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 in a circular array with the projections being separated circumferentially from one another by spaces. The pr

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 in a circular array with the projections being separated circumferentially from one another by spaces. The projections are force-fitted against the plastic base. The plastic of projections is caused to flow circumferentially into the spaces, and the plastic of the base is caused to flow into the spaces where the plastics are melded together. Then the flowed, melded plastics are brought to a solid condition with spaces now filled with solid, melded plastics that interlock the components to the base against rotation relative to one another and to prevent them from being pulled apart. The preferred component is a boss. The boss may be inserted into a recess in the plastic base, and a shoulder on the boss may abut the plastic base and limit the insertion of the boss into the base.

대표청구항 ▼

[ What is claimed is:] [1.] A plastic article formed of joined pieces, comprising:a molded body molded of a plastic material and having at least one wall thereon, of a predetermined size and shape;a projecting boss of plastic material having an interconnecting portion thereon sized and shaped to eng

[ What is claimed is:] [1.] A plastic article formed of joined pieces, comprising:a molded body molded of a plastic material and having at least one wall thereon, of a predetermined size and shape;a projecting boss of plastic material having an interconnecting portion thereon sized and shaped to engage the recess-defining wall of the molded body; anda plurality of rapidly meltable projections on the interconnecting portion of the projecting boss being formed integrally with the boss, the projections being spaced circumferentially from one another to define spaces located circumferentially between adjacent projections on the interconnecting portion of the boss;the projections on the boss and the wall on the molded body having been melted and integrally mixed to fill the circumferentially located spaces between the projections to cause the projections to have lost their shape and identity so as to integrally bond the boss to the plastic body;the plastic body is formed of a first plastic material; andthe plastic boss is formed of a second different plastic material.