JPS593610B2 - Wood joining method and joining tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for joining wood.

Conventionally, in order to join two pieces of wood, male and female dovetail grooves that fit into each other are formed on the joining surfaces of each piece of wood, and these are then fitted together.

However, it is difficult to form the engaging portion, especially the female dovetail groove, by mechanical work, and in the end the work must be done manually using the buttocks, which has the disadvantage of being extremely inefficient. The joining by the retaining part merely prevents the two pieces of wood from coming apart, and the tensile strength is at most 400.
There is a small drawback.

The present invention eliminates the above-mentioned drawbacks and provides a method for joining two pieces of wood with extremely high strength through simple work, and a joining device used therefor.

An example of implementing the present invention will be described below with reference to the drawings.

In the present invention, a joining tool 1 made of iron, for example, as shown in FIGS. 1 and 2 is used.

This connector 1 has leg portions 3, 3 integrally formed at both ends of an intermediate connecting portion 2 so as to project to one side and form a U-shape together with the leg portions 3, 3, which are inclined outward at a small opening angle. and configure it.

In the illustrated example of the connector 1, the intermediate connecting portion 2 is in the form of a strip with a rectangular cross section, and the leg portions 3, 3 are in the shape of a round bar with a circular cross section.

- As shown in Figures 3 and 4, the wood 4 to be joined
.

That is, holes 5, 5 for press-fitting the leg portions 3, 3 into the wood 4, 4 from the upper surface thereof are formed in the intermediate connecting portion 2 of the connector 1.
are spaced apart equal to the length of .

Further, in order to make these holes 5, 5 communicate with each other at the upper part thereof, a groove 6 having a width matching the thickness of the connecting part 2 and a depth matching the height is formed along a plane perpendicular to the joining surface. It is formed over both pieces of wood 4,4.

These holes 5, 5 each have a larger diameter and a slightly larger depth than said leg parts 3, 3, and extend downwardly with each other at an outward slope, and each hole 5, 5 extends downwardly from said groove 6. The distance between the closest points between the parts located on the bottom surface of the leg portions 3, 3 is slightly smaller than the distance d between the closest points between the leg portions 3, 3, and the opening angle (2β) of each hole 5, The opening angle (2α) of portions 3 and 3 is slightly larger [straight].

In the present invention, the tips of both leg portions 3, 3 of the joint tool 1 are made to face the holes 5, 5 of the wood pieces 4, 4, respectively, or the tips are inserted into the holes 5, 5.

In this state, as shown in FIG. 5, since the inclination angle of the leg parts 3, 3 is smaller than the inclination angle of the corresponding holes 5, 5, the closest point between the tips of the leg parts 3, 3 is the hole 5.
, 5 come into contact with the inner circumferential surface portion closest to each other.

Here, the leg portions 3, 3 of the joining tool 1 are hammered into the holes 5, 5 by being hammered, thereby joining the pieces of wood 4, 4 together.

Since the present invention is as described above, the opening angle of the clearance holes 5, 5 in which the leg portions 3, 3 of the connector 1 are press-fitted into the holes 5, 5 as shown in FIG. Since the opening angle is slightly wider than the opening angle of hole 3, as the leg portions 3, 3 move downward, the mutually opposing portions of their outer circumferential surfaces gradually bite into the mutually approaching portions of the inner circumferential surfaces of both holes 5, 5. Thus, the pieces of wood 4,4 are joined together under a force in the direction of approaching each other as shown by the arrows.

Moreover, since this force is maximum at the tip of the leg parts 3, 3, the pieces of wood 4, 4 are not only joined on their surfaces, but also inside them, with a stronger force.
As a result, a tensile strength as large as 1000 kv'crA can be obtained between the timbers 4, 4.

In addition, the connecting portion 2 of the connector 1 is positioned in the groove 6 extending across the timbers 4, 4, so that the upper surfaces of the timbers 4, 4 can be made flat without any protruding parts. This connecting portion 2 fitted into the groove 6 allows both timbers 4,
4 can be prevented from relative sliding position shift in the vertical direction.

Further, since each of the holes 5, 5 is a simple straight hole, they can be formed very easily by a conventional method, and in this case, of course, machining can also be used.

Moreover, the joining operation is simple and can be accomplished extremely efficiently.

The connector 1 may be made by various means such as forging or welding.

An example of the opening angles of the leg portions 3, 3 and the opening angles of the holes 5, 5 is that the angles α and β in FIGS. 1 and 3 are 6.5° and 9°, respectively. be.

As described above, according to the present invention, it is possible to join two pieces of wood very easily and firmly, and there is an advantage that joining can be achieved extremely efficiently without requiring complicated work.

[Brief explanation of the drawing]

1 and 2 are an explanatory front view and a central sectional view thereof of the joining tool of the present invention, FIGS. 3 and 4 are a sectional view and a plan view, respectively, of the main parts of the wood to be joined, and FIG. 5 and FIG. 6 are explanatory sectional views sequentially showing states in the joining method of the present invention. 1...Joint tool, 2...Connection part, 3.
... Leg part, 4 ... Wood, 5 ...
・Hole, 6...groove.

Claims (1)

[Scope of Claims] 1. A step in which holes are formed in two pieces of wood to be connected, the sides of which are in contact with each other, and which are inclined so as to open outward from their upper surfaces. forming a rectangular groove in the two pieces of wood that connects the two pieces of wood, and an intermediate connecting part with a rectangular cross section and two leg parts with a circular cross section that protrude integrally from both ends of the intermediate connecting part and form a U-shape together with the intermediate connecting part. and the step of press-fitting the leg portions and the intermediate connecting portion of the joint tool into the hole and rectangular groove of the wood, respectively, the opening angle of the two leg portions being slightly smaller than the opening angle of the hole. A distinctive method of joining wood. 2 Consisting of an intermediate connecting portion with a rectangular cross section and two leg portions with a circular cross section that protrude integrally from both ends of this intermediate connecting portion and form a U-shape together with the intermediate connecting portion, and each of the two leg portions is inclined outward. a connecting device, and inclined holes spaced apart equal to the length of the intermediate connecting portion of the connecting device, the sides of which are in opposition to each other, and the holes are formed to open slightly wider than the opening angle of the two leg portions of the connecting device from the upper surface thereof. and two pieces of wood having a rectangular groove connecting the upper portions between the two holes.