Chopsticks
Chopsticks with a D-shaped cross section near the head form a heart shape when placed together, addressing the lack of etiquette-promoting designs and encouraging proper placement and mindful eating.
Patent Information
- Application Number
- JP2024058394
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-31
- Publication Date
- 2025-10-14
AI Technical Summary
Existing chopsticks do not encourage users to place them together, which is considered good etiquette, and there is a lack of designs that visually promote this behavior.
Designing chopsticks with a D-shaped cross section near the head, allowing them to form a heart shape when placed side by side, encouraging proper placement.
Encourages users to place chopsticks together, promoting good dining etiquette and potentially increasing the use of palate cleansers, leading to slower and more mindful eating habits.
Smart Images

Figure 2025155066000001_ABST
Abstract
Description
[Technical Field]
[0001] Regarding chopsticks used for eating. [Background technology]
[0002] Providing chopsticks with heart-shaped tips when placed side by side would encourage people to place their chopsticks side by side, but no such chopsticks have been seen. [Prior art documents] [Non-patent literature]
[0003] [Non-Patent Document 1] Design Registration No. 1707868 Summary of the Invention [Problem to be solved by the invention]
[0004] To provide chopsticks whose cross section near the head is D-shaped, and whose heads look heart-shaped when the pair of chopsticks are placed together with the straight line part (flat part) of the D-shaped cross section aligned.
[0005] When preparing your chopsticks or when you want to rest them during a meal, it is good etiquette to place both chopsticks together on the chopstick rest, which leads to beautiful dining behavior. Previously, there were chopsticks with a single chopstick tip shaped like a heart, but this did not encourage people to place their chopsticks together. This invention is designed so that two chopsticks together form a heart shape, naturally encouraging people to place their chopsticks together. [Means for solving the problem]
[0006] The present invention relates to chopsticks in which the cross section near the head of each chopstick is D-shaped and there is a plane including a straight line portion of the cross section. When two chopsticks are placed side by side on a flat surface such as a tabletop (hereinafter referred to as "table") with their flat surfaces touching, with the tips facing left and the heads facing right, the side of the handle of the top chopstick, near the head, is: A virtual plane parallel to the chopstick plane rotates counterclockwise at an angle of 25° to 65° around an axis perpendicular to the table on the table, and is cut by a virtual inclined plane tilted at an elevation angle of 25° to 65° toward the upper left side of the plan view.
[0007] Next, the other chopstick, which is located below in plan view when the chopstick head is placed facing right, is cut on an inclined plane that is plane-symmetrical to the plane of the chopstick. This cutting process results in a heart-shaped cut surface at the top of the chopsticks when the chopsticks are placed flat.
[0008] The term "D-shape" refers to a shape that has a straight line in one part, with both ends of the line connected by an approximately semicircular curve, and has an overall aspect ratio of approximately 1:1, but it also includes shapes that are not symmetrical from top to bottom and shapes that are somewhat flattened.
[0009] Also, "hashisaki" refers to the tip of the chopsticks that you use to hold food, "hashito" refers to the tip of the handle, "mochishiro" refers to the part of the chopsticks you hold, and "tsukaishiro" refers to the rest of the chopsticks. The "side of chopsticks" refers to the surface of the handle and chopstick tip, excluding the tip and head. The "chopstick plane" is the plane of the chopstick side that includes the straight part of the D-shaped cross section mentioned above, and is the plane that stands perpendicular to the table.
[0010] In addition, the present invention has a cross-sectional shape near the head of each chopstick that is D-shaped and curved. The D-shaped curved portion is deformed so that the vertex 1-8 of the D-shaped curved portion is lowered and the curved portion is lower than the bottom end of the straight portion by about 1 / 10 to 2 / 10 of the length of the straight portion (hereinafter referred to as "deformed D-shaped"), In chopsticks having a plane including a straight portion of the cross-sectional shape, When two chopsticks are placed side by side on a table with their flat surfaces touching, with the tip facing left and the head facing right, the side of the handle of the top chopstick, near the head, is: A virtual plane parallel to the chopstick plane rotates at an angle of 25° to 90° around an axis perpendicular to the table on the table, and is cut by a virtual inclined plane tilted at an elevation angle of 25° to 65° toward the left or upper left side of the plan view.
[0011] Next, the other chopstick, which is located below in plan view when the chopstick head is placed facing right, is cut on an inclined plane that is plane-symmetrical to the plane of the chopstick. This cutting process results in a heart-shaped cut surface at the top of the chopsticks when the chopsticks are placed flat. [Effects of the Invention]
[0012] When the chopsticks of this invention are placed with the flat surfaces of two chopsticks together, the heads of the chopsticks look heart-shaped, encouraging people to place their chopsticks together, which is in line with good manners and leads to beautiful eating habits. Furthermore, it is expected that this will increase the number of palate cleansers, which will ultimately lead to the habit of eating slowly. [Brief explanation of the drawings]
[0013] [Figure 1] Three-dimensional diagram of typical chopsticks [Figure 2] Three-view drawings of one embodiment of the present invention (Example 1) [Figure 3] Enlarged view of part of Figure 2 [Figure 4] Deformed D-shape diagram [Figure 5] Three-view drawings of an embodiment of the present invention (Embodiment 2) DETAILED DESCRIPTION OF THE INVENTION
[0014] Figure 1 is a three-view diagram showing the names and explanations of the parts of typical chopsticks. A: Plan view, B: Front view, D: Right side view, E: Left side view The chopsticks are shown shorter than regular chopsticks to make them easier to illustrate. It also refers to a pair of chopsticks placed side by side on a table. Normally they are placed close together, but here they are shown with a small gap between them for ease of understanding. Also, although table 2 and chopsticks 1 are touching, they are depicted with a small gap between them for clarity. [Example]
[0015] FIG. 2 is a three-view diagram showing chopsticks according to an embodiment of the present invention. A: Plan view, B: Front view, C: Front view with the bottom chopstick removed from the plan view, D: Right side view (D2: Right side view of the "D-shape" shaped like an ellipse cut in half, D3: Right side view of the "D-shape" shaped like a truck ellipse cut in half (not shown in the other three views)), E: Left side view, G: Cross section (view from right to left. The cut part is located at the dashed line)
[0016] The pair of chopsticks 1 is placed on the table 2 with the tip 1-1 facing left and the head 1-5 facing right. The side 1-3 of the handle 1-4 of the top chopstick, which is located near the head 1-5, is An imaginary plane parallel to the chopstick plane 1-7 rotates counterclockwise around an axis perpendicular to the table 2 at a rotation angle of 45° 3X on the table 2, and is then cut by an imaginary inclined plane 3 tilted at an elevation angle of 45° 3Y toward the upper left side of the plan view (elevation angle direction 3-1) with respect to the table 2. At this time, the chopstick head 1-5 before cutting is not included.
[0017] Next, when the chopstick head 1-5 is placed to the right, the other chopstick located below in the plan view is cut by an imaginary inclined plane 3 that is plane-symmetrical to the chopstick plane 1-7. This cutting creates a heart shape on the slanted chopstick head 1-6 when the pair of chopsticks are placed with their flat surfaces aligned.
[0018] FIG. 3 is an enlarged view of the right side portion of FIG.
[0019] Furthermore, when D-shaped chopsticks, which are an oval cut in half, are placed on table 2 with the chopstick flat surfaces 1-7 aligned, the center of gravity of the chopsticks is near the center of the curved part 1-8 of the D shape, so they will fall toward the curved part 1-8 on the D side, with the lower end of the straight part 1-71 of the D shape as the fulcrum. However, by making the cross-sectional shape of the chopstick handle 1-2 square and placing it on a chopstick rest, it can be made less likely to fall. [Example]
[0020] FIG. 4 is an explanatory diagram of a modified D-shape according to another embodiment. A: Head 1-5 of D-shaped chopsticks before deformation. B: Head 1-5 of deformed D-shaped chopsticks with the curved part 1-9 of the D-shape lowered and the curved part 1-8 of the D-shape deformed. This shows that the D-shaped curved portion apex 1-9 is lowered, and the D-shaped curved portion 1-8 is deformed so that it is lower than the lower end of the straight portion 1-71 of the D-shaped by about 1 / 10 to 2 / 10 of the length of the straight portion 1-71.
[0021] FIG. 5 is a three-view diagram showing modified D-shaped chopsticks according to another embodiment of the present invention. A: Plan view, B: Front view, C: Front view with the bottom chopstick removed from the plan view, D: Right side view (D2: Right side view of the "modified D-shaped chopstick" created by cutting an ellipse in half, D3: Right side view of the "modified D-shaped chopstick" created by cutting an ellipse in half (not shown in the other three views)), E: Left side view, G: Cross section (view from right to left. The cut part is located at the dashed line)
[0022] When a pair of chopsticks 1 is placed on a table 2 with the tip 1-1 facing left and the head 1-5 facing right, the side 1-3 of the handle 1-4 of the top chopstick, which is close to the head 1-5, An imaginary plane parallel to the chopstick plane on the table 2 rotates counterclockwise around an axis perpendicular to the table 2 at a rotation angle of 3X 90°, and is then cut by an imaginary inclined plane 3 tilted at an elevation angle of 3Y 33° toward the upper left side of the plan view (elevation angle direction 3-1). The chopstick head 1-5 before cutting is not included in this cut.
[0023] Next, when the chopstick head 1-5 is placed to the right, the other chopstick located below in the plan view is also cut by the chopstick imaginary inclined plane 3. This cutting creates a heart shape on the slanted chopstick head 1-6 when the pair of chopsticks are placed with their flat surfaces aligned. [Explanation of symbols]
[0024] 1 pair of chopsticks 1-1 Tip of chopsticks 1-2 Usage allowance 1-3 Side of chopsticks 1-4 Possession 1-5 Chopstick head 1-6 Sloped chopstick head 1-7 Chopstick plane 1-71 D-type straight section 1-8 D-shaped curved section 1-9 D-shaped curved section apex 2. Table (tabletop or other flat surface) 3 Virtual Inclined Plane 3-1 Elevation direction 3-X rotation angle 3-Y elevation
Claims
[Claim 1] The cross section of each chopstick near the tip is D-shaped, and there is a plane that includes a straight line in the cross section. When two chopsticks are placed on a flat surface such as a table top with the tips facing left and the heads facing right, In the plan view, the side of the chopsticks near the tip of the handle of the top chopstick is A virtual plane on the table that is parallel to the chopstick plane is rotated counterclockwise around an axis perpendicular to the table by an angle of 25° to 90°, and is cut by a virtual inclined plane that is tilted at an elevation angle of 25° to 65° toward the upper left side of the plan view. Next, when the chopsticks are placed with the head facing to the right, the other chopstick located below in a plan view is cut by an imaginary inclined plane that is plane-symmetrical to the plane of the chopsticks.
Citation Information
Patent Citations
chopsticks
JP1707868S