ES2552092T3 - Road network equipment equipped with a safety device for at least one device cover - Google Patents

Abstract

Road network equipment for roadway registration comprising at least one cover (2) mounted articulated with tilting on the side (3) of a support frame (1) by means of at least one hinge (4) of articulation between a closed position of the support frame (1) and an approximately vertical open position of this frame and, for each cover (2), a safety device comprising a self-locking arm (16) of which one of the ends is pivotally mounted on the side (3) of the frame (1) around a pivot axis (9) and the other end is connected to the cover (2) by means of a shaft (18) integral with the cover (2) and slidably mounted on a light ( 19) longitudinal oblong of the arm (16) self-locking to allow the rotation of this arm around its pivoting axis (9) during the swinging of the cover (2) between its opening and closing positions and to block so automatic cover (2) in its raised opening position, c characterized in that the axis (18) of attachment of the arm (16) self-locking to the cover (2) comprises two adjacent cylindrical parts respectively of smaller (22) diameter and of greater (23) diameter and is axially movable with respect to the cover ( 2) by the action of an elastic member (27) requesting the part (22) of smaller diameter of the connecting shaft (18) in sliding coupling in the oblong light (19) of the self-locking arm (16) during the tilting of the cover (2) between its two opening and closing positions and the part (23) of greater diameter of the coupling joint shaft (18) locked in a circular hole (19a) of the end of the self-locking arm (16) in prolongation of the light (19) oblong to this arm when the cover (2) is brought to its elevated opening position.

Description

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DESCRIPTION

Road network equipment equipped with a safety device for at least one device cover

The present invention relates to a road network equipment comprising at least one articulated mounted cover with tilting on a support frame by means of at least one articulation hinge.

It applies to roadway records.

In such an application, the frame is permanently sealed on the floor and one or more articulated covers with respect to the frame can occupy a closed position in which the covers seal the opening enabled in the frame or an open position in the that the covers rise approximately vertically to free the opening of the frame.

In general, each road registration cover is very heavy due to its construction with cast iron-based material, specifically spheroidal. In this way, covers of this type are difficult to maneuver during their tilting between the closing and opening positions of the frame and, in addition, when they occupy their opening position, they can accidentally tilt to their closing position of the frame.

European document FR-A-2 674 879 describes a safety device for at least one articulated road registration cover comprising, for each registration cover, a lever of which the lower end is articulated on the registration frame and The upper end is provided with a longitudinal oblong light in which an extension of the axis of articulation of a rod of an aid jack for opening the lid slides. This lever is provided at its upper free end with a hook articulated on this lever and which becomes attached under a finger of the axis of articulation of the rod of the help jack at the end of the opening movement of the lid.

A lever with an interlocking hook of this type allows the lid to be installed in its raised opening position without the risk of accidentally tilting the lid to its closed position.

However, this known safety device has the disadvantage that it requires that the different elements that constitute it be mounted precisely in the frame and in the cover of the register so that, during pivoting the cover to its position of opening, the free end of the lever provided with the hook can intersect the rotating path of the finger of the axis of articulation of the rod of the help jack, otherwise the hook cannot fit under this finger. In addition, to close the opening of the frame by means of the cover, the hook must be manually pivoted to its unlocked position around its articulation axis at the free end of the lever, which requires first and foremost by the operator a relatively important effort to swing the lid slightly backwards. A road network equipment according to the preamble of claim 1 is known, moreover, by European document EP 1013833 A.

The present invention aims to alleviate the drawbacks of above known security devices.

For this, the invention proposes a road network equipment according to claim 1.

In the position of locking the lid in its opening position, the larger diameter part of the joint shaft can be released from the circular hole of the self-locking arm by means of a tension manually exerted on the joint shaft against the return force exerted by the elastic organ on the joint axis to arrange the part of smaller diameter in front of the oblong light of the self-locking arm and allow the lid to swing towards its closed position.

The cylindrical parts of smaller diameter and larger diameter of the joint shaft are connected to each other by a projection held in support on a corresponding face of the self-locking arm by the elastic organ when the cylindrical part of smaller diameter is coupled in the light oblong of the self-locking arm, and the joint axis consists of a flange adjacent to the cylindrical part of greater diameter on the opposite side of the cylindrical part of smaller diameter and which is held in support by the elastic member on the corresponding end face of the self-locking arm consisting of the circular hole when the lid occupies its locked opening position.

