Pull rod assembly for flat-lying conversion type luggage case

Abstract

The utility model relates to a pull rod assembly for a flat-lying conversion type luggage case, which comprises a telescopic pull rod, a pull rod seat fixed on the pull rod and a lock seat fixed on a case body, a spring bolt capable of reciprocating is arranged in the lock seat, and the pull rod seat is provided with an adaptive lock hole; the lock tongue is in linkage with a shifting buckle, the shifting buckle is used for driving the lock tongue to reciprocate towards the pull rod base, and when the lock tongue is inserted into the lock hole, the pull rod base is fixed to the lock base. When the lock tongue is separated from the lock hole, the pull rod seat is separated from the lock seat. The lock tongue is directly driven to move through the shifting buckle, the number of parts and machining complexity are reduced, flexible switching of the luggage case among different states is achieved, production efficiency is improved, cost is reduced, and using convenience is improved.

Description

Technical Field

[0001] The utility model particularly relates to a pull rod assembly for a flat-lying conversion type luggage case. Background Art

[0002] The Chinese utility model patent document with the publication number "CN222217346U" discloses a flat-lay convertible suitcase, which mainly includes a case, a pull rod mechanism, and casters. The pull rod mechanism consists of a pull rod and a pull rod seat. The lower end of the pull rod is rotatably connected to the case, and a lock seat fixed to the case is provided between the pull rod and the case. A retractable lock tongue is provided in the lock seat, and the lock tongue is linked to an unlocking mechanism, and a keyhole adapted to the lock tongue is provided on the pull rod seat.

[0003] The unlocking mechanism is mainly composed of a lock tongue, an unlocking block, a dial buckle and a spring. The lock tongue is installed in the lock seat, can be retracted and cooperated with the keyhole on the pull rod seat to realize the locking or unlocking function; the unlocking block is connected to the lock tongue through a transmission shaft, and an inclined strip groove is provided on it, which is used to convert the lateral movement of the unlocking block into the telescopic action of the lock tongue; the dial buckle is connected to the unlocking block by screws, and the surface is provided with anti-slip grooves and convex strips, which is convenient for users to operate the unlocking block to move.

[0004] The pull rod mechanism has the following technical problems: the locking and unlocking between the pull rod mechanism and the box body mainly rely on the unlocking mechanism, and the unlocking structure is composed of multiple parts, and an inclined strip groove needs to be processed to convert the lateral movement of the unlocking block into the telescopic movement of the lock tongue. The structure is complex, the processing process is relatively complex, and the assembly is cumbersome, which directly leads to reduced production efficiency and increased production costs. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a pull rod assembly for a flat-laying convertible suitcase in view of the deficiencies of the above-mentioned prior art, which directly drives the lock tongue to move by a buckle, reduces the number of parts and the complexity of processing, realizes the flexible switching of the suitcase between different states, improves production efficiency and reduces costs.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pull rod assembly for a flat-lying convertible suitcase, comprising a retractable and slidable pull rod, a pull rod seat fixed on the pull rod, and a lock seat fixed on the suitcase body, wherein a locking tongue which can reciprocate toward the pull rod seat is arranged in the lock seat, and a keyhole which matches the locking tongue is arranged on the pull rod seat, and the characteristic is that: the locking tongue is linked with a pull buckle, and the pull buckle is used to drive the locking tongue to reciprocate toward the pull rod seat, when the locking tongue is inserted into the keyhole, the pull rod seat is fixed on the lock seat; when the locking tongue is separated from the keyhole, the pull rod seat is separated from the lock seat.

[0007] By adopting the above technical solution, the lock tongue is directly driven to move by the buckle, the structure is simpler, the number of parts is reduced, the difficulty of processing and assembly is reduced, and the problem of the complex structure of the original unlocking mechanism is effectively solved. There is no need to process the inclined strip groove, which reduces the complexity of the processing technology and makes the assembly process simpler, thereby improving production efficiency and reducing production costs. During installation, the lock seat is fixed on the box body, and the pull rod seat is fixed on the pull rod, and the lower end of the pull rod is rotatably connected to the box body or the suitcase caster seat. Through the lock tongue on the lock seat and the keyhole on the pull rod seat for plugging and separation, the user can unlock the pull rod by toggling the buckle when needed, and drive the pull rod to rotate around the rotating connection between the lower end and the box body, thereby realizing the flexible switching of the suitcase between different states (vertical and horizontal) to meet the use requirements in different scenarios.

[0008] The above-mentioned tie rod assembly for the flat-lay convertible suitcase can be further configured as follows: the end of the locking tongue away from the tie rod seat is linked to a spring, the locking seat is provided with a guide column corresponding to the spring, the locking tongue is provided with a guide hole corresponding to the spring, one end of the spring is sleeved on the guide column, and the other end is inserted into the guide hole.

[0009] With the above technical solution, the main function of the spring is to provide a stable reset force for the lock tongue. When the lock tongue is withdrawn from the keyhole by hand through the buckle, the spring will automatically reset the lock tongue to its initial position after the hand releases the buckle, which is convenient for use. The guide column and the guide hole support and guide the two ends of the spring respectively to ensure that the spring moves axially during the extension and contraction process, avoiding deflection or twisting of the spring during movement. Secondly, the spring can improve the working stability of the lock tongue, and no shaking will occur regardless of whether the lock tongue is moving or not moving.

[0010] The above-mentioned pull rod assembly for a flat-lying convertible suitcase can be further configured as follows: a connecting shaft is provided between the pull buckle and the lock tongue, the lock seat is provided with a strip hole corresponding to the connecting shaft, the strip hole is arranged parallel to the moving direction of the lock tongue, one end of the connecting shaft is fixedly connected to the pull buckle, the lock tongue is provided with a connecting hole, and the other end of the connecting shaft passes through the strip hole and is inserted into the connecting hole.

[0011] With the above technical solution, the connecting shaft is a direct connecting component between the button and the lock tongue. It is fixedly connected to the button at one end and inserted into the connecting hole on the lock tongue at the other end, so as to transmit the movement of the button to the lock tongue, thereby realizing the reciprocating movement of the lock tongue. The strip hole guides the movement of the button and the lock tongue through the connecting shaft, and at the same time limits the extreme movement position of the lock tongue to avoid excessive displacement of the lock tongue.

[0012] The above-mentioned pull rod assembly for a lie-flat convertible suitcase can be further configured as follows: the surface of the buckle is provided with anti-slip grooves, and the middle of the buckle is provided with a convex strip.

[0013] By adopting the above technical solution, the anti-skid pattern on the surface of the buckle and the convex strip in the middle both increase the friction force, making it easier for people to push the buckle.

[0014] The above-mentioned pull rod assembly for a flat-lying convertible suitcase can be further configured as follows: the lock tongue includes a linkage body and a plurality of groups of lock tongue blocks sequentially arranged on the same side of the linkage body, the linkage body is linked with the buckle, the lock seat is provided with a lock tongue hole corresponding to the keyhole and slidingly matched with the lock tongue block, and the linkage body is provided with a plurality of groups of weight-reducing grooves.

[0015] With the above technical solution, the bolt hole is used to prevent the bolt from interfering with the lock seat when it moves toward the keyhole. The weight-reducing groove is used to reduce the weight of the lock seat.

[0016] The above-mentioned tie rod assembly for a lie-flat convertible suitcase may be further configured as follows: the lock seat is provided with a slot on a side facing the tie rod seat, and the tie rod seat is provided with a hook adapted to the slot.

[0017] By adopting the above technical solution, when the rod seat is restricted on the box body, in addition to the lock tongue and the lock eye cooperating, the hook and the slot also cooperate to enhance the connection strength between the rod seat and the box body.

[0018] The above-mentioned tie rod assembly for a flat convertible suitcase can be further configured as follows: the lock seat includes an upper cover plate and a lower cover plate that are relatively distributed, the upper cover plate is provided with a plurality of groups of connecting columns, the lower cover plate is provided with a group of matching positioning holes corresponding to each group of connecting columns, the connecting columns are provided with internal threaded holes, and the connecting columns are connected to fasteners through the internal threaded holes.

