Injection mold assembly

An injection mold assembly comprising:

• a mold set comprising a pair of outer movable mold members, a single center mold member between said outer members, and a pair of stripper plates between said center member and said outer members, respectively,
• first hydraulic actuator means connecting said center member and each outer member,
• second hydraulic actuator means connecting said center member and each stripper plate,
• each actuator means comprising hollow body means containing pressure wall means forming with said body means a first hydraulic fluid chamber which expands during opening movement and contracts during closing movement of the respective members and a second hydraulic fluid chamber which contracts during opening movement and expands during closing movement of the respective members, and
• fluid conductor means connecting all of said actuator means in a manner such that said first chamber of each actuator means communicates with said second chamber of another actuator means whereby said mold members and stripper plates undergo relative opening and closing movement in unison.

An injection mold assembly comprising:

• a mold set including a pair of outer movable mold members, a single center mold member between said outer members, and a pair of stripper plates between said center mold member and said outer members, respectively,
• hydraulic actuator means connecting said center member and each outer member,
• each actuator means comprising hollow body means containing pressure wall means forming with said body means a first hydraulic fluid chamber which expands during opening movement and contracts during closing movement of the respective members and a second hydraulic fluid chamber which contracts during opening movement and expands during closing movement of the respective members,
• fluid conductor means connecting said actuator means in a manner such that said first chamber of each actuator means communicates with said second chamber of the other actuator means, whereby said members open and close in unison, and
• linkage means connecting each stripper plate to said center member and the adjacent outer member for effecting opening and closing movement of said stripper plates in timed relation to the opening and closing movement of said mold members.