Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Flash or sprue removal type
Patent
1983-01-10
1984-04-10
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Flash or sprue removal type
249 66R, 249 85, 249 95, 264163, 26427214, 26427217, 26432811, 264334, 425110, 425121, 425127, 425554, B29C 100, B29D 300, B29D 3100
Patent
active
044420560
ABSTRACT:
A molding apparatus (10) has first and second opposed mold surfaces (22, 26) with the first mold surface (22) having a feed runner network (24). A mold structure (30) is supported by the second mold surface (26) and is spaced from the first mold surface (22). The mold structure (30) is adapted to hold a lead frame strip (38) and objects (39) held thereby in a plurality of openings (36). A gate plate (44) fits between the first mold surface (22) and the mold structure (30). The gate plate (44) has a plurality of gates or apertures (50) from a first (46) to a second (48) outfacing surface portion (46, 48) thereof. Set feed runners (71) can be removed from the molding apparatus (10) by motivating the gate plate (44) laterally across the mold structure (30). The runners are generally removed from the gate plate (44) by bending the gate plate (44) over a cylindrical surface (61) of small enough radius so that the set runners (71) cannot follow and are forced to separate gradually from the gate plate (44), eventually becoming completely free and falling away from the molding apparatus (10).
REFERENCES:
patent: 2163814 (1939-06-01), Swarovski
patent: 2382200 (1945-08-01), Brenner
patent: 2415961 (1947-02-01), Nast
patent: 2500258 (1950-03-01), Mazzoni
patent: 2650648 (1972-03-01), Lambrecht
patent: 3753634 (1973-08-01), Bliven et al.
patent: 3779506 (1973-12-01), Adams
patent: 4044984 (1977-08-01), Shimizu et al.
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