Abstract: This invention relates to a device for use in elevators for the unlocking and locking of closed doors, gates, bars or wickets. The device comprises a mechanical locking means arranged at the door, gate, bar or wicket and includes a locking bolt moved to locking position by a spring. The locking bolt is movable against the action of the spring to a non-locking position by means of an electromagnet which is arranged to be activated, by a lock actuator device carried by the elevator cage, when the cage is at a holding floor at which it is to be stopped. The locking means further includes an electrically conductive element, preferably in form of a contact washer around the locking bolt or a prolongation of the bolt, which element follows the motion of the locking bolt and operates to close an electric circuit when the bolt is in locking position.

Abstract: An electromagnet comprises a coil core of ferro-magnetic material having a coil wound around the core. The coil is supported by a bobbin. The coil core is elongated, and the winding of the coil surrounds the core in its longitudinal direction, so that a homogeneous magnetic field extending between the longitudinally running end surfaces of the coil core is obtained along the length of the whole coil core. A touch free influence of magnetic field controlled means, such as reed switches, positioned along the length of the coil at one of its long sides provided with a winding being obtained, so that for influencing, said means can take a position relative to the magnet within a considerable margin determined by the length of the long sides of the magnet.