A lead core retractable compass leg and compass

Abstract

The utility model discloses a lead core can retreat type compass foot and compass, wherein the compass foot, including: penholder, it is the tubular structure of two ends opening, the bottom of penholder is provided with the protective sheath along its axial direction sliding, the cavity of penholder is provided with the sleeve along its axial direction sliding, is equipped with the first spring between the top of protective sheath and sleeve, press the piece, it is along the axial direction of penholder and is inserted and is slidingly arranged on the top of penholder, is equipped with the second spring between the bottom of press the piece and sleeve, wherein, the sleeve is slidably provided with two clamps for holding the lead core, is equipped with the third spring between the clamp and sleeve, the opening of press the piece bottom is equipped with the inclined plane structure for guiding the top of two clamps to draw close, the distance between two clamp top is less than the distance between both bottom. The utility model can reduce the damage that the operation of the lead core clamping state is released to the clamp, guarantees the service life, and improves the flexibility and convenience of use.

Description

Technical Field

[0001] This utility model relates to the field of drawing tools, specifically to a removable lead core compass insert and a compass. Background Technology

[0002] In existing compasses, the lead extension is controlled using a mechanical pencil mechanism for easy replacement of the lead in the legs. Normally, the lead is held in place by an internal clamping mechanism to prevent it from retracting during use. When the lead needs to extend, pressing the top button causes the clamping mechanism to release the lead after it has been extended a certain distance. When the button is stopped, the clamping mechanism resets and clamps the lead again, preventing it from retracting once extended. If the lead extends too far, it directly affects the quality and effectiveness of the drawn lines.

[0003] Mechanical pencil compasses mostly use a guide tube to control the clamping mechanism for the lead core. That is, by pressing, the guide tube is inserted into the clamping mechanism, causing the two clamping pieces in the mechanism to separate and release the lead core. However, because the guide tube moves directly against the inner surface of the clamping pieces during insertion, it is easy to cause wear on the inner surface of the clamping pieces, thereby affecting the clamping strength of the clamping pieces and causing the lead core to retract during use. Utility Model Content

[0004] The purpose of this utility model is to provide a removable lead core compass insert and compass. The removable lead core compass insert and compass can reduce the damage to the clamping plate caused by the operation of releasing the lead core clamping state, ensure service life, and improve the flexibility and convenience of use.

[0005] The technical solution adopted by this utility model to solve the above problems is:

[0006] A removable lead core compass pin includes:

[0007] The pen barrel is a tubular structure with openings at both ends. A protective sleeve is slidably mounted on the bottom end of the pen barrel along its axial direction. A damping sleeve is installed inside the cavity of the protective sleeve. A sleeve is slidably mounted inside the cavity of the pen barrel along its axial direction. Limiting parts are provided at both ends of the pen barrel relative to the movement trajectory of the sleeve. A first spring is provided between the top end of the protective sleeve and the sleeve, with the two ends of the first spring abutting against the protective sleeve and the sleeve respectively.

[0008] The pressing component is inserted along the axial direction of the pen barrel and slidably disposed on the top of the pen barrel. The pressing component is a hollow structure with an open bottom and its top exposed on the pen barrel. A second spring is provided between the bottom of the pressing component and the sleeve, and the two ends of the second spring abut against the pressing component and the sleeve respectively.

[0009] The sleeve has two clips slidably disposed inside for clamping the lead core. The clips are located between the protective sleeve and the pressing member. A third spring is provided between the clips and the sleeve. The two ends of the third spring abut against the clips and the sleeve respectively. A limiting sleeve is provided in the opening at the bottom end of the sleeve to limit the separation between the bottom ends of the two clips. The opening at the bottom end of the pressing member is provided with a bevel structure to guide the top ends of the two clips to approach each other. The distance between the top ends of the two clips is less than the distance between their bottom ends.

[0010] As a further improvement to the above technical solution, the cavity of the limiting sleeve is frustum-shaped, and steel balls are embedded on the side of the clamping piece, with the steel balls pressing against the inner side of the limiting sleeve from the inside out.

[0011] As a further improvement to the above technical solution, the pen barrel includes a barrel body, which is a tubular structure with openings at both ends. The opening diameter at the top of the barrel body is larger than the opening diameter at the bottom. A closed sleeve for preventing the pressing element from detaching from the top of the barrel body is inserted and engaged. The bottom end of the closed sleeve abuts against the pressing element from top to bottom. A pointed sleeve is integrally connected to the bottom end of the barrel body.

[0012] As a further improvement to the above technical solution, a through hole for inserting a lead core is provided on the end face of the top of the pressing member, and the cavity of the pressing member is connected to the through hole.

[0013] As a further improvement to the above technical solution, the opening at the top of the damping sleeve is a flared structure.

[0014] As a further improvement to the above technical solution, the outer surface of the pen barrel is provided with a threaded structure.

[0015] This utility model also provides a compass, comprising:

[0016] The first support rod has a lead core retractable compass pin as described in any of the above technical solutions detachably installed at its bottom end;

[0017] The second support rod has a foot pin at its bottom end, and its top end is hinged to the top end of the first support rod.

[0018] Compared with the prior art, this utility model has the following advantages and effects:

[0019] (1) Through the structural design of the pen barrel and the pressing part, this utility model realizes that after the two clamping pieces clamp and transport the lead core a distance, the clamping piece is released from the other end of the clamping piece by the way of being squeezed. This reduces the damage to the clamping piece caused by the operation of releasing the lead core clamping state, ensures the stability of the clamping piece clamping the lead core, and thus ensures the service life.

[0020] (2) Through the structural arrangement of the sleeve, pressing part, clamp and protective sleeve, this utility model realizes the effect of controlling the extension of the lead core by pressing the pressing part or the protective sleeve, which increases the operation mode and improves the flexibility of use. When the clamp releases the lead core, the lead core can be pushed back, so as to adjust the extension length of the lead core according to the needs of drawing lines, which improves the convenience of use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a lead-core removable compass pin of this utility model.

[0022] Figure 2 This is a schematic side view of the structure of a retractable lead core compass pin according to this utility model.

[0023] Figure 3 This is a schematic cross-sectional view of the structure of a retractable lead core compass pin of this utility model.

[0024] Figure 4 yes Figure 3 The diagram shows an enlarged view of a partial structure inside the rod body.

[0025] Figure 5 This is a schematic diagram of the structure of a compass according to this utility model.

[0026] The components include: pen barrel 1, threaded structure 11, rod body 12, closed sleeve 13, pointed sleeve 14, pressing part 2, inclined structure 21, through hole 22, sleeve 3, limiting sleeve 31, protective sleeve 4, damping sleeve 41, flared structure 42, limiting part 5, first spring 61, second spring 62, third spring 63, clip 7, steel ball 71, first support rod 81, second support rod 82, foot pin 83, and lead core 9. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0028] Example 1.

[0029] See Figures 1-4This embodiment discloses a retractable compass insert, comprising a pen barrel 1 and a pressing member 2. The pen barrel 1 is a tubular structure open at both ends. A sleeve 3 is slidably disposed within the cavity of the pen barrel 1 along its axial direction, and a protective sleeve 4 is slidably disposed at its bottom end along its axial direction. A damping sleeve 41 is provided within the cavity of the protective sleeve 4 to limit excessive extension of the lead core. Limiting portions 5 are provided at both ends of the movement trajectory of the pen barrel 1 relative to the sleeve 3. A first spring 61 is provided between the top end of the protective sleeve 4 and the sleeve 3 to apply a force to the protective sleeve 4 to move it out of the pen barrel 1. The two ends of the first spring 61 abut against the protective sleeve 4 and the sleeve 3, respectively. The pressing member 2 is inserted along the axial direction of the pen barrel 1 and slidably disposed at the top end of the pen barrel 1. The pressing member 2 is a hollow structure open at the bottom end. Its top end is exposed on the pen barrel 1. A second spring 62 is provided between the bottom end of the pressing member 2 and the sleeve 3 to apply a force to the pressing member 2 to move out of the pen barrel 1. The two ends of the second spring 62 abut against the pressing member 2 and the sleeve 3 respectively. Two clips 7 for clamping the lead core are slidably arranged inside the sleeve 3. The clips 7 are located between the protective sleeve 4 and the pressing member 2. A third spring 63 is provided between the clips 7 and the sleeve 3. The two ends of the third spring 63 abut against the clips 7 and the sleeve 3 respectively. A limiting sleeve 31 for limiting the separation between the bottom ends of the two clips 7 is provided in the opening at the bottom end of the sleeve 3. An inclined structure 21 for guiding the top ends of the two clips 7 to approach each other is provided on the opening at the bottom end of the pressing member 2. The distance between the top ends of the two clips 7 is less than the distance between their bottom ends.

