GB793803A - Improvements in or relating to props, especially for use in coal mines - Google Patents

Improvements in or relating to props, especially for use in coal mines

Info

Publication number
GB793803A
GB793803A GB16827/55A GB1682755A GB793803A GB 793803 A GB793803 A GB 793803A GB 16827/55 A GB16827/55 A GB 16827/55A GB 1682755 A GB1682755 A GB 1682755A GB 793803 A GB793803 A GB 793803A
Authority
GB
United Kingdom
Prior art keywords
spring
prop
piston
valve
load
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
GB16827/55A
Inventor
Bernard Tebb
Clarence Herbert Perry
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.)
Mastabar Mining Equipment Co Ltd
Original Assignee
Mastabar Mining Equipment Co 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 BE553227D priority Critical patent/BE553227A/xx
Priority to BE548513D priority patent/BE548513A/xx
Application filed by Mastabar Mining Equipment Co Ltd filed Critical Mastabar Mining Equipment Co Ltd
Priority to GB16827/55A priority patent/GB793803A/en
Priority to GB35218/55A priority patent/GB802803A/en
Priority to FR1151305D priority patent/FR1151305A/en
Priority to US590185A priority patent/US2895454A/en
Priority to DEM30743A priority patent/DE1063554B/en
Priority to DEM32498A priority patent/DE1064907B/en
Priority to FR1162002D priority patent/FR1162002A/en
Priority to DER20511A priority patent/DE1063555B/en
Publication of GB793803A publication Critical patent/GB793803A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/22—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure
    • 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
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/30—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber
    • E21D15/306—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber by means of a liquid
    • 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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Control Of Presses (AREA)
  • Safety Valves (AREA)
  • Actuator (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
  • Emergency Lowering Means (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

793,803. Hydraulic pit proos. MASTABAR MINING EQUIPMENT CO., Ltd., [formerly MASTABAR BELT FASTENER CO., Ltd.]. June 7, 1856 [June 10, 1955], No. 16827/55. Class 20(2) [Also in Group XXIX] The spring pressure relief valve of an hydraulic pit prop is adapted to open at pressures increasing with the load on the pit prop. In Fig. 1 the relief valve 57 is maintained closed by an arm 62 on a torsion bar spring 61 the torsion of which is increased by a cam on the end of a bar 73, moved upwards by a connection 74 to the lower prop part 14 as the prop collapses under load. In a modification the relief value 83, Fig. 4, is held closed by a spring 84 attached to a piston 81 in the upper prop part 11. As liquid escapes from the prop pressure chamber, on increase of load, through the valve 83 to the reservoir space 82 in the part 11 it raises the piston 81 and increases the tension of the spring. In a modification of this construction the spring is above the piston 81 acting as a compression 'spring to force the valve 83 down on to its seat.
GB16827/55A 1955-06-10 1955-06-10 Improvements in or relating to props, especially for use in coal mines Expired GB793803A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BE553227D BE553227A (en) 1955-06-10
BE548513D BE548513A (en) 1955-06-10
GB16827/55A GB793803A (en) 1955-06-10 1955-06-10 Improvements in or relating to props, especially for use in coal mines
GB35218/55A GB802803A (en) 1955-06-10 1955-12-08 Improvements in or relating to hydraulic pit props
US590185A US2895454A (en) 1955-06-10 1956-06-08 Props, especially for use in coal mines
FR1151305D FR1151305A (en) 1955-06-10 1956-06-08 prop, especially for use in coal mines
DEM30743A DE1063554B (en) 1955-06-10 1956-06-09 Hydraulic pit ram
DEM32498A DE1064907B (en) 1955-06-10 1956-11-29 Hydraulic pit ram
FR1162002D FR1162002A (en) 1955-06-10 1956-12-06 Adjustable release device for hydraulic props
DER20511A DE1063555B (en) 1955-06-10 1957-02-08 Metal pit stamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16827/55A GB793803A (en) 1955-06-10 1955-06-10 Improvements in or relating to props, especially for use in coal mines

Publications (1)

Publication Number Publication Date
GB793803A true GB793803A (en) 1958-04-23

Family

ID=10084401

Family Applications (2)

Application Number Title Priority Date Filing Date
GB16827/55A Expired GB793803A (en) 1955-06-10 1955-06-10 Improvements in or relating to props, especially for use in coal mines
GB35218/55A Expired GB802803A (en) 1955-06-10 1955-12-08 Improvements in or relating to hydraulic pit props

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB35218/55A Expired GB802803A (en) 1955-06-10 1955-12-08 Improvements in or relating to hydraulic pit props

Country Status (5)

Country Link
US (1) US2895454A (en)
BE (2) BE553227A (en)
DE (2) DE1063554B (en)
FR (2) FR1151305A (en)
GB (2) GB793803A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220686A (en) * 1962-10-19 1965-11-30 Guardian Mining Props Ltd Telescopic pit prop

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB894292A (en) * 1957-07-30 1962-04-18 Mastabar Mining Equip Co Ltd Improvements in or relating to hydraulic props, particularly pit props
GB898987A (en) * 1960-04-19 1962-06-20 Mastabar Mining Equip Co Ltd Improvements in or relating to hydraulic supports
US3112705A (en) * 1961-10-05 1963-12-03 Jane Wallen Two-speed hydraulic pumps
US3394634A (en) * 1966-10-21 1968-07-30 George M. Pfundt Internal relief valve for hydrauli cally actuated pole pullers
US3476019A (en) * 1967-09-08 1969-11-04 Berg Mfg & Sales Co Air-assisted emergency spring brake assembly
FR2976058B1 (en) 2011-05-30 2013-07-05 Prestige Solaire MOTORIZED ROTATION DRIVE SYSTEM FOR FOLLOWING SUPPORT SYSTEM FOR SOLAR SENSOR
CN111594235B (en) * 2020-04-22 2021-06-18 山东科技大学 Buffer type mining supporting equipment and supporting method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618122A (en) * 1946-04-18 1952-11-18 Gratzmuller Jean Louis Telescopic hydraulic jack
BE486663A (en) * 1948-01-12
GB636568A (en) * 1953-07-20 1950-05-03 George Herbert Dowty Improvements in pit props and other telescopic struts
GB640414A (en) * 1948-03-06 1950-07-19 Mavor & Coulson Ltd Improvements in props
DE928945C (en) * 1951-06-09 1955-06-16 Eisenwerk Wanheim G M B H Adjustable hydraulic pit ram
GB700790A (en) * 1951-07-19 1953-12-09 Dowty Auto Units Ltd Improvements relating to valves
DE950183C (en) * 1953-02-26 1956-10-04 August Bilstein G M B H Hydraulic lifting device, in particular for setting pit punches
NL191038A (en) * 1953-09-24 1900-01-01

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220686A (en) * 1962-10-19 1965-11-30 Guardian Mining Props Ltd Telescopic pit prop

Also Published As

Publication number Publication date
FR1151305A (en) 1958-01-29
BE553227A (en)
FR1162002A (en) 1958-09-08
DE1064907B (en) 1959-09-10
GB802803A (en) 1958-10-15
BE548513A (en)
US2895454A (en) 1959-07-21
DE1063554B (en) 1959-08-20

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