Patent ID: 7340822

Claim:
A method for manufacturing an insulator having first insulating members and second insulating members, which are arranged alternately, each first and second insulating members having circumferential ends, wherein each first insulating member includes through holes, which are formed on the circumferential ends of the first insulating member, and each second insulating member has coupling projections, which are formed on the circumferential ends of the second insulating member, the adjacent first and second insulating members being rotatably coupled when one of the coupling projections of the second insulating member is received by one of the through holes of the first insulating member, the through hole has a notch, which extends in the radial direction, each coupling projection has a hook at the distal end of the coupling projection, and the hook extends in the radial direction, and each adjacent pair of the first and second insulating members being located at a predetermined allowable angle relative to each another wherein each hook matches the corresponding notch as viewed in the axial direction so that each hook permits the corresponding coupling projection to be inserted into the corresponding through hole, the method comprising: molding a plurality of first and second insulating members using a mold such that the first and second insulating members are axially displaced from each other and the predetermined allowable angle is defined by each adjacent pair of the first and second insulating members; and coupling the adjacent first and second insulating members by axially moving either the first or second insulating members relative to the other one of the first and second insulating members in the mold while the first and second insulating members are located at the allowable angle thereby inserting each coupling projection into the corresponding through hole.