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253 



James Swinging Steel Crane 



SPECIFICATIONS 



Canier cranes being subject to considerable shock, unusual care has been taken to 

 give the James crane great rigidity to prevent buckling. The lateral and vertical strength 

 IS furnished by the horizontal and vertical trussed stiffening struts set at Irequenl intervals. 

 The crane is designed to carry 800 pounds when the load is at the maximum radius of 

 40 feet. 



Galvanized pipe (not merely painted), 2^-8-in. O. D., connected by heavy malleable 

 splice clamps; truss braces of I 5 j^-in. O. D. pipe. Truss struts of l^^-in. O. D. pipe 

 placed 1 20 degrees to each other. i hree side truss cables jVr"'"- '" diameter with Yi-m. 

 turnbuckles ; size and number of guy cables vary according to length of crane; with the 

 40-ft. crane four I'.y-in. and one %-in. cables are furnished, with necessary cable clips 

 and clamps. 



The hinge is of best malleable iron with I -in. diameter steel bolt. 



Hook bolt, 1 in. thick, with iron washer, special design, to prevent cables from unhook- 

 ing, lor attaching upper end of guy cables to barn. 



Removable Flexible Track Section 



Each swinging crane is furnished with a section of flexible track which is located 

 directly under the crane hinge. The flexible track is built up from 14 pieces of tempered 

 flat spring steel set on edge, carefully machined and assembled. All internal parts thor- 

 oughly coated with flake graphite and oil. 



This flexible track is eccentrically hung from crane hinge thus avoiding buckling. 



