Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE386803ApublicationCriticalpatent/BE386803A/xx
B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
B23Q5/02—Driving main working members
B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
B23Q5/12—Mechanical drives with means for varying the speed ratio
B23Q5/14—Mechanical drives with means for varying the speed ratio step-by-step
