FIELD: ladders.
SUBSTANCE: group of inventions relates to force-balancing mechanisms for weighted members and/or loads. According to one embodiment, the force-balancing mechanism includes at least one gear rack, at least one spring assembly comprising a spring member operatively connected to the at least one gear rack, a pinion gear intermeshed with the at least one gear rack; and a variable radius cam. Rotation of the cam causes the pinion gear to rotate to thereby in turn linearly drive the at least one gear rack and accumulate spring force of the spring member. Spring member may be a compression or a tension spring.
EFFECT: technical result of the group of inventions is strength and compactness of the force-balancing mechanism for loads.
26 cl, 10 dwg
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