Pet leading rope with self-defense function

Abstract

The utility model provides a pet leading rope with self-defense function, which comprises a shell, a leading rope, a telescopic rod for self-defense and a detachable connecting structure. One end of the leading rope is connected to the shell, and the other end is provided with a lock buckle. The detachable connecting structure is arranged between the telescopic rod and the shell, and is used for detachably fixing the telescopic rod on the shell and realizing quick separation of the two. The utility model integrates the telescopic rod which can be quickly disassembled on the main body of the leading rope, and organically combines the basic leading function with the active self-defense function. Since the self-defense assembly is directly arranged on the leading rope shell, the user does not need to additionally carry an independent self-defense tool, and the problem of space occupation and inconvenience in use of the traditional leading rope self-defense product is solved. Meanwhile, the quick separation mechanism realized through the detachable connecting structure enables the user to quickly take down and stretch the telescopic rod for effective protection when encountering an emergency, greatly shortens the emergency response time, and significantly improves the safety guarantee during dog walking.

Description

Technical Field

[0001] This utility model relates to the field of pet supplies technology, specifically to a pet leash with self-defense function. Background Technology

[0002] With the continuous expansion of the pet-owning population, pet leashes have become an indispensable tool for dog walking. Traditional leashes typically consist of a rope body, a winding mechanism, a handle, and a connecting buckle. Their function is mainly limited to controlling the pet's activity range and preventing it from getting lost, resulting in a single function that cannot meet the diverse safety and protection needs in dog walking scenarios.

[0003] In practical use, users often face the safety threat of sudden approach or even attack from unfamiliar aggressive dogs. Traditional leashes lack active protection or deterrent designs, leaving users with little choice but to passively evade or shout for help when encountering such dangers, which can easily lead to injury to themselves or their pets. Although some users may carry additional self-defense tools such as telescopic batons or pepper spray, these devices are separate from the leash, taking up valuable carrying space and making emergency access cumbersome, with a response speed that cannot meet the requirements for immediate protection.

[0004] In existing technologies, some functionally extended pet leashes also fail to effectively address the aforementioned active self-defense needs. For example, the Chinese utility model patent "A Pet Leash with a Garbage Bag" (application number 202220933208.9, authorization announcement number CN217389670U) discloses a detachable storage tube at the bottom of the leash housing, achieving a dual function of "leash + garbage collection," thus improving the convenience of daily use. However, it does not involve any safety protection mechanism and cannot cope with emergencies such as dog attacks. Furthermore, the "open the lid to retrieve the bag" operation method in this solution is slow to respond and is not suitable for protective scenarios requiring rapid response.

[0005] In conclusion, existing pet leashes are still relatively limited in function, lacking effective means of active self-defense and failing to fully meet users' dual core needs for "basic leash" and "immediate self-defense" during dog walking. Therefore, there is an urgent need for a new type of pet leash that is compact, easy to assemble and disassemble, and organically combines leash and self-defense functions to fill the current technological gap in the market. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a pet leash with a self-defense function that is compact in structure, easy to operate, and can simultaneously realize pet leash and emergency self-defense functions, in view of the above-mentioned technical status.

[0007] The technical solution adopted by this utility model to solve the above problems is as follows: a pet leash with self-defense function includes a shell and a leash. One end of the leash is connected to the shell, and the other end extends to the outside of the shell and is provided with a buckle. It also includes a telescopic rod for self-defense and repelling and a detachable connection structure. The detachable connection structure is located between the telescopic rod and the shell and is used to detachably fix the telescopic rod to the shell. The telescopic rod can be immediately separated from the shell through the detachable connection structure.

[0008] To improve the reliability and ease of operation of the connection structure and provide clear locking feedback, preferably, the detachable connection structure includes a connecting part on the housing and two telescopic lock heads at the end of the telescopic rod. The connecting part includes two oppositely arranged connecting walls with corresponding through holes. The telescopic lock heads are elastic structures that can be pressed and rebounded. When the telescopic rod is in a fixed state, the telescopic lock heads extend and fit into the through holes of the two connecting walls to form a lock. After pressing the telescopic lock heads to retract from the outside to the inside and disengage from the through holes, the telescopic rod can be separated from the housing.

