CH223127A - Hydraulic remote control device. - Google Patents

Description

Hydraulic remote control device. The subject of the present invention is a hydraulic remote control device comprising at least one transmitter station provided with a control member, and a receiver station provided with a control member.

The object of the invention is to provide such a device which makes it possible to reproduce at a distance, on a control member, the movement of a control member, and by the simple operation of which one can automatically carry out the compensation. losses, expansions or contractions which may occur in the hydraulic circuit, so that a given position of the control member practically corresponds to an analogous and well-determined position of the control member.

The device which is the subject of the invention is caraet@ris6 in that it comprises two pipes, each of which actively intervenes for a direction of displacement of the aforesaid control and control members, and in that in the event of accidental lack of liquid in one of these pipes, a communication is established between the two pipes, towards the end of the stroke only of one of the said organs, by means of a tank of the station to which this organ belongs, at the continuation of a maneuver of the control member carried out with the aim of counting the filling of the said carialization, so that the continuation of the movement of the other of these members determines the restoration of the normal filling of the said pipe , so that each Position of the control member corresponds to an analogous Position of the control member.

In a preferred embodiment, this communication can be established through pistons sliding in cylinders into which the two aforesaid pipes would open, and this thanks to valves which would be kept normally closed by an elastic force and opening , at the end of the exchange of the corresponding control and control devices, by abutment against fixed parts.

Figs. 1 and 2 of the appended drawing show, by way of example, two embodiments of the device according to the invention.

First device according to fig. 1 comprises a transmitter station cz and a receiver station b. Since these two stations are of similar construction, the corresponding parts of each of them have been designated by the same reference number, this number being followed by the index a when it is a question of the transmitter station and of the index b in the case of the receiving station.

Only one of the posten will be described, the transmitter a. This station comprises a block the dann which are bored two cylinders 2a, 3a. In the cylinder 2a can move two pistons 4a and 6a, and in the cylinder 3a two pistons 5a and 7a. The pistons of the same cylinder are rigidly joined by a cylindrical wall 8a, respectively 9a, with a diameter smaller than that of the cylinders.

Lights 10a, 11a are made radially in the walls 8a, 9a, and place chambers 12a, 13a which these walls define, in communication with the space comprised between the said walls 8a, 9a and the cylinders 2a, 3a. . Said space is in communication with a reservoir 14a, common to the two cylinders of the station, by ports 15a, 16a. In order to give the posts a compact shape, this reservoir is preferably formed along a cylindrical ring surrounding one of the cylinders, 2a at the transmitter and 31) at the receiver, in the example shown.

Orifices 1'7a, 18a are practiced in the pistons 4a, 5a. They are normally closed by a valve 19a, 20a subject to the action of a spring 21a, 22a respectively, acting towards the exterior of the transmissions, that is to say upwards in the figure.

By elongated notches 23a, 24a, made in the walls 8a, 9a, fixed spacers 25a, 26a, integral with the block ja, enter the chambers 12a, 13a. The pistons of the two cylinders of the station are recirculated. by a pendulum system comprising rods 27a, 28a articulated on a sector 29a monM pivoting around a fixed axis 30a. On the first sector 29a of the transmitter station is fixed a control button 31a-, on the first corresponding switch 29u of the receiver station is fixed a finger 31u joined to the organ to be controlled.

lies cylinders 2a and 2b are connected by a Y pipe, while the eylindres 3a and 31> are min in communication by a Z pipe.

The operation of the device shown is as follows: Under normal conditions, if arm 31a is moved by a certain angle in one direction or the other, arm 31b moves by the same angle, in magnitude and direction, due to the double hydraulic link present between the two posts.

Normally, the corresponding pistons, that is to say 4a and 4b, on the one hand, 5a and 5b, on the other hand, occupy symmetrically opposite positions in their cylinder, so that i a given position of the arm 31a corresponds to a determined position of the arm 31b, which is identical to that of the arm 31a in the example represented in the figure.

If, however, for any accidental reason whatsoever: leaks, expansions or contractions of the liquid, for example, a shift occurs between the positions of the arms 31a and 31b, the device makes it possible, by its only operation, to restore the uni vocal correspondence of positions, leaks, expansions or contractions of the liquid being automatically compensated due to the communication that exists between the pipes and the reservoirs.

In particular, if a leak, expansion or co-pressure of liquid occurs for a position in which the valves 19 and 20 are closed, the device is such that simply by its operation an can cause the compensation of this leak, etc. .

Assuming, for example, that a loss has occurred in channel Y and that the organs of the device are in a position close to Gelle shown in fig. 1, but for which however the valves 19 and 20 are closed, it suffices to carry out the following maneuver to ensure the compensation of this leak and to restore the unequivocal correspondence of the positions of the Organs of the two stations.

<I>First</I> time: 0n brings the lever 31a of the transmitter back to the position indicated in fig. 1, by moving in the opposite direction of the arrow. The piston 5a forces the pistons 5b and 4b to come to the bottom of their stroke, in the position shown, the pipe 2 being full.

<I>Second</I> time: Lever 31a is then actuated in the 1st direction of the flecke. Due to the lack of fluid in the line Y, the first piston 4a sinks i first without causing lifting of the piston 4b. During this Phase, the rise of piston 5a, mechanically linked to piston 4a, creates a depression below said piston 5a; the valve 20a is detached from its seat under the action of the pressure of the liquid contained in the reservoir 14a and a certain quantity of the liquid passes through it, so as to keep the pipe Z full, the excess liquid thus introduced being Exactly equal to the amount leaking in line Y.

If, from this moment; an continues the first movement of the lever 31a, the two pistons 4a and 4b move together, as well as the pistons 5b and 5a, and this until the pistons 4a and 5a reach their extreme position, respectively low and high , before the pistons 4b and 5b have reached the end of their stroke.

Third step: 0n rotates the first lever 31a in the opposite direction to that of the flecke marked in the figure. Pistons 4a and 4b, 5a and 5b first move together, but pistons 4b and 5b reach the end of their stroke before pistons 4a and 5a. During the continuation of the maneuver, after this end of stroke arrival, the first liquid returned by the first piston 5a passes through the first piston 5b (due to the detachment of its seat from the valve 20b, the rod of which abuts against the spacer 26b ), the orifices 16b and 15b, lifts the first valve 19b and reaches the pipe Y.

At the end of this third stage, all the excess liquid introduced into the pipe Z during the first stage has been transferred into the pipe Y. The two pipes thus regain their degree of rem. - normal pleating and the identity of the positions of the arms 31a and 31b is RTI ID="0003.0275" WI="13" HE="3" LX="1383" LY="645"> restored.

A leak in Z would be compensated by a similar reverse manoeuvre.

It should be noted that the two stations play an absolutely symmetrical role and that the receiver becomes a transmitter and vice versa, without any modification of the device.

In practice, it is frequently necessary to be able to ensure, at will, the control of a receiving station, alternately by means of several independent transmitting stations (two for example), under conditions such as the action of The command exercised by any one of the transmitting stations has an effect only on the receiving station and does not, on the other hand, exert any influence on the other transmitting station(s).

Control devices of this kind are particularly necessary on self-propelled car trains, in which a motor must be able to be controlled from a front position or from a rear position, depending on the direction of movement of the vehicles.

Currently, in gas of this kind, the driver, to neutralize the position which is not in control service, must operate valves interposed on the pipes connecting this position to the engine, or, in other systems, he must ensure the blocking of a lever or other similar organ of this position.

The embodiment shown in FIG. 2 is provided with the aim of avoiding manipulations and consequently eliminating the inconveniences that may result from their accidental omission; it makes it possible to control a receiving station alternately by means of two or more transmitting stations, without the action of any one of these transmitting stations having any effect on the other transmitting station(s). - tors.

In the example according to fig. 2, two transmitter stations Ta, Tb must be able to alternately control a receiver station R, under conditions in which the control member L of this latter station occupies at all times a position homologous to that of the control member, either La or Lb.

At the output of each of the transmitter stations Ta and TI? is interealed, On the outputs 1, 2 and 3, 4 coming from these stations, an irreversibility box 5.

Each irreversibility box contains a floating piston p which normally occupies an average position in the box. Valves q, s are mounted on corresponding seats, fixed inside the box, beyond the outlet of pipes 1 and 2 with respect to the middle of the box.

These valves q, s are capable of opening in opposite directions by moving away from this mi- licu.

