Iron compasses with pencil lead insertion leg

Abstract

The utility model discloses an iron compass with a lead core insertion leg, and relates to the field of circular curve drawing. The compasses solve the problem that when a pen point of an existing compasses is used for drawing a circular curve, the pen point is gradually thickened, and the drawing precision is low. One end of a compasses supporting leg and one end of a connecting rod are hinged to a rotating shaft, a compasses point is rotationally connected with the other end of the compasses supporting leg so that a circular curve with the diameter smaller than 10 mm can be drawn, and a pencil lead inserting leg assembly is inserted into the other end of the connecting rod; the pencil lead inserting leg assembly comprises an inserting leg, a connecting sleeve and a pencil lead clamping piece, the upper end of the inserting leg is rotationally connected with the other end of the connecting rod, the pencil lead clamping piece is inserted into the lower portion of the inserting leg, the pencil lead is inserted into the pencil lead clamping piece, the connecting sleeve is screwed on the outer side of the lower portion of the inserting leg, and the clamping portion of the pencil lead clamping piece clamps the pencil lead in the screwing process of the connecting sleeve. The circular curve drawing device is used for drawing circular curves in the drawing process.

Description

Technical Field

[0001] The utility model relates to the technical field of circular curve drawing, in particular to an iron compass with a lead core insert, which is used for drawing a circle or an arc. Background Art

[0002] In mathematics and drafting, a compass is a tool used to draw circles or arcs, often used in ruler and compass construction. A compass is typically made of metal and consists of two legs connected by a hinge at one end. By moving the legs, the size of the drawn circle or arc can be adjusted.

[0003] A compass is usually composed of a pen tip, a rotating shaft, compass legs, a compass tip, etc. The lower end of the pen tip is inserted and connected to the upper end of the pen body, the lower end of the pen body is threadedly connected to the upper end of the pen tip, and the lower end of the compass legs is clamped and connected to the upper end of the compass tip.

[0004] Currently, commonly used pen tips use the same diameter as the pencil lead. This thickens over time, causing the drawing surface to become dark and untidy. Furthermore, when drawing multiple concentric circles close together, lines can overlap or become difficult to distinguish, leading to low drawing accuracy.

[0005] In summary, when drawing a circular curve with the existing compass tip, the tip gradually becomes thicker, resulting in low drawing accuracy. Utility Model Content

[0006] The utility model aims to solve the problem of low drawing accuracy of the existing compass tip when drawing circular curves due to the gradual thickening of the tip, and further provides an iron compass with a lead core insert.

[0007] The technical solution of the utility model is:

[0008] A compass with a lead leg comprises a pen tip, a connecting piece and a rotating shaft, wherein the rotating shaft is mounted at the lower end of the connecting piece, and the pen tip is vertically mounted at the upper end of the connecting piece. The compass also comprises a compass leg, a compass tip, a connecting rod and a lead leg assembly, wherein one end of the compass leg and one end of the connecting rod are hinged on the rotating shaft, the compass tip and the other end of the compass leg are rotatably connected to achieve the drawing of a circular curve with a diameter less than 10 mm, and the lead leg assembly is inserted into the other end of the connecting rod; the lead leg assembly comprises a leg, a connecting sleeve and a lead clamp, wherein the upper end of the leg is rotatably connected to the other end of the connecting rod, the lead clamp is inserted into the lower part of the leg, the lead is inserted into the lead clamp, the connecting sleeve is screwed onto the outer side of the lower part of the leg, and the clamping portion of the lead clamp clamps the lead during the screwing process of the connecting sleeve.

[0009] Furthermore, it also includes a connecting component, through which the compass tip and the other end of the compass leg are rotatably connected.

[0010] Furthermore, the connecting assembly includes a screw and a nut, the other end of the compass leg is processed with a notch in its length direction, and the screw passes through the other end of the compass leg with the compass tip inserted and is tightened by the nut.

[0011] Preferably, the insert leg is a hollow structure along its length direction, and a groove is provided on the upper portion of the insert leg in the length direction, and a boss is provided at the middle and lower portion of the insert leg, and the boss is processed with an external thread.

[0012] Furthermore, the connecting sleeve includes a cylinder and a cone, and the cylinder and the cone are sequentially connected from top to bottom and formed into one body.

[0013] Furthermore, an internal thread is processed on the cylinder, and the length of the boss is smaller than the length of the cylinder.

[0014] Furthermore, the lead core clamping piece includes a connecting section, a transition section and a clamping portion, and the connecting section, the transition section and the clamping portion are sequentially connected from top to bottom and formed into one piece.

[0015] Preferably, a limit platform is processed on the connecting section.

[0016] Furthermore, the clamping portion is a three-claw clamping portion, and when the clamping portion is clamped, the outer contour shape is an inverted frustum.

[0017] Furthermore, it also includes a double-headed screw and an adjusting wheel. The adjusting wheel is screwed on the middle part of the double-headed screw, and the double-headed screw is screwed on the upper part of the compass legs and the connecting rod respectively. Driven by the adjusting wheel, the compass legs and the connecting rod move closer or farther away at the same time.

[0018] Furthermore, it also includes a lead core protection sleeve, which is inserted into the insertion leg, and the lower end of the lead core protection sleeve is connected to the connecting section through a limiting platform.

[0019] Compared with the prior art, the present invention has the following effects:

[0020] 1. The utility model provides a lead plug assembly, on which an automatic lead is inserted. Since the lead is used to draw circular curves, the phenomenon of the lead becoming thicker during the drawing process is effectively avoided, thereby ensuring the drawing accuracy of two adjacent circular curves that are close to each other, and the drawing layout is clearer and neater.

[0021] 2. The compass tip 5 of the present invention is rotatably connected to the other end of the compass leg 4. By adjusting the position of the compass tip 5, it is possible to draw a smaller circle. Generally, the diameter of the drawn circle is less than about 10 mm, making the drawing process easier and more convenient.

[0022] 3. The present invention adopts a double-headed screw 8 and an adjusting wheel 9, which can ensure that the distance between the compass legs 4 and the connecting rod 6 can be adjusted at the same time, and under the action of the adjusting wheel 9, accurate fine-tuning can be achieved.

[0023] 4. When the connecting sleeve A-2 of the present invention is screwed onto the plug leg A-1, the inner side wall of the cone A-7 contacts the clamping portion A-9 of the lead core clamping piece A-3. As the connecting sleeve A-2 is screwed, the clamping portion A-9 is gradually clamped. When the clamping portion A-9 is clamped, the lead core is clamped.

[0024] 5. The utility model provides a lead core protection sleeve 10 in the plug leg A-1. The lead core is inserted into the lead core protection sleeve 10, which ensures that the lead core will not break after long-term use, thereby increasing the service life of the lead core. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of the lead core plug leg assembly A after being cut open;

[0027] Figure 3 is a top view of the connecting sleeve A-2;

[0028] Figure 4 yes Figure 3 Cross-sectional view of the house;

[0029] Figure 5 This is a schematic diagram of the external structure of the plug leg A-1;

[0030] Figure 6 is a cross-sectional view of the lead core leg assembly A;

[0031] Figure 7 It is a schematic structural diagram of the lead core clamp A-3.

[0032] Wherein: 1. Pen tip, 2. Connector, 3. Rotating shaft, 4. Compass leg, 5. Compass tip, 6. Connecting rod, 7. Connecting assembly, 7-1. Screw, 7-2. Nut, 8. Double-ended screw, 9. Adjusting wheel, 10. Lead core protection sleeve;

[0033] A. Lead core plug leg assembly, A-1. Plug leg, A-2. Connecting sleeve, A-3. Lead core clamping piece, A-4. Groove, A-5. Boss, A-6. Cylinder, A-7. Cone, A-8. Transition section, A-9. Clamping part, A-10. Limiting platform, A-11. Connecting section. DETAILED DESCRIPTION

[0034] Specific implementation method 1: Combination Figures 1 to 7 The present embodiment includes a pen tip 1, a connecting member 2, and a rotating shaft 3. The rotating shaft 3 is mounted at the lower end of the connecting member 2, and the pen tip 1 is vertically mounted at the upper end of the connecting member 2. The pen tip 1 also includes a compass leg 4, a compass tip 5, a connecting rod 6, and a lead leg assembly A. One end of the compass leg 4 and one end of the connecting rod 6 are hinged on the rotating shaft 3. The compass tip 5 is rotatably connected to the other end of the compass leg 4 to achieve the drawing of a circular curve with a diameter of less than 10 mm. The lead leg assembly Part A is inserted into the other end of the connecting rod 6; the lead core plug leg assembly A includes a plug leg A-1, a connecting sleeve A-2 and a lead core clamping member A-3. The upper end of the plug leg A-1 is rotatably connected to the other end of the connecting rod 6, the lead core clamping member A-3 is inserted into the lower part of the plug leg A-1, the lead core is inserted into the lead core clamping member A-3, the connecting sleeve A-2 is screwed onto the outer side of the lower part of the plug leg A-1, and the clamping part A-9 of the lead core clamping member A-3 clamps the lead core during the screwing process of the connecting sleeve A-2.

[0035] The lead core plug leg assembly A in this embodiment is detachably connected during actual use, and the lead core can also be replaced.

[0036] In addition, compared with the existing mechanical pencil structure, the lead plug assembly A of this embodiment effectively saves space and does not block the drawing area during the drawing process, providing convenient conditions for drawing and ensuring the quality and speed of circular curve drawing.

[0037] Specific implementation method 2: Combination Figure 1 and Figure 2 To illustrate this embodiment, this embodiment further includes a connecting assembly 7 , through which the compass tip 5 and the other end of the compass leg 4 are rotatably connected.

[0038] With this arrangement, the position of the compass tip 5 can be adjusted by adjusting the connecting assembly 7. For drawing smaller-diameter arcs, there's already a certain distance between the compass legs 4 and the connecting rod 6. When the compass tip 5 is rotatably connected to the compass legs 4, the distance between the compass tip 5 and the lead on the lead leg assembly A shortens, allowing the drawing of very small-diameter arcs or circles. The remaining components and connections are the same as those in the first embodiment.

[0039] Specific implementation method three: Combination Figures 1 to 2 To illustrate this embodiment, the connecting assembly 7 of this embodiment includes a screw 7-1 and a nut 7-2. The other end of the compass leg 4 is processed with a notch in its length direction. The screw 7-1 passes through the other end of the compass leg 4 with the compass tip 5 inserted and is tightened by the nut 7-2.

[0040] Such a configuration has a simple structure and is convenient and quick to screw. Other components and connection relationships are the same as those in the first or second embodiment.

[0041] One end of the screw 7-1 in this embodiment is the large end, which is clamped on the compass leg 4 and serves as a limit for the compass leg 4. The nut 7-2 is screwed on the other end of the screw 7-1, and serves as a connection and fixation between the compass leg 4 and the compass tip 5.

[0042] Specific implementation method four: Combination Figures 5 and 6 To illustrate this embodiment, the plug leg A-1 of this embodiment is a hollow structure along its length direction, and a groove A-4 is provided on the upper part of the plug leg A-1 in the length direction, and a boss A-5 is provided in the middle and lower part of the plug leg A-1, and the boss A-5 is processed with an external thread.

[0043] With this arrangement, the lead core holder A-3 and the lead core protection sleeve 10 can be conveniently placed inside the hollow structure of the plug leg A-1, saving space. The other components and connection relationships are the same as any one of the specific embodiments 1 to 3.

[0044] The groove A-4 in this embodiment is a rectangular groove, which is convenient for insertion into the lower end of the connecting rod 6. The external thread on the boss A-5 is used for threaded connection with the connecting sleeve A-2.

