Hoop lock

A hoop lock having a lock body and a hoop,

• wherein the lock body comprises at least one introduction opening which opens into an introduction passage, wherein the lock body further comprises a locking device,
• wherein the hoop may be selectively brought into an open position or a closed position with respect to the lock body, wherein the hoop comprises at least one hoop end which, in the closed position of the hoop, protrudes through the introduction opening into the introduction passage of the lock body, wherein, in the closed position, the hoop is lockable at the lock body by the locking device,
• wherein the hoop comprises a tube formed of metal and having a cavity extending in a longitudinal direction of the tube in which a reinforcing filling is disposed, wherein the reinforcing filling comprises a granulate embedded in a binding material,
• wherein, in the closed position of the hoop, the reinforcing filling extends at least up to the height of the introduction opening of the lock body,
• wherein the at least one hoop end comprises at least one locking structure for a locking engagement with the locking device, wherein the locking structure is in the form of a recess that extends into an outer side of a wall section of the tube without forming an opening into the cavity of the tube and does not protrude into the cavity;
• wherein the wall section circumferentially encloses the cavity;
• wherein the locking device comprises at least one moveable latch, wherein the hoop, in the locked position, is lockable at the lock body in that the at least one latch is moved into a locking position in which the at least one latch is in a locking engagement with the at least one locking structure of the hoop;
• wherein the locking device comprises a key-operated lock cylinder, an electric motor, or an electromagnet that drives the at least one latch;
• wherein the at least one locking structure in the form of the recess extends along only a portion of the circumference of the tube.