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| Number | Title | Issue Date |
| 7350628 | High force locking spring A spring system for relatively displacing elements attached to end mounts of the spring system. The spring system includes a housing having an axis, an internal chamber, and axially opposite bottom and top ends, a spring rod coaxial with the axis and positioned with... | 04/01/2008 |
| 7309043 | Actuation device positioning systems and associated methods, including aircraft spoiler droop systems Actuation device positioning systems and associated methods, including aircraft spoiler droop systems are generally disclosed herein. One aspect of the invention is directed toward a positioning system that includes an eccentric cam and a drive mechanism coupled to ... | 12/18/2007 |
| 7216581 | Piston locking actuator A locking actuator may be locked in an extended position. A piston with a first and a second end defines a recess that originates proximate to the first end. A strut is adapted to at least partially nest within the recess and the strut is adapted to hold at least on... | 05/15/2007 |
| 7197975 | Piston-cylinder unit Piston-cylinder unit including a working cylinder; a piston attached to a piston rod and installed with freedom of axial displacement in the working cylinder; and fastening elements, at least one of which is screwed into a threaded bore in the piston rod, where the ... | 04/03/2007 |
| 7195197 | Techniques for controlling a fin with unlimited adjustment and no backlash A fin control assembly includes a housing, an arm configured to couple to a fin and to steer the fin relative to the housing, and a locking member disposed within the housing. The locking member is configured to (i) lock the arm in a substantially fixed state to inh... | 03/27/2007 |
| 7137330 | Vehicle seat adjustment with actuator isolation valves A fluid powered vehicle seat adjustment system comprising a fluid actuator a source of pressurized hydraulic fluid and a controller. The fluid actuator including first and second inlet/outlet conduits, and the controller selectively controlling and directing pressur... | 11/21/2006 |
| 7125058 | Locking device with solenoid release pin A locking device with a solenoid release actuator includes a housing, a plunger axially slidable within the housing, a biasing member for biasing the plunger in a first direction, one or more locking balls, and the locking balls disposed in an aperture in the housin... | 10/24/2006 |
| 7124861 | Motion control apparatus A brake (10) having application for a linear or rotational motion device includes a housing (120) in which a first piston (140), a wedge (142) and a second piston (144) cooperate to engage a friction facing (136) through a p... | 10/24/2006 |
| 7105204 | Apparatus and method for coating the exterior surface of a pipe The exterior surface of a pipe is coated around its full perimeter without rotation of the pipe or the complete coating apparatus. In one example, the coating apparatus includes coating heads attached to a rotor with the coating material supplied under positive air ... | 09/12/2006 |
| 7065856 | Machine tool method A machine tool apparatus is provided employing a plurality of tool heads which may be sequentially or simultaneously automatically controlled to perform preprogrammed operations on either the same or different workpieces. In one form, a plurality of tool heads are s... | 06/27/2006 |
| 6945156 | Device for switching and locking moving points components The invention relates to a device for displacing and locking movable switch parts (1), comprising a hydraulic piston, which is formed by a rod (6) and cooperates, via coupling or locking members (8), with an axially displaceable sleeve (5... | 09/20/2005 |
| 6880446 | Air cushion cylinder apparatus with a lock A lock mechanism of a cylinder includes a lock member for locking or unlocking a piston rod by actions of air pressure and a spring force, a third pressure chamber for causing air pressure to act on the lock member, and a third port. In a pneumatic circuit, a check ... | 04/19/2005 |
| 6615703 | Hydraulic or pneumatic cylinder A pneumatic or hydraulic cylinder (10) having a bore (12) cooperating with a piston (18). Extending from the piston (18) is a piston rod (37). There is further provided a pawl (26) which is engageable with the piston (18) to retain the piston (18) at a de... | 09/09/2003 |
| 6202671 | Control valve for cryogenic liquid propellant A valve for controlling flow of cryogenic liquid propellant in a rocket engine comprises a double acting piston-cylinder unit having a first position in which the valve is closed and a second position in which the valve is open, a locking device being eng... | 03/20/2001 |
| 5735187 | Pneumatical piston-cylinder unit having a hydraulic control means A pneumatic piston-cylinder unit has a cylinder (1) in which an air piston (4) with a tubular piston rod (5) is reciprocably actuated by compressed air from two main air channels (18, 19). The air cylinder (1) includes an integrated hydraulic control syst... | 04/07/1998 |
| 5735122 | Actuator with failfixed zero drift The present invention provides an actuator controlled by an electro-hydraulic servovalve with a failfixed operation upon the loss of electrical power to the servovalve. A lock valve has apertures therethrough with friction pads therein for locking the act... | 04/07/1998 |
| 5727442 | Safety device at hydraulic piston-cylinder units The invention relates to a safety arrangement on hydraulic piston-cylinder units. In particular for monitoring locking cylinders, e.g., of operating tools mounted on a grab bucket boom. A sensor for monitoring the piston position is provided on the piston... | 03/17/1998 |
| 5531071 | Hydraulic system A hydraulic system comprises a mechanical brake assembly having a brake piston engageable with an output rotation shaft of a hydraulic motor, a cylindrical casing having the brake piston slidably received therein and a brake spring resiliently urging the ... | 07/02/1996 |
| 5497622 | Time delay valve of a hydraulic motor Disclosed is a a time delay valve, which has a reduced number of components so that the manufacture thereof is easy and the number of manufacturing processes is reduced, and by which the delay time thereof is easily reset and changed. The time delay valve... | 03/12/1996 |
| 5431085 | Thrust reverser actuator An actuator for a thrust reverser is disclosed which will prevent retraction of the thrust reverser door from its open, reverse thrust position should there be a malfunction in the locking system which locks the thrust reverser door in its closed forward ... | 07/11/1995 |
