GB748374A - Improvements in hydraulic pit props - Google Patents

Improvements in hydraulic pit props

Info

Publication number
GB748374A
GB748374A GB26349/53A GB2634953A GB748374A GB 748374 A GB748374 A GB 748374A GB 26349/53 A GB26349/53 A GB 26349/53A GB 2634953 A GB2634953 A GB 2634953A GB 748374 A GB748374 A GB 748374A
Authority
GB
United Kingdom
Prior art keywords
tube
piston
ram
valve
space
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
GB26349/53A
Other languages
English (en)
Inventor
Dudley George Sutton
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 Hydraulic Units Ltd
Original Assignee
Dowty Hydraulic Units 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
Priority to BE532039D priority Critical patent/BE532039A/xx
Priority to NL191038D priority patent/NL191038A/xx
Priority to NL92057D priority patent/NL92057C/xx
Application filed by Dowty Hydraulic Units Ltd filed Critical Dowty Hydraulic Units Ltd
Priority to GB26349/53A priority patent/GB748374A/en
Priority to US457097A priority patent/US2713773A/en
Priority to FR1113337D priority patent/FR1113337A/fr
Priority to DED18717A priority patent/DE977481C/de
Publication of GB748374A publication Critical patent/GB748374A/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
    • E21D15/15—Means counteracting entry of dirt; Built-in cleaning devices
    • E21D15/155—Built-in cleaning 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
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87378—Second valve assembly carried by first valve head

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)
  • Reciprocating Pumps (AREA)
  • Chairs Characterized By Structure (AREA)
  • Safety Valves (AREA)
  • Massaging Devices (AREA)
GB26349/53A 1953-09-24 1953-09-24 Improvements in hydraulic pit props Expired GB748374A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE532039D BE532039A (enrdf_load_stackoverflow) 1953-09-24
NL191038D NL191038A (enrdf_load_stackoverflow) 1953-09-24
NL92057D NL92057C (enrdf_load_stackoverflow) 1953-09-24
GB26349/53A GB748374A (en) 1953-09-24 1953-09-24 Improvements in hydraulic pit props
US457097A US2713773A (en) 1953-09-24 1954-09-20 Hydraulic pit prop or jack
FR1113337D FR1113337A (fr) 1953-09-24 1954-09-23 étançon hydraulique
DED18717A DE977481C (de) 1953-09-24 1954-09-23 In einem hydraulisch betaetigten Grubenstempel eingebaute Kolbenpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26349/53A GB748374A (en) 1953-09-24 1953-09-24 Improvements in hydraulic pit props

Publications (1)

Publication Number Publication Date
GB748374A true GB748374A (en) 1956-05-02

Family

ID=10242283

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26349/53A Expired GB748374A (en) 1953-09-24 1953-09-24 Improvements in hydraulic pit props

Country Status (6)

Country Link
US (1) US2713773A (enrdf_load_stackoverflow)
BE (1) BE532039A (enrdf_load_stackoverflow)
DE (1) DE977481C (enrdf_load_stackoverflow)
FR (1) FR1113337A (enrdf_load_stackoverflow)
GB (1) GB748374A (enrdf_load_stackoverflow)
NL (2) NL92057C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152375B (de) * 1959-08-21 1963-08-08 Acrow Eng Ltd Hydraulischer Grubenstempel
FR2474112A1 (fr) * 1980-01-21 1981-07-24 Commercial Shearing Verin a longue cloison pouvant servir de support de toits de mine

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE548513A (enrdf_load_stackoverflow) * 1955-06-10
DE1127841B (de) * 1955-08-13 1962-04-19 Kronprinz Ag Hydraulischer Grubenstempel
BE553228A (enrdf_load_stackoverflow) * 1955-12-08
NL211784A (enrdf_load_stackoverflow) * 1956-03-07
US2975803A (en) * 1956-04-19 1961-03-21 Blackhawk Mfg Co Pressure release and relief valve
DE1081848B (de) * 1956-06-28 1960-05-19 Becorit Grubenausbau Gmbh Hydraulischer Grubenstempel
GB894292A (en) * 1957-07-30 1962-04-18 Mastabar Mining Equip Co Ltd Improvements in or relating to hydraulic props, particularly pit props
NL110999C (enrdf_load_stackoverflow) * 1958-11-24
GB975826A (en) * 1961-01-31 1964-11-18 Dowty Mining Equipment Ltd Improvements relating to fluid flow control valves
JP3989023B2 (ja) * 1996-10-04 2007-10-10 ジョーンズ．チャールズ．ダブリュ ステレオグラフィックブック

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE553221C (de) * 1932-06-24 Matthias Rehse Kolbentiefpumpe
US947613A (en) * 1910-01-25 Bethlehem Steel Corp Hydraulic jack.
US1047007A (en) * 1912-02-02 1912-12-10 William J Drugan Hydraulic jack.
US1080062A (en) * 1912-02-17 1913-12-02 Bethlehem Steel Corp Pump mechanism for hydraulic jacks and like apparatus.
BE486663A (enrdf_load_stackoverflow) * 1948-01-12
GB640414A (en) * 1948-03-06 1950-07-19 Mavor & Coulson Ltd Improvements in props
DE943391C (de) * 1951-09-21 1956-05-17 Max Ehmke Pumpe mit Druckmittelantrieb

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152375B (de) * 1959-08-21 1963-08-08 Acrow Eng Ltd Hydraulischer Grubenstempel
FR2474112A1 (fr) * 1980-01-21 1981-07-24 Commercial Shearing Verin a longue cloison pouvant servir de support de toits de mine

Also Published As

Publication number Publication date
NL191038A (enrdf_load_stackoverflow) 1900-01-01
NL92057C (enrdf_load_stackoverflow) 1900-01-01
US2713773A (en) 1955-07-26
DE977481C (de) 1966-08-18
FR1113337A (fr) 1956-03-28
BE532039A (enrdf_load_stackoverflow) 1900-01-01

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