[0019] By adopting the above technical solution, the lock seat is designed as a detachably connected upper cover plate and lower cover plate, which is convenient for assembling and replacing parts such as the lock tongue, spring, buckle, connecting shaft, etc. Among them, the fasteners can be standard parts such as screws or pins, and the fasteners can fix the upper cover plate and the lower cover plate through the connecting column and the positioning hole.

[0020] The above-mentioned pull rod assembly for a flat convertible suitcase can be further configured as follows: a rotating sleeve is provided at the lower end of the pull rod, a rotating shaft is provided inside the rotating sleeve, rotating seats fixed to the suitcase body are symmetrically provided at both ends of the rotating sleeve, a plug-in hole is provided on the side of the rotating seat facing the rotating sleeve, and the end of the rotating shaft extends toward the rotating seat until it is inserted into the plug-in hole.

[0021] By adopting the above technical solution, when the lock tongue exits the keyhole, the pull rod seat is no longer restricted, and when a person manually pulls or pushes the pull rod to rotate, the rotating sleeve and the rotating shaft will rotate around the rotating seat to realize the rotation of the pull rod.

[0022] The above-mentioned tie rod assembly for a flat convertible suitcase can be further configured as follows: a plurality of groups of protrusions surrounding the outer circumference of the plug-in hole and arranged at intervals are arranged on the side of the rotating seat, and a groove corresponding to the protrusion is arranged at the end of the rotating sleeve, and the outer surface of the protrusion is a curved surface.

[0023] With the above technical solution, a person manually applies a certain push or pull force to the pull rod until the protrusion separates from the groove. When the pull rod rotates to the desired angle, the protrusion will cooperate with a set of grooves to keep the pull rod fixed at that angle. Therefore, the pull rod can be kept fixed at any rotation angle, improving the flexibility of the luggage case. The surface of the protrusion is curved, which facilitates the separation and cooperation of the protrusion and the groove.

[0024] The above-mentioned tie rod assembly for a lie-flat convertible suitcase can be further configured as follows: the tie rod includes an outer tube and an inner tube, the lower end of the outer tube is linked to a rotating sleeve, connecting sleeves are symmetrically provided at both ends of the tie rod seat, the outer periphery of the connecting sleeve is provided with a barb, the upper end of the outer tube is provided with a bayonet matched with the barb, the connecting sleeve is inserted into the outer tube until the barb and the bayonet are matched, a through hole penetrating the connecting sleeve is provided in the tie rod seat, the inner tube is inserted into the outer tube through the through hole and slidably matched with the outer tube, and a tie rod handle is provided at the upper end of the inner tube.

[0025] By adopting the above technical solution, the barb cooperates with the bayonet to realize the fixed connection between the rod seat and the outer tube. Through holes penetrating the connecting sleeve are symmetrically arranged at both ends of the rod seat, and the upper end of the outer tube is inserted into the through hole of the rod seat, ensuring the smoothness of the rod during the extension and retraction process.

[0026] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0028] Figure 2 This is an exploded schematic diagram of the lower end of the pull rod of an embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of an explosion above the pull rod of an embodiment of the utility model;

[0030] Figure 4 A schematic diagram of a lower cover plate of an embodiment of the utility model;

[0031] Figure 5 A schematic diagram of an upper cover plate of an embodiment of the utility model;

[0032] Figure 6 It is a schematic diagram of the explosion of the lock tongue and the buckle of the embodiment of the utility model.

