Anti-backdrive lock

A backdrive braking element for preventing backdrive of an input shaft, the backdrive braking element comprising:

• an input gear assembly coupled to the input shaft, wherein the input gear assembly includes an input gear shaft;
• a poly-lobed locking mechanism including an unlock shaft couplable to the input shaft, wherein the poly-lobed locking mechanism is contained in a housing having an interior cavity surrounded by an interior wall,
• wherein the unlock shaft has a polygon shaped inside profile and is coupled to a poly lock drive and brake assembly,
• wherein the poly lock drive and brake assembly includes a plurality of poly lock drive and brake segments and is contained within the interior cavity of the housing, and wherein the poly lock drive and brake segments are configured so that a torsional load applied to the unlock shaft causes a load acting to compress the poly lock drive and brake segments to engage the input gear shaft, and a torsional load applied to the input gear shaft causes a load acting to expand the poly lock drive and brake segments toward engagement with the interior wall of the housing.