Stride adjustment mechanism
In an elliptical step exercise apparatus a dynamic link mechanism can be used to vary the stride length of the machine. A control system can also be used to vary stride length as a function of various exercise and operating parameters such as speed and direction as well as varying stride length as a part of a preprogrammed exercise routine such as a hill or interval training program. In addition the control system can use measurements of stride length to optimize operation of the apparatus.
1. An exercise apparatus comprising:
a frame;
a microprocessor for controlling the apparatus;
a pivot axle supported by said frame;
a pedal lever; including a first, a central and a second portion;
a pedal, secured to said central portion of said pedal lever;
a reciprocating guide mechanism operatively connected to said microprocessor and coupled to said first portion of said pedal lever effective to guide said first portion of said pedal lever in a generally horizontal reciprocating motion;
a crank rotationally connected to said pivot axle at a first end of said crank and adapted to support said second portion of said pedal lever at second end of said crank;
a link crank secured to said crank and pivotally secured to said second portion of said pedal lever; and
a resilient member secured between said link crank and said pedal lever.
2. The apparatus of claim 1 wherein said resilient member is a spring.
3. The apparatus of claim 1 wherein said resilient member is made from an elastomeric material.