FR56753E - étançon métallique - Google Patents
étançon métalliqueInfo
- Publication number
- FR56753E FR56753E FR56753DA FR56753E FR 56753 E FR56753 E FR 56753E FR 56753D A FR56753D A FR 56753DA FR 56753 E FR56753 E FR 56753E
- Authority
- FR
- France
- Prior art keywords
- metal prop
- prop
- metal
- 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
- 239000002184 metal Substances 0.000 title 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
- E21D15/16—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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR56753T | 1947-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR56753E true FR56753E (fr) | 1952-10-06 |
Family
ID=8690907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR56753D Expired FR56753E (fr) | 1947-04-11 | 1947-04-11 | étançon métallique |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR56753E (fr) |
-
1947
- 1947-04-11 FR FR56753D patent/FR56753E/fr not_active Expired
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