JPH08196672A - Joined wood gun and manufacture thereof - Google Patents

Abstract

PURPOSE: To manufacture a joined wood gun joined via a specific joint and having the same strength as that of solid one and save the raw material wood. CONSTITUTION: The barrel 1 and grip 2 of a wood gun are joined via a finger joint 3 having a finger projection. The joining position of the finger joint 3 may be optional in a grip section between a bayonet section mark 4 and the lug 5 of a gunstock section. The joining area corresponds to the area between the grip positions of the right and left hands when the wood gun is gripped at the ready. Shoulder sections 3b of the finger joint 3 are preferably left after the finger joint 3 is finished into a trapezoidal cross-sectional shape for the male/female irregular shape of the finger joint 3. The male/female finger joint 3 is cut-machined on a barrel member and a grip member respectively, an aqueous polyisocyanate adhesive is applied to both joining faces for joining, then finish machining is applied to obtain a joined wood gun.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double grafting gun and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, there is known a two-joint portable wooden gun in which the tip and the rear of the barrel are detachable via a sleeve (connection short pipe) for the purpose of easy carrying. (Kaisho 56-138669). With this portable wood gun,
The two barrels are fixed by the engagement of the spherical projection urged by the striation and the engagement hole of the connecting short tube. By pushing the spherical protrusion against the bias of the spring when carrying it, it is disassembled into two.

However, with a structure in which the engagement can be released by pushing it in, there is a danger in vigorous practice of bayonet. Further, the material of the connecting short pipe is considered to be made of metal in view of the fixing strength, but the structure where the metal is exposed to the outside may damage the body during practice.

[0004] Generally, when practicing bayonet, a wooden gun is momentarily subjected to a strong force in the longitudinal direction, so that it is manufactured from a single plate of oak grain. However, the length of the wood gun is about 1600
It has a width of 1700 mm and a width of 110 to 160 mm, and in order to obtain a single long grain of this grain, an oak log is 70 years old.
It must have been more than a year old, and its acquisition has become extremely difficult in recent years. Nevertheless, strict specifications are required from the viewpoint of user safety, and there is still no practical alternative.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above problems, and an object of the present invention is to provide a double-joined wood gun that can be safely used just like a normal single wood gun. I am trying.

[0006]

Means for Solving the Problems The present inventor has made various studies in order to achieve the above-mentioned object. As a result, a combination of a finger joint of a particular shape and a chemical adhesive is selected from among many woodworking joints. It has been found that it is suitable for joining wood guns. As a result of further studies, the two-piece graft gun of the present invention and its manufacturing method were finally completed.

That is, the present invention is as follows. 1. The fact that the barrel (1) and the barrel (2) are joined by a finger joint (3) via an adhesive at any position of the barrel portion from the bayonet part mark (4) to the butt part protrusion (5) A characteristic two-piece grafting gun. 2. The two pieces according to the above item 1, wherein the concavo-convex portion of the finger joint (3) has a trapezoidal cross section and has a joint shoulder portion (3b), and the adhesive does not visually remain as a layer on the joint surface. Grafting gun. 3. The double grafting gun according to the above item 1, wherein the adhesive is an aqueous polyisocyanate adhesive. 4. The barrel member (1a) and the gun grip member (2a) are modeled from oak perforated plate material of an arbitrary thickness, and a trapezoidal convex section of the finger joint (3) is provided on one of them, and a trapezoidal concave section corresponding to the other is provided. And a water-based polyisocyanate adhesive is applied to the joint surfaces to join the joint surfaces, and then finishing is performed so as to leave the joint shoulder portion (3b).

In the present invention, the barrel means a member integrally formed from the bayonet portion and the grip portion shown in FIG. 1 to the joint position, and the gun barrel means the joint portion from the gun grip portion joint position to the stock portion integrally. Means a member.

The two-piece graft gun of the present invention is characterized in that the barrel and the gun barrel are joined by a finger joint via an adhesive at an arbitrary position of the gun barrel portion from the bayonet portion mark to the butt portion projection portion. . The concavo-convex portion of the finger joint preferably has a trapezoidal cross section and a joint shoulder, and it is desirable that the adhesive does not visually remain as a layer on the joint surface. A water-based polyisocyanate adhesive is preferable as the adhesive because it has excellent affinity with wood and does not leave an adhesive layer.
Further, the position of the joint portion should be substantially within the grasping position of the left and right hands when the user holds it.

Further, in the method of manufacturing a two-piece grafting gun of the present invention, the barrel member and the gun holding member are molded from separate oak plate materials, and one of them corresponds to the trapezoidal convex section of the finger joint and the other corresponds to the other. It is characterized in that a trapezoidal recess having a cross section is processed, a water-based polyisocyanate adhesive is applied to the bonding surface to bond, and then the joint shoulder is finished.

[0011]

In the wood gun of the present invention, the barrel is joined at any position, so that even the barrel can be removed from the oak perforated plate material having a length of about 1200 mm, and a barrel of about 1000 mm is sufficient. In addition to the selection of the joint position, a special finger joint structure and a chemical adhesive are used in combination, so that the barrel can be used like a normal wood gun without the risk of breaking at the joint. In the manufacturing process, the barrel and gun barrel are joined at the stage of the original material, and then finish processing is performed, so that an appearance similar to that of a single wooden gun can be obtained.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing an example of a double grafting gun of the present invention. In FIG. 1, both a barrel 1 and a barrel 2 of a wood gun are made of oak and are joined by a finger joint 3 having one finger projection.

