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Class Information
Number: 5/56
Name: Beds > Sofa bed > Bed element > Assisting spring
Description: Devices comprising springs employed in sofa beds to counterbalance the weight of moving parts and assist in opening and closing movements.

Patents under this class:

Patent Number Title Of Patent Date Issued
5257424 Foldable bed Nov. 2, 1993
4999865 Foldable bed assembly Mar. 19, 1991
4619005 Waterbed, sofa and table Oct. 28, 1986
4592102 Mechanism for a sofa sleeper Jun. 3, 1986

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