US3365893A - Mine roof supports - Google Patents

Mine roof supports Download PDF

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Publication number
US3365893A
US3365893A US426069A US42606965A US3365893A US 3365893 A US3365893 A US 3365893A US 426069 A US426069 A US 426069A US 42606965 A US42606965 A US 42606965A US 3365893 A US3365893 A US 3365893A
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United States
Prior art keywords
roof
props
bar
canopy
supports
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Expired - Lifetime
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US426069A
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English (en)
Inventor
Archelaius D Allen
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Gullick Ltd
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Gullick Ltd
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Publication date
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Publication of US3365893A publication Critical patent/US3365893A/en
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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
    • E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
    • 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
    • E21D23/0047—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor without essential shifting devices

Definitions

  • a mine roof support comprises a rectangular base and four extensible props mounted at the corners of said base and a roof-engaging structure mounted on said extensible props.
  • the roof-engaging structure comprises an L-shaped part with rigid integral limbs stably mounted on three of the props and a cantilever bar resting on the remaining prop and pivotally connected to one limb of said L-shaped bar and extending alongside and beyond the other limb of said L-shaped part.
  • This invention is for improvements in or relating to mine roof supports.
  • powered or self-advancing roof supports In recent years powered or self-advancing roof supports have been developed and applied eifectively.
  • One such powered or self-advancing roof support comprises a plurality of hydraulically extensible props assembled in a base or structure and supporting, at their upper parts, a canopy or roof-bar structure.
  • the frame also houses a horizontally disposed double-acting ram means. This ram means serves to push over the conveyor towards the coal face, as cutting of the coal proceeds, and then, by anchoring the ram means to the conveyor and retracting it, the support is advanced up to the conveyor after the props have been temporarily released from between floor and roof.
  • supports comprising a rear unit having four legs or props to give a stable and solid Waste edge support and a forward unit comprising a roof-bar articulated to the rear unit, so as to be capable of conforming to the slope of the roof in the forward area, and resting on a single forward prop or leg.
  • An object of the present invention is to provide a roofbar or chock canopy arrangement having the required compromise between fiexibility and stability and which, at the same time, only involves two rows of props One behind the other.
  • a support system having only two rows of props has the great advantage that it is carrying a much smaller area of roof and therefore the construction of the individual supports or chocks is less: expensive.
  • a mine roof support having an L shaped or like roof-bar structure or canopy stably supported on an extensible prop or props, so as to be applied thereby to a mine roof and a cantilever roof-bar pivotally connected to one limb of the L or like shaped structure so as to extend alongside the other limb, and supported forwardly of its pivot by a further extensible prop.
  • a mine roof support comprising a base, at least four extensible props or legs mounted on said base at the corners of a four-sided figure (e.g. a rectangle) or polygon and a canopy or roof-bar engaging structure mounted on said legs or props, said canopy or roof-bar structure comprising a part stably mounted on at least three props or legs and a part resting on a single prop or leg and pivotally connected to said stably mounted part at a position to the rear of a forward supporting leg or prop of said stably mounted part of the canopy.
  • the part resting on a single leg or prop is pivotally connected to the stably mounted part of the canopy at a position well to the rear of a forward supporting leg or prop of the stably mounted part of the roof-bar engaging structure.
  • the roof support comprises four legs or chocks located at the corners of a rectangle and the stably mounted part of the canopy or roof-bar engaging structure is in the form of an L.
  • the other part of said canopy is a straight roofingbar having its rear part let in said L (i.e. into the space between the stem and foot of the L), so that the canopy or roof-bar structure as a whole comprises a rectangular rear portion and a forwardly extended portion or bar at one side of said rectangular portion.
  • stably mounted or supported where used in this specification in relation to a part of the roof-engaging structure or canopy, does not preclude some degree of articulation between the stably supported part and its props or legs to permit said part. to adjust itself to roof irregularities.
  • FIGURE 1 is a diagrammatic plan View showing one arrangement of supports at the coal face
  • FIGURE 2 is a side elevation of one of the supports used in the arrangement shown in FIGURE 1,
  • FIGURE 3 is a front elevation partly in section on the line IV-IV of FIGURE 2,
  • FIGURE 4 is a plan view of the canopy of the support shown in FIGURES 2 and 3, and
  • FIGURE 5 is a further plan view of the support shown in FIGURES 2 and 3 but with the roof-bar structure or canopy removed.
  • the support system comprises a plurality of individual chocks or supports extending along the coal face F at the rear of the conveyor C.
  • each support 10 comprises a rear base member 11 and a forward base member 12.
  • the rear base member 11 has sockets 13 and 14 in which are mounted hydraulically extensible legs or props 15 and 16.
  • the forward base member 12 has sockets 17 and 1% in which are mounted hydraulically extensible legs or props 19 and 20.
  • the props or legs may be permitted some degree of movement in their sockets 13, 14, 17, 18 by adopting, for example, the construction described in our British patent specifications Nos. 772,543 and 866,108.
  • Hingedly anchored at 21 to the rear base member 11 is the cylinder 22 of a double-acting hydraulic ram.
  • the ram proper 23 (see FIGURE 5) of this hydraulic ram is hingedly connected as indicated at 24 to a longitudinally extending bracket, spill plate or anchoring member 25 on the conveyor C. It should be noted that the ram proper 23 works freely through the forward base member 12.
  • the base members 11 and 12 are coupled together by means of links 26 hingedly connected to the rear base member 11 at 27 and hingedly connected to the forward base member 12 at 28. This arrangement provides for relative movement between the rear base member and the front base member so that they can adapt themselves to irregularities in the floor.
  • each support 10 comprises a stably supported L-shaped part having limbs 29 and 3t) rigidly connected together, at rightangles to one another, and a forwardly extending cantilever part 31.
  • the canopy part 29, 3t rests stably on the legs 15, 16, 19.
  • the cantilever part 31 of the roof-bar structure is hinged to the stably supported part 29, 3d at 32 and rests on the single leg 20. It will be noted that the hinge 32 is set well back with respect to the legs 19 and 20.
  • the cantilever member 31 may have a retractable and extensible extension bar 33 as shown in FIGURE 1.
  • the ram 23 is advanced. Following this the hydraulic legs or props 15, 16 and 19, 20 are temporarily released from between floor and roof and the ram 22, 23 is retracted so that the support is drawn forwardly towards the conveyor. The legs are then re-secured between floor and roof.
  • FIGURE 1 the supports 10 on the left-hand side have been advanced and those towards the right-hand side are in process of advancing or snaking the conveyor C.
  • the members of the roof-bar structure or canopy may rest on the upper parts of the props or legs by concave/ convex seatings in the usual way so as to permit of some relative movement between the roof-bars and the legs.
  • hinge joint .32 may be relatively loose or slack.
  • the L-shaped canopy part 29 gives the required rigid or stable structure, whilst the part 31 supported only by the leg 20, is capable of conforming to the roof slope and providing the necessary flexibility in the canopy.
  • a further advantage of this canopy arrangement is that an overlapping effect is achieved between the stable and rigid portion 29, 30 of the canopy and the flexible or adjustable part 31.
  • the two parts of the canopy are to some extent in side-byside relationship and together engage a rectangular area of the roof.
  • the part 31 extends forwardly of this area to provide roof support over the conveyor C and in the area immediately to the rear thereof.
  • the requirement for two rows of supports between the roof-bar hinge and the waste edge may at least in some circumstances, be waived.
  • the manner in which the L-shaped member 29, 30 is supported ensures a stable support to which the forwardly extended roof-bar 31 can be hinged whilst at the same time permitting of the use of only two rows of props in the system.
  • a mine roof support having a substantially L shaped roof-engaging structure with rigid integral limbs, extensible prop means for stably supporting said roof-engaging structure and a roof bar pivotally connected to one limb of said roof-engaging structure so as to extend alongside the other limb, and supported forwardly of its pivot by a further extensible prop means, whereby within the area cumulatively supported by said rigid roof-engaging structure and said roof bar pivotally attached thereto, a compromise between rigidity to give stability and flexibility to give conformity to roof slope is achieved.
  • a mine roof support comprising a base structure, at least four extensible props mounted on said base structure at the corners of a four-sided figure or polygon and a roof-engaging structure mounted on said props, said roof-engaging structure comprising an L-shaped part with rigid intergral limbs stably mounted on at least three props and a roof bar part resting on the remaining prop or props and pivotally connected to said stably mounted part at a position to the rear of a forward supporting prop of said stably mounted part of the roof-engaging structure.
  • a mine roof support comprising four extensible props located at the corners of a rectangular framework and a roof-engaging structure having a stably mounted part in the form of an L with rigid integral limbs positioned on three of said props and a roof-bar positioned towards it forward end on the remaining prop and having its rear part let into the space between the stem and foot of the L and pivoted thereto so that the roof-engaging structure as a whole comprises a rectangular rear portion and a forwardly extended roof bar portion at one side of said rectangular portion.
  • a mine roof support comprising a base structure having a forward base member and a rearward base member articulated together by link means and a substantially L shaped roof-engaging structure with rigid integral limbs stably supported on extensible prop means, mounted on said base structure, so as to be applied thereby to a mine roof, and a roof-bar pivotally connected to one limb of said roof-engaging structure so as to extend alongside and beyond the other limb, and supported forwardly of its pivot by a further extensible prop means mounted on said base structure.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Earth Drilling (AREA)
  • Bridges Or Land Bridges (AREA)
  • Tents Or Canopies (AREA)
US426069A 1964-02-12 1965-01-18 Mine roof supports Expired - Lifetime US3365893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5848/64A GB1045353A (en) 1964-02-12 1964-02-12 Improvements in or relating to mine roof supports

