JPH0828607A - Plug for inspection hole - Google Patents

Abstract

PURPOSE:To make it hard for a rubber plug to be slipped off during the periods it is used, and mak it easy to draw out it during inspection by providing a pin to be inserted into the rubber plug so that it can penetrate through the inside of it, and forming the rubber plug so that the outside diameter of an inner side collar part of the rubber plug becomes smaller in state where the pin is not inserted. CONSTITUTION:The rubber plug removed when the state of a brake shoe inside a brake drum is inspected, and after inspection it is fitted-in in order to prevent muddy water and dust from entering. In this case, the rubber plug 10 is formed of a cylindrical part 11 externally abutting on the inside periphery of an inspection hole 2, an outer side collar part 12 abutting on the outer side wall of the inspection hole 2 in continuous with the cylindrical part 11, and an inner side collar part 13 abutting on the inner side wall of the inspection hole 2 in continuous with the cylindrical part 11. Further, a metal pin 20 is provided so that it can penetrate through the inside of the rubber plug 10 along the center axis of the cylindrical part 11. The rubber plug 10 is formed so that the outer diameter of the inner side collar part 13 becomes smaller in a state where the metal pin 20 is not inserted. Thus, removal and fitting of the rubber plug 10 for blocking up the inspection hole 2 can be performed easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a plug to be fitted in an inspection hole or other inspection hole provided on a wall surface of a brake drum for inspecting a brake of an automobile. Although the present invention was developed as an automobile part, this structure can be widely used as other parts.

[0002]

2. Description of the Related Art The brake drum of an automobile is provided with an inspection hole so that the condition of the internal brake shoe can be inspected without disassembling. In particular, when adjusting the parking brake, the tip of the driver is inserted into this inspection hole and used to rotate the internal adjusting screw. As shown in FIG. 7, a rubber plug 30 is fitted into the inspection hole 2 in order to prevent water and dust from entering the inspection hole 2 in a normal use state.

[0003]

The brake drum is a member that receives centrifugal force due to high speed rotation in use, and contacts the outer wall so that the plug 30 inserted into the inspection hole 2 does not come off. The outer flange 32 and the inner flange 33 in contact with the inner wall are made larger in diameter and are made of a relatively hard rubber material. For this reason, if the plug 30 is to be unplugged at the time of inspection, considerable force and force will be required.

An object of the present invention is to provide an inspection hole plug which is difficult to pull out during use and easy to pull out during inspection.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a plug that is removed when checking the condition of a brake shoe inside a brake drum, and that is inserted after the check to prevent intrusion of muddy water or dust. From the cylindrical part that is circumscribed on the inner circumference of the inspection hole, the outer flange that is continuous with this cylindrical part and that contacts the outer wall of the inspection hole, and the inner flange that is continuous with this cylindrical part and that contacts the inner wall of the inspection hole. And a pin inserted so as to penetrate through the inside of the rubber plug along the central axis of the tubular portion, and the outer diameter of the inner flange portion of the rubber plug is reduced in a state where the pin is not inserted. It is characterized in that it is formed as follows.

The inner flange portion is provided with a plurality of slits along the radial direction from the central axis, and the pin has heads with large outer diameters formed at both ends, and one of the heads has a grip knob. Are preferably formed. The pin is preferably made of metal, but may be made of plastic, ceramic or other material.

[0007]

[Function] When the inspection hole is closed, the inner collar is pressed against the inspection hole, so that even if the outer diameter of the inner collar is slightly larger than the inner diameter of the inspection hole, the elasticity of rubber and multiple slips The inner collar part is temporarily deformed by splitting and brakes
The inner collar is released at the position where it is pushed into the drum and the outer collar contacts the outer wall of the inspection hole to restore temporary deformation.

By inserting the pin into the tubular portion in this state, the slit is opened and the inner flange portion is expanded in the outer peripheral direction to fix the rubber plug to the inner wall surface of the inspection hole. Since both ends of the pin have heads that are larger than the outer diameter of the shaft, the heads engage the side surfaces of the outer and inner flanges and may fall off even when subjected to centrifugal force. Fixed so that there is no.

At the time of opening the inspection hole, the grip of the pin is pulled out to restore the outer circumference of the inner flange portion to the original shape and reduce the size. If the rubber plug is pulled toward you in this state, the inner flange will be easily separated from the inspection hole.

In this way, the rubber plug and pin can be pushed or pulled out by a slight force to attach or detach the plug, and the work time required for incidental work for inspection and adjustment can be shortened. In addition, since the inspection hole rubber plug and the pin are in close contact with each other and are in close contact with each other in the mounted state, they do not fall off even under strong vibration, and dust and muddy water can be prevented from entering. it can.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a side sectional view showing the configuration of a plug according to an embodiment of the present invention, FIG. 2A is a rear view of a rubber plug according to an embodiment of the present invention, FIG. 2B is a side sectional view thereof, and FIG.
3 is a perspective view showing the outer shape of the rubber plug according to the embodiment of the present invention, FIG. 4 (a) is a rear view of the pin according to the embodiment of the present invention, (b) is a side view thereof, and (c) is a front view thereof. 5
Is a perspective view showing the external shape of the pin in the embodiment of the present invention,
FIG. 6 is a sectional view showing a mounted state of the plug according to the embodiment of the present invention. In the present embodiment, description will be made assuming that a metal pin is used.

The plug according to the embodiment of the present invention comprises a cylindrical portion 11 which is circumscribed on the inner circumference of the inspection hole 2 of the brake drum 1, an outer flange portion 12 which is continuous with the cylindrical portion 11 and contacts the outer wall of the inspection hole 2,
Also, the rubber plug 10 including the inner flange portion 13 which is continuous with the tubular portion 11 and contacts the inner wall of the inspection hole 2, and the tubular portion 11
And a metal pin 20 inserted so as to penetrate the inside of the rubber plug 10 along the central axis of the rubber plug 1.
0 is the inner flange 13 with the metal pin 20 not inserted.
Is formed to have a smaller outer diameter.

The inner flange portion 13 is provided with a plurality of slits 13a in the radial direction from the central axis, and the metal pin 2
In No. 0, heads 21 and 22 having large outer diameters are formed on both ends, and a grip knob 23 is formed on one of the heads 21. The outer diameter of the head portion 22 is formed to be slightly smaller than that of the head portion 21 in order to facilitate insertion into the tubular portion 11 of the rubber plug 10. Further, on the outer flange 12 side of the rubber plug 10, a recess 10a having a depth substantially the same as the height of the head 21 of the metal pin 20 is formed.
Is provided, and the through hole 10b is formed by a tapered surface so that the inner diameter thereof becomes smaller toward the inner flange portion 13 side. Further, the outer circumference corresponding to the tapered surface of the tubular portion 11 coupled to the inner flange portion 13 is a cylinder on the outer flange portion 12 side when the metal pin 20 is inserted into the through hole 10b and the tapered surface is expanded in the outer circumferential direction. The outer diameter is tapered so that the outer diameter is substantially the same as the outer diameter of the shape portion 11.

The rubber plug 10 constructed as described above is attached to the central axis of the inspection hole 2 of the brake drum 1 so that the rubber plug 10 is formed.
When the metal pins 20 are not inserted, the outer diameter of the inner collar 13 is substantially the same as the inner diameter of the inspection hole 2, and the plurality of slits 13
Since a is provided, even if the outer diameter of the inner flange portion 13 is slightly large, it is temporarily deformed and easily passes through the inspection hole 2 so that the inner side surface of the outer collar portion 12 is the wall surface of the brake drum 1. Abut.

In this state, the gripping knob 23 of the metal pin 20
Is gripped and inserted into the through hole 10b of the rubber plug 10, the outer peripheral surface of the shaft portion of the metal pin 20 pushes the tapered portion in the through hole 10b outward. Along with this slit 1
3a opens, and the outer diameter of the inner collar portion 13 increases, so that the inner surface of the inner collar portion 13 is brought into contact with the inner wall surface of the brake drum 1. As a result, the rubber plug 10 is fixed while the wall surface of the brake drum 1 is sandwiched between the inner side surfaces of the outer flange portion 12 and the inner flange portion 13.

