JP2002046435A - Valve core rotating jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve core rotating jig capable of being turned easily and generating a sufficient torque. SOLUTION: This valve core rotating jig comprises a handle part, a shank part having a notch installed at the tip thereof, and a triangular neck part extending from the handle part and having a width decreasing from the width W1 of the handle part to the width W2 of the shank part. The parts are formed integral with each other by using a synthetic resin. The jig is formed of a flat plate having a thickness T of 3 to 8 mm, the width W1 of the handle part of 10 to 20 mm, and the length of the handle part L of 20 to 50 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for turning a valve core used for attaching and detaching a valve core from an air valve of an automobile tire.

[0002]

2. Description of the Related Art In replacing a tire, a tire is removed from a wheel rim after removing a valve core from an air valve to release internal air. And after assembling another tire for replacement to this wheel rim, inserting the valve core into the air valve,
This is done by refilling with air.

At this time, the removal of the valve core from the air valve usually requires a torque of 20 to 30 N · cm. Therefore, as shown in FIG. A dedicated turning jig A1 is widely used which is provided with an elongated metal shank c having a notch b at the tip formed on a handle-shaped handle portion a.

[0004] However, these are problematic in that they are large in size, heavy and inconvenient to carry, and high in manufacturing cost. Therefore, in recent years, as shown in FIG.
A jig A2 in which the handle a and the short shank b are integrally formed of synthetic resin has also been proposed. Note that the numbers in the figure show examples of actual dimensions. Although this is small, lightweight and low cost, the shank c is short and the handle a is close to the wheel rim, so it is difficult to turn and it is difficult to apply force. It cannot be removed without fail.

Accordingly, the present invention is based on the fact that the handle portion is formed in a flat plate shape having a predetermined dimension, and it is easy to rotate and can generate a sufficient torque, and the advantages of the small size, light weight and low cost are secured. An object of the present invention is to provide a jig for turning a valve core, which can reliably remove the valve core while ensuring the removal.

[0006]

In order to achieve the above object, the present invention provides a handle portion, a shank portion provided with a notch at a tip for engaging with a valve core, and a handle extending from the handle portion. And has a triangular neck portion reduced from the width W1 of the shank portion to the width W2 of the shank portion and is integrally formed of synthetic resin, the thickness T is 3 to 8 mm, and the width W1 of the handle portion is 10 to 20 mm. The length L of the handle portion is a flat plate having a length of 20 to 50 mm.

In the invention of claim 2, the shank portion is formed by cutting the notch into a U-shape which is open frontward in the thickness direction on the longitudinal center line of the handle portion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described.
This will be described together with the illustrated example. FIG. 1 is a perspective view showing a turning jig of a valve core according to the present invention, and FIG. 2 is a diagram illustrating a use state thereof. In FIG. 1, a turning jig 1 for a valve core is shown.
(Hereinafter referred to as a turning jig 1) includes a handle portion 2, a shank portion 4 provided with a notch 3 at a distal end for engaging with the valve core 20, and a shank from the handle portion 2 having a width W 1. It has a triangular neck portion 5 reduced to the width W2 of the portion 4 and is integrally formed of synthetic resin.

Here, the valve core 20 has a well-known structure defined by standards such as JIS, and is removably fitted into a valve body 21 to be mounted on a wheel rim. At the tip of the head 20A of the valve core 20, a rectangular engaging projection 22 that engages with the turning jig 1 protrudes. The engaging projection 22 has a pair of parallel engaging surfaces 22S formed by milling both sides of the head 20A.
The width WA between 2S is generally set to about 2.0 mm.

The turning jig 1 has a thickness T of 3 to 3.
It is made of a flat plate-like body having a thickness of about 8 mm, and the handle portion 2 has a width W1 of 10 to 20.
mm and the length L of the handle portion 2 is set to 20 to 50 mm.

The shank portion 4 extends through the neck portion 5 with a small length, and its width W2 is equal to the valve body 21.
Is smaller than the inner diameter DA, and the present example illustrates a preferred case where the inner diameter is equal to or greater than the thickness T.

The notch 3 is a front open U-shaped groove formed by cutting off the tip portion of the shank portion 4 in the thickness direction on the longitudinal center line K of the handle portion 2, As in the conventional case, the valve body 20 can be engaged with the engaging protrusion 22 by sandwiching the engaging protrusion 22.
Can be rotated.

As described above, since the turning jig 1 is formed in a flat plate shape, the handle portion 2 can be firmly held between the thumb and the index finger as shown in FIG. In addition, since a large distance L1 from the longitudinal center line K, that is, the center of rotation can be ensured, it is easy to turn and a large torque can be efficiently generated with a small force.
Therefore, even when the shank portion 4 is short and close to the wheel rim, the valve core 20 can be easily and easily removed.

When the width W1 is less than 10.0 mm,
When the distance L1 from the center of rotation is too small, the torque generation efficiency is reduced. When the length L is less than 20.0 mm, the finger cannot be firmly pinched and cannot generate sufficient torque. . If the thickness T is less than 3.0 mm, the strength will be insufficient.

Conversely, the width W1 is larger than 20.0 mm;
Length L is greater than 50.0 mm, and thickness T is 8.0 mm
Larger sizes are unnecessarily too large, small,
It is disadvantageous for light weight and low cost. Therefore, the width W1, the length L, and the thickness T are preferably 13 to 17 m, respectively.
m, 25 to 35 mm, and 4 to 6 mm are desirable.

In order to reduce the size and weight, as shown in this example,
The lengths L2 and L3 of the shank portion 4 and the neck portion 5 are preferably set to 8 to 12 mm and 8 to 12 mm, respectively.

The synthetic resin forming the turning jig 1 is not particularly limited. For example, a thermoplastic resin such as an ABS resin, an acrylic resin, or a polycarbonate resin can be suitably used. Since it has excellent impact resistance, is inexpensive, and has good workability, it can be more preferably employed. For reinforcement, a reinforcing material such as short fibers can be contained.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment, but may be implemented in various forms.

[0019]

EXAMPLE A turning jig having the structure shown in FIG. 1 was formed according to the specifications shown in Table 1, and the generated torque at that time was measured.

The generated torque was operated by ten men and women, and the maximum torque generated by each turning jig was measured using a torque meter, and the range of the measured value at that time was defined as the generated torque.

[0021]

[Table 1]

As shown in the table, the turning jig of the embodiment is 30 to 6
It can be confirmed that a torque of 0 N · cm can be generated and the valve core can be easily removed.

[0023]

As described above, according to the present invention, since the handle portion is formed in a flat plate shape having a predetermined dimension, the handle portion can be easily turned and sufficient torque can be generated, and the advantages of small size, light weight, and low cost can be obtained. , The valve core can be reliably removed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a turning jig according to an embodiment of the present invention.

FIG. 2 is a diagram showing the method of use.

FIGS. 3A and 3B are front views showing a conventional turning jig.

[Explanation of symbols]

 2 Handle part 3 Notch 4 Shank part 5 Neck 20 Valve core K Longitudinal center line

Claims (2)

[Claims] 1. A handle portion, a shank portion provided with a notch at a tip for engaging with a valve core, and a triangular neck portion extending from the handle portion and reducing a width W1 of the handle portion to a width W2 of the shank portion. The thickness T is 3 to 8 mm, and the handle portion has a width W1 of 1
A turning jig for a valve core, which has a flat plate shape having a length of 0 to 20 mm and a handle portion having a length L of 20 to 50 mm. 2. The shank portion is formed by cutting the notch into a U-shape which is open frontward in a thickness direction on a longitudinal center line of the handle portion.
A turning jig for the described valve core.