Luggage pull rod assembly and upper support bracket assembly

Abstract

The utility model relates to a luggage pull rod assembly and pull rod upper support subassembly, including the inner buckle spare of buckle structure on the buckle of seat board and buckle, the seat board has the main panel of L type, and the main panel has the bottom plate and riser, the upper edge of riser is equipped with the apron board, the inner buckle spare has the longitudinal buckle, the support plate and the bottom end buckle, and the inner buckle spare is buckled on the seat board along the bottom end buckle of seat board overturns extension direction, and the left and right ends of longitudinal buckle have horizontal position buckle hook, and the hook hangs on the hooking base of lateral buckle hook and is buckled seat, and with the longitudinal stop head of lateral buckle seat in the longitudinal support cooperation, the bottom end buckle has the bottom side buckle hook, and the hook hangs on the hooking base of lower buckle seat on the bottom plate of seat board, and with the longitudinal stop head of lower buckle seat in the longitudinal support cooperation, the positioning recess on longitudinal buckle, the positioning convex part on riser convex inserts positioning recess. Realize that upper support subassembly is exempted from screw installation to the box shell, and has the advantages such as convenient installation and firm and reliable.

Description

Technical Field

[0001] This utility model relates to the field of luggage, specifically to a luggage handle support assembly for fixing the handle to the luggage shell. Background Technology

[0002] The top of the trolley case has a mounting position for a base plate used to secure the trolley rod. The base plate includes an L-shaped main panel with an outer groove on its side for inserting the handle of the trolley rod when folded. A downward-protruding sleeve (where the bottom of the main panel rests against the case shell) is formed on the bottom of the main panel, and the trolley rod is inserted and secured to the sleeve. A skirt is usually formed along the edge of the main panel, arranged at a 90° angle to the main panel. Because the base plate is connected to the trolley rod, it is typically subjected to the pulling force during operation, thus posing a significant challenge to the structural reliability of the assembled base plate and case shell. Currently, a common method is to have multiple screw posts protruding inwards on the main panel of the base plate. These screw posts pass through positioning holes in the case shell and are screwed on, thus securing the base plate to the case shell. While securing the base plate with multiple screws ensures structural reliability after assembly, the installation efficiency is low. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects of the existing technology and provide a luggage handle support assembly that is easy to install and operate, and is firmly and reliably installed.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A luggage handle support assembly includes a base plate disposed outside the luggage shell. The base plate includes an L-shaped main panel with a skirt plate extending outwardly from the edge of the main panel. The main panel includes a bottom plate and upright plates surrounding the left and right sides and the back of the bottom plate. The bottom plate has a downwardly protruding sleeve portion. The assembly is characterized by further including an inner fastener disposed inside the luggage shell. A snap-fit ​​structure that can extend into the luggage shell is formed on the inner side of the base plate. The inner fastener engages with the snap-fit ​​structure. The snap-fit ​​structure includes lateral snap-fit ​​seats located on the left and right sides of the upright plates and a lower snap-fit ​​seat formed on the bottom plate. Both the lateral snap-fit ​​seats and the lower snap-fit ​​seat include a hook base and a longitudinal anti-detachment head. A positioning protrusion is provided on the upright plate near the skirt plate, protruding in the direction of the skirt plate's flip-out extension.

[0006] The inner fastener has a longitudinal fastener plate that corresponds to and mates with the upright plate. A support plate extends from the upper edge of the longitudinal fastener plate, corresponding to and mates with the skirt plate. A bottom fastener plate extends from the lower edge of the longitudinal fastener plate, corresponding to and mates with the bottom plate. Lateral snap hooks are formed at both ends of the longitudinal fastener plate. A bottom-side snap hook is provided on the bottom-side snapener plate. Both the lateral snap hooks and the bottom-side snap hooks include hook arms protruding towards the direction of extension of the bottom-side snapener plate, with hook heads at the ends of the hook arms. A positioning recess is provided on the longitudinal fastener plate.

[0007] The inner fastener is fastened to the base plate along the flipping extension direction of the bottom fastener plate. The lateral fastening hook is hooked on the hook base of the lateral fastening seat, and the hook arm of the lateral fastening hook and the longitudinal anti-disengagement head of the lateral fastening seat are longitudinally supported. The bottom fastening hook is hooked on the hook base of the lower fastening seat, and the hook arm of the bottom fastening hook and the longitudinal anti-disengagement head of the lower fastening seat are longitudinally supported. The positioning protrusion is inserted into the positioning recess.

