JPS5819310B2 - baseball bat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, if the basic tube described in each of the above claims is made larger than the shape of a bat and is compressed into the shape of a bat, it has been experimentally found that the basic tube is cracked or wrinkles are formed;
Since it cannot be used as a bat, to avoid this, a basic tube is formed with an outer diameter and an inner diameter that suit the purpose, and this is swollen or expanded into the shape of a bat using hydraulic pressure, etc. The object of the present invention is to obtain a baseball bat made of a metal having a wood grain and having a uniform thickness, particularly stainless steel, duralumin, etc., and to configure a method for manufacturing the same.

1. of the present invention. is a metal material, especially stainless steel, or
A basic tube formed from a material such as duralumin; the tube is placed in a mold with a butt shape engraved thereon, and hydraulic pressure or other similar pressure is applied to the inside of the basic tube to inflate it into the shape of a butt. The tube openings in the swelling body are each closed with a stopper, and the surface layer of the swelling body is pressed against the mold to express the wood grain in a symmetrical state. It is a baseball bat.

2. of the present invention. A basic tube corresponding to the length of the bat is formed using stainless steel, duralumin, or other metal material that is compatible with the bat material, and this is placed in a mold with the shape of the bat carved into it, and a connecting tool is attached. A pressurized material such as hydraulic pressure, liquid pressure, or steam pressure is fed into the basic pipe through the pipe to cause it to swell into the shape of a bat, and at the time of this swell, the wood grain protrusions built into the above-mentioned mold cause it to swell. This method of manufacturing a baseball bat is characterized in that the surface layer of the body is stamped to form the wood grain in a concave shape, and a stopper is tightly attached to the tube opening of the bulge.

These embodiments are common and will be explained below. In the drawing, 1 is a basic tube made of duralumin,
Usually, the outer diameter is 25 mm, the same diameter is 11 mm,
Or something about 15 mm is better.

In addition, in the case of stainless steel, the inner diameter is 15 mm,
It is better to use one or more.

2 is a mold, which is a mating mold, and 2a indicates the seam.

The shape of the bat is engraved in the mold, but when a part of the bat shape is engraved on each of the mating molds to form the entire mold,
A bat-shaped inner cavity is formed inside it.

3 and 3a are oil feed holes provided in the mold, and 4° and 4a are oil feed pipes connected to them.

Of course, one or both of these oil feed holes will serve as the oil feed hole after the basic pipe 1 is expanded into a bat shape.

It goes without saying that the connection between the oil feed pipes 4, 4a and the basic pipe 1 should be provided with a connector that maintains liquid tightness and is detachable.

(This is omitted and not shown in FIG. 1.

The figure is a schematic diagram.

). The pipe opening of the basic pipe 1 inserted into the mold 2 is the oil feed hole 3.
, 3a, and feed oil into the basic pipe 1 through these oil feed holes, and use the oil pressure to swell the basic pipe 1 to correspond to the butt-shaped inner cavity carved in the mold 2. .

Reference numerals 5 and 5a are plugs that are placed at the opening of the tube after the basic tube 1 has expanded into a bat shape.Usually, a plug made of wood or the like is provided with a gripping groove for fitting (a groove similar to a guide). It is forcefully fitted into the opening by stamping or the like, and the restoring force of the wooden frame is used to naturally expand the part of the clamping groove to fit it tightly into the opening.

Furthermore, wood grains are made to protrude within the mold 2. The method is a general mold making method.

Therefore, the wood grain is carved in the surface layer of the basic pipe 1 in a concave manner.

A lightweight substance may be placed in the swollen basic tube 1 before plugging, but this is usually not necessary.

The bat thus formed has a uniform thickness as a whole.

The basic tube 1 is cut in advance so that the length of the bulge is approximately the desired length of the butt.

In claim 1, the phrase "expressing the wood grain symmetrically" means a recess or a line that does not affect the impression, and recess means a recess. Of course, it also includes articles.

The description of "recessed" in Claim 2 and the other "recessed" in this specification also apply to this.

The bat according to the present invention is used by general means, and when the metal material and thickness are appropriately selected, the bat according to the present invention is lightweight and easy to stamp. Furthermore, the recessed wood grain on the surface prevents the ball from slipping when hitting the bat (generally, with metal bats, the ball tends to slip when hitting the bat).

), even if it is left in the hot sun, the presence of this wood grain will normally have a large heat dissipation area and good heat dissipation during use, and the contact with the palm of the hand will be dispersed during use.
In addition, by reducing the number of bats, it is possible to use it immediately, and even if the wood grain is recessed, the recess was created by embossing during manufacture, so the stress resistance of the bat is weakened. The present invention, which relates to the manufacturing method, has the effect that such a bat can be manufactured easily.

[Brief explanation of the drawing]

The drawings show an example of the baseball bat of the present invention, with FIG. 1 being a diagram showing the manufacturing method thereof, and FIG. 2 being a partially cutaway view showing the baseball bat of the present invention. In addition, an example of the method of manufacturing a baseball bat of the present invention is illustrated, in which FIG. 1 shows a basic tube inserted into a mold, and FIG. 2 shows a method of manufacturing a baseball bat of the present invention. 1 is a diagram showing a product baseball bat manufactured by. In the figure, the main parts exist in a mutually complementary relationship with the matters described in each claim.

Claims (1)

[Claims] 1. As detailed in the main text, a basic tube made of a metal material, particularly stainless steel or duralumin, is placed in a mold in which the shape of a bat is carved, Hydraulic pressure or other similar pressure is applied to the inside of the basic tube to inflate it into the shape of a butt, the tube openings in the inflated body are closed with plugs, and the above-mentioned shape is applied to the surface of the inflated body. A baseball bat characterized in that the wood grain engraved on the mold is expressed in a symmetrical state by pressing with the mold. 2. As detailed in the main text, use stainless steel, duralumin, or other metal materials that are compatible with bat materials.
A basic pipe corresponding to the length of the bat is formed, and this is placed in a mold with the shape of the bat carved into it, and hydraulic pressure, liquid pressure, steam pressure, etc. is applied to the inside of the basic pipe through a connector. A pressurized material is sent in to inflate it into the shape of a bat, and when the inflated body is inflated, the surface layer of the inflated body is embossed with the wood grain protrusions provided in the mold to form a recessed wood grain, and the inflated body A method of manufacturing a baseball bat, comprising tightly attaching a plug to a pipe opening of the baseball bat.