Multi-plate connection device comprising quick-release couplings and electrical connectors with safety locking device

Abstract

The present invention relates to a multi-connection plate device (1) of the cam (150) and lever (160) type for simultaneously connecting a plurality of hydraulic lines for pressurized fluids and electrical connectors. The device comprises a fixed multi-connection element (100, 300) in turn comprising a first plate element (101, 301) supporting a plurality of female couplings (10) for connection to the hydraulic circuit of an operating machine, and a second movable multi-connection element (200) in turn comprising a second plate element (201) supporting a corresponding plurality of male couplings (20) suitable for connection to the hydraulic circuit of a utility, said multi-connection device (100, 300), the device further comprising a closure cover (109, 309) movable between an open position in which said plurality of female couplings (10) located on said first plate element (101) are accessible from the outside, and a closed position in which said plurality of female couplings (10) located on said first plate element (101) are not accessible from the outside, and further comprising, associated with said first plate element (101, 301), at least a first connection plate (103), suitable for inserting into a connector holder element (130), or into a secure body (339), comprising a lid closure device.

Description

[0001] MULTI-PLATE CONNECTION DEVICE COMPRISING QUICK-RELEASE COUPLINGS AND ELECTRICAL CONNECTORS WITH SAFETY LOCKING DEVICE

[0002] * * *

[0003] FIELD OF THE INVENTION

[0004] The present invention relates to a multi-connection plate device for simultaneously connecting a plurality of quick-release couplings for hydraulic lines under pressure and electrical connectors, provided with a safety locking device.

[0005] The multi-connection device according to the present invention is improved with respect to the solutions known from the state of the art, in particular it is provided with an improved safety locking cover, provided with a locking system for preventing accidental release.

[0006] In addition, the multi-connection device is of the fixed and movable plate type and is advantageously equipped with a pair of substantially box-shaped connector bodies in which the male and female connectors are housed, equipped with an innovative system of attachment and release to the plates.

[0007] Last but not least, the multi-connection plate device according to the present invention comprises a sealing cover suitable for sealing against water and dirt both at the multi-connector plate on the machine side and at the electrical connector housed in the connector holder connected to said plate.

[0008] Further, the multi -connector plate device according to the present invention further comprises a separation gap compensation system between the fixed plate and the movable plate.

[0009] STATE OF THE ART

[0010] As is known from the state of the art, in multi connection plate devices for simultaneously coupling a plurality of quick couplings for pressurized fluids of the type considered herein, it is often required that not only a plurality of hydraulic lines by means of quick couplings, but also one or more electrical lines by means of as many electrical connectors can be simultaneously connected.

[0011] The devices of the known type, however, are often lacking in terms of their ability to protect the electrical connector or connectors on the plates from water and dust by means of an adequate locking system.

[0012] Some solutions provided to this problem in the state of the art, e.g. described in EP3521521B1 on behalf of the same Applicant, provide for a coverthat is kept closed by a pair of needle rollers that engage directly in the cams that perform the tightening of the device plates.

[0013] However, this solution is not without its drawbacks, as it is necessary to make a specific closing cover for each plate element that will have different dimensions and shapes depending on the number of electrical connectors housed in the plates, thus requiring a special mould to be made for each cover, which will have to be different not only according to the different plates, but also according to the position and shape of the cams.

[0014] A further problem afflicting devices of the type known from the state of the art is that they generally lack suitable safety systems to prevent accidental opening of the lid system.

[0015] Furthermore, a drawback afflicting devices of the type known from the state of the art considered herein consists in the difficulty of realizing a safe and reliable connection of the electrical connectors when pressurized oil flows through the hydraulic lines connected by means of the male and female couplings.

[0016] SUMMARY OF THE INVENTION

[0017] In view of the foregoing, it is a task of the present invention to realize a multi-plate connection device, of the fixed and movable plate type, provided with a simultaneous connection system for pressurized hydraulic lines and electrical connectors which enables to solve the problems which plague systems of the type known from the state of the art.

[0018] For this purpose, the device according to the invention is advantageously provided with a pair of substantially box-shaped connector-holding bodies, one associated with the fixed plate and one associated with the movable plate, and within which are housed male and female connectors, designed to be engaged and disengaged to the plates by means of an innovative fastening system. This system allows for easy assembly and disassembly, while guaranteeing the safety of the electrical connection.

