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

1986-12-02

1989-02-21

Castel, Benoit

Stock material or miscellaneous articles

Two dimensionally sectional layer

Sections connected flexibly with external fastener

428 54, 428131, 264251, 2643288, 26432812, 425117, 425122, 425233, B29C 3342

Patent

active

048064050

ABSTRACT:
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 restrictions 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 resulting from shrinkage during the cooling and solidifying cannot shift the balls or links even if the latter are not yet completely solidified internally. Thus, errors in the on-center spacing between adjacent links are avoided.

REFERENCES:
patent: 2920354 (1960-01-01), Zumbrunnen
patent: 4152798 (1979-05-01), Akaura et al.
patent: 4176149 (1979-11-01), Moertez
patent: 4636347 (1987-01-01), Kato

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