Forfatter: A.-M.Inst.C E., George Frederick Zimmer
År: 1916
Forlag: Crosby Lockwood and Son
Sted: London
Sider: 752
UDK: 621.87 Zim, 621.86 Zim
Being a Treatise on the Handling and Storing of Material such as Grain, Coal, Ore, Timber, Etc., by Automatic or Semi-Automatic Machinery, together with the Various Accessories used in the Manipulation of such Plant
568
THE MECHANICAL HANDLING OF MATERIAL
reached the top of the frame, the current is automatically cut off by an arrangement on
the second countershaft. During the lowering of the cradle the weights on the band
Figs. 797 and 798. Diagrams showing Method of Raising and Lowering the Craldle.
brakes are lifted by a small electro-motor. The gear of the brake is also fitted with a
dashpot so as to ensure the brake action being smooth when thrown in or out of gear.
The winding drum has, in addition to the grooves for the two rope ends, a third groove for
a smaller rope for the purpose of pulling the cradle down should repairs be needed, or for
Figs. 799 to 801. Winch for Tipping the Cradle.
trial purposes, supposing the cradle should have to be lowered without a wagon on it.
This rope is not usually on the drum, but is only put on in case of emergencies, as the
cradle being practically balanced, will not descend without an empty truck. All bearings