A fitness bike

Abstract

The present invention relates to the field of fitness equipment, including a fitness bike, comprising a frame, a seat tube arranged on the frame, and a seat cushion arranged on the upper end of the seat tube; the frame comprises an outer tube, the seat tube is inserted into the interior of the outer tube and can be lifted and slid along the outer tube; the upper end of the seat tube is fixed with a base, a chuck seat assembly is arranged on the base, the lower end of the chuck seat assembly is slidably arranged on the base, and the seat cushion is arranged on the chuck seat assembly; the chuck seat assembly and the base are connected by a locking assembly. The chuck seat assembly comprises a chuck fixing seat and two groups of chuck assemblies; the two groups of chuck assemblies are fitted on the two side walls of the chuck fixing seat, and the chuck assemblies can rotate relative to the chuck fixing seat along their axis; the inner wall of the chuck assembly and the side wall of the chuck fixing seat are constructed with a positioning structure arranged circumferentially along the rotation axis of the chuck assembly. The fitness bike facilitates adjustment of the seat cushion in height, front-back position, and tilt angle.

Description

Technical Field

[0001] The present invention relates to the field of fitness equipment, in particular to a fitness bike. Background Art

[0002] Due to the fast pace of life in cities, the increasing economic level and the increasing attention people pay to their own physical health, more and more office workers will go to the gym or buy sports equipment at home after get off work to enhance their physical fitness; among them, bicycle-type sports equipment are more popular, such as spinning bikes, water resistance bikes, etc., and these bicycle-type sports equipment generally include several parts, including a frame, a pedal assembly, a base, an armrest device and a seat assembly; the user can sit on the seat with the body forward, then hold the armrest device with his hands and step on the pedal assembly with his feet to simulate cycling to shape the body and lose fat, so as to maintain the exercise required by the body.

[0003] The seat cushions in the bicycle sports equipment currently on the market need to be able to achieve three adjustment requirements: angle adjustment, fore-and-aft sliding adjustment, and seat height adjustment. The fore-and-aft sliding adjustment of the seat cushion is used to adjust the fore-and-aft position of the seat cushion; the seat cushion angle adjustment refers to the ability of the seat cushion to adjust the relative height of the front and rear ends of the seat cushion, that is, to adjust the tilt angle of the seat cushion, so as to meet different riding needs; seat height adjustment refers to adjusting the height of the seat cushion relative to the frame to meet the needs of users of different heights.

[0004] The prior art, such as the Chinese utility model patent with the announcement number "CN216395160U", describes a seat cushion locking adjustment device and sports equipment, including a seat cushion assembly, an adjustment assembly and a base; the adjustment assembly is slidably arranged on the base, the seat cushion assembly is connected to the adjustment assembly, the base is provided with a slide rail, the adjustment assembly includes a movable seat and an adjustment handle, the movable seat is provided with a clamping portion, the movable seat is arranged on the slide rail through the clamping portion, the clamping portion includes at least one clamping arm that can move relative to the movable seat, the adjustment handle is rotatably connected to the movable seat, and the adjustment handle rotates to abut against the side wall of the clamping arm to drive the clamping portion to clamp, lock or unlock and move on the slide rail.

[0005] Specifically, according to paragraph

[0045] of its specification: Since the distance between the inner side walls of the two hinged parts mentioned above decreases in a spiral manner along the circumference, the straight-line distance between the two abutting steps is the smallest. When the adjustment handle is rotated, the distance between the two abutting steps gradually decreases, causing the clamping arm and the movable seat to gradually move closer, and the distance between the clamping wall and the sliding arm to gradually move closer, and the clamping opening to gradually shrink, thereby clamping the slide rail. However, the above solution uses the clamping of the clamping wall and the sliding arm to slide on the slide rail on the one hand, and also needs to be positioned on the slide rail on the other hand. However, the positioning effect of the clamping fixation method is limited and slipping is prone to occur.

[0006] Furthermore, the specification of the above-mentioned prior patent describes a seat cushion angle adjustment structure, specifically, the bottom of the seat cushion assembly is movably adjustable and detachably connected to the movable seat, and the seat cushion assembly can be rotated relative to the movable seat to adjust the tilt angle of the seat cushion; based on the above-mentioned technical solution, it can be implemented as follows: the seat cushion assembly is hinged to the movable seat, the tilt angle of the seat cushion assembly is first rotated to adjust the tilt angle, and then fixed in place by bolts or the like; and in this embodiment, specifically, the seat cushion assembly includes a seat cushion, the bottom of the seat cushion is provided with arc-shaped half teeth, and the top surface of the movable seat includes at least one section of tooth surface, and the tooth surface is downward The depression forms an arc-shaped tooth surface, and the arc-shaped half-tooth is adapted to and meshes with the arc-shaped tooth surface. A longitudinal through-hole is provided in the middle of the tooth surface, and an adjustment long hole is provided in the middle of the arc-shaped half-tooth. The seat cushion assembly also includes a bolt, and the top end of the bolt passes through the through-hole and the adjustment long hole in sequence and is connected to the seat cushion. The seat cushion, the arc-shaped half-tooth and the movable seat are connected and fixed by the bolt. The specific angle adjustment operation based on this technical solution is as follows: first loosen the bolt and the seat cushion, at which time the arc-shaped half-tooth and the movable seat are movable, and then the arc-shaped half-tooth is rotated to adjust the required seat cushion pitch angle, and then it is screwed into place by the bolt. However, the above solution has two shortcomings. First, the bolt is arranged longitudinally. When the seat cushion angle needs to be adjusted, it is necessary to tighten the bolt from under the seat cushion during use. The operating space is narrow and very inconvenient. Second, the above solution constructs the through-hole and the adjustment long hole on the arc-shaped half-tooth and the arc-shaped tooth surface, which affects the meshing strength of the two.

[0007] For example, the Chinese utility model patent text with the prior art publication number "CN215995495U" describes a seat cushion support assembly and sports equipment with quick locking and adjustment, including a seat tube and a sleeve, the sleeve being sleeved on the outside of the seat tube, the seat tube being able to move axially relative to the sleeve, and also including a locking assembly, a locking channel communicating with the inner cavity of the sleeve being provided on the side wall at one end of the sleeve, the driving part of the locking assembly being hinged to the locking channel, and the locking part of the locking assembly being abutted against the outer side wall of the seat tube located in the inner cavity of the sleeve under the action of the driving part, so that the seat tube and the sleeve are locked in position or unlocked for movement; and the locking or unlocking effect can be achieved relatively quickly. In a specific solution, the locking assembly includes a locking block and a rotating handle, the rotating handle includes a rotating part and a holding part formed integrally with the rotating part, the rotating part is hinged to the locking channel, and the outer wall surface of the rotating part in the circumferential direction includes an arc segment and a flat segment; by rotating the rotating part, the arc segment or the flat segment is switched to resist or avoid the locking block, thereby realizing locking positioning or unlocking movement.

[0008] The seat support assembly locks the seat tube simply by squeezing the locking block inward during the rotation of the handle, causing one side wall of the locking block to abut against the outer wall of the seat tube. However, this solution only presses the locking block against the outer wall of one side of the seat tube, which can easily deform the seat tube and make it difficult to ensure the seat tube's positioning strength. Summary of the Invention

[0009] In order to solve the above problems, an object of the present invention is to provide an exercise bike that facilitates adjustment of the seat cushion in height, front-rear position and tilt angle.

[0010] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0011] A fitness bike comprises a frame, a seat tube arranged on the frame, and a seat cushion arranged on the upper end of the seat tube; the characteristics are that: the frame comprises an outer tube, the seat tube is passed through the interior of the outer tube and can be lifted and slid along the outer tube; the upper end of the seat tube is fixed to a base, a chuck seat assembly is provided on the base, the lower end of the chuck seat assembly is slidably arranged on the base back and forth, and the seat cushion is provided on the chuck seat assembly; the base is provided with linear through holes arranged in the front-back direction, the chuck seat assembly and the base are connected by a locking assembly, the locking assembly comprises a screw, a nut and a first adjustment handle, after the screw passes through the linear through holes on the chuck seat assembly and the base, the nut is connected to the end of the screw; the first adjustment handle is sleeved on the screw and circumferentially linked to the screw, and the nut is circumferentially positioned relative to the base;

[0012] The chuck seat assembly includes a chuck fixing seat and two groups of chuck assemblies; the two groups of chuck assemblies are fitted on the two side walls of the chuck fixing seat, and the chuck assemblies can rotate relative to the chuck fixing seat along their axes; the inner wall of the chuck assembly and the side wall of the chuck fixing seat are constructed with positioning structures arranged circumferentially along the rotation axis of the chuck assembly, and the chuck assembly can be circumferentially positioned with the chuck fixing seat based on the positioning structures, and at least two beams are provided at the lower end of the seat cushion and are respectively fixed to the two groups of chuck assemblies;

[0013] A locking rod is fixedly provided inside the outer tube, and the locking rod is arranged along the extension direction of the inner cavity of the outer tube; a locking assembly for locking the locking rod and a control assembly for adjusting the locking assembly are connected to the seat tube; the locking assembly includes an adjusting seat fixedly provided at the lower end of the seat tube, a locking plate sleeve provided in the adjusting seat, and a plurality of adjusting gaskets overlappingly arranged inside the locking plate sleeve; an axial hole is provided in the adjusting gasket, and the plurality of adjusting gaskets are all sleeved on the locking rod; the inner end portion of the control assembly is connected to the locking plate sleeve for controlling the radial angle of the adjusting gasket relative to the locking rod inside it; when the adjusting gasket is radially tilted relative to the locking rod, the inner wall of the through hole of the adjusting gasket abuts against the locking rod, and the seat tube and the outer tube are locked; when the adjusting gasket is arranged radially along the locking rod, the inner wall of the through hole of the adjusting gasket does not contact the locking rod, the seat tube can be adjusted by sliding relative to the outside.

[0014] The present invention adopts the above technical solution, which relates to an exercise bike, comprising a frame, a seat tube arranged on the frame, and a seat cushion arranged on the upper end of the seat tube; and has the following three advantages:

[0015] 1. The seat cushion of this exercise bike is mounted on a chuck base assembly, the lower end of which slides back and forth on a base. The chuck base assembly can be moved back and forth relative to the base to achieve forward and backward sliding adjustment of the seat cushion. Furthermore, the chuck base assembly and the base in this solution are connected by a locking assembly. The locking assembly's screw passes through the chuck base assembly and the base and then connects to a nut, thereby securing the chuck base assembly and the base relative to each other. Furthermore, an adjustment handle is sleeved onto the screw and circumferentially interlocks with the screw. When the screw and nut are locked to the chuck base assembly and the base, turning the adjustment handle in the reverse direction loosens the screw by a certain angle, thereby loosening the screw and nut. The seat cushion and the chuck base assembly connected thereto can now be moved back and forth for forward and backward adjustment. After sliding to the desired position, turning the adjustment handle in the forward direction locks the seat cushion. During this forward and backward adjustment process, the screw slides along a linear through-hole. Based on this structure, this solution can lock or release the seat cushion by simply turning the adjustment handle, thereby achieving forward and backward sliding adjustment of the seat cushion. In addition, this solution uses a screw and nut connection method to lock the chuck seat assembly and the base, which provides better connection stability.

[0016] 2. This seat angle adjustment device features at least two beams at the lower end of the seat cushion, each secured to two sets of chuck assemblies. These chuck assemblies are fitted onto the side walls of a chuck holder and are capable of circumferential rotation relative to the holder, with positioning mechanisms employed to achieve circumferential positioning. This solution utilizes a side-fitting, rotational positioning method, replacing the toothed surface on the rotating surface described in the aforementioned prior patent. This provides greater lateral access to the seat cushion and facilitates angle adjustment.

[0017] 3. The seat tube in this seat tube height adjustment device is capable of rising and sliding relative to an outer tube on the frame. The seat cushion is mounted on the upper end of the seat tube, allowing the seat tube and its cushion to be adjusted longitudinally relative to the frame. Based on this, this solution includes a locking rod fixedly disposed within the outer tube, and a locking assembly disposed at the lower end of the seat tube, which is connected to a control assembly. The locking assembly comprises multiple adjustment washers disposed within a locking sleeve, and an adjustment seat secured to the lower end of the seat tube. The adjustment seat is configured to secure the locking sleeve and its multiple adjustment washers to the lower end of the seat tube. The multiple adjustment washers are mounted on the locking rod, and the control assembly is connected to the locking sleeve to adjust the angle of the multiple adjustment washers within the locking sleeve relative to the locking rod. When the adjustment washers are tilted relative to the locking rod, the inner wall of the adjustment washers' through-hole abuts the locking rod, locking the seat tube to the outer tube. When the adjustment washers are positioned radially along the locking rod, the inner wall of the adjustment washers' through-hole is concentric with the locking rod, preventing contact, allowing the seat tube to slide relative to the outer tube. The above structure uses a locking rod and an adjusting washer to cooperate. On the one hand, the locking and adjusting part is set in the center of the seat tube, and no longer acts on the side wall of the seat tube, thereby preventing the seat tube from being deformed; on the other hand, multiple adjusting washers are locked with the locking rod to ensure the positioning strength of the seat tube.

[0018] Preferably, the upper end surface of the base is provided with a slide rail, and the lower end of the chuck seat assembly is provided with a slide groove; the slide groove of the chuck seat assembly is sleeved onto the slide rail of the base; the slide rail and the slide groove are embedded in each other to achieve relative sliding between the chuck seat assembly and the base. In a specific embodiment, a linear groove is provided in the middle portion of the base along the direction of the slide rail, and the upper ends of the two side walls of the linear groove form the slide rail; the linear through hole is formed in the bottom plate below the linear groove, and a decorative cover is provided on the rear side of the base to close the rear end opening of the linear groove. In this embodiment, the linear groove is formed in the middle portion of the base, thereby hollowing out the middle portion of the base between the two slide rails, allowing the slide rails to slightly deform to the sides, making it easier for the slide groove of the chuck seat assembly to be embedded in the slide rail. Furthermore, the decorative cover is used to close the rear end opening of the linear groove, which not only has an aesthetic effect and prevents safety issues such as hands from reaching from the rear end, but also supports the two slide rails, ensuring a good fit between the slide rails and the slide groove, and avoiding gaps that may cause shaking.

[0019] Preferably, the first adjustment handle comprises a sleeve portion that fits over the screw and circumferentially engages with it, and a handle portion radially disposed with its inner end connected to the sleeve portion. In this embodiment, the inner hole of the sleeve portion matches the outer contour of the screw at the location where it fits, thereby achieving circumferential engagement during engagement. The handle portion is intended for the user to grasp and manipulate. With this structure and because the adjustment handle is located at the rear of the seat cushion, the rotation angle of the adjustment handle is generally less than 180°.

[0020] Preferably, the two sets of chuck assemblies are coaxially passed through the screw assembly on both sides of the chuck fixing seat, and the end of the screw assembly acts on the chuck assembly along its axial direction, so that the chuck assembly fits against the side wall of the chuck fixing seat; in this solution, the screw assembly is used to clamp the chuck assembly, so that the chuck assembly fits against the side wall of the chuck fixing seat. When the seat cushion tilt angle needs to be adjusted, it is only necessary to loosen the screw assembly with a wrench, and the chuck assembly will no longer be tightly attached to the side wall of the chuck fixing seat, allowing for convenient and effortless angle adjustment; and when the adjustment is completed and the angle needs to be fixed, it is only necessary to tighten the screw assembly. In addition, based on the above solution, the screw assembly is only passed through the axis of the chuck assembly and the chuck fixing seat, and does not affect the setting of the axial positioning structure. Therefore, this connection structure does not affect the positioning strength of the chuck assembly and the chuck fixing seat.

[0021] In a further embodiment, a wrench capable of turning the screw assembly can be detachably connected to the chuck mount. A recess is formed between the two side walls of the chuck mount at its upper end, and a magnet is embedded in the recess. The wrench is placed in the recess and secured by the magnet. In this embodiment, the wrench is magnetically attached to the chuck mount, making it easily accessible when adjusting the seat recline angle. Furthermore, this embodiment embeds a magnet within the recess. In addition to magnetically securing the wrench, the recess surrounds the wrench, making it less likely to fall.

[0022] Preferably, the positioning structure comprises a plurality of positioning grooves provided on the inner wall of the chuck assembly and a plurality of positioning protrusions provided on the outer wall of the chuck holder. The plurality of positioning grooves are arranged circumferentially along the inner wall of the chuck assembly, and the plurality of positioning protrusions are arranged circumferentially along the outer wall of the chuck holder. The positioning grooves and positioning protrusions are respectively constructed as radially extending linear grooves and linear protrusions. In this solution, circumferential positioning is achieved based on the circumferential arrangement of the plurality of positioning grooves and positioning protrusions. The positioning grooves and positioning protrusions are further constructed as radially extending linear grooves and linear protrusions, respectively. This increases the strength of the circumferential positioning and ensures that the circumferential positioning is not prone to slippage.

[0023] Preferably, the chuck assembly includes a chuck with an inner end surface fitted to a chuck fixing seat, and a card cover provided on the outer end of the chuck; the positioning structure is constructed on the inner end wall of the chuck, the screw assembly passes through the card cover and the chuck, and presses the card cover against the chuck; the beam is supported between the card cover and the chuck; a support portion for supporting the beam is constructed on the outer wall of the chuck or the inner wall of the card cover, and a support bracket is constructed on the support portion; the card cover is constructed as a U-shaped cover body with an opening facing the chuck, and the two U-shaped arms of the card cover are located on the upper and lower sides of the support portion and are both supported on the outer end surface of the chuck; when the beam is in the support bracket, the U-shaped arms of the card cover are positioned to cover the beam. In this solution, the beam is positioned and supported inside the support bracket of the support portion, and when the screw assembly passes through the card cover and the chuck and presses the two together, the U-shaped arms of the card cover are positioned to cover the beam, thereby achieving a secure positioning of the beam.

[0024] Preferably, the adjustment seat is provided with an adjustment cavity, with through-holes formed on the upper and lower end surfaces of the adjustment cavity. The locking plate sleeve and the multiple adjustment washers inside it are embedded in the adjustment cavity, and the locking rod extends upward from below through the through-hole of the adjustment seat and the axial holes of the multiple adjustment washers. In this solution, the locking rod passes through the adjustment seat and the multiple adjustment washers inside it, thereby positioning the multiple adjustment washers inside the adjustment seat.

[0025] In a specific embodiment, the locking assembly further comprises an adjusting compression spring within the adjusting cavity, the adjusting compression spring being sleeved on a locking rod below the adjusting washer, the upper end of the adjusting compression spring being elastically supported against the adjusting washer; the adjusting seat axially limits one radial end of the adjusting washer, and the inner end of the control assembly is connected to a locking plate sleeve at the other radial end of the adjusting washer; when the adjusting washer is only elastically supported by the adjusting compression spring, the adjusting washer radially tilts relative to the locking rod, and the inner wall of the through hole of the adjusting washer abuts against the locking rod. In this embodiment, an adjusting compression spring is further provided below the adjusting washer, sleeved on the locking rod and providing axial support to the adjusting washer above it along the locking rod. However, because the adjusting seat axially limits one radial end of the adjusting washer, the adjusting washer radially tilts relative to the locking rod only when elastically supported by the adjusting compression spring, thereby achieving the locking purpose.

