temperatures may occur between two stock moulds of a moulding tool .

The present invention concerns a device at moulding tools for preferably hot-runner injection- moulding of plastic material, silicone, aluminium, and similar materials or at moulding tools where different operating temperatures between stock moulds may occur and which comprises movable stock moulds guided by guides.

Known solutions of the type mentioned are complicated to manufacture and are accordingly costly. In particularly hot-runner injection, but also at other moulding tools comprising stock moulds where different operating temperatures may occur, it is important that the stock moulds cannot be displaced laterally with, among others, the negative result that the plastic details and other moulded details do not get a very attractive mould face on the outside, etc.

Thus, the main object of the present invention is to provide a device which, among other things, compensates the thermal expansion in the heated stock mould of a moulding tool and which solves the above- mentioned problems, easily and efficiently and cost- effective by the fact that fewer parts are required to get a satisfactory result, that the provided bushing becomes inexpensive in addition to it containing fewer parts, that it becomes simple and accordingly inexpensive to

manufacture, and that above all it is possible to

automatize the manufacture of parts included therein particularly of an included guide which in addition can be manufactured in desired length according to needs. In addition, it is desired to obtain a good and exact precision of said guide in spite of temperature variations in included tool halves.

By US 2,704,861 A, a previously known device concerns registering pins (15, 16) having a

circular circumference. This means that the registering pins may easily change location in the drillings that are intended to receive the registering pins. Neither does a device known by WO 2012/014987 Al solve the problems.

Among other things, shims (SM) are then utilized in the bottom and the side, respectively, of guide blocks (15, 25) that are utilized in recesses (14, 24) therefor in stock moulds .

Said object is achieved by means of a device according to the present invention that essentially is characterized in that the guides, which extend into the two stock moulds of the moulding tool, are formed of a peg having a square-shaped, quadratic or rectangular head, which is guided by receiving square-shaped, quadratic or rectangular milled-out reception recesses, that said guides are arranged in milled-out reception recesses in the respective corner or in another suitable location in the thermal elongation direction of the mould, of the square-shaped, quadratic or rectangular mould, that the receiving, milled-out square-shaped reception recesses of the guides are arranged commonly directed toward the centre of the moulding tool, that the guides are received in the reception recesses with slip fit, as seen in the direction of the thermal elongation direction between the square-shaped heads of the guides and the reception recesses thereof, whereby the thermal elongation of the tool is arranged to move in the direction essentially toward the centre of the moulding tool . The invention is described in the

following as a number of preferred embodiment examples, reference being made to the accompanying drawings, in which

Fig. 1 shows a schematic planar view of a half stock mould as seen from one side thereof,

Fig. 2 shows a section view through a moulding tool in mounted state showing a movable guide pin according to a first embodiment example,

Fig. 3 shows a section view through a moulding tool in mounted state showing a movable guide pin according to a second embodiment example,

Fig. 4 shows a section view along the line IV-IV in Fig. 2, and

Fig. 5 shows in a partly section view a registering pin according to the invention.

A device 1 at moulding tools 2, which is intended for hot-runner in ection-moulding of plastic material, silicone, aluminium, and similar materials or at moulding tools where different operating temperatures between stock moulds may occur, and which comprises movable stock moulds 3, 4 guided by guides 5. According to the present invention, said guides 5 are arranged in milled-out quadrangular, quadratic or rectangular recesses 7 in the respective corner 6 or in another suitable location in the thermal elongation direction of the mould of said mould or in another suitable location in the thermal elongation direction (8) of the mould.

Furthermore, the receiving, milled-out square-shaped, quadratic or rectangular reception recesses 7 of said guides are arranged directed in a common direction 8, essentially toward the centre 9 of the moulding tool, toward which the thermal elongation of the tool, which, among other things, is caused by injection with hot plastic, etc., is arranged to move.

Said guides 5, which extend into the two stock moulds 3, 4, of the moulding tool, are formed of a peg having a square- shaped, quadratic or rectangular head 26, which is guided by square-shaped, quadratic or rectangular mating reception recesses 7.

