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WO/1997/004253A1 |
The description relates to a safety circuit for the alternating running of consumers, e.g. gear components of a power shift gear, and a proportional valve for such a safety circuit, in which the proportional valve can preferably be elect...
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WO/1996/035077A1 |
In a device (66) for safeguarding a CNC-controlled electro-hydraulic drive unit (11) against the disengagement owing to a fault of its moving part (18) from a stationary position in which it should be possible to conduct manual operation...
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WO/1996/027741A1 |
In a hydraulic controller, in order to easily provide a hydraulic back-up in the event of a failure of an electric system while maintaining a benefit of electrical control using a control unit (13) when controlling a displacement of a hy...
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WO/1996/015326A1 |
During manual operation, pilot pressure discharged from a pilot pump (41) is fed from a manual operation valve (44a) or (44b) through an electromagnetic change valve (49a) or (49b) to a main control valve (33). During automatic operation...
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WO/1996/010698A1 |
A device for driving a hydraulically controlled main valve (10) a first pilot valve (11) and a second pilot valve (12) for the same side of the main valve (10). Each pilot valve has a control oil inlet (17, 18), a control oil outlet (15,...
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WO/1996/001954A1 |
A control circuit for controlling a combined emergency shutdown and process protection (safety) system, especially on board platforms and vessels. There are two separate signal generators which, each by means of a control line (10, 17) o...
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WO/1995/033929A1 |
A safety switch is disclosed for electrohydraulically regulating a lifting mechanism. If deviations from the norm are detected at the main regulating valve when the regulation system starts to operate, locks are activated which allow the...
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WO/1995/023925A1 |
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 provi...
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WO/1995/023958A1 |
An apparatus and method for detecting a leak in a closed, fluid transfer system, specifically a hydraulic system, by comparing the actual rate of fluid level change in the fluid reservoir to the rate of fluid level change computed from t...
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WO/1995/013043A1 |
A hydraulic system is proposed for the hydraulic operation of a height-adjustable ambulance lifting platform (H) for a stretcher which can also act as a suspension system. The system comprises a cylinder (Z) for operating the lifting pla...
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WO/1994/027052A1 |
When a solenoid proportional valve (91A) of a direction control valve (8A) is left open due to failure and an operator makes a reverse lever operation for operating an operation lever (4A) in an x2 direction, a low level signal is output...
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WO/1991/019108A1 |
The invention concerns a double-acting piston cylinder (10) in which the piston movements are transmitted by a displacement sensor (14) to an electronic control system (16). Acting on the piston rod (13A) is a mechanical brake (46). The ...
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WO/1991/004169A1 |
A control device for hydraulic working cylinders with a hydraulic medium pump (1) driven by a motor (2) which can be caused to communicate with a chamber of at least one lifting cylinder (11) and at least one lock cylinder (14) of the lo...
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WO/1990/002267A1 |
This invention relates to an oil pressure feeder which can prevent the abrupt fall of a work machine at the time of breakage of a piping arrangement for supplying a pressurized oil to a work machine cylinder and which can make the loweri...
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WO/1988/004367A1 |
The second stage (10) of a fail-fixed flow-control servovalve has a five-lobed valve spool (12) slidably mounted in a body bore (19). At null, the end lobes (41, 45) are substantially zero-lapped with respect to supply pressure slots (22...
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WO/1987/002427A1 |
A fault detector for a triplexed mechanical or hydromechanical system has a tripodal summing member (10, 60) which receives three mechanical position signals (18, 20, 22, 61-63) in three different channels with the tripodal summing membe...
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WO/1985/000204A1 |
Improvement to electro-fluidic relays susceptible of indicating either the maximal or the minimal threshold of pressure of a fluid circuit or the position of a movable member of a jack. The relay is comprised of a connector (1, 2) secure...
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WO/1984/001333A1 |
A relatively expensive, relatively heavy, and relatively nonflammable hydraulic fluid (chlorotrifluorethylene) is used in an aircraft ground wheel brake system between the piston (72) of a deboost device (68) and a set of wheel brakes (1...
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WO/1983/001604A1 |
Disclosed is a safety latch cylinder (48) for a tiltcab truck (10). The safety latch cylinder (48) comprises a hydraulic cylinder extension of which unlatches a cab latch mechanism (46) and a bypass to tank (30) through the hydraulic cyl...
