JP2020179634A - Thumbtack - Google Patents

Abstract

To provide a thumbtack capable of making a pin hardly come off from a wall surface.SOLUTION: The thumbtack 100 includes a head part 1 and a needle part 3 having a plurality of needles 2. The head part 1 has a plane part 10 on one surface. Each of the needles 2 has a body part 20 and a tip part 24 and is erected from the plane part 10 of the head part 1 vertically to the plane part 10 in close contact with other needles. The body part 20 of each needle is prismatic. The tip part 24 of each needle 2 has a sharp shape comprising three planes 21, 22, 23. In the sharp shape, a regular triangular pyramid shape is inclined in a prescribed direction from a position where a center axis of the regular triangular pyramid shape in a longitudinal direction is coincident with a center axis of the body parts 20 in the longitudinal direction while an apex of the regular triangular pyramid shape is coincident with a corner part of the body parts 20. The prescribed direction is a direction in which an angle formed by a ridge line of the regular triangular pyramid shape including the apex and a side of the body parts 20 including the corner part is increased, and the angle of the corner is increased by a prescribed angle by the inclination.SELECTED DRAWING: Figure 1

Description

The present invention relates to studs.

Conventionally, in order to fix an article, a stud that is used by inserting a needle portion into a wall surface or the like has been required to have a needle portion that is difficult to come off from the wall surface.
Patent Document 1 describes an invention of a thumbtack in which a plurality of needles are provided on a disk and the needles are expanded in a wall surface. However, the invention describes a needle base because the needles are curved in the wall surface. Sufficient expansion at the edges was difficult.

Japanese Unexamined Patent Publication No. 2003-226097

In view of the above-mentioned fact that the needle is easily pulled out from the wall surface because it is difficult to sufficiently expand the base end portion of the needle, in the present invention, the base end portion of the needle is sufficiently expanded and the needle is pulled out from the wall surface. The purpose is to provide difficult studs.

The stud according to claim 1 of the present invention includes a head portion and a needle portion having a plurality of needles, the head portion has a flat portion on one surface, and each of the needles has a body portion and a tip. It has a portion and is erected in close contact with the flat portion of the head perpendicularly to the flat portion, the body portion of each of the needles is prismatic, and the tip portion of each of the needles is It is a pointed shape composed of three planes, and the pointed shape is from a position where the regular triangular pyramid shape coincides with the longitudinal central axis of the regular triangular pyramid shape and the longitudinal central axis of the body portion. One of the apex of the prismatic shape and one of the corners of the body portion are inclined in a predetermined direction while being coincident with each other, and the predetermined direction is the ridgeline of the regular triangular pyramid shape including the apex. The angle formed by the side of the body including the corner is increased, and the angle of the corner is incremented by a predetermined angle due to the inclination.

The stud according to claim 2 of the present invention is the stud according to claim 1, wherein the angle increment of the angle is greater than 0 degrees and less than 17.6 degrees.
It is characterized by that.

The stud according to claim 3 of the present invention is the stud according to claim 1, wherein the regular triangular pyramid shape is a regular tetrahedron, and the base angle of the regular triangular side surface of the regular triangular pyramid shape is 53 degrees or more. , 70.5 degrees or less.

According to the invention according to any one of claims 1 to 3 of the present invention, the stud includes a head and a needle portion having a plurality of needles, and the tip portion of each needle is formed from three planes. The pointed shape is a regular triangular pyramid shape that is inclined in a predetermined direction. Therefore, when each needle of the needle portion is inserted into the wall surface, the inside of the wall surface becomes a wall surface. On the other hand, a wall surface insertion space is formed which is substantially perpendicular to the wall surface, is substantially perpendicular to the wall surface, has a slight width in the direction orthogonal to the wall surface, and has the same width as the needle in the direction parallel to the wall surface. After that, each needle bends by receiving a force from the wall surface, tilts diagonally in a direction away from the vertical central axis of the head 1, and goes straight in the wall surface. The direction of inclination is such that the acute angle formed by the reference axis orthogonal to the vertical central axis of the head and parallel to the wall surface and the longitudinal central axis of the tip of the needle is a predetermined angle. Is the direction to have. Therefore, the needle portion is expanded from the tip end to the base end portion in the wall surface. Therefore, the stud of the present invention can sufficiently widen the base end portion of the needle and make it difficult for the needle to come off the wall surface.

