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| Number | Title | Issue Date |
| 8100387 | Combination oil/gas-operated spring with expansion vessel A combination oil/gas spring includes a first hollow casing, a piston capable of fluid-tightly sliding within the casing, a rod connected rigidly with an end portion thereof to a central portion of the piston, a first chamber containing an actuating rod provided ins... | 01/24/2012 |
| 7472897 | Cushion and cushion cylinder for ram or bolster of a press A high-pressure, inert gas cushion assembly for the ram or bolster of a metal stamping press includes a manifold having fluid-flow passages defined therein, along with a plurality of cylinder mounting locations each in communication with at least one of the fluid-fl... | 01/06/2009 |
| 7287409 | Die cushion device A die cushion device is comprised of die cushion modules which are independently movable and unitized. The individual die cushion modules are provided with a cushion pad, a servomotor, a power transmission mechanism, a power conversion mechanism and a guide member. ... | 10/30/2007 |
| 7270318 | Device at an energy accumulating piston-cylinder tool The present invention relates to an arrangement in an energy-accumulating piston-cylinder device (1, 2) having a piston (2) and a cylindrical casing (1). The invention is characterized by an openable safety valve (1) arranged in the pisto... | 09/18/2007 |
| 7260971 | Apparatus for locking a sheet of metal suitable to be shaped in a press An apparatus for locking a sheet of metal to be shaped in a press, comprising at least one fluid-operated actuator for translational motion of a first sheet presser, adapted to support, in an initial operation step a sheet of metal to be shaped, arranged above a fir... | 08/28/2007 |
| 7243521 | Cushion pin, wear plate, load supporting device, die cushion, press machine and pressing method An elastic member is disposed on a load supporting device such as cushion pins and wear plates, which are placed between at least a workpiece and a die cushion pad and transfer a load applied to the work to the die cushion pad, to support the load. The load supporti... | 07/17/2007 |
| 7222702 | Gas spring A gas spring (7) comprises a cylinder main body (20); a rod member (21) slidable to cylinder main body; a gas filled chamber (23) filled with compressed gas and urging the rod member in a first direction; a rod inserting hole (32) ... | 05/29/2007 |
| 7197910 | Die cushion apparatus of a press machine and surge pressure reduction method for a die cushion apparatus In a die cushion apparatus, a pressurizing force acting on a die cushion pad is applied to a first piston of a hydraulic cylinder unit by the operation of a slide, the first piston slides inside a first cylinder and pressure oil in a first hydraulic chamber is press... | 04/03/2007 |
| 7171882 | Knife-like cutting die A knife-like die for cutting a thermoformed plastic article from a sheet of thermoformable plastic. The die includes a die build up plate that is mounted to a first platen and a striker plate that is mounted to a second platen. The die further includes a die board h... | 02/06/2007 |
| 7172200 | Sealing arrangement on piston rods A sealing arrangement on piston rods with a rod guided in a cylindrical compressed-gas space, particularly on piston rods of high-pressure pneumatic springs or gas-filled shock absorbers, with at least one seal disposed on the piston rod for sealing the compressed-g... | 02/06/2007 |
| 7150450 | Vehicle suspension damper with integral height leveling valve An air spring suspension damper assembly includes a first housing and a second housing which telescope relative to each other. An actuating member such as a cable is connected to a height leveling valve contained in one of the housings and attached to the other hous... | 12/19/2006 |
| 7121538 | Arrangement at a press tool for breaking the piston/piston rod of a gas spring The invention relates to an arrangement in a pressing tool for braking the return movement of pistons/piston rods (D1) of gas-filled springs (D) and thereby also of a sheet metal holder (B) supported thereon after pressing has been performed. The invention is... | 10/17/2006 |
| 7083164 | Cushion and cushion cylinder for ram or bolster of a press A high-pressure, inert gas cushion assembly for the ram or bolster of a metal stamping press includes a manifold having fluid-flow passages defined therein, along with a plurality of cylinder mounting locations each in communication with at least one of the fluid-fl... | 08/01/2006 |