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WO/1982/002229A1 |
A mechanism (80) is provided to controllably lower an actuator (28) upon the loss of a source (62) of pilot fluid in a fluid system requiring a float condition of operation. A resolver (80) is located in a vent line of a make-up valve an...
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WO/1982/000862A1 |
Hydraulic fluid powered actuation system for controlling the position of a control surface (162) of an aircraft in response to a plurality of redundant control signals. The system comprises a tandem actuator (10) adapted to be mounted in...
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WO/1981/003689A1 |
A fluid power control system (17) having an improved control valve (20) providing reduced regulated pressure fluid selectively from a high pressure pump supply (P) or the fluid motor (10) under conditions wherein the pump supply has fail...
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WO/1981/003685A1 |
A fluid system (10) having a directional control valve (12) operated by a pilot valve (11) having a manually operable control handle (22) for selectively controlling a fluid motor (14) in positioning a load (17). The pilot valve (11) inc...
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WO/1981/003527A1 |
A hydraulic piston cylinder device comprising a cylinder (1), a piston (2) dividing the cylinder into two cylinder spaces (A and B), and valve elements (7, 9) between the cylinder spaces (A and B) and the respective pressure medium pipes...
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JP6694480B2 |
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JP6689525B2 |
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JP6683641B2 |
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JP6681039B2 |
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JP2020051585A |
[Subject] When operating a winding-up motor and a run motor simultaneously in a hydraulic system which can supply operation oil via a run motor on a winding-up motor, a hydraulic system which can prevent pressure with both outlet sides f...
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JP2020045924A |
[Subject] It is not concerned with the surrounding temperature and a kind of actuator, but abnormalities of an actuator are detected using displacement time of a flexible region. [Means for Solution] Processing which a malfunction detect...
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JP6670167B2 |
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JP6659476B2 |
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JP6654521B2 |
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JP2020026826A |
[Subject] A hydraulic drive of an operating machine which can reduce the number of times of a maintenance is provided. [Means for Solution] It is a controller (20) opening the 1st opening-and-closing valve (25a), closing the 2nd opening-...
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JP2020026845A |
[Subject] Abnormalities in a fluid leak detection system are diagnosed. [Means for Solution] Measurement unit 10 for fluid leak detection system 100 to detect a leak of operation oil of oil pressure cylinder 1, Having controller 80 which...
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JP6643393B2 |
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JP2020020397A |
[Subject] Control an erroneous decision of a clog of an operation oil filter by difference in a flow of operation oil which flows through an operation oil filter, and provide an operating machine which can judge a clog of an operation oi...
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JP2020020421A |
[Subject] Irrespective of size of a leak flow rate of a relief valve, a hydraulic drive which can measure a leak flow rate of a hydraulic pump correctly is provided. [Means for Solution] Controller 30 keeps the amount of discharge flow o...
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JP6641852B2 |
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JP6640619B2 |
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JP6636875B2 |
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JP6636795B2 |
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JP6622566B2 |
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JP2019210952A |
To prevent interruption of a work caused by failure while preventing increase in size of an air compressor.An air compressor 10 includes: a motor 13 driving a compression part; a control part 16 controlling the motor 13; air tanks 17, 18...
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JP2019210091A |
To provide a turning driving device that can ensure suppression of the entry of a turning body into a work limited area and issue an appropriate warning to an operator.The turning driving device comprises: a neutral brake-type control va...
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JP6618398B2 |
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JP6616675B2 |
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JP2019199897A |
To enhance efficiency of fluid leakage detection in a fluid pressure cylinder.A fluid leakage detection system 100 includes a measuring unit 10 for detecting leakage of working fluid through an annular gap 8 between a piston rod 3 and a ...
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JP2019199896A |
To enhance efficiency of fluid leakage detection in a fluid pressure cylinder.A fluid leakage detection system 100 includes a measuring unit 10 for detecting leakage of working fluid in a hydraulic cylinder 1, and a controller 80 for acq...
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JP2019194484A |
To improve the detection accuracy of a fluid leakage detection system.A fluid leakage detection system 100 comprises: a detection space 20 into which hydraulic fluid leaking from a rod seal 11 sealing an annular clearance 8 between a pis...
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