JPH06292623A - Mirror frame - Google Patents

Abstract

PURPOSE:To integrally and simultaneously form reinforce part or holes for fitting various accessories while keeping almost equal thickness and to provide the mirror frame with extremely high finish precision as well. CONSTITUTION:This mirror frame is formed from a synthetic resin to a hollow body by using a die provided with a movable core, a mirror board M is mounted to an opening part 12 at the center, an accessory rack 15 or the like is integrally formed, and a rib 23 for reinforce is integrally formed at a cavity 22.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a lens frame. More particularly, it relates to a barrel that is used extensively in the bathroom, bathroom, kitchen and other fields. The mirror frame used here includes a mirror, a cabinet in which doors, small shelves, etc. are formed.

[0002]

2. Description of the Related Art Conventionally, a lens frame formed of a synthetic resin and used in a washroom or the like is relatively inexpensive and lightweight, and is manufactured in large quantities.

These panels are usually manufactured by the procedure shown in FIG. That is, (1) First, a thermoplastic synthetic resin (mainly polystyrene or AB
(S resin is used) is formed into a sheet shape or such a sheet material 51 is purchased (FIG. 7 (a)). (2) Next, the sheet material 51 is plasticized by heating and then molded into male or female. It is set in a mold (a male mold is explained as an example) 52, and it is pressure-bonded to the molding mold by air pressure (FIG. 7 (b)), and the sheet material is cooled and molded into a desired shape (especially in the vacuum forming method). Often used).

(3) Excessive portion 53 such as a gripping portion of the molded material (hereinafter referred to as a molded product) is cut (trimming) to install electric wiring, a switch box, or a guard rail of a shelf. The hole 54 necessary for this is formed by punching or the like (FIG. 7C).

As described above, the molded product is finished through many steps, but in this state the rigidity is low and it is weak against external force such as twisting and bending, and therefore the following steps are required.

(4) A veneer plate, a particle board, or the like is attached to the back surface of the molded product 55 (the surface of the panel on the side where it is attached to the wall) for reinforcement. That is, first, the veneer plate 56 is cut into a shape that matches the inner peripheral edge shape of the back surface of the molded product 55, and a hole or the like for attaching to the wall surface is punched in the veneer plate 56, and a synthetic resin arugul material is provided around the veneer plate. Mount 57 with screws or glue.

(5) Next, the angle member is adhered to the inner peripheral edge of the back surface of the molded product to fix the veneer plate, and the end plate M is fitted on the front surface side for completion (FIG. 7).
(D)).

As described above, not only other members are required to reinforce the molded product, but also extremely laborious work is required.

Furthermore, even if the rigidity of the structure is improved as described above, there is an inherent problem of "uneven wall thickness" inherent in a molding method utilizing pneumatic pressure such as a vacuum molding method. That is, for example, in the case of vacuum forming,
Of the softened synthetic resin sheet, the portion that comes into close contact with the mold sooner and later is cured relatively quickly to become thicker, while the other portion (the portion that is stretched more) becomes thinner. Therefore, a weak portion is generated in a thin portion such that a dent is likely to occur and the portion is easily broken. If the overall thickness is increased in order to avoid such a problem, the amount of material used increases and the material cost increases.

The present invention has been made in order to solve such a problem. The wall thickness is almost uniform, and the reinforcing portion and the mounting holes for various equipment are integrally and temporarily molded, and the finishing accuracy is extremely high. It is intended to provide a mirror frame.

[0011]

The lens frame of the present invention is a lens frame which is formed by hollow molding and has a hollow portion in at least a part thereof, and the inner surface of a molding die which determines the final outer shape of the lens frame. The molten synthetic resin is released into the molten synthetic resin and a pressurized gas is injected into the molten synthetic resin to form a cavity in the molten synthetic resin, and at least a part of the mold is moved outward to form the cavity. Is expanded, and the molten synthetic resin is pressure-bonded (pressed) to the entire inner surface of the molding die by the pressurized gas.

Further, the hollow portion has a reinforcing rib connecting the two inner surfaces facing each other, and the reinforcing rib forms a gap corresponding to the rib in advance inside the cavity of the expandable mold. Preferably, the molten synthetic resin is discharged so as to fill the gap as well.

Further, an opening portion slightly smaller than the outer shape of the end plate to be attached is formed, and along the peripheral edge of the opening portion on at least one surface of the front surface and the back surface thereof, it corresponds approximately to the thickness of the end plate. It is more preferable that the end plate mounting step portion is formed.

[0014]

[Function] The synthetic resin molded product constituting the lens frame of the present invention is
By injecting a high-pressure gas at the time of molding, the molten synthetic resin material is brought into close contact with almost the entire inner surface of the cavity of the molding die, so that it has a substantially uniform wall thickness.

Moreover, since the internal pressure is applied by the high-pressure gas during the cooling of the synthetic resin material during molding, sink marks, warps, dents, etc. are unlikely to occur, and since the front and back are integrally molded, the rigidity is also high. There is.

