Manual breast pump

Abstract

The utility model relates to the technical field of mother and infant feeding, in particular to a manual breast pump which comprises a breast pump body and a suction handle, the breast pump body is connected with a suction cup piece and a milk storage container, the suction cup piece is communicated with the milk storage container, the breast pump body comprises a soft deformation piece, and the suction handle is connected with the soft deformation piece. And when the handle part is lifted, the soft deformation piece elastically resets and drives the pulling part to approach the milk sucking channel, so that the pulling part is far away from the milk sucking channel and drives the soft deformation piece to elastically deform. According to the breast pump, the soft deformation piece capable of deforming to generate negative pressure is adopted on the breast pump main body, the suction force can be elastically adjusted through the characteristic of soft deformation of the soft deformation piece, a suction force buffering effect can be provided for manual suction, suction comfort is generated for breasts when the breast pump is used, and on the basis, the breast pump is convenient to use. The soft deformation piece, the suction cup piece and the milk storage container are detachably installed on the breast pump body, and a user can conveniently detach and clean the breast pump.

Description

Technical Field

[0001] This utility model relates to the field of maternal and infant feeding technology, specifically a manual breast pump. Background Technology

[0002] In the field of maternal and infant feeding, breast pumps are a common auxiliary tool widely used in the daily lives of breastfeeding mothers. Breast pumps can be divided into two types: electric and manual. However, existing electric breast pumps often suffer from weak suction due to space limitations, making it impossible to install a larger air pump. This results in long suction times but low pump volume. Manual breast pumps, on the other hand, use hand suction and can achieve a stronger suction than small air pumps.

[0003] However, existing manual breast pumps also have some shortcomings. For example, some breast pumps use a straight-tube pump method, which makes it difficult to control the suction power, potentially causing discomfort to the breasts during use, and they are also inconvenient to install and clean.

[0004] To address the above shortcomings, we need to develop a manual breast pump to meet the needs of a wide range of users. Utility Model Content

[0005] In view of the aforementioned problems with existing manual breast pumps, such as inflexible suction adjustment, non-compact structure, poor sealing performance, and cumbersome cleaning and maintenance, the technical solution adopted by this utility model to solve these problems is as follows:

[0006] A manual breast pump includes a breast pump body and a suction handle movably connected to the breast pump body. The breast pump body has a suction channel detachably connected to a suction cup for conforming to the user's skin. The breast pump body has a milk storage port detachably connected to a milk storage container for storing milk. The suction cup is hollow and has a through-hole structure, and is connected to the milk storage container via the breast pump body's suction channel.

[0007] The breast pump body includes a flexible deformable part that can deform to generate negative pressure. The pull-out part of the suction handle is located near the suction cup part and is connected to the flexible deformable part. The handle part of the suction handle is located away from the pull-out part.

[0008] When the handle is pressed, the pull-out part moves away from the milk suction channel and causes the soft deformable part to undergo elastic deformation. When the handle is lifted, the soft deformable part elastically returns to its original position and causes the pull-out part to move closer to the milk suction channel.

[0009] As described above, in a manual breast pump, the flexible deformable component includes an elastically deformable suction bowl and a pull rod structure for causing the suction bowl to deform. The suction bowl has a pull rod mounting hole, the pull ring portion of the pull rod structure passes through the pull rod mounting hole and is engaged with the pull-out portion, and the limiting portion of the pull rod structure is engaged with the pull rod mounting hole.

[0010] As described above, a manual breast pump includes a suction cup component comprising a suction cup channel portion for engaging with the milk suction channel and a soft contact portion for conforming to the surface of the breast. The soft contact portion opens outward from the suction cup channel portion in a funnel shape away from the milk suction channel.

[0011] The manual breast pump described above further includes a suction cup dust cover for protecting the suction cup component. The suction cup dust cover is detachably installed on the outside of the suction cup component. The suction cup dust cover includes a bonding protection part for covering and shielding the soft bonding part and a channel protection part for covering and shielding the suction cup channel part. The bonding protection part is provided with protective ears for sealing and surrounding the outer edge of the soft bonding part.

[0012] As described above, in a manual breast pump, the protective part has an anti-adhesion protrusion for preventing the protective part from adhering to the suction cup component. The anti-adhesion protrusion protrudes toward the suction cup component on the side surface of the suction cup dust cover near the suction cup component.

[0013] The manual breast pump described above also includes a breast pump base for stably placing the breast pump. The breast pump base has a base receiving cavity into which the milk storage container extends and is provided with a venting structure for venting.

[0014] As described above, in a manual breast pump, the air-venting structure adopts a groove-shaped structure, which extends outward from a position near the center of the base accommodating cavity.

[0015] Alternatively, the air-venting structure 6 may adopt a perforated structure, with the perforated structure extending vertically through the breast pump base.

[0016] As described above, in a manual breast pump, the wall of the base receiving cavity is provided with a base limiting protrusion for restricting the placement position of the milk storage container. The base limiting protrusion extends from the wall of the base receiving cavity toward the center of the base receiving cavity.

[0017] As described above, in a manual breast pump, the handle is equipped with an anti-slip soft rubber that increases the friction of the user's hand. The anti-slip soft rubber is located on the side of the handle away from the milk storage container. The anti-slip soft rubber is embedded in the soft rubber cavity of the handle, so that the outer surface of the anti-slip soft rubber is smoothly connected and transitioned with the outer surface of the handle.

[0018] As described above, in a manual breast pump, the pull-out part has a locking chamber into which the pull ring part extends. The locking chamber has a through locking groove on the side near the flexible deformable part. The width of the locking groove is greater than the outer diameter of the shaft of the pull ring part but smaller than the outer diameter of the annular structure of the pull ring part.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention uses a flexible deformable component that can generate negative pressure on the breast pump body. Compared with the traditional straight-tube pump, the flexible deformable component can elastically adjust the suction force through its own flexible deformation characteristics, which can provide a suction buffer for manual suction and produce a better suction comfort for the breast during use. In addition, the flexible deformable component, suction cup component and milk storage container can be detachably installed on the breast pump body for easy disassembly and cleaning by the user. Attached Figure Description

[0021] Figure 1 This is a perspective view of a manual breast pump according to the present invention.

[0022] Figure 2 This is one of the cross-sectional views of a manual breast pump according to the present invention.

[0023] Figure 3 This is a second cross-sectional view of a manual breast pump according to the present invention.

[0024] Figure 4 This is one of the three-dimensional exploded views of a manual breast pump according to this utility model.

[0025] Figure 5 This is the second exploded perspective view of a manual breast pump according to the present invention. Detailed Implementation

[0026] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] Example 1:

[0031] like Figures 1 to 5 The manual breast pump shown includes a breast pump body 1 and a suction handle 2 movably connected to the breast pump body 1. The milk inlet 11 of the breast pump body 1 is detachably connected to a suction cup 4 for conforming to the user's skin. The milk storage port 12 of the breast pump body 1 is detachably connected to a milk storage container 3 for storing milk. The suction cup 4 is hollow and has a through-hole structure and is connected to the milk storage container 3 through the milk suction channel 13 of the breast pump body 1.

[0032] The breast pump body 1 includes a flexible deformable part 14 that can deform to generate negative pressure. The pull-out part 21 of the suction handle 2 is located near the suction cup part 4 and is connected to the flexible deformable part 14. The handle part 22 of the suction handle 2 is located away from the pull-out part 21.

[0033] When the handle 22 approaches the breast pump body 1, the pull-out part 21 moves away from the milk suction channel 13 and causes the soft deformation part 14 to undergo elastic deformation. When the handle 22 moves away from the breast pump body 1, the soft deformation part 14 elastically returns to its original position and causes the pull-out part 21 to approach the milk suction channel 13.