[0019] Furthermore, the multi-connector plate device according to the present invention comprises a sealing cover capable of realizing water and dust tightness both at the fixed multiconnector plate on the machine side and, thanks to a dedicated gasket, at the electrical connector housed in the connector holder associated with said fixed plate. This effectively protects the internal elements from external agents, preserving the integrity of the system during its use.

[0020] A further innovative aspect of the device according to the present invention consists in a system for compensating the separation gap between the fixed plate and the movable plate, caused by pressure in the hydraulic circuits. This system, through the use of elastic elements, ensures that the electrical connectors contained in the connector holders maintain perfect interpenetration and thus secure the connection even in the presence of pressure variations in the hydraulic lines.

[0021] In the context of this task, it is the scope of the present invention to realize a multiconnection device comprising a system for compensating the gap between the plates caused by the high hydraulic pressure in the lines which tends to separate the fixed and movable plates, thus ensuring the correct functioning of the electrical connectors.

[0022] A further purpose of the invention is to equip the device with a lid locking system with a safety catch to prevent accidental opening.

[0023] The above-mentioned task, as well as the aforementioned purposes and others which will better appear later, are achieved by a multi-connection plate device for simultaneous connection of a plurality of quick-release couplings for hydraulic pressure lines and electrical connectors according to claim 1.

[0024] Other advantageous features are listed in the dependent claims.

[0025] LIST OF FIGURES

[0026] Further advantageous features and advantages will more fully result from the illustrative but not limiting description of preferred embodiments of the present invention, illustrated with the aid of the appended drawings in which:

[0027] - Figure 1 is an overall view of the multi-connection plate device for simultaneously connecting a plurality of quick couplings for hydraulic pressure lines and electrical connectors according to the present invention, in an embodiment wherein the electrical connectors are housed in a connector holder;

[0028] - Figure 2 is a partially disassembled view of only the first fixed multi -connector element of the device according to the present invention;

[0029] - Figure 3 is a detail view of the first fixed multi-connection element to which a first connection plate is associated;

[0030] Figure 4 is an overall view of the first fixed multi-connection element to which a first connection plate of Figure 3 is associated;

[0031] - Figure 5 shows an overall perspective view of the connector holder to which the first connection plate of the first multi-connection element of Figure 4 is associated;

[0032] - Figures 6 and 7 show perspective views of the second multi-connection element according to the present invention;

[0033] - Figure 8 shows a perspective view of the second connector holder associable to the connection plate of said second multi-connection element shown in Figure 7;

[0034] - Figure 9 shows a perspective view of the second multi -connection element to which is associated, by means of said second connection plate, the second connector holder element shown in Figure 8; - Figures 10 to 15 show the structure and operation of the device lid retaining system according to the present invention;

[0035] - Figures 16 to 20 show the structure and operation of the plate gap compensation system for optimal electrical connection;

[0036] - Figures 21 to 23 show the first multi-connection element and the secure body of the multi-connection plate device in accordance with a second embodiment of the present invention.

[0037] DETAILED DESCRIPTION OF THE INVENTION

[0038] In the appended Figures, the multi-connection plate-and-lever device for simultaneous connection of quick couplings for pressurized fluids according to the present invention is referred to globally by reference numeral 1.

[0039] The multi-connection device 1 according to the present invention is in particular of the cam 150 and lever 160 type, and is designed to allow the simultaneous connection of a plurality of hydraulic lines via male couplings 20 and female couplings 10 for fluids under pressure, and of electrical connectors 400.

[0040] More in detail and with reference to the appended figures, the multi connection device 1 according to the present invention comprises a first fixed multi connection element 100 provided with a first plate element 101, supporting a plurality of female couplings 10 connectable to the hydraulic circuit of an operating machine.

[0041] Said fixed multi connection element 100 is associated with a second movable multi connection element 200 which in turn comprises a second plate element 201 supporting a corresponding plurality of male couplings 20, which can be connected to the hydraulic circuit of a utility.

[0042] One of the features of the multi connection device 1 according to the present invention is that it comprises an electrical connector system 400.

[0043] Advantageously, according to the preferred embodiment illustrated by way of example in the attached figures, said electrical connector system 400 comprises, on said multiconnection device 1, a first connector holder 130 associated with said fixed multi-connection element 100, and a second connector holder 230 associated with said movable multi-connection element 200.

