US4534676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excavating and propelling machine for laying pipelines underground
Assignee: Komatsu Ltd
•
Filing: 1983-12-22
•
Granted: 1985-08-13
•
Expires: 2003-12-22
Abstract
Abstract An excavating and propelling machine for laying pipelines underground has a plum-pudding stone crusher device comprising a plurality of rod-shaped rotary teeth formed integrally on the rear face of a disk-shaped rotating cutter head in a manner of extending radially at uniform intervals spaced apart from one another and a plurality of rod-shaped stator teeth formed integrally on the front surface of an annular front face plate in a manner of extending radially at uniform intervals space apart from one another. The rotary teeth and the stator teeth are disposed in the vicinity of each other.
Inventors
- 👤 Hiroshi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:19
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/42; E21B21/00; E21B21/12; E21B7/00; E21B7/20; E21B7/208; E21D; E21D9/00; E21D9/06; E21D9/0642; E21D9/0657; E21D9/10; E21D9/11; E21D9/112; E21D9/12; E21D9/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
An excavating and propelling machine for laying pipelines underground, comprising a disk-shaped rotating cutter head having a plurality of excavating bits and a plurality of excavated earth and sand intake ports and adapted to be mounted on the leading end of a pilot excavator device body arranged to propel underground ahead of a pipeline to be laid underground; a plurality of rod-shaped rotary teeth formed integrally on the rear face of said cutter head in a manner of extending radially at uniform intervals spaced apart from one another; an annular front face plate having a plurality of excavated earth and sand passage holes communicating with the inside of said pilot excavator device body and located adjacent and opposite to said cutter head; and a plurality of rod-shaped stator teeth formed integrally on the front surface of the front face plate in a manner of extending radially at uniform intervals spaced apart from one another, said rotary teeth and said stator teeth forming in combination a plum-pudding stone crusher device.
Claim 2
Dependent Claim
169 words
An excavating and propelling machine for laying pipelines underground, comprising a disk-shaped rotating cutter head having a plurality of excavating bits and a plurality of excavated earth and sand intake ports and adapted to be mounted on the leading end of a pilot excavator device body arranged to propel underground ahead of a pipeline to be laid underground; a plurality of rod-shaped rotary teeth formed integrally on the rear face of said cutter head in a manner of extending radially at uniform intervals spaced apart from one another; an annular front face plate having a plurality of excavated earth and sand passage holes communicating with the inside of said pilot excavator device body and located adjacent and opposite to said cutter head; and a plurality of rod-shaped stator teeth formed integrally on the front surface of the front face plate in a manner of extending radially at uniform intervals spaced apart from one another, said rotary teeth and said stator teeth forming in combination a plum-pudding stone crusher device.
Claim 3
Dependent Claim
36 words
The excavating and propelling machine for laying pipelines underground as claimed in claim 1, said rod-shaped stator teeth are diverged radially and tangentially from the inner circumference of the annular front face plate at uniform intervals.
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |