Needleless stapler

Abstract

The present invention provides a needleless drawing pin that can be used safely even if the drawing pin comes off after using the drawing pin. 【Solution means】 A needleless drawing pin having a hemispherical head, a plate-shaped flange portion in contact with the hemispherical surface of the head, and a cylindrical tube penetrating the head and the flange portion in the central axis direction of the hemisphere of the head, The inner diameter of the tube is larger than the outer diameter of the needle of the drawing pin to such an extent that the needle of the drawing pin with a needle attached to the center of a plastic head or a metal disc can be inserted, Moreover, the length of the tube is such that the needle of the drawing pin is inserted from the opening of the tube on the head side and protrudes from the bottom side of the tube.

Description

Technical Field

[0001] This invention relates to a thumbtack without a needle that can be used safely even if the thumbtack comes off the wall.

Background Art

[0002] In an environment where there are young children such as kindergartens, nurseries, and elementary schools, if a thumbtack is used to fix a posted item and the thumbtack falls off, there is a risk that a child may step on it and get injured. Among existing products that solve this problem, there are some that are designed so that the needle does not point upward when dropping by making the head part of the thumbtack spherical. However, children may deliberately remove the thumbtack from the bulletin board and use it as a toy, and in this case, the above-mentioned products are dangerous. As a countermeasure, there are also thumbtacks that have a cover to protect the sharp needle at the tip of the conventional thumbtack.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By eliminating the sharp needle at the tip of the conventional thumbtack, a thumbtack without a needle that can be used relatively safely even in an environment with many children is provided.

Means for Solving the Problems

[0005] The thumbtack without a needle according to the first invention for achieving the above object is a thumbtack without a needle having a hemispherical head made of resin and a cylindrical tube penetrating the head in the central axis direction of the hemisphere of the head, The inner diameter of the cylinder is approximately 1.5 mm, the wall thickness of the cylinder is approximately 0.3 mm, and the length of the cylinder is approximately 22 mm. At the same time, The inner diameter of the tube is larger than the outer diameter of the needle of a thumbtack with a needle attached to the center of a plastic head or a metal disc so that the needle of the thumbtack can be inserted, Moreover, the length of the cylinder is such that the needle of the thumbtack is inserted through the opening of the cylinder on the head side and protrudes from the bottom side of the cylinder.

[0006] The thumbtack without a needle according to the second invention is the thumbtack without a needle according to claim 1, wherein the cylinder is made of a flexible resin.

[0007] The thumbtack without a needle according to the third invention is the thumbtack without a needle according to claim 1 or claim 2, wherein the wall thickness of the cylinder is smaller than the outer diameter of the needle of the thumbtack.

[0008] The thumbtack without a needle according to the fourth invention is the thumbtack without a needle according to claim 3, and has a plate-shaped flange portion of a regular polygon in contact with the hemispherical surface of the head , the head is in a hemispherical shape with a radius of approximately 6 mm, and the flange portion is a regular hexagon with a side length of approximately 7 mm in plan view .

Advantages of the Invention

[0009] In the first invention, since a commercially available thumbtack needle or the like is inserted into the cylinder of the thumbtack without a needle, and after the thumbtack without a needle is inserted into a wall or the like, only the commercially available thumbtack or the like is removed and used, the thumbtack without a needle itself is in a state without a needle, so it can be used safely even if it comes off the wall.

[0010] In the second invention, since the cylinder is made of a flexible resin, it has elasticity and the possibility of piercing the human body is lower, so it can be held safely.

[0011] In the third invention, since the wall thickness of the cylinder is smaller than the outer diameter of the thumbtack needle, it becomes easier to insert when used by inserting it into a wall or the like.

[0012] In the fourth invention, since it has a plate-shaped flange portion of a regular polygon in contact with the hemispherical surface of the head, even if the thumbtack without a needle comes off the wall, it can be prevented that the head rotates and rolls due to the flange portion.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Embodiments of the present invention will be described based on FIGS. 1 to 3.

[0015] FIG. 1 is a perspective view of a needleless drawing awl 10. First, there is a hemispherical head 11. Here, the head 11 is made of resin. And a regular hexagonal plate-shaped flange portion 12 in contact with the hemispherical surface of the head 10 is provided. In a plan view, the diameter of the hemisphere of the head 11 is the inscribed circle of the flange 12. Next, a cylindrical tube 13 penetrating the head 10 in the central axis direction of the hemisphere of the head 10 is provided. Naturally, the tube 13 also penetrates the flange 12. Further, the flange 12 and the tube 13 are also made of resin. As the material, a resin that is easy to mold is good. If it is resin, it is flexible when made into a tube and can be bent, so it does not pierce the human body and is safe. Appropriate flexibility can be ensured.

[0016] Next, the flange 12 is hemispherical with a radius of 6 mm. Next, the flange portion 12 is a regular hexagon with a side length of 7 mm in a plan view and a thickness of 1.2 mm. And the inner diameter of the tube 13 is 1.5 mm, the outer diameter is 1.8 mm, and the length is 22 mm.

[0017] FIG. 2 is a plan view of the needleless drawing awl 10. The diameter of the hemisphere of the head 11 is the inscribed circle of the flange 12. A cylindrical tube 13 penetrating the head 10 in the central axis direction of the hemisphere of the head 10 is provided. The flange portion 12 is in the shape of a regular hexagonal plate, but if it is a regular polygon, it may be a quadrilateral, an octagon, a decagon, etc. With this flange 12, even when the needleless drawing awl 10 is lying down, rotation can be prevented around the tip of the tube 13.

[0018] Figure 3 is a side view of the needleless drawing pin 10. A hexagonal plate-shaped flange portion 12 in contact with the hemispherical surface of the head portion 10 is provided. Note that the diameter of the hemisphere of the head portion 11 is the inscribed circle of the regular hexagon-shaped flange 12. A cylindrical tube 13 penetrating the head portion 10 and the flange portion 11 in the central axis direction of the hemisphere of the head portion 10 is provided. The length of the tube is approximately 22 mm.

[0019] Figure 4 is an explanatory diagram showing the usage state of the needleless drawing pin 10. Here, the needle 22 of a commercially available drawing pin 20 (a drawing pin with a needle attached to the center of a metal disc, and there is also a drawing pin with a plastic head not shown) is inserted through the tube 13 on the upper surface of the head portion 10 of the needleless drawing pin 10. And the tip of the needle 22 protrudes from the other end of the tube 13. In this state, the user presses the top plate 21 of the drawing pin 20 with a finger and inserts the drawing pin 20 together with the needleless drawing pin 10 into a board (not shown). Then, when the insertion of the needle 22 and the tube 13 into the board is completed, hold the top plate 21 of the drawing pin 20 and pull out the drawing pin 20. Then, the needleless drawing pin 10 remains stuck to the board. So, if a posting (paper) was inserted together at this time, the remaining posting will be held on the board by this needleless drawing pin 10. Also, even if the needleless drawing pin portion 10 comes off the board and rolls on the floor at a later date, the tube 13 is safe because its tip is not sharp. Furthermore, because of the flange portion 12, it is difficult to roll on an inclined floor and is less likely to be lost.

Industrial Applicability

[0020] The present invention can be applied to products related to a needleless drawing pin that safely holds postings.

Explanation of Reference Numerals

[0021] 10: Needleless drawing pin, 11: Head portion, 12: Flange portion, 13: Tube, 20: Drawing pin, 21: Top plate, 22: Needle

Claims

1. A pinless thumb tack having a semi-spherical resin head and a cylindrical tube passing through the head in the direction of the central axis of the semi-spherical head, The inner diameter of the cylinder is approximately 1.5 mm, the wall thickness of the cylinder is approximately 0.3 mm, and the length of the cylinder is approximately 22 mm. The inside diameter of the cylinder is larger than the outside diameter of a pin of a thumb tack having a plastic head or a metal disk at the center thereof so that the pin can be inserted into the tube. Moreover, the length of the tube is such that the needle of the thumb tack is inserted through the opening of the tube on the head side and protrudes from the bottom side of the tube.

2. 2. The pinless thumb tack according to claim 1, wherein the tube is made of a flexible resin.

3. 3. The pinless thumb tack according to claim 1 or 2, wherein the wall thickness of the tube is smaller than the outer diameter of the pin of the thumb tack.

4. The pinless thumb tack according to claim 3, characterized in that it has a regular polygonal plate-shaped flange that is in contact with the hemispherical surface of the head, the head being hemispherical with a radius of approximately 6 mm, and the flange being a regular hexagon with a side length of approximately 7 mm in a plan view.

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