PL77728B1 - Key unit for mine caps[bg28277a3] - Google Patents
Key unit for mine caps[bg28277a3] Download PDFInfo
- Publication number
- PL77728B1 PL77728B1 PL14936771A PL14936771A PL77728B1 PL 77728 B1 PL77728 B1 PL 77728B1 PL 14936771 A PL14936771 A PL 14936771A PL 14936771 A PL14936771 A PL 14936771A PL 77728 B1 PL77728 B1 PL 77728B1
- Authority
- PL
- Poland
- Prior art keywords
- canopy
- canopies
- head
- excavation
- string
- Prior art date
Links
- 238000009412 basement excavation Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 3
- 241000283070 Equus zebra Species 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 230000003245 working effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
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)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Tents Or Canopies (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HUBA002505 | 1970-12-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL77728B1 true PL77728B1 (en) | 1975-04-30 |
Family
ID=10993325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL14936771A PL77728B1 (en) | 1970-12-09 | 1971-07-10 | Key unit for mine caps[bg28277a3] |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT311910B (de) |
| BG (1) | BG28277A3 (de) |
| CS (1) | CS153588B2 (de) |
| DE (1) | DE2133640A1 (de) |
| PL (1) | PL77728B1 (de) |
| RO (1) | RO58812A (de) |
-
1971
- 1971-07-06 DE DE19712133640 patent/DE2133640A1/de active Pending
- 1971-07-07 AT AT590571A patent/AT311910B/de not_active IP Right Cessation
- 1971-07-10 PL PL14936771A patent/PL77728B1/pl unknown
- 1971-07-21 BG BG018129A patent/BG28277A3/xx unknown
- 1971-07-22 RO RO6776271A patent/RO58812A/ro unknown
- 1971-08-09 CS CS575171A patent/CS153588B2/cs unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2133640A1 (de) | 1972-06-22 |
| BG28277A3 (en) | 1980-03-25 |
| RO58812A (de) | 1975-09-15 |
| CS153588B2 (de) | 1974-02-25 |
| AT311910B (de) | 1973-12-10 |
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