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Title:
QUICK COUPLING DEVICE.
Document Type and Number:
WIPO Patent Application WO/2017/220472
Kind Code:
A1
Abstract:
Quick coupling device (1) comprising a first supporting plate (2) comprising a through opening (200) and at least one first connector (3) which is adapted to slide inside said at least one through opening (200), comprising at least one engagement means (4) adapted to integrally engage the first connector (3) in one sense and comprising at least one bushing (5) separately mountable with the first connector (3) which enters into contrast with said supporting plate (2) to lock said first connector (3) in the other sense.

Inventors:
MILESI, Giancarlo (Via Ligabue 2, RIVOLTA D'ADDA, 26027, IT)
GATTI, Gianmarco (Viale Piave, 1/C, POGNANO, 24040, IT)
BACCARO, Riccardo (Via Padre Tobia Corna 35, BRIGNANO GERA D'ADDA, 24053, IT)
ALLEVI, Matteo (Via Misericordia 6, MISSAGLIA, 23873, IT)
Application Number:
EP2017/064896
Publication Date:
December 28, 2017
Filing Date:
June 19, 2017
Export Citation:
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Assignee:
STUCCHI S.P.A. (Via Galileo Galilei 1, BRIGNANO GERA D'ADDA, 24053, IT)
International Classes:
F16L37/14; F16L37/56
Foreign References:
US4915419A1990-04-10
EP1024324A22000-08-02
US20140097614A12014-04-10
US3512808A1970-05-19
DE20212265U12003-12-18
EP2818596A22014-12-31
US4915419A1990-04-10
Attorney, Agent or Firm:
MITTLER, Andrea et al. (Viale Lombardia 20, MILANO, 20131, IT)
Download PDF:
Claims:
CLAIMS

1. Quick coupling device (1) comprising a first supporting plate (2) and at least one first connector (3), said supporting plate (2) is adapted to mount a multiplicity of first connectors (3), said at least one first connector (3) is adapted to connect to a respective second complementary connector along a longitudinal axis (L), said first connector (3) and said second connector are joined by their rear ends to respective pipes of a hydraulic circuit, said at least one first connector (3) connected to said second connector allows a passage of hydraulic circuit fluid into the quick coupling device (1), said supporting plate (2) comprises at least one through opening (200) arranged along said longitudinal axis (L), said at least one first connector (3) is mounted with said supporting plate (2) being slidingly inserted into said at least one through opening (200) of said supporting plate (2) from the rear part of said supporting plate (2) along the longitudinal axis (L) in frontal direction, said at least one first connector (3) is adapted to pass from a disengagement position of the first connector (3) outside said supporting plate (2) to a multiplicity of insertion positions of the first connector (3) inside said at least one through opening (200) of the supporting plate (2) and to an engagement position of the first connector (3) with said supporting plate (2), the disengagement position of the first connector (3) provides that the first connector (3) is outside the through opening (200), each insertion position of said multiplicity of insertion positions of the first connector (3) provides that said first connector (3) has at least one portion inside the through opening (200), the engagement position of said first connector (3) provides that said first connector (3) is integrally engaged with said supporting plate (2), said quick coupling device (1) comprises at least one engagement means (4), which is adapted to pass from a disengagement position of the engagement means (4) with the first connector (3) to an engagement position of the engagement means (4) with the first connector (3), the disengagement position of the engagement means (4) provides that said first connector (3) slides inside the through opening (200) passing from the disengagement position of the first connector (3) to a multiplicity of insertion positions of the first connector (3) inside the through opening (200) of said supporting plate (2), the engagement position of the engagement means (4) provides that said engagement means (4) integrally engage the first connector (3) to lock said first connector (3) at the engagement position of the first connector (3), said quick coupling device (1) comprises at least one bushing (5), the diameter of said at least one bushing (5) is larger than the diameter of a front end (30) of said first connector (3), said at least one bushing (5) is separately mountable with the front end (30) of the first connector (3), characterized in that said at least one bushing (5) is integrally mounted with the front end (30) of the first connector (3) when the first connector (3) is in one of the insertion positions of the first connector (3) and said front end (30) of the first connector (3) protrudes outside the through opening (200) in frontal direction along the longitudinal axis (L), said at least one bushing (5) mounted with said first connector (3) locks the sliding of said first connector (3) along the longitudinal axis (L) in rear direction entering into contrast with said supporting plate (2) and preventing the first connector (3) from passing to the disengagement position of the first connector (3), said engagement means (4) locks the sliding of said first connector (3) along the longitudinal axis (L) in frontal direction locking said first connector (3) in the engagement position of the first connector (3) when said at least one bushing (5) mounted with said first connector (3) enters into contrast with said supporting plate (2).

