An industrial locking switch comprises multiple locking tongue entry slots formed on adjacent sides of the locking switch housing, thereby supporting receipt of the corresponding locking tongue from multiple directions of approach without the need to mechanically modify the switch's head or to reorient the switch itself. The locking switch houses locking bolt detection circuity comprising multiple series connected RFID coils configured to detect an RFID tag mounted on the locking tongue when the locking tongue is inserted into any of the entry slots.

A safety switch with differentiated CPUs comprises a switching device (2) associated with a fixed part of an access to be controlled and having switching means connected to one or more circuits of the system for the opening/closing thereof, a driving device (3) associated to a movable part of the access to interact with the switching means for opening/closing of one or more circuits, control means (6) associated with the switching device (2) and adapted to receive input signals from the circuits through respective communication buses for sending an error signal and/or for stopping the system in case of no signal or detection of non-compliance, wherein the control means (6) comprise a main CPU (7) connected with the communication buses (9) associated with safety functions and at least one auxiliary CPU (8) connected solely to the communication buses (12) associated with circuits and/or devices not related to safety conditions.

The invention relates to a safety switch assembly (100) having a switch installation (120) having at least one switching member (12) and at least one actuation installation (110) having at least one assigned actuator (13, 13′, 13″, 14), wherein a transmission installation (130) having at least one transmission member (135) which is coupleable or coupled to the switching member (12, 12a), on the one hand, and to the at least one actuator (13, 13′, 13″, 14), on the other hand is provided between the actuation installation (110) and the switch installation (120). In order to have available a safety switch assembly (100) in which a mechanical fault does not lead to a failure of that functionality that optionally permits the integration of a diagnostic function in order for the system in the case of a fault being detected to be able to be brought back to a safe state and that permits a transfer of mechanical as well as of electrical/electronic functions across the entire system, it is provided that the transmission installation (120) is provided with a plurality of separate transmission members (135) which in the actuation of the at least one actuator (13, 13′, 13″, 14) of the actuation installation (110) are drivable or driven in a synchronous and mutually independent manner, and that each of the transmission members (135) by way of a rotary movement is permitted to convert an actuation movement of the at least one actuator (13, 13′, 13″, 14) to a translatory movement of in each case one separate switching member (12, 12a) of the switch installation (120). (FIG. 4).

Embodiments provide a terminal, and the terminal includes a body, a cover body covering the body, a circuit board mounted in the body, a central processing unit welded on the circuit board, a control part mounted on the cover body, and a protection switch welded on the circuit board. A hard disk slot for accommodating a hard disk is disposed in the body. The cover body is detachably mounted on the body, and is configured to seal the hard disk in the hard disk slot. The cover body is opened to drive the control part to open the protection switch. An electrical signal variation is generated due to opening of the protection switch. After detecting the electrical signal variation, the central processing unit instructs the hard disk to perform data protection and powers off the hard disk.

An hand-operated safety switch with time delay (1) comprises a switching device (2) adapted to be anchored to a fixed part of the protection and provided with switching means (5) adapted to be connected to a plant to be controlled, an operating device (3) adapted to be anchored to a movable part of the protection for interacting with the switching means (5) upon the closing of the movable part. The switching device (2) comprises a locking mechanism (9) associated with the switching means (5) and adapted to selectively hold/release the operating device (3) and hand-operable unlocking means (10) operatively coupled with the locking mechanism (9) for unlocking the operating device (3) with a predetermined time delay with respect of the switching of the power supply circuit by the switching means (5). The switching device (2) has sensor means (13) operatively coupled with the switching means (5) for modifying their operative condition in function of an inlet signal. The operating device (3) also comprises a transmitter (14) adapted to send a proximity signal to be received as input by the sensor means (13) for controlling the switching means (5) when said transmitter (14) is place at a predetermined minimum distance from the sensor means (13). The locking mechanism (9) also comprises an inner passage (29) adapted to allow the passage of means for connecting the sensor means (13) with the switching means (5) avoiding the interference with the unlocking means (10).

A modular structure for safety switches for controlling access for machines and industrial plants comprises a casing (2) housing switching means for controlling one or more circuits of the machine or plant, drive means adapted to interact with the switching means upon the opening/closing of the access, an auxiliary module (3-3.sup.v) housing at least one control (4.sup.i-4.sup.v) adapted to be manually operated to operate on the switching means and/or the drive means and comprising a box hollow body (5) having at least one opening (6) for inserting the control (4.sup.i-4.sup.v) provided with first means for removably connecting the control (4.sup.i-4.sup.v), the latter being selected within a series of controls (4.sup.i-4.sup.v) having functions different from each other and each provided with a fastening rod (7.sup.i-7.sup.v) adapted to be inserted in the opening (6) of the box body (5) and provided with second connecting means complementary to the first connecting means.

A safety switch for controlling the access to industrial machines comprises a switching device having switching means, an actuator device (3) to interact with the switching means at the opening/closing of the access for passing from a removed condition to an inserted condition, locking/unlocking means adapted to lock the actuator device on the switching device following their mutual interaction, an electronic control unit having a first communication channel with a first inlet and a first outlet and a second communication channel with a second inlet and a second outlet, wherein said first inlet and said second outlet are of safe type and adapted to vary their state after detecting the condition of said actuator device and wherein said electronic control unit is adapted to vary the state of said first outlet and said second outlet upon detection respectively of a first and a of second condition for said actuator device.

To prevent incoincidence of contacts, a safety switch switches the contacts by cooperation of an actuator and a switch body. The switch body includes an operating cam and a locking cam that rotate due to insertion of the actuator, an operating rod that switches the contact according to rotation of the operating cam, and a locking lever that is movable toward and away from the locking cam such that the locking lever takes a lock position in which it locks rotation of the locking cam and an unlock position in which it unlocks rotation of the locking cam. The locking lever includes a bulge protruding toward the locking cam. A cam contact surface of the locking lever contacts the locking cam when the actuator moves in a drawing-out direction in an intermediate position between the lock position and the unlock position.

An escape release mechanism that serves as a supplementary means for unlocking a solenoid-driven locking switch. The escape release mechanism comprises a knobbed escape release switch that can be pressed by an operator from inside a protected industrial area to override the solenoid-driven lock. In response to a single-direction linear movement of the escape release key, a pin extends from the escape release mechanism in a direction orthogonal to the escape release key's linear movement. This forward movement causes the pin to displace the locking bolt of the locking switch. As the single-direction linear movement of the escape release key continues, the pin retracts from the locking switch out of the path of the locking tongue, allowing the tongue to be removed. In this way, the pin is both extended and retracted in response to a single-direction linear action by the operator.

A safety switch device configured to perform at least one of connecting a load to a power supply and disconnecting the load from the power supply is provided. The safety switch device comprises a first set of two serially connected controllable switching elements; a safety circuit to verify a switching state of the first set of two switching elements, wherein each switching element of the first set of two switching elements is configured as a toggle; a control circuit configured to provide a test signal to the safety circuit; and decoupling means configured to galvanically decouple the load circuit from the control circuit. The decoupling means comprise a transformer, and the control circuit comprises a transformer driver configured to provide the test signal to the safety circuit via the transformer.