Patent ID: 6827122
Filing Date: 2004-12-07
Classification: B22D

Abstract:
A mold for producing a two-stroke engine casing of a radio control model, comprising:a first core cavity defined in the mold for detachably receiving a first core corresponding in shape to a cylinder of an engine, the first core having a groove defined in an end thereof received in the mold; a core cavity defined in the mold and communicating with the first core cavity and the groove of the first core for forming a core with three blocks radially extending therefrom; a second core detachably received in the mold and extending to the core cavity to define for a bottom of the core a concave shape; a main cavity defined in the mold having a space for shaping the engine casing; a second core cavity defined in the mold and longitudinally communicating with the main cavity for allowing the first core with the core to extend into the main cavity and adapted to form the cylinder in the engine casing and the three blocks of the core each adapted to define a groove in an inner periphery of the cylinder; a third core detachably mounted in the mold and extending into the main cavity and adapted to form a space for receiving a crankshaft of the engine; a fourth core detachably mounted in the mold and extending into the main cavity, the fourth core longitudinally connected to the third core and adapted to form the space for receiving the crankshaft of the engine; a fifth core detachably mounted in the mold and extending into the main cavity, the fifth core connected to the fourth core and adapted to form an intake of the engine; a first sprue defined in the mold and communicating with the core cavity for injecting a melted material into the core cavity to form the core; and a second sprue defined in the mold and communicating with the main cavity for injecting a melted material into the main cavity to form the engine casing.