Gravity balancing device for rocking arm
First Claim
1. A gravity balancing device for offsetting a gravitational moment of a rocking arm, mounted between a fixed point located above a pivotal point of said rocking arm at a predetermined distance a and substantially in vertical alignment therewith, and an arbitrary point on said arm, said gravity balancing device comprising:
- compression spring means having a spring constant k of a value equivalent to a load W at said arbitrary point as divided by said predetermined distance a, and a free length equal to a sum of the length l between said fixed and said arbitrary point and an initial mounted length ls of said compression spring for applying a counterbalancing tensile force varying in proportion to the distance between said fixed point and said arbitrary point on said arm.
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Accused Products
Abstract
A gravity offsetting device for offsetting the gravitational moment of a rocking arm, mounted between a fixed point located above a pivotal point of the rocking arm at a predetermined distance a and substantially in vertical alignment therewith, and an arbitrary point on the rocking arm, the gravity balancing device including: a compression spring having a spring constant k of a value corresponding to the load W at the arbitrary point as divided by the distance a, and a free length corresponding to the sum of the length l between the fixed and arbitrary points and the initial set length ls of the compression spring, and adapted to apply a counterbalancing tensile force varying in proportion to the distance between the fixed and arbitrary points.
63 Citations
5 Claims
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1. A gravity balancing device for offsetting a gravitational moment of a rocking arm, mounted between a fixed point located above a pivotal point of said rocking arm at a predetermined distance a and substantially in vertical alignment therewith, and an arbitrary point on said arm, said gravity balancing device comprising:
compression spring means having a spring constant k of a value equivalent to a load W at said arbitrary point as divided by said predetermined distance a, and a free length equal to a sum of the length l between said fixed and said arbitrary point and an initial mounted length ls of said compression spring for applying a counterbalancing tensile force varying in proportion to the distance between said fixed point and said arbitrary point on said arm. - View Dependent Claims (2)
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3. An industrial robot incorporating a spring unit for counterbalancing gravitational moment of a rocking arm between a fixed point located above a pivotal point of said rocking arm at a predetermined distance a and substantially in vertical alignment therewith, and an arbitrary point on said arm, said gravity balancing device comprising:
compression spring means having a spring constant k of a value equivalent to the load W at said arbitrary point and divided by said predetermined distance a, and a free length equal to a sum of the length l between said fixed point and said arbitrary point on said arm and an initial mounted length ls of said compression spring, for applying a counterbalancing tensile force varying in proportion to the distance of said fixed point and said arbitrary point on said arm. - View Dependent Claims (4, 5)
Specification