[0026] When the seat tube height needs to be adjusted, the control assembly needs to be operated to drive the locking plate sleeve, so that the adjustment gasket inside the locking plate sleeve is aligned, and the inner wall of the through hole of the adjustment gasket is concentric with the locking rod, thereby achieving unlocking.

[0027] In a specific embodiment, a hook is formed at one radial end of the topmost adjustment washer. The adjustment seat is provided with a hook opening that communicates with the adjustment cavity. The hook of the adjustment washer is located within the hook opening of the adjustment seat. The adjustment washer is elastically supported by the adjustment compression spring, with the upper end of the hook supporting the top wall of the hook opening, causing the adjustment washer to be radially inclined relative to the locking rod. In this embodiment, a hook is formed at one radial end of the adjustment washer and is restrained by the side wall of the upper end of the hook opening of the adjustment seat. This not only tilts the adjustment washer relative to the locking rod, achieving a locking effect, but also prevents the adjustment washer and the locking plate sleeve covering it from detaching from the adjustment seat.

[0028] Preferably, the locking plate sleeve comprises two sleeves, one on each side of the adjusting gasket, with the front ends of the two sleeves forming a sleeve cavity for accommodating the multiple adjusting gaskets. The rear ends of the two sleeves are butted together and provided with a hinge hole. The sleeves have positioning holes formed on the side walls of the sleeve cavity, and at least a portion of the outer edges of the multiple adjusting gaskets extend out of the sleeve cavity through the positioning holes. In this solution, the locking plate sleeve is formed by butting the two sleeves together. The front sleeve cavity is used to accommodate the adjusting gasket, and the rear hinge hole is used to connect to the end of the control assembly. The outer edges of the multiple adjusting gaskets partially extend out of the positioning holes, so that the multiple adjusting gaskets are engaged in the positioning holes. Therefore, the angle of the inner adjusting gasket can be synchronously controlled by operating the locking plate sleeve.

[0029] Preferably, a transverse tube section is disposed at the lower end of the locking lever, the end of which contacts the outer tube and is connected via a screw connection. In this solution, the transverse tube section serves not only to achieve connection with the outer tube, but also to define the lowest position of the seat tube, i.e., the minimum distance the seat tube can extend relative to the outer tube. Specifically, when the lower end of the adjustment seat contacts the transverse tube section, the seat tube cannot move further downward.

[0030] Preferably, a base is fixedly mounted on the upper end of the seat tube, and the control assembly includes a second adjustment handle hingedly connected to the base, and an adjustment link located within the seat tube, the upper end of the adjustment link connected to the second adjustment handle, and the lower end connected to the locking plate sleeve. In a specific embodiment, the upper and lower ends of the adjustment link are provided with adjustment U-shaped seats; the upper adjustment U-shaped seat is hingedly connected to the rotating shaft of the second adjustment handle via a connecting plate, and the lower adjustment U-shaped seat is hingedly connected to the locking plate sleeve.

[0031] Based on the above solution, when operating the second adjustment handle, the second adjustment handle presses down on the connecting plate and the adjustment link along its hinged end. The lower end of the adjustment link, via the U-shaped seat, presses down on the locking plate. The above solution states that when the adjustment washer is supported only by the elastic force of the adjustment compression spring, the adjustment washer tilts radially relative to the locking rod, and the inner wall of the adjustment washer's through-hole abuts the locking rod. Here, the second adjustment handle presses down on the adjustment washer via the adjustment link, thereby adjusting the adjustment washer from an inclined position to a straightened position, thereby unlocking the lock.

[0032] Preferably, a seat tube holder is embedded in the upper end of the outer tube, and the seat tube is inserted into the seat tube holder. The structure and effect of the seat tube holder can refer to the pipe plug described in the prior patent publication number "CN215995495U". BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The structural exploded view of the exercise bike shown is created for the present invention.

[0034] Figure 2 This is a side view of the seat tube and seat cushion connection structure of the exercise bike.

[0035] Figure 3 This is a three-dimensional diagram of the seat cushion installation structure.

[0036] Figure 4 for Figure 1 A magnified view of the upper structure.

[0037] Figure 5 for Figure 1 A magnified view of the middle structure.

[0038] Figure 6 Schematic diagram of the seat tube height adjustment structure.

[0039] Figure 7 for Figure 6 Magnified view of part A.

[0040] Figure 8 Schematic diagram of the locking state of the locking rod and the adjusting gasket.

[0041] Figure 9 Schematic diagram of the unlocked state of the locking lever and adjusting washer. Implementation Method

[0042] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0045] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] like Figure 1-9 As shown, this embodiment relates to a fitness bike, comprising a frame, a seat tube 2 arranged on the frame, and a seat cushion 3 arranged on the upper end of the seat tube 2 .

[0048] The upper end of the seat tube 2 is fixed with a base 4, on which a chuck seat assembly 5 is provided. The lower end of the chuck seat assembly 5 is slidably mounted on the base 4, and the seat cushion 3 is mounted on the chuck seat assembly 5. In the specific embodiment, the base 4 is provided with linear through-holes 41 arranged in the front-to-back direction, and the lower end of the chuck seat assembly 5 is slidably mounted on the base 4. The chuck seat assembly 5 and the base 4 are connected by a locking assembly, which includes a screw 61, a nut 62, and a first adjustment handle 63. After the screw 61 passes through the linear through-holes 41 on the chuck seat assembly 5 and the base 4, the nut 62 is connected to the end of the screw 61. The first adjustment handle 63 is sleeved on the screw 61 and circumferentially linked with the screw 61. The nut 62 is circumferentially positioned relative to the base 4. The seat cushion 3 of this exercise bike is mounted on a chuck base assembly 5, the lower end of which is slidably mounted on a base 4. The chuck base assembly 5 can be moved back and forth relative to the base 4 to achieve forward and backward sliding adjustment of the seat cushion 3. Furthermore, the chuck base assembly 5 and the base 4 in this embodiment are connected by a locking assembly. A screw 61 of the locking assembly passes through the chuck base assembly 5 and the base 4 and is then connected to a nut 62, thereby securing the chuck base assembly and the base 4 relative to each other. Furthermore, a first adjustment handle 63 is sleeved onto the screw 61 and circumferentially interlocked with the screw 61. When the screw 61 and the nut 62 are locked between the chuck base assembly 5 and the base 4, turning the first adjustment handle 63 in the opposite direction loosens the screw 61 by a certain angle, thereby loosening the screw 61 and the nut 62. At this point, the seat cushion 3 and the chuck base assembly 5 connected thereto can be moved back and forth to achieve forward and backward adjustment. After sliding to the desired position, turning the first adjustment handle 63 in the forward direction locks the seat cushion 3. During the aforementioned front-to-back adjustment process, the screw rod 61 slides along the linear through hole 41 .

[0049] Based on the above structure, this solution only needs to turn the first adjustment handle 63 to control the locking or loosening of the seat cushion 3, and then adjust the sliding of the seat cushion 3 forward and backward. In addition, this solution uses the screw 61 and nut 62 to lock the chuck seat assembly 5 and the base 4, which has better connection stability. Figure 4 As shown, the first adjustment handle 63 comprises a sleeve portion 631 that is sleeved onto the screw rod 61 and circumferentially engages with the screw rod 61, and a handle portion 632 radially disposed with its inner end connected to the sleeve portion 631. In this embodiment, the inner hole shape of the sleeve portion 631 matches the outer contour of the screw rod 61 at the sleeve engagement location, thereby achieving circumferential engagement during the engagement. The handle portion 632 is intended for the user to grasp and actuate. With this structure and because the first adjustment handle 63 is located on the rear side of the seat cushion 3, the rotation angle of the first adjustment handle 63 is generally less than 180°.

[0050] In such Figure 4In the specific scheme, the upper end surface of the base 4 is provided with a slide rail 42, and the lower end of the chuck seat assembly 5 is constructed with a slide groove 50. The slide groove 50 of the chuck seat assembly 5 is sleeved on the slide rail 42 of the base 4. The slide rail 42 and the slide groove 50 are embedded in each other to achieve relative sliding of the chuck seat assembly 5 and the base 4. A linear groove 43 is provided in the middle of the base 4 along the direction of the slide rail 42, and the upper ends of the two side walls of the linear groove 43 form the slide rail 42. The linear through hole 41 is constructed on the bottom plate below the linear groove 43, and a decorative cover 44 is provided on the rear side of the base 4 to close the rear end opening of the linear groove 43. In this scheme, the linear groove 43 is constructed in the middle of the base 4, so that the middle part of the base 4 between the two side slide rails 42 is hollowed out, thereby allowing the slide rail 42 to deform slightly to both sides, and the slide groove 50 on the chuck seat assembly 5 is easier to embed on the slide rail 42. Furthermore, a decorative cover 44 is used to close the rear end opening of the linear groove 43, which not only has an aesthetic effect and avoids safety issues such as hands reaching in from the rear end, but also can open the two side rails 42 so that the rails 42 fit well with the slide groove 50, avoiding gaps and shaking.

[0051] like Figure 3 and 4 As shown, the chuck seat assembly 5 includes a chuck fixing seat 51 and two groups of chuck assemblies 52. The two groups of chuck assemblies 52 are fitted on the two side walls of the chuck fixing seat 51, and the chuck assemblies 52 can rotate relative to the chuck fixing seat 51 along their axis. Positioning structures arranged circumferentially along the rotation axis of the chuck assemblies 52 are constructed on the inner walls of the chuck assemblies 52 and the side walls of the chuck fixing seat 51. Based on this positioning structure, the chuck assemblies 52 can be circumferentially positioned relative to the chuck fixing seat 51. At least two beams 31 are provided at the lower end of the seat cushion 3, respectively fixed to the two groups of chuck assemblies 52. In this seat cushion 3 angle adjustment device, at least two beams 31 are provided at the lower end of the seat cushion 3, respectively fixed to the two groups of chuck assemblies 52. The two groups of chuck assemblies 52 are fitted on the two side walls of the chuck fixing seat 51, and can rotate circumferentially relative to the chuck fixing seat 51 and achieve circumferential positioning through the positioning structure. This solution adopts the side fitting positioning rotation method to replace the solution of setting a toothed surface on the rotating surface recorded in the above-mentioned prior patent. The side operating space of the seat cushion 3 is larger and the angle adjustment is more convenient.

[0052] In a further embodiment, the two sets of chuck assemblies 52 are coaxially threaded through a screw assembly 64 on either side of the chuck mount 51. The ends of the screw assembly 64 act axially on the chuck assemblies 52, causing the chuck assemblies 52 to adhere to the sidewalls of the chuck mount 51. In this embodiment, the screw assembly 64 is used to clamp the chuck assemblies 52, thereby attaching them to the sidewalls of the chuck mount 51. To adjust the reclining angle of the seat cushion 3, simply loosen the screw assembly 64 with a wrench. The chuck assemblies 52 no longer adhere to the sidewalls of the chuck mount 51, allowing for convenient and effortless angle adjustment. Once adjustment is complete and the angle needs to be fixed, simply tighten the screw assembly 64.

[0053] And based on the above solution, the screw assembly 64 is only arranged at the axis of the chuck assembly 52 and the chuck fixing seat 51, and does not affect the setting of the axial positioning structure. Therefore, the connection structure does not affect the positioning strength of the chuck assembly 52 and the chuck fixing seat 51.

[0054] like Figure 3 and 4 As shown, the chuck fixing seat 51 is also detachably connected to a wrench 53 capable of twisting the screw assembly 64. In a specific solution, the upper end of the chuck fixing seat 51 is sunken between the two side walls to form a groove 511, and a magnet is embedded in the groove 511; the wrench 53 is placed in the groove 511 and fixed by the magnet. In this solution, the wrench 53 is magnetically attracted to the chuck fixing seat 51, and the wrench 53 can be easily taken out when the tilt angle of the seat cushion 3 needs to be adjusted. Furthermore, this solution embeds the magnet inside the groove 511. On the basis of magnetically fixing the wrench 53, the groove 511 is used to surround the wrench 53, so that the wrench 53 is not easy to fall off.

[0055] In a specific embodiment, the positioning structure includes a plurality of positioning grooves 520 provided on the inner wall of the chuck assembly 52 and a plurality of positioning protrusions 510 provided on the outer wall of the chuck fixing base 51. The plurality of positioning grooves 520 are arranged circumferentially along the inner wall of the chuck assembly 52, and the plurality of positioning protrusions 510 are arranged circumferentially along the outer wall of the chuck fixing base 51. In this embodiment, circumferential positioning is achieved based on the circumferential arrangement of the plurality of positioning grooves 520 and the plurality of positioning protrusions 510. The positioning grooves 520 and the positioning protrusions 510 are further constructed as linear grooves 43 and linear protrusions extending in the radial direction, respectively. This increases the circumferential positioning strength and ensures that the circumferential positioning is not prone to slipping.

