Mold for manufacturing toothed articles such as combs

Claim 1

A mold for injection-molding a comb comprising a first mold part and a second mold part forming a joint plane between them and separable in a direction perpendicular to said plane, said first mold part being a monoblock forward with a single row of individual parallel cavities closely spaced in the manner of comb teeth and of a configuration complementary thereto extending perpendicular to said plane and tapering away therefrom, said mold parts jointly being formed with a further cavity extending along and communicating with said parallel cavities for forming a comb back, and means for extracting a comb molded in said cavities in a direction perpendicular to the mold-separation direction, said cavities being defined only by said first and second mold parts, said monoblock first mold part being further formed with a channel connected to said parallel cavities at the ends thereof remote from said plane and permeable to air but not to plastic materials, said channel being a slit of a width of about 0.02 mm extending across all of said parallel cavities and in communication therewith, said parallel cavities each tapering laterally outwardly from a longitudinal median plane, said further cavity being formed with a pair of chambers extending parallel to said joint plane at opposite ends of said means including a pair of ejector pins parallel to said parallel cavities and perpendicular to said joint plane for respective engagement with said projections.