GB846392A - Improvements in or relating to props, more especially pit props - Google Patents
Improvements in or relating to props, more especially pit propsInfo
- Publication number
- GB846392A GB846392A GB39370/56A GB3937056A GB846392A GB 846392 A GB846392 A GB 846392A GB 39370/56 A GB39370/56 A GB 39370/56A GB 3937056 A GB3937056 A GB 3937056A GB 846392 A GB846392 A GB 846392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- liquid
- props
- reservoir
- compressed air
- 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
- 239000007788 liquid Substances 0.000 abstract 6
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
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)
- Reciprocating Pumps (AREA)
- Prostheses (AREA)
Abstract
846,392. Pit props. EGGEMANN, W., and CAMPENHAUSEN, von E. [trading as SCHWARZ KOMM.-GES., H.]. Dec. 27, 1956 [Dec. 30, 1955; Oct. 29, 1956], No. 39370/56. Class 20(2) The telescoping parts 10, 11 of a pit prop are adapted to be locked together by a frictional clamp 12 after the prop has been extended by liquid under pressure in a cylinder 14 fixed in the part 11, which acts on a piston 21 having a rod 22 supported in an universal joint 24 in the part 10. The rod 22 is hollow and provides the communication between the cylinder 14 and the source of liquid under pressure. Liquid is forced into the prop from a reservoir 37 by compressed air to engage the prop with the mine roof and is then set at high pressure by a pump 41 which draws liquid from the reservoir 37 through a changeover valve 43. The friction clamp 12 is tightened to hold the prop in this position and the liquid is removed from the prop by operating the valve 43 by compressed air so that the pump 41 returns liquid from the prop to the reservoir. The compressed air for these operations is controlled by a valve 29.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE846392X | 1955-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB846392A true GB846392A (en) | 1960-08-31 |
Family
ID=6775043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39370/56A Expired GB846392A (en) | 1955-12-30 | 1956-12-27 | Improvements in or relating to props, more especially pit props |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB846392A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3137739A4 (en) * | 2014-04-28 | 2017-10-18 | Cougar Can Company Pty Ltd | A telescopic pumpable prop assembly with improved ceiling impact properties |
-
1956
- 1956-12-27 GB GB39370/56A patent/GB846392A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3137739A4 (en) * | 2014-04-28 | 2017-10-18 | Cougar Can Company Pty Ltd | A telescopic pumpable prop assembly with improved ceiling impact properties |
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