Electric shopping trolley also capable of negotiating stairs includes a user seat and collision prevention sensors, lights and four reserve triangular wheels

摘要

The electric shopping trolley also capable of negotiating stairs has four triangular wheels (12) with electric motors and controllers (2B,3B) also actuating the conventional wheels. The motors (1) have toothed transmission belts (5), and threaded shafts (7) varying the distances between the wheels.