| 摘要 |
A blocking arrangement serves for secure prevention of a spear (1) being unscrewed from a corresponding neck ring (3) in a container for a liquid, for example beer, being under pressure by a drive gas in the container. The blocking arrangement consists of a split spring ring (8) which is placed in a groove (5) constructed in the corresponding neck ring (3). This groove is so deep that the spring ring is allowed to be squeezed radially into the groove. The expansion of the spring ring radially outwards is limited, however, by an inwards turning cylinder face (22) on the spear (1). Furthermore, the spear has an upwards turning blocking face (12) which adjoins the cylinder face (22). When dismounting of the spear is attempted, its blocking face (12) adjoins the spring ring (8) which is retained axially by the downwards turning upper side (16) of the groove. To prevent the axial forces, by which the spring ring (8) is acted on, from working the spring ring free of the blocking face (12), the spring (8) has a larger thickness at the outside diameter than at the inside diameter. Thereby the blocking arrangement provides the optimal security against an unauthorized person being injured by being hit by a spear dismounted and shot out into the room by an overpressure in the container.
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