ES2752071T3 - Locking and unlocking device with the help of a key for a cover on a frame with an integrated stopper for closing a cover opening for the key to pass - Google Patents

Abstract

Equipment comprising a frame (2) and a cover (1) with a locking and unlocking device with the help of a cover key (1) on the frame (2), said device comprising an integral bolt (6) with the cover (1) that has a through opening (4) to access the bolt (6) for the key (3) that includes an arm (7) whose one end (8) allows the bolt (6) to be operated when the key (3) is inserted into the opening (4) of the cover (1) of a locking position in which a latch (12) of the bolt (6) is held captive by a strike (13) of the frame (2) to an unlocking position for which the bolt (12) is released from the strike (13), the bolt (6) comprising a rotor (11) rotatably mounted on the cover (1), accessible at one (11b) of its ends through the opening (4) and carrying the latch (12) at its opposite end (11a), to allow the latch (12) to pivot around the longitudinal axis of the rotor (11) under the action of the key (3), what ndo the end (8) of its arm (7) is in engagement with the corresponding end (11b) of the rotor (11), between its captive and released positions of the strike (13), characterized in that the rotor (11) of the bolt (6) extends perpendicularly under the cover (1), the through opening (4) of the cover (1), coaxial with the end (11b) of the rotor (11) which can be in engagement with the end (8) of the arm (7) of the key (3), is closed by a plug (18) made to return in support under the upper wall (1a) of the cover (1) to its position of sealing the through opening (4) by a return spring (22) and because the key (3), when inserted into the through opening (4), causes the closing cap (18) to move against the return force of the spring (22) along the rotor (11) whose end (11b) comes into contact with the end (8) of the arm (7) of the key (3), characterized in that the through opening (4) of the cover (1) is clogged, so that the plug (18) has its flat end face flush with the end face (11c) of the end (11b) of the rotor (11) and the upper external face (1b) of the cover (1).

Description

DESCRIPTION

Locking and unlocking device with the help of a key for a cover on a frame with an integrated stopper for closing a cover opening for the key to pass

The present invention relates to a device for locking and unlocking with the help of a key for a cover or cover on a frame, specifically, for road registration.

From document FR 2898614 a device of this type is known, which comprises a bolt integral with the cover, which has a through opening for access to the bolt for the key, which includes an arm, one end of which allows the bolt to be maneuvered when the key is inserted into the key. lid opening from a locking position where a latch latch is held captive by a frame strike to an unlocked position for which the latch is released from the strike.

This latch comprises a rotor mounted with rotation on the cover, accessible at one of its ends through the through opening and carrying the latch at its opposite end, to allow the latch to pivot around the longitudinal axis of the rotor under the action of the key , when its end is trapped with the corresponding end of the rotor, between its captive positions and released from the strike.

This known device, as well as, on the other hand, other known locking and unlocking devices with the help of a lid key on a frame, has the drawback that residues can pass through the through opening of the lid that can be reached certain of the internal components of the bolt, which can lead to making it difficult to pivot by the latch key from its position of locking the cover on the frame to its position of unlocking this cover of the frame. In addition, debris can eventually accumulate in the through opening and completely clog it, thereby preventing the key from being inserted into the through opening of the cover to maneuver the bolt latch.

To solve such a problem, one solution is to seal the through-cap opening with a removable plug. However, this solution has the drawback that the plug can be lost after it has been removed during a maneuver from the bolt to its position of unlocking the frame cover or very simply stolen by a malicious person.

DE 102004063048 describes a locking and unlocking device with the help of a key for a cover on a frame. When the end of the key is inserted into a through opening of the device, it comes to rest on an axially movable plate that moves by sinking the key against the return force of a spring to clamp the key with the end top of a locking latch rotor.

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

For this purpose, according to the invention, the device for locking and unlocking with the help of a key for a cover or cover on a frame, comprising a bolt integral with the cover that has a through opening for access to the bolt for the key including an arm of which one end allows the bolt to be maneuvered when the key is inserted into the lid opening from a locking position in which a bolt latch is held captive by a frame strike to an unlocked position for which the bolt is released from the strike, the bolt comprising a rotor mounted with rotation in the cover, accessible at one of its ends by the through opening and bearing the bolt at its opposite end, to allow the bolt to pivot around the longitudinal axis of the rotor under the action of the key, when the end of its arm is caught with the corresponding end of the rotor, between its captive positions and released from the strike, is characterized in that the bolt rotor extends perpendicularly below the cover, the through opening of the cover, coaxial with the end of the rotor that may be caught in the end of the key arm, is sealed by a plug made to return in support under the cover to its closed position in the through opening by a return spring, so that the plug has its flat end face flush with the face at the end of the rotor end and the external upper face of the cover and because the key, when inserted into the through opening, causes the closing plug to move against the return force of the spring along the rotor, the end of which catches the end of the arm of the key. Preferably, the through opening of the cover comprises a circular central hole and two diametrically opposed grooves that open into the central hole and the closing plug is in the form of a cylindrical section mounted with guided sliding on the bolt rotor and of which an end part it includes two diametrically opposed shanks respectively engaged in the two slots of the through opening when the closing plug occupies its sealing position of the through opening, the stems of the closing plug being disengaged from the through opening when the key arm is in squeezing with the end of the bolt rotor to rotate the rotor to its position where the bolt latch is held captive in the frame strike.

Advantageously, the closing plug is integrally rotatable with the end of the bolt rotor and comprises a flange bearing on an internal face of the cover when the plug occupies its closed position of the through opening.

Preferably, the wrench includes at the tubular end of its arm two diametrically opposed lugs conjugated to the grooves of the through opening to allow engagement of the tubular end of the wrench arm through the through opening against the force of return of the spring and to a position in which the two lugs of the key are brought to rest on the internal face of the cover by rotation of the key in clamping with the rotor of the bolt and are maintained on this face by the closing plug and the return force exerted by the spring on the lugs of the closing plug.

Preferably, the closure plug is rotatably supported with the bolt rotor by at least two flaps respectively of the end of the rotor and the central hole of the closure plug.

Preferably, the rotor is rotatably mounted by a bearing-forming ring integral with the cap, and the return spring is pre-tensioned mounted between the closing plug flange and the bearing-forming ring.

The rotor is held axially in relation to the bearing-forming ring, on the one hand, by a projection of the rotor resting on one side of the bearing-forming ring opposite the sealing plug and, on the other hand, by an interposed elastic member between the opposite side of the bearing-forming ring and the latch integral with the other end of the rotor, so that the elastic member exerts an axial stress on the rotor to maintain the rotor projection on the corresponding side of the bearing-forming ring.

Advantageously, the elastic member is a washer.

Preferably, the latch is constituted by a flat arm interposed between the elastic member and an axial retaining pin of the flat arm that passes through the end of the rotor and is rotatably supported with the rotor by two flattening respectively of the end of the rotor and of a hole of the flat arm crossed by the end of the rotor.

Advantageously, the bearing-forming ring is removably fixed in relation to the cover by two diametrically opposed lugs supported by the return spring on an internal face of a wall integral with the cover located at a certain distance from the internal face. of the cover parallel to the latter, the wall including two diametrically opposite grooves through which the two lugs of the bearing ring can be introduced before bringing the ears to rest on the internal face of the wall by rotation of the ring that bearing shape.

According to a preferred embodiment variant of the invention, the closing plug, the return spring, the bearing ring, the elastic member and a part of the rotor are housed in a housing integral with the cover and the latch is located in the outside of this case.

According to this variant, the bearing retaining ring retaining wall is a bottom wall of the housing.

In addition, the bottom wall of the housing includes two stops external to the housing that respectively delimit the locking and unlocking positions of the latch.