If the joint portion of the finger joint 3 is in the grip portion between the bayonet mark 4 and the projection 5 of the stock,
It may be at any position. This joining area corresponds to the grasping position of the left and right hands when grasping with a wood gun. It is desirable that the finger joint 3 is located closer to the bayonet part because a longer raw material plate is not required, but it is not preferable in terms of strength to exceed the position of the left hand of a right-handed user.

FIG. 2 is an enlarged plan view showing details of the finger joint of FIG. As for the male and female uneven shape of the finger joint 3, as shown in FIG. 2, a trapezoid having a long side W1 and a short side W2 in the cross section of the male convex portion has good workability and stability. The top 3a forming the short side W2 may be sharp, but this is not desirable in processing the tip. Long side W
When 1 is equal to the width W, both sides on the concave side of the female side may be sharpened and thinned, so that the shoulder 3b ((W-W1) / 2) of the joint is preferably left after finishing.

The length L of the finger joint 3 in the longitudinal direction is preferably long in terms of increasing the contact area, but is practically about 50 to 65 mm in terms of processing. Further, the height in the vertical direction is such that the male convex portion reaches the upper and lower portions of the joint portion, and it is not preferable that the female thick portion is on the entire circumference of the male convex portion like dowel joint or tenon joint. That is, in the vertical finger joint, the female-side thick portion is on both sides as shown in FIG. 4C, but not on the upper and lower sides.

In the present embodiment, the vertical finger joint is shown, but it is also possible to rotate it by 90 ° so that it is in the horizontal direction, and the male and female can be reversed so that the barrel is male and the barrel is female. May be.

The double grafting gun of the present invention constructed as described above is manufactured as follows. Length 1050-1060
A barrel member 1a as shown in FIG. 3A is shaped from an oak plate having a width of 47 mm, a width of 47 to 32 mm, and a thickness of 33 to 30 mm. Also, the length is 645 to 660 mm and the width is 160 to 110.
The gun grip member 2a is shaped from an oak plate having a thickness of 33 mm and a thickness of 33 to 30 mm. The size of the barrel member 1a is width 47 × thickness 3
It is a square bar having a length of 3 × 1050 mm. The size of the gun handle 2a is 160 m wide and 33 m thick at the end of the stock.
m, the width of the joint portion is 47 mm, the thickness is 33 mm, and the length is about 660 mm.

A male and female finger joint 3 is cut into each of these members, and an aqueous polyisocyanate adhesive is applied to both joint surfaces, for example, "Shika Mark BI Eye Bond 127" (trade name) manufactured by Oshika Shinko Co., Ltd. Apply. Next, the barrel member 1a and the barrel member 2a are fitted and adhered to each other so that their upper surfaces are smooth, as shown in FIG.
FIG. 3B is an upper elevation side view. The tight fit pushes the excess adhesive from the top and bottom surfaces of the joint and the rest is absorbed by the wood so that no adhesive layer remains visible. If the adhesive layer remains, it is likely to deteriorate, and the durability of the bonded portion will deteriorate.

After this intermediate joining member was left standing until the joining was fixed, the joining portion was changed to one shown in FIGS. 4 (a), 4 (b) and 4 (c).
Obtain a wood gun by finishing it into a substantially elliptical shape until it has the shape shown in. With the wood gun obtained in this way,
During use, the bayonet part was never broken from the joint before it was broken.

[0021]

The advantages of the two-piece grafting gun of the present invention and the manufacturing method thereof are as follows, and can be used in the same manner as a normal one-piece woodgun. By using a finger joint and a chemical adhesive together for joining and specifying the joining position in the gun grip, the strength equivalent to that of one piece was obtained. As a result, the raw material plate used can be about half the size of the conventional one, making it easy to obtain raw wood and save costs and resources. By performing the joining with the intermediate member, the finish of the joined portion was good and it was indistinguishable from one piece.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a double grafting gun of the present invention.

FIG. 2 is an enlarged plan view showing details of the finger joint of FIG.

3A and 3B are views showing a finger joint joint portion of a barrel member and a gun grip member in the manufacturing process of the present invention, in which (A) is a side view and (B) is an elevation perspective view.

FIG. 4 shows a finger joint joint portion after finishing processing in the manufacturing process, in which (a) is a side view and (b) is
Is a plan view, and (c) is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Barrel 1a Barrel member 2 Gun grip 2a Gun grip member 3 Finger joint 3a Joint top 3b Joint shoulder 4 Bayonet mark 5 Gun stock protrusion

Claims (4)

[Claims] 1. A bayonet mark (4) to a butt section protrusion (5)
A two-piece grafting gun, characterized in that the barrel (1) and the barrel (2) are joined by a finger joint (3) with an adhesive at any position up to the barrel portion. 2. The finger joint (3) is characterized in that the concavo-convex portion is trapezoidal in cross section and has a joint shoulder portion (3b), and the adhesive does not visually remain as a layer on the joint surface. The two-piece graft gun described in 1. 3. The double grafting gun according to claim 1, wherein the adhesive is an aqueous polyisocyanate adhesive. 4. A barrel member (1a) and a gun grip member (2a) are modeled from oak perforated plate material of an arbitrary thickness, and a trapezoidal convex portion of a cross section of a finger joint (3) is provided on one of them.
A two-piece grafting gun, characterized in that a trapezoidal cross-section concave portion corresponding to the other is provided, an aqueous polyisocyanate adhesive is applied to the joining surface to join, and then finish processing is performed to leave the joint shoulder portion (3b). How to make.