Motor vehicle seat cushion
The invention concerns a cushion or cushioning comprising, a cover an outer covering layer, a middle foam layer and an inner mesh layer. The cushion also includes an electric circuit connected to an electric generator, the circuit being made from conductive ink deposited on a support layer. The circuit extends opposite the complex; a block of elastically compressible padding, the support layer being formed either by the inner layer, or by an additional mesh layer interposed between the inner layer and the block.
1. A cushion for a motor vehicle seat, comprising consecutively:
a cover for lining a block of padding, the cover having a complex comprising, in sequence:
an outer covering layer,
a middle foam layer,
an inner mesh layer, comprising a network of intertwined yarns of a yarn loop passing through another,
an electric circuit intended to be connected to an electric generator, the electric circuit being made from conductive ink deposited on a support layer, the electric circuit extending opposite the complex,
a block of elastically compressible padding,
wherein the support layer is formed by the inner mesh layer, and
wherein the inner mesh layer comprises 6-10 columns of yarns/cm, 5-10 rows of yarns/cm, a surface density of from 25 to 50 g/m 2 , and a weight of the yarns of from 40 to 120 dtex.
2. The cushion according to claim 1 , wherein the electric circuit is configured to form a heating resistance.
3. The cushion according to claim 1 , wherein the electric circuit comprises a coupler for coupling to a system for detecting the presence of an occupant of the cushion, to carry out the deployment of a safety device in case of an accident only when the cushion is occupied according to predefined criteria.
4. The cushion according to claim 1 , wherein the cushion further comprises an additional layer on a surface of the inner mesh layer opposite the middle foam layer, wherein the additional layer comprises 11-16 columns of yarns/cm, 15-30 rows of yarns/cm, a surface density of from 175 to 250 g/m 2 , and a weight of the yarns of from 40 to 200 dtex.
5. The cushion according to claim 1 , wherein the cover is fitted on the block of padding.
6. The cushion according to claim 1 , wherein the cover is overmoulded, at least partially, by the block of padding, the block of padding being made from a moulded foam.
7. The cushion according to claim 1 , wherein the conductive ink comprises a polyurethane matrix in which conductive particles are dispersed.
8. The motor vehicle seat comprising a framework and a cushioning according to claim 1 , the cushioning being mounted as a covering of the framework.