GB702411A - Improvements in lifting and thrusting apparatus - Google Patents

Improvements in lifting and thrusting apparatus

Info

Publication number
GB702411A
GB702411A GB1842051A GB1842051A GB702411A GB 702411 A GB702411 A GB 702411A GB 1842051 A GB1842051 A GB 1842051A GB 1842051 A GB1842051 A GB 1842051A GB 702411 A GB702411 A GB 702411A
Authority
GB
United Kingdom
Prior art keywords
rack
casing
bar
prop
automatically
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
GB1842051A
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.)
GEORGE SPURS SMITH
HUGH WOOD AND Co Ltd
MCHUGH AND Co Ltd AS
Original Assignee
GEORGE SPURS SMITH
HUGH WOOD AND Co Ltd
MCHUGH AND Co Ltd AS
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 GEORGE SPURS SMITH, HUGH WOOD AND Co Ltd, MCHUGH AND Co Ltd AS filed Critical GEORGE SPURS SMITH
Priority to GB1842051A priority Critical patent/GB702411A/en
Publication of GB702411A publication Critical patent/GB702411A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F13/00—Transport specially adapted to underground conditions
    • E21F13/06—Transport of mined material at or adjacent to the working face

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Transmission Devices (AREA)
  • Types And Forms Of Lifts (AREA)

Abstract

702,411. Jacks; ratchet gearing, actuated by levers. McHUGH & CO., Ltd., A. S., WOOD & CO:, Ltd., H., and SMITH, G.S. Nov. 12, 1951 [Aug. 3, 1951], No. 18420/51. Class 78 (3) A thrusting jack consists of a rack bar 10 driven outwardly from a casing 1 by a mechanism 7 which is as described in Specification 582,998, and has a mechanism for automatically friction braking the rack in any position of adjustment, and for automatically freeing it when the rack is further extended by actuation of the ratchet driving lever 11 ; the casing 1 having a ground engaging foot 2 and being pivoted at 30 to a pit prop or jack 3 which, when engaged with a mine roof provides a reaction member for the rack. A detachable spring link connection 5 is'provided between the prop and casing. In a. modification (Fig. 4) the rack is replaced by a bar 12 slidably mounted in a casing 13, and having a chain 14 which is adjustably secured thereto at 17, 18, and passes over a driving sprocket 21 and guide rollers 19, 20.
GB1842051A 1951-08-03 1951-08-03 Improvements in lifting and thrusting apparatus Expired GB702411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1842051A GB702411A (en) 1951-08-03 1951-08-03 Improvements in lifting and thrusting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1842051A GB702411A (en) 1951-08-03 1951-08-03 Improvements in lifting and thrusting apparatus

Publications (1)

Publication Number Publication Date
GB702411A true GB702411A (en) 1954-01-13

Family

ID=10112136

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1842051A Expired GB702411A (en) 1951-08-03 1951-08-03 Improvements in lifting and thrusting apparatus

Country Status (1)

Country Link
GB (1) GB702411A (en)

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