JP3739984B2 - Cable seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable sealing structure such as a communication cable, an optical cable used in a housing for storing electronic / electrical equipment, and an electric cable.
[0002]
[Prior art and problems]
2. Description of the Related Art Conventionally, as a cable sealing structure used for a communication cable and a housing for housing equipment, the following structure is known.
For example, in Japanese Patent Application Laid-Open No. 10-224960 (A), as shown in FIG. 5, a wire harness 31 is passed through a hook-shaped grommet 32 that is locked to a casing 33, and a water stop agent 34 is placed in the grommet 32. An injection and sealing structure is shown.
Japanese Patent Application Laid-Open No. 11-187546 (B) shows a structure in which the packing 35 penetrating the harness 31 ′ is compressed by the pressing plate 37 and sealed as shown in FIG.
[0003]
In the case of the technique (A), it is necessary to provide a through hole 38 for allowing the wire harness 31 to pass through the grommet 32 as a seal member. Further, if a slit is made in the grommet 32, the sealing performance between the housing / grommet and between the cable / grommet is inferior. Therefore, it is necessary to make a precisely adjusted through hole.
Furthermore, when there are large members such as connectors to be connected / introduced at the tip of the wire harness 31, the through holes and the seal member are also large.
(B) In the case of the technique, it is a packing compression type, and in that case, in order to seal the harness 31 ′, it is necessary to compress the packing 35 in the wire passing direction and to bring out the compression portion 39 in the radial direction of the harness 31 ′. There is. Furthermore, a screw part or a bolt 36 for compressing the packing 35 is required, and the structure of the housing is complicated.
Further, in order to compress the packing 35 evenly, a plurality of screw portions or bolts 36, 36 'are required. This is because the screw (bolt) is tightened and compressed around the position of the cable to be sealed.
[0004]
[Means for Solving the Problems]
As a result of various studies on the above problems, the present inventor has found that a cylindrical elastic grommet having a through hole with a slit through which a cable passes, and U-shaped cuts on the outer periphery of the elastic grommet above and below or on the front and back. Cable-seal structure that consists of a pair of disk-shaped holding metal fittings held in a pair , and is fitted with screws and female screws or tapping screws to compress and fix the elastic grommet and holding metal fittings As a result, it has been found that a tight cable seal can be established along with downsizing of parts, reduction in the number of parts, reduction in assembly process, etc., and the present invention has been completed.
That is, the present invention provides:
(1) with the sealing structure of the cable constructed and the elastic body and the retainer member from the structure of a set of cylindrical shape respectively two at a time, the through-hole with a slit elastic body through the cable to the periphery and an elastic body having a cylindrical shape, presser bracket a retainer member of the circle plate shape having on its periphery a notch of the U-shaped through a cable, cut through holes and the U-shaped with the slit DOO are compatible with each other to pass the cable, yet has a threaded through-hole in the s central husband and elastic body and retainer member, and the elastic body and retainer member is a fittable by a screw or a tapping screw The cable seal structure is characterized in that both are compression-fixed .
(2) the elastic body is characterized in that it is an elastic body having a penetration from 20 to 100.
(3) Another feature is that the periphery of the through-hole of the elastic body through which the cable passes is on a business trip so as to cover the outer periphery of the passed cable.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(I) As shown in FIG. 1, the sealing structure of the cable of the present invention basically includes a resilient member grommet 3 of cylindrical shape with a cable through hole 5 with a slit 6 at its periphery, the cable passage hole The disk- shaped presser brackets A, B7, and 8 each having a U -shaped notch 12 for passing the same number of cables as the number 5 on the outer periphery of the presser bracket are a set of cylindrical structures. It is composed from the body, and a cable through hole 5 and the U-shaped notch 12 with the slit 6 correspond to each other to pass the cable, yet elastic body grommet 3 and the holding metal fitting a, central B7,8 has a respective threaded transmural throughbore 11, pressing even may make myself lifting the female screw 10 in bracket A7, both fitting a, B7,8 is an engageable by a screw 9 or tapping screw, both
A cable seal structure to be compressed and fixed (claim 1).
[0006]
That, (i) sandwiching an elastic body grommet 3 of cylindrical shape and the holding bracket A7 and retainer member B8, through a screw transmural throughbore 11 of bracket B8 holding the screw 9, further nut function provided in retainer member A7 The presser fittings A, B7, 8 are fitted to each other and the female screw 10 and the grommet 3 sandwiched between them is compressed and fixed in the axial direction.
Since the expansion of the elastic grommet 3 in the radial direction is limited by the disk-shaped presser fittings 7 and 8, the grommet 3 is also compressed in the radial direction, the cable through hole 5 is in close contact with the cable 2, and the slit 6 is hermetically sealed. The cable 2 is sealed.
As shown in FIG. 1 or 2, the elastic grommet 3 has a cylindrical shape having a small diameter portion (step groove 17) at the center. In this case, according to FIG. 2, when fitting the elastic body grommet 3 to the housing through-holes 4, the relationship of D> d between the diameter d of the diameter D and the elastic body grommet 3 of the housing through hole 4 When the elastic grommet 3 is inserted into the housing through hole 4 and compressed, d and a become large and can be sufficiently sealed.
[0007]
(Ii) Further, in order to insert the cable 2 from the radial direction, a slit 6 is provided around the elastic grommet 3, and U -shaped cuts 12 are provided in the holding metal fittings A, B7, 8 as sandwiching members. Yes.
