FR1045311A - steel prop for mines - Google Patents

steel prop for mines

Info

Publication number: FR1045311A
Authority: FR; France
Prior art keywords: mines; steel prop; prop; steel
Prior art date: 1949-12-13
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

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.)

Ringfeder GmbH

Original Assignee

Ringfeder GmbH

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.)

1949-12-13

Filing date

1949-12-13

Publication date

1953-11-25

1949-12-13 Application filed by Ringfeder GmbH filed Critical Ringfeder GmbH

1953-11-25 Application granted granted Critical

1953-11-25 Publication of FR1045311A publication Critical patent/FR1045311A/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
- E21D15/28—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

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)

FR1045311D 1949-12-13 1949-12-13 steel prop for mines Expired FR1045311A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR1045311T		1949-12-13

Publications (1)

Publication Number	Publication Date
FR1045311A true FR1045311A (en)	1953-11-25

Family

ID=9591603

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR1045311D Expired FR1045311A (en)	1949-12-13	1949-12-13	steel prop for mines

Country Status (1)

Country	Link
FR (1)	FR1045311A (en)

1949
- 1949-12-13 FR FR1045311D patent/FR1045311A/en not_active Expired

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