Machine for producing parts of foamed plastic material

Details Machine for producing parts of foamed plastic material Machine for producing parts of foamed plastic material

1999-06-09

2001-05-08

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

C425S338000, C425S450100, C425S451900, C425S81700C

Reexamination Certificate

active

06227835

ABSTRACT:

The present invention relates to a machine for producing parts of foamed plastic material.
More specifically, the present invention relates to a machine for producing parts of foamed plastic, polyethylene, polypropylene and copolymer material.
BACKGROUND OF THE INVENTION
Machines of this sort are known to feature a supporting frame to which is fitted in a fixed position an injection station for receiving a first half-mold which is locked on to the injection station. The frame also supports a movable frame for supporting a second half-mold, and which is connected to the ends of a number of push rods for keeping the second half-mold perfectly parallel to the first half-mold, and for imparting to the second half-mold a relatively precise approach movement to couple and keep the two half-molds coupled along the whole of their respective peripheries at the injection station.
Known machines of the above type have several drawbacks, mainly due to the presence of the push rods, which prevent free access to the mold, thus complicating maintenance and replacements; transmit externally, i.e. on to the frame, both the forces applied to the half-molds and the forces generated inside the mold, so that relatively strong, high-cost frames must be used; and call for an extremely high degree of assembly and operating precision.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a machine for producing parts of foamed plastic material, designed to eliminate the aforementioned drawbacks.
According to the present invention, there is provided a machine for producing parts of foamed plastic material, the machine comprising a gantry-type frame; a first half-mold and powered carriage means supported by said frame; a second half-mold suspended from said carriage means and movable with the carriage means along said frame to impart to the second half-mold an approach movement towards, and a parting movement from, the first half-mold; and a number of electromagnets interposed between the two half-molds to lock the second half-mold to the first half-mold in a closed position forming an injection mold for the plastic material.


REFERENCES:
patent: 3590418 (1971-07-01), Hoeschel
patent: 3844524 (1974-10-01), Fisher et al.
patent: 3887312 (1975-06-01), Seary
patent: 4648825 (1987-03-01), Heil et al.
patent: 0 544 903 (1993-06-01), None
patent: 0 832 728 (1998-04-01), None
patent: 2 104 439 (1983-03-01), None

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