GB942279A - Improvements relating to self-advancing roof supports - Google Patents
Improvements relating to self-advancing roof supportsInfo
- Publication number
- GB942279A GB942279A GB599361A GB599361A GB942279A GB 942279 A GB942279 A GB 942279A GB 599361 A GB599361 A GB 599361A GB 599361 A GB599361 A GB 599361A GB 942279 A GB942279 A GB 942279A
- Authority
- GB
- United Kingdom
- Prior art keywords
- self
- clamps
- advancing
- advance
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005065 mining Methods 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
942,279. Self-advancing pit props. DOWTY MINING EQUIPMENT Ltd. April, 26 1962 [Feb. 17, 1961], No. 5993/61. Heading E1E. A self-advancing roof support comprises two frame units C, D having longitudinally-extending guide means to which transverse beams E, F are selectively clamped by pairs of diagonallyopposed clamps A, B-the arrangement being such that when one pair of opposed clamps A are in the locking condition a double-action jack G disposed between the beams E, F can advance one frame unit relative to the other and when the other pair of opposed clamps 13 are in the locking position the jack can continue the advance of the said one frame unit relative to the other. The clamps may be hydraulically actuated and may include a wedge which can be forced between the beam and the wall of the guideway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB599361A GB942279A (en) | 1961-02-17 | 1961-02-17 | Improvements relating to self-advancing roof supports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB599361A GB942279A (en) | 1961-02-17 | 1961-02-17 | Improvements relating to self-advancing roof supports |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB942279A true GB942279A (en) | 1963-11-20 |
Family
ID=9806456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB599361A Expired GB942279A (en) | 1961-02-17 | 1961-02-17 | Improvements relating to self-advancing roof supports |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB942279A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2539810A1 (en) * | 1983-01-25 | 1984-07-27 | Manche Atel Chantiers | Lemniscate-type movable supporting chock with a base made of two elements which can slide independently of each other |
-
1961
- 1961-02-17 GB GB599361A patent/GB942279A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2539810A1 (en) * | 1983-01-25 | 1984-07-27 | Manche Atel Chantiers | Lemniscate-type movable supporting chock with a base made of two elements which can slide independently of each other |
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