JPH0539213Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a waterproof structure for a ball joint used in an automobile wiper device, etc.

[Prior art and problems to be solved by the invention] Generally, when forming a ball joint (spherical joint) in a link, the ball joints must be formed close to each other so as to protrude from the front and back surfaces of the link. There are cases.

In such a case, it is sufficient to bring the spindles with ball parts formed at their tips close to each other, but when at least one ball joint is made to have a waterproof structure, conventionally, the opening edge of the waterproof body placed over the joint outer is It was closed by bringing it into contact with the link surface.
On the other hand, the support shaft is designed to be integrally fixed to the link by fitting the base end penetrating through the link, so if the ball part is made to protrude from the front and back surfaces, The end will interfere with the opening edge of the waterproof body, and as a result, it is necessary to separate the supporting shafts to a position where the base end and the waterproof body opening edge do not interfere, and it is true that they cannot be brought closer than this. It was impossible.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a waterproof structure for a ball joint that can eliminate these drawbacks. A ball joint in which a support shaft is integrally attached to a link such that a ball portion formed at a tip projects from the front and back surfaces of the link, and a joint outer is fitted onto each ball portion so as to be able to freely slide on a spherical surface, wherein the joint outer Assuming that at least one of them is covered with a waterproof material,
The support shaft on one side to which the waterproof body is attached is shaped like an elongate to separate the ball part from the link, and the base end of the support shaft is in contact with the link surface, and the opening edge of the waterproof body is attached to the tip. A cylindrical body provided with a brim-like abutment member is inserted through the waterproof body, and the opening edge of the waterproof body is brought into contact with the abutment member at a position raised from the link surface to close it. Assuming that the base end of the support shaft on the other side that penetrates the link enters the gap formed between the contact member and the link surface, the support shaft on the other side is connected to the support shaft on the one side by a waterproof body. It is characterized by a structure that allows it to be assembled by overlapping the two.

With this configuration, the present invention allows the base end of the other side support shaft to be formed so as to overlap the opening edge of the waterproof body.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a link used in a wiper device of an automobile, and the base end portions 4a and 5a of support shafts 4 and 5 constituting ball joints 2 and 3 are attached to the tip of the link 1, respectively. The support shafts 4 and 5 are
are provided so that ball portions 4b and 5b formed at their tips protrude from the front and back surfaces of the link 1, respectively. Further, the ball portion 4b of one of the support shafts 4 and 5 is connected to the link 1.
A cylindrical spacer 6 whose proximal end is in contact with the surface of the link 1 is inserted into the elongate portion 4c, and the distal end of the spacer 6 A disc-shaped washer 7 is provided. On the other hand, reference numeral 8 denotes a joint outer that is spherically slidably fitted to the ball portion 4b of the support shaft 4 on one side (a joint outer that is spherically and slidably fitted to the ball portion 5b of the other side support shaft 5). (not shown), the outer periphery of the joint outer 8 is covered with a waterproof cover 9 made of a rubbery elastic material. This waterproof cover 9 has link 1
The opening edge of the hem portion 9b that extends outward toward the side is pressed against the washer 7, thereby closing the opening edge of the waterproof cover 9 at a position floating above the surface of the link 1. The structure is such that it can be done. The base end 5b of the support shaft 5 on the other side is located in the gap formed between the washer 7 and the surface of the link 1, thereby allowing the support shaft 5 on the other side to The waterproof cover 9 can be provided close to the shaft 4 in an overlapping state.

In the embodiment of the present invention constructed as described above, the ball joints 2 and 3 are provided such that the ball portions 4b and 5b at the tips of the support shafts 4 and 5 project from the front and back surfaces of the link 1, respectively. However, even if at least one of these ball joints 2 is covered with a waterproof cover 9 to have a waterproof structure, it is necessary to assemble the spindles 4 and 5 to the link 1 as close as possible to each other. Can be done.

That is, in the ball joint 2 on one side where the waterproof cover 9 is provided, the opening edge of the waterproof cover 9 is not in contact with the link 1 surface, but is raised from the link 1 surface by the spacer 6. It comes into contact with the washer 7 located at and is closed. Therefore, the support shaft base end 5a on the other side is inserted into the gap formed between the washer 7 and the link 1 surface.
This allows the support shaft 5 on the other side to be assembled to the support shaft 4 on the one side by overlapping the waterproof cover 9, and the base end of the support shaft on the other side and the waterproof cover can be assembled as in the conventional case. The support shafts 4 and 5 can be assembled to the link 1 in close proximity to each other without interfering with the opening edges. Furthermore, it is no longer necessary to secure a space for the waterproof cover 9 to come into contact with the tip of the link 1, and as a result, it can greatly contribute to making the ball joint more compact, and it can be used like a wiper device in an automobile. Extremely convenient when installed in a narrow space.

It should be noted that the present invention is of course not limited to the above-mentioned embodiment, and as shown in FIG.
a is integrally formed, and the flanged spacer 10 is attached to the support shaft 4.
It may be made to penetrate through.

[Operations and Effects] In summary, the present invention is constructed as described above, and therefore, at least one of Even if the ball joint on one side is covered with a waterproof body to make it waterproof, the opening edge of the waterproof body will be closed by contacting the abutting member at a position raised from the link surface. Therefore, the base end of the other side of the support shaft is inserted into the gap formed between the contact member and the link surface, and the other side of the support shaft is made waterproof with respect to the one side of the support shaft. Can be assembled by overlapping. As a result, the base end of the other side of the support shaft and the opening edge of the waterproof body do not interfere with each other as in the past, and the support shafts can be brought as close to each other as possible, and the ball joint part This greatly contributes to compactness, and is extremely convenient when installed in a narrow space, such as in an automobile wiper device.

[Brief explanation of the drawing]

The drawings show an embodiment of the waterproof structure of the ball joint according to the present invention, in which Fig. 1 is a side view of the ball joint part, and Fig. 2 is a side view of the ball joint part showing another example. 3 are side views of a ball joint portion showing a conventional example. In the figure, 1 is a link, 2 and 3 are ball joints, 4 and 5 are support shafts, 4a and 5a are base ends, 4b,
5b is a ball part, 4c is a head part, 6 is a spacer,
7 is a washer, 8 is a joint outer, and 9 is a waterproof cover.

Claims (1)

[Scope of utility model registration request] In a ball joint in which the spindle is integrally attached to the link so that the ball portion formed at the tip of the spindle protrudes from the front and back surfaces of the link, and a joint outer is fitted onto each ball portion so as to be able to slide freely on a spherical surface, Assuming that at least one of the joint outer parts is covered with a waterproof body, the support shaft on one side to which the waterproof body is attached is made into a long shape to separate the ball part from the link, and the main shaft is , the opening edge of the waterproof body is removed from the link surface by inserting a cylindrical body whose base end is in contact with the link surface and whose tip is provided with a brim-like abutment member against which the opening edge of the waterproof body is in contact. Close it by contacting the abutment member at the raised position, and the proximal end of the support shaft on the other side passing through the link enters the gap formed between the abutment member and the link surface. A waterproof structure for a ball joint, characterized in that the support shaft on the other side can be assembled to the support shaft on one side by overlapping the waterproof body.