A curve drawing ruler and a curve drawing device

Abstract

The present invention relates to the field of teaching drawing. The present invention provides a curve drawing tape measure and a curve drawing device, wherein the curve drawing tape measure comprises a tape measure body, and the tape measure body is arranged to have a structure in which the strength is gradually weakened from both ends toward the middle, so that the strength of the curve drawing tape measure is gradually weakened from both ends toward the middle; the strength of the curve drawing tape measure is gradually weakened from both ends toward the middle, so that the middle is positioned to form the vertex of the curve, and the positions on both sides of the middle position are positioned respectively, so that the closer to the middle position, the smaller the strength, and the easier it is to be shaped by the positioning point and bend to a setting with a larger curvature, thereby improving the problem of low precision of the tape measure in the prior art when the curve is made through a specific point.

Description

Technical Field

[0001] The invention relates to a teaching drawing tool, in particular to a curve drawing soft ruler and a curve drawing device. Background Art

[0002] In the process of drawing a curve, the user will determine several specific points, and then bend the tape measure sideways and position it on the specific points to form the required curve. Taking Chinese patent CN106739686A as an example, the patent discloses a teaching drawing tool, specifically disclosing a method of using five fixed points to make curves including parabolas. However, it is not difficult to find that most parabolic vertices have a large curvature around the vertex, and existing tape measures cannot be bent into a curve around the vertex of the parabola, even if external force is used. Therefore, the accuracy is not high when drawing a curve around the vertex of the parabola. Summary of the invention

[0003] The inventor analyzed the existing tape measure that uses a fixed specific point to bend and make a curve and found that the problem that affects the accuracy of making the curve is that the curvature of the curve (parabola) is greater when it is closer to the vertex. However, because the strength of the existing tape measure is consistent at all points in the length direction, it is difficult to make the curvature greater when it is closer to the vertex of the curve when bending. Often, the curvature is smaller when it is closer to the vertex of the curve. In view of this, the present invention provides a curve drawing tape measure and a curve drawing device to improve the problem of low accuracy of the existing tape measure when the curve is made through a specific point.

[0004] The present invention provides a curve drawing tape measure, comprising a tape measure body, wherein the tape measure body is arranged to have a structure in which the strength is gradually weakened from both ends toward the middle, so that the strength of the curve drawing tape measure is gradually weakened from the two ends toward the middle.

[0005] Preferably, the thickness of the tape measure body is gradually thinned from both ends toward the middle, so that the strength of the tape measure body is weakened from both ends toward the middle; or,

[0006] The width of the tape measure body is gradually narrowed from both ends toward the middle, so that the strength of the tape measure body is gradually weakened from both ends toward the middle; or,

[0007] The tape measure body is provided with a plurality of openings, and the plurality of openings are arranged along the length direction of the tape measure body, and the opening areas of the tape measure body are gradually increased in the direction from the two ends to the middle of the tape measure body, so that the strength of the tape measure body is gradually weakened from the two ends to the middle; or,

[0008] At least one long side of the tape measure body is provided with a plurality of notches, and the plurality of notches arranged on the same long side are arranged with gradually increasing areas in the direction from the two ends of the tape measure body toward the middle.

[0009] Preferably, the plurality of openings are arranged in a row along the length direction of the tape measure body, and the areas of the openings gradually increase in a direction approaching the middle of the tape measure body.

[0010] Preferably, the multiple openings are arranged in two rows along the length direction of the metal sheet, and the two rows of openings are respectively arranged close to the two long sides of the metal sheet, and in the direction close to the middle of the metal sheet, the area of ​​the openings in the same row is gradually increased, so that the strength of the metal sheet is gradually weakened from both ends to the middle.

[0011] Preferably, the plurality of openings are all arranged in an elliptical, square or irregular shape.

[0012] Preferably, the tape measure body is provided with scale lines.

[0013] Preferably, the curve drawing tape is further provided with an outer layer made of elastic material, and the outer layer is arranged to wrap the tape body;

[0014] The main body of the tape measure is a metal sheet.

[0015] Preferably, the outer layer is made of TPU or silicone.

[0016] Preferably, the outer layer is provided with scale lines; or, the outer layer is transparent, and the tape measure body is provided with scale lines.

