FR2175735B1 - - Google Patents
Info
- Publication number
- FR2175735B1 FR2175735B1 FR7246880A FR7246880A FR2175735B1 FR 2175735 B1 FR2175735 B1 FR 2175735B1 FR 7246880 A FR7246880 A FR 7246880A FR 7246880 A FR7246880 A FR 7246880A FR 2175735 B1 FR2175735 B1 FR 2175735B1
- Authority
- FR
- France
- 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 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
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/26—Hydraulic or pneumatic control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
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)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Chain Conveyers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2212686A DE2212686C3 (de) | 1972-03-16 | 1972-03-16 | Gruppenfolgesteuerung zum automatischen Rücken einer Ausbaugruppe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2175735A1 FR2175735A1 (US20060016700A1-20060126-C00001.png) | 1973-10-26 |
| FR2175735B1 true FR2175735B1 (US20060016700A1-20060126-C00001.png) | 1976-08-27 |
Family
ID=5839079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7246880A Expired FR2175735B1 (US20060016700A1-20060126-C00001.png) | 1972-03-16 | 1972-12-29 |
Country Status (5)
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159671A (en) * | 1974-08-20 | 1979-07-03 | Allen Archelaius D | Self-advancing mine roof supports |
| GB1531246A (en) * | 1975-07-29 | 1978-11-08 | Gullick Dobson Ltd | Mine roof support control systems |
| DE2700829C2 (de) * | 1977-01-11 | 1986-04-17 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Hydraulische Ausbausteuerung |
| JPS53114704A (en) * | 1977-02-28 | 1978-10-06 | Taiheiyo Eng | Operating device of selfftravelling frame* etc* |
| DE2851937C2 (de) * | 1978-12-01 | 1986-05-28 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Steuerventil, insbesondere für einen hydraulischen Schreitausbau in Bergbaubetrieben |
| GB2095425B (en) * | 1981-02-25 | 1984-06-27 | Dobson Park Ind | Mine roof support control systems |
| DE3111875A1 (de) * | 1981-03-26 | 1982-10-14 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Elektrohydraulische ausbausteuerung fuer untertaegige gewinnungsbetriebe |
| GB2142074B (en) * | 1983-06-21 | 1987-04-23 | Dobson Park Ind | Control of mine roof supports |
| DE3404302C1 (de) * | 1984-02-08 | 1985-06-05 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal | Steuervorrichtung fuer ein hydraulisches Schreitausbaugestell |
| DE3801593A1 (de) * | 1988-01-21 | 1989-08-03 | Hemscheidt Maschf Hermann | Gruppensteuerung fuer hydraulischen schreitausbau |
| DE3824522A1 (de) * | 1988-07-20 | 1990-01-25 | Kloeckner Becorit Gmbh | Verfahren zum ruecken eines strebausbaues |
| US5428959A (en) * | 1994-08-01 | 1995-07-04 | Illinois Tool Works Inc. | Pneumatic control circuit |
| CN112524109A (zh) * | 2020-12-02 | 2021-03-19 | 辽宁工程技术大学 | 一种液压支架四点起吊平衡的方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2548198A (en) * | 1945-11-15 | 1951-04-10 | Charles H Cosnett | Dual control for the throttle and reversing means of pressure fluid engines |
| US2540710A (en) * | 1947-08-21 | 1951-02-06 | Westinghouse Air Brake Co | Fluid pressure control apparatus |
| US2940428A (en) * | 1954-08-10 | 1960-06-14 | Bendix Aviat Corp | Parallel hydraulic control system |
| GB961225A (en) * | 1961-06-12 | 1964-06-17 | Electro Hydraulics Ltd | Hydraulically operated advancing roof support systems |
| GB959492A (en) * | 1961-11-21 | 1964-06-03 | Dowty Technical Developements | Mining apparatus |
| GB1023827A (en) * | 1963-06-21 | 1966-03-23 | Dowty Mining Equipment Ltd | Roof support assembly |
| DE1249796B (US20060016700A1-20060126-C00001.png) * | 1963-09-06 | 1967-09-14 |
-
0
- BE BE794193D patent/BE794193A/xx not_active IP Right Cessation
-
1972
- 1972-03-16 DE DE2212686A patent/DE2212686C3/de not_active Expired
- 1972-12-29 FR FR7246880A patent/FR2175735B1/fr not_active Expired
-
1973
- 1973-03-14 US US341012A patent/US3906738A/en not_active Expired - Lifetime
- 1973-03-15 GB GB1261473A patent/GB1420862A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2175735A1 (US20060016700A1-20060126-C00001.png) | 1973-10-26 |
| US3906738A (en) | 1975-09-23 |
| DE2212686C3 (de) | 1979-03-22 |
| GB1420862A (en) | 1976-01-14 |
| BE794193A (fr) | 1973-05-16 |
| DE2212686A1 (de) | 1973-09-20 |
| DE2212686B2 (de) | 1978-07-20 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |