Patent US3657897A successfully refreshed from Google Patents.
US3657897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnelling shield
Assignee: Individual
•
Filing: 1971-02-16
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Granted: 1972-04-25
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Expires: 1991-02-16
Abstract
Abstract A tunnelling shield mainly consists of a heavy steel tube provided with cutting segments about its front rim and having an annular collar on its outer axial wall near the rim. Pouches of elastomeric material are distributed about the rear face of the collar and can be inflated by means of hydraulic fluid. Concrete injecting conduits terminate in orifices in the outer tube wall which are directed toward the rear face of the collar so that a tunnel lining can be poured in the space behind the collar bounded by the shield in a radially inward direction, and the shield can be driven forward by expansion of the pouches abutting against the last-cured concrete section.
Inventors
- 👤 Josef Krismer Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:55
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/06; E21D9/0607
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A tunnelling shield comprising, in combination: a. a tubular body portion having an axis, and an outer axial wall and an annular front rim about said axis; b. cutting means axially projecting from said rim in a forward direction; c. a collar projecting from said outer wall adjacent said front rim in a radially outward direction, said collar being fixedly fastened to said body portion and having a radially extending, rearwardly directed face; d. expansion means on said face, said expansion means including at least one element of elastomeric material enclosing a sealed cavity, and supply means communicating with said cavity for supplying to said cavity a fluid under pressure and for thereby expanding said element in an axial direction; and e. injecting means for injecting concrete mixture into a space bounded by said face and said wall, said injecting means including a feed conduit having an orifice adjacent said element.
Claim 2
Dependent Claim
151 words
A tunnelling shield comprising, in combination: a. a tubular body portion having an axis, and an outer axial wall and an annular front rim about said axis; b. cutting means axially projecting from said rim in a forward direction; c. a collar projecting from said outer wall adjacent said front rim in a radially outward direction, said collar being fixedly fastened to said body portion and having a radially extending, rearwardly directed face; d. expansion means on said face, said expansion means including at least one element of elastomeric material enclosing a sealed cavity, and supply means communicating with said cavity for supplying to said cavity a fluid under pressure and for thereby expanding said element in an axial direction; and e. injecting means for injecting concrete mixture into a space bounded by said face and said wall, said injecting means including a feed conduit having an orifice adjacent said element.
Claim 3
Dependent Claim
40 words
A shield as set forth in claim 1, wherein said face is annular about said axis, and said expansion means include a plurality of elements of said material circumferentially distributed about said face and each communicating with said supply means.
Claim 4
Dependent Claim
32 words
A shield as set forth in claim 1, said collar being formed with a plurality of circumferentially elongated, circumferentially offset recesses in said face, said elements being received in said recesses respectively.
Claim 5
Dependent Claim
21 words
A shield as set forth in claim 2, wherein said injecting means have a plurality of orifices respectively adjacent said elements.
Claim 6
Dependent Claim
48 words
A shield as set forth in claim 1, further comprising rinsing means for rinsing said feed conduit of concrete mixture, said rinsing means including a conduit entering said orifice in a direction opposite to the direction of flow of said mixture from said conduit outwardly of said orifice.
Claim 7
Dependent Claim
22 words
A shield as set forth in claim 1, wherein said outer wall tapers in an axial direction away from said front rim.
Claim 8
Dependent Claim
29 words
A shield as set forth in claim 1, wherein said body portion is formed with a radial aperture therethrough connecting the interior of said body portion with said space.
Claim 9
Dependent Claim
16 words
A shield as set forth in claim 1, wherein said orifice is directed toward said face.
Claim 10
Dependent Claim
91 words
A shield as set forth in claim 1, wherein said body portion is constituted by a plurality of circumferential segments, one of said segments having two circumferentially spaced end faces abuttingly engaging corresponding faces of adjacent segments, said end faces of said one segment converging in a radially outward direction at an angle sufficient to permit said one section to be withdrawn inward toward the axis of said body portion, and fastening means releasably securing said one body portion in abutting relationship of said end faces Thereof with said corresponding faces.
Claim 11
Dependent Claim
43 words
A shield as set forth in claim 1, further comprising a tubular rear portion substantially coaxial with said body portion and extending rearward from the same, the cross section of said rear portion being smaller than the cross section of said body portion.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |