FR889430A - self-tightening and self-loosening metal prop - Google Patents

self-tightening and self-loosening metal prop

Info

Publication number
FR889430A
FR889430A FR889430DA FR889430A FR 889430 A FR889430 A FR 889430A FR 889430D A FR889430D A FR 889430DA FR 889430 A FR889430 A FR 889430A
Authority
FR
France
Prior art keywords
self
tightening
loosening metal
metal prop
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
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.)
Louviere Bouvy SA Des Atel
Original Assignee
Louviere Bouvy SA Des Atel
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 Louviere Bouvy SA Des Atel filed Critical Louviere Bouvy SA Des Atel
Application granted granted Critical
Publication of FR889430A publication Critical patent/FR889430A/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
    • E21D15/54—Details of the ends of 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
    • E21D15/14—Telescopic props
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/285—Telescopic props with parts held relatively to each other by friction or gripping by means of wedges or wedge combinations

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)
FR889430D 1942-02-23 1942-12-28 self-tightening and self-loosening metal prop Expired FR889430A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE889430X 1942-02-23

Publications (1)

Publication Number Publication Date
FR889430A true FR889430A (en) 1944-01-10

Family

ID=3883928

Family Applications (1)

Application Number Title Priority Date Filing Date
FR889430D Expired FR889430A (en) 1942-02-23 1942-12-28 self-tightening and self-loosening metal prop

Country Status (1)

Country Link
FR (1) FR889430A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747828A (en) * 1950-04-18 1956-05-29 Becorit Grubenausbau Gmbh Mine post
DE977408C (en) * 1951-02-24 1966-05-26 Karl Gerlach Pit stamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747828A (en) * 1950-04-18 1956-05-29 Becorit Grubenausbau Gmbh Mine post
DE977408C (en) * 1951-02-24 1966-05-26 Karl Gerlach Pit stamp

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