[0030] When the lead core needs to extend, press the pressing member 2, causing the second spring 62 to compress and the bottom end of the pressing member 2 to abut against the top ends of the two clamping pieces 7. As the pressing member 2 continues to press down, the two clamping pieces 7 move under the push of the pressing member 2, causing the lead core to extend outward. The third spring 63 is compressed, and the bottom ends of the clamping pieces 7 move outward from inside the limiting sleeve 31. When the inclined structure 21 on the bottom end of the pressing member 2 guides the top ends of the two clamping pieces 7 to approach, the bottom ends of the two clamping pieces 7 separate, and the two clamping pieces 7 release their clamping of the lead core. When the pressing member 2 is stopped, the pressing member 2 resets under the restoring force of the second spring 62, so that the pressing member 2 releases the movement restriction of the two clamping pieces 7. Thus, the two clamping pieces 7 can reset under the restoring force of the third spring 63, and the bottom ends of the two clamping pieces 7 re-approach under the restriction of the limiting sleeve 31 to clamp the lead core, thereby completing the lead core extension operation.

[0031] In addition to the aforementioned extension of the lead core, the protective sleeve 4 can be pressed, causing it to extend inward into the pen barrel 1. At this time, the first spring 61 is compressed, and the lead core is held by the two clips 7. The damping sleeve 41 on the lead core moves inward a certain distance. When the elastic force applied by the first spring 61 is greater than the elastic force applied by the second spring 62, the sleeve 3 moves towards the pressing member 2, the second spring 62 is compressed, and the limiting sleeve 31 releases the restriction that separates the bottom ends of the two clips 7, reducing the clamping strength of the two clips 7 on the lead core. Thus, when the protective sleeve 4 is stopped, it resets under the restoring force of the first spring 61 and extends the lead core via the damping sleeve 41. The sleeve 3 resets under the restoring force of the second spring 62, and the limiting sleeve 31 resumes the restriction that separates the bottom ends of the two clips 7.

[0032] See Figure 1 , Figure 2 The outer surface of the pen barrel 1 is provided with a threaded structure 11, which improves the convenience of installing the pins on the compass.

[0033] See Figure 2 , Figure 3 The pen barrel 1 includes a barrel 12, which is a tubular structure with openings at both ends. The diameter of the opening at the top of the barrel 12 is larger than the diameter of the opening at the bottom, which facilitates the direct insertion of the components inside the barrel 12 and improves the ease of assembly. A closed sleeve 13 is inserted into and engaged at the top of the barrel 12 to prevent the pressing component 2 from detaching from it. The bottom end of the closed sleeve 13 abuts against the pressing component 2 from top to bottom, ensuring the stability of the structural state of the components inside the pen barrel 1 after installation. A pointed sleeve 14 is integrally connected to the bottom end of the barrel 12 to ensure the field of vision for viewing the marks drawn by the lead core.

[0034] See Figure 3 The pressing member 2 has a through hole 22 on its top end face for inserting lead cores. The cavity of the pressing member 2 is connected to the through hole 22. After the lead core is used up, a new lead core can be directly inserted into the through hole 22 for use, which improves the convenience of operation.

