ATTORNEYS March 6, 1951 T
Mareh 6, 1951 T. o. DAVIDSON ETAL 2,543,765 wmcn FOR convsmmua DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 1 BY 4' ATTORNEYS March 6, 1951 T. o. DAVIDSON ETAL 2,543,765 wmcu FOR CONVERTIBLE DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 2 .59 4/40 .75 ' ATTORAGE‘Yi March 6, 1951 T. o. DAVIDSON ET AL 2,543,755 WINCH FOR CQNVERTIBLE DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 3 76 ‘32 74 74 49 7 £3 47 62 II:- I: W 7a’ 3 74 74 1 686.5’ 69 50 v’ 48 J2 49 a a 5/ H , l ' éz‘; I 59,-. ism"? 7’ ATTORNEY-5' March 6, 1951 'r. o. DAVIDSON ETAL 2,543,765 WINCH FOR CONVERTIBLE DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 4 ATTORNEY.’ March 6, 1951 ‘r. o. DAVIDSON ETAL 2,543,755 wmcu FOR convaansus DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 5 M “amid/4m. mmvroas, 2% 2,5 ‘ ATTORNEY. March 6, 1951 -r. o. DAVIDSON ETAL 2,543,765 wmcn FOR convamxau-z nmcu‘m-zs AND SHOVELS AZTORJVEYI Patented Mar. 6, 1951 2,543,765 UNITED STATES PATENT OFFICE 2,543,765 WINCH FOR CONVERTIBLE DRAGLINES AND SHOVELS Trevor 0. Davidson, Milwaukee, and Bruno L. Lonngren, South Milwaukee, Wis., assignors to Bucyrus-Erie Company, South Milwaukee, Wis., a corporation of Delaware . Application February 5, 1947, Serial No. 726,570 19 Claims. (CL 254—185) 1 Our invention relates to new and useful im Rope thrusting eliminates the need of a boom provements in the control of thrusting and hoist engine to drive the shipper shaft, and thus not ing functions of power shovels, and the control only thereby reduces the weight on the boom, ' of dragging and hoisting functions of draglines but also reduces the weight of the boom itself by more particularly power shovels and draglines of enabling it to be built lighter.
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