Chair back assembly and multi-functional exercise chair

Abstract

The utility model discloses a chair back assembly and multi -functional body -building chair are provided on the chair face subassembly, including resistance unit, third pole department, rotation unit and first back pole, and third pole department is close to the chair face subassembly setting, and rotation unit sets up on third pole department, and the one end of first back pole is close to the chair face subassembly and is connected with third pole department through rotation unit, and the one end of first back pole is connected resistance unit away from the chair face subassembly, and first back pole sets up as telescopic structure and can rotate with third pole department as the axle. The utility model discloses a chair back assembly, and the one end of first back pole is connected resistance unit away from the chair face subassembly, and first back pole sets up as telescopic structure and can rotate with third pole department as the axle, to make the height and angle of resistance unit adjustable, to meet the adjusting demand of different height body long user, and the overall height of chair back assembly can reduce simultaneously, realizes the folding storage effect of miniaturization.

Description

Technical Field

[0001] This utility model relates to the field of exercise equipment, and in particular to a chair back assembly and a multifunctional fitness chair containing the chair back assembly. Background Technology

[0002] A fitness chair is a type of exercise equipment used for strength training and fitness exercises, widely used in gyms and home gyms. Fitness chairs typically have a backrest assembly for back support, helping users safely and effectively perform muscle exercises such as chest presses, shoulder presses, and back stretches.

[0003] However, the integration of the resistance system on the backrest assembly is currently low. The resistance system is placed on the entire backrest assembly or chair, which limits the range of adjustment of the vertical height of the backrest assembly and the folding angle of the backrest. It cannot meet the adjustment needs of users of different heights and lengths, and it is not easy to achieve miniaturized folding and storage. It has the disadvantages of low applicability and poor storage effect. Utility Model Content

[0004] The purpose of this invention is to provide a chair back assembly and a multi-functional fitness chair containing the chair back assembly. The chair back features horizontally arranged resistance units, which lowers the overall height of the chair back assembly, meeting various adjustment needs and improving folding and storage efficiency. The specific technical solution is as follows:

[0005] A chair back assembly is disposed on a chair surface assembly, including a resistance unit, a third rod, a rotating unit, and a first back rod. The third rod is disposed close to the chair surface assembly, and the rotating unit is disposed on the third rod. The end of the first back rod close to the chair surface assembly is connected to the third rod via the rotating unit, and the end of the first back rod away from the chair surface assembly is connected to the resistance unit. The first back rod is configured as a telescopic structure and can rotate around the third rod as an axis.

[0006] Furthermore, the first back bar includes a fourth spring pin, and a first base and a first extension that are sleeved together. The fourth spring pin is disposed on the first base, and a plurality of limiting holes are provided at intervals on the first extension. The fourth spring pin can pass through the first base and into different limiting holes of the first extension.

[0007] Furthermore, it also includes a second back bar, which is disposed opposite to the first back bar at both ends of the third bar. The second back bar includes a second base part and a second extension part that are sleeved together.

[0008] Furthermore, the resistance unit includes a first resistance assembly, which includes a first fixed ring, a first steering wheel, a first reversing wheel, and a first rope. The first fixed ring and the first reversing wheel are located on the side near the second extension, and the first steering wheel is located on the side near the first extension. One end of the first rope is connected to the first fixed ring, and the other end of the first rope passes through the first steering wheel and then exits the chair back assembly through the first reversing wheel, so that the first rope is folded laterally.

[0009] Furthermore, the first steering wheel is disposed on the side of the first extension facing the second extension, and the first directional wheel is disposed on the rear side of the second extension.

[0010] Furthermore, the pulley axis of the first directional wheel is parallel to the axis of the second back rod, and the pulley axis of the first steering wheel is perpendicular to the pulley axis of the first directional wheel.

[0011] Furthermore, it also includes a push rod, the two ends of which are connected to the first extension and the second extension, respectively. A first fixing ring is disposed at one end of the push rod near the second extension so that the first fixing ring corresponds to the pulley groove of the first steering wheel.