Publications (1)

Publication Number Publication Date
US3365893A true US3365893A (en) 1968-01-30

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Application Number Title Priority Date Filing Date
US426069A Expired - Lifetime US3365893A (en) 1964-02-12 1965-01-18 Mine roof supports

Country Status (5)

Country Link
US (1) US3365893A (de)
AT (1) AT259489B (de)
DE (1) DE1942914U (de)
FR (1) FR1424263A (de)
GB (1) GB1045353A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3646769A (en) * 1968-10-01 1972-03-07 Gullick Ltd Mine roof support
US4900091A (en) * 1987-09-12 1990-02-13 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Electrohydraulic coal-mining system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910281A (en) * 1956-10-19 1959-10-27 Rheinstahl Wanheim Gmbh Prop and conveyer arrangement for mines
US3197966A (en) * 1960-02-18 1965-08-03 Gullick Ltd Roof supporting means for mines
US3240021A (en) * 1961-07-22 1966-03-15 Mines Domanlales De Potasse D Mine roof supporting structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910281A (en) * 1956-10-19 1959-10-27 Rheinstahl Wanheim Gmbh Prop and conveyer arrangement for mines
US3197966A (en) * 1960-02-18 1965-08-03 Gullick Ltd Roof supporting means for mines
US3240021A (en) * 1961-07-22 1966-03-15 Mines Domanlales De Potasse D Mine roof supporting structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3646769A (en) * 1968-10-01 1972-03-07 Gullick Ltd Mine roof support
US4900091A (en) * 1987-09-12 1990-02-13 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Electrohydraulic coal-mining system

Also Published As

Publication number Publication date
AT259489B (de) 1968-01-10
GB1045353A (en) 1966-10-12
DE1942914U (de) 1966-07-28
FR1424263A (fr) 1966-01-07

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