Locking device for a telescopic cylinder

A locking device for the telescopic cylinder of a telescopic boom comprising a plurality of telescopic stages, comprising:

• a housing,
• at least one bolt displaceably mounted in the housing for locking the telescopic cylinder with a telescopic stage, wherein the bolt is preloaded into a locking position via at least one bolt return element and can be displaced into an unlocking position via at least one bolt actuator,
• a yoke displaceably mounted in the housing, which can be moved into an unlocking position to release a locking bolt of the telescopic boom,
• at least one blocking element which blocks a movement of the bolt into its unlocking position when the yoke is in the unlocking position, wherein the blocking element and the bolt are at least partially displaceable into a common insertion space of the housing,
• wherein
• the bolt is preloaded into the locking position via at least two bolt return elements, wherein the blocking element is arranged between the bolt return elements as seen in the direction of displacement of the yoke.