Tunnel excavator
US4387928A · kind A · utility
1Cited by
10References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Mar 27, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D9/0875
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An excavator has a support mountable within the hull of a tunneling shield. A swing frame is rotatably journalled in the support about an axis canted with respect to the axis of the tunnel to permit effective application of an excavating implement. A link has one end pivotally mounted on the swing frame for moving the other end so that it has a component of movement toward and away from the work face of the tunnel. A dipper arm is pivotally mounted between the link and the excavating implement. A hydraulic drive means rotates the swing frame and pivots the link, dipper arm, and excavating implement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.