Apparatus for applying a constant tensile force to a moving element
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United States of America Patent
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Oct 25, 1988
Issued Date -
N/A
app pub date -
Dec 9, 1985
filing date -
Sep 7, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A novel spring and dual pulley construction wherein the pulley includes a pair of co-axial grooves, one of the grooves having a constant diameter that accepts a powered cable acting in one direction, while the other groove has a varying radius of curvature that accepts a second cable connected to one end of the tension spring and with the other end of the spring fixedly mounted. This arrangement maintains a constant spring force on a member moving along a slide in a reciprocating fashion and having one side thereof connected to said powered cable for movement in one direction and the other side connected to the second cable for movement in the opposite direction activated by a constant spring force regardless of the extension of the spring.
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