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| Number | Title | Issue Date |
| 7316341 | Adjustable exhaust assembly for pneumatic fasteners An adjustable exhaust assembly for a pneumatic fastener includes a base, which includes a base plate and a protrusion protruding from the base plate. The protrusion is centrally hollow and includes an inner surface and an outer surface. The base plate includes an in... | 01/08/2008 |
| 7296669 | Simple action actuator with a hydraulic fast-opening valve for controlling a clutch An actuator with a simple function for the control of a friction clutch in the drive train of a motor vehicle having a cylinder/piston unit for generating the contact pressure of the clutch should be fast, inherently safe and nevertheless simple and inexpensive. For... | 11/20/2007 |
| 7278561 | Oil free head valve for pneumatic nailers and staplers The present invention provides a head valve assembly for a pneumatic fastener including a piston assembly reciprocated within a cylinder assembly for driving a fastener and a housing having an end cap for at least partially enclosing the head valve assembly. The hea... | 10/09/2007 |
| 7146902 | Hydraulic directional converter A hydraulic system comprises a pump having a fluid feed end a fluid release. Hydraulic actuator has an advance port and a retract port A directional converter is fluidically coupled between the pump and the hydraulic actuator. The converter has a housing having a pl... | 12/12/2006 |
| 7137540 | Dual mode pneumatic fastener actuation mechanism A contact safety and trigger mechanism for use with a pneumatic fastener in order to permit efficient pneumatic fastener actuation mode selection. A rotating rod is included in a contact safety assembly which is constructed to slide toward/away from a driver housing... | 11/21/2006 |
| 7100373 | Hydraulic tool A hydraulic tool is provided with a spool valve 24 for changing the flow of a working fluid pressurized by a hydraulic power generating mechanism in a hydraulic circuit. The spool valve 24 is slidable in directions perpendicular to a piston rod 18 | 09/05/2006 |
| 7040520 | Fan motor suspension mount for a combustion-powered tool A motor mount for suspending a fan motor in a combustion-powered tool includes an inner ring for securing to the motor, an outer ring that is secured to a portion of the tool, and a web portion disposed between and connecting the inner ring and outer ring. The inner... | 05/09/2006 |
| 6978609 | Electrohydraulic servo door drive for operating a door, a window, etc. The invention pertains to an electrohydraulic servo door drive for operating a door, a window, or the like, with a hold-open function, where a valve is installed in the hydraulic circuit to implement the hold-open function. To create an electrohydraulic servo door d... | 12/27/2005 |
| 6907815 | Control apparatus of hydraulic valve for holding load The present invention relates to a control apparatus of a hydraulic valve for holding load in which a drain line of a holding valve adapted to preclude momentary drop of load in a hydraulic actuator is substituted with a path in the interior of a directional control... | 06/21/2005 |
| 6851350 | Valve device for a control cylinder For a valve arrangement of a pneumatically actuated, spring-loaded control cylinder, a non-return valve in pneumatic communication with the control cylinder piston chamber. At very low backpressures in the control cylinder piston chamber caused by leaks of the valve... | 02/08/2005 |
| 6715282 | Actuator device, in particular for operating the stand of motorcycles, and automatically releasable hydraulic valve A valve and a device for actuating the rotation of a stand (4) of a motorcycle (2) comprising an hydraulic actuator (1) operating an actuating member (7) between a first and a second position bringing the stand (4) from a rest posi... | 04/06/2004 |
| 6276257 | Working cylinder, switch valve and pressure-actuated working unit A working cylinder (A) having at least one working chamber (6, 7) defined by the cylinder barrel (1), at least one of the end sections (2, 3) and a piston (4), at least one supply port (9a, 9b) and a exhaust port (12a, 12b) for the working medium. The exh... | 08/21/2001 |
| 6135906 | Gas actuating device with an exhaust passage that prevents contamination of an actuating member A gas actuating device includes a housing having a gas applying chamber, an actuator chamber and a gas applying passage for communicating gas from the gas applying chamber to the actuator chamber. An actuating member having a first side and a second side ... | 10/24/2000 |