The joint shaft is axially supported by means of a fork of the lid and of which an end part that protrudes from one side of the fork consists of the two adjacent cylindrical parts of different diameters.

The connecting shaft is mounted axially slidably on a cover integral to the fork of the lid and of which an end part located on the same side as the two adjacent cylindrical parts is suitable for receiving the cylindrical part of smaller diameter of the joint shaft when its larger diameter part is coupled in the circular hole of the self-locking arm with the connecting shoulder between these two cylindrical parts butting on the free end of the end part of the sheath by the action of the elastic member.

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The self-locking arm moves in rotation around its pivot axis between the connecting shoulder and the free end of the end portion that protrudes from the sheath.

The cover is fixed to the fork by means of a nut coupled on an externally threaded part of the end part protruding from the cover and a head integral with the opposite end of the cover and supporting the corresponding branch of the fork.

Preferably, the elastic member is a helical compression spring mounted coaxially around an end part of the connecting shaft that projects from the fork on the opposite side of the end part of this axis consisting of the two cylindrical parts of different diameters and that is prestressed between the sheath and a nut fixed at the free end of the corresponding end part of the joint shaft.

According to a variant embodiment, the sheath is fixed to the fork by means of two integral nuts of an externally threaded part of the sheath and which imprisons the fork branch opposite the other branch adjacent to the self-locking arm.

According to this variant embodiment, the elastic member is a helical compression spring mounted coaxially around an end part of the connecting shaft that protrudes from the fork on the opposite side of the end part of this axis consisting of the two cylindrical parts of different diameters and which is prestressed between one of the nuts fixing the sleeve to the fork branch and a nut fixed at the free end of the corresponding end part of the joint shaft.

The equipment advantageously comprises a grip grip integral to the end of the joint shaft and which allows traction on this axis to release the larger diameter part of the circular hole of the self-locking arm.

The joint axis is parallel to the pivot axis of the self-locking arm on the side of the frame and the pivot axis of this arm is disposed below the hinge of articulation of the cover in the frame.

The equipment also includes at least one support jack for opening the cover and pivotally mounted, on the one hand, on the side of the frame on the same pivot axis of the self-locking arm and, on the other hand, on the cover on a coaxial axis to the joint axis.

The aid jack is pivotally mounted around the sheath between the two branches of the fork.

As a variant, the equipment comprises means integral with the cover and suitable for laterally maintaining the self-locking arm when the part of greater diameter of the connecting shaft is released from the circular hole of the arm.

Advantageously, the equipment comprises a rigid label for support of the cover perpendicular to the latter.

The equipment of the invention is part of a roadway record.

The invention will be better understood, and other purposes, characteristics, details and advantages thereof will be shown more clearly in the explanatory description that will be followed with reference to the attached technical drawings given only by way of example that illustrate a mode of embodiment of the invention and in which:

- Figure 1 is a perspective view of a safety device of the invention for two road registration covers occupying their opening position; -Figure 2 is a perspective view similar to that of Figure 1 and representing the safety device

of a cover that moves to its closed position of the road registration frame; Figure 3 is a side view that follows the arrow III of Figure 2; -Figure 4 is a bottom view of the two road registration covers that occupy their closed position of the

framework;

FIG. 5 is a sectional view that follows the line V-V of FIG. 4 and according to which the safety device occupies the position that allows a corresponding lid to be tilted between its opening and closing positions;

-Figure 6 is a sectional view similar to that of Figure 5 and depicting the safety device in

its lid locking position in its opening position; Figure 7 is an enlarged view of the part surrounded with VII of Figure 1; Figure 8 is an enlarged view of the part surrounded with VIII of Figure 4; -Figure 9 is an enlarged view similar to that of Figure 7 and depicting a variant embodiment of the

invention; Figure 10 is a sectional view similar to that of Figure 6 and depicting another variant embodiment of the security device of the invention; and Figure 11 is a perspective view similar to that of Figure 7 and depicting the variant embodiment of Figure 9.

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The safety device to be described below applies to at least one road registration cover, but of course it can be applied to any cover or swing other than that of a road registration.

Referring to the figures, the road registration comprises a frame 1 and two covers 2 each having the general shape of a right triangle, mounted articulated on two opposite sides 3 of the frame 1 by means of articulation hinges 4, being provided two articulation hinges on one side of frame 1 for each cover

2.

As is known per se, each articulation hinge 4 comprises a horizontal axis 5 bearing a fork 6 integral with one side 3 of the frame 1 on the upper part of this side.

In this way, each cover 2 can swing around its two articulation hinges 4 with respect to the frame 1 between a closed position of the opening of the frame 1 and an open position of this frame.

In the closed position of the frame 1, the two triangulated covers 2 are adjacent by means of their hypotenuses.

Each cover 2 is associated with at least one aid jack 7 for opening the lid and, in the embodiment shown, two parallel jacks 7 are provided for opening the lid. Advantageously, each help cat 7 can be of the gas type.

The rod 8 of each jack 7 is pivotally mounted on an axis 9 fixed to a fork 10 integral with the corresponding internal face 3a of the side 3 of the frame 1, the axis 9 being located below the two hinges 4 of the lid articulation 2 of the frame 1. Of course, the pivot axis 9 of each rod 8 of the jack 7 is parallel to the axes 5 of the articulation hinges 4. As this best appears from Figure 8, the two ends 8a of the two jack shanks 7 are pivotally mounted coaxially around the axis 9 between the two branches 10a of the fork 10 with interposition between the two ends 8a of a sleeper 11 central. The pivot shaft 9 protrudes on both sides of the two branches 10a of the fork 10 and these two protruding end portions are threaded externally to allow the screwing of two opposite nuts 12 for fixing the shaft 9 to the fork 10.

The body 13 of each jack 7 is attached to the corresponding cover 2 and pivotally mounted by its end 13a around an X-X axis ’fixed to a support bracket 14 integral with the inner face of the corresponding cover 2. The two ends 13a of the jack bodies 13 are pivotally mounted between the two branches 14a of the fork 14 and are axially separated from each other by a central cross member 15. The pivot axis X-X ’of the bodies 13 of jacks 7 is parallel to the pivot axis 9 of the stems 8 of these jacks 7 which, in this way, extend in the same plane that passes through these two axes.

Of course, each jack 7 can be mounted in the opposite direction between the frame 1 and the associated cover 2 having, in this way, its body 13 pivotally mounted on the axis 9 and its rod 8 pivotally mounted on the X-X axis ’.

Each cover 2 is also associated with an arm 16 which allows the cover 2 to be automatically locked at the end of the opening movement.

The self-locking arm 16 has one of its ends which is pivotally mounted on the corresponding side 3 of the frame 1 around the pivot axis 9 of the two ends 8a of the cat shanks 8 7. To this end, the end of the self-locking arm 16 is pivotally fixed to the axis 9 by means of a screw 17 with a head fixed in a blind hole grounded on the axis 9 so that the end of the arm 16 is disposed between the screw head 17a and the corresponding locking nut 12 of the axis 9 on the fork 10.

The opposite end of the self-locking arm 16 is connected to the corresponding cover 2 by means of a shaft 18 integral with the cover 2 as will be seen later and which is slidably mounted in a longitudinal oblong light 19 of the self-locking arm 16 to allow the rotational drive of this arm around its pivot axis 9 on the side of the frame 1 during the swinging of the cover 2 between its opening and closing positions and to automatically lock the cover 2 in its approximately vertical opening position.

According to the invention, the axis 18 connecting the self-locking arm 16 to the cover 2 is axially movable along the axis X-X 'between the two branches 14a of the fork 14 in a fixed sheath 20 arranged concentrically around the axis 18 axially mobile.

The sheath 20 goes through the perforations of the two branches 14a of the fork 14 protruding on both sides of these. The cover 20 is fixed to the branches 14a of the fork 14, on the one hand, by means of a nut 21 screwed onto an externally threaded end part 20a of the cover 20 protruding from one of the branches 14a of the fork 14 on the side of the corresponding end of the self-locking arm 16 and, on the other hand, by means of a part 20b forming the head of the sheath 20 protruding from the other branch 14a of the fork 14 in front of it. The sheath 20 can be fixed to the fork 14 by the nut 21, and the part 20b that forms the head of the sheath following a slight axial clearance as shown in Figures 5 and 6, but can be fixed without play so that the nut 21 and the head-forming part 20b comes to rest on the external faces respectively of the two branches 14a of the fork 14.