[0008] Preferably, the positioning protrusion includes side protrusions located at the left and right ends, and a middle protrusion located between the two side protrusions. Correspondingly, the positioning recess includes side recesses that are inserted into the two side protrusions in a one-to-one correspondence, and a middle recess that is inserted into the middle protrusion.

[0009] Preferably, the side protrusion and the skirt plate are spaced apart to form an insertion interval, the side recess is a recessed cavity, and the side recess has a wall that is inserted into the insertion interval and abuts against the side protrusion.

[0010] Preferably, the side protrusion is provided with an alternative screw insertion hole for screw thread connection, the side concave part has a bottom, and the bottom of the side concave part is provided with a spare through hole, the spare through hole and the alternative screw insertion hole are correspondingly matched.

[0011] Preferably, the central protrusion is integrally formed and connected to the skirt plate, and the central protrusion has a positioning groove. The central recess includes a through hole body extending to the support plate. On the support plate, a stiffening boss is integrally formed and connected to the longitudinal buckle plate at the position corresponding to the through hole body. On the support plate, a positioning tongue is reserved in the through hole body at the thickened part corresponding to the stiffening boss. When the central protrusion is inserted into the through hole body, the positioning tongue is inserted into the positioning groove and abuts against the central protrusion.

[0012] Preferably, the abutment plate extends to the hook arm of the transverse position fastening hook, the abutment plate has a weakened break that breaks the abutment plate, and the weakened break corresponds to the clearance position on the longitudinal fastening plate that avoids the bottom fastening plate. The longitudinal fastening plate at the position corresponding to the weakened break elastically deforms to form the offset of the transverse position fastening hook during the process of hooking the lateral fastening seat.

[0013] Preferably, the longitudinal buckle plate has a thickened wall at the corresponding weakened fracture position to achieve increased thickness, and the abutment plate is integrally formed at the edge of the weakened fracture and connected to the edge reinforcing rib of the longitudinal buckle plate.

[0014] Preferably, the bottom side fastening hook is fork-shaped, and the bottom side fastening hook includes a hook body with hook heads facing each other and elastically deformable. At least two bottom side fastening hooks are provided on the bottom fastening plate, and the bottom plate is provided with a number of lower fastening seats that correspond to and cooperate with the number of bottom side fastening hooks.

[0015] Preferably, the base plate has two sleeve portions located on the left and right sides respectively, and the corresponding bottom end buckle plate has a clearance position that avoids the sleeve portions.

[0016] By adopting the above technical solution, during assembly, the base plate is pre-installed onto the mounting position of the case shell. The snap-fit ​​structure on the base plate extends into the inside of the case shell through a through hole. Then, the inner fastener is snapped onto the snap-fit ​​structure of the base plate. This achieves screwless assembly by clamping and fixing the base plate and inner fastener to the case shell. Although alternative screw holes and corresponding mating structures are designed in further configurations, these are merely for customer use, providing more options and are not essential structural designs. Furthermore, the inner fastener is laterally fastened to the base plate, meaning the fastening direction of the inner fastener is perpendicular to the direction of pulling the pull rod. This makes the fastening operation simpler and more convenient, and also ensures a more secure and reliable fixation of the base plate. In addition, the structural design of the inner fastener and the snap-fit ​​structure on the base plate ensures that the base plate is firmly and reliably bound to the case shell, thereby increasing the service life of the case's pull rod.

[0017] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the bag / case of this utility model;

[0019] Figure 2 This is a diagram showing the installation status of the upper bracket assembly for the luggage handle of this utility model;

[0020] Figure 3 for Figure 2 Assembly diagram of the inner fastener being horizontally fastened to the base plate;

[0021] Figure 4 This is an exploded view of the mounting structure of the upper bracket assembly for the luggage handle of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the base plate of this utility model;

[0023] Figure 6 This is a perspective view of the internal fastener of this utility model from a top view.

