GB809056A - Improvements in or relating to telescopic pit-props - Google Patents
Improvements in or relating to telescopic pit-propsInfo
- Publication number
- GB809056A GB809056A GB8154/57A GB815457A GB809056A GB 809056 A GB809056 A GB 809056A GB 8154/57 A GB8154/57 A GB 8154/57A GB 815457 A GB815457 A GB 815457A GB 809056 A GB809056 A GB 809056A
- Authority
- GB
- United Kingdom
- Prior art keywords
- clamp
- props
- prop
- pit
- relating
- 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 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
- E21D15/32—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring
- E21D15/325—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring by a clamping ring
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)
- Clamps And Clips (AREA)
Abstract
809,056. Pit props. GERLACH, K., and GERLACH, H. March 12, 1957 [March 19, 1956], No. 8154/57. Class 20(2) The clamp 4 of a telescopic pit prop has overlapping lugs 8, 9 alternating with one another and engaging the prop inner member 3 to bridge the gap in the clamp. The clamp 4 may be divided into two parts horizontally by a slat so that the upper part is carried down slightly as the prop telescopes and increases the clamping effect. Metal is die-pressed in flat form then bent to form the clamp.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE809056X | 1956-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB809056A true GB809056A (en) | 1959-02-18 |
Family
ID=6723225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8154/57A Expired GB809056A (en) | 1956-03-19 | 1957-03-12 | Improvements in or relating to telescopic pit-props |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB809056A (en) |
-
1957
- 1957-03-12 GB GB8154/57A patent/GB809056A/en not_active Expired
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