JP7305980B2 - Dust cap for eye joint - Google Patents

Description

The present invention relates to eye joint dust caps.

Eye joint fittings are used with eye bolts (union bolts) to connect hoses and the like to equipment.
Eye joint fittings often include a metal eye joint body through which an eye bolt insertion hole is formed, and a tubular body projecting from the eye joint body and connected to a hose.
The eyebolt has a flow path extending inside the shaft portion, and a second portion formed at a portion of the shaft portion located inside the eyebolt insertion hole in a state where the eyebolt is inserted into the eyebolt insertion hole and communicated with the flow path. 1 and a second opening which is formed in the distal end surface of the shaft portion and the outer peripheral surface of the shaft portion protruding from the eyebolt insertion hole and communicates with the flow path.

Both ends in the extending direction of the eyebolt insertion hole are formed with an inner diameter that allows the shaft portion of the eyebolt to pass through, and are opened as openings in the end face portions on both sides of the eye joint main body. It is formed as a large-diameter portion having an inner diameter larger than that of the opening so as to facilitate communication with the first opening of the eyebolt.
To attach the eye joint fitting to the equipment side, one of the two end surfaces of the eye joint main body is placed on the equipment side surface via an annular seal member, and the other end surface portion is mounted with an annular seal. The eyebolt is inserted through the eyebolt insertion hole of the eyejoint main body with the member placed thereon, the lower surface of the head of the eyebolt is in elastic contact with the other end surface through the sealing member, and the male thread of the shaft of the eyebolt is attached to the device. It is done by being screwed into the internal thread on the side.
Therefore, since the end faces on both sides of the eye joint body where the openings of the eye bolt insertion holes of the eye joint body are provided serve as sealing surfaces, if scratched or the like, fluid leakage may occur during use.

Dust caps for eye joints are used to prevent such scratches on the sealing surface.
A conventional eye joint dust cap includes an annular flange that covers the end surface of the eye joint main body, and a cylindrical portion that protrudes from the inner periphery of the flange and is fitted into the opening.

Japanese Unexamined Patent Application Publication No. 2005-9503

However, in such an eye joint dust cap, each time the inner diameter of the opening of the eye joint body is different, the outer diameter of the cylindrical portion must be changed each time, and the inner diameter of the opening of the eye joint body is different. It cannot be used for eye joint fittings of various specifications, which is disadvantageous in terms of cost reduction.
The present invention has been devised in view of the above circumstances, and can be used for eye joint fittings of various specifications with different inner diameters of the opening of the eye joint body, which is excellent in versatility and advantageous in terms of cost reduction. An object of the present invention is to provide a dust cap for an eye joint that is easy to use.

In order to achieve the above object, the present invention provides an eye joint dust cap comprising a pair of lids covering both end face portions of an eye joint main body having openings for eyebolt insertion holes, wherein the pair of One of the lid portions has a lid plate portion that covers the end face portion, and a cylindrical portion that protrudes from the lid plate portion and has an outer diameter smaller than the inner diameter of the opening, and the pair of lid portions. The other is a cover plate portion that covers the end face portion, and a cover plate portion that protrudes from the cover plate portion and is removably inserted into the cylindrical portion, and this inserted state is held by friction with the cylindrical portion. and a shaft portion.
Moreover, the present invention is characterized in that the shaft portion has a tubular shape.
Further, according to the present invention, the lid provided with the cylindrical portion has a communication hole communicating with a space formed by the cylindrical portion and the shaft portion in a state where the shaft portion is inserted inside the cylindrical portion. At least one of the plate portion and the cover plate portion provided with the shaft portion is formed so as to penetrate therethrough.
Further, the present invention is characterized in that the space inside the shaft portion penetrates the cover plate portion from which the shaft portion protrudes.
Further, the present invention is characterized in that the space inside the cylindrical portion penetrates the cover plate portion from which the cylindrical portion protrudes.
Further, the present invention is characterized in that flexible connection pieces are provided for connecting the lid plate portions of the pair of lid portions.
Further, according to the present invention, one of the lid plate portions of the pair of lid portions has a detachment mechanism for detaching the cylindrical portion or the shaft portion from a state in which the shaft portion is inserted inside the cylindrical portion. It is characterized in that an operation piece is provided.

In the eye joint dust cap of the present invention, the state in which the lid plate portions of the pair of lid portions are in contact with the end face portions on both sides of the eye joint main body is the portion radially inwardly away from the inner peripheral surface of the eyebolt insertion hole. It is held by the fitted state of the cylindrical portion and the shaft portion in .
Therefore, the dust cap for an eye joint of the present invention can be used for eye joint fittings of various specifications having different inner diameters of the opening of the eye joint main body. It is advantageous in planning.
Moreover, providing the shaft portion in a cylindrical shape is advantageous in achieving weight reduction.
Further, providing a communication hole is advantageous in that the cylindrical portion and the shaft portion can be easily engaged and disengaged, and in addition, it is advantageous in maintaining the state of connection between the cylindrical portion and the shaft portion in a high-temperature atmosphere.
Further, if the space inside the shaft portion is passed through the cover plate portion from which the shaft portion protrudes, or if the space inside the cylinder portion is passed through the cover plate portion from which the cylinder portion is projected, the weight is reduced. It is advantageous in terms of
In addition, providing a connection piece is advantageous in terms of improving the handleability of the eye joint dust cap, and further providing a removal operation piece is advantageous in improving the ability to remove the cylindrical portion and the shaft portion. Become.

1 is a perspective view of an eye joint dust cap according to a first embodiment; FIG. (A) is a plan view of the eye joint dust cap of the first embodiment, and (B) is a sectional front view. (A) and (B) are cross-sectional views of the eye joint dust cap of the first embodiment taken along a plane along the axial center of the tubular body of the eye joint fitting, and (A) is a cylindrical portion and a shaft portion. (B) is a view showing a state where the shaft portion is inserted into the cylindrical portion and the cover plate portion is in contact with the end face portion, (C) is a view showing the state where the eye joint fitting tube A cross-sectional view of the eye joint dust cap of the first embodiment taken along a plane orthogonal to the axis of the body, showing a state in which the shaft portion is inserted into the cylindrical portion and the cover plate portion is in contact with the end face portion. It is a diagram. (A) is a cross-sectional front view of the eye joint dust cap of the second embodiment, and (B) is a plane along the axial center of the tubular body of the eye joint fitting, showing the eye joint dust cap of the second embodiment. A cross-sectional view of the cap, showing a state in which the shaft portion is inserted into the cylindrical portion and the cover plate portion is in contact with the end face portion, (C) is a plane perpendicular to the axis of the tube of the eye joint fitting FIG. 10 is a cross-sectional view of the eye joint dust cap of the second embodiment, showing a state where the shaft portion is inserted into the cylindrical portion and the cover plate portion is in contact with the end face portion;

(First embodiment)
An eye joint dust cap according to an embodiment of the present invention will be described below with reference to the drawings.
First, the eye joint fitting will be described with reference to FIG. 3(A).
The eye joint fitting 50 includes an eye joint main body 52 made of metal and a tubular body 54 projecting from the eye joint main body 52 .
The eye joint main body 52 is, for example, a portion connected to the device side, and the tubular body 54 is a portion connected to a hose.
An eyebolt insertion hole 56 is formed through the eye joint main body 52 , and openings 5602 of the eyebolt insertion hole 56 are positioned on both end surface portions 5202 of the eye joint main body 52 .
Between the openings 5602 at both ends of the eyebolt insertion hole 56 , that is, the intermediate portion in the extending direction of the eyebolt insertion hole 56 is formed as a large diameter portion 5604 having an inner diameter larger than that of the opening 5602 . communicates with the channel 5402 of the tubular body 54 .

The eye joint fitting 50 is arranged by connecting a hose to the tubular body 54, inserting the eye bolt through the eye bolt insertion hole 56, and attaching the eye joint main body 52 to the mounting surface on the device side.
In this case, an annular seal member is interposed between one end surface 5202 of the two end surfaces 5202 around the shaft of the eyebolt and the mounting surface of the device, and the shaft of the eyebolt is An annular sealing member is interposed between the other end face portion 5202 and the lower surface of the eyebolt head, and the eye joint body 52 of the eye joint metal fitting 50 is liquid-tight or air-tight with the mounting surface on the device side. combined.
Since the end face portions 5202 on both sides of the eye joint main body 52 function as sealing surfaces in this way, the end face portions 5202 are prevented from being damaged by the eye joint dust cap.

