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A hydraulic coupling device is connected to a multi-line hose comprising a plurality of hydraulic lines housed within a flexible sheath. The coupling device comprises a cylindrical nut, a plurality of plug pins housed within the nut, and means for holding the plug pins within the nut. The plug pins

A hydraulic coupling device is connected to a multi-line hose comprising a plurality of hydraulic lines housed within a flexible sheath. The coupling device comprises a cylindrical nut, a plurality of plug pins housed within the nut, and means for holding the plug pins within the nut. The plug pins are each connectible to a respective line of the hose. The holding means comprises a holding disc, a retaining disc, and a sleeve. The sleeve is connected to the sheath of the multi-line hose. Each of the plug pins is provided with a pair of longitudinally-spaced collars which define therebetween a peripheral groove. The retaining disc is provided with a respective aperture for each of the plug pins. Each of the apertures has a diameter which is slightly greater than the diameter of one of the collars of the associated plug pin. The holding disc is provided with a plurality of radial slots. The peripheral groove of each plug pin engages within a respective radial slot of the holding disc. The collars of each plug pin are positioned on opposite sides of the holding disc, thereby limiting relative longitudinal movement of that plug pin relative to the holding disc. Said one collar of each plug pin is positioned within the associated aperture of the retaining disc.

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1. A hydraulic coupling device for a multi-line hose comprising a plurality of hydraulic lines (1) adapted to be housed within a flexible sheath, the coupling device comprising a casing (3), a plurality of plug pins (9) housed within the casing, and means for holding the plug pins within the casing,

1. A hydraulic coupling device for a multi-line hose comprising a plurality of hydraulic lines (1) adapted to be housed within a flexible sheath, the coupling device comprising a casing (3), a plurality of plug pins (9) housed within the casing, and means for holding the plug pins within the casing, the plug pins each being connected to a respective line of the hose, the holding means comprising a holder (15), a retainer (14), and a sleeve (5), wherein each of the plug pins includes a pair of longitudinally-spaced collars (11, 12) which define therebetween a peripheral groove (13), wherein the retainer includes a respective aperture (16, 17, 18) for each of the plug pins, each of said apertures having a diameter which is slightly greater than the diameter of one of the collars of the associated plug pin, and wherein the holder includes a plurality of slots (19, 20, 21), the peripheral groove of each plug pin engaging within a respective slot of the holder, the collars of each plug pin being positioned on opposite sides of the holder thereby limiting relative longitudinal movement of that plug pin relative to the holder, and said one collar of each plug pin being positioned within the associated aperture of the retainer. 2. A hydraulic coupling device according to claim 1, wherein the retainer is a retaining disc, and the holder is a holding disc, both of said discs having flat parallel opposed faces. 3. A hydraulic coupling device according to claim 2, wherein the retaining disc and the holding disc are detachably held together in face-to-face contact. 4. A hydraulic coupling device according to claim 3, wherein the retaining disc and the holding disc are detachably connected by a plurality of off-centre screw-threaded members 24. 5. A hydraulic coupling device according to claim 2, wherein the retaining disc has the same diameter as the holding disc. 6. A hydraulic coupling device according to claim 2, wherein the retaining disc has the same thickness as the holding disc. 7. A hydraulic coupling device according to claim 2, wherein the retaining disc and the holding disc are made of metal. 8. A hydraulic coupling device according to claim 2, wherein the slots in the holding disc are radial slots. 9. A hydraulic coupling device according to claim 8, wherein one of the slots 21 in the holding disc extends from the periphery of the holding disc to the central region thereof, said one slot accommodating two plug pins, one of which is positioned at the centre of the holding disc, the other being positioned on a common pitch circle with the rest of the plug pins. 10. A hydraulic coupling device according to claim 9, wherein the retaining disc has a separate aperture 16, 17 for each of the two plug pins positioned within said one slot. 11. A hydraulic coupling device according to claim 10, wherein each of the slots in the holding disc has a generally semi-circular base 22 and a portion 23 which diverges towards the periphery of the disc, the bases of the slots being engageable with the peripheral grooves of the plug pins. 12. A hydraulic coupling device according to claim 9, wherein at least two of the plug pins positioned on the common pitch circle have a greater diameter than the other plug pins, and project further beyond the retaining disc than said other plug pins. 13. A hydraulic coupling device according to claim 2, wherein the composite disc constituted by the retaining disc and the holding disc is held within the casing between an internal shoulder 27 formed within the casing and an annular flange 6 formed on the adjacent end of the sleeve by means of a screw-threaded ring, 8 said ring surrounding said end of the sleeve and being screwed into an internal thread provided within the casing. 14. A hydraulic coupling device according to claim 1, wherein the casing is a cylindrical nut.