BE478763A - - Google Patents
Info
- Publication number
- BE478763A BE478763A BE478763A BE478763A BE478763A BE 478763 A BE478763 A BE 478763A BE 478763 A BE478763 A BE 478763A BE 478763 A BE478763 A BE 478763A BE 478763 A BE478763 A BE 478763A
- Authority
- BE
- Belgium
- Prior art keywords
- wedge
- strut
- prop
- metal mine
- retractable metal
- Prior art date
Links
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 238000010276 construction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 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
- E21D15/285—Telescopic props with parts held relatively to each other by friction or gripping by means of wedges or wedge combinations
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)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL128634A NL69243C (xx) | 1946-11-07 | 1946-11-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE478763A true BE478763A (xx) | 1948-01-31 |
Family
ID=1821563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE478763A BE478763A (xx) | 1946-11-07 | 1947-12-27 |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE478763A (xx) |
FR (1) | FR958808A (xx) |
NL (1) | NL69243C (xx) |
-
1946
- 1946-11-07 NL NL128634A patent/NL69243C/nl active
-
1947
- 1947-12-27 BE BE478763A patent/BE478763A/nl unknown
- 1947-12-30 FR FR958808D patent/FR958808A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL69243C (xx) | 1951-12-16 |
FR958808A (xx) | 1950-03-21 |
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