GB1280899A - Improvements in hydraulic props - Google Patents

Improvements in hydraulic props

Info

Publication number
GB1280899A
GB1280899A GB47531/69A GB4753169A GB1280899A GB 1280899 A GB1280899 A GB 1280899A GB 47531/69 A GB47531/69 A GB 47531/69A GB 4753169 A GB4753169 A GB 4753169A GB 1280899 A GB1280899 A GB 1280899A
Authority
GB
United Kingdom
Prior art keywords
chamber
check valve
section
pressure fluid
fluid fed
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
GB47531/69A
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.)
Gewerkschaft Eisenhutte Westfalia GmbH
Original Assignee
Gewerkschaft Eisenhutte Westfalia 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
Priority claimed from DE19691931627 external-priority patent/DE1931627C3/en
Application filed by Gewerkschaft Eisenhutte Westfalia GmbH filed Critical Gewerkschaft Eisenhutte Westfalia GmbH
Publication of GB1280899A publication Critical patent/GB1280899A/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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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

Abstract

1280899 Hydraulic pit props GEWERKSCHAFT EISENHUTTE WESTFALIA 26 Sept 1969 [21 June 1969] 47531/69 Heading E1P In a hydraulic pit prop of the multi-stage type having inner sections 3, 2 advanced in sequence by pressure fluid fed to a chamber 8 and thence through a check valve 5, to a chamber 7, the section 3 is first retracted by pressure fluid fed to a robbing chamber 13 whereupon a check valve 6 is operated to allow the section 2 to be retracted under its own weight or by manual means.
GB47531/69A 1969-06-21 1969-09-26 Improvements in hydraulic props Expired GB1280899A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691931627 DE1931627C3 (en) 1969-06-21 Hydraulic telescopic ram

Publications (1)

Publication Number Publication Date
GB1280899A true GB1280899A (en) 1972-07-05

Family

ID=5737686

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47531/69A Expired GB1280899A (en) 1969-06-21 1969-09-26 Improvements in hydraulic props

Country Status (4)

Country Link
US (1) US3656411A (en)
JP (1) JPS4923441B1 (en)
FR (1) FR2030920A5 (en)
GB (1) GB1280899A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760704A (en) * 1971-12-30 1973-09-25 Polaroid Corp Reflex camera and viewer with a folded optical path
US3961559A (en) * 1974-11-18 1976-06-08 Hiroshi Teramachi Actuator
JPS5293669U (en) * 1976-01-12 1977-07-13
JPS56160449U (en) * 1980-04-30 1981-11-30
US4516468A (en) * 1983-01-10 1985-05-14 Hydraulic Technology Corporation Double acting telescopic cylinder construction
JPS6143865U (en) * 1984-08-23 1986-03-22 東一郎 柴山 flower pot
US5209154A (en) * 1990-11-08 1993-05-11 Allied-Signal Inc. Dual area brake actuation piston mechanism
US5953967A (en) * 1996-05-28 1999-09-21 Junkers; John Fluid-operated cylinder-piston unit, and a tool provided therewith
US5927178A (en) * 1997-11-24 1999-07-27 Diebolt International, Inc. Press driven tool actuator module
JP4262879B2 (en) * 2000-10-10 2009-05-13 カヤバ工業株式会社 Lift cylinder
US6557456B2 (en) * 2001-05-24 2003-05-06 The Raymond Corporation Cushioned actuator
CN101105133B (en) * 2007-07-27 2010-05-19 中国矿业大学 Double extension suspended type hydraulic vertical prop
CN101984220A (en) * 2010-05-28 2011-03-09 金湖小青青机电设备有限公司 Double flexible suspension hydraumatic upright column
CN105020197A (en) * 2015-07-24 2015-11-04 芜湖市银鸿液压件有限公司 Composite type bidirectional hydraulic dam ascending oil cylinder and use method thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2172117A (en) * 1938-05-02 1939-09-05 John M Beaufort Radio antenna
US2378409A (en) * 1942-03-18 1945-06-19 Joseph F Joy Hydraulic elevating mechanism
US2517153A (en) * 1946-08-16 1950-08-01 Gar Wood Ind Inc Telescopic power down hoist
US2813515A (en) * 1955-04-28 1957-11-19 Joy Mfg Co Telescopic uniform pressure providing apparatus
GB977800A (en) * 1962-08-21 1964-12-16 Electro Hydraulics Ltd Improvements in or relating to mine roof supports
BE655844A (en) * 1963-11-29 1965-03-16

Also Published As

Publication number Publication date
US3656411A (en) 1972-04-18
DE1931627B2 (en) 1977-06-30
FR2030920A5 (en) 1970-11-13
DE1931627A1 (en) 1971-01-07
JPS4923441B1 (en) 1974-06-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee