GB326946A - Metal adjustable safety pit prop - Google Patents
Metal adjustable safety pit propInfo
- Publication number
- GB326946A GB326946A GB3958/29A GB395829A GB326946A GB 326946 A GB326946 A GB 326946A GB 3958/29 A GB3958/29 A GB 3958/29A GB 395829 A GB395829 A GB 395829A GB 326946 A GB326946 A GB 326946A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hollow
- adjustable safety
- pit prop
- metal adjustable
- apertures
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/58—Devices for setting props or chocks
- E21D15/581—Devices for setting props or chocks in which the props are pre- loaded
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G25/00—Shores or struts; Chocks
- E04G25/04—Shores or struts; Chocks telescopic
- E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
- E04G25/066—Shores or struts; Chocks telescopic with parts held together by positive means by a wedge
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D15/20—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals
Abstract
326,946. Frodingham Iron & Steel Co., Ltd., and Johnson, G. H. Feb. 6. 1929. Mine props.-A telescopic prop in which the members are held in adjusted position by means of a transverse wedge has one member a of H- section girder and the other b of hollow H-section, i.e. with hollow flanges and web adapted to enclose the other member. The wedge d passes through apertures c provided in the member b or may pass through apertures which register in both members. The hollow member is provided with a cap f while the foot of the lower member is inturned at h to strengthen it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3958/29A GB326946A (en) | 1929-02-06 | 1929-02-06 | Metal adjustable safety pit prop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3958/29A GB326946A (en) | 1929-02-06 | 1929-02-06 | Metal adjustable safety pit prop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB326946A true GB326946A (en) | 1930-03-27 |
Family
ID=9768085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3958/29A Expired GB326946A (en) | 1929-02-06 | 1929-02-06 | Metal adjustable safety pit prop |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB326946A (en) |
-
1929
- 1929-02-06 GB GB3958/29A patent/GB326946A/en not_active Expired
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