[0056] like Figure 4As shown, the chuck assembly 52 includes a chuck 54 whose inner end surface abuts against the chuck fixing seat 51, and a clamping cover 55 disposed on the outer end of the chuck 54. The positioning structure is constructed on the inner end wall of the chuck 54. The screw assembly 64 passes through the clamping cover 55 and the chuck 54 and presses the clamping cover 55 against the chuck 54. The beam 31 is supported between the clamping cover 55 and the chuck 54. In this solution, when the screw assembly 64 passes through the clamping cover 55 and the chuck 54 and presses them together, the beam 31 is positioned between the clamping cover 55 and the chuck 54, thereby achieving a fixed connection between the seat cushion 3 and the chuck assembly 52. In a specific embodiment, a support portion 541 for supporting the beam 31 is constructed on the outer wall of the chuck 54 or the inner wall of the card cover 55, and a support bracket 542 is constructed on the support portion 541. The card cover 55 is constructed as a U-shaped cover body with an opening facing the chuck 54. The two U-shaped arms of the card cover 55 are located on the upper and lower sides of the support portion 541 and are both supported on the outer end surface of the chuck 54. When the beam 31 is in the support bracket 542, the U-shaped arms of the card cover 55 are positioned to cover the beam 31. In this embodiment, the beam 31 is positioned and supported inside the support bracket 542 of the support portion 541, and when the screw assembly 64 passes through the card cover 55 and the chuck 54 and presses the two together, the U-shaped arms of the card cover 55 are positioned to cover the beam 31, thereby achieving a secure positioning of the beam 31.

[0057] like Figure 1 As shown, the frame 1 includes an outer tube 11, with a seat tube 2 inserted within the outer tube 11 and capable of rising and falling along the outer tube 11. The seat tube 2 in the seat tube height adjustment device is capable of rising and falling relative to the outer tube 11 on the frame 1. The seat cushion 3 is mounted on the upper end of the seat tube 2, thereby enabling longitudinal adjustment of the seat tube 2 and the cushion 3 relative to the frame 1. Furthermore, a seat tube clamp 7 is embedded in the upper end of the outer tube 11, with the seat tube 2 inserted within the clamp 7. The structure and effectiveness of the seat tube clamp 7 can be referenced to the pipe plug described in the prior patent publication number "CN215995495U."

[0058] On this basis Figure 2, 5 and 6, a locking rod 12 is fixedly mounted within the outer tube 11. The locking rod 12 extends along the inner cavity of the outer tube 11 and extends into the seat tube 2. A locking assembly 8 is connected to the seat tube 2 for locking onto the locking rod 12, as well as a control assembly for adjusting the locking assembly 8. The locking assembly 8 comprises an adjustment seat 81 fixed to the lower end of the seat tube 2, a locking plate sleeve 82 disposed within the adjustment seat 81, and a plurality of adjustment washers 83 overlappingly disposed within the locking plate sleeve 82. Each adjustment washer 83 has an axial hole 831 defined therein, and each of the adjustment washers 83 is fitted over the locking rod 12. The inner end of the control assembly is connected to the locking plate sleeve 82 and is used to control the radial angle of the adjustment washers 83 relative to the locking rod 12 within it. When the adjustment washers 83 tilt radially relative to the locking rod 12 and the inner wall of the through-hole of the adjustment washers 83 abuts the locking rod 12, the seat tube 2 is locked to the outer tube 11. When the adjustment shims 83 are positioned radially along the locking rod 12 and the inner wall of the through-hole of the adjustment shims 83 is not in contact with the locking rod 12, the seat tube 2 can be slid and adjusted relative to the outside. This structure, in which the locking rod 12 and the adjustment shims 83 cooperate, not only locates the locking and adjustment area in the center of the seat tube 2, but also eliminates the need to affect the sidewalls of the seat tube 2, thereby preventing deformation of the seat tube 2. Furthermore, the multiple adjustment shims 83 lock with the locking rod 12, ensuring the secure positioning of the seat tube 2.

[0059] Furthermore, a transverse tube section 121 is provided at the lower end of the locking lever 12. The end of the transverse tube section 121 contacts the outer tube 11 and is connected via screws. In this embodiment, the provision of the transverse tube section 121 not only facilitates connection with the outer tube 11, but also defines the lowest position of the seat tube 2, that is, the minimum distance that the seat tube 2 can extend relative to the outer tube 11. Specifically, when the lower end of the adjustment seat 81 contacts the transverse tube section 121, the seat tube 2 cannot move further downward.

[0060] like Figure 5 In the further embodiment shown, the adjustment seat 81 is provided with an adjustment cavity 811, with through-holes 812 formed on the upper and lower end surfaces of the adjustment cavity 811. The locking plate sleeve 82 and the multiple adjustment washers 83 inside it are both embedded in the adjustment cavity 811. The locking rod 12 passes upward from below through the through-hole 812 of the adjustment seat 81 and the axial holes 831 of the multiple adjustment washers 83. In this embodiment, the locking rod 12 passes through the adjustment seat 81 and the multiple adjustment washers 83 inside it, thereby positioning the multiple adjustment washers 83 inside the adjustment seat 81.

[0061] In such Figure 5In the illustrated embodiment, the locking assembly 8 further includes an adjustment compression spring 84 located within the adjustment cavity 811. The adjustment compression spring 84 is sleeved onto the locking rod 12 below the adjustment washer 83, with the upper end of the adjustment compression spring 84 elastically supported against the adjustment washer 83. The adjustment seat 81 axially limits one radial end of the adjustment washer 83, and the inner end of the control assembly is connected to the locking plate sleeve 82 at the other radial end of the adjustment washer 83. When the adjustment washer 83 is supported solely by the elastic force of the adjustment compression spring 84, the adjustment washer 83 tilts radially relative to the locking rod 12, and the inner wall of the through hole 812 of the adjustment washer 83 abuts against the locking rod 12. In this solution, an adjustment spring 84 is further disposed below the adjustment washer 83. The adjustment spring 84 is sleeved onto the locking rod 12 and provides axial support to the adjustment washer 83 above it. However, because the adjustment seat 81 axially limits one radial end of the adjustment washer 83, the adjustment washer 83 will tilt radially relative to the locking rod 12 only when supported by the elastic force of the adjustment spring 84, thereby achieving the locking purpose. To adjust the height of the seat 81 tube 2, the control assembly is operated to drive the locking plate sleeve 82, thereby aligning the adjustment washer 83 within the locking plate sleeve 82 and concentrically aligning the inner wall of the through hole 812 of the adjustment washer 83 with the locking rod 12, thereby achieving unlocking.

[0062] In a specific embodiment, a hook portion 832 is formed at one radial end of the topmost adjustment washer 83. The adjustment seat 81 is provided with a hook opening 813 that communicates with the adjustment cavity 811. The hook portion 832 of the adjustment washer 83 is located within the hook opening 813 of the adjustment seat 81. The adjustment washer 83 is elastically supported by the adjustment compression spring 84. The upper end of the hook portion 832 bears against the top wall of the hook opening 813, causing the adjustment washer 83 to be radially tilted relative to the locking rod 12. In this embodiment, the hook portion 832 is formed at one radial end of the adjustment washer 83 and is restrained by the upper sidewall of the hook opening 813 of the adjustment seat 81. This not only tilts the adjustment washer 83 relative to the locking rod 12, achieving a locking effect, but also prevents the adjustment washer 83 and the surrounding locking plate sleeve 82 from detaching from the adjustment seat 81.

[0063] Figure 5As shown, the locking plate sleeve 82 comprises two sleeves 821, one on each side of the adjusting gasket 83. The front ends of the two sleeves 821 form a sleeve cavity for accommodating the multiple adjusting gaskets 83. The rear ends of the two sleeves 821 are butted together and provided with a hinge hole 822. The sleeves 821 have positioning holes 823 formed on the sidewalls of the sleeve cavity, and at least a portion of the outer edges of the multiple adjusting gaskets 83 extend out of the sleeve cavity through the positioning holes 823. In this embodiment, the locking plate sleeve 82 is formed by butting two sleeves 821 together. The front sleeve cavity is used to accommodate the adjusting gasket 83, and the rear hinge hole 822 is used to connect to the end of the control assembly. The outer edges of the multiple adjusting gaskets 83 partially extend out of the positioning holes 823, allowing the multiple adjusting gaskets 83 to be engaged within the positioning holes 823. Therefore, operating the locking plate sleeve 82 can synchronously control the angle of the inner adjusting gasket 83.

[0064] like Figure 5 and 6 As shown, the seat tube 2 is fixedly mounted with a base 4 at its upper end. The control assembly includes a second adjustment handle 91 hingedly connected to the base 4, and an adjustment link 92 located within the seat tube 2. The upper end of the adjustment link 92 is connected to the second adjustment handle 91, and the lower end is connected to the locking plate sleeve 82. In a specific embodiment, an adjustment U-shaped seat 93 is provided at both the upper and lower ends of the adjustment link 92. The upper adjustment U-shaped seat 93 is hingedly connected to the rotating shaft of the second adjustment handle 91 via a connecting piece 94, while the lower adjustment U-shaped seat 93 is hingedly connected to the locking plate sleeve 82. Based on this embodiment, when the second adjustment handle 91 is operated, the second adjustment handle 91 presses down the connecting piece 94 and the adjustment link 92 along its hinged end, and the lower end of the adjustment link 92 presses down the locking plate sleeve 82 via the U-shaped seat. The above solution states that when the adjustment washer 83 is supported only by the elastic force of the adjustment compression spring 84, the adjustment washer 83 is radially tilted relative to the locking rod 12, and the inner wall of the through hole 812 of the adjustment washer 83 abuts the locking rod 12. Here, the second adjustment handle 91 presses down the adjustment washer 83 via the adjustment link 92, thereby adjusting the adjustment washer 83 from the tilted state to the straightened state, thereby unlocking the lock.

[0065] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A fitness bike comprising a frame (1), a seat tube (2) arranged on the frame (1), and a seat cushion (3) arranged on the upper end of the seat tube (2); characterized in that: The frame (1) includes an outer tube (11), a seat tube (2) is inserted into the outer tube (11) and is capable of sliding up and down along the outer tube (11); a base (4) is fixed to the upper end of the seat tube (2), a chuck seat assembly (5) is provided on the base (4), a lower end of the chuck seat assembly (5) is slidably provided on the base (4) in a forward and backward manner, and a seat cushion (3) is provided on the chuck seat assembly (5); The base (4) is provided with linear through holes (41) arranged in the front-to-back direction. The chuck seat assembly (5) and the base (4) are connected via a locking assembly. The locking assembly comprises a screw (61), a nut (62) and a first adjustment handle (63). After the screw (61) passes through the linear through holes (41) on the chuck seat assembly (5) and the base (4), the nut (62) is connected to the end of the screw (61); the first adjustment handle (63) is sleeved on the screw (61) and circumferentially linked with the screw (61), and the nut (62) is circumferentially positioned relative to the base (4); The chuck seat assembly (5) comprises a chuck fixing seat (51) and two groups of chuck assemblies (52); the two groups of chuck assemblies (52) are fitted on the two side walls of the chuck fixing seat (51), and the chuck assemblies (52) can rotate relative to the chuck fixing seat (51) along their axis; a positioning structure arranged circumferentially along the rotation axis of the chuck assembly (52) is constructed on the inner wall of the chuck assembly (52) and the side wall of the chuck fixing seat (51); the chuck assembly (52) can be circumferentially positioned with the chuck fixing seat (51) based on the positioning structure, and at least two beams (31) are provided at the lower end of the seat cushion (3) and are respectively fixed on the two groups of chuck assemblies (52); A locking rod (12) is fixedly provided inside the outer tube (11), and the locking rod (12) is provided along the extension direction of the inner cavity of the outer tube (11); a locking assembly (8) for locking on the locking rod (12) and a control assembly for adjusting the locking assembly (8) are connected to the seat tube (2); the locking assembly (8) comprises an adjustment seat (81) fixedly provided at the lower end of the seat tube (2), a locking plate sleeve (82) provided in the adjustment seat (81), and a plurality of adjustment washers (83) overlapped and provided inside the locking plate sleeve (82); an axial hole (831) is provided in the adjustment washers (83), and the plurality of adjustment washers (83) are provided in the adjustment washers (83). The washers (83) are sleeved on the locking rod (12); the inner end of the control assembly is connected to the locking plate sleeve (82) and is used to control the radial angle of the adjustment washers (83) relative to the inner locking rod (12); when the adjustment washers (83) are radially inclined relative to the locking rod (12), the inner wall of the through hole (812) of the adjustment washers (83) abuts against the locking rod (12), and the seat tube (2) and the outer tube (11) are locked; when the adjustment washers (83) are radially arranged along the locking rod (12), the inner wall of the through hole (812) of the adjustment washers (83) does not contact the locking rod (12), and the seat tube (2) can be slidably adjusted relative to the outer tube; The adjusting seat (81) is provided with an adjusting cavity (811), and the upper and lower end surfaces of the adjusting cavity (811) are constructed with through holes (812); the locking plate bundle (82) and the multiple adjusting washers (83) inside thereof are both embedded in the adjusting cavity (811), and the locking rod (12) passes through the through hole (812) of the adjusting seat (81) and the axial holes (831) of the multiple adjusting washers (83) from the bottom to the top; the locking assembly (8) also includes an adjusting compression spring (84) in the adjusting cavity (811), the adjusting compression spring (84) is sleeved on the locking rod (12) below the adjusting washers (83), and the upper end of the adjusting compression spring (84) is elastically supported on the adjusting washers (83); the adjusting seat (81) axially limits the radial end of the adjusting washers (83), and the inner end of the control assembly is connected to the adjusting washers ( 83) on the locking plate bundle sleeve (82) at the radial other end of the adjusting seat (81); when the adjusting gasket (83) is only supported by the elastic support of the adjusting pressure spring (84), the adjusting gasket (83) is radially inclined relative to the locking rod (12), and the inner wall of the through hole (812) of the adjusting gasket (83) abuts against the locking rod (12); a hook portion (832) is constructed at the radial end of the uppermost adjusting gasket (83), and a hook opening (813) communicating with the adjusting cavity (811) is provided on the adjusting seat (81), and the hook portion (832) of the adjusting gasket (83) is located inside the hook opening (813) of the adjusting seat (81); the adjusting gasket (83) is supported by the elastic support of the adjusting pressure spring (84), and the upper end of the hook portion (832) supports the top wall of the hook opening (813), and the adjusting gasket (83) is radially inclined relative to the locking rod (12).

