GB746862A - Improvements in hydraulic pit props - Google Patents

Improvements in hydraulic pit props

Info

Publication number
GB746862A
GB746862A GB2455453A GB2455453A GB746862A GB 746862 A GB746862 A GB 746862A GB 2455453 A GB2455453 A GB 2455453A GB 2455453 A GB2455453 A GB 2455453A GB 746862 A GB746862 A GB 746862A
Authority
GB
United Kingdom
Prior art keywords
spring
hydraulic
valve
hydraulic pit
sept
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
GB2455453A
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.)
WILLIAM RICHARDS PRICE
Dowty Hydraulic Units Ltd
Original Assignee
WILLIAM RICHARDS PRICE
Dowty Hydraulic Units 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 WILLIAM RICHARDS PRICE, Dowty Hydraulic Units Ltd filed Critical WILLIAM RICHARDS PRICE
Priority to GB2455453A priority Critical patent/GB746862A/en
Priority to DED18600A priority patent/DE970492C/en
Publication of GB746862A publication Critical patent/GB746862A/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
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Check Valves (AREA)
  • Safety Valves (AREA)

Abstract

746,862. Hydraulic pit props. DOWTY HYDRAULIC UNITS, Ltd., [formerly DOWTY AUTO UNITS, Ltd.], and PRICE, W. R. Sept. 1, 1954 [Sept. 4, 1953], No. 24554/53. Class 20(2). [Also in Group XXIX] In a hydraulic pit prop a preset relief valve 35 is loaded by a spring 39 to seat upon a release valve in the form of a removable capsule 26 which is retained in an operative position in valve housing 21 by a cap 30 cooperating with a spring 29. To collapse the prop, the capsule 26 is lifted from a seat 28 in the valve housing 21, against the spring 29, by an externally operable cam 46. The loading of the relief valve is determined by shims placed between the spring 39 and one of its abutments.
GB2455453A 1953-09-04 1953-09-04 Improvements in hydraulic pit props Expired GB746862A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2455453A GB746862A (en) 1953-09-04 1953-09-04 Improvements in hydraulic pit props
DED18600A DE970492C (en) 1953-09-04 1954-09-05 Pressure reducing valve for a hydraulically operated pit ram

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2455453A GB746862A (en) 1953-09-04 1953-09-04 Improvements in hydraulic pit props

Publications (1)

Publication Number Publication Date
GB746862A true GB746862A (en) 1956-03-21

Family

ID=10213452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2455453A Expired GB746862A (en) 1953-09-04 1953-09-04 Improvements in hydraulic pit props

Country Status (2)

Country Link
DE (1) DE970492C (en)
GB (1) GB746862A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1062654B (en) * 1956-04-03 1959-08-06 Kloeckner Bergbau Viktor Icker Hydraulic pit ram

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE486663A (en) * 1948-01-12
DE872191C (en) * 1951-01-09 1953-03-30 Gutehoffnungshuette Oberhausen Hydraulic pit ram
DE887784C (en) * 1951-01-25 1953-08-27 Eisenwerk Wanheim G M B H Hydraulic pit ram
DE928945C (en) * 1951-06-09 1955-06-16 Eisenwerk Wanheim G M B H Adjustable hydraulic pit ram
DE922525C (en) * 1952-04-26 1955-01-17 Eisenwerk Wanheim G M B H Hydraulic pit ram

Also Published As

Publication number Publication date
DE970492C (en) 1958-09-25

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