JPH05169902A - Flap blowing-out preventing jig - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the flap from blowing out from the valve hole of the rim without impairing the workability when incorporating the flap into the tire. [Structure] An annular portion 1 attached to a valve hole of a flap 4 and a plate-like portion 2 covering a valve hole 5 of a rim, and one end of the plate-like portion 2 has a rim contact side flange 1 of the annular portion 1.
engaged with b. In addition, this plate-like portion 2 is provided with a flap 4
When the tire is assembled into the tire, the plate-like portion 2 is arranged along the circumferential direction of the flap, and when the tire is assembled to the rim, the plate-like portion 2 covers at least the valve hole 5 of the rim so as to cover at least the flap circumferential direction. To 90 ° in the width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for preventing a flap for a tire from blowing out from a valve hole of a rim.

[0002]

2. Description of the Related Art It is widely known that flaps are used to prevent damage to tire tubes. By the way, in the tire using the flap as described above, there is a problem that the flap blows out from the valve hole of the rim. This is caused by the fact that the valve hole of the rim is formed to be considerably wider than the valve diameter, so that the flap is pushed out by the internal pressure of the tube and tries to blow out from the valve hole of the rim. In order to prevent such blowout, conventionally, the periphery of the valve hole of the flap has been made thick or reinforced by stretching a canvas.

[0003]

However, it is difficult to say that these blow-out preventing means can effectively suppress the blow-out of the flap, and since the flap valve hole periphery is thick and hard, it is difficult to install it in a tire. There is a problem in that workability is reduced because it requires a very large force. Therefore, an object of the present invention is to install the tire in a
It is an object of the present invention to provide a flap blowout preventing jig capable of effectively preventing flap blowout without impairing workability.

[0004]

A blowout preventing jig of the present invention comprises an annular portion attached to a valve hole of a flap,
It consists of a plate-shaped part that is large enough to cover most of the valve hole of the rim. One end of the plate-shaped portion is engaged with the rim contact side flange of the annular portion, and is rotatable at least within a range of 90 ° from the flap circumferential direction to the width direction. Is.

[0005]

When the flap to which the blow-out prevention jig of the present invention is attached is incorporated into the tire, the periphery of the valve hole of the flap itself is not thick, so that a particularly large force is not required and workability is hindered. It will never come. or,
Since the plate-shaped portion can rotate, the plate-shaped portion does not hinder the assembling work by aligning the longitudinal direction of the plate-shaped portion with the circumferential direction of the flap when the plate-shaped portion is assembled.

On the other hand, when the tire is assembled on the rim, it is handled as follows. Normally, the valve hole of the rim is formed as an elongated hole extending in the width direction of the rim (width direction of the flap) so that the valve can be easily inserted. Further, as for the relationship between the valve and the valve hole of the rim, as shown in FIG. 1, the valve is inserted through the center of the rim and is located at one end of the valve hole of the rim. Therefore, the plate-shaped portion is rotated so that its longitudinal direction is along the width direction of the flap. Then, the plate-shaped portion is positioned so as to cover most of the valve holes of the rim. At this time, the plate-shaped portion is pressed against the rim due to the pressing of the flap by the tube internal pressure, and it is possible to prevent the flap from blowing out from the valve hole without being easily displaced.

Further, since the jig of the present invention is directly fixed to the flap by the annular portion, it is not inadvertently dropped into the tire when the flap is attached to the tire. Further, the tube side flange of the annular portion is protected by the valve washer 7 (see FIG. 1 (B)),
There is no risk of damaging the tube.

It is sufficient that the engaging groove is provided within a range of about 90 ° so that the plate portion can rotate in the same width direction from the flap circumferential direction, but it may be formed over the entire circumference. .. Also, there are various sizes of valve holes on the rim, but the size of the plate-like portion that covers them is small and the length is 2 mm.
It is generally 5 mm, width 14 mm, and a large one having a length of 110 mm and a width of about 30 mm. Further, the flange width a on the rim contact side (see FIG. 2A) is 5 mm to 1
It is about 5 mm. If it is too small, the plate-like portion cannot be sufficiently engaged, and if it is too large, the workability in assembling the flap into the tire becomes poor.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 (A) is a plan view of a state in which the jig of the present invention closes the valve hole of the rim as seen from the valve hole side of the rim, and FIG. 1 (B) is an enlarged cross-sectional view around the valve insertion hole.
As shown in FIG. 1, the jig of the present invention comprises an annular portion 1 attached to the valve hole of the flap 4 and a plate-like portion 2 engaged with the annular portion 1.

