JP2002362094A - Thumbtack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thumbtack capable of being simply inserted by assuring amounting strength at a member to be mounted such as a brittle and relatively soft gypsum board or the like and being simply used without retaining a large hole after removing. SOLUTION: The thumbtack 10 comprises a mounting leg 14 to be inserted into the gypsum board 1, and a head 11 capable of being inserted with the leg 14. The leg 14 is formed spirally engaged and capable of being inserted into the board 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thumbtack which can be suitably inserted into a member to be attached such as a gypsum board, which is easily pulled out of a thumbtack having a general needle-like mounting leg.

[0002]

2. Description of the Related Art Conventionally, as a thumbtack used for a gypsum board (attached member), as disclosed in Japanese Patent Application Laid-Open No. 10-35190 and Japanese Utility Model Application Laid-Open No. 6-36897, an attached member is used. Spiral ridges may be provided on the outer peripheral surface of the thick needle-like mounting leg to be inserted into
As is known from Japanese Patent Publication No. 002551, etc., in addition to a thin needle-like mounting leg portion to be inserted into a member to be mounted, there is another type in which a plurality of thin pins are separately inserted from a head for inserting a thumbtack. Was.

[0003]

However, in the former type, it is inevitable that a large hole is opened in the gypsum board after the thumbtack is removed. The rear holes are noticeable and difficult to use.

In the latter type, although a noticeable hole is not formed in the gypsum board after the thumbtack is removed, it is necessary to insert a plurality of pins to be used at the time of insertion. And it took time to remove it.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can be easily inserted into a member to be mounted such as a gypsum board which is brittle and relatively soft, and can be easily inserted and removed. An object of the present invention is to provide a thumbtack that can be used easily without leaving a large hole.

[0006]

SUMMARY OF THE INVENTION A thumbtack according to the present invention is a thumbtack having a mounting leg portion to be inserted into a member to be mounted and a head capable of inserting the mounting leg portion. The mounting leg is formed in a spiral shape so that it can be screwed in and inserted into the mounted member.

In the thumbtack according to the present invention, the head can be gripped at the time of insertion and the attachment leg can be screwed into the attachment pin to easily attach it to the member to be attached. In addition to the frictional resistance of the outer peripheral surface of the inserted part itself, the inserted spiral part locks a part of the mounted member in the direction along the axial direction of the mounting leg. ,
The mounting strength can be improved, and the mounting member can be mounted.

Then, the thumbtack can be easily removed from the member to be mounted by pulling out the mounting leg while turning the head so as to remove the screw. After the removal, the thumbtack is inserted into the member to be mounted. Only a small hole having a small diameter in the part itself is opened, and the appearance of the attached member can be prevented from deteriorating.

Therefore, the thumbtack according to the present invention can be easily inserted into a mounting member such as a gypsum board, which is brittle and relatively soft, while securing the mounting strength.
After removal, it can be used easily without leaving a large hole.

[0010] If the main body portion of the mounting leg portion to be inserted into the member to be mounted is formed by setting the number of spiral turns within a range of 1 to 2 times, it is more preferably brittle. A thumbtack can be attached to a member to be attached such as a plasterboard or the like that is relatively soft.

That is, if the number of spiral turns of the main body to be inserted into the mounting member of the mounting leg is less than one,
The number of helical portions that lock a part of the mounted member along the axial direction of the mounting leg is reduced, and the mounting strength is reduced. In addition, when a load is applied to the mounting leg along the pull-out direction, for example, by suspending a heavy article or the like, the main body of the mounting leg turns so that the screw is released, and the thumbtack comes off from the member to be mounted. There is a fear.

Conversely, if the main body inserted into the member to be mounted on the mounting leg is formed with more than two helical turns, the part of the member to be mounted disposed between the helical parts Increases, the shear strength of the portion of the attached member is reduced, and when a heavy article or the like is used in a suspended state, the thumbtack is pulled out for each portion of the attached member between the spiral portions, resulting in a large push pin. There is a possibility that a hole is formed, which is not preferable.

