US3646768A - Mine roof supports - Google Patents

Mine roof supports Download PDF

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Publication number
US3646768A
US3646768A US24171A US3646768DA US3646768A US 3646768 A US3646768 A US 3646768A US 24171 A US24171 A US 24171A US 3646768D A US3646768D A US 3646768DA US 3646768 A US3646768 A US 3646768A
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US
United States
Prior art keywords
prop
support
holding devices
props
mine roof
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
US24171A
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English (en)
Inventor
Michael E Whitaker
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 Dobson Ltd
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Gullick Dobson Ltd
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Filing date
Publication date
Application filed by Gullick Dobson Ltd filed Critical Gullick Dobson Ltd
Application granted granted Critical
Publication of US3646768A publication Critical patent/US3646768A/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
    • E21D23/04—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
    • E21D23/0409—Aligning or guiding means for the supports or for the constitutive parts of the supports
    • 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

Definitions

  • ABSTRACT Foreign Application D8118 A self-advancing mine roof support has at least two extensible A r 8 1969 Great Britain 17 849/69 hydraulic props, mounted on blocks of elastomeric material, p and a prop aligning or positioning means.
  • the latter comprises [52] U S Cl 61/45 248/357 a retractable and extenclable device operative between the [51] i 15/44 props of the support so as to be responsive to angular move- [58] Field oi Search .61/4s D; 299/31, 33; 248/357, 1"? Perable give the P 248/354 H 354 L 91/170 MP lmtlal setting attitude when the support has been relleved of the roof load.
  • references Cited device is a hydraulic ram having a pressure fluid cylinder attached to one prop and a p1ston worklng 1n said cylinder and UNITED STATES PATENTS acting substantially vertically on a foot or member projecting laterally from the other prop.
  • a single prop ahgmng or posigown t1on1ng means may be arranged to align or pos1tion three, four 1 1 annon e a or more re sofa su rt.
  • This invention is for improvements in or relating to mine roof supports comprising a base or bases and at least two extensible props or legs mounted on said base or bases one behind or alongside the other and supporting a roof-engaging structure which is applied to the roof by extending the props and is lowered from the roof by retracting said props when it is required to advance the support towards themineral face.
  • a support is hereinafter referred to as a support of the kind specified.
  • Advance of a support of the kind specified towards the mineral face is commonly effected by a hydraulic ram incorporated in it, the support then being known as a powered or self-advancing support.
  • a mine roof support at least two extensible props and prop aligning or positioning means comprising a retractable and extendable device operative between said props of the support so as to be responsive to angular movement thereof and operable to give the props an initial setting attitude when the support has been relieved of the roof load.
  • the aligning or prop positioning means comprises a pressure-fluid cylinder attached to one prop or to a socket or housing therefor and a piston working in said cylinder and adapted to act on the other prop or on a housing or socket therefor.
  • the aligning or prop positioning means may be a spring compressed or stretched between the two props or between housings, sockets or other members associated therewith and which take part in angular movement or tilting of the props.
  • the retractable and extendable device may be adapted to resist tilting of the props out of their initial setting attitude when the support is under load.
  • the retractable and extendable device is a pressure fluid ram
  • a spring-loaded pressure relief valve may be included in the pressure fluid system of the ram.
  • roof-engaging structure or canopy is mounted on the upper parts of the props or legs.
  • the prop aligning or positioning means according to the invention may be arranged so as to have the advantage of applying an equal resisting moment to both props using only one aligning device and in particular has the advantage of overcoming the present uneven loading of the rear leg without additional cost in the construction of the support.
  • the prop aligning or positioning means comprises a pressure-fluid-operated rarn which acts downwardly or upwardly on a limb projecting laterally from the support.
  • FIG. 1 shows, in side elevation, the rear and front prop or leg of a support in their vertical attitude, in which attitude they are, in this particular case, initially set between floor and roof.
  • FIG. 2 shows the tilting of the legs from the vertical attitude due, for example, to roof convergence or the roof-engaging structure dragging against the roof during advance of the support, and
  • FIGS. 3, 4 and 5 are a sectional side elevation on the line V-V of FIG. 4, plan and front elevation respectively of a modification in which a single aligning or positioning device serves four props of a support.
  • the support shown on the drawings comprises a base 10 having mounted on it at least two side-by-side pairs of hydraulically extensible telescopic props, each pair comprising a rear prop and a forward prop. Only one pair of such props is shown on the drawings, the reference numeral 11 indicating the rear prop and the reference numeral 12 the forward prop.
  • These pairs of props support and apply a roof-engaging structure (e.g., a canopy or roof-bars), not shown, to the roof.
  • the rear prop 11 is positioned in a tubular socket or housing 13 having a laterally projecting foot 14, for a purpose hereinafter to be described, secured on a plate 15.
  • the plate 15 is mounted on a slab or pad of rubber l6 sandwiched between the plate 15 and the base 10 of the support.
  • This slab of rubber may be prestressed (compressed) to a desired degree by means of bolts which pass through aligned holes in the plate 15, slab l6 and the base 10. The centers of these holes are indicated at 17.
  • the front leg 12 is positioned in a tubular socket or housing 18 seated on, and attached to a plate 19 mounted on a rubber slab or pad 20 sandwiched between the plate 19 and the base 10 of the support.
  • the pad of rubber 20 may be prestressed (compressed) to a desired degree by means of bolts passed through aligned holes in the plate 19, slab 20 and the base 10, the centers of these bolt holes being indicated at 21.
  • the cylinder 22 of an aligning or positioning device for the props 11 and 12 is secured to the socket 18 for the prop 12.
  • a piston which works in the cylinder 22 has a piston rod 23 provided with a rounded or convex end 24 which bears against the laterally extended part 25 of the plate 15 to which the foot 14 of the socket 13 is secured.
  • a hydraulic pressure-fluid supply and discharge pipe 26 is connected to the cylinder 22.
  • a manually operable valve may be included in this pipe so that pressure fluid can be fed to or discharged from the ram cylinder 22 so as to set the props manually in a required attitude.
  • FIG. 1 shows how, due for example to roof convergence or drag of the roof-engaging structure against the roof during advance of the support, the props have been tilted out of the vertical.
  • the aligning devices 22, 23 may be arranged to resist this tilting of the props and such an arrangement has, in accordance with the invention, the advantage of applying an equal resisting moment to all four props at the rear of the support using only two rams or aligning devices 22, 23.
  • each ram 22, 23 During advance and resetting of the support pressure-fluid is supplied to each ram 22, 23 so that it acts to align the props, i.e., restore them to their vertical attitude.
  • the pipe 26 may be connected in the hydraulic system of the advancing ram of the support so that as the support is advanced the props are simultaneously aligned.
  • the props should not be set vertically but should be set in an attitude leading towards the face. This may be effected by increasing the projection of the piston 23 so that the plates 15 and 19 are depressed below the horizontal as shown in chain lines in FIG. 1. It will be appreciated that as the piston rod 23 pivots at 24 on the extension 25 of the plate 15 and as the cylinder 22 is at tached to the socket 18, said socket l8 and the socket 13 will tilt simultaneously and similarly under the action of the ram 22, 23.
  • a pressure relief valve may be incorporated, if required, in the hydraulic system of the ram 22, 23.
  • One ram or aligning device, 22, 23 can be used to align or position all four of the props or legs or more if provided in the support.
  • the cylinder 22 of a single ram is attached by a frame 27 to the front props 12 and the piston of said ram acts on a yoke 28 the ends of which are attached to the extended parts 25 of the plates 15.
  • a mine roof support including a base, at least two spacedapart prop-holding devices mounted on said base by means which provide for tilting of said prop-holding devices relatively to the base, an extensible prop in each of said prop-holding devices and a force responsive and force applying device having relatively contractable and extensible parts, one of said parts engaging one of said prop-holding devices and the other of said parts engaging the other of said prop-holding devices, whereby said force responsive and force applying device responds to said tilting of the prop-holding devices and is operative to apply a force simultaneously to said prop-holding devices to give the props therein an initial setting attitude when the support has been relieved of the roof load.
  • a mine roof support as claimed in claim 1 wherein the force responsive and force applying device comprises a pressure-fluid ram having its cylinder attached to one of the propholding devices and its piston engaging the other prop-holding device.
  • each prop-holding device is mounted on a block of elastomeric material for tilting movement relatively to the base.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Attitude Control For Articles On Conveyors (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US24171A 1969-04-08 1970-03-31 Mine roof supports Expired - Lifetime US3646768A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1784969 1969-04-08