The invention will be better understood and other objects, characteristics, details and advantages of this will appear more clearly in the explanatory description that will follow made with reference to the attached drawings given only by way of example that illustrate an embodiment of the invention and in which:

FIG. 1 is a top view of a cover mounted in the locked position on a frame for road registration;

figure 2 is a sectional view along the line M-ll of figure 1 and showing the bolt of the invention in the position of blocking the cover on the frame;

figure 3 is an enlarged view of the part with circle in III of figure 2;

figure 4 is a bottom view according to arrow IV of figure 3;

figure 5 is a top view similar to that of figure 1 and representing a key used to unlock the bolt;

figure 6 is a sectional view along the line VI-VI of figure 5;

figure 7 is an enlarged view of the part with circle in VII of figure 6;

figure 8 is a sectional view along the line VIII-VIN of figure 5;

figure 9 is an enlarged view of the part with circle in IX of figure 8;

figure 10 is a sectional view similar to that of figure 7 and showing the bolt in its unlocked position; figure 11 is a bottom view according to arrow XI of figure 10;

figure 12 is a perspective view of the key used to unlock the frame cover;

FIG. 13 is an exploded perspective view of the different bolt components intended to be housed in a housing integral with the lid; and

- Figure 14 is a perspective view according to arrow XIV of Figure 13 and representing certain components of Figure 13 housed in the housing of the lid.

The locking and unlocking device of the invention that will be described below is very particularly intended to equip a cover or cover 1 that allows closing a frame or chassis 2 that delimits the opening, in particular, of a road register.

The locking and unlocking device can be actuated by a key 3, as will be seen later.

The lid has its substantially flat upper wall which includes an opening 4 which opens, on the one hand, outwards at the level of a flat upper face 1b of this wall and, on the other hand, in an internal cavity 5 of the lid 1 in which a part of a bolt 6 is housed, which the key 3 can access through the through opening 4.

The key 3 comprises a longitudinal arm 7 whose end is provided with a socket 8 coaxial to the arm 7 and a maneuvering handle 9 integral with the opposite end of the arm 7 perpendicular to it. The bushing 8 includes an internal footprint 10 that allows it to be trapped with a rotor 11 rotatably mounted in the internal cavity 5 to maneuver the bolt 6 from a locked position in which a bolt 12 of the bolt 6 is held captive by a striker 13 of frame 2 to lock cover 1 on frame 2 to an unlocked position for which latch 12 is released from striker 13 to allow removal of cover 1 from frame 2.

The rotor 11 includes, integral with its opposite end to that which is intended to enter into seizure with the socket 8 of the key 3, the latch 12 consists of a substantially rectangular flat arm parallel to the upper wall of the cover 1 to a certain distance from this and that it can rotate together with the rotor 11 to occupy its position in which it is held prisoner of the striker 13 of the frame 2 or its position in which it is decoupled from this striker.

According to the invention, the rotor 11 of the bolt 6 extends perpendicularly to the upper wall of the lid 1 below it, passing through the internal cavity 5 and a bottom wall 14 of a casing 15 that delimits the cavity 5 with its side wall 16 integral with the flat internal face 1c of the cover 1. The end part 11a of the rotor 11 that carries the latch 12 protrudes with the latter out of the bottom wall 14 of the casing 15 through a circular opening 17 of this wall .

The rotor 11 is axially fixed in relation to the cover 1, so that its end part 11b is housed coaxially in the through opening 4 with its flat end face 11c flush with the upper flat face 1b of the wall of this cover. .

Furthermore, the through opening 4 of the cover 1 is closed, when the latch 12 of the bolt 6 occupies its position of blocking the cover in the frame 2, by a plug 18 arranged concentrically to the end part 11b of the rotor 11 and whose an end part 19 is housed in the through opening 4 around the end part 11b of the rotor 11 and in a complementary way to that of the through opening 4, to seal the remaining part of the opening located between the opening 4 and the part of end 11b of the rotor 11. According to the invention, the end portion 19 of the plug 18, when the latter occupies its sealing position of the through opening 4, has its flat face at the end 19c flush with the face at the end 11c of the rotor 11 and the flat top face 1b of the cover 1.

Preferably, the cap 18 is made up of a cylindrical section, one part of which is made up of end part 19 and the other end part 20 is housed in internal cavity 5.

The stopper 18 includes a flange 21 located between the two parts of cylindrical sections 19, 20 and arranged in support, in the closing position of the stopper 18, on an inner annular flat face 1d of the wall of the cover 1 that delimits with upper flat face 1b through opening 4.

The plug 18 is held in its closed position of the through opening 4 by a return spring 22 of the helical compression type, mounted prestressed between the flange 21 of the plug 18 and a ring 23 that forms a guide bearing in rotation of the part of the end 11a of the rotor 11, the ring 23 being housed and secured in the housing 15 of the cover 1.

The lower end part 11a of the rotor 11 is connected to the upper end part 11b by a shoulder 11d held axially abutting on the bearing ring 23, as will be seen later.

The plug 18 can be guided axially along the end part 11b of the rotor 11 against the return force of the spring 22 when the socket 8 of the key 3 is introduced through the through opening.

For this purpose, the closure plug 18 has its through hole 24 complementary to the external shape of the end part 11b of the rotor 11.

More particularly, the end part 11b of the rotor 11 includes a flattening 11e which extends the entire length of the end part 11b and which can cooperate with a flattening 24a of the through hole 24 of the plug 18.

Furthermore, the end part 11b of the rotor 11 includes a second flattening 11f of less width than that of the flattening 11e, connected to the latter and constituting a guide that cooperates with a second flattening 24b of hole 24 of plug 18.

In this way, the plug 18 can slide axially along the rotor 11 against the return force 22 while being rotatably supported with the end part 11b.

The plug 18 comprises two diametrically opposite shafts 25 coupled, in the closing position of this plug, respectively in two diametrically opposed grooves or notches 4a of the through opening 4. The two grooves 4a open into the circular central hole 4b of the through opening 4 The two rods 25 protrude from the section part 19 of the plug 18 and have an external diameter equal to the external diameter of the flange 21.

In this way, in the closed position of the plug 18, the two rods 25 and the section part 19, in a complementary way to that of the through opening 4, completely seal the latter around the end part 11b of the rotor 11 and its Respective end faces constitute the end face 19c which is flush with the end face 11c of the rotor 11 and the upper flat face 1b of the cap 1 in the closed position of this plug.

The tread 10 of the socket 8 of the key 3 is complementary to that of the end part 11b of the rotor 11, that is, that the tread 10 includes a flattening 10a suitable to cooperate with the flattening 11e of the end part 11b of the rotor 11 and a second flattening of a narrower width 10b suitable to cooperate with the flattening 11f of the end part 11b to together constitute a guiding means.

The socket 8 of the wrench 3 includes two diametrically opposed lugs 26 protruding on each side of the socket 8 and conjugated respectively with the two diametrically opposed grooves 4a of the through opening 4. The socket 8 has an external diameter of a substantially diameter equal to the external diameter of the section part 19 of the cap 18 and the two lugs 26 of the cap 8 are identical in shape to the two rods 25 of the cap 18, the external diameter of the cap 8 being slightly less than the diameter of the through part 4 .

The bearing-forming ring 23 includes two radially external and diametrically opposed lugs 27 which engage, during mounting of the bolt components in the housing 15, respectively in two diametrically opposed grooves or notches 28 made through the bottom wall 14 of the casing 15. The bearing-forming ring 23 is threaded on a cylindrical portion of the end part 11a of the rotor 11 connected to the projection 11d of this rotor and the ring 23, once its face is faced with the plug 18 resting on projection 11d is rotated by approximately a quarter turn to dispose the two lugs 27 resting on the corresponding internal face 14a of the bottom wall 14 of the casing 15, the spring 22 exerting an axial effort to maintain the two lugs 27 on this inner face. In this way, the bearing-forming ring 23 is removably fixed in the internal cavity 5 of the housing 15.

The flat arm that constitutes the latch 12 is threaded on the end part 11a of the rotor 11 above the bearing-forming ring 23 considering figure 13 and is rotatably supported with this end part by a flattening 29a of a through hole 29 of this arm cooperating with a flattening 11g of the end part 11a of the rotor 11.

The latch arm 12 is axially fixed to the end part 11a of the rotor 11 by a split pin 30 that passes through a hole 11h of the end part 11a of the rotor with interposition between the pin 30 and the latch arm 12 of two washers tapered 31 strung on end part 11a.

