JP2009002365A - Waterproof screw stopping structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage or undesirable deformation of a rubber washer in fastening, to prevent deterioration of the rubber washer, and also to prevent deterioration of waterproof performance of a chassis fastening part, with the lapse of time. <P>SOLUTION: In waterproof screw stopping structure, a waterproof washer 6 is interposed between a bolt head and a fastening part 5. The waterproof washer is constituted of the rubber washer 8 closely brought into contact with the fastening part and a washer 7 integrated with the rubber washer, and a sub washer 9 is interposed between the washer and the bolt head part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a waterproof screw-fastening structure in an electronic device that is installed outdoors or used outdoors and requires a waterproof function.

  Electronic equipment installed outdoors or used outdoors is required to have a waterproof function, and a screw stop portion for fastening the chassis has a waterproof structure.

  A conventional waterproof screw fastening structure will be described with reference to FIGS.

  FIG. 5 shows a chassis 1 of a communication device. In the drawing, the chassis 1 has a halved structure, and a chassis cover 3 is fastened to the chassis base 2 by bolts 4. In FIGS. 5 and 6, reference numeral 5 denotes a fastening portion formed on a flat surface for bolt fastening.

  Further, a waterproof washer 6 is used to make the fastening portion 5 waterproof. The waterproof washer 6 is formed by integrating a metal flat washer 7 and a washer 8 (hereinafter referred to as a rubber washer) 8 made of an elastic material such as rubber. By fastening with the bolt 4 through the rubber washer 8, the rubber washer 8 is compressed and deformed and is brought into close contact with the fastening portion 5, and the fitting portion of the bolt 4 is sealed. A seal ring (not shown) is provided at the joint between the chassis base 2 and the chassis cover 3, and the joint between the chassis base 2 and the chassis cover 3 is watertight.

  In the conventional waterproof screw-fastening structure, the rubber washer 8 is compressed and deformed by the screwing of the bolt 4, and the rubber washer 8 is compressed and brought into close contact with the fastening portion 5. A large frictional force is generated between the rubber washer 8. Further, since the head of the bolt 4 is rotated while being pressed by the flat washer 7, a large rotational force acts on the flat washer 7, and the rubber washer 8 is twisted and deformed.

  When the rotational force from the bolt 4 is greater than the frictional force between the fastening part 5 and the rubber washer 8, the rubber washer 8 rotates while rubbing against the fastening part 5 and generates damage due to friction. There is a fear. When the frictional force between the fastening portion 5 and the rubber washer 8 is larger than the rotational force from the bolt 4, the rubber washer 8 is twisted. In either case, the waterproof function may be deteriorated due to deterioration over time.

JP-A-8-200345

  In view of such circumstances, the present invention prevents the rubber washer from being damaged or undesirably deformed at the time of fastening, prevents the rubber washer from being deteriorated, and prevents the waterproof performance of the chassis fastening portion from being deteriorated over time. is there.

  The present invention is a waterproof screw-fastening structure in which a waterproof washer is interposed between a bolt head and a fastening portion, and the waterproof washer is composed of a rubber washer that is in close contact with the fastening portion and a washer integrated with the rubber washer. Thus, the present invention relates to a waterproof screw fastening structure in which a sub washer is interposed between the washer and the bolt head.

  According to the present invention, a waterproof screw-fastening structure in which a waterproof washer is interposed between a bolt head and a fastening portion, and the waterproof washer is integrated with the rubber washer that is in close contact with the fastening portion. Since a sub washer is interposed between the washer and the bolt head, slipping occurs between the washer and the sub washer and between the sub washer and the bolt head, and the bolt is The rotational force applied to the rubber washer is reduced, and the rubber washer is prevented from being damaged and deteriorated over time.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a view corresponding to an arrow AA in FIG. 6. In FIG. 1, the same components as those shown in FIG. 6 are denoted by the same reference numerals. Further, the structure of the chassis 1 is the same as that shown in FIG.

  In the present invention, when fastening with the bolt 4, the waterproof washer 6 is provided so as to contact the fastening portion 5, the sub washer 9 is stacked on the waterproof washer 6, and the bolt 4 is connected to the sub washer 9 and the waterproof washer 6. And is fastened to the chassis base 2.

  As the material of the sub-washer 9, a metal material such as steel or stainless steel, or a synthetic resin material having a low frictional resistance is used.

