Method of making a plurality of toothed belt constructions

In a method of making a plurality of toothed belt means some of which have larger inside diameters than the inside diameters of the others, the method comprising the steps of disposing tubular sleeves of stretchable fabric material respectively onto a plurality of toothed mold members having different diameters, and forcing mold material against the outside surfaces of said sleeves to tend to stretch said fabric material into the grooves of said toothed mold members as said mold material enters the grooves of said mold members so that said resulting toothed belt means will have said fabric material thereof carried in certain positions relative to the respective teeth thereof, the improvement comprising the steps of forming said sleeves from the same fabric material and with the same diameters in the nonstretched conditions thereof, and forming said sleeves to each have a circumferential length in the fully stretched condition thereof that is at least twice the circumferential length in the nonstretched condition thereof so that the same is disposed substantially across the roots of the teeth of said toothed belt means when said mold member being utilized at that time has a diameter that substantially corresponds to the diameter of said sleeve in the fully stretched condition thereof and so that the same substantially lines the outer peripheral surfaces of the teeth of said toothed belt means when said mold member being utilized at that time has a diameter that substantially corresponds to the diameter of said sleeve in the nonstretched condition thereof.