FR1307469A - Amplificateur de pression hydraulique, applicable ou incorporable à un disnositif de support de plafond de mines - Google Patents

Amplificateur de pression hydraulique, applicable ou incorporable à un disnositif de support de plafond de mines

Info

Publication number
FR1307469A
FR1307469A FR880690A FR880690A FR1307469A FR 1307469 A FR1307469 A FR 1307469A FR 880690 A FR880690 A FR 880690A FR 880690 A FR880690 A FR 880690A FR 1307469 A FR1307469 A FR 1307469A
Authority
FR
France
Prior art keywords
applicable
incorporated
hydraulic pressure
support device
ceiling support
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
FR880690A
Other languages
English (en)
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.)
Dobson Ltd W E & F
WE&F Dobson Ltd
Original Assignee
Dobson Ltd W E & F
WE&F Dobson Ltd
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 Dobson Ltd W E & F, WE&F Dobson Ltd filed Critical Dobson Ltd W E & F
Priority to FR880690A priority Critical patent/FR1307469A/fr
Application granted granted Critical
Publication of FR1307469A publication Critical patent/FR1307469A/fr
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0069—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices without essential advancing shifting devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0073—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices with advancing shifting devices connected therewith

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)
FR880690A 1961-12-01 1961-12-01 Amplificateur de pression hydraulique, applicable ou incorporable à un disnositif de support de plafond de mines Expired FR1307469A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR880690A FR1307469A (fr) 1961-12-01 1961-12-01 Amplificateur de pression hydraulique, applicable ou incorporable à un disnositif de support de plafond de mines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR880690A FR1307469A (fr) 1961-12-01 1961-12-01 Amplificateur de pression hydraulique, applicable ou incorporable à un disnositif de support de plafond de mines

Publications (1)

Publication Number Publication Date
FR1307469A true FR1307469A (fr) 1962-10-26

Family

ID=8767886

Family Applications (1)

Application Number Title Priority Date Filing Date
FR880690A Expired FR1307469A (fr) 1961-12-01 1961-12-01 Amplificateur de pression hydraulique, applicable ou incorporable à un disnositif de support de plafond de mines

Country Status (1)

Country Link
FR (1) FR1307469A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245293B (de) * 1964-01-18 1967-07-27 Dobson Ltd W E & F Hydraulischer Rueckzylinder zum Ruecken von entlang dem Kohlenstoss angeordneten Ausbaueinheiten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245293B (de) * 1964-01-18 1967-07-27 Dobson Ltd W E & F Hydraulischer Rueckzylinder zum Ruecken von entlang dem Kohlenstoss angeordneten Ausbaueinheiten

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