Importance

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Abstract

The monolith includes a base of plastic resin material having elongated bristles of the same resin material monolithically relatively upstanding on one side thereof so that the monolith can be used as a brush. The base of the monolith is molded in a cavity having branches thereof in which the bristles are formed. The bristles are formed to have shank portions relatively upstanding from the one side of the base to points on the longitudinal axes of the bristles relatively intermediate between the one side of the base and the tips of the bristles, and tip portions extending relatively outwardly along the axes of the bristles from the intermediate points to the tips of the bristles. And in forming the respective bristles, plastic resin material which was injected into the cavity and the branches in turn, is encountered by a plate across the distal ends of the branches, at which the gas displaced into the branches from the cavity discharges to atmosphere, relatively laterally of the branches, while dimples in the plate operate to round off the tips of the bristles formed therein. Meanwhile, the circumferential walls of the branches taper toward the distal ends thereof from planes coinciding with the intermediate points of the bristles, so that the bristles relatively slideably disengage from the branches when the mold is opened and the monolith is relatively retracted from that member of the mold defining the branches.

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First Claim