[0045] Specific implementation method five: Combination Figures 3 and 4 To explain this embodiment, the connecting sleeve A-2 comprises a cylindrical body A-6 and a cone A-7, which are connected sequentially from top to bottom to form a single unit. This arrangement allows cone A-7 to contact the lower portion of clamping portion A-9 during the screwing process. As the screwing height increases, the space reserved for clamping portion A-9 decreases until clamping portion A-9 is firmly clamped. The remaining components and connections are identical to those of any of the first to fourth embodiments.

[0046] Specific implementation method six: combination Figure 4 To illustrate this embodiment, an internal thread is processed on the cylinder A-6 of this embodiment, and the length of the boss A-5 is smaller than the length of the cylinder A-6.

[0047] In this configuration, the length of the boss A-5 is smaller than that of the cylinder A-6, saving material and weight, and serving as a connection between the cylinder A-6 and the boss A-5. The other components and connection relationships are the same as any one of the specific embodiments 1 to 5.

[0048] Specific implementation method seven: combination Figure 7To describe this embodiment, the lead holder A-3 comprises a connecting section A-11, a transition section A-8, and a clamping portion A-9. These sections are sequentially connected from top to bottom and integrated into a single piece. This arrangement allows the connecting section A-11 to connect to the lead protective sleeve 10. The outer circumferential surface of the transition section A-8 is a hollow columnar structure, serving as a transition. This also ensures the structural strength of the clamping portion A-9 when in a clamped or relaxed state for extended periods, thereby increasing its service life. The remaining components and connections are identical to those of any of the first through sixth embodiments.

[0049] Specific implementation method eight: combination Figure 7 To explain this embodiment, a limiting platform A-10 is processed on the connecting section A-11 of this embodiment, and the clamping part A-9 is a three-claw clamping part. When the clamping part A-9 is clamped, the outer contour shape is an inverted truncated cone. With this arrangement, when the three-claw clamping part is in the clamping state, the inner hole shape formed by it is triangular or cylindrical, and the contact between it and the lead can be point contact, line contact, or surface contact. When the inner hole shape is triangular, the contact between it and the lead is point contact. If the inner hole shape is cylindrical, the contact between it and the lead is line contact or surface contact. In actual use, surface contact has the best clamping and protection effect for the lead. The other components and connection relationships are the same as any one of the specific embodiments one to seven.

[0050] The outer contour shape in this embodiment is an inverted frustum, which facilitates contact with the inner wall of the cone A-7, ensuring the firmness of clamping the lead core.

[0051] Specific implementation method nine: Combination Figures 1 to 2 This embodiment also includes a double-threaded screw 8 and an adjustment wheel 9. The adjustment wheel 9 is screwed onto the middle portion of the double-threaded screw 8, which is screwed onto the upper portions of the compass legs 4 and the connecting rod 6, respectively. Driven by the adjustment wheel 9, the compass legs 4 and the connecting rod 6 move toward or away from each other simultaneously. This arrangement facilitates simultaneous adjustment of the distance between the compass legs 4 and the connecting rod 6. The remaining components and connections are identical to those of any of the first to eighth embodiments.

[0052] Specific implementation method ten: Combination Figure 6 This embodiment also includes a lead protection sleeve 10, which is inserted into the insert leg A-1. The lower end of the lead protection sleeve 10 is connected to the connecting section A-11 via a stopper A-10. This arrangement effectively protects the lead from vibration or the possibility of the compass being accidentally dropped, which could cause the lead to break and shatter. The remaining components and connections are the same as those in any of the first to ninth embodiments.

[0053] Combine Figures 1 to 7The iron compass of the utility model has the following functions in actual working process:

[0054] 1. The utility model can realize drawing of a circle or arc with a smaller diameter by adopting a rotation connection between the compass legs and the compass tip, so that the drawing of an arc with a smaller diameter can be realized.

[0055] 2. The utility model can realize simultaneous two-way adjustment of the distance between the connecting rod and the compass legs. During the adjustment process, the adjustment efficiency is high and the adjustment speed is fast.