[0012] Furthermore, the resistance unit also includes a second resistance component, which is symmetrically arranged with the first resistance component. The second resistance unit includes a second fixed ring, a second steering wheel, a second reversing wheel, and a second rope. The second fixed ring and the second reversing wheel are located on the side near the first extension, and the second steering wheel is located on the side near the second extension. One end of the second rope is connected to the second fixed ring, and the other end of the second rope passes through the second steering wheel and then exits the chair back assembly through the second reversing wheel, so that the second rope is folded laterally.

[0013] Furthermore, the rotating unit includes a chuck assembly and an adjusting assembly connected to each other. The two sides of the chuck assembly are respectively connected to a first back rod and a third rod. The adjusting assembly can drive the chuck assembly to lock or disengage. The chuck assembly includes a first chuck and a second chuck arranged opposite each other. The first chuck is fixed on the third rod, and the second chuck is fixed on the first back rod. The first chuck and the second chuck are provided with a locking structure opposite each other. The adjusting assembly includes a rotating shaft, a bushing, an adjusting rod, a stop pin, and a washer. The outer wall of the bushing is connected to the first back rod, and the two ends of the bushing are respectively connected to the second chuck and the adjusting rod. A through hole is provided in the middle of the first chuck and the second chuck. One side of the rotating shaft passes through the through hole, and the outer wall of the rotating shaft is fixedly connected to the first chuck. The other side of the rotating shaft passes through the bushing. One end of the adjusting rod passes through the bushing into the rotating shaft, and the outer wall of the adjusting rod is threadedly connected to the inner wall of the rotating shaft. A through hole is provided at the end of the adjusting rod inserted into the rotating shaft. The stop pin passes through the through hole, and the washer is provided between the bushing and the adjusting rod.

[0014] A multifunctional fitness chair includes the backrest assembly described above.

[0015] The chair back assembly of this utility model, and the multifunctional fitness chair containing the chair back assembly, have the following advantages:

[0016] 1. The end of the first backrest near the seat assembly is connected to the third rod via a rotating unit, and the end of the first backrest away from the seat assembly is connected to the resistance unit. The first backrest is designed as a telescopic structure and can rotate around the third rod as an axis, so that the height and angle of the resistance unit can be adjusted to meet the adjustment needs of users of different heights and body lengths. At the same time, the overall height of the backrest assembly can be reduced, achieving a miniaturized folding and storage effect.

[0017] 2. With the first rope having sufficient length, the stretching stroke of the first rope is concentrated laterally on the upper side of the chair back assembly, occupying only a small portion of the vertical space of the chair back assembly. Combined with the telescopic structure of the first and second back bars, the height of the resistance unit on the chair back assembly can be adjusted. In addition, the resistance unit can be adjusted to the lowest height and then folded for storage, which can further realize the miniaturization of the fitness chair.

[0018] 3. The pulley axis of the first deflector is parallel to the axis of the first back bar to prevent the first rope from slipping off the first deflector vertically. The pulley axis of the first steering wheel is perpendicular to the pulley axis of the first deflector. This reduces the force that would cause the first rope to slip off the first steering wheel or the first deflector when the first rope is stretched at different angles, thus preventing injury to the human body caused by the first rope slipping off the first steering wheel or the first deflector and improving the stability of the resistance unit and the safety of the multi-functional fitness chair. Attached Figure Description

[0019] Figure 1 This is a first schematic diagram of the unfolded state of the multifunctional fitness chair of this utility model.

[0020] Figure 2 This is an exploded view of the seat assembly, legs, and folding assembly of the multifunctional fitness chair of this utility model.

[0021] Figure 3 This is a schematic diagram of the stabilizer in the multifunctional fitness chair of this utility model.

[0022] Figure 4 This is a second schematic diagram of the multifunctional fitness chair of this utility model in its unfolded state.

[0023] Figure 5 This is a cross-sectional view of the stabilizer in the multifunctional fitness chair of this utility model.