The extreme compartments <I>t,</I> u of the box communicate with the genoral pipes Y, Z connecting the two transmitter stations and On which the first receiver station P is mounted in derivation by pipes 6, 7 .

The operation of this second form of execution is as follows: If Fon acts, for example, on the first lever La Jans in the first direction of the arrow f, the first liquid discharged into pipe 2, on the one hand, opens the first valve <I>q </I> and, on the other hand, pushes back the piston <I>p</I> in the direction of the arrow, so that the valve s also opens. Consequently, the liquid discharged into the pipe 2 has accA through the channel Y and the derivation 6 into the cylinder on the right of the receiver R, so that the control lever L reproduces, in a homologous manner, the movements of the lever La. In addition, the liquid, driven back A from the left cylinder of receiver B, by the very action of this receiver, can; through pipes 7 and Z, enter compartment u, then, with the valve open, pass through pipe 1 and into the right cylinder of transmitter station Ta. The circulation of the liquid therefore takes place under conditions absolutely analogous to those which have been described in relation to FIG. 1, but it is easy to see that the first Tb transmitter station remains off, since the first liquid quo discharged into the Y and Z pipes forms the q and s valves of this Tb station. The control action of Ta therefore exerts no influence on Tb.

Similarly, the control of the receiving station R by Tb exerts no influence on Ta.

Finally, when, ceasing to control the receiver station by one of the transmitters, for example by the first station Ta, when trying to control the receiver station by the other transmitter station Tb, the control unit Lb and 1 The control member L does not necessarily occupy homologous positions at this instant. It is then difficult to ensure this resynchronization by causing the control member Lb to complete a round trip s. At the end of this stroke, the organs L and Lb necessarily occupy homologous positions and the control of the First by the second can take place under regular conditions. Of course, during this resynchronization manoeuvre, the other transmitter station Ta has not ceased to remain outside the circuit. .

Although the example considered above relates to the cis of two transmitting stations associated with a single receiving station, it is clear that the irreversibility boxes can be applied, with the same results, to devices comprising more than two transmitter stations mounted in parallel On the Y and Z channels.

The applications of these irreversible control devices are multiple; an can cite, for example; the throttle control of an engine from several cockpits.

In the case of a transmitter station only, the irreversibility box would ensure the irreversibility of the command.

Claims (6)

CLAIM Hydraulic remote control device, comprising at least one transmitter station provided with a control member, and a receiver station provided with a controlled member, characterized in that it comprises two pipes each of which intervenes actively for a direction of movement of the aforementioned control and controlled members, and in that in the event of an accidental lack of liquid in one of these pipes, communication is established between the two pipes, towards the end of travel only of one of said members, via a reservoir of the station to which this member belongs, following an operation of the control member carried out with the aim of completing the filling of said pipe. so that the continuation of the movement of the other of these members determines the re-establishment of the normal filling of the said pipe, so that each position of the control member corresponds to a similar position of the controlled member. 1. Device according to claim, characterized in that the transmitter and receiver stations each comprise a pair of cylinders in each of which is capable of moving a piston, each of the two pipes being provided to connect them one of the cylinders of the various stations, means being further provided for automatically switching on the liquid reservoir of each station when one of the control and controlled organs is at least approximately in an extreme position. 2. Device according to claim and sub-claim 1, characterized in that spring valves are mounted in the head of the aforesaid pistons, a stop member being provided to be met by each of these valves, at the end of stroke of the corresponding piston towards the outside of the station, a capacity being provided inside each piston and communicating with a passage controlled by the corresponding valve, orifices being made in the body of said pistons to communicate said capacities with the liquid tank of the corresponding station. 3. Device according to claim and sub-claims 1 and 2, characterized in that it comprises a pendulum connection between the pistons of each station. 4. Device according to claim and sub-claim 1, characterized in that it comprises an irreversibility box, connected between the two aforesaid pipes and each transmitter station, a floating piston being arranged in this box, on both sides. on the other of which open conduits going to the two cylinders of the station, two valves actuated respectively by the two opposite faces of said piston being provided to control the passage between these conduits and compartments external to these valves, respectively connected to the two above-mentioned pipes . 5. Device according to claim, ca acterized in that its various positions are connected: in parallel on the two aforesaid pipes. 6. Device according to claim and sub-claims 1, 4 and 5.