Abstract
There is no report regarding the specific design method for Spring Balancer. I investigated the basic issue of design in one of the balance systems. Using balance equation and principle of conservation of energy, the decrease of potential energy in a weight is conserved as elastic strain energy in spring, I discovered that the pulley for spring is of special spiral shape. Also I realized that the volume of spring is directly proportional to the maximum potential energy and the maximum potential energy function can be used as the design formula. This makes the Spring Balancer design easier. Also I calculated the generalized formula of inertia force for both Gravity Balancer and Spring Balancer. The result shows that Spring Balancer is suitable for miniaturization and weight reduction, because of the fact that the inertia force is smaller when the travel distance of weight is shorter.
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