A set square

Abstract

This utility model relates to the technical field of drawing tools, and particularly to a set square. The present utility model discloses a set square, including a set square body and a backing plate rotatably mounted on the set square body; the backing plate includes an upper backing plate, a lower backing plate, and bolts, with the set square body positioned between the upper and lower backing plates; one side of the upper and lower backing plates is fixed to the set square body via a pivot, and the other side can be locked together; the set square body has circumferentially distributed grooves, and the upper backing plate has elastic posts with protrusions; as the backing plate rotates along the circumferential direction of the grooves, the protrusions can engage with different grooves. It aims to solve the technical problem of insufficient accuracy in angle measurement and line drawing in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of drawing tools, and in particular to a set square. Background Technology

[0002] A set square is a rigid drawing instrument with standardized graduations. It is designed to assist users in constructing straight lines and segments, and to determine the length of target line segments using the linear reference system provided by the graduations. However, current set squares generally have limited functionality and are insufficient for most field applications.

[0003] Chinese utility model patent CN210116301U, published on February 28, 2020, discloses a foldable multifunctional set square, comprising a set square body and a ruler. The ruler is rotatably connected to the set square body. Both the set square and the ruler have scale markings. Positioning grooves are provided on both the set square and the ruler, and multiple positioning points are set on the positioning grooves. These positioning points correspond one-to-one with the scale markings and are flush. The tip of a drawing pen can be positioned at one of the positioning points, allowing parallel lines to be drawn by translating the set square body. In this patent, the slider and the straight rod are riveted together. The slider is fixed at a suitable angle by tightening it. However, this method makes it easy for the straight rod to shift during tightening, resulting in insufficient accuracy. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a set square, which aims to solve the technical problem of insufficient accuracy in angle measurement and line marking in the prior art.

[0005] To achieve the above objectives, this utility model proposes a set square, comprising a set square body and a backing plate rotatably mounted on the set square body; the backing plate includes an upper backing plate, a lower backing plate, and bolts, with the set square body positioned between the upper and lower backing plates; one side of the upper and lower backing plates is fixed to the set square body via a pivot, and the other side can be locked together; the set square body is provided with circumferentially distributed grooves, and the upper backing plate is provided with an elastic post, the elastic post having protrusions; as the backing plate rotates along the circumferential direction of the groove distribution, the protrusions can engage with different grooves.

[0006] Preferably, the elastic column includes a housing and an elastic body disposed within the housing; the protrusion is a sphere that is engaged with the housing, and the protrusion is connected to the elastic body and is capable of compressing the elastic body.

[0007] Preferably, the upper back plate has an upper protrusion on the side near the triangle ruler body, the lower back plate has a lower protrusion on the side near the triangle ruler body, and the elastic post is disposed on the upper protrusion.

[0008] Preferably, the set square body is a right triangle, the pivot is set on the center line of the set square body, and the pivot is set on the side close to the right angle vertex of the set square body.

[0009] Preferably, the upper and lower back plates are fixed to the side away from the pivot by bolts, and the distance between the center line of the bolts and the center line of the pivot is less than or equal to the length of the right-angle side of the triangle ruler body.

[0010] Preferably, the set square body is provided with triangular holes, round holes and rectangular holes.

[0011] Preferably, the set square body is provided with an arc groove, the arc groove is distributed along the arc direction formed by the groove, and angle scale lines are distributed along the arc groove on the set square body.

[0012] Compared with the prior art, the beneficial effects of the set square provided by this utility model are as follows:

[0013] 1. The set square body and the backing plate can rotate. Through the cooperation of the groove and the protrusion, it can be positioned at different angles, thereby realizing the positioning and marking of lines at different angles.

[0014] 2. The elastic column works in conjunction with the protrusion to extend and retract, allowing the backing plate to be fixed in the groove position. Positioning does not require manual tightening, making it simple and more accurate.

[0015] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the backing plate of the triangle ruler in the initial position according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the triangle ruler's backing plate after rotation, according to an embodiment of this utility model.

[0018] Figure 3 This is an embodiment of the present utility model. Figure 2 A side view structural diagram.

[0019] Figure 4 This is a schematic diagram of the structure of the elastic column according to an embodiment of the present invention.

[0020] In the diagram: 1. Triangle ruler body; 11. Groove; 12. Triangular hole; 13. Round hole; 14. Rectangular hole; 15. Arc groove; 2. Backing plate; 21. Upper backing plate; 211. Upper protrusion; 22. Lower backing plate; 221. Lower protrusion; 3. Elastic column; 31. Protrusion; 32. Shell; 33. Elastic body; 4. Bolt; 5. Shaft. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0022] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0023] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] A set square is generally used for marking lines in woodworking, but it can also be used in the construction industry or other fields for drawing.

[0026] See Figure 1 This utility model provides a set square, including a set square body 1 and a backing plate 2 rotatably mounted on the set square body 1. The backing plate 2 includes an upper backing plate 21 and a lower backing plate 22, with the set square body 1 positioned between the upper backing plate 21 and the lower backing plate 22. The upper backing plate 21 and the lower backing plate 22 generally have the same structure and a certain thickness. When used on a square wooden board, the side of the backing plate 2 is placed against the side of the square wooden board, and the set square body 1 is pressed tightly against the upper surface of the square wooden board. Length graduation lines are provided on the right-angled side and the hypotenuse of the set square body 1 for easy drawing of straight lines. However, in actual processing, wood is not always square and may have irregular shapes; therefore, the backing plate 2 is designed to be rotatable.

[0027] Furthermore, one side of the upper support plate 21 and the lower support plate 22 are fixed to the triangle ruler body 1 via a pivot 5, and the other side can be locked together. The triangle ruler body 1 is provided with circumferentially distributed grooves 11, and the upper support plate 21 is provided with an elastic post 3, which has a protrusion 31. During rotation of the support plate 21 along the circumferential direction of the grooves 11, the protrusion 31 can engage with different grooves 11. After being clamped by the upper support plate 21 and the lower support plate 22, maintaining a constant gap between them, the protrusion 31 engages with different grooves 11 during rotation, forming different angles. Scale lines are provided along the circumferential direction of the grooves 11, clearly showing the angle of rotation for easier measurement.

[0028] For further details, please refer to [link / reference]. Figure 1 and Figure 2 The set square body 1 is a right triangle, and the pivot 5 is located on the center line of the set square body 1, with the pivot 5 positioned near the right-angle vertex of the set square body 1. Figure 1 This is a structural diagram of the backing plate in its initial position, where the backing plate coincides with one of the right-angled sides. This is the common usage. Figure 2 This is a schematic diagram of the support plate after rotation. The angle of the grooves varies depending on the number of grooves 11. Generally, the more grooves there are, the smaller the angle change between adjacent grooves, and the higher the precision.

[0029] Furthermore, the grooves are spherical, and the grooves can be connected by arc grooves. The protrusions 31 are also set to be arc-shaped, so that they are not easy to get stuck when moving.

[0030] For more details, please refer to Figure 4The elastic column 3 includes a housing 32 and an elastic body 33 disposed within the housing. The protrusion 31 is a ball that is engaged with the housing 32. The protrusion 31 is connected to the elastic body 33 and can compress the elastic body 33. The housing 32 is detachably fixed to the backing plate 2. The protrusion 31 is an iron ball, with at least half of it engaged within the housing 32. The protrusion 31 can roll freely on the housing 32, reducing friction. The elastic body 33 can preferably be a spring, or other elastic material, thus constantly pushing the protrusion 31 away from the housing 32. The housing 32 has space to accommodate the protrusion 31, and when pushed by an external force, the protrusion 31 can continue to retract into the housing 32.

