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GB790845A - Improvements in and relating to hydraulic props, chocks or the like - Google Patents

Improvements in and relating to hydraulic props, chocks or the like

Info

Publication number
GB790845A
GB790845A GB1134754A GB1134754A GB790845A GB 790845 A GB790845 A GB 790845A GB 1134754 A GB1134754 A GB 1134754A GB 1134754 A GB1134754 A GB 1134754A GB 790845 A GB790845 A GB 790845A
Authority
GB
United Kingdom
Prior art keywords
hydraulic
prop
pump
pressure
chocks
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
GB1134754A
Inventor
Charles Edward Day
Cyril Treharne Jones
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.)
Coal Industry Patents Ltd
Original Assignee
Coal Industry Patents 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
Priority to BE528205D priority Critical patent/BE528205A/xx
Application filed by Coal Industry Patents Ltd filed Critical Coal Industry Patents Ltd
Priority to GB1134754A priority patent/GB790845A/en
Priority to FR1102657D priority patent/FR1102657A/en
Publication of GB790845A publication Critical patent/GB790845A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/022—Systems essentially incorporating special features for controlling the speed or actuating force of an output member in which a rapid approach stroke is followed by a slower, high-force working stroke
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK 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 OR ROCK 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
    • E21D15/46—Telescopic props with load-measuring devices; with alarm devices
    • E21D15/465—Telescopic props with load-measuring devices; with alarm devices with essential hydraulic or pneumatic details
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/58—Devices for setting props or chocks
    • E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
    • E21D15/586—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Clamps And Clips (AREA)

Abstract

790,845. Hydraulic pit props COAL INDUSTRY (PATENTS), Ltd. July 20, 1954 [April 20, 1953], No. 11347/54. Class 20(2) An hydraulic prop or chuck is set by hydraulic pressure fluid from a pump which is also connected to the low pressure end of an hydraulic intensifier and when the pressure in the pump exceeds a given amount after the prop engages the roof, pressure responsive values cut off the direct connection from the pump to the prop and connect the high pressure end of the intensifier to the prop to load it.
GB1134754A 1953-04-20 1953-04-20 Improvements in and relating to hydraulic props, chocks or the like Expired GB790845A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE528205D BE528205A (en) 1953-04-20
GB1134754A GB790845A (en) 1953-04-20 1953-04-20 Improvements in and relating to hydraulic props, chocks or the like
FR1102657D FR1102657A (en) 1953-04-20 1954-04-20 hydraulic telescopic prop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1134754A GB790845A (en) 1953-04-20 1953-04-20 Improvements in and relating to hydraulic props, chocks or the like

Publications (1)

Publication Number Publication Date
GB790845A true GB790845A (en) 1958-02-19

Family

ID=9984606

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1134754A Expired GB790845A (en) 1953-04-20 1953-04-20 Improvements in and relating to hydraulic props, chocks or the like

Country Status (3)

Country Link
BE (1) BE528205A (en)
FR (1) FR1102657A (en)
GB (1) GB790845A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1031719A (en) * 1962-03-24 1966-06-02 Dobson Ltd W E & F Improvements in or relating to hydraulic pressure gauges for hydraulic roof supports and supports incorporating same

Also Published As

Publication number Publication date
BE528205A (en)
FR1102657A (en) 1955-10-25

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