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| Number | Title | Issue Date |
| 7171807 | Oil circuitry for two-stage telescoping transmission jack A multi-stage telescoping transmission jack with a high flow, lower pressure air-over-oil pump. ... | 02/06/2007 |
| 7171890 | Telescopic lifting device 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 compri... | 02/06/2007 |
| 7165487 | Cylinder protective apparatus for preventing strange noise Disclosed is a cylinder protective apparatus for preventing strange noise in which an impact damper is fixed to an inner side of a cylinder cover to prevent collision between the cylinder cover and a cylinder or a cylinder guide from occurring, which may be caused b... | 01/23/2007 |
| 7165908 | Arrangement at telescopic lifting beam Two telescopic lifting beams are loaded in their protruded position and are driven from a retracted position to a protruded position. In order to improve the bending strength of the lifting beams, the lifting beams are surrounded by two telescopic tubes, one of the ... | 01/23/2007 |
| 6851349 | Bleederless telescopic cylinder A telescopic cylinder comprised of an outer cylinder, a plurality of decreasing diameter piston/sleeve assemblies concentrically mounted in the outer cylinder for reciprocal axial movement relative thereto, and a plunger assembly concentrically mounted within the in... | 02/08/2005 |
| 6450083 | Telescopic hydraulic hoist A telescoping hydraulic hoist which improves stability and rigidity in the extended position without sacrificing the maximum extension length of the hoist and with fewer machined parts which may be dislodged or damaged in operation. The base member has a ... | 09/17/2002 |
| 6234062 | Telescopic piston A telescopic piston assembly comprises a housing 1 containing an inner component 2, an intermediate component 3 and an outer component 6, all telescopingly interfitted together. The inner component 2 comprises a fluid outlet at one end, the intermediate c... | 05/22/2001 |
| 6065562 | System for imparting compressional and shear waves into the earth A seismic vibrator system for imparting compressional and shear wave vibrations into the earth has an earth contacting base with a vertical post. A tubular hub is slidably received on the post in a piston/cylinder relationship. Spaced apart horizontal top... | 05/23/2000 |
| 5992815 | Height-adjustable column with a transmitting mechanism A height-adjustable column has a stationary tube that receives a height-changing mechanism, such as a pneumatic spring having a cylinder and a rod that are axially movable with respect to one another. A transmitting mechanism includes a movable member tha... | 11/30/1999 |
| 5983778 | Telescopic hydraulic hoist apparatus A telescoping hydraulic hoist formed from a non-corrosive material provides bearings and hydraulic seals about the bottom portion of each intermediate moving stage. The bearings and hydraulic seals are thus always maintained within the hoist and are not e... | 11/16/1999 |
| 5960698 | Hydraulic cylinder A small diameter cylinder 1a and a large diameter cylinder 1b connected to it are formed in a housing, and a stepped piston 8 comprising a large diameter part 8b and small diameter part 8a is inserted in these cylinders. A first pressure chamber 14a is fo... | 10/05/1999 |
| 5953967 | Fluid-operated cylinder-piston unit, and a tool provided therewith A fluid-operated cylinder-piston unit has a cylinder forming an inner space, a piston unit movable in the inner space and including a first piston and a second piston movable relative to one another and each having a displacement area at one end and a for... | 09/21/1999 |
| 5799563 | Piston and cylinder clamping motor A valve spring compressor apparatus for removing and installing valve springs on automotive racing engines includes a valve seat and a compressor pump assembly. The valve seat is placed between the valve spring and the engine housing. The compressor engag... | 09/01/1998 |
| 5694827 | Dump body cushion An apparatus for cushioning a body of a dump vehicle when the body is lowered, including structure defining a fluid passageway between first and second end portions of the structure. The structure is adapted to be disposed in a fluid pressure operated act... | 12/09/1997 |
| 5613418 | Multiple-stage hydraulic cylinder A multiple-stage hydraulic cylinder for shifting loads by exerting different forces over different distances, in which a hollow-piston cylinder is provided with a hollow piston rod. The hollow piston rod accommodates at least one additional long-stroke cy... | 03/25/1997 |
| 5406880 | Heavy equipment jack A double acting hydraulic jack comprising a housing from which at least two pistons extend, each of the pistons being telescopic with respect to one another and with respect to the housing, and a counterbalance valve between adjacent pistons. The counterb... | 04/18/1995 |
| 5400695 | Method and device for locking cylindrical members together The wire lock is provided for holding a stop ring on the outer surface of a cylinder. The stop ring includes a counterbore at one end thereof. The counterbore is positioned above an annular groove in the outer circumference of the cylinder. The wire lock ... | 03/28/1995 |
| 5343797 | Cylinder device A cylinder device which is capable of restraining the total length thereof to a shorter length even when the stroke is made longer, and which thereby provides the compact appearance and layout of, for example, a machine tool, in which the cylinder device ... | 09/06/1994 |
| 5341724 | Pneumatic telescoping cylinder and method A telescoping cylinder has a cylindrical housing (A) carrying a first stage including a central piston (B) opening into a hollow piston rod (C) and at least one succeeding stage including a concentric piston (E) and piston rod (F) having a hollow interior... | 08/30/1994 |
| 5322004 | Telescoping fluid actuator A telescoping fluid actuator assembly including a housing having a plurality of concentrically disposed fluid actuators disposed therein. Each fluid actuator includes a cylindrical housing enclosing a piston and piston rod. Fluid passage means is provided... | 06/21/1994 |
