Abstract

The design of spring counterbalances for commercial purposes customarily has involved a sacrifice in accuracy for the sake of simplicity and economy. Overhead garage doors, automobile trunks, pipe hangers, and many other such products are ordinarily provided with a simple form of spring loading which produces true equilibrium at some central position but 10 to 15 per cent over or under-balancing at the extreme positions. This paper shows that this compromise with real accuracy is unnecessary and describes a method for attaining perfect full-rotation counterbalancing by the proper connection of a standard helical spring.

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