GB507921A - Improvements in devices for pulling down pit props - Google Patents
Improvements in devices for pulling down pit propsInfo
- Publication number
- GB507921A GB507921A GB35535/37A GB3553537A GB507921A GB 507921 A GB507921 A GB 507921A GB 35535/37 A GB35535/37 A GB 35535/37A GB 3553537 A GB3553537 A GB 3553537A GB 507921 A GB507921 A GB 507921A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stirrup
- prop
- props
- collapsing
- pit
- 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
- 238000007689 inspection Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 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
- E21D15/60—Devices for withdrawing props or chocks
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)
- Emergency Lowering Means (AREA)
Abstract
507,921. Collapsing pit-props. MOLL, F. W. Dec. 22, 1937, No. 35535. Convention date, Nov. 15. Addition to 504,955. [Class 78 (iii)] [Also in Group X] In a modification of the invention of the parent Specification describing a method of collapsing a row of pit-props in succession wherein a wedge drawn forward by a draw rope acts on a guide secured to one member of a multipart prop so as to collapse it, the guide is foraned as a stirrup 24 secured to a metal prop part 1 whose inclined foot rests on a plate 16 supported on a wooden prop part 12 and the draw rope s carrying the wedge is guided in the aperture d of the stirrup. The stirrup is rigidly fixed to the part 1 and plate 16. The Specification as open to inspection under Sect. 91 also described an arrangement in which the stirrup is pivoted to the prop part by a link. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE507921X | 1937-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB507921A true GB507921A (en) | 1939-06-22 |
Family
ID=6546864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35535/37A Expired GB507921A (en) | 1937-11-15 | 1937-12-22 | Improvements in devices for pulling down pit props |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB507921A (en) |
-
1937
- 1937-12-22 GB GB35535/37A patent/GB507921A/en not_active Expired
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