Mechanical projector with variable leverage arrangement

Claim 1

A mechanical projector with a variable leverage arrangement comprising: a central holder member; a pair of primary swing arms mounted on said central holder member to be swingable on either side of said holder member; spring means acting on each of said primary swing arms at an intermediate point along the length thereof resisting swinging on said holder member from an initial position, and acting on said primary swing arms when released to restore said primary swing arms to said initial position; a pair of secondary swing arms, each pivoted at one end to the distal end of a respective primary swing arm; constraining means acting on each of said secondary swing arms constraining the pivotal movement of each of said secondary swing arms to correspond to swinging movement of a respective primary swing arm, as each of said primary swing arms swing away from said initial position of said primary swing arm, from an initial pivotal position of each of said secondary swing arms to an advanced position swung away from said distal end of said respective primary swing arm; a drawstring connected at either end to the distal end of each secondary swing arm, whereby drawing of said drawstring acts through each of said secondary swing arms to cause pivoting of each of said primary swing arms away from said initial positions thereof against the resistance of said spring means, with increasing leverage exerted thereby as said distal ends of said secondary swing arms pivot away from said distal ends of said primary swing arms.