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The two ends 13a of the cat bodies 13 and the cross member 15 are arranged concentrically around the sheath 20.

The connecting shaft 18 has a part that protrudes from the end part 20a of the sheath 20 consisting of two adjacent cylindrical parts 22, 23 respectively of smaller diameter and larger diameter and a part 24 forming a flange adjacent to part 23 of greater diameter on the opposite side of the part 22 of smaller diameter.

The shaft 18 extends beyond the part 24 that forms a flange by means of a threaded nozzle 25 to which a clamping handle 26, for example in the form of a bakelite sphere, is screwed.

The connecting shaft 18 also protrudes from the sheath 20 on the opposite side of the cylindrical parts 22, 23 of smaller diameter and larger diameter and a helical spring 27 is coaxially mounted around this part protruding from the axis 18 being prestressed between the part 20b that forms the head of the sheath 20 and a washer 28 coaxially mounted on this part that protrudes being axially retained by a nut 30, for example of the Nylstop® type, screwed onto a threaded end part outwardly at the end of the joint shaft 18. In this way, the spring 27 tends to return or axially attract the axis 18 of connection to the left with respect to Figures 5 and 6, that is, in a sense that tends to return parts 22, 23 of different diameters towards lock nut 21.

The part 22 of smaller diameter of the connecting shaft 18 has a diameter slightly smaller than the width of the oblong light 19 of the self-locking arm 16 and the part 23 of larger diameter has a diameter slightly smaller than the diameter of a circular hole 19a made in the arm end 16 self-locking in prolongation of light 19.

The part 22 of smaller diameter is connected to the part 23 of greater diameter by a bevelled shoulder 29.

The rigid self-locking arm 16 may be constituted by a flat bar consisting of a longilinear part 16a that comes out of its end consisting of the circular and extended hole 19a by means of a cushioned part 16b pivotally connected to the pivot axis 9. In any case, the self-locking arm 16 extends parallel to each of the two help jacks 7.

When each cover 2 occupies its closing position of the frame 1, the self-locking arm 16 and the two jacks 7 extend approximately in the same plane below the upper opening of the frame 1.

When each cover 2 is brought to the opening position by pivoting in the direction of the arrow F1 in Figure 3, it drives with it the two jacks 7 of which causes the extension to help the opening of the cover 2 and, during this pivoting , the self-locking arm 16 is rotated about the pivoting axis 9 with the part 22 of smaller diameter coupled in the light 19 oblong by the attraction of the spring 27, so that this part of smaller diameter of the joint axis 18 can slide in the light 19. In this way, the self-locking arm 16 moves during pivoting of the cover 2 between the free end of the end part 20a protruding from the cover 20 and the connecting stop 29 between the parts 22, 23 of smaller and larger diameter, as shown in Figure 5. This figure also shows that the spring 27 constantly attracts the stop 29 in support on the outer face of the self-locking arm 16 of which the inner face is in support s lock the free end of the cover 20.

When the cover 2 is at the end of the opening movement in an approximately vertical position, the part 23 of greater diameter, by the attraction of the spring 27, is automatically engaged in the circular hole 19a of the light 19 of the self-locking arm 16 and it is retained in this hole by the spring 27, as shown in Figure 6, which shows that the flanged part 24 is supported on the outer face of the end of the self-locking arm 16 of which the inner face is supported on the free end of the part 20a protruding from the sheath 20. This figure further shows that the part 22 of smaller diameter is housed in the sheath 20, this part of smaller diameter being able to correspond essentially to the nominal diameter of the joint shaft 18. In this way, the lever 16 locks the cover 2 in its opening position and prevents any accidental tilting of this cover towards its closing position of the frame 1.

