GB573160A - Improvements in or connected with lifting jacks and pit props of jack type - Google Patents
Improvements in or connected with lifting jacks and pit props of jack typeInfo
- Publication number
- GB573160A GB573160A GB1239543A GB1239543A GB573160A GB 573160 A GB573160 A GB 573160A GB 1239543 A GB1239543 A GB 1239543A GB 1239543 A GB1239543 A GB 1239543A GB 573160 A GB573160 A GB 573160A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pawl
- carrier
- pit
- load
- cylinder
- 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
- 230000000717 retained effect Effects 0.000 abstract 2
- 239000011435 rock Substances 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F1/00—Devices, e.g. jacks, for lifting loads in predetermined steps
- B66F1/02—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
- B66F1/04—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed
- B66F1/06—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed and the devices being actuated mechanically
-
- 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
- E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
- E21D15/20—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals
-
- 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
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/517—Extension elements
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
573,160. Pit-props. MAVOR & COULSON, Ltd., and MAVOR, J. B. July 30, 1943, No. 12395. [Class 20 (ii)] [Also in Group XXX] A pit-prop or jack employs fluid-pressure for rapid adjustment, with pawl and ratchet mechanism for sustaining the load when fluidpressure is withdrawn, means being provided to permit release of the pawl while subject to load. The pit-prop &c. may have a foot, with cylinder B in which works a piston C having a rod D with ratchet-teeth E, the upper part of the rod being fitted with an adjustable screw-head G carrying a freely rotatable pad F. A casing H on the cylinder has a pawl-carrier 4 pivoted at 5, the pawl 6 being pivoted in the carrier and urged to engage the ratchet-teeth E by a spring- plunger 7. The pawl-carrier is retained in operative position by a crank 10 in dead-centre position engaging a roller 11 on the pawlcarrier, the crank shaft having an arm 13 outside the casing H. The pad F is moved into contact with the mine-roof &c. by air pressure applied at A to the cylinder B and is retained by the pawl 6, load being applied by rotation of the screwed head G by a tommy bar. For removal, the .crank arm 13 is struck, thereby releasing the carrier 4 which rocks about its pivot 5 and releases the pawl from the ratchetteeth E. Specifications 329,466, [Class 68 (i)], and 554,451, [Group XXX], are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1239543A GB573160A (en) | 1943-07-30 | 1943-07-30 | Improvements in or connected with lifting jacks and pit props of jack type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1239543A GB573160A (en) | 1943-07-30 | 1943-07-30 | Improvements in or connected with lifting jacks and pit props of jack type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB573160A true GB573160A (en) | 1945-11-08 |
Family
ID=10003786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1239543A Expired GB573160A (en) | 1943-07-30 | 1943-07-30 | Improvements in or connected with lifting jacks and pit props of jack type |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB573160A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2357806A (en) * | 1999-12-02 | 2001-07-04 | Trevor John Honour | Load bearing props |
| WO2016008206A1 (en) * | 2014-07-12 | 2016-01-21 | 朱林学 | One-way retracting energy-absorbing support |
| CN113863969A (en) * | 2021-10-11 | 2021-12-31 | 煤炭科学研究总院 | Support column with self-locking structure |
-
1943
- 1943-07-30 GB GB1239543A patent/GB573160A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2357806A (en) * | 1999-12-02 | 2001-07-04 | Trevor John Honour | Load bearing props |
| WO2016008206A1 (en) * | 2014-07-12 | 2016-01-21 | 朱林学 | One-way retracting energy-absorbing support |
| CN113863969A (en) * | 2021-10-11 | 2021-12-31 | 煤炭科学研究总院 | Support column with self-locking structure |
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