Leg extension jumpers
OwnerMelvin L. Prueittinventor
Life of this patent
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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.
Claims3
A leg extension jumper device controlled by toe and heel action comprising in combination:
- (a) vertical front and rear guide tube means,
- (b) an extension tube extending through each guide tube means,
- (c) elastic means connecting the top portion of each extension tube and the bottom portion of its respective guide tube means,
- (d) support tube means fixed to and extending above the level of the rear guide tube means,
- (e) a leg strap fixed to the top of said support tube means,
- (f) foot platform means pivotally connected at its front near the top of said front guide tube means and near its rear to the support tube means with the rear pivot being located directly under the ankle of a user,
- (g) foot means associated with the bottoms of the front and rear extension tubes;
- and brace means pivotally connecting either the lower portions of the front and rear extension tube means, or the lower portion of the front guide tube means and the support tube means which, together with the foot platform means, creates a substantially pivoted parallelogram which is biased towards a rectangle by the elastic means.
Dependencies are inferred from the claim text.