When a user wishes to swing the cover 2 to its closed position from its opening position, it is sufficient to pull, with the help of the grip handle 26, the connecting shaft 18 to move it axially in the cover 20 compressing the return spring 27 to release the larger diameter part 23 of the hole 19a of the arm 16 to arrange the smaller diameter part 22 in the hole 19a in front of the light 19 and, slightly supporting the cover 2 in the direction of its tilting towards the frame 1, the part 22 of smaller diameter is coupled in the light 19 of the arm 16 allowing the swinging of the cover 2 to its closed position by the help of the jacks 7 with rotation movement of the arm 16 around the axis 9 of pivoting and displacement of the part 22 of smaller diameter by sliding in the light 19. The spring 27 attracts the stop 29 in support on the outer face of the arm 16 to constantly maintain the part 22 of smaller diameter in the light 19 during tilting of the lid 2.

Figure 9 represents a variant embodiment of the invention according to which means are provided for maintaining the self-locking arm 16 in its position in a vertical plane when the grip handle 26 is manipulated to exert a traction on the joint axis 18 in opening position of the lid 2 to bring it to its closed position.

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These maintenance means comprise a rigid flat pin 40 consisting at its upper end, considering FIG. 9, of a perforation, not shown, crossed by the connecting shaft 18 so that the latter can slide through the pin. 40. The upper end portion of the pin 40 is locked by pinching between the nut 21 and the corresponding branch 14a of the fork 14.

In the lower end part of the pin 40 a cylindrical shaft 41 is fixed perpendicular to the pin 40 and which passes through the light 19 of the self-locking arm 16. The shaft 41 comprises a part 42 of greater integral diameter of the pin 40 and of a diameter greater than the width of the light 19, but less than the width of the self-locking arm 16, so that the shaft part 42 is in front of the corresponding face of the self-locking arm 16. The cylindrical shaft 42 comprises a part 43 of smaller threaded diameter that passes through the light 19 of the self-locking arm 16 and at the free end of which a nut 44, for example of the Nylstop® type, is screwed, with interposition between the nut 44 and the self-locking arm 16 of a washer 45. The nut 43 is axially locked on the threaded shaft 43 in such a position that there is little axial clearance between the self-locking arm 16, the larger diameter shaft 42 and the washer 45 to allow the threaded shaft 43 slides in the light 19 during the movement of the cover 2 between its closing and opening positions of the frame 1. In this way, arranging on both sides of the arm 16 self-locking, on the one hand, the nut assembly 44 and washer 45 and, on the other hand, the axis 42 of greater diameter, the self-locking arm 16 cannot move laterally in the opening position of the cover 2 when the part 23 of greater diameter is disengaged from the hole or 19a of the self-locking arm 16 in the opening position of the lid 2 to allow the swinging of this lid to its closed position.

Figures 10 and 11 represent a variant embodiment of fixing the cover 20 to the branches 14a of the fork 14 of the cover 2.

The elements of figures 10 and 11 identical and / or that fulfill the same function as those represented concretely in figures 5, 6 and 9 bear the same references and will not be described again in detail.

In addition, Figures 10 and 11 represent the situation according to which the lid 2 is locked in its approximately vertical opening position in which the part 23 of greater diameter of the connecting shaft 18 is coupled, by the attraction of the spring 27, in the circular hole 19a of the light 19 of the self-locking arm 16 with the smaller diameter part 22 of this shaft housed in the corresponding end portion of the sheath 20.

According to this embodiment, the cover 20 is fixed to the branch 14a of the fork 14 located on the side of the spring 27 by means of two nuts 46, 47 screwed onto an externally threaded part of the cover 20 and arranged on both sides of the branch 14a imprisoning this so that the cover 20 is rigidly fixed to this branch perpendicularly to and through it. The fixing nut 46 located between the two branches 14a of the fork 14 is narrower than the other fixing nut 47 supporting on the outer face of the branch 14a on the side of the spring 27 which is supporting on the nut 47 by means of a washer 48.

