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| Number | Title | Issue Date |
| 7698991 | Spring-return, pneumatic actuator A spring-return, pneumatic actuator includes a casing having therein a cylinder chamber, a housing chamber and a spring chamber and equipped therein with a piston reciprocating by air supplied and discharged from an air supply and exhaust vent on a primary side of t... | 04/20/2010 |
| 7393187 | Diaphragm pump with integrated pressure sensor A diaphragm pump includes a pressure sensor disposed in the housing thereof, and which is used as an expansion tank for protecting the pressure sensor. To avoid excess pressure on the pressure sensor, the pressure sensor membrane is directly disposed in the pump hea... | 07/01/2008 |
| 7287376 | Hydraulic cylinder, in particular slave cylinder for a hydraulic clutch actuation system for motor vehicles A hydraulic cylinder comprises a piston assembly with a piston and a piston rod, a cylinder housing with a housing bottom, a pressure chamber in the cylinder housing delimited by the piston and housing bottom, a spring element which prestresses the piston assembly a... | 10/30/2007 |
| 7267042 | Hydraulic motor with telescopic propulsion members retained sealingly against associated contact surfaces by internal resilient means Hydraulic motor with propulsion members (10) positioned between a cam (3) associated with a shaft (2) and a reaction element (1b), said propulsion members (10) consisting of two elements (11,12), i.e. an internal elem... | 09/11/2007 |
| 7249938 | Linear compressor Disclosed herein is a linear compressor. In the present invention, the configuration that a sealing protrusion is protruded in a sealing part of a cylinder toward an exhale cover leads line contact with the exhale cover and the sealing protrusion of the sealing part... | 07/31/2007 |
| 7028601 | Abrasion preventive structure of reciprocating compressor In an abrasion preventive structure of a reciprocating compressor, by forming a coating layer made of Ni—P alloy material having high hardness onto the surface of a frame at which front (92) and rear (93) resonance springs are contacted or spring mou... | 04/18/2006 |
| 6865982 | Valve actuator A fluid operated actuator comprising a cylinder, a piston and a linkage rod connected to the piston, in which the cylinder is curved through a number of degrees. ... | 03/15/2005 |
| 6793470 | Spring supporting structure for reciprocating compressor A spring support structure for reciprocating compressor having a frame unit elastically supported inside a closed container; a reciprocating motor fixed at the frame unit; a compression unit having a piston combined to an armature of the reciprocating motor and a cy... | 09/21/2004 |
| 6783335 | Linear compressor having an anti-collision device A linear compressor with an anti-collision device, which prevents a piston of the compressor from being brought into collision with a cylinder head and/or a suction valve even when the piston moves past an upper dead center position during an operation of the compre... | 08/31/2004 |
| 6725975 | Positioning rotary actuators In order to position a rotary actuator, a positioning device is coupled to the actuator. The positioning device has a coupling shaft and springs which respectively surround top and bottom portions of the shaft and are coupled thereto by respective coupling rings. Th... | 04/27/2004 |
| 6638035 | Resonant assembly for a reciprocating compressor with a linear motor A resonant assembly for a reciprocating compressor driven by a linear motor. The compressor includes a piston (2), driven by an actuator (3), which reciprocates inside a cylinder (1a) provided with an end closed by a head. The assembly comprises a resonan... | 10/28/2003 |
| 6435842 | Spring supporting structure of linear compressor The present invention relates to a spring supporting structure of a linear compressor which is capable of reducing the horizontal length of the compressor by reducing the overall length which adds the length of an inner resonance spring to the length of a... | 08/20/2002 |
| 6422530 | Fail-safe fluid actuator A fail-safe fluid actuator comprising a piston slidably disposed within a cylinder. In the event of a pressure loss, the piston is urged to a fail-safe position by a plurality of externally mounted constant force spring mechanisms. In one embodiment the m... | 07/23/2002 |
