GB819301A - Improvements relating to hydraulic pit props and the like - Google Patents

Improvements relating to hydraulic pit props and the like

Info

Publication number
GB819301A
GB819301A GB3649954A GB3649954A GB819301A GB 819301 A GB819301 A GB 819301A GB 3649954 A GB3649954 A GB 3649954A GB 3649954 A GB3649954 A GB 3649954A GB 819301 A GB819301 A GB 819301A
Authority
GB
United Kingdom
Prior art keywords
boss
lever
prop
spindle
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
GB3649954A
Other languages
English (en)
Inventor
Colin Michael Frye
Michael Charles Potts
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
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 BE543703D priority Critical patent/BE543703A/xx
Priority to DENDAT957925D priority patent/DE957925C/de
Application filed by Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Priority to GB3649954A priority patent/GB819301A/en
Publication of GB819301A publication Critical patent/GB819301A/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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/26—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of wood

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Mechanically-Actuated Valves (AREA)
GB3649954A 1954-12-16 1954-12-16 Improvements relating to hydraulic pit props and the like Expired GB819301A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE543703D BE543703A (https=) 1954-12-16
DENDAT957925D DE957925C (de) 1954-12-16 Mechanische Betätigungsvorrichtung fur das Druckmmderungsventil von hydraulischen Grubenstempeln
GB3649954A GB819301A (en) 1954-12-16 1954-12-16 Improvements relating to hydraulic pit props and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3649954A GB819301A (en) 1954-12-16 1954-12-16 Improvements relating to hydraulic pit props and the like

Publications (1)

Publication Number Publication Date
GB819301A true GB819301A (en) 1959-09-02

Family

ID=10388726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3649954A Expired GB819301A (en) 1954-12-16 1954-12-16 Improvements relating to hydraulic pit props and the like

Country Status (3)

Country Link
BE (1) BE543703A (https=)
DE (1) DE957925C (https=)
GB (1) GB819301A (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3252345A (en) * 1963-08-02 1966-05-24 Robertshaw Controls Co Actuating mechanism and parts therefor or the like
JPH0643867B2 (ja) * 1985-09-30 1994-06-08 アイシン精機株式会社 調圧弁用カム装置

Also Published As

Publication number Publication date
DE957925C (de) 1957-01-24
BE543703A (https=)

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