1978-09-29
1981-12-29
Pinkham, Richard C.
Undertaking
273 55R, 273DIG7, 273DIG29, A63J 300
Patent
active
043078796
ABSTRACT:
An extended athletic playing surface that increases running speed of an athlete performing on the surface and reduces the likelihood of injury to the athlete has a multi-layer construction. The athlete's foot impacts on an upper surface of a sheet material that has a low mass per unit area and is stiffly resilient. The upper surface is supported on either discrete "bumper pads" of a resilient material, or preferably a combination of horizontal, spaced apart supports and bumper pads. The composite structure rests on a conventional surface such as a concrete base. The composite surface is characterized by a low effective vertical mass and a composite vertical compliance that is extremely large in comparison to any comparable known athletic surface. The surface also has a high effective horizontal mass and a low horizontal compliance. In the preferred form, this composite surface is also characterized by a mechanical response that is substantially independent of the point of the impact on the surface, independent of the area of the foot contact, and independent of the presence of other athletes on the surface.
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Material Titled "Improvements in Racing Tracks", submitted by applicant, Author and date not known.
Greene Peter R.
McMahon Thomas A.
Kramer Arnold W.
Pinkham Richard C.
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