Publications (1)

Publication Number Publication Date
US3646768A true US3646768A (en) 1972-03-07

Family

ID=10102300

Family Applications (1)

Application Number Title Priority Date Filing Date
US24171A Expired - Lifetime US3646768A (en) 1969-04-08 1970-03-31 Mine roof supports

Country Status (5)

Country Link
US (1) US3646768A (enrdf_load_stackoverflow)
AU (1) AU1304770A (enrdf_load_stackoverflow)
DE (1) DE2014372C3 (enrdf_load_stackoverflow)
FR (1) FR2043018A5 (enrdf_load_stackoverflow)
GB (1) GB1295075A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030308A (en) * 1976-05-21 1977-06-21 Fletcher Sutcliffe Wild Limited Mine roof supports
US4664563A (en) * 1984-09-21 1987-05-12 Basf Corporation Rigid polyurethane foams with constant or slightly decreasing strain with an increasing stress in compression

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1546630A (en) * 1976-12-29 1979-05-23 Fletcher Sutcliffe Wild Ltd Mine roof supports

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160389B (de) * 1961-08-21 1964-01-02 Mannesmann Ag Setzvorrichtung fuer Grubenstempel
US3188041A (en) * 1961-11-21 1965-06-08 Dobson Ltd W E & F Mine roof supports
GB1001412A (en) * 1960-09-15 1965-08-18 Dowty Mining Equipment Ltd Roof supports suitable for use in mines
US3250507A (en) * 1964-01-24 1966-05-10 Dowty Mining Equipment Ltd Roof supports
US3269686A (en) * 1964-12-23 1966-08-30 Gullick Ltd Mine roof and like supports
US3309054A (en) * 1964-08-11 1967-03-14 Gullick Ltd Pivotal supporting devices particularly for mine roof supports
US3484071A (en) * 1967-06-07 1969-12-16 Rheinstahl Wanheim Gmbh Mobile mine roof support

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001412A (en) * 1960-09-15 1965-08-18 Dowty Mining Equipment Ltd Roof supports suitable for use in mines
DE1160389B (de) * 1961-08-21 1964-01-02 Mannesmann Ag Setzvorrichtung fuer Grubenstempel
US3188041A (en) * 1961-11-21 1965-06-08 Dobson Ltd W E & F Mine roof supports
US3250507A (en) * 1964-01-24 1966-05-10 Dowty Mining Equipment Ltd Roof supports
US3309054A (en) * 1964-08-11 1967-03-14 Gullick Ltd Pivotal supporting devices particularly for mine roof supports
US3269686A (en) * 1964-12-23 1966-08-30 Gullick Ltd Mine roof and like supports
US3484071A (en) * 1967-06-07 1969-12-16 Rheinstahl Wanheim Gmbh Mobile mine roof support

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030308A (en) * 1976-05-21 1977-06-21 Fletcher Sutcliffe Wild Limited Mine roof supports
US4664563A (en) * 1984-09-21 1987-05-12 Basf Corporation Rigid polyurethane foams with constant or slightly decreasing strain with an increasing stress in compression

Also Published As

Publication number Publication date
GB1295075A (enrdf_load_stackoverflow) 1972-11-01
DE2014372A1 (enrdf_load_stackoverflow) 1970-10-15
AU1304770A (en) 1970-03-25
DE2014372C3 (de) 1973-01-04
FR2043018A5 (enrdf_load_stackoverflow) 1971-02-12

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