| 摘要 |
A toggle joint of an injection molding machine includes several spaced stationary arm members, a movable arm member, a pivotal rod, and bushings fitted in the movable arm member; the pivotal rod has oil passages therein, and it is connected to the stationary arm members and passed through the bushings such that the movable arm member pivots on the pivotal rod; each of the bushings has oil passages on an inner side, and two annular grooves on the inner side, which are on two sides of the oil passages; leak-prevention rings are respectively fitted on the annular grooves of the bushings for preventing leakage of lubricating oil when the oil is supplied between the bushings and the pivotal rod from the pivotal rod.
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