The two ends 13a of the bodies 13 of the jacks 7 are pivotally mounted between the two branches 14a of the fork 14 on the sheath 20 being spaced apart from each other. One of the ends 13a of the body 13 of the corresponding jack is in support on the nut 46, while the other end 13a of the body 13 of the other cat is in support on a crossbar 49 this same in support on the rigid flat maintenance pin 40 described in relation to Fig. 9. Unlike Fig. 9, the pin 40 is disposed between the crossbar 49 and the flat face of the fork branch 14a 14 opposite the self-locking arm 16. The latter is held in sliding contact support on the corresponding opposite face of the branch 14a of the fork 14 and the cylindrical shaft 41 of the lower end portion of the pin 40 comprises the part 42 of larger diameter of this pin and the joint part 43 of smaller threaded diameter that passes through the light 19 of the self-locking arm 16 and at the end of which the nut 44 is screwed between this nut and the self-locking arm 16 of the washer 45, so that the self-locking arm 16 does not it can move laterally in the opening position of the lid 2 when the larger diameter part 23 is disengaged from the hole 19a of the self-locking arm 16 in the opening position of the lid to allow the swinging of this lid to its closed position.

The end of the sheath 20 located on the side of the cylindrical parts 22, 23 of smaller and larger diameter of the connecting shaft 18, contrary to Figures 5, 6 and 9, does not protrude from the branch 14a of the fork 14 and is flush with the face of this branch in front of the corresponding end of the self-locking arm 16.

In addition, a support tag 50 is fixed perpendicularly to the sheath 20 between the two ends 13a of the bodies 13 of the two jacks 7. This tag 50, which can be in the form of a rectangular metal rigid plate, consists of visible equipment inscriptions in figure 11, which inform an operator about the mode of use of the equipment of the invention.

The covers 2 are made of cast iron, specifically spheroidal, but can be made with any other material. In addition, each cover may have a shape other than a right triangle, for example, rectangular or circular.

The safety device of the equipment of the invention not only improves the safety of personnel by opposing any accidental lowering of each cover 2 on the frame 1, but is of a comfortable operation, specifically

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during the unlocking operation of the self-locking arm 16 in the vertical position of the lid without risk of injury to the fingers of a user's mana. In addition, the equipment of the invention is of a simple and inexpensive structure.

Claims (14)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 1. Road network equipment for roadway registration comprising at least one cover (2) mounted articulated with tilting on the side (3) of a support frame (1) by means of at least one hinge (4) of articulation between a position for closing the support frame (1) and an approximately vertical open position of this frame and, for each cover (2), a safety device comprising a self-locking arm (16) of which one of the ends is pivotally mounted on the side (3) of the frame (1) around a pivot axis (9) and the other end is connected to the cover (2) by means of a shaft (18) integral with the cover (2) and slidably mounted on a longitudinal oblong light (19) of the self-locking arm (16) to allow the rotation of this arm around its pivoting axis (9) during the tilting of the cover (2) between its opening and closing positions and to lock automatically the cover (2) in its raised opening position , characterized in that the axis (18) of attachment of the arm (16) self-locking to the cover (2) comprises two adjacent cylindrical parts respectively of smaller (22) diameter and larger (23) diameter and is axially movable with respect to the cover (2) by the action of an elastic member (27) requesting the part (22) of smaller diameter of the connecting shaft (18) in sliding coupling in the oblong light (19) of the self-locking arm (16) during the swinging of the cover (2) between its two opening and closing positions and the largest diameter part (23) of the coupling joint shaft (18) locked in a circular hole (19a) of the end of the arm (16) self-locking in prolongation of the light (19 ) oblong of this arm when the cover (2) is brought to its elevated opening position.

2.

Equipment according to claim 1, characterized in that in the locked position of the cover (2) in its elevated opening position, the part (23) of greater diameter of the connecting shaft (18) can be released from the circular hole (19a) of the arm (16) self-locking by traction exerted manually on the joint shaft (18) against the return force exerted by the elastic member (27) on the joint shaft (18) to arrange the part (22) of smaller diameter in front of the light (19) oblong arm (16) self-locking and allow the swinging of the lid (2) towards its closed position.

3.

Equipment according to claim 1 or 2, characterized in that the cylindrical parts of smaller (22) diameter and larger (23) diameter of the connecting shaft (18) are connected to each other by means of a shoulder (29) held in support on a corresponding face of the arm (16) self-locking by the elastic organ (27) when the part

(22)

 cylindrical of smaller diameter is coupled in the oblong light (19) of the self-locking arm (16) and because the axis

(18)

 The joint consists of a flange (24) adjacent to the cylindrical part (23) of greater diameter on the opposite side of the cylindrical part (22) of smaller diameter and which is held in support by the elastic member (27) on the face corresponding end of the self-locking arm (16) consisting of the circular hole (19a) when the cover (2) occupies its locked opening position.

Four.

Equipment according to claim 3, characterized in that the connecting shaft (18) is axially supported by means of a fork (14) of the cover (2) and of which an end part protruding from one side of the fork ( 14) consists of the two adjacent cylindrical parts (22, 23) of different diameters.

5.

Equipment according to claim 4, characterized in that the connecting shaft (18) is mounted axially slidably on a sleeve (20) integral with the fork (14) of the cover (2) and of which a part (20a) of end located on the same side as the two adjacent cylindrical parts (22, 23) is suitable for receiving the cylindrical part (22) of smaller diameter of the connecting shaft (18) when its part (23) of greater diameter is coupled in the circular hole (19a) of the self-locking arm (16) with the connecting projection (29) between these two cylindrical parts (22, 23) stopping over the free end of the end part (20a) of the sheath (20) by the action of the elastic organ (27).

6.

Equipment according to claim 5, characterized in that the self-locking arm (16) moves in rotation around its pivot axis (9) between the shoulder (29) and the free end of the end portion (20a) that protrudes from the sheath (twenty).

7.

Equipment according to claim 5 or 6, characterized in that the cover (20) is fixed to the fork (14) by means of a nut (21) coupled on an externally threaded part of the end part (20a) protruding from the cover

(20) and a head (20b) integral with the opposite end of the cover (20) and in support on the corresponding branch (14a) of the fork (14).

8.

Equipment according to one of claims 5 to 7, characterized in that the elastic member (27) is a helical compression spring mounted coaxially around an end portion of the connecting shaft (18) projecting from the fork (14) in the opposite side of the end part of this axis consisting of the two cylindrical parts (22, 23) of different diameters and which is prestressed between the sheath (20) and a nut (30) fixed at the free end of the part corresponding end of the connecting shaft (18).

9.

Equipment according to claim 5 or 6, characterized in that the sheath (20) is fixed to the fork (14) by means of two nuts (46, 47) integral with an externally threaded part of the sheath (20) and which seizes the branch (14a ) of the fork (14) opposite the other branch (14a) adjacent to the self-locking arm (16).

10.

Equipment according to claim 9, characterized in that the elastic member (27) is a helical compression spring mounted coaxially around an end portion of the connecting shaft (18) projecting from the

8 fork (14) on the opposite side of the end part of this shaft consisting of the two cylindrical parts (22, 23) of different diameters and which is prestressed between one of the nuts (47) fixing the sheath (20 ) to the branch (14a) of the fork (14) and a nut (30) fixed at the free end of the corresponding end part of the shaft (18) union. Equipment according to one of the preceding claims, characterized in that it comprises a grip (26) of integral grip of the end of the connecting shaft (18) and which allows traction on this axis to release the part (23) of greater diameter of the circular hole (19a) of the self-locking arm (16). 12. Equipment according to one of the preceding claims, characterized in that the connecting shaft (18) is parallel to the pivot shaft (9) of the arm (16) self-locking on the side (3) of the frame (1) and the pivot shaft (9) of this 10 arm is arranged below the hinge (4) of the lid joint (2) in the frame (1). 13. Equipment according to one of the preceding claims, characterized in that it comprises at least one jack (7) for opening the lid (2) and pivotally mounted, on the one hand, on the side (3) of the frame (1) on the same axis (9) for pivoting the self-locking arm (16) and, on the other hand, on the cover (2) on a shaft coaxial to the joint axis (18). Equipment according to claim 13 when considered in combination with claim 5, characterized in that the support jack (7) is pivotally mounted around the sheath (20) between the two branches (14a) of the fork (14) . 15. Equipment according to one of claims 2 to 14, characterized in that it comprises means (40, 42, 43, 44, 45) of the cover (2) and suitable for laterally holding the self-locking arm (16) when the part 20 (23) of greater diameter of the connecting shaft (18) is released from the circular hole (19a) of the arm (16). 16. Equipment according to one of claims 5 to 15, characterized in that it comprises a rigid label (50) for support for the cover (20) perpendicular to the latter. 9