초록 ▼

The present invention relates to a braking device for use with a vehicle which moves along a surface, the braking device being operated by an area of magnetic material, and is particularly, but not exclusively, for use with a wheeled trolley or cart to deter its removal from a designated area. The b

The present invention relates to a braking device for use with a vehicle which moves along a surface, the braking device being operated by an area of magnetic material, and is particularly, but not exclusively, for use with a wheeled trolley or cart to deter its removal from a designated area. The braking device comprises a first portion for mounting on the vehicle, a braking portion movable relative to the first portion from an inoperative position to an operative braking position in braking contact with the surface, and retaining portion for retaining the braking portion in its inoperative position. The retaining portion comprises a blocking portion and trigger portion, the trigger portion being movable between a primed position and a triggered position by passage in close proximity to the magnetic material, and in the primed position, holding the blocking portion in a blocking position preventing movement of the braking portion. In moving to its triggered position, the trigger portion releases the blocking portion to allow it to move to its unblocking position to allow movement of the braking portion to its braking position on passage of the device past the magnetic material. To prevent inadvertent release of the braking portions, the braking portion cooperates with the blocking portion to prevent movement of the blocking portion from its blocking position to its unblocking position in the absence of the magnetic material, cooperation being released by application of a force to the braking portion or the blocking portion.

대표청구항 ▼

[ What is claimed is:] [1.] A braking device for mounting on a vehicle which is movable along a surface, said braking device comprising a first portion for mounting on the vehicle, a braking portion movable relative to the first portion from an inoperative position to an operative braking position i

[ What is claimed is:] [1.] A braking device for mounting on a vehicle which is movable along a surface, said braking device comprising a first portion for mounting on the vehicle, a braking portion movable relative to the first portion from an inoperative position to an operative braking position in braking contact with the surface, and retaining means for retaining the braking portion in its inoperative position, a portion of the retaining means rebutting a surface of the braking portion to prevent movement of the braking portion, the retaining means being operable in response to the passage of the device in close proximity to external means to release the braking portion, wherein the braking portion and retaining means cooperate to prevent operation of the retaining means to release the braking portion in the absence of the external means, and including means for applying a force to one of the braking portion and the retaining means to remove said cooperation on passage of the device in close proximity to the external means.