Drawing compass

Abstract

The utility model discloses a compass for drawing, including arc drawing part and center of circle positioning part, the arc drawing part includes first support foot, first nut, metal spring piece and first adjusting screw, and the center of circle positioning part includes second support foot, second adjusting screw, clamp, contact pin and second nut. The utility model discloses a first adjusting screw, and the replacement of pencil or ink pipe is more easily realized, plays the position adjustment and clamping effect, and it is more intuitive, accurate and fast to operate, and simultaneously, through second adjusting screw, the relative stability of arc drawing part and center of circle positioning part position can be made, and the stability of drawing process radius is improved.

Description

Technical Field

[0001] This utility model relates to the field of drafting tools, and in particular to a compass for drafting. Background Technology

[0002] Compasses are commonly used tools in manual drafting. When using them, it is necessary to adjust the alignment between the pencil tip and the top of the pin. There are two types of compasses: one involves loosening the locking nut, adjusting the lead extension length, and then tightening the locking nut; the other involves pressing the lead feed button to adjust the lead extension length. In actual operation, both types of compasses have the problem of repeated adjustment. In addition, when drawing small circles, the radius will change due to uneven force, resulting in irregular arcs. Furthermore, it is impossible to trim the pencil lead after it becomes dull. Utility Model Content

[0003] The purpose of this invention is to address the deficiencies in the aforementioned technology by providing a drafting compass to solve the problems existing in the prior art.

[0004] The purpose of this utility model is achieved as follows:

[0005] A compass for drafting includes an arc drawing part and a center positioning part. The arc drawing part includes a first leg, a first nut, a metal spring, and a first adjusting screw. The first leg includes a circular sleeve, and the first nut is fixed to the first leg by riveting. The metal spring has a circular mounting hole and an elastic part. The circular mounting hole is fitted onto the screw of the first adjusting screw, and the elastic part is engaged within the circular sleeve of the first leg. The first adjusting screw and the nut are connected in a cooperative manner. The center positioning part includes a second leg, a second adjusting screw, a clamp, a pin, and a second nut. The pin is riveted to the second leg and fixed by the clamp. The second nut is fixed to the second leg by riveting, and the second adjusting screw and the second nut are connected in a cooperative manner.

[0006] In one possible implementation, the arc drawing part and the center positioning part are riveted together by a first rivet, and both the arc drawing part and the center positioning part can rotate around the axis of the first rivet.

[0007] In one possible implementation, the first leg of the arc drawing part is provided with an inner arc structure, and the second leg of the center customization part is provided with an outer arc structure, wherein the inner arc structure and the outer arc structure are adapted to each other.

[0008] In one possible implementation, the arc drawing part further includes a metal friction plate and a second rivet, wherein the first leg and the metal friction plate are riveted together by the second rivet.

[0009] Compared with the prior art, this utility model has the following advantages:

[0010] This invention allows for easy replacement of the pencil or ink cartridge (including the outer sleeve) via the first adjusting screw, serving as a position adjustment and clamping mechanism. Operation is more intuitive, precise, and quick. Simultaneously, the second adjusting screw ensures relative stability of the arc drawing section and the center positioning section, improving the stability of the radius during the drawing process. The pencil lead can be utilized from the remaining portion after writing, increasing pencil utilization. Furthermore, the pencil lead can be trimmed with a pencil sharpener, further enhancing lead utilization and the aesthetics of the drawing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 Schematic diagram of the structure of the arc drawing part Figure 1 .

[0013] Figure 3 Schematic diagram of the structure of the arc drawing part Figure 2 .

[0014] Figure 4 Schematic diagram of the structure of the arc drawing part Figure 3 .

[0015] Figure 5 Schematic diagram of the structure of the arc drawing part Figure 4 .

[0016] Figure 6 Schematic diagram of the center positioning part Figure 1 .

[0017] Figure 7 Schematic diagram of the center positioning part Figure 2 .

[0018] Figure 8 Schematic diagram of the center positioning part Figure 3 .

[0019] Reference numerals: 10-Arc drawing part, 11-First support leg, 12-Metal friction plate, 13-Second rivet, 14-Pencil, 15-Metal spring, 16-First nut, 17-First adjusting screw, 18-Ink tube, 19-Outer sleeve, 20-Center positioning part, 21-Second support leg, 22-Second adjusting screw, 23-Clamp, 24-Pin, 25-Second nut, 3-First rivet. Detailed Implementation

[0020] The following description, in conjunction with the accompanying drawings, further illustrates this implementation case:

[0021] Depend on Figure 1-8As shown, a drafting compass includes an arc drawing section 10 for drawing arc curves and a center positioning section 20 for determining the center position. The arc drawing section 10 and the center positioning section 20 are riveted together by a first rivet 3. After riveting, the arc drawing section 10 and the center positioning section 20 maintain a transition fit, ensuring that they are neither loose nor unable to easily rotate around the axis of the first rivet 3 under external force.

[0022] Depend on Figure 2 As shown, the inner arc structure of the first leg 11 in the arc drawing part 10 is composed of... Figure 3 As shown, the outer arc structure of the second leg 21 in the center positioning part 20 further ensures that the arc drawing part 10 and the center positioning part 20 can rotate around the axis of the first rivet 3 under the action of external force.

