FR2468154A1 - ELECTRIC CONTROL DEVICE COMPRISING A CONTROL LEVER - Google Patents

Abstract

Electrical control device comprising a control lever provided with a head capable of tilting from a neutral position in both directions against restoring forces, and a signal generator actuated by the head and which outputs depending on the direction of movement, an electrical control signal, in particular for controlling solenoid valves. The signal generator is a differential sensor 21 dependent on a magnetic field and comprising two detector members fixedly mounted in the control lever 3 and an exciter member 20 movable with the aid of the head so as to influence the magnetic field of the members. detectors, the exciting member 20 being carried by a tongue of a leaf spring 14 fixed with at least one branch to the control lever near the detector members.

Description

Electric control device comprising a control lever. The

  present invention relates to an electrical control device comprising a control lever provided frontally with a head capable of tilting about an axis perpendicular to the axis of the lever and movable by limited angular intervals from a position

  neutral in both directions against counter forces

  pel, and a signal generator actuated by the head and which delivers according to the direction of movement a signal

  for electrical control, in particular for controlling electrical

trovalves.

  In a known control device of this kind, the control lever can be made to tilt from its neutral vertical position in a first plane of the two sides so as to actuate a control potentiometer respectively, and in a second plane also in the

  two directions so as to actuate respectively a potentio-

  additional control meter. the head that can be tilted with the thumb carries two capable springs each

  activate a miniature switch fixedly mounted in the

  vier command. Thus six different valves can be controlled which allow for example in a hydraulic device to carry out the movement towards the left and towards

  right, forward and backward motion and movement

  ascending and descending. In this case the switches

  miniature tutors may, however, only issue si-

  constant command signals. Often it is however

  desirable to be able to continuously vary all the functions

ordering.

  The present invention creates a device for

  demand of the kind described above but in which the general

  head-activated signal generator capable of

  culer is capable of delivering control signals

continuously.

  The solution to this problem following the pre-

  sente invention is that the generator of si-

  gnaux is a differential sensor depending on a ma-

  genetic and comprising two detector elements mounted fi-

  xes in the control lever so as to be offset

  relative to each other in the tilt direction-

  ment of the head and an exciter movable by means of the head and influencing the magnetic field of the detector organs and in that a leaf spring is fixed with the

  minus one branch to the control lever near the or-

  Detector ganes, being mounted with its front side op-

  placed on the head, and carries the exciter organ on a lan-

  lookout extending next to said branch.

  A differential sensor thus arranged allows, in

  limited space pit available in the handle of a le-

  control, to generate a dependent control signal

  from the tilting angle of the head and therefore variable

  continuously. Under these conditions the leaf spring serves as a

  gane transmitting the movement in a certain relationship and which adapts the deviation to communicate to the excitation organ

  to produce a signal magnitude determined by motion

  the actual tilting of the head. As an ex-

  citator can be used for example a permanent magnet

  or, if the magnetic voltage is produced at another end

  straight, also a simple piece of soft iron.

  Preferably, the leaf spring has two branches

  between which the tongue is arranged. We ob-

  thus holds a symmetrical construction operating from

very precisely.

  the tongue is advantageously shorter than the

  plugged. This allows to multiply the rocking movement

  lement of the head so as to allow angles of low-

  relatively large, which facilitates

  attempt a very sensitive control, while the movement of the exciter member nevertheless corresponds to the usual dimensions of a differential sensor usable for this purpose.

  In addition, the length of the branches must be at most

  mum equal to 75%, preferably about 60%, of the long

  leaf spring. It therefore remains between the

  branches or the tongue, on the one hand, and the front edge op-

  placed, on the other hand, a relative leaf spring part-

  long, uninterrupted and therefore relatively rigid. So the transmission ratio of

  movement can be fixed very easily.

  According to a preferred embodiment the organ-

  nes detectors of the differential sensor depending on a magnetic field are field plates. This allows

a very compact construction.

  It is therefore advisable that the exciter is a piece of soft iron and that the field plates are joined with a permanent magnet. the iron piece

  soft can be relatively small so that its fixing

  tongue is no problem. The magnet per-

  manent which is relatively large in comparison to the gold-

  exciter gane is fixedly mounted in the control lever

  so that it does not pose problems of congestion.

  According to an embodiment economically

  very advantageous the detector elements of the different sensor

  are derived from a magnetic field are genera

Hall effect sensors.

  Another variant consists in that the detector members of the differential sensor depending on a field

  magnetic are induction coils.

  The invention is explained in more detail below with the aid of an exemplary embodiment illustrated in the appended drawing in which: FIG. 1 is a side view of an electrical control device to which the invention is applicable. FIG. 2 is a vertical section on a larger scale of the handle of the control lever of FIG. 1; Figure 3 is a side view of a leaf spring used in the handle of the control lever of Figure 2;

  Figure 4 is a side view of the lower part

  of a differential sensor used in the handle of the control lever of FIG. 2; and

  FIG. 5 is a top view of FIG. 4.

  The electrical control device 1 of the figure

  1 comprises a control lever 3 provided with a handle 2.

  You can tilt the control lever 3 around

  from a point 4 both in the plane of the drawing and perpendicular to

  lairement to this one. In the case of the rocking movement-

  ment mentioned first can be actuated for example two potentiometers for the forward and backward movement of a hydraulic device. In the case of the second tilting movement cited, for example, two potentiometers can be actuated for the movement of this device to the left and to the right. On the front side of the control lever is a head 6 capable of tilting

  around an axis 5 and the tilting movement of which

  puts to produce other continuously variable control signals, for example for the movement of the device up and down. Head 6 has an extension

  7 extending inward beyond the rocking axis-

  ment 5 and on the outside of which are mounted two return leaf springs 8 and 9. These are supported

  on stops 10 and 1t which are mounted fixed in the-

  control plate 3. This ensures the neutral position of the head 6. The extension also has a knife holder 12 in which engages a front edge 13 of a leaf spring 14. The latter has two branches 15 and 16 whose lower ends 17 and 18 are

  firmly fixed in the control lever 3. In-

  tr these branches is a tongue 19 which carries at its end on each side an exciter member 20 made of soft iron. This exciter is part of a sensor

  field plate differential 21 of which the lower part--

  re 22 is fixedly mounted in the control lever 3. The mounting

  tage is carried out using a carrier element 23 which receives

  the lower part 22, carries the stops. 10 and 11 and pre-

  feels the clamping equipment for branches 15 and 16 of the

leaf spring 14.

  Figures 4 and 5 show the lower part

  22 of a known field plate differential sensor for

  before being used in the context of the present invention.

  Two detector members 24 and 25 produced as a plate

  -which field are arranged side by side offset in the tilting direction of the head 6. The detector members 24 and 25 are each constituted by an element

  semiconductor whose nhmic resistance varies under the

  fluence of a magnetic field. Normally these plates

  field are crossed by equal magnetic flux pro-

  duits using a permanent magnet 26. These magnetic fluxes

  ques vary inversely when the organ excited

  tor 20 moves away from the middle position between the detector members. If the detector members are mounted in two branches of an ohmic bridge, it is possible depending on the movement of the exciter member 20 to take a voltage

  sinusoidal control which moves on both sides of the po-

  neutral position roughly proportional to the angle of

  tilting. Terminals 27, 28 and 29 are used for connection

  necessary conductors. The top of the organs

  tectors is covered with a protective layer.

  When, during operation, the head 6 is caused to tilt in the clockwise direction, the knife 12 moves in the case of FIG. 2 to the left, thereby causing the leaf spring 14 to bend.

  sagging occurs mostly in the bran-

  ches 15 and 16. Since the tab 19 does not participate

  not to this sag, it protrudes from the right side

  outside the leaf spring 14. Under the conditions dimension-

  nelles illustrated the exciter 20 therefore moves

  to the right. So, for example, a displacement of the sup-

  knife holder 12 of 4 m = - leads to an opposite deflection of the exciter 20 about 0.6 mm. This command is very precise since the exciter member 20 is fixedly mounted on the tongue and there is no play

  disruptive anywhere in the system.

  The transmission ratio of the movement can be changed in a simple way by varying the slots

  between the branches 15, 16 and the tongue 19.

  Similar conditions are obtained by using as detector elements 24 and 25 not field plates but Hall effect generators or induction coils.

Claims (6)

  1 - Electric control device comprising   a control lever provided frontally with a suscep-   tible to tilt about an axis perpendicular to the axis of the lever and movable by angular intervals limited to   from a neutral position in both directions against   be restoring forces, and an ac signal generator   actuated by the head and which delivers an electrical control signal as a function of the direction of movement, in particular for controlling solenoid valves, characterized in that the   signal generator is a differential sensor (21)   pendant from a magnetic field and comprising two detector members (24, 25) fixedly mounted in the control lever (3) so as to be offset with respect to each other   in the direction of tilting of the head (6) and an or-   exciter gane (20) movable by means of the head and   influencing the magnetic field of the detector organs and   that a leaf spring (14) is fixed with at least one branch   che (15, 16) to the control lever. proximity to the detector members, being mounted with its opposite front side (13) on the head, and carries the exciter member (20) on   a tongue (19) extending next to said branch.   2 - Control device according to the claim   tion 1, characterized in that the leaf spring (14) has two branches (15, 16) between which the tongue (19).   3 - Control device according to the claim   tion 1 or 2, characterized in that the tongue (19) is   shorter than the branches (15, 16).   4 - Control device according to any one   claims 1 to 3, characterized in that the length   branch heat (15, 16) is at most equal to 75%, of   preferably about 60% of the length of the leaf spring.   - Control device according to any one   claims 1 to 4, characterized in that the organs   detectors (24, 25) of the differential sensor (21) dependent   of a magnetic field are field plates.   6 - Control device according to claim, characterized in that the exciter member (20) is a piece of soft iron and the field plates are joined with a permanent magnet (26). 7 - Control device according to any one   claims 1 to 4, characterized in that the organs   detectors (24, 25) of the differential sensor (21) dependent   of a magnetic field are Hall effect generators.   8 - Control device according to any one   claims 1 to 4, characterized in that the organs   detectors (24, 25) of the differential sensor (21) dependent   of a magnetic field are induction coils.