[0024] Figure 6 for Figure 2 The combined state diagram.

[0025] Figure 7This is a side view of the seat assembly, legs, and folding assembly of the multifunctional fitness chair of this utility model.

[0026] Figure 8 This is a cross-sectional view of the fourth support part in the multifunctional fitness chair of this utility model.

[0027] Figure 9 This is the third schematic diagram showing the multifunctional fitness chair of this utility model in its unfolded state.

[0028] Figure 10 This is a schematic diagram of the resistance unit in the multifunctional fitness chair of this utility model.

[0029] Figure 11 This is a cross-sectional view of the rotating unit in the multifunctional fitness chair of this utility model.

[0030] Figure 12 This is a three-dimensional schematic diagram of the folding mode of the multifunctional fitness chair of this utility model.

[0031] Figure 13 This is a side view of the folding mode of the multifunctional fitness chair of this utility model.

[0032] Figure 14 This is a schematic diagram of another embodiment of the resistance unit in the multifunctional fitness chair of this utility model.

[0033] Figure 15 for Figure 14 A diagram illustrating the folding pattern. Detailed Implementation

[0034] To better understand the purpose, structure, and function of this utility model, the backrest assembly and the multifunctional fitness chair containing the backrest assembly of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 15 As shown, the multi-functional fitness chair includes a seat assembly 100, chair legs 200, a folding assembly 300, a footrest 400, a backrest assembly 500, and a support plate 600. The unfolded state of the multi-functional fitness chair is similar to that of a common chair and can be used for exercise and daily use. When a person sits on the multi-functional fitness chair in a normal sitting posture, the side of the multi-functional fitness chair closest to the support plate 600 is defined as the front side of the multi-functional fitness chair, the side closest to the backrest is defined as the rear side of the multi-functional fitness chair, the side closest to the left hand of the person is defined as the left side of the multi-functional fitness chair, and the side closest to the right hand of the person is defined as the right side of the multi-functional fitness chair. The line connecting the front and rear sides is defined as the longitudinal direction, the line connecting the left and right sides is defined as the transverse direction, and the line connecting the top and bottom sides is defined as the vertical direction.

[0036] The overall structure of the multi-functional fitness chair is symmetrically arranged in the horizontal direction. The chair legs 200 are movably connected to the seat assembly 100 via folding components 300, and the chair legs 200 are located on the lower side of the seat assembly 100. The backrest assembly 500 is movably connected to the upper side of the seat assembly 100 relative to the chair legs 200. Resistance units 501 and pull ropes are installed on the backrest assembly 500. The stabilizer 400 is adjustablely mounted on the chair legs 200. The stabilizer 400 can be unfolded for Pilates stepping exercises, or it can be adjusted and fixedly stored on the chair legs 200. Furthermore, the chair legs 200 and the backrest assembly 500 are aligned longitudinally towards the chair... The seat assembly 100 is folded, allowing it to switch between various exercise modes or a seating mode when unfolded. Exercise modes include Pilates movements such as chest press, flyes, and rowing. The seating mode is used as a regular chair. Apart from the seat assembly 100, backrest assembly 500, and legs 200, the overall external structure has no other unnecessary structures that affect the user's posture. In the folded mode, the backrest assembly 500, legs 200, and stabilizer 400 fold towards the plane of the seat assembly 100, placing these structures on the same plane, reducing the footprint and giving the multi-functional fitness chair the advantages of being compact and easy to store. This "same plane" includes both completely being on the same plane and being parallel to each other against the same plane.

[0037] Figure 2 As shown, the seat assembly 100 of the multi-functional fitness chair includes a seat support 101 and a seat cushion 102. The seat support 101 has a square frame structure, including a first frame portion 103 on the left side, a third frame portion 105 on the front side, a second frame portion 104 on the right side, and a fourth frame portion 106 on the rear side, which are connected in sequence. The seat support 101 is used to connect the chair legs 200 and the backrest assembly 500, and the seat cushion 102 is provided on the upper side of the seat support 101 to increase the comfort of use.

[0038] The legs 200 of the multi-functional fitness chair include four support parts: a first support part 201 and a second support part 202 arranged opposite each other on the front side (also defined as front support parts), and a third support part 203 and a fourth support part 204 arranged opposite each other on the rear side (defined as rear support parts). The first support part 201 and the third support part 203 are located on the left side of the multi-functional fitness chair, and the second support part 202 and the fourth support part 204 are located on the right side of the multi-functional fitness chair. The four support parts are long tubular structures. The upper ends of the first support part 201 and the third support part 203 are rotatably connected to the first frame part 103, and the upper ends of the second support part 202 and the fourth support part 204 are rotatably connected to the second frame part 104. This allows the legs 200 to be folded towards the seat support 101.

[0039] The backrest assembly 500 can rotate around the third rod portion 502 on the rotating unit 503, and the chair legs 200 can rotate around the third pivot portion 307 and the seventh pivot portion 311 on the folding assembly 300. The third rod portion has a first axis, and the third pivot portion 307 and the seventh pivot portion 311 form a second axis. Both the first axis and the second axis are set close to the plane where the seat assembly 100 is located. The purpose of this structure is that when the backrest assembly 500 and the chair legs 200 are rotated to a position parallel to the plane where the seat assembly 100 is located, their respective axes of rotation are close to the seat assembly 100, so that the backrest assembly 500 and the chair legs 200 are located in a position close to the seat assembly 100, thereby reducing the longitudinal thickness of the multi-functional fitness chair in the folded state, which is conducive to miniaturization and storage and overall coordination and aesthetics.

[0040] Furthermore, a third pivot 307 is disposed on the first frame 103, and a seventh pivot 311 is disposed on the third frame 105. Thus, the second axis is located between the first frame and the second frame. The backrest assembly includes an extension 107, with its two ends connected to the fourth frame 106 and the third rod 502, respectively. One end of the extension 107 connected to the third rod 502 extends vertically away from the second axis, so that the first axis and the second axis are located on the upper and lower sides of the plane where the seat assembly 100 is located, respectively. The purpose of this structure is to make the first axis and the second axis close to the seat assembly 100 while avoiding the intersection between the chair legs 200 and the backrest assembly 500 folded around the corresponding axes, so that both can be folded to the same angle as the seat assembly 100, making the folding of the multifunctional fitness chair more compact and aesthetically pleasing.

[0041] Preferably, the second axis is located on the side of the seat assembly 100 away from the backrest assembly 500, that is, close to the first frame portion 103, so that the chair legs 200 overlap with the seat assembly 100 as much as possible in the vertical direction. At the same time, the backrest assembly 500 is set as a telescopic structure in the direction relative to the seat assembly 100, thereby reducing the height of the backrest assembly 500 and thus reducing the overall height of the folded multi-functional fitness chair. On the one hand, this facilitates the miniaturization and storage of the multi-functional fitness chair. On the other hand, after the height of the backrest assembly 500 is reduced, it folds towards the direction of the chair legs 200, forming sufficient space above the rear support legs. Combined with the tray set on the rear support portion, the user can stand on the tray and use the resistance unit on the backrest assembly to perform exercises such as flyes and shoulder presses, increasing the usage scenarios and exercise modes.

[0042] Specifically, such as Figure 3 and Figure 4As shown, the stabilizer 400 has an overall I-shaped structure, including a first rod 401 and a foot pedal 402 arranged opposite each other, a second rod 403 connecting the first rod 401 and the foot pedal 402, and a first spring (not shown in the figure). The two ends of the first rod 401 are pivotally connected to the lower side of the third rod 502 and the lower side of the fourth rod, respectively. The two ends of the second rod 403 are connected to the middle of the first rod 401 and the middle of the foot pedal 402, respectively, so that the second rod 403 drives the foot pedal 402 to rotate around the first rod 401 as an axis. Multiple sets of rings are arranged opposite each other on the upper side of 403 and the lower side of the extension 107 of the seat support 101, which are used to connect the hooks at both ends of the first spring to the third base 405 and the extension 107 of the second rod 403, respectively. One end of the third base 405 is fixedly connected to the first rod, and multiple fixing parts are arranged at intervals on the other end of the third base 405. The fixing parts are connected to the first spring, so that the second rod 403 is pulled by the first spring toward the seat support 101. One or more first springs can be set according to actual needs to adjust the resistance value during movement.