| 5992721 | Rodless cylinder rope tensioning apparatus A rodless cylinder rope tensioning apparatus maintains tension in an endless rope system operable for threading a web in a paper-making apparatus and includes at least one rodless cylinder having at least one yoke sheave attached to the internal piston in... | 11/30/1999 |
| 5865419 | Pneumatic actuator having an end mounted control device This invention features a device for controlling the operation of a pneumatic actuator and a pneumatic actuator having such a control device. More particularly, the actuator control device of the instant invention includes a housing mounted to an actuator... | 02/02/1999 |
| 5848779 | Servomotor, particularly for a quick-action stop valve A controlling motor for moving a stem along an axis has a hydraulic actuator with a cylinder in which a piston that is frictionally linked to the stem is slidingly and sealingly mounted, as well as a compression spring that is frictionally linked to the s... | 12/15/1998 |
| 5651436 | Brake and clutch control system A control system for a press having a clutch and a brake includes a clutch control valve and a brake control valve. The clutch control valve operates the clutch by supplying pressurized air to the clutch. The brake control valve operates the brake by supp... | 07/29/1997 |
| 5623861 | Pneumatic cylinder and control valve therefor A pneumatic cylinder, especially for a spot-welding machine, has a sleeve valve mounted on the piston rod. The sleeve valve provides a venting valve for dumping pressure from a return chamber at the end of the forward stroke, and a progressive restrictor ... | 04/29/1997 |
| 5613420 | Reciprocating engine An engine for driving a piston arrangement for pumping water from an inlet to an outlet at a higher level is disclosed. The engine includes a hollow housing having an inlet and an outlet between which liquid passes, the housing at least partly enclosing a... | 03/25/1997 |
| 5467683 | Actuating drive for a control valve This actuating drive (1) for a control valve (2) has a control circuit which sets the actuating drive (1) to correspond with a specified required value from an overriding installation control system. It has, in addition, a main piston (6) sliding in a mai... | 11/21/1995 |
| 5465746 | Pneumatic circuit to provide different opening and closing speeds for a pneumatic operator A pneumatic circuit prolongs a pneumatic valve opening time using an accumulator with two quick exhaust type valves in series while providing a rapid valve closing time. This structure and method is self-contained and amenable to retrofit in existing inst... | 11/14/1995 |
| 5435227 | Operating mechanism for a hydraulic actuator having a pressure-proportional actuating signal This operating mechanism for a hydraulic actuator (2) having a pressure-proportional actuating signal is provided with an amplifier (33) for electric signals, with at least one electrohydraulic transducer (24) connected upstream of the hydraulic actuator ... | 07/25/1995 |
| 5419236 | Method for controlling a hydraulic drive and configuration for carrying out the method In a method and a configuration for operating a hydraulic drive, a 3/2-port directional seat valve, which is driven by solenoid coils, controls an application of high-pressure fluid through a working piston of a piston/cylinder system. In order to increas... | 05/30/1995 |
| 5379679 | Acutator with series arranged control valves The present invention comprises a double acting actuator having a piston movable within a cylinder, a main poppet control valve connected to a fluid pressure source, and first and second poppet valves connected in series to a rod side chamber of the cylin... | 01/10/1995 |
| 5209153 | Portable hydraulically operated device incorporating automatic drain valve A hydraulically operated device including a single-acting cylinder having a piston for operating a working tool, a pressure chamber for applying a hydraulic pressure to the piston from an original position to an operated position, and a return spring for ... | 05/11/1993 |
| 5207143 | Pneumatic fastener driving apparatus with an improved valve A pneumatic operated fastener driving device having a trigger valve and an improved main valve with a flexible membrane that controls the flow of compressed air to and from the cylinder. The flexible membrane maintains the main valve close no matter when ... | 05/04/1993 |
