GB971450A - Improvements in and relating to telescopic hydraulic supports - Google Patents
Improvements in and relating to telescopic hydraulic supportsInfo
- Publication number
- GB971450A GB971450A GB2315863A GB2315863A GB971450A GB 971450 A GB971450 A GB 971450A GB 2315863 A GB2315863 A GB 2315863A GB 2315863 A GB2315863 A GB 2315863A GB 971450 A GB971450 A GB 971450A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- valve
- piston rod
- fluid
- spring
- 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 2
- 238000005065 mining 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
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
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)
- Actuator (AREA)
Abstract
971,450. Hydraulic pit props. MASTABAR MINING EQUIPMENT CO. Ltd. June 11, 1963, No. 23158/63. Heading E1E. In an hydraulic pit prop having a two-stage pump 32, 36 and a setting valve 42, 44, 52, the member 42 has a restricted clearance therearound as shown whereby the valve bore 40 is filled with trapped fluid when the valve is first put into service. The valving arrangement is such that when the members 42, 44 are abruptly lifted against the action of a spring 40 due to the build up of pressure in the chamber 18, a back pressure impulse is set up to assist the return spring to move the ball valve 42 against its seating 52 whereby a distinct click is communicated to the operator and also felt through the pump operating handle connected to the pump piston rod 38. Excessive movement of the pump handle depresses the piston rod 38 to operate a release valve 53, 54 and then to separate the ram parts 20, 24 to permit a free return of fluid to the pump reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2315863A GB971450A (en) | 1963-06-11 | 1963-06-11 | Improvements in and relating to telescopic hydraulic supports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2315863A GB971450A (en) | 1963-06-11 | 1963-06-11 | Improvements in and relating to telescopic hydraulic supports |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB971450A true GB971450A (en) | 1964-09-30 |
Family
ID=10191100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2315863A Expired GB971450A (en) | 1963-06-11 | 1963-06-11 | Improvements in and relating to telescopic hydraulic supports |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB971450A (en) |
-
1963
- 1963-06-11 GB GB2315863A patent/GB971450A/en not_active Expired
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