ZA703468B - Substituted jacking devices - Google Patents

Substituted jacking devices

Info

Publication number
ZA703468B
ZA703468B ZA703468A ZA703468A ZA703468B ZA 703468 B ZA703468 B ZA 703468B ZA 703468 A ZA703468 A ZA 703468A ZA 703468 A ZA703468 A ZA 703468A ZA 703468 B ZA703468 B ZA 703468B
Authority
ZA
South Africa
Prior art keywords
substituted
jacking devices
jacking
devices
substituted jacking
Prior art date
Application number
ZA703468A
Inventor
D Forbes
Original Assignee
D Forbes
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 D Forbes filed Critical D Forbes
Priority to ZA703468A priority Critical patent/ZA703468B/en
Priority to GB1443571*[A priority patent/GB1331805A/en
Priority to DE19712124675 priority patent/DE2124675A1/en
Priority to CA113,592A priority patent/CA942283A/en
Priority to US146104A priority patent/US3706441A/en
Publication of ZA703468B publication Critical patent/ZA703468B/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/008—Anchoring or tensioning means
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/066—Shores or struts; Chocks telescopic with parts held together by positive means by a wedge
    • 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
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/24—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism
    • E21D15/26—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism with screw, worm, or the like, not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure
ZA703468A 1970-05-22 1970-05-22 Substituted jacking devices ZA703468B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ZA703468A ZA703468B (en) 1970-05-22 1970-05-22 Substituted jacking devices
GB1443571*[A GB1331805A (en) 1970-05-22 1971-05-12 Jacking devices
DE19712124675 DE2124675A1 (en) 1970-05-22 1971-05-18 Mechanical lifting device
CA113,592A CA942283A (en) 1970-05-22 1971-05-21 Jacking devices
US146104A US3706441A (en) 1970-05-22 1971-05-24 Jacking devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA703468A ZA703468B (en) 1970-05-22 1970-05-22 Substituted jacking devices

Publications (1)

Publication Number Publication Date
ZA703468B true ZA703468B (en) 1971-11-24

Family

ID=25562003

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA703468A ZA703468B (en) 1970-05-22 1970-05-22 Substituted jacking devices

Country Status (5)

Country Link
US (1) US3706441A (en)
CA (1) CA942283A (en)
DE (1) DE2124675A1 (en)
GB (1) GB1331805A (en)
ZA (1) ZA703468B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2219902B1 (en) * 1973-03-01 1979-04-06 Svenska Rotor Maskiner Ab
GB2362871B (en) * 2000-01-26 2002-08-14 Thomas Finan Quick release jack
CA2416644C (en) * 2003-01-20 2010-07-20 Paul Gillespie Concrete slab form system
EP2787165B1 (en) * 2013-04-04 2016-11-16 Kern Tunneltechnik SA Support cylinder and formwork assembly with support cylinder
GB2526794B (en) * 2014-06-02 2018-12-05 Ischebeck Titan Ltd An assembly for the controlled release of a compression load

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1794798A (en) * 1927-05-02 1931-03-03 Hiram C Weitzman Jack
US1850489A (en) * 1929-05-10 1932-03-22 Baguley Cyril Prop for use in mines

Also Published As

Publication number Publication date
GB1331805A (en) 1973-09-26
DE2124675A1 (en) 1971-12-23
CA942283A (en) 1974-02-19
US3706441A (en) 1972-12-19

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