BE471317A - - Google Patents
Info
- Publication number
- BE471317A BE471317A BE471317DA BE471317A BE 471317 A BE471317 A BE 471317A BE 471317D A BE471317D A BE 471317DA BE 471317 A BE471317 A BE 471317A
- Authority
- BE
- Belgium
- Prior art keywords
- emi
- column
- columns
- axis
- bosses
- Prior art date
Links
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 2
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
- E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
- E21D15/24—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism
- E21D15/26—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism with screw, worm, or the like, not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure
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)
- Helmets And Other Head Coverings (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE471317A true BE471317A (enExample) |
Family
ID=121216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE471317D BE471317A (enExample) |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE471317A (enExample) |
-
0
- BE BE471317D patent/BE471317A/fr unknown
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