Underground excavating machine having independently movable half-frames
US3995907A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1974 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Aug 21, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D9/117
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The machine includes two half-frames vertically arranged side by side, with two parallel vertical shafts respectively supported by the two half-frames. A separate turret is pivotally supported around each of the shafts, each turret having a cutting head which can rotate around a horizontal axis and which is equipped with tools for excavating. The two half-frames are slidably movable horizontally in relation to one another, with a control member connected between the half-frames for controlling the relative movement, the two half-frames being selectively positionable on the gallery floor by said relative movement, one half-frame being movable while the other half-frame remains fixed in position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.