GB249678A - Improvements in struts, props or jacks for use in trenches, mines and other places - Google Patents

Improvements in struts, props or jacks for use in trenches, mines and other places

Info

Publication number
GB249678A
GB249678A GB844425A GB844425A GB249678A GB 249678 A GB249678 A GB 249678A GB 844425 A GB844425 A GB 844425A GB 844425 A GB844425 A GB 844425A GB 249678 A GB249678 A GB 249678A
Authority
GB
United Kingdom
Prior art keywords
screw
sleeve
packing
base
nut
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
GB844425A
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.)
HENRY GEORGE WOODHAM
Original Assignee
HENRY GEORGE WOODHAM
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 HENRY GEORGE WOODHAM filed Critical HENRY GEORGE WOODHAM
Priority to GB844425A priority Critical patent/GB249678A/en
Publication of GB249678A publication Critical patent/GB249678A/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
    • E21D15/50—Component parts or details of props
    • E21D15/52—Extensible units located above or below standard props
    • E21D15/526—Extensible units located above or below standard props for step-by-step extension of the prop
    • 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
    • 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
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/24—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism
    • 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
    • E21D15/54—Details of the ends of 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)
  • Pivots And Pivotal Connections (AREA)

Abstract

249,678. Woodham, H. G. March 30, 1925. Jacks. -An adjustable mine-prop or jack of the kind having a screw and nut and a protecting sleeve is provided with packing between the inner and outer sleeves, the inner sleeve carrying an adjustable head and the screw a base-plate. The base-plate a is ribbed and has studs a<5> and apertures a<3> for securing spikes and is secured to the lower end of the screw b. The screw carries a nut f with a sleeve extension f<1> perforated for a tommy-bar g and having a ball-joint connection f<3> with the head h. The protecting sleeve d is secured at its lower end d<1> to the screw and is provided at its upper end with a recess d<2> for packing e. A ball-jointed base m, Fig. 3, may be used and extension tubes k may be fitted between the base and the screw. The parts may be reversed so that the nut is at the top of the screw and the packing at the bottom of the sleeve. In a duplex form a right and left-handed screw is centrally perforated for the tommy-bar and carries outer sleeve extensions with packing at the ends.
GB844425A 1925-03-30 1925-03-30 Improvements in struts, props or jacks for use in trenches, mines and other places Expired GB249678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB844425A GB249678A (en) 1925-03-30 1925-03-30 Improvements in struts, props or jacks for use in trenches, mines and other places

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB844425A GB249678A (en) 1925-03-30 1925-03-30 Improvements in struts, props or jacks for use in trenches, mines and other places

Publications (1)

Publication Number Publication Date
GB249678A true GB249678A (en) 1926-04-01

Family

ID=9852598

Family Applications (1)

Application Number Title Priority Date Filing Date
GB844425A Expired GB249678A (en) 1925-03-30 1925-03-30 Improvements in struts, props or jacks for use in trenches, mines and other places

Country Status (1)

Country Link
GB (1) GB249678A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960443C (en) * 1948-10-02 1957-03-21 Becorit Grubenausbau Gmbh Longwall mining
DE1010032B (en) * 1955-02-14 1957-06-13 Dobson Ltd W E & F Support device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960443C (en) * 1948-10-02 1957-03-21 Becorit Grubenausbau Gmbh Longwall mining
DE1010032B (en) * 1955-02-14 1957-06-13 Dobson Ltd W E & F Support device

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