A spring washer or spring 32 is threaded onto end portion 11a of rotor 11 and interposes between bearing ring 23 and latch arm 12 to exert axial stress on rotor 11 which maintains it axially in contact with the bearing-forming ring 23 by its projection 11d, thereby axially supporting the rotor 11 in relation to the cover 1.

Preferably, the spring washer 32 is constituted by a washer with two central corrugations on the same side that constitute two lugs 32a respectively engaged in two diametrically opposite notches 33 of the bearing-forming ring 23, so that the washer 32 exerts an axial thrust on the latch 12.

According to a variant not shown, the washer 32 could very simply be made of an elastomerically compressible material in the axial direction.

The bottom wall 14 of the housing 15 includes two stops 34 external to the housing 15 and intended to delimit the pivoting of the latch 12 between its two extreme positions of locking the cover 1 in the frame 2 and unlocking this cover of the frame .

The assembly of the different components described above of the bolt 6 located largely in the housing 15 of the cover 1 is carried out as follows.

In the first place, the cover 1 is turned so that its upper face 1b is resting on the ground or any other flat support (figure 13).

Next, the plug 18 is housed in the internal cavity 5, inserting its two rods 25 respectively in the two grooves 4a of the through opening 4 until its flange 21 comes to rest on the corresponding annular face 1d of the wall of the lid one.

The rotor 11 is then positioned in the plug 18 by inserting its two flaps 11e, 11f respectively in the two flaps 24a, 24b of the plug 18 and the spring 22 is then threaded on the rotor 11 and the part of section 20 of plug 18 with the end turn of this spring resting on flange 21 of plug 18.

The bearing ring 23 is then placed on the wall 14 by inserting its two lugs 27 respectively into the two grooves or notches 28 of the wall 14, and then axial pressure is exerted on the bearing ring 23 by compressing the spring 22 until the ring 23 comes to rest on the projection 11d of the rotor 11 and, then, the ring is rotated in approximately a quarter turn to put the two lugs 27 on the corresponding internal face 14a of the wall 14 , thus locking ring 23 in housing 15 of cover 1.

In this way, the assembly with plug 18, rotor 11, spring 22 and bearing ring 23 is housed in the internal cavity 5 and axially maintained in the casing 15.

Subsequently, the washer 32 is threaded on the end part 11a of the rotor 11 entering into support on the bearing ring 23 and the locking bolt 12 is also threaded on the end part 11a, coupling the flattening 29a of its hole 29 with the flattening 11g of the end part 11a of the rotor 11. The washer 32 is then housed in the housing 15, but the latch 12 and the remaining portion of the end part 11a of the rotor 11 are on the outside of this case.

The two conical washers 31 are threaded onto the end part 11a of the rotor 11 protruding from the latch 12 and the pin 30 engages through the perforation 11h of the end part 11a elastically compressing the washer 32 between the latch 12 and the bearing ring 23.

Once the lock of the invention is installed in the housing 15, it is enough to turn the cover 1 to apply it on the frame 2 and the plug 18 seals, then, practically hermetically, the through hole 4 of this cover.

At this time, the operation of the lock of the invention to unlock the cover 1 of the frame 2 will be explained.

In the position of locking the cover 1 on the frame 2, the latch 12 occupies its position in which it is captive of the striker 13 of the frame 2 being supported on one of the two stops 34 of the casing 15, as shown in Figures 1 to 4.

Figures 5 to 9 show that an operator has positioned the key 3 above the through opening 4, so that the two lugs 26 of the socket 8 of this key are plumb with the two conjugated grooves 4a of the through opening 4 and that the two flattening 10a, 10b of the tread 10 of the bushing 8 are respectively arranged opposite the flattening 11e and 11f of the rotor 11.

