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| Number | Title | Issue Date |
| 7284473 | Fastening element and adapt cylinder cover of a fluid-actuated working cylinder An attachment element (12) for the selective pivotal and/or fixed bearing of a power cylinder, comprising a base region (33) having attachment means (45) for its attachment on a support structure (35) and from which two attachment arms ( | 10/23/2007 |
| 7066189 | Predictive maintenance and initialization system for a digital servovalve Provided is a servovalve system for regulating fluid flowing within a fluid circuit. The servovalve system comprises a housing, a spool slidably disposed within the housing, a stepper motor operatively connected to the spool, and a controller and a position sensor e... | 06/27/2006 |
| 6439101 | Electro-hydraulic servomotor An electro-hydraulic servomotor includes: an electric motor (41) which rotates a drive shaft (51) in response to an inputted signal; a hydraulic motor (60) which rotates an output shaft (61) using hydraulic pressure of operation oil; a first geared shaft ... | 08/27/2002 |
| 5844390 | Method and apparatus for regulating a fluid operated machine A fluid operated machine is monitored and regulated by providing a logic with a memory for storing the timings of properly operating functions, and detectors the outputs of which are used to calculate the actual operating timings of the functions. The act... | 12/01/1998 |
| 5346381 | Apparatus for preparation of samples for spectrographic analysis An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is position... | 09/13/1994 |
| 5198241 | Apparatus for preparation of samples for spectrographic analysis An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is position... | 03/30/1993 |
| 5023535 | High resolution pulse width modulation An electrohydraulic servo system in which a microprocessor-based controller directs a pulse width modulated control signal to a servo valve for controlling flow of hydraulic fluid therethrough. Duration of each half-cycle in the pulse width modulated cont... | 06/11/1991 |
| 4951549 | Digital servo valve system A novel digital servo valve system for use in displacing an actuator is capable of operating either in closed or open loop mode. The system includes a controller that compares computed values of actuator parameters with preselected parameter values and it... | 08/28/1990 |
| 4917213 | Power transmission An electrohydraulic control system that includes a plurality of electrohydraulic devices coupled to a remote master controller by a high-speed serial communication bus. The bus has a serial differential transmission line, and a control line for indicating... | 04/17/1990 |
| 4850261 | Non-contacting electro-pneumatic servo for vibration isolation A sensing system for a vibration isolation table. A sensor responsive to the position of the tabletop is spaced apart from the tabletop and provides an output corresponding to the position of the tabletop. The output is modified to provide a control signa... | 07/25/1989 |
| 4790234 | Fluidic power-assisted setting device A fluidic power-assisted setting device has a setting motor having an output torque; a threaded spindle supported for rotation; a spindle nut threadedly mounted on the spindle for linear displacement; a setting member attached to the spindle nut for linea... | 12/13/1988 |
| 4777798 | Universal control system for hydraulic cylinders A universal control system for hydraulic cylinders to enable controlled increments of movement for varying uses including shaping members and lifting and lowering of loads. The lift control system is utilized to synchronize the raising or lowering of a lo... | 10/18/1988 |
| 4770081 | Servomechanism with idle gear feedback A servomechnism made up of a relatively small number of components has a pintle that is moved back and forth by a hydraulic actuator, an input member disposed opposite to the pintle and capable of reciprocating parallel with the pintle, a spool capable of... | 09/13/1988 |
| 4767292 | Electrical commutation apparatus A fluid motor having a gerotor gear set includes a first member having internal teeth and a second member having external teeth. The second member is rotatably and orbitally mounted within the first member. The teeth of the first and second members cooper... | 08/30/1988 |
| 4765225 | Digitally controlled air-over-hydraulic actuator and method A digitally controlled air-over-hydraulic actuator includes a pneumatic cylinder and a hydraulic cylinder each having a separate piston and a common connecting rod. The pneumatic piston applies force to the connecting rod urging movement of the hydraulic ... | 08/23/1988 |
| 4757747 | Power transmission An electrohydraulic system includes a plurality of electrohydraulic devices individually controlled by on-board microprocessor-based control electronics. Each individual device controller is connected to and addressable by a master controller for coordina... | 07/19/1988 |
| 4730541 | Non contacting electro-pneumatic servo for vibration isolation A sensing system for a vibration isolation table. A sensor responsive to the position of the tabletop is spaced apart from the tabletop and provides an output corresponding to the position of the tabletop. The output is modified to provide a control signa... | 03/15/1988 |
| 4516469 | Electric hydraulic controll device for a construction vehicle An electric hydraulic control device for controlling hydraulic cylinders of work tools in a construction vehicle, in which control valves of the hydraulic cylinders are controlled in two ways. For some work tools which need not be controlled smoothly and ... | 05/14/1985 |
| 4137824 | Remote shifter for vehicle transmissions Primary switches in bus cab, for instance, activate contacts in secondary switch group in rear transmission compartment to energize solenoids selectively pressurizing opposed cylinders to drive transmission shift operation to various positions.... | 02/06/1979 |
