US4725070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection skis and their process of manufacture
Assignee: Swallow Ski KK
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Filing: 1986-06-12
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Granted: 1988-02-16
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Expires: 2006-06-12
Abstract
Abstract Ski upper- and lower-surface constituting materials are set in position in a mold provided with a space appropriate for the dimensional distribution of the padding for the ski. The ski upper-surface constituting material is arranged so that a resin sheet of ABS resin, etc. constitutes the outer surface of ski. The inner upper surface of the upper mold piece is formed in a curved surface having, for example, grooves. A foamy resin is injected to fill the space between the ski upper and lower constituting materials. The foaming pressure raised by the foamy resin will press the resin sheet against the inner upper surface of the upper mold piece with resulting deformation of the resin sheet. Thus one may obtain a ski which is provided on its upper surface with projections.
Inventors
- 👤 Tetsuzo Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:51
CPC Classifications
A; A63; A63C; A63C5/00; A63C5/003; A63C5/12; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/14; B29C44/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
An injection ski, comprising: a ski upper surface material and a ski lower surface material which define a space therebetween; a reinforcing network sheet structure comprising parallel glass fibers and bendable wires interleaved with said glass fibers in a direction perpendicular to said glass fibers, said wires being bendable into a predetermined shape; and a foaming resin injected into said space which fills said space and fills network gaps between said glass fibers and said wires.
Claim 2
Dependent Claim
76 words
An injection ski, comprising: a ski upper surface material and a ski lower surface material which define a space therebetween; a reinforcing network sheet structure comprising parallel glass fibers and bendable wires interleaved with said glass fibers in a direction perpendicular to said glass fibers, said wires being bendable into a predetermined shape; and a foaming resin injected into said space which fills said space and fills network gaps between said glass fibers and said wires.
Claim 3
Dependent Claim
18 words
The ski of claim 1, wherein said reinforcing network sheet structure contains nylon threads and glass fiber tapes.
Claim 4
Dependent Claim
27 words
The ski of claim 1, wherein a single piece of said reinforcing network material is adjacent said ski upper surface material and said ski lower surface material.
Claim 5
Dependent Claim
35 words
The ski of claim 3, wherein said glass fibers are arranged in the longitudinal direction of said ski and said bendable wires are arranged in a direction perpendicular to the longitudinal direction of said ski.
Claim 6
Dependent Claim
18 words
The ski of claim 4, wherein said wires contact a right and left side surface of said ski.
Claim 7
Dependent Claim
20 words
The ski of claim 1, wherein said reinforcing network sheet structure is bent in the configuration shown in FIG. 16.
Claim 8
Dependent Claim
24 words
The ski of claim 1, wherein said wires can be bent into a predetermined shape and can hold said predetermined shape after being bent.
Claim 9
Dependent Claim
20 words
The ski of claim 1, wherein glass fibers for said reinforcing material are glass fiber tapes impregnated with epoxy resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |