阅读说明：本技术 一种几何绘图工具 (Geometric drawing tool ) 是由 顾益谦 周智敏 顾礼敬 于 2021-01-05 设计创作，主要内容包括：本发明提出了一种几何绘图工具。本发明涉及教学用具技术领域。本发明的方案：包括第一连接段、第二连接段、第三连接段和第四连接段,第一连接段的一端与第二连接段的一端转动连接,第二连接段远离第一连接段的一侧与第三连接段的一侧滑动连接,第三连接段远离第二连接段的一端与第四连接段的一侧滑动连接,第四连接段远离第三连接段的一端与第一连接段远离第二连接段的一端转动连接。本发明能够通过改变工具形状进行多种几何图形的快速绘制,还可以作为教学工具引导学生掌握各种图形的几何特征以及相关数学计算公式的推导和计算。(The invention provides a geometric drawing tool. The invention relates to the technical field of teaching aids. The scheme of the invention is as follows: including first linkage segment, second linkage segment, third linkage segment and fourth linkage segment, the one end of first linkage segment is rotated with the one end of second linkage segment and is connected, one side that first linkage segment was kept away from to the second linkage segment and one side sliding connection of third linkage segment, the one end that second linkage segment and one side sliding connection of fourth linkage segment are kept away from to the third linkage segment, the one end that third linkage segment was kept away from to the fourth linkage segment rotates with the one end that second linkage segment was kept away from to first linkage segment and is connected. The invention can rapidly draw various geometric figures by changing the shape of the tool, and can also be used as a teaching tool to guide students to master the geometric characteristics of various figures and the derivation and calculation of related mathematical calculation formulas.)

1. The utility model provides a geometry drawing instrument, its characterized in that, includes first linkage segment, second linkage segment, third linkage segment and fourth linkage segment, the one end of first linkage segment with the one end of second linkage segment is rotated and is connected, the second linkage segment is kept away from one side of first linkage segment with one side sliding connection of third linkage segment, the third linkage segment is kept away from the one end of second linkage segment with one side sliding connection of fourth linkage segment, the fourth linkage segment is kept away from the one end of third linkage segment with the one end of second linkage segment is rotated and is connected to first linkage segment.

2. The geometric drawing tool of claim 1, further comprising a first fixing member, wherein a first sliding groove is formed on a side of the second connecting section adjacent to the third connecting section, a second sliding groove is formed on a side of the third connecting section adjacent to the second connecting section, and the first fixing member extends through both the first sliding groove and the second sliding groove.

3. The geometric drawing instrument as claimed in claim 2, wherein said first fixing member includes a first connecting cylinder and two first cylinders, and said two first cylinders are connected to both ends of said first connecting cylinder, respectively.

4. The geometric drawing tool as claimed in claim 3, wherein the first connection cylinder has first protrusions formed on both sides thereof, and any one of the first cylinder has second protrusions formed on an inner sidewall thereof to be engaged with the first protrusions, a first elastic piece is arranged in the first connecting cylinder, two ends of the first elastic piece are respectively connected with the two first cylinders, the side wall of the first connecting cylinder is provided with a first limiting groove, the inner side wall of the first connecting cylinder is provided with a first offset lug, the first offset bump is positioned below the first limit groove, the first elastic piece is connected with a first limit piece, one end of the first limiting piece close to the first limiting groove is wedge-shaped, the second connecting section is provided with a plurality of first grooves matched with the first cylinder body along the length direction, the third connecting section is provided with a plurality of second grooves matched with the first cylinder along the length direction.

5. The geometric drawing instrument according to claim 1, further comprising a second fixing member, wherein a third sliding groove is formed on a side of the fourth connecting section adjacent to the third connecting section, the second fixing member extends through an end of the third connecting section remote from the second connecting section, and the second fixing member extends through the third sliding groove.

