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Patent Searching and Data


Matches 351 - 400 out of 3,171

Document Document Title
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...  
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...  
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...  
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...  
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,...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
JP6694480B2  
JP6689525B2  
JP6683641B2  
JP6681039B2  
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...  
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...  
JP6670167B2  
JP6659476B2  
JP6654521B2  
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-...  
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...  
JP6643393B2  
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...  
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...  
JP6641852B2  
JP6640619B2  
JP6636875B2  
JP6636795B2  
JP6622566B2  
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...  
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...  
JP6618398B2  
JP6616675B2  
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 ...  
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...  
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...  

Matches 351 - 400 out of 3,171