GB1234661A - - Google Patents

Info

Publication number
GB1234661A
GB1234661A GB247868A GB1234661DA GB1234661A GB 1234661 A GB1234661 A GB 1234661A GB 247868 A GB247868 A GB 247868A GB 1234661D A GB1234661D A GB 1234661DA GB 1234661 A GB1234661 A GB 1234661A
Authority
GB
United Kingdom
Prior art keywords
ram
extension
see
mine roof
advancing mine
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
GB247868A
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 filed Critical
Publication of GB1234661A publication Critical patent/GB1234661A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/0206—Hydraulically operated extension devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
    • E21D23/063—Retractable cantilever extensions therefor

Abstract

1,234,661. Advancing mine roof supports. GULLICK DOBSON Ltd. 19 Nov., 1968 [17 Jan., 1968], No. 2478/68. Heading E1P. In an advancing mine roof support frame having a cantilever extension 12 adapted to be reciprocated by a ram 15 the extension is adapted to be urged into engagement with the roof in any position between maximum and minimum extension by a second ram, see Fig. 8 (not shown) or a second plunger in the ram 15 acting on a wedge 21. The extension may be resiliently bonded by a bow-spring, see Fig. 6 (not shown). For details of ram 15 and its operation, Fig. 4 (not shown) and the Specification should be referred to.
GB247868A 1968-01-17 1968-01-17 Expired GB1234661A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB247868 1968-01-17

Publications (1)

Publication Number Publication Date
GB1234661A true GB1234661A (en) 1971-06-09

Family

ID=9740268

Family Applications (1)

Application Number Title Priority Date Filing Date
GB247868A Expired GB1234661A (en) 1968-01-17 1968-01-17

Country Status (3)

Country Link
US (1) US3534559A (en)
DE (1) DE1902043A1 (en)
GB (1) GB1234661A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449860A (en) * 1981-04-22 1984-05-22 Gewerkschaft Eisenhutte Westfalia Mine roof supports
GB2192659A (en) * 1986-07-15 1988-01-20 Gullick Dobson Ltd Mine roof support with hinged two part canopy and jack to control angle of parts

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1294917A (en) * 1970-06-26 1972-11-01
GB1329125A (en) * 1970-12-02 1973-09-05 Gullick Dobson Ltd Mine roof supports
GB1394675A (en) * 1971-07-16 1975-05-21 Gullick Dobson Ltd Mine roof support systems
GB1408429A (en) * 1972-07-14 1975-10-01 Mastabar Mining Equipment Co L Mine roof supports
DE3237719A1 (en) * 1982-10-12 1984-04-12 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen DEVICE FOR CONTROLLING A HANGING CAP IN RELATION TO A SLIDING CAP
GB2138062B (en) * 1983-04-16 1986-10-01 Dowty Mining Equipment Ltd Roof support suitable for use in mines
GB2143271B (en) * 1983-07-12 1986-08-06 Dowty Mining Equipment Ltd Mine roof support with tilting cantilever to canopy
DE3605236A1 (en) * 1986-02-19 1987-08-20 Gewerk Eisenhuette Westfalia CONTROL DEVICE FOR UNDERGROUND REMOVAL UNITS
GB2196371B (en) * 1986-10-15 1990-05-09 Gullick Dobson Ltd Mine roof supports

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB856720A (en) * 1956-08-18 1960-12-21 Dobson Ltd W E & F Improvements in roof supports for underground mines
US3216202A (en) * 1962-11-09 1965-11-09 Gullick Ltd Roof supporting means for mines
GB1091602A (en) * 1964-03-10 1967-11-22 Dowty Mining Equipment Ltd Roof support suitable for use in mines
GB1091603A (en) * 1964-03-31 1967-11-22 Dowty Mining Equipment Ltd Advanceable roof support suitable for use in mines
US3333426A (en) * 1964-04-11 1967-08-01 Gullick Ltd Self-advancing hydraulically extensible mine roof supports
FR1400585A (en) * 1964-04-16 1965-05-28 Gullick Ltd Pressure multiplier device and its applications
GB1148916A (en) * 1965-08-03 1969-04-16 Coal Industry Patents Ltd Mine roof supports
FR1467272A (en) * 1965-12-06 1967-01-27 Bennes Marrel Improvements to support extensions, especially for mines
US3381430A (en) * 1965-12-27 1968-05-07 Wico Corp Panel connector
FR1482298A (en) * 1966-05-24 1967-05-26 Kloeckner Werke Ag Hydraulic support frame for walking support

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449860A (en) * 1981-04-22 1984-05-22 Gewerkschaft Eisenhutte Westfalia Mine roof supports
GB2192659A (en) * 1986-07-15 1988-01-20 Gullick Dobson Ltd Mine roof support with hinged two part canopy and jack to control angle of parts
GB2192659B (en) * 1986-07-15 1990-04-11 Gullick Dobson Ltd Mine roof support roof engaging device

Also Published As

Publication number Publication date
US3534559A (en) 1970-10-20
DE1902043A1 (en) 1969-09-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees