GB962542A - Improvements in and relating to hydraulic props - Google Patents
Improvements in and relating to hydraulic propsInfo
- Publication number
- GB962542A GB962542A GB2872359A GB2872359A GB962542A GB 962542 A GB962542 A GB 962542A GB 2872359 A GB2872359 A GB 2872359A GB 2872359 A GB2872359 A GB 2872359A GB 962542 A GB962542 A GB 962542A
- Authority
- GB
- United Kingdom
- Prior art keywords
- latch
- piston
- aug
- groove
- pressure
- 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
- 238000005086 pumping Methods 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
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
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)
- Press Drives And Press Lines (AREA)
- Reciprocating Pumps (AREA)
Abstract
962,542. Reciprocating pumps. ACROW (ENGINEERS) Ltd. Aug. 16, 1960 [Aug. 21, 1959], No. 28723/59. Heading F1A. [Also in Division El] An hydraulic pit prop, see Division El, is provided with a differential reciprocating pump comprising low-and high-pressure pistons 24, 22 which are inter-connected together by a latch only when the pumping pressure is low. An adjustable spring-loaded or hydraulically operated latch interlocks a hollow post 38 fixed to the piston 24 and a slide block 36 fixed to the piston rod 22, the latch being disposed in the block 36 and co-operating with a groove 40 on the post, see also Fig. 2 (not shown), to effect locking of said members 22, 24 until the pressure beneath the latter rises to prevent movement of same. The latch may be disposed in a bore in the piston 24 and engage a groove in the member 22 or an extension thereof. Specifications 962,541 and 962,544 are referred to.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2872359A GB962542A (en) | 1959-08-21 | 1959-08-21 | Improvements in and relating to hydraulic props |
DEA35403A DE1152375B (en) | 1959-08-21 | 1960-08-22 | Hydraulic pit ram |
FR836451A FR1265718A (en) | 1959-08-21 | 1960-08-22 | hydraulic mine prop |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2872359A GB962542A (en) | 1959-08-21 | 1959-08-21 | Improvements in and relating to hydraulic props |
Publications (1)
Publication Number | Publication Date |
---|---|
GB962542A true GB962542A (en) | 1964-07-01 |
Family
ID=10280065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2872359A Expired GB962542A (en) | 1959-08-21 | 1959-08-21 | Improvements in and relating to hydraulic props |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1152375B (en) |
GB (1) | GB962542A (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE486663A (en) * | 1948-01-12 | |||
NL191038A (en) * | 1953-09-24 | 1900-01-01 | ||
BE553228A (en) * | 1955-12-08 | |||
BE559146A (en) * | 1956-07-05 |
-
1959
- 1959-08-21 GB GB2872359A patent/GB962542A/en not_active Expired
-
1960
- 1960-08-22 DE DEA35403A patent/DE1152375B/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1152375B (en) | 1963-08-08 |
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