JPS6142243Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicular lamp. For more details,
This invention relates to a vehicular lamp in which a waterproof cover covers an opening for attaching and detaching a light source bulb provided in a housing containing a reflector.

[Prior art]

Traditionally, vehicle lighting equipment such as head lamps and photo lamps have been used under harsh conditions, and if waterproofing measures are not sufficient, water may enter the lamp chamber, shortening the lamp's lifespan or damaging the lens. Moisture adheres to the inner surface, causing a clouding phenomenon and a decrease in luminous flux. Therefore, even if the lamp is of a type in which a reflector holding a light source bulb is disposed within a lamp chamber defined by a housing and a lens disposed on the front surface of the housing, the light source bulb formed at the rear of the housing is A waterproof cover is placed over the opening for attachment/detachment, and two types of attachment structures have been proposed as methods for attaching this waterproof cover.

One is a structure in which a spiral protrusion formed on the periphery of the waterproof cover is screwed into a spiral groove formed in the valve attachment/detachment/exchange opening of the housing. the other one
First, a waterproof cover is made of an elastic material such as rubber and is placed over the valve replacement/removal opening, and the center hole provided in the waterproof cover is brought into close contact with the valve cap, and the valve cap protrudes from the waterproof cover. It has a structure that allows

[Problem that the invention attempts to solve]

However, in the former proposed conventional method, a minute gap is created between the threaded groove and the spiral protrusion, so water can enter the lamp chamber through this gap. There is. In the case of the latter, when used at low temperatures, moisture adhering to the outside of the waterproof cover freezes and impedes its elasticity.
For this reason, there are disadvantages in that the angle of the reflector cannot be adjusted or cracks occur due to changes over time, allowing water to enter the lamp chamber.

In view of the above circumstances, it is an object of the present invention to provide a vehicular lamp equipped with a waterproof cover that has excellent waterproofness, is easy to install, and has adequate ventilation between the lamp chamber and the atmosphere. This is the purpose.

The ventilation problem mentioned above is a technical problem unique to lamps; if the lamp chamber is completely sealed from the atmosphere, the internal pressure will rise as the light source bulb turns on and the temperature rises inside the lamp chamber. There is a risk of damage.

For this reason, breathability is required to maintain a balance between internal and external pressure without interfering with waterproofness.

[Means for solving problems]

In order to achieve the above object, the present invention is constructed as follows.

(b) Mainly to facilitate attachment and detachment of the waterproof cover, a pair of hooks with an L-shaped cross section are formed on the back of the housing, and the waterproof cover is provided with a plate-shaped spring rotatably pivoted approximately at the center of the outer surface. and is configured to rotate the plate spring to engage the pair of hook portions and press the waterproof cover against the housing.

(b) In order to maintain appropriate ventilation, the waterproof cover is a short cylindrical member with a bottom and no top, and an annular groove is provided on the end surface of the cylindrical part, and the groove near the opening Expanding the width, fitting a packing ring into the widened wide part, compressing and interposing the packing ring between the waterproof cover and the housing,
As described above, the opening of the annular groove is closed with a packing ring to form an annular gap near the bottom of the groove, and an outer communication hole is provided to communicate the gap with the atmosphere, and the gap is communicated with the lamp chamber. an inner communicating hole is provided, and the locations where the inner and outer communicating holes are installed are spaced apart in the same direction of the cylindrical portion of the waterproof cover;
The air inside the lamp chamber is configured to communicate with the atmosphere through the inner communication hole, approximately half the circumference of the annular gap, and the outer communication hole.

[Effect]

In the vehicle lamp constructed as described above, the waterproof cover can be easily attached and detached by engaging and disengaging the plate spring from the L-shaped hook portion.

Furthermore, since the interior of the lamp chamber communicates with the atmosphere through the annular gap, adequate ventilation can be obtained without impeding waterproofness.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to an illustrated embodiment.

Reference numeral 1 denotes a container-shaped housing. An opening 11 is formed at the rear of the housing 1, and a lens 2 is disposed at the front. is provided with a reflector 3 holding a light source bulb 31,
The opening 11 is covered with a waterproof cover 4. The waterproof cover 4 has a plate spring 5 rotatably attached to its rear surface, and the waterproof cover 44 rotates the plate spring 5 and locks it to a pair of hooks 14 and 14 formed on the outer surface of the housing 1. As a result, they are pressed together via the packing ring 6.

Specifically, in this example, an edge 12 having a concave portion is formed around the front opening of the housing 1, and the peripheral leg portion 2 of the lens 2 is attached to this concave portion via an adhesive 9.
1 is inserted, and the peripheral leg portion 21 of the lens 2 and the edge 21 of the housing 1 are held and reinforced by a clip 91. A mounting portion 13 formed in the shape of an inner flange is provided around the opening 11 of the housing 1, and hook portions 14, 14 each having an L-shaped cross section are provided on the rear outer surface of the housing 1, as shown in FIG. The opening surfaces 14a of the hook portions 14, 14 are formed as inclined surfaces to facilitate the reception of the plate-shaped springs 5 shown by broken lines, and the opening surfaces 14a of the hook portions 14, 14 are formed as inclined surfaces to facilitate the reception of the plate-shaped springs 5 shown in broken lines. 14b prevents the plate spring 5 from coming off from the hook portion 14.

The reflector 3 is in such an example the housing 1
The bulb 31
The filament is detachably held from the rear (opening 11 side) so as to be located approximately at the focal point of the reflector 3, and the front surface of the bulb 31 is covered with a light shielding plate 32 fixed to the reflector 3.

The waterproof cover 4 is made of synthetic resin such as polypropylene (PP), and as shown in FIG. A bottomed cylindrical screw receiving seat portion 43 is formed approximately in the center of the main body portion 41, and a pair of through holes 44, 44 are formed on the left and right sides. A grommet mounting hole 46 is provided between the through hole 44 and the screw receiving seat portion 43, and the upper portion thereof is covered by a semicircular collar portion 45. The opening end 43a of the screw receiving seat 43 is connected to the main body 4.
1, and a pair of through holes 44, 44.
is formed on the lower surface of the inclined portion 41a that projects from the main body portion 41 so as to face downward. Further, an annular groove 47 that reaches the main body 41 is formed in the peripheral leg 42, and the groove 47 divides the peripheral leg 42 into an outer peripheral wall 42a and an inner peripheral wall 42b. The groove 47 is formed to be wide on the opening side, and when a packing ring 6 made of an elastic material such as rubber and having a roughly elliptical cross section shown in FIG. 47b
becomes an annular gap communicating with the pair of through holes 44, 44 mentioned above. Then, a small hole 48 is formed above the inner circumferential wall 42b to form a narrow part (annular space) 47 inside the lamp chamber.
b, and a small hole 49 also exists below the outer peripheral wall 42a.
The narrow portion (annular gap) 47b is communicated with the outside air to form a ventilation path, thereby reducing the difference in pressure change between the inside of the lamp chamber and the outside air due to turning on and off.

As shown in FIG. 8, the plate spring 5 is formed to have a substantially arcuate cross section so as to exert a restoring force when it is engaged with the hook portions 14, 14, and both longitudinal ends are bent to form a reinforcing structure. At the same time, a mounting hole 51 is provided approximately in the center.

The plate spring 5 configured in this manner can be rotated by fitting the mounting hole 51 into the screw receiving seat 43 of the waterproof cover 4 and screwing the screw 7 through the screw receiving seat 43 via the washer 71. The waterproof cover 4 will be installed.
is placed on the placing part 13 of the housing 1 via the packing ring 6 fitted into the wide part 47a of the groove part 47, and the plate spring is rotated to attach the hook part 14,1.
Lock at 4. Then, the restoring force of the plate spring 5 causes the waterproof cover 4 to be pressed against the housing 1 via the packing ring 6. Note that 8 in the figure is a grommet press-fitted into the grommet mounting hole 46, and cords 34a and 34b for supplying power to the valve 31 are led out from this grommet 8.