[0033] Reference numerals: pull rod 1, rotating sleeve 1a, rotating shaft 1b, rotating seat 1c, plug-in hole 1d, protrusion 1e, groove 1f, outer tube 1g, inner tube 1h, bayonet 1j; pull rod seat 2, keyhole 2a, hook 2b, connecting sleeve 2c, barb 2d; lock seat 3, strip hole 3a, guide column 3b, lock tongue hole 3c, slot 3d, upper cover plate 3e, lower cover plate 3f, connecting column 3g, positioning hole 3h; lock tongue 4, connecting hole 4a, guide hole 4b, linkage body 4c, lock tongue block 4d, weight-reducing groove 4e; buckle 5, anti-slip pattern 5a, protrusion 5b; connecting shaft 6, spring 7. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] like Figures 1 to 6 The pull rod assembly for a flat convertible luggage case shown in the figure comprises a pull rod 1 that can be telescopically slid, a pull rod seat 2 fixed on the pull rod 1, and a lock seat 3 fixed on the luggage case body. A lock tongue 4 that can reciprocate toward the pull rod seat 2 is arranged in the lock seat 3. A lock hole 2a that matches the lock tongue 4 is arranged on the pull rod seat 2. The lock tongue 4 is linked with a toggle 5. A connecting shaft 6 is arranged between the toggle 5 and the lock tongue 4. The lock seat 3 is provided with a strip hole 3a corresponding to the connecting shaft 6. The strip hole 3a is arranged parallel to the moving direction of the lock tongue 4. One end of the connecting shaft 6 is fixedly connected to the toggle 5. The lock tongue 4 is provided with a connecting hole 4a. The other end of the connecting shaft 6 passes through the strip hole 3a and is inserted into the connecting hole 4a. The connecting shaft 6 is a direct connecting component between the toggle 5 and the lock tongue 4. It is fixedly connected to the toggle 5 at one end and inserted into the connecting hole 4a on the lock tongue 4 at the other end, so as to transmit the movement of the toggle 5 to the lock tongue 4, thereby realizing the reciprocating movement of the lock tongue 4. The strip hole 3 a guides the movement of the pull button 5 and the lock tongue 4 through the connecting shaft 6 , and at the same time limits the extreme movement position of the lock tongue 4 to prevent the lock tongue 4 from being excessively displaced.

[0036] The end of the lock tongue 4 away from the pull rod seat 2 is linked with a spring 7, the lock seat 3 is provided with a guide column 3b corresponding to the spring 7, and the lock tongue 4 is provided with a guide hole 4b corresponding to the spring 7, one end of the spring 7 is sleeved on the guide column 3b, and the other end is inserted into the guide hole 4b. The main function of the spring 7 is to provide a stable reset force for the lock tongue 4. When the lock tongue 4 is withdrawn from the keyhole 2a by the hand through the buckle 5, the spring 7 will automatically reset the lock tongue 4 to the initial position after the hand releases the buckle 5, which is convenient for use. The guide column 3b and the guide hole 4b support and guide the two ends of the spring 7 respectively, ensuring that the spring 7 moves axially during the extension and contraction process, and avoiding the spring 7 from being deflected or twisted during the movement. Secondly, the spring 7 can improve the working stability of the lock tongue 4, and no shaking will occur regardless of whether the lock tongue 4 is moving or not moving.

[0037] The surface of the button 5 is provided with anti-skid patterns 5a, and a convex strip 5b is provided in the middle of the button 5. The anti-skid patterns 5a on the surface of the button 5 and the convex strip 5b in the middle both increase the friction force, making it convenient for a person to push the button 5.

[0038] The lock tongue 4 includes a linkage body 4c and a plurality of lock tongue blocks 4d sequentially arranged on the same side of the linkage body 4c. The linkage body 4c is linked with the pull button 5. The lock seat 3 is provided with a lock tongue hole 3c corresponding to the keyhole 2a and slidingly matched with the lock tongue block 4d. The linkage body 4c is provided with a plurality of weight-reducing grooves 4e. The lock tongue hole 3c is used to prevent the lock tongue 4 from interfering with the lock seat 3 during the movement toward the keyhole 2a. The weight-reducing groove 4e is used to reduce the weight of the lock seat 3.

[0039] The lock base 3 is provided with a slot 3d on one side facing the rod base 2, and the rod base 2 is provided with a hook 2b adapted to the slot 3d. When the rod base 2 is restricted on the box, in addition to the lock tongue 4 cooperating with the keyhole 2a, the hook 2b also cooperates with the slot 3d, thereby enhancing the connection strength between the rod base 2 and the box.

[0040] The lock base 3 includes an upper cover plate 3e and a lower cover plate 3f which are relatively distributed. The upper cover plate 3e is provided with a plurality of groups of connecting columns 3g. The lower cover plate 3f is provided with a group of matching positioning holes 3h corresponding to each group of connecting columns 3g. The connecting columns 3g are provided with internal threaded holes, and the connecting columns 3g are connected with fasteners through the internal threaded holes. The lock base 3 is designed as a detachably connected upper cover plate 3e and lower cover plate 3f, which is convenient for the assembly and replacement of parts such as the lock tongue 4, the spring 7, the buckle 5, and the connecting shaft 6. Among them, the fasteners can be standard parts such as screws or pins, and the fasteners are used to fix the upper cover plate 3e and the lower cover plate 3f through the connecting columns 3g and the positioning holes 3h.