[0024] Figure 7 This is a perspective view of the inner fastener of this utility model from a downward angle;

[0025] Figure 8 This is a schematic diagram of the structure of the internal fastener and seat plate assembled onto the housing of this utility model. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the structure of the internal fastener and seat plate assembled onto the housing of this utility model. Figure 2 . Detailed Implementation

[0027] See appendix Figures 1-9 This utility model discloses a luggage pull rod support assembly, including a seat plate 1 disposed outside the luggage shell 9 and an inner fastener 2 disposed inside the luggage shell 9. The seat plate 1 includes an L-shaped main panel 11, and a recess is formed on the outer side of the main panel 11. This recess is for the handle 31 to be inserted when the pull rod 3 is folded and stored (see attached drawing). Figure 1 A skirt plate 12 extends outward from the edge of the main panel 11. The main panel 11 includes a base plate 111 and upright plates 112 surrounding the left and right sides and the back of the base plate 111. The base plate 111 is provided with a downward protruding sleeve portion 13. A buckle structure that can extend into the inside of the housing 9 is formed on the inner side of the seat plate 1. The inner fastener 2 is fastened to the buckle structure. The buckle structure includes lateral fastening seats 14 located on the left and right sides of the upright plate 112, and lower fastening seats 15 formed on the base plate 111. Both the lateral fastening seats 14 and the lower fastening seats 15 include hook bases 141 and 151 and longitudinal anti-detachment heads 142 and 152. A positioning protrusion 16 is provided on the upright plate 112 near the skirt plate 12, and the positioning protrusion 16 protrudes in the direction of the skirt plate 12's flipping extension. The inner fastener 2 has a longitudinal fastening plate 21 that corresponds to and cooperates with the upright plate 112. The upper edge of the longitudinal fastening plate 21 flips and extends to abut. Support plate 22 and abutment plate 22 correspond to and cooperate with skirt plate 12. The lower edge of longitudinal buckle plate 21 extends and flips to form a bottom end buckle plate 23 that corresponds to and cooperates with bottom plate 111. The left and right ends of longitudinal buckle plate 21 are formed with transverse positioning hooks 24. The bottom end buckle plate 23 is provided with bottom side buckles 25. Both transverse positioning hooks 24 and bottom side buckles 25 include hook arms 241 and 251 protruding in the direction of extension of bottom end buckle plate 23. Hook heads 242 and 252 are provided at the ends of hook arms 241 and 251. The longitudinal buckle plate 21 is provided with positioning recesses 26. Figure 1 As shown, when the inner fastener 2 is fastened onto the seat plate 1, the positions of the upright plate and the longitudinal fastener plate correspond, the position of the support plate 22 corresponds to the position of the skirt plate 12, and the position of the bottom fastener plate 23 corresponds to the position of the bottom plate; as shown Figure 2As shown by the dotted line arrow direction, the inner fastener 2 is fastened to the seat plate 1 along the flipping extension direction of the bottom fastener plate 23, i.e., laterally. The lateral fastening hook 24 is hooked on the hook base 141 of the lateral fastening seat 14, and the hook arm 241 of the lateral fastening hook 24 and the longitudinal anti-detachment head 142 of the lateral fastening seat 14 are longitudinally supported. The bottom fastening hook 25 is hooked on the hook base 141 of the lower fastening seat 15, and the hook arm 241 of the bottom fastening hook 25 and the longitudinal anti-detachment head 152 of the lower fastening seat 15 are longitudinally supported. The positioning protrusion 16 is inserted into the positioning recess 26. The seat plate 1 is assembled onto the housing 9. The seat plate 1 is restricted by the housing 9. In the direction in which the seat plate 1 is detached from the housing 9, such as in the direction in which the inner fastener 2 is fastened to the seat plate 1, the hook head and hook base restrict and prevent detachment. In the longitudinal upward direction, the hook arm and the longitudinal anti-detachment head abut and restrict, and the positioning protrusion 16 protrudes into the positioning recess, which at the same time restricts the seat plate 1 from detaching from the housing 9. The corresponding position arrangement of the buckle structure and the corresponding matching structure of the inner fastener (the lateral buckle seat, the lower buckle seat and the positioning protrusion 16 on the seat plate, and the transverse buckle hook, the bottom buckle hook and the positioning recess on the inner fastener) can realize the reliable connection between the seat plate and the inner fastener plate, forming a reliable restriction point for the seat plate. The shape of the inner fastener 2 (the setting of the upright plate, the support plate and the bottom buckle plate) can reliably abut against the housing, reliably restricting the seat plate to the housing, ensuring that the seat plate is installed firmly and reliably. Furthermore, the fastening direction of the inner fastener onto the seat plate ensures convenient installation while guaranteeing reliable restraint and fixation of the seat plate by the inner fastener. During assembly, the seat plate 1 is pre-installed onto the mounting position of the case shell 9. The snap-fit ​​structure on the seat plate 1 extends to the inside of the case shell 9 through the through hole. Then, the inner fastener is snapped onto the snap-fit ​​structure of the seat plate. The inner fastener is laterally fastened onto the seat plate, meaning that the fastening direction of the inner fastener is perpendicular to the operating direction of pulling the pull rod. This makes the fastening operation of the inner fastener simpler and more convenient, and also ensures a more secure and reliable fixation of the seat plate. In addition, the structural design of the inner fastener and the snap-fit ​​structure on the seat plate ensures that the seat plate is securely and reliably restrained on the case shell, thereby improving the service life of the case's pull rod. This specific embodiment is a double-bar type pull rod 3. Therefore, the base plate 121 has two sleeve parts 13 respectively located on the left and right sides, and the corresponding bottom buckle plate 23 has a clearance position that avoids the sleeve parts; of course, as another common form of luggage, there is also a single-bar type pull rod.

[0028] To further ensure reliable fixation of the inner fastener to the seat plate, the positioning protrusion 16 includes side protrusions 16-1 located at the left and right ends, and a middle protrusion 16-2 located between the two side protrusions 16-1. Correspondingly, the positioning recess 26 includes side recesses 26-1 that are inserted into the two side protrusions 16-1 one-to-one, and a middle recess 26-2 that is inserted into the middle protrusion 16-2. That is, multiple positioning associated positions are formed laterally along the upper edge of the seat plate (where the skirt plate 12 is located), thereby improving the restriction on the seat plate and ensuring that the seat plate is firmly and reliably fixed. Furthermore, different structural forms of the positioning protrusions are adopted. Specifically, the side protrusions 16-1 and the skirt plate 12 are spaced apart to form an insertion interval, and the side recesses 26-1 are recessed cavities with walls 26-11 that are inserted into the insertion interval and abut against the side protrusions 16-1. A wall is formed against the side protrusion, which reliably presses the seat plate against the housing, preventing the seat plate from detaching from the housing. Utilizing the structural design of the side protrusion and side recess, the side protrusion 16-1 is provided with an alternative screw insertion hole 16-12 for screw thread engagement. The side recess 26-1 has a bottom, and a spare through hole 26-12 is provided on the bottom of the side recess 26-1. The spare through hole 26-12 and the alternative screw insertion hole 16-12 are correspondingly engaged. Although the structural design of this utility model can effectively ensure the fixing reliability of the seat plate, in view of customer choices and higher requirements, an auxiliary solution is provided for customers. That is, when the customer deems it necessary, screws can be inserted to achieve the screw fastening effect using the side protrusions and side recesses. Moreover, the above alternative solution will not only not increase the structural complexity or processing cost, but also benefit the injection molding of the side protrusions and side recesses. Specifically, the alternative screw insertion hole design can reduce the rear end of the side protrusion and avoid surface collapse during the molding of the side protrusion. Similarly, the alternative through hole is also beneficial to the injection molding of the side recess.

[0029] In one embodiment of this utility model, the intermediate protrusion 16-2 is integrally formed and connected to the skirt plate 12, and the intermediate protrusion 16-2 has a positioning groove 16-21. The intermediate recess 26-2 includes a through-hole body 26-21 extending to the support plate 22. On the support plate 22, a reinforcing boss 221 is integrally formed and connected to the longitudinal buckle plate 21, protruding downward at the position corresponding to the through-hole body 26-21. A positioning tongue 222 is reserved on the support plate 22 at the thickened part corresponding to the reinforcing boss 221, located in the through-hole body 26-21. Thus, the positioning tongue 222 has a larger thickness, thereby having better strength. When the intermediate protrusion 16-2 is inserted into the through-hole body 26-21, the positioning tongue 222 is inserted into the positioning groove 16-21 and abuts against the intermediate protrusion 16-2. The intermediate protrusion and intermediate recess have a simpler structural design while ensuring reliable fit.