| 5111735 | Air spring with quick release valve An air spring apparatus has quick pressure release, and rapid air exhaust, capability by means of a relatively large diameter exhaust port in a larger, primary air spring which is controlled by the action of a smaller, secondary air spring. The secondary ... | 05/12/1992 |
| 5085126 | Pneumatic percussion tool with relatively movable head valves A pneumatic percussion tool includes a head valve device including first and second head valves disposed in the body and movable in response to the pressure variation in the head valve chamber. The first and second head valves are positioned at a first po... | 02/04/1992 |
| 5050483 | Flow control device A flow control device includes a control valve having a discharge line to be connected to a hydraulic motor, a supply line to be connected to a hydraulic pump, a first bleed-off control passage having a line connected to a tank, and a second bleed-off con... | 09/24/1991 |
| 5014734 | Quick drop valve Quick drop valves are usable in hydraulic circuits in which fluid is expelled from a hydraulic cylinder due to gravity force acting on a load connected to the hydraulic cylinder. The present quick drop valve has a sleeve carried by a valve member for esta... | 05/14/1991 |
| 4907684 | Ball drain valve for the piston space of a rotary multi-disc clutch A ball drain valve (2), for the piston space (33) of a rotary clutch disc (3) for releasing the clutch disc piston (32) from pressure generated by rotation of pressurized oil remaining in the piston space when it is bled, including an opening (220), at le... | 03/13/1990 |
| 4840261 | Automatic transmission having centrifugally operable drain valve in hydraulically operated clutch actuator A hydraulic actuator for hydraulically actuating a clutch mechanism to selectively engage a clutch drum and a planetary gear unit of an automatic transmission is disclosed, which comprises a chamber defined by the clutch drum; a piston operatively dispose... | 06/20/1989 |
| 4802402 | Cylinder having an internally-disposed drain valve A work cylinder having an internally-disposed, automatically-operated drain valve disposed in one or both ends of a housing having a cylinder bore formed therein. A reciprocally-movable piston divides the bore into first and second pressure chambers. A dr... | 02/07/1989 |
| 4690035 | Emergency draining device for stopping pneumatic cylinders An emergency drain device for pneumatic cylinders which is integrated in an orientatable connection fixed directly to the cylinder body and comprises a valve which closes an orifice of the bolt of the connection, going to the atmosphere, when a control pr... | 09/01/1987 |
| 4611528 | Power transmission A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing co... | 09/16/1986 |
| 4586535 | Solenoid valve unit A solenoid valve unit for the control of the supply of compressed air to an air driven load and controlling the letting off of such air from the load has a valve housing with a pressure port, a power air port, a let off port for the valve space and a furt... | 05/06/1986 |
| 4519421 | Solenoid valve A solenoid valve has an air outlet or relief plate fixed thereon. The valve in keeping with the invention is so designed that only high pressure air flows are switched or controlled, one such flow being used for the pilot control of a large-size air outle... | 05/28/1985 |
| 4414882 | Pneumatic drive for switching elements and control elements A pneumatic drive for actuating switchable devices such as valves and the like includes a cylinder and a cylinder base, the cylinder having an annular slot which extends in a plane transverse to the axis of the cylinder between an interior cylinder space ... | 11/15/1983 |
| 4399900 | Centrifugal hydraulic head relief valve A pressure responsive relief valve closing responsive to clutch actuating pressure and opening responsive to centrifugal forces and a spring force to relieve residual pressure in the hydraulic actuator of a rotating clutch to avoid clutch drag.... | 08/23/1983 |
| 4383476 | Apparatus for controlling a single action operating cylinder, especially of a press operating cylinder An apparatus for controlling a single action piston and cylinder having means biasing the piston toward a retracted position within the cylinder and having a non-return valve openable toward the cylinder connecting the cylinder with a fluid pressure sourc... | 05/17/1983 |
