Patent ID: 7217115
Filing Date: 2007-05-15
Classification: B29C

Abstract:
1. A high speed direct mold clamping apparatus of an injection molding machine comprising: a clamping cylinder of a uniform inside diameter, the clamping cylinder including an oil channel portion having a plurality of grooved oil channels formed therein and a close contact portion formed of a curved surface leaded to the oil channel portion; a clamping ram slidably coupled with the clamping cylinder, and having a first channel for allowing for the flow of oil and a booster cylinder connected to the first channel; a booster ram slidably coupled with the booster cylinder of the clamping ram and having a second channel leaded to the booster cylinder; a moving platen coupled with one end of the clamping ram; a fastening element for coupling the one end of the clamping ram with the moving platen by adjusting the length therebetween; a stationary platen installed to be opposed to the moving platen; a first port formed in the oil channel portion for the selective flow of oil; a second port formed in the close contact portion for the selective flow of oil; and means for controlling the flow of oil through the first and the second channels and the first and the second ports; wherein the plurality of grooved oil channels are arranged radially in the oil channel portion, wherein the clamping ram has a plurality of coupling projections at one end, and wherein the fastening element includes a pair of half nuts arranged in the moving platen, capable of coupling with and separating from each other, and each having a plurality of coupling grooves therein corresponding to the coupling projections.