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US 12,491,671 B2Granted
Method of manufacturing a two-wheeler frame
AssigneePlastic Innovation GmbH
InventorsUmut Cakmak, Christian Wolfsberger
Life of this patent
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Abstract
The invention relates to an injection molding method of manufacturing a two-wheeler frame in which a melt of a thermoplastic is injected into a cavity of an injection molding tool before a portion of the plastic melt is displaced from the cavity again by a subsequent fluid injection to form the inner hollow space of the tubular frame, with the fluid flowing upward in the course of the displacement process.
Claims11
A method of manufacturing a two-wheeler frame having tubular frame components comprising at least a steering tube, a down tube, and chain stays, the method comprising:
- injecting a plastic melt of a thermoplastic into a cavity of an injection molding tool through at least one plastic injection point;
- and
- subsequently injecting a fluid into the cavity through at least two different fluid injection points disposed in different regions of the cavity corresponding to different tubular frame components to displace a portion of the plastic melt from the cavity and urge the portion of the plastic melt that is displaced out of the cavity through at least one outlet of the cavity, to form an inner hollow space of the tubular frame components;
- wherein each of the at least two different fluid injection points is disposed at the injection molding tool below the at least one outlet and a shape of the cavity, a position of the at least one outlet, and a position of each of the at least two different fluid injection points are such that the fluid flows only in an upward direction in the cavity from each of the at least two different fluid injection points to the at least one outlet.
1 more element
Dependencies are inferred from the claim text.