Safety Measures
Procedure 1: Range of Motion (ROM) Bolts
There are two adjustable bolts on the hydraulic actuator. These are placed at
the plantarflexion and dorsiflexion limits of the test subject. The bolts
act as mechanical stops to avoid rotating the ankle beyond the subject's
range of motion.
Procedure 2: Hydraulic Flow Bypass
The actuator is equipped with a hydraulic flow bypass mechanism which acts as a second measure of safety. The mechanism consists of a cam, which activates a bypass valve when the elevated portion of the cam comes in contact with the plunger. The two adjustable plates are rotated relative to each other until they are just shy of the ROM bolts. Note that the screw on the plunger should be left relatively loose, to allow the plunger to easily move up and down.
 
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