초록 ▼

An apparatus for molding articles, particularly those having a body portion formed from a cured material and bonded to a relatively rigid insert portion. Two mold members are arranged for relative movement along a given axis between open and closed positions. Each of the members includes surfaces at

An apparatus for molding articles, particularly those having a body portion formed from a cured material and bonded to a relatively rigid insert portion. Two mold members are arranged for relative movement along a given axis between open and closed positions. Each of the members includes surfaces at least partly directed towards each other to define in said closed position of the members, a molding cavity between the members. One of the mold members has a part for engaging a relatively rigid insert, so as to form a flash barrier on the insert when it is engaged by the mold part. The mold has surfaces for supporting the insert on at least one of its surfaces. The mold assembly includes a third mold member which is movable relative to both of the other two mold members. The moldable material from which the article is to be formed is received on one mold member, and the other member is reciprocable along a given axis and adapted to apply a predetermined closing force to the first and third members. Springs or other resilient means are disposed between a mold plate and the first mold member, and a second spring is disposed between the third mold member and the mold plate, and the first and third mold members have sealing surfaces engaging each other and separated only by a working clearance. In use, the members respectively first engage the stamping, then the rubber, and finally, under the spring force, move the rubber into the mold and hold it there under a predetermined force.

대표청구항 ▼

An apparatus for molding articles having a body portion formed from a cured material and bonded to a relatively rigid insert portion, said apparatus comprising, in combination, first and second mold members arranged for relative movement along a given axis between open and closed positions of said m

An apparatus for molding articles having a body portion formed from a cured material and bonded to a relatively rigid insert portion, said apparatus comprising, in combination, first and second mold members arranged for relative movement along a given axis between open and closed positions of said members, each of said members including surfaces at least partly directed towards each other to define therebetween, in said closed position of said members, a molding cavity predetermining the exact shape of the body of said article to be formed, means on said first member for engaging a relatively rigid insert, said engaging means being adapted to form a flash barrier on said insert upon engagement thereof, means on said second member for supporting said insert along at least one surface thereof, a material pressing member movable relative to both said first and second mold members, means on said second mold member for receiving a prepared portion of moldable material from which said article is to be formed, means reciprocable along said given axis for applying a predetermined closing force to said first mold member and said press member, first resilient means disposed between said force applying means and said first mold member, second resilient means disposed between said press member and said force applying means, said first, second mold members and said press member confining said portion of moldable material, said members having mutual sealing surfaces separated from each other by a working clearance, said first and second resilient means having uncompressed, free height positions such that movement of said force applying means causes said first mold member to move from said open position to said closed position, thereby to define said molding cavity between said first and second mold member and said insert, and whereby subsequent movement of said press member causes said press member to engage said material and causes only that material able to be accommodated by said cavity to flow from the area of said material-receiving means into said molding cavity under the force applied by said press member through said second resilient means, the shape of said body portion thereby being determined solely by the predetermined shape of said cavity and not by the amount of moldable material in said portion thereof, the resiliency of said second resilient means limiting the force able to be applied to said material.