GB706088A - Apparatus for mine roof control - Google Patents
Apparatus for mine roof controlInfo
- Publication number
- GB706088A GB706088A GB26960/52A GB2696052A GB706088A GB 706088 A GB706088 A GB 706088A GB 26960/52 A GB26960/52 A GB 26960/52A GB 2696052 A GB2696052 A GB 2696052A GB 706088 A GB706088 A GB 706088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- jack
- floor
- engaging means
- frames
- abutment
- 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
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/08—Advancing mechanisms
- E21D23/081—Advancing mechanisms forming parts of the roof supports
- E21D23/087—Advancing mechanisms forming parts of the roof supports acting directly on the walls of the seam
- E21D23/088—Advancing mechanisms forming parts of the roof supports acting directly on the walls of the seam by means of wheels, rollers, caterpillars, belts or worm screws
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
706,088. Hydraulic jacks. JOY MANUFACTURING CO. June 18, 1948 [May 1, 1948], No. 26960/52. Divided out of 706,002. Class 78 (3) [Also in Groups X. and XXXI] A mine roof support comprises a forward jack 10 having floor and roof engaging means 11, 12 connected by chains 39 to the floor and roof engaging means of a rearward jack 21 and a double-acting piston and cylinder 28 between the forward jack and an abutment jack 24, adapted to move the jacks 10, 21 forward relative to the abutment jack or vice-versa. Each floor and roof engaging means comprises freely circulating endless tracks on frames 19 which are carried by trunnions on the ends of a cross bar 17 which in the case of the roof engaging means has a universal mounting on the top of the jack. The pressure fluid supplied to the abutment jack passes through the piston rod of the cylinder 28. Downwardly inclined frames 42 are pivoted to extensions at the rear of the frames 19 of the rearward jack and engage the floor by wheels 45 and carry endless tracks.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US706088XA | 1948-05-01 | 1948-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB706088A true GB706088A (en) | 1954-03-24 |
Family
ID=22096344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26960/52A Expired GB706088A (en) | 1948-05-01 | 1948-06-18 | Apparatus for mine roof control |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB706088A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361052A (en) * | 2018-05-02 | 2018-08-03 | 石家庄煤矿机械有限责任公司 | Without the support quick holder of self-loopa repeatedly |
| CN115506829A (en) * | 2022-09-23 | 2022-12-23 | 国家能源集团乌海能源有限责任公司 | Fully-mechanized double-crawler meshing system |
-
1948
- 1948-06-18 GB GB26960/52A patent/GB706088A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361052A (en) * | 2018-05-02 | 2018-08-03 | 石家庄煤矿机械有限责任公司 | Without the support quick holder of self-loopa repeatedly |
| CN115506829A (en) * | 2022-09-23 | 2022-12-23 | 国家能源集团乌海能源有限责任公司 | Fully-mechanized double-crawler meshing system |
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