Therefore, in the present invention, the plate spring 5 presses the packing ring 6 through the waterproof cover 4, thereby preventing water from entering.
Since the plate-shaped spring 5 is mounted approximately at the center of the outer surface of the waterproof cover 4, the pressing force due to the restoring force of the plate-shaped spring 5 is applied almost uniformly to the outer circumference of the waterproof cover 4, thereby causing the packing ring 6 to Since the pressure is applied evenly, the sealing performance can be stabilized and the waterproof effect can be enhanced. Further, when locking the plate spring 5, since the opening surfaces 14a of the hook parts 14, 14 are inclined, the plate spring 5 can be easily locked to the hook parts 14, 14 by simply rotating it. Since the locking is performed by rotation, the housing 1 can be made compact without requiring much space at the rear.

As is clear from the above embodiments, the present invention has a reflector holding a bulb inside a lamp chamber defined by a housing with a bulb insertion hole formed at the rear and a lens disposed on the front of the housing. ,
In the vehicle lamp comprising a waterproof cover covering the bulb insertion hole, a pair of hook portions are formed on the outer surface of the housing, and the waterproof cover includes a plate-shaped spring rotatably mounted approximately in the center of the outer surface. , rotating the plate spring of the waterproof cover placed on the housing via a packing ring to lock the plate spring to the pair of hooks, and press the waterproof cover to the housing via the packing ring; Because of this, it is easy to attach and detach, and the substantially uniform pressing force provides a waterproof effect with stable sealing performance. Moreover,
Since the interior space of the lamp is communicated with the atmosphere through the annular gap, excellent effects such as maintaining appropriate ventilation without impairing waterproofness can be obtained.

It should be noted that, as a matter of course, the present invention is not limited to the above embodiments.

[Brief explanation of drawings]

The accompanying drawings show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is a sectional view taken along the line -
The figure is a sectional view taken along the - line in Fig. 1, Fig. 4 is an enlarged rear view of the main part of Fig. 1, Fig. 5 is a sectional view taken along the - line in Fig. 4, and Fig. 6 shows the waterproof cover. Figures 1 and 2 are sectional views taken along the - line of figure A, and figures C are - of figure A.
Figure 7 is an enlarged line sectional view, Figure 7 shows the packing ring, Figure A is a front view, Figure B is a sectional view taken along the - line of Figure A, and Figure 8 shows the packing ring.
The figures show a plate-shaped spring, and Figure A is a front view, Figure B is a cross-sectional view taken along the line - - of Figure A, and Figure C is a cross-sectional view taken along the line - - of Figure A. 1...Housing, 11...Opening, 13...
Placement part, 14... Hook part, 14a... Opening surface,
14b...Protrusion, 2...Lens, 3...Reflector, 31...Bulb, 4...Waterproof cover, 41
. . . Main body, 42 . . . Peripheral leg, 42a .
Wide part, 47b... Narrow part, 5... Plate spring, 6... Packing ring, 7... Screw.

Claims (1)

[Scope of utility model registration request] A reflector holding the bulb is disposed within a lamp chamber defined by a housing with an opening for attaching and detaching the light source bulb at the rear and a lens attached to the front of the housing, and the opening is covered with a waterproof cover. In the vehicle lamp, a pair of hook portions having an L-shaped cross section are formed on the back surface of the housing, the waterproof cover is provided with a plate-shaped spring rotatably pivoted approximately at the center of the outer surface, and the plate-shaped The spring is rotated so that the plate spring engages with the pair of hooks to press the waterproof cover into contact with the housing, and the waterproof cover has a short cylindrical shape with a bottom and no top. In addition, an annular groove is provided on the end face of the cylindrical part, the width of the groove near the opening is widened, and a packing ring is fitted into the widened wide part to make the packing ring waterproof. The outer surface is compressed and interposed between the cover and the housing, and as described above, the opening of the annular groove is closed with a packing ring to form an annular gap near the bottom of the groove, and the gap is communicated with the atmosphere. A communication hole,
An inner communication hole is provided to communicate the void with the lamp chamber, and the inner and outer communication holes are spaced apart in the same direction of the cylindrical portion of the waterproof cover, so that the air inside the lamp chamber can flow through the inner communication hole. A vehicular lamp characterized in that it is configured to communicate with the atmosphere through an outer communication hole through approximately half the circumference of the annular gap.