FR3063394A1 - PROVISIONAL CONNECTION CLAMP - Google Patents

Abstract

The invention relates to a forceps (1) for temporary connection comprising a lower jaw (2) and an upper jaw (3) pivotally mounted on the lower jaw to clamp in use a support such as a rail, the connection clamp (1 ) comprising a clamping member (11) of two first ends (4, 5) of the jaws (2, 3), the clamping member comprising a screw (12) clamping between the two jaws at the two respective second ends (13, 14) of the jaws opposite the first ends of said jaws, the clamping screw being a multi-threaded screw.

Description

(54) PLIERS for temporary connection.

(57) The invention relates to a clamp (1) for temporary connection comprising a lower jaw (2) and an upper jaw (3) pivotally mounted on the lower jaw for clamping in service a support such as a rail, the clamp connection (1) comprising a clamping member (11) of two first ends (4, 5) of the jaws (2, 3), the clamping member comprising a clamping screw (12) extending between the two jaws at level of the two second respective ends (13,14) of the jaws, opposite the first ends of said jaws, the clamping screw being a multi-threaded screw.

The invention relates to a temporary connection clamp. In particular, but not limited to, the connection clamp is intended to be temporarily secured to a rail.

TECHNOLOGICAL BACKGROUND OF THE INVENTION

In the railway sector, a catenary ensures the electrical supply of the train or the tram.

For maintenance operations, it is of course necessary to cut off the electrical supply at the section of the catenary on which it is desired to intervene.

However, in order to improve the safety conditions in which workers work, it is also compulsory to also isolate the section on which one wishes to work. To this end, two poles are arranged respectively on either side of said section between the catenary and the rails in case of accidental refilling of the section, the two poles allow circulate ensures workers.

thus to short-circuit a current which otherwise in the section under maintenance. The security of

Such poles usually include a contact cable between a head connected to the catenary and a connection clamp connected to the rails.

OBJECT OF THE INVENTION

The invention aims to provide a temporary connection clamp which can be fastened and separated quickly and easily.

PRESENTATION OF THE INVENTION With a view to achieving this aim, a provisional connection clamp is proposed comprising a lower jaw and an upper jaw pivotally mounted on the lower jaw for clamping in service a support such as a rail, the clamp connection comprising a clamping member of two first ends of the jaws, the clamping member comprising a clamping screw extending between the two jaws at the level of the two respective second ends of the jaws, opposite the first ends

said bit, the clamping screw being a screw mulfi- nets. So, he an operator suffices to act sure the opinion to squeeze the first two ends against a

support to be connected to the clamp in order to secure the clamp and support.

This allows easy and quick assembly, in particular because of the multi-threaded appearance of the screw.

The inventors have thus been able to observe that a single turn of the screw could suffice to secure the connection clamp according to the invention to the support and so as to ensure this connection even in the presence of high intensity passing through the clamp. Conversely, a single turn is enough to separate the clamp from the support.

According to a particular embodiment, the screw comprises between two and five threads.

According to a particular embodiment, the screw comprises three or four threads.

According to a particular embodiment, the pitch of each thread of the screw is between 90 and 190 millimeters.

According to a particular embodiment, the pitch of each thread of the screw is between 100 and 175 millimeters

According to a particular embodiment, the clamping member of the first two ends of the jaws comprises a spring element arranged on the screw so as to cause a closure of the first two ends of the jaws, the spring element comprising at least one Belleville washer.

According to a particular embodiment, the spring element comprises between 2 and 8 Belleville washers.

According to a particular embodiment, the first end of one of the jaws comprises a plurality of teeth having a height between

1.3 and 2.2 millimeters.

particular embodiment, the between 1.5 and 2 millimeters.

According to a particular embodiment, the teeth are shaped like a diamond point.

Other characteristics and advantages of the invention will emerge on reading the following description of a particular non-limiting embodiment of the invention.

According to a mode of height of the teeth is

DESCRIPTION OF THE FIGURES

The invention will be better understood in the light of the description which follows with reference to the figures of the appended drawings in which:

FIG. 1 is a side view of the connection clamp according to a particular embodiment of the invention,

FIG. 2 is a top view of the clamp illustrated in FIG. 1,

- Figure 3 is a sectional view of the connection clamp illustrated in Figure 1 once in position on a rail.

DETAILED DESCRIPTION OF A PARTICULAR EMBODIMENT OF THE INVENTION

Referring to Figures 1 and 2, the connection clamp 1 according to a particular embodiment of the invention is here intended to be hung on a rail R. This application is of course not limiting and we can hang the clamp connection 1 to other supports such as for example to a switchgear core.

The connection clamp 1 thus comprises a lower jaw 2 and an upper jaw 3 pivotally mounted on the lower jaw 2 so as to allow the clamping of a base B of the rail R between a first end 4 of the lower jaw 2 and a first end 5 upper jaw

3. The upper jaw 3 is pivotally mounted on the lower jaw 2 around a first pivot 6 of axis X. The first pivot 6 here extends substantially at the center of the upper jaw 3 and of the lower jaw 2.

The upper jaw 3 comprises at its first end 5 a wheel 7 pivotally mounted on the first end 5 of the upper jaw 3 around a second pivot 8 which here extends parallel to the axis X. The wheel 7 typically has a knurled surface to improve its adhesion to the R rail.

The lower jaw 2 also comprises a plate 9 arranged at its first end 4, plate 9 provided with a plurality of teeth 10 (only part of which is referenced).

Said teeth 10 here have a specific height of between 1.3 and 2.2 millimeters.

Surprisingly, it has been found that such a height of the teeth 10 makes it possible to limit a risk of fusion of said teeth 10 in the event of an electric shock, due for example to an accidental re-energization of a section of a catenary that the connection clamp 1 aims to secure. In this way, the connection clamp 1 improves the contact between the connection clamp 1 and the rail R even in the presence of high intensity.

The height of the teeth 10 is advantageously not too great so that the connection clamp 1 retains a relatively small volume.

More precisely here, the height of the teeth 10 is between 1.5 and 2 millimeters.

The teeth 10 are all identical here. In particular, the teeth 10 are shaped like a diamond point.

The connection clamp 1 also comprises a clamping member 11 of the two first ends 4, 5 of the jaws 2, 3 one towards the other.

To this end, the clamping member 11 comprises a clamping screw 12 extending between the two jaws 2, 3 at the second ends 13, 14 respective of the jaws 2, 3, ie the ends opposite those 4, 5 respectively carrying the knurled wheel 7 and the plate 9. The tightening member 11 furthermore comprises an operating arm 15 of said screw 12 so that it is easier for an operator to screw or unscrew the screw 12 in order to distance the first two ends 4, 5 of the jaws or bring them together.

The screw 12 is a multi-threaded screw.

Typically, the screw 12 comprises between 2 and 5 threads. Preferably, the screw 12 comprises between 3 and 4 threads.

This advantageously makes it possible to have to turn the screw 12 only on a single turn to ensure the connection between the connection clamp 1 and the rail R.

The connection and disconnection of the connection clamp 1 to the rail R is therefore quick and easy.

The pitch of each thread of the screw 12 is identical. The screw 12 has here, for each thread, a pitch of between 90 and 190 millimeters and preferably between 100 and 175 millimeters.

The screw 12 here has three threads each having a pitch of 175 millimeters.

According to a preferred embodiment, the clamping member 11 comprises at least one Belleville washer 16 arranged on the screw 12 between the two second ends 4, 5 of the two jaws 2, 3. Typically the clamping member 11 comprises between 2 and 8 Belleville washers (only one being referenced here) and for example six Belleville washers.

AT this effect , the opinion 12 behaves a seat 17 arranged at level of the part of screw 12 located between both second ends 13, 14. The washers of

Belleville 16 thus rests on said seat 17. The lower jaw 2 correspondingly comprises an orifice 18 formed in the lower jaw 2 to receive said seat 17 when the screw 12 is completely screwed and that the first two ends 4, 5 are in a position where they are furthest from each other.

