Curve drawing flexible rule and curve drawing device

Abstract

The invention relates to the field of teaching plotting, and provides a curve plotting flexible rule and a curve plotting device.The curve plotting flexible rule comprises a flexible rule body, and the flexible rule body is of a structure with the strength gradually weakened from the two ends to the middle. The strength of the curve drawing flexible rule is gradually weakened from the two ends to the middle; the strength of the curve drawing flexible rule is gradually weakened from the two ends to the middle, so that when the curve drawing flexible rule is positioned in the middle to form a vertex of a curve, and when the positions on the two sides of the middle are respectively positioned, the closer to the middle, the strength is reduced, and the closer to the middle, the closer to the middle, the more easily formed by the positioning point and the curvature is increased. Therefore, the problem that in the prior art, when a flexible rule is used for making a curve through a specific point, the precision is not high can be solved.

Description

[0001] Case information

[0002] This application is a divisional application of Chinese patent application No. 201811441183.5, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a teaching drawing tool, and more particularly to a curve drawing ruler and a curve drawing device. Background Technology

[0004] In the process of drawing curves, the user will determine several specific points, and then bend the measuring tape at these specific points to form the desired curve. Taking Chinese patent CN106739686A as an example, this patent discloses a teaching drawing tool, specifically a method for creating curves including parabolas by fixing five points. However, it is not difficult to find in the process of use that most parabolas have a large curvature around the vertex, and the existing measuring tape cannot be bent into the curve around the vertex of the parabola. Even with external force, it is difficult to make it. Therefore, the accuracy is not high when drawing the curve around the vertex of the parabola. Summary of the Invention

[0005] The inventors analyzed existing flexible measuring tapes that use fixed points to bend curves and found that the main problem affecting the accuracy of the curves is that the curvature of the curve (parabola) increases as it approaches the vertex. However, because existing flexible measuring tapes have uniform strength throughout their length, it is difficult to achieve a greater curvature closer to the vertex when bending them; instead, the curvature tends to decrease as it approaches the vertex. Therefore, this invention provides a flexible measuring tape for curve drawing and a curve drawing device to improve the low accuracy of existing flexible measuring tapes when creating curves through fixed points.

[0006] The present invention provides a curved drawing ruler, including a ruler body, wherein the ruler body is configured such that the strength gradually decreases from both ends toward the middle, so that the strength of the curved drawing ruler gradually decreases from both ends toward the middle.

[0007] Preferably, the thickness of the measuring tape body gradually decreases from both ends towards the middle, so that the strength of the measuring tape body weakens from both ends towards the middle; or,

[0008] The width of the measuring tape body gradually narrows from both ends towards the middle, so that the strength of the measuring tape body gradually decreases from both ends towards the middle; or,

[0009] The measuring tape body has multiple openings arranged along its length. The opening area gradually increases from both ends towards the center, thus reducing the strength of the measuring tape body from both ends towards the center; or...

[0010] The measuring tape body has at least one long side with multiple notches, and the area of ​​the multiple notches on the same long side gradually increases from both ends of the measuring tape body toward the middle.

[0011] Preferably, the plurality of openings are arranged in a row along the length of the measuring tape body, and the area of ​​the openings gradually increases in the direction near the middle of the measuring tape body.

[0012] Preferably, the plurality of openings are arranged in two rows along the length of the metal sheet, and the two rows of openings are respectively located near the two long sides of the metal sheet. In the direction near the middle of the metal sheet, the area of ​​the openings in the same row gradually increases, so that the strength of the metal sheet gradually weakens from both ends toward the middle.

[0013] Preferably, the plurality of openings are arranged in an elliptical, square, or irregular shape.

[0014] Preferably, the measuring tape body has graduation lines.

[0015] Preferably, the curve drawing ruler is further covered with an outer layer made of elastic material, and the outer layer is configured to wrap around the main body of the ruler;

[0016] The main body of the measuring tape is a metal sheet.

[0017] Preferably, the outer layer is made of TPU or silicone.

[0018] Preferably, the outer layer has graduation lines; or, the outer layer is transparent and the main body of the measuring tape has graduations.

[0019] The present invention also provides a curve drawing device, including a curve drawing ruler. The curve drawing ruler includes a ruler body, which is configured to gradually weaken in strength from both ends toward the middle, so that the strength of the curve drawing ruler gradually weakens from both ends toward the middle.

[0020] The invention has the following effects: the strength of the curved drawing ruler gradually weakens from both ends toward the middle. Therefore, the vertex of the curve is positioned at the middle, and when the two positions on either side of the middle position are positioned respectively, the strength becomes smaller closer to the middle position, and it is easier to be shaped by the positioning point and bend into a larger curvature. This can improve the problem of low accuracy of the ruler in the prior art when making curves through specific points. Attached Figure Description

[0021] Figure 1 A front view schematic diagram of the first embodiment of the first set of curve drawing rulers provided by the present invention;

[0022] Figure 2 A front view schematic diagram of a second embodiment of the first set of curve drawing rulers provided by the present invention;

[0023] Figure 3 A front view schematic diagram of the third embodiment of the first set of curve drawing rulers provided by the present invention;

[0024] Figure 4 A front view schematic diagram of the fourth embodiment of the first set of curve drawing rulers provided by the present invention;

[0025] Figure 5 A side view schematic diagram of the fifth embodiment of the first set of curve drawing rulers provided by the present invention;

[0026] Figure 6 A side view diagram after sectional cutting of a second embodiment of the curve drawing ruler provided by the present invention;

[0027] Figure 7 A front view schematic diagram of the first embodiment of the second set of curve drawing rulers provided by the present invention;

[0028] Figure 8 A front view schematic diagram of a second embodiment of the second set of curve drawing rulers provided by the present invention;

[0029] Figure 9 A front view schematic diagram of the third embodiment of the second set of curve drawing rulers provided by the present invention;

[0030] Figure 10 A front view schematic diagram of the fourth embodiment of the second set of curve drawing rulers provided by the present invention;

[0031] Figure 11 A side view schematic diagram of the fifth embodiment of the second set of curve drawing rulers provided by the present invention;

[0032] Figure 12 for Figure 1 or Figure 6A diagram illustrating the bending of a measuring tape when drawing curves. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0034] Figures 1 to 5 This is a first embodiment of the curve drawing ruler 100 provided by the present invention. Figures 6 to 11 The second embodiment of the curve drawing ruler 100 provided by the present invention is described below with reference to the specific drawings:

[0035] Please see Figures 1 to 5 The curve drawing ruler 100 includes a ruler body 10, which is configured to gradually weaken in strength from both ends toward the middle, so that the strength of the curve drawing ruler 100 gradually weakens from both ends toward the middle.

[0036] The strength of the curved drawing ruler 100 is set to gradually weaken from both ends toward the middle. Therefore, when the vertex of the curve is positioned at the middle position, and the positions on both sides of the middle position are respectively positioned, the strength becomes smaller closer to the middle position, and it is easier to be shaped by the positioning point and bend into a larger curvature. This can improve the problem of low accuracy of the ruler in the prior art when making curves through specific points.

[0037] The curve drawing ruler 100 may consist only of the ruler body 10, or it may include other structures. The ruler body 10 may be a single component or a combination of several components, which is not limited here. Furthermore, the material of the ruler body 10 is not limited and may be metal, soft rubber, silicone, etc. Preferably, the curve drawing ruler 100 consists only of the ruler body 10, and the ruler body 10 adopts a one-piece structure, which is simple in structure.

[0038] In addition, the measuring tape body 10 can also be set with scales to measure the length of curves.

[0039] There are many ways to achieve a gradual decrease in strength from both ends towards the middle of the flexible ruler body 10, which will be explained below with reference to the specific accompanying drawings:

[0040] For example, such as Figure 1 and Figure 2 As shown, the flexible measuring tape body 10 has multiple openings (10a / 10b), which are arranged along the length of the flexible measuring tape body 10. The area of ​​the openings on the flexible measuring tape body 10 gradually increases from both ends toward the middle, so that the strength of the flexible measuring tape body 10 gradually weakens from both ends toward the middle.

[0041] The shape of the plurality of openings (10a / 10b) is not limited; for example, the plurality of openings (10a / 10b) may be elliptical, square, or irregularly shaped.

[0042] Specifically, such as Figure 1 As shown, in the first embodiment of the first group provided by the present invention, the plurality of openings 10a are arranged in a row along the length direction of the flexible measuring tape body 10, and the area of ​​the openings 10a gradually increases in the direction near the middle of the flexible measuring tape body 10. In this embodiment, the openings 10a are elliptical in shape.

[0043] Specifically, such as Figure 2 As shown, in the second embodiment of the second group provided by the present invention, the plurality of openings 10b are arranged in two rows along the length direction of the flexible measuring tape body 10. The two rows of openings 10b are respectively located near the two long sides of the flexible measuring tape body 10, and the area of ​​the openings 10b in the same row gradually increases in the direction near the middle of the flexible measuring tape body 10, so that the strength of the flexible measuring tape body 10 gradually weakens from both ends toward the middle. The openings 10b are irregularly shaped.

[0044] For example, such as Figure 3 As shown, Figure 3 In the third embodiment of the first group provided by the present invention, at least one long side of the flexible measuring tape body 10 is provided with a plurality of notches 10c (specifically, in this embodiment, both long sides of the flexible measuring tape body 10 are provided with notches 10c), and the plurality of notches 10c provided on the same long side are arranged with the notch area gradually increasing in the direction from both ends of the flexible measuring tape body 10 toward the middle.

[0045] For example, such as Figure 4 and Figure 5 As shown, the strength of the flexible ruler body 10 can also be gradually reduced from both ends toward the middle by changing the width and thickness of the flexible ruler body 10:

[0046] Specifically, such as Figure 4 As shown, in the fourth embodiment of the first group provided by the present invention, the width of the soft ruler body 10 gradually narrows from both ends toward the middle, so that the strength of the soft ruler body 10 gradually weakens from both ends toward the middle.

[0047] Specifically, such as Figure 5 As shown, in the fifth embodiment of the first group provided by the present invention, the thickness of the soft ruler body 10 is gradually reduced from both ends toward the middle, so that the strength of the soft ruler body 10 is gradually weakened from both ends toward the middle.

[0048] Obviously, this design is not limited to the above embodiment. The strength of the flexible measuring tape body 10 can also be changed in other ways, such that the strength of the flexible measuring tape body 10 gradually decreases from both ends towards the middle, thereby making the flexible measuring tape body 10 more easily bent near the middle under external force. Figure 12 As shown.

[0049] Please see Figures 6 to 11 , Figures 6 to 11 The second embodiment of the curve drawing ruler provided by the present invention includes an outer layer 1 made of elastic material and a metal sheet 2. The outer layer 1 wraps around the metal sheet 2, which can be the main body 2 structure of the ruler in the first embodiment. Specifically, the metal sheet 2 is configured to gradually weaken in strength from both ends toward the middle, so that the strength of the curve drawing ruler 100 gradually weakens from both ends toward the middle.

[0050] The strength of the curved drawing ruler 100 is set to gradually weaken from both ends toward the middle. Therefore, when the vertex of the curve is positioned at the middle position, and the positions on both sides of the middle position are respectively positioned, the strength becomes smaller closer to the middle position, and it is easier to be shaped by the positioning point and bend into a larger curvature. This can improve the problem of low accuracy of the ruler in the prior art when making curves through specific points.

[0051] The material of the outer layer 1 is not limited; it can be various types of elastic rubber or other materials. Specifically, for example, the material of the outer layer is TPU or silicone. The outer layer 1 and the metal sheet 2 can be integrally formed by injection molding or other methods.

[0052] In addition, the curve drawing ruler 100 can also be set with scales to measure the length of the curve. The position of the scales is not limited. For example, the outer layer 1 is provided with scale lines; or the outer layer 1 is transparent and the metal sheet 2 is provided with scales.

[0053] The material of the metal sheet is not limited, but it is necessary to ensure that the metal sheet has good toughness and can withstand multiple bends without breaking. For example, it can be a copper sheet.

[0054] There are many ways to achieve a gradual decrease in strength from both ends toward the middle of the metal sheet 2, which will be explained below with reference to the specific accompanying drawings:

[0055] For example, such as Figure 7 and Figure 8As shown, the metal sheet 2 has multiple openings (2a / 2b), which are arranged along the length of the metal sheet 2. The opening area on the metal sheet 2 gradually increases from both ends toward the middle, so that the strength of the metal sheet 2 gradually weakens from both ends toward the middle.

[0056] The shape of the plurality of openings (2a / 2b) is not limited; for example, the plurality of openings (2a / 2b) may be elliptical, square, or irregularly shaped.

[0057] Specifically, such as Figure 7 As shown, in the first embodiment of the second group provided by the present invention, the plurality of openings 2a are arranged in a row along the length direction of the metal sheet 2, and the area of ​​the openings 2a gradually increases near the middle of the metal sheet 2. In this embodiment, the openings 2a are elliptical in shape.

