US3269686A - Mine roof and like supports - Google Patents

Mine roof and like supports Download PDF

Info

Publication number
US3269686A
US3269686A US511892A US51189265A US3269686A US 3269686 A US3269686 A US 3269686A US 511892 A US511892 A US 511892A US 51189265 A US51189265 A US 51189265A US 3269686 A US3269686 A US 3269686A
Authority
US
United States
Prior art keywords
prop
mine roof
support
leaf
leg
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 - Lifetime
Application number
US511892A
Other languages
English (en)
Inventor
Allen Archelaius Dawson
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.)
Gullick Ltd
Original Assignee
Gullick 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
Application filed by Gullick Ltd filed Critical Gullick Ltd
Application granted granted Critical
Publication of US3269686A publication Critical patent/US3269686A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/0418—Positioning devices and stabilizing means for the props
    • 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

Definitions

  • This invention is for improvements in or relating to mine roof and like supports, of the kind having at least one leg or prop member.
  • the invention is more particularly concerned with such mine roof and like supports in which the leg or prop member is telescopic and is adapted to be extended by means of pressure-fluid.
  • a typical example of such a support is the self-advancing or powered roof support which comprises one or more. legs or prop members mounted in a frame and a hydraulic ram for advancing the support up to, or towards the coal face.
  • the ram is first extended to push a coal conveyor towards the coal face, newly exposed by the passage of a coal cutting machine, after which the support is' temporarily lowered and the ram is retracted, the ram being anchored to the conveyor so that, in effect, the support is advanced up to or towards the conveyor.
  • the legs or prop members should be held in the frame of the support in a substantially upright or other predetermined attitude for setting but in such a way that the legs or prop members can, to a limited extent, cant out of the vertical or other setting attitude to allow for any irregularities in the mine roof floor and/or roof.
  • the legs or prop members have been mounted in resilient (e.g. rubber) mountings or bushes or alternatively have been held in position in the frame of the support by means of springs.
  • An object of the present invention is to provide an improved arrangement for resiliently holding a leg or prop member of a mine roof support.
  • a mine roof support including a prop or leg held by a leafspring device having at least two parts in transverse planes so that the leaf-spring device will hold the prop or leg resiliently against movement in at least two directions.
  • the leafspring is twisted about its longitudinal axis so as to provide the just-mentioned two parts.
  • FIGURE 1 is a side elevation of a self-advancing mine roof support
  • FIGURE 2 is a perspective view of an embodiment of the invention incorporated in the support shown in FIGURE 1.
  • the support includes a rear unit comprising a base having a plurality of sockets 11 one for each of a plurality of telescopic hydraulically extensible legs or props 12.
  • a rear unit comprising a base having a plurality of sockets 11 one for each of a plurality of telescopic hydraulically extensible legs or props 12.
  • the actual seating on the base 10 for the base or sole of the prop is of United States Patent Oflice concave/convex or other form as indicated at 10a, to allow for canting of the prop.
  • a ram 10b is incorporated in the support for pushing over theconveyor C and advancing the support as previously described, the piston 100 of the ram being attached to the conveyor by an extension bar 10d and a clevis 10e.
  • the support also includes a forward unit having a base 10f and a single telescopic hydraulically extensible leg 12a, the base 10f being inthe form of an arch so that the bar 10d can pass freely through it.
  • the rear unit has a roof-engaging member 10g and the forward unit a roofengaging member 10h, these two members being hinged together at 10i.
  • Concave/convex seatings 10j are provided where the roof-engaging members rest on the legs.
  • the base 10 is hingedly connected to the base 10f by a link 10k.
  • each leg 12 is provided with a resilient supporting device comprising a bracket 14 on the base 10 and a bracket 15 on the leg.
  • a leaf-spring device Connected between the bracket 14 and the bracket 15 is a leaf-spring device which is twisted at 16 so as to provide two parts 17 and 18 in planes at right-angles to one another.
  • the leg or prop 12 is held captive, but resiliently, at a predetermined distance from its mountingl-l.
  • the centre of deformation 16 of the leaf-spring device 17, 18 is located so that the length y of the part 17 is greater than the length x of the part 18, thus greater flexibility is provided for movement of the leg or prop in the direction B, which is the direction of coal face advance, than in the direction A which is the direction of length of the seam.
  • the lengths of the parts 17 and 18 could be equal but in practice it is generally found desirable to allow for somewhat easier movement of the leg or prop in the direction of advance of the coal face.
  • the arrangement above described provides a very convenient means for doing this simply by selecting an appropriate ratio between and y.
  • the leg 12a may be provided with a similar resilient supporting device.
  • a mine roof support including a pivotally mounted prop member held by a leaf-spring having at least two parts in transverse planes whereby said leaf-spring device will hold the prop resiliently against movement in at least two transverse directions.
  • a mine roof support as claimed in claim 1 wherein a lower end of the leaf-spring is attached to a base member of the support and an upper end of the leaf-spring is attached to a laterally extending bracket on the prop member.
  • a mine roof support as claimed in claim 1 where in the two parts of the leaf-spring are of dilferent lengths whereby greater flexibility is provided in one direction than in the other and wherein the support further comprises means for advancing it towards a mineral face and wherein the leaf-spring is positioned so that the greator flexibility is provided for movement of the prop member in a direction towards the mineral face.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Springs (AREA)
  • Vibration Prevention Devices (AREA)
US511892A 1964-12-23 1965-12-03 Mine roof and like supports Expired - Lifetime US3269686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB52305/64A GB1115763A (en) 1964-12-23 1964-12-23 Improvements in or relating to mine roof and like supports