Therefore, there is an advantage that the elastic grommet 3 and the presser fittings A, B7, and 8 which are seal members can be easily inserted vertically by the slit 6 without penetrating the cable 2.
(Iii) In the cable seal structure of the present invention, the housing 1 may be simply provided with the housing through hole 4 at the center, so that the housing structure can be simplified and the cost can be reduced.
Further, when the cable 2 is passed through the housing through hole 4, the cable can be sealed with the cable seal structure of the present invention.
(Iv) Since the cable 2 is arranged evenly around the screw 9, the elastic grommet 3 can be evenly compressed even with one screw, so the number of screws 9 can be reduced, the parts cost can be reduced, the parts can be downsized, Reduces assembly man-hours.
[0008]
(2) as an elastic body grommet material of the present invention, since an elastic body penetration 20 to 100, followability to the sealing surface well to improve waterproof, easily opens the slit 6 of the cylindrical elastic bodies, Good workability.
(3) Since the periphery of the cable passage hole 5 of the grommet 3 is traveling in a mouth shape so as to cover the outer periphery of the passed cable , for example, as shown in FIG. Wiring is possible without abrupt bending of the cable 2 immediately after. In addition, the cable can be protected from the edge of the pressing metal that is the sandwiching member.
[0009]
The material of the elastic body constituting the grommet, penetration can be cited vulcanized rubber or elastomer 20-100.
The penetration is a “consistency” indicated by JIS K2220 or ISO2137.
The “consistency” is a numerical value representing the depth at which the specified cone enters the sample at a specified time by 10 times mm, and is a scale indicating the hardness of the material.
Examples of the material of the pressing metal include metals such as aluminum die casting and stainless steel, and plastics such as polycarbonate, ABS resin, rubber-reinforced polystyrene, and polypropylene.
Although it does not specifically limit as a housing used for this invention, For example, as FIG. 3 shows, the inside of a housing is divided by the partition 13 into the accommodating part 14 of a water immersion / ventilation free structure, and the accommodating part 15 of a waterproof structure. Is preferred.
When the cable 2 is passed through the housing through-hole 4 of the partition wall 13 of the housing 1, if the cable seal structure of the present invention is applied, water can enter the housing portion 15 of the waterproof structure from the housing portion 14 of the free water / ventilation structure. Can be prevented.
[0010]
<Work procedure>
(I) The slit 6 of the elastic grommet 3 is expanded, and the cable 2 is inserted into the slit 6 from the radial direction of the grommet and pushed into the cable passage hole 5.
(Ii) The elastic grommet 3 through which the cable 2 is passed is inserted into the housing through hole 4, and the narrow diameter portion (step groove) 17 of the grommet 3 is set to the position of the housing 1 wall as shown in FIG.
(Iii) While passing the cable 2 through the notches 12 of the presser fittings A, B7, 8, the elastic grommet 3 is sandwiched and the screw 9 is tightened to form a cable seal structure.
[0011]
【The invention's effect】
According to the present invention, the elastic body grommet cylindrical shape having a slit cable through holes, sandwiched between two retainer member of disk shape, presser fitting the bracket with the screw and the female screw or tapping screw engaged with the elastic body grommet Since the cable seal structure that compresses and fixes is used, there is an effect that a tight cable seal can be established along with downsizing of parts, a reduction in the number of parts, a reduction in assembly processes, and the like.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a cable seal structure of the present invention. Figure 1 (b) is a perspective view thereof, FIG. 1 (b) is a expansion large drawing and surrounding the cable through hole.
FIG. 2 is a state diagram for explaining a mechanism for compressing and fixing an elastic grommet in a through hole of a housing.
FIG. 3 is a schematic view showing one embodiment of the housing of the present invention.
FIG. 4 is a schematic diagram illustrating a cable seal structure of the present invention. FIG. 4- (a) is a front view thereof, and FIG. 4- (b) is an arrow view showing an AA cross section of FIG. 4- (a).
In FIG. 4- (a), eight cable through holes 5 are shown, but the shape and number of the cable through holes 5 may be appropriately determined according to the shape and number of the cables 2 that pass through the housing through holes 4. .
FIG. 5 is a schematic view showing a conventional cable seal structure.
FIG. 6 is a schematic view showing another conventional cable seal structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Cable 3 Elastic body grommet 4 Housing through-hole 5 Cable through- hole 6 Slit 7 Holding metal A
8 Presser bracket B
9 screw 10 female screw 11 screw transmural throughbore 12 cuts 13 partition wall 14 flooding ventilation housing portion 16 thin portion 17 of the housing portion 15 waterproof structure for the free structure step groove 31 wiring harness 31 'harness 32 grommet 33 housing 34 waterproof agent 35 Packing 37 Presser plate

Claims (3)

In the sealing structure of the cable constructed and the elastic body and the retainer member from the structure of a set of cylindrical shape respectively two at a time, cylindrical elastic body is brought to the periphery of the through hole with a slit through which the cable of an elastic member, a retainer member of the circle plate shape presser bracket had on its outer periphery a notch of the U-shaped through a cable, through holes with the slit and the U-shaped notch and the cable the correspond with each other to pass, yet has a threaded through-hole in the s central husband and elastic body and retainer member, a matable with elastic body and retainer member is a screw or a tapping screw, both A cable seal structure characterized by being compressed and fixed . The elastic body, the cable seal structure according to claim 1, characterized in that an elastic body having a penetration from 20 to 100. The cable seal structure according to claim 1, wherein the circumference of the through hole of the elastic body through which the cable passes is made a business trip so as to cover the outer periphery of the passed cable.

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