JPH0755770Y2 - Vehicle lamp protector mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vehicular lamp, and more specifically, a flange-shaped portion provided on an outer periphery of an opening of a front surface of a lamp housing is made of a material having a flexible rubber elasticity. The present invention relates to a protector mounting structure for a vehicle lamp having a structure in which a protector is integrally formed.

[Conventional technology]

In a vehicular lamp that abuts on a vehicle body panel, for example, a rear combination lamp, a lamp housing or the like is made of a synthetic resin product, and the material is plated or painted. Then, a protector is attached to the edge portion that comes into contact with the vehicle body panel. This protector is an extruded or injection molded soft synthetic resin or rubber molded product.

To attach this protector to the peripheral edge of a lamp housing, etc., it has been customary to apply an adhesive to the inner bottom surface of the protector, fit it along the peripheral edge of the housing, temporarily fix it with adhesive tape, etc., and then place it inside the opening. It is adhered to the lamp housing etc. by applying an adhesive and mechanically caulking it.

In such a conventional vehicle lamp, molded articles such as synthetic resin or rubber are used as the protector, which are preliminarily molded by a molding machine, which is a pressure sensitive adhesive, a pressure sensitive adhesive tape and an adhesive or mechanical caulking or these. Since it is a process of fixing and mounting with a composite of, the factory that manufactures the protector and the factory that assembles the protector on the rim, housing, etc. are usually separate factories. There were problems such as dirt, peeling due to the repulsive force of the protector itself, and a long holding time until the occurrence of adhesive strength.

Further, depending on the type of adhesive, special consideration is required for the health management of the worker.

Therefore, the present applicant aims to improve the above-described conventional vehicular lamp, and a vehicular lamp in which a protector made of a heat-meltable elastic material is integrally formed on the peripheral portion of a housing, a rim, a lens, etc. Application for Japanese Patent Application No. 58-65001)
It is known.

In order to configure the peripheral protector of the lamp housing by applying the above-mentioned known technique, first, the surface treatment is performed on the void portion of the mold made of metal such as iron or aluminum or the heat-resistant synthetic resin, or the silicone-based releasing agent. Apply. Next, a ready-made lamp housing is set in a mold, the lamp housing and the mold are mechanically tightened, a nozzle is connected to the injection hole of the mold via an applicator and a pump, and a heat-melting elastic body is attached. inject. Then, the heat-meltable elastic body is injected along the void portion at the periphery of the lamp housing set in the mold. After filling the heat-melting elastic body sufficiently, remove the pump and nozzle from the injection hole and forcibly cool it or let it cool naturally to solidify the heat-melting elastic body, and unclamp the mold. And the protector are integrated to obtain a vehicular lamp.

Such a vehicle lamp uses the fluidity of the heat-meltable elastic body at high temperature and the solidified shape retention property at low temperature to form a protector integrally with the lamp, so that stains due to an adhesive, a defect in shape, Since the trouble such as the outflow of the adhesive is eliminated and the process is simplified, the assembling cost can be significantly reduced, and the health problems of the worker regarding the adhesive do not occur. Further, since the low pressure molding is performed, the equipment and the mold are simple, and the cost can be reduced.

FIG. 2 is a sectional view showing a conventional example of a vehicular lamp equipped with a protector.

A hot melt groove 1a is formed in the opening of the lamp housing 1, a leg 2a of the front lens 2 is inserted into the hot melt groove 1a, and an adhesive (hot melt) 3 is filled in the gap. Reference numeral 4 is a light source bulb.

In order to mount this lamp on the vehicle body panel 5, the protector 6 is integrally formed on the outer periphery of the opening of the lamp housing 1, specifically, on the outside of the hot melt groove 1a.

FIG. 3 is an explanatory view showing a state in which the protector is integrally molded by applying the above-mentioned known technique.

The ready-made lamp housing 1 is sandwiched and inserted between the mold (A) 7 and the mold (B) 8.

The mold (A) 7 is provided with a cavity 7 a in contact with the flange-shaped portion on the outer periphery of the lamp housing 1. When the heat-melting elastic body is injected into the cavity 7a, the protector is molded integrally with the lamp housing 1.

As shown in FIG. 3, a cavity formed by sandwiching a flange-shaped portion 1b formed on the outer periphery of a preformed lamp housing 1 between two molds A and B, and adjoining the flange-shaped portion 1b. 7a
When a protector is molded by injecting a heat-meltable elastic body into the, if there is no affinity between the synthetic resin that forms the lamp housing and the heat-meltable elastic body that forms the protector, both There is a problem that they are not glued.

If the protector is not attached to the flange-shaped portion on the outer periphery of the lamp housing, it is not easy to assemble a vehicular lamp using this lamp housing. Also,
Not only is it inconvenient to transport and store the assembled lighting fixture to the vehicle body, but also the mounting work is difficult. That is,
Even when a skilled person performs the mounting work, considerable care and labor are required, and when the unskilled person performs the mounting work, there is a possibility that the protector may be out of contact or may not be adhered to the protector.

However, the synthetic resin material that molds the lamp housing is
In addition to the physical properties required for injection molding, heat resistance, rigidity and strength are required. If the heat resistance is insufficient, the lamp housing may be heated and deformed by the heat generated by the light source lamp when the vehicular lamp is used.

Further, the heat-melting elastic body forming the protector is required to have rubber-like elasticity and durability which can function as a seal packing in addition to the physical properties required for injection molding. This is because if the rubber-like elasticity is insufficient, or if it hardens or becomes brittle over time, it cannot function as a protector.

If it is attempted to select the material of the lamp housing and the material of the protector within the range of such selection conditions, it is difficult to make both materials compatible or compatible with each other.

For example, ABS (acrylonitrile-butadiene-styrene resin) is suitable as a molding material for the lamp housing, and thermoplastic elastomer is suitable as a molding material for the protector. However, ABS and thermoplastic elastomer have no compatibility with each other, and therefore they do not melt each other. Don't wear

In particular, when metal plating (for example, chrome plating) is applied to the flange-shaped portion of the lamp housing formed of a synthetic resin material, it does not fuse with all currently known heat-meltable elastic materials.

When a molded lamp housing is sandwiched between two molds and a protector is injection-molded in the cavity provided in the mold, even if there is no affinity between the lamp housing molding material and the protector molding material. To mechanically join both members together, sandwich the flange-shaped part provided on the outer periphery of the pre-formed synthetic resin (may be metal plated) lamp housing with two molds. When the heat-meltable elastic material is injected into the cavity provided in at least one of the two molds by contacting with the flange-shaped portion, the flange-shaped portion of the lamp housing is previously prepared. It is effective to provide unevenness. As a result, the protector is provided with protrusions and recesses having a shape obtained by reversing the above-mentioned concavities and convexities, and both concavities and convexities are fitted together, and a mechanical joining effect is expected.

As a concrete configuration based on the above-mentioned principle, in a vehicular lamp in which a protector is injection-molded in contact with a flange-shaped portion of a lamp housing, the protector has a U-shaped cross section and the front surface of the flange-shaped portion. And a side surface that is in contact with the outer peripheral side surface and the back surface, a through hole that connects the front surface and the back surface is provided in the flange-shaped portion, and a columnar portion that connects two parallel U-shaped surfaces is provided in the protector. It is conceivable that the columnar portion is fitted into the through hole. This structure is a device created by the present inventors and being applied for by the present applicant (actual application No. 2-3134, hereinafter referred to as a prior application).

According to the configuration of the invention of the above-mentioned prior application, since the through hole provided in the flange-shaped portion on the outer periphery of the lamp housing and the columnar portion provided in the protector are fitted, the flange-shaped portion of the lamp housing is fitted. And the protector are mechanically engaged.

Therefore, even if there is no compatibility or compatibility between the material forming the lamp housing and the material forming the protector, both members are mechanically engaged, so that they are easy to handle and have a protector. After manufacturing the lamp housing of 1., it is easy to assemble the lamp by attaching the constituent members as the lamp, and in addition, it is easy to transport and store the assembled lamp. The assembly work does not require skill and can be assembled quickly and easily.

[Problems to be solved by the device]

FIG. 4 (A) is a sectional view of a vehicular lamp having an embodiment of a protector mounting structure according to the invention of the prior application.

The front lens 2, the light source bulb 4, and the vehicle body panel 5 having the same reference numerals as those in the conventional example are the same or similar constituent members as in the conventional example.

FIG. 6 (B) shows an enlarged detailed view of the portion B of FIG. 4 (A).

A hot melt groove 1a is formed around the front opening of the lamp housing 1 '. Then, the leg 2a integrally formed with the front lens 2 made of synthetic resin is inserted into the hot melt groove 1a and joined by the hot melt 3 which is a thermoplastic adhesive.

In the lamp housing 1 ', a flange-shaped portion 1b is formed on the outer peripheral side of the hot melt groove 1a, and a protector 9 having a U-shaped cross section is formed by contacting the front surface, the outer surface and the rear surface thereof.
Is provided.