[0030] To improve the structural strength of the lateral snap hook, the abutment plate 22 extends to the hook arm 241 of the lateral snap hook 24. The extended portion of the abutment plate 22 strengthens the lateral snap hook 24, giving it greater structural strength. Therefore, the lateral snap hook is stiffer, ensuring stronger restraint when it engages with the corresponding lateral snap seat 14. However, during assembly, the lateral snap hook 24 and the lateral snap seat 14 need to avoid each other. The lateral snap seat is formed on the base plate 1. The design of deformable displacement has drawbacks, therefore, a displacement avoidance design for the lateral snap hook is more reasonable. To balance avoiding damage to the structural reinforcement advantages of the lateral snap hook and achieving its avoidance capability, the following optimized design is adopted: the support plate 22 has a weakened break 220 that breaks the support plate 22, and the weakened break 220 corresponds to a clearance position on the longitudinal snap plate 21 that avoids the bottom snap plate 23. The elastic deformation of the longitudinal snap plate 21 at the position corresponding to the weakened break 220 constitutes the offset of the lateral snap hook during the process of hooking onto the lateral snap seat. That is, the avoidance capability of the lateral snap hook is achieved through the elastic deformation of the longitudinal snap plate. In addition, the longitudinal snap plate 21 has a thickened wall 212 at the position corresponding to the weakened break 220 to increase the thickness, and the support plate 22 has an edge reinforcing rib 223 integrally formed at the edge of the weakened break 220 and connected to the longitudinal snap plate. This ensures the structural reliability of the corresponding position. With the double-sleeve design, it is easier to design the location of the fracture.

[0031] In another embodiment of this utility model, the bottom side fastening hook 25 is fork-shaped, and the bottom side fastening hook 25 includes hook heads 252 arranged facing each other and elastically deformable hook bodies. At least two bottom side fastening hooks 25 are provided on the bottom fastening plate 23, and the bottom plate 121 is provided with a plurality of lower fastening seats 15 that correspond one-to-one with the plurality of bottom side fastening hooks 25.

[0032] This utility model also discloses a luggage pull rod assembly, including a pull rod assembly and an upper support assembly. The pull rod assembly includes an outer fixing tube 32 and an inner tube that telescopically fits within the outer fixing tube 32. The upper end of the inner tube is provided with a handle. The upper support assembly adopts the above-described structural design, so it will not be described in detail. The outer fixing tube 32 passes through the sleeve portion and is fixed to the sleeve portion 13. The sleeve portion 13 is provided with a side fixing hole 131. A stamped protrusion 321 is formed on the outer fixing tube 32 to fit into the side fixing hole, thus fixing the outer fixing tube to the sleeve portion. That is, the fixing is achieved by stamping the outer fixing tube to form a stamped protrusion, which is simple in structure.

Claims

1. A luggage handle support assembly, comprising a base plate disposed outside the luggage shell, the base plate including an L-shaped main panel, a skirt plate extending outwardly from the edge of the main panel, the main panel including a bottom plate and upright plates surrounding the left and right sides and the back of the bottom plate, the bottom plate having a downwardly protruding sleeve portion, characterized in that: It also includes an inner fastener configured inside the shell. A snap-fit ​​structure that can extend into the shell is formed on the inner side of the base plate. The inner fastener is fastened to the snap-fit ​​structure. The snap-fit ​​structure includes lateral snap-fit ​​seats located on the left and right sides of the upright plate, and a lower snap-fit ​​seat formed on the bottom plate. Both the lateral snap-fit ​​seats and the lower snap-fit ​​seats include a hook base and a longitudinal anti-detachment head. A positioning protrusion is provided on the upright plate near the skirt plate. The positioning protrusion protrudes in the direction of the skirt plate's flipping extension. The inner fastener has a longitudinal fastener plate that corresponds to and mates with the upright plate. A support plate extends from the upper edge of the longitudinal fastener plate, corresponding to and mates with the skirt plate. A bottom fastener plate extends from the lower edge of the longitudinal fastener plate, corresponding to and mates with the bottom plate. Lateral snap hooks are formed at both ends of the longitudinal fastener plate. A bottom-side snap hook is provided on the bottom-side snapener plate. Both the lateral snap hooks and the bottom-side snap hooks include hook arms protruding towards the direction of extension of the bottom-side snapener plate, with hook heads at the ends of the hook arms. A positioning recess is provided on the longitudinal fastener plate. The inner fastener is fastened to the base plate along the flipping extension direction of the bottom fastener plate. The lateral fastening hook is hooked on the hook base of the lateral fastening seat, and the hook arm of the lateral fastening hook and the longitudinal anti-disengagement head of the lateral fastening seat are longitudinally supported. The bottom fastening hook is hooked on the hook base of the lower fastening seat, and the hook arm of the bottom fastening hook and the longitudinal anti-disengagement head of the lower fastening seat are longitudinally supported. The positioning protrusion is inserted into the positioning recess.

