1. In an apparatus for controlling operation of an electric hoist circuit dependent on the load supported on the hoist exceeding a predetermined weight; a. a housing adapted to be secured to a fixed support, said housing including a rear wall, b. a wall secured to and extending angularly from the rear wall, intermediate the ends of the rear wall, and having an aperture therethrough, c. a switch for the electric hoist circuit, said switch being mounted in spaced relation to the top of the angularly extending wall and in axial alignment with the aperture therethrough, and having a switch contact surface controlling operation of said switch and thereby controlling the electric hoist circuit, d. elongated switch control means for movably contacting the switch contact surface at one end and for connection with the load at the other end, said means being movably positioned in the aperture in the angularly extending wall and reciprocable therein, e. means for resiliently sensing and responding to the load weight, said means having opposite ends, one of said ends being positioned atop the angularly-extending wall, f. said resiliently sensing and responding means being movable upon application of weight load thereto, g. retaining means adjustable movable along said elongated means and into engagement with the resiliently sensing and responding means for urging the latter onto the top of said angularly extending wall, to the degree so predetermined by the position of the retaining means on the elongated switch control means, to thereby adjustably predetermine the compression of the resilient means to the degree required by the load so connected to said elongated switch control means, and h. lower retainer means engaging the elongated switch control means and urged into engagement with the bottom of the angularly extending wall by the action of the resiliently sensing means on said elongated switch control means.