GB702411A - Improvements in lifting and thrusting apparatus - Google Patents
Improvements in lifting and thrusting apparatusInfo
- Publication number
- GB702411A GB702411A GB1842051A GB1842051A GB702411A GB 702411 A GB702411 A GB 702411A GB 1842051 A GB1842051 A GB 1842051A GB 1842051 A GB1842051 A GB 1842051A GB 702411 A GB702411 A GB 702411A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rack
- casing
- bar
- prop
- automatically
- 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
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
Classifications
-
- 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
- E21F13/06—Transport of mined material at or adjacent to the working face
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)
- Transmission Devices (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
702,411. Jacks; ratchet gearing, actuated by levers. McHUGH & CO., Ltd., A. S., WOOD & CO:, Ltd., H., and SMITH, G.S. Nov. 12, 1951 [Aug. 3, 1951], No. 18420/51. Class 78 (3) A thrusting jack consists of a rack bar 10 driven outwardly from a casing 1 by a mechanism 7 which is as described in Specification 582,998, and has a mechanism for automatically friction braking the rack in any position of adjustment, and for automatically freeing it when the rack is further extended by actuation of the ratchet driving lever 11 ; the casing 1 having a ground engaging foot 2 and being pivoted at 30 to a pit prop or jack 3 which, when engaged with a mine roof provides a reaction member for the rack. A detachable spring link connection 5 is'provided between the prop and casing. In a. modification (Fig. 4) the rack is replaced by a bar 12 slidably mounted in a casing 13, and having a chain 14 which is adjustably secured thereto at 17, 18, and passes over a driving sprocket 21 and guide rollers 19, 20.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1842051A GB702411A (en) | 1951-08-03 | 1951-08-03 | Improvements in lifting and thrusting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1842051A GB702411A (en) | 1951-08-03 | 1951-08-03 | Improvements in lifting and thrusting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB702411A true GB702411A (en) | 1954-01-13 |
Family
ID=10112136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1842051A Expired GB702411A (en) | 1951-08-03 | 1951-08-03 | Improvements in lifting and thrusting apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB702411A (en) |
-
1951
- 1951-08-03 GB GB1842051A patent/GB702411A/en not_active Expired
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