Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7278522 | Controllable motion damper A controllable motion damper with a damping piston separating two damping chambers from each other in a damping cylinder. A damping valve is disposed in a connecting channel of the two damping chambers with the transmissivity of the damping valve for a damping fluid... | 10/09/2007 |
| 7134701 | Frame for lifting beams and other elongated loads A lift frame adapted to be pivotally mounted on a hoist include a tubular sleeve guide that guides a lift slide. The lift slide carries a lift frame for supporting a load such as a beam or truss to be lifted, and is spring loaded in an upward direction by a spring e... | 11/14/2006 |
| 7036802 | Self-pumping hydropneumatic suspension strut A suspension strut includes an outer tube having a first filling opening and a second filling opening, an intermediate wall received in the outer tube and separating a high pressure chamber from a low pressure chamber, a working cylinder located concentrically insid... | 05/02/2006 |
| 7007342 | Door closer The present invention relates to a door closer, in a housing of which is received a sliding cylinder, the sliding cylinder is provided with teeth on an outer periphery thereof for meshing with a gear wheel of a door shaft, a sliding cylinder interiorly formed with i... | 03/07/2006 |
| 6913126 | Impact damper An impact damper for deceleration of a vehicle impacting on all obstacle by hydraulic damping forces and gas spring forces includes at least inner and outer pipes telescopically displaceable one inside the other and defining an annular space therebetween with a base... | 07/05/2005 |
| 6062551 | Active vibration-isolating device The active vibration-isolating device of the invention is used for preventing vibrations due to ground motions or running of an automobile from being propagated to a platform which is disposed in, for example, a semiconductor device factory or a laser dev... | 05/16/2000 |
| 5660379 | Pneumatic spring A pneumatic spring for damping movement of a machine part having a guide shaft for performing a stroke. The spring includes a housing containing gas. The housing is formed as a stationary body with a central opening adapted to accommodate the guide shaft.... | 08/26/1997 |
| 5507475 | Erector for holding a leaf-flap in various opening settings An erector holds a leaf-flap in various opening settings relative to its frame, in particular for holding a motor-car hood. The erector has a continuously length-variable dynamic unit, which comprises, supported against the leaf-flap and frame, a hollow c... | 04/16/1996 |
| 5472071 | Shock-absorbing strut for hydraulic wheel-drive unit A shock-absorbing strut in which fluid passages extend through the strut to communicate with a hydraulic wheel drive of the wheel assembly to which a movable part of the strut is affixed. Telescoping connectors are provided between the outer guide housing... | 12/05/1995 |
| 5178239 | Shock absorber A shock absorber includes an extruded reservoir housing and a sleeve with position valving therein. The shock absorber coordinates the position valving and valving in the piston assembly in a manner such that the position of the piston assembly relative t... | 01/12/1993 |
| 5100113 | Pneumatic die cushion equipment A closed type cylinder unit, instead of the open-to-atmosphere type cylinder unit of conventional equipment forms part of the die cushion apparatus. Based on the principle that the die cushion capability by the closed type cylinder unit is determined by t... | 03/31/1992 |
| 4799827 | Modular riser tensioner incorporating integral hydraulic cylinder accumulator units A tensioner unit (12) comprising an inner cylinder (22), filled partially with hydraulic fluid, with a piston (26) and piston rod (28) reciprocal therein (sometimes referred to as a hydraulic cylinder) surrounded by a cylindrical chamber (40) (sometimes r... | 01/24/1989 |
| 4796871 | Gas spring with end position damping A gas spring with end positions damping has a cylindrical housing filled with a fluid under pressure, in which a piston rod, sealingly extending from one end of the housing, is disposed to be coaxially slideable and on the inner end of which a piston is a... | 01/10/1989 |
| 4630805 | Tension-compression liquid spring unit A liquid spring unit operable in both tension and compression including a cylinder, compressible liquid in the cylinder, a piston and a seal for the piston, a first sleeve mounted for telescopic movement with respect to the cylinder, a collapsible housing... | 12/23/1986 |
| 4611794 | Tension-compression liquid spring unit A liquid spring unit operable in both tension and compression includes a liquid spring having a cylinder, a piston, a seal between the cylinder and piston, and compressible liquid in the cylinder. A cylinder extension has diametrically opposed slots there... | 09/16/1986 |
| 4519481 | Suspension strut for vehicles A suspension strut for a vehicle comprises a cylinder in which works a piston, and the piston is carried by a piston-rod which passes through an axial extension depending from a closure for one end of the cylinder. An annular chamber defined between the c... | 05/28/1985 |
| 4438910 | Shock absorbing snubber for derrick hooks An improved shock absorbing snubber for derrick hooks is shown which includes a stationary hydraulic plunger and a telescoping barrel arrangement. A spring loaded check valve mounted on the plunger allows generally free fluid flow as the barrel is moved i... | 03/27/1984 |