A through hole 1c is provided that connects the back surface and the front surface of the flange-shaped portion 1b.

On the other hand, a columnar portion 9a is formed on the protector 9 and is fitted in the through hole 1c.

The protector mounting structure of this example is configured as described above, and the protector 9 is mechanically coupled to the flange-like portion 1b of the lamp housing and easily peeled off even if there is no affinity or compatibility between the two materials. do not do.

In this way, the protector 9 becomes the lamp housing 1 '.
Since it is attached to the flange-shaped portion 1b of the lamp, the work for assembling the vehicle lamp by attaching the constituent members as the lamp (for example, the light source bulb 4 and the front lens 2 shown in FIG. 4A) to this lamp housing 1 ' Easy to do.

In addition, the assembled vehicular lamp is easy to transport and store, and in particular, the assembled vehicular lamp can be easily assembled to the vehicle body and can be quickly assembled without requiring any skill. There is no risk of improper assembly such as sticking out or sticking.

FIG. 5 is a partially cutaway perspective view of the lamp housing 1 '.

FIG. 6 is an explanatory diagram of a method of constructing the protector mounting structure shown in FIG. 4, and is a diagram corresponding to FIG. 3 in the above-mentioned known example.

A mold (A) 7, a cavity 7a, and a mold (B) 8 having the same drawing reference numbers as in the known example are the same members as in the known example.

The lamp housing 1'is a member corresponding to the lamp housing 1 in the above-mentioned known example, but the lamp housing 1'of this example is provided with a through hole 1c on the rear surface side (the lower surface side in the drawing) of the flange portion 1b. .

In this manner, the nozzle (neither is shown) is connected to the injection hole provided in the mold through the applicator and the pump, and the heat-melting elastic body is injected, as in the known example. . Then, the heat-meltable elastic body is injected along the void portion at the periphery of the lamp housing set in the mold. When the heat-melting elastic body is sufficiently filled, remove the pump and nozzle from the injection hole and forcibly cool or naturally cool the heat-melting elastic body to solidify it, and unclamp the mold. A member in which the protector and the protector are integrated is obtained, and the molded protector has a through hole.
A columnar portion corresponding to 1c is formed.

In this way, the protector mounting structure has a through hole provided in the flange-like portion 1b of the lamp housing 1 '.
Since it can be configured by using the protector molding die (A) 7 and the mold (B) 8 in the conventional example, the existing facility for protector injection molding of the conventional example can be used without making a large modification. Since the lamp housing and the protector are engaged with each other even if there is no affinity or compatibility between the constituent material of the lamp housing and the constituent material of the protector, they are separated from each other. The bonded state is maintained without doing.

Therefore, the assembling work for constructing the vehicular lamp can be easily performed by incorporating the constituent members for the lamp into the lamp housing.

In addition, the assembled vehicular lamp can be easily packed for transportation, and handling during transportation is extremely easy.

In particular, when the assembled vehicular lamp is assembled to the vehicle body, the protector is fixed to the flange-shaped portion of the lamp housing so that the protector is not displaced from the predetermined position or protruded.

Therefore, it is possible to quickly and easily assemble the vehicular lamp to the vehicle body without requiring special skill, and there is a risk that misalignment of the protector, protrusion of the protector, or poor adhesion of the protector may occur. There is no.

The columnar portion 9a of the protector 9 appears in the cross section of the protector mounting structure according to the invention of the earlier application shown in FIG. 4 (B). The columnar portion 9a is a plane shown in FIG. 7 (A). As shown by the shaded lines in the figure, the columns 9a are arranged at regular intervals, and the columnar portions 9a are hidden as shown in FIG.

When injection molding the protector 9 into a mold,
There is a problem of volume reduction (so-called sink mark) at the time of temperature solidification.

In general, sink marks are likely to occur in the thick wall portion, and the columnar portion 9a is also a kind of thick wall portion. Therefore, in FIG. 7A, which is a plan view, the inner edge 9b of the protector 9 has a columnar portion 9a.
Is locally attracted by and is distorted into a wavy shape as shown.

Since this part is a place that appears in the appearance, if the edge 9b is distorted in a wavy shape, the commercial value is reduced.

The present invention has been made in view of the above circumstances, and improves the protector mounting structure according to the invention of the prior application, so that the advantages of the invention of the prior application (the compatibility between the lamp housing material and the protector material or The purpose of the present invention is to provide a protector mounting structure in which the appearance is not deteriorated by the corrugated distortion of the inner edge of the protector without impairing the mechanical coupling even if there is no compatibility). To do.

[Means for Solving the Problems]

The basic idea of the present invention, which was created to achieve the above-mentioned object, is to cover the inside edge of the protector, which is not visible in appearance, with a part of the lamp housing.

The present invention as a concrete structure based on the above-mentioned principle is a vehicular lamp in which a protector is injection-molded in contact with a flange portion of a lamp housing, wherein the protector has a U-shaped cross section. Is in contact with the front surface, the outer peripheral side surface, and the back surface of the flange portion, and the flange portion is provided with a through hole that connects the front surface and the back surface, and is located around the lamp housing on the front side of the flange portion. At most, a groove is provided, and the protector is provided with a columnar portion connecting the U-shaped parallel two surfaces, and the columnar portion is fitted into the through hole, and the U-shaped parallel two-sided surface is provided. One of the two is fitted into the groove.

[Action]

According to the above configuration, the inner peripheral edge of the protector is fitted in the groove around the lamp housing and does not appear in appearance.

Therefore, there is no fear of damaging the appearance even if the wavy distortion occurs on the inner peripheral edge.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of a protector mounting structure according to the present invention.

This embodiment is an example improved by applying the present invention to the protector mounting structure according to the invention of the prior application shown in FIG. 4 (B).

In FIG. 1, those denoted by the same reference numerals as those in FIG. 4 (A) are the same or similar components as in the protector mounting structure according to the invention of the previous application.

Next, the difference between the embodiment of the present invention shown in FIG. 1 and FIG. 4 (A) according to the invention of the prior application will be described.

A groove 1d is provided in the lamp housing 1 ″.

The groove 1d is formed in the periphery of the lamp housing so as to be located in front of the lamp with respect to the flange portion 1b. As a result, the groove 1d becomes a ring-shaped groove.

When the protector 9'is injection-molded by using the above-described known technology (Japanese Utility Model Application No. 58-65001) by using the lamp housing 1 "having such a structure, the inner flange-like shape fitted in the groove 1d is formed. The edge 9f is integrally connected to the protector 9 '.

As can be easily understood from FIG. 1, the inner edge 9f of the protector 9 ′ is not affected by the lamp when viewed from the front in the direction of arrow F or obliquely in the direction of arrow f or arrow f ′. Since it is hidden in the groove 1d of the housing 1 ″, it is hidden and invisible. Therefore, a wavy distortion is generated at this edge 9f (see FIG. 7 (A)).
(See), there is no risk of damaging the appearance and reducing the commercial value.

[Effect of device]

As described above, according to the protector mounting structure of the present invention, both members are mechanically coupled even if there is no affinity or compatibility between the lamp housing material and the protector material. It is possible to completely prevent the appearance of the wavy distortion of the inner edge of the protector, which is a disadvantage of the invention of the prior application, without impairing the advantages of the invention of the application of the invention.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a protector mounting structure according to the present invention. FIG. 2 is a cross-sectional view showing a conventional vehicle lamp, and FIG. 3 is an explanatory view of a protector structuring method according to a known technique. FIG. 4 (A) is a sectional view of a vehicular lamp equipped with an embodiment of a protector mounting structure according to the invention of the prior application, and FIG. 4 (B) is an enlarged detailed view of part B thereof. FIG. 5 shows one of the lamp housings in the invention of the above-mentioned prior application.
FIG. 6 is a perspective view showing an example, and FIG. 6 is an explanatory view of a method of constructing the protector. 7 (A) and 7 (B) are explanatory views of the problems in the invention of the above-mentioned prior application. 1,1 ′, 1 ″ …… Lamp housing, 1a …… Hot melt groove, 1b …… Flange part, 1c …… Through hole, 1d …… Groove, 2 ...
... front lens, 2a ... legs, 3 ... hot melt, 5 ...
Body panel, 6,9,9 '…… Protector, 9a …… Column, 9
f …… Inner flange-shaped part.

Claims (1)

[Scope of utility model registration request] 1. A vehicular lamp in which a protector is injection-molded in contact with a flange portion of a lamp housing, wherein the protector has a U-shaped cross section, and the flange portion has a front surface, an outer peripheral side surface, and a rear surface. The flange-shaped part is provided with a through hole that communicates the front side and the back side, and a groove is provided around the lamp housing so as to be positioned on the front side of the flange-shaped part. Is provided with a columnar portion that connects two U-shaped parallel surfaces, and the columnar portion is fitted into the through hole, and one of the U-shaped parallel two surfaces is fitted into the groove. A structure for mounting a protector for a vehicle lamp, which is characterized in that