Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63B
APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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21/00
Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
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A63B21/15
Arrangements for force transmissions
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A63B21/151
Using flexible elements for reciprocating movements, e.g. ropes or chains
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A63B21/154
using special pulley-assemblies
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A63B21/155
Cam-shaped pulleys or other non-uniform pulleys, e.g. conical
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