Resilient unit with different major surfaces
AssigneeHarrison Spinks Components Limited
InventorsSimon Paul Spinks, David Clare
Life of this patent
Estimating the term…
Abstract
A resilient unit comprises a number of wire coil springs 12, each of which is located within its own discrete pocket 14 formed by first, upper and second, lower layers 14a and 14b of material, preferably of non-woven material. The two layers 14a and 14b have been thermally, or ultrasonically, welded together at points 16 between the adjacent springs to create the pockets. The upper layer of material 14a differs from the lower layer of material 14b in respect of at least one characteristic.
Claims31
A resilient unit suitable for providing comfort, convenience, support or protection, the unit comprising a pad having a plurality of individual coil springs of wire in an array, each spring having a spring axis and being substantially encased in an individual pocket formed between a first axially upper layer made of a first air permeable material and a second axially lower layer made of a second air permeable material, the first and second layers being joined at positions between the springs to form the pockets, wherein the first air permeable material and the second air permeable material are different materials, and
- wherein the first air permeable material of the first axially upper layer has a greater air permeability than the second air permeable material of the second axially lower layer such that air is allowed to circulate freely through the first axially upper layer and into spaces between the first axially upper layer and the second axially lower layer.
A method of producing a resilient unit suitable for providing comfort, convenience, support or protection, the unit comprising a pad having a plurality of individual coil springs of wire in an array, each spring having a spring axis and being substantially encased in an individual pocket formed between a first axially upper layer made of a first air permeable material and a second axially lower layer made of a second air permeable material, wherein the method comprises joining the first layer and the second layer at least at locations between the springs to form a plurality of discrete pockets between the layers, wherein the first air permeable material and the second air permeable material are different materials, and
- wherein the first air permeable material of the first axially upper layer has a greater air permeability than the second air permeable material of the second axially lower layer such that air is allowed to circulate freely through the first axially upper layer and into spaces between the first axially upper layer and the second axially lower layer.
Dependencies are inferred from the claim text.