2. The luggage handle support assembly according to claim 1, characterized in that: The positioning protrusion includes side protrusions located at the left and right ends, and a middle protrusion located between the two side protrusions. Correspondingly, the positioning recess includes side recesses that are inserted into the two side protrusions one by one, and a middle recess that is inserted into the middle protrusion.

3. The luggage handle support assembly according to claim 2, characterized in that: The side protrusion and the skirt plate form an insertion interval, and the side concave part is a recessed cavity with a wall that is inserted into the insertion interval and abuts against the side protrusion.

4. The luggage handle support assembly according to claim 3, characterized in that: The side protrusion is provided with an alternative screw insertion hole for screw thread connection, and the side concave part has a bottom. The bottom of the side concave part is provided with a spare through hole, and the spare through hole and the alternative screw insertion hole are correspondingly matched.

5. The luggage pull rod upper bracket assembly according to claim 2, 3, or 4, characterized in that: The central protrusion is integrally formed and connected to the skirt plate, and the central protrusion has a positioning groove. The central recess includes a through hole body extending to the support plate. On the support plate, a stiffening boss is integrally formed and connected to the longitudinal buckle plate at the position corresponding to the through hole body. On the support plate, a positioning tongue is reserved in the through hole body at the thickened part corresponding to the stiffening boss. When the central protrusion is inserted into the through hole body, the positioning tongue is inserted into the positioning groove and abuts against the central protrusion.

6. The luggage pull rod upper bracket assembly according to claim 1, characterized in that: The abutment plate extends to the hook arm of the transverse snap hook. The abutment plate has a weakened break that breaks the abutment plate. The weakened break corresponds to a clearance position on the longitudinal snap plate that avoids the bottom snap plate. The longitudinal snap plate at the corresponding weakened break position undergoes elastic deformation, which causes the transverse snap hook to shift during the process of hooking onto the lateral snap seat.

7. The luggage pull rod upper bracket assembly according to claim 6, characterized in that: The longitudinal buckle plate has a thickened wall at the corresponding weakened fracture position to increase its thickness, and the abutment plate is integrally formed at the edge of the weakened fracture and connected to the edge reinforcing rib of the longitudinal buckle plate.

8. The luggage pull rod upper bracket assembly according to claim 1, characterized in that: The bottom side fastening hook is fork-shaped and includes a hook body with hook heads facing each other and elastically deformable. At least two bottom side fastening hooks are provided on the bottom fastening plate, and the bottom plate is provided with a number of lower fastening seats that correspond one-to-one with the number of bottom side fastening hooks.

9. The luggage pull rod upper bracket assembly according to claim 1 or 6, characterized in that: The base plate has two sleeve sections located on the left and right sides respectively, and the corresponding bottom end buckle plate has a clearance position that avoids the sleeve section.

10. A luggage pull rod assembly, comprising a pull rod assembly and an upper bracket assembly, the pull rod assembly including an outer fixing tube and an inner tube telescopically fitted within the outer fixing tube, the upper end of the inner tube being provided with a handle, the outer fixing tube passing through a sleeve portion and fixed to the sleeve portion, characterized in that: The upper support assembly is the upper support assembly described in any one of claims 1 to 9 above. The sleeve portion is provided with a side fixing hole, and the outer fixing tube is stamped to form a punched protrusion that engages with the side fixing hole to fix the outer fixing tube to the sleeve portion.

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