ES1061679U - Negative dismolling device (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Demolding device for negatives, especially in plastic molding; of the type consisting of a preferably cylindrical bushing which is fixed by means of screws to the fixed part of the mold, and of a skate which moves inside the bushing and which is fixed to the corresponding part of the mold; characterized in that the bushing has two zones internally, one cylindrical and the other shorter prismatic length, both determine an interior perimeter step; the skate is constituted of a cylindrical piece and another prismatic both related by means of a pin, presenting the prismatic, an oblong central notch crossed by a pin mounted on the bushing that guides the displacement of the prismatic piece. (Machine-translation by Google Translate, not legally binding)

Description

Negative demoulding device.

Object of the invention

The present invention relates to a device negative demoulding, especially in molding in plastic.

Background of the invention

At present several systems of  demolding of negatives in a plastic molding process.

One of these known systems consists of a steel bar of rectangular or circular section lowered to a height that allows to flex and release the negative of the mold.

The assembly and disassembly of the piece is done from the eject plate

One of the disadvantages that this implies is that if necessary, replacement due to breakage or wear of this part must be changed whole for a new one.

The time needed to mechanize the housing of the piece is considerable and implies significant costs.

Another known system is to use two steel pieces, a more or less complex in shape and folding and the another piece called cylindrical castle with cylindrical head fixed.

The folding part is mounted on a shaft.

The system does not flex and the displacement is mechanically produced through an axis.

The assembly and disassembly of the pieces is done since the expulsion of the mold.

If necessary, replacement due to breakage or wear can change the folding piece.

The adjustment of the two pieces is cylindrical with reduced conicity therefore this system has two problems:

- Plastic injection pressure can modify the position of the folding piece and produce alteration in the geometry of the pieces, burrs.

- As it has a larger cylindrical surface, it needs more travel to bring down the first piece.

To avoid these problems that present these known systems the device or system of the invention that presents a series of advantages that affect not only the demoulding but also the storage and transport

Description of the invention

The device of the invention comprises a guide sleeve in which a skate is engaged internally.

Both pieces are made of steel.

The bushing is cylindrical and has a Prismatic widening endowed with two holes for fixing of the bushing by means of screws to the part corresponding and fixed mold.

The bushing has two through holes substantially parallel axes. These drills are different diameter.

One of these through holes is located relatively close to the aforementioned widening, while the another through hole is used to position a pin.

The skate comprises two pieces of steel that remain  inside the cap. These two pieces are related by means of a pin.

One of these pieces is cylindrical and moves sliding inside the cap and emerges through the end corresponding to widening. In the extreme free zone a threaded blind hole is centered, in which a fixing screw of this end piece to the movable part of the mold.

The other part of the skate is prismatic shaft inclined longitudinal geometric.

This piece has an oblong recess centered that runs along the longitudinal geometric axis of the piece.

The section of this prismatic piece is progressively growing from its inner end to Exterior.

Inside the opening appears positioned the pin attached to the through hole already aforementioned.

The cap therefore shows inside two areas of perfectly defined shape and length, one extreme cylindrical which is where the extreme piece moves and slides cylindrical skate, and another area that is prismatic trunk whose starting with the previous one is of smaller section, delimiting a step in which the cylindrical end of the piece stops Extreme skate.

The prismatic part of the skate as it leaves the Castle is the one that acts in the opening of the mold.

The lateral step presented by the piece prismatic on one of its faces allows its movement through the inside of the cap.

It has been previously indicated that the bushing presents a through hole near the area of widening extreme. This drill is of sufficient diameter that remains faced the pin by its ends that relates the two pieces of the skate. This drill-pin positioning It allows the assembly and disassembly of the skate.

Brief description of the drawings

Figure 1 shows Figure 1 shows various side elevation views of the device or system of the invention.

Figure 2 shows a plan view of the Figure 1.

Figure 3 shows a sectional view of the line III-III of figure 2.

Figure 4 shows a sectional view of the line IV-IV of figure 2.

Figure 5 shows side elevation views of the device or system retracted.

Figure 6 shows a plan view of the figure 5.

Figure 7 shows a sectional view of the line VII-VII of figure 6.

Figure 8 shows a sectional view of the line VIII-VIII of figure 6.

Figure 9 shows a perspective view of One of the skate pieces.

Figure 10 shows a perspective view of the other training piece of the skate.

Description of a practical example of realization of the invention

The device 1 comprises a socket cylindrical 2 and a skate 3 that fits inside the cap

The bushing 2 internally has a part cylindrical 4 of longer length, and another prismatic part 5 not straight.

These two parts determine an inner step 6.

The skate 3 is defined by a cylindrical piece 7 and another prismatic part 8 of longitudinal geometric axis inclined, appearing practiced a central oblong recess 9 in that piece.

Both pieces 7 and 8 are related by means of a pin 10.

By oblong notch 9 runs in the direction transverse a pin 11 mounted on a bore of the bushing.

There is also a drill in the bushing. intern 12 that when the skate is fully inserted into the bushing is facing said drill to pin 10, being able to assemble or disassemble the two pieces of the skate when removing said pin through hole 12.

The bushing has an extreme widening 13 equipped with two holes 14 to pass and couple them cap fixing screws to the fixed part of the mold, not represented.

The cylindrical part 7 of the skate has a scraped blind hole 15 in which a screw is attached fixing to the corresponding mobile part of the mold.

The connection with pin 10 of parts 7 and 8 is  made in extreme areas of the same shaped lugs drilled 16 and 17, figures 9 and 10.

To allow the correct displacement of the skate inside the bushing, the prismatic part 8 is equipped with a lateral recess 18 that allows its free and safe displacement.

Describe sufficiently the nature of the invention, as well as how to perform it in practice, should be noted that the provisions indicated above and represented in the attached drawings are susceptible to modifications of detail as long as they do not alter the principle fundamental.

Claims (3)

1. Negative demoulding device, especially in plastic molding; of the type that consists of a preferably cylindrical bushing that is fixed by means of screws to the fixed part of the mold, and of a skate that moves inside the bushing and that is fixed to the corresponding part of the mold; characterized in that the bushing has two zones inside, one cylindrical and one of shorter prismatic length, both of which determine an inner perimeter step; The skate consists of a cylindrical and a prismatic part both related by means of a pin, presenting the prismatic, an oblong central recess crossed by a pin mounted on the bushing that guides the movement of the prismatic part. 2. Device according to claim 1 characterized in that the prismatic part of the skate has an inclined longitudinal geometric axis and also on one of its faces has a recess. 3. Device according to claim 1 characterized in that the bushing has a through hole that faces the pin that joins the two pieces of the skate when it is retracted inside the bushing.