| 7070028 | Frequency dependent damper A gas shock absorber has a pressure tube which defines a working chamber. A piston divides the working chamber into an upper working chamber and a lower working chamber. A flow path extends through the piston to provide fluid communication between the upper and lowe... | 07/04/2006 |
| 7066957 | Device and assembly for intervertebral stabilization The invention concerns a staiblizing device (150) designed to link two vertebrae, comprising at least two chambers (156, 158, 186, 188) arranged proximate to said vertebrae, said chambers containing a shock absorbing fluid. Means (192, 194) are ... | 06/27/2006 |
| 6971303 | Method and device at a piston-cylinder device A method and an arrangement in an energy-accumulating piston-cylinder arrangement (A) has a piston/piston rod part (2), guide/end (3) and tubular casing (1). The casing (1) is provided with a fracture or sprain mark (7) in order to... | 12/06/2005 |
| 6941789 | Die cushion device After molding is started, a large reaction force is obtained by compressing the air within a lower chamber by a piston while maintained in a sealing state. At an intermediate time of the molding, a small reaction force is obtained by communicating the upper and lowe... | 09/13/2005 |
| 6915879 | Main shaft balancing device for machine tool A gas spring comprising a cylinder body filled with compressed gas and an upright rod passing through a rod side end wall member of the cylinder body. By supporting a main shaft unit with the gas spring, the load on a vertical displacement mechanism is reduced. A pa... | 07/12/2005 |
| 6904681 | Method for fabricating a driving and locking mechanism The present invention is a method for fabricating a driving and locking mechanism. The present invention provides a bearing device having a first end and a second end, where the first end has a curvilinear shape. The present invention also provides a strip of metal ... | 06/14/2005 |
| 6901689 | Firearm pneumatic counter-recoil modulator and airgun thrust-adjustor An inexpensive generally retrofitable drop-in cartridge-unit of light-weight pneumatic-cylinder design for replacing the conventional metal/compression-spring member housed within the frame of a gun, thereby providing significantly smoother, quiter, more rapid, and ... | 06/07/2005 |
| 6749185 | Cushion assembly and method A cushion assembly includes a lower end wall which is at least partially enclosed by a tubular cylindrical outer wall. An upper end wall is also partially enclosed by the outer wall. A tubular cylindrical inner wall extends between recesses in the lower end wall and... | 06/15/2004 |
| 6729173 | Hydraulic draw press arrangement A hydraulic drawing system for a press is provided for controlling a blank holder. The blank holder can be moved by at least one hydraulic cylinder-piston unit which has at least one pressure chamber. By way of a connection line, the pressure chamber is connected di... | 05/04/2004 |
| 6663089 | Hydraulic cylinder with boosting function A fluid pressure cylinder with pressure intensifying function, has an oil-filled hydraulic pressure cylinder which is filled with oil and tightly sealed. A gas-filled gas spring is charged with gas and tightly sealed. By means of gas spring, oil in oil ch... | 12/16/2003 |
| 6516696 | Sleeve-type gas spring A sleeve-type gas spring for a turret indexing press has an annular piston operably associated with a punch tool to reciprocate therewith and defining in part an annular gas chamber constructed to receive a gas under pressure. As the punch tool and piston... | 02/11/2003 |
| 6491143 | Low impact gas spring A spring having a main gas chamber, a secondary gas chamber and sealing surfaces which, during a portion of the stroke of the piston rod, define a gas tight seal between them to provide two separate gas chambers each providing a force acting on the piston... | 12/10/2002 |
| 6460396 | Power press This invention relates to a hydraulic force modulator used in a power press to provide a predetermined force with a defined force applied by a ram of the press at defined incremental positions of the ram relative to a stationary part of the press. A movea... | 10/08/2002 |
