US Patent 8104575 Support pad apparatus

A support pad apparatus, including a rigid platform and a load-spreading conformable pad thereunder that conforms to the bottom surface of the platform and may either be flat or concave along its bottom surface to engage the surface of a flat, uneven or sloped roof or some other type of flat, uneven or sloped hard or soft underlying surface, both within and outside of a building, or in any other appropriate setting. The top of the platform contains the structural means to ensure that the person working, standing or walking upon the platform is able to maintain a secure, stable, and balanced footing.