US4133086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic springing shoe
Assignee: Individual
•
Filing: 1977-03-23
•
Granted: 1979-01-09
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Expires: 1997-03-23
Abstract
Abstract A springing-shoe having a foot supporting plate and a ground engaging plate is provided with pneumatic springing means secured between the plates for imparting vertical springing motion but no side sway or twisting motion when the shoe is being used for walking, running or jumping.
Inventors
- 👤 John L. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:02
CPC Classifications
A; A43; A43B; A43B5/00; A43B5/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A pneumatic springing-shoe comprising a foot supporting plate, a ground engaging plate, a pair of pneumatic springing means, fastening means constructed and arranged to fixedly secure said pneumatic springing means substantially vertically between said foot supporting plate and said ground engaging plate adjacent the forward and rear ends thereof respectively, and a valve associated with each of said pneumatic springing means for varying the resiliency thereof.
Claim 2
Dependent Claim
66 words
A pneumatic springing-shoe comprising a foot supporting plate, a ground engaging plate, a pair of pneumatic springing means, fastening means constructed and arranged to fixedly secure said pneumatic springing means substantially vertically between said foot supporting plate and said ground engaging plate adjacent the forward and rear ends thereof respectively, and a valve associated with each of said pneumatic springing means for varying the resiliency thereof.
Claim 3
Dependent Claim
24 words
A pneumatic springing-shoe according to claim 1 wherein said pneumatic springing means comprises a compressed air type shock absorber embodying a coil compression spring.
Claim 4
Dependent Claim
52 words
A pneumatic springing shoe according to claim 2 wherein the compressed air type shock absorber comprises an air cylinder in combination with said coil compression spring, and valve means in said air cylinder for varying the air pressure in said air cylinder thereby to vary the effective resiliency of said coil spring.
Claim 5
Dependent Claim
51 words
A pneumatic springing-shoe according to claim 3 wherein said fastening means comprises an annular flange at the upper and lower ends, respectively, of said compressed air type shock absorbers, and screws arranged to fixedly secure said flanges to adjacent surfaces of said foot supporting plate and said ground engaging plate, respectively.
Claim 6
Dependent Claim
20 words
A pneumatic springing-shoe according to claim 4 wherein said ground engaging plate has an anti-skid surface on the underside thereof.
Claim 7
Dependent Claim
39 words
A pneumatic springing-shoe according to claim 4 wherein each plate is substantially rectangular and the diameter of each of the said annular flanges of said compressed air type shock absorbers is substantially two-thirds the width of its respective plate.
Claim 8
Dependent Claim
18 words
A pneumatic springing-shoe according to claim 6 wherein each of said plates comprises a substantially rigid plastic material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |