Patent US3931881A successfully refreshed from Google Patents.
US3931881A
Expired / Lapsed
US
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Continuous belt system holding multiple layers
Assignee: McDonnell Douglas Corp
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Filing: 1973-10-02
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Granted: 1976-01-13
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Expires: 1993-10-02
Abstract
Abstract A continuous belt system engaging and holding for parallel motion multiple layers of fabric. A pair of belts holds the layers along their edges in stacked spaced relationship while the layers pass through tufting and foaming stations in the manufacture of three-dimensional reinforced insulation.
Inventors
- 👤 Frederic W. Bickel
- 👤 Richard L. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:12
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/24; B29C44/00; B29C44/20; B29C44/32; B29C44/332; B65; B65G; B65G15/00; B65G15/10; B65G15/12; B65G15/14; B65G2201/00; B65G2201/02; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1712
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A continuous belt systems for holding multiple layers, said system comprising: a pair of endless belts having vertical parallel spaced surfaces defining a path of travel; said surfaces having gripping means thereon to retain multiple stacked and spaced layers therebetween; said gripping means comprising closed slits in said surfaces; means applying said gripping means to said layers at the start of said path of travel by opening said slits to permit insertion therein of edges of said layers and closing said slits after said edges are inserted; said means for opening said slits comprising a convex bulge device for flexing the midportions of each belt inwardly toward each other including rollers on the top and bottom inside edges of said belts and rollers at the midsection of said belts on the outside surface thereof; and means releasing said layers from said gripping means at the end of said path.
Claim 2
Dependent Claim
149 words
A continuous belt systems for holding multiple layers, said system comprising: a pair of endless belts having vertical parallel spaced surfaces defining a path of travel; said surfaces having gripping means thereon to retain multiple stacked and spaced layers therebetween; said gripping means comprising closed slits in said surfaces; means applying said gripping means to said layers at the start of said path of travel by opening said slits to permit insertion therein of edges of said layers and closing said slits after said edges are inserted; said means for opening said slits comprising a convex bulge device for flexing the midportions of each belt inwardly toward each other including rollers on the top and bottom inside edges of said belts and rollers at the midsection of said belts on the outside surface thereof; and means releasing said layers from said gripping means at the end of said path.
Claim 3
Dependent Claim
66 words
A continuous belt system as set forth in claim 1 wherein said means closing said slits is a concave curvature device flexing the midportions of each belt outwardly from each other, said concave curvature device including rollers on the top and bottom edges of said belts angularly oriented relative to the plane of said belt and bearing against said belt to flex said belt midportion outwardly.
Claim 4
Dependent Claim
28 words
A continuous belt system as set forth in claim 1 wherein said rollers are moveable relative to each other and to the path of travel of said belts.
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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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |