JPH0511665Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a structure for connecting and taking out a lead wire from a case of, for example, an electronic device for an automobile.

BACKGROUND ART In a typical prior art, as shown in FIG. 5, a notch 2 is formed in a case 1 of an electronic device, and a base made of an elastic material such as rubber is formed in the notch 2. It has a structure in which the grooves 4 of No. 3 are fitted. A lead wire 5 is inserted through the base body 3.

FIG. 6 is a front view showing a state in which the base body 3 is fitted into the notch 2. In the prior art, the recesses 2 are parallel, so that the base body 3 is referred to as reference numeral 6.
When pressed in the direction shown by arrow 7, a large force acts near the front portion 3a of the base 3, and the force is difficult to transmit near the side portion 3b. Therefore, a gap is created between the base body 3 and the notch 2 near the side thereof, resulting in insufficient waterproofing.

Therefore, it is conceivable to increase the pressing force that presses the base body in the direction of reference mark 6 to increase the force at the side part 3b, but in that case, the force at the front part 3a becomes excessive and water intrusion occurs due to deformation of the base part. There is a risk.

Problems to be Solved by the Invention The purpose of the invention is to provide a lead wire outlet structure that ensures airtightness.

Means for Solving the Problems The present invention provides a lead wire outlet structure in a case for storing electronic equipment, which includes a wedge-shaped notch formed in the case that becomes wider toward the open end, and a periphery. The case is made of an elastic material, and has a concave groove having a shape corresponding to the notch at the end thereof, and a cylindrical portion having an insertion hole through which the lead wire is inserted, and protrudes outward from the case. A lead wire outlet structure comprising: a base body, and the base body is pressed and held toward the notch side with the groove fitted into the notch.

Function The notch formed in the case has a wedge shape that widens toward the open end, and therefore the variation in the pressing force exerted by the groove of the base toward the notch is reduced. Therefore, even if the pressing force is not so strong as to cause deformation of the base, the base is sufficiently pressed against the notch and tightly adheres to it. This improves airtightness and ensures reliable waterproofing.

Further, the lead wire is inserted through an insertion hole provided in a cylindrical portion of the base body that protrudes toward the outside of the case. The base body is made of an elastic material such as rubber, and can therefore absorb vibrations applied to the lead wire from outside the case. Furthermore, the cylindrical portion is displaced to follow the displacement of the lead wire due to a tensile force applied to the lead wire in a direction crossing the axial direction of the cylindrical portion. As a result, the tensile force does not act locally on the base, the airtightness between the base and the notch is further improved, and the waterproof effect can be further enhanced.

Embodiment FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. A notch 12 is formed in the side wall of the case 11 of the automotive electronic device. A case 13, which acts as another lid, is fitted into the case 11 so as to partially surround it. In this way, the electronic devices are housed in the cases 11 and 13. Inside the case 11, there is a raised mounting part 1.
4 is formed. By inserting the screw 16 into the mounting hole 15 of the case 13 and screwing it into the mounting piece 14, the cases 11 and 13 are fixed integrally. The notch 12 has wedge-shaped support surfaces 12a and 12b that become wider toward the open end, and an arc-shaped support surface 1 that connects these support surfaces 12a and 12b.
It consists of 2c. The base body 18 made of an elastic material such as rubber has a shape corresponding to the shape of the notch 12. A groove 19 formed on the peripheral edge of the base body 18 can be tightly fitted into the notch 12 . This groove 19 has support surfaces 12a, 12b, 1
2c, contact surfaces 19a, 19b,
It has 19c. A cylindrical portion 20 extending outward from the case 13 is integrally formed on the base body 18 . A lead wire 21 coated with a flexible synthetic resin coating layer is inserted into the insertion hole 22 of the cylindrical portion 20 . Cylinder part 2
Silicone oil or the like is applied between the inner peripheral surface of the insertion hole 22 through which the lead wire 21 of No. 0 is inserted and the outer peripheral surface of the lead wire 21 to achieve airtightness.

The case 13 is formed with a bulge 23 that partially surrounds the base 18 in a state where the base 18 is fitted into the notch 12 . This bulging portion 23 includes rising portions 25 and 26 that are connected to the wall portion 24 of the case 13.
and a connecting portion 27 that continues to these rising portions 25 and 26, and a notch 28 that partially surrounds the cylinder body 20 is formed at the side end of the connecting portion 27.

Fig. 3 is a cross-sectional view taken along the line - of Fig. 1, and Fig. 4 is a cross-sectional view taken along the line - of Fig. 1. A thin coating layer 29 made of an elastic material such as rubber is formed on the inner surface of the case 13, thereby improving the airtightness of the cases 11 and 13 as well as the base body 18 and the case 13.

By tightening the cases 11, 13 using the screws 16, a force indicated by reference numeral 30 in FIG. 1 is applied to the base body 18. The notch 12 is a wedge surface, and the contact surfaces 19a, 19b, 19c of the groove 19 fitted into the notch 12 are attached to the support surfaces 12a, 12b, 12c of the notch 12 by reference numeral 3 in FIG.
As shown by 1, the contact is made with almost uniform force. In this way, the airtightness between the notch 12 and the base body 18 is improved, and waterproof performance is exhibited.

According to the present invention, the cylindrical body 20 does not need to be formed on the base body 18.

Effects As described above, according to the present invention, since the concave groove of the base body contacts the notch through a wedge action, airtightness is reliably achieved over the entire circumferential surface of the notch, and waterproof performance is improved. It turns out.

Further, the lead wire is held by a cylindrical portion made of an elastic material that can follow the displacement of the lead wire, so that even if a tensile force is applied to the lead wire, Without the tensile force acting locally on the base, the airtightness between the base and the notch can be further improved, and the waterproof function can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is an exploded perspective view of the embodiment, Fig. 3 is a sectional view taken along the cutting plane line - of Fig. 1, and Fig. 4 is a 5 is an exploded perspective view of the prior art, and FIG. 6 is a front view of the prior art shown in FIG. 5. 11, 13...Case, 12...Notch, 18
... Base body, 19 ... Concave groove, 20 ... Cylindrical body, 21 ...
...Lead wire, 23...rod protrusion.

Claims (1)

[Claims for Utility Model Registration] A lead wire outlet structure in a case for storing electronic equipment, which comprises: a wedge-shaped notch formed in the case that becomes wider toward the open end; A base body made of an elastic material has a cylindrical part formed with a concave groove having a shape corresponding to the notch and an insertion hole through which a lead wire is inserted, protruding outward from the case. The lead wire outlet structure is characterized in that the base body is pressed and held toward the notch side in a state where the groove is fitted into the notch.