First, the annular portion 1 will be described with reference to FIG.
FIG. 3A is a plan view of the annular portion viewed from the rim contact side,
(B) is a sectional view in the xy direction in (A). As shown in the drawing, the annular portion 1 is attached to both the tube side and the rim contact side flanges 1a so as to be attached to the valve hole of the flap.
It is an annular one with 1b. The rim contact side flange 1b of the annular portion 1 is provided with an engagement groove 3. This is for engaging the plate-like portion 2 described later,
The plate-shaped portion is provided concentrically with the valve insertion hole 5 so as to be rotatable in the same width direction from the flap circumferential direction (see FIG. A). Further, the cross-sectional shape of the groove 3 is T-shaped as shown in FIG. 3B, and the rim contact side is narrow and the flap side is wide.

Next, the plate portion 2 will be described with reference to FIG. FIG. 3A is a side view of the plate-shaped portion, and FIG. The plate-shaped portion 2 is a plate-shaped portion that can cover most of the valve hole of the rim, and has a T-shaped protrusion 2a at one end thereof.
The T-shaped protrusion 2a is of a size that can be inserted into and engaged with the engagement groove 3, and its height is substantially equal to the thickness of the rim contact side flange 1b.

[0012] Then, such an annular portion 1 and a plate-like portion 2
Is engaged as follows. First, the longitudinal direction of the T-shaped protrusion 2 a is aligned with the longitudinal (circumferential) direction of the engagement groove 3, and the T-shaped protrusion 2 a is inserted into the engagement groove 3 from the rim contact side. Then, the annular portion 1 or the plate-shaped portion 2 is rotated so that the center line in the longitudinal direction of the plate-shaped portion 2 faces the center of the annular portion, and both are engaged. Thereby, if the plate-shaped portion 2 is slid along the engagement groove 3,
The flap can be rotated in the same width direction from the circumferential direction of the flap about the center of the annular portion.

The jig described above was attached to the valve hole of the flap, and the flap was actually incorporated into the tire.
In this case, it was confirmed that the flap bending can be relatively easily performed by aligning the longitudinal direction of the plate-shaped portion with the flap circumferential direction, which does not hinder the assembling work. Moreover, when assembling the tire on the rim, it was confirmed that the valve hole of the rim can be covered by aligning the longitudinal direction of the plate-like portion with the flap width direction, which is effective in preventing the blowout of the flap.

[0014]

As described above, the jig of the present invention has the following effects. Since the flap is not thick around the valve hole, a large force is not required to bend the flap, and workability when incorporating the flap into a tire is not hindered. When installing the flap into the tire, rotate the plate-shaped part,
By aligning the longitudinal direction with the circumferential direction of the flap, the plate-shaped portion does not hinder the assembling work. When assembling the tire on the rim, rotate the plate-shaped part,
By arranging the longitudinal direction thereof along the width direction of the flap, the plate portion can cover most of the valve hole of the rim. As a result, it is possible to effectively prevent the flap from blowing out from the valve hole of the rim and the accompanying deformation of the valve hole of the flap. Since the jig of the present invention is directly fixed to the flap by the annular portion, it is not inadvertently dropped into the tire when the flap is attached to the tire. The tube side flange of the annular portion is protected by the washer of the valve, so there is no risk of damaging the tube.

[Brief description of drawings]

FIG. 1A is an explanatory view showing a state in which a jig of the present invention closes a valve hole of a rim, and FIG. 1B is an enlarged sectional view around a valve insertion hole.

FIG. 2A is a plan view of an annular portion as seen from a rim contact side,
(B) is a cross-sectional view taken along the line (A) in FIG.

FIG. 3A is a side view of the plate-shaped portion, and FIG.

[Explanation of symbols]

 1 Annular part 1a Tube side flange 1b Rim contact side flange 2 Plate part 2a T-shaped projection 3 Engagement groove 4 Flap 5 Valve insertion hole 6 Rim valve hole 7 Valve washer

Claims (1)

[Claims] 1. A ring-shaped portion attached to a valve hole of a flap, and a plate-shaped portion covering most of the valve hole of a rim,
One end of the plate-like portion is engaged with the rim contact side flange of the annular portion, and is configured to be rotatable at least within a range of 90 ° from the flap circumferential direction to the width direction. Prevention jig.