SAFETY DEVICE FOR INJECTION MOLDS

Abstract

The safety device for injection molds comprises: a plate (1) attachable to a fixed part of a mold; a base (4) attachable to a movable part of a mold; wherein the base (4) comprises a safety shaft (10) movable between an unmounted position, wherein said safety shaft (10) is housed in a bore (13) of the plate (1), preventing displacement between the plate (1) and the base (4), and an assembled position, in which said safety shaft (10) is located outside the hole (13) of the plate (1), the displacement of the safety shaft (10) being driven by an actuator (7), allowing displacement between the plate (1) and the base (4). It ensures the connection of the two parts of the mold when the mold is not mounted on the injection molding machine.

Claims

1. Safety device for injection molds, characterized in that it comprises: a plate (1) that can be attached to a fixed part of a mold; a base (4) that can be attached to a movable part of a mold; wherein the base (4) comprises a safety shaft (10) movable between: a dismounted position, wherein said safety shaft (10) is housed in a hole (13) of the plate (1), preventing displacement between the plate (1) and the base (4), and an assembled position, wherein said safety shaft (10) is located outside the hole (13) of the plate (1), the displacement of the safety shaft (10) being driven by an actuator (7), allowing the displacement between the plate (1) and the base (4).

2. Safety device for injection molds according to claim 1, wherein in said actuator (7) is arranged at one end of a drive shaft (9) provided with a spring (6), which pushes the drive shaft (9) to move the safety shaft (10) to the dismounted position.

3. Safety device for injection molds according to claim 2, wherein said drive shaft (9) comprises a rod (8).

4. Safety device for injection molds according to claim 2, wherein the drive shaft (9) comprises teeth engaging with complementary teeth of the safety shaft (10).

5. Safety device for injection molds according to claim 1, wherein the plate (1) comprises a centering sleeve (3).

6. Safety device for injection molds according to claim 2, wherein the plate (1) comprises a centering sleeve (3).

7. Safety device for injection molds according to claim 3, wherein the plate (1) comprises a centering sleeve (3).

8. Safety device for injection molds according to claim 4, wherein the plate (1) comprises a centering sleeve (3).

Description

DESCRIPTION OF THE DRAWINGS

[0027] In order to complement the description being made and in order to assist in a better understanding of the features of the invention, in accordance with a preferred example of a practical embodiment thereof, a set of drawings is attached hereto as an integral part of the said description, in which the following is illustratively and non-limitingly depicted:

[0028] FIG. 1 is a top perspective view of the safety device for injection molds according to the present invention;

[0029] FIG. 2 is a bottom perspective view of the safety device for injection molds according to the present invention;

[0030] FIG. 3 is a perspective section view of an injection mold incorporating the safety device according to the present invention, the safety device being in the disassembled position, the mold not being mounted on an injection molding machine; and

[0031] FIG. 4 is a perspective section view of an injection mold incorporating the safety device according to the present invention, the safety device being in its mounted position, the mold being mounted on an injection molding machine.

PREFERRED EMBODIMENT OF THE INVENTION

[0032] As previously indicated, injection molds are made up of two parts, a fixed part, and a movable part, which allow them to be separated in order to obtain pieces during the injection molding process.

[0033] During the manufacturing process, these two parts are connected to an injection molding machine that allows the opening and closing of the molds in each injection cycle to obtain the manufactured piece, but when the molds are not mounted on the injection molding machines, it is essential to ensure that the two parts do not separate, as there could be a significant risk of an accident.

[0034] In order to ensure this condition, the safety device according to the present invention has been designed, which makes it possible to secure the joining of the two parts of the mold when it is not mounted on the injection molding machine.

[0035] This safety device ensures that when the mold is mounted on the machine, it allows the mold to open with the movements of the machine, but when the mold is not mounted on the machine, it ensures the joining of the two parts of the mold automatically.

[0036] In particular, the safety device according to the present invention comprises a plate (1) which is attached to the fixed part (11) of the mold, for example, by means of a screw (2). This plate (1) comprises a hole (13) for a safety shaft (10).

[0037] In order to position the plate (1) perfectly in relation to the fixed part (11), the plate (1) comprises a centering sleeve (3) which is recessed into the plate (1).

[0038] The safety device according to the present invention also comprises a base (4) attached to the movable part (12), for example, by means of a screw (5). Said base (4) comprises holes for housing the safety shaft (10) mentioned above and for housing a drive shaft (9).

[0039] The safety shaft (10) can be placed in two positions: an assembled position, in which the safety shaft (10) is housed in the bores of the plate (1), and a disassembled position, in which the safety shaft (10) is outside the bore of the plate (1).

[0040] In the assembled position, the mold is mounted on an injection machine, allowing the mold to be opened and closed, i.e., the movable part (12) of the mold to move relative to the fixed part (11), and in the disassembled position, the mold is not mounted on an injection machine, the mold being closed, preventing the movable part (12) from moving relative to the fixed part (11).

[0041] The drive shaft (9) is fitted with a rod (8), the length of which can be adapted to suit different mold widths by cutting the rod (8) to the required length. At the end of the rod (8) furthest from the base (4) there is a spring (6) and an actuator (7).

[0042] The mounting of the safety device according to the present invention on the mold is as follows. The mold has two parts which are separated from each other, the fixed part (11) and the movable part (12).

[0043] On the fixed part (11) of the mold is fixed the plate (1), while on the movable part (12) of the mold is installed the rest of the components of the device according to the present invention, i.e., the base (4), the drive shaft (9), the rod (8), the safety shaft (10), the spring (6) and the actuator (7).

[0044] When the mold is outside an injection molding machine, the device remains closed. This is achieved because the spring (6) pushes the drive shaft (9) and the rod (8) out of the mold, so that the safety shaft (10) is in the dismounted position, in which the safety shaft (10) is inserted into its hole (13) in the plate (1), thus making it impossible for the two parts (11, 12) of the mold to separate.

[0045] The movement between the drive shaft (9) and the safety shaft (10) is achieved, for example, by means of a gear system with inclined teeth which allow the safety shaft (10) to move perpendicularly to the drive shaft (9) when it is moved by the actuator (7) and the spring (6).

[0046] When the mold is mounted on the injection molding machine, the fixed part (11) of the mold is the first to be fixed to the machine, and the safety device according to the present invention ensures that the mold remains closed until the movable part (12) of the mold is fixed, as the safety shaft (10) remains inside the hole (13) of the plate (1).

[0047] When the moving part (12) of the mold is fixed to the injection molding machine, the actuator (7) moves the rod (8) and the drive shaft (9) to move the safety shaft (10) out of its hole (13) in the plate (1). In this way, when you want to open the mold by actuating the movements of the injection molding machine, the mold will open without difficulty.

[0048] To make it easier to understand the movements of the drive shaft (9) and the safety shaft (10), these are indicated in FIGS. 3 and 4 by the corresponding arrows.

[0049] Although reference has been made to a specific embodiment of the invention, it is obvious to a person skilled in the art that the security device described is susceptible to numerous variations and modifications, and that all the details mentioned can be replaced by technically equivalent ones, without departing from the scope of protection defined by the appended claims.