GB802803A - Improvements in or relating to hydraulic pit props - Google Patents

Improvements in or relating to hydraulic pit props

Info

Publication number
GB802803A
GB802803A GB35218/55A GB3521855A GB802803A GB 802803 A GB802803 A GB 802803A GB 35218/55 A GB35218/55 A GB 35218/55A GB 3521855 A GB3521855 A GB 3521855A GB 802803 A GB802803 A GB 802803A
Authority
GB
United Kingdom
Prior art keywords
bore
prop
hydraulic pit
plunger
bores
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
GB35218/55A
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
Application filed by Mastabar Mining Equipment Co Ltd filed Critical Mastabar Mining Equipment Co Ltd
Publication of GB802803A publication Critical patent/GB802803A/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)
  • Actuator (AREA)
  • Safety Valves (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
  • Control Of Presses (AREA)
  • Emergency Lowering Means (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

802,803. Hydraulic pit props. MASTABAR MINING EQUIPMENT CO., Ltd., [formerly MASTABAR BELT FASTENER CO., Ltd.]. Nov. 21, 1956 [Dec. 8, 1955], No. 35218/55. Class 20(2) [Also in Group XXIX] A hydraulic pit prop has a torsion spring loading a relief valve attached to a spring loaded member which can be operated externally. Turning of the shaft 31, Fig. 1, reciprocates the pistons 25 and 22 by way of the connecting rod 28 so as to raise the upper prop 17 by pumping oil from the reservoir into the space 50 (via the bore 47, chamber 43, bore 42, cylinder 21 and bore 48). External adjustment of eye 71 (by lanyard or during extension by the wedge ended cam 73) controls valves 57 and 53, Fig. 3, via plunger 67, Fig. 1, torsion bar, spring 61 and arm 62, collapse of the prop being effected by escape of oil from space 50 to the reservoir via bores 55, 56, pig. 3, and, with further movement of plunger 67, bores 51, 52. Operation of the -two - stage pump is described in Specification 802,804.
GB35218/55A 1955-06-10 1955-12-08 Improvements in or relating to hydraulic pit props Expired GB802803A (en)

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
GB802803A true GB802803A (en) 1958-10-15

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 Before (1)

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

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)

Families Citing this family (8)

* 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
NL299412A (en) * 1962-10-19
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
NL92057C (en) * 1953-09-24 1900-01-01

Also Published As

Publication number Publication date
BE553227A (en)
GB793803A (en) 1958-04-23
BE548513A (en)
DE1064907B (en) 1959-09-10
DE1063554B (en) 1959-08-20
FR1162002A (en) 1958-09-08
FR1151305A (en) 1958-01-29
US2895454A (en) 1959-07-21

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