Suspension device with a compensatory spring system
First Claim
1. A suspension device for suspendingly supporting loads under a generally constant spring-biasing support force comprising two relatively movable portions, a first of said portions being adapted to be secured to a support and a second of said portions being adapted to be secured to a load to be suspendingly supported thereby, main biasing means for biasingly mounting said first and second portions relative to each other, compensatory spring means for compensating for variations in tension and/or compression forces of said main biasing means, said compensatory spring means including at least one spring mounted between said first and second portions, a lever, means for mounting said lever for pivoting movement relative to and between said one spring and said second portion, and cooperatively engagable cam and cam follower means carried by said lever and said second portion for compensating the tension and/or compression forces of said main biasing means dependent upon the load secured to the second portion and, thus, the relative position of the cam follower means upon the cam means.
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Accused Products
Abstract
A suspension device for suspendingly supporting loads under a generally constant spring-biasing support force defined by two relatively movable portions, a first of the portions being secured to a support and a second of the portions being secured to a load to be suspendingly supported thereby, a main spring for biasingly mounting the first and second portions relative to each other, the second portion being an elongated member having an upper end portion, at least one compensatory spring adjacent the upper end portion of the elongated member, a pivoted lever between the one spring and the elongated member upper end portion, and a cam and cam follower carried by the lever and its elongated member upper end portion which compensates the tension and/or compression forces of the main spring as the cam and cam follower operate relative to each other.
27 Citations
20 Claims
- 1. A suspension device for suspendingly supporting loads under a generally constant spring-biasing support force comprising two relatively movable portions, a first of said portions being adapted to be secured to a support and a second of said portions being adapted to be secured to a load to be suspendingly supported thereby, main biasing means for biasingly mounting said first and second portions relative to each other, compensatory spring means for compensating for variations in tension and/or compression forces of said main biasing means, said compensatory spring means including at least one spring mounted between said first and second portions, a lever, means for mounting said lever for pivoting movement relative to and between said one spring and said second portion, and cooperatively engagable cam and cam follower means carried by said lever and said second portion for compensating the tension and/or compression forces of said main biasing means dependent upon the load secured to the second portion and, thus, the relative position of the cam follower means upon the cam means.
Specification