Since the synthetic resin material is pressed against the inner surface of the cavity by high pressure so as to be brought into close contact with the cavity, it has an extremely high finishing accuracy (very faithful to the shape of the molding die) and also has a hole for mounting equipment. The concavo-convex portion and the reinforcing portion (for example, ribs connecting two wall surfaces facing each other in the hollow portion) and the like are integrally formed, and the dimensional accuracy is high. Therefore, the mirror can be easily attached.

Since the lens frame of the present invention is composed of such a molded product, it does not require trimming of the peripheral portion, perforation for mounting equipment, and mounting of a new reinforcing member.
A significant cost reduction can be achieved by reducing the amount of material and the number of manufacturing steps.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lens frame of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the lens frame of the present invention, FIG. 2 is a sectional view showing another embodiment of the lens frame of the present invention, and FIGS. FIG. 5 is a sectional view showing an example of a molding method in the manufacture of the lens frame of the present invention, and FIG. 6 is another molding method in the manufacture of the lens frame of the present invention. It is sectional drawing which shows the example of.

In FIG. 1, reference numeral 1 is a lens frame, which is molded from synthetic resin into a hollow body. It has a rectangular shape as a whole, and a shelf 2 for placing small items is formed at the lower end of the front surface thereof. In addition, a recess 3 for fitting the end plate M is formed in the center of the front surface, and an opening 4 (a size slightly smaller than the end plate M from the peripheral edge of the end plate M is formed in the bottom of the recess 3). The outer edge of the opening 4 is formed at least 2 mm inward. In this case, the opening 4 need not be provided in particular, but it can be said that it is preferable to provide it in order to save the synthetic resin material. Further, the depth of the recess 3 is not particularly limited, and it is also possible to make it have a stepless appearance by making it approximately equal to the thickness of the end plate M, or create a different taste as a deeper recess.

Although the lens frame 1 (FIG. 1) has the mirror plate M fitted from the front side, the present invention is not limited to this. For example, like the lens frame 5 shown in FIG. 2, the recess 6 is formed on the back surface side, and the mirror plate M
May be fitted from the back side. In this case, it is necessary to form the opening 7 at the bottom of the recess 6. The depth of the recess 6 and the size of the opening 7 are the same as the lens frame 1 described above.
It may be determined in the same manner as (FIG. 1).

As described above, since all the lens frames 1 and 5 are formed in a hollow shape over the entire circumference, even if the openings 4 and 7 are provided in the central portion, they have sufficient rigidity.

The lens frame 11 shown in FIG. 3 is to be installed on the wall surface above the wash bowl such as a washroom, and is a hollow body made of synthetic resin. An end plate M is fitted from the front surface in the substantially center of the end frame 11. End plate M of the lens frame 11
An opening is formed in the central portion into which is fitted, and a projecting piece 13 for fixing the end plate M is provided on the inner peripheral edge of the opening 12. In other words, like the lens frame 1 of FIG. 1, a recess for fitting the lens plate M is formed on the front surface.
The lens frame 11 is designed so that the depth of the recess is larger than the thickness of the mirror plate M. The lens frame 11 is also hollow around the entire circumference and has a substantially uniform wall thickness as described later. Therefore, as described above, the end plate M
Needless to say, even if the fitting portion of is opened, sufficient rigidity is maintained. And, the mounting hole 14 of the socket for the lighting fixture formed on the lens frame 11, the accessory shelf 15, and the slit 16 for the installation of the switch for the lighting fixture and the electric outlet all faithfully reproduce the cavity shape of the molding die. It is a thing. Further, 17 is a guard rail, 18 is a lighting light, 19 is a socket for the light 18, 19a is a decorative molding having a function of connecting a plurality of sockets 19, 20 is a switch for turning on / off the light 18, 21 is an electric outlet And is attached after the lens frame 1 is molded.

The lens frame 11 of this embodiment also has an opening in the central portion into which the mirror plate M is fitted in order to save material, but as described above, the present invention is not limited to such an opening. A single plate-shaped back plate may be integrally formed, or the back plate may be hollow. Further, according to FIG. 3, the accessory shelf 15 is hollow, but the present invention naturally includes a solid part of this part.

As described above, since the lens frames 1, 5 and 11 are hollow and integrally formed, the amount of material used is reduced and the rigidity is increased.

The lens frame 11 shown in FIG. 3 is provided with a reinforcing rib 23 for connecting the inner surface of the cavity 22 in the cavity 22 in order to further improve the rigidity.

Next, the lens frame 24 shown in FIG. 4 is a storage cabinet which is generally called a mirror cabinet and uses a mirror plate M for the door, and is widely used in a washroom, a bathroom and the like. The lens frame 24 has a box shape as a whole, and a plurality of storage shelves 25 are formed inside the lens frame 24, and is entirely hollow. The mirror plate M is attached to the front surface of the lens frame 24 so as to form a double door. Fluorescent lamps 26 for illumination housed in covers are attached to both outer sides of the end plate M.

The cavity is also formed in the lens frame 24 like the lens frame 11 in FIG.
Reinforcing ribs 28 that block the communication of 27 are interposed so as to connect the opposing wall portions. This rib 28 is a lens frame
The rigidity of 24 is further improved.

A groove 29 for wiring is formed on the back surface of the lens frame 24.

The external shape of the lens frame 24 formed as described above also faithfully reproduces the cavity shape of the molding die.

Next, with reference to FIG. 5, the method of molding the lens frame of the present invention will be modeled and briefly described.

As shown in FIG. 5 (a), the molding die 31 used for molding includes a mold 32, a fixed core 33 and a movable core 34 arranged in a recess of the mold 32, and It is composed of a spacer 35 arranged between the periphery of the die 32 and the core. Between the mold 32 and the movable core 34, and the fixed core
A gap 36 is formed between the movable core 34 and the movable core 34. In particular, the removable spacer 35 is used to form a gap at the inner peripheral edge of the mold 32. This is to make it easier to take out the molded product after molding.

First, the polypropylene, polyethylene, acrylonitrile-butadiene-melted polypropylene is melted from the injection port 38 into the cavity 37 formed by the above members 33, 34 and 35.
A thermoplastic synthetic resin (hereinafter referred to as resin) P such as styrene resin, polystyrene, polycarbonate, or polymethylmethacrylate is injected (FIG. 5A). A gas such as nitrogen gas, helium gas, or air that is pressurized with the injection of the resin P or after the injection is injected. At that time, resin P
Also fills the gap 36.

Then, as shown in FIG. 5B, the cavity 39 is formed by moving the movable core 34 in the direction in which the volume of the cavity 37 increases in accordance with the press-fitting of the gas. This movement is performed until the tip of the movable core 34 coincides with the end of the gap 36. By doing so, the portion of the resin P that is being intimately adhered to the inner surface of the cavity 37 and is being hardened is moved before and after the movement of the movable core 34 (cavity
Since it is not stretched through (before and after enlargement of 37), a thin part does not occur. Then, the resin P is cooled and cured while being pressurized with gas.

After the resin P is cured, the molding die 31 is disassembled and the molded product 40 is taken out as shown in FIG. 5 (c). With such a molding method, molding with a hollow ratio of 80% is possible.

When forming a reinforcing rib in the cavity 39, a gap 43 filled with the resin P is provided by providing an internal fixed core 42 of the movable core 41 as shown in FIG. 6A.
Is formed. Then, as shown in FIG. 6B, the ribs 44 are formed by moving the movable core 41 with the pressurization of the pressurized fluid.

In the lens frame formed as described above, it is difficult to obtain timber, and the price is rapidly increasing accordingly, so that the reinforcing rib is integrally formed, so that the manufacturing cost is significantly reduced. To be done. Moreover, many steps other than the molding step are not required, and the finish accuracy of the outer shape is extremely high, which facilitates automation such as assembly by a robot.

[0038]

The lens frame of the present invention has high strength and precision of the finished shape, and the number of manufacturing steps is greatly reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a lens frame of the present invention.

FIG. 2 is a sectional view showing another embodiment of the lens frame of the present invention.

FIG. 3 is a partially cutaway perspective view showing still another embodiment of the lens frame of the present invention.

FIG. 4 is a partially cutaway perspective view showing still another embodiment of the lens frame of the present invention.

FIG. 5 is an explanatory view showing an example of a molding method in manufacturing the lens frame of the present invention.

FIG. 6 is an explanatory view showing another example of the molding method in the production of the lens frame of the present invention.

FIG. 7 is an explanatory view showing an example of a conventional panel manufacturing method.

[Explanation of symbols]

 1 Mirror Frame 3 Recess 4 Opening 5 Mirror Frame 6 Recess 7 Opening 11 Mirror Frame 12 Opening 13 Projecting Piece 22 Cavity 23 Rib 24 Mirror Frame 27 Cavity 28 Rib 31 Mold 32 Mold 33 Fixed Core 34 Movable Core 36 Gap 37 Cavity 39 Cavity 41 Movable core 44 Rib

Claims (3)

[Claims] 1. A lens frame which is formed by hollow molding and has a hollow portion at least in a part thereof, wherein a molten synthetic resin is discharged to the inner surface of a molding die that determines the final outer shape of the lens frame, and a pressurized gas. By injecting into the molten synthetic resin, while forming a cavity in the molten synthetic resin to move at least a portion of the mold outward to expand the cavity,
A lens frame formed by press-bonding a molten synthetic resin to the entire inner surface of a mold with the pressurized gas. 2. The hollow portion has a reinforcing rib connecting the two inner surfaces facing each other, and the reinforcing rib forms a gap corresponding to the rib in advance inside the cavity of the expandable mold. The lens frame according to claim 1, wherein the lens frame is formed by discharging the molten synthetic resin so as to fill the gap. 3. An opening is formed which is slightly smaller than the outer shape of the end plate to be attached, and is substantially equivalent to the thickness of the end plate along the peripheral edge of the opening on at least one of the front surface and the back surface thereof. The lens frame according to claim 1, wherein a step portion for mounting an end plate is formed.