US2638075A - Pneumatically controlled hydraulic prop - Google Patents

Pneumatically controlled hydraulic prop Download PDF

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Publication number
US2638075A
US2638075A US130839A US13083949A US2638075A US 2638075 A US2638075 A US 2638075A US 130839 A US130839 A US 130839A US 13083949 A US13083949 A US 13083949A US 2638075 A US2638075 A US 2638075A
Authority
US
United States
Prior art keywords
hydraulic
prop
ram
cylinder
pneumatic
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 - Lifetime
Application number
US130839A
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English (en)
Inventor
Towler John Maurice
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.)
Mavor and Coulson Ltd
Original Assignee
Mavor and Coulson 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 Mavor and Coulson Ltd filed Critical Mavor and Coulson Ltd
Application granted granted Critical
Publication of US2638075A publication Critical patent/US2638075A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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 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

Definitions

  • Y Ari-'exampleroffayhydraulicgprop embodying the invention is.;shown,.finf.thenaccompanyng'I-draw- .,ings,I.in whichfEig. 1,;isia yertealwsectiorrishowing .the prop in tsinormally extended state-,rand'igi 2 is a vertical sectionshowing;:theaprpptasiitsstarts .,toicontract.
  • theicylinderio .-,theihydraulic ,cylinder-.anderam ,assembly iscdenotedrbw laand the rain.I ist clenoteduhya 2.
  • .Lina,thenexampletithe hydraulic cylinder I is thellowe componentzof .the prop..Yand'ethe,hydrauiica:1:amr.2.isutthezillpper ⁇ component.
  • the pneumatic controledeyice includes a ⁇ rig- 5 -fidly f stationary 'Iramccmprising ⁇ la composite frod that 'consists of 'inner and outer eze-axial 'tubes Il fandflEI-:securedfto' the hydraulic cylinderf'oase NFA@ and a'piston I3Iat1the top'of both tubes.
  • the outer ⁇ tube ⁇ I 2 has' a sealingI sliding itthroughthe fgl-anclfId .IinIthehyiirenilicrarnr I:bottom l.
  • check-varient is* anonreturnfvalve, which 'normallyiis ⁇ -kept" tightly closed” against Y,its :seat
  • the ,check .I yaiye.- 5 isintted ⁇ with .a.,.no.rmaily Lclosed, springgpressed, auxiliary .non-return yalve 2L Which canbe opened by,thpnenmaticcyh .inder' HI.
  • the pneumatic device II-to Il! is suppliedirom can external source of .a compressed... air ...through anmappropriate controlyalye (not. shown) ,in
  • the check valve closes under the influence of its spring and locks inside the hydraulic cylinder l the oil filling it.
  • the pressure inside the hydraulic cylinder may now increase to any extent (say, under subsidence of the mine roof B) as far as the limit for which the relief valve is set, without any contraction whatsoever of the prop.
  • Another yadvantage of the improved prop is that, once it is set in position, it is independent i prising a hydraulic cylinder-and-ram of external power and therefore of diiliculties due to failure of power supply, burst pipes, leaky connections and valves, and broken fittings.
  • Another advantage is that the hydraulic valves and working parts Iand the hydraulic connections are all housed in the interior of the prop, where they are safe from damage and dirt.
  • auxiliary valve 24 By virtue of the auxiliary valve 24, it is enprop is being contracted there is an initial period, which need only be of brief duration, during which the pressure on the roof B is reduced gradually. Once that period has passed, the prop is rapidly contracted.
  • the arrangement is such that this sequence of operations occurs automatically, being out of the control of the operator.
  • An extensible and contractible prop according to claim l including also an auxiliary nonreturn valve carried by the ram and arranged to co-operate with said pneumatic control device, being engageable ⁇ by said device to open in advance oi' the check valve and pass the hydraulic duid from-one of said components to the other at a restricted rate.
  • An extensible and contractible lprop according to claim 1 including also a lever fulcrummed on the hollow ram and interposed between the pneumatic control device and the check valve,
US130839A 1948-03-06 1949-12-02 Pneumatically controlled hydraulic prop Expired - Lifetime US2638075A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7017/48A GB640414A (en) 1948-03-06 1948-03-06 Improvements in props

Publications (1)

Publication Number Publication Date
US2638075A true US2638075A (en) 1953-05-12

Family

ID=9825052

Family Applications (1)

