JPH0139930Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is used for connecting parts, especially corners, of various wood products such as wooden door frames and wooden knock-down furniture. Concerning improvements to product coupling fittings.

[Conventional technology]

Conventionally, for example, in wooden knock-down furniture, bolts and nuts have been used as a means of connecting vertical and horizontal parts to each other. One of these nuts is one that is embedded inside a wooden part, and is called an onime nut 1' as shown in FIG.

This has a female thread 2 formed on the inner periphery of a cylindrical nut body 1'A, and a large number of sharp biting protrusions 3, each of which is independent and has a generally spiral shape, on the outer periphery of the nut body 1'A. At the same time, cutout portions 4 are provided between the biting protrusions 3 and arranged in the axial direction, and in use, first, a hole nut 1' is inserted into the mounting hole 5a of one of the wooden parts 5. By driving in the bolt 7 inserted from the outside of the other wooden part 6 to be connected and screwing it into the female thread 2 of the nut body 1'A of the Onime nut 1',
Two wooden parts 5 and 6 were connected to each other.

[Problem that the invention attempts to solve]

When the above-mentioned Onime nut 1' is embedded in a wooden part prior to joining the two parts 5 and 6, the conventional product uses a cylindrical nut body 1'.
Because the pitch of the roughly spiral-shaped, independent sharp biting protrusions 3 formed on the outer periphery of A was narrow, excessive force was applied to the wood, sometimes causing cracks along the fibers of the wood. Furthermore, when the wood cracks, the biting force of the biting protrusions 3 against the wood decreases, resulting in a decrease in the tensile strength of the bolt-nut connection.

[Means for solving problems]

This idea was created in view of the problems mentioned above.
For example, by making the spiral pitches of the biting protrusions at approximately twice the spacing of the conventional one and making it larger than the regulation width, excessive force is prevented from being applied to the wood, and the above-mentioned drawbacks of the conventional method are avoided. We are trying to solve this problem.

〔Example〕

First, an embodiment of the present invention will be described with reference to FIG. In the following description, parts that are the same as those shown in FIG. 2 are designated by the same reference numerals.

1 is an onime nut, 1A is a cylindrical nut body, and the tip of this nut body 1A is formed into a slightly constricted part _1A .
This reduces the resistance when inserting into the mounting hole 5a of the component 5 to be described later. 2 is a female screw. Reference numeral 3 denotes a large number of sharp biting protrusions formed on the outer periphery of the nut body 1A in a substantially spiral shape, each independent of the other. The pitch of the biting protrusions 3 reduces excessive force on the wood. In order to prevent the occurrence of cracks, etc., they are formed wide with an interval approximately twice the width of the conventional regulation.

Reference numeral 4 indicates a missing portion disposed in the axial direction between a large number of biting protrusions 3, 5 indicates a component to be joined to component 6, and 7 indicates a bolt.

Reference numeral 8 denotes a lid that is removably fitted into the tip opening 2a of the female thread 2 of the nut body 1A, and this lid 8 reinforces the fixing force of the biting protrusion 3 and firmly holds the onime nut 1. In order to install it in the mounting hole 5a and prevent the wood from cracking, the adhesive injected into the mounting hole 5a flows into the female thread 2 and hardens.
This prevents clogging. Reference numeral 9 denotes a flange formed at the rear end of the outer periphery of the nut body 1A.

One embodiment of the present invention has the above-described configuration, so when connecting the two wooden parts 5 and 6, after injecting adhesive into the mounting holes 5a of the parts 5, When the nut 1 is driven into the mounting hole 5a of one part 5 using a hammer or the like,
The tip of the nut main body 1A is slightly narrowed to reduce resistance, so that embedding into the mounting hole 5a can be performed smoothly. At this time, since the lid 8 is fitted to the tip opening 2a of the female thread 2 of the nut body 1, the adhesive injected into the mounting hole 5a does not flow into the female thread 2.

Since a spiral biting protrusion 3 is formed on the outer periphery of the nut body 1A and has a pitch approximately twice as large as that of the conventional regulation, the mounting hole 5
When embedding the nut body 1A in the interior of the nut 1A, the biting protrusion 3 does not apply excessive load to the wood, and cracks can be prevented from occurring in the fiber direction of the wood. Furthermore, as the adhesive hardens, the fixing force of the biting protrusion 3 is assisted to firmly mount the blind nut 1 in the mounting hole 5a, and cracking of the wood can be prevented by adhesion and hardening of the adhesive.

After completing the embedding work of the nut body 1A, the two parts 5 and 6 are connected by screwing the bolt 7 inserted from the outside into the other wooden part 6 into the female thread 2 of the nut body 1A. . At this time, as described above, the lid 8 is fitted to the tip opening 2a of the female thread 2 of the nut body 1A to prevent the adhesive from flowing into the female thread 2. The bolt 7 can be screwed into or out of the female thread 2 smoothly.

In this way, cracks occur in the wood and the Onime nut 1 buried in the mounting hole 5a shifts and moves.
Two wooden parts 5 and 6 can be firmly connected to each other without reducing the tensile strength of the blind nut 1 and the bolt 7.

In addition, in the above embodiment, the pitch of the biting protrusion 3 was formed to be approximately twice the regulation value, but this is just an example.
In short, the biting protrusions 3 should be adjusted to the extent that the biting strength of the biting protrusions 3 into the wood is not impaired, and in addition, it is possible to prevent excessive force from being applied to the wood and causing cracks.
The pitch width may be made larger than the regulation width.

Further, although the lid 8 is formed separately from the Onime nut 1 and is detachable from the nut body 1A, even if the lid 8 is formed integrally with the nut body 1A and closes the tip opening 2a, the female screw It is possible to prevent the adhesive from flowing into 2, and the number of parts is reduced.
Needless to say, the cost will be low.

[Effect of idea]

As mentioned above, in the present invention, the pitch of the spiral biting protrusions formed on the outer periphery of the nut body is made larger than that of the regulation, so that excessive force can be prevented from being applied to the wood. Therefore, when this embodiment is embedded and fixed in the mounting hole of one component, cracks in the wooden component will not occur along the fiber direction of the fragile wood due to its strength. In addition, since the onime nut can be firmly embedded and fixed in the mounting hole without impairing the biting force of the biting protrusion against the wood, the tensile strength of the bolt-nut connection will not decrease as a result, resulting in a structurally It has the advantage of being able to firmly connect wooden parts to each other.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing how wooden parts are joined together using a joining fitting according to an embodiment of the present invention;
FIG. 2 is a sectional view showing how wooden parts are joined together using a conventional joining fitting. 1... Onime Natsuto, 1A... Natsuto body, 2...
...Female thread, 2a...Tip opening, 7...Bolt,
8... Lid.

Claims (1)

[Scope of utility model registration request] This onime nut has a female thread carved on the inner periphery and biting protrusions arranged in a spiral on the outer periphery, and is characterized by the fact that the tip of the nut body is slightly narrowed and a lid is detachably attached to the tip opening. Connecting fittings for wood products.