Theft preventing device for boat, has switch parts secured to portions of traction unit, another traction unit interconnecting portions of former traction unit, and alarm system releasable while disconnecting switch parts from each other

摘要

The device has a magnet switch (9) comprising two connected magnet switch parts (10a, 10b), which are separable from each other, where the magnet switch triggers a switching signal in a separated state. The magnet switch parts are secured to portions (8a, 8b) of a traction unit (8) e.g. chain. Another traction unit (13) interconnects the portions of the former traction unit. An alarm system (11) is releasable while disconnecting the magnet switch parts from each other. One of the magnet switch parts is designed as a collet, and a permanent magnet is arranged in the collet.