JPH0242886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to improvement of resin nails.

[Prior Art] In constructing buildings and manufacturing furniture, iron nails are used to join various members.
This iron nail is not only cheap, but also
After being driven in, the surface oxidizes, and the resulting rust increases the frictional force, and as oxidation progresses to a certain extent, the surface deforms, which has the advantage of increasing bonding strength. It is widely used for this purpose.

By the way, in the case of iron nails, when humidity is high or salt is present, the oxidation speed becomes faster than normal, corrosion progresses rapidly, and the original joint strength is lost.

Therefore, resin nails have recently come into widespread use depending on the purpose.

[Problems to be solved by the invention] However, with this type of resin nail, there is almost no oxidation, so a sufficiently large frictional force is not generated on the surface of the nail, and the nail does not deform.
It lacks compatibility with wood, etc., and even if it has the desired joint strength when it is first driven, there have been problems in which the joint loosens over time, causing rattling or causing nails to fall out.

This invention was made against the above background and aims to provide a resin nail that can maintain sufficient bonding strength over time.

[Means for solving the problem] The resin nail of this invention is composed of a nail body and a head formed integrally with the nail body, and has a conductive heating element embedded in the nail body and It is formed by exposing the upper part of the head to the upper side of the head.

[Example] Figures 1 to 4 show an example of this invention, in which reference numeral 1 is a nail made of resin. As a resin material, it can withstand impact when driven with a hammer, etc.
It needs to be strong enough to endure without cracking or breaking, and it needs to be a thermoplastic resin. The nail 1 is composed of a nail body 1a and a head 1b integrally formed with the nail body 1a. A linear conductive heating element 1c is embedded in a U-shape in the length direction of the nail body 1a, and both ends 1c1 and 1c2 of the conductive heating element 1c are exposed on the upper surface of the head 1b. It is being It is desirable that these end portions 1c1 and 1c2 be exposed as much as possible so that the terminals 6 of the power source can easily come into contact with them during energization, which will be described later. Further, the material of the conductive heating element 1c must be a material such as nichrome wire that can instantaneously generate heat when energized and melt the resin portion of the nail 1 to some extent.

Next, how to use the resin nail 1 constructed as described above will be explained. First, when manufacturing furniture or the like, nails 1 are driven into joints 5a of boards 5 in the same way as usual. When all the nails 1 have been driven in, as shown in FIG. 3, the terminals 6 of the power source are brought into contact with both ends 1c1 and 1c2 of the conductive heating element 1c to turn on electricity. Then, the conductive heating element 1c generates heat, and the nail 1
Melt the resin part. The longer the energization time is, the more the amount will melt, and the shorter the energization time, the less the amount will be melted. Therefore, the energization time is adjusted depending on the material of the resin, the material of the conductive heating element 1c or the plate, etc. As a result, as shown in FIG. 4, a part of the melted resin can enter the woody structure of the board 5 and integrate the nail 1 and the board 5, increasing the pull-out resistance of the nail 1 and causing the board to It is possible to increase the bonding strength between the parts.
This is particularly effective when the board 5 is made of a material with a rough structure, such as plywood, because the resin easily penetrates into it. Since the nail 1 is made of resin, sufficient bonding strength can be maintained semi-permanently without oxidation or corrosion even in humid or salty locations.

Note that the head 1b of the nail 1 in the above embodiment may be configured as shown in FIG. That is, head 1
Two recesses 1b1 are formed on the upper surface of b. This recess 1b1 includes 1 of the conductive heating element 1c.
c1 and 1c2 are shown.

When the head 1b1 has such a configuration, the nail 1
Both ends 1c of the conductive heating element 1c when driving
1 and 1c2 are not crushed, and the power supply terminal 6 can be quickly applied using the recess 1b1 as a guide.

[Effects of the invention] This invention is made of a resin nail with a conductive heating element embedded in the nail body and both ends of which are exposed on the upper surface of the head. Can melt resin. Therefore, some of the melted resin gets into the part to be driven.
It is possible to increase the joining strength by increasing the pull-out resistance. Moreover, the surface of resin nails hardly oxidizes, and the desired bonding strength can be maintained semi-permanently.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of this invention. Figure 1 is a front view of the nail, Figure 2 is a plan view of the nail, and Figure 3 is a joint showing the state in which the nail is driven. FIG. 4 is a sectional view of the joint after the nail is energized, and FIG. 5 is a partial sectional view showing a modification of the nail. 1...nail, 1a...nail body, 1b...head, 1
c... Conductive heating element, 1c1, 1c2... Both ends.

Claims (1)

[Scope of utility model registration request] A resin-made nail consisting of a nail body and a head formed integrally with the nail body, characterized in that a conductive heating element is embedded in the nail body and both ends thereof are exposed on the upper surface side of the head. nail.