FR2561966A1 - Device for holding flanges in the clamped position on parts intended to be immobilised - Google Patents

Abstract

Device for holding flanges in the clamped position on parts intended to be mobilised, characterised in that it comprises a body 1 of elongate shape, made internally so as to receive a first means equipped with a striking surface area having a limited axial movement capability; and a second means which can also move axially in height in the opposite direction communicating the thrust effect in order to come into bearing abutment on the flange to be clamped; the said body being made internally with a circuit for the flow of a fluid serving as a transmission means for the thrust efforts of the first means to the second means, means being provided to allow the fluid to be maintained under pressure or be recycled.

Description

 The invention relates to a device for holding the clamping position of flanges on parts intended to be immobilized.

 The bot sought after according to the invention was to produce a simple device easily transportable and usable for clamping the parts.

 According to a first characteristic, the device for holding the clamping position of the flanges on parts intended to be immobilized is remarkable in that it comprises a body (1) of elongated shape, arranged internally to receive a first means provided with an area. impact with limited axial displacement capacity; and a second means which can also be displaced axially in height in the opposite direction by communicating the pushing effect to come into abutment bearing on the flange to be tightened; said body being arranged internally with a fluid flow circuit serving as a means of transmitting the thrust forces from a first means to the second means, means being provided to allow the pressure to be maintained under pressure, or its recycling.

 These characteristics and others will emerge clearly from the following description.

To fix the subject of the invention illustrated in a nonlimiting manner in the figures of the drawings where:
Figure 1 is a schematic view illustrating the use of the device according to the invention for clamping a workpiece.

 FIG. 2 is a view in longitudinal section of the device along the line A-A of FIG. 3.

 Figure 3 is a view of dess / us in partial section along the line S-B of Figure 2, some parts having been removed to facilitate understanding of the device.

 FIG. 4 is a sectional view along line c-c of FIG. 3.

In order to make the object of the invention more concrete, it is described in a nonlimiting manner illustrated in the figures of the drawings.
The device comprises a body (1) of elongated shape and flared preferably at first to receive a first means provided with a striking area and a second means capable of moving axially in height to come into abutment on the lower end of a clamping flange (B). It is supported by its other end on the part to be clamped, a tie T being disposed on the flange with support on the base plane (Figure 1).

As illustrated in Figures 2 and 3, the body has in its rear part and perpendicular to its horizontal longitudinal plane; a blind hole (2) in which is engaged the aforementioned first means capable of receiving a shock according to the arrow
F. This means comprises a piston (3) sliding sealingly in said hole while being guided by a ring (4) disposed externally on the upper face of said body (1). The piston rod (3) projects outwardly and is associated at its end with a cap (5) or the like, the upper surface (51) of which forms the striking area.

The bottom of said blind hole is filled with a fluid (FL). As illus tré figure 3, this hole (2) communicates in its bottom part with two check valves (8-9) arranged horizontally on either side and in the thickness duli. body (1). These valves are mounted in an appropriate manner to define a direction of circulation of the fluid. Each valve includes a stepped lower body (81) (91) opening into channels (8Z-83) and (92,93) communicating in the. blind hole .: (2)
A spring (10-11) and a ball (12-13) are mounted in opposite directions in the seat parts (84 ~ 94) of said valves. The first valve (8) is extended by a conduit (14) opening into a chamb (C) disposed in the body part, said chamber being arranged to receive a seal the second means ensuring the abutment of the flange.

This circular chamber receives a hollowed out ring (15) provided on its periphery with various sealing joints, the bottom face of the ring being oriented towards the bottom of the body and serving as the contact face (151) of the fluid coming from the channel. ejection (14). The body (1) has in its upper part (11) surrounding said chamber an internal shoulder allowing the centering and the fixing of a cover (16) supported externally and internally. The cover has an axial opening (161) for the passage and the guiding of a cylindrical block (17) forming a piston which bears on the inner bottom (152) of the ring (15). A return spring (18) is disposed on said block and rests on the one hand on the inner bottom of the ring and on the other hand on the inner shoulder (162) of the cover. In the rest position the volume of fluid in the chamber (C) is such that a clearance J is provided between the end wall of the cover and the facing border of the ring. This clearance is established sufficiently to allow proper operation of the device as will be described later and correspond to the amplitude of movement of the ring and the piston to ensure the clamping and abutment function of the flange /
Fixing means (19) such as screws are provided for associating the cover (16) on the body.

 Furthermore, the return pipe circuit-comprises a second channel (20) from the aforementioned chamber C - and opening into a reservoir (21) established in the body between the aforementioned members.