[0043] The second rod 403 in this invention is designed as a telescopic structure, allowing the distance between the footrest 402 and the first rod 401 to be adjustable. The purpose of this structure is that when using the multi-functional fitness chair for Pilates exercises, after adjusting the sitting posture, the feet rest on the footrest 402. Therefore, it is necessary to increase the length of the second rod 403, extending the footrest 402 forward beyond the positions of the first and second supports 201. After the exercise, the length of the second rod 403 can be shortened, allowing the footrest 402 to extend backward and be positioned between the first and third supports 201. This prevents the footrest 402 from colliding with the body and causing injury, improving usability and safety while also enhancing the overall appearance and aesthetics of the fitness chair.

[0044] Furthermore, the second rod portion 403 includes a third extension portion 404 and a third base portion 405 that are nested together, as well as a third spring pin 406. A plurality of positioning holes are provided at intervals on the third extension portion 404, and a spring is provided inside the third spring pin 406, so that the third spring pin 406 is set on the third base portion 405 and abuts against the line connecting the plurality of positioning holes. By adjusting the third spring pin 406, it can be made to pass through the third base portion 405 and onto different positioning holes in the third extension portion 404, thereby limiting the relative position of the third extension portion 404 and the third base portion 405, so as to adjust the second rod portion 403 to the required length.

[0045] Preferably, the foot pedal 402 includes a first foot pedal 407 and a second foot pedal 408 arranged opposite to each other. The first foot pedal 407 corresponds to the left foot of the human body, and the second foot pedal 408 corresponds to the right foot of the human body. Furthermore, the number of second rods 403 is set to two. The first foot pedal 407 and the second foot pedal 408 are respectively connected to the first rod 401 through their corresponding second rods 403. This split-type foot pedal 402 allows the first foot pedal 407 and the second foot pedal 408 to be located at different height positions, thereby realizing the movement mode of alternating up and down pedaling of the human body's two feet.

[0046] Furthermore, such as Figure 5 As shown, the split-type foot pedal 402 can form a complete structure for a training mode of synchronous pedaling with both feet and is easy to store. Specifically, the foot pedal 402 also includes a connecting tube 409, a stop 410, and a pin 411. A second spring 412 is installed inside the connecting tube 409. A cap 413 is provided at one end of the connecting tube 409. The end of the connecting tube 409 without the cap 413 is inserted into the second pedal 408 from the right side and further inserted into the first pedal 407. A stop 410 is provided inside the first pedal 407 to allow the second spring 412 to be inserted into the first pedal 407. The two ends of the second spring 412 abut against the cover 413 and the stop part 410 respectively. The pin 411 passes through the second step part 408 and the string tube 409, as well as the first step part 407 or the second step part 408, to confine the string tube 409 within the first step part 407 and the second step part 408. That is, the foot pedal part 402 is connected as a whole structure and can move up and down. When it is necessary to remove the string tube 409, after pulling out the pin 411, the second spring 412 can push the string tube 409 out of the second step part 408, thereby unlocking the first step part 407 and the second step part 408. It can be understood that the insertion direction of the string tube 409 into the foot pedal part 402 and the setting position of the pin 411 correspond to the position relationship of the stop part 410. Therefore, the string tube 409 can also be inserted from the left side of the first step part 407, and the setting positions of the pin 411 and the stop part 410 can be adjusted accordingly. This will not be elaborated here.

[0047] It should be noted that the split foot pedal 402 is only a preferred embodiment. Those skilled in the art can set the structure of the second rod 403 and the foot pedal 402 according to actual needs. For example, only one second rod 403 is set, and one end of the second rod 403 is connected to the integrated foot pedal 402. As long as the foot pedal 402 can move up and down and the second rod 403 can be extended and retracted, it is acceptable.

