JPH0861342A - Embedded type screw nail - Google Patents

Abstract

PURPOSE: To eliminate the appearance of a gap between members, which is peculiar to a screw nail, strengthen the member joining force of the screw nail, and hide the whole screw nail in the members to improve the fine view of a use object such as furniture in the embedded type screw nail which is screwed into overlapped inside and outside members to joiningly retain both the members. CONSTITUTION: In an embedded type screw nail which is screwed into overlapped inside and outside members to joiningly retain both the members, about the spiral screw of a stem part, the pitch of a screw part 3a contacting the inside member of a screw tip part is set large, and the pitch of a screw part 3b contacting the outside part member on a nail head 2 side is set small. Also the screw parts having the large and small pitches are made continuous, or intermittent, or dual structure, and also a shearing part 4 having a narrowed axis diameter is formed in the vicinity of the nail head 2 of the screw part contacting the outside part member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedded type screw nail applied to join and hold a plurality of members, especially in furniture manufacturing.

[0002]

2. Description of the Related Art Conventionally, for example, in furniture manufacturing, when two plate members are joined by using screw nails and the nail head is hidden in the plate member, a recess is previously formed on the surface of the plate member. After driving a screw nail into the recess, a dowel shaft is fitted in the recess to hide the nail head.

[0003]

However, in the above-mentioned conventional structure, a great deal of labor is required for cutting the recess in which the dowel shaft fits, fitting the dowel shaft, and finishing the surface of the dowel shaft part, resulting in poor workability. .

Of course, the screw nail does not immediately pass through the plate material on the screwed side and penetrates into the back plate material, but usually enters after a slight idle rotation. During this idle rotation, screw holes are already formed on the front plate by screw nails, so the tip of the screw nail pushes the back plate apart and penetrates, resulting in a gap between the front and back plates. Occurs.

The above-mentioned gap is eliminated by further axially rotating the screw nail after the nail head comes into contact with the plate material.
In this case, the screw holes of the front plate member collapse, and therefore the joining force between the plate members depends on the joint surface between the back plate member and the screw portion and the front plate member and the nail head, which is a problem that it is weak mechanically.

For this reason, recently, in the furniture industry, the threaded portions on the shafts respectively function as a coupling force for a plurality of members, and when both members are completely joined, the nail shaft is used to move the nail head. Although there has been a strong demand for the appearance of an embedded screw nail that is sheared in the vicinity and hides the screw nail, there is currently no such screw nail.

Therefore, in the present invention, the pitch of the spiral screw formed on the nail shaft is set such that the screw portion corresponding to the back side member is large, the screw portion corresponding to the front side member is small, and near the nail head. It is an object of the present invention to provide a novel embedded screw nail that satisfies the above-mentioned demands and improves the functionality and usability of the screw nail by forming a shearing portion having a thin shaft diameter.

[0008]

Means for Solving the Problem To explain the means of the present invention for achieving the above object, the present invention relates to an embedded screw nail which is screwed into a polymerized front and back member to join and hold both members. In the spiral screw of the shaft body, the pitch of the screw portion corresponding to the back side member of the screw tip portion is set large, the pitch of the screw portion corresponding to the front side member on the nail head side is set small, and the pitch is large. The threaded part and the threaded part with a small pitch have a continuous, interrupted, or continuous structure, and a shearing part with a reduced shaft diameter is formed near the nail head of the threaded part corresponding to the front side member. Is.

[0009]

In the embedded screw nail according to the present invention, the pitch of the screw portion corresponding to the back side member on the screw tip side is large with respect to the spiral screw formed on the shaft body, and the front side member on the nail head side is made of material. Since the pitch of the corresponding screw part is set small and a thin shaft shearing part is formed in the vicinity of the nail head, when this screw nail passes through the front side member and penetrates into the back side member, However, as the penetration increases, the screw shaft has a large axial movement amount with respect to the back side member and a small axial movement amount with respect to the front side member. The parts are completely joined.

In such a joined state of the members, all the threads of the spiral screw of the screw shaft are screwed into both members, and the strengthening of the coupling force is realized.

When the two members are joined, the shearing portion near the nail head is located inside the front member. At this time, when the screw shaft is further rotated, the screw shaft is pulled into the member by the spiral screw. Because force works and this is stopped by the nail head,
The shearing portion of the thin shaft concentrates the rotational force and the pulling force and shears, and the screw nail entirely hides in both members, thereby achieving the effect of achieving the initial object of the invention.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of an embedded screw nail according to the present invention, FIG. 2 is an explanatory view showing a use state, and FIG. 3 is another embodiment of the embedded screw nail according to the present invention. The side view which represented the part in the cross section is shown.

The present invention is an embedding type screw nail that is screwed into the front and back members and jointly holds both members, and is manufactured by rolling process using various metal wire rods or forming process using tough synthetic resin material. .

In the embedded screw nail 1, as shown in FIG. 1, a spiral screw 3 is formed on the shaft body leaving the nail head 2, and the nail head 2 is provided with a recess 21 into which a rotary tool is fitted. is there.

According to the present invention, in the above-mentioned spiral screw 3, the pitch of the screw portion 3a corresponding to the back side member of the screw tip portion is set to be large, and the pitch of the screw portion 3b corresponding to the front side member on the nail head side is set to be small. At the same time, the threaded portion 3b is formed with a shearing portion 4 having a reduced shaft diameter in the vicinity of the nail head 2.

The screw nail 1 of the illustrated example shows an example in which the screw portions 3a and 3b having different pitches are continuous and a series of spiral screws 3 are coaxially provided.
It is also possible to separate a and the screw part 3b. In addition, if necessary, a threaded structure in which the pitches 3a and 3b with different pitches are intermittently provided is provided, or a continuous connection screw is provided in the valleys of both threaded portions 3a and 3b or the dividing shaft portion of the threaded portion 3a and the threaded portion 3b. Needless to say, the present invention is implemented within the technical scope of the invention.

Further, the screw lengths of the both screw portions 3a, 3b do not have to be matched with the material thickness of the front side member and the back side member, and of course, the screw side 3b having a small pitch is back side at the completion of screwing. Needless to say, it is also possible to position it in the member.

Next, the shaft diameter of the shearing portion 4 is determined by the screw nail 1
Set to an arbitrary shaft diameter according to the shaft thickness, length, and application.

In the embodiment shown in FIG. 3, with respect to the spiral screw 3 of the shaft body, the pitch of the screw portion 3a corresponding to the back side member of the screw tip portion is large and the front side member on the nail head side is the same as in the above example. The pitch of the screw portion 3b corresponding to the above is set small, and in this embodiment, the nail head is omitted and the concave portion 21 into which the rotary tool is fitted is formed directly on the base end surface of the screw shaft portion.

Therefore, the screw nail 1 of the present invention is made of wood and wood, concrete or mortar and wood, metal and wood, concrete or mortar and metal, stone and wood, etc.
It can be applied to the joining of various members, and FIG. 3 shows a joining state of wooden members.

In FIG. 3, when the screw nail 1 is screwed directly into the superposed front and back members 5 and 6, when the screw nail 1 passes through the front side member and penetrates into the back side member 6, both members 5,
A gap is formed between 6 as in the conventional case. Since the pitch of the screw portion 3a advancing through the back side member 6 is set larger than the pitch of the screw portion 3b advancing through the front side member 5 as the penetration progresses, the screw shaft 1 has a larger axial movement amount than the back side member 6. ,
The axial movement amount is smaller than that of the front side member 5, and therefore the front and back members 5 and 6 are completely joined due to the difference in the movement amount due to the coaxial rotation.

In the above-mentioned joined state of the members 5 and 6, all the threads of the spiral screw 3 of the screw shaft 1 are screwed into both members,
Achieve a stronger bond.

When the members 5 and 6 are joined, the shearing portion 4 near the nail head 2 is located inside the front member 5.
At this time, when the screw shaft is further rotated, a tensile force that penetrates into the member by the spiral screw 3 acts on the screw shaft,
Since this is blocked by the nail head 2, the shearing portion 4 concentrates and shears the rotational force and the tensile force, and the screw nail 1 is entirely hidden in both members.

Due to the shearing of the shearing portion 4, the nail holes formed in the front member 5 are restored by the elasticity of the plate material or restored by the hygroscopic expansion to be closed.

When the screw nail 1 is used for a plate material such as furniture, a jig (not shown) for receiving the lower surface of the nail head 2 is used as necessary to prevent the surface of the plate material from being damaged.

When the screw nail of the present invention is used as a base material for mortar, blocks, concrete, metal materials, etc.,
Needless to say, a preliminary hole (not shown) suitable for the screw nail 1 is preliminarily formed in the base material to perform the work.

In the embodiment shown in FIG. 3, the base material to be used is provided with a concave portion at a screwing point in advance, and the screw nail 1 is screwed into the concave portion. It is the one that fits the shaft and closes it.

[0028]

As described above, the present invention is an embedded type screw nail that is screwed into a superposed front and back member and holds both members together, and is a backside member of the screw tip portion with respect to the spiral screw formed in the shaft body. Since the pitch of the screw part corresponding to the above is set to be large and the pitch of the screw part corresponding to the front side member on the nail head side is set to be small and the thin shaft shearing portion is formed in the vicinity of the nail head, use this screw nail. At the time of passing through the front side member and entering the back side member, a gap is created between both members as in the conventional case, but as the penetration progresses, the screw shaft has a large axial movement amount with respect to the back side member,
The axial movement amount is small with respect to the front side member, and therefore the front and back members are completely joined due to the difference in the movement amount due to the coaxial rotation.

Further, particularly in the state where both members are joined, all the threads of the spiral screw of the screw shaft are screwed into both members to strengthen the coupling force.

Of course, when the two members are joined, the shearing portion near the nail head is located inside the front member. At this time, when the screw nail is further rotated, the screw nail moves in the member by the spiral screw. Since the pulling force that penetrates into the work is blocked by the nail head, the shearing part of the thin shaft concentrates the rotating force and the pulling force and shears, and the screw nail entirely hides in both members, and The effect of achieving the object of the invention is achieved.

[0031]

[Brief description of drawings]

FIG. 1 is a side view of an embedded screw nail according to the present invention.

FIG. 2 is an explanatory diagram showing a usage status.

FIG. 3 is a side view showing another embodiment of the embedded screw nail according to the present invention, a part of which is shown in cross section.

[0032]

[Explanation of symbols]

 1. Embedded screw nails 2. Nail head 21. Recessed part where the tool fits 3. Spiral screw 3a. Screw part corresponding to the back member 3b. 3. Threaded part corresponding to front side member 4. Shearing part

Claims (1)

[Claims] 1. An embedded screw nail that is screwed into a polymerized front and back member to bond and hold both members, wherein the spiral screw of the shaft body has a large pitch of the screw portion corresponding to the back member of the screw tip portion. , The pitch of the screw portion corresponding to the front side member on the nail head side is set to be small, and the screw portion having a large pitch and the screw portion having a small pitch have a continuous or intermittent or continuous structure, and
An embedded screw nail characterized in that a shearing portion having a reduced shaft diameter is formed in the vicinity of the nail head of the screw portion corresponding to the front side member.