GB876396A - Improvements relating to hydraulic pit-props or the like - Google Patents

Improvements relating to hydraulic pit-props or the like

Info

Publication number
GB876396A
GB876396A GB3060857A GB3060857A GB876396A GB 876396 A GB876396 A GB 876396A GB 3060857 A GB3060857 A GB 3060857A GB 3060857 A GB3060857 A GB 3060857A GB 876396 A GB876396 A GB 876396A
Authority
GB
United Kingdom
Prior art keywords
props
improvements relating
hydraulic pit
pit
valve
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
GB3060857A
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 GB876396A publication Critical patent/GB876396A/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)
  • Prostheses (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Rod-Shaped Construction Members (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)
  • Safety Valves (AREA)

Abstract

876,396. Pit props. GUTEHOFFNUNGSHUTTE STERKRADE A. G. Sept. 30, 1957 [Sept. 29, 1956], No. 30608/57. Class 20(2) [Also in Group XXIX] A hydraulic pit prop comprises a release valve 4, which is held closed by the pressure in a chamber 3 and is released by operation of an auxiliary valve 6 which allows fluid to enter a chamber 9 and act on a piston 4B carried by the valve 4.
GB3060857A 1956-07-05 1957-09-30 Improvements relating to hydraulic pit-props or the like Expired GB876396A (en)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
GB876396A true GB876396A (en) 1961-08-30

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 Before (1)

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

Country Status (4)

Country Link
BE (2) BE558743A (en)
DE (2) DE1017118B (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
GB2198215A (en) * 1986-12-05 1988-06-08 Stanley Works Trigger control for air powered tool

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
DE102009009182A1 (en) 2009-02-16 2010-08-19 Süd-Chemie AG Zinc oxide crystal particles and methods of preparation
CN102844523B (en) 2010-02-19 2014-09-24 科学与工业研究会 A device for roof support of underground mine/tunnel

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 (4)

* 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
US4487019A (en) * 1980-05-05 1984-12-11 Johansson Hans Arne Valentin Hoisting gear at patient-lifting devices
GB2198215A (en) * 1986-12-05 1988-06-08 Stanley Works Trigger control for air powered tool
GB2198215B (en) * 1986-12-05 1991-05-29 Stanley Works An air powered hand tool

Also Published As

Publication number Publication date
DE1010932B (en) 1957-06-27
FR1178174A (en) 1959-05-05
DE1017118B (en) 1957-10-10
BE559146A (en)
BE558743A (en)
GB864032A (en) 1961-03-29

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