JPH0533170Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention consists of a combination of two parts, a front part and a rear part, and the two parts are joined to form an integrated main body, which improves dimensional stability. The present invention relates to a dowel rod made of a tubular body made of a fiber-reinforced resin composite material, which is lightweight and durable, has appropriate rigidity as a dowel rod, and is comfortable to use.

(Prior art and problems) Conventional dowel rods with wooden main bodies (hereinafter referred to as "conventional products") tend to develop vertical cracks during repeated use, and are therefore not suitable for long-term use. The problem was that I couldn't stand it. This is because when the main body is made of wood, if the ball is hit hard upon impact, the strength in the direction perpendicular to the axial direction is insufficient, and this has a large effect on the durability of the ball.

Furthermore, because conventional products are susceptible to the effects of temperature and humidity due to their nature, they are prone to deformation such as bending and twisting, and as a result, they have the problem of not being able to withstand use as a dowel rod. .

In order to solve the above problems, the inventor
After much intensive research, we have completed this invention.

(Purpose, structure, and effect of the idea) The present invention consists of the following configuration.

In a dowel rod main body formed by combining two parts, a front part and a rear part, and joining the two parts and integrating them, the first part is made of glass fiber reinforced resin composite material, and the inner layer of the latter part is made of carbon fiber reinforced resin composite material. , a tubular dowel rod whose outer layer is made of a glass fiber reinforced resin composite material.

The present invention uses fiber-reinforced resin composite material for the main body of the billiards stick, which is more durable than conventional products.
To provide a billiard stick which is excellent in dimensional stability, lightweight and durable, and further has rigidity comparable to that of conventional billiard sticks, and hence is easy to control the balls and has an excellent usability.

More specifically, the first half is made only of glass fiber reinforced composite material, and the second half has an outer layer made of glass fiber reinforced composite material (hereinafter referred to as "GFRP layer") and an inner layer made of carbon fiber reinforced composite material (hereinafter referred to as "CFRP layer"). ), it is possible to obtain rigidity comparable to conventional products, adjust the weight and balance of the dowel rod, and further reduce costs.

In addition, the dowel rod of the present invention is not affected by environmental conditions such as temperature and humidity, so the main body does not bend, twist, or otherwise deform.
Since it has a structure that is reinforced both in the vertical direction and the axial direction, it has the advantage that it does not crack and can be used in a stable state for a long period of time.

Further, the main body portion may just be a tubular body, and the first half and the second half do not necessarily need to have the same shape (presence or absence of a taper, difference in tube diameter, etc.).

An example of the present invention will be explained with reference to the drawings.

FIG. 1 is an overall view of the dowel rod, FIG. 2 is a cross-sectional view taken along the line AA' in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B' in FIG.

In the figure, 1 is the front half of the main body, 2 is the rear half of the main body,
3 is tap, 4 is stone, 5 is GFRP layer, 6 is
Shows the CFRP layer.

The first half and the second half are generally joined using a metal joint. In addition, the dowel rod can be divided into a front half and a back half at the joint when being carried around.

Next, in the fiber-reinforced resin composite material, as a reinforcing material, a fiber structure material such as a unidirectionally aligned array, a woven fabric, or a braid can be used for either carbon fiber or glass fiber. Further, as the matrix resin used, thermosetting resins, particularly epoxy resins, unsaturated polyester resins, etc. are preferable.

The ball stick that is proposed in this invention has a GFRP layer in the first half,
The latter half is a combination of an inner layer of CFRP and an outer layer of GFRP. By using these fiber-reinforced resin composite materials, the first half has a rigidity comparable to conventional products, and the second half can easily control the ball by adjusting the weight and balance of the ball. A dowel rod with excellent usability can be obtained, and the cost can be reduced.

In addition, the dowel rod of the present invention is not affected by environmental conditions such as temperature and humidity, so the main body does not bend, twist, or otherwise deform.
In the GFRP layer used as the outer layer of the front and rear parts of the main body part, the fiber structure material is arranged in the axial direction (including the state inclined to the axial direction) with respect to the tubular body, orthogonal to or oblique to this. By intersecting the structure, it is possible to prevent the main body portion from cracking, which has the advantage that it can be used in a stable state for a long period of time.

As the composite material in the present invention, it is common to use a so-called prepreg in which a fiber structural material made of carbon fiber or glass fiber used as a reinforcing material is impregnated with a matrix resin in advance.
The glass fiber used for this may be any ordinary commercially available product, but the carbon fiber should be at least 16 tons/kg.
It is preferable to use a material with an elastic modulus of mm ² or more. Further, as the matrix resin, thermosetting resins, particularly epoxy resins and unsaturated polyester resins are preferable.

Next, the present invention will be specifically explained using examples.

A common method for forming the main body (first half and second half) of a dowel rod into a tubular body is to use a steel core (mandrel). A mold release agent is applied to this mandrel, and after drying, a tacking resin is further applied and then dried. The diameter of the mandrel is
The first half had a minimum diameter of 9 mmφ and the maximum diameter was 17 mmφ, and the second half had a minimum diameter of 17 mmφ and a maximum diameter of 28 mmφ.

The mandrel is made of prepreg using glass fiber fabric as the fiber structure material and epoxy resin as the matrix resin.
1.5 mm, maximum thickness of 2 mm, the inner layer is carbon fiber fabric as the fiber structure material, and the matrix resin is epoxy resin wrapped in a thickness of 0.5 mm, and the outer layer is In this method, a prepreg using glass fiber fabric as the fiber structure material and epoxy resin as the matrix resin was wrapped to a thickness of 1.5 mm, then wrapped with tape, and the epoxy resin was heated at 135°C for 90 minutes. A hardening process was performed. After heat curing, the mandrel was removed from the cured product, the wrapping tape was removed, and centerless polishing was performed to make the surface smooth, followed by matte coating. In this case, the front half must be finished with a paint finish that makes it especially easy for fingers to slide on.

A conventionally used leather tap is glued to the tip of the front half of the main body, and a steel joint is inserted and glued to the joint between the front half and the back half. Rubber, which has traditionally been used, was glued to the stone butt.

As mentioned above, by using the fiber-reinforced resin composite material, the coin rod according to the present invention is lighter and more durable than conventional products. It is a ball stick that is easy to use and easy to use because it has a rigidity comparable to that of other products.

In addition, since the dowel rod of the present invention is not affected by environmental conditions such as temperature and humidity, the main body part does not bend, twist, or otherwise deform.
As mentioned above, since it does not crack, it is a useful dowel rod that has good dimensional stability, is lightweight, has excellent durability, and can be used stably for a long period of time.

[Brief explanation of the drawing]

1 is an overall view of the dowel rod, FIG. 2 is a sectional view taken along the line AA' in FIG. 1, and FIG. 3 is a sectional view taken along the line BB' in FIG.

Claims (1)

[Scope of utility model registration request] In a dowel rod main body formed by combining two parts, a front part and a rear part, and joining the two parts and integrating them, the first part is made of glass fiber reinforced resin composite material, and the inner layer of the latter part is made of carbon fiber reinforced resin composite material. , a tubular dowel rod whose outer layer is made of a glass fiber reinforced resin composite material.