JP2020133731A - Dust cap for eye joint - Google Patents

Abstract

To provide a dust cap for an eye joint capable of being used in eye joint brackets of various specifications whose opening parts have different inner diameters, excellent in versatility, and advantageous in cost reduction.SOLUTION: A dust cap 10A for an eye joint comprises a pair of lid parts 12, 14 that cover an end surface part 5202 on both sides of an eye joint body 52 in which an opening part 5602 of an eyebolt insertion hole 56 is provided. One of the pair of lid parts 12, 14 has a cover plate part 1202 that covers the end surface part 5202, and a cylindrical part 1204 whose outer diameter is smaller than the inner diameter of the opening part 5602 and that protrudes from the cover plate 1202. The other of the pair of lid parts 12, 14 has the cover plate part 1202 that covers the end surface part 5202, and a shaft part 1404 that protrudes from the cover plate part 1202 and is removably inserted inside the cylindrical part 1204, and in which the inserted state is retained by friction with the cylindrical part 1204.SELECTED DRAWING: Figure 3

Description

The present invention relates to a dust cap for an eye joint.

Eye joint metal fittings are used together with eye bolts (union bolts) to connect hoses and the like to equipment.
In many cases, the eye joint fitting includes a metal eye joint body through which an eye bolt insertion hole is formed, and a tube body protruding from the eye joint body and connected to a hose.
The eyebolts are formed at a flow path extending inside the shaft portion and a shaft portion located inside the eyebolt insertion hole with the eyebolt inserted into the eyebolt insertion hole, and communicate with the flow path. It has an opening of 1 and a second opening formed on the tip surface of the shaft portion and the outer peripheral surface of the shaft portion protruding from the eyebolt insertion hole and communicating with the flow path.

Both ends of the eyebolt insertion hole in the extending direction are formed with an inner diameter through which the shaft portion of the eyebolt is inserted, and are opened as openings on both end faces of the eye joint body. It is formed as a large-diameter portion having an inner diameter larger than that of the opening so that it can easily communicate with the first opening of the eyebolt.
To attach the eye joint metal fitting to the device side, one end face portion of the end face portions on both sides of the eye joint body is placed on the device side surface via an annular seal member, and the ring seal is provided on the other end face portion. The eyebolt is inserted into the eyebolt insertion hole of the eye joint body with the member mounted, the lower surface of the head of the eyebolt is elastically contacted with the other end face portion via the seal member, and the male screw of the shaft portion of the eyebolt is a device. It is done by being screwed into the female screw on the side.
Therefore, since the end faces on both sides of the eye joint body provided with the opening of the eye bolt insertion hole of the eye joint body serve as a sealing surface, if scratches or the like are made, it may cause fluid leakage during use.

The dust cap for eye joints is used to prevent such scratches on the sealing surface.
A conventional dust cap for an eye joint includes an annular flange portion that covers an end face portion of the eye joint body, and a tubular portion that protrudes from the inner peripheral portion of the collar portion and is fitted into an opening.

Japanese Unexamined Patent Publication No. 2005-9503

However, in such a dust cap for an eye joint, the outer diameter of the tubular portion must be different each time the inner diameter of the opening of the eye joint body is different, and the inner diameter of the opening of the eye joint body is different. It could not be used for eye joint metal fittings of various specifications, which was disadvantageous in terms of cost reduction.
The present invention has been made in view of the above circumstances, and can be used for eye joint metal fittings having various specifications in which the inner diameter of the opening of the eye joint body is different, which is excellent in versatility and advantageous in terms of cost reduction. It is an object of the present invention to provide a dust cap for an eye joint.

In order to achieve the above object, the present invention is an eye joint dust cap provided with a pair of lids covering both end faces of an eye joint body provided with an opening for an eye bolt insertion hole. One of the lid portions has a lid plate portion that covers the end face portion and a tubular portion that protrudes from the lid plate portion with an outer diameter smaller than the inner diameter of the opening, and the pair of lid portions. The other is a lid plate portion that covers the end face portion and a lid plate portion that protrudes from the lid plate portion and is detachably inserted inside the cylinder portion, and this inserted state is held by friction with the cylinder portion. It is characterized by having a shaft portion.
Further, the present invention is characterized in that the shaft portion has a tubular shape.
Further, in the present invention, the lid provided with the tubular portion is provided with a communication hole communicating with the space formed by the tubular portion and the shaft portion in a state where the shaft portion is inserted inside the tubular portion. It is characterized in that it is formed through at least one of the plate portion or the lid plate portion provided with the shaft portion.
Further, the present invention is characterized in that the space inside the shaft portion penetrates the lid plate portion on which the shaft portion is projected.
Further, the present invention is characterized in that the space inside the tubular portion penetrates the lid plate portion on which the tubular portion is projected.
Further, the present invention is characterized in that a flexible connecting piece for connecting the lid plate portions of the pair of lid portions is provided.
Further, in the present invention, the lid plate portion of any one of the pair of lid portions is removed to remove the cylinder portion or the shaft portion from the state in which the shaft portion is inserted inside the cylinder portion. It is characterized in that an operation piece is provided.

