GB1224238A - Hydraulic jack arrangement in particular for use in mining operations - Google Patents

Hydraulic jack arrangement in particular for use in mining operations

Info

Publication number
GB1224238A
GB1224238A GB37734/68A GB3773468A GB1224238A GB 1224238 A GB1224238 A GB 1224238A GB 37734/68 A GB37734/68 A GB 37734/68A GB 3773468 A GB3773468 A GB 3773468A GB 1224238 A GB1224238 A GB 1224238A
Authority
GB
United Kingdom
Prior art keywords
passages
piston
prop
disc
created
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
GB37734/68A
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.)
Bergwerksverband GmbH
Original Assignee
Bergwerksverband GmbH
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 Bergwerksverband GmbH filed Critical Bergwerksverband GmbH
Publication of GB1224238A publication Critical patent/GB1224238A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2823—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT by a screw mechanism attached to the piston
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86558—Plural noncommunicating flow paths

Abstract

1,224,238. Hydraulic jacks. BERGWERKSVERBAND G.m.b.H. 7 Aug., 1968 [15 Sept., 1967], No. 37734/68. Heading B8J. [Also in Division E1] An hydraulic jack arrangement used as a pit prop comprises an outer part 1 with an inner part 2 provided with a piston 13 and a return spring 15. Hydraulic fluid can enter or leave the prop through a passage 16. The prop is provided with a pneumatic stroke-measuring device comprising a scale in the form of a rotatable disc 17 in a space defined by matching recesses in base 19 of the part 1 and a cylinder cover 20. The disc 17 is carried on a spindle 18 mounted on a thrust bearing 5 and has an upper threaded section screwed through a nut 4 attached to the piston 13. The disc 17 contains small holes 12 through which pairs of passages 8, 9; 10, 11; &c. can communicate with one another, the lower passages 9, 11 being supply passages for compressed air, the upper passages 8, 10 being exit passages. A continuous flow of compressed air exits from passages 8, 10. If a hole 12, Fig. 2, is in line with passages 8, 9 then a substantial laminar flow is created by which energy is transferred and a control circuit (not shown) actuated. If the hole 12 is not so located then a turbulent state is created and no signal developed. In dependence on the particular piston positions binary signals are generated which can be processed in various ways in a control system, e.g. to indicate the piston position.
GB37734/68A 1967-09-15 1968-08-07 Hydraulic jack arrangement in particular for use in mining operations Expired GB1224238A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1583068 1967-09-15

Publications (1)

Publication Number Publication Date
GB1224238A true GB1224238A (en) 1971-03-03

Family

ID=5679413

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37734/68A Expired GB1224238A (en) 1967-09-15 1968-08-07 Hydraulic jack arrangement in particular for use in mining operations

Country Status (3)

Country Link
US (1) US3583287A (en)
FR (1) FR1581859A (en)
GB (1) GB1224238A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982004293A1 (en) * 1981-05-28 1982-12-09 Archer John Richard Hydraulic linear actuator
FR2519373A1 (en) * 1982-01-07 1983-07-08 Gewerk Eisenhuette Westfalia DEVICE FOR MONITORING THE STROKE OF HYDRAULIC CONTROL CYLINDERS OF AN UNDERGROUND FELLING PLANT, IN PARTICULAR A PLANED FELLING PLANT
GB2154282A (en) * 1984-02-14 1985-09-04 H C H Manufacturing Ltd Fluid pressure actuators

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE446057B (en) * 1983-04-22 1986-08-11 Lars Erik Carlander DEVICE FOR CONTROLS FOR REGULATING THE EXV HEIGHT ADJUSTMENT OF WORKPLACE
GB2176354B (en) * 1985-06-07 1988-12-21 Hemscheidt Maschf Hermann Apparatus for the digital determination of the length of a piston stroke

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2964061A (en) * 1956-11-28 1960-12-13 English Electric Co Ltd Multi-way fluid selector valves
US2930362A (en) * 1956-12-03 1960-03-29 American Meter Co Pneumatic clock controlled motor
US2955574A (en) * 1958-01-13 1960-10-11 Gen Motors Corp Hydraulic actuator having cooling fluid circulation
US3003470A (en) * 1960-05-16 1961-10-10 Gen Motors Corp Actuator with variable position stroke limiter
US3092082A (en) * 1961-10-30 1963-06-04 Gen Motors Corp Actuator assembly
US3417663A (en) * 1965-03-04 1968-12-24 Robertshaw Controls Co Pneumatic programming means and the like
US3494175A (en) * 1968-09-05 1970-02-10 Us Navy Pressure commutator mode switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982004293A1 (en) * 1981-05-28 1982-12-09 Archer John Richard Hydraulic linear actuator
FR2519373A1 (en) * 1982-01-07 1983-07-08 Gewerk Eisenhuette Westfalia DEVICE FOR MONITORING THE STROKE OF HYDRAULIC CONTROL CYLINDERS OF AN UNDERGROUND FELLING PLANT, IN PARTICULAR A PLANED FELLING PLANT
GB2154282A (en) * 1984-02-14 1985-09-04 H C H Manufacturing Ltd Fluid pressure actuators

Also Published As

Publication number Publication date
US3583287A (en) 1971-06-08
FR1581859A (en) 1969-09-19

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