In the position shown above of the key 3, the operator then exerts vertical pressure on the key 3 in order to connect the key 3 to the rotor 11 by means of the flattening 10a, 10b and 11e, 11f and to sink the plug 18 in the internal cavity 5 against the return force of the rotor 22 until the plug 18 is arranged practically above the bearing ring 23, to arrange the two lugs 26 of the key 3 below the lower internal face 1d of the the wall of the cover 1. The key 3 is turned in approximately a quarter of considering, specifically, figure 4, to pivot the latch 12 from its locked position shown in figure 4 to its unlocked position shown in Figure 11 and carry the two lugs 26 of the key 3 under the internal face 1d of the cover 1, these ears being kept under this face by the return force exerted by the spring 22 and the plug 18 on the two ears 26. In this way, the The key 23 is imprisoned in the internal cavity 5 of the cover 1 and allows it to be manipulated to raise it without the risk of losing the key 3 once the cover 1 is completely decoupled from the frame 2.

To lock cover 1 on frame 2 again, after cover 1 has been placed on this frame, key 3 is operated counterclockwise considering Figures 10 and 11 by approximately a quarter turn to carry the two lugs 26 of the key 3 respectively in front of the two grooves 4a of the through opening 4 and the spring 22 expands to exert on the plug 18 an effort that makes this plug slide up along the rotor 11 to bringing it to its position, in particular, of figure 9, where it again closes with the end part 11b of the rotor 11 the through opening 4, the spring 22 carrying the bushing 8 and its lugs 26 above the upper face flat 1b of cover 1 to allow the operator to retrieve the key 3.

Figures 2 and 8 show that the cover 1 is pivotably mounted, on the opposite side of the locking device, about a hinge axis A, as this is known per se to retain the cover 1 in the frame 2 when the Cover 1 occupies its upright raised position to release the opening of frame 2. However, the hinge of cover 1 in frame 2 may be of the type that allows the removal of cover 1 from this frame in the upright raised position of cap 1.

The device of the invention allows the through opening of a lid to be closed almost hermetically with the help of a plug that cannot be lost and that can be hidden during the insertion of a key to manipulate the bolt from its locked position to its position. unlocking position of the support frame using a bolt of an extremely simple structure. Furthermore, once the cover has been unlocked from its supporting frame, the release key is held captive in the cover to allow the latter to be directly manipulated by the key without the latter being able to accidentally detach from the cover. Finally, once the cover is completely uncoupled from the frame, the key cannot be lost, due to the fact that it remains a captive of the cover.

Claims (13)

1. Equipment comprising a frame (2) and a cover (1) with a locking and unlocking device with the help of a key for the cover (1) on the frame (2), said device comprising a bolt (6 ) integral with the cover (1) that has a through opening (4) to access the bolt (6) for the key (3) that includes an arm (7) whose one end (8) allows maneuvering the bolt (6) when the key (3) is inserted into the opening (4) of the cover (1) of a locking position in which a bolt (12) of the bolt (6) is held captive by a striker (13) of the frame (2 ) to an unlocked position for which the bolt (12) is released from the strike (13), the bolt (6) comprising a rotor (11) rotatably mounted on the cover (1), accessible in one (11 b) of its ends through the opening (4) and that carries the bolt (12) at its opposite end (11a), to allow the bolt (12) to pivot around the longitudinal axis of the rotor (11) under the action of the wrench (3), when the end (8) of its arm (7) is gripped with the corresponding end (11b) of the rotor (11), between its captive positions and released from the striker (13), characterized in that the rotor ( 11) of the bolt (6) extends perpendicularly below the cover (1), the through opening (4) of the cover (1), coaxial with the end (11b) of the rotor (11) that may be in seizure with the end (8) of the arm (7) of the key (3), is sealed by a plug (18) made to return in support under the upper wall (1a) of the cover (1) to its position of closing the opening through (4) by a return spring (22) and because the key (3), when inserted into the through opening (4), causes the closing plug (18) to move against the return force of the spring (22) along the rotor (11) whose end (11b) catches the end (8) of the arm (7) of the key (3), characterized in that the through opening (4) of the cover (one) it is sealed, so that the plug (18) has its flat end face flush with the end face (11c) of the end (11b) of the rotor (11) and the external upper face (1 b) of the cover ( one). Equipment according to claim 1, characterized in that the through opening (4) of the cover (1) comprises a circular central hole (4b) and two diametrically opposed grooves (4a) that open into the central hole and the closing plug. (18) is in the form of a cylindrical section mounted with guided sliding on the rotor (11) of the bolt (6) and whose end part (19) includes two diametrically opposed rods (25) respectively coupled in the two grooves (4a) of the through opening (4) when the closing plug (18) occupies its shutter position of the through opening (4), the rods (25) of the closing plug (18) being disengaged from the through opening (4) when the arm (7) of the key (3) is in grasp with the end (11b) of the rotor (11) of the bolt (6) to drag the rotor (11) in rotation from its position in which the latch ( 12) of the bolt (6) is held prisoner in the strike (13) of the frame (2). Equipment according to claim 1 or 2, characterized in that the closing plug (18) is rotatably integral with the end (11b) of the rotor (11) of the bolt (6) and comprises a flange (21) resting on an internal face (1d) of the cover (I) when the plug (18) occupies its closed position of the through opening (4). Equipment according to claim 2 or 3, characterized in that the key (3) includes at the tubular end (8) of its arm (7) two diametrically opposed lugs (26) in conjuction with the grooves (4a) of the through opening (4) to allow coupling of the tubular end (8) of the arm (7) of the key (3) through the through opening (4) against the return force of the spring (22) and up to a position in which the two lugs (26) of the wrench (3) are supported on the inner face (1d) of the cover (1) by rotation of the wrench (3) in seizure with the rotor (11) of the bolt (6) and are maintained on this face by the closing plug (18) and the return force exerted by the spring (22) on the lugs (25) of the closing plug (18). Equipment according to claim 3 or 4, characterized in that the closing plug (18) is rotatably supported with the rotor (11) of the bolt (6) by at least two flattening (11e, 24a) respectively of the end (11b) ) of the rotor (II) and the central hole (24) of the closing plug (18). Equipment according to claim 3 or 4, characterized in that the rotor (11) is mounted with rotation by a bearing-forming ring (23) integral with the cover (1) and in that the return spring (22) is mounted prestressed between the flange (21) of the closing plug (18) and the bearing ring (23). Equipment according to claim 6, characterized in that the rotor (11) is maintained axially in relation to the bearing-forming ring (23), on the one hand, by a projection (11d) of the rotor (11) resting on a side of the bearing-forming ring (23) facing the closing plug (18) and, moreover, by an elastic member (32) interposed between the opposite side of the bearing-forming ring (23) and the latch (12) integral with the other end (11a) of the rotor (11), so that the elastic member (32) exerts on the rotor (11) an axial effort to maintain the projection (11d) of the rotor (11) on the corresponding side of the bearing ring (23). Equipment according to claim 8, characterized in that the elastic member (32) is a washer. Equipment according to claim 6 or 7, characterized in that the latch (12) consists of a flat arm interposed between the elastic member (32) and a pin (30) for axial retention of the flat arm that passes through the end (11a ) of the rotor (11) and is supported in rotation with the rotor (11) by two flattening (11g, 29a) respectively of the end (11a) of the rotor (11) and of a hole (29) of the flat arm crossed by the end (11a) of the rotor (11). Equipment according to any one of Claims 6 to 9, characterized in that the bearing-forming ring (23) is removably fixed in relation to the cover (1) by two diametrically opposed lugs (27) held in support by the return spring (22) on an internal face (14a) of a wall (14) integral with the cover (1) located at a certain distance from the internal face of the cover (1) parallel to the latter, including the wall ( 14) two diametrically opposite grooves (28) through which the two lugs (27) of the bearing ring (23) can be inserted before bringing the lugs (27) to rest on the internal face of the wall (14 ) by rotation of the bearing-forming ring (23). Equipment according to any one of the preceding claims, characterized in that the closing plug (18), the return spring (22), the bearing-forming ring (23), the elastic member (32) and a part of the rotor (11) are housed in a casing (15) integral with the cover (1) and the latch (12) is located on the outside of this casing. Equipment according to claim 11 when considered in combination with claim 10, characterized in that the bearing retaining ring retaining wall (23) is a bottom wall (14) of the casing (15). Equipment according to claim 12, characterized in that the bottom wall (14) of the casing (15) includes two stops (34) external to the casing (15) that respectively delimit the locking and unlocking positions of the latch ( 12).