JPH08159124A - Staple - Google Patents

Abstract

PURPOSE: To improve extraction-proof stress of a staple and prevent deformation at driving time, by providing a coating layer directly in a base in a lower half part of the staple, and connecting an upper half part of each staple by a bonding agent, so as to prevent separating a coating from the staple. CONSTITUTION: A bonding agent is applied to an upper half part of a portal staple 11, to bond a plurality of the staples 11, and a coating agent of synthetic resin, nitrocellulose, etc., is applied to a lower half part of the portal staple 11, to form a hardening coating layer 12. In the case of driving this staple 11 by a stapling machine, a bonding agent layer 13 and the hardening coating layer 12 are broken, and the hardening coating layer 12, without separating from the staple 11, is driven into an object, to make adhesive to a hole wall the hardening coating layer 12 in the lower half part of the staple 11 advanced into a bed material. Since each staple 11 is bonded by the bonding agent 13 sorter than the hardening coating layer 12, even when applied a shock and bending stress at transport time or the like, disruption is prevented to maintain a form as a connecting type staple.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a staple, and more particularly to a construction staple provided with a coating for improving pull-out resistance.

[0002]

2. Description of the Related Art Conventionally, architectural staples have been coated with a synthetic resin such as polyester or acrylic, nitrocellulose, or a mixture of the above materials on the surface of staples to achieve a rust-preventing effect, a reduction in impact resistance and an improvement in pull-out resistance. It has been known.

5 to 7 show the staple 1 described above. As shown in the sectional view of FIG. 7, an adhesive layer 2 is formed on both the inner and outer surfaces of the staple 1 or on one side thereof.
Are adhered, and a cured coating layer 3 of polyester, nitrocellulose or the like is further provided on the adhesive layer 2.

The coated staple 1 has improved corrosion resistance against rust and the like, and the hardened coating layer 3 reduces the driving resistance to prevent the staple 1 from bending. Also,
After the driving, the hardened coating layer 3 adheres to the wood and has an effect of improving the pulling resistance.

In the production of this type of staple, a wire material which is a staple material is press-molded into a gate shape and bonded with an adhesive to form a connected staple, and then a coating agent is applied to form a cured coating layer. A hardened coating layer is formed by providing or by cutting a parallel wire rod in which a large number of wire rods are bonded by an adhesive agent to a specified length, press-molding in a gate shape, and then applying a coating agent.

[0006]

In the conventional interlocking staple provided with a coating layer, the surface of the staple is coated with an adhesive, and the coating layer is formed on the surface of the adhesive layer. Therefore, as the pull-out stress applied to the staple is increased,
There is a drawback that the adhesive layer, which is softer and has lower strength than the coating layer, is destroyed first and the coating layer is peeled off from the staples, so that the effect of providing the coating is not sufficiently exerted.

Therefore, there arises a technical problem to be solved in order to further improve the pull-out resistance of the staple, and the present invention aims to solve the above problem.

[0008]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and an adhesive is applied to the upper half of the gate-shaped staple to bond a plurality of staples.
A staple is characterized in that a cured coating layer is formed by applying a coating material such as synthetic resin or nitrocellulose to the lower half portion of the gate-shaped staple.

[0009]

In the staple of the present invention, an adhesive is applied to the upper half to connect a plurality of staples, and a cured coating layer of synthetic resin or nitrocellulose is formed on the lower half of the staple. When this staple is driven by the staple driving machine, the adhesive layer and the cured coating layer are broken, and the cured coating layer is driven into the object without peeling from the staple, and the lower half of the staple that has entered the base material. The hardened coating layer adheres to the hole wall. In addition, since each staple is bonded with an adhesive that is softer than the cured coating layer, it does not split even if shock or bending stress is applied during transportation,
The form as a connected staple is maintained, and there is no fear of causing trouble in use or reducing the commercial value.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a flowchart of a staple manufacturing process. First, a long-winding iron wire is fed and rolled by a wire rod rolling mill (step 1), and the wire rod passing through the wire rod rolling mill is introduced into a cutting machine (step 2). .

Then, the wire material cut at a constant feed length is press-formed into a gate shape by a press machine (step 3), and a plurality of staples (the number of which is determined by the design specifications of the staples) are arranged. Then, the adhesive is introduced into the adhesive applicator along the guide (step 4), the adhesive is applied to both the inner and outer surfaces of the staple, or one surface thereof, and the staple passes through the adhesive applicator. A drying step (step 5) is provided during the process of moving to the coating agent coating step, and a dryer is used as necessary.

Subsequently, the coating material is introduced into a coating material coating machine, the lower half portion is dipped in a coating material dip tank, the coating material is applied to the entire lower half portion (step 6), and a drying step (step 7) is performed. The staple 11 shown in FIG. 2 is completed.

As shown in FIGS. 2 to 4, the staple 1
In No. 1, a hardened coating layer 12 is formed on the lower half of both legs, and an adhesive 13 is applied to the upper half of the legs to connect a large number of staples 11.

When the staple 11 is loaded into the staple driving machine and driven into building wood or the like, the leading staple 11 is struck by the driver of the staple driving machine to break the adhesive layer 13 and the cured coating layer 12, This staple 11 is driven into an object. Then, the hardened coating layer 12 of the staple 11 that has been driven into contact with the wall of the hole that has been opened in the object, and the staple 11 is firmly fixed.

Further, as a result of experiments, it has been found that the pull-out strength is most improved by setting the length of the hardened coating layer 12 in the vertical direction to be substantially equal to the length by which the staple enters the building base material. The length of the cured coating layer 12 is
It is adjusted by controlling the liquid level position of the coating dip bath.

On the other hand, the vertical length of the adhesive layer 13 is
Set according to the unit weight of staples and the number of adhesives,
Depending on the setting of the vertical length of the hardened coating layer 12, the adhesive layer 13 and the hardened coating layer 12 may overlap, but in order to prevent the pulling-out proof strength from deteriorating, it is necessary to overlap the applied parts. It is preferable to avoid it as much as possible.

The adhesive force of the hardened coating layer 12 itself also causes the connecting and bonding action of the staples, and the pull-out strength increases or decreases depending on the thickness of the hardened coating layer 12. Therefore, in the case where the vertical length of the cured coating layer 12 must be set shorter than an ideal value by the vertical length of the adhesive layer 13 for ensuring the minimum necessary adhesive force for staple connection. By adjusting the thickness of the cured coating layer 12, it is possible to offset the decrease in pulling strength.

Comparing the staple 11 with the conventional staple, the staple 11 of the present invention is improved in pull-out resistance by about 10 to 20% (varies depending on the thickness of the cured coating layer 12) as compared with the conventional staple. There is.
The coating agent is a known synthetic resin coating agent such as polyester or acrylic resin, nitrocellulose or a mixture thereof, and is not particularly limited.

[0019]

As described in detail in the above embodiment, the present invention provides a coating layer directly on the base material of the lower half of the staples and connects the upper half of each staple with an adhesive. The invention is capable of reliably exerting the performance of the coating agent without peeling the coating from the staples, improving the pull-out resistance of the staples, and preventing deformation during driving.

[Brief description of drawings]

FIG. 1 is a flowchart showing a staple manufacturing process of the present invention.

FIG. 2 is a perspective view of a staple of the present invention.

3 is an end view of the staple shown in FIG.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a perspective view of a conventional staple.

FIG. 6 is an end view of a conventional staple.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

[Explanation of symbols]

 11 Staples 12 Cured coating layer 13 Adhesive layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Abe 6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo Max Co., Ltd.

Claims (1)

[Claims] 1. An adhesive is applied to the upper half of the gate-shaped staple to bond a plurality of staples, and a coating agent such as synthetic resin or nitrocellulose is applied to the lower half of the gate-shaped staple to cure the coating. A staple formed by forming a layer.