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US 5,180,136 AGranted
Counterbalance mechanism
AssigneeWeber Knapp Company
InventorAlan Sova
Life of this patent
Estimating the term…
Abstract
A counterbalance mechanism including a pair of interconnected parallelogram linkages provided with counterbalance springs, and an adjustment for simultaneously controlling the counterbalance effect of the springs.
Claims8
A counterbalance mechanism comprising:
- a pair of parallelogram linkages having interconnected adjacent ends and distal ends;
- a pair of counterbalance spring means having adjacent ends and distal ends connected one to each of said distal ends of said linkages;
- adjustment means carried by said interconnected adjacent ends for simultaneously controlling the positions of said adjacent ends of said spring means for adjusting the counterbalance effects of said spring means on said linkages.
A counterbalance mechanism comprising:
- a pair of parallelogram linkages having adjacent ends defined by a common connecting link, opposite end links and side links opposite end connected to said common connecting link and opposite end links by pivot pins;
- a pair of counterbalance spring means associated one with each of said linkages, each of said spring means having first ends connected to said linkages adjacent said opposite end links and second ends arranged adjacent to said common connecting link;
- and
- adjustment means for simultaneously moving said second ends of said spring means relative to said pivot pins connecting said side links to said common connecting link for adjusting the counterbalance effect of said spring means on said linkages.
1 more element
Dependencies are inferred from the claim text.