2. Quick coupling device (1) according to the claim 1, characterized in that said at least one bushing (5) consists of at least two half-bushings (55) which are separately mountable with each other.

3. Quick coupling device (1) according to anyone of the claims 1 or 2, characterized in that said front end (30) of the first connector (3) comprises at least one housing (35) for said at least one bushing (5), said at least one bushing (5) is adapted to be integrally mounted with said at least one housing (35) of the front end (30) of the first connector (3).

4. Quick coupling device (1) according to the claim 3, characterized in that said at least one bushing (5) has an L-shaped section, a radial portion (53) of said at least one bushing (5) is adapted to be separately mountable with said at least one housing (35) of the front end (30) of the first connector (3).

5. Quick coupling device (1) according to anyone of the claims 1-4, characterized in that said through opening (200) of the supporting plate (2) comprises a front portion (250) having a diameter larger than the rest of the through opening (200), said front portion (250) houses said at least one bushing (5) mounted with the front end (30) of said first connector (3), said front portion (250) of the through opening (200) of the supporting plate (2) forms a step (25) with the rest of the through opening (200), said step (25) of the supporting plate (2) is adapted to enter into contrast with said at least one bushing (5) mounted with the front end (30) of the first connector (3) locking the sliding of said first connector (3) along the longitudinal axis (L) in rear direction.

6. Quick coupling device (1) according to anyone of the claims 1-5, characterized in that said supporting plate (2) comprises a through cavity

(240) which communicates with said at least one through opening (200) of the supporting plate (2), said engagement means (4) is adapted to be inserted inside the through cavity (240) to engage the first connector (3) at said engagement position of the engagement means (4) with the first connector (3) when said at least one bushing (5) mounted with the front end (30) of the first connector (3) is in contrast with said supporting plate (2) locking the sliding of said first connector (3) along the longitudinal axis (L) in rear direction.

7. Quick coupling device (1) according to the claim 6, characterized in that said through cavity (240) is arranged toward a radial direction with respect to the through opening (200) of the supporting plate (2).

8. Quick coupling device (1) according to the claim 6, characterized in that said through cavity (240) is placed along a perpendicular direction with respect to the longitudinal axis (L) and the through opening (200) of the supporting plate (2).

9. Quick coupling device (1) according to any one of the claims 6-8, characterized in that said first connector (3) comprises at least one housing seat (34) for said engagement means (4), so that when said at least one bushing (5) mounted with the front end (30) of the first connector (3) is in contrast with said supporting plate (3) locking the sliding of said first connector (3) along the longitudinal axis (L) in rear direction, said engagement means (4) enters into contrast with said housing seat (34) of the first connector (3) engaging the engagement means (4) in said engagement position of the engagement means (4) with the first connector (3) and locking the sliding of said first connector (3) along the longitudinal axis (L) in frontal direction.

10. Quick coupling device (1) according to any one of the claims 6-9, characterized in that said engagement means (4) comprise a cylindrical element (40), said cylindrical element (40) is adapted to be inserted inside said through cavity (240) of the supporting plate (2) until an end of the cylindrical element (40) of the engagement means (4) engages the first connector (3) and said cylindrical element (40) engages said through cavity (240) to keep said cylindrical element (40) in place engaged with said first connector (3) at the engagement position of the first connector (3).

11. Quick coupling device (1) according to any one of the preceding claims 1-5, characterized in that said engagement means (4) is mounted only with said frontal portion (30) of said first connector (3) when said at least one bushing (5) is mounted with the front end (30) of the first connector (3) and the first connector (3) is made to slide along the longitudinal axis (L) in rear direction until said at least one bushing (5) is in contrast with said supporting plate (2) locking the sliding of said first connector (3) along the longitudinal axis (L) in rear direction, said engagement means (4) locks the sliding of said first connector (3) along the longitudinal axis (L) in frontal direction.

12. Quick coupling device (1) according to claim 11, characterized in that said engagement means (4) is larger than said at least one bushing (5), said engagement means (4) by screwing onto the front portion (30) of said first connector (3) enters into contrast both with a front portion of said at least one bushing (5) and with a front portion of said supporting plate (2), said engaging means (4) being screwed against said front portion of said at least one bushing (5) and against said front position of said supporting plate

(2) locks the sliding of said first connector (3) along the longitudinal axis (L) in frontal direction.

13. Quick coupling device (1) according to claim 11, characterized in that said engagement means (4) comprises a snap ring and a groove of the first connector 3, said snap ring being adapted to be fixed by fitting with said complementary shaped groove, said groove is provided on the front portion (30) of said first connector (3), said engagement means (4) is adapted to fix said first connector (3) to said supporting plate (2) when said first connector

(3) is made to slide along the longitudinal axis (L) in rear direction and said at least one bushing (5) mounted on said first connector (3) enters into contrast with said supporting plate (2) preventing the first connector (3) from passing to the disengagement position of the first connector (3).

14. Quick coupling device (1) according to any one of the claims 1-13, characterized in that said at least one first connector (3) comprises a rear portion (31), said rear portion (31) comprises a bond (32) having a diameter larger than that of said through opening (200) of the supporting plate (2) such that said first connector (3) can slide inside the through opening (200) of the supporting plate (2) in frontal direction along the longitudinal axis (L) passing to said multiplicity of insertion positions of the first connector (3) until said bond (32) of the rear portion (31) enters into contrast with a rear edge (22) of the through opening (200) of said supporting plate (2) locking the sliding of said first connector (3) along the longitudinal axis (L) in frontal direction.

Description:
"Quick coupling device"

* * *

The present invention relates to a quick coupling device.

Quick coupling devices for connecting a multiplicity of connectors exist in the prior art, e.g. as described in DE-20212265-U1, in EP-2818596- A2 and in US-4915419. Said quick coupling device comprises a plate which mounts a multiplicity of connectors. Each connector is fixed to the plate by means of nuts. The nuts screw an outer bushing of the connector with a through opening of the plate.

US-4915419 fits the connectors using two blocks, the first arranged on the front portion of the plate and the second arranged on the rear portion of the plate. By screwing said two blocks onto the respective two front and rear portions of the plate, the connector remains coupled. Disadvantageously, the connector must be screwed by means of the first block, which is screwed to enter into contract with the front portion of the plate, and by means of the second block, which is screwed to enter into contact with the rear portion of the plate.

Disadvantageously, the nuts loosen during the operation of the quick coupling device because of the vibrations to which they are subjected during the passage of liquids in the pipes joined by the connectors in the coupling.

It is the object of the present invention to make a quick coupling device which is quicker to mount, easier to assemble, resistant to the vibrations of the pressurized fluid which runs in the hydraulic circuit and in the quick coupling device, which does not loosen the connection between connector and supporting plate of the quick coupling device, which is safer and keeps the connector in position along a longitudinal axis.

In accordance with the invention, such object is achieved by a quick coupling device according to claim 1.

These and other features of the present invention will be more apparent from the following detailed description of a practical embodiment thereof, shown by way of non-limitative example in the accompanying drawings, in which:

Figure 1 shows a perspective view of a quick coupling device comprising a plate which mounts connectors in a joined position according to the present invention;

Figure 2 shows a front view of the quick coupling device;

Figure 3 shows a section view taken along line III- III in Figure 2 with the connector mounted with the plate in the joined position;

Figure 4 shows an exploded perspective view of the quick coupling device comprising a lock pin and a safety dowel pulled out of the plate in a disengagement position of the quick coupling device;

Figure 5 shows a perspective view of the quick coupling device in said disengagement position and with the connector made to slide forwards to disengage the two fixing bushings in a disengaged position;

Figure 6 shows a section view taken along line III- III in Figure 2 where the quick coupling device is in the position shown in Figure 5;

Figure 7 shows a perspective view of the quick coupling device with the connector pulled out of the plate;

Figure 8 shows a section view taken along the line III-III in Figure 2 where the quick coupling device is in the position shown in Figure 7;

The figures listed above show a quick coupling device 1 comprising a first supporting plate 2 and at least one first connector 3.

Said supporting plate 2 is adapted to mount a multiplicity of first connectors 3. Figures 1, 4-5, 7 show an example of embodiment of the quick coupling device 1, which is a multiple quick coupling device 1, comprising three first connectors 3, which are male connectors 3.

Said at least one first connector 3 is adapted to connect with a respective second complementary connector (not shown in the figures) along a longitudinal axis L. Said second complementary connector may be mounted either with a second plate of a second connector or directly with a second plate of a vehicle.

If, as shown in figures 1-8, the first connector 3 is a male connector, then the second connector is female. The first connector 3 may be a female connector and consequently the second connector must be male to allow the connection between the first connector 3 and the second connector. Said second connector is mounted on a second supporting plate and is adapted to be mounted with pipes of a hydraulic circuit.

The hydraulic circuit is a hydrodynamic hydraulic circuit.

Said supporting plate 2 comprises a front face 21 and a rear face 22.

Said first connector 3 and said second connector are joined by their rear ends to respective pipes of a hydraulic circuit.

Said at least one first connector 3 connected to said second connector allows a passage of hydraulic circuit fluid into the quick coupling device 1.

Said supporting plate 2 comprises at least one through opening 200. Said through opening 200 develops along a longitudinal axis L.

The first connector 3 mounting the pipe of the hydraulic circuit is mounted with the supporting plate 2 being inserted by the rear part of the supporting plate 2 in direction of the longitudinal axis L and protruding outside the front part of the supporting plate 2 by at least one front position 30 of the first connector 3. Said front portion 30 is adapted to connect to a respective and complementary front portion of the second connector. It is worth noting that the first connector 3 is mounted with the supporting plate 2 being slidingly inserted in the through opening 200 of said supporting plate 2 from the back along the longitudinal axis L in frontal direction. It is worth noting that the first connector 3 must be necessarily inserted from the rear because the rear part of the first connector 3 is connected to the pipes of the hydraulic circuit.

Said at least one first connector 3 is adapted to pass from a disengagement position of the first connector 3 outside said supporting plate 2 (figures 7, 8) to a multiplicity of insertion positions of the first connector 3 inside said at least one through opening 200 of the supporting plate 2 (figures 4-6) and to an engagement position of the first connector 3 with said supporting plate 2 (figures 1-3). As shown in figures 7-8, the disengagement position of the first connector 3 provides that the first connector 3 is outside the through opening 200. As show in figures 4-6, each insertion position of said multiplicity of insertion positions of the first connector 3 said first connector 3 has at least one portion inside the through opening 200. As shown in figures 1-3, the engagement position of said first connector 3 provides that said first connector 3 is integrally engaged with said supporting plate 2.

In particular, as shown in figures 3, 4, said quick coupling device 1 comprises at least one engagement means 4, which is adapted to pass from a disengagement position of the engagement means 4 with the first connector 3 (figures 4-8) to an engagement position of the engagement means 4 with the first connector 3 (figures 1-3). As shown in figures 4-8, the disengagement position of the engagement means 4 provides that said first connector 3 slides inside the through opening 200 passing from the disengagement position of the first connector 3 to a multiplicity of insertion positions of the first connector 3 inside the through opening 200 of said supporting plate 2. As shown in figures 1-3, the engagement position of the engagement means 4 provides that said engagement means 4 integrally engages the first connector 3 to lock said first connector 3 at the engagement position of the first connector 3. It is worth noting that the engagement means 4 locks the sliding of the first connector 3 along the longitudinal axis L in frontal direction.

Said supporting plate 2 comprises a through cavity 240 in communication with said at least one through opening 200 of the supporting plate 2.

Said through cavity 240 of the supporting plate 2 opens on an outer surface of the supporting plate 2 putting the outside into communication with the through opening 200 of the supporting plate. Said engagement means 4 is adapted to be inserted inside the through cavity 240 to engage with the first connector 3 in said engagement position of the engagement means 4 with the first connector 3 when said at least one bushing 5 mounted with the front end 30 of the first connector 3 is in contrast with said supporting plate 2. It is worth noting that once said at least one bushing 5 is mounted with the front end 30 of the first connector and the first connector is made to slide along the longitudinal axis L in rear direction until said at least one bushing 5 contrasts with the front portion of the supporting plate 2, the engagement means 4 locks the sliding of the first connector 3 along the longitudinal axis in frontal direction. In this manner, the first connector 3 remains in engagement position there being the synergistic locking of said at least one bushing 5 which locks the sliding of the first connector 3 along the longitudinal axis in frontal direction and the locking of said engagement means 4 which locks the sliding of the first connector 3 along the longitudinal axis L in rear direction.

As shown in particular in figures 3-4, said through cavity 240 is arranged along a perpendicular direction with respect to the longitudinal axis L and is tangential with respect to the through opening 200 of the supporting plate 2.

Said first connector 3 comprises at least one housing seat 34 for said engagement means 4, so that by entering into contrast with said housing seat 34 of the first connector 3 said engagement means 4 engages the engagement means 4 in said engagement position of the engagement means 4 with the first connector 3 in advantageously solid and resistance manner.

Said housing seat 34 of the first connector 3 is a groove 34 provided on an outer bushing of the first connector 3.

As shown in figure 4, said engagement means 4 comprises a cylindrical element 40 and a safety dowel 41, said cylindrical element 40 is adapted to be inserted inside said through cavity 240 of the supporting plate 2 until an end of the cylindrical element 40 of the engagement means 4 engages with the first connector 3 and said safety dowel 41 engages with said through cavity 240 to keep said cylindrical element 40 in place engaged with said first connector 3 at the engagement position of the first connector 3.

As shown in particular in figures 5-8, said quick coupling device 1 comprises at least one bushing 5. The diameter of said at least one bushing 5 is larger than the diameter of a front end 30 of said first connector 3. Said at least one bushing 5 is separately mountable with the front end 30 of the first connector 3. Said at least one bushing 5 is integrally mounted with the front end 30 of the first connector 3 when the first connector 3 is an insertion position of the first connector 3 and said front end 30 of the first connector 3 protrudes outside the through opening 200 in frontal direction along the longitudinal axis L. It is worth noting that said at least one bushing 5 is mounted only with the front end 30 of the first connector 3. When said at least one bushing 5 is mounted with said first connector 3, said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3 locking the sliding of the first connector 3 along the longitudinal axis L in rear direction. Said engagement means 4 locks said first connector 3 at the engagement position of the first connector 3 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2. In this manner, said at least one bushing 5 mounted with said first connector 3 locks the sliding of the first connector 3 along the longitudinal axis L in rear direction. The engagement means 4 locks the sliding of the first connector 3 along the longitudinal axis L in frontal direction. Advantageously, the possibility is maintained for the first connector 3 to turn about the longitudinal axis L. Advantageously, the quick coupling device 1 is faster to assemble and the locking of the first connector 3 is faster and easier.

As shown in figures 5-8, said at least one bushing 5 consists of at least two half-bushings 55 which are separately mountable with each other. Said half -bushings 55 are shaped as a crescent-like circular crown.

Said front end 30 of the first connector 3 comprises at least one housing 35 for said at least one bushing 5, said at least one bushing 5 is adapted to be integrally mounted with said at least one housing 35 of the front end 30 of the first connector 3.

Advantageously, when the first connector 3 is free to slide along the longitudinal axis L in frontal direction, said two half-bushings 55 can be mounted directly with the housing 35 of the front portion 30 of the first connector 3, making the assembly of said at least one bushing 5 even easier and the assembly of the quick coupling device 1 even faster.

Said housing 35 is a groove of the outer bushing of the first connector 3.

As shown in particular in figures 5-6, said at least one bushing 5 has an L-shaped section, a radial portion 53 of said at least one bushing 5 is adapted to be separately mountable with said at least one housing 35 of the front end

30 of the first connector 3. Advantageously, said radial portion 53 makes it possible to fix said at least one bushing 5 better inside the housing 35 of the front portion 30 of the first connector 3.

As shown in particular in figures 3, 6, 8, said through opening 200 of the supporting plate 2 comprises a front portion 250 of larger diameter than the rest of the through opening 200. Said front portion 250 houses said at least one bushing 5 mounted with the front end 30 of said first connector 3. Said front portion 250 of the through opening 200 of the supporting plate 2 forms a step 25 with the rest of the through opening 200, said step 25 of the supporting plate 2 is adapted to enter into contrast with said at least one bushing 5 mounted with the front end 30 of the first connector 3.

Advantageously, said front portion 250 makes it possible to make the entire dimension of said at least one bushing 5 enter inside the housing, keeping the planarity of the front face 21 of the supporting plate 2. Said first connector 3 slides along the longitudinal axis L in rear direction until a rear face 52 of said at least one bushing 5 enters into contrast with said step 25. Advantageously, the quick coupling device 1 has flat faces when said front portion 250 of the through opening 200 of the supporting plate 2 is provided, which is adapted to house said at least one bushing 5 mounted with the front portion 30 of the first connector 3.