| 5409188 | Stability compensating mechanism of electro-hydraulic servo system In a stability compensating mechanism of an electro-hydraulic servo system which includes a load-displacement detecting unit for detecting a displacement of a piston of actuator or a displacement of a load connected to the piston, and a control valve for ... | 04/25/1995 |
| 5349894 | Locking hydraulic actuator A method for locking a hydraulic actuator in a predetermined position and a locking hydraulic actuator are provided. The method includes the steps of supplying hydraulic fluid to a forward chamber in the hydraulic actuator, transferring the hydraulic flui... | 09/27/1994 |
| 5235896 | Hydraulic cylinder/piston mechanism In a position independent locking of a hydraulic cylinder/piston mechanism, a pressure limiting member is provided in the supply pipe for the hydraulic medium, with the pressure limiting member being open during the hydraulic displacement of the piston an... | 08/17/1993 |
| 5209064 | Device for mutual immobilization of two elements mounted for relative rotation This invention relates to an assembly of a hydraulic motor and a combined device for immobilization, comprising: a reaction cam; a cylinder-block mounted to rotate with respect to the reaction cam; a first immobilization member fast with the cylinder-bloc... | 05/11/1993 |
| 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 |
| 5163351 | Hydraulic lock cylinder A hydraulic lock cylinder in which a cross bore is provided in an end structure of the cylinder housing which intersects the hydraulic fluid inlet passage to the central bore of the cylinder; a control piston is reciprocally mounted in the control bore; a... | 11/17/1992 |
| 5097748 | Hydraulic locking cylinder with throttled supply of fluid during unlocking stage A hydraulic cylinder that locks into position has a housing (1) with at least one pressure connection (7) and a piston (3) and rod (6) that travel tight in an out of the housing. The locking mechanism comprises a piston (11) that rests against a spring (3... | 03/24/1992 |
| 4951552 | Locking cylinder A hydraulic actuator including an actuator cylinder and a ram slidable therein from a retracted position to an extended position. This ram has an axially extending chamber positioned in an end section and a number of ball passageways extend between this c... | 08/28/1990 |
| 4854223 | Pneumatic or hydraulic drive for opening and closing of doors The invention is directed to a penumatic or hydraulic drive for opening and closing of doors, in which the linear motion of a double-acting piston 5 driven by a pressure medium is converted into a rotary motion of a spindle 2 through a piston rod 6 and a ... | 08/08/1989 |
| 4825746 | Universal power cylinder Power cylinder comprising a housing having a throughbore capped by end plates defining therein a longitudinally extending chamber. A piston including a longitudinally extending body portion mounts for reciprocal movement in and in bearing relation to the ... | 05/02/1989 |
| 4802401 | Pneumatically movable device with a safety lock means A pneumatically movable device with a safety lock means having a movable member, a pneumatic actuator connected to the movable member and adapted to move the movable member and a direction control valve connected to the actuator. A cylinder for locking is... | 02/07/1989 |
| 4781102 | Locking, bearing and actuating apparatus The apparatus comprise a generally tubular outer element, a generally cylindrical inner element disposed therewithin and sized relative thereto to provide a generally annular operating space therebetween. An intermediate element is disposed in said operat... | 11/01/1988 |
| 4770264 | Vehicle steering system A road vehicle has steerable front and rear wheels, the rear wheels being steered by an electro-hydraulic system responsive to the manual control input to the front wheels. The hydraulic actuator of the system is biased to the straight-ahead steering posi... | 09/13/1988 |
| 4736678 | Apparatus for selectively positioning rolls in a calender roll stack A hydraulic adjustment motor containing a piston-and-cylinder unit is provided at the roll surface of a roll to be moved to position the roll surface relative to another roll surface of a further roll. Each adjustment motor is arranged between the related... | 04/12/1988 |
| 4729462 | Automatic clutch control system having latch member A control system (70, 70A) is provided that is particularly advantageous for controlling an automatic vehicular clutch. Linkage (23, 23A) for operating the clutch preferably includes a control arm (18, 18A) that is engageable by a latch member (20, 20A) t... | 03/08/1988 |
| 4700925 | Pressure medium operated servomotor arrangement The servomotor arrangement has a moving system comprising a piston movable in a cylinder. A latching or retaining member movable transversely of the direction of movement of the system is provided to retain or latch the moving system. The latching member ... | 10/20/1987 |
| 4690033 | Self actuating locking and unlocking arrangement and method for reciprocating piston type actuators A method and arrangement for reciprocating a piston in a cylinder of a fluid actuated actuator between one and another alternate positions, and using the piston fluid actuator fluid to move a lock member from a first position to a second position to lock ... | 09/01/1987 |
| 4633758 | Double-acting working cylinder having a piston-dampening arrangement A fluid-pressure-operated, double-acting working cylinder which dampens the final braking of the work piston, includes a cylinder housing with a movable work piston disposed therein, the work piston dividing the cylinder into two work chambers. A piston r... | 01/06/1987 |
| 4586425 | Clamp locking device A piston-controlled locking mechanism including an external cylinder having annular retaining means, a first elongated piston located adjacent the cylinder and having ball lock positioning apertures in the extension, a second coaxially located piston posi... | 05/06/1986 |
| 4565349 | Fail safe hydraulic piloted pressure reducing and regulating valve A hydraulic piloted pressure reducing and regulating valve which is fail safe for holding the valve at the last selected operating pressure in the event of the loss of control signals. A pressure regulating valve having a body and a control piston therein... | 01/21/1986 |