Of the studs according to the embodiment of the present invention, (a) is a perspective view, (b) is an enlarged view of the tip of a needle, and (c) is an enlarged view of the tip of one needle. (A) is a plan view and (b) is a side view of the stud according to the embodiment of the present invention. It is explanatory drawing of the shape of the tip part of the needle which concerns on embodiment of this invention. It is explanatory drawing of the movement when the needle which concerns on embodiment of this invention is inserted into a wall surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, the top and bottom are as shown in FIG. 2 (b). The place and use of the stud of the present invention are not particularly limited, but the stud according to the present embodiment is used for attaching a poster or the like to a wall surface, and as shown in FIG. It is composed of a portion 1 and a needle portion 3 having three needles 2, 2 and 2. The head portion 1 and the needle portion 3 are integrated, and the lower end of the base end portion 30 of the needle portion 3 is concealed inside the head portion 1. Further, the needle portion 3 has elasticity and is made of a metal material, a resin material, or the like. The head portion 1 and the needle portion 3 are manufactured from the same metal plate or resin plate.

As shown in FIG. 2, the head 1 has a substantially circular shape in a plan view and a substantially elliptical shape in a side view. The head 1 has a flat surface portion 10 on one surface. Needles 2, 2 and 2 are erected from the center of the flat surface portion 10 of the head 1 in close contact with the flat surface portion 10 perpendicularly.

As shown in FIGS. 1 (b) and 1 (c), the needles 2, 2 and 2 of the needle portion 3 have a body portion 20 and a tip portion 24, respectively, and the tip portion 24 has an inner side surface 21. It has a sharp shape consisting of outer surfaces 22 and 23. The body portion 20 is a portion from below the tip portion 24 of the needle 2 to the base end of the needle 2, and is prismatic. The inner side surface 21 and the outer side surfaces 22 and 23 are flat surfaces, and each has a substantially rectangular shape.

Next, the shape of the tip portion 24 of the needle 2 will be described. The tip 24 of the needle 2 has a sharpened shape, and the sharpened shape has a triangular pyramid shape T having triangular side surfaces S1, S2 and S3 and a bottom surface S4 having a regular triangular shape, as shown in FIG. Is tilted in a predetermined direction by incrementing a predetermined angle. In the following description of the inclination of the regular triangular pyramid shape T, and in FIGS. 3 (a), (b), and (c), the body portion 20 of the needle 2 is referred to as the tip portion of the needle 2 for the purpose of simplifying the description. It is described as a rectangular pillar separate from 24. In the original embodiment, the body portion 20 of the needle 2 is integrated with the tip portion 24 of the needle 2 as shown in FIGS. 1, 2, 3 (d) and 4.

As shown in FIG. 3A, the sharpness coincides with the longitudinal central axis CT of the regular triangular pyramid shape T and the longitudinal central axis C2 of the body portion 20. From the position, as shown in FIG. 3B, the apex V2 of the regular triangular pyramid shape T and the corner portion 20c of the body portion 20 are tilted in the predetermined direction while being aligned with each other. In other words, as shown in FIGS. 3A and 3B, the sharpened shape is orthogonal to the perpendicular line PT including the apex V2 of the bottom surface S4 of the regular triangular pyramid shape T, and is orthogonal to the apex V2 of the regular triangular pyramid shape T. The regular triangular pyramid shape T is rotated in the predetermined direction by an increment of the predetermined angle around the axis of the axis R0, which is the axis including the above.

As shown in FIGS. 3A and 3B, the predetermined direction is the ridge line LT of the regular triangular pyramid shape T including the apex V2 and the side L20c of the body portion 20 including the corner portion 20c. This is the direction in which the angle θ formed increases. The predetermined angle increment is the angle of the increment of the angle θ before and after the inclination or rotation of the regular triangular pyramid shape T, and the angle of the increment is larger than 0 degrees and less than 17.6 degrees. is there. When the angle of the increment is 17.6 degrees or more, the needle 2 bends and expands in the wall surface.

On the other hand, FIG. 3 (c) is a plan view of the front and back of the inclination or rotation of the regular triangular pyramid shape T. Both before and after the inclination or the rotation, the apex V2 of the regular triangular pyramid shape T and the corner portion 20c of the body portion 20 of the needle 2 overlap in a plan view, and the apex V4 of the regular triangular cone shape T is a regular three. It overlaps with the ridgeline LT of the triangular cone shape T in a plan view.

Up to this point, the body portion 20 of the needle 2 has been described as a rectangular pillar separate from the tip portion 24 of the needle 2 for the purpose of simplifying the explanation, but in the original embodiment, it is shown in FIG. 3 (d). As you can see, the body 20 of the needle 2 is integrated with the tip 24 of the needle 2. As shown in FIG. 3D, the inner side surface 21 is flush with the triangular side surface S1 after the inclined or rotated regular triangular pyramid shape T. Similarly, as shown in FIG. 3D, the outer surfaces 22 and 23 are flush with the triangular side surfaces S2 and S3 after the inclined or rotated triangular pyramid shape T, respectively.

Subsequently, the movement of the needle 2 when the needle portion 3 is inserted into the wall surface will be described. Here, it is described that the needle 2 is inserted upward into the wall surface W of the ceiling. As shown in FIG. 4A, the needles 2 are erected so as to be in contact with each other at the corners 20a of the respective body portions 20.

First, the force applied to the tip 24 of the needle 2 from inside the wall surface W will be described. As shown in FIG. 4B, when the needle 2 is viewed in a plan view, the angle formed by the force P1 applied to the inner surface 21 and the forces P2 and P3 applied to the outer surfaces 22 and 23 from the inside of the wall surface W is 120 degrees, respectively. Is. However, each arrow indicating a force in FIG. 4 is for the sake of simplification of explanation, and roughly represents the magnitude and direction of the force.

Based on FIG. 4B, a force applied to the tip portion 24 of the needle 2 from inside the wall surface W in a plan view of the needle 2 will be described. In a plan view, the portion of the force P2 in the direction parallel to the direction of the force P1 is the force P21, and the component in the direction orthogonal to the direction of the force P1 and parallel to the force P3 is the force P23. Is. Similarly, in a plan view, the component of the force P3 in the direction parallel to the direction of the force P1 is the force P31, which is orthogonal to the direction of the force P1 and is a component in the direction parallel to the force P2. Is the force P32. In a plan view, the force P23 and the force P32 are in a balanced relationship.

On the other hand, in the side view of the needle 2, as shown in FIG. 4C, the force P1 applied to the inner side surface 21 from inside the wall surface W is slightly downward, and the forces P2 and P3 applied to the outer surfaces 22 and 23. Is almost horizontal.

Next, the force applied from the needle 2 into the wall surface W when the needle 2 is inserted into the wall surface W, and the movement of the needle 2 in the wall surface W will be described. As shown in FIG. 4D, when the needle 2 is inserted perpendicularly to the wall surface W, a force P0 for inserting the needle 2 into the wall surface W is applied from the needle 2 into the wall surface W. Therefore, the needle 2 goes straight through the wall surface W perpendicularly to the wall surface W. A wall surface insertion space SP is formed on the wall surface W by the straight movement of the needle 2. The wall surface insertion space SP is a space having a slight width in a direction orthogonal to the wall surface W and having the same width as the needle 2 in a direction parallel to the wall surface W.

The movement of the needle 2 in the wall surface W after the wall surface insertion space SP is formed will be described. As shown in FIGS. 4 (e) and 4 (f), after the wall surface insertion space SP is formed, the needle 2 bends under a force from the inside of the wall surface W, and the central axis C1 in the vertical direction of the head 1 The reference axis RW, which is inclined diagonally away from the head 1, that is, orthogonal to the vertical central axis C1 of the head 1 and parallel to the wall surface W, and the central axis of the needle 2 in the longitudinal direction on the tip end side of the body 20. The sharp angle γ formed by C24 has a predetermined angle, and the needle 2 travels straight in the wall surface W in the direction D having the predetermined angle. Therefore, each of the needles 2, 2 and 2 spreads radially, and the needle portion 3 expands. The predetermined angle of the angle γ is greater than 0 degrees and less than 72.4 degrees. When the predetermined angle of the angle γ is 72.4 degrees or more, the radial spread of each needle 2, 2 and 2 is small, that is, the needle 2 is easily pulled out because the spread of the needle portion 3 is small. ..

In order to further explain the movement of the needle 2 in the wall surface W after the wall surface insertion space SP is formed, a force applied to the needle 2 from inside the wall surface W after the wall surface insertion space SP is formed. The force applied from the needle 2 into the wall surface W will be described. As shown in FIG. 4E, in the side view of the needle 2, the force P0 at which the needle 2 is inserted into the wall surface W is in the same direction as the central axis C24 in the longitudinal direction on the tip end side of the body 20 of the needle 2. The component of is the force P02, and the component in the direction orthogonal to the force P02 is the force P00. The force P01 balances with the force P24, which is a component in the same direction as the force P01, among the forces applied to the tip 24 of the needle 2 from the wall surface. Here, only the side view and description of one side surface are shown, but similarly, in the side view of the other side surface, the force P01 is the same as the force P01 among the forces from the wall surface applied to the needle 2. Balanced with the force of the directional component. As a result of the equilibrium, the force P02 of the component in the direction parallel to the central axis C24 remains, and the needle 2 goes straight in the wall surface W in the direction parallel to the central axis C24, that is, in the direction D.

