Building drum with locking device

Building drum for building an unvulcanized tire or air spring using rubber components, comprising:

• a central shaft with a circumferential wall having an outer diameter,
• a casing with a circumferential surface for arranging the components thereon, wherein the casing comprises a substantially continuous opening having an inner diameter that corresponds with the outer diameter of the circumferential wall of the central shaft, wherein the casing is detachably attached to the central shaft, and wherein the casing is provided with a movable coupling pin that can be placed in a coupled position in which the coupling pin extends in an opening in the circumferential wall of the central shaft, and in an uncoupled position in which the coupling pin is placed outside of the circumferential wall of the central shaft, characterized in that the casing further comprises a locking device with a locking pin, wherein the locking pin is adapted for in the coupled position of the coupling pin engaging thereon in order to substantially block a movement of the coupling pin, wherein the casing comprises a connecting device for connecting an electric, pneumatic or hydraulic line to the casing, and wherein the locking device comprises a locking member, wherein the locking member in a condition in which the locking pin does not engage onto the coupling pin, is placed such with respect to the connecting device that the locking member substantially prevents a connection of the line to the connecting device.