[0009] To ensure the synchronicity and stability of the telescopic lock head's movement and to simplify the internal structure for easy assembly, preferably, a connecting tube is transversely inserted through the end of the telescopic rod, and the two telescopic lock heads are respectively assembled at both ends of the connecting tube and partially exposed outside the connecting tube. A compression spring is provided inside the connecting tube between the two telescopic lock heads, and a limiting ring is provided on the inner wall of the end of the connecting tube to restrict the corresponding telescopic lock head from disengaging outward from the connecting tube.

[0010] To improve the neatness and portability of the product during storage and to prevent the telescopic rod from swaying during daily traction, preferably, the telescopic rod can rotate around the axis of the two through holes. When the telescopic rod rotates around the axis and flips to the state of the adjacent housing, the housing is provided with a retaining ring adapted to the telescopic rod. The retaining ring is used to lock and fix the telescopic rod after it is in the adjacent housing.

[0011] To reduce the difficulty of aligning the telescopic lock head with the through hole of the connecting wall and to improve the pressing feel and the positioning reliability of the spring, preferably, the outward end of the telescopic lock head forms a hemispherical head, and the inward end is provided with a groove for the end of the compression spring to be inserted and positioned. The inner side of the connecting wall is also provided with a guide groove extending from the end face to the through hole.

[0012] In order to balance the effectiveness of self-defense tools with the convenience of daily carrying, and to enable the telescopic baton to quickly switch between short storage and extended use, preferably, the telescopic baton has a multi-section nested structure that can be stretched axially to form a long rod, and the telescopic lock is located at the end of the innermost small rod of the telescopic baton.

[0013] To provide an alternative connection solution with clear operational feedback and high connection strength to meet different user preferences, preferably, the detachable connection structure includes a connecting cylinder on the housing and two opposing protrusions on the outer circumferential surface of the telescopic rod end. The inner wall of the connecting cylinder is provided with two corresponding slots. The protrusions can be inserted into the connecting cylinder from the outside to the inside and engage with the slots to achieve detachable fixing of the telescopic rod and the housing.

[0014] To optimize the operation path of the rotary snap-fit ​​connection structure, achieve rapid connection and separation, and prevent accidental loosening during use, preferably, the slot includes a release slot extending axially along the connecting cylinder to its end face, and a locking slot extending circumferentially along the connecting cylinder and communicating with the release slot; after the protrusion is inserted through the release slot, rotating the telescopic rod can cause the protrusion to be engaged in the locking slot to form a fixed position, and after rotating in the opposite direction, the protrusion can be released along the release slot to achieve separation.

[0015] To further enhance the stability and security of the rotary snap-fit ​​connection in the locked state and prevent the telescopic rod from falling off due to accidental rotation, preferably, the locking groove is also provided with a limiting protrusion to prevent the protrusion from accidentally disengaging from the locking groove to the release groove.

[0016] To provide a simple, versatile, and more stable detachable solution, as a supplement to the aforementioned solution, preferably, the detachable connection structure includes a connecting cylinder on the housing, the inner wall of the connecting cylinder is provided with an internal thread, and the outer periphery of the end of the telescopic rod is provided with an external thread adapted to the internal thread, so that the telescopic rod and the housing can be detachably fixed through the threaded engagement of the internal and external threads.

[0017] Compared with existing technologies, the advantages of this invention are as follows: By incorporating a detachable connecting structure and an integrated telescopic bar into the pet leash shell, a structural fusion of leash and self-defense functions is achieved. Since the telescopic bar is directly fixed to the outside of the leash shell via the detachable connecting structure, users do not need to carry separate self-defense tools while walking their dogs, solving the problems of traditional leash self-defense items being space-consuming and inconvenient to access. Simultaneously, the detachable connecting structure allows for immediate separation of the telescopic bar from the shell, enabling users to quickly remove and extend the telescopic bar for effective deterrence and protection in the event of a sudden danger, greatly shortening emergency response time and fundamentally overcoming the safety risks associated with traditional leashes that only allow for passive avoidance and the delayed access to additional self-defense tools. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1;

[0019] Figure 2 This is a schematic diagram of the structure of the telescopic rod after rotation in Example 1;

[0020] Figure 3 This is a schematic diagram of the structure after the telescopic rod is removed in Example 1;

[0021] Figure 4 This is a schematic diagram of the decomposed state structure of Example 1;

[0022] Figure 5 This is a cross-sectional structural diagram of Example 1;

[0023] Figure 6 This is a three-dimensional structural diagram of the telescopic rod after it has been extended in Example 1;

[0024] Figure 7 This is a three-dimensional structural schematic diagram of Example 2;

[0025] Figure 8 This is a schematic diagram of the decomposed state structure of Example 2;

[0026] Figure 9 This is a schematic diagram of the decomposed state structure of Example 3. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] Figures 1-9 The figures shown represent three specific embodiments of this utility model.

[0029] The pet leash with self-defense function in Examples 1 to 3 mainly includes a shell 1, a leash 2, a buckle 3, a telescopic bar 4, and a detachable connection structure 5 (available in three forms: telescopic lock type, protruding pin groove type, and threaded type). Through the synergistic structure of "detachable connection and fixation + multi-section nested telescopic + emergency quick separation", combined with the connection form design adapted to different scenarios, it effectively solves the problems of existing pet leashes lacking self-defense function, inconvenient emergency tool carrying, and difficulty in balancing the stability and convenience of the connection structure. At the same time, through the precise adaptation of each component and material optimization, it takes into account both daily leash portability and emergency self-defense reliability, meeting the safety protection and leash needs of pets when they go out.

[0030] Example 1 (Retractable connection structure with telescopic lock head)

[0031] The structure and connection relationship of each component in Example 1 are as follows:

[0032] Casing 1: Reference Figure 1 and Figure 2As shown, the housing 1 can be a high-strength plastic injection molded part with a hollow interior forming a receiving cavity for installing core components such as the traction rope winding reel. The outer wall of the housing 1 is integrally formed with a connecting part 5a and a retaining ring 6. The connecting part 5a includes two parallel rectangular connecting walls 5a1, with a circular through hole 5a2 corresponding to the center of each connecting wall 5a1. The two through holes 5a2 are collinear to ensure coaxiality accuracy. The inner side of the connecting wall 5a1 also has a guide groove 5a3 extending from the end face to the through hole 5a2. The guide groove 5a3 has a width that matches the diameter of the hemispherical head 5b1 of the telescopic lock head 5b. The retaining ring 6 is an arc-shaped elastic buckle, integrally formed with elastic material beside the connecting part 5a, with its opening facing the flipping direction of the telescopic rod 4. The inner diameter of the buckle matches the outer rod of the telescopic rod 4, used to secure the telescopic rod 4 adjacent to the housing 1.

[0033] Tow rope 2 and lock 3: Reference Figure 1 and Figure 2 As shown, the leash 2 is a high-strength braided rope, made using a multi-strand braiding process, possessing excellent tensile strength. One end of the leash 2 is fixed to a reel inside the housing 1 via fasteners. This reel has a conventional ratchet structure, allowing for manual length adjustment and positioning. The other end extends to the outside of the housing 1 and is secured to a buckle 3 via a metal crimp sleeve. The buckle 3 is a stainless steel spring buckle, which can be opened and closed by pressing. Once engaged, it provides reliable connection strength and is used for detachable connection with a pet collar or harness.

[0034] Telescopic rod 4: Reference Figure 1 and Figure 5As shown, the telescopic rod 4 is a multi-section coaxial nested metal rod made of lightweight, high-strength metal. It includes an outer rod, a middle rod, and a small rod, with the diameter of each section decreasing sequentially. A clearance fit design ensures smooth, uninterrupted extension and retraction. When extended, the telescopic rod 4 forms a long rod suitable for self-defense; when retracted, its length is significantly shortened. The detachable connection structure 5 in Embodiment 1 includes a connecting tube 4a, two telescopic locking heads 5b, and a compression spring 4b. The connecting tube 4a is a hollow metal tube that passes through the through hole of the small rod of the telescopic rod 4 and is fixed to each other. Annular limiting rings 4c are provided on the inner walls of both ends of the connecting tube 4a to prevent the telescopic locking heads 5b from detaching from the connecting tube 4a. There are two telescopic locking heads 5b, each cylindrical in shape with a diameter that matches the through hole 5a2. One end of the telescopic lock head 5b is integrally formed into a hemispherical head 5b1, which facilitates guidance and force distribution during pressing; the other end has a cylindrical groove 5b2, which fits into the end of the compression spring 4b. The outer periphery of the telescopic lock head 5b also has an annular step, which cooperates with the limiting ring 4c to achieve anti-disengagement limiting. The compression spring 4b is a metal compression spring, located inside the connecting tube 4a, with both ends inserted into the grooves 5b2 of the two telescopic lock heads 5b respectively. In its natural state, the spring provides radially outward elastic support to the two telescopic lock heads 5b, so that the hemispherical head 5b1 of the telescopic lock head 5b is exposed at both ends of the connecting tube 4a.

