Mold clamp

Details Mold clamp Mold clamp

1999-02-19

2001-07-24

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Segmented female mold and mold clamping means

C292S256000, C292S257000, C425S595000, C425SDIG005

Reexamination Certificate

active

06264458

ABSTRACT:

FIELD OF INVENTION
This invention relates to a clamp for a mold for effectively increasing the tonnage of a press. In particular, this invention relates to a simple yet effective device for retaining mold halves together during an injection process.
BACKGROUND OF INVENTION
Mold clamps are well known in the art. Typically, mold clamps have focused on clamping onto the drive cylinders of a press. The clamps will lock the drive cylinders in place to increase the effective tonnage of the press. However, these devices do not adequately address the problem of localized flashing.
SUMMARY OF THE INVENTION
The disadvantages of the prior art may be overcome by providing a mold clamp which can be mounted onto opposite halves of a mold which, in a locked condition, drivingly hold the mold halves together and, in an unlocked condition, swing out so as to not interfere with the opening and closing of the mold halves.
According to one aspect of the invention, there is provided a mold clamp having a drive pivotally mounted on a first mold half. The drive includes a cylinder body and a piston, wherein one of the cylinder body or the piston is pivotally mounted to the first mold half and the other has a pair of pins and a locking plate having an engagement face. A guide directs the drive between a retracted position and an extended position. The guide has a pair of spaced apart guide plates mounted to the first mold half. Each guide plate has an arcuate slot slidably receiving the pins. An abutment is mounted on a second mold half. The abutment has a complementary engagement face for cooperating with the engagement face of the drive for enhancing engagement therebetween. When the drive is in the retracted position, the drive engages the abutment to apply a closing force between the first mold half and second mold half; when the drive is in the extended position, the drive is canted away from the first mold half allowing reciprocating relative motion between the first mold half and the second mold half.


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