The reservoir (21) is in the form of a shouldered cylindrical housing capable of receiving in its upper part a cover (22). The reservoir communicates by its bottom with the channel (20) and with a second channel (23) leading to the non-return valve (9) A ball (24) is disposed in the flared mouth of the conduit (20) in connection with the tank. This ball is held by a locking screw (25) bearing on the ball, said screw passing through the cover (22) being suitably guided>) and being able to be adjusted in position manually.

 In the lower part of the body, under the tank are provided two bypass conduits (26) with a drain plug (27) of the fluid.

 It is now necessary to describe the operating mode of the device of the invention. When the operator wishes to ensure the clamping of a part, after positioning the device under the flange (Figure 1), he exerts a striking force (F) on the first means and therefore the piston (3). The effect thrust thereof thus causes the compression of the fluid in the bottom of the ring hole (2) and the evacuation of the fluid by the first non-return valve (8) into the chamber (C). beforehand in order to maintain the pressure, the locking screw (25) was brought into firm support on the ball (24) thus closing the pipe (20) and preventing the fluid from returning to the second valve. Thus, the fluid enters the chamber (C) and causes the ring (15) to move against the spring (18) within the limits of the clearance initially provided according to arrow F '. The movement of the ring itself causes the piston (17) to rise, which abuts on the flange. The pressure is maintained by closing the circuit between the first non-return valve (8) and the ball (24).

 When it is desired to cancel the effort and therefore the pressure, it suffices to unscrew the locking screw (25) of the ball (24) thereby authorizing the flow of the fluid in the reservoir (21), said fluid then entering the second non-return valve against the ball (13) then in the bottom of the blind hole (2) for a new cycle.

 The advantages emerge clearly from the invention in particular the simplicity of the device and its ease of implementation are emphasized. It can be made in any shape, any size to adapt to the fittings needed for various types of clamping.

Advantageously, the ratio between the face F and its resultant
F 'is calculated so as to be approximately from 1 to 16. A very weak force thus generates significant effects.

 It is reported that the device according to the invention avoids the conventional system for packaging the flanges disposed at the rear of a part and the abnormal tightening of the tie rod.

 The operator positions the body with in particular the thrust piston (17) under the clamp to be tightened, then performs the above operation.

It should be noted that no particular tightening effort of the nut on the tie rod is necessary unlike the prior art.

 The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts having been more especially indicated; on the contrary, it embraces all its variants.

Claims (6)

-1- Device for holding the clamping position of the flanges on parts intended to be immobilized, characterized in that it comprises a body (1) of elongated shape, arranged internally to receive a first means provided with a striking area having a limited axial displacement capacity; and a second means which can also be displaced axially in height in the opposite direction by communicating the pushing effect to come into abutment bearing on the flange to be tightened; said body being arranged internally with a fluid flow circuit serving as a means of transmitting the thrust forces from the first means to the second means, means being provided for allowing the pressure to be maintained under the fluid, or its recycling. -2- Device according to claim 1 characterized in that the body (1) has in its rear part and perpendicularly a blind hole (2) in which is engaged and guided the first means said means comprising a piston (3) sliding sealing in said hole (2) and whose rod (31) projects outside of said body, being associated with a cap (5), the upper surface (51) of which forms a striking area; the bottom of said hole (2) being filled with a fluid. -3- Device according to claim 2 characterized in that said blind hole EZ) communicates in its bottom part with two check valves (8-9) arranged horizontally and in the thickness of said body, the valves being arranged internally for allow a circulation of the fluid in a particular direction from the first means to the second means and return by a pipe apn required. -4- Device according to claim 1 characterized in that the body is arranged in its front part with a circular chamber (c) shouldered at its upper part receiving the second means for sealing; said second means consisting of a hollow ring (15) whose bottom face is oriented towards the bottom of the body and serving as a contact face for the fluid coming from the ejection channel (14); a cylindrical block (17) forming a piston being engaged in an axial opening (161) of a cover centered on the shoulder of the chamber (C) and coming to bear on the interior bottom of said ring (15), a spring of reminder mounted around the piston block being positioned between the ring and the cover, the assembly being mounted so that in the non-use position a clearance (J) is defined between the inner wall of the cover and the facing border of the ring, this clearance defining the amplitude of axial displacement of the ring and the piston. -5- Device according to claims 1, 2, 4 together characterized in that a second channel (20) from the chamber C and opens into a reservoir (21) established in the body, between the first and second means; this tank (21) in the form of a shouldered cylindrical housing for the reception of a cover (22) also communicating through its bottom with a second channel (23) leading to the non-return valve C9); a ball (24) being disposed in the flared mouth of the conduit (20) in connection with the reservoir and being held in position by a locking screw (25) guided and passing through said cover (22) to ensure from the outside a manual adjustment. -6- Device according to claim 5 characterized in that in the lower part of the body under the tank are provided two bypass pipes (26) with a fluid drain plug.