In the dust cap for an eye joint of the present invention, the state where the lid plates of the pair of lids are in contact with the end faces on both sides of the eye joint body is located radially inward from the inner peripheral surface of the eyebolt insertion hole. It is held by the fitted state of the cylinder portion and the shaft portion in.
Therefore, the dust cap for eye joints of the present invention can be used for eye joint metal fittings having various specifications having different inner diameters of the openings of the eye joint body, and has excellent versatility and reduces the cost of the dust cap for eye joints. It will be advantageous in planning.
Further, if the shaft portion is provided in a tubular shape, it is advantageous in terms of weight reduction.
Further, providing the communication hole is advantageous in easily engaging and disengaging the cylinder portion and the shaft portion, and further is advantageous in maintaining the bonded state of the cylinder portion and the shaft portion in a high temperature atmosphere.
Further, if the space inside the shaft portion is passed through the lid plate portion on which the shaft portion is projected, or the space inside the cylinder portion is passed through the lid plate portion on which the cylinder portion is projected, the weight is reduced. It will be advantageous in trying to make it.
Further, providing a connection piece is advantageous in improving the handleability of the dust cap for the eye joint, and further, providing a removal operation piece is advantageous in improving the removability of the cylinder portion and the shaft portion. Become.

It is a perspective view of the dust cap for an eye joint of 1st Embodiment. (A) is a plan view of the dust cap for an eye joint according to the first embodiment, and (B) is a front sectional view. (A) and (B) are cross-sectional views of the eye joint dust cap of the first embodiment cut on a plane along the axis of the tube of the eye joint metal fitting, and (A) is a shaft portion on the cylinder portion. (B) is a diagram showing a state in which the shaft portion is inserted into the cylinder portion and the lid plate portion is in contact with the end face portion, and (C) is a diagram showing a state in which the eye joint metal fitting is started. In the cross-sectional view of the eye joint dust cap of the first embodiment cut on a plane orthogonal to the axis of the body, a state in which the shaft portion is inserted into the tubular portion and the lid plate portion is in contact with the end face portion is shown. It is a figure. (A) is a cross-sectional front view of the dust cap for the eye joint of the second embodiment, and (B) is a plane along the axis of the tube of the eye joint metal fitting, and the dust for the eye joint of the second embodiment. A cross-sectional view of the cap cut, showing a state in which the shaft portion is inserted into the cylinder portion and the lid plate portion is in contact with the end face portion, (C) is a plane orthogonal to the axis of the tube body of the eye joint metal fitting. It is sectional drawing which cut | cut the dust cap for eye joint of 2nd Embodiment, and is the figure which showed the state which the shaft part was inserted into the cylinder part, and the lid plate part was in contact with end face part.

(First Embodiment)
Hereinafter, the dust cap for an eye joint according to the embodiment of the present invention will be described with reference to the drawings.
First, the eye joint metal fitting will be described with reference to FIG. 3 (A).
The eye joint metal fitting 50 includes a metal eye joint body 52 and a pipe body 54 projecting from the eye joint body 52.
The eye joint body 52 is, for example, a portion connected to the device side, and the pipe body 54 is a portion connected to the hose.
An eyebolt insertion hole 56 is formed through the eye joint body 52, and an opening 5602 of the eyebolt insertion hole 56 is located on both end face portions 5202 of the eye joint 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, and the large diameter portion 5604 Is communicated with the flow path 5402 of the pipe body 54.

The eye joint metal fitting 50 is arranged by connecting a hose to the pipe body 54, inserting the eye bolt into 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 sealing member is interposed between the end face portion 5202 of one of the end face portions 5202 on both sides and the mounting surface on the device side around the shaft portion of the eyebolt, and the shaft portion of the eyebolt. An annular sealing member is interposed between the other end face portion 5202 and the lower surface of the head of the eyebolt, and the eye joint body 52 of the eye joint metal fitting 50 is liquid-tight or airtight on the mounting surface on the device side. To be combined.
Since the end face portions 5202 on both sides of the eye joint body 52 function as sealing surfaces in this way, the end face portions 5202 are prevented from being scratched 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 lid portions 12 and 14, a connection piece 16, and a removal operation piece 18.
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 molded.
As shown in FIGS. 2 and 3, one of the pair of lids 12 and 14 has a lid plate portion 1202 and a cylinder portion 1204.
The lid plate portion 1202 is formed in a circular shape having a uniform thickness and covering one end face portion 5202 of the end face portions 5202 on both sides of the eye joint main body 52.
The tubular portion 1204 projects from the center of the lid 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 face portion 5202 of the eye joint body 52.
As shown in FIGS. 3B and 3C, the height of the tubular portion 1204 from the lid plate portion 1202 is formed to be slightly smaller than the dimension between the end face portions 5202 on both sides of the eye joint main body 52. ing.
As shown in FIGS. 1 and 2B, an inclined surface 1204A whose inner diameter gradually decreases as it approaches the lid plate portion 1202 is formed at the tip of the inner peripheral surface of the tubular portion 1204, and a shaft portion 1404 described later is formed. Is designed to facilitate the insertion of.

