GB815577A - Improvements in manual controls for hydraulic pit props - Google Patents

Improvements in manual controls for hydraulic pit props

Info

Publication number
GB815577A
GB815577A GB1341756A GB1341756A GB815577A GB 815577 A GB815577 A GB 815577A GB 1341756 A GB1341756 A GB 1341756A GB 1341756 A GB1341756 A GB 1341756A GB 815577 A GB815577 A GB 815577A
Authority
GB
United Kingdom
Prior art keywords
plunger
operate
plate
valve
hydraulic
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
GB1341756A
Inventor
Alec Hodkinson
Joseph Alexander Wallace Mills
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.)
Dowty Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment Ltd
Filing date
Publication date
Priority to BE557124D priority Critical patent/BE557124A/fr
Application filed by Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Priority to FR1174412D priority patent/FR1174412A/en
Priority to DED25534A priority patent/DE1033160B/en
Publication of GB815577A publication Critical patent/GB815577A/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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props

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)
  • Earth Drilling (AREA)

Abstract

815,577. Hydraulic pit props. DOWTY MINING EQUIPMENT Ltd. April 23, 1957 [May 1, 1956], No. 13417/56. Class 20(2) An hydraulic telescopic pit prop comprises a plunger 19 adapted to be oscillated angularly about its axis to operate the pump 12 for extending the prop or moved along its axis to operate the release valve. The pump 12 is operated by a crank pin 26 on a plate 21 on the plunger 19 and the plate 21 is also adapted, by means of a bell-crank to operate the rod 17, Fig. 5, to open the release 46 by means of a spring plunger 48, a smaller valve 45 being initially opened by the rod 17 to give an initial reduction of pressure. A breather valve 36 is also opened by the plate 21. Both movements of the plunger 19 are produced by a handle 31 hooked on to a pin 29 on the plunger by means of a hook 52 or 53.
GB1341756A 1956-05-01 1956-05-01 Improvements in manual controls for hydraulic pit props Expired GB815577A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE557124D BE557124A (en) 1956-05-01
FR1174412D FR1174412A (en) 1956-05-01 1957-04-30 Improvements to manual controls of mine hydraulic props
DED25534A DE1033160B (en) 1956-05-01 1957-05-02 Actuating device for a hydraulic pit ram

Publications (1)

Publication Number Publication Date
GB815577A true GB815577A (en) 1959-07-01

Family

ID=1727565

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1341756A Expired GB815577A (en) 1956-05-01 1956-05-01 Improvements in manual controls for hydraulic pit props

Country Status (1)

Country Link
GB (1) GB815577A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220686A (en) * 1962-10-19 1965-11-30 Guardian Mining Props Ltd Telescopic pit prop

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220686A (en) * 1962-10-19 1965-11-30 Guardian Mining Props Ltd Telescopic pit prop

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