Leg extension jumpers

Details Leg extension jumpers Leg extension jumpers

1981-02-23

1984-05-22

Hafer, Robert A.

Undertaking

36 78, 272 701, 272114, A61F 300

Patent

active

044492561

ABSTRACT:
A unique arrangement for leg extension jumpers consists of elastic members connecting movable extension tubes to guide tubes located at the front and rear of a foot platform. The foot platform is pivotally connected at its front to the front guide tube or tubes and at its rear to a support tube or tubes fixed to and extending above the rear guide tube or tubes. A leg strap is fixed to the top of the support tube or tubes. In one modification, a brace member pivoted to and extending between the lower ends of the front and rear extension tubes acts as a ground engaging member. In another modification, the brace member is pivoted to and extends between the bottom of the front guide tube and support tube. The pivoted structure forms a pivoted parallelogram which is normally held in rectangular configuration by the elastic members.

REFERENCES:
patent: 406328 (1889-07-01), Yagn
patent: 822448 (1906-06-01), Hanson
patent: 2783997 (1957-03-01), Gaffney et al.
patent: 2802217 (1957-08-01), Wilhoyte
patent: 3058120 (1962-10-01), Smith et al.
patent: 3102272 (1963-09-01), Emmert
patent: 3110492 (1963-11-01), Hoffmeister
patent: 3346882 (1967-10-01), Wilhoyte
patent: 3902199 (1975-09-01), Emmert

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