US3741540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nether limbs training implement
Assignee: Individual
•
Filing: 1972-01-03
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Granted: 1973-06-26
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Expires: 1992-01-03
Abstract
Abstract A nether limbs training implement having footboards having formed on its surface a plurality of protuberances, the footboard being jointed to a base block so that the footboard is swingable upwards. Springs are disposed between the footboard and base block to provide a force acting to push up one side of each of the footboards. One footboard has a spring mounted underneath that forces a steel ball into grooves on the shaft supporting the footboards.
Inventors
- 👤 Y Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:23
CPC Classifications
A; A63; A63B; A63B23/00; A63B23/035; A63B23/04; A63B23/08; A63B23/085; A63B22/00; A63B22/0048; A63B22/0056; A63B22/0025; A63B2022/0038; A63B21/00; A63B21/02; A63B21/023; A63B21/05; A63B23/0405; A63B23/0429
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A nether limbs training implement comprising a base block, a first footboard provided with a plurality of protuberances on the surface thereof, a joining metal fitting which pivotally joins said first footboard to said base block, a spring means disposed between said base block and said first footboard and positioned to normally push up one end of said first footboard, a second first footboard provided in juxtaposition to saId first footboard, said second footboard having a metal fitting joint, which pivotally joins said second footboard to said base blocks, spring means disposed between said base blocks and said second footboard and positioned to normally push up one end of said second footboard, an elongated stem-like bar formed with several circumferential grooves which is journalled in one of said joint fittings of said respective footboards, a spring housing element positioned on the underside of one of said footboards, a spring disposed in said spring housing, and a steel ball fittable in one of said grooves and pressed by said spring.
Claim 2
Dependent Claim
169 words
A nether limbs training implement comprising a base block, a first footboard provided with a plurality of protuberances on the surface thereof, a joining metal fitting which pivotally joins said first footboard to said base block, a spring means disposed between said base block and said first footboard and positioned to normally push up one end of said first footboard, a second first footboard provided in juxtaposition to saId first footboard, said second footboard having a metal fitting joint, which pivotally joins said second footboard to said base blocks, spring means disposed between said base blocks and said second footboard and positioned to normally push up one end of said second footboard, an elongated stem-like bar formed with several circumferential grooves which is journalled in one of said joint fittings of said respective footboards, a spring housing element positioned on the underside of one of said footboards, a spring disposed in said spring housing, and a steel ball fittable in one of said grooves and pressed by said spring.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |