초록 ▼

A method and apparatus are disclosed for joining a plastic insert or component to a plastic base having a recess therein. The component is provided with integral projections thereon that are separated from one another by spaces. The component is inserted into the recess with the projections force-fi

A method and apparatus are disclosed for joining a plastic insert or component to a plastic base having a recess therein. The component is provided with integral projections thereon that are separated from one another by spaces. The component is inserted into the recess with the projections force-fitted against the plastic base. The plastic of projections is caused to flow into the spaces, and the plastic of the base is caused to flow into the spaces where the plastics are intermixed. Then, the flowed, intermixed plastics are brought back into a solid condition with spaces now filled with solid, intermixed plastics that interlock the components to the base against rotation relative to one another and to prevent them from being pulled apart. The preferred projections are spaced in rows and have inclined sidewalls extending outwardly to small, cross-sectional, free ends for rapidly melting and flowing into the spaces. The projections lose their shape and identity, and there is preferably no line of demarcation at the location of the former spaces between the component and plastic base.

대표청구항 ▼

An assembly of an insert integrally secured to a plastic base, the combination comprising: a recess formed in the plastic base; a plastic insert comprising a tubular body having a bore and outer tubular surface a discrete plurality of projections projecting from the tubular surface and spaces formed

An assembly of an insert integrally secured to a plastic base, the combination comprising: a recess formed in the plastic base; a plastic insert comprising a tubular body having a bore and outer tubular surface a discrete plurality of projections projecting from the tubular surface and spaces formed about and between said projections; the plastic insert fitted into the recess of the base; and interlocking plastic portions on the insert tubular body and on the plastic base having been flowed together and solidified from the projections and the base fitting the spaces between projections with the projections having lost their shape and identity to interlock the base and insert to one another and to secure the insert against rotation and removal from the plastic base.