US3677015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel lining
Assignee: Commercial Shearing Inc
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Filing: 1971-03-24
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Granted: 1972-07-18
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Expires: 1991-03-24
Abstract
Abstract A tunnel liner is provided in the form of a plurality of rectilinear arcuate side by side members forming a cylinder, each member having inturned flange on all edges, a triangular low compressibility elastomer member on each corner of each arcuate member, a layer of elastomer foam on each flange surface and triangular member, and means acting on adjacent flanges to draw them together and place the foam under compression.
Inventors
- 👤 Nicholas Chlumecky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:00
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/14; E21D11/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A tunnel liner comprising a plurality of rectilinear arcuate side by side rigid members forming a cylinder, said arcuate members having inturned flanges on all edges, a triangular low compressibility substantially rigid elastomer member on each corner of said arcuate member forming with adjacent flanges a right angle, a layer of foamed elastomer on each flange surface and triangular member, said arcuate members being drawn together at the flanges to place the facing elastomer layers under compression and means acting on said flanges to draw them together.
Claim 2
Dependent Claim
87 words
A tunnel liner comprising a plurality of rectilinear arcuate side by side rigid members forming a cylinder, said arcuate members having inturned flanges on all edges, a triangular low compressibility substantially rigid elastomer member on each corner of said arcuate member forming with adjacent flanges a right angle, a layer of foamed elastomer on each flange surface and triangular member, said arcuate members being drawn together at the flanges to place the facing elastomer layers under compression and means acting on said flanges to draw them together.
Claim 3
Dependent Claim
22 words
A tunnel liner as claimed in claim 1 wherein the foamed elastomer is foamed neoprene and the triangular member is solid neoprene.
Claim 4
Dependent Claim
52 words
A tunnel liner as claimed in claim 1 wherein said arcuate members are drawn together at the flanges by bolts passing through holes in said flanges to place the elastomer layers under compression and elastomer sealing means is provided on said bolts between said bolts and sealing said bolts to said flanges.
Claim 5
Dependent Claim
21 words
A tunnel liner as claimed in claim 3 wherein the sealing means are metal washers having a foam neoprene layer thereon.
References Cited (Backward Citations)
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Cited
US2899720A
Cited
US935376A
Cited
US1779275A
Cited
US2077137A
Cited
US3023466A
Cited
US3553301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |