GB2077831B - Positional control system - Google Patents

Positional control system

Info

Publication number
GB2077831B
GB2077831B GB8019859A GB8019859A GB2077831B GB 2077831 B GB2077831 B GB 2077831B GB 8019859 A GB8019859 A GB 8019859A GB 8019859 A GB8019859 A GB 8019859A GB 2077831 B GB2077831 B GB 2077831B
Authority
GB
United Kingdom
Prior art keywords
control system
positional control
positional
control
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
GB8019859A
Other versions
GB2077831A (en
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.)
DOWTY MINING DEV Ltd
Original Assignee
DOWTY MINING DEV 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 DOWTY MINING DEV Ltd filed Critical DOWTY MINING DEV Ltd
Priority to GB8019859A priority Critical patent/GB2077831B/en
Priority to DE19813123824 priority patent/DE3123824A1/en
Publication of GB2077831A publication Critical patent/GB2077831A/en
Application granted granted Critical
Publication of GB2077831B publication Critical patent/GB2077831B/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/04—Safety 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
GB8019859A 1980-06-18 1980-06-18 Positional control system Expired GB2077831B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8019859A GB2077831B (en) 1980-06-18 1980-06-18 Positional control system
DE19813123824 DE3123824A1 (en) 1980-06-18 1981-06-16 POSITION CONTROL SYSTEM, ESPECIALLY FOR STRUCTURE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8019859A GB2077831B (en) 1980-06-18 1980-06-18 Positional control system

Publications (2)

Publication Number Publication Date
GB2077831A GB2077831A (en) 1981-12-23
GB2077831B true GB2077831B (en) 1983-12-21

Family

ID=10514121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8019859A Expired GB2077831B (en) 1980-06-18 1980-06-18 Positional control system

Country Status (2)

Country Link
DE (1) DE3123824A1 (en)
GB (1) GB2077831B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202246B4 (en) * 1991-01-31 2004-03-04 Tiefenbach Bergbautechnik Gmbh obtaining means
WO2015031797A1 (en) 2013-08-29 2015-03-05 Joy Mm Delaware, Inc. Shearer anti-collision

Also Published As

Publication number Publication date
DE3123824A1 (en) 1982-04-15
GB2077831A (en) 1981-12-23

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee