GB815578A - Improvements in hydraulic pit props - Google Patents

Improvements in hydraulic pit props

Info

Publication number
GB815578A
GB815578A GB1341856A GB1341856A GB815578A GB 815578 A GB815578 A GB 815578A GB 1341856 A GB1341856 A GB 1341856A GB 1341856 A GB1341856 A GB 1341856A GB 815578 A GB815578 A GB 815578A
Authority
GB
United Kingdom
Prior art keywords
ram
cap
cylinder
hydraulic pit
engage
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
GB1341856A
Inventor
Alec Hodkinson
Joseph Alexander Wallace Mills
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.)
Dowty Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment Ltd
Filing date
Publication date
Priority to BE557125D priority Critical patent/BE557125A/xx
Application filed by Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Priority to FR1187688D priority patent/FR1187688A/en
Priority to DED25535A priority patent/DE1037991B/en
Publication of GB815578A publication Critical patent/GB815578A/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
    • E21D15/50—Component parts or details of props
    • E21D15/54—Details of the ends of props
    • E21D15/55—Details of the ends of props of prop heads or feet
    • 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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props

Abstract

815,578. Hydraulic pit props. DOWTY MINING EQUIPMENT Ltd. April 23, 1957 [May 1, 1956], No. 13418/56. Class 20(2) An hydraulic pit prop having a cylinder 10 and a ram 14 has a cap 23 to engage the mine roof and a strut 25 fitting the ram and adapted to engage the cylinder 10 near the limit of inward movement of the ram and transmit the load of the mine roof directly to the cylinder. The cap is secured on the ram by means of a bolt 29 which curves round the ram and may be exchanged for a cap with a longer skirt. A hand grip 34 is provided on the cap.
GB1341856A 1956-05-01 1956-05-01 Improvements in hydraulic pit props Expired GB815578A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE557125D BE557125A (en) 1956-05-01
FR1187688D FR1187688A (en) 1956-05-01 1957-04-30 Improvements to hydraulic props for mines
DED25535A DE1037991B (en) 1956-05-01 1957-05-02 Hydraulic pit ram

Publications (1)

Publication Number Publication Date
GB815578A true GB815578A (en) 1959-07-01

Family

ID=1727575

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1341856A Expired GB815578A (en) 1956-05-01 1956-05-01 Improvements in hydraulic pit props

Country Status (1)

Country Link
GB (1) GB815578A (en)

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