Injection moulding die locking and opening device

Details Injection moulding die locking and opening device Injection moulding die locking and opening device

1999-05-28

2001-04-24

Pyon, Harold (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Shaping surface including means to release or remove product...

By movable mold sections

C425S451700, C425S594000, C425S595000

Reexamination Certificate

active

06220848

ABSTRACT:

BACKGROUND
1.0 Field of the Invention
This invention relates to a mechanism for locking and opening an injection mold, more particulary for processing low-viscosity molten plastic.
2.0 Discussion of Related Art
Injection molds are available in various forms. For example, it is known, even in the processing of low-viscosity molten plastic, that the upper half of a mold, for example, can be moved downwards by a closing cylinder onto the lower half, and then held under pressure in the closed position, with pressures of 6,000 to 7,500 N being applied. It is also possible to assemble a casting mold by hand via a drawer system and then insert it into clamps which lock the mold halves and fix them in relation to an injection nozzle.
It is also known that mold halves can be guided on slide elements for opening and closing, and kept in the closed position by toggle levers. If closing cylinders, toggle levers or the like are used, comparatively high outlay for equipment is involved. In addition, space has to be created for the closing mechanism, for example above a worktable, if the upper mold half is moved by a cylinder into the working position on the lower half and held in that position.
3.0 SUMMARY OF THE INVENTION
An object of the present invention is to provide a technically simple inexpensive mold locking mechanism for substantially eliminating the need for elements above the worktable level or in front of a vertically arranged mold plane.
The above object and other objects are provided in accordance with the invention by clamping pins which hold one part of the mold in the closed position relative to the other part and which are each designed for axial displacement by an associated slide element into either a closed position, or into an open position.
The locking of the mold halves relative to one another by the combination of clamping pins and slide elements actuating the clamping pins the other hand provides for a very simple construction.
The combination of clamping pins and slide elements fixing the clamping pins makes the closure independent of the injection pressures applied. The locking mechanism according to the invention is capable of withstanding very high pressures.
In one embodiment of the invention, the two slide elements are combined to form a forked slide which is mounted for displacement by a drive element, more particularly a pneumatic cylinder. Pneumatic cylinders with a comparatively low closing pressure may be used in accordance with the invention because the pneumatic cylinders are not required to apply a closing pressure. This is done via a cable element or directly through the slide elements.
In a preferred embodiment of the invention, one part of the mold is designed as a lower mold half positioned at worktable level while the other part of the mold is designed as an upper mold half, the forked slide and its drive being arranged below worktable level.
This arrangement enables the working plane to be kept substantially free from mold closing or actuating elements so that considerable freedom of movement is available as there is no need for conventional positive locking mechanisms.
In another embodiment of the invention, the slide elements are formed with longitudinal slots which merge into a widened region that allows a head element on each clamping pin to pass through.
Another particularly advantageous embodiment is characterized in that, on one side, each slide element has a ramp which moves the clamping pin into the closed position and, on the other side, a ramp which moves the clamping pin into the open position.
This construction according to the invention provides not only for optimal closing of the mold halves, but also for simple opening because the mold automatically undergoes a minimal lifting movement via the ramp for movement into the opening position which considerably simplifies removal of the molding.


REFERENCES:
patent: 2115590 (1938-04-01), Ryder
patent: 2370622 (1945-03-01), Gastrow
patent: 3132378 (1964-05-01), Johannigman
patent: 3259942 (1966-07-01), Politis
patent: 3353221 (1967-11-01), Barnett et al.
patent: 3743469 (1973-07-01), Gibbons
patent: 4184835 (1980-01-01), Talbot
patent: 4265610 (1981-05-01), Dorsey
patent: 4535689 (1985-08-01), Putkowski
patent: 4747982 (1988-05-01), Nakatsukasa et al.
patent: 4768946 (1988-09-01), Maruyama et al.
patent: 4842506 (1989-06-01), Coutier
patent: 4867672 (1989-09-01), Sorenson
patent: 5112207 (1992-05-01), Pinsonneault
patent: 5456588 (1995-10-01), Yonekubo et al.
patent: 5460763 (1995-10-01), Asai
patent: 5580587 (1996-12-01), Leonhartsberger et al.
patent: 6030569 (2000-02-01), Yu
patent: 0 286 553 (1988-10-01), None
patent: 0 488 261 (1992-06-01), None
patent: 63-42828 (1988-02-01), None
patent: 63-174773 (1988-07-01), None
Research Disclosure, No. 250, (1985) XP002059366.
Patent Abstracts of Japan, vol. 12, No. 442 (1988).
Patent Abstracts of Japan, vol. 12, No. 260 (1988).

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