Furthermore, the screw 12 has a stop 19 arranged directly above the series of Belleville washers 16 on the portion of the screw 12 located between the two second ends 13, 14. The tightening member 11 is thus shaped so that the stop 19 permanently presses a corresponding surface of the second end 14 of the upper jaw 3 under the action of the Belleville washers 16.

The clamping member 11 is thus shaped so that the Belleville washers 16 are prestressed so as to tend to bring the two jaws 2, 3 closer to their first ends 4, 5.

Thus, even if the teeth 10 were to merge due to an electric shock, the stacking of the Belleville washers 16 would limit a risk of detachment of the lower jaw 2 of the rail R by keeping the first two ends 4, 5 pressed together. in the direction of the other and therefore keeping pressed the first two ends 4, 5 on the base B of the rail R.

In service, the connection clamp 1 is in the open position (as illustrated in FIG. 1) with the seat 17 in place in the corresponding orifice 18 of the lower jaw 2 and the first ends 4, 5 separated by one 1 ' other.

The operator then places the clamp 1 around the base B so as to surround the base B between the first two ends 3, 4.

The operator then unscrews the screw 12 with the help of the operating arm 15 until the base B is pressed between the first two ends 4, 5 (as visible in FIG. 3). This causes the base B to be clamped between the two jaws 2, 3 so that the thumb wheel 7 rests on top of the base B and the plate 9 rests against the bottom of the base B.

Thus pinched by the connection clamp 1, the base B is made integral with the connection clamp 1 temporarily until the screw 12 is screwed.

In addition, it suffices to turn the screw 12 on one turn only to ensure this connection and so as to ensure this connection even in the presence of high intensity passing through the connection clamp 1.

Advantageously, the various Belleville washers 16 also press plate 9 and wheel 7 against each other. This makes it possible to protect the operator even further in the event of a particularly significant accidental refeeding which would even cause the teeth 10 to merge. The teeth 10 are moreover already dimensioned to limit such a risk and thus resist intensities which may range up to 72 kilo-amps, 40 milliseconds.

The invention is not limited to what has just been described but on the contrary encompasses any variant coming within the scope defined by the claims.

Thus, the clamp may include other elements than what has been described as a hook connected to the lower jaw and intended to extend under the base of the support to grip at its free end the other side of the base of the support.

Although here the spring element comprises Belleville washers, the spring element may include other members such as for example a spring.

The teeth may have a height different from what has been indicated and therefore included outside the range 1.3 and 2.2 millimeters.

The screw may be different from what has been described and thus present three threads each having a pitch of 150 millimeters or else a four thread screw each having a pitch of 100 millimeters.

Claims (10)

1. Clamp (1) of temporary connection comprising a lower jaw (2) and an upper jaw (3) pivotally mounted on the lower jaw to clamp in service a support such as a rail, the connection clamp (1) comprising a clamping member (11) of two first ends (4, 5) of the jaws (2, 3), the clamping member comprising a clamping screw (12) extending between the two jaws at the level of the two second ends ( 13, 14) respective of the jaws, opposite the first ends of said jaws, the clamping screw being a multi-threaded screw. claim 1, in comprises between two and five 2. Clip according to which the screw (12) threads. 3. Clip according to which the screw (12) threads. claim 2, in includes three or four 4. Pliers according to one of the preceding claims, in which the pitch of each thread of the screw is between 90 and 190 millimeters. 5. Pliers according to claim 4, in which the pitch of each thread of the screw is between 100 and 175 millimeters 6. Pliers according to one of the preceding claims, in which the clamping member (11) of the two first ends (4, 5) of the jaws (2, 3) comprises a spring element arranged on the screw so as to cause a closing the first two ends of the jaws, the spring element comprising at least one Belleville washer (16). ίο 7. Pliers according to claim 6, in which the spring element comprises between 2 and 8 Belleville washers (16). 8. Pliers according to one of claims 5 above, wherein the first end of one of the jaws comprises a plurality of teeth having a height of between 1.3 and 2.2 millimeters. 9. Pliers according to claim 8, in 10 which the height of the teeth (10) is between 1.5 and 2 millimeters. 10. Pliers according to one of claims 8 or 9, wherein the teeth (10) are shaped like a diamond point. 1/1