[0034] Specifically, in some embodiments, the flexible deformable part 14 is preferably made of a material with good elasticity, such as rubber or silicone. The flexible deformable part 14 is elastically fastened to the breast pump body 1 near the milk suction channel 13. The flexible deformable part 14 extends into the milk suction channel 13 and occupies more than two-thirds of the cross-sectional area of ​​the milk suction channel 13, or the flexible deformable part 14 occupies more than two-fifths of the space of the milk suction channel 13. This structural arrangement can increase the space occupied by the flexible deformable part 14 inside the breast pump body 1. The larger the space occupied, the greater the suction force generated. When the flexible deformable part 14 deforms, it can elastically adjust the suction force through its own flexible deformation characteristics, and the adsorption force acting on the user's skin becomes gentler.

[0035] Before use, the user holds the suction handle 2 and the milk storage container 3, bringing the suction cup 4 close to and fitting it against the breast skin. The nipple is inserted into the hollow through-hole of the suction cup 4 and close to the milk suction channel 13, making the milk suction channel 13 a sealed space. When in use, the handle part 22 of the suction handle 2 is pressed and moves towards the milk storage container 3. Using the lever structure principle, the handle part 22 pries the pull part 21, causing the pull part 21 to move away from the soft deformable part 14. The pull part 21 causes the soft deformable part 14 to undergo elastic deformation towards the outside, creating a negative pressure state inside the milk suction channel 13. The negative pressure state acts on the user's skin, causing the milk to flow out. The milk flows through the milk suction channel 13 and enters the milk storage chamber 32 of the milk storage container 3 for storage, achieving the milk suction effect.

[0036] After a single suction, the user relaxes their hand and removes the pressure applied to the handle 22. Under the influence of the elastic reset of the soft deformation member 14 and the internal negative pressure, the pull-out part 21 is driven by the soft deformation member 14 and moves toward the direction closer to the milk suction channel 13. Utilizing the lever structure principle, the pull-out part 21 pries the handle 22, causing the handle 22 to move away from the milk storage container 3, thus achieving the milk suction reset effect.

[0037] As another embodiment 101 of embodiment 1, in order to solve the problem that milk easily leaks out of the inlet during the breast pumping process, such as Figures 1 to 5 The manual breast pump shown has a milk suction channel 13 set at an upward angle relative to the milk storage container 3. The milk suction channel 13 has a central axis a in the milk inlet section near the milk inlet 11 and a central axis b in the milk storage section near the milk storage port 12. An obtuse angle c is formed between the central axis a and the central axis b. The angle c is between 100 degrees and 150 degrees, and preferably 110 degrees. The upward angle of the milk suction channel 13 helps the milk flow smoothly to the milk storage port 12, preventing milk backflow and leakage during the milk suction process.

[0038] As another embodiment 102 of embodiment 1, in order to facilitate the user's hand gripping and pressing of the suction handle, such as Figures 1 to 5 The manual breast pump shown has a suction handle 2 with a pull-out portion 21 for pulling out a flexible deformable part 14 and a handle portion 22 for pressing by the user's hand. The suction handle 2 is connected to the breast pump body 1 at a hinge position between the pull-out portion 21 and the handle portion 22. The handle portion 22 bends and extends from the hinge position toward the direction close to the milk storage container 3 to form a first handle extension section. The first handle extension section bends and extends away from the flexible deformable part 14 to form a second handle extension section. The bendable extension of the handle portion 22 makes it easy for the user to hold and press, saving effort.

[0039] As another embodiment 103 of embodiment 1, the handle portion 22 of the suction handle 2 is equipped with an anti-slip soft rubber 221 that can increase the friction of the user's hand. The anti-slip soft rubber 221 is located on the side of the handle portion 22 away from the milk storage container 3. The anti-slip soft rubber 221 adopts an embedded structure and is inserted into the soft rubber cavity of the handle portion 22, so that the outer surface of the anti-slip soft rubber 221 is smoothly connected with the outer surface of the handle portion 22. The connection is flush and smooth, so that the user's hand will not feel any protruding foreign objects when pressing. The soft rubber can also enhance the friction and prevent slipping during the pressing process.

