GB809056A - Improvements in or relating to telescopic pit-props - Google Patents

Improvements in or relating to telescopic pit-props

Info

Publication number
GB809056A
GB809056A GB8154/57A GB815457A GB809056A GB 809056 A GB809056 A GB 809056A GB 8154/57 A GB8154/57 A GB 8154/57A GB 815457 A GB815457 A GB 815457A GB 809056 A GB809056 A GB 809056A
Authority
GB
United Kingdom
Prior art keywords
clamp
props
prop
pit
relating
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
GB8154/57A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB809056A publication Critical patent/GB809056A/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
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/32—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring
    • E21D15/325—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring by a clamping ring

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)
  • Clamps And Clips (AREA)

Abstract

809,056. Pit props. GERLACH, K., and GERLACH, H. March 12, 1957 [March 19, 1956], No. 8154/57. Class 20(2) The clamp 4 of a telescopic pit prop has overlapping lugs 8, 9 alternating with one another and engaging the prop inner member 3 to bridge the gap in the clamp. The clamp 4 may be divided into two parts horizontally by a slat so that the upper part is carried down slightly as the prop telescopes and increases the clamping effect. Metal is die-pressed in flat form then bent to form the clamp.
GB8154/57A 1956-03-19 1957-03-12 Improvements in or relating to telescopic pit-props Expired GB809056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE809056X 1956-03-19

Publications (1)

Publication Number Publication Date
GB809056A true GB809056A (en) 1959-02-18

Family

ID=6723225

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8154/57A Expired GB809056A (en) 1956-03-19 1957-03-12 Improvements in or relating to telescopic pit-props

Country Status (1)

Country Link
GB (1) GB809056A (en)

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