[0035] See Figure 4 The cavity of the limiting sleeve 31 is frustoconical, which provides space for the separation between the bottom ends of the two clips 7, thereby ensuring the use effect of the lead core extending by moving into the pen barrel 1 through the protective sleeve 4. The side of the clip 7 is embedded with a steel ball 71, which abuts against the inner side of the limiting sleeve 31 from the inside out, ensuring the limiting sleeve 31 restricts the opening and closing degree between the bottom ends of the two clips 7 through the steel ball 71, thereby ensuring the stability of clamping the lead core.

[0036] See Figure 4The opening at the top of the damping sleeve 41 is a flared structure 42, which facilitates the guidance of the lead core into the damping sleeve 41.

[0037] Example 2.

[0038] See Figure 5 This embodiment provides a compass, including a first support rod 81 and a second support rod 82. The bottom end of the first support rod 81 is detachably equipped with the lead core removable compass pin as described in Embodiment 1. The bottom end of the second support rod 82 is provided with a foot pin 83, and the top end of the second support rod 82 is hinged to the top end of the first support rod 81.

[0039] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A removable lead core compass pin, characterized in that, include: The pen barrel is a tubular structure with openings at both ends. A protective sleeve is slidably mounted on the bottom end of the pen barrel along its axial direction. A damping sleeve is installed inside the cavity of the protective sleeve. A sleeve is slidably mounted inside the cavity of the pen barrel along its axial direction. Limiting parts are provided at both ends of the pen barrel relative to the movement trajectory of the sleeve. A first spring is provided between the top end of the protective sleeve and the sleeve, with the two ends of the first spring abutting against the protective sleeve and the sleeve respectively. The pressing component is inserted along the axial direction of the pen barrel and slidably disposed on the top of the pen barrel. The pressing component is a hollow structure with an open bottom and its top exposed on the pen barrel. A second spring is provided between the bottom of the pressing component and the sleeve, and the two ends of the second spring abut against the pressing component and the sleeve respectively. The sleeve has two clips slidably disposed inside for clamping the lead core. The clips are located between the protective sleeve and the pressing member. A third spring is provided between the clips and the sleeve. The two ends of the third spring abut against the clips and the sleeve respectively. A limiting sleeve is provided in the opening at the bottom end of the sleeve to limit the separation between the bottom ends of the two clips. The opening at the bottom end of the pressing member is provided with a bevel structure to guide the top ends of the two clips to approach each other. The distance between the top ends of the two clips is less than the distance between their bottom ends.

2. The lead-core retractable compass pin according to claim 1, characterized in that: The cavity of the limiting sleeve is frustum-shaped, and steel balls are embedded on the side of the clamping plate. The steel balls abut against the inner side of the limiting sleeve from the inside out.

3. The lead-core retractable compass pin according to claim 1, characterized in that: The pen barrel includes a barrel body, which is a tubular structure with openings at both ends. The diameter of the opening at the top of the barrel body is larger than the diameter of the opening at the bottom. A closed sleeve is inserted into and engaged at the top of the barrel body to prevent the pressing element from detaching from it. The bottom end of the closed sleeve abuts against the pressing element from top to bottom. A pointed sleeve is integrally connected to the bottom end of the barrel body.

4. The lead-core retractable compass pin according to claim 1, characterized in that: The top end face of the pressing component has a through hole for inserting the lead core, and the cavity of the pressing component is connected to the through hole.

5. The lead-core retractable compass pin according to claim 1, characterized in that: The opening at the top of the damping sleeve is a flared structure.

6. The lead-core retractable compass pin according to claim 1, characterized in that: The outer surface of the pen barrel is provided with a threaded structure.

7. A compass, characterized in that, include: The first support rod has a lead core retractable compass pin as described in any one of claims 1-6 detachably mounted on its bottom end; The second support rod has a foot pin at its bottom end, and its top end is hinged to the top end of the first support rod.

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