[0040] Example 2:

[0041] Based on Example 1, such as Figures 2 to 4 The manual breast pump shown includes a flexible deformable part 14 comprising a flexible deformable suction bowl 141 and a pull rod structure 142 for deforming the suction bowl 141. The suction bowl 141 is bent and recessed from the side of the flexible deformable part 14 near the pull-out part 21 toward the milk storage port 12. A pull rod mounting hole 1411 is provided at the center of the bottom of the suction bowl 141. The pull ring part 1421 of the pull rod structure 142 extends through the pull rod mounting hole 1411 toward the pull-out part 21 and is engaged with the pull-out part 21. The limiting part 1422 of the pull rod structure 142 is engaged with the pull rod mounting hole 1411.

[0042] Specifically, in some embodiments, the pull ring portion 1421 is a pull ring shaft that extends axially along the middle of the limiting portion 1422 for engaging with the suction handle 2. The pull ring portion 1421 has at least two annular structures that protrude from the surface at intervals along the axial direction. The pull-out portion 21 of the suction handle 2 has an engaging chamber into which the pull ring portion 1421 extends. The engaging chamber has a through engaging groove on the side near the flexible deformable member 14. The groove width is greater than the outer diameter of the shaft of the pull ring portion 1421 but smaller than the outer diameter of the annular structure of the pull ring portion 1421. During installation, the engaging groove is inserted between two adjacent annular structures so that the pull-out portion 21 can restrict the axial movement of the pull rod structure 142, so that the pull-out portion 21 can axially drive the pull rod structure 142 when pulling out.

[0043] Specifically, in some embodiments, the limiting part 1422 is a limiting structure provided at the end of the pull rod structure 142 away from the pull-out part 21. The limiting part 1422 includes a fastening structure for limiting its own installation position and a baffle structure for limiting the axial position of the pull rod structure 142. The outer diameter of the baffle structure is larger than the pull rod mounting hole 1411, so that after the pull ring part 1421 passes through the pull rod mounting hole 1411, the baffle structure restricts the pull ring part 1421 from continuing to extend. In use, when the pull-out part 21 drives the suction bowl 141 through the pull rod structure 142, the limiting part 1422 drives the suction bowl 141 to gradually produce elastic deformation from the pull rod mounting hole 1411 to the surrounding area. After a single suction, the suction bowl 141 elastically resets and presses against the limiting part 1422, which drives the pull-out part 21 to move towards the direction close to the milk suction channel 13 via the pull ring part 1421.

[0044] Example 3:

[0045] Based on Example 1, such as Figures 2 to 4 The manual breast pump shown includes a suction cup component 4 comprising a suction cup channel portion 41 for mating with the milk inlet 11 and a soft contact portion 42 for conforming to the surface of the breast. The suction cup channel portion 41 is installed in the milk suction channel 13 by a plug-in or threaded connection. The suction cup channel portion 41 may be made of a rubber, silicone, or plastic material that is harder than the soft contact portion 42 for easy and secure installation. The soft contact portion 42 opens outward from the suction cup channel portion 41 in a funnel shape away from the milk inlet 11. The surface of the funnel shape for conforming to the skin has a curved design. The soft contact portion 42 may be made of a rubber, silicone, or plastic material that is softer than the suction cup channel portion 41 for easy and secure fit and sealing.

[0046] Example 4:

[0047] Based on Example 3, in order to ensure the hygiene of the suction cup component 4 used to adhere to the user's skin, and to reduce external contamination in the breast pumping channel 13, such as Figures 1 to 5The manual breast pump shown also includes a suction cup dust cover 5 for protecting the suction cup component 4. The suction cup dust cover 5 is a thin-walled shielding shell that mimics the shape of the suction cup component 4. Unlike the suction cup component 4, the suction cup dust cover 5 has a recessed sealing structure in the middle. The depth of the recess extends from the middle of the soft-fit portion 42 towards the end of the suction cup channel portion 41, and a rounded thin-walled structure is used near the end of the suction cup channel portion 41. The suction cup dust cover 5 is detachably installed on the outside of the suction cup component 4. The suction cup dust cover 5 includes a fitting cover for covering and shielding the soft-fit portion 42. The suction cup dust cover 51 includes a protective part 51 and a channel protective part 52 for covering and shielding the suction cup channel part 41. The channel protective part 52 is a recessed sealing structure. The protective part 51 is provided with a protective ear 53 for sealing and surrounding the outer edge of the soft adhesive part 42. The suction cup dust cover 5 seals the outer edge of the soft adhesive part 42 through the protective ear 53, making it difficult for external dust to enter the space between the suction cup part 4 and the suction cup dust cover 5. That is, it will not easily enter the position of the suction cup part 4 that is used to adhere to the user's skin, ensuring the hygiene of the position of the suction cup part 4 that adheres to the skin and reducing external pollution.

