Patent ID: 7780435

Claim:
An apparatus for injection molding, the apparatus comprising: an injection unit comprising a nozzle, the nozzle having a first flat end surface and a passage defined therein extending toward and terminating at the first flat end surface; and a mold unit comprising a sprue bushing for communicating with the nozzle, the sprue bushing having a second flat end surface for contacting the first flat end surface of the nozzle, and a sprue defined therein extending toward and terminating at the second flat end surface, wherein a protrusion is formed on one of the first flat end surface of the nozzle and the second flat end surface of the sprue bushing, and a corresponding recess is defined in the other of the first flat end surface of the nozzle and the second flat end surface of the sprue bushing, the protrusion and the recess are spaced apart from the passage and the sprue by a part of the first flat end surface or a part of the second flat end surface, the protrusion is for engaging in the recess.