| 6413057 | Plurality of outer resonance springs for a linear compressor A linear compressor including: a cover fixed at a rear side of a frame; a cylinder fixedly installed in a horizontal direction at the center of inside of the frame; an inner stator assembly fixedly installed at the frame in a state that its inner circumfe... | 07/02/2002 |
| 6216580 | Reaction mechanism for booster In accordance with the invention, a booster is not provided with a mechanism which transmits a braking reaction, and accordingly, a reaction cannot be transmitted to a brake pedal. On the other hand, a pseudo-reaction imparting means is provided to impart... | 04/17/2001 |
| 6182678 | Apparatus for safely installing and removing spring failsafe actuator Apparatus for safely installing and removing spring loaded failsafe valve actuators. The apparatus includes a frame that retains a compression spring in a loaded condition between a cover plate fastened to the top wall of the frame and a spring seat slida... | 02/06/2001 |
| 6164184 | Reaction mechanism for booster In accordance with the invention, a booster is not provided with a mechanism which transmits a braking reaction, and accordingly, a reaction cannot be transmitted to a brake pedal. On the other hand, a pseudo-reaction imparting means is provided to impart... | 12/26/2000 |
| 6041804 | Subsea valve actuator and method A subsea actuator and method is disclosed that includes a removable monolithic cap/hydraulic chamber that seals the actuator housing top with seals placed around the monolithic cap, defines a straight hydraulic line and port for control line hydraulic flu... | 03/28/2000 |
| 6000675 | Tension-spring return rotary valve actuator A rotary valve actuator with movable actuator linkage maintained in a constant "pull-pull" tension, includes a sliding canister, rotatable lever, and a return spring substantially aligned in-line with each other. The linear motion of the canister in respo... | 12/14/1999 |
| 5992252 | Constant force side button engagement mechanism The inventive button pushing mechanism allows pneumatic force to be translated actuate a button on a cellular telephone that is being tested by an automatic testing machine. The mechanism includes an actuating shaft that transmits pneumatic force to a spu... | 11/30/1999 |
| 5979864 | Double convoluted pliable pressure conversion unit A rotary valve actuator with movable actuator linkage maintained in a constant "pull-pull" tension, includes a sliding canister, rotatable lever, and a return spring substantially aligned in-line with each other. The linear motion of the canister in respo... | 11/09/1999 |
| 5938416 | Liquid transfer apparatus having a plunger pump and a diaphragm pump for cleaning the plunger during its reciprocating motion A liquid transfer pump includes a housing having an inner space, a cross head disposed in the inner space of the housing and attached to a driving mechanism to reciprocate inside the housing, a plunger attached to and held by a plunger holder of the cross... | 08/17/1999 |
| 5626054 | Load decoupler Device for absorbing lateral forces generated as a result of a linearly reciprocating pin causing rotation of a scotch yoke, the device including a guide block guided along a guide rod, the guide block carrying a yoke engaging pin as well as having oppose... | 05/06/1997 |
| 5601110 | Module locking device A device used in an actuator for locking in place a spring module while under load, the device including a spring return cylinder carrying a spring under compression when under load, a spring guide, a pull rod linked to a piston in a power cylinder, and a... | 02/11/1997 |
| 5244004 | Hydraulic pipeline valve operating system A hydraulic pipeline valve operating system (10) includes a tank (12) which holds a quantity of unpressurized hydraulic fluid. A pump (14) provides that fluid under pressure to a valve actuator (11). The valve actuator has an actuator cylinder (40) having... | 09/14/1993 |
| 5239778 | Modular door control apparatus with quick release connection A quick release door closer including a hydraulic assembly and a spring assembly connected at a quick release connection. The quick release connection includes a retaining element and element housing structured to allow the door closer to be easily mainta... | 08/31/1993 |