[0035] The working principle of the pet leash with self-defense function in Example 1 is as follows:

[0036] 1. Daily Storage and Leashing: Press the hemispherical heads 5b1 of the two telescopic lock heads 5b to retract them into the connecting tube 4a, overcoming the elastic force of the compression spring 4b. Insert the connecting tube 4a along with the telescopic lock heads 5b between the two connecting walls 5a1, ensuring that the telescopic lock heads 5b are aligned with the through holes 5a2. After releasing the telescopic lock heads 5b, the compression spring 4b elastically returns, pushing them outward and locking them into the through holes 5a2, thus fixing the telescopic rod 4 to the housing 1. Then, rotate the telescopic rod 4 around the axis of the two through holes 5a2, flipping it to the position adjacent to the housing 1. The retaining ring 6 elastically deforms and engages with the outer rod of the telescopic rod 4, completing the storage and fixing. At this time, the buckle 3 connects to the pet collar, and the length of the leash 2 can be adjusted by retracting the reel to achieve normal leashing.

[0037] 2. Emergency Self-Defense State: In case of danger, manually bend the telescopic rod 4 to allow the retaining ring 6 to elastically deform and disengage from the outer rod of the telescopic rod 4, releasing it from its storage fixation. Simultaneously press the hemispherical heads 5b1 of the two telescopic lock heads 5b to retract them and disengage them from the through hole 5a2, thus quickly separating the telescopic rod 4 from the housing 1. Hold the outer rod of the telescopic rod 4 and stretch each section of the rod axially to form a long rod for self-defense and repelling. After use, push the sections of the rod in the opposite direction to retract them, and press the telescopic lock head 5b again to engage it in the through hole 5a2, completing the reset and fixation.

[0038] Example 2 (Detachable connection structure with protruding pin slot)

[0039] refer to Figure 7 and Figure 8 As shown, the basic structure of the shell 1 in Embodiment 2 is the same as that in Embodiment 1, the main difference being the detachable connecting structure 5. The outer wall of the shell 1 has a first connecting cylinder 7 integrally formed. The first connecting cylinder 7 is a cylindrical body and can be integrally formed with the shell 1. Two symmetrical slots 7a are formed on the inner wall of the first connecting cylinder 7, evenly spaced circumferentially. Each slot 7a includes a release slot 7a1 and a locking slot 7a2. The release slot 7a1 extends axially along the first connecting cylinder 7 to the end face, providing a channel for the insertion of the protrusion 8; the locking slot 7a2 extends circumferentially along the first connecting cylinder 7 and communicates with the bottom of the release slot 7a1. An elastic limiting protrusion 7a3 is integrally formed in the locking slot 7a2 near the release slot 7a1. This protrusion has a raised structure to prevent the protrusion 8 from accidentally detaching from the locking slot 7a2 towards the release slot 7a1.

[0040] In Example 2, the traction rope 2 and the locking buckle 3 are completely consistent with the structure, material, and connection method of Example 1, ensuring stable and consistent traction performance. The main structure of the telescopic rod 4 in Example 2 is the same as in Example 1, consisting of a multi-section coaxial nested metal rod. The difference lies in the outer circumference of the mounting end of the telescopic rod 4, which has two oppositely arranged protrusions 8 fixed by welding. The protrusions 8 are cylindrical, with a diameter adapted to the width of the slot 7a. The axes of the two protrusions 8 are collinear and intersect perpendicularly with the axis of the telescopic rod 4. The ends of the protrusions 8 are rounded to facilitate sliding within the slot 7a.

