Stage curtain motorized rigging limit switch

A limit switch apparatus for stopping a motor on a stage curtains rigging system having a chain, comprising:

• a housing, said housing having a hollow interior, and said housing attached adjacent to said chain;
• a sprocket assembly, said sprocket assembly comprised of a swingarm, a sprocket axle, and a sprocket, wherein said swingarm is rotatable about said sprocket axle and said sprocket is rotatably attached to said swingarm;
• wherein said sprocket axle is attached in said housing interior such that said sprocket can rotate inwardly and outwardly from said housing;
• a spring base attached inside said housing;
• a spring positioned between said spring base and said swingarm so as to push said swingarm outwardly from said housing to a first position such that said sprocket will engage said chain;
• a switch, wherein when said switch is activated it causes said motor to deactivate and when said switch is deactivated it allows said motor to be activated;
• wherein when said swingarm is in said first position, said switch is deactivated;
• wherein said switch is attached in said housing interior near said swingarm such that if said swingarm is rotated inwardly to a second position, said swingarm will activate said switch causing said motor to deactivate;
• wherein said switch is in operative communication with said motor;
• an insert attached to said chain;
• and
• wherein when said sprocket contacts said insert, said sprocket is urged away from said chain to said second position.

A limit switch apparatus for stopping a motor on a stage curtains rigging system having a chain with a multiplicity of chain link spaces, comprising:

• a rolling sprocket mounted on an offset pivot point mounted in a housing;
• an insert mounted into at least one of said multiplicity of chain link spaces of said chain;
• wherein said rolling sprocket engages said chain with a tooth of said rolling sprocket inserting into a chain link space;
• wherein said rolling sprocket rotates along said chain as said chain moves;
• wherein said insert positioned such that when said chain reaches a desired terminal position, said insert is positioned where said tooth contacts said insert, and said insert blocks said tooth from inserting into said one of said multiplicity of chain link spaces of said chain;
• wherein said insert pushes said sprocket away from said chain and moves said sprocket inwardly into said housing;
• wherein said inward movement of said sprocket causes a limit switch attached in said housing and in operative communication with said motor to become activated;
• and
• wherein said activation of said limit switch causes said motor to stop moving said chain.