Injection moulding machine

Details Injection moulding machine Injection moulding machine

1998-08-06

2001-02-13

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 lock mold in closed position

C100S231000, C100S25800A, C425S451900

Reexamination Certificate

active

06186771

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an injection moulding machine as described in the preamble to claim
1
. The invention relates in particular to injection moulding machines with very high closing pressures.
Description of the Prior Art
Injection moulding machines of this kind are known from the applicant's own earlier International Patent Application no. PCT/DK95/00339. With the configuration disclosed herein, it is possible to maintain a large, open, freely accessible area between the planes in the same manner as is known from machines without tie rods, and still maintain full parallelism between the planes at very high closing pressures, which is very difficult with machines without tie rods. This is achieved without using complicated mechanisms and thus without increasing the costs of the machine to any significant degree. The possibility of adjustment which enables the planes to remain parallel, even at high closing pressures, is achieved by means of tie rods or the like between a mounting plane and the stationary plane, and with at least one swivel joint in the plane's opposite side in relation to that to which the tie rods are secured. These auxiliary tie rods are disposed in such a manner that they do not hinder access to the area between the planes. The pivot links are, for example, rounded projections or the like which rest against a rounded surface.
A similar construction is known from German Utility Model Publication No. 9421299, but wherein bearings are used where the planes and the tie bars are coupled together. This has several disadvantages, among these being that the bearings get worn by the high pressures and, moreover, have to be adjusted and lubricated, which is very difficult because of the effects of the great pressure.
SUMMARY OF THE INVENTION
A desired function and parallelism is achieved between the halves of the mould completely without any mechanically moving parts, in that the possible turning of the planes is achieved by the resilience of the elastic machine part.
In the present description, an elastic machine part is to be understood to be a joint-like element without mutually moving parts, i.e. the movement arises solely as a consequence of the machine part's own resilience or possible elastic deformation.
The machine part according to the invention can withstand even very high pressures without any deformation in the direction of pressure.
The machine part itself can be configured either as an independent unit or as an integrated unit, where the part is integrated with one of the parts which serve to effect the actual coupling together. Both configurations offer advantages of a practical nature as well as from the point of view of production technique, depending among other things on the construction etc. of the rest of the injection moulding machine.
The injection moulding machine according to the invention achieves a uniform construction at both sides of the machine, which among other things makes the preceding calculation and construction work more simple.
An elastic machine has a desired resilience or elasticity and at the same time the possibility is provided of being able to provide securing elements, e.g. threaded holes, in the areas which are not deformed.
The part is hereby configured as an independent unit which has a practical shape and is simple to produce. It is possible for its configuration to be symmetrical, so that it does not need to be turned in a certain way when being mounted.
The invention also relates to a specially-configured injection moulding machine with optimized characteristics, having a so-called C-frame self-supporting machine frame as disclosed in claim
9
. With the combination of such an injection moulding machine frame configured with tie bars at the bottom of the planes as described above, and an elastic machine part similarly as described above, as far as the parts which must maintain the parallelism between the two halves of the moulding tool are concerned, the resulting injection moulding machine is one without mechanical parts which move in relation to one another during the moulding process. In such a machine according to the invention, the relevant parts, i.e. the C-frame, the tie bars between the planes and the elastic machine part(s), will all be elastic and will yield slightly due to the injection pressure. The individual parts can be dimensioned in such a manner that the elastic expansions, the outward bending etc., completely compensate for each other, and the two halves of the mould remain parallel, even at very high injection pressures. Since the parts do not move mechanically but only elastically in relation to each other, there are no bearings or the like which need to be lubricated or maintained in any way, which is a very great advantage.


REFERENCES:
patent: 2266129 (1941-12-01), Tagarty
patent: 5354196 (1994-10-01), Ziv-Av
patent: 5538415 (1996-07-01), Reinhart et al.
patent: 5556656 (1996-09-01), Lampl et al.
patent: 5633024 (1997-05-01), Ziv-Av
patent: 5650182 (1997-07-01), Füller et al.
patent: 5783231 (1998-07-01), Fuller et al.
patent: 5811141 (1998-09-01), Pickel et al.
patent: 5888560 (1999-03-01), Naderhirn
patent: 5891488 (1999-04-01), Witsttock et al.
patent: 9421299 (1995-08-01), None
patent: 4420639 (1995-09-01), None
patent: 9707961 (1997-03-01), None

Affiliated with

Also associated with

Rating

Injection moulding machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Injection moulding machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injection moulding machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2567102