GB684284A - Improvements in metallic pit props - Google Patents
Improvements in metallic pit propsInfo
- Publication number
- GB684284A GB684284A GB27858/50A GB2785850A GB684284A GB 684284 A GB684284 A GB 684284A GB 27858/50 A GB27858/50 A GB 27858/50A GB 2785850 A GB2785850 A GB 2785850A GB 684284 A GB684284 A GB 684284A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wedge
- prop
- collar
- plunger
- supported
- 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
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 238000010276 construction Methods 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
- E21D15/285—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)
- Mutual Connection Of Rods And Tubes (AREA)
- Clamps And Clips (AREA)
Abstract
684,284. Pit props. GERLACH, H. Nov. 14, 1950 [Nov. 14, 1949]. No. 27858/ 50. Class 20 (ii). A metallic telescopic pit prop comprises a vertical friction wedge 4 adapted to be carried down with the inner prop member 1 under mine roof pressure and supported on the prop lock collar 3 by an intermediate member 6 which is supported by an abutment 9 rockable on a curved surface and the locking and releasing wedge 5, bearing on a curved surface. A stirrup 4a embracing the member 1, on engaging the wedge 4 assumes an oblique position which causes it to grip the member 1 and assist the downward movement of the wedge. A spring plunger 10 in the member 6 returns the wedge 4 to initial position determined by a stop 12 on the wedge engaging the outer prop member 2. A friction lining 14 is arranged between a wedge 4 and the inner member 1. In a modification, the wedge 5 is rounded on both edges so as to pivot during the collapsing of the prop and the lock collar 3 is constructed as a stirrup inside which the abutment 9 is arranged. Further modifications show various constructions of the collar 3. In Fig. 7 the member 6 is supported by a member 18 rockable in a bearing 19 in the collar 3 and engaged by the wedge 5. The plunger 10 is arranged underneath the collar 3. An insert 20, having curved surfaces, may be arranged between the prop members opposite the friction lining 14 and may be riveted in position. The plunger 10, Fig. 1, may be replaced by a plunger having a collar which limits the downward travel of the wedge 4. Specification 670,287 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE684284X | 1949-11-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB684284A true GB684284A (en) | 1952-12-17 |
Family
ID=6597566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27858/50A Expired GB684284A (en) | 1949-11-14 | 1950-11-14 | Improvements in metallic pit props |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB684284A (en) |
-
1950
- 1950-11-14 GB GB27858/50A patent/GB684284A/en not_active Expired
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