[0048] More specifically, when using it, the suction cup dust cover 5 can be removed in advance so that the suction cup dust cover 5 is detached from the surface of the suction cup 3, and then the suction cup 3 can be placed close to the body. After the milk is finished and cleaned, the suction cup dust cover 5 can be reattached to the surface of the suction cup 3.

[0049] Example 5:

[0050] Based on Example 4, in order to solve the problem that the suction cup dust cover 5 may be difficult to remove under negative pressure, such as... Figures 1 to 5 The manual breast pump shown has a protective part 51 with an anti-adhesion protrusion 54 to prevent the protective part 51 from adhering to the suction cup part 4, facilitating the removal of the suction cup dust cover 5. The anti-adhesion protrusion 54 protrudes from the side surface of the suction cup dust cover 5 closest to the suction cup part 4 toward the suction cup part 4. That is, the anti-adhesion protrusion 54 extends from the protective part 51 toward the soft adhesive part 42 and touches the surface of the suction cup part 4, so that the protective part 51 and the soft adhesive part 42 are always separated. During use, it can avoid the suction cup dust cover 5 from being difficult to remove due to adhesion and negative pressure, making it convenient for users to disassemble and remove.

[0051] As another embodiment 501 of embodiment 5, the anti-adhesion protrusions 54 are evenly spaced around the center of the adhesion protection part 51, which can effectively prevent local positions of the suction cup dust cover 5 from adhering.

[0052] Example 6:

[0053] Based on Example 1, in order to solve the problem that manual breast pumps are prone to tipping over when not in use due to instability, such as... Figures 1 to 5The manual breast pump shown also includes a breast pump base 6 for stable placement of the breast pump. The breast pump base 6 is preferably made of a flexible and deformable material such as plastic or rubber. The breast pump base 6 has a base receiving cavity 61 into which a milk storage container 3 is inserted. The base receiving cavity 61 is recessed from the top to the bottom of the breast pump base 6. The base receiving cavity 61 is provided with a venting structure 62 for venting. When the milk storage container 3 is inserted into the base receiving cavity 61, the gas inside the base receiving cavity 61 is squeezed out through the venting structure 62, so as to avoid the internal gas from obstructing the placement of the milk storage container 3.

[0054] As another embodiment 601 of embodiment 6, the cavity wall of the base receiving cavity 61 is provided with a base limiting protrusion 63 for limiting the placement position of the milk storage container 3. The base limiting protrusion 63 extends and protrudes from the cavity wall of the base receiving cavity 61 toward the center of the base receiving cavity 61. When the milk storage container 3 is inserted into the base receiving cavity 61, the base limiting protrusion 63 elastically clamps the milk storage container 3, making it difficult for the milk storage container 3 to loosen and avoid the milk storage container 3 from falling due to instability.

[0055] As another embodiment 602 of embodiment 6, the venting structure 62 adopts a groove structure. The groove structure extends outward from the position near the middle of the base receiving cavity 61. In addition to facilitating venting, the groove structure can also reduce the resistance when the milk storage container 3 is inserted into or removed from the base receiving cavity 61.

[0056] As another embodiment 603 of embodiment 6, the venting structure 662 adopts a perforated structure, which runs through the breast pump base 6 from top to bottom, and can also achieve the effect of venting.