[0044] The first connector holder 130 is advantageously removably attached to the fixed element 100 by means of a first connection plate 103, advantageously comprising at each end an end section 105 bent so as to protrude from the wall of the first plate element 101 and comprising in turn one or more recesses 106, said first connection plate 103 being adapted to fit within a receiving groove 108 formed on the body of the first connector holder 130.

[0045] Similarly, the second connector holder 230 is removably attached to said second movably movable multi connect! on element 200 by means of a second connection plate 203, advantageously comprising at each end an end section 205 bent so as to protrude from the wall of the second plate element 201 and comprising in turn one or more recesses 206, said second connection plate 203 being adapted to fit within a corresponding receiving groove 208 obtained on the body of the second connector holder 230.

[0046] Preferably, said connection plates 103, 203 are fixed to the respective plate elements 101, 201 by means of fixing screws 104, 204 which are inserted in through holes 103a, 203a obtained on the receiving plates and are accommodated in receiving holes 102, 202 present on the respective plate elements 101, 201.

[0047] Advantageously, therefore, a receiving groove 108 is obtained on the rear wall of said first connector holder 130, while threaded holes 108a are obtained on the sides of said connector holder so that said first connector holder 130 can be fixed to said first plate element 101 of said first fixed multi connection element 100 by sliding it from top to bottom and is then fixed by inserting appropriate threaded grub screws 108b into the threaded holes 108a.

[0048] Similarly, on the rear wall of said second connector-holder 230 a receiving groove 208 is obtained suitable to receive said second connection plate 203, while threaded holes 208a are obtained on the upper wall of said second connector-holder 230 so that when the second connector-holder 230 is fixed to the second plate element 201 by sliding it from right to left or vice versa, transversally therefore with respect to the longitudinal axis of the plugs and / or connectors, and is then fixed by inserting threaded grub screws 208b into the threaded holes 208a. Reference is made, for example, to Figures 8 and 9.

[0049] Advantageously, said electrical connector system 400 comprises one or more modular connectors 132 comprising female electrical contacts 133 housed within said first connector holder 130, and one or more connectors 232 comprising male electrical contacts 233 housed within said second connector holder 230.

[0050] As will now be described in detail with reference to the appended figures, the multiconnection device 1 according to the present invention comprises a water- and dirt-tight closure system, capable of preserving not only the female quick-release couplings 10 housed within said first plate element 101, but also the female electrical contacts 133 housed within said first connector holder 130 associated with said first fixed multi -connection element 100. The closure system comprises a closure cover 109 movable between an opening position in which said plurality of female couplings 10 located on said first plate element 101 is accessible from the outside, and a closing position in which said plurality of female couplings 10 located on said first plate element 101 is not accessible from the outside, being surmounted by said closure cover 109.

[0051] Advantageously, said closure cover 109 is hinged to said first plate element 101 at said hinge elements 109a. Preferably, torsional springs 109b suitable for maintaining said lid 109 in an open position are provided at said hinge elements 109a.

[0052] In order to protect from water and dust not only the female couplings 10 located on said first plate element 101, but also the electrical contacts 133 housed within said first connector holder 130 associated with said first fixed multi-connection element 100, said closing cover 109 comprises a first portion 109' which, in a closed position, surmounts said first plate element 101, and a second portion 109' which, in a closed position, surmounts the upper part of said first connector holder 130.

[0053] The second lid portion 109" advantageously comprises a first gasket 129, which fits into the first connector holder 130, providing an effective seal against water and dirt.

[0054] Advantageously, the device also comprises a second gasket 129' mounted on said second connector holder 230 so as to ensure protection against external agents even in the condition of fixed and movable plates coupled together.

[0055] Advantageously, said device further comprises a third gasket 110 placed in correspondence with the first portion 109' of said end cap 109 surmounting the first plate element 101 to protect the female couplings 10. Said third gasket 110 is preferably made of foam rubber sponge, which can provide effective protection to water and dust.

[0056] Another aspect of particular relevance to the present invention is the lid closure system 109. Referring, for example, to Figures 11 and 16, the closing cover 109 hinged to the first plate element 101 acts as a lid to protect both the plurality of female connectors 10 supported by said first plate element 101, and the electrical connectors, and in particular the female electrical contacts 133, housed within said first connector holder 130.

