Device for interlocking the manual actuation of a switch with the help of locks

Abstract

An interlock device using locks to prevent manual actuation of a switch having a handle inlet, and to allow the switch to be actuated manually in a certain sequence of operations determined by using keys for the locks, thereby enabling the switch to pass from a first switching position to a second switching position, the device comprising a first lock and a second lock each operable by means of at least one key capable of being withdrawn from the corresponding lock or of being engaged in said lock only when the lock is in its locked position, a set of cams whose rotation is tied to actuation of the switch and which act on the bolts of said locks to prevent the first lock from being operated so long as the second switch is not in its second switching position and to prevent the second lock being operated by its key as soon as the second switch no longer occupies its first switching position, both locks being disposed in such a manner that their respective bolts, when in the advanced position, close the handle inlet of the switch, the bolt of the first lock being in its retracted position and the bolt of the second lock being in its advanced position when the switch is in its first switching position.