Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to cause relative movement between mold and charger
Reexamination Certificate
2000-07-12
2001-06-05
Mackey, James P. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to cause relative movement between mold and charger
C425S589000, C425S595000
Reexamination Certificate
active
06241509
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a novel and improved tiebar construction for an injection molding machine and an improved injection molding machine.
Tiebars are conventionally used in injection molding machines as shown in U.S. Pat. No. 2,739,349. See also U.S. Pat. No. 5,728,409 and U.S. patent application Ser. No. 08/582,434, filed Jan. 2, 1996, and U.S. patent application Ser. No. 08/847,895, filed Apr. 28, 1997, the disclosures of which are incorporated herein by reference. A four tiebar configuration with separate stroke cylinders is conventionally employed.
It is highly desirable to reduce the number of parts in an injection molding machine and hence the overall cost and complexity of such machines. It is also desirable to enable the more efficient use of space and provide for a simplified operation. It is also desirable to accomplish the foregoing while minimizing if not eliminating the risk of deflection which is prevalent in conventional constructions.
Accordingly, it is the principal object of the present invention to provide an improved tiebar construction for an injection molding machine, and an improved injection molding machine.
It is a still further object of the present invention to provide improved constructions as aforesaid which minimizes the number of parts and reduces cost and complexity of the overall structure.
It is a further object of the present invention to provide improvements as aforesaid which provides for a simplified operation and enables a more efficient use of space.
It is an additional objective of the present invention to provide improvements as aforesaid while minimizing if not eliminating the risk of deflection in the injection molding apparatus.
Further objects and advantages of the present invention will appear hereinbelow.
SUMMARY OF THE INVENTION
In accordance with the present invention, the foregoing objects and advantages are readily obtained.
In accordance with the present invention, a novel tiebar construction is provided for an injection molding machine, comprising: a stationary platen; a movable platen movable with respect to the stationary platen from a closed position in clamping engagement with the stationary platen to an open position spaced from the stationary platen; at least two tiebars connecting the stationary platen to the movable platen; a stroke cylinder within at least two of said tiebars operative to move the platens from an open to closed position and from a closed to open position; releasable clamping means to clamp the platens together in the closed position; and means carried by at least two tiebars to engage the clamping means. The present invention also provides a process for clamping platens together in an injection molding machine using a tiebar construction.
The present invention also includes an improved injection molding machine and process, comprising: a stationary platen; a rotatable turret means movable with respect to the stationary platen from a closed position in clamping engagement with the stationary platen to an open position spaced from the stationary platen; two tiebars connecting the stationary platen to the rotatable turret means; means to clamp the stationary platen to the rotatable turret means; and means to separate the stationary platen from the rotatable turret means.
Further features of the present invention will appear hereinbelow.
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patent: 4330257 (1982-05-01), Rees et al.
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patent: 5728409 (1998-03-01), Schad et al.
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patent: 5817345 (1998-10-01), Koch et al.
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patent: 58-81141 (1983-05-01), None
patent: 62-60618 (1983-05-01), None
patent: 5-169454 (1993-07-01), None
Galt John
Goetz Frank E.
Ing Ronald
Jacovich William James
Kestle Martin Richard
Bachman & LaPointe P.C.
Husky Injection Molding Systems Ltd.
Mackey James P.
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