[0057] As mentioned, the closing cover 109 is held in the open position by torsional springs 109b mounted at the hinge elements 109a. Advantageously, a push-button restraint system 120 is suitably provided to ensure closure of the lid 109 and prevent accidental or otherwise unwanted opening.

[0058] Advantageously, said push-button restraint 120 advantageously comprises a sliding lock / unlock button 122, operable by the user to allow or prevent operation of the push-button restraint 120, comprising a first inner tab 123 and a second outer tab 124, wherein internal is what faces the first plate element 101 and external is what faces the opposite side, as shown for example in Figure 11, both rotatable around a cylindrical pin 125 and maintained in the rest position, corresponding to the position of the lid locked by said striker element 123a, by a coil spring 126.

[0059] Advantageously, said first internal tab 123 has a striker element 123a capable of interacting with the lid 109, opposing the action of the torsional springs 109b and keeping it closed until the button 122 is actuated.

[0060] When the operator presses on the lower portion of the outer tab 124, the tabs 123, 124 rotate about the axis of the pin 125 allowing the lid 109 to open under the action of the torsional springs 109b.

[0061] Advantageously, according to what is particularly visible in Figure 15, the outer tab 124 is slidable with respect to the inner tab 123 between a first release position in which said outer tab 124 is raised and in which the rotational movement of the tabs 123, 124 around the axis of the pin 125 is allowed, and a second lowered position in which the rotational movement of the tabs 123, 124 around the axis of the pin 125 is prevented. When the pushbutton latch 120 is in its position assembled to the connector holder 130, or to the secure body 339 according to the embodiment that will be described below, the outer tab 124 is movable relative to the inner tab 123 and the connector holder 130 or secure body 339 substantially vertically.

[0062] When the cover 109 is in the closed position, as shown in Figure 12, it is possible for the operator, acting on the lock button 122, to slide the tab 124 downwards, bringing the pushbutton latch 120 into a locked condition. In this condition, in fact, the lower end 124a of the outer tab 124 is blocked in its rotational movement around the axis of the pin 125 by the striker 130' obtained internally to the connector holder body 130, and it is therefore ensured, the retention of the cover 109 in a closed condition as it is retained by the striker element 123a provided at the upper end of the tab 123.

[0063] In this locked condition of the push-button latch 120, it is not possible for the operator to act on the push-button latch 120 to release the lid from the striker member 123a provided at the top end of the tab 123 and allow the torsional springs 109b to cause the lid 109 to open.

[0064] In this locked condition of the push-button latch 120, rotation of the tongues 123, 124 about the axis of the pin 125 is prevented, and thus greater security against accidental release is also provided. In fact, it is necessary beforehand to slide the outer tab 124 upwards again to disengage the outer tab 124 from the striker 130' and consequently allow operation of the lock / unlock button 122.

[0065] Figure 12 illustrates, as noted above, a locked button condition in which the security system prevents operation of the lock / unlock button 122 to open the lid 109', while Figures 13 and 14 illustrate a condition of the outer tab 124 being moved upwards, which causes the outer tab 124 to disengage from the striker 130', i.e., the security system to be deactivated. In this condition, the operator can press the lock / unlock button 122.

[0066] Last but not least, in order to ensure the continuity of the electrical connection even in the presence of high pressures in the hydraulic lines or abrupt pressure variations, the multiplate connection device 1 according to the present invention is provided with a separation gap compensation system between the first plate element 101 and the second plate element 201.

[0067] Said system comprises coil springs 136 acting between the first plate-connector element 130 and the second plate-connector element 230, maintaining the electrical contacts 133, 233 under conditions of maximum interpenetration, even when the oil under pressure in the hydraulic circuits tends to separate the two plate elements 101, 201.

[0068] More specifically, the compensation system includes a first support frame 131, on which the first modular connectors 132 with female contacts 133 are housed, and a retaining plate 137 fixed to the first connector holder 130 by means of fixing screws 138 advantageously inserted within support elements 135 present on the first support frame 131, said retaining plate 137 apt to retain said first support frame 131 thus limiting its travel due to the thrust of the springs 136.

[0069] In this example embodiment, said first support frame 131 is pushed towards said second connector holder 230 by helical springs 136 provided in correspondence with support elements

[0070] 135 present on said first support frame 131, however, it is clear that the movable frame pushed by springs could alternatively be provided on said second connector holder 230.

