Classifications

• • 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
  • E21D15/512—Arrangement of valves
• • 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
  • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
• • 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
  • E21D15/60—Devices for withdrawing props or chocks
  • E21D15/606—Devices for withdrawing props or chocks the props being moved systematically
• • 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
• • 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
  • E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms
• • 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

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)
• Mechanical Engineering (AREA)
• Structural Engineering (AREA)
• Actuator (AREA)
• Fluid-Driven Valves (AREA)
• Press Drives And Press Lines (AREA)
• Fluid-Pressure Circuits (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9737370

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (1)

• 1964
  • 1964-01-18 GB GB2314/64A patent/GB1086002A/en not_active Expired
• 1965
  • 1965-01-13 US US425123A patent/US3295814A/en not_active Expired - Lifetime
  • 1965-01-14 DE DED46241A patent/DE1226513B/de active Pending
  • 1965-01-15 BE BE658328D patent/BE658328A/xx unknown
  • 1965-01-18 FR FR2374A patent/FR1421076A/fr not_active Expired

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