GB851766A - An improved hydraulic pit prop - Google Patents
An improved hydraulic pit propInfo
- Publication number
- GB851766A GB851766A GB13872/58A GB1387258A GB851766A GB 851766 A GB851766 A GB 851766A GB 13872/58 A GB13872/58 A GB 13872/58A GB 1387258 A GB1387258 A GB 1387258A GB 851766 A GB851766 A GB 851766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bladder
- prop
- lock
- gerlach
- pipe
- 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
- 230000008602 contraction Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 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
- E21D15/58—Devices for setting props or chocks
- E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
- E21D15/586—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded
- E21D15/588—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded the lock also being activated
-
- 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
- E21D15/30—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber
- E21D15/306—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber by means of a liquid
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)
- Jib Cranes (AREA)
- Actuator (AREA)
Abstract
851,766. Mine roof supports. GERLACH, K., and GERLACH, H, May 1, 1958 [May 2, 1957], No. 13872/58. Class 20(2) The hydraulic friction lock 5 of a telescopic pit prop comprising tubes 1, 6 is operated by fluid via a pipe 7 from a bladder 30 mounted in the prop head which is compressed by the weight of the mine roof. The prop is first extended by introducing compressed air into the outer tube 6 at an orifice 16. Final setting of the lock 5 is achieved by an external key 15 which turns gears to force a piston 10 to collapse a bladder chamber 8 in communication with the pipe 7. An externally operable screw in the bladder 30 may replace the chamber 8. The bladder 30 is encircled by rubber bands 31 which facilitate its contraction. The bladder 20 of the lock 5 may be contained in two oppositely facing metal buckets each comprising a floor section having radial extensions with scarfed edges which are bent up to surround the bladder (Fig. 9, not shown, refers).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE851766X | 1957-05-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB851766A true GB851766A (en) | 1960-10-19 |
Family
ID=6782230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13872/58A Expired GB851766A (en) | 1957-05-02 | 1958-05-01 | An improved hydraulic pit prop |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB851766A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3220686A (en) * | 1962-10-19 | 1965-11-30 | Guardian Mining Props Ltd | Telescopic pit prop |
-
1958
- 1958-05-01 GB GB13872/58A patent/GB851766A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3220686A (en) * | 1962-10-19 | 1965-11-30 | Guardian Mining Props Ltd | Telescopic pit prop |
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