Cross-traverse motion of crab and longitudinal travel motion of whole crane often arranged without brake for retarting motion after cutting off current supply from motors; maximum permissible speeds relative to maximum distances of travel at which these motions can be safely carried out; if longitudinal-travel speed exceeds 250 ft. per min. brake should be fitted; 200 ft. per. min. is maximum speed at which brake is unnecessary.
Travelling motions without brakes on overhead electric cranes
Mech. World
Mechanical World ; 83 , n 2149
1928
2 pages
1 Fig.
Article (Journal)
English
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