Abstract: The invention relates to an apparatus (1) for monitoring the state of a protective device (2) of a machine (4), in particular a safety switch for monitoring the closed state of a protective door or the like, wherein the apparatus (1) has a switch housing (22) with a switch head (24) and an actuator (8), which in the closed state of the protective device (2) interacts with the switch head (24) and, as a result, the closed state of the protective device (2) can be signalled, and wherein the apparatus (1) has a tumbler device (20) with a tumbler element (30), which is mounted movably in the apparatus (1) and by means of which the closed state of the protective device (2) can be locked releasably, characterized in that the tumbler device (20) has at least one permanent magnet (34), by means of whose magnetic force the tumbler element (30) can be fixed in a first position when the power supply to the apparatus (1) is switched off, in which first position the tumbler device (20) locks the closed state of the protec

Abstract: The invention relates to a device (1) for monitoring the state of a protective device (2), wherein said protective device (2) comprises a first element (4) provided with an opening (5) and a second element 6) which is movable with respect to the first element (4) in such a way that the opening (5) is closable at least partially, the device (1) comprises a locking device provided with a locking element (18) by which the close state of the protective device (2) is removably lockable and is blocked in the currentless state of the locking device, said locking device is activable by the movement of the protective device (2) from the open to the close state thereof.

Abstract: A locking system is for a safety switch. The switch has a reading head (2) and an actuator (3) with first and second modules (10, 14) containing electric and/or electronic components. The components can be caused to interact electrically in a contactless manner to control the safety switch. The actuator (3) can be locked on the reading head (2) by a controllable electromagnet (7), which cooperates with a counterelement (12). The counter-element (12) and/or the electromagnet (7) is/are connected in a fixed manner to a corresponding base element (13), which is fixed to the actuator (3) or reading head (2), but can be pivoted in relation to the base element. The first and/or second module (10, 14) is/are integrated into the respective counter-element (12).

Abstract: The invention relates to a locking system for a safety switch, comprising a reading head (2) and an actuator (3), which have a respective first and second module (10, 14) containing electric and/or electronic components, which can be caused to interact electrically in a contactless manner in order to control the safety switch. Said system is characterised in that the actuator (3) can be locked on the reading head (2) by means of a controllable electromagnet (7), which co-operates with a counter-element (12), that the counter-element (12) and/or the electromagnet (7) is/are connected in a fixed manner to a corresponding base element (13), which is fixed to the actuator (3) or reading head (2), but can be pivoted in relation to said base element and that the first and/or second module (10, 14) is/are integrated into the respective counter-element (12).

Abstract: A device for switching an electric connection, especially a hinge switch includes a pin that can be actuated form outside the device. The device further includes an actuator arranged on the pin and interacting with a switch that switches the electric connection once a switching point is exceeded. The device allows the switching point to be adjusted and readjusted simply and permanently with relatively few constructive elements. The actuator is displaced in a radial and/or an axial direction in relation to the pin by an adjusting device in such a manner that the switching point can be adjusted to a given angel position of the pin.

Abstract: A safety switch includes a switch housing having at least one key channel into which a key can be introduced from the exterior. A plate cam projects into key channel and rotates when the key is introduced. A mechanism in secures the plate cam when the key has been fully introduced or completely removed.

Abstract: A safety switch for a guard device associated with a machine or a device, the safety switch has a switch housing, a switch head connected to the switch housing and having a drive device actuatable by a key insertable into and removable from the switch head, a switch actuating device which is displaceable counter to a restoring force into a position corresponding to a first switch position by an actuating force generated by the drive device and without this actuating force exerted by the restoring force assumes a position corresponding to a second switch position, a sensor detecting a presence and an absence of the switch head, and an actuator arranged in the switch housing and operating so that under a control of the sensor in the event of loosening of the switch head from the switch housing exerts a force on the switch actuating device in a direction of motion to the restoring force, that is equal to or greater than the restoring force, depending on whether the switch actuating device is to be held in a prev