GB706088A - Apparatus for mine roof control - Google Patents

Apparatus for mine roof control

Info

Publication number
GB706088A
GB706088A GB26960/52A GB2696052A GB706088A GB 706088 A GB706088 A GB 706088A GB 26960/52 A GB26960/52 A GB 26960/52A GB 2696052 A GB2696052 A GB 2696052A GB 706088 A GB706088 A GB 706088A
Authority
GB
United Kingdom
Prior art keywords
jack
floor
engaging means
frames
abutment
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
GB26960/52A
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.)
Joy Manufacturing Co
Original Assignee
Joy Manufacturing Co
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 Joy Manufacturing Co filed Critical Joy Manufacturing Co
Publication of GB706088A publication Critical patent/GB706088A/en
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
    • E21D23/08—Advancing mechanisms
    • E21D23/081—Advancing mechanisms forming parts of the roof supports
    • E21D23/087—Advancing mechanisms forming parts of the roof supports acting directly on the walls of the seam
    • E21D23/088—Advancing mechanisms forming parts of the roof supports acting directly on the walls of the seam by means of wheels, rollers, caterpillars, belts or worm screws

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)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

706,088. Hydraulic jacks. JOY MANUFACTURING CO. June 18, 1948 [May 1, 1948], No. 26960/52. Divided out of 706,002. Class 78 (3) [Also in Groups X. and XXXI] A mine roof support comprises a forward jack 10 having floor and roof engaging means 11, 12 connected by chains 39 to the floor and roof engaging means of a rearward jack 21 and a double-acting piston and cylinder 28 between the forward jack and an abutment jack 24, adapted to move the jacks 10, 21 forward relative to the abutment jack or vice-versa. Each floor and roof engaging means comprises freely circulating endless tracks on frames 19 which are carried by trunnions on the ends of a cross bar 17 which in the case of the roof engaging means has a universal mounting on the top of the jack. The pressure fluid supplied to the abutment jack passes through the piston rod of the cylinder 28. Downwardly inclined frames 42 are pivoted to extensions at the rear of the frames 19 of the rearward jack and engage the floor by wheels 45 and carry endless tracks.
GB26960/52A 1948-05-01 1948-06-18 Apparatus for mine roof control Expired GB706088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US706088XA 1948-05-01 1948-05-01

Publications (1)

Publication Number Publication Date
GB706088A true GB706088A (en) 1954-03-24

Family

ID=22096344

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26960/52A Expired GB706088A (en) 1948-05-01 1948-06-18 Apparatus for mine roof control

Country Status (1)

Country Link
GB (1) GB706088A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108361052A (en) * 2018-05-02 2018-08-03 石家庄煤矿机械有限责任公司 Without the support quick holder of self-loopa repeatedly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108361052A (en) * 2018-05-02 2018-08-03 石家庄煤矿机械有限责任公司 Without the support quick holder of self-loopa repeatedly

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