[0057] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A manual breast pump, characterized in that: The device includes a breast pump body (1) and a suction handle (2) movably connected to the breast pump body (1). The breast pump body (1) has a suction channel (13) detachably connected to a suction cup (4) for conforming to the user's skin. The breast pump body (1) has a milk storage port (12) detachably connected to a milk storage container (3) for storing milk. The suction cup (4) is hollow and passes through the suction channel (13) and is connected to the milk storage container (3). The breast pump body (1) includes a flexible deformable part (14) that can deform to generate negative pressure. The pull-out part (21) of the suction handle (2) is located near the suction cup part (4) and is connected to the flexible deformable part (14). The handle part (22) of the suction handle (2) is located away from the pull-out part (21). When the handle (22) is pressed, the pull-out part (21) moves away from the milk suction channel (13) and causes the soft deformable part (14) to undergo elastic deformation. When the handle (22) is lifted, the soft deformable part (14) elastically resets and causes the pull-out part (21) to move closer to the milk suction channel (13).

2. A manual breast pump according to claim 1, characterized in that: The flexible deformable component (14) includes an elastically deformable suction cup (141) and a pull rod structure (142) for driving the suction cup (141) to deform. The suction cup (141) has a pull rod mounting hole (1411). The pull ring part (1421) of the pull rod structure (142) passes through the pull rod mounting hole (1411) and is engaged with the pull-out part (21). The limiting part (1422) of the pull rod structure (142) is engaged with the pull rod mounting hole (1411).

3. A manual breast pump according to claim 1, characterized in that: The suction cup component (4) includes a suction cup channel portion (41) for cooperating with the milk suction channel (13) and a soft adhesive portion (42) for adhering to the surface of the breast. The soft adhesive portion (42) opens out from the suction cup channel portion (41) in a funnel-shaped structure in a direction away from the milk suction channel (13).

4. A manual breast pump according to claim 3, characterized in that: It also includes a suction cup dust cover (5) for protecting the suction cup component (4). The suction cup dust cover (5) is detachably installed on the outside of the suction cup component (4). The suction cup dust cover (5) includes an adhesive protection part (51) for covering and shielding the soft adhesive part (42) and a channel protection part (52) for covering and shielding the suction cup channel part (41). The adhesive protection part (51) is provided with protective ears (53) for sealing and surrounding the outer edge of the soft adhesive part (42).

5. A manual breast pump according to claim 4, characterized in that: The bonding protection part (51) has an anti-bonding protrusion (54) for preventing the bonding protection part (51) from bonding with the suction cup part (4). The anti-bonding protrusion (54) protrudes from the side surface of the suction cup dust cover (5) near the suction cup part (4) toward the suction cup part (4).

6. A manual breast pump according to claim 1, characterized in that: It also includes a breast pump base (6) for stable placement of the breast pump, the breast pump base (6) having a base receiving cavity (61) into which the milk storage container (3) extends for storage, the base receiving cavity (61) having an air venting structure (62) for venting.

7. A manual breast pump according to claim 6, characterized in that: The gas-repellent structure (62) adopts a groove-shaped structure, which extends outward from the middle of the base receiving cavity (61); Alternatively, the air-venting structure (62) may adopt a perforated structure, wherein the perforated structure extends vertically through the breast pump base (6).

8. A manual breast pump according to claim 6, characterized in that: The cavity wall of the base receiving cavity (61) is provided with a base limiting protrusion (63) for limiting the placement position of the milk storage container (3). The base limiting protrusion (63) extends from the cavity wall of the base receiving cavity (61) toward the center of the base receiving cavity (61).

9. A manual breast pump according to claim 1, characterized in that: The handle (22) is equipped with an anti-slip soft rubber (221) that can increase the friction of the user's hand. The anti-slip soft rubber (221) is located on the side of the handle (22) away from the milk storage container (3). The anti-slip soft rubber (221) is embedded in the soft rubber cavity of the handle (22) in an embedded structure, so that the outer surface of the anti-slip soft rubber (221) is smoothly connected and transitioned with the outer surface of the handle (22).

10. A manual breast pump according to claim 2, characterized in that: The pull-out part (21) has a locking chamber into which the pull ring part (1421) extends. The locking chamber has a through locking groove on the side near the flexible deformable part (14). The groove width is greater than the outer diameter of the shaft of the pull ring part (1421) but smaller than the outer diameter of the annular structure of the pull ring part (1421).

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