According to the stud 100 of the present embodiment configured in this way, when each of the needles 2, 2 and 2 included in the needle portion 3 is inserted into the wall surface, each of the needles 2, 2 and 2 goes straight through the wall surface perpendicularly to the wall surface W. As a result of the straight movement, wall surface insertion spaces SP, SP, and SP having a slight width in the direction orthogonal to the wall surface W and having the same width as the needle 2 in the direction parallel to the wall surface W are formed. After formation, each of the needles 2, 2 and 2 bends by receiving a force from the inside of the wall surface and tilts diagonally away from the central axis C1 in the vertical direction of the head 1, that is, the top and bottom of the head 1. The sharp angle γ formed by the reference axis RW orthogonal to the central axis C1 in the direction and parallel to the wall surface W and the central axis C24 in the longitudinal direction on the tip end side of the body portion 20 of the needle 2 has a predetermined angle. Then, each of the needles 2, 2, and 2 goes straight in the wall surface in the directions D, D, and D having the predetermined angles. Therefore, the needle portion 3 is expanded from the tip end portion to the base end portion 30 in the wall surface. Therefore, in the stud 100 of the present invention, only the needle portion 3 is inserted into the wall surface or the like, the base end portion 30 of the needle portion 3 is sufficiently expanded, and the needle portion 3 can be made difficult to come off from the wall surface. Further, since the wall surface insertion spaces SP, SP, and SP formed when the needles 2, 2 and 2 are inserted are close to each other, the holes drilled in the wall surface W are at substantially the same position and are opened in the wall surface W. Since only one hole is required, it has excellent design.

When the regular triangular pyramid shape T is a regular tetrahedron, it is desirable that the base angles α of the triangular side surfaces S1, S2, and S3 shown in FIG. 3 are 53 degrees or more and 70.5 degrees or less. When the angle α is less than 53 degrees, the sharpness of the tip of the needle 2 is insufficient, and the needle 2 is difficult to be inserted into the wall surface. On the other hand, when the angle α is larger than 70.5 degrees, the tip of the needle 2 becomes excessively sharp and difficult to expand in the wall surface. On the other hand, when the regular triangular pyramid shape T is not a regular tetrahedron, the base angle of the triangular side surfaces S1, S2, S3 depends on the length between the bottom surface of the regular triangular pyramid shape T and the apex V4 with respect to the total length of the needle 2. The desired angle is determined.

The present invention is not limited to the above embodiment, and can be appropriately modified as long as it is within the scope of the claims. The needle may be, for example, a substantially triangular plane view. The number of needles may be two or four or more. The needles may or may not be in contact with each other, for example, in the lateral direction. The head may have, for example, a shape provided with a hook. The head portion and the base end portion of the needle portion may be integrated by welding, for example.

100 Tack 1 Head 10 Flat surface 2 Needles 20 Body 20c Square L20c Side 21 Inner surface (flat surface)
22,23 Outer surface (flat surface)
24 Tip 3 Needle T Elongated triangular pyramid shape V2 Vertex LT Ridge CT, C2 Central axis θ Angle S1, S2, S3 Side surface α Base angle

Claims (3)

A head portion and a needle portion having a plurality of needles are provided, and the head portion has a flat surface portion on one surface, and each of the needles has a body portion and a tip portion, and the flat surface portion of the head portion is provided. It is erected in close contact with the flat surface portion perpendicularly to the flat surface portion, the body of each of the needles is prismatic, and the tip of each of the needles is sharpened with three flat surfaces. The shape is such that one apex of the regular triangular pyramid shape and the trunk portion are formed from a position where the regular triangular pyramid shape coincides with the central axis of the regular triangular pyramid shape in the longitudinal direction and the central axis of the body portion in the longitudinal direction. It is inclined in a predetermined direction while keeping one corner portion coincident, and the predetermined direction includes the regular triangular pyramid-shaped ridge line including the apex and the side of the body portion having the corner portion. A stud that increases the angle formed by the stud, and the angle of the angle is incremented by a predetermined angle due to the inclination. The stud according to claim 1, wherein the angle increment of the angle is greater than 0 degrees and less than 17.6 degrees. The stud according to claim 1, wherein the regular triangular pyramid shape is a regular tetrahedron, and the base angle of the side surface of the regular triangular pyramid shape is 53 degrees or more and 70.5 degrees or less. Tack to do.

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