2. The fitness vehicle according to claim 1, wherein: The upper end surface of the base (4) is provided with a slide rail (42), and the lower end of the chuck seat assembly (5) is constructed with a slide groove (50); the slide groove (50) of the chuck seat assembly (5) is sleeved on the slide rail (42) of the base (4); a linear groove (43) is provided in the middle of the base (4) along the direction of the slide rail (42), and the upper ends of the two side walls of the linear groove (43) form the slide rail (42); the linear through hole (41) is constructed on the bottom plate below the linear groove (43), and a decorative cover (44) is provided on the rear side of the base (4) to close the rear end opening of the linear groove (43).

3. The fitness vehicle according to claim 1, characterized in that: The first adjustment handle (63) comprises a sleeve portion (631) sleeved on the screw rod (61) and circumferentially linked to the screw rod (61), and a handle portion (632) arranged radially and having its inner end connected to the sleeve portion (631).

4. The fitness vehicle according to claim 1, characterized in that: The two groups of chuck assemblies (52) are coaxially passed through the two sides of the chuck fixing seat (51) through the screw assembly (64), and the end of the screw assembly (64) acts on the chuck assembly (52) along its axial direction, so that the chuck assembly (52) is fitted on the side wall of the chuck fixing seat (51); the chuck fixing seat (51) is also detachably connected to a wrench (53) capable of twisting the screw assembly (64); the upper end of the chuck fixing seat (51) is sunken between the two side walls to form a groove (511), and a magnet is embedded in the groove (511); the wrench (53) is placed in the groove (511) and is adsorbed and fixed by the magnet.

5. The fitness vehicle according to claim 1, characterized in that: The positioning structure comprises a plurality of positioning grooves (520) provided on the inner wall of the chuck assembly (52), and a plurality of positioning protrusions (510) provided on the outer wall of the chuck fixing seat (51); the plurality of positioning grooves (520) are arranged circumferentially along the inner wall of the chuck assembly (52), and the plurality of positioning protrusions (510) are arranged circumferentially along the outer wall of the chuck fixing seat (51); the positioning grooves (520) and the positioning protrusions (510) are respectively constructed as linear grooves (43) and linear protrusions extending in a radial direction.

6. The fitness vehicle according to claim 5, characterized in that: The chuck assembly (52) includes a chuck (54) whose inner end surface is in contact with the chuck fixing seat (51), and a card cover (55) provided on the outer end of the chuck (54); the positioning structure is constructed on the inner end wall of the chuck (54); the screw assembly (64) passes through the card cover (55) and the chuck (54) and presses the card cover (55) against the chuck (54); the beam (31) is supported between the card cover (55) and the chuck (54); the outer wall of the chuck (54) or the card cover (55) 5) is constructed on the inner side wall thereof with a support portion (541) for supporting the beam (31), and a support bracket (542) is constructed on the support portion (541); the card cover (55) is constructed as a U-shaped cover body with an opening toward the chuck (54), and the two U-shaped arms of the card cover (55) are located on the upper and lower sides of the support portion (541) and are both supported on the outer end surface of the chuck (54); when the beam (31) is in the support bracket (542), the U-shaped arms of the card cover (55) are positioned to cover the beam (31).

7. The fitness vehicle according to claim 1, characterized in that: The locking plate bundle sleeve (82) comprises two sleeves (821) located on both sides of the adjusting gasket (83), the front ends of the two sleeves (821) forming a sleeve cavity for accommodating multiple adjusting gaskets (83), and the rear ends of the two sleeves (821) are butted and provided with a hinge hole (822); the sleeve (821) is provided with a positioning hole (823) on the side wall of the sleeve cavity, and at least a portion of the outer edge of the multiple adjusting gaskets (83) extends out of the sleeve cavity from the positioning hole (823).

8. The fitness vehicle according to claim 1, characterized in that: The control assembly comprises a second adjustment handle (91) hinged on the base (4), and an adjustment connecting rod (92) located inside the seat tube (2), wherein the upper end of the adjustment connecting rod (92) is connected to the second adjustment handle (91), and the lower end is connected to the locking plate sleeve (82); an adjustment U-shaped seat (93) is provided at both the upper and lower ends of the adjustment connecting rod (92); the upper adjustment U-shaped seat (93) is hinged to the rotating shaft of the second adjustment handle (91) through a connecting plate (94), and the lower adjustment U-shaped seat (93) is hinged to the locking plate sleeve (82).

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