FR2609803A1 - DEVICE FOR CONTROLLING COMPRESSION SPRINGS - Google Patents

Abstract

THIS DEVICE, IN PARTICULAR INTENDED TO CONTROL THE INCLINATION OF THE SPRING ENDS, INCLUDES TWO SPACES 14, 25 PROVIDED WITH A CERTAIN MUTUAL DISTANCE AND MOUNTED ON CARDAN JOINTS, BETWEEN WHICH A COMPRESSION SPRING CAN BE STRAINED. THE AXLES OF THE CARDAN SUSPENSION ARE EACH EQUIPPED WITH A ROTATION ANGLE SENSOR 17, 18; 23, 24 WHICH TRANSMITS THE INCLINATION OF THE CORRESPONDING RANGE 14, 25 AND WHICH RESULTS FROM THE INCLINATION OF THE CORRESPONDING END OF THE SPRING TO A COMPUTER FOR ANALYSIS. IN THIS WAY, THE INCLINATION OF THE SPRING ENDS, WITH OR WITHOUT LOAD, CAN QUICK, PRECISE AND OBJECTIVE MEASURE.

Description

The invention is based on a control device for springs of

  compression. Up to now, the inclination of the ends of the springs has been controlled in the relaxed state, by mechanical and optical methods. This cannot give information on the inclination behavior of the springs under load. According to the invention, the device for controlling compression springs, in particular intended for controlling the inclination of the ends of a spring, with or without load, is characterized in that each of the two ends of the spring is supported on a bearing mounted by a Cardan joint and in that each Cardan joint is associated with a rotation angle sensor whose measurement results are analyzed in a computer. This device has, compared to already known devices, the advantage of making it possible to perform a quick, precise and objective measurement of the inclination of the ends of the springs in the state

tense and relaxed.

  According to another characteristic of the invention, the lower span can be locked in a position exactly

horizontal.

  Other characteristics and advantages of the invention

  will be better understood on reading the description which follows

  of an exemplary embodiment and with reference to the attached drawings on which:

  Figure 1 is a simplified representation, in elevation

  tion, a device for controlling springs; Figure 2 is a perspective view of a Cardan suspension; Figures 3 and 4 are respectively a side view

and a top view of a room.

  The device comprises a base plate 10 which is connected by several vertical columns 11 to a transverse plate 12. A support frame 13 is mounted adjustable in height on the base plate 10. A bearing surface 14 is mounted on the support frame by an articulation of Cardan and, more precisely, in a double cross 15, the two axes 15A and 15B of which intersect, rotate in the carrying frame 13. The axis 15A carries a rotation angle sensor 17, while the axis 15B, who carries the litter

  14, is provided with a rotation angle sensor 18. The lower end

  of a compression spring 20 (the object to be checked)

builds on scope 14.

  The upper Cardan suspension is of identical construction. It is located in a support frame 21 which is mounted movable in translation in the cross-plate 12 and on which the control load acts. The Cardan suspension comprises a double cross 22 having the two axes 22A and 22B which intersect, on each of which is mounted a rotation angle sensor 23 or 24, respectively. The axis 22B is connected to the upper span

  to shoot with it. The upper end of the compression spring

  pressure 20 is pressed against the upper surface 25.

  For the precise positioning of the springs to be checked,

  adjustable jaws 26 are arranged on the surfaces 14, 25 -

  in Figures 3 and 4, there is shown the bearing surface 14. The inclination of the ends of the compression spring 20 is transmitted to the plates 14, 25 constituting the bearing surfaces. The corresponding rotation of the bearings 14, 25 if the ends of the spring are inclined - is transmitted to a computer by the angle of rotation sensors 17, 18 and is analyzed. The supporting frame 13 is adjustable in height to compensate for the differences in length

different springs.

  With the device described, it is possible to simultaneously control

  ment the inclination of the two ends of a spring. Otherwise,

  it is possible to measure the deviations from the cylindrical form

  drique. The measurement plane is in the middle of the staves.

  The analysis of the difference, in size and direction, is ensured by the use of a computer. The ranges 14, 25 are mass compensated in the measuring range, so that there is no alteration of the measured values. It is advantageous to provide a

  locking device for the lower support frame 13.

  Of course, various modifications may be made by those skilled in the art to the device which has just been described solely by way of non-limiting example without departing from the

part of the invention.

Claims (6)

  1. Control device for compression springs, in particular for controlling the inclination of the ends of the springs, with or without load, characterized in that each of the two ends of the spring is supported on a mounted support (14, 25) by a Cardan joint and in that, with each Cardan joint, is associated a rotation angle sensor (17, 18; 23, 24) whose measured values are analyzed in a computer.   2. Device according to claim 1, characterized in that the carrying frame (13) which receives one of the spans (the span 14) is adjustable in height.   3. Device according to claim 1 and / or claim 2, characterized in that the carrying frame (21) which receives the other bearing (25) can be moved in translation by the control charge.   4. Device according to one of claims 1 to 3,   characterized in that the device has two base plates (10, 12) opposite one another, which are joined together by columns (11).   5. Device according to one of claims 1 to 4,   characterized in that, on the surfaces (14, 25), are arranged centering jaws (26).   6. Device according to claims 1 to 5, characterized   in that the lower bearing (14) can be locked in a exactly horizontal position.