6. The geometric drawing instrument as in claim 5, wherein said second fixing member includes a second connecting cylinder and two second cylinder bodies, and said two second cylinder bodies are connected to both ends of said second connecting cylinder, respectively.

7. The geometric drawing tool according to claim 6, wherein third protruding blocks are disposed on two sides of the second connecting cylinder, a fourth protruding block engaged with the third protruding block is disposed on an inner sidewall of any one of the second cylinder bodies, a second elastic member is mounted in the second connecting cylinder, two ends of the second elastic member are respectively connected to the two second cylinder bodies, a second limiting groove is disposed on a sidewall of the second connecting cylinder, a second offset protruding block is disposed on an inner sidewall of the second connecting cylinder, the second offset protruding block is located below the second limiting groove, the second elastic member is connected to a second limiting member, one end of the second limiting member close to the second limiting groove is wedge-shaped, and a plurality of third grooves engaged with the second cylinder bodies are disposed along a length direction of the fourth connecting section.

8. A geometric drawing instrument according to claim 1, wherein one end of said first connector segment is hingedly connected to one end of said second connector segment.

9. A geometric drawing instrument according to claim 1, wherein the end of said fourth connector portion remote from said third connector portion is hinged to the end of said first connector portion remote from said second connector portion.

10. A geometric drawing instrument according to claim 1, wherein said first, second, third and fourth connector segments are provided with graduation marks.

Technical Field

The invention relates to the technical field of teaching aids, in particular to a geometric drawing tool.

Background

In the teaching of mathematics, the teaching of geometry mathematics is an important part, the teaching of geometry is mainly geometry and related formulas, in the geometric drawing, a ruler is a tool for drawing figures in mathematics and drawing.

At present, the geometric drawing tools on the market are single in structure, and drawing tools in various shapes are needed to draw during teaching drawing, so that the drawing tool is quite inconvenient.

Disclosure of Invention

The invention aims to provide a geometric drawing tool which can draw various patterns by changing shapes.

The embodiment of the invention is realized by the following steps:

the embodiment of the application provides a geometry drawing instrument, including first linkage segment, the second linkage segment, third linkage segment and fourth linkage segment, the one end of first linkage segment is rotated with the one end of second linkage segment and is connected, one side that first linkage segment was kept away from to the second linkage segment and one side sliding connection of third linkage segment, the one end that second linkage segment and one side sliding connection of fourth linkage segment were kept away from to the third linkage segment, the one end that third linkage segment was kept away from to the fourth linkage segment rotates with the one end that second linkage segment was kept away from to first linkage segment and is connected.

In some embodiments of the invention, the above-mentioned further includes a first fixing element, a first sliding groove is disposed on a side of the second connecting section close to the third connecting section, a second sliding groove is disposed on a side of the third connecting section close to the second connecting section, and the first fixing element penetrates through both the first sliding groove and the second sliding groove.

In some embodiments of the present invention, the first fixing member includes a first connecting cylinder and two first cylinders, and the two first cylinders are respectively connected to two ends of the first connecting cylinder.

In some embodiments of the invention, first protruding blocks are disposed on two sides of the first connecting cylinder, a second protruding block matched with the first protruding block is disposed on an inner side wall of any one of the first cylinder bodies, a first elastic member is installed in the first connecting cylinder, two ends of the first elastic member are respectively connected with the two first cylinder bodies, a first limiting groove is disposed on a side wall of the first connecting cylinder, a first offset protruding block is disposed on an inner side wall of the first connecting cylinder, the first offset protruding block is located below the first limiting groove, the first elastic member is connected with a first limiting member, one end of the first limiting member close to the first limiting groove is wedge-shaped, a plurality of first grooves matched with the first cylinder bodies are disposed along a length direction of the second connecting section, and a plurality of second grooves matched with the first cylinder bodies are disposed along a length direction of the third connecting section.

In some embodiments of the invention, the above-mentioned further includes a second fixing element, a third sliding groove is provided on a side of the fourth connecting section close to the third connecting section, the second fixing element penetrates through one end of the third connecting section far from the second connecting section, and the second fixing element penetrates through the third sliding groove.

In some embodiments of the present invention, the second fixing member includes a second connecting cylinder and two second cylinder bodies, and the two second cylinder bodies are respectively connected to two ends of the second connecting cylinder.

In some embodiments of the invention, the two sides of the second connecting cylinder are provided with third protruding blocks, the inner side wall of any one of the second cylinder bodies is provided with a fourth protruding block matched with the third protruding block, a second elastic member is installed in the second connecting cylinder, two ends of the second elastic member are respectively connected with the two second cylinder bodies, the side wall of the second connecting cylinder is provided with a second limiting groove, the inner side wall of the second connecting cylinder is provided with a second offset protruding block, the second offset protruding block is located below the second limiting groove, the second elastic member is connected with a second limiting member, one end of the second limiting member close to the second limiting groove is in a wedge shape, and the fourth connecting section is provided with a plurality of third grooves matched with the second cylinder bodies along the length direction.

In some embodiments of the present invention, one end of the first connecting section is hinged to one end of the second connecting section.

In some embodiments of the present invention, an end of the fourth connecting section away from the third connecting section is hinged to an end of the first connecting section away from the second connecting section.

In some embodiments of the present invention, the first connecting section, the second connecting section, the third connecting section and the fourth connecting section are provided with scale marks.

Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:

the utility model provides a geometry drawing instrument, including first linkage segment, the second linkage segment, third linkage segment and fourth linkage segment, the one end of first linkage segment is rotated with the one end of second linkage segment and is connected, one side that first linkage segment was kept away from to the second linkage segment and one side sliding connection of third linkage segment, the one end that second linkage segment and one side sliding connection of fourth linkage segment are kept away from to the third linkage segment, the one end that third linkage segment was kept away from to the fourth linkage segment rotates with the one end that second linkage segment was kept away from to first linkage segment and is connected.

In the above embodiment, a geometric drawing tool is composed of a first connection section, a second connection section, a third connection section and a fourth connection section, wherein the first connection section, the second connection section, the third connection section and the fourth connection section can be rectangular, further, the first connection section, the second connection section, the third connection section and the fourth connection section are sequentially connected to form a closed loop, further, one end of the first connection section is rotatably connected with one end of the second connection section, one side of the second connection section, which is far away from the first connection section, is slidably connected with one side of the third connection section, one end of the third connection section, which is far away from the second connection section, is slidably connected with one side of the fourth connection section, one end of the fourth connection section, which is far away from the third connection section, is rotatably connected with one end of the first connection section, one side of the second connection section, which is far away from the first connection section, is provided with a first sliding groove, wherein the first sliding groove is arranged along the length direction of the second connecting section; a second sliding groove is formed in one side, close to the second connecting section, of the third connecting section, and the second sliding groove is formed in the length direction of the third connecting section, wherein the first fixing piece penetrates through the first sliding groove and the second sliding groove at the same time, and can slide in the length direction of the first sliding groove and the second sliding groove, so that the relative positions of the second connecting section and the third connecting section are changed; similarly, one side that the fourth linkage segment is close to above-mentioned third linkage segment is provided with the third sliding tray, the second mounting runs through the third linkage segment simultaneously and keeps away from the one end of second linkage segment and above-mentioned third sliding tray, the second mounting can slide along the length direction of third sliding tray, can change the relative position of third linkage segment and fourth linkage segment through sliding the second mounting in the third sliding tray, furthermore, first linkage segment rotates with the second linkage segment to be connected, can change the relative position of first linkage segment and second linkage segment through rotating first linkage segment and second linkage segment, first linkage segment rotates with the fourth linkage segment to be connected, through rotating, the relative position of first linkage segment and fourth linkage segment can change first linkage segment and fourth linkage segment.

In this embodiment, the first connecting section, the second connecting section, the third connecting section and the fourth connecting section can rotate relatively, and the shape can be changed by the rotation between adjacent sections, further, the second connecting section and the third connecting section can slide relatively, and the shape of the whole can also be changed by the sliding of the second connecting section and the third connecting section; one end of the third connecting section, which is far away from the second connecting section, can slide relative to the fourth connecting section, and the overall shape can also be changed through the sliding of the third connecting section relative to the fourth connecting section; the first connecting section, the second connecting section, the third connecting section and the fourth connecting section can be adjusted into various shapes, wherein various quadrangles (convex quadrangles, concave quadrangles, squares, rectangles, rhombuses, parallelograms, various trapezoids and the like) and various triangles (regular triangles, isosceles triangles, right isosceles triangles, acute triangles, obtuse triangles and the like) can be adjusted, drawing can be carried out according to the adjusted shapes, the drawn figures are quicker, simpler and more convenient and more standard, on the other hand, teaching can be carried out by taking the adjusted shapes as teaching molds, various standard patterns can be drawn according to the geometric drawing tool, and various teaching molds can be adjusted to carry out teaching.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a geometry drawing tool according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first fixing element according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of a second fixing element according to an embodiment of the invention.

The following are marked in the figure: 1-a first connection section, 2-a second connection section, 3-a third connection section, 4-a fourth connection section, 5-a first fixing piece, 6-a second fixing piece, 7-a first sliding groove, 8-a second sliding groove, 9-a third sliding groove, 10-a first cylinder, 11-a first connection cylinder, 12-a first elastic piece, 13-a first bump, 14-a second bump, 15-a first limiting groove, 16-a first offset bump, 17-a first limiting piece, 18-a second cylinder, 19-a second connection cylinder, 20-a second elastic piece, 21-a third bump, 22-a fourth bump, 23-a second limiting groove, 24-a second offset bump.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that if the terms "inside", "outside", etc. indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings or an orientation or a positional relationship which is usually arranged when the product of the present invention is used, the description is only for convenience and simplification of the description, but the indication or the suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, the present invention should not be construed as being limited. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the term "vertical" and the like, if present, does not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "a plurality" represents at least 2.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Examples

Please refer to fig. 1-3. This embodiment provides a geometry drawing instrument, including first linkage segment 1, second linkage segment 2, third linkage segment 3 and fourth linkage segment 4, the one end of first linkage segment 1 rotates with the one end of second linkage segment 2 to be connected, one side that first linkage segment 1 was kept away from to second linkage segment 2 and one side sliding connection of third linkage segment 3, the one end that second linkage segment 2 was kept away from to third linkage segment 3 and one side sliding connection of fourth linkage segment 4, the one end that third linkage segment 3 was kept away from to fourth linkage segment 4 rotates with the one end that second linkage segment 2 was kept away from to first linkage segment 1 to be connected.

In the above embodiment, a geometric drawing tool is composed of a first connection section 1, a second connection section 2, a third connection section 3 and a fourth connection section 4, wherein the first connection section 1, the second connection section 2, the third connection section 3 and the fourth connection section 4 can all be rectangular, further, the first connection section 1, the second connection section 2, the third connection section 3 and the fourth connection section 4 are sequentially connected to form a closed loop, further, one end of the first connection section 1 is rotatably connected with one end of the second connection section 2, one side of the second connection section 2 far away from the first connection section 1 is slidably connected with one side of the third connection section 3, one end of the third connection section 3 far away from the second connection section 2 is slidably connected with one side of the fourth connection section 4, one end of the fourth connection section 4 far away from the third connection section 3 is rotatably connected with one end of the first connection section 1 far away from the second connection section 2, a first sliding groove 7 is formed in one side, away from the first connecting section 1, of the second connecting section 2, wherein the first sliding groove 7 is formed along the length direction of the second connecting section 2; a second sliding groove 8 is formed in one side, close to the second connecting section 2, of the third connecting section 3, the second sliding groove 8 is formed along the length direction of the third connecting section 3, the first fixing piece 5 penetrates through the first sliding groove 7 and the second sliding groove 8 at the same time, and the first fixing piece 5 can slide along the length direction of the first sliding groove 7 and the second sliding groove 8, so that the relative positions of the second connecting section 2 and the third connecting section 3 are changed; similarly, a third sliding groove 9 is formed in one side, close to the third connecting section 3, of the fourth connecting section 4, the second fixing piece 6 penetrates through one end, far away from the second connecting section 2, of the third connecting section 3 and the third sliding groove 9 simultaneously, the second fixing piece 6 can slide along the length direction of the third sliding groove 9, the relative positions of the third connecting section 3 and the fourth connecting section 4 can be changed by sliding the second fixing piece 6 in the third sliding groove 9, further, the first connecting section 1 is rotatably connected with the second connecting section 2, the relative positions of the first connecting section 1 and the second connecting section 2 can be changed by rotating the first connecting section 1 and the second connecting section 2, the first connecting section 1 is rotatably connected with the fourth connecting section 4, and by rotating the first connecting section 1 and the fourth connecting section 4, the relative positions of the first connecting section 1 and the fourth connecting section 4 can be changed.

In this embodiment, the first connecting section 1, the second connecting section 2, the third connecting section 3 and the fourth connecting section 4 can rotate relatively, and the shape can be changed by the rotation between adjacent sections, further, the second connecting section 2 and the third connecting section 3 can slide relatively, and the overall shape can be changed by the sliding of the second connecting section 2 and the third connecting section 3; one end of the third connecting section 3, which is far away from the second connecting section 2, can slide relative to the fourth connecting section 4, and the overall shape can also be changed by the sliding of the third connecting section 3 relative to the fourth connecting section 4; the first connecting section 1, the second connecting section 2, the third connecting section 3 and the fourth connecting section 4 can be adjusted to be in various shapes, and can be adjusted to be in various quadrangles (convex quadrangles, concave quadrangles, squares, rectangles, rhombuses, parallelograms, various trapezoids and the like) and various triangles (regular triangles, isosceles triangles, right isosceles triangles, acute triangles, obtuse triangles and the like).

In some embodiments of the present invention, the first fixing member 5 is further included, a first sliding groove 7 is disposed on a side of the second connecting section 2 close to the third connecting section 3, a second sliding groove 8 is disposed on a side of the third connecting section 3 close to the second connecting section 2, and the first fixing member 5 penetrates through both the first sliding groove 7 and the second sliding groove 8.

In this embodiment, a first sliding groove 7 is disposed on a side of the second connecting section 2 close to the third connecting section 3, a second sliding groove 8 is disposed on a side of the third connecting section 3 close to the second connecting section 2, and the first fixing member 5 penetrates through the first sliding groove 7 and the second sliding groove 8 at the same time, so that the second connecting section 2 and the third connecting section 3 can slide relatively to change the overall shape.

In some embodiments of the present invention, the first fixing member 5 includes a first connection cylinder 11 and two first cylinders 10, and the two first cylinders 10 are respectively connected to both ends of the first connection cylinder 11.

In this embodiment, the first fixing member 5 is composed of a first connecting cylinder 11 and two first cylinder bodies 10, the first connecting cylinder 11 penetrates through the first sliding groove 7 and the second sliding groove 8, the two ends of the first connecting cylinder 11 are respectively connected with the first cylinder bodies 10 to prevent the first connecting cylinder 11 from separating from the first sliding groove 7 and the second sliding groove 8, and the second connecting section 2 and the third connecting section 3 slide relatively to each other to change the overall shape.

In some embodiments of the present invention, first protruding blocks 13 are disposed on two sides of the first connecting cylinder 11, a second protruding block 14 matched with the first protruding block 13 is disposed on an inner side wall of any one of the first cylinders 10, a first elastic member 12 is installed in the first connecting cylinder 11, two ends of the first elastic member 12 are respectively connected to the two first cylinders 10, a first limiting groove 15 is disposed on a side wall of the first connecting cylinder 11, a first offset protruding block 16 is disposed on an inner side wall of the first connecting cylinder 11, the first offset protruding block 16 is located below the first limiting groove 15, the first elastic member 12 is connected to a first limiting member 17, one end of the first limiting member 17 close to the first limiting groove 15 is wedge-shaped, the second connecting section 2 is provided with a plurality of first grooves matched with the first cylinders 10 along a length direction, and the third connecting section 3 is provided with a plurality of second grooves matched with the first cylinders 10 along a length direction.

In this embodiment, the outer side walls of the two sides of the first connecting cylinder 11 are provided with first protrusions 13, the inner side wall of the opening direction of the first cylinder 10 connected to the first connecting cylinder 11 is provided with second protrusions 14, wherein the first protrusions 13 and the second protrusions 14 are used for limiting so that the first cylinder 10 is not separated from the first connecting cylinder 11, further, the first connecting cylinder 11 is provided with a first elastic member 12, two ends of the first elastic member 12 are respectively connected to the two first cylinders 10, so that the first cylinders 10 at two ends of the first cylinder 10 can be pressed to extrude the first elastic member 12, the first elastic member 12 recovers deformation after the force applied to the first cylinder 10 is removed, further, the side wall of the first connecting cylinder 11 is provided with a first limiting groove 15, the inner side wall of the first connecting cylinder 11 is provided with a first deviation protrusion 16, the first deviation protrusion 16 is located below the first limiting groove 15, the first offset bump 16 and the first limiting groove 15 are located in the same vertical direction, the first elastic element 12 is connected with a first limiting element 17, and one end of the first limiting element 17 close to the first limiting groove 15 is wedge-shaped. The working principle is as follows: firstly, the relative position between the second connecting section 2 and the third connecting section 3 is adjusted through the first sliding groove 7 and the second sliding groove 8, the first barrel 10 at the two ends of the first connecting barrel 11 is pressed after the adjustment is completed, the first limiting piece 17 moves downwards after the first elastic piece 12 is compressed, one end of the first limiting piece 17 is clamped with the first connecting barrel 11 when passing through the first limiting groove 15 (the first limiting piece 17 is abutted against the side wall of the first connecting barrel 11, so the first limiting piece 17 can be popped out when passing through the first limiting groove 15), at this time, the first barrel 10 at the two ends of the first connecting barrel 11 is respectively sunk into the first groove and the second groove, the second connecting section 2 and the third connecting section 3 are prevented from continuously sliding relatively, only the first barrel 10 needs to be pressed again when being separated, and the first limiting piece 17 returns under the action of the first offset bump 16 and cannot pass through the first limiting groove 15.

In some embodiments of the present invention, the connector further comprises a second fixing element 6, a third sliding groove 9 is provided on a side of the fourth connecting section 4 close to the third connecting section 3, the second fixing element 6 penetrates through an end of the third connecting section 3 far from the second connecting section 2, and the second fixing element 6 penetrates through the third sliding groove 9.

In this embodiment, the second fixing member 6 penetrates through one end of the third connecting section 3 far away from the second connecting section 2, the second fixing member 6 penetrates through the third sliding groove 9, and one end of the third connecting section 3 slides relative to the third sliding groove 9 to change the overall shape.

In some embodiments of the present invention, the second fixing member 6 includes a second connection cylinder 19 and two second cylinder bodies 18, and the two second cylinder bodies 18 are respectively connected to both ends of the second connection cylinder 19.

In this embodiment, the second fixing member 6 is composed of a second connecting cylinder 19 and two second cylinder bodies 18, the second connecting cylinder 19 penetrates through the third sliding groove 9 and one end of the third connecting section 3, and the two second cylinder bodies 18 are respectively connected with two ends of the second connecting cylinder 19.

In some embodiments of the present invention, third protruding blocks 21 are disposed on two sides of the second connecting cylinder 19, a fourth protruding block 22 matched with the third protruding block 21 is disposed on an inner side wall of any one of the second cylinder bodies 18, a second elastic member 20 is installed in the second connecting cylinder 19, two ends of the second elastic member 20 are respectively connected with the two second cylinder bodies 18, a second limiting groove 23 is disposed on a side wall of the second connecting cylinder 19, a second offset protruding block 24 is disposed on an inner side wall of the second connecting cylinder 19, the second offset protruding block 24 is located below the second limiting groove 23, the second elastic member 20 is connected with a second limiting member, one end of the second limiting member close to the second limiting groove 23 is wedge-shaped, and the fourth connecting section 4 is provided with a plurality of third grooves matched with the second cylinder bodies 18 along a length direction.

In this embodiment, the outer sidewalls of the two sides of the second connecting cylinder 19 are both provided with third protrusions 21, the inner sidewall of the opening direction of the second cylinder 18 connected to the second connecting cylinder 19 is provided with fourth protrusions 22, wherein the limiting action of the third protrusions 21 and the fourth protrusions 22 prevents the second cylinder 18 from separating from the second connecting cylinder 19, further, the second connecting cylinder 19 is provided with a second elastic member 20, two ends of the second elastic member 20 are respectively connected to the two second cylinders 18, so that the second cylinders 18 at two ends of the second cylinder 18 can be pressed to extrude the second elastic member 20, the second elastic member 20 recovers deformation after the force applied to the second cylinder 18 is removed, further, the sidewalls of the second connecting cylinder 19 are provided with second limiting grooves 23, the inner sidewall of the second connecting cylinder 19 is provided with second deviation protrusions 24, the first deviation protrusions 16 are located below the second limiting grooves 23, the second offset bump 24 and the second limiting groove 23 are located in the same vertical direction, the second elastic member 20 is connected to a second limiting member, and one end of the second limiting member close to the second limiting groove 23 is wedge-shaped. The working principle is as follows: firstly, the relative position between the third connecting section 3 and the fourth connecting section 4 is adjusted through the third sliding groove 9, the second barrel 18 at two ends of the second connecting barrel 19 is pressed after the adjustment is completed, the second elastic element 20 moves downwards after being compressed, one end of the second limiting element is clamped with the second connecting barrel 19 when passing through the second limiting groove 23 (the second limiting element is abutted against the side wall of the second connecting barrel 19, so the second limiting element can be popped out when passing through the second limiting groove 23), at this time, the first barrel 10 at one end of the second connecting barrel 19 sinks into the third groove, so that the third connecting section 3 and the fourth connecting section 4 are prevented from continuously sliding relatively, only the second barrel 18 needs to be pressed again when being separated, and the second limiting element can not pass through the second limiting groove 23 under the action of the second offset bump 24. .

In some embodiments of the invention, one end of the first connecting section 1 is hinged to one end of the second connecting section 2.

In this embodiment, the first connecting section 1 and the second connecting section 2 can change the overall shape by rotating.

In some embodiments of the invention, the end of the fourth connecting section 4 remote from the third connecting section 3 is hinged to the end of the first connecting section 1 remote from the second connecting section 2.

In this embodiment, the overall shape of the fourth connecting section 4 can be changed by rotating the fourth connecting section 4 relative to the first connecting section 4.

In some embodiments of the present invention, the first connecting section 1, the second connecting section 2, the third connecting section 3 and the fourth connecting section 4 are provided with graduation marks.

In this embodiment, first linkage segment 1, second linkage segment 2, third linkage segment 3 and fourth linkage segment 4 set up the scale mark, can conveniently measure.

