biodex FREESTEP SAS Instructions For Use And Assembly page 11

NOTE: In theory, the FreeStep pulley system creates a 3:1 advantage of leverage meaning that
the patient's weight will only feel one third as heavy as it actually is. However, in practice, the
friction between the rope and the pulleys will add about 10% of the weight back to the required
force necessary for hoisting.
Figure 1.7. Tug the Rope to Disengage the Rope from the Cam Cleat.
Figure 1.8. Pulley Physics.
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