FR56753E - metal prop - Google Patents

metal prop

Info

Publication number: FR56753E
Authority: FR; France
Prior art keywords: metal prop; prop; metal
Prior art date: 1947-04-11
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

Other languages

Inventor

Maurice Dardenne

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.)

1947-04-11

Filing date

1947-04-11

Publication date

1952-10-06

1947-04-11 Application filed filed Critical

1952-10-06 Application granted granted Critical

1952-10-06 Publication of FR56753E publication Critical patent/FR56753E/en

Status Expired legal-status Critical Current

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
- E21D15/16—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

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)

FR56753D 1947-04-11 1947-04-11 metal prop Expired FR56753E (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR56753T		1947-04-11

Publications (1)

Publication Number	Publication Date
FR56753E true FR56753E (en)	1952-10-06

Family

ID=8690907

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR56753D Expired FR56753E (en)	1947-04-11	1947-04-11	metal prop

Country Status (1)

Country	Link
FR (1)	FR56753E (en)

1947
- 1947-04-11 FR FR56753D patent/FR56753E/en not_active Expired

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