[0041] The working principle of the pet leash with self-defense function in Example 2 is as follows:

[0042] 1. Daily Storage and Traction State: Align the retracted telescopic rod 4 with the port of the first connecting cylinder 7, aligning the two protrusions 8 with the two release grooves 7a1 on the inner wall of the first connecting cylinder 7. Push the telescopic rod 4 axially, causing the protrusions 8 to insert into the bottom along the release grooves 7a1. Then rotate the telescopic rod 4, causing the protrusions 8 to slide along the locking groove 7a2. When the protrusions 8 pass the elastic limiting protrusion 7a3, the limiting protrusion 7a3 prevents the protrusions 8 from sliding in the opposite direction, thus fixing the telescopic rod 4 to the housing 1.

[0043] 2. Emergency self-defense mode: In case of danger, rotate the telescopic rod 4 in the opposite direction to apply external force, causing the protrusion 8 to press and pass over the limiting protrusion 7a3. The protrusion 8 slides along the locking groove 7a2 to the release groove 7a1, and then pulls the telescopic rod 4 outward along the release groove 7a1 to achieve rapid separation. The telescopic rod 4 can be stretched into a long rod shape for self-defense. After use, retract each section of the rod and follow the steps of "aligning with the release groove 7a1 and inserting - rotating to lock into the locking groove 7a2" to complete the reset and fixation.

[0044] Example 3 (Threaded detachable connection structure)

[0045] refer to Figure 9 As shown, the basic structure of the shell 1 in Embodiment 3 is the same as that in Embodiment 1. The main difference lies in the detachable connecting structure 5. The outer wall of the shell 1 is integrally formed with a second connecting cylinder 9. The second connecting cylinder 9 is a cylindrical body and can be integrally formed with the shell 1. The inner wall of the second connecting cylinder 9 is machined with an internal thread 9a; the port of the second connecting cylinder 9 is chamfered to facilitate the engagement and insertion of the external thread 4d of the telescopic rod 4. The traction rope 2 and the buckle 3 are also completely identical in structure, material, and connection method to those in Embodiment 1, ensuring the uniformity of the traction function in different embodiments. The outer circumferential surface of the mounting end of the telescopic rod 4 is machined with an external thread 4d, which is a thread adapted to the internal thread 9a of the second connecting cylinder 9, and the thread accuracy meets the engagement requirements.

[0046] The working principle of the pet leash with self-defense function in Example 3 is as follows:

[0047] 1. Daily Storage and Traction State: Align the retracted telescopic rod 4 with the port of the second connecting cylinder 9, aligning the external thread 4d with the internal thread 9a. Rotate the telescopic rod 4 clockwise to gradually engage the threads until the end face of the small rod of the telescopic rod 4 presses firmly against the bottom of the second connecting cylinder 9, thus securing the telescopic rod 4 to the housing 1. At this point, the telescopic rod 4 fits snugly against the housing 1 without affecting the normal operation of the traction function.

[0048] 2. Emergency self-defense mode: In case of danger, rotate the telescopic rod 4 in the reverse direction to gradually disengage the external thread 4d from the internal thread 9a, and remove the telescopic rod 4 from the second connecting cylinder 9. Extend the telescopic rod 4 to a long rod shape for self-defense and repelling; after use, retract each section of the rod and rotate it in the forward direction to re-engage the threads and complete the reset and fixation.

[0049] It should be noted that in the description of this embodiment, the terms "axial," "radial," "circumferential," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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 this utility model. The terms "installation," "connection," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A pet leash with self-defense function, comprising a housing (1) and a leash (2), wherein one end of the leash (2) is connected to the housing (1), and the other end extends to the outside of the housing (1) and is provided with a buckle (3), characterized in that: It also includes a telescopic baton (4) for self-defense and repelling, and a detachable connection structure (5). The detachable connection structure (5) is located between the telescopic baton (4) and the housing (1) and is used to detachably fix the telescopic baton (4) to the housing (1). The telescopic baton (4) can be immediately separated from the housing (1) through the detachable connection structure (5).