A screw 10 provided with threads 11, at least at the front end portion thereof, is possible to screw in, and said guide-forming peg, respectively, in a threaded hole 20 and is received by a holder-on 12, which is retained by one of the stock moulds 3, jammed by a fastening plate 13 by means of a projecting flange 14 of the holder-on 12. This is clearly shown in Fig. 2.

In Fig. 3, a said screw 10 is shown, which is insertable from the outer end 5A of the guide 5 formed as circular peg into a centre hole 30 in the direction from the opposite direction of the screw shown in Fig. 2 in the guide 5, as seen in the length extension 25 of the guide. The holder-on 12 shown in Fig. 3 has an internally threaded hole 15 having threads 16 that the threads 11 of the screw 10 are tightened in. This holder-on 12 abuts with the flange 14 thereof in a recess 18 in one of the stock moulds 3. In the embodiment shown in Fig. 3, the holder-on 12 is retained against rotation by a plug 19, which is received in a mating transverse hole 21 in the first stock mould 3 in the area of the flange 14 and the recess 18.

According to both embodiment examples, said guide- forming peg is receivably guided in a bushing 22 and receivably guided in the second stock mould 4 in the through hole 23 thereof. A gauge block 24, selectable to desired length in the axial direction 25, may be receivable between said holder-on 12 and the guide-forming peg 5 against the quadrangular head 26 thereof, which is

received in a mating recess 7 in the stock mould 3, as is shown in Fig. 3 wherein the desired distance A thereby easily can be obtained.

The guide-forming peg, which accordingly has a square-shaped, quadratic or rectangular head 26, has a circular cross-sectional shape of the guiding front part 27 thereof projecting perpendicularly from the head 26.

Thus, the guide- forming peg 5 has a threaded hole 28 while the holder-on 12 has a through hole 15 as shown in Fig. 2, or that, as shown in Fig. 3, the guide- forming peg 5 has a through centre hole 30 while the holder-on 12 has a threaded hole 15, all accordingly mating to the diameter and threaded portion, respectively, of said screw 10.

Said guides 5 are received in the

appurtenant reception recesses 7 with slip fit, as seen in the direction of the thermal elongation direction 8 between the square-shaped heads 26 of the guides 5 and the reception recesses 7 thereof.

Said reception recesses 7 are formed of the milled-out portions, which extend out through the end portions of the appurtenant stock mould in the corners of the stock mould 3 or in another suitable location in the thermal elongation direction (8) of the mould.

In said reception openings, a play X is arranged between the parallel end surfaces I, II of the quadratically or rectangularly shaped head of the peg and the flat, parallel opening end surfaces 100, 200 situated at a distance from each other and which are perpendicular to said thermal elongation direction 8. See Fig. 4 wherein the end surfaces III, IV and 300, 400, respectively, situated parallel to each other and to the thermal

elongation direction 8, act with slip fit and these surfaces have a good tolerance and good surface

smoothness .

A bushing 32 of standard type is

receivable in the tool 2 at an additional fastening plate 33, which is situated on the opposite side of the stock moulds 3, 4.

The function of the device 1 and the rest of the invention should have been clear from the above- mentioned where the nature of the included parts is thoroughly described and explained. In the drawings, the tool 1 is shown in assembled state.

In the embodiment shown in Fig . 2 , the screw 10 can be secured for stable retention in the guide 5 by means of adhesion agent of a suitable kind, e.g.

Loctite™. The length L of said guide 5 may also be selected to fit to the tool 2 and the size thereof according to needs. The same is the possibility of selecting a suitable length A of a gauge block 24 that is threaded onto the screw at the front end thereof between the holder-on 12 and the guide and the head portion 26 thereof.

Furthermore, the formed movable pin is arranged dismountable , for, for instance, face grinding of the stock moulds 3, 4, whereby the same upon mounting is arranged to be set to zero by means of a feeler gauge or the like means, so that the position of said pin exactly corresponds to the bushings of the lower stock mould.

The function and nature of the invention should have been clearly understood from the above- mentioned and also with knowledge of what is shown in the drawings but the invention is naturally not limited to the embodiments described above and shown in the accompanying drawings. Modifications are feasible, particularly as for the nature of the different parts, or by using an

equivalent technique, without departing from the

protection area of the invention, such as it is defined in the claims.