Adjustable rear wheel expansion device

Abstract

The utility model relates to the technical field of mobile vehicles, and particularly discloses an adjustable rear wheel expansion device which comprises a device body. A front case; a rear housing; the connecting assembly is arranged between the front shell and the rear shell, one end of the connecting assembly is slidably connected with the front shell in the front-back direction, and the other end of the connecting assembly is fixedly connected with the rear shell; the first rear wheel assembly and the second rear wheel assembly are arranged on the two opposite sides of the rear shell respectively; the expansion assembly can apply a first acting force to the first rear wheel assembly and the second rear wheel assembly, the first acting force enables the first rear wheel assembly and the second rear wheel assembly to move oppositely, and the expansion assembly can apply a second acting force to the first rear wheel assembly and the second rear wheel assembly; the second acting force enables the first rear wheel assembly and the second rear wheel assembly to move relatively. According to the adjustable rear wheel expansion device, the distance between the rear wheels is adjusted, and the performance of the device in the aspects of the stability and the bearing capacity of the rear wheels is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mobile traffic tool technical field especially is related to adjustable rear wheel extension device. BACKGROUND

[0002] In the current market, electric scooters and ride boxes generally adopt fixed wheelbase design. However, when driving at high speed, turning, bearing heavy load or encountering complex road conditions, this design often exposes several problems: first, due to the narrow wheelbase, the vehicle is unstable when driving at high speed or sharp turning, and is prone to rollover or loss of balance; second, the fixed wheelbase design has limitations in weight distribution, resulting in limited carrying capacity; third, this design has low adaptability and cannot meet the needs of different users (such as high speed, low speed, carrying or daily commuting) to adjust the wheelbase to optimize the riding experience; finally, the foldable design on the market often sacrifices stability while improving portability, and the wide wheelbase scooter is inconvenient to carry due to its increased size.

[0003] Therefore, how to solve the problem of limited stability and carrying capacity of the rear wheel due to the fixed spacing has become a technical problem urgently needed to be solved by the technical personnel in the field. SUMMARY

[0004] In view of this, the utility model proposes a adjustable rear wheel extension device to solve the problem of limited stability and carrying capacity of the rear wheel due to the fixed spacing.

[0005] The utility model provides a adjustable rear wheel extension device, which comprises:

[0006] A device body;

[0007] A front shell located on the front side of the device body;

[0008] A rear shell located on the rear side of the device body;

[0009] A connecting assembly arranged between the front shell and the rear shell, one end of the connecting assembly being slidingly connected with the front shell in the front-rear direction, and the other end of the connecting assembly being fixedly connected with the rear shell;

[0010] A first rear wheel assembly and a second rear wheel assembly, the opposite sides of the rear shell being respectively provided with the first rear wheel assembly and the second rear wheel assembly;

[0011] An expansion assembly is configured to apply a first force to the first and second rear wheel assemblies, the first force causing the first and second rear wheel assemblies to move away from each other, and the expansion assembly is configured to apply a second force to the first and second rear wheel assemblies, the second force causing the first and second rear wheel assemblies to move towards each other.

[0012] Further, the front shell comprises:

[0013] A first shell and a second shell are detachably connected;

[0014] The first shell is provided with a plurality of first cavities on a side facing the second shell, and the second shell is provided with a plurality of second cavities on a side facing the first shell, the first cavities and the second cavities cooperating to form a first accommodating cavity, and the first shell and the second shell form a second accommodating cavity, the second accommodating cavity being arranged away from the first accommodating cavity.

[0015] Further, the connecting assembly comprises:

[0016] A connecting rod is arranged between the front shell and the rear shell, one end of the connecting rod being slidably connected to the front shell in the front-rear direction, and the other end of the connecting rod being fixedly connected to the rear shell.

[0017] A plurality of connecting sleeves are sleeved on the connecting rod and are slidably connected to the connecting rod, and the connecting sleeves are clamped with the corresponding first accommodating cavities.

[0018] Further, the first rear wheel assembly comprises a first rear wheel, and the second rear wheel assembly comprises a second rear wheel.

[0019] Further, the expansion assembly comprises:

[0020] A first adjusting plate, one end of the first adjusting plate being slidably connected to the rear shell in the axial direction of the first rear wheel, the other end of the first adjusting plate being rotatably connected to the first rear wheel, and one side of the first adjusting plate being provided with a first rack;

[0021] A second adjusting plate, one end of the second adjusting plate being slidably connected to the rear shell in the axial direction of the second rear wheel, the other end of the second adjusting plate being rotatably connected to the second rear wheel, and one side of the second adjusting plate being provided with a second rack;

[0022] An adjusting rod, the adjusting rod being provided with a transmission gear, and the transmission gear being engaged with the first rack and the second rack on both sides.

[0023] Further, the expansion assembly comprises:

[0024] A third shell is fixed in the second accommodating cavity, and one end of the adjusting rod is arranged in the third shell and is in sliding fit with the third shell in the front-rear direction;

[0025] An electric motor is arranged in the interior of the third shell, and the electric motor is connected with the adjusting rod.

[0026] Further, the adjustable rear wheel expansion device further comprises a limiting assembly, the limiting assembly comprises a first limiting slot and a second limiting slot arranged on opposite sides of the rear shell respectively, a first limiting rod arranged on the first adjusting plate, and a second limiting rod arranged on the second adjusting plate, the first limiting rod is in sliding fit with the first limiting slot in the axial direction of the first rear wheel, and the second limiting rod is in sliding fit with the second limiting slot in the axial direction of the second rear wheel.

[0027] The lengths of the first limiting slot and the second limiting slot are smaller than the length of the rear shell in the axial direction of the first rear wheel.

[0028] Further, one end of the adjusting rod is provided with external threads, and the other end of the adjusting rod is rotationally connected with the rear shell.

[0029] The limiting assembly further comprises a third limiting rod and a limiting sleeve, the third limiting rod is arranged on the adjusting rod and is arranged close to the other end of the adjusting rod and extends outward along the radial direction of the adjusting rod, the limiting sleeve is arranged on the rear shell and is rotationally connected with the rear shell, the limiting sleeve is sleeved on the adjusting rod, a third limiting slot matched with the third limiting rod is arranged on the limiting sleeve, and the third limiting slot is helically arranged along the axial direction of the limiting sleeve.

[0030] Further, the adjustable rear wheel expansion device further comprises a first bearing arranged between the limiting sleeve and the rear shell, and a second bearing arranged between the other end of the adjusting rod and the rear shell.

[0031] Compared with the prior art, the adjustable rear wheel expansion device provided by the utility model has the beneficial effects that the adjustable rear wheel expansion device realizes the adjustability of the distance between the rear wheels through the expansion assembly, so that the first rear wheel assembly and the second rear wheel assembly can move away from each other or move towards each other according to actual requirements, thereby adjusting the distance between the two wheels. This not only improves the performance of the device in terms of rear wheel stability and carrying capacity, but also greatly enhances the ability to adapt to different road conditions and load conditions. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a whole structure schematic view of the adjustable rear wheel expansion device of the utility model;

[0033] Figure 2 This is a schematic diagram of the adjustable rear wheel extension device of this utility model, omitting the first housing and connecting sleeve.

[0034] Figure 3 This is a schematic diagram of the adjustable rear wheel extension device of this utility model, omitting the front and rear shells;

[0035] Figure 4 This is a schematic diagram of the rear wheel assembly and extension assembly of the adjustable rear wheel extension device of this utility model;

[0036] Figure 5 This is a schematic diagram of the adjusting rod and transmission gear of the adjustable rear wheel extension device of this utility model;

[0037] Figure 6 This is a schematic diagram of the adjusting rod of the adjustable rear wheel extension device of this utility model.