The head 22 of the metal pin 20 on the side to be pushed into the through hole 10b is formed to have an outer diameter larger than the outer diameter of its shaft portion, but the rubber plug 10 is formed of a flexible material. So through hole 1 when pushed
0b can be expanded and passed, and after the passage, the elastic force of the rubber plug 10 tries to return to the original shape, and the through hole 10b and the shaft portion of the metal pin 20 are brought into close contact with each other. Furthermore, the inner side surface of the head portion 22 that has passed through the through hole 10b engages with the end surface of the rubber plug 10 to prevent it from coming off.
The metal pin 20 is fixed without falling off.

As a result, the inspection hole 2 and the rubber plug 10,
Also, the rubber plug 10 and the metal pin 20 are brought into close contact with each other to prevent muddy water or dust from entering the brake drum 1. Further, since the inspection hole 2, the rubber plug 10 and the metal pin 20 are engaged with each other with a step, the inspection hole 2, the rubber plug 10 and the metal pin 20 are prevented from falling off even if they are subjected to a high-speed centrifugal force due to vehicle running.

When the inside of the brake drum 1 is to be inspected, the head 22 extends through the through hole 10b of the rubber plug 10 and can be easily removed by pulling the metal pin 20 by the gripping knob 23. . Metal pin 2
When 0 is removed, the through hole 10b expanded by the shaft portion of the metal pin 20 returns to its original shape, and the outer diameter of the inner flange portion 13 decreases accordingly. The rubber plug 10 can be easily removed from the inspection hole 2 by pulling it out to the front. At this time, even if the outer periphery of the inner flange portion 13 is caught in the inspection hole 2, the rubber plug 10 is flexible and has the slit 13a, so that the rubber plug 10 is temporarily deformed and can be easily extracted. .

Although the embodiments of the present invention have been described for the brake drums of automobiles, the present invention is not limited to the brake drums, and is used as a plug of a container which is used in other fields and which is closed except during inspection and maintenance. Can be widely used.

[0020]

As described above, according to the present invention, it is possible to easily remove and fit the rubber plug that closes the inspection hole provided on the wall surface of the container requiring inspection and maintenance such as brakes and drums. When it is fitted, it becomes a sealed state to prevent dust and muddy water from entering,
And it can be prevented from falling off even if it receives a strong vibration. Further, this makes it possible to shorten the time required for incidental work such as attaching and detaching the plug for checking or adjusting the inside of the brake shoe.

[Brief description of drawings]

FIG. 1 is a side sectional view showing the configuration of a plug according to an embodiment of the present invention.

2A is a rear view of a rubber plug according to an embodiment of the present invention, FIG. 2B is a side sectional view thereof, and FIG. 2C is a front view thereof.

FIG. 3 is a perspective view showing an outer shape of a rubber plug according to an embodiment of the present invention.

FIG. 4A is a rear view of the pin in the embodiment of the present invention,
(B) is the side view, (c) is the front view.

FIG. 5 is a perspective view showing an external shape of a pin according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a mounted state of the plug according to the embodiment of the present invention.

FIG. 7 is a side sectional view showing the structure of a conventional plug.

[Explanation of symbols]

 1 Brake / Drum 2 Inspection Hole 10 Rubber Plug 10a Recess 10b Through Hole 11 Cylindrical Part 12, 32 Outer Collar Part 13, 33 Inner Collar Part 13a Slit 20 Metal Pin 21, 22 Head 23 Grip Knob 30 Plug

Claims (3)

[Claims] 1. A cylindrical portion circumscribing the inner circumference of the inspection hole, an outer flange portion continuous with the cylindrical portion and in contact with the outer wall of the inspection hole, and a cylindrical portion continuous with the cylindrical portion and in contact with the inner wall of the inspection hole. The rubber plug comprises an inner flange portion and a pin inserted so as to penetrate the inside of the rubber plug along the central axis of the tubular portion, and the rubber plug is outside the inner flange portion without the pin inserted. Inspection hole plug characterized by being formed with a small diameter. 2. The inspection hole plug according to claim 1, wherein the inner flange portion is provided with a plurality of slits along the radial direction from the central axis. 3. The inspection hole plug according to claim 1, wherein a head having a large outer diameter is formed on both ends of the pin, and a grip knob is formed on one of the heads.