2. The pet leash with self-defense function according to claim 1, characterized in that: The detachable connection structure (5) includes a connection part (5a) on the housing (1) and two telescopic lock heads (5b) at the end of the telescopic rod (4). The connection part (5a) includes two oppositely arranged connection walls (5a1), and through holes (5a2) are correspondingly opened on the two connection walls (5a1). The telescopic lock head (5b) is an elastic structure that can be pressed and rebounded. When the telescopic rod (4) is in a fixed state, the telescopic lock head (5b) extends out and fits into the through hole (5a2) of the two connecting walls (5a1) to form a lock. After pressing the telescopic lock head (5b) to retract from the outside to the inside and disengage from the through hole (5a2), the telescopic rod (4) can be separated from the shell (1).

3. The pet leash with self-defense function according to claim 2, characterized in that: The end of the telescopic rod (4) is transversely provided with a connecting tube (4a). The two telescopic lock heads (5b) are respectively assembled at both ends of the connecting tube (4a) and partially exposed outside the connecting tube (4a). The connecting tube (4a) is provided with a compression spring (4b) located between the two telescopic lock heads (5b). The inner wall of the end of the connecting tube (4a) is provided with a limiting ring (4c) to restrict the corresponding telescopic lock head (5b) from disengaging outward from the connecting tube (4a).

4. The pet leash with self-defense function according to claim 3, characterized in that: The telescopic rod (4) can rotate around the axis of the two through holes (5a2). When the telescopic rod (4) rotates around the axis and flips to the state of adjacent housing (1), the housing (1) is provided with a retaining ring (6) that is adapted to the telescopic rod (4). The retaining ring (6) is used to lock and fix the telescopic rod (4) after it is adjacent to the housing (1).

5. The pet leash with self-defense function according to claim 3, characterized in that: The telescopic lock head (5b) has a hemispherical head (5b1) at its outward end and a groove (5b2) at its inward end for the end of the compression spring (4b) to be inserted and positioned. The inner side of the connecting wall (5a1) is also provided with a guide groove (5a3) extending from the end face to the through hole.

6. The pet leash with self-defense function according to claim 2, characterized in that: The telescopic rod (4) has a multi-section nested structure and can be stretched along the axis to form a long rod. The telescopic lock head (5b) is located at the end of the innermost small rod of the telescopic rod (4).

7. The pet leash with self-defense function according to claim 1, characterized in that: The detachable connection structure (5) includes a first connecting cylinder (7) on the housing (1) and two opposing protrusions (8) on the outer circumferential surface of the end of the telescopic rod (4). The inner wall of the first connecting cylinder (7) is provided with two corresponding slots (7a). The protrusions (8) can be inserted into the first connecting cylinder (7) from the outside to the inside and are engaged with the slots (7a) to achieve detachable fixing of the telescopic rod (4) and the housing (1).

8. The pet leash with self-defense function according to claim 7, characterized in that: The slot (7a) includes a release slot (7a1) extending axially along the first connecting cylinder (7) to its end face, and a locking slot (7a2) extending circumferentially along the first connecting cylinder (7) and communicating with the release slot (7a1); after the protrusion (8) is inserted through the release slot (7a1), rotating the telescopic rod (4) can make the protrusion (8) be locked into the locking slot (7a2) to form a fixed position, and after rotating in the opposite direction, the protrusion (8) can be dislodged along the release slot (7a1) to achieve separation.

9. The pet leash with self-defense function according to claim 8, characterized in that: The locking groove (7a2) is also provided with a limiting protrusion (7a3) for preventing the protrusion (8) from accidentally disengaging from the locking groove (7a2) toward the release groove (7a1).

10. The pet leash with self-defense function according to claim 1, characterized in that: The detachable connection structure (5) includes a second connecting cylinder (9) provided on the housing (1). The inner wall of the second connecting cylinder (9) is provided with an internal thread (9a). The outer periphery of the end of the telescopic rod (4) is provided with an external thread (4d) that is adapted to the internal thread (9a). The telescopic rod (4) and the housing (1) are detachably fixed through the threaded engagement of the internal thread (9a) and the external thread (4d).

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