Patent ID: 8622732

Claim:
A multi-rod mechanism for opening and closing molds, comprising: a cam rotating to generate a driving power; a cam follower actuated by the cam to linearly move back and forth; a first side connection rod assembly actuated by the cam follower to swing; a first mold actuated by the first side connection rod assembly to linearly move back and forth; a linkage connection rod actuated by the first side connection rod assembly to swing; a second side connection rod assembly actuated by the linkage connection rod to swing, wherein the cam and the cam follower are disposed between the first side connection rod assembly and the second side connection rod assembly; and a second mold actuated by the second side connection rod assembly to linearly move back and forth; wherein the second mold cooperates with the corresponding first mold which linearly moves back and forth opposite to the second mold, so that the second mold is close to or away from the first mold for carrying out a mold closing operation or a mold opening operation; wherein the first side connection rod assembly comprises a quadruple joint connection rod, a first push connection rod, a first support connection rod and a first mold connection rod; and wherein the quadruple joint connection rod is actuated by the cam follower to pivotally rotate, so that the first push connection rod then pushes or pulls the first support connection rod and the first mold connection rod; wherein the quadruple joint connection rod has a pivotal fulcrum, a following pivotal point, a linkage pivotal point and a push pivotal point; and wherein the pivotal fulcrum is pivotally connected to a first pivotal base, the following pivotal point is pivotally connected to the cam follower, the linkage pivotal point is pivotally connected to the linkage connection rod, and the push pivotal point is pivotally connected to the first push connection rod; and wherein the cam follower has a following connection rod to be pivotally connected to the following pivotal point of the quadruple joint connection rod; the first push connection rod and the push pivotal point, the pivotal fulcrum and the linkage pivotal point of the quadruple joint connection rod are arranged along a common first vertical line in the mold opening operation or the mold closing operation; and a horizontal extension line defined by the cam follower and the following connection rod is vertical to the first vertical line.