Coupling device

1. Coupling device for conduits conveying hydrocarbon liquids and hydrocarbon vapors, comprising:

a coupling body with a connecting piece receiving section, and

a locking member for locking a connecting piece guided into the connecting piece receiving section;

wherein the connecting piece receiving section has an installation recess open radially toward a side thereof, and

wherein the locking member is adapted to be guided laterally in a radial direction into the connecting piece receiving section via the installation recess,

wherein the locking member has at least one latch lug and the connecting piece receiving section has at least one installation latch recess, wherein the latch lug is adapted to be latched into place in the installation latch recess, in order to lock the locking member into place in an installation end position, wherein the latch lug is arranged externally relative to an installation direction of the locking member, and wherein the latch lug is adapted to be elastically displaced in a direction transverse to the installation direction of the locking member,

wherein the connecting piece receiving section has, in addition, an intermediate latch recess in which the latch lug is adapted to be latched into place, in order to latch the locking member into place in an intermediate position, wherein, in the intermediate position, the locking member is positioned such that it cannot engage the connecting piece for locking and such that a locking into place of the connecting piece guided into the connecting piece receiving section is prevented,

wherein the locking member has a sealing ring holding geometry, wherein the sealing ring holding geometry is configured to prevent, in the intermediate position of the locking member, a displacing of a sealing ring arranged in the connecting piece receiving section.

2. Coupling device according to claim 1 , wherein the connecting piece has a locking projection and the locking member has at least one elastically displaceable locking latch radially directed inward, which is adapted to be engaged with the locking projection of the connecting piece guided into the connecting piece receiving section.

3. Coupling device according to claim 1 , wherein the locking member is formed substantially ring-shaped, and wherein the connecting piece guided into the connecting piece receiving section is adapted to be unreleaseably locked into place in the connecting piece receiving section via the locking member.

4. Coupling device according to claim 3 , wherein a plurality of elastically displaceable locking latches radially directed inward are formed along a ring-shaped inner circumference of the locking member.

5. Coupling device according to claim 1 , wherein the locking member is formed substantially U-shaped, and wherein the connecting piece guided into the connecting piece receiving section is adapted to be releaseably locked into place in the connecting piece receiving section via the locking member.

6. Coupling device according to claim 5 , wherein a plurality of elastically displaceable locking latches radially directed inward are formed along an inner circumference of a section of the locking member, which is curved in the shape of a semicircle.

7. Coupling device according to claim 5 , wherein the connecting piece receiving section has an unlocking recess, which enables the locking member installed in the connecting piece receiving section to be levered out by a tool.

8. Coupling device according to claim 1 , wherein said coupling device is adapted to be used with at least one of the following:

crankcase ventilation conduits,

fuel conduits and

tank ventilation conduits.