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 lid plate portion 1402 is formed in a circular shape having a uniform thickness and a size covering the other end face portion 5202 of the end face portions 5202 on both sides of the eye joint body 52, and the thickness and outer diameter of the lid plate portion 1402 are as follows. It is formed with the same dimensions as the projecting lid plate portion 1202.
In the present embodiment, the shaft portion 1404 has a tubular shape, and is formed in a cylindrical shape having a uniform inner diameter and a uniform outer diameter.
The tubular shaft portion 1404 is projected from the center of the lid plate portion 1402 and is detachably inserted inside the tubular portion 1204, and the inserted state is friction with the tubular portion 1204 (the outer peripheral surface of the shaft portion 1404). It is provided so as to be held by friction with the inner peripheral surface of the cylinder 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 the shaft portion 1404 is formed to be slightly larger than the inner diameter of the tubular portion 1204.

As shown in FIGS. 3 (B) and 3 (C), the height of the tubular shaft portion 1404 from the lid plate portion 1402 is slightly smaller than the dimension between the end face portions 5202 on both sides of the eye joint body 52. Is formed of. In the present embodiment, the tubular portion 1204 is formed to have the same height as the lid plate portion 1202, and a large contact area between the inner peripheral surface of the tubular portion 1204 and the outer peripheral surface of the shaft portion 1404 is secured, which will be described later. As described above, it is advantageous to maintain the protection of the end face portions 5202 on both sides by the lid plate portions 1202 and 1402 in a stable state.
As shown in FIGS. 1 and 2B, an inclined surface 1404A having an outer diameter gradually decreasing as it approaches the tip is formed at the tip of the outer peripheral surface of the tubular shaft portion 1404, and the tubular shaft portion 1404 is attached to the tubular portion 1204. It is designed for smooth insertion.
The shaft portion 1404 may be formed in a solid shape, but if it is formed in a tubular shape as in the present embodiment, it is advantageous in terms of weight reduction.

Further, at least one of the lid plate portion 1202 located inside the tubular portion 1204 in the radial direction or the lid plate portion 1402 located radially inside the tubular shaft portion 1404, the lid plate portion. A communication hole 20 that penetrates 1202 and 1402 is provided. In the present embodiment, the communication hole 20 is provided at the lid plate portion 1202 located inside the tubular portion 1204 in the radial direction.
As shown in FIGS. 3 (B) and 3 (C), the communication hole 20 is formed in a space formed by the tubular portion 1204 and the shaft portion 14 with the shaft portion 1404 inserted inside the tubular portion 1204. It is provided so as to communicate with each other, and is advantageous in smoothly inserting the shaft portion 1404 into the tubular portion 1204 and removing the shaft portion 1404 from the tubular portion 1204.
Further, for example, in a high temperature atmosphere in which the eye joint dust cap 10A is loaded on the loading platform of the truck in midsummer, the communication hole 20 has the cylinder portion 1204 and the shaft portion with the shaft portion 1404 inserted inside the cylinder portion 1204. It also functions as an air bleeding hole in the space formed by 14 and the shaft due to the expansion of the volume of the space formed by the cylinder 1204 and the shaft 14 with the shaft 1404 inserted inside the cylinder 1204. It is also advantageous in preventing the portion 1404 from being removed 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 tubular portion 1204.

The connecting piece 16 extends between the pair of lid portions 12 and 14 and connects the pair of lid plate portions 1202, and has an elongated shape and is flexible.
The connection piece 16 may be omitted, but if the connection piece 16 is provided, the lid portions 12 and 14 separated from each other when the connection piece 16 is not provided can be prevented from being lost, that is, the eye joint dust cap 10A can be prevented from being lost. In addition, it is advantageous in improving the handleability.
The shape of the connecting piece 16 may be rod-shaped or the like, and is not limited to a thin plate shape as in the embodiment, as long as it has flexibility, and the cross-sectional shape is arbitrary.

