Abstract: In a returning system for service carts (24), said system comprising electronic monitoring of the movement of the carts (24) through an activity area, the main novel features are a) that the returning system is an electronic system operable in a deposit-free manner, the elements of said system being mutually related in a compulsorily activating manner from a collection station, at which the carts stand in readiness to be collected, and via an activity area again back to a readiness collection station, b) that the system comprises an electronic signal director (20) that is both controllable and/or controlling and comprises fixed and variable functions, c) that the system further comprises, c1) mobile electronic communication devices (28) intended and constructed for placement on the system's service carts (24) so as to accompany the latter, each of said communication devices (28) being adapted for electronic identification of the particular service cart on which it is placed, and c2) stationary electronic

Abstract: A coin-deposit lock to be placed on a trolley being part of a row of mutually connected e.g. shopping trolleys or baggage trolleys comprises a main slide being longitudinally slidable against the force from a spring and a measuring slide likewise longitudinally slidable against the force from a second spring. Each of the slides has a transverse central aperture, and when a coin of a certain value (diameter) has been inserted between the slides, the apertures are mutually aligned. Upon insertion of a key belonging to the lock in a first key opening in the lock, the slides can be moved to a position in which a latching finger on a pivotable release member engages in the mutually aligned apertures and retains the slides and the coin between them in a withdrawn position. At the same time, the release member pivots to a position, in which a second latching finger on it frees a second key associated with a previous trolley in the row thus freeing the trolley from the row.

Abstract: A lock operated by the introduction of a coin into a chamber in the lock. A scanning member scans the size of the introduced coin. The scanning member includes at least one recess for receipt of a releasing member adapted to move into said recess to cause release of a locking member to permit removal thereof from the lock.

Abstract: A coin-operated lock for mounting on a trolley which is alternatively secured and released. The lock has two keyholes for two separate keys having interacting blocking means formed by codification units so that only keys having interacting, fitted codes can be mutually displaced when cooperating with their respective keyholes.

Abstract: A coin-operated lock for mounting on a trolley which is alternatively secured and released. The lock has two blockable keyholes for two separate keys, and a common fence which cooperates with the keyholes is adapted to move from a blocking position in one of the keyholes to a blocking position in the other keyhole upon insertion of a key into the latter keyhole, for securing one of the keys inserted into the corresponding keyhole.