FR2738632A1 - Marking device for screw spindle - Google Patents

Abstract

The stack of Belleville (RTM) rings (3) is arranged in the tubular component (1) and with its one end is in contact with the first locating surface (4). A compression component (2) is so arranged that it slides inside the tubular component and has a second locating surface (5), which is in contact with the other end of the ring stack.The tubular component and the compression component have a third (9) and a fourth (8) locating surface, which are so arranged that they accommodate the locating surfaces of two compression components (6, 7). Devices (1,3, 15) are provided which determine the penetration depth of the compression component in the tubular component

Description

CALIBRATION DEVICE

OF A COMPRESSION CYLINDER

  The present invention relates to a device for calibrating a compression cylinder; There are many occasions when we wish to measure the strength of

  compression exerted by a jack, using simple and robust means.

  This is particularly the case in the area of scaffolding, used

  to especially on building sites when renovating building facades.

  We know that these scaffolds are placed on the ground and stabilized by fixing them to screw jacks blocked in the windows of the facade windows. It is therefore important that these cylinders exert on the surfaces on

  which they are supporting sufficient force.

  It is therefore customary to periodically tighten these jacks. However, it is also important that this force does not reach a value that could damage the wall on which the scaffolding is mounted. There is therefore a need for a means enabling the effort exerted by

  these jacks on the surfaces on which it is supported.

  The present invention aims to provide such a means.

  To this end, the invention relates to a device for calibrating a compression actuator, characterized in that it comprises a tubular member having inside its first support surface, a stack of Belleville washers arranged in said tubular member with one end of said stack in contact with said first abutment surface, a compression member arranged to slide inside said tubular member and having a second bearing surface in contact with the other end of said stack washers, said tubular member and said compression member respectively having a third and a fourth bearing surface arranged to receive the abutment surfaces of two compression elements, and means being provided for locating the level

  driving the compression member into the tubular member.

  In a particular embodiment, said compression member comprises a tubular part arranged to slide inside said

stack of washers.

  Such an arrangement ensures proper guiding of the

  compression inside the tubular organ.

  Said locating means may comprise a locating finger integral with one of said tubular and compression members, arranged to move opposite the other of said members. More particularly, said locating finger can be mounted on said compression member and be arranged to slide in a window formed in said tubular member and along which is inscribed a

measuring scale.

  Said compression member may also be tubular, said bearing surfaces of said tubular and compression members being produced

  in the form of annular shoulders on these said organs.

  We will now describe, by way of nonlimiting example, a particular embodiment of the invention, with reference to the schematic drawings [15 appended in which: - Figure 1 is a view in axial half-section of a device according to the invention; and

  - Figure 2 is an elevational view along arrow 11 of Figure 1.

  The device according to the invention essentially comprises an external tubular member 1, an internal tubular compression member 2, and a stack of Belleville washers 3 disposed between the members 1 and 2. The washers 3 are supported on the one hand on a shoulder 4 of the member 1 and on the other hand on a shoulder 5 of the member 2. The member 2 can therefore slide inside the member 1 by more or less compressing the stack of washers 3. An O-ring seals between organs 1 and 2 of

to isolate the washers 3.

  This sliding against the action of the elastic washers 3 takes place under the action of two compression elements, here one end 6 of a compression cylinder and one end 7 of a tube, the other ends of which are for example in support on the two lateral surfaces of a window embrasure not shown. The end 6 of the compression cylinder comes to bear on a shoulder 8 of the member 2 and the end 7 of the tube is in support

on a shoulder 9 of the member 1.

  The member 1 simply consists of a tube provided inside the two shoulders 4 and 9 and knurled outside. Organ 2 includes a

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  first part 10 provided with two shoulders 5 and 8, and a second guide part 11, integral with part 10, this second part itself being guided by an inner annular rib 12 of member 1

  bounded by shoulders 4 and 9.

  A cylindrical locating finger 13, on which a flat part 14 is formed, is screwed to the outside of the part 10 of the member 2. The free end of this

  finger is engaged in a window 15 formed in the wall of the member 1.

  When the member 2 slides in the member 1, the locating finger 13 moves in front of a graduated scale 16 engraved in the external wall of the member 1 at the edge of the window 15. The scale 16 is for example graduated in kilograms-force on one side and in pounds per square inch on the other side to indicate, depending on the position of the finger 13, and therefore of

  the crushing of the washers 3, the force exerted by the jack.

  In addition, in the position shown in the drawings, the finger 13 maintains the member 2 in the member 1 when no force is exerted

on the device.

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Claims (4)

  1- Calibration device for a compression cylinder, characterized in that it comprises a tubular member (1) having inside a first bearing surface (4), a stack of Belleville washers (3) arranged in said tubular member with one end of said stack in contact with said first support surface, a compression member (2) arranged to slide inside said tubular member and having a second support surface (5) in contact with the other end of said stack of washers, said tubular member and said compression member respectively having a third (9) and a fourth bearing surface (8) arranged to receive the bearing surfaces of two compression elements ( 6,7), and means (13,15) being provided for locating the level   driving the compression member into the tubular member.   2- Device according to claim 1, wherein said compression member comprises a tubular part (11) arranged to slide at   the interior of said stack of washers.   3- Device according to any one of claims 1 and 2, in   which said locating means comprise a locating finger (13) integral with one of said tubular and compression members, arranged to be   move vis-à-vis the other of said members.   4- Device according to claim 3, wherein said locating finger is mounted on said compression member and is arranged to slide in a window (15) formed in said tubular member and along   which is inscribed with a measurement scale (16).   - Device according to any one of claims 1 to 4, in   wherein said compression member is tubular, said bearing surfaces of said tubular and compression members being made in the form   of annular shoulders on these said organs.