GB720453A - Iron pit props - Google Patents

Iron pit props

Info

Publication number
GB720453A
GB720453A GB31540/52A GB3154052A GB720453A GB 720453 A GB720453 A GB 720453A GB 31540/52 A GB31540/52 A GB 31540/52A GB 3154052 A GB3154052 A GB 3154052A GB 720453 A GB720453 A GB 720453A
Authority
GB
United Kingdom
Prior art keywords
band
wedges
lugs
lock
clamped
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
GB31540/52A
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 GB720453A publication Critical patent/GB720453A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • E21D15/28—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

Abstract

720,453. Pit props. ZINDEL, W. Dec. 12, 1952 [Feb. 26. 1952], No. 31540/52. Class 20(2). A telescopic pit prop comprises a lower part 10, Fig. 2, of cruciform section and a tubular upper part 11 which rests on a clamping lock formed as an independent component adapted to be clamped in any position on the lower part 10, the lock comprising a conical clamping band 13 embracing angle section wedge pieces 12 which fit in the angles of the lower part 10. The ends of the band 13 are formed with outwardly turned lugs which are clamped together by nut and bolt, or by a tapered sleeve 24, Fig. 5 or 6, which engages over the lugs 22 and is moved downwardly or upwardly to tension or release the band 13 by means of wedges 25, 26, 26a, Fig. 5, or wedges 25a, 30, 31, Fig. 6. Rollers 36, Fig. 2, may be interposed between the edges of the wedges 12 and the band 13 to reduce the friction between the wedges and band.
GB31540/52A 1952-02-26 1952-12-12 Iron pit props Expired GB720453A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE720453X 1952-02-26

Publications (1)

Publication Number Publication Date
GB720453A true GB720453A (en) 1954-12-22

Family

ID=6628067

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31540/52A Expired GB720453A (en) 1952-02-26 1952-12-12 Iron pit props

Country Status (1)

Country Link
GB (1) GB720453A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104775838A (en) * 2015-05-07 2015-07-15 山东科技大学 Self-adapting corrosion-proof anchor rod

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104775838A (en) * 2015-05-07 2015-07-15 山东科技大学 Self-adapting corrosion-proof anchor rod

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