Double-thread safety lock for cover and laser pen

By designing a double-thread safety lock between the pen cover and the main body and adding disassembly steps, the problem of the pen cover being easily removed in the prior art is solved, protection for children and the elderly is achieved, and the safety of the laser pen is improved.

CN223136610UActive Publication Date: 2025-07-22NINGBO DELI TOOLS CO LTD
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Patent Information

Application Number
CN202422597313.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-25
Publication Date
2025-07-22
Estimated Expiration
2034-10-25

AI Technical Summary

Technical Problem

In the prior art, the pen cover is easily removed by a threaded connection, causing children or the elderly to mistakenly turn on high-power laser pens, causing safety hazards.

Method used

A double-threaded safety lock for cover is designed, including the first and second threaded parts. The two threaded parts are threaded at the same time. The difficulty of disassembly is increased by increasing the disassembly steps and preventing children or the elderly from disassemblying.

Benefits of technology

Effectively prevent children or the elderly from accidentally removing the pen cover, reduce the risk of laser pen opening by mistake, and improve the safety of the tool use.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a double thread safety lock for cover and laser pen, the double thread safety lock for cover comprises a first thread part and a second thread part, the first thread part comprises an external thread I arranged on the periphery of the main body and an internal thread I arranged on the inner periphery of the cover body, and the external thread I is in threaded connection with the internal thread I; the second thread part comprises an external thread II arranged on the periphery of the main body and an internal thread II arranged on the inner periphery of the cover body, and the external thread II is in threaded connection with the internal thread II; when the first thread part is in threaded connection, the second thread part is in non-threaded connection, and when the second thread part is in threaded connection, the first thread part is in non-threaded connection, that is, the safety lock structure is provided with two threads, the two threads are not in threaded connection at the same time, the difficulty of mistaken disassembly is increased by increasing the disassembly operation step, and the safety of the safety lock structure is improved. The purposes of preventing children and old people from dismounting and preventing mistaken dismounting are achieved, and the use safety of the tool is improved.
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Description

Technical Field

[0001] The utility model relates to a double-thread safety lock for a cover and a laser pointer adopting such a double-thread safety lock. Background Art

[0002] For most pen-shaped tools with protective covers, the cover body is mainly connected to the head end of the main body by means of threads. The cover body buckles the head end of the main body inside for protection. The cover body and the main body are detachably connected by a single thread. This method is convenient for locking and disassembling, but the cover body can also be easily unscrewed, and there may be a possibility of accidental opening and disassembly. For some special tools such as laser pointers, see Figure 7 , the cover body is installed at one end of the laser head to protect the laser head and can reduce the harm caused by the direct irradiation of the laser beam to the human eye. In order to facilitate the replacement and maintenance of the laser pointer, the cover body is usually designed to be detachable with a single thread. Such a detachable pen cover laser pointer looks like an ordinary writing tool and is easily misused by children or mistaken for a toy, increasing the risk of misuse. Especially when the high-power laser pointer is accidentally turned on when the pen cover is easily disassembled, the risk is relatively high; and in the prior art, the detachable method of the pen cover does not protect vulnerable groups such as children and the elderly. Especially when the pen cover is not correctly locked, it is easy to cause the accidental opening of the laser pointer, and the laser head will emit a strong beam, causing harm to the environment, eyes or other sensitive parts. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a double-thread safety lock for a cover that is convenient for disassembly and can prevent the elderly and children from disassembling and accidentally disassembling, and a laser pointer adopting such a double-thread safety lock.

[0004] To solve the above technical problem, the technical solution of the utility model is: a double-thread safety lock for a cover is provided between the main body and the cover body covering the head end of the main body, and includes a first thread portion and a second thread portion. The first thread portion includes an external thread one provided on the outer periphery of the main body and an internal thread one provided on the inner periphery of the cover body, and the external thread one is threadedly connected with the internal thread one; the second thread portion includes an external thread two provided on the outer periphery of the main body and an internal thread two provided on the inner periphery of the cover body, and the external thread two is threadedly connected with the internal thread two;

[0005] The external thread two is located on the side of the external thread one close to the cover body, and the internal thread one is located on the side of the internal thread two close to the main body; when the external thread one is threadedly connected with the internal thread one, the external thread two and the internal thread two are staggered and not in threaded connection; when the external thread two is threadedly connected with the internal thread two, the external thread one and the internal thread one are staggered and not in threaded connection.

[0006] As a preferred technical solution, the first thread portion and the second thread portion are coaxially arranged.

[0007] As a preferred technical solution, the major diameter of the external thread of the first external thread is greater than or equal to the major diameter of the external thread of the second external thread, and the minor diameter of the internal thread of the first internal thread is greater than or equal to the minor diameter of the internal thread of the second internal thread.

[0008] As a preferred technical solution, the distance between the first internal thread and the second internal thread is greater than or equal to the sum of the distance between the first external thread and the second external thread, the thread segment length of the first external thread, and the thread end length of the second external thread.

[0009] As a preferred technical solution, a transition ring groove is provided between the first internal thread and the second internal thread inside the cover body, and the inner diameter of the transition ring groove is greater than the minor diameters of the first internal thread and the second internal thread.

[0010] As a preferred technical solution, the width of the transition ring groove is greater than the sum of the distance between the first external thread and the second external thread, the thread segment length of the first external thread, and the thread end length of the second external thread.

[0011] As a preferred technical solution, the first external thread and the second external thread are connected in series front and back.

[0012] As a preferred technical solution, the thread helix direction between the first external thread and the first internal thread is the same as or opposite to the thread helix direction between the second external thread and the second internal thread.

[0013] As a preferred technical solution, a laser pointer includes the above-mentioned double-thread safety lock for the cover.

[0014] Due to the adoption of the above technical solution, the beneficial effect of the present utility model is that when the first thread portion is in threaded connection, the second thread portion is not in threaded connection, and when the second thread portion is in threaded connection, the first thread portion is not in threaded connection. That is, such a safety lock structure not only has two threads, and the two threads are not in threaded connection at the same time. By increasing the operation steps of disassembly, the difficulty of accidental disassembly is increased, so as to achieve the purpose of preventing children and the elderly from disassembling and preventing accidental disassembly, and improving the use safety of the tool. Description of the Drawings

[0015] The following drawings are only intended to illustrate and explain the present utility model schematically, and do not limit the scope of the present utility model.

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 is a partial structural cross-sectional view of the main body of an embodiment of the present utility model;

[0018] Figure 3 is a structural sectional view of the cover body in the embodiment of the present utility model;

[0019] Figure 4 is a state diagram when the cover body and the main body in the embodiment of the present utility model are threadedly connected through the first thread portion;

[0020] Figure 5 is a state diagram when the threaded connection of the first thread portion between the cover body and the main body in the embodiment of the present utility model is released and before entering the threaded connection of the second thread portion;

[0021] Figure 6 is a state diagram when the cover body and the main body in the embodiment of the present utility model are threadedly connected through the second thread portion;

[0022] Figure 7 is a schematic diagram of a traditional laser pointer in the background technology;

[0023] In the figure: 10 - main body; 20 - cover body; 30 - first thread portion; 40 - second thread portion; 31 - external thread one; 32 - internal thread one; 41 - external thread two; 42 - internal thread two; 50 - transition ring groove. Detailed implementation manners

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the accompanying drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.

[0025] Embodiment 1:

[0026] A double - threaded safety lock for a cover in this embodiment can be applied to different types of pen - type tools, such as laser pointers, pens, pen - type therapeutic instruments, etc. Among them, as a kind of pen - type tool, the laser pointer includes a laser pointer main body 100 and a laser pointer cover body 200 covering the head end of the laser pointer main body 100. The laser pointer cover body 200 is securely connected through a double - threaded safety lock for a cover in this embodiment to achieve the purpose of preventing the elderly and children from disassembling and preventing accidental disassembly, so as to improve the safety of the laser pointer. In this embodiment, taking the laser pointer as an example, the structure and working principle of a double - threaded safety lock for a cover are described. The structure of the laser pointer is referred to Figure 1 .

[0027] Refer to Figure 1, A double-thread safety lock for the cover is provided between the main body 10 and the cover body 20 covering the head end of the main body 10, including a first thread portion 30 and a second thread portion 40. The first thread portion 30 and the second thread portion 40 are coaxially arranged, and the axial positions of the first thread portion 30 and the second thread portion 40 are discontinuous. That is, when the first thread portion 30 is thread-connected, the second thread portion 40 is not thread-connected, and when the second thread portion 40 is thread-connected, the first thread portion 30 is not thread-connected. Through the cooperative setting of the two threads, a safety lock structure is formed to achieve the effects of preventing children from disassembling and preventing accidental disassembly.

[0028] See Figure 2 and Figure 3 , The first thread portion 30 includes an external thread one 31 provided on the outer periphery of the main body 10 and an internal thread one 32 provided on the inner periphery of the cover body 20, and the external thread one 31 is thread-connected with the internal thread one 32; the second thread portion 40 includes an external thread two 41 provided on the outer periphery of the main body 10 and an internal thread two 42 provided on the inner periphery of the cover body 20, and the external thread two 41 is thread-connected with the internal thread two 42; the external thread two 41 is located on the side of the external thread one 31 close to the cover body 20, and the internal thread one 32 is located on the side of the internal thread two 42 close to the main body 10; when the external thread one 31 is thread-connected with the internal thread one 32, the external thread two 41 and the internal thread two 42 are staggered and not thread-connected; when the external thread two 41 is thread-connected with the internal thread two 42, the external thread one 31 and the internal thread one 32 are staggered and not thread-connected.

[0029] See Figure 2 , The major diameter of the external thread of the external thread one 31 is greater than the major diameter of the external thread of the external thread two 41; See Figure 3 , The minor diameter of the internal thread of the internal thread one 32 is greater than the minor diameter of the internal thread of the internal thread two 42.

[0030] In order to ensure that the first thread portion 30 and the second thread portion 40 cannot be in a thread-connected state at the same time, it is necessary to layout the distance between the threads. The distance between the internal thread one 32 and the internal thread two 42 is greater than or equal to the sum of the distance between the external thread one 31 and the external thread two 41, the thread segment length of the external thread one 31, and the thread end length of the external thread two 41. At this time, a transition space appears between the internal thread one 32 and the internal thread two 42. This transition space is provided between the two thread connections and can insert a pulling action between the two thread rotation actions to achieve the purpose of preventing the elderly and children from disassembling and preventing accidental disassembly.

[0031] Preferably, the first external thread 31 and the second external thread 41 are connected front and back. A transition ring groove 50 is provided between the first internal thread 32 and the second internal thread 42 inside the cover body 20. The inner diameter of the transition ring groove 50 is greater than the minor diameter of the first internal thread 32 and the second internal thread 42. The width of the transition ring groove 50 is greater than the sum of the distance between the first external thread 31 and the second external thread 41, the thread section length of the first external thread 31, and the thread end length of the second external thread 41.

[0032] The thread helix direction between the first external thread 31 and the first internal thread 32 is the same as that between the second external thread 41 and the second internal thread 42.

[0033] The working principle of this embodiment is as follows:

[0034] When installing the cover body 20: First, rotate the cover body 20 or the main body 10, and perform the first thread connection through the first thread portion 30. For the state of the first thread connection, refer to Figure 4 , then continue to rotate one of the parts of the cover body 20 or the main body 10, so that the main body 10 further penetrates into the cover body 20, and the second external thread 41 and the first external thread 31 enter the transition ring groove 50 until the first external thread 31 completely disengages from the first internal thread 32. For the state, refer to Figure 5 ; Then, horizontally pull the cover body 20 or the main body 10 until the second external thread 41 contacts the second internal thread 42, and then slightly apply force to make the cover body 20 and the main body 10 squeeze each other. The second external thread 41 and the second internal thread 42 come into contact, and rotate one of the parts of the cover body 20 or the main body 10 to make the second external thread 41 and the second internal thread 42 start to thread fit until it cannot be tightened further and then stop. At this time, the end of the cover body 20 completely abuts against the shoulder of the main body 10. For the state, refer to Figure 6 ;

[0035] When disassembling the cover body 20: First, separate the second thread portion 40. After the second external thread 41 is completely separated and enters the transition ring groove 50, then slightly apply force to pull the main body 10 and the cover body 20 in the opposite direction to separate the main body 10 and the cover body 20, and make the first external thread 31 contact the first internal thread 32; Finally, rotate one of the parts of the cover body 20 or the main body 10, and the first external thread 31 and the first internal thread 32 are first thread - mated and then completely disengaged. At this time, the cover body 20 and the main body 10 are completely separated.