[0017] The present invention also provides a curve drawing device, including a curve drawing tape, wherein the curve drawing tape includes a tape body, and the tape body is configured to have a structure in which the strength gradually decreases from both ends toward the middle, so that the strength of the curve drawing tape gradually decreases from the two ends toward the middle.

[0018] The invention has the following effects: the strength of the curve drawing tape is set to gradually weaken from both ends to the middle, so that it is positioned in the middle to form the vertex of the curve, and when the two sides of the middle position are positioned respectively, the closer to the middle position, the smaller the strength becomes, and the easier it is to be shaped by the positioning point and bent into a setting with a larger curvature, thereby improving the problem of low accuracy of the tape in the prior art when it is used to make a curve through a specific point. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A front view schematic diagram of a first embodiment of a first set of curve drawing tapes provided by the present invention;

[0020] Figure 2 A front view schematic diagram of a second embodiment of the first set of the curve drawing tape provided by the present invention;

[0021] Figure 3 A front view schematic diagram of a third embodiment of the first group of the curve drawing tape provided by the present invention;

[0022] Figure 4 A front view schematic diagram of a fourth embodiment of the first set of the curve drawing tape provided by the present invention;

[0023] Figure 5 A side view schematically showing a fifth embodiment of the first set of the curve drawing tape provided by the present invention;

[0024] Figure 6 A schematic side view of a second group of embodiments of the curve drawing tape provided by the present invention after being cut away;

[0025] Figure 7 A front view schematic diagram of a first embodiment of a second set of the curve drawing tape provided by the present invention;

[0026] Figure 8 A front view schematic diagram of a second embodiment of a second set of the curve drawing tape provided by the present invention;

[0027] Fig. 9 A front view schematic diagram of a third embodiment of the second group of the curve drawing tape provided by the present invention;

[0028] Fig.10 A front view schematic diagram of a fourth embodiment of the second set of the curve drawing tape provided by the present invention;

[0029] Fig.11 A side view schematically showing a fifth embodiment of the second set of the curve drawing tape provided by the present invention;

[0030] Fig.12 for Figure 1 or Figure 6 Schematic diagram of the curve drawing tape being bent. Specific implementation plan

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0032] Figures 1 to 5 The first group of embodiments of the curve drawing tape 100 provided by the present invention, Figures 6 to 11 The second embodiment of the curve drawing tape 100 provided by the present invention is described below in conjunction with the specific drawings:

[0033] See also Figures 1 to 5The curve drawing tape measure 100 includes a tape measure body 10, and the tape measure body 10 is configured to have a structure in which the strength gradually decreases from both ends toward the middle, so that the strength of the curve drawing tape measure 100 gradually decreases from the two ends toward the middle.

[0034] The strength of the curve drawing tape measure 100 is set to gradually weaken from both ends to the middle. Therefore, the middle is positioned to form the vertex of the curve, and the positions on both sides of the middle position are positioned respectively. Therefore, the closer to the middle position, the smaller the strength becomes, and the easier it is to be shaped by the positioning point and bent into a setting with a larger curvature, thereby improving the problem of low accuracy of the tape measure in the prior art when making a curve through a specific point.

[0035] The curve drawing tape measure 100 may only include the tape measure body 10, or may include other structures, and the tape measure body 10 may only have one component, or may be a combination of several components, which is not limited here, and the material of the tape measure body 10 is not limited, and may be metal or soft rubber or silicone, etc., and preferably, the curve drawing tape measure 100 only includes the tape measure body 10, and the tape measure body 10 adopts a one-piece structure, which is simple in structure.

[0036] In addition, the tape measure body 10 may also be provided with scales to measure the length of the curve.

[0037] There are many ways to achieve the gradual weakening of the strength of the tape measure body 10 from both ends to the middle, which are described below in conjunction with specific drawings:

[0038] For example, Figure 1 and Figure 2 As shown, the tape measure body 10 is provided with a plurality of openings (10a / 10b), and the plurality of openings (10a / 10b) are arranged along the length direction of the tape measure body 10, and in the direction from the two ends of the tape measure body 10 toward the middle, the opening area on the tape measure body 10 is gradually increased, so that the strength of the tape measure body 10 is gradually weakened from the two ends toward the middle.

[0039] There is no limitation on the shapes of the plurality of openings (10a / 10b), for example, the plurality of openings (10a / 10b) are all elliptical, square or irregular in shape.

[0040] Specifically, 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 tape measure body 10, and the area of ​​the openings 10a gradually increases in the direction close to the middle of the tape measure body 10. In this embodiment, the openings 10a are arranged in an elliptical shape.

[0041] Specifically, 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 tape measure body 10, and the two rows of openings 10b are respectively arranged close to the two long sides of the tape measure body 10, and in the direction close to the middle of the tape measure body 10, the areas of the openings 10b in the same row are gradually increased, so that the strength of the tape measure body 10 is gradually weakened from both ends to the middle. The openings 10b are arranged in a special shape.

[0042] For example, 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 tape measure body 10 is provided with a plurality of notches 10c (specifically, in this embodiment, both long sides of the tape measure body 10 are provided with notches 10c), and the plurality of notches 10c arranged on the same long side are arranged in a direction from both ends of the tape measure body 10 toward the middle, and the notch area is gradually increased.

[0043] For example, Figure 4 and Figure 5 As shown, the width and thickness of the tape measure body 10 can also be changed so that the strength of the tape measure body 10 gradually weakens from both ends toward the middle:

[0044] Specifically, Figure 4 As shown, in the fourth embodiment of the first group provided by the present invention, the width of the tape measure body 10 is gradually narrowed from both ends toward the middle, so that the strength of the tape measure body 10 is gradually weakened from both ends toward the middle.

[0045] Specifically, Figure 5 As shown, in the fifth embodiment of the first group provided by the present invention, the thickness of the tape measure body 10 is gradually thinned from both ends toward the middle, so that the strength of the tape measure body 10 is gradually weakened from both ends toward the middle.

[0046] Obviously, the present design is not limited to the above-mentioned embodiment, and the strength of the tape measure body 10 can be changed in other ways, so that the strength of the tape measure body 10 is gradually weakened from both ends to the middle, so that the tape measure body 10 is easily bent near the middle part under the action of external force. Fig.12 shown.

[0047] See also Figures 6 to 11 , Figures 6 to 11This is a second group of embodiments of the curve drawing tape measure provided by the present invention. In this group of embodiments, the curve drawing tape measure 100 includes an outer layer 1 made of elastic material and a metal sheet 2, wherein the outer layer 1 wraps the metal sheet 2, and the metal sheet 2 can be the tape measure body 2 structure in the first group of embodiments. 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 tape measure 100 gradually weakens from both ends toward the middle.

[0048] The strength of the curve drawing tape measure 100 is set to gradually weaken from both ends to the middle. Therefore, the middle is positioned to form the vertex of the curve, and the positions on both sides of the middle position are positioned respectively. Therefore, the closer to the middle position, the smaller the strength becomes, and the easier it is to be shaped by the positioning point and bent into a setting with a larger curvature, thereby improving the problem of low accuracy of the tape measure in the prior art when making a curve through a specific point.

[0049] The material of the outer layer 1 is not limited, and can be various rubbers or other materials with good elasticity, etc. Specifically, for example, the material of the outer layer is TPU or silicone. The outer layer 1 and the metal sheet 2 can be integrated by injection molding, or other methods can be used.

[0050] In addition, the curve drawing tape 100 can also be set with scales to measure the length of the curve, and the position of the scale setting 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.

[0051] The material of the metal sheet is not limited. The main requirement is that the metal sheet has good toughness and can be bent multiple times without breaking. For example, it can be a copper sheet.

[0052] There are many ways to achieve the gradual weakening of the strength of the metal sheet 2 from both ends to the middle, which are described below in conjunction with specific drawings:

[0053] For example, Figure 7 and Figure 8 As shown, the metal sheet 2 is provided with a plurality of openings (2a / 2b), and the plurality of openings (2a / 2b) are arranged along the length direction of the metal sheet 2, and in the direction from the two ends of the metal sheet 2 toward the middle, the opening area on the metal sheet 2 is gradually increased, so that the strength of the metal sheet 2 is gradually weakened from the two ends toward the middle.

[0054] There is no limitation on the shapes of the plurality of openings (2a / 2b); for example, the plurality of openings (2a / 2b) are all elliptical, square or irregular in shape.

[0055] Specifically, Figure 7As 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 in the direction close to the middle of the metal sheet 2. In this embodiment, the openings 2a are elliptical.

[0056] Specifically, Figure 8 As shown, in the second embodiment of the second group provided by the present invention, the multiple openings 2b are arranged in two rows along the length direction of the metal sheet 2, and the two rows of openings 2b are respectively arranged close to the two long sides of the metal sheet 2, and in the direction close to the middle of the metal sheet 2, the areas of the openings 2b in the same row are gradually increased, so that the strength of the metal sheet 2 is gradually weakened from the two ends to the middle.

[0057] For example, Fig. 9 As shown, Fig. 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 plurality of notches 2c arranged on the same long side are arranged in a direction from the two ends of the metal sheet 2 toward the middle, and the notch area is gradually increased.

[0058] For example, Fig.10 and Fig.11 As shown, the width and thickness of the metal sheet 2 can also be changed so that the strength of the metal sheet 2 gradually weakens from both ends to the middle:

[0059] Specifically, Fig.10 As shown, in the fourth embodiment of the second group provided by the present invention, the width of the metal sheet 2 is gradually narrowed from both ends toward the middle, so that the strength of the metal sheet 2 is gradually weakened from both ends toward the middle.

[0060] Specifically, Fig.11 As shown, in the fifth embodiment of the second group provided by the present invention, the thickness of the metal sheet 2 is gradually thinned from both ends toward the middle, so that the strength of the metal sheet 2 is gradually weakened from both ends toward the middle.

[0061] Obviously, the present design is not limited to the above-mentioned embodiment, and the strength of the metal sheet 2 can be changed by other means, so that the strength of the metal sheet 2 is gradually weakened from both ends to the middle, so that the metal sheet 2 is easily bent near the middle under the action of external force. Fig.12 shown.

[0062] The present invention also provides a curve drawing device, which includes the curve drawing tape provided by any of the above embodiments, and may also include other structures for shaping the tape, such as the shaping structure in patent CN106739686A, etc.

[0063] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A curve drawing tape, characterized in that: The invention comprises a tape measure body, wherein the tape measure body is configured to have a structure in which the strength gradually decreases from both ends toward the middle, so that the strength of the curve drawing tape measure gradually decreases from both ends toward the middle: The thickness of the tape measure body is gradually thinned from both ends toward the middle, so that the strength of the tape measure body is weakened from both ends toward the middle; or, the width of the tape measure body is gradually narrowed from both ends toward the middle, so that the strength of the tape measure body is gradually weakened from both ends toward the middle; or, the tape measure body is provided with a plurality of openings, the plurality of openings are arranged along the length direction of the tape measure body, and the opening area of ​​the tape measure body is gradually increased in the direction from both ends toward the middle of the tape measure body, so that the strength of the tape measure body is gradually weakened from both ends toward the middle; or, at least one long side of the tape measure body is provided with a plurality of notches, and the notches arranged on the same long side have a gradually increasing notch area in the direction from both ends toward the middle of the tape measure body; The curve drawing tape also includes an outer layer made of elastic material, the outer layer wraps the tape body, and the tape body is a metal sheet; The material of the outer layer is TPU or silicone; The outer layer is provided with scale lines; or the outer layer is transparent, and the tape measure body is provided with scale lines.

2. A curve drawing tape according to claim 1, characterized in that: The plurality of openings are arranged in a row along the length direction of the tape measure body, and the areas of the openings gradually increase in a direction approaching the middle of the tape measure body.

3. A curve drawing tape according to claim 1, characterized in that: The plurality of openings are arranged in two rows along the length direction of the tape measure body. The two rows of openings are respectively arranged close to the two long sides of the tape measure body, and in the direction close to the middle of the tape measure body, the areas of the openings in the same row are gradually increased, so that the strength of the tape measure body is gradually weakened from both ends toward the middle.

4. A curve drawing tape according to claim 1, characterized in that: The multiple openings are all arranged in an elliptical, square or irregular shape.

5. A curve drawing device, characterized in that: The invention comprises a curve drawing tape as claimed in any one of claims 1 to 4.

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