| 5305605 | Hydraulic piston and cylinder unit An hydraulic piston and cylinder unit with a piston rod and first and second cylinders. The piston rod extends into the first cylinder, and the first cylinder extends into the second cylinder. The piston rod is connected to a first piston which divides th... | 04/26/1994 |
| 5263402 | Lift/slider apparatus This invention relates to a displacing apparatus comprising a plurality of concentric tubular members concentrically disposed about a central axial member. These concentric members define a plurality of substantially closed chambers between adjacent conce... | 11/23/1993 |
| 5255591 | Fluid powered indexing apparatus An indexing apparatus (10) having a pair of concentric cylinders (12, 14) with the outer concentric cylinder (12) being fixed against longitudinal movement and the inner cylinder (14) mounted for reciprocal movement relative to the fixed outer cylinder (1... | 10/26/1993 |
| 5247872 | Multi-stage hydraulic actuator A multi-stage hydraulic actuator including a cylinder body having an outer cylinder and an inner cylinder provided in the outer cylinder, first and second pistons inserted in the outer cylinder to independently move and provided with first and second work... | 09/28/1993 |
| 5193431 | Device for operation of a sliding door member A device for operation of a sliding door member, the device being movable between an open position in which the door member is open and a closed position in which the door member is closed. The device includes a pneumatic cylinder having an actuating pist... | 03/16/1993 |
| 5191828 | Telescopic cylinder with increased lateral loading capacity An upstanding telescopic cylinder including piston and cylinder sections is provided and the piston and cylinder sections include large, inner and outer relatively telescopingly engaged guide sleeves with the cylinder guide sleeve disposed outermost. The ... | 03/09/1993 |
| 5152351 | Protective arrangement for a piston rod of a hydraulic cylinder A protective arrangement is described for a piston rod of an excavator hydraulic cylinder is arranged between a vehicle frame and a scraper blade to serve as a working cylinder for lifting and lowering. For protecting the exposed piston rod, a shell-type ... | 10/06/1992 |
| 5127315 | Brake motor subassembly and process for adjusting such a subassembly A brake motor subassembly comprises a control piston (10) having an internal cavity delimited by a base wall (18) and, at the periphery, by a stepped bore (20, 22, 24) and having a mechanical actuating device acting on the control piston via an automatic ... | 07/07/1992 |
| 5084936 | Apparatus for raising and lowering a rotatable platform An apparatus that raises and lowers a rotatable vestibule of the type used in airports to transfer passengers from a terminal building to a passenger loading bridge. A first plurality of telescoping columns are interconnected to and passively follow a sec... | 02/04/1992 |
| 4991493 | Cylinder with two concentric pistons actuated by a pressure medium and extending to three times the length of the cylinder The invention concerns a cylinder-piston combination actuated by a pressure medium, comprising an outstretched cylinder space (1) and a two-part piston assembly (3, 8) movable in opposite directions in the longitudinal direction of the cylinder space (1).... | 02/12/1991 |
| 4976187 | Fast sweep power cylinder for refuse trucks Power fluid from a pump are provided through one power fluid branch conduit to an extend port for activating the smallest cylinder of a multi-stage packing cylinder and fluid is conducted through a second extend branch conduit to a second port which provi... | 12/11/1990 |
| 4936193 | Protective device The present invention provides a protective device for a working member, such as the piston rod of a piston and cylinder actuator, which is arranged at least partly in a receiving member and is able to be moved and more especially slid, along a curved or ... | 06/26/1990 |
| 4852464 | Two-stage telescoping hydraulic cylinder To allow a telescoping cylinder that is ordinarily operated in a fixed sequence to also be operated in a simultaneous mode, the first stage (12) of the cylinder is provided with an end plate (126), the cylindrical gap (114) in the first stage communicates... | 08/01/1989 |
| 4759257 | Power unit particularly for refuse container packer mechanism 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 ... | 07/26/1988 |
| 4745847 | Helical splined rotary actuator Helical splined rotary actuator includes a pair of cylinder housings having inboard ends rotatably mounted in coaxial alignment on opposite ends of a center sleeve member. Contained within the housings are pistons having relatively large diameter helical ... | 05/24/1988 |
| 4744286 | Brake motor subassembly The brake motor subassembly with automatic play compensation limitation by way of a stepped pilot piston (20), comprising a first cylindrical peripheral surface of larger diameter (21) sliding in an inner bore (7) of the control piston (1) and a second cy... | 05/17/1988 |
| 4741246 | Stage selectable telescopic cylinder assembly A multiple stage telescoping cylinder assembly, which provides full stage selection capability without the need for external hoses or reels, comprises a base; an inner cylinder attached at its rearward end to the base and first and second stage cylinders ... | 05/03/1988 |
| 4726281 | Hydraulic cylinder A multistage cylinder having a partial force mode, a full force extended mode, and a full force retracted mode, and having an outer cylinder closed at one end and open at the other, one or more intermediate cylinders located within the outer cylinder, and... | 02/23/1988 |
| 4700623 | Aircraft trash compactor This invention is directed to a trash compactor suitable for use in aircraft and aerospace vehicles. The compactor includes improved hydraulic power and control systems which provide short compaction cycle times and high compaction ratios and which has in... | 10/20/1987 |
| 4691617 | Multi-section sweep cycle compaction cylinder A triple action, multi-segment, telescoping hydraulic ram comprising a plurality of coaxially nested, extensible cylinders adapted to be selectively extended or retracted, and a pair of lower diameter, sweep cycle cylinders adapted to be operated independ... | 09/08/1987 |