| 5178360 | Wire cutting valve actuator The invention is a valve actuator or a booster module for an existing valve actuator that provides an incremental force to the valve stem at a position close to valve closure. The force is stored in a spring which is held in the compressed position by a c... | 01/12/1993 |
| 5079995 | Auxiliary remote-controlled release device for a positively acting mechanism The positively acting mechanism comprises a jack (2) with a rod (10) connected, at one of its ends, to a member whose actuation or retention it ensures, and, at its other end, to a thrust piece (16), on which a spring (18) comes to bear, in order to actua... | 01/14/1992 |
| 5070766 | Hydraulic valve actuator This hydraulic actuator has a drive volume (11) pressurized by extreme-pressure oil. The oil pressure is converted into a valve movement by a drive piston (10). A spring element acts upon the drive piston (10) in a manner opposing the oil pressure. The ac... | 12/10/1991 |
| 5044160 | Mechanism for obtaining a motion of translation in a marine environment The disclosed mechanism is designed so as to be impervious and give a motion of translation enabling, for example the driving of a hinged arm. The mechanism has a hydraulic circuit with fluid, a jack associated with a pull-back spring and a pump to bring ... | 09/03/1991 |
| 5007330 | Rotary actuator and seal assembly for use therein A rotary actuator comprising a housing which defines an arcuate chamber, the housing including a first monolithic portion in which the arcuate chamber is completely contained, a piston disposed in the housing for reciprocable movement in the arcuate chamb... | 04/16/1991 |
| 4967785 | Valve actuator A valve actuator is disclosed which is encased in a housing with a bonnet mounted at one end and an end cap on the other end. Inside, an actuator shaft is slidably mounted through a bore on a guide connected to the bonnet. A piston is slidably mounted wit... | 11/06/1990 |
| 4884495 | Fluid motor actuator with compression spring fail-safe mechanism A fluid motor actuator of the type in which an actuator member is moved in either one of two opposite directions from a rest position to an actuated position includes a fail-safe mechanism having compression springs coupled with the actuator member for co... | 12/05/1989 |
| 4765229 | Portable vacuum pump for desoldering purposes A portable vacuum pump for desoldering applications has a hollow cylindrical barrel forming a vacuum cylinder containing a plunger. The pump has a trigger housing containing a single compression spring. The spring is mounted outside the barrel. No separat... | 08/23/1988 |
| 4744386 | Modular hydraulic actuator A surface safety valve hydraulic actuator of modular construction. The actuator includes separately installable, removable, and interchangeable wirecutting and non-wirecutting spring modules, used with the same hydraulic cylinder and bonnet. The bonnet is... | 05/17/1988 |
| 4702150 | Spring-return type actuator A spring-return type actuator for valves including a piston cylinder mechanism, a movement conversion-transmission means disposed in the piston cylinder mechanism for converting reciprocation of a piston into a rotary motion of a valve drive shaft, a spri... | 10/27/1987 |
| 4688661 | Adjustable brake actuator, especially for vehicle drum brakes A casing (10) has a bore (14) and a clutch face (48) concentric with the bore. In the bore (14) a tappet (30) of variable length is slidably guided and includes two threaded members (34,36) interconnected by a self-locking screw thread pair (38). A clutch... | 08/25/1987 |
| 4568011 | Vacuum pump for desoldering gun A vacuum pump for a desoldering iron gun which comprises a cylinder closed at one end with a piston movable in the cylinder, and device including a valve connecting the closed end of the cylinder to the gun. A spring normally urges the piston away from th... | 02/04/1986 |
| 4519575 | Valves and valve actuators There is disclosed a gate valve which is moved to open position by an extendible and retractable, fluid-operated actuator, and which is moved to closed position, upon exhaust of operating fluid, by coil springs which urge follower parts reciprocable with ... | 05/28/1985 |
| 4487111 | Apparatus for generating reciprocatory motion Apparatus for generating linear motion comprises a body on one end of which is mounted a cylinder. A piston in the cylinder is joined to an actuating beam extending into the body. The actuating beam has moving surfaces that cooperate with fixed surfaces i... | 12/11/1984 |
