JP2626110B2 - Guard panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention mainly relates to a guard panel used for a VHS video cassette.

[Prior Art] FIG. 15 is a perspective view of a guard panel 1 attached to a VHS video cassette body (not shown) and serving to protect a magnetic tape.

The guard panel 1 includes an elongated front plate 1A and side plates 1B and 1C integrally formed at both ends of the front plate 1A. These side plates 1B and 1C are provided with guards on the cassette body. Hinge pins 2B and 2C for attaching panel 1 are formed so as to face each other. On the other hand, the front plate
At the lower end in the drawing of FIG. 1A, projecting portions 3 for engaging with the cassette body are formed so as to protrude on the same side as the side plates 1B and 1C. The hinge pin 2C is provided with a projection 2D for locking a spring. The spring biases the guard panel 1 in the closing direction.

FIG. 16 to FIG. 18 show an example of a mold conventionally used when molding the guard panel 1 having such a shape. In this mold, the front panel 1A of the guard panel 1 is formed perpendicular to the opening and closing direction of the mold. Therefore, in this mold, the hinge pins 2B and 2C are undercut.

In these figures, reference numeral 4 denotes a fixed-side receiving plate, on which a cavity plate 5 is fixed. A core plate 6 and a side plate 7 are arranged to face the cavity plate 5, and these plates 6 and 7 are supported by a movable-side receiving plate 8.

As shown in FIG. 18, the core plate 6 includes a movable core 6A fixed to the movable receiving plate 8, and a movable core 6A.
And slide cores 6B and 6C disposed on both ends of the slide core 6B. The slide cores 6B and 6C and the side plate 7 are moved by a slide core moving mechanism (not shown).
The moving operation is performed simultaneously in directions approaching and separating from each other (a direction orthogonal to the mold opening and closing direction). The movable core 6A defines a cavity for molding the front plate portion 1A including the undercut overhangs 3..., While the slide cores 6B, 6C and the side plate 7 define hinge pins 2B, 2C. A cavity for forming the side plate portions 1B and 1C having the shape is defined.

To release the guard panel 1 formed by the mold having the above structure, the mold is opened, and the slide cores 6B and 6C and the side plate 7 are separated from each other as shown in FIG. The guard panel 1 is moved, and the guard panel 1 is protruded from the mold by a protruding pin (not shown).

On the other hand, as a guard panel mold different from the above mold,
Those shown in FIGS. 19 to 21 are also used. In this mold, since the width direction of the front plate 1A of the guard panel 1 coincides with the opening / closing direction of the mold (the vertical direction in FIG. 19), the overhang formed at the lower end of the front plate 1A. 3 is undercut.

In the drawing, reference numeral 10 denotes a fixed-side receiving plate, on which a cavity plate 11 is fixed. Further, a core plate 13 defining a cavity 12 for forming the guard panel 1 by abutting a front end face of the cavity plate 11 is disposed to face the cavity plate 11. And this core plate 13 is movable side receiving plate
Supported by 14. Reference numeral 15 is a molten resin passage.

As shown in FIG. 21 (a plan view in a mold open state), the core plate 13 is configured to be movable by a slide core moving mechanism (not shown) in a direction orthogonal to the mold opening and closing direction. And the movable core 13 fixed to the movable receiving plate 14 at both ends of the slide core 13A.
B, 13C. The slide core 13A defines a part of the cavity 12 for forming the front plate portion 1A including the undercut overhang portions 3..., While the movable cores 13B and 13C define the hinge pin 2.
Cavity 1 for molding side plate portions 1B, 1C having B, 2C
Two other parts define.

After the guard panel 1 is molded in the mold, the mold is opened and the slide core 13A is opened by the slide core moving mechanism as shown in FIG.
Is separated from the guard panel 1, and then the guard panel 1 is protruded by a projecting pin (not shown) to be released.

Further, in the above mold shown in FIGS. 19 to 21,
After the mold is opened, the slide core 13A is protruded toward the cavity plate 11, and the guard panel 1 attached to the slide core 13A is sucked from the left side in FIG. A method of releasing the mold by separating it from 13A has also been proposed (see JP-A-61-145781).

[Problems to be solved by the invention]

However, in the above-described conventional guard panel mold, one of the outer surfaces of the front panel portion 1A having an L-shaped cross section of the guard panel 1 (the outer surface having a shorter width in FIGS. 16 to 18). Surface, the long outer surface in FIGS. 19 to 21) is arranged in parallel to the release direction,
There is a problem that these outer surfaces cannot be subjected to graining or engraving.

Therefore, the applicant has solved the above problem,
Proposed a new guard panel mold (Japanese Patent Application No. 63-1643)
No. 72). In this guard panel mold, as shown in FIGS. 22 to 24, the cavity plate 16 is formed so that the cavity plate 16 forms the outer surfaces of the front plate 1A and the side plates 1B and 1C of the guard panel 1. A mold cavity 17 (see FIGS. 22 to 24), a second mold cavity 18 for forming the upper surface of the hinge pin 2B of the side plate portion 1B (see FIG. 23), and the side plate portion
And a third mold 19 (see FIG. 24) for forming an upper surface of the hinge pin 2C of 1C, and a core plate.
20 is a first core mold 21 for forming the inner surface of the front plate 1A.
(See FIG. 22) and a second core mold 22 for forming the inner surface of the side plate portion 1B and the lower surface of the hinge pin 2B (see FIG. 23).
And the inner surface of the side plate 1C, the lower surface of the hinge pin 2C, the protrusion 2E
And a core pin 24 (see FIG. 24) for forming the end face of the protrusion 2E, and a direction orthogonal to the opening and closing direction of the mold (see FIG. 24). A slide core 25 (24th) is slidably provided in the longitudinal direction of the guard panel 1 and forms a recess of the side plate 1C.
(See the figure). In this guard panel mold, the upper plate 1D and the front plate 1E of the front plate 1A of the front panel 1A of the guard panel 1 to be molded intersect at right angles with each other at a predetermined angle with respect to the opening and closing direction of the mold. Because it is set to be inclined, on each outer surface of the upper plate portion 1D and the front plate portion 1E,
Graining and engraving can be applied.

By the way, in the guard panel mold, in order to smoothly release the projection 2E of the hinge pin 2C of the side plate portion 1C, as shown in FIG. Are matched. Therefore, the projection direction from the hinge pin 1C is different from the projection 2D of the conventional guard panel parallel to the front plate portion 1E, and a spring different from the conventional spring is prepared as the spring locked by the projection 2E. There is a need.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure in which a projection of a hinge pin is parallel to a front plate as in the related art, and is smoothly released from a mold. Guard panels that can be formed without fail and can be subjected to crimping and engraving on the outer surfaces of the upper plate and the front plate freely, in addition to being able to form reliably. Is to provide.

[Means for solving the problem]

In order to achieve the above object, a guard panel according to the present invention comprises an upper plate, a front plate formed at one end of the upper plate, and a circular plate formed on both sides of the upper plate and the front plate. It is composed of a pair of side plates forming a column-shaped hinge pin,
In a resin guard panel formed by a mold, one of the hinge pins formed on the both side plates is formed with a plane substantially parallel to a releasing direction, and a projection is formed on the one hinge pin. , The axis of which is formed parallel to the front plate.

[Action]

In the guard panel of the present invention, the upper plate and the cavity of the mold for molding the front plate are formed by a hinge pin having a plane substantially parallel to the releasing direction and a projection formed parallel to the front plate. When it is set to be inclined at a predetermined angle with respect to the opening / closing direction of the mold, the hinge pin and the projection can be easily released from the mold and can be molded smoothly.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 13.

1 to 10 show an example of a guard panel according to the present invention. The guard panel 30 is formed integrally with an elongated front plate 31 having an L-shaped cross section and at both ends of the front plate 31. In order to attach the guard panel 30 to the cassette main body, two types of short and long columnar hinge pins 34 and 35 are formed on these side plates 32 and 33 so as to face each other. ing. The front plate 31 is composed of an upper plate 36 and a front plate 37 which crosses the upper plate 36 at right angles and is formed wider than the upper plate 36.
At the end of 37, a convex portion 38 is formed so as to protrude on the same side as the side plates 32, 33.

Further, a plane 39 is formed on the hinge pin 35 at a predetermined angle with respect to the front plate 37 (substantially parallel to the release direction). It is formed parallel to the front plate 37. And this projection 40
As shown in FIG. 2, the portion 41 facing the front plate 37 is formed in a cylindrical peripheral surface, and the projection 40 has
The part 42 on the side farther from is formed in a plane. These portions 41 and 42 are connected by a pair of planes 43 and 44 parallel to each other.

At the base ends of the hinge pins 34, 35, recesses 45,
46 are formed respectively. On the inner surface of the side plate 33, a rectangular recess 47 for locking a guard panel rotation preventing stopper is formed.

The mold for molding the guard panel 30 having the above configuration is, for example, one shown in FIGS. 11 to 13, and FIG. 11 is a cross-sectional view of a mold part for molding the side plate 33 of the guard panel 30, and FIG. Is a sectional view of a mold part for molding the central part of the guard panel 30, FIG.
The figure is a cross-sectional view of a mold section obtained by cross-sectioning the guard panel 30 along the longitudinal direction. In these figures, reference numeral 50 denotes a cavity plate, and the cavity plate 50 is formed of a first mold 51 for forming the outer surfaces of the upper plate 36, the front plate 37, and both side plates 32, 33 of the guard panel 30 (FIG. 1). 11 to 13), the upper surface and the projection of the hinge pin 35 of the side plate 33.
A second mold 52 (see parting lines PL and FIGS. 11 and 11 in FIGS. 1 and 2) for forming 40 cylindrical peripheral portions 41 and planes 43 and 44, and the second mold The first mold pin 53 (see FIG. 11) is mounted on the mold 52 and forms the concave portion 46 at the base end of the hinge pin 35, and has the same structure as the second mold 52 and the first mold pin 53. The upper surface of the hinge pin 34 of the side plate 32 and a third mold type and a second mold pin (both not shown) for forming a concave portion 45 at the base end of the hinge pin 34 are integrally fixed to each other.

The cavity plate 50 has a core plate
54 are opposed to each other so that they can approach and separate from each other. The core plate 54 includes an upper plate 36 and a front plate of the guard panel 30.
The first core mold 55 (FIG. 12 and FIG.
13, a second core mold 56 for forming the inner surface of the side plate 32 and the lower surface of the hinge pin 34 (see FIG. 13), and a side plate 33.
A third core mold 57 (parting line PL of FIGS. 1 and 2) for forming the inner surface of the fin and the lower surface of the hinge pin 35, the flat portion 42 of the projection 40, and the two flat surfaces 43 and 44. And the second
13) and a fourth plate for forming an end surface of the side plate 32.
A core mold 58 (see FIG. 13) is provided so as to be slidable in a direction (longitudinal direction of the guard panel 30) perpendicular to the opening and closing direction of the mold, and to form the recess 47 of the side plate 33. And a slide core 59 (see FIGS. 11 and 13). The core plate 54 is supported by a core receiving plate 60.

At an end of the slide core 59, a slide core receiving plate 61 is installed. Between the slide core 59 and the slide core receiving plate 61, the slide core 59 is attached to the guard panel 30.
A spring 62 for urging inward in the longitudinal direction is mounted. A tapered surface 63 is formed on the slide core 59 on the cavity plate 50 side, and a side plate fixed to the first mold 51 of the cavity plate 50 is formed.
64 has a tapered surface 65 that contacts the tapered surface 63. And when the mold is closed, the above side plate
64 is configured to press the slide core 59 against the slide core receiving plate 61 against the urging force of the spring 62.

The cavity for the front plate 37 formed by the cavity plate 50 and the core plate 54 is inclined at a predetermined angle (for example, 35 °) with respect to the opening and closing direction of the mold. In FIG. 12, reference numeral 66 denotes a protruding pin for protruding the guard panel 30, and 67 denotes a molten resin passage.
The outlet (gate) of the molten resin passage 67 is connected to a guard panel.
A gate mark 48 is formed on the outer surface of the front panel 31 of the guard panel 30 after molding, as shown in FIG. 10. Have been.

When forming the guard panel 30 using the guard panel mold configured as described above, the molten resin is supplied from the injection molding machine into the mold with the mold closed as in the related art. As a result, the molten resin passes through the manifold and passes from the outlet of the molten resin passage 67 to the cavity plate 50.
And the core plate 54 is injected into a cavity formed between both engraved surfaces.

Then, after the guard panel 30 is cooled and solidified in the cavity after a predetermined time, the mold is opened. That is,
When the core plate 54 is separated from the cavity plate 50, the guard panel 30 in the cavity
It is separated from the cavity plate 50 side while being attached to the side. In this case, as for the hinge pin 35 and the projection 40, the upper surface including the plane 39 of the hinge pin 35, the cylindrical peripheral surface portion 41 of the projection 40, and the respective planes 43, 44 are formed by the cavity plate 5
On the 0 side, the lower surface of the hinge pin 35 and the planar portion 42 of the projection 40 and the respective flat surfaces 43 and 44 are respectively formed on the core plate 54 side, and the upper plate 36 and the front plate 37 of the guard panel 30 are formed.
Even if various patterns are formed on the engraved surface of the first mold cavity 51 of the cavity plate 50 in order to perform the embossing or engraving on both outer surfaces of the cavity plate 50, the engraved surface is at a predetermined angle with respect to the mold opening direction. Since it is set at an angle, there is no undercut, no obstacles when opening the mold, and it can be released smoothly and the guard panel 30 is a product.
Both the outer surface of the upper plate 36 and the outer surface of the front plate 37 can be satisfactorily embossed and engraved.

At this time, as the core plate 54 is separated from the cavity plate 50, the side plate 64 of the cavity plate 50 moves upward in FIG.
The slide core 59 having the tapered surface 63 in contact with the tapered surface 65 of the side plate 64 is urged leftward by the spring 62 with the movement of the side plate 64, and the core receiving plate 60
Slide along. As a result, the slide core 59 comes out of the recess 47 on the inner surface of the side plate 33 of the guard panel 30 formed by the slide core 59, and the undercut state of the recess 47 is eliminated.

In this state, the projecting pins 66 are operated to move the guard panel 30 from the core plate 54 to the cavity plate 50.
Protrude to the side and release.

In the above embodiment, as shown in FIG.
Although the cross section of the projection 40 has been described as having an irregular shape, a columnar projection 49 may be used as shown in FIG.

〔The invention's effect〕

As described above, the guard panel of the present invention includes an upper plate, a front plate formed at one end of the upper plate, and a columnar shape formed on both sides of the upper plate and the front plate, and on the inner surface. A guard panel made of a resin and formed of a pair of side plates on which hinge pins are formed, wherein one of the hinge pins formed on the both side plates has a flat surface substantially parallel to the release direction. Since the projection is formed on the one hinge pin and the axis thereof is formed parallel to the front plate, the cavity of the mold for forming the upper plate and the front plate is formed in the opening and closing direction of the mold. When set at a predetermined angle, the hinge pin formed with a plane substantially parallel to the release direction and the projection formed parallel to the front plate smoothly release the hinge pin and the projection. By doing, the product In addition to being able to form reliably, the outer surfaces of the upper plate and the front plate can be freely subjected to embossing and engraving, so that there is no restriction on the design of the appearance pattern and projections from the hinge pins Can be made to project in the same manner as in the past.

[Brief description of the drawings]

1 to 13 show an embodiment of the present invention.
1 is a detailed view of a main part, FIG. 2 is a view taken along the line II-II of FIG. 1, FIG. 3 is a plan view of a guard panel, FIG. 4 is a front view thereof, and FIG. Fig. 6, Fig. 6 is the rear view, Fig. 7 is the left side view, Fig. 8 is the right side view, and Fig. 9 is IX- in Fig. 4.
FIG. 10 is a perspective view, FIG. 11 is a cross-sectional view of a mold part forming the side panel 33 of the guard panel, and FIG. 12 is a cross-sectional view of a mold part forming the central part of the guard panel. FIG. 13 is a cross-sectional view of a mold section cut along the longitudinal direction of the guard panel,
FIG. 14 is a detailed view of a main part showing another embodiment of the present invention.
15 is a perspective view showing a conventional guard panel, FIGS. 16 to 18 show an example of a conventional guard panel mold, FIG. 16 is a sectional view, and FIG. 17 is a core when the mold is opened. FIG. 18 is a cross-sectional view of a plate portion, FIG. 18 is a plan view of a core plate portion, and FIGS. 19 to 21 show another example of a conventional guard panel mold. The figure is a cross-sectional view of the core plate portion when the mold is opened, FIG. 21 is a plan view of the core plate portion, and FIG.
FIGS. 22 to 24 show another example of a conventional guard panel mold. FIG. 22 is a cross-sectional view of a mold portion for molding a central portion of the guard panel, and FIG. 23 is one side of the guard panel. FIG. 24 is a cross-sectional view of a mold portion for forming the side plate portion, and FIG. 24 is a cross-sectional view of a mold portion for forming the other side plate portion of the guard panel. 30 Guard plate, 32, 33 Side plate, 34, 35 Hinge pin, 36 Upper plate, 37 Front plate, 39 Flat, 40, 49
... projections, 41,42 ...

Claims (1)

(57) [Claims] An upper plate, a front plate formed at one end of the upper plate, and a pair of side plates formed on both sides of the upper plate and the front plate and having cylindrical hinge pins formed on inner surfaces thereof. And a resin guard panel formed by a mold, wherein one of the hinge pins formed on the both side plates has a plane substantially parallel to a releasing direction, and the one hinge pin has A guard panel, wherein the projection is formed so that its axis is parallel to the front plate.