Advantageously, in order to lock the movement of the first connector 3 along the longitudinal direction L in frontal direction, said at least one first connector 3 comprises a rear portion 31 and said rear portion 31 comprises a bond 32 having a diameter larger than that of said through opening 200 of the supporting plate 2, so that said first connector 3 can slide inside the through opening 200 of the supporting plate 2 in frontal direction along the longitudinal axis L passing to said multiplicity of insertion positions of the first connector 3 until said bond 32 of the rear portion 31 enters into contrast with a rear edge 22 of the through opening 200 of said supporting plate 2 locking the sliding of said first connector 3 along the longitudinal axis L in frontal direction. It is worth noting that said bond 32 is a retainer which is not used to lock the first connector 3 in engagement position with the supporting plate 2, but is only used to lock the complete passage of the first connector 3 and of the pipe connected to the hydraulic circuit by means of the through opening 200 along the longitudinal axis L in frontal direction.

With regards to the operation of said quick coupling device 1, in order to engage said first connector 3 with said supporting plate 2, said first connector 3 is inserted from the rear in the through opening 200 of the supporting plate 2, constraining its movement by means of a bond 32 of greater diameter than the diameter of the rear edge of the through opening 200. Said first connector 3 by sliding through the through opening 200 makes at least its front portion 30 exit from the supporting plate 2 in frontal direction. Said at least one bushing 5 is mounted with said front portion 30 of the first connector 3, while the first connector 3 is inside the through opening 200 of the supporting plate 2. Once said at least one bushing 5 is mounted with the first connector 3, the first connector 3 is made to slide along the longitudinal axis L in rear direction until said at least one bushing 5 enters into contrast with said supporting plate 2, locking the movement of the first connector 3 in a rear direction.

At this point, the engagement means 4 engages with said first connector 3 also locking also the movement of the first connector 3 in the frontal direction and the first connector 3 is at the engagement position of said first connector 3 with said supporting plate 2 of the quick coupling device 1.

In order to disengage said first connector 3 outside the supporting plate 2 it is necessary to disengage said engagement means 4 from the first connector 3 (figure 4), make the first connector 3 slide along the longitudinal axis L in frontal direction, separating said at least one bushing 5 from the first connector 3 (figures 5-6) and finally make the first connector 3 slide again along the longitudinal axis L in rear direction until said first connector 3 is at the disengagement position outside the supporting plate 2 (figures 7-8).

Advantageously, the first connector 3 can be engaged and disengaged rapidly, safely and quickly with the supporting plate 2 of the quick coupling device 1.

Alternatively, said engagement means 4 may be comprised in a list of engagement means 4 with equivalent function comprising, for example, a pin, an apparatus comprising a snap ring and groove of the first connector 3, a retaining ring, a ring, bayonet means.

Said alternative pin 4 is adapted to fix the first connector 3 to said supporting plate 2 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2 preventing the first connector 3 from passing to the disengagement position of the first connector 3. Said alternative pin 4 is mounted with the front portion 30 of the first connector 3 and enters into contrast with the front portion of said at least one bushing 5 and with the front portion of said supporting plate 2. Said alternative pin 4 is never mounted with the rear portion of the first connector 3 and is not screwed until it enters into contrast with the rear portion of the supporting plate 2. It is worth noting that no locking means are mounted on the rear position of first connector 3 to lock the first connector 3 to the supporting plate 2; indeed, the synergistic action of at least one bushing 5, which is mounted only with the front portion 30 of the first connector 3 and the engagement means 4, is sufficient. It is worth noting that no locking means are mounted on the rear position of first connector 3 to lock the first connector 3 to the supporting plate 2; indeed, the synergistic action of at least one bushing 5, which is mounted only with the front portion 30 of the first connector 3 and the engagement means 4, is sufficient.

Said alternative pin 4 is larger than bushing 5. Said alternative pin 4 locks said first connector 3 to said supporting plate 2 when said at least one bushing 5 is mounted with said first connector 3 and by making the first connector 3 slide along the longitudinal axis in rear direction, said at least one bushing 5 enters into contrast with said supporting plate 2, preventing the first connector 3 from sliding along the longitudinal axis L in rear direction, preventing the first connector 3 from passing to the disengagement position. It is worth noting that said alternative pin 4 is screwed only to said front portion 30 of said first connector 3 and enters into contrast both with a front surface of said at least one bushing 5 and with a front portion of said supporting plate 2 when said at least one bushing 5 is mounted with the front end 30 of the first connector 3 and the first connector 3 is made to slide along the longitudinal axis L in rear direction until said at least one bushing 5 is in contrast with said supporting plate 2, locking the sliding of said first connector 3 along the longitudinal axis L in rear direction. It is worth noting that said engagement means 4 is screwed against said at least one bushing 5 and against said supporting plate 2 and locks the sliding of said first connector 3 along the longitudinal axis L in frontal direction. Said yet alternative engagement means 4 comprises a snap ring, which is fixed by fitting with a groove of complementary shape, said groove being provided on the outer bushing of the first connector 3. Said alternative engagement means 4 is adapted to fix the first connector 3 to said supporting plate 2 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3. Said groove is arranged on the frontal portion 30 of the first connector 3.

Said further alternative engagement means 4 has a retaining ring, which locks said first connector 3 to said supporting plate 2 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3. It is worth noting that said retaining ring 4 is mounted only on the front portion 30 of the first connector 3.

Said even further alternative engagement means 4 has a bayonet coupling, which is adapted to fix the first connector 3 to said supporting plate 2 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3. It is worth noting that said bayonet means 4 is mounted only on the front portion 30 of the first connector 3.

Alternatively, said through cavity 240 is arranged along an oblique direction with respect to the through opening 200 of the supporting plate 2, so that the engagement means 4 can engage with the first connector 3 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3.

Alternatively, said engagement means 4 comprises a cylindrical element 40, said cylindrical element 40 is adapted to be inserted inside said through cavity 240 of the supporting plate 2 until an end of the cylindrical element 40 of the engagement means 4 engages the first connector 3 and said cylindrical element 40 engages said through cavity 240 to keep said cylindrical element 40 in place engaged with said first connector 3 in the position of engagement of the first connector 3. Said cylindrical element 40 is screwed with said through cavity 240.

Still alternatively, said safety dowel 41 is replaced by a retaining ring or another equivalent element.

Alternatively, said through cavity 240 is arranged along a perpendicular direction with respect to the longitudinal axis L and the through opening 200 of the supporting plate 2, so that the engagement means 4 can engage with the first connector 3 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3.

Alternatively, said through cavity 240 is arranged along a radial direction with respect to the through opening 200 of the supporting plate 2, so that the engagement means 4 can engage with the first connector 3 when said at least one bushing 5 mounted with said first connector 3 enters into contrast with said supporting plate 2, preventing the first connector 3 from passing to the disengagement position of the first connector 3.

Alternatively, said housing seat 34 of the first connector 3 is a slot 34 provided on an outer bushing of the first connector 3.

Alternatively, said at least one bushing 5 mounted with said first connector 3 enters into contrast directly with the front face 21 of said supporting plate 2 preventing the first connector 3 from passing to the disengagement position of the first connector 3. In said alternative, there is no frontal portion 250 of the through opening 200.

Alternatively, said at least one bushing 5 may consist of a single piece which is separately mountable with the front portion 30 of the first connector 3.

Alternatively, said at least one bushing 5 may consist of a multiplicity of half-bushings 55 which are separately mountable with each other. In said alternative, said half -bushings 55 are circular sections of the bushing 5.

Alternatively, said housing 35 of the front portion 30 of the first connector 3 is a slot 35 provided on an outer bushing of the first connector 3. In said alternative, said at least one bushing 5 comprises at least one extension adapted to be integrally engaged with said slot 35.

Alternatively, the hydraulic circuit may be a hydraulic circuit of gas or other fluids.

It is worth noting that no engagement means 4 are mounted on the rear position of first connector 3 to lock the first connector 3 with the supporting plate 2; indeed, the synergistic action of at least one bushing 5, which is mounted only with the front portion 30 of the first connector 3 and the engagement means 4, is sufficient. The engagement means 4 is never mounted with the rear portion of the first connector 3.

Advantageously, said quick coupling device 1 according to the present invention is quicker to assemble, easier to assemble, resistant to vibrations of the pressurized fluid which runs in the hydraulic circuit and in the quick coupling device 1.

Advantageously, the quick coupling device 1 does not allow the loosening of the connection between first connector 3 and supporting plate 2 of the quick coupling device 1.

Advantageously, said quick coupling device 1 is safer and keeps the first connector 3 integrally in position inside the through opening 200 of the supporting plate 2 along the longitudinal axis without the first connector 3 having clearance to move inside the through opening 200.