ZA726547B - Hydraulic pit props - Google Patents

Hydraulic pit props

Info

Publication number
ZA726547B
ZA726547B ZA726547A ZA726547A ZA726547B ZA 726547 B ZA726547 B ZA 726547B ZA 726547 A ZA726547 A ZA 726547A ZA 726547 A ZA726547 A ZA 726547A ZA 726547 B ZA726547 B ZA 726547B
Authority
ZA
South Africa
Prior art keywords
pit props
hydraulic pit
hydraulic
props
pit
Prior art date
Application number
ZA726547A
Inventor
H Buell
Original Assignee
Hemscheidt Maschf Hermann
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hemscheidt Maschf Hermann filed Critical Hemscheidt Maschf Hermann
Publication of ZA726547B publication Critical patent/ZA726547B/en

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Safety Valves (AREA)
ZA726547A 1971-10-04 1972-09-25 Hydraulic pit props ZA726547B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2149451A DE2149451C2 (en) 1971-10-04 1971-10-04 Rock impact valve arrangement for a hydraulic pit ram

Publications (1)

Publication Number Publication Date
ZA726547B true ZA726547B (en) 1973-06-27

Family

ID=5821410

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA726547A ZA726547B (en) 1971-10-04 1972-09-25 Hydraulic pit props

Country Status (5)

Country Link
US (1) US3777619A (en)
CA (1) CA963453A (en)
DE (1) DE2149451C2 (en)
PL (1) PL77333B1 (en)
ZA (1) ZA726547B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2603978C3 (en) * 1976-02-03 1982-10-14 Thyssen Industrie Ag, 4300 Essen Rock impact valve arrangement in a hydraulic pit ram
DE3340888C1 (en) * 1983-11-11 1985-02-07 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Hydraulic prop with rock-burst valve for a self-advancing powered support assembly
WO1991000416A1 (en) * 1989-06-27 1991-01-10 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Hydraulic stand
DE4035874A1 (en) * 1990-06-29 1992-01-02 Voss Richard Grubenausbau Underground-mine walling ram - has head forming safety-valve-spring housing with outlet in wall or top
US6648202B2 (en) 2001-02-08 2003-11-18 Black & Decker Inc. Pneumatic fastening tool
US6679413B2 (en) * 2001-02-08 2004-01-20 Black & Decker Inc. Magazine assembly for fastening tool
US6609646B2 (en) 2001-02-08 2003-08-26 Black & Decker Inc. Magazine assembly for fastening tool

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962543A (en) * 1959-08-21 1964-07-01 Acrow Eng Ltd Improvements in and relating to hydraulic props
GB1080831A (en) * 1964-01-17 1967-08-23 Soc Anglo Belge Vulcain Sa Nuclear reactor control mechanism

Also Published As

Publication number Publication date
US3777619A (en) 1973-12-11
PL77333B1 (en) 1975-04-30
DE2149451B1 (en) 1972-10-05
CA963453A (en) 1975-02-25
DE2149451C2 (en) 1974-09-19

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