JP2504564Y2 - Packing for vehicle lighting - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a vehicular lamp, and more particularly, when the vehicular lamp has a shape in which caps are attached to both ends of a pipe-shaped housing, the housing and the cap are provided. It is related to a packing interposed between and for waterproofing.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a waterproof structure in a conventional vehicle lamp 90 of this type. A housing 91 of the vehicle lamp 90 is formed in a pipe shape by extrusion molding or the like and has openings at both ends. 91a, each of the openings 91a has an outer diameter smaller than the inner diameter of the housing 91 and a cap body 92a formed to have an outer diameter substantially equal to the outer diameter of the housing 91. A cap 92 consisting of a leg 92b formed as a diameter
Is to be inserted.

At this time, the seal packing 93 is sandwiched between the abutting surface between the opening 91a and the cap body 92a and the gap between the inner diameter of the housing 91 and the leg 92b for waterproofing. A plurality of waterproof ribs 93a are provided along the circumferential direction on the contact surface of the seal packing 93 with the inner diameter of the housing 91 to reduce the force for inserting the leg portion 92a into the housing 91 and to facilitate the work. The waterproof rib 93a is easily compressed to enhance the waterproof function.

[0004]

However, in the conventional structure described above, all the waterproof ribs 93a are formed to have the same rib width, so that the housing 9
If the rib width is set to be narrow in order to reduce the force required for the work at the time of attaching the cap 92 to 1, the workability is certainly improved, but the deformation due to external stress or the like easily causes water intrusion, and If the rib width is set thicker to improve the waterproof performance, it becomes difficult to insert the cap 92 into the housing 91 and the workability is significantly reduced.

Further, the above-mentioned contradictory characteristics are caused by the housing 9
The optimum value varies depending on the sectional shape of 1. Therefore, the optimum value obtained with one type of vehicular lamp is not necessarily the optimum value of the other type, and for these reasons workability and waterproof performance are There has been a problem that it is very difficult to set a compatible rib width, and it has been a problem to solve this problem.

[0006]

As a concrete means for solving the above-mentioned conventional problems, the present invention relates to a vehicle lamp assembling by inserting a leg portion of a cap into a pipe-shaped housing. In a packing interposed between the housing and the leg portion for waterproofing, a waterproof rib provided circumferentially on a contact surface of the packing with the inner surface of the housing has a tip end in the insertion direction of the leg portion into the housing. The problem is solved by providing a packing for a vehicular lamp, wherein the rib width is sequentially increased from the side to the terminal side.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 denotes a vehicular lamp. The vehicular lamp 1 has a pipe-shaped housing 2 formed by, for example, extrusion molding of a resin, and openings 2a at both ends of the housing 2 are provided. The leg portion 3a of the cap 3 is inserted with the packing 4 interposed, and the housing 2 and the leg portion 3a compress the plurality of, for example, three waterproof ribs 41, 42, 43 provided in the packing 4. It is similar to the conventional example in that it is waterproof.

Here, in the present invention, the waterproof rib 4 is used.
The rib widths D1 to D3 are different from each other. At this time, the waterproof rib 41, which is the tip side when the leg portion 3a is inserted into the housing 2, is set to have the narrowest rib width D1. Hereinafter, the rib widths D2 and D3 are made wider toward the terminal end side of the insertion in order.

With the above construction, the packing 4 of the present invention has the narrowest rib width D1 of the waterproof rib 41 when the housing 2 and the cap 3 are assembled.
From the above, it is inserted into the housing 2, and at first, the insertion work can be smoothly performed without requiring much force.

Next, the waterproof rib 42 having the rib width D2 is to be inserted, which requires a little large force. At this time, the previously inserted waterproof rib 41 serves as a guide and the mutual position between the housing 2 and the cap 3. Since it is held correctly, the insertion can be smoothly continued by increasing the pressing force without getting caught.

Finally, the waterproof rib 43 having the widest rib width D3 is to be inserted, which requires a larger force, but at this time, the remaining insertion amount is small, and as described above. Since the waterproof ribs 41, 42 are guided by the waterproof ribs 41, 42, the insertion is smooth without being caught, and the work is not so difficult to continue.

After the insertion is performed to the fixed position as described above, the waterproof rib 43 having the widest rib width D3 and having a high waterproof function is located near the connecting portion between the housing 2 and the cap 3. , Will have a sufficient waterproof effect. Further, even if water is generated at the waterproof ribs 43, the amount thereof becomes small, so that the waterproof ribs 42 or 41 having the narrower rib widths D2 and D1 should be used to prevent the water. Is sufficiently possible, and therefore, the overall waterproof function is not inferior even if all the ribs have a wide width.

Further, with the above configuration, for example, the influence of the cross-sectional shape of the housing 2 is less likely to occur and, for example, it can be similarly set in another model of the vehicular lamp having a different cross-sectional shape. It is also possible to reduce the labor at the time of designing, for example, by repeating the design and experiment by obtaining the optimum value of the rib width for each cross sectional shape.

[0014]

As described above, according to the present invention, the waterproof ribs provided along the circumferential direction on the contact surface of the packing with the inner surface of the housing are provided from the front end side to the terminal end side in the insertion direction of the leg portion into the housing. By using the packing for the vehicle lamp whose rib width is gradually increased, firstly, the housing and the cap in the assembly process of the vehicle lamp are not deteriorated as in the conventional example without lowering the waterproof performance. The force required for the mounting work is reduced to improve the workability, and thus, the productivity is improved extremely effectively.

Secondly, with the above construction, the waterproof performance is less affected by the cross-sectional shape of the housing, etc., and conventionally, the rib width is extremely critical in consideration of workability. This also has the effect of expanding the allowable range and facilitating the design of this type of packing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a packing for a vehicular lamp according to the present invention.

FIG. 2 is a cross-sectional view showing a conventional example.

[Description of symbols] 1 ... Vehicle lamp 2 ... Housing 2a ... Opening 3 ... Cap 3a ... Leg 4 ... Packing 41, 42, 43 ... Waterproof rib D1, D2, D3 .. Rib width

Claims (1)

(57) [Scope of utility model registration request] 1. A packing which is interposed for waterproofing between the housing and the leg of a vehicular lamp which is assembled by inserting a leg of a cap into a pipe-shaped housing. An inner surface of the housing of the packing. For a vehicle, a waterproof rib provided along the circumferential direction on the abutment surface of the vehicle is such that the rib width gradually increases from the front end side to the end side in the insertion direction of the leg into the housing. Packing for lighting equipment.