[0023] like Figure 2 As shown, the arc drawing part 10 includes a first support 11 and a metal friction plate 12, which are tightly riveted together by a second rivet 13. The upper surface of the metal friction plate 12 can be brushed to increase surface roughness. The cylindrical structure on the upper part of the first support 11 facilitates gripping when drawing arcs. It also includes a metal spring 15, a first nut 16, and a first adjusting screw 17. The round hole of the metal spring 15 fits onto the screw of the first adjusting screw 17, and the spring part is inserted into the groove of the first support 11, that is, into the gap after the round sleeve on the first support 11 is inserted into the pencil. It also includes a pencil 14 or an ink tube 18, which includes an outer sleeve 19. Loosening the first adjusting screw 17 allows the pencil 14 or ink tube 18 to be inserted into or removed from the round sleeve on the first support 11 or to move up and down. Tightening the first adjusting screw 17 increases the metal spring. The contact pressure between the metal spring 15 and the pencil 14 or ink tube 18 reliably clamps the pencil 14 or ink tube 18 onto the first support leg 11, thereby achieving the purpose of replacing, adjusting the position, and clamping the pencil 14 or ink tube 18. Even when the first adjusting screw 17 is fully loosened, there is still a small contact pressure between the metal spring 15 and the pencil 14 or ink tube 18, ensuring that the pencil 14 or ink tube 18 does not fall out of the sleeve on the first support leg 11 quickly under the action of gravity. The function of the outer sleeve 19 is to reduce the difference in outer diameter between the pencil 14 and the ink tube 18 by using a soft sleeve, since ink tubes on the market are often short and thick with an outer diameter smaller than that of the pencil. This improves the versatility of the sleeve on the first support leg 11. The first nut 16 is fixed to the first support leg 11 by riveting, and the adjustment function is achieved by screwing the first adjusting screw 17 into the first nut 16.

[0024] like Figure 3As shown, the center positioning part 20 includes a second support leg 21, a clamp 23, and a pin 24. The pin 24 is inserted into the round hole on the second support leg 21 and then riveted, and then secured with the clamp 23. It also includes a second adjusting screw 22 and a second nut 25. The second nut 25 is fixed to the second support leg 21 by riveting. The second adjusting screw 22 is screwed into the screw hole on the second nut 25. Tightening the second adjusting screw 22 can increase the contact pressure between the second adjusting screw 22 and the metal friction plate 12, thereby increasing the friction force when the arc drawing part 10 and the center positioning part 20 rotate. Therefore, when drawing a small circle, tightening the second adjusting screw 22 can better ensure the stability of the relative position between the arc drawing part 10 and the center positioning part 20, and prevent the drawn arc from deforming.

[0025] In summary, the working principle of this utility model is as follows:

[0026] When a user needs to draw a circle or arc, they loosen the second adjusting screw 22, rotate the arc drawing part 10 to obtain the desired arc radius, and then tighten the second adjusting screw 22. The tightening force can be less for a larger arc radius and more for a smaller arc radius. Then, the pin 24 is aligned with the center to draw the circle. When a user needs to replace the pencil 14 or ink cartridge 18, or adjust the position of the pencil 14 or ink cartridge 18, they first loosen the first adjusting screw 17, remove, insert, or move the pencil 14 or ink cartridge 18, and then slowly tighten the first adjusting screw 17. It should be noted that when aligning the pencil tip with the top of the pin 24, first ensure the pencil 14 or ink cartridge 18 is in a slightly higher position, then bring the arc drawing part 10 and the center positioning part 20 together, stand the compass vertically on the plane, and have the pin 24 contact the plane. At this time, the tip of the pin 24 is approximately on the axis of the sleeve on the first support 11, so simply push the pencil 14 or ink cartridge 18 down until the tip contacts the plane.

[0027] The contact pressure between the metal spring 15 and the pencil 14 or ink tube 18 can be adjusted by rotating the first adjusting screw 17, which is the clamping force, so as to achieve the purpose of replacement, adjustment and clamping; the contact pressure between the second adjusting screw 22 and the metal friction plate 12 can be adjusted by rotating the second adjusting screw 22, so as to achieve the purpose of relative rotation or relative position fixation between the arc drawing part 10 and the center positioning part 20.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

Claims

1. A compass for drafting, characterized in that, The device includes an arc drawing section and a center positioning section. The arc drawing section includes a first leg, a first nut, a metal spring, and a first adjusting screw. The first leg includes a circular sleeve, and the first nut is fixed to the first leg by riveting. The metal spring has a circular mounting hole and a spring portion. The circular mounting hole is fitted onto the screw of the first adjusting screw, and the spring portion is engaged within the circular sleeve of the first leg. The first adjusting screw and the nut are connected in a cooperative manner. The center positioning section includes a second leg, a second adjusting screw, a clamp, a pin, and a second nut. The pin is riveted to the second leg and fixed by the clamp. The second nut is fixed to the second leg by riveting, and the second adjusting screw and the second nut are connected in a cooperative manner.

2. The compass for drafting according to claim 1, characterized in that, The arc drawing part and the center positioning part are riveted together by a first rivet, and both the arc drawing part and the center positioning part can rotate around the axis of the first rivet.

3. The compass for drafting according to claim 2, characterized in that, The first leg of the arc drawing part is provided with an inner arc structure, and the second leg of the center customization part is provided with an outer arc structure. The inner arc structure and the outer arc structure are adapted to each other.

4. The compass for drafting according to claim 1, characterized in that, The arc drawing part also includes a metal friction plate and a second rivet, and the first leg and the metal friction plate are riveted together by the second rivet.

Images