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US 8,011,473 B1Granted
Motorized stepladder
OwnerCharles Gregerseninventor
Life of this patent
Estimating the term…
Abstract
A stepladder comprises a front frame and a rear frame each formed of a pair of spaced side rails. A motor-driven step is slidably mounted on the front frame side rails. The motor is controlled with a remote unit allowing a worker to automatically raise and lower the step when accessing an elevated area.
Claims5
A stepladder comprising:
- a frame member formed of a front frame and a rear frame, said front frame having a first side rail and a second side rail, said first side rail and said second side rail each including a top end, an intermediate portion and a lower end;
- a step mounted on said front frame;
- a first drive screw received within said first side rail, said first drive screw having a first drive gear attached thereto;
- a second drive screw received within said second side rail, said second drive screw having a second drive gear attached thereto;
- a drive nut attached to each of two opposing sides of said step, each nut receiving either of said first drive screw and said second drive screw;
- a reversible motor attached to said frame member;
- a first sprocket and a second sprocket operably connected to said motor;
- a first chain encompassing said first sprocket and said first drive gear;
- a second chain encompassing said second sprocket and said second drive gear whereby operation of the motor results in simultaneous rotation of the first drive screw and the second drive screw to move the step along said front frame.
6 more elements
Dependencies are inferred from the claim text.