[0038] In the diagram: 100, Device body; 110, Front shell; 111, First shell; 112, Second shell; 114, Second cavity; 115, Third shell; 120, Rear shell; 122, Second limiting groove; 131, Connecting rod; 132, Connecting sleeve; 141, First rear wheel; 142, First adjusting plate; 143, Second rear wheel; 144, Second adjusting plate; 145, First rack; 146, Second rack; 151, Adjusting rod; 152, Third limiting rod; 153, Limiting sleeve; 154, Third limiting groove; 155, First bearing; 156, Gear; 157, Second bearing; 161, First limiting rod; 162, Second limiting rod. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] See Figures 1-6 As shown, this embodiment provides an adjustable rear wheel extension device, including: a device body 100; a front shell 110 located at the front of the device body 100; a rear shell 120 located at the rear of the device body 100; a connecting component disposed between the front shell 110 and the rear shell 120, one end of the connecting component being slidably connected to the front shell 110 in the front-rear direction, and the other end of the connecting component being fixedly connected to the rear shell 120; a first rear wheel assembly and a second rear wheel assembly, the first rear wheel assembly and the second rear wheel assembly being respectively provided on opposite sides of the rear shell 120; and an extension component, the extension component being able to apply a first force to the first rear wheel assembly and the second rear wheel assembly, the first force causing the first rear wheel assembly and the second rear wheel assembly to move in opposite directions, and the extension component being able to apply a second force to the first rear wheel assembly and the second rear wheel assembly, the second force causing the first rear wheel assembly and the second rear wheel assembly to move relative to each other.

[0044] It is understood that the adjustable rear wheel extension device provided in this embodiment achieves adjustable rear wheel spacing through the extension components, enabling the first and second rear wheel assemblies to move in opposite directions or relative to each other according to actual needs, thereby adjusting the spacing between the two wheels. This not only improves the device's performance in terms of rear wheel stability and load-bearing capacity, but also greatly enhances its ability to adapt to different road conditions and load conditions.

[0045] It is understood that the adjustable rear wheel extension device provided in this embodiment can be applied to a suitcase, that is, the front shell 110 is fixedly connected to the bottom of the suitcase. When the user needs to increase the load-bearing capacity of the suitcase or needs to maintain stability on uneven roads, the distance between the first rear wheel assembly and the second rear wheel assembly can be adjusted by operating the extension component.

[0046] It is understood that the adjustable rear wheel extension device provided in this embodiment can also be applied to electric scooters, that is, the front shell 110 is fixedly connected to the bottom of the electric scooter. When the user needs to adjust the stability and flexibility of the electric scooter according to different road conditions, the distance between the first rear wheel assembly and the second rear wheel assembly can be adjusted by operating the extension component, thereby adapting to different riding needs. This design not only improves the practicality and adaptability of the electric scooter, but also brings users a more convenient and comfortable riding experience.

[0047] In this embodiment, for the first rear wheel 141, both the first force and the second force are forces directly applied to the first rear wheel 141 by the operator, or forces applied to the first rear wheel 141 through the second rear wheel 143, the second adjusting plate 144, the transmission gear, and the first adjusting plate 142; the directions of the first force and the second force are opposite. Similarly, for the second rear wheel 143, both the first force and the second force are forces directly applied to the second rear wheel 143 by the operator, or forces applied to the second rear wheel 143 through the first rear wheel 141, the first adjusting plate 142, the transmission gear, and the second adjusting plate 144.

[0048] Specifically, the front shell 110 includes: a first shell 111 and a second shell 112, which are detachably connected; the first shell 111 has a plurality of first cavities on the side facing the second shell 112, and the second shell 112 has a plurality of second cavities 114 that cooperate with the first cavities on the side facing the first shell 111, the first cavities and the second cavities 114 cooperate to form a first receiving cavity, and the first shell 111 and the second shell 112 form a second receiving cavity, which is disposed to avoid the first receiving cavity.

[0049] Understandably, the detachable connection design of the first housing 111 and the second housing 112 facilitates the maintenance and replacement of the internal components, improving the maintainability and service life of the device. Simultaneously, the clearance arrangement between the first and second accommodating cavities optimizes the internal spatial layout of the device, allowing the components to be arranged compactly and orderly, thereby reducing the size and weight of the device and facilitating its portability and transportation.

[0050] Specifically, the connecting assembly includes: a connecting rod 131, disposed between the front shell 110 and the rear shell 120, one end of the connecting rod 131 being slidably connected to the front shell 110 in the front-rear direction, and the other end of the connecting rod 131 being fixedly connected to the rear shell 120; and a connecting sleeve 132, a plurality of connecting sleeves 132 being sleeved on the outside of the connecting rod 131 and slidably connected to the connecting rod 131, and the connecting sleeves 132 being engaged with the corresponding first receiving cavity.

[0051] Understandably, the sliding connection design of the connecting rod 131 and the connecting sleeve 132, as well as the snap-fit ​​method between the connecting sleeve 132 and the first accommodating cavity, ensures stable sliding of the connecting assembly in the front-to-back direction while also firmly fixing it to the rear housing 120. This not only enhances the stability of the device but also allows the first and second rear wheel assemblies to maintain a smooth and stable movement trajectory when adjusting their spacing, avoiding safety hazards caused by shaking or instability.

[0052] Specifically, the first rear wheel assembly includes a first rear wheel 141; the second rear wheel assembly includes a second rear wheel 143.

[0053] Specifically, the extension assembly includes: a first adjusting plate 142, one end of which is slidably connected to the rear housing 120 in the axial direction of the first rear wheel 141, and the other end of which is rotatably connected to the first rear wheel 141, with a first rack 145 provided on one side of the first adjusting plate 142; a second adjusting plate 144, one end of which is slidably connected to the rear housing 120 in the axial direction of the second rear wheel 143, and the other end of which is rotatably connected to the second rear wheel 143, with a second rack 146 provided on one side of the second adjusting plate 144; and an adjusting rod 151, which has transmission teeth on its sides, with the two sides of the transmission teeth meshing with the first rack 145 and the second rack 146 respectively.

[0054] It is understood that the first adjusting plate 142 and the second adjusting plate 144 are slidably connected to the rear housing 120 along their respective rear wheel axes. Through the meshing of the transmission gears with the first rack 145 and the second rack 146, precise adjustment of the distance between the first and second rear wheel assemblies is achieved. When the user needs to increase or decrease the rear wheel distance, they only need to drive the motor to rotate the adjusting rod 151. Through the meshing of the transmission gears with the first rack 145 and the second rack 146, the transmission gears will drive the first rack 145 and the second rack 146 to move in opposite or the same direction, thereby driving the first adjusting plate 142 and the second adjusting plate 144 to push or pull the first and second rear wheel assemblies to perform corresponding movements. This not only simplifies the operation process but also improves the accuracy and efficiency of the adjustment. At the same time, the sliding connection between the first adjusting plate 142 and the second adjusting plate 144 and the rear housing 120 ensures the stability and reliability of the extension assembly when adjusting the distance, avoiding situations where loosening or jamming affects the performance.

[0055] Specifically, the expansion assembly includes: a third housing 115, which is fixed inside the second accommodating cavity, and one end of the adjusting rod 151 passes through the third housing 115 and slides in the front-back direction with the third housing 115; and a motor, which is disposed inside the third housing 115 and is connected to the adjusting rod 151.

[0056] Understandably, the third housing 115 not only provides stable support for the adjusting rod 151, but also restricts the movement of the adjusting rod 151 in directions other than the front-back direction, further enhancing the stability and reliability of the extension assembly. Simultaneously, the fixed connection between the third housing 115 and the second accommodating cavity ensures that the entire extension assembly is more securely integrated into the device, preventing loosening or damage due to vibration or impact.