In summary, an embodiment of the present invention provides a geometric drawing tool, which includes a first connection section 1, a second connection section 2, a third connection section 3, and a fourth connection section 4, wherein one end of the first connection section 1 is rotatably connected to one end of the second connection section 2, one side of the second connection section 2 away from the first connection section 1 is slidably connected to one side of the third connection section 3, one end of the third connection section 3 away from the second connection section 2 is slidably connected to one side of the fourth connection section 4, and one end of the fourth connection section 4 away from the third connection section 3 is rotatably connected to one end of the first connection section 1 away from the second connection section 2.

In the above embodiment, a geometric drawing tool is composed of a first connection section 1, a second connection section 2, a third connection section 3 and a fourth connection section 4, wherein the first connection section 1, the second connection section 2, the third connection section 3 and the fourth connection section 4 can all be rectangular, further, the first connection section 1, the second connection section 2, the third connection section 3 and the fourth connection section 4 are sequentially connected to form a closed loop, further, one end of the first connection section 1 is rotatably connected with one end of the second connection section 2, one side of the second connection section 2 far away from the first connection section 1 is slidably connected with one side of the third connection section 3, one end of the third connection section 3 far away from the second connection section 2 is slidably connected with one side of the fourth connection section 4, one end of the fourth connection section 4 far away from the third connection section 3 is rotatably connected with one end of the first connection section 1 far away from the second connection section 2, a first sliding groove 7 is formed in one side, away from the first connecting section 1, of the second connecting section 2, wherein the first sliding groove 7 is formed along the length direction of the second connecting section 2; a second sliding groove 8 is formed in one side, close to the second connecting section 2, of the third connecting section 3, the second sliding groove 8 is formed along the length direction of the third connecting section 3, the first fixing piece 5 penetrates through the first sliding groove 7 and the second sliding groove 8 at the same time, and the first fixing piece 5 can slide along the length direction of the first sliding groove 7 and the second sliding groove 8, so that the relative positions of the second connecting section 2 and the third connecting section 3 are changed; similarly, a third sliding groove 9 is formed in one side, close to the third connecting section 3, of the fourth connecting section 4, the second fixing piece 6 penetrates through one end, far away from the second connecting section 2, of the third connecting section 3 and the third sliding groove 9 simultaneously, the second fixing piece 6 can slide along the length direction of the third sliding groove 9, the relative positions of the third connecting section 3 and the fourth connecting section 4 can be changed by sliding the second fixing piece 6 in the third sliding groove 9, further, the first connecting section 1 is rotatably connected with the second connecting section 2, the relative positions of the first connecting section 1 and the second connecting section 2 can be changed by rotating the first connecting section 1 and the second connecting section 2, the first connecting section 1 is rotatably connected with the fourth connecting section 4, and by rotating the first connecting section 1 and the fourth connecting section 4, the relative positions of the first connecting section 1 and the fourth connecting section 4 can be changed.

In this embodiment, the first connecting section 1, the second connecting section 2, the third connecting section 3 and the fourth connecting section 4 can rotate relatively, and the shape can be changed by the rotation between adjacent sections, further, the second connecting section 2 and the third connecting section 3 can slide relatively, and the overall shape can be changed by the sliding of the second connecting section 2 and the third connecting section 3; one end of the third connecting section 3, which is far away from the second connecting section 2, can slide relative to the fourth connecting section 4, and the overall shape can also be changed by the sliding of the third connecting section 3 relative to the fourth connecting section 4; the first connecting section 1, the second connecting section 2, the third connecting section 3 and the fourth connecting section 4 can be adjusted to be in various shapes, wherein various quadrangles (convex quadrangles, concave quadrangles, squares, rectangles, rhombuses, parallelograms, various trapezoids and the like) and various triangles (regular triangles, isosceles triangles, right isosceles triangles, acute triangles, obtuse triangles and the like) can be adjusted, on the other hand, teaching can be performed according to the adjusted shapes as teaching molds, various standard patterns can be drawn according to the geometric drawing tool, and various teaching molds can also be adjusted to be used for teaching.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.