1. A load limit switch comprising: a housing; an inclined plane rigidly mounted in said housing; block means positioned on and slidable relative to said inclined plane and housing, said block means including means for suspending therefrom a cable for supporting weight; resilient bias means positioned between the housing and block means for biasing said block means with a preselected force at a position on the inclined plane; and switch means activated by said block means upon translation of the block means a predetermined distance along the inclined plane against said spring bias means under the force of weight above a predetermined amount supported on a cable suspended from said block means.

5. A load limit switch for interposition between lifting machinery and a suspended cable from which weights are to be supported comprising: a housing with means for connection to said lifting machinery; an inclined plane rigidly mounted in said housing; block means positioned on and slidable relative to said inclined plane and housing, said block means including means for suspending therefrom a cable for supporting weights; spring bias means positioned between the housing and block means for biasing said block means with a preselected force at a reference position on the inclined plane; switch means actuated by said block means upon translation of said block means a predetermined distance against said spring biased means along the inclined plane under the force of weight above a predetermined amount lifted on a cable in turn suspended from said block means; and circuit means controlled by said switch for shutting off the lifting machinery.

7. A load limit switch comprising: a housing; means for suspending from said housing a cable with which weights are to be lifted; means mounted in said housing for directing a fraction of the force on the suspended cable due to lifted weights in a lateral direction within the housing; means in said housing slidable in response to said laterally directed fractional force; spring means mounted in said housing and biased to oppose with a predetermined opposing force motion of said slidable means due to said laterally directed fractional force; and switch means activated by said slidable means when said laterally directed fractional force exceeds said predetermined opposing force; said means mounted in said housing for laterAlly directing a fraction of the force on the suspended cable due to lifted weight comprising an inclined plane rigidly mounted to said housing and block means positioned on said inclined plane and slidable relative to said inclined plane and housing, said block means including means for suspending therefrom a cable with which weights are to be lifted.

9. A load limit switch comprising: a housing; first block means mounted in and rigidly connected to said housing, said block means formed with a plane top surface inclined at an angle with respect to the horizontal when said switch housing is in operating position; second block means mounted in said housing and slidable relative to the housing, said second block means positioned to rest on the first block means, said second block means formed with a plane bottom surface complementary to the top surface of the first block means and slidable relative thereto; means for connecting to said second block means a cable on which weights are to be suspended; spring biased means positioned between said housing and second block means and formed to bias with a predetermined force the second block means in a predetermined reference position relative to the housing and first block means; and switch means connected to said housing and activated by said second block means upon translation thereof from said predetermined reference position a preselected distance along the inclined top surface of the first block means under the force of weight above a predetermined amount suspended from a cable connected to said second block means.