Patent ID: 9464449
Filing Date: 2016-10-11
CPC Classification: B66B,E04G,E06C

Claim Text:
1. An electric ladder comprising: a ladder frame having a left tube and a right tube, said left and right tubes having upper and lower portions, said left and right tubes having a slot runs between the upper and lower portions, said upper portions of the left and right tubes coupled by a top bar and said lower portions of the left and right tubes coupled by a base; said ladder frame further comprising a support assembly, said support assembly pivotally connected at the top portions of the left and right tubes, said support assembly being U-shaped having parallel first and second legs linked by a horizontal support; said base comprising, a removable base cover, a left support plate and a right support plate, said left and right support plates bonded to respective ends of the base plate, a battery, a DC motor, front and back spool supports mounted by a respective support nut and electronic control box, a left pulley mount is coupled to the left support plate and right pulley mount is couple to the right support plate, a right pulley coupled to a right pulley mount, a left pulley coupled to a left pulley mount by a lower pulley retainer, a left cable guided by the left pulley and a right cable guided by the right pulley, the right and left cable are spooled onto a spool subassembly, the spool assembly comprises front and rear spools, a worm and worm gear, square drive shaft; a platform assembly for carrying an operator, said platform assembly comprising a platform, a break unit, right and left roller guides mounted to a bottom side of the platform, a gate, latch pin, and a U-shaped security tube; a right middle subassembly, comprising a right mounting plate, having upper and lower wheels coupled to an outer surface of the right mounting plate, an adjuster plate coupled to an inner surface of the right mounting plate, a tang welded to an outer surface of the right mounting plate, wherein the tang is inserted into the slot of the right tube; and wherein said right cable is fed through the tang allowing the platform to move up and down along the tubes; a left middle subassembly, said left middle subassembly comprising a left mounting plate, having upper and lower wheels coupled to an outer surface of the left mounting plate, an adjuster plate coupled to an inner surface of the left mounting plate, a slide roller consisting of a plurality of roller pins positioned on an inner surface of the adjuster plate, said upper and lower wheels of said right and left middle subassemblies ride along the right and left tubes, said slide roller of the right middle and left middle subassemblies are held together and move as one unit when the platform assembly is positioned between the right and left middle subassemblies; and a brake unit, comprising a brake pedal, brake nut, brake pad, elastomeric pad.