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FR551763A - flexible two-piece mine prop that fits together - Google Patents

flexible two-piece mine prop that fits together

Info

Publication number
FR551763A
FR551763A FR551763DA FR551763A FR 551763 A FR551763 A FR 551763A FR 551763D A FR551763D A FR 551763DA FR 551763 A FR551763 A FR 551763A
Authority
FR
France
Prior art keywords
flexible
fits together
mine prop
piece
piece mine
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
Other languages
French (fr)
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.)
ERNEST HECKEL SOC
Original Assignee
ERNEST HECKEL SOC
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 ERNEST HECKEL SOC filed Critical ERNEST HECKEL SOC
Application granted granted Critical
Publication of FR551763A publication Critical patent/FR551763A/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
    • E21D15/14—Telescopic props
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/38—Telescopic props with parts held relatively to each other by friction or gripping with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations

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)
FR551763D 1922-05-16 1922-05-16 flexible two-piece mine prop that fits together Expired FR551763A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR551763T 1922-05-16

Publications (1)

Publication Number Publication Date
FR551763A true FR551763A (en) 1923-04-13

Family

ID=8937088

Family Applications (1)

Application Number Title Priority Date Filing Date
FR551763D Expired FR551763A (en) 1922-05-16 1922-05-16 flexible two-piece mine prop that fits together

Country Status (1)

Country Link
FR (1) FR551763A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE927148C (en) * 1938-12-28 1955-05-02 Karl Gerlach Steel pit stamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE927148C (en) * 1938-12-28 1955-05-02 Karl Gerlach Steel pit stamp

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