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
  • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
  • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
  • B66F3/25—Constructional features
  • B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
• • 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
  • E21D15/50—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
• • 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
  • E21D15/58—Devices for setting props or chocks
  • E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
  • E21D15/586—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded

Landscapes

• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Mechanical Engineering (AREA)
• Structural Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9662322

Family Applications (1)

Country Status (2)

Cited By (1)

• 0
  • BE BE572421D patent/BE572421A/xx unknown
• 1957
  • 1957-08-29 FR FR1181864D patent/FR1181864A/fr not_active Expired

Also Published As

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