Title:
Roof bolt with a flexible tension member and cup-shaped expansible securing means
United States Patent 3077809
Inventors:
Frederick, Harding Denys
Edward, Campbell Robert
John, Baker
Application Number:
US81647659A
Publication Date:
02/19/1963
Filing Date:
05/28/1959
Assignee:
BRITISH ROPES LTD
Primary Class:
Other Classes:
405/302.2, 411/383, 411/392
International Classes:
E21D11/00; E21D21/00
View Patent Images:
US Patent References:
2970444Expanding wedge type cable or bolt anchor1961-02-07
2129439Anchoring means1938-09-06
1643110Attachment for wire rope and process for producing the same1927-09-20
1434394Expansion bolt1922-11-07
1278025N/A1918-09-03
1031462N/A1912-07-02
0861573N/A1907-07-30
0179237N/A1876-06-27
0036014N/A1862-07-29
Foreign References:
DE1005474B1957-04-04