GB864032A - Improvements relating to hydraulic pit props or the like - Google Patents

Improvements relating to hydraulic pit props or the like

Info

Publication number
GB864032A
GB864032A GB2143657A GB2143657A GB864032A GB 864032 A GB864032 A GB 864032A GB 2143657 A GB2143657 A GB 2143657A GB 2143657 A GB2143657 A GB 2143657A GB 864032 A GB864032 A GB 864032A
Authority
GB
United Kingdom
Prior art keywords
piston
improvements relating
hydraulic pit
july
lever
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
GB2143657A
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.)
Gutehoffnungshutte Sterkrade AG
Original Assignee
Gutehoffnungshutte Sterkrade AG
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 Gutehoffnungshutte Sterkrade AG filed Critical Gutehoffnungshutte Sterkrade AG
Publication of GB864032A publication Critical patent/GB864032A/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
    • E21D15/60—Devices for withdrawing props or chocks
    • E21D15/603—Devices for withdrawing props or chocks by means of hydraulic devices
    • 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
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves

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)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Safety Valves (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Fluid-Pressure Circuits (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Prostheses (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

864,032. Mine roof supports. GUTEHOFFNUNGSHUTTE STERKRADE A.G. July 5, 1957 [July 5, 1956], No. 21436/57. Class 20(2) A hydraulic pit prop comprises two telescoping parts 1, 2 which are extended by a differential piston 9,10, 11 operated by rotating a lever 41 through 180 degrees, and are released by rotating the lever 41 through the remaining 180 degrees to open, by means of a projection 14 on the piston 10, a ball valve 15 and subsequently a valve member 12. The prop is first extended t y a low pressure piston 11 and, when its relief valve 13 operates, is set by a high pressure piston 10. A pressure relief valve 11 A is provided.
GB2143657A 1956-07-05 1957-07-05 Improvements relating to hydraulic pit props or the like Expired GB864032A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG20647A DE1017118B (en) 1956-07-05 1956-07-05 Robbery valve for hydraulic pit rams
DEG20019A DE1010932B (en) 1956-07-05 1956-07-05 Hydraulic pit ram

Publications (1)

Publication Number Publication Date
GB864032A true GB864032A (en) 1961-03-29

Family

ID=25978072

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2143657A Expired GB864032A (en) 1956-07-05 1957-07-05 Improvements relating to hydraulic pit props or the like
GB3060857A Expired GB876396A (en) 1956-07-05 1957-09-30 Improvements relating to hydraulic pit-props or the like

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB3060857A Expired GB876396A (en) 1956-07-05 1957-09-30 Improvements relating to hydraulic pit-props or the like

Country Status (4)

Country Link
BE (2) BE558743A (en)
DE (2) DE1010932B (en)
FR (1) FR1178174A (en)
GB (2) GB864032A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2075120A (en) * 1980-05-05 1981-11-11 Johansson Hans Arne Valentin Hoisting gear for patient-lifting devices
WO2011101716A2 (en) 2010-02-19 2011-08-25 Council Of Scientific And Industrial Research A device for roof support of underground mine/tunnel

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB894292A (en) * 1957-07-30 1962-04-18 Mastabar Mining Equip Co Ltd Improvements in or relating to hydraulic props, particularly pit props
GB877624A (en) * 1958-07-31 1961-09-20 Dowty Mining Equipment Ltd Improvements in release valves for hydraulic props
DE1193458B (en) * 1958-08-11 1965-05-26 Dobson Ltd W E & F Wandering pit support
DE1168849B (en) * 1958-10-30 1964-04-30 Wilhelm Steinkopf Hydraulic pit ram
GB962542A (en) * 1959-08-21 1964-07-01 Acrow Eng Ltd Improvements in and relating to hydraulic props
DE1149318B (en) * 1960-08-05 1963-05-30 H Joe Rheinbay Dipl Ing Hydraulically operated pit ram
US4776561A (en) * 1986-12-05 1988-10-11 The Stanley Works Trigger control for air tool handle
DE102009009182A1 (en) 2009-02-16 2010-08-19 Süd-Chemie AG Zinc oxide crystal particles and methods of preparation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE922525C (en) * 1952-04-26 1955-01-17 Eisenwerk Wanheim G M B H Hydraulic pit ram

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2075120A (en) * 1980-05-05 1981-11-11 Johansson Hans Arne Valentin Hoisting gear for patient-lifting devices
WO2011101716A2 (en) 2010-02-19 2011-08-25 Council Of Scientific And Industrial Research A device for roof support of underground mine/tunnel

Also Published As

Publication number Publication date
DE1017118B (en) 1957-10-10
DE1010932B (en) 1957-06-27
FR1178174A (en) 1959-05-05
BE559146A (en)
GB876396A (en) 1961-08-30
BE558743A (en)

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