CA963453A - Rapidly-retractable hydraulic prop - Google Patents

Rapidly-retractable hydraulic prop

Info

Publication number
CA963453A
CA963453A CA152,706A CA152706A CA963453A CA 963453 A CA963453 A CA 963453A CA 152706 A CA152706 A CA 152706A CA 963453 A CA963453 A CA 963453A
Authority
CA
Canada
Prior art keywords
rapidly
hydraulic prop
retractable hydraulic
retractable
prop
Prior art date
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
Application number
CA152,706A
Other versions
CA152706S (en
Inventor
Hans Bull
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hemscheidt Hermann Maschinenfabrik GmbH and Co
Original Assignee
Hemscheidt Hermann Maschinenfabrik GmbH and Co
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 Hermann Maschinenfabrik GmbH and Co filed Critical Hemscheidt Hermann Maschinenfabrik GmbH and Co
Application granted granted Critical
Publication of CA963453A publication Critical patent/CA963453A/en
Expired legal-status Critical Current

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)
CA152,706A 1971-10-04 1972-09-27 Rapidly-retractable hydraulic prop Expired CA963453A (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
CA963453A true CA963453A (en) 1975-02-25

Family

ID=5821410

Family Applications (1)

Application Number Title Priority Date Filing Date
CA152,706A Expired CA963453A (en) 1971-10-04 1972-09-27 Rapidly-retractable hydraulic prop

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
US6679413B2 (en) 2001-02-08 2004-01-20 Black & Decker Inc. Magazine assembly for fastening tool
US6648202B2 (en) 2001-02-08 2003-11-18 Black & Decker Inc. Pneumatic 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
ZA726547B (en) 1973-06-27
US3777619A (en) 1973-12-11
DE2149451C2 (en) 1974-09-19
PL77333B1 (en) 1975-04-30
DE2149451B1 (en) 1972-10-05

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