  The sub washer 9 is interposed between the head of the bolt 4 so that when the bolt 4 is excessively tightened, the sub washer 9 slips between the flat washer 7 and the sub washer 9, and the sub washer 9 and the bolt 4 This causes slippage between the rubber washer 8, reduces transmission of rotational force to the rubber washer 8, and reduces torsional deformation of the rubber washer 8.

  By reducing torsional deformation, it is possible to prevent damage to the rubber washer 8 and deterioration over time.

  FIG. 2 shows a second embodiment of the present invention. In the second embodiment, the rotation of the waterproof washer 12 is restricted by the engagement of the waterproof washer 12 and the chassis cover 3, and the rubber This prevents the washer 13 from being twisted. In FIG. 2, the same components as those shown in FIG. 6 are denoted by the same reference numerals.

  The chassis cover 3 is provided with a fastening portion 5 for fastening a bolt, and a terminal portion (hereinafter referred to as a bolt engagement) of a polygon (hexagonal in the drawing) around the bolt insertion hole is formed at the end portion of the fastening portion 5. Part 11) is formed.

  The waterproof washer 12 has a hexagonal shape, and both the rubber washer 13 and the flat washer 14 have a hexagonal shape, and both are integrated. The hexagonal shape of the waterproof washer 12 is slightly smaller than the hexagonal shape of the fastening portion 5, and the waterproof washer 12 can be inserted into the fastening portion 5.

  By inserting the waterproof washer 12 between the fastening portion 5 and the head of the bolt 4 and fastening with the bolt 4, the bolt fitting portion can be sealed. In addition, a rotational force from the bolt 4 acts on the waterproof washer 12 when the bolt 4 is tightened, but the waterproof washer 12 is engaged with the bolt engaging portion 11 to restrict rotation. Accordingly, only the compression force acts on the rubber washer 13, and no unnecessary twist is generated.

  The fastening portion 5 may be a hexagonal recess similar to the waterproof washer 12. Further, if the flat washer 14 of the waterproof washer 12 has a rectangular shape and the width dimension of the flat washer 14 and the width dimension of the fastening part 5 are the same, the terminal part of the fastening part 5 does not have a polygonal shape. May be. In short, it is sufficient that the flat washer 14 is engaged with the fastening portion 5 and has a shape in which rotation is restricted.

  3 and 4 show a third embodiment. In FIGS. 3 and 4, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  In the third embodiment, the waterproof washer 12 is interposed and fastened by the bolt 4.

  The waterproof washer 12 is formed by polymerizing a flat washer 7 and a rubber washer 8, and integrating the two. Four protrusions 15 are provided on the upper surface of the flat washer 7 at a required number, that is, in the figure, divided into four equal parts. The shape of the protrusion 15 is a semi-spherical shape or a shape similar to a spherical shape, and makes contact with the head of the bolt 4 to cause smooth slip. Further, the material of the flat washer 7 may be a synthetic resin having a small coefficient of friction with the head of the bolt 4, or may be subjected to a surface treatment with a metal to reduce the frictional resistance. .

  By forming the projection 15, the slip between the flat washer 7 and the head of the bolt 4 is improved, the rotational force transmitted to the rubber washer 8 is reduced, and the rubber washer 8 is torsionally deformed. Decrease.

  By reducing torsional deformation, it is possible to prevent damage to the rubber washer 8 and deterioration over time.

It is a principal part side view which shows the 1st Embodiment of this invention. It is a perspective view which shows the 2nd Embodiment of this invention. It is a perspective view which shows the 3rd Embodiment of this invention. It is principal part sectional drawing of this 3rd Embodiment. It is a perspective view which shows an example of the chassis of a communication apparatus. It is a perspective view which shows the conventional waterproof screw stop structure. It is a principal part side view of the conventional waterproof screw stop structure.

Explanation of symbols

3 Chassis cover 4 Bolt 5 Fastening portion 9 Sub washer 11 Bolt engaging portion 12 Waterproof washer 13 Rubber washer 14 Flat washer 15 Protrusion

Claims (1)

  A waterproof screw-fastening structure in which a waterproof washer is interposed between a bolt head and a fastening portion, the waterproof washer comprising a rubber washer that is in close contact with the fastening portion and a washer integrated with the rubber washer, and the washer A waterproof screw-fastening structure, wherein a sub washer is interposed between the bolt head and the bolt head.

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