Plug connection

1. A releasable plug connection, which is either in a connected or released state, comprising:

a jack, and

a plug,

wherein, in the connected state, the plug is inserted into the jack and held in it by a lug standing out with respect to the plug at an acute angle, for the purpose of which the lug is connected with the plug in a radially spring loaded manner and contacts a locking surface formed on the jack, as a result of which sliding back of the plug out of the jack is prevented,

wherein the locking surface extends largely radially to the longitudinal axis of the jack and the plug, and the jack consists of a hollow cylinder and a sleeve surrounding part of the hollow cylinder that can be displaced by relative axial sliding with respect to each other to a limited extent in an axial direction,

wherein the locking surface is formed on a flange at one end of the sleeve, and the hollow cylinder has a contact point for the lug which cooperates with the lug on pushing together of the hollow cylinder and the sleeve against the force of a spring acting in the axial direction, and

wherein the plug, to which the lug is connected, and the lug move relative to the jack so that the lug contacts the contact point and is pushed from the locking surface in a radial direction by sliding on the contact point to allow withdrawal of the plug from the jack.

2. The releasable plug connection according to claim 1 , wherein the contact point is formed by a circumferential edge of said hollow cylinder, followed by an inclined surface of said hollow cylinder.

3. The releasable plug connection according to claim 1 , wherein the plug includes a nozzle tube, and the lug stands out from the nozzle tube at the acute angle and yields under spring load in radial direction.

4. The releasable plug connection according to claim 3 , wherein an end of the lug has an end surface which, in the relaxed spring state of the lug, extends parallel to the locking surface.

5. The releasable plug connection according to claim 3 , wherein the lug has a web which stands out radially from the nozzle tube.

6. The releasable plug connection according to claim 3 , wherein the jack consists of a hollow cylinder and a sleeve which slides on the hollow cylinder against a stop, wherein the stop defines the greatest longitudinal expansion of the jack, and wherein the sleeve has an inwardly directed flange, the side of which facing the hollow cylinder defines the locking surface.

7. The releasable plug connection according to claim 6 , wherein the hollow cylinder has an inner wall which is frustoconical at one end.

8. The releasable plug connection according to claim 7 , wherein the sleeve has a spring stop protruding into the hollow cylinder for the spring acting in the axial direction, and wherein the distance between the spring stop and locking surface is smaller than the length of the lug.

9. The releasable plug connection according to claim 8 , wherein extensions originate from the flange in the axial direction and the spring stop is formed by the faces of these extensions, two of which form a guide for the lug.

10. The releasable plug connection according to claim 6 , wherein the hollow cylinder has a base by which the spring, co-axially arranged relative to the nozzle tube, is supported.

11. The releasable plug connection according to claim 10 , wherein the base of the hollow cylinder has a central opening through which the nozzle tube protrudes.