Abstract: A folding cutting board has a contiguous cutting surface, and an opposed surface subtended by four distinct and generally parallel grooves. The grooves form five body members, four which have approximately equal surface area and one which has a width approximately equal to twice the thickness of the substrate. With this relationship, the cutting board may be folded into a compact and durable structure for transport which requires only one quarter the surface area, and which still provides the solid, non-porous and uninterrupted surface for cutting or working. Special hinges are also illustrated herein having a smooth curve within the region of flexure which prevents undesired concentration of stress. In adjacent and relatively non-pliant regions, a second geometry is superimposed which serves to clear away obstacles, including fingers, from the hinge region during movement therein. Consequently, the hinge structure is a “no pinch” hinge.

Abstract: A mattress support device for a sofa sleeper for protecting an individual from the support bars beneath the mattress in a sofa sleeper. The mattress support device for a sofa sleeper includes a first section, a second section pivotally attached to the first section and a third section pivotally attached to the second section. The second section and the third section are pivotally attached to one another by a first hinge channel extending into an upper surface between thereof. The first section and second section are pivotally attached to one another by a second hinge channel extending into a lower surface between thereof. The first section, second section and third section are preferably comprised of a solid sheet structure with the channels formed or created within to create hinges within.

Abstract: A mattress support device for a sofa sleeper for protecting an individual from the support bars beneath the mattress in a sofa sleeper. The mattress support device for a sofa sleeper includes a first section, a second section pivotally attached to the first section and a third section pivotally attached to the second section. The second section and the third section are pivotally attached to one another by a first hinge channel extending into an upper surface between thereof. The first section and second section are pivotally attached to one another by a second hinge channel extending into a lower surface between thereof. The first section, second section and third section are preferably comprised of a solid sheet structure with the channels formed or created within to create hinges within.