Method and injection molding tool for producing link belts

Details Method and injection molding tool for producing link belts Method and injection molding tool for producing link belts

B - Operations, Transporting

29

C

18/681

B29C 49/14 (2006.01) B29C 45/14 (2006.01) B29C 45/26 (2006.01) B29C 45/27 (2006.01)

Patent

CA 1253309

TITLE OF THE INVENTION METHOD AND INJECTION MOLDING TOOL FOR PRODUCING LINK BELTS ABSTRACT OF THE DISCLOSURE A link chain or string is produced in an injection molding tool in such a way that a plurality of links threaded onto a string or cable are molded simultaneously, for example in the form of spheres. In order to avoid the transmission of axial forces to the links, which forces might disturb the axial spacings from link to link, the injection molding tool is provided with restric- tions which reduce the cross-sectional area of molten material flow channels to a minimum. Preferably, the restricted area is located directly at the respective link. The channels all lead to a common injection molding channel to which the molten material is supplied for thus simultaneously casting or molding of a plurality of links to strings or cables. The restrictions make sure that any forces result- ing from shrinkage during the cooling and solidifying cannot shift the balls or links even if the latter are not yet completely solid- ified internally. Thus, errors in the on-center spacing between adjacent links are avoided.

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