As shown in FIG. 1, the eye joint dust cap 10A of the present embodiment includes a pair of lids 12 and 14, a connecting piece 16, and a removing operation piece 18. As shown in FIG.
The eye joint dust cap 10A is made of synthetic resin, hard rubber, or the like, and the pair of lids 12 and 14, the connection piece 16, and the removal operation piece 18 are integrally formed.
As shown in FIGS. 2 and 3, one lid portion 12 of the pair of lid portions 12 and 14 has a lid plate portion 1202 and a cylinder portion 1204 .
The cover plate portion 1202 is formed in a circle having a uniform thickness and having a size to cover one end face portion 5202 of the end face portions 5202 on both sides of the eye joint main body 52 .
The cylindrical portion 1204 protrudes from the center of the cover plate portion 1202 and is formed in a cylindrical shape with a uniform outer diameter and a uniform inner diameter smaller than the inner diameter of the opening 5602 of the end surface portion 5202 of the eye joint main body 52 .
The height of the cylindrical portion 1204 from the cover plate portion 1202 is slightly smaller than the dimension between the end face portions 5202 on both sides of the eye joint main body 52, as shown in FIGS. ing.
As shown in FIGS. 1 and 2(B), an inclined surface 1204A whose inner diameter gradually decreases toward the cover plate portion 1202 is formed at the tip of the inner peripheral surface of the cylindrical portion 1204, and a shaft portion 1404, which will be described later, is formed. is designed to facilitate smooth insertion.

The other lid portion 14 of the pair of lid portions 12 and 14 has a lid plate portion 1402 and a shaft portion 1404 .
The cover plate portion 1402 is formed in a circular shape having a uniform thickness and having a size to cover the other end surface portion 5202 of the end surface portions 5202 on both sides of the eye joint main body 52. It is formed with the same dimensions as the projecting cover plate portion 1202 .
In this embodiment, the shaft portion 1404 has a tubular shape and is formed in a cylindrical shape with a uniform inner diameter and a uniform outer diameter.
A cylindrical shaft portion 1404 protrudes from the center of the cover plate portion 1402 and is removably inserted into the cylindrical portion 1204. This inserted state causes friction with the cylindrical portion 1204 (the outer peripheral surface of the shaft portion 1404). and friction with the inner peripheral surface of the cylindrical portion 1204). In other words, the tubular shaft portion 1404 is provided so as to be detachably fitted inside the tubular portion 1204 .
Specifically, the outer diameter of shaft portion 1404 is slightly larger than the inner diameter of cylindrical portion 1204 .

The height of the cylindrical shaft portion 1404 from the cover plate portion 1402 is slightly smaller than the dimension between the end face portions 5202 on both sides of the eye joint body 52, as shown in FIGS. 3(B) and 3(C). is formed by In the present embodiment, the height of cylindrical portion 1204 from lid plate portion 1202 is the same as that of cylindrical portion 1204, and a large contact area between the inner peripheral surface of cylindrical portion 1204 and the outer peripheral surface of shaft portion 1404 is ensured. Thus, it is advantageous in maintaining the protection of the end face portions 5202 on both sides by the cover plate portions 1202 and 1402 in a stable state.
As shown in FIGS. 1 and 2B, the tip of the outer peripheral surface of the cylindrical shaft portion 1404 is formed with an inclined surface 1404A whose outer diameter gradually decreases toward the tip. It is designed for smooth insertion.
Although the shaft portion 1404 may be formed in a solid shape, forming it in a cylindrical shape as in the present embodiment is advantageous in terms of weight reduction.

At least one of the portion of the cover plate portion 1202 located radially inside the tubular portion 1204 and the portion of the cover plate portion 1402 located radially inside the tubular shaft portion 1404 has a cover plate portion A communication hole 20 passing through 1202 and 1402 is provided. In the present embodiment, the communication hole 20 is provided at a portion of the cover plate portion 1202 located radially inside the tubular portion 1204 .
As shown in FIGS. 3B and 3C, the communication hole 20 is formed in the space formed by the cylindrical portion 1204 and the shaft portion 14 when the shaft portion 1404 is inserted inside the cylindrical portion 1204. They are provided so as to communicate with each other, which is advantageous in smoothly inserting the shaft portion 1404 into the cylindrical portion 1204 and removing the shaft portion 1404 from the cylindrical portion 1204 .
In addition, for example, in a high-temperature atmosphere in which the eye joint dust cap 10A is loaded on the bed of a truck in midsummer, the communicating hole 20 is formed between the cylindrical portion 1204 and the shaft portion with the shaft portion 1404 inserted inside the cylindrical portion 1204. 14 and 14. When the shaft portion 1404 is inserted inside the cylindrical portion 1204, the volume of the space formed by the cylindrical portion 1204 and the shaft portion 14 expands. It is also advantageous in preventing the portion 1404 from being detached from the tubular portion 1204 .
When the shaft portion 1404 has a solid shape, the communication hole 20 may be formed through the shaft portion 1404 so as to communicate with the space inside the cylindrical portion 1204 .

The connection piece 16 extends between the pair of lid portions 12 and 14 and connects the pair of lid plate portions 1202, and is elongated and flexible.
Although the connection piece 16 may be omitted, the provision of the connection piece 16 prevents loss of the lids 12 and 14 that would have been separated from each other in the absence of the connection piece 16, that is, loss of the eye joint dust cap 10A. In addition, it is advantageous in improving the handleability.
The shape of the connection piece 16 may be rod-like or the like, and is not limited to a thin plate like in the embodiment.

The removal operation piece 18 is a portion used when removing the cylindrical portion 1204 or the shaft portion 1404 from the state in which the shaft portion 1404 is inserted inside the cylindrical portion 1204, and is used to remove either of the pair of lid portions 12 and 14. It is provided on the lid plate portions 1202 and 1402 of one of the lid portions 12 and 14 .
The removal operation piece 18 may be omitted, but if the removal operation piece 18 is provided, the cylinder portion 1204 or the shaft portion 1404 can be easily removed from the state in which the shaft portion 1404 is inserted inside the cylinder portion 1204. advantage over
In the present embodiment, a shaft portion 1404 is provided so as to extend linearly from the outer peripheral portion of the cover plate portion 1202 which protrudes, and an uneven portion 1802 is provided at the end portion so as to facilitate gripping.
As shown in FIG. 2A, the removing operation piece 18 is provided so as to extend in the same straight line as the connection piece 16, and the eye joint dust cap 10A is attached to the eye joint main body 52. It is designed so that it does not take up much space.

Next, how to use the eye joint dust cap 10A will be described.
When using the eye joint dust cap 10A, as shown in FIGS. 3A and 3B, the connection piece 16 is bent so that the pair of lids 12 and 14 face each other over the eyebolt insertion hole 56, and the cylindrical portion A cylindrical shaft portion 1404 is pushed into the inner side of the eye joint body 52 so that the lid plate portions 1202 and 1402 of the pair of lid portions 12 and 14 are brought into contact with the end face portions 5202 on both sides of the eye joint main body 52 .
When the lid plate portions 1202 and 1402 of the pair of lid portions 12 and 14 are in contact with the end surface portions 5202 on both sides of the eye joint main body 52, the inner peripheral surface of the cylindrical portion 1204 and the outer peripheral surface of the shaft portion 1404 are aligned. Retained by friction.
When removing the pair of lids 12 and 14 from the eye joint main body 52 , the removal operation piece 18 is gripped and the shaft 1404 is pulled out from the cylinder 1204 .

According to the eye joint dust cap 10A of the present embodiment, the state in which the lid plate portions 1202 and 1402 of the pair of lid portions 12 and 14 are in contact with the end surface portions 5202 on both sides of the eye joint main body 52 is when the eye bolt is inserted. The cylindrical portion 1204 and the shaft portion 1404 are held in a fitted state at a location spaced radially inward from the inner peripheral surface of the hole 56 , and the end surface portions 5202 on both sides are protected by the cover plate portions 1202 , 1402 .
Therefore, if the cylindrical portion 1204 can be inserted inside the opening 5602, the eye joint dust cap 10A can be used for the eye joint main body 52 having the opening 5602 of the eyebolt insertion hole 56 with a different inner diameter.
That is, the eye joint dust cap 10A of the present embodiment can be used for eye joint fittings 50 of various specifications having different inner diameters of the opening 5602 of the eye joint main body 52, and is excellent in versatility. This is advantageous in terms of reducing the cost of the dust cap 10A.