Publications (1)

Publication Number Publication Date
US3269686A true US3269686A (en) 1966-08-30

Family

ID=10463426

Family Applications (1)

Application Number Title Priority Date Filing Date
US511892A Expired - Lifetime US3269686A (en) 1964-12-23 1965-12-03 Mine roof and like supports

Country Status (4)

Country Link
US (1) US3269686A (de)
AT (1) AT257513B (de)
FR (1) FR1473053A (de)
GB (1) GB1115763A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3530678A (en) * 1967-04-28 1970-09-29 Karl Marie Groetschel Position restoring devices for mine roof props
US3646768A (en) * 1969-04-08 1972-03-07 Gullick Dobson Ltd Mine roof supports
US4030308A (en) * 1976-05-21 1977-06-21 Fletcher Sutcliffe Wild Limited Mine roof supports

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3530678A (en) * 1967-04-28 1970-09-29 Karl Marie Groetschel Position restoring devices for mine roof props
US3646768A (en) * 1969-04-08 1972-03-07 Gullick Dobson Ltd Mine roof supports
US4030308A (en) * 1976-05-21 1977-06-21 Fletcher Sutcliffe Wild Limited Mine roof supports

Also Published As

Publication number Publication date
AT257513B (de) 1967-10-10
GB1115763A (en) 1968-05-29
FR1473053A (fr) 1967-03-17

Similar Documents

Publication Publication Date Title
US3324664A (en) Resilient biasing device for mine roof support props
GB1168792A (en) Improvements relating to Roof Supports for Mine Workings
US4010618A (en) Mine roof support
US3902325A (en) Shield structure for the face support in mines
US4227833A (en) Mineral mining installation
US3928981A (en) Mine proof support
US3269686A (en) Mine roof and like supports
US3439508A (en) Mine roof support means
US4027489A (en) Mine roof support
US3362169A (en) Roof supporting systems for mine workings
US3952525A (en) Mine roof support
US3534559A (en) Mine roof supports
US3328966A (en) Movable face support for use in mines
US3333426A (en) Self-advancing hydraulically extensible mine roof supports
US3383867A (en) Mine roof supports
US3302411A (en) Walking mine roof support
US3309054A (en) Pivotal supporting devices particularly for mine roof supports
US4132081A (en) Mine roof support
US3375668A (en) Mine roof supports
US3197966A (en) Roof supporting means for mines
US4102140A (en) Self-advancing mine roof supports
US4121426A (en) Mine roof support unit and assembly
US3216202A (en) Roof supporting means for mines
US3270510A (en) Mine roof and like supports
US3732699A (en) Mine roof supports