[0056] 3. The utility model can realize drawing circles or arcs with a lead as thin as an automatic lead pencil.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An iron compass with a lead core insert, comprising a pen tip (1), a connecting member (2) and a rotating shaft (3), wherein the rotating shaft (3) is mounted at the lower end of the connecting member (2), and the pen tip (1) is vertically mounted at the upper end of the connecting member (2), characterized in that: It also includes a compass leg (4), a compass tip (5), a connecting rod (6) and a lead core leg assembly (A). One end of the compass leg (4) and one end of the connecting rod (6) are hinged on the rotating shaft (3); the compass tip (5) and the other end of the compass leg (4) are rotatably connected to achieve the drawing of a circular curve with a diameter less than 10 mm; the lead leg assembly (A) is inserted into the other end of the connecting rod (6); The lead plug leg assembly (A) comprises a plug leg (A-1), a connecting sleeve (A-2) and a lead clamping piece (A-3). The upper end of the plug leg (A-1) is rotatably connected to the other end of a connecting rod (6). The lead clamping piece (A-3) is inserted into the lower part of the plug leg (A-1). The lead is inserted into the lead clamping piece (A-3). The connecting sleeve (A-2) is screwed onto the outer side of the lower part of the plug leg (A-1). The clamping portion (A-9) of the lead clamping piece (A-3) clamps the lead when the connecting sleeve (A-2) is screwed.

2. The iron compass with lead core legs according to claim 1, characterized in that: It also includes a connecting assembly (7), and the compass tip (5) and the other end of the compass leg (4) are rotatably connected via the connecting assembly (7).

3. The iron compass with lead core legs according to claim 2, characterized in that: The connecting assembly (7) comprises a screw (7-1) and a nut (7-2). The other end of the compass leg (4) is processed with a notch in its length direction. The screw (7-1) passes through the other end of the compass leg (4) on which the compass tip (5) is inserted and is then tightened by the nut (7-2).

4. The iron compass with lead core legs according to claim 3, characterized in that: The plug leg (A-1) is a hollow structure along its length direction, and a groove (A-4) is provided on the upper part of the plug leg (A-1) in the length direction, and a boss (A-5) is provided in the middle and lower part of the plug leg (A-1), and the boss (A-5) is processed with an external thread.

5. The iron compass with lead core legs according to claim 4, characterized in that: The connecting sleeve (A-2) comprises a cylinder (A-6) and a cone (A-7), and the cylinder (A-6) and the cone (A-7) are sequentially connected from top to bottom and made into one body.

6. The iron compass with lead core legs according to claim 5, characterized in that: An internal thread is processed on the cylinder (A-6), and the length of the boss (A-5) is smaller than the length of the cylinder (A-6).

7. The iron compass with lead core legs according to claim 6, characterized in that: The lead core clamp (A-3) comprises a connecting section (A-11), a transition section (A-8) and a clamping portion (A-9). The connecting section (A-11), the transition section (A-8) and the clamping portion (A-9) are sequentially connected from top to bottom and formed into one piece.

8. The iron compass with lead core legs according to claim 7, characterized in that: A limiting platform (A-10) is processed on the connecting section (A-11), the clamping part (A-9) is a three-claw clamping part, and when the clamping part (A-9) is clamped, the outer contour shape is an inverted frustum.

9. The iron compass with lead core legs according to claim 8, characterized in that: The invention also comprises a double-headed screw (8) and an adjusting wheel (9). The adjusting wheel (9) is screwed on the middle part of the double-headed screw (8). The double-headed screw (8) is screwed on the upper part of the compass legs (4) and the connecting rod (6) respectively. Driven by the adjusting wheel (9), the compass legs (4) and the connecting rod (6) are moved closer or farther away at the same time.

10. The iron compass with lead core legs according to claim 9, characterized in that: It also includes a lead core protection sleeve (10), which is inserted into the insertion leg (A-1), and the lower end of the lead core protection sleeve (10) is connected to the connecting section (A-11) through a limiting platform (A-10).

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