Next, a second embodiment will be described with reference to FIG.
In the following embodiments, portions and members that are the same as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted, and different portions are mainly described.
The eye joint dust cap 10B of the second embodiment is characterized in that a cylindrical space 1204B inside a cylindrical portion 1204 penetrates a cover plate portion 1202 from which the cylindrical portion 1204 protrudes and The second embodiment differs from the first embodiment in that a cylindrical space 1404B inside the shaft portion 1404 penetrates the cover plate portion 1202 from which the shaft portion 1404 protrudes.
According to the second embodiment, compared with the first embodiment, it is advantageous in achieving weight reduction.

In this embodiment, cover plate portions 1202 and 1402 are circular in shape, but cover plate portions 1202 and 1402 are not limited to circular shapes as long as they cover end face portion 5202 .
Further, in the present embodiment, the case where both cylindrical portion 1204 and shaft portion 1404 are cylindrical has been described, but when shaft portion 1404 is inserted inside cylindrical portion 1204, cylindrical portion 1204 and shaft portion 1404 are both cylindrical. It may be held by friction with the shaft portion 1404, and both the cylindrical portion 1204 and the shaft portion 1404 may have a hollow triangular prism shape, a square prism shape, a polygonal prism shape, or the like.

10A, 10B Eye joint dust caps 12, 14 Lid portions 1202, 1402 Lid plate portion 1204 Cylindrical portion 1204A Inclined surface 1204B Space 1404 Shaft portion 1404A Inclined surface 1404B Space 16 Connection piece 18 Removal operation piece 20 Communication hole 50 Eye joint fitting 52 eye joint main body 5202 end face portion 54 tubular body 5402 flow path 56 eye bolt insertion hole 5602 opening 5604 large diameter portion

Claims (7)

A dust cap for an eye joint comprising a pair of lids covering end faces on both sides of an eye joint main body having openings for eye bolt insertion holes,
One lid portion of the pair of lid portions has a lid plate portion covering the end face portion and a tubular portion projecting from the lid plate portion,
The cylindrical portion has an outer diameter smaller than the inner diameter of the opening and has an inner peripheral surface formed with a uniform inner diameter ,
The other lid portion of the pair of lid portions has a lid plate portion covering the end surface portion and a shaft portion projecting from the lid plate portion,
The shaft portion is formed with an outer peripheral surface having a uniform outer diameter and is detachably inserted into the inner peripheral surface of the cylindrical portion, and this inserted state is maintained by friction between the inner peripheral surface and the outer peripheral surface. is provided as
In the eyebolt insertion hole, the outer peripheral surface is inserted into the inner peripheral surface, and the lid plate portion of the one lid portion is in contact with the one end surface portion. The contact state of the lid plate portion of the other lid portion is maintained by friction between the inner peripheral surface and the outer peripheral surface.
A dust cap for an eye joint characterized by: The shaft portion has a tubular shape,
The eye joint dust cap according to claim 1, characterized in that: A communication hole communicating with a space formed by the cylindrical portion and the shaft portion in a state where the shaft portion is inserted inside the cylindrical portion is formed in the cover plate portion provided with the cylindrical portion, or the At least one of the lid plate portions provided with a shaft portion is formed to penetrate,
The eye joint dust cap according to claim 2, characterized in that: The space inside the shaft penetrates through the cover plate portion from which the shaft protrudes.
The eye joint dust cap according to claim 2, characterized in that: The space inside the cylindrical portion penetrates the cover plate portion from which the cylindrical portion protrudes.
5. The eye joint dust cap according to claim 2 or 4, characterized in that: A connection piece having flexibility is provided for connecting the lid plate portions of the pair of lid portions,
The eye joint dust cap according to any one of claims 1 to 5, characterized in that: Either one of the pair of lid portions is provided with a removal operation piece for removing the cylindrical portion or the shaft portion from a state in which the shaft portion is inserted inside the cylindrical portion. ing,
The eye joint dust cap according to any one of claims 1 to 6, characterized in that:
Pu.

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