[0048] Preferred, such as Figure 4As shown, the stabilizer 400 also includes a fixing rod 205. The two ends of the fixing rod 205 are connected to the third support 203 and the fourth support 204, respectively. The fixing rod 205 is positioned on the upper side relative to the first rod 401, closer to the seat assembly 100. A retaining ring 206 is provided on the side of the fixing rod 205 facing the second rod 403. The retaining ring has an opening facing the second rod 403. When the second rod 403 can be rotated upwards with the first rod 401 as the axis to the retaining ring 206, the second rod 403 can be lifted upwards and inserted into the retaining ring through an interference fit. This fixes the second rod 403 to the fixing rod 205, preventing displacement of the second rod 403 and the foot pedal 402 when not in use, and improving the stability and aesthetics of the storage mode. Of course, those skilled in the art can set up a magnetic attraction structure or a locking structure between the fixed rod 205 and the second rod 403 as needed, as long as it can achieve the effect of fixing the second rod 403 to the fixed rod 205.

[0049] It should be noted that the seat cushion 102 of this multifunctional fitness chair is mounted on the seat support 101. By adjusting the second rod 403, the footrest 402 is moved towards the first rod 401, causing the second rod 403 to be in a shortened state. The length of the second rod 403 can be shortened to no greater than the length of the third support 203. Then, the second rod 403 is fixed to the fixing rod 205. This allows the footrest 402 and the second rod 403 to be fixed relative to the seat cushion 102 on the lower side of the seat support 101, switching to seat mode. At this time, the footrest 402 and the second rod 403 are all within the coverage area of ​​the vertical (directly above) projection of the seat cushion 102. Figure 1 As shown, this ensures that the stabilizer 400 does not protrude beyond the outer contours of the seat assembly 100 and the chair legs 200, preventing the protruding stabilizer 400 from affecting the normal sitting posture of the human body and improving storage efficiency and aesthetics.

[0050] It needs to be further emphasized that, such as Figure 1As shown, the rearward-facing sides of the third support portion 203 and the fourth support portion 204 are defined as the outer sidewall 208, and the frontward-facing sides of the third support portion 203 and the fourth support portion 204 are defined as the inner sidewall 207. The fixing rod 205 is positioned close to the outer sidewall 208 of the third support portion 203 and the fourth support portion 204, and the first rod portion 401 is positioned close to the inner sidewall 207 of the third support portion 203 and the fourth support portion 204. Thus, after the second rod portion 403 is fixed to the fixing rod 205, the second rod portion 403 and the foot pedal portion 402 are all located within the coverage area of ​​the lateral projection of the third support portion 203 or the fourth support portion 204. Therefore, in the storage mode, the second rod portion 403, the foot pedal portion 402, the third support portion 203, and the fourth support portion 204 are all on the same plane, without creating a protruding structure, achieving flat storage and further improving the space utilization rate in the storage mode.

[0051] Furthermore, such as Figure 4 As shown, the support plate 600 is movably connected between the first support part 201 and the second support part 202, and the first support part 201 and the second support part 202 are set on the side closer to the ground. It is used for the human foot to step on during exercise mode to support the foot, and at the same time apply downward pressure to the fitness chair to keep the overall stability of the fitness chair. Specifically, the support plate 600 is connected to the support part through a quick-release pin 601. The quick-release pin 601 includes a pin part that connects the chair leg 200 and the support plate 600. An adjustment bolt 602 is set at one end of the pin part near the support plate 600, and an axle part is set at one end of the pin part near the chair leg 200. An adjustment handle is set on the axle part. The tightness of the pin part can be adjusted by rotating the adjustment handle. Understandably, by setting the quick-release pin 601, the tray 600 can be quickly removed from the first support 201 and the second support 202. Correspondingly, the tray 600 can be movably connected between the third support 203 and the fourth support 204, with the third support 203 and the fourth support 204 on the side closest to the ground. This adapts to other movement modes formed by the chair back rotating downwards, allowing for efficient use of the tray 600 to support the feet. At the same time, it applies downward pressure to the fitness chair after stepping on it, maintaining the overall stability of the fitness chair. In addition, the tray 600 can be removed in the storage mode to improve the storage effect.

