GB1077240A - Improvements in and relating to hydraulically extendable friction pit props - Google Patents
Improvements in and relating to hydraulically extendable friction pit propsInfo
- Publication number
- GB1077240A GB1077240A GB5181264A GB5181264A GB1077240A GB 1077240 A GB1077240 A GB 1077240A GB 5181264 A GB5181264 A GB 5181264A GB 5181264 A GB5181264 A GB 5181264A GB 1077240 A GB1077240 A GB 1077240A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- unit
- hydraulic
- low
- hydraulically
- 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
- 239000012530 fluid Substances 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
- E21D15/58—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
- E21D15/58—Devices for setting props or chocks
- E21D15/584—Devices for setting props or chocks in which a series of similarly shaped props obtain an almost equal load capacity by removable devices
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)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Clamps And Clips (AREA)
- Machine Tool Units (AREA)
Abstract
1,077,240. Hydraulic pit props; prop setting devices. K. GERLACH and H. GERLACH. Dec. 21, 1964 [March 23, 1964], No. 51812/64. Heading E1E. In an hydraulic pit prop having a friction clamp tightened by a wedge 4 actuated by an hydraulic, servo-unit 8 detachably fixed to the clamp and wherein the unit 8 is controlled by an adjustable, supplementary valve responsive to the setting pressure of the prop in order to permit sequential actuation of the wedge, the unit is characterized by being connectable to a source of low-pressure air 19, a source of highpressure hydraulic fluid 20 and a discharge line 21 by a valve unit 18 which also incorporates the supplementary valve and controls the admission and return therethrough of either or both the low and high pressure media. For details of the control valve assembly and modifications thereof Figs. 4, 5 and 6 (not shown) should be referred to. The arrangement is such that the prop may be set in one stage hydraulically or in two consecutive stages, i.e. pneumatically and then hydraulically. The unit 8 also incorporates a spring-retractable plunger 14 and a line 7 which may be connected to an adjacent prop for low pressure setting thereof.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG40177A DE1194803B (en) | 1964-03-23 | 1964-03-23 | Pit ram with a built-in setting device and a removable hydraulic lock clamping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1077240A true GB1077240A (en) | 1967-07-26 |
Family
ID=7126344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5181264A Expired GB1077240A (en) | 1964-03-23 | 1964-12-21 | Improvements in and relating to hydraulically extendable friction pit props |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1194803B (en) |
| FR (1) | FR1419384A (en) |
| GB (1) | GB1077240A (en) |
| NL (1) | NL6414836A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112727481B (en) * | 2021-02-05 | 2022-11-29 | 中铁工程装备集团有限公司 | Excavation cabin direct discharge slurry shield machine and excavation cabin direct discharge slurry method |
-
1964
- 1964-03-23 DE DEG40177A patent/DE1194803B/en active Pending
- 1964-12-18 NL NL6414836A patent/NL6414836A/xx unknown
- 1964-12-21 GB GB5181264A patent/GB1077240A/en not_active Expired
- 1964-12-31 FR FR644A patent/FR1419384A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL6414836A (en) | 1965-09-24 |
| FR1419384A (en) | 1966-02-18 |
| DE1194803B (en) | 1965-06-16 |
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