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 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 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
  • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
  • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
  • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
  • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side

Applications Claiming Priority (1)

Publications (1)

Family

ID=7150844

Family Applications (1)

Country Status (5)

Family Cites Families (2)

• 0
  • NL NL218917D patent/NL218917A/xx unknown
  • BE BE559917D patent/BE559917A/xx unknown
• 1956
  • 1956-10-16 DE DEH28351A patent/DE1128383B/en active Pending
• 1957
  • 1957-07-02 FR FR1177675D patent/FR1177675A/en not_active Expired
  • 1957-09-02 GB GB2764257A patent/GB836471A/en not_active Expired

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