GB781772A - Thrust mechanism for advancing coal extracting machinery towards a coal face - Google Patents
Thrust mechanism for advancing coal extracting machinery towards a coal faceInfo
- Publication number
- GB781772A GB781772A GB23736/54A GB2373654A GB781772A GB 781772 A GB781772 A GB 781772A GB 23736/54 A GB23736/54 A GB 23736/54A GB 2373654 A GB2373654 A GB 2373654A GB 781772 A GB781772 A GB 781772A
- Authority
- GB
- United Kingdom
- Prior art keywords
- jack
- pawl
- strut
- towards
- distancepiece
- 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
- 239000003245 coal Substances 0.000 title abstract 3
- 239000012530 fluid Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 230000002441 reversible effect Effects 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/08—Guiding the machine
- E21C35/12—Guiding the machine along a conveyor for the cut material
- E21C35/14—Equipment for pressing the conveyor towards the working face
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/08—Shifting conveyors or other transport devices from one location at the working face to another
- E21F13/086—Armoured conveyors shifting devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Actuator (AREA)
Abstract
781,772. Pushing jacks. DEMAGAKT.-GES. Aug. 16, 1954 [Aug. 14, 1953], No. 23736/54. Class 78 (3). A thrusting mechanism for advancing coalextracting machinery 5 towards a coal face comprises a double-acting fluid pressure jack 8, 9 and a reaction strut 11 connected to the jack by a rigid distance-piece which is of sufficient length to leave a space to permit the operator to move thereover. The distancepiece comprises a pair of telescoping channel members 15, 17 interconnected by a releasable and reversible spring-loaded pawl 20 on member 15 which engages holes 18 in member 17. The arrangement is such that with the chamfered face of the pawl in the position shown, reciprocation of the piston 8 in cylinder 9 produces a step-by-step movement which alternately advances the machine 5 and extends the distancepiece ; whilst when the pawl is reversed reciprocation of the piston alternately retracts the distance-piece and moves the strut towards the face. A further fluid pressure jack 27, 28 is provided to advance the strut towards the jack in one movement when the pawl is released. In a modification (not shown), the distancepiece consists solely of a jack. The strut 11 is shown as a pair of telescoping members held in their adjusted position by a locking pin, but according to a further modification (not shown) it may consist of a fluid pressure jack. The Specification states that all the jacks may be controlled remotely.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE781772X | 1953-08-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB781772A true GB781772A (en) | 1957-08-28 |
Family
ID=6692364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23736/54A Expired GB781772A (en) | 1953-08-14 | 1954-08-16 | Thrust mechanism for advancing coal extracting machinery towards a coal face |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB781772A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2948508A (en) * | 1957-03-15 | 1960-08-09 | Dowty Mining Equipment Ltd | Pushing device for shifting mining machinery |
-
1954
- 1954-08-16 GB GB23736/54A patent/GB781772A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2948508A (en) * | 1957-03-15 | 1960-08-09 | Dowty Mining Equipment Ltd | Pushing device for shifting mining machinery |
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