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US 3,990,649 AGranted
Round nose tube
AssigneeSonoco Products Company
InventorHal M. Adams
Life of this patent
Estimating the term…
Abstract
A yarn carrier wherein at least one end of the tubular body member has a portion removed and the remaining thin end section is turned inwardly upon itself to provide a smooth, round nosed end on the tube and a straight, inside surface on the body wall.
Claims4
A method of forming a yarn carrier comprising the steps of:
- forming a cylindrical tubular preform from several plies of paper by spiral winding, removing a portion of the tubular wall on the inside of at least one end of said preform to provide a rabbet portion having a wall thickness of about one-half the wall thickness of the remainder of the preform, and inturning the rabbet wall by axially applying a rotating chuck to said end of the preform.
A cylindrical yarn carrier comprising:
- a tubular spiral wound cylindrical member having a wall formed of a plurality of plies of paper adhered to one another,
- at least one end of said member having a portion on the inside wall thereof removed to leave an annular interior shoulder and a thin upstanding wall portion,
- said thin wall portion being folded inwardly upon itself to provide a smooth round nosed end on said carrier, said carrier having a constant inside diameter from end to end, whereby a plurality of said yarn carriers may be mounted on a single spindle.
Dependencies are inferred from the claim text.