Importance

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Abstract

A grille unit has a frame and a vane pivotally connected to the frame via opposing first and second shafts. The frame has first and second holes snugly receiving the first and second shafts respectively. The first shaft has a peripheral surface, the diameter of which continuously varies along the axis thereof. The second shaft has a similar peripheral surface. The varying-diameter surfaces of the first and second shafts face in opposite directions. The frame has a first inner surface which conforms to the varying-diameter surface of the first shaft to engage the latter. The frame has a second inner surface which conforms to the varying-diameter surface of the second shaft to engage the latter. A method of manufacturing the grille unit includes the steps of forming the frame from plastic, and assemblying a mold with the frame positioned within the mold. In this case, the mold has therein a space snugly accommodating the frame, a cavity conforming to the vane for making the vane, first and second passages connecting the first and second holes of the frame with the cavity respectively, and a gate extending from the outside of the mold to the cavity. After assembly of the mold, soft plastic is injected into the cavity via the gate until the injected soft plastic fills the first and second holes of the frame via the first and second passages.

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First Claim