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FR934603A - Improvements to extendable props - Google Patents

Improvements to extendable props

Info

Publication number
FR934603A
FR934603A FR934603DA FR934603A FR 934603 A FR934603 A FR 934603A FR 934603D A FR934603D A FR 934603DA FR 934603 A FR934603 A FR 934603A
Authority
FR
France
Prior art keywords
props
extendable
extendable props
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)
Inventor
Ferdinand Schulte
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR934603A publication Critical patent/FR934603A/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
    • E21D15/42—Telescopic props with parts held relatively to each other by friction or gripping with special parts to influence the friction
    • 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)
  • Gates (AREA)
  • Lock And Its Accessories (AREA)
FR934603D 1946-10-02 1946-10-02 Improvements to extendable props Expired FR934603A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR934603T 1946-10-02

Publications (1)

Publication Number Publication Date
FR934603A true FR934603A (en) 1948-05-27

Family

ID=9456239

Family Applications (1)

Application Number Title Priority Date Filing Date
FR934603D Expired FR934603A (en) 1946-10-02 1946-10-02 Improvements to extendable props

Country Status (2)

Country Link
BE (2) BE472730A (en)
FR (1) FR934603A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744717A (en) * 1950-12-16 1956-05-08 Schwarz Hermann Kg Lock for metallic mine props
DE972849C (en) * 1950-09-09 1959-10-08 Le Progres Charbonnier Prochar Pit stamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972849C (en) * 1950-09-09 1959-10-08 Le Progres Charbonnier Prochar Pit stamp
US2744717A (en) * 1950-12-16 1956-05-08 Schwarz Hermann Kg Lock for metallic mine props

Also Published As

Publication number Publication date
BE472730A (en) 1947-05-31
BE490315A (en) 1949-08-16

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