[0071] On said second connector holder 230 there is a second support frame 231, within which the second modular connectors 232 with male contacts 233 are housed. The second support frame 231 is fixed to the second connector holder 230 by means of screws 234. Coil springs

[0072] 136 push said first support frame 131 and therefore said first female contacts 133 towards the male contacts 233 associated with said second support frame 231 of said second connector holder 230, ensuring optimal interpenetration between the male and female electrical contacts.

[0073] When the second movable multi-connection element 200 is coupled to the first fixed multi-connection element 100 by means of the cam system 150 engaging the pins 250 on the second movable element 200 and the lever 160, as known, causing the coupling of the quick couplings 10, 20 and the electrical connector system 400, in the course of connecting the electrical connector system the first support frame 131, and therefore the modular connectors 132 and the electrical contacts 133 associated therewith, can be moved downwards (in Figure 20) by compressing the coil springs 136.

[0074] At the end of the connection phase, therefore, the first support frame 131, and therefore the modular connectors and electrical contacts associated with said first connector holder 130, are moved downwards pushed by the support frame 231 of said second connector holder 230 associated with said second moving plate element 201.

[0075] In the event that the first plate element 101 and the second plate element 201 tend to separate due to a high hydraulic pressure present in the couplings 10, 20 that connect the hydraulic lines, the compensation system and in particular the coil springs 136 maintain the electrical connectors 132, 232 in a condition of maximum interpenetration, as shown in Figure 20, in which the plates 101, 201 are shown in a condition in which they are not in contact while the electrical connection is ensured.

[0076] The modular connectors 132, 232 used to equip the multi-connection device 1 according to the present invention offer the advantage of great modularity: in fact, a plurality of modules with variable number and size of contacts can be used so as to cover multiple types of transmitted signal.

[0077] However, it is also possible for an electrical connector 337 that is not modular and can be integrated into a housing formed directly in the plate element 301 to be assembled directly into the first plate element 301, as shown in Figure 21, with a corresponding connector not shown inserted into a second plate element, also not shown, and capable of covering a wide range of applications.

[0078] As an alternative to that described above with reference to Figures 1 to 20 in which the modular electrical connectors were contained in the connector holders 130, 230 associated with the outer surface of the plates 101, 201, an alternative embodiment is shown in Figures 21 to 23 in which the multi -connection plate device comprises a first fixed multi -connection element 300 supporting an electrical connector 337 inserted directly into a specially formed seat in the plate element 301. Of course, a corresponding connector will be inserted in the second plate element, not shown.

[0079] Also in this alternative solution, the possibility of having the cover safety system against accidental release, as previously described, is still provided, however, the closing cover 309 in this case will comprise only a first portion 309' which, in the closed position, surmounts said first plate element 301 preserving the quick couplings 10 and the electrical connector 137 from water and dust.

[0080] The other characteristics of the closure cover 309 correspond to what has already been described above with reference to the form of embodiment provided with connector holders, it also being hinged to the first plate element 301 which comprises frontally receiving holes for fixing the connection plate 103 in a manner entirely similar to what has already been described above. Also in this case, the attachment of the connecting plate 103 to the first plate element 301 is advantageously carried out by means of fixing screws 104, however, in accordance with this second embodiment the connecting plate 103 is advantageously fixed not to a connector holder but to a secure body 339 which comprises a rear groove 308 and threaded holes 308a in correspondence with the sides which laterally delimit said rear groove 308.

[0081] The secure body 339 is then secured to the plate by sliding it from top to bottom as described above with reference to the connector holder 130, and is then secured by inserting the threaded grub screws 108b into the threaded holes 308a as shown in Figure 23.

[0082] On the secure body 339 there is a lock / unlock button 122 of the cap as already described with reference to the connector holder.

[0083] The operation of the locking system and the cap is therefore entirely analogous to what has already been described for the version with external connector-holder; therefore the detailed description is not repeated here.

[0084] It has thus been shown how the multi-plate connection device according to the present invention ensures a secure, stable connection protected from accidental opening, while at the same time maintaining the seal against external agents such as water and dust and compensating for any pressure variations between the plates.

[0085] The multi-plate connection device thus conceived is susceptible to numerous modifications and variations all within the scope of the inventive concept.