If the mounting leg and the head are formed by bending a single continuous metal wire, the number of manufacturing steps and costs can be reduced, and the present invention can be easily implemented. Such a thumbtack can be manufactured.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the thumbtack 10 of the first embodiment has a mounting leg 14 to be inserted into the gypsum board 1 as a member to be mounted, and a head that allows the mounting leg 14 to be inserted. And a unit 11. In addition, this pushpin 10 is provided with a wire 3 as an attached member for suspending an article 4 such as a decoration or a display of a molding ball on a wall surface (ceiling wall surface) T of a window for a product display. Stop it.

The head 11 is formed in an annular shape having a locking hole 12 through which the wire 3 is inserted. The axis X of the locking hole 12 is disposed in a direction substantially orthogonal to the axial direction Y of the mounting leg 14. The head 11 is used as an operation gripping part when the mounting leg 14 is inserted into the gypsum board 1, and serves as a mounting part for mounting the mounting member 3 to the mounting member 1.

The mounting leg 14 is formed so that the wire W can be formed into a spiral shape and screwed into the gypsum board 1 on the wall surface T.
Is formed. In the case of the embodiment, the mounting leg 14 includes a base 15 on the head 11 side and a main body 16 extending spirally from the base 15, and the tip of the main body 16 is attached to the gypsum board 1. A tapered tapered portion 16a is formed for easy insertion.

The main body 16 has a diameter d of the wire W of 0.1 mm.
8 mm, spiral outer diameter D of wire W is 5 mm, wire W
The number of turns is about 1.5 times, that is, from the base 16b of the spiral main body 16 away from the base 15, the tip of the tip 16a is turned over half a turn over one turn. ing. The pitch P is 7.5 mm, and the length L is 9.5 mm.

The thumbtack 10 of the first embodiment is formed by bending a metal wire W such as spring steel to form a head 11 and mounting legs 14.
Is formed and manufactured. This manufacturing process, first,
As shown in FIGS. 3A and 3B, the wire W wound up in a roll shape is pulled out, and the end 7a side of the wire 7 is bent by a predetermined forming machine, and the mounting leg 1 is formed.
4 and the head 11 are formed into a product shape, and the end 7 of the strand 7 is formed.
A processing material 8 is formed on the a side. Next, as shown in FIG. 3C, the work material 8 is cut from the end 7a of the strand 7 by a predetermined press working to form a spare product 9. In addition,
At this time, the tip of the cut portion 7b of the wire 7 has a tapered portion 16
a is formed. The spare product 9 is quenched to increase the hardness, and further subjected to a surface treatment such as nickel plating to enhance the rust prevention effect.
To manufacture. In addition, the terminal 7 a on the side of the cut wire 7 is processed into a new processing material 8, and the above-described steps are sequentially repeated to manufacture the thumbtack 10 from the wire 7.

When the thumbtack 10 is used, the head 11 is gripped, and as shown in FIGS.
4 is inserted into a predetermined position of the gypsum board 1, and the main body 16 is screwed in until the base 15 of the mounting leg 14 comes into contact with the gypsum board 1. As shown in FIG. 10 can be easily attached to the gypsum board 1. Then, if the wire 3 is inserted through the locking hole 12 of the head 11 and the predetermined ornament 4 is attached to the wire 3,
The decorative article 4 attached to the wire 3 can be hung.

In the thumbtack 10, the main body 16, into which the mounting leg 14 is inserted, has a spiral wire W in addition to the frictional resistance of the outer peripheral surface of the wire W itself. Since 2 and 2 are locked in the direction along the axial direction Y of the mounting leg portion 14, the mounting strength can be improved and the gypsum board 1 can be mounted.

