GB699838A - Improved pit prop - Google Patents
Improved pit propInfo
- Publication number
- GB699838A GB699838A GB19364/51A GB1936451A GB699838A GB 699838 A GB699838 A GB 699838A GB 19364/51 A GB19364/51 A GB 19364/51A GB 1936451 A GB1936451 A GB 1936451A GB 699838 A GB699838 A GB 699838A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- aug
- welded
- group
- constituents
- 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
- 229910000831 Steel Inorganic materials 0.000 abstract 2
- 239000000470 constituent Substances 0.000 abstract 2
- 239000010959 steel Substances 0.000 abstract 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 2
- 229910052721 tungsten Inorganic materials 0.000 abstract 2
- 239000010937 tungsten Substances 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 239000011651 chromium Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000010936 titanium Substances 0.000 abstract 1
- 229910052719 titanium Inorganic materials 0.000 abstract 1
- 238000003466 welding Methods 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
- E21D15/42—Telescopic props with parts held relatively to each other by friction or gripping with special parts to influence the friction
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Electrotherapy Devices (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
699,838. Making pit props;. welding. HAARMANN, A. Aug. 16, 1951 [Aug. 19, 1950], No. 19364/51. Addition to 669,876, [Group X]. Classes 83(ii) and 83 (iv). [Also in Group X] The ribs 6 on the inner prop member 4 of the pit prop claimed in the parent Specification comprise steel of great hardness (between 400 and 650 Brinell) and are welded on by hard surfacing electrode means. The electrodes are of alloyed steel containing 1 to 2 per cent of chromium, 1 to 2 per cent of tungsten and about 1 per cent carbon. The tungsten content can be replaced, at least in part, by titanium. The electrodes consist of thin wire covered with a coating of mineral substances having acid and basic constituents which are able to form a readily flowing slag to protect the material to be welded and to prevent burning out of constituents of the alloy.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE699838X | 1950-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB699838A true GB699838A (en) | 1953-11-18 |
Family
ID=6608527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19364/51A Expired GB699838A (en) | 1950-08-19 | 1951-08-16 | Improved pit prop |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB699838A (en) |
-
1951
- 1951-08-16 GB GB19364/51A patent/GB699838A/en not_active Expired
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