The removal operation piece 18 is a portion used when removing the cylinder portion 1204 or the shaft portion 1404 from the state where the shaft portion 1404 is inserted inside the cylinder portion 1204, and is any one 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 where the shaft portion 1404 is inserted inside the cylinder portion 1204. It will be advantageous on.
In the present embodiment, the shaft portion 1404 is provided so as to extend linearly from the outer peripheral portion of the lid plate portion 1202 in which the shaft portion 1404 is projected, and the end portion is provided with the uneven portion 1802 so as to be easily gripped.
Further, as shown in FIG. 2A, the removal operation piece 18 is provided so as to extend in the same linear shape as the connection piece 16, and the eye joint dust cap 10A is attached to the eye joint main body 52. In the state, it is designed not to take up 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 curved so that the pair of lids 12 and 14 face each other on the eyebolt insertion hole 56, and the tubular portion is formed. The tubular shaft portion 1404 is pushed inside the 1204, and 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.
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 a state in which the inner peripheral surface of the tubular portion 1204 and the outer peripheral surface of the shaft portion 1404 are in contact with each other. Held by friction.
Further, when removing the pair of lid portions 12 and 14 from the eye joint main body 52, the removal operation piece 18 is grasped and the shaft portion 1404 is pulled out from the tubular portion 1204.

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

Next, a second embodiment will be described with reference to FIG.
In the following embodiments, the same parts and members as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and different parts will be mainly described.
In the eye joint dust cap 10B of the second embodiment, the columnar space 1204B inside the tubular portion 1204 penetrates the lid plate portion 1202 in which the tubular portion 1204 is projected, and the tubular portion 1202 has a tubular shape. The columnar space 1404B inside the shaft portion 1404 is different from the first embodiment in that the shaft portion 1404 penetrates the lid plate portion 1202 projecting from the shaft portion 1404.
According to the second embodiment, it is advantageous in reducing the weight as compared with the first embodiment.

In the present embodiment, the case where the lid plate portions 1202 and 1402 have a circular shape has been described, but the lid plate portions 1202 and 1402 may have a shape that covers the end face portion 5202 and are not limited to the circular shape.
Further, in the present embodiment, the case where both the tubular portion 1204 and the shaft portion 1404 have a cylindrical shape has been described, but the state in which the shaft portion 1404 is inserted inside the tubular portion 1204 is the tubular portion 1204. It may be held by friction with the shaft portion 1404, and both the tubular portion 1204 and the shaft portion 1404 may have a hollow triangular columnar shape, a square columnar shape, a polygonal columnar shape, or the like.

10A, 10B Eye joint dust caps 12, 14 Lid part 1202, 1402 Lid plate part 1204 Tube part 1204A Inclined surface 1204B Space 1404 Shaft part 1404A Inclined surface 1404B Space 16 Connection piece 18 Detachment operation piece 20 Communication hole 50 Eye joint metal fittings 52 Eye joint body 5202 End face 54 Tube body 5402 Flow path 56 Eyebolt insertion hole 5602 Opening 5604 Large diameter part

Claims (7)

An eye joint dust cap having a pair of lids covering both end faces of an eye joint body provided with an opening for an eye bolt insertion hole.
One of the pair of lid portions has a lid plate portion that covers the end face portion and a tubular portion that protrudes from the lid plate portion with an outer diameter smaller than the inner diameter of the opening.
The other of the pair of lids is a lid plate portion that covers the end face portion and a lid plate portion that protrudes from the lid plate portion and is detachably inserted into the inside of the cylinder portion, and the inserted state is the cylinder portion. Has a shaft that is held by friction of
A dust cap for eye joints that features this. The shaft portion has a tubular shape.
The dust cap for an eye joint according to claim 1. A communication hole that communicates with the space formed by the cylinder portion and the shaft portion in a state where the shaft portion is inserted inside the cylinder portion is the lid plate portion provided with the cylinder portion, or the lid plate portion. It is formed through at least one of the lid plate portions provided with the shaft portion.
2. The dust cap for an eye joint according to claim 2. The space inside the shaft portion penetrates the lid plate portion on which the shaft portion is projected.
2. The dust cap for an eye joint according to claim 2. The space inside the tubular portion penetrates the lid plate portion on which the tubular portion is projected.
The dust cap for an eye joint according to claim 2 or 4. A flexible connecting piece for connecting the lid plate portions of the pair of lid portions is provided.
The dust cap for an eye joint according to any one of claims 1 to 5, wherein the dust cap is for an eye joint. The lid plate portion of any one of the pair of lid portions is provided with a removal operation piece for removing the cylinder portion or the shaft portion from the state in which the shaft portion is inserted inside the cylinder portion. ing,
The dust cap for an eye joint according to any one of claims 1 to 6, wherein the dust cap is for an eye joint.
P.

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