[0041] The lower end of the pull rod 1 is provided with a rotating sleeve 1a, and a rotating shaft 1b is provided inside the rotating sleeve 1a. The rotating sleeve 1a is symmetrically provided with rotating seats 1c fixed to the luggage box body at both ends. The rotating seat 1c is provided with a plug hole 1d on the side facing the rotating sleeve 1a, and the end of the rotating shaft 1b extends toward the rotating seat 1c until it is inserted into the plug hole 1d. When the lock tongue 4 exits the keyhole 2a, the pull rod seat 2 is no longer restricted. When the pull rod 1 is manually pulled or pushed to rotate, the rotating sleeve 1a and the rotating shaft 1b will rotate around the rotating seat 1c to realize the rotation of the pull rod 1.

[0042] The side of the rotating seat 1c is provided with a plurality of groups of protrusions 1e that surround the outer periphery of the plug-in hole 1d and are arranged at intervals. The end of the rotating sleeve 1a is provided with a groove 1f corresponding to the protrusion 1e, and the outer surface of the protrusion 1e is a curved surface. A person manually applies a certain thrust or pull force to the pull rod 1 until the protrusion 1e is separated from the groove 1f. When the pull rod 1 is rotated to the required angle, the protrusion 1e will cooperate with a group of grooves 1f to achieve that the pull rod 1 remains fixed at this angle. Therefore, the pull rod 1 can remain fixed at any rotation angle, improving the flexibility of the suitcase. The surface of the protrusion 1e is a curved surface, which facilitates the separation and cooperation of the protrusion 1e and the groove 1f.

[0043] The pull rod 1 includes an outer tube 1g and an inner tube 1h. The lower end of the outer tube 1g is linked with the rotating sleeve 1a. The two ends of the pull rod seat 2 are symmetrically provided with connecting sleeves 2c. The outer periphery of the connecting sleeve 2c is provided with a hook 2d. The upper end of the outer tube 1g is provided with a bayonet 1j adapted to the hook 2d. The connecting sleeve 2c is inserted into the outer tube 1g until the hook 2d is matched with the bayonet 1j. A through hole penetrating the connecting sleeve 2c is provided in the pull rod seat 2. The inner tube 1h is inserted into the outer tube 1g through the through hole and slidably matched with the outer tube 1g. The upper end of the inner tube 1h is provided with a pull rod 1 handle. The hook 2d is matched with the bayonet 1j to realize the fixed connection between the pull rod seat 2 and the outer tube 1g. The two ends of the pull rod seat 2 are symmetrically provided with through holes penetrating the connecting sleeve 2c. The upper end of the outer tube 1g is inserted into the through hole of the pull rod seat 2, ensuring the smoothness of the pull rod 1 during the telescopic process.

[0044] The operation method of this embodiment is as follows:

[0045] When the pull rod assembly is installed on the luggage box body, the lower end of the pull rod 1 is rotatably connected to the rotating sleeve 1a fixed on the luggage box body through the sleeve.

[0046] When the suitcase needs to be used horizontally, the button 5 is pushed downward, and the button 5 drives the lock tongue 4 to move through the connecting shaft 6 until the lock tongue block 4d on the lock tongue 4 exits the keyhole 2a on the pull rod seat 2, and then the pull rod 1 is rotated. Due to the cooperation between the groove 1f and the protrusion 1e, it can ensure that the pull rod 1 stays at any angle.

[0047] When the suitcase needs to be used upright, the pull rod 1 is rotated to the surface of the suitcase body until the lock tongue 4 is inserted into the keyhole 2a, so that the pull rod base 2 and the lock base 3 are fixedly connected, that is, the pull rod 1 is fixed to the body.

