpose.

Abstract: A telescopic device for use in a crane jib, forklift truck, lighting tower, access platform or the like, having at least two extandable sections extending from a base section, in which each said extendable section is extended by a piston and cylinder assembly and in which, to extend the device, a similar hydraulic pressure is applied in the extension mode to all the assemblies and different hydraulic pressures are caused to exist in all the assemblies in the retraction mode, so that a selective extension sequence of the sections is effected.

Abstract: A hoseless arrangement for supplying pressure and tank passages in remote hydraulic device including an extend tube, with pressure and tank passages, and an extend cylinder each reciprocably mounted on a base with a pair of concentric tubes attached to the extend cylinder and to the extend tube, the inner tube communicating with one side of the extend cylinder and the outer tube with the other side thereof. A shuttle valve on the extend tube is connected to shift so that the pressure passage is always subjected to high pressure and the tank passage is always subjected to low pressure.

Abstract: A telescopic prop for use in mine workings extends and retracts over three stages. The prop has an outer main base member 1 with respective first, second and third concentric inner members 2, 3, 4 disposed one within another. The first inner member has a piston 6 in which is arranged a non-return valve 23 which normally shuts off communication between a working chamber 20 associated with the first and base members and the working chambers 22, 27, 29 pertaining to the other members. A plunger 24 is provided to open the non-return valve when the first inner member is nearly fully retracted inside the base member so that after retraction of this stage the other stages can be retracted. The second or intermediate member also employs a piston 9 which is connected via a rod 13 with an auxiliary piston 15 disposed in a working chamber associated with the uppermost third member.

Abstract: The telescopically extendable prop (1) has at the periphery of the intermediate prop (3) abutments (30) which cooperate with a valve (15) before the intermediate prop (3) has attained its highest extended position. The valve (15) stops the extending stroke of the intermediate prop (3) and is releasing the beginning of the extending stroke of the top prop (4). As soon as a predetermined pressure is built up in the consolidating conduit (10) of the top prop (4), the valve (27) subjected to this pressure is overacting the valve (15) cooperating with the abutments (30) of the intermediate prop (3), whereupon the consolidating stroke is completed by pressurizing the intermediate prop (3) with pressurizing fluid. (FIG.

Abstract: A fluid pressure actuated piston of an aircraft multiple disc brake assembly is adapted to have an extended stroke by telescoping with a pressure actuated cylinder. The piston is slidably carried in a fluid pressure actuated cylinder which, in turn, is slidably carried in a fixed carrier. Initially, only the piston moves axially to extend its stroke with respect to the carrier. The cylinder's structure and axial position with respect to the carrier creates a fluid pressure responsive surface area initially sealed from the effects of the fluid pressure. Axial movement of the cylinder is initially resisted by either mechanical or differential pressure member until the stroke of the piston reaches a predetermined axial position to engage the cylinder. Continued extension of the piston's stroke urges the cylinder axially to break the fluid seal and expose the heretofore unaffected surface area of the cylinder to fluid pressure thereby extending the stroke of the cylinder a predetermined axial distance.

Abstract: A telescoping hydraulic cylinder apparatus for elevator application, wherein telescoping cylinders and a piston rod extend or retract simultaneously, having a compensator pump for automatically replenishing fluid lost due to leakage from the upper cylinders of the apparatus.

Abstract: A three-stage, four-section telescopic ram employing a plurality of internal fluid passages, with valving provided in certain of these passages, to produce a uniform overall extension speed when pressure fluid is supplied to the ram at a substantially constant rate.

Abstract: Automated control apparatus for an intermittently extended hydraulic cylinder is disclosed which governs cylinder elongation such that the rate of elongation is essentially constant with respect to time. The control apparatus includes a preset continuously variable timer that regulates the timer interval between sequential length increments of the cylinder. The control apparatus also includes a second timer which is responsive to the timer interval interposed by the first timer and which operates a valve controlling communication of hydraulic fluid between a hydraulic cylinder and a pump. The second timer may be discretely variable so that one of a plurality of predetermined length increments can be selected. Alternatively, the second timer may adjust the time period during which the valve is opened such that successive stages of a telescopic hydraulic cylinder have equal length increments.

Abstract: A telescopic fluid ram or thruster utilizing pressurized gas and having an inner and outer piston that slides within a cylindrical bore including a central probe which is tapered and extends into the bore of the inner piston where it will cause the inner piston to move under high pressure while the gas escaping from around the tapered area produces a holding force to hold the outer piston in place until the inner piston is fully extended, at which time the outer piston will extend under a reduced pressure.

Abstract: Apparatus for automatically sensing when an insufficient amount of fluid exists in a closed fluid power transmission system of a telescoping piston type hydraulic elevator system and circuitry shown interconnected with the control system of a typical hydraulic control system for automatically initiating a fluid restoration cycle to restore fluid to that closed fluid power transmission system to enable the system to operate in a desired manner.

Abstract: A single-acting, three-stage, four-section telescopic ram for use in conjunction with a triple-lift type mast in a lift truck. The ram features an extremely low overall length when fully contracted, thus affording good operator visibility. The ram also is capable of producing surprisingly "high-lift" despite its low contracted profile. Further, the ram features an internal construction that produces constant lifting and lowering speeds for a load, as well as providing for positive control over the sequence of movements of parts in and on an associated mast.

Abstract: A three-stage hydraulically-operated telescopic prop is disclosed having working chambers which can be charged with hydraulic pressure fluid to extend a central prop member relative to an outer prop member and an inner prop member relative to the central member. A pressure-operated spring biased non-return valve is operated by pressure to open communication between the working chambers to extend the inner member once the central member has been fully extended. The valve is also operated mechanically to open communication between the working chambers to allow retraction of the inner member when the central member has been retracted to a certain extent. Further chambers are provided between the central and outer member, and between the central and inner member, and these chambers can be charged with hydraulic pressure fluid to retract the central member relative to the outer member and the inner member relative to the central member.

Abstract: A multiple stage hydraulic telescopic cylinder device includes two hollow pistons one movable within the other with a cylinder in which the outer piston moves. In the bottom part of the outer piston are two passages leading to the interior of the inner piston, one below and ther other above the piston area of the inner piston. Fluid under pressure is supplied to the interior of the cylinder below the outer piston, to lift it. This fluid is confined to the interior of the cylinder below the outer piston until the outer piston reaches its outmost position, whereupon a by-pass passage in the wall of the cylinder connects the interior of the cylinder to the passage in the bottom part of the outer cylinder which leads into the space of the inner cylinder below the piston portion thereof. The inner piston is then pushed out to its outer-most position.