| 4411342 | Hydraulic damper A hydraulic damper includes a dual-tube type housing consisting of inner and outer tubes, a piston slidably disposed in the inner tube and dividing the interior thereof into two oil chambers, a piston rod secured to the piston and extending to the outside... | 10/25/1983 |
| 4351261 | Riser recoil preventer system A recoil system and method for supporting a marine riser which is extended from offshore well head equipment to a floating platform are disclosed. The purpose of the recoil system is to prevent a violent collisin of the riser with the platform when the ri... | 09/28/1982 |
| 4274517 | Hydraulic shock absorber A hydraulic shock absorber of the type including a tubular main body having of an inner tube containing oil and slidably receiving a piston and an outer tube surrounding the inner tube to define around the inner tube an annular reservoir chamber containin... | 06/23/1981 |
| 4274515 | Shock absorber A shock absorber of the hydraulic-pneumatic type includes a cylindrical casing closed at both ends and partially filled with a liquid damping medium. A piston is reciprocable in the casing, has valve controlled passages and a piston rod thereon extending ... | 06/23/1981 |
| 4240619 | Gas spring for balancing the weight of the lid on the trunk of a motorcar and like applications A gas spring includes a cylinder, filled with compressed gas, a piston rod movable axially inward and outward of the cylinder cavity, and a piston axially movable on the end of the piston rod in the cavity and resiliently biased into engagement with an ab... | 12/23/1980 |
| 4222555 | Hydraulic cushioning device for vehicle seat A hydraulic seat cushioning device comprising a cylinder body and a piston has a concentric post-like upward projection in the cylinder body with a cylindrical surface in which there are a pressure fluid port and a vent port. An annular valving element cl... | 09/16/1980 |
| 4222341 | Riser tensioning wave and tide compensating system for a floating platform A riser tensioner cylinder is provided with a hollow piston rod which forms a second cylinder in which a ram is reciprocated. The free end of the ram is connected to a link which in turn is connected to the end of the riser for providing tension on the ri... | 09/16/1980 |
| 4175733 | Hydraulic inertia filled spring The hydraulic spring comprises a fixed part innerly provided with an axial bore communicating with a reservoir of liquid and having an outlet aperture, a moving part filled with liquid, surrounding the fixed part and provided with an inside recess. The in... | 11/27/1979 |
| 4165066 | Apparatus for active reduction of vertical vibrations of a vibrating mass With the purpose of attaining effective reduction of vertical vibrations, there is arranged in vertical direction between the vibrating mass and the excitation source one or more little-damped springing systems which include compressed-air springing eleme... | 08/21/1979 |
| 4082610 | Snubber assembly for a control rod drive A snubber cartridge assembly is mounted to the nozzle of a control rod drive mechanism to insure that the snubber assembly will be located within the liquid filled section of a nuclear reactor vessel whenever the control rod drive is assembled thereto. Th... | 04/04/1978 |
| 4065112 | Hydraulic jack cushioning apparatus Cushioning apparatus for cushioning a hydraulic jack is disclosed which includes a plunger reciprocably mounted within a blind bore. The plunger sequentially closes off a plurality of axially spaced orifices provided through the wall of the bore as the pl... | 12/27/1977 |
| 4039177 | Heave compensation apparatus for a marine mining vessel A ship in which a string of heavy pipe is raised or lowered vertically beneath the ship at a substantially constant velocity in spite of heaving movement of the ship. The equipment for raising and lowering the pipe string is supported by the vessel throug... | 08/02/1977 |
| 4033566 | Pneumatic linear spring device A linear spring system using pneumatic cylinders arranged to give a substantially linear force versus displacement curve across a wide range of displacement and which is capable of providing large forces with mechanism.... | 07/05/1977 |
| 4014533 | Resilient load-bearing support for a vehicle An improved vehicle-mounted support for isolating delicate loads from shocks and other disturbances imparted to the vehicle floor during movement thereof over rough terrain is described. A plurality of adjustable pneumatic springs are disposed in each cor... | 03/29/1977 |
| 4004532 | Riser tension system for floating platform A riser is tensioned from a floating platform by the use of one or more active hydraulic heave compensator units, each having an in-line backup unit coupled thereto so that the backup unit will automatically take over the load if there is loss of pressure... | 01/25/1977 |
| 3991989 | Movement direction reversal device A direction reversal device including a housing and an abutment rod passing through, and movable relative to, the housing, one of the housing and the rod being stationary and the other being arranged to be impacted by a moving unit whose direction of trav... | 11/16/1976 |
| 3943868 | Heave compensation apparatus for a marine mining vessel A ship in which a string of heavy pipe is raised or lowered vertically beneath the ship at a substantially constant velocity in spite of heaving movement of the ship. The equipment for raising and lowering the pipe string is supported by the vessel throug... | 03/16/1976 |
