PL77790B1 - - Google Patents
Download PDFInfo
- Publication number
- PL77790B1 PL77790B1 PL1971149969A PL14996971A PL77790B1 PL 77790 B1 PL77790 B1 PL 77790B1 PL 1971149969 A PL1971149969 A PL 1971149969A PL 14996971 A PL14996971 A PL 14996971A PL 77790 B1 PL77790 B1 PL 77790B1
- Authority
- PL
- Poland
- Prior art keywords
- canopy
- spring arms
- spring
- cylinder
- arms
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 7
- 230000000452 restraining effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000010355 oscillation Effects 0.000 claims 1
- 230000007306 turnover Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 description 8
- 230000000712 assembly Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 241000282994 Cervidae Species 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 241000275031 Nica Species 0.000 description 1
- 108010001267 Protein Subunits Proteins 0.000 description 1
- 241000287531 Psittacidae Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 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
- E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
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)
- Body Structure For Vehicles (AREA)
- Actuator (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702040179 DE2040179C (de) | 1970-08-13 | Hydraulisch betätigte Vorrichtung zum seitlichen Rückstellen der Kappen von in zwei Schritten vorrückenden Wanderausbauaggregaten für steile Lagerung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL77790B1 true PL77790B1 (cs) | 1975-04-30 |
Family
ID=5779589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL1971149969A PL77790B1 (cs) | 1970-08-13 | 1971-08-11 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3800545A (cs) |
| AU (1) | AU464341B2 (cs) |
| GB (1) | GB1349657A (cs) |
| PL (1) | PL77790B1 (cs) |
| RO (1) | RO61311A (cs) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3141040C1 (de) * | 1981-10-15 | 1983-03-31 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal | Hydraulisches Ausbaugestell |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3490243A (en) * | 1966-11-16 | 1970-01-20 | Karl Maria Groetschel | Roof supports for mine workings |
| BE727824A (cs) * | 1968-03-12 | 1969-07-16 | ||
| GB1287096A (en) * | 1968-10-17 | 1972-08-31 | Karl Maria Groetschel | Improvements relating to advancing roof supports for mine workings |
-
1971
- 1971-08-10 AU AU32201/71A patent/AU464341B2/en not_active Expired
- 1971-08-11 PL PL1971149969A patent/PL77790B1/pl unknown
- 1971-08-12 RO RO67959A patent/RO61311A/ro unknown
- 1971-08-13 GB GB3805271A patent/GB1349657A/en not_active Expired
- 1971-08-13 US US00171703A patent/US3800545A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB1349657A (en) | 1974-04-10 |
| AU3220171A (en) | 1973-02-15 |
| AU464341B2 (en) | 1975-08-21 |
| RO61311A (cs) | 1976-12-15 |
| DE2040179B1 (de) | 1971-08-05 |
| US3800545A (en) | 1974-04-02 |
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