Patent US3903707A successfully refreshed from Google Patents.
US3903707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunneling shields
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1974-03-20
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Granted: 1975-09-09
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Expires: 1994-03-20
Abstract
Abstract A tunneling shield comprises pairs of forward and rearward support frames carrying sharp ended planks, the frames being supported on shoes slidable along abutments. Each frame is constructed in two sections which are pivoted together about an axis extending longitudinally of the shield. The lower ends of the sections of each pair are interconnected by an extensible strut or cross-brace.
Inventors
- 👤 Adolf Foik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:05
CPC Classifications
E; E21; E21D; E21D19/00; E21D19/04; E21D9/00; E21D9/06; E21D9/0692
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
204 words
A cutter shield, particularly a roof shield for driving underground tunnels and like excavations, comprising: first and second forward support frames each having a generally arched configuration and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the forward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, first and second rearward support frames each having a generally arched configuration, and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the rearward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, a first group of planks supported by said first support frames, a second group of planks supported by said secoNd support frames, means for displacing said first frames relative to said second frames, laterally spaced abutments with respect to which the ends of the support frames are to maintain a predetermined relationship, and means associated with the lower ends of the sections of each support frame for adjusting the spacing of said sections to compensate for irregularities in the spacing of the abutments.
Claim 2
Dependent Claim
204 words
A cutter shield, particularly a roof shield for driving underground tunnels and like excavations, comprising: first and second forward support frames each having a generally arched configuration and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the forward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, first and second rearward support frames each having a generally arched configuration, and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the rearward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, a first group of planks supported by said first support frames, a second group of planks supported by said secoNd support frames, means for displacing said first frames relative to said second frames, laterally spaced abutments with respect to which the ends of the support frames are to maintain a predetermined relationship, and means associated with the lower ends of the sections of each support frame for adjusting the spacing of said sections to compensate for irregularities in the spacing of the abutments.
Claim 3
Dependent Claim
34 words
Apparatus as claimed in claim 1, wherein the means associated with the lower ends of the sections of each support frame is a strut and means is provided for lengthening and shortening said strut.
Claim 4
Dependent Claim
60 words
Apparatus as claimed in claim 1, further including a beam extending between the lower ends of the two sections constituting each support fraame, and piston and cylinder means interconnecting each of said sections to said beam, the connection between each said piston and cylinder means and the respective frame section being pivotal about an axis extending longitudinally of the apparatus.
Claim 5
Dependent Claim
37 words
Apparatus as claimed in claim 3, further including sliding shoes bearing on said abutments, each frame section being supported on a respective shoe by means of a pair of piston and cylinder means inclined towards each other.
Claim 6
Dependent Claim
234 words
A cutter shield, particularly a roof shield for driving underground tunnels and the like excavations, comprising: first and second forward support frames each having a generally arched configuration and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the forward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, first and second rearward support frames each having a generally arched configuration and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the rearward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, a first group of planks supported by said first support frames, a second group of planks supported by said second support frames, means for displacing said first frames relative to said second frames, laterially spaced abutments with respect to which the ends of the support frames are to maintain a predetermined relationship, sliding shoes bearing on said abutments, each frame section being supported on a respective shoe by means of a pair of piston and cylinder means inclined towards each other, and means associated with the lower ends of the sections of each support frame for adjusting the spacing of said sections to compensate for irregularities in the spacing of the abutments.
Claim 7
Dependent Claim
234 words
A cutter shield, particularly a roof shield for driving underground tunnels and the like excavations, comprising: first and second forward support frames each having a generally arched configuration and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the forward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, first and second rearward support frames each having a generally arched configuration and comprising two sections which are substantially symmetrical about the peak of the arch which they together form, said sections of the rearward support frames being interconnected at said peak for pivotal movement about an axis extending longitudinally of the apparatus, a first group of planks supported by said first support frames, a second group of planks supported by said second support frames, means for displacing said first frames relative to said second frames, laterially spaced abutments with respect to which the ends of the support frames are to maintain a predetermined relationship, sliding shoes bearing on said abutments, each frame section being supported on a respective shoe by means of a pair of piston and cylinder means inclined towards each other, and means associated with the lower ends of the sections of each support frame for adjusting the spacing of said sections to compensate for irregularities in the spacing of the abutments.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |