JPH0314735Y2 - - Google Patents

Description

[Detailed Description of the Invention] The vehicle lamp of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Prior art [Figs. 4 and 5] D. Problems to be solved by the invention [Figs. 4 to 6] E. Means for solving the problems F Embodiments [Figures 1 to 3] G. Effects of the invention (A. Field of industrial application) The present invention relates to a novel vehicular lamp. Specifically, it is an object of the present invention to provide a novel vehicular lamp of a type in which a lamp body and a lens are welded together, which can eliminate deformation and damage during welding.

(B Overview of the invention) The vehicle lamp of this invention has a welded leg that projects forward on a flange provided on the opening edge of the lamp body so as to project outward, and a welded leg that extends rearward on the peripheral edge of the lens. A vehicle lamp is provided with welded welding legs that protrude from the lamp body, and a protrusion that protrudes toward the rear is formed along the outer edge of the rear surface of the flange. The protrusion engages with a recess formed in the receiving jig that is applied to the rear surface and receives pressure, so that the shape of the lamp body is maintained correctly during the welding process, thereby preventing deformation during welding. This is to prevent damage or breakage.

(C. Prior Art) [FIGS. 4 and 5] Some vehicle lamps, for example, automobile signal lights, have a lamp body and a lens that are joined by welding.

FIGS. 4 and 5 show an example a of such a signal light for an automobile.

b is a lamp body made of synthetic resin, the front side of which is open, and a light bulb d supported at the center of the rear part via a detachable socket c.

A flange e projecting outward is integrally formed on the opening edge of the lamp body b, and a welding leg f projecting forward is integrally formed with the flange e.

g is a lens made of synthetic resin, and a welded leg h protruding toward the rear is integrally formed on the peripheral edge of the lens.

Then, the front end of the welding leg f of the lamp body b and the rear end of the welding leg h of the lens g are welded together in a butted state, thereby joining the lamp body and the lens.

(Problems to be solved by the D idea) [Figures 4 to 6] By the way, in the case of the above-mentioned conventional automobile signal light a, it is said that the lamp body and the lens are deformed or damaged when welded together. There's a problem.

If the lamp body b has a deep depth (dimension indicated by i in the figure), especially if the dimension i is 30 mm or more, the side wall portion of the lamp body will inevitably shrink in the direction of the arrow as shown by the broken line due to shrinkage after molding. It transforms into

Therefore, if welding with the lens as is,
The deformation described above may become increasingly severe or even lead to damage.

That is, the state shown by the solid line in FIG. 6A is the normal positional relationship between the lamp body b and the lens g, but due to the above-mentioned deformation, the welding leg f on the lamp body b side is As shown in the figure, it is in a state of falling inward.

Therefore, if welding is carried out with the lamp body b in the state shown by the two-dot chain line in FIG. Since the inner part of the welded leg h of the lens g comes into contact with the inner part of the welded leg h of the lens g, and is pressurized in that state, a force acts on the lamp body b to make it fall further inward, and vice versa. , a force is applied to the welded leg h of the lens g to push it outward. Therefore, the deformation of the lamp body b becomes increasingly large, and in some cases, cracks may occur at the roots of the welded legs f and h.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the vehicle lamp of the present invention has a flange provided with welding legs formed on the opening edge of the lamp body and welded to the lens on the front surface. A protrusion is formed on the rear surface to engage with a recess provided in a receiving jig that is applied to the rear surface during welding.

Therefore, according to the present invention, when pressure is applied from the front of the flange during welding, the pressure causes the protrusion formed along the outer edge of the rear surface of the flange to protrude rearward to the receiving jig. It engages with the recess and its posture is corrected. By this, the posture of the lamp body is maintained correctly during welding, and therefore,
Increased deformation or damage is prevented.

(F Embodiment) [FIGS. 1 to 3] Details of the vehicle lamp of the present invention will be described below according to the illustrated embodiment.

In the figure, numeral 1 is an automobile signal lamp in which the present invention is implemented.

Reference numeral 2 denotes a lamp body made of thermoplastic synthetic resin, which has an oblong rectangular shape when viewed from the front, and is approximately box-shaped with an opening at the front, and a mounting hole 3 formed in the center of the rear. A lamp socket 4 is detachably attached to the lamp socket 4, and a light bulb 5 is detachably attached to the lamp socket 4.

A flange 6 projecting outward is integrally formed on the opening edge of the lamp body 2.

A welding leg 7 is integrally formed so as to protrude forward from the front surface of the flange 6.

A laterally extending portion 6' of the flange 6,
The part along the outer edge of the rear surface of 6′ is long in the lateral direction;
Further, protrusions 8, 8 are formed that protrude toward the rear. In addition, the inner surfaces of these protrusions 8, 8 are inclined surfaces 8a, which are displaced inwardly as they go forward.
8a. Therefore, the protrusions 8, 8 have a wedge-shaped cross-sectional shape whose width becomes narrower toward the rear.

Reference numeral 9 denotes a lens made of transparent thermoplastic synthetic resin, and a welded leg 10 protruding rearward is integrally formed at the peripheral edge of the lens 9.

As a result, the front end of the welding leg 7 provided on the lamp body 2 and the rear end of the welding leg 10 of the lens 9 are welded in abutted state.
The lamp body 2 and lens 9 are combined.

Next, welding of the welding leg 7 of the lamp body 2 and the welding leg 10 of the lens 9 will be explained in some detail.

A receiving jig 11 supports the lamp body 2 during welding, and has a recess 12 for receiving the main part of the lamp body 2 and a supporting surface 13 supporting the rear surface of the flange 6 of the lamp body 2. The receiving surface 13 has a recess 14 for receiving the protrusion 8 on the rear surface of the flange 6.
14 is formed.

Then, the main part of the lamp body 2 is fitted into the recess 12 of the receiving jig 11. In this state, lamp body 2
If the side wall along the longitudinal direction is deformed due to shrinkage after molding, the flange 6 will be lifted off the support surface 13 of the jig 11 as shown in FIG. 3A. .

15 is a hot plate, that is, a heated block. This hot plate 15 is pressed against the front end surface of the welding leg 7 of the flange 6 and pressurized in the direction shown by the solid arrow. Then, the flange 6 and the side wall of the lamp body 2 receive a moving force in the direction indicated by the dotted line arrow due to the pressing force, and as shown in FIG. 3B, the protrusion 8 formed on the rear surface of the flange 6 moves. Supporting surface 13 of receiving jig 11
The protrusion 8 enters the recess 14 formed in the recess 14 , and the inclined surface 8 a of the protrusion 8 comes into contact with the inclined surface 14 a of the recess 14 .
Then, if the pressure is continued, the protrusion 8
The inclined surface 8a of the protrusion 8a crosses the inclined surface 14a of the recess 14, and finally, as shown in FIG. 3C, the protrusion 8 is completely fitted into the recess 14. In this way, the posture of the lamp body 2 is maintained correctly. During this time, the tip of the welding leg 7 is melted and softened by heating and pressure.

On the other hand, a hot plate is also pressed against the rear end of the welding leg 10 of the lens 9 to melt and soften it.
The rear end is brought into contact with the front end of the welding leg 7 of the lamp body 2, and pressure is applied to join the melted and softened parts.

As described above, the lamp body 2 according to the present invention is held in the correct position by press-fitting the hot plate 15 to the welding legs 7. Therefore, when welding the lamp body 2 and the lens 9, The deformation of the welding legs 7, 10, etc. does not increase, and no excessive force is applied to the welding legs 7, 10, etc., so they are not damaged.

(G. Effect of the device) As is clear from the above description, the vehicle lamp of the present invention has a welded leg that projects forward from the flange that projects outward from the opening edge of the lamp body. A vehicular lamp in which a welding leg protruding rearward is welded to the peripheral edge of the lens, and the flange is attached to a holding jig that is applied to the rear surface during welding along the outer edge of the rear surface of the flange. It is characterized by forming a protrusion protruding toward the rear that engages with the recess.

Therefore, according to the present invention, when pressure is applied from the front of the flange during welding, the protrusion formed along the outer edge of the rear surface of the flange that protrudes rearward is caused by the pressure to It engages with the recess and its posture is corrected. This allows the lamp body to maintain its proper posture during welding, thereby preventing increased deformation or damage.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of the implementation of the vehicle lamp of the present invention. Figure 1 is a vertical side view, Figure 2 is a perspective view of the lamp body, and Figure 3 shows a part of the welding process. The enlarged sectional views of the main parts shown in order from A to C, and Figs. 4 and 5 show an example of a conventional vehicle lamp. Fig. 4 is a longitudinal sectional side view, and Fig. 5 is a lamp body. Figure 6 shows the problems with conventional vehicle lamps. Figure A is an enlarged sectional view of the main parts showing the state immediately before welding of the lamp body and lens, and Figure B is an enlarged sectional view of the lamp body and lens. FIG. 3 is an enlarged cross-sectional view of the main part showing a state in which the two parts are welded together. Explanation of symbols, 1... Vehicle lamp, 2... Lamp body, 6... Flange, 7... Welding leg, 8...
Projection, 9... Lens, 10... Welding leg, 11...
Receiving jig, 14... recess.

Claims (1)

[Scope of Claim for Utility Model Registration] Welding legs protruding forward from a flange extending outward from the opening edge of the lamp body and welding legs protruding backward from the peripheral edge of the lens. A vehicle lamp is welded with a rear surface of the flange, and a rearwardly protruding protrusion that engages with a recess provided in a holding jig that is applied to the rear surface during welding is provided along the outer edge of the rear surface of the flange. A vehicle lamp characterized by having a shape.