The mold structure for casting small-diameter and large-diameter gear discs uses a metal plate.

Abstract

The invention relates to a mold construction for casting small diameter gear discs and large diameter gear discs by means of a metal plate having the following characteristics: the metal plate (10) is a plate of predetermined thickness, width, and length covering the area for casting small diameter gear discs (20) and large diameter gear discs (30) within the same central void; the mold (40) has a first set of mold edges (41) performing the function of pressing and casting small diameter gear discs (20) having the characteristics of front gear discs; the outer edge has a first serration (21) for hooking into a chain with a small hole through the center (11) of small diameter gear discs (20) for assembly and attachment to the front gear disc shaft; the mold (40) has a second set of mold edges (42) performing the function of pressing and casting large diameter gear discs (30) having the characteristics of rear gear discs; The outer edge has a second serration (22) for hooking onto a chain with a large radial hole (12) of large diameter gear discs (30) for assembly and attachment to the rear gear disc shaft.The invention is different in that the small diameter tooth discs (20) and the large diameter tooth discs (30) are cast in a common circular area at the center of the same metal plate (10).

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