Patent US4057971A successfully refreshed from Google Patents.
US4057971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brush-type packing means for shield excavator
Assignee: Tekken Construction Co Ltd
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Filing: 1976-05-25
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Granted: 1977-11-15
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Expires: 1996-05-25
Abstract
Abstract A brush-type packing means for shield tunnel excavators which is high in wear resistance and shielding effect against underground water is provided. The packing means comprises at least two rows of resilient wire brushes secured substantially in parallel ring shape along inner periphery of substantially cylindrical excavator body adjacent its tail end or peripheral edge of tunnel entrance on wall surface of vertical shaft as spaced in tunnelling direction to close a gap space between the tail end or the entrance edge and peripheral surface of tunnel wall element inserted in excavated tunnel, and the space between the respective rows of the wire brushes is sealed with a material which is viscous and impermeable to water.
Inventors
- 👤 Hironobu Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:36
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/005; E21D11/00; E21D11/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A brush-type packing means for a shield tunnel excavator comprising at least two rows of substantially ring-shaped wire brushes respectively made of wires bunched and having a high resiliency and wear resistance and spaced in the longitudinal direction of said excavator providing substantially an annular space therebetween each said ring-shaped brush being secured along the inner periphery of a substantially cylindrical excavator body adjacent the tail end thereof and projected inward at its free end, means for securing said brushes to a position for closing a gap between tunnelled ground surface and peripheral surface of a tunnel wall element inserted in excavated tunnel, and a viscous sealing material impermeable to water and substantially filled in said annular space, said sealing material having a fluidity suitable for permeating into clearances between respective wires of said brush but not passing through the brush.
Claim 2
Dependent Claim
141 words
A brush-type packing means for a shield tunnel excavator comprising at least two rows of substantially ring-shaped wire brushes respectively made of wires bunched and having a high resiliency and wear resistance and spaced in the longitudinal direction of said excavator providing substantially an annular space therebetween each said ring-shaped brush being secured along the inner periphery of a substantially cylindrical excavator body adjacent the tail end thereof and projected inward at its free end, means for securing said brushes to a position for closing a gap between tunnelled ground surface and peripheral surface of a tunnel wall element inserted in excavated tunnel, and a viscous sealing material impermeable to water and substantially filled in said annular space, said sealing material having a fluidity suitable for permeating into clearances between respective wires of said brush but not passing through the brush.
Claim 3
Dependent Claim
14 words
The packing means according to claim 1 wherein said sealing material is a grease.
Claim 4
Dependent Claim
37 words
The packing means according to claim 1 wherein said ring-shaped brushes are secured along peripheral edge of an entrance hole of said tunnel at a wall surface of a vertical shaft from which the tunnel is excavated.
Claim 5
Dependent Claim
18 words
The packing means according to claim 1 wherein said wires are respectively crimped and entangled with each other.
Claim 6
Dependent Claim
16 words
The packing means according to claim 1 wherein said bunched wires are made from hard steel.
Claim 7
Dependent Claim
16 words
The packing means according to claim 1 wherein said bunched wires are made from stainless steel.
Claim 8
Dependent Claim
16 words
The packing means according to claim 1 wherein said bunches wires are made from piano wire.
Claim 9
Dependent Claim
17 words
The packing means according to claim 1 wherein said bunched wires are made from a synthetic resin.
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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |