GB433220A - Improvements in pit props - Google Patents

Improvements in pit props

Info

Publication number
GB433220A
GB433220A GB4603/34A GB460334A GB433220A GB 433220 A GB433220 A GB 433220A GB 4603/34 A GB4603/34 A GB 4603/34A GB 460334 A GB460334 A GB 460334A GB 433220 A GB433220 A GB 433220A
Authority
GB
United Kingdom
Prior art keywords
chamber
valve
prop
chambers
pressure
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
GB4603/34A
Other languages
English (en)
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.)
HUGO SCHRAMM
Original Assignee
HUGO SCHRAMM
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 HUGO SCHRAMM filed Critical HUGO SCHRAMM
Publication of GB433220A publication Critical patent/GB433220A/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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props

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)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Actuator (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
GB4603/34A 1933-02-10 1934-02-12 Improvements in pit props Expired GB433220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE433220X 1933-02-10

Publications (1)

Publication Number Publication Date
GB433220A true GB433220A (en) 1935-08-12

Family

ID=6498306

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4603/34A Expired GB433220A (en) 1933-02-10 1934-02-12 Improvements in pit props

Country Status (3)

Country Link
BE (1) BE401341A (enrdf_load_stackoverflow)
FR (1) FR768419A (enrdf_load_stackoverflow)
GB (1) GB433220A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106894832A (zh) * 2017-04-25 2017-06-27 辽宁工程技术大学 一种金属切削式吸能防冲液压立柱

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE941541C (de) * 1952-04-09 1956-04-12 Eisenwerk Wanheim G M B H Verstellbarer metallischer Grubenstempel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106894832A (zh) * 2017-04-25 2017-06-27 辽宁工程技术大学 一种金属切削式吸能防冲液压立柱

Also Published As

Publication number Publication date
BE401341A (enrdf_load_stackoverflow)
FR768419A (fr) 1934-08-06

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