[0031] Furthermore, see Figure 3 The upper back plate 21 has an upper protrusion 211 on the side near the triangle ruler body 1, and a lower protrusion 221 on one side of the triangle ruler body 1. The elastic post 3 is disposed on the upper protrusion 211. This reduces the area of ​​the back plate 2 obstructing the triangle ruler body 1, thus reducing the contact area. At least one of the lower back plate 22 and the upper back plate 21 is provided with an elastic post 3. Preferably, elastic posts 3 are provided on both sides of the back plate 2, so that a corresponding groove 11 is also provided on the lower back plate 22, resulting in less wear during movement.

[0032] In an optional embodiment, see [link to relevant documentation] Figure 1 and Figure 3 The upper support plate 21 and the lower support plate 22 are fixed to the side away from the rotating shaft 5 by bolts 4. The bolts 4 control the tightness of the upper support plate 21 and the lower support plate 22, and need to be adjusted to the optimal tightness before use. If it is too tight, the support plates will be too difficult to move, resulting in excessive wear. If it is too loose, the support plates will move too easily, making them difficult to fix, thus affecting the surveying accuracy.

[0033] Furthermore, the distance between the centerline of the bolt 4 and the centerline of the rotating shaft 5 should be less than or equal to the length of the right-angled side of the triangle ruler body 1, and preferably equal. This controls the rotation angle of the backplate to 0-90°, preventing it from rotating 360°.

[0034] In an optional embodiment, to further meet practical needs, the set square is configured to be multifunctional; see [reference needed]. Figure 1 The set square body 1 is provided with triangular holes 12, round holes 13, and rectangular holes 14. These holes can be used for marking or for hanging on the wall for storage. The set square body 1 is also provided with arc grooves 15, which are distributed along the arc direction formed by the grooves 11. Angle scale lines are distributed along the arc grooves 15 on the set square body 1. Marking can be done through the arc grooves, and angles can also be observed by looking at the intersection of the backrest and the arc groove 15, meeting different user needs.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A set square comprising a set square body (1) and a backboard (2) rotatably arranged on the set square body (1); characterized in that: The backrest (2) includes an upper backrest (21) and a lower backrest (22). The triangle ruler body (1) is disposed between the upper backrest (21) and the lower backrest (22). One side of the upper backrest (21) and the lower backrest (22) is fixed to the triangle ruler body (1) by a pivot (5), and the other side can be locked together. The triangle ruler body (1) is provided with circumferentially distributed grooves (11). The upper backrest (21) is provided with an elastic column (3), and the elastic column (3) is provided with a protrusion (31). When the backrest (2) rotates along the circumferential direction distributed by the grooves (11), the protrusion (31) can be inserted into different grooves (11).

2. A set square according to claim 1, wherein: The elastic column (3) includes a housing (32) and an elastic body (33) disposed inside the housing; the protrusion (31) is a ball that is locked on the housing (32), and the protrusion (31) is connected to the elastic body (33) and can compress the elastic body (33).

3. A set square according to claim 2, wherein: The upper back plate (21) has an upper protrusion (211) on the side near the triangle ruler body (1), and the lower back plate (22) has a lower protrusion (221) on the side near the triangle ruler body (1). The elastic column (3) is located on the upper protrusion (211).

4. A set square according to claim 1, wherein: The triangle body (1) is a right triangle, and the pivot (5) is set on the center line of the triangle body (1). The pivot (5) is set on the side close to the right angle vertex of the triangle body (1).

5. A set square according to claim 4, wherein: The upper back plate (21) and the lower back plate (22) are fixed away from the rotating shaft (5) by bolts (4). The distance between the center line of the bolt (4) and the center line of the rotating shaft (5) is less than or equal to the length of the right-angle side of the triangle ruler body (1).

6. A set square according to claim 1, wherein: The triangle ruler body (1) is provided with a triangular hole (12), a round hole (13) and a rectangular hole (14).

7. A set square according to claim 1, wherein: The triangle ruler body (1) is provided with an arc groove (15), the arc groove (15) is distributed along the arc direction formed by the groove (11), and angle scale lines are distributed along the arc groove (15) on the triangle ruler body (1).

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