GB1086002A - An improved hydraulic prop - Google Patents

An improved hydraulic prop

Info

Publication number
GB1086002A
GB1086002A GB2314/64A GB231464A GB1086002A GB 1086002 A GB1086002 A GB 1086002A GB 2314/64 A GB2314/64 A GB 2314/64A GB 231464 A GB231464 A GB 231464A GB 1086002 A GB1086002 A GB 1086002A
Authority
GB
United Kingdom
Prior art keywords
spring
cap
hydraulic
jan
chamber
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
GB2314/64A
Inventor
Frank Town
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.)
Dobson Ltd W E & F
WE&F Dobson Ltd
Original Assignee
Dobson Ltd W E & F
WE&F Dobson 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 Dobson Ltd W E & F, WE&F Dobson Ltd filed Critical Dobson Ltd W E & F
Priority to GB2314/64A priority Critical patent/GB1086002A/en
Priority to US425123A priority patent/US3295814A/en
Priority to DED46241A priority patent/DE1226513B/en
Priority to BE658328D priority patent/BE658328A/xx
Priority to FR2374A priority patent/FR1421076A/en
Publication of GB1086002A publication Critical patent/GB1086002A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/60—Devices for withdrawing props or chocks
    • E21D15/606—Devices for withdrawing props or chocks the props being moved systematically
    • 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
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting 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
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms
    • 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
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/26—Hydraulic or pneumatic control

Abstract

1,086,002. Hydraulic pit props. W. E. & F. DOBSON Ltd. Jan. 11, 1965 [Jan. 18, 1964], No. 2314/64. Heading E1E. An hydraulic prop of the open circuit type is provided with a spring- loaded roof cap 23, a spigot 27, a spring- loaded cam slide 16, ball and plunger unit 15, 14 and an electric switch 1 or hydraulic pilot valve. The above arrangement is such that when the cap engages the roof and the fluid pressure in the chamber 3 overcomes that within a chamber 25 together with that of the spring 29, relative movement between the cap and the ram causes displacement of the members 14, 15, 16 to operate the switch or pilot valve and actuate an adjacent prop, connected in the circuit, for relative stepwise advancement.
GB2314/64A 1964-01-18 1964-01-18 An improved hydraulic prop Expired GB1086002A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB2314/64A GB1086002A (en) 1964-01-18 1964-01-18 An improved hydraulic prop
US425123A US3295814A (en) 1964-01-18 1965-01-13 Control means of mine roof supports
DED46241A DE1226513B (en) 1964-01-18 1965-01-14 Safety circuit for a wandering longwall mining
BE658328D BE658328A (en) 1964-01-18 1965-01-15
FR2374A FR1421076A (en) 1964-01-18 1965-01-18 Control device for mine roof support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2314/64A GB1086002A (en) 1964-01-18 1964-01-18 An improved hydraulic prop

Publications (1)

Publication Number Publication Date
GB1086002A true GB1086002A (en) 1967-10-04

Family

ID=9737370

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2314/64A Expired GB1086002A (en) 1964-01-18 1964-01-18 An improved hydraulic prop

Country Status (5)

Country Link
US (1) US3295814A (en)
BE (1) BE658328A (en)
DE (1) DE1226513B (en)
FR (1) FR1421076A (en)
GB (1) GB1086002A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164494A (en) * 1984-08-15 1986-03-19 Automotive Products Plc Hydraulic cylinder switch

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103291335A (en) * 2013-05-31 2013-09-11 巨隆集团芜湖兴隆液压有限公司 Balanced floating bidirectional lock
CN110259491A (en) * 2019-07-04 2019-09-20 山东中煤电器有限公司 The electronic direct-push reversal valve of hydraulic support

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069549B (en) * 1959-11-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164494A (en) * 1984-08-15 1986-03-19 Automotive Products Plc Hydraulic cylinder switch

Also Published As

Publication number Publication date
FR1421076A (en) 1965-12-10
DE1226513B (en) 1966-10-13
BE658328A (en) 1965-04-30
US3295814A (en) 1967-01-03

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