| 6457702 | Annular bellows unit for vehicle suspension An annular bellows unit for replacing a vehicle suspension coil spring that encloses a shock absorber or hydraulic actuator includes annular second flange members that are sealingly connected at opposite ends of respective inner and outer bellows members ... | 10/01/2002 |
| 6412616 | Energy dissipation system An energy dissipation system for limiting forces applied to object; includes a piston rod that extends out of a pneumatic cylinder which contacts the object, the piston rod is forced from its initial position against a return spring and air is forced into... | 07/02/2002 |
| 6390457 | Soft-start, soft-return gas spring A gas spring includes an outer tube; a base plate; a head plate; an inner tube mounted to extend between the head plate and the base plate; a piston/rod assembly mounted to reciprocate vertically in the inner tube between a retracted, compressed position ... | 05/21/2002 |
| 6332602 | Vehicle suspension having annular air chamber An annular bellows unit for replacing a vehicle suspension coil spring that encloses a shock absorber or hydraulic actuator includes annular second flange members that are sealingly connected at opposite ends of respective inner and outer bellows members ... | 12/25/2001 |
| 6322059 | Low contact force spring A fluid spring assembly. The spring assembly preferably includes a body that slidably supports a piston that is attached to a piston rod. The piston serves to define a fluid chamber within the body that is charged with a pressurized fluid medium. The pist... | 11/27/2001 |
| 6237381 | Power press ram force modulation and apparatus for use therewith This invention relates to a hydraulic force modulator used in a power press to provide a predetermined force with a defined force applied by a ram of the press at defined incremental positions of the ram relative to a stationary part of the press. A movea... | 05/29/2001 |
| 6170809 | Delay return gas spring A gas spring with a first gas chamber communicated with a second gas chamber through a calibrated orifice to control the rate of return of gas from the first chamber to the second chamber to thereby control the rate at which a piston rod of the cylinder r... | 01/09/2001 |
| 6145819 | Die cylinder and manifold and system A plurality of die cylinders adapted to contain gas under pressure are mounted on a manifold. Each cylinder comprising a cylinder body having an axially inner cylinder portion and an axially outer cylinder portion. A piston has an axially inner end portio... | 11/14/2000 |
| 6131497 | Gas cylinder with time delay A die stamping system in which an upper die moves downwardly toward and upward away from a lower die to stamp a workpiece, and in which a portion of the lower die is supported by at least one gas cylinder coupled to gas under pressure to cushion downward ... | 10/17/2000 |
| 6068245 | Apparatus and method for cushioning the action of draw dies operating in a stamping press and the like A draw die operable within a straightside press includes a lower die shoe with a lower die; pressurized lift cylinders each having an upwardly extending piston rod and an axial resistance to compression; a generally ring-shaped cushion defining a central ... | 05/30/2000 |
| 6059273 | Gas spring arrangement The invention relates to an arrangement for a gas spring. The arrangement comprises a cylinder (1). At its one end, this is delimited by a fixed end wall (2), and at its other end there is a first guide (3) sealed against the inner wall of the cylinder (1... | 05/09/2000 |
| 6022004 | Self-lubricating fluid cylinder A self-lubricating cylinder assembly for use in a press operable in an upright orientation and in an inverted orientation. The cylinder assembly contains a working fluid under pressure and lubricating oil. The cylinder assembly includes a cylinder body th... | 02/08/2000 |
| 5813275 | Safety circuit for press die cushion A safety circuit for a press die cushion wherein the press die cushion has a pad that is resiliently supported by a cushion cylinder which is supplied with a pilot pressure via an air delivery circuit, and wherein the press die cushion has a locking circu... | 09/29/1998 |
| 5735201 | Apparatus including mutually communicating hydraulic cylinders for even distribution of blank-holding force on pressing machine A balancing apparatus for a pressing machine, including a force generating device for generating a force during a pressing operation on a blank, and a plurality of balancing hydraulic cylinders which have respective oil chambers communicating with each ot... | 04/07/1998 |
