Detection of operation failure on a screw-jack by breaking of a wired shear-pin

摘要

The jack includes a screw (30) on one part, and two nuts (10,20) engaged about the screw on the other part, with relative movement between the nut and the screw producing this actuation. There is a pin (40) linked by an electrical connection (50), a force transmitting element placed on the course of force between the screw and the movable organ via the nut, and also that the mechanical extension of this force transmission element extends right up to the neighborhood of other nuts. The pin traverses along the mechanical extension and also that the element connected to the other nut, is of the sort which is abnormally offset to the force transmission element w.r.t the screw translated by the shearing between the mechanical extension and the element connected to the other nut provokes the rupture of the pin and the cutting of the electrical connection.