[0057] Specifically, the adjustable rear wheel extension device also includes a limiting assembly, which includes a first limiting groove and a second limiting groove 122 respectively disposed on opposite sides of the rear shell 120, a first limiting rod 161 disposed on the first adjusting plate 142, and a second limiting rod 162 disposed on the second adjusting plate 144. The first limiting rod 161 and the first limiting groove are slidably engaged in the axial direction of the first rear wheel 141, and the second limiting rod 162 and the second limiting groove 122 are slidably engaged in the axial direction of the second rear wheel 143. The lengths of the first limiting groove and the second limiting groove 122 are both less than the length of the rear shell 120 in the axial direction of the first rear wheel 141.

[0058] Understandably, the design of the limiting components further enhances the safety and stability of the device when adjusting the rear wheel clearance. The first limiting rod 161 and the second limiting rod 162 slide in conjunction with the first limiting groove and the second limiting groove 122, respectively, ensuring that the first adjusting plate 142 and the second adjusting plate 144 can move smoothly and accurately along their respective rear wheel axes, avoiding adjustment errors caused by offset or misalignment. Simultaneously, the lengths of the first limiting groove and the second limiting groove 122 are less than the length of the rear shell 120 along the corresponding rear wheel axis. This design limits the maximum range of movement of the first adjusting plate 142 and the second adjusting plate 144, preventing damage or malfunction of the device due to over-adjustment.

[0059] Specifically, one end of the adjusting rod 151 is provided with an external thread, and the other end of the adjusting rod 151 is rotatably connected to the rear shell 120; the limiting assembly also includes a third limiting rod 152 and a limiting sleeve 153. The third limiting rod 152 is provided on the adjusting rod 151 and is located near the other end of the adjusting rod 151, and extends outward along the radial direction of the adjusting rod 151; the limiting sleeve 153 is provided on the rear shell 120 and is rotatably connected to the rear shell 120, and the limiting sleeve 153 is sleeved on the adjusting rod 151. The limiting sleeve 153 is provided with a third limiting groove 154 that cooperates with the third limiting rod 152, and the third limiting groove 154 is spirally opened along the axial direction of the limiting sleeve 153.

[0060] Understandably, the external thread design at one end of the adjusting rod 151 and its rotatable connection with the rear housing 120 allow the adjusting rod 151 to rotate smoothly and precisely under the drive of the motor. This, in turn, enables fine-tuning of the distance between the first and second rear wheel assemblies through the meshing of the transmission teeth with the first rack 145 and the second rack 146. This not only improves the accuracy of the adjustment but also ensures the stability and reliability of the adjustment process. Simultaneously, the cooperative design of the third limiting rod 152 and the limiting sleeve 153 further enhances the stability and reliability of the adjusting rod 151 during adjustment. The third limiting rod 152 extends radially outward along the adjusting rod 151 and engages with the spirally opened third limiting groove 154 on the limiting sleeve 153, ensuring that the adjusting rod 151 moves smoothly and accurately during rotation, avoiding adjustment errors caused by wobbling or offset. This not only improves the accuracy and efficiency of the adjustment but also provides users with a smoother and more comfortable operating experience.

[0061] Specifically, the adjustable rear wheel extension device also includes a first bearing 155 disposed between the limiting sleeve 153 and the rear housing 120, and a second bearing 157 disposed between the other end of the adjusting rod 151 and the rear housing 120.

[0062] Understandably, the placement of the first bearing 155 and the second bearing 157 ensures smoother and more flexible rotational connections between the limiting sleeve 153 and the rear housing 120, and between the adjusting rod 151 and the rear housing 120, respectively. This not only reduces frictional resistance during rotation, improving the durability and service life of the device, but also makes it easier and less strenuous for users to adjust the rear wheel clearance.

[0063] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An adjustable rear wheel extension device, characterized in that, include: device body; The front shell is located on the front side of the device body; The rear shell is located at the rear of the device body; A connecting component is disposed between the front shell and the rear shell, one end of the connecting component is slidably connected to the front shell in the front-rear direction, and the other end of the connecting component is fixedly connected to the rear shell; The first rear wheel assembly and the second rear wheel assembly are respectively provided on opposite sides of the rear shell; An extension component is provided, wherein the extension component can apply a first force to the first rear wheel assembly and the second rear wheel assembly, the first force causing the first rear wheel assembly and the second rear wheel assembly to move in opposite directions, and the extension component can apply a second force to the first rear wheel assembly and the second rear wheel assembly, the second force causing the first rear wheel assembly and the second rear wheel assembly to move relative to each other.

