Conical bobbin and method of forming same
OwnerJean P. Briandinventor
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Abstract
A cone-shaped bobbin is formed by rolling and gluing a paper or the like blank on a mounting mandrel with the cone being formed with a decreasing number of layers of paper or the like from bottom to top. Three embodiments of the blank are disclosed respectively in the shape of a crescent, a half-crescent, and a comma.
Claims12
A cone shaped bobbin formed of a blank formed of paper or cardboard material comprising a first semi-circular edge and a second semi-circular edge, each of said semi-circular edges having the same curvature as the other semi-circular edge with said blank being wound in a helical arrangement in which the large edge of the cone contains a larger number of layers of the blank than does the small end of the cone and in which the number of layers of the blank material progressively decreases from the lower end to the upper end and adhesive means securing the layers of the blank together.
Dependencies are inferred from the claim text.