Undertaking
Patent
1977-06-03
1980-04-22
Browne, William R.
Undertaking
272DIG4, A63B 508
Patent
active
041991362
ABSTRACT:
An exercising apparatus is similar in its mode of action to a trampoline, and uses a flexible semi-rigid and elongated sheet which may be made of plastic or metal. A frictional pad is provided to avoid slipping as the user bounces on the apparatus. The flexible sheet may be supported at both ends either by a structure which is secured to both ends of the elongated flexible sheet, or by supports upon which it rests. In order to accommodate both heavy and light persons, and persons who want more vigorous bouncing action than those who desire less bounce, the apparatus is provided with various arrangements for increasing or decreasing the deflection versus force characteristic. In one species of the invention the underside of the elongated flexible sheet is provided with a number of grooves for selectively engaging the underlying support either closer or farther away from the end of the sheet. In another embodiment two sheets of different flexibility are provided and the apparatus may be turned over to get greater or lesser flexibility. In another embodiment made of one piece of metal with the ends turned under, arrangements are provided for mechanically engaging the upper and lower portions, thereby reducing the effective length of the flexible member. The supports may be provided with underlying rubber cushions with frictional engagement with the floor.
REFERENCES:
patent: 2730412 (1956-01-01), Yoder
patent: 3850264 (1974-11-01), Salinas
patent: 4018438 (1977-04-01), Shoger
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