When removing the pushpin 10, the wire 3
Then, by pulling out the mounting legs 12 while turning the head 11 so as to remove the screw while holding the head 11, the thumbtack 10 can be easily removed from the gypsum board 1. After removal, the wire rod W is placed on the gypsum board 1.
Only a small hole having a diameter d of the gypsum board itself is opened, so that the appearance of the gypsum board 1 can be prevented from deteriorating.

Therefore, in the thumbtack 10 of the first embodiment, it is possible to easily insert the pushpin 10 into the brittle and relatively soft gypsum board 1 while securing the mounting strength, and without removing a large hole after removing. , Can be conveniently used.

In this pushpin 10, the mounting leg 14
The main body portion 16 inserted into the gypsum board 1 is formed by setting the number of spiral turns to about 1.5 times within a range of 1 to 2 times, so that it is more preferably brittle and relatively It can be attached to the soft gypsum board 1.

That is, if the body 16 of the mounting leg 14 inserted into the gypsum board 1 has less than one helical turn, one of the gypsum boards 1 along the axial direction Y of the mounting leg 14 is provided. The portion of the spiral wire W that locks the portion 2 is reduced, and the mounting strength is reduced. Further, when a load is applied to the mounting leg 14 along the pull-out direction, for example, by suspending a heavy article or the like, the main body 16 of the mounting leg 14 rotates so that the screw is released, and the thumbtack 10 is attached to the plaster board 1 There is a risk that the device will fall out of the device.

Conversely, if the main body 16 of the mounting leg 14 inserted into the gypsum board 1 is formed with more than two spiral turns, the gypsum board disposed between the spiral wires W In the case where the number of the portions 2a increases and the shear strength of those portions 2a is reduced and a heavy article or the like is used for hanging, the thumbtack 10 and the portion 2a of the gypsum board 1 between the spiral wires W are used. May occur and a large hole may be formed, which is not preferable.

In the thumbtack 10 according to the first embodiment, even if a load of about 20 N (about 2 kgf) is applied along the axial direction Y of the mounting leg portion 14, the thumbtack 10 is attached to the gypsum board 1 without any trouble. Was able to maintain.

Further, in the thumbtack 10 of the first embodiment, the mounting leg portion 14 and the head portion 11 are formed by bending a single continuous metal wire W.
It can be manufactured easily with reduced cost.

The diameter W of the wire W used for the mounting leg 14 of the thumbtack 10 is preferably 0.5 to 3 mm, more preferably 0.8 to 1.5 mm.
If the diameter dimension d is too small, the bending strength of the wire W is reduced, and the mounting leg 14 may be bent during use.
If the diameter d is too large, it is difficult to manually insert the mounting leg 14 into the member 1 to be mounted, and the hole remaining after removal becomes large, thereby deteriorating the appearance of the member 1 to be mounted. .

The spiral outer diameter dimension D of the mounting leg 14
It suffices if the head 11 can be gripped and the mounting leg 14 can be inserted, and the diameter (wire diameter) d of the wire W is 2 to 10 mm.
In the range of 2 times, preferably in the range of 3 to 7 times, 2 to 10
mm. If the outer diameter dimension D is too small compared to the wire diameter d of the wire W, the mounting strength when the number of spiral turns is reduced to about one or two turns is reduced, and conversely, the outer diameter dimension D
Is too large compared to the wire diameter d of the wire W, the head 11
When the user inserts the attachment leg 14 by operating the button, it is difficult to perform the insertion operation, and the attachment leg 14 is also easily bent.

Furthermore, the spiral pitch P of the mounting leg 14
It suffices that the mounting leg portion 14 can be inserted into the mounted member 1 without damaging the mounted member 1, and the diameter (wire diameter) d of the wire W is 3 to 20 times, preferably 5 to 10 times. Is preferably in the range of 4 to 12 mm. Pitch P
However, if it is too small compared to the wire diameter d of the wire W, there is a possibility that the attached member 1 may be damaged at the time of insertion of the mounting leg portion 14 or the like, and conversely, the pitch P is smaller than the wire d. If it is too large, the mounting leg portion 14 becomes too long, and when a tensile load is applied in the axial direction Y of the mounting leg portion 14 after mounting, the mounting leg portion 14 may turn so as to come off and the mounting leg portion 14 may come off. .

The gypsum board 1 has two thicknesses t of 9.5 mm and 12.5 mm.
It is a general-purpose type. Therefore, the pitch P may be set to about 2t / 3 minutes so that the number of spiral turns of the wire W is about 1.5 times within the thickness dimension t. That is, when a wire W having a wire diameter d of 0.8 to 1.5 mm is used, in the thumbtack 10 for the gypsum board 1 having a plate thickness t of 9.5 mm, the pitch P is 5 to 9 mm, and the plate thickness is t is 1
In the thumbtack 10 for the gypsum board 1 having a thickness of 2.5 mm, the pitch P is desirably 7 to 12 mm. In the thumbtack 10 for both purposes, the pitch P is set to 7 to 9 mm. In these cases, the spiral outer diameter D of the wire W is preferably in the range of 3 to 10 mm.

As shown in FIG. 4, the thumbtack 10A according to the second embodiment facilitates the insertion of the wire 3 as an attachment member into the locking hole 12 of the head 11A.
In addition, an opening 11a communicating with the locking hole 12 is formed. In such a thumbtack 10A, the locking and unlocking of the wire 3 can be easily performed using the opening 11a.

Note that the thumbtack 10A of the second embodiment is also a first pushpin.
Similarly to the first embodiment, the head 11A and the locking leg 14 are integrally formed by bending a continuous metal wire W, thereby obtaining the same operation and effect as the first embodiment. Can be.

In the first and second embodiments, the thumbtack 10.
Although 10A was formed integrally from the wire W, as in the third embodiment shown in FIG.
The mounting pin 14 may be welded to produce the thumbtack 10B.

Further, the pushpin 1 of the fourth embodiment shown in FIG.
As in the case of 0C, the head 11C may be formed of a synthetic resin such as polypropylene or ABS resin separate from the wire W.

Of course, if the strength of the mounting legs 14 can be ensured, the heads 11, 11A, 11B, 11C and the mounting legs 14
May be integrally formed from a synthetic resin such as polypropylene or ABS resin.

Further, the head 11 does not have a locking hole for inserting or suspending the string-shaped attachment member 3 such as a wire, and the head 11C of the thumbtack 10C of the fourth embodiment is not provided. As described above, the sheet 5 as an attached member attached to the attached member 1 may be pressed by the end surface 11b on the attachment leg portion 14 side. The head 11C is provided with a concave portion 11c along the circumferential direction, and the string-shaped attached portion 3 can be wound around the concave portion 11c.

[Brief description of the drawings]

FIG. 1 is a perspective view of a thumbtack according to a first embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams sequentially showing a usage mode of the thumbtack of the first embodiment.

FIG. 3 is a diagram illustrating a manufacturing process of the thumbtack of the first embodiment.

FIG. 4 is a view showing a thumbtack according to a second embodiment.

FIG. 5 is a diagram illustrating a thumbtack according to a third embodiment.

FIG. 6 is a cross-sectional view illustrating a usage mode of a thumbtack according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... (attached member) Gypsum board, 10.10A.10B.10C ... Thumbtack, 11 ... Head, 14 ... Attachment leg, 16 ... Main body, W ... Wire.

Claims (3)

[Claims] An attachment leg inserted into a member to be attached,
A thumbtack comprising a head that allows the attachment leg to be inserted and operated, wherein the attachment leg is formed in a spiral shape so that it can be screwed in and inserted into the member to be attached. Thumbtack characterized by being. 2. A body portion of the mounting leg portion to be inserted into the member to be mounted is formed by setting the number of spiral turns within a range of one or two turns. The thumbtack according to 1. 3. The thumbtack according to claim 1, wherein the mounting leg and the head are formed by bending a single continuous metal wire. .