DEVICE FOR DEMOLDING PARTS AND MOLD INCLUDING THE DEVICE

Abstract

A device for demolding parts includes a slider for housing a figure insert for the molding of a negative of the part to be molded. The slider is associated with a push rod, which can move the slider to an ejection position of a part to be molded. The device also includes a gas cylinder for driving the displacement of the push rod. The device eliminates an inclined guide and a safety wedge, saving a great deal of work and focusing all the machining only on a punch plate.

Claims

1. A device for demolding parts in a mold, comprising: a slider for housing a figure insert for molding a negative of the part to be molded, said slider being associated with a push rod, which can move said slider to an ejection position of a part to be molded, and a gas cylinder for driving the displacement of said push rod.

2. The device for demolding parts in a mold according to claim 1, wherein the piston rod of the gas cylinder can only be placed in an extended position or in a retracted position.

3. The device for demolding parts in a mold according to claim 1, wherein said push rod comprises at its upper end a rack, which engages with another rack of said slider, the movement of said push bar being transferred to said slider through said racks.

4. The device for demolding parts in a mold according to claim 1, comprising a base on which said slider slides.

5. The device for demolding parts in a mold according to claim 1, wherein said slider is positioned perpendicular to said push rod.

6. The device for demolding parts in a mold according to claim 2, wherein said rack of the slider is positioned with its teeth inclined to the longitudinal axis of the slider.

7. The device for demolding parts in a mold according to claim 3, wherein the teeth of said rack of the push rod are positioned inclined with respect to the longitudinal axis of the push rod.

8. The device for demolding parts in a mold according to claim 1, wherein said push rod comprises a adjustment disk at the end furthest away from the gas cylinder.

9. The device for demolding parts in a mold according to claim 1, comprising a cooling source of said insert.

10. The device for demolding parts in a mold according to claim 9, wherein said cooling source comprises a tube for the passage of cooling water to said insert.

11. A mold comprising the device for demolding parts according to claim 1, wherein said device is arranged entirely on a plate of the mold.

12. The mold according to claim 11, wherein said plate on which the device for demolding parts is placed is the punch plate of the mold.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] For a better understanding of the foregoing, a set of drawings have been attached which, schematically and as a non-limitative example, represent a practical embodiment of the invention.

[0034] FIG. 1 is an exploded perspective view of the device for demolding parts according to the practical embodiment of the invention;

[0035] FIG. 2 is a schematic elevational view of the device for demolding parts of the practical embodiment of the invention; and

[0036] FIGS. 3a to 3c are schematic elevational views of a mold provided with the device for demolding parts of the practical embodiment of the invention in its injection position with the mold closed, in the open position of the mold and in the ejection position, respectively.

DESCRIPTION OF A PREFERRED EMBODIMENT

[0037] Said device for demolding parts of the present embodiment is arranged in its entirety on a plate 20 of the mold, and in particular in the so-called punch plate, as can be seen in particular in FIGS. 3a to 3c, and comprises in its upper part a base 4 on which a slider 11 slides. Said base 4 is attached to the mold by means of fixing screws 6.

[0038] Said device also comprises a figure insert 12 (shown in FIG. 2) removably attached to said slider 11, the insert 12 of which molds a negative 13 or protrusion in the desired shape. Evidently, said insert 12 can be removed and a different insert be inserted to carry out the molding of a part with a different inner protrusion. Said insert 12 is the element in which the shape of the negative to be reproduced in the plastic part is machined.

[0039] The device of the present embodiment also comprises a push rod 7 located substantially vertically in the mold. Said push rod 7 moves said insert 12 between a closed position (shown in FIG. 3a), an open position (shown in FIG. 3b) and an ejection position (shown in FIG. 3c) of the mold.

[0040] The movement of the push rod 7 is actuated by a gas cylinder 1, which piston rod can be positioned only in an extended position or in a retracted position.

[0041] When the piston rod of the gas cylinder 1 is in the retracted position, the slider 11 is in the molding position of the plastic part 13 (FIGS. 2 and 3a), while when the gas cylinder 1 is in the extended position, the slider 11 is in the release position of the plastic part (FIG. 3b). When the gas cylinder 1 goes from its retracted position to its extended position, the slider retracts or slides to the left, according to the arrangement shown in FIG. 2.

[0042] The distal end of the piston rod preferably enters into contact with the push rod 7 by means of a stop 2, secured to one of the ends of the push rod 7.

[0043] At the other end, said push rod 7 preferably comprises a adjustment disk 8, for easily and accurately adjusting the length of the push rod 7.

[0044] Said push rod 7 comprises at its upper end a rack 21, which engages with another rack 22 of said slider 11, the movement of said push rod 7 being transferred to said slider 11 through said racks 21, 22.

[0045] As it can be seen in the figures, the rack 22 of the slider 11 is positioned with its teeth inclined towards the longitudinal axis of the slider 11, and the teeth of the drive rack 21 of the push rod 7 are also inclined with respect to the longitudinal axis of the push rod 7.

[0046] It should be noted that the inclination of these teeth is variable, such that it is possible to vary the inclination of the slider 11 with respect to the push rod 7 in a very simple manner, thereby increasing or decreasing the demolding path.

[0047] If desired, the demolding device according to the present embodiment may also comprise cooling, and in particular a cooling source 5 provided with a tube 3 for the passage of cooling water, thereby cooling the insert 12 and/or the gas cylinder 1 and, consequently, the negative 13. This cooling source 5 is rotatable, which allows the positioning of said cooling source 5.

[0048] Although reference has been made to a particular embodiment of the invention, it will be evident to a person skilled in the art that the demolding device and the mold described herein are susceptible to numerous variations and modifications, and that all of the above details can be replaced by other technically equivalent details without departing from the scope of protection defined by the attached claims.