[0036] The disassembly of the cover 20 includes three steps: (1) rotating the first thread portion 30, (2) pulling the cover 20 and the main body 10 in opposite directions, and (3) rotating the second thread portion 40. Only after these three steps can the cover 20 be completely disassembled. This design method makes it difficult for children and the elderly to disassemble the cover 20 easily, and it is not easily mis-dismantled by adults. In this way, when the laser pointer is working, the cover 20 can effectively protect the laser head, and can reduce the harm caused by the direct irradiation of the strong laser beam to the human eye, improving the safety while ensuring the detachable function of the cover.

[0037] Embodiment 2:

[0038] The structure of this embodiment is basically the same as that of Embodiment 1, and the main differences are as follows: the major diameter of the external thread of the first external thread 31 is equal to the major diameter of the external thread of the second external thread 41, and the minor diameter of the internal thread of the first internal thread 32 is equal to the minor diameter of the internal thread of the second internal thread 42. The working principle of this embodiment is basically the same as that of Embodiment 1, and the difference is that when the cover 20 is installed, the second external thread 41 will first be threadedly connected to the first internal thread 32. As the cover 20 or the main body 10 continues to rotate, after the second external thread 41 is separated from the first internal thread 32, the first external thread 31 will then be threadedly connected to the first internal thread 32; when the cover 20 is disassembled, after the first external thread 31 is separated from the first internal thread 32, as the cover 20 or the main body 10 still needs to continue rotating, the second external thread 41 is separated from the first internal thread 32. After the second external thread 41 is completely separated from the first internal thread 32, the main body 10 and the cover 20 are truly separated.

[0039] Embodiment 3:

[0040] The structure of this embodiment is basically the same as that of Embodiment 1, and the main difference is that the thread helix direction between the first external thread 31 and the first internal thread 32 is opposite to the thread helix direction between the second external thread 41 and the second internal thread 42, that is, the rotation directions of the first thread portion 30 and the second thread portion 40 are opposite, further increasing the difficulty of disassembly.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-thread safety lock for a lid, which is provided between a main body and a lid covering the head end of the main body, and is characterized in that: It includes a first thread portion and a second thread portion. The first thread portion includes an external thread one provided on the outer periphery of the main body and an internal thread one provided on the inner periphery of the cover body, and the external thread one is in threaded connection with the internal thread one; the second thread portion includes an external thread two provided on the outer periphery of the main body and an internal thread two provided on the inner periphery of the cover body, and the external thread two is in threaded connection with the internal thread two. The external thread two is located on the side of the external thread one close to the cover body, and the internal thread one is located on the side of the internal thread two close to the main body; when the external thread one is in threaded connection with the internal thread one, the external thread two and the internal thread two are staggered and not in threaded connection; when the external thread two is in threaded connection with the internal thread two, the external thread one and the internal thread one are staggered and not in threaded connection.

2. The double-thread safety lock for a lid according to claim 1, characterized in that: The first thread portion and the second thread portion are coaxially arranged.

3. The double-thread safety lock for a lid as claimed in claim 1, wherein: The major diameter of the external thread of the external thread one is greater than or equal to the major diameter of the external thread of the external thread two, and the minor diameter of the internal thread of the internal thread one is greater than or equal to the minor diameter of the internal thread of the internal thread two.

4. The double-thread safety lock for a lid according to claim 1, characterized in that: The distance between the internal thread one and the internal thread two is greater than or equal to the sum of the distance between the external thread one and the external thread two, the thread segment length of the external thread one, and the thread end length of the external thread two.

5. The double-thread safety lock for a lid according to claim 4, characterized in that: A transition ring groove is provided in the cover body between the internal thread one and the internal thread two, and the inner diameter of the transition ring groove is greater than the minor diameters of the internal thread one and the internal thread two.

6. The double-thread safety lock for a lid according to claim 5, characterized in that: The width of the transition ring groove is greater than the sum of the distance between the external thread one and the external thread two, the thread segment length of the external thread one, and the thread end length of the external thread two.

7. The double-thread safety lock for the lid according to claim 4, characterized in that: The external thread one and the external thread two are connected front and back.

8. The double-thread safety lock for a lid according to claim 1, characterized in that: The thread helix direction between the external thread one and the internal thread one is the same as or opposite to the thread helix direction between the external thread two and the internal thread two.

9. Laser pointer, characterized in that: It includes a double-thread safety lock for a cover as described in any one of claims 1 to 8.