A British engineer, Professor Meredith Thring, has developed a prototype invalid chair capable of climbing up and down stairs.
SV Designer showing chair
SV Designer. TILT DOWN TO Chair being tilted
CU Battery power unit (one of two)
CU Designer showing spring spokes for gripping stairs
MV & GV Designer shows manoeuvrability and capabilities of chair climbing stairs (5 shots)
Initials ESP/0200 ESP/0211
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Background: A British engineer, Professor Meredith Thring, has developed a prototype invalid chair capable of climbing up and down stairs.
It is battery-driven, and uses an aircraft reduction gear system to transfer power from two car batteries to the wheels.
The wheels, which are wide and flat, contain flat-tipped spokes which spring out beyond the rims when the chair meets a stair ... the spokes then take the weight and lift the chair up and forward.
The chair would cost about one thousand pounds sterling (2,500 US dollars) to make, but this would be reduced to GBP250 (650 US dollars) with mass production techniques.