Application Number Title Priority Date Filing Date
US130839A Expired - Lifetime US2638075A (en) 1948-03-06 1949-12-02 Pneumatically controlled hydraulic prop

Country Status (5)

Country Link
US (1) US2638075A (de)
DE (1) DE872192C (de)
FR (1) FR1001031A (de)
GB (1) GB640414A (de)
NL (1) NL71059C (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830563A (en) * 1954-03-26 1958-04-15 Burton B Burckhalter Automatic jack leg
US2895454A (en) * 1955-06-10 1959-07-21 Mastabar Mining Equip Co Ltd Props, especially for use in coal mines
US2970577A (en) * 1958-01-28 1961-02-07 Anderson Clayton & Co Hydraulic lift
US2984000A (en) * 1957-05-01 1961-05-16 Taylor Wilson Mfg Company Pipe coupling screw-on machine controls
US3000358A (en) * 1959-02-23 1961-09-19 Dowty Mining Equipment Ltd Hydraulic props or struts
US3046947A (en) * 1959-08-21 1962-07-31 Acrow Eng Ltd Hydraulic props
US3112676A (en) * 1959-06-16 1963-12-03 Amalgamated Dental Co Ltd Hoist
DE977481C (de) * 1953-09-24 1966-08-18 Dowty Mining Equipment Ltd In einem hydraulisch betaetigten Grubenstempel eingebaute Kolbenpumpe
DE1279908B (de) * 1965-12-27 1968-10-10 Caterpillar Tractor Co Doppeltwirkender hydraulischer Hubzylinder mit beidseitig aus dem Kolben hervorstehenden Ventilspindeln
US3415342A (en) * 1967-06-28 1968-12-10 Joyce Cridland Co Vehicle lifting apparatus
US3415159A (en) * 1964-11-14 1968-12-10 Reinhard Hornlein K G Fluid-operated extendable and contractable arrangement
US3693500A (en) * 1970-06-01 1972-09-26 Gilbert & Barker Mfg Co Fluid pressure controlled power unit
US4281585A (en) * 1978-03-13 1981-08-04 The Bendix Corporation Hydraulic brake booster and valve member
US5516070A (en) * 1990-10-01 1996-05-14 Leonard Studio Equipment, Inc. Camera pedestal drive column
US20080314689A1 (en) * 2007-06-23 2008-12-25 Herrmann Ag Lifting platform for vehicles and other objects
WO2009067962A1 (de) * 2007-11-27 2009-06-04 Bochumer Eisenhütte Heintzmann GmbH & Co. KG Ausbaustütze für den untertägigen berg- und tunnelbau
US20130193626A1 (en) * 2012-01-31 2013-08-01 Alphonso Woodburn Adjustable height turntable device

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973341C (de) * 1951-03-13 1960-01-28 Ewald Wiemann Maschf Ventil fuer hydraulische Grubenstempel
DE1023435B (de) * 1951-06-09 1958-01-30 Eisenwerk Wanheim G M B H Hydraulischer Grubenstempel
DE1078516B (de) * 1956-07-17 1960-03-31 Bwg Bergwerk Walzwerk Nachgiebiger hydraulischer Grubenstempel
DE1089349B (de) * 1957-04-15 1960-09-22 Hermann Schwarz Kommanditgesel Mehrteiliges Stuetzelement fuer den Grubenausbau
DE1143469B (de) * 1957-07-30 1963-02-14 Gewerk Eisenhuette Westfalia Ventil zur Steuerung hydraulicher Ausbaugestelle fuer bergmaennische Gewinnungsbetriebe
DE1193458B (de) * 1958-08-11 1965-05-26 Dobson Ltd W E & F Wandernder Grubenausbau
DE1168849B (de) * 1958-10-30 1964-04-30 Wilhelm Steinkopf Hydraulischer Grubenstempel
DE1244092B (de) * 1963-08-17 1967-07-13 Glueckauf Guenther Klerner Mas Sicherungsvorrichtung fuer die Abspannvorrichtung eines Strebfoerderers
DE1229966B (de) * 1964-06-25 1966-12-08 Hoesch Bergbautechnik G M B H Doppeltwirkender hydraulischer Grubenstempel
FR2300894A1 (fr) * 1975-02-12 1976-09-10 Bennes Marrel Dispo
FR2358412A1 (fr) * 1976-07-13 1978-02-10 Parcor Procede de preparation de la vincamine et d'alcaloides apparentes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US250103A (en) * 1881-11-29 reynolds
US1299668A (en) * 1918-04-10 1919-04-08 August Blomquist Air lifting-jack.
US1797297A (en) * 1931-03-24 Begtrlating vaiate
US1899534A (en) * 1930-05-05 1933-02-28 Curtis Mfg Co Automobile lift
US2085961A (en) * 1929-04-03 1937-07-06 John G Dorward Hydraulic lift
US2336808A (en) * 1941-11-21 1943-12-14 Globe Hoist Co Hydraulic hoist

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE621526C (de) * 1933-02-10 1935-11-08 Hugo Schramm Aus zwei ineinanderverschiebbaren Teilen bestehender nachgiebiger Grubenstempel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US250103A (en) * 1881-11-29 reynolds
US1797297A (en) * 1931-03-24 Begtrlating vaiate
US1299668A (en) * 1918-04-10 1919-04-08 August Blomquist Air lifting-jack.
US2085961A (en) * 1929-04-03 1937-07-06 John G Dorward Hydraulic lift
US1899534A (en) * 1930-05-05 1933-02-28 Curtis Mfg Co Automobile lift
US2336808A (en) * 1941-11-21 1943-12-14 Globe Hoist Co Hydraulic hoist

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977481C (de) * 1953-09-24 1966-08-18 Dowty Mining Equipment Ltd In einem hydraulisch betaetigten Grubenstempel eingebaute Kolbenpumpe
US2830563A (en) * 1954-03-26 1958-04-15 Burton B Burckhalter Automatic jack leg
US2895454A (en) * 1955-06-10 1959-07-21 Mastabar Mining Equip Co Ltd Props, especially for use in coal mines
US2984000A (en) * 1957-05-01 1961-05-16 Taylor Wilson Mfg Company Pipe coupling screw-on machine controls
US2970577A (en) * 1958-01-28 1961-02-07 Anderson Clayton & Co Hydraulic lift
US3000358A (en) * 1959-02-23 1961-09-19 Dowty Mining Equipment Ltd Hydraulic props or struts
US3112676A (en) * 1959-06-16 1963-12-03 Amalgamated Dental Co Ltd Hoist
US3046947A (en) * 1959-08-21 1962-07-31 Acrow Eng Ltd Hydraulic props
US3415159A (en) * 1964-11-14 1968-12-10 Reinhard Hornlein K G Fluid-operated extendable and contractable arrangement
DE1279908B (de) * 1965-12-27 1968-10-10 Caterpillar Tractor Co Doppeltwirkender hydraulischer Hubzylinder mit beidseitig aus dem Kolben hervorstehenden Ventilspindeln
US3415342A (en) * 1967-06-28 1968-12-10 Joyce Cridland Co Vehicle lifting apparatus
US3693500A (en) * 1970-06-01 1972-09-26 Gilbert & Barker Mfg Co Fluid pressure controlled power unit
US4281585A (en) * 1978-03-13 1981-08-04 The Bendix Corporation Hydraulic brake booster and valve member
US5516070A (en) * 1990-10-01 1996-05-14 Leonard Studio Equipment, Inc. Camera pedestal drive column
US5820088A (en) * 1990-10-01 1998-10-13 Chapman/Leonard Studio Equipment, Inc. Camera pedestal drive column
US20080314689A1 (en) * 2007-06-23 2008-12-25 Herrmann Ag Lifting platform for vehicles and other objects
US8684141B2 (en) * 2007-06-23 2014-04-01 Herrmann Ag Lifting platform for vehicles and other objects
WO2009067962A1 (de) * 2007-11-27 2009-06-04 Bochumer Eisenhütte Heintzmann GmbH & Co. KG Ausbaustütze für den untertägigen berg- und tunnelbau
US20090202310A1 (en) * 2007-11-27 2009-08-13 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Support for underground mining and tunnel construction
GB2467871A (en) * 2007-11-27 2010-08-18 Bochumer Eisen Heintzmann Lining support for underground mining and tunneling
US20130193626A1 (en) * 2012-01-31 2013-08-01 Alphonso Woodburn Adjustable height turntable device

Also Published As

Publication number Publication date
NL71059C (de) 1952-10-15
GB640414A (en) 1950-07-19
DE872192C (de) 1953-03-30
FR1001031A (fr) 1952-02-19

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