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A hydraulic coupling device is provided for connection to a multi-line hose constituted by a plurality of hydraulic conduits bunched together. The coupling device comprises a casing, a plurality of plug pins housed within the casing, and a holder for holding the plug pins. The plug pins are each con

A hydraulic coupling device is provided for connection to a multi-line hose constituted by a plurality of hydraulic conduits bunched together. The coupling device comprises a casing, a plurality of plug pins housed within the casing, and a holder for holding the plug pins. The plug pins are each connectible to a respective conduit of the multi-line hose. The holder is constituted by at least two retaining discs, and each plug pin is provided with two circumferential grooves. The retaining discs are each provided with a respective aperture through which one of the plug pins passes. Portions of the retaining discs adjacent to the apertures can be tightly engaged within the grooves in the plug pins, by being radially displaced and/or rotated relative to one another. In this way, the plug pins are axially fixed relative to the retaining discs.

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1. A hydraulic coupling device for connection to a multi-line hose comprising a plurality of hydraulic conduits bunched together, the coupling device comprising: (a) a casing, a plurality of plug pins having at least one circumferential groove, and means for holding the plug pins within the casin

1. A hydraulic coupling device for connection to a multi-line hose comprising a plurality of hydraulic conduits bunched together, the coupling device comprising: (a) a casing, a plurality of plug pins having at least one circumferential groove, and means for holding the plug pins within the casing, (b) each plug pin is connectable to a respective conduit of the multi-line hose, (c) the holding means including at least two retaining discs which are displaceable with respect to each other and have groove engaging portions for tightly engaging within a groove of each plug pin, (d) said retaining discs being effective to axially fix the plug pins when said discs are displaced with respect to each other, and (e) means for maintaining the discs in their displaceable relationship with respect to each other within said casing. 2. A hydraulic coupling device according to claim 1, wherein the retaining discs are radially displaceable relative to one another for engaging said groove engaging portions within the groove of each of the plug pins. 3. A hydraulic coupling device according to claim 2, wherein the holding means includes two retaining discs, each plug pin includes two axially-spaced circumferential grooves, each retaining disc being associated with a respective groove of each of the plug pins. 4. A hydraulic coupling device according to claim 1, wherein the retaining discs are rotatable relative to one another for engaging said groove engaging portions within the groove in each of the plug pins. 5. A hydraulic coupling device according to claim 1, wherein each of the plug pins is a standard plug pin. 6. A hydraulic coupling device according to claim 1, wherein the retaining discs are radially displaceable with respect to each other, each of the retaining discs has a locking hole passing therethrough and said locking holes are aligned when the retaining discs have been radially displaced relative to one another, and said disc maintaining means includes a locking pin which passes through said locking holes to lock the retaining discs in the position in which the plug pins are axially fixed relative thereto. 7. A hydraulic coupling device according to claim 6, wherein said holding means includes a spacer disc which is sandwiched between the two retaining discs, the spacer disc includes apertures for the passage of the plug pins, and the plug pins are radially supported by the apertured portions of the spacer disc. 8. A hydraulic coupling device according to claim 7, wherein the spacer disc includes a respective hole for the passage of the locking pin. 9. A hydraulic coupling device according to claim 6, wherein the locking pin is a screw-threaded member. 10. A hydraulic coupling device according to claim 6, wherein the diameter of each of said locking holes is greater than twice the depth of the grooves in the plug pins plus the radius of the locking pin. 11. A hydraulic coupling device according to claim 6, wherein the locking pin includes a tapered free end portion. 12. A hydraulic coupling device according to claim 1, wherein the retaining discs are rotatable with respect to each other, said disc maintaining means includes a locking hole passing through each retaining disc and a locking pin, said locking holes being aligned when the retaining discs have been rotated relative to one another, and the locking pin passes through said locking holes to lock the retaining discs in the position in which the plug pins are axially fixed relative thereto. 13. A hydraulic coupling device according to claim 12, wherein there are three retaining discs, and the locking pin holds the retaining discs tightly together. 14. A hydraulic coupling device according to claim 1, wherein each of the plug pins is a male plug pin. 15. A hydraulic coupling device for connection to a multi-line hose comprising a plurality of hydraulic conduits bunched together, a coupling device comprising: (a) a casing, a plurality of plug pins having at least one circumferential groove, and means for holding the plug pins within the casing, (b) each plug pin is connectable to a respective conduit of the multi-line hose, (c) the holding means including at least two retaining discs each having a respective aperture through which each one of the plug pins passes and having groove engaging portions to be tightly engaged with a groove of each plug pin, (d) each of said apertures having a larger diameter than that of the respective groove in the associated plug pin, (e) said retaining discs being displaceable with respect to each other to axially fix the plug pins with said groove engaging portions, and (f) means for maintaining the discs in their displaceable relationship with respect to each other within the casing. 16. A hydraulic coupling device according to claim 15, wherein said groove engaging portions of the retaining discs are located adjacent said apertures through which the plug pins pass. 17. A hydraulic coupling device according to claim 16, wherein said groove engaging portions of the retaining discs are crescent-shaped and engage the groove of each of the plug pins along a crescent-shaped section thereof. 18. A hydraulic coupling device for connection to a multi-line hose comprising a plurality of hydraulic conduits bunched together, the coupling device comprising: (a) a casing having a inner and outer surface, (b) a plurality of plug pins having at least one circumferential groove, (c) means for holding the plug pins within the casing, (d) each plug pin is connectable to a respective conduit of the multi-line hose, (e) the holding means including at least two retaining discs which are displaceable with respect to each other and have grooved engaging portions for tightly engaging within the groove of each plug pin, (f) said discs being effective to axially fix the plug pins when said discs are displaced with respect to each other, and (g) means located on the inner surface of the casing for maintaining the discs in their displaced relationship with respect to each other. 19. A hydraulic coupling device according to claim 18, wherein said disc maintaining means includes at least one groove positioned on said inner surface to receive peripheral contacting portions of the retaining discs when the retaining discs have been displaced relative to one another. 20. A hydraulic coupling device according to claim 19, wherein said disc maintaining means includes at least two axially-shaped grooves on said inner surface, each retaining disc being associated with a respective groove in the inner surface of the facing. 21. A hydraulic coupling device according to claim 20, wherein said peripheral contacting portions are crescent-shaped and engage said grooves in the inner surface of the casing along said crescent sections thereof. 22. A hydraulic coupling device according to claim 18, wherein the casing is generally cylindrical. 23. A hydraulic coupling device according to claim 18, wherein the retaining discs are of reduced thickness in the regions of the groove engaging portions. 24. A hydraulic coupling device according to claim 23, wherein, the retaining discs are of reduced thickness in the regions of said peripheral contacting portions. 25. A hydraulic coupling device according to claim 18, wherein the width of each of the grooves in the inner surface of the casing is greater than the thickness of said peripheral contacting portion of the respective retaining disc. 26. A hydraulic coupling device as defined in claim 18, wherein said disc maintaining means includes at least one groove on the inner surface of the casing, the retaining discs include peripheral contacting portions for tightly engaging within said at least one groove in the inner surface of the casing when said discs are displaced relative to one another to axially fix the retaining discs relative to the casing. 27. A hydraulic coupling device according to claim 26, wherein the retaining discs are radially displaceable relative to one another for engaging said peripheral contacting portions within said at least one groove in the inner surface of the casing. 28. A hydraulic coupling device according to claim 26, wherein the retaining discs are rotatable relative to one another for engaging said peripheral contacting portions within said at least one groove in the inner surface of the casing.