[0058] Specifically, such as Figure 8 As shown, in the second embodiment of the second group provided by the present invention, the plurality of openings 2b are arranged in two rows along the length direction of the metal sheet 2. The two rows of openings 2b are respectively set close to the two long sides of the metal sheet 2, and the area of ​​the openings 2b in the same row gradually increases in the direction close to the middle of the metal sheet 2, so that the strength of the metal sheet 2 gradually weakens from both ends to the middle.

[0059] For example, such as Figure 9 As shown, Figure 9 In the third embodiment of the second group provided by the present invention, at least one long side of the metal sheet 2 is provided with a plurality of notches 2c (specifically, in this embodiment, both long sides of the metal sheet 2 are provided with notches 2c), and the notches 2c provided on the same long side are arranged with the notch area gradually increasing in the direction from both ends of the metal sheet 2 toward the middle.

[0060] For example, such as Figure 10 and Figure 11 As shown, the strength of the metal sheet 2 can also be gradually reduced from both ends toward the middle by changing the width and thickness of the metal sheet 2:

[0061] Specifically, such as Figure 10 As shown, in the fourth embodiment of the second group provided by the present invention, the width of the metal sheet 2 gradually narrows from both ends toward the middle, so that the strength of the metal sheet 2 gradually weakens from both ends toward the middle.

[0062] Specifically, such as Figure 11As shown, in the fifth embodiment of the second group provided by the present invention, the thickness of the metal sheet 2 is gradually reduced from both ends toward the middle, so that the strength of the metal sheet 2 is gradually weakened from both ends toward the middle.

[0063] Obviously, this design is not limited to the above embodiment. The strength of the metal sheet 2 can also be changed in other ways, such that the strength of the metal sheet 2 gradually decreases from both ends towards the middle, thereby making the metal sheet 2 more easily bent near the middle under external force. Figure 12 As shown.

[0064] The present invention also provides a curve drawing device, which includes the curve drawing ruler provided in any of the above embodiments, and may also include other structures for shaping the ruler, such as the shaping structure in patent CN106739686A, etc.

[0065] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A flexible ruler for drawing curves, characterized in that, Includes a flexible measuring tape body, wherein the flexible measuring tape body is configured such that the strength gradually decreases from both ends toward the middle, so that the strength of the curved drawing flexible measuring tape gradually decreases from both ends toward the middle. The material of the main body of the measuring tape is not limited; it can be metal, soft rubber, or silicone.

2. A flexible ruler for drawing curves, characterized in that, The measuring tape includes a main body, which is configured to gradually reduce in strength from both ends toward the middle, so that the strength of the curved drawing measuring tape gradually decreases from both ends toward the middle. The main body of the measuring tape is a one-piece structure.

3. A flexible ruler for drawing curves, characterized in that, It includes only the main body of the measuring tape, which is configured to gradually weaken in strength from both ends toward the middle, so that the strength of the curved drawing measuring tape gradually weakens from both ends toward the middle.

4. A flexible ruler for drawing curves according to any one of claims 1 to 3, characterized in that, The thickness of the measuring tape body gradually decreases from both ends towards the middle, so that the strength of the measuring tape body weakens from both ends towards the middle; or, The width of the measuring tape body gradually narrows from both ends towards the middle, so that the strength of the measuring tape body gradually decreases from both ends towards the middle; or, The measuring tape body has multiple openings arranged along its length. The opening area gradually increases from both ends towards the center, thus reducing the strength of the measuring tape body from both ends towards the center; or... The measuring tape body has at least one long side with multiple notches, and the area of ​​the multiple notches on the same long side gradually increases from both ends of the measuring tape body toward the middle.

5. A flexible ruler for curve drawing according to claim 4, characterized in that, The plurality of openings are arranged in a row along the length of the main body of the measuring tape, and the area of ​​the openings gradually increases in the direction near the middle of the main body of the measuring tape.

6. A flexible ruler for drawing curves according to claim 4, characterized in that, The plurality of openings are arranged in two rows along the length of the metal sheet. The two rows of openings are respectively located near the two long sides of the metal sheet. In the direction near the middle of the metal sheet, the area of ​​the openings in the same row gradually increases, so that the strength of the metal sheet gradually weakens from both ends toward the middle.

7. A flexible ruler for drawing curves according to claim 4, characterized in that, The multiple openings are all elliptical, square, or irregularly shaped.

8. A flexible ruler for drawing curves according to claim 1, characterized in that, The measuring tape has graduation lines on its main body.

9. A curve plotting device, characterized in that, Including the curve drawing ruler as described in any one of claims 1 to 8.

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