[0086] Furthermore, all details may be replaced by other technically equivalent elements. The materials used, provided they are compatible with the specific use, as well as the contingent dimensions and shapes may be any as required.

Claims

CLAIMS1. A multi-connection plate device (1) of the cam (150) and lever (160) type for simultaneously connecting a plurality of hydraulic lines for pressurized fluids, said device comprising a fixed multi -connection element (100, 300) in turn comprising a first plate element (101, 301) supporting a corresponding plurality of female quick-release couplings (10) for connection to the hydraulic circuit of a user machine and a second movable multiconnection element (200) in turn comprising a second plate element (201) supporting a corresponding plurality of male quick-release couplings (20) suitable for connection to the hydraulic circuit of a utility, said multi-connection device (100, 300), the device further comprising:- a closing cover (109, 309) movable between an open position in which said plurality of female couplings (10) located on said first plate element (101, 301) are accessible from the outside, and a closed position in which said plurality of female couplings (10) located on said first plate element (101, 301) are not accessible from the outside;- at least one first connector plate (103) removably associated with said first plate element (101, 301);- a first connector body (130) or a secure body (339) removably associated with said first connection plate (103);- wherein said first connection plate (103) is configured to fit into a receiving groove (108, 308) of said connector-holder element (130), or of said secure body (339), which in turn comprise a closing cover device (109, 309).

2. Multi -connector plate device (1) according to the preceding claim, characterized in that it further comprises at least one electrical connector device (400) in turn comprising said first connector holder body (130) associated with said fixed multi-connector element (100), and a second connector holder (230) associated with said movable multi-connector element (200), and wherein said second connector-holder (230) is associated with said second plate element (201) by means of a second connection plate (203) connected to said second plate element (201), on the body of said second connector-holder (230) being obtained a second receiving groove (208) apt to receive said second connection plate (203).

3. Multi-connection plate device (1) according to the preceding claim, characterized in that on said first connection plate (103) a plurality of through holes (103a) for the insertion of fixing screws (104) is obtained, said first connection plate (103) being fixed to said first plate element (101) by means of a plurality of first fixing screws (104) suitable for inserting in corresponding first receiving holes (102) obtained in said first plate element (101).

4. Multi-connection plate device (1) according to the preceding claim, characterized in that on said second connecting plate (203) a plurality of second through holes (203a) for inserting second fastening screws (204) are obtained, said second connecting plate (203) being fixed to said second plate element (201) by means of a plurality of second fastening screws (204) apt to be inserted in corresponding second receiving holes (202) obtained in said second plate element (201).

5. Multi-connection plate device (1) according to one or more of the preceding claims, characterized in that said lid (109) is hinged to said first plate element (101) in correspondence with said hinge elements (109a), torsional springs (109b) apt to maintain said lid (109) in an open position being provided in correspondence with said hinge elements (109a).

6. Multi-connection plate device (1) according to the preceding claim, characterized in that it further comprises, on the body of said first hinge-holder (130) associated with said first plate element (101), a push-button retaining system (120) of said closing cover (109) capable of selectively keeping said closing cover (109) in the closed position or allowing its opening.

7. Multi-connection plate device (1) according to the preceding claim, characterized in that said push-button retaining device (120) for retaining said closing cover (109) in the closed position comprises in turn a first inner tab (123) and a second outer tab (124), adjacent to each other and in turn rotationally connected to the body of said first connector-holder (130) or secure body (339) by means of a cylindrical pin (125), and maintained in a rest position, corresponding to the holding condition of said lid (109) in the closed position, by a helical spring (126) acting between said first inner tab (123) and the inner body of said first connector-holder (130) or secure body (339).

8. Multi-connection plate device (1) according to the preceding claim, wherein said first inner tab (123) comprises, in correspondence with its upper end, a striker element (123a) capable of interacting with said closing cover (109) opposing the action of said torsional springs (109b) so as to keep said cover (109) in its closed position when said first and second tabs (123, 124) are in their rest position and said lock / unlock button (122) is not operated.

