JPS6342124B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a notch near the nail head, and after driving the nail, taps it from the side to break and remove the nail head, which can be used to fix floorboards, edges, baseboards, doorstops, etc. This invention relates to the structure of hidden nails used in areas where nail heads were previously cut off, such as edge fasteners. Taking the flooring of a building as an example, as shown in Figure 1, a large number of floorboards 2 are strung together and stretched over joists 1 that are stretched over a large floor at predetermined intervals. . A tongue-and-groove joint with an uneven shape is generally used to butt the floorboards together. In this tongue and groove joint, in order to fix the floorboard 2 on the joist 1, the tongue 3
A nail 4 is driven diagonally toward the joist 1 from the upper base of the joist. The situation is shown in Figure 2. First, a nail 4 is driven diagonally into the upper base of the tongue 3 to near the nail head (a), and then the nail 4 is driven using a punch 5 until the nail head is hidden in the floorboard (b). In other words, it requires two efforts: one for ordinary nailing and one for using a punch. In flooring work, a large number of floor pegs are driven, so it takes a lot of effort to do the work twice. Therefore, by creating a notch near the nail head, driving the nail in until the notch is hidden, and then hammering from the side to remove the upper part from the notch, the driving work with a punch can be avoided. Can be omitted. The present inventor previously proposed such a floorboard construction method and floorboard pegs in Japanese Patent Application No. 1983-67466. The present invention relates to an improvement in a concealed nail provided with the above-mentioned notch and used mainly for floor fixing. If a notch is provided near the nail head, the deeper the notch becomes, the more likely it will break during nail driving. Ordinary type of nail (only the nail body shown in Figure 3a)
Table 1 shows the situation when making a notch in the nail.This means that the nail body is 1.5mmφ and the length is 21mm, and the cut is made 0.1 to 0.25mm at a position 3.5mm from the nail head.
This is a table showing the breakage condition for each 10 pieces when a notch with a depth of .

【table】

[Table] As is clear from this table, the depth of the cut is
If the nail is 0.1 mm, that is, the residual diameter (cut diameter) is 1.3 mm, it will not break properly, or it will not break unless it is bent at an angle of 45° or more, but if the residual diameter is in the range of 1.15 to 1.25 mm, it will not break after nailing. If you hit it from the side, it will break and become a hidden nail in good condition. If the remaining diameter is 1.00 to 1.10 mm, it cannot be used because it will break before nail driving or break during nail driving. i.e. slightly 1.15-1.25
It can only be used within the remaining diameter range of mm. This also applies to floor pegs whose nail bodies have a screw structure. Table 2 shows the case of a floor peg similar to the nail body in Figure 3b, and the diameter of the nail body is
These are the test results when the notch was provided at a position of 1.8 mmφ, 38 mm in length, and 8 mm from the nail head. Even in this case, it can only be used with a residual diameter within the range of 1.40 to 1.50 mm. In this way, the method of improving workability by providing a notch near the nail head is significant in achieving the purpose of providing a notch in itself, but the method of creating a notch is This required high precision, and it was difficult to prevent breakage before or during driving.

[Table] In view of the above-mentioned circumstances, the present invention enables stable nail driving regardless of the depth of the notch, and after driving the nail to the notch, it is easy to hammer the nail from the side. After various studies on nails whose heads can be removed, this is what we have come up with. A feature of the present invention is that a notch is formed near the head of a nail consisting of a nail head, a nail post, and a nail tip, and the outer periphery of the notch is covered with a reinforcing material such as rubber or plastic. A detailed explanation will be given below with reference to the drawings. FIG. 3 shows an example of the hidden nail of the present invention. a to d are longitudinal cross-sectional views, and e is a cross-sectional view taken along line A-A of a. The first example shown in a is a normal nail consisting of a nail head 6, a nail post 7 and a nail tip 8, with a notch 9 provided near the nail head 6, and this notch 9. This portion is covered with a thick-walled plastic reinforcing material 10. The characteristics of the reinforcing material 10 without extrapolation were previously explained with reference to Table 1. However,
By providing the reinforcement 10 in this manner, unexpectedly good results were obtained. The results are shown in Table 3.

[Table] As is clear from this test result, 1.00 to 1.25 mm
Breakage during driving has been eliminated over a wide range of areas. The second example shown in Fig. 3b is a nail with a threaded structure between the tip of the nail and the top of the nail post, which is generally used as a floor peg, and has a notch 9 in the same way as in a. Then, a reinforcing material similar to that in (a) was applied to cover that part. A performance test was conducted by changing the depth of the cut of this type of structure. The results are shown in Table 4.

[Table] In this case as well, as shown in a, it has become possible to use the cut portion in a wide range of diameters (residual diameter) from 1.25 to 1.50 mm without breaking. A third example is shown in FIG. 3c. In this example, the nail body is similar in overall shape to a conventional silk hat nail, but it is a screw body nail with an inverted triangular flange 11 at the bottom, and a cut is made just above the flange 11. A section 9 is provided. Flange part 11 of such a nail
A reinforcing material 10 is coated on the top. The fourth example is shown in FIG. 3d. This has a similar overall shape to a conventional double-headed nail, with a flat nail head on the top and an inverted triangular flange 11 on the bottom, making it a nail post with a screw structure. Such a nail is covered with a reinforcing material in the same manner as in c. Table 5 shows the performance test results before the reinforcing material was applied, and Table 6 shows the performance test results when the reinforcing material was applied. As is clear from these performance test results, the effect of reinforcing the cut portion can also be obtained by covering the reinforcing material with plastic that has become liquid through thermal melting or the like.

【table】

[Table] As exemplified above, the reinforcing material 10 can be obtained by inserting a block made of rubber, plastic, etc. with a hole in the center in advance, or by dipping the cut portion 9 into a liquid plastic solution. Either the plastic may be immersed to a maximum temperature and then the plastic may be cured and coated. What can be used as the reinforcing material 10 are:
In the case of externally covering the columnar block, it is made of a synthetic resin with relatively plasticity such as soft polyvinyl chloride or low density polyethylene, or rubber. Thermoplastic resins such as polyethylene, polypropylene, EVA, and SBR are used for coating by heating and melting the resin and immersing it from the head. Furthermore, a film may be formed by immersing it in liquid rubber latex or the like at room temperature and drying it. Next, the present invention will be specifically explained using examples. Example 1 The nail body has a flat nail head at the top as shown in Figure 3b, and a screw thread structure between the nail post and the tip, and a screw thread of 8 mm downward from the top of the nail head. A notch with a depth of 0.15 to 0.30 mm was provided at the position. The diameter of this nail body is 1.8 mmφ, and the overall length is 38 mm. A columnar soft polyvinyl chloride reinforcing material with a length of 12 mm and a diameter of 4 mm was extrapolated from the nail head to the lower part of the notch of the nail body. A test piece with this structure was tested by driving it diagonally from the base of the upper part of the tongue of the floorboard. As a result, as shown in Table 4 above, the depth of the cut was 0.15.
It could be successfully used over a wide range of ~0.275mm (cutting diameter 1.50~1.25mmφ). Example 2 Example 1 was applied to the upper part of the flange of a nail body as shown in Fig. 3d, which has a flat nail head and a flange 11 at the bottom with an interval of about 10 mm. Similarly, a notch was provided. The nail with this structure was inserted with its head facing down into low-pressure polyethylene melted at 135°C so that the notch was sufficiently immersed, and then lifted and solidified by air cooling. A synthetic resin coating layer approximately 2 to 2.5 mm thick was formed on the surface of the incision. The nails thus obtained were subjected to a driving test, and the results are shown in Table 6 above. In this type of flat nail head with a flange at the bottom, as shown in Figure 4a, when the nail is driven to the flange 11, the reinforcing material 10 moves away from the flange 11 as it is driven. Then, as shown in Figure 4b, if you hit the nail head from above or from the side, the top will easily separate from the notch and become a hidden nail.
In this way, the reinforcing material exerts a reinforcing effect near the notch when driving a nail. Once driving is completed, it is easily removed together with the nail head. The present invention has a structure as described in detail above, and by providing a notch near the nail head and using a reinforcing material to cover the notch, it can be separated from the notch. The product stability of the hidden nails used and their use made it possible to significantly speed up work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view of the floor of a house. FIGS. 2a and 2b are longitudinal cross-sectional views showing a conventional nail driving state.
Figures 3a to 3d are longitudinal cross-sectional views of the hidden nail of the present invention, and Figure 3e is a cross-sectional view taken along the line A-A in a. FIG. 4 is a longitudinal sectional view showing the state of use of the product of the present invention. 1... Joist, 2... Floor board, 3... tongue, 4...
Nail, 5... Punch, 6... Nail head, 7... Nail post, 8
... Nail tip, 9 ... Notch, 10 ... Reinforcement material, 1
1...Tsubabe.

Claims (1)

[Claims] 1 A notch 9 is formed near the nail head of the nail consisting of the nail head 6, nail post 7, and nail tip 8, and the outer periphery of the notch 9 is covered with a reinforcing material 10 such as rubber or plastic. A hidden nail.