JP3227311B2 - Inspection hole plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as an inspection hole provided on a brake drum wall for inspecting a brake of an automobile and other plugs fitted in the inspection hole. 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 An inspection hole is provided on a brake drum of an automobile so that the condition of an internal brake shoe can be inspected without disassembly. In particular, when adjusting the parking brake, it is used to insert a driver tip into this inspection hole and rotate an internal adjustment screw. As shown in FIG. 7, a rubber plug 30 is fitted into the inspection hole 2 so that water and dust do not enter inside the inspection hole 2 in a normal use state.

[0003]

The brake drum is a member that receives a 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, when trying to pull out this plug 30 at the time of inspection, there is a considerable point and power.

[0004] It is an object of the present invention to provide a plug for an inspection hole which is difficult to be removed during use and easy to be removed during inspection.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a plug which is removed when checking the condition of a brake shoe inside a brake drum and which is inserted after the check to prevent intrusion of muddy water and dust. , A tubular portion circumscribing the inner periphery of the inspection hole, an outer flange portion continuous with the tubular portion and in contact with the outer wall of the inspection hole, and an inner flange portion continuous with the tubular portion and in contact with the inner wall of the inspection hole. And a pin inserted along the center axis of the cylindrical portion so as to penetrate through the inside of the rubber plug, and the outer diameter of the inner flange portion is reduced in a state where the pin is not inserted in the rubber plug. It is characterized by being formed as follows.

The inner flange is provided with a plurality of slits extending radially from the central axis. The pin has a head having a large outer diameter at both ends, and a grip knob on one of the heads. Is preferably formed. Preferably, the pin is made of metal, but plastic, ceramic, or other materials can be used.

[0007]

[Function] When closing the inspection hole, press the inner flange against the inspection hole and push it in. Even if the inner diameter of the inner flange is slightly larger than the inner diameter of the inspection hole, the elasticity of the rubber and the The inner collar part is temporarily deformed by splitting and the brake
It is pushed out into the drum, and the inner flange is released at the position where the outer flange abuts the outer wall of the inspection hole to restore the temporary deformation.

In this state, by inserting the pin into the cylindrical portion, the slit is opened and the inner flange portion expands in the outer peripheral direction, and the rubber plug is fixed to the inner wall surface of the inspection hole. Since the heads larger than the outer diameter of the shaft are formed at both ends of the pin, the heads engage with the side surfaces of the outer and inner flanges and may fall off even when subjected to centrifugal force. Not fixed.

When the inspection hole is opened, the outer periphery of the inner flange portion is restored to its original shape and reduced by pulling it out with the pin gripping knob. If the rubber plug is pulled forward in this state, the inner flange can be easily separated from the inspection hole.

As described above, the plug can be attached and detached by pushing or pulling out the rubber plug and the pin with a small force, and the work time required for the auxiliary work for inspection and adjustment can be shortened. In the mounted state, the inspection hole rubber plug and the pin are engaged with each other with a step, and are in close contact with each other. it can.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing a configuration of a plug according to an embodiment of the present invention, FIG. 2 (a) is a rear view of a rubber plug according to the embodiment of the present invention, (b) is a side sectional view thereof, (c) is a front view thereof,
FIG. 3 is a perspective view showing the external 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 an external shape of a 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, a description will be given assuming that a metal pin is used.

The plug according to the embodiment of the present invention includes a cylindrical portion 11 circumscribing the inner periphery of the inspection hole 2 of the brake drum 1, an outer flange portion 12 continuous with the cylindrical portion 11 and in contact with the outer wall of the inspection hole 2,
A rubber plug 10 comprising an inner flange portion 13 which is continuous with the cylindrical portion 11 and is in contact with the inner wall of the inspection hole 2;
A metal pin 20 inserted through the inside of the rubber plug 10 along the central axis of the rubber plug 1.
0 indicates that the metal pin 20 is not inserted and the inner collar 13
Are formed such that the outer diameter of the becomes smaller.

The inner flange 13 is provided with a plurality of slits 13a extending radially from the central axis.
0, heads 21 and 22 having a large outer diameter are formed at both ends, and a gripping knob 23 is formed on one of the heads 21. The outer diameter of the head 22 is formed slightly smaller than the head 21 in order to facilitate insertion into the cylindrical portion 11 of the rubber plug 10. A recess 10 a having a depth substantially equal to the height of the head 21 of the metal pin 20 is provided on the outer flange portion 12 side of the rubber plug 10.
Is provided, and the through hole 10b is formed by a tapered surface so that the inner diameter decreases toward the inner flange portion 13 side. Further, the outer periphery corresponding to the tapered surface of the cylindrical portion 11 coupled to the inner flange portion 13 has a cylindrical shape 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 peripheral direction. It is formed so that the outer diameter becomes smaller with a taper so as to substantially match the outer diameter of the shape portion 11.