2. The adjustable rear wheel extension device according to claim 1, characterized in that, The front shell includes: A first housing and a second housing, wherein the first housing and the second housing are detachably connected; The first housing has a plurality of first cavities on the side facing the second housing, and the second housing has a plurality of second cavities on the side facing the first housing that cooperate with the first cavities. The first cavities and the second cavities cooperate to form a first receiving cavity, and the first housing and the second housing form a second receiving cavity. The second receiving cavity is disposed away from the first receiving cavity.

3. The adjustable rear wheel extension device according to claim 2, characterized in that, The connection component includes: A connecting rod is disposed between the front shell and the rear shell. One end of the connecting rod is slidably connected to the front shell in the front-rear direction, and the other end of the connecting rod is fixedly connected to the rear shell. A connecting sleeve, a plurality of the connecting sleeves are sleeved on the outside of the connecting rod and slidably connected to the connecting rod, and the connecting sleeves are engaged with the corresponding first receiving cavity.

4. The adjustable rear wheel extension device according to claim 3, characterized in that, The first rear wheel assembly includes a first rear wheel; the second rear wheel assembly includes a second rear wheel.

5. The adjustable rear wheel extension device according to claim 4, characterized in that, The extended components include: A first adjusting plate, one end of which is slidably connected to the rear shell in the axial direction of the first rear wheel, and the other end of which is rotatably connected to the first rear wheel, and a first rack is provided on one side of the first adjusting plate; The second adjusting plate has one end slidably connected to the rear shell in the axial direction of the second rear wheel, and the other end rotatably connected to the second rear wheel. A second rack is provided on one side of the second adjusting plate. An adjusting rod is provided with transmission teeth, the two sides of which mesh with the first rack and the second rack, respectively.

6. The adjustable rear wheel extension device according to claim 5, characterized in that, The extended components include: The third housing is fixed inside the second accommodating cavity, and one end of the adjusting rod passes through the third housing and slides in the front-back direction with the third housing; The motor is located inside the third housing and is connected to the adjusting rod.

7. The adjustable rear wheel extension device according to claim 6, characterized in that, The adjustable rear wheel extension device further includes a limiting component, which includes a first limiting groove and a second limiting groove respectively disposed on opposite sides of the rear shell, a first limiting rod disposed on the first adjusting plate, and a second limiting rod disposed on the second adjusting plate. The first limiting rod and the first limiting groove are slidably engaged in the axial direction of the first rear wheel, and the second limiting rod and the second limiting groove are slidably engaged in the axial direction of the second rear wheel. The lengths of both the first limiting groove and the second limiting groove are less than the length of the rear shell along the axial direction of the first rear wheel.

8. The adjustable rear wheel extension device according to claim 7, characterized in that, One end of the adjusting rod is provided with an external thread, and the other end of the adjusting rod is rotatably connected to the rear shell; The limiting assembly further includes a third limiting rod and a limiting sleeve. The third limiting rod is disposed on the adjusting rod and is located near the other end of the adjusting rod, extending outward along the radial direction of the adjusting rod. The limiting sleeve is disposed on the rear shell and is rotatably connected to the rear shell. The limiting sleeve is sleeved on the adjusting rod. The limiting sleeve is provided with a third limiting groove that cooperates with the third limiting rod. The third limiting groove is spirally opened along the axial direction of the limiting sleeve.

9. The adjustable rear wheel extension device according to claim 8, characterized in that, The adjustable rear wheel extension device further includes a first bearing disposed between the limiting sleeve and the rear shell, and a second bearing disposed between the other end of the adjusting rod and the rear shell.

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