Claims

1. A pull rod assembly for a flat convertible luggage case, comprising a retractable and slidable pull rod, a pull rod seat fixed on the pull rod, and a lock seat fixed on a luggage case body, wherein a lock tongue that can reciprocate toward the pull rod seat is arranged in the lock seat, and a keyhole that matches the lock tongue is arranged on the pull rod seat, and the characteristics are: The lock tongue is linked with a push button, and the push button is used to drive the lock tongue to move back and forth toward the pull rod seat. When the lock tongue is inserted into the keyhole, the pull rod seat is fixed on the lock seat; when the lock tongue is separated from the keyhole, the pull rod seat is separated from the lock seat.

2. The tie rod assembly for a flat-lay convertible luggage case according to claim 1, characterized in that: The end of the locking tongue away from the pull rod seat is linked with a spring, the locking seat is provided with a guide column corresponding to the spring, the locking tongue is provided with a guide hole corresponding to the spring, one end of the spring is sleeved on the guide column, and the other end is inserted into the guide hole.

3. The tie rod assembly for a flat-lay convertible luggage case according to claim 1, characterized in that: A connecting shaft is provided between the pull buckle and the lock tongue, and the lock seat is provided with a strip hole corresponding to the connecting shaft, and the strip hole is arranged parallel to the moving direction of the lock tongue. One end of the connecting shaft is fixedly connected to the pull buckle, and a connecting hole is provided on the lock tongue. The other end of the connecting shaft passes through the strip hole and is inserted into the connecting hole.

4. The tie rod assembly for a flat-lay convertible luggage case according to claim 3, characterized in that: The surface of the buckle is provided with anti-skid patterns, and the middle of the buckle is provided with convex strips.

5. The tie rod assembly for a flat-lay convertible luggage case according to any one of claims 1 to 4, characterized in that: The lock tongue includes a linkage body and several groups of lock tongue blocks arranged in sequence on the same side of the linkage body. The linkage body is linked with the buckle. The lock seat is provided with a lock tongue hole corresponding to the keyhole and slidingly matched with the lock tongue block. The linkage body is provided with several groups of weight reduction grooves.

6. The tie rod assembly for a lie-flat convertible luggage case according to any one of claims 1 to 4, characterized in that: The lock seat is provided with a card slot on one side facing the pull rod seat, and the pull rod seat is provided with a card hook adapted to the card slot.

7. The tie rod assembly for a flat-lay convertible luggage case according to claim 6, characterized in that: The lock seat includes an upper cover plate and a lower cover plate which are relatively distributed. The upper cover plate is provided with a plurality of groups of connecting columns. The lower cover plate is provided with a group of matching positioning holes corresponding to each group of connecting columns. The connecting columns are provided with internal threaded holes, and the connecting columns are connected with fasteners through the internal threaded holes.

8. The tie rod assembly for a lie-flat convertible luggage case according to any one of claims 1 to 4, characterized in that: A rotating sleeve is provided at the lower end of the pull rod, a rotating shaft is provided inside the rotating sleeve, rotating seats fixed on the suitcase body are symmetrically provided at both ends of the rotating sleeve, a plug-in hole is provided on the side of the rotating seat facing the rotating sleeve, and the end of the rotating shaft extends toward the rotating seat until it is inserted into the plug-in hole.

9. The tie rod assembly for a lie-flat convertible luggage case according to claim 8, characterized in that: The side surface of the rotating seat is provided with a plurality of groups of protrusions which surround the outer periphery of the plug-in hole and are arranged at intervals. The end of the rotating sleeve is provided with grooves corresponding to the protrusions. The outer surface of the protrusion is a curved surface.

10. The tie rod assembly for a flat-lay convertible luggage case according to claim 8, characterized in that: The pull rod includes an outer tube and an inner tube. The lower end of the outer tube is linked to a rotating sleeve. Connecting sleeves are symmetrically arranged at both ends of the pull rod seat. Barbs are arranged on the outer periphery of the connecting sleeves. A bayonet matched with the barb is arranged at the upper end of the outer tube. The connecting sleeve is inserted into the outer tube until the barb matches with the bayonet. A through hole penetrating the connecting sleeve is arranged in the pull rod seat. The inner tube is inserted into the outer tube through the through hole and slidably matched with the outer tube. A pull rod handle is arranged at the upper end of the inner tube.

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