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AssigneePoclain Hydraulics Industrie
InventorsBernard Allart, Louis Bigo, Jean-Pierre Camilleri, Jacques Fontaine, Mariele Legai, Louis Martin
Estimating the term…
A cylinder-capacity selector for a hydraulic motor having at least two active operating cylinder capacities and comprising having at least two main ducts. The selector includes three ports and distribution ducts of the motor to establish selective communication between the main ducts and the cylinders of the motor. When the selector passes between its first and second stable positions, in at least one displacement direction, an intermediate stage exists that is maintained for a lapse of time, during which all three ports are in communication and the section of at least one of the passages between the first and second ports and between the second and third ports of the selector is constricted.
A selector device for selecting the cylinder capacity of a hydraulic motor having at least two active operating cylinder capacities, the motor comprising at least two main ducts respectively constituting a fluid feed duct and a fluid exhaust duct, the selector device comprising a slide placed in a bore into which at least three communication ports open out, suitable, via distribution ducts of the motor, for establishing selective communication between the main ducts and the cylinders of said motor, a third communication port being designed to be connected to one of the main ducts of the motor, the device having selector means which, in a first stable position of the slide, put a second communication port into communication with the third communication port via a passage between the second and third ports, while isolating said second and third ports from a first communication port, and which in a second stable position of the slide, put the second communication port into communication with the first communication port via a passage between the first and second ports while isolating said first and second ports from the third communication port, the selector means being constituted in such a manner that during displacement of the slide between said stable positions, there exists a temporary situation in which both the passage between the first and second ports and the passage between the second and third ports are open simultaneously;
A selector device for selecting the cylinder capacity of a hydraulic motor having two active operating cylinder capacities, the device comprising three groups of distribution ducts and having two main ducts respectively constituting a fluid feed duct and a fluid exhaust duct, the distribution ducts of the first group being permanently connected to one of said main ducts, while the distribution ducts of the third group are permanently connected to the second of said main ducts, the cylinder-capacity selector device comprising a slide placed in a bore having three communication ports respectively designed to be permanently connected to each of the three groups of distribution ducts, the selector slide being suitable for being displaced in said bore between a first stable position of small cylinder capacity, the device having selector means which, in the first stable position, put the first and third communication ports into communication via a passage between the second and third ports, while isolating the first communication port from said second and third ports, and which in the second position of the slide, put the first and second communication ports into communication via a passage between the first and second ports while isolating the third port from said first and second ports, said selector means being constituted in such a manner that during displacement of the slide between said first and second positions of the slide, there exists a temporary situation in which both the passage between the first and second ports and the passage between the second and third ports are open simultaneously;
Dependencies are inferred from the claim text.