초록 ▼

A Mold assembly for forming a plastic article includes a fixed plate, a female mold, a male mold, a first sliding mechanism, a second sliding mechanism, a following block, a threaded pole, and a shaft. The male mold defines a slot. The first sliding mechanism includes a first slider received in the

A Mold assembly for forming a plastic article includes a fixed plate, a female mold, a male mold, a first sliding mechanism, a second sliding mechanism, a following block, a threaded pole, and a shaft. The male mold defines a slot. The first sliding mechanism includes a first slider received in the slot and a first inclined pin secured to the fixed plate. The second sliding mechanism includes a second slider received in the slot and a second inclined pin secured to the female mold. A molding cavity is formed in the second slider. The following block for withstanding the second slider is fixed to the female mold. The threaded pole is inserted into the molding cavity for forming an internal thread of the plastic article. An end of the shaft is connected to a driver and the other end is connected to the threaded pole to bring it rotation. While opening the mold assembly, firstly, the first inclined pin pushes the first slider sliding rearward to allow the threaded pole unscrewed. Then the second inclined pin pushes the second slider sliding rearward to make the second slider break away from the molded plastic article. Thereby it facilitates taking out the molded plastic article from the mold assembly.

대표청구항 ▼

What is claimed is: 1. A mold assembly for forming a plastic article having a complicated shape comprising: a fixed plate; a female mold placed under the fixed plate, the female mold defining a second hole therethrough; a male mold placed under the female mold, the male mold defining a slot in a to

What is claimed is: 1. A mold assembly for forming a plastic article having a complicated shape comprising: a fixed plate; a female mold placed under the fixed plate, the female mold defining a second hole therethrough; a male mold placed under the female mold, the male mold defining a slot in a top surface thereof; a first sliding mechanism comprising a first slider and a first inclined pin, wherein the first slider is slidingly received in said slot and has a sleeve extending from one side thereof and an inclined leading aperture therethrough, a first shaft hole being provided through the first slider to be in communication with the sleeve, and wherein the first inclined pin is secured to said fixed plate and passes through said second hole and the inclined leading aperture, the first inclined pin being bent at a proper location to cooperates with said inclined leading aperture to push the first slider sliding along said slot; a second sliding mechanism comprising a second slider and a second inclined pin, wherein the second slider is slidingly received in said slot and has a trapezoid hole and a second shaft hole which is coaxial with the first shaft hole, the second slider being provided with an inclined surface at on one side thereof and a mold cavity in the other side thereof, the mold cavity being in communication with the second shaft hole, and wherein the second inclined pin is secured to the female mold and passes through the trapezoid hole, the second inclined pin being bent at a proper location to cooperate with the trapezoid hole to push the second slider sliding along said slot; a following block fixed to the female mold, the following block defining a receiving groove therein which is exposed to a bottom surface of the following block so as to receive the sleeve while closing the mold assembly, the following block providing an inclined stopper corresponding to the inclined surface of the second slider, in the mold assembly closing state, the inclined stopper of the following block withstanding the second slider, while opening the mold assembly, the following block being moved upward and the inclined stopper providing a space for the second slider sliding backward; a threaded pole having an external thread at one end and a flange at the other end, a receiving hole defined in the threaded pole extending along an axis of the threaded pole; and a shaft, one end of which is a transmitting part, and the other end of which connects external driving means, the shaft passing through the first shaft hole and the sleeve, and received in the second shaft hole, the transmitting part of the shaft being received in the receiving hole so as to drive the threaded pole rotating, in the mold assembly closing state, the external thread of the threaded pole extending into the mold cavity to form a plastic article molding cavity, and the sleeve of the first slider withstanding the flange of the threaded pole, while opening the mold assembly, the first slider being moved backward to provide a space between the sleeve and the flange for the threaded pole unscrewing from the molded article. 2. A mold assembly for forming a plastic article having a complicated shape as claimed in claim 1, wherein further comprises a stripping plate placed under said fixed plate.