FR994556A - Hinged metal extension for lead - Google Patents

Hinged metal extension for lead

Info

Publication number
FR994556A
FR994556A FR994556DA FR994556A FR 994556 A FR994556 A FR 994556A FR 994556D A FR994556D A FR 994556DA FR 994556 A FR994556 A FR 994556A
Authority
FR
France
Prior art keywords
lead
metal extension
hinged metal
hinged
extension
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
Pierre-Louis Allain
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 filed Critical
Application granted granted Critical
Publication of FR994556A publication Critical patent/FR994556A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/08—Cap joints for obtaining a coal-face free of pit-props
    • E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
FR994556D 1950-11-09 1949-07-08 Hinged metal extension for lead Expired FR994556A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2741250A GB688782A (en) 1950-11-09 1950-11-09 Improvements in steel roof-shoring devices in mines

Publications (1)

Publication Number Publication Date
FR994556A true FR994556A (en) 1951-11-19

Family

ID=10259148

Family Applications (2)

Application Number Title Priority Date Filing Date
FR994556D Expired FR994556A (en) 1950-11-09 1949-07-08 Hinged metal extension for lead
FR60222D Expired FR60222E (en) 1950-11-09 1950-04-18 Hinged metal extension for lead

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR60222D Expired FR60222E (en) 1950-11-09 1950-04-18 Hinged metal extension for lead

Country Status (5)

Country Link
BE (1) BE495485A (en)
DE (1) DE826909C (en)
FR (2) FR994556A (en)
GB (1) GB688782A (en)
NL (1) NL75535C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884272A (en) * 1955-01-19 1959-04-28 Hans Gerlach Roof support structure for mine workings
US2909253A (en) * 1956-03-02 1959-10-20 Hinze Otto Adjustable girder
DE1127844B (en) * 1956-03-12 1962-04-19 Karl Gerlach Swivel cap for pit construction
DE1165528B (en) * 1960-10-25 1964-03-19 Alexander Schmidt Grubenausbau Articulated leaf spring cap connection
CN109026109B (en) * 2018-10-09 2023-11-28 中国矿业大学(北京) Fully-mechanized caving mining intelligent coal caving mechanism

Also Published As

Publication number Publication date
GB688782A (en) 1953-03-11
FR60222E (en) 1954-10-12
NL75535C (en) 1954-03-15
DE826909C (en) 1952-01-07
BE495485A (en) 1950-09-01

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