GB737045A - Improvements in or relating to manually-operated hydraulic jacks - Google Patents
Improvements in or relating to manually-operated hydraulic jacksInfo
- Publication number
- GB737045A GB737045A GB1890553A GB1890553A GB737045A GB 737045 A GB737045 A GB 737045A GB 1890553 A GB1890553 A GB 1890553A GB 1890553 A GB1890553 A GB 1890553A GB 737045 A GB737045 A GB 737045A
- Authority
- GB
- United Kingdom
- Prior art keywords
- handle
- chamber
- reservoir
- piston
- valve
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/60—Devices for withdrawing props or chocks
- E21D15/603—Devices for withdrawing props or chocks by means of hydraulic devices
Abstract
737,045. Hydraulic jacks. WILD & CO., Ltd., A. G. April 15, 1954 [July 8, 1953], No. 18905/53. Class 78 (3). In a hydraulic jack for withdrawing pit props or tensioning chains of coal cutters or conveyers as described in Specification 735,288 comprising a pump 20 supplying liquid from a reservoir 18 to a pressure chamber 10 thereby retracting a piston 14, the jack is filled with compressed air or gas to assist return movement of the piston when the pressure in chamber 10 is released. Reciprocation of plunger 20 by a handle 34 withdraws liquid from reservoir 18 through valve 24 and forces it through valve 28 and passages 28<SP>1</SP>, 29 and 30 to chamber 10. The piston may be held in any position of adjustment by engaging the end of the handle in a recess 36 in the cylinder head 12. Lowering of the handle to engage a second recess 37 depresses a plunger 41 which opens a valve 45 permitting liquid to return from chamber 10 to the reservoir. Upward movement of the handle is limited by engagement of a pin 6 with an abutment 61.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1890553A GB737045A (en) | 1953-07-08 | 1953-07-08 | Improvements in or relating to manually-operated hydraulic jacks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1890553A GB737045A (en) | 1953-07-08 | 1953-07-08 | Improvements in or relating to manually-operated hydraulic jacks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB737045A true GB737045A (en) | 1955-09-21 |
Family
ID=10120432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1890553A Expired GB737045A (en) | 1953-07-08 | 1953-07-08 | Improvements in or relating to manually-operated hydraulic jacks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB737045A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318797A (en) * | 2019-07-12 | 2019-10-11 | 湖南三五二环保科技有限公司 | A kind of coal working face withdraws device and its application method |
-
1953
- 1953-07-08 GB GB1890553A patent/GB737045A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318797A (en) * | 2019-07-12 | 2019-10-11 | 湖南三五二环保科技有限公司 | A kind of coal working face withdraws device and its application method |
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