FIELD: furniture.
SUBSTANCE: invention relates to arcuate spring members used in sofa beds. Unidirectional rigidifier is made of a flexible tension member. Flexible tension member has an arcuate elongated shape, said tensile member further has a lateral slit, said lateral slot closes when the tensile member is bent in one direction and the cross slot opens when the tensile member is bent in the opposite direction.
EFFECT: is aimed at increasing the functional reliability of the device.
16 cl, 10 dwg
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