GB708063A - Improvements in or relating to pit props and like supports - Google Patents
Improvements in or relating to pit props and like supportsInfo
- Publication number
- GB708063A GB708063A GB2854450A GB2854450A GB708063A GB 708063 A GB708063 A GB 708063A GB 2854450 A GB2854450 A GB 2854450A GB 2854450 A GB2854450 A GB 2854450A GB 708063 A GB708063 A GB 708063A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pit
- relating
- supports
- nov
- pad
- 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
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
- E21D15/50—Component parts or details of props
- E21D15/52—Extensible units located above or below standard props
- E21D15/523—Extensible units located above or below standard props with hydraulic or pneumatic control
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)
- Pens And Brushes (AREA)
- Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
- Accommodation For Nursing Or Treatment Tables (AREA)
Abstract
708,063. Hydraulic jacks. LAKE & ELLIOT, Ltd., GILBERT, G., and NEWMAN, J. Nov. 20, 1951 [Nov. 22, 1950], No. 28544/50. Class 78 (3) [Also in Group X] An hydraulic unit for a pit-prop comprises a socket 4 in which is slidatble a pad 8 seating on top of the pit-prop 1, and a ram 6 engaging the pad, against which it is adapted to be forced when the pressure of the fluid in the ram chamber 17 is increased by a screw plunger 25 and the head 3 is forced against the mine roof.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2854450A GB708063A (en) | 1950-11-22 | 1950-11-22 | Improvements in or relating to pit props and like supports |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2854450A GB708063A (en) | 1950-11-22 | 1950-11-22 | Improvements in or relating to pit props and like supports |
Publications (1)
Publication Number | Publication Date |
---|---|
GB708063A true GB708063A (en) | 1954-04-28 |
Family
ID=10277302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2854450A Expired GB708063A (en) | 1950-11-22 | 1950-11-22 | Improvements in or relating to pit props and like supports |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB708063A (en) |
-
1950
- 1950-11-22 GB GB2854450A patent/GB708063A/en not_active Expired
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