The rubber plug 10 constructed as described above is attached to the center axis of the inspection hole 2 of the brake drum 1 by the rubber plug 10.
The inner diameter of the inner collar portion 13 substantially matches the inner diameter of the inspection hole 2 when the metal pin 20 is not inserted, and the plurality of slits 13
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 surface of the outer flange portion 12 is a wall surface of the brake drum 1. Abut.

In this state, the grip 23 of the metal pin 20 is held.
Is gripped and inserted into the through hole 10b of the rubber plug 10, the outer peripheral surface of the shaft of the metal pin 20 pushes the tapered portion in the through hole 10b in the outer peripheral direction. Along with this, slit 1
3a is opened and the outer diameter of the inner flange portion 13 is increased, and the inner surface thereof is connected to the inner wall surface of the brake drum 1. Thereby, the rubber plug 10 is fixed in a state where the wall surfaces of the brake drum 1 are 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 pushed into the through hole 10b has an outer diameter larger than the outer diameter of the shaft, but the rubber plug 10 is formed of a flexible material. So when pushed in, through hole 1
Ob can be extended and pass through, and after passing through, the rubber plug 10 exerts a force to return to its original shape due to its elasticity, and the through hole 10b and the shaft of the metal pin 20 come into close contact with each other. Furthermore, the inner surface of the head 22 that has passed through the through hole 10b is engaged with the end surface of the rubber plug 10 to prevent the rubber plug 10 from coming off.
The metal pin 20 is fixed without falling off.

Thus, the inspection hole 2 and the rubber plug 10,
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. In addition, since the inspection hole 2, the rubber plug 10 and the metal pin 20 are engaged with each other with a step, they are prevented from falling off even when subjected to a high-speed centrifugal force due to running of the vehicle.

When inspecting the inside of the brake drum 1, if the user holds the grip pin 23 of the metal pin 20 and pulls it out, the head 22 extends through the through hole 10 b of the rubber plug 10 and can be easily removed. . Metal pin 2
When 0 is removed, the through-hole 10b expanded by the shaft of the metal pin 20 returns to its original shape, and the outer diameter of the inner flange 13 decreases with this. If pulled out, the rubber plug 10 can be easily removed from the inspection hole 2. At this time, even if the outer periphery of the inner flange portion 13 may be caught in the inspection hole 2, the rubber plug 10 is flexible and has the slit 13a, so that it can be temporarily deformed and easily extracted. .

In the embodiment of the present invention, the brake drum of an automobile has been described. However, the present invention is not necessarily limited to the brake drum. 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 of the brake drum and the like. When it is fitted, it will be in a sealed state to prevent dust and muddy water from entering,
In addition, it can be prevented from falling off even when subjected to severe vibration. In addition, this makes it possible to reduce the time required for ancillary work such as attaching and detaching a plug for checking or adjusting the inside of the brake shoe and the like.

[Brief description of the drawings]

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

2A is a rear view of the rubber plug according to the 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 external shape of a rubber plug according to the embodiment of the present invention.

FIG. 4A is a rear view of a pin according to an 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 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.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake drum 2 Inspection hole 10 Rubber plug 10a Concave part 10b Through hole 11 Cylindrical part 12, 32 Outer flange part 13, 33 Inner flange part 13a Slit 20 Metal pin 21, 22 Head 23 Grip knob 30 Plug

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 49/00-69/04 F16B 5/06 F16B 19/10

Claims (2)

(57) [Claims] 1. A tubular portion circumscribing the inner periphery of the inspection hole, an outer flange portion continuous with the tubular portion and in contact with the outer wall of the inspection hole, and an inner flange portion continuous with the tubular portion and in contact with the inner wall of the inspection hole. A rubber plug formed of an inner flange portion; and a pin inserted along the center axis of the cylindrical portion so as to penetrate through the inside of the rubber plug. The through hole into which the pin is inserted is formed so as to be tapered so that the diameter becomes smaller toward the inner flange, and the inner flange portion extends radially from the central axis.
A plug for inspection holes, characterized in that a plurality of slits are provided . 2. The pin has a head having a large outer diameter at both ends.
The inspection hole plug according to claim 1, wherein the plug is formed and a grip knob is formed on one of its heads .