Remote safety release for safety switches and safety switch comprising the release

A safety switch for controlling access, comprising:

• a switching device (2) having a casing (4) housing switching means of one or more circuits and anchored to a fixed part (F) of an access (A);
• an actuator device (3) anchored to a movable part (M) of the access (A) to interact with said switching means when the access (A) is closed;
• wherein said actuator device (3) comprises a retaining element (5) adapted to interact with said switch device casing (4) when the access (A) is closed to engage a locking mechanism present in said casing (4) and adapted to prevent said retaining element (5) to be removed from said casing (4);
• wherein said switching device (2) is associated with a remote safety release (9) which comprises:
• an actuator (13) adapted to interact with said locking mechanism to cause its forced release, said actuator (13) being adapted to move between an inoperative position wherein said actuator (13) does not interact with said locking mechanism and at least an operative position wherein said actuator (13) interacts with said locking mechanism;
• a remote control device (14) adapted to be driven by an operator to remotely control said actuator (13) and move it from said inoperative position to said at least an operative position for said interaction with said locking mechanism and consequent release thereof;
• a transfer mechanism (15) adapted to transfer a force from said remote control device (14) to said actuator (13) following a remote control command given by an operator to promote the movement of said actuator (13) from said inoperative position to an operative position;
• wherein said transfer mechanism (15) is adapted to exert a first solicitation on said actuator (13) to promote passage thereof from said inoperative position to said at least an operative position, said remote control device (14) exerting on said actuator (13), when said remote control command has not been given by the operator, a second contrast solicitation opposite to said first solicitation and having at least equal value to cancel said first solicitation and hold said actuator (13) in said inoperative position, allowing passage of said actuator (13) from the inoperative position to said at least an operative position in an absence of said second solicitation for the release of the locking mechanism.