9. Multi-connection plate device (1) according to any preceding claim, characterized in that said outer tab (124) of said pushbutton latch (120) is slidingly associated with said inner tab (123), and by the fact that when said pushbutton retaining device (120) is assembled to said connector holder element (130) or to said secure body (339), said outer tab (124) is movable between a first locking position in which rotation of said inner tab (123) and outer tab (124)around the axis of said cylindrical pin (125) is allowed and a second locking position, in which said rotation about the axis of said cylindrical pin (125) is prevented by the fact that the lower end (124a) of said outer tab (124) is blocked in the rotation movement by the contact with a striker (130') obtained internally to the connector body (130), or to the secure body (339), thus ensuring the locking in the closed condition of said cover (109) which is held in closed position by said striker element (123a) of said inner tab (123).

10. Multi-connection plate device (1) according to any preceding claim, wherein said pushbutton retaining device (120) further comprises a lock / unlock button (122) operable by the user and capable of moving in translation said outer tab (124) between said first unlocking position in which rotation of said inner tab (123) and outer tab (124) about the axis of said cylindrical pin (125) is allowed, and said second locking position in which said rotation is prevented, so as to selectively allow / prevent the opening of the cover (109).

11. Multi-connection plate device (1) according to one or more of the preceding claims, characterized in that said locking lid (109) comprises at least a first portion (109a) conformed so as to surmount, in the closed position, said first plate element (101), and at least a second portion (109b) conformed so as to surmount, in a closed position, the upper portion of said first connector-holder (130), said second portion (109b) of said closure cover (109) further comprising a first gasket (129) suitable to be inserted within said first connector-holder (130) so as to realize and ensure the water and dust tightness of the closure of said first connector-holder (130).

12. Multi-connection plate device (1) according to the preceding claim, further comprising a second gasket (129') assembled on said second connector holder (230) and apt to be inserted within said first connector holder (130) so as to realize and guarantee the water and dust tightness of said first connector holder (130) when said multi-connection elements (100, 200, 300) are in coupled condition.

13. Multi-connection plate device (1) according to the preceding claim, characterized in that it further comprises a third gasket (110) placed in correspondence with said first portion (109') of the closing cover (109) and apt to surmount, in a closed position, said first plate element (101) so as to protect said plurality of female couplings (10) housed in said first plate element (101).

14. Multi-connection plate device (1) according to the preceding claim, characterized in that said third gasket (110) is made of foam rubber sponge.

15. Multi-connection plate device (1) according to one or more of the preceding claims, characterized in that it further comprises a compensation system for the separation gapbetween said first plate element (101) and said second plate element (201), said compensation system comprising elastic means (136) acting between said first connector holder (130) and said second connector holder (230), and suitable for moving one of said first (130) or said second (230) connector-holder against the other, so as to ensure the electrical connection of said connector (400) by counteracting the effect of the mutual displacement of said first connector-holder (130) and said second connector-holder (230) caused by the presence of oil under pressure in the hydraulic male (20) and female (10) couplings.

16. Multi -connector plate device (1) according to any preceding claim, wherein said separation gap compensation system between said first plate element (101) and said second plate element (201) further comprises, on said first connector-holder element (130), a first support frame (131) on which said one or more modular connectors (132) supporting in turn female electrical contacts (133) and more support elements (135) supporting as many helical springs (136) suitable to act between said first support frame (131) of said first connector-holder element (130) and said second connector-holder element (230), exerting a force in the direction of the reciprocal movement of said first support frame (131) supporting said modular connectors (132) from said first connector holder (130).

17. Multi-connection plate device (1) according to the preceding claim, characterized in that it further comprises, housed in said first connector holder (130), a retaining plate (137) fixed to said first connector holder (130) by means of fixing screws (138) and capable of limiting the stroke of said first support frame (131) with respect to said first connector holder (130), under the thrust of said helical springs (136).

18. Multi-connection plate device (1) according to the preceding claim, wherein said system for compensating the separation gap between said first plate element (101) and said second plate element (201) further comprises, on said second connector-holder (230), a second support frame (231) suitable for housing one or more modular connectors (232) supporting in turn male electrical contacts (233), said one or more connecting screws (234) being provided for fixing said second support frame (231) to said second connector-holder (230).

19. Multi-connection plate device (1) according to one or more of the preceding claims, characterized in that said first fixed multi-connection element (300) comprises a first plate element (301) within which said at least one electrical connector (337) is directly inserted, and a closing cover (309) comprising at least a first portion (309') suitable to surmount said first plate element (301) realizing the water and dust tightness of said plate and said plurality of female quick-release couplings (10) and said at least one electrical connector (337).

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