[0052] like Figure 6 and Figure 7 As shown, a folding assembly 300 is provided below the seat cushion 102. The folding assembly 300 includes a first link structure 301 and a second link structure 302 symmetrically arranged on the left and right sides. Therefore, the following description will mainly focus on the structure of one side, while the other side can be symmetrically arranged.

[0053] Specifically, the first connecting rod structure 301 includes a first frame portion 103, a first support portion 201, a third support portion 203, a first inner connecting arm 303, and a first outer connecting arm 304. A first pivot portion 305 and a second pivot portion 306 are disposed opposite each other on the first frame portion 103. The first support portion 201 and the third support portion 203 are movably connected to the first pivot portion 305. One end of the first inner connecting arm 303 is movably connected to the second pivot portion 306. A fourth pivot portion 308 is disposed on the first support portion 201. One end of the first outer connecting arm 304 is connected to the fourth pivot portion 308. A reciprocating third support portion 203 is disposed on the third pivot portion 307. The other end of the first inner connecting arm 303 and the other end of the first outer connecting arm 304 are movably connected to the third pivot portion 307. The distance between the first pivot portion 305 and the second pivot portion 306 plus the distance between the second pivot portion 306 and the third pivot portion 307... The distance between them is equal to the distance between the first pivot 305 and the fourth pivot 308 plus the distance between the fourth pivot 308 and the third pivot 307. The purpose of setting the above two distances to be of equal length is that when the distance between the first pivot 305 and the third pivot 307 is at its maximum value by rotating the four-bar linkage structure, the above two distances can also be at their maximum value and are equal. That is, the first support 201, the third support 203, the first inner connecting arm 303, and the first outer connecting arm 304 can be on a straight line on the same plane, thereby achieving a flat storage effect. In addition, the aforementioned fixing rod 205 is set close to the outer wall 208 of the third support 203 and the fourth support 204, and the first rod 401 is set close to the inner wall 207 of the third support 203 and the fourth support 204, so that the chair legs 200 and the stabilizer 400 are stored on the same plane, improving the miniaturization effect of the storage mode.

[0054] In this design, the first inner connecting arm 303, the first frame portion 103, and the third support portion 203 form a stable triangular structure. Simultaneously, the first outer connecting arm 304, the first support portion 201, and the third support portion 203 also form a stable triangular structure. In the second linkage structure 302, the second inner connecting arm 309, the second frame portion 104, and the fourth support portion 204 form a stable triangular structure. Similarly, the second outer connecting arm 310, the second support portion 202, and the fourth support portion 204 also form a stable triangular structure. This ensures that the seat support 101 is stably mounted on the chair legs 200, allowing the unfolded fitness chair to be stably supported on the ground. Furthermore, the first frame portion 103 and the second frame portion 104 in the folding assembly 300 are relatively fixed. Through the rotation of the third pivot portion 307 and the corresponding seventh pivot portion 311 in the second linkage structure 302, the chair legs 200 are driven to quickly fold towards the seat assembly 100 to form a storage mode, achieving convenient and efficient operation and miniaturization of the overall structure.

[0055] Furthermore, the distance between the first pivot 305 and the fourth pivot 308 is equal to the distance between the third pivot 307 and the second pivot 306, and the distance between the first pivot 305 and the second pivot 306 is equal to the distance between the third pivot 307 and the fourth pivot 308. That is, the first connecting rod structure 301 is set as a parallelogram structure. The purpose of setting the above structure is that, in the unfolded state, two identical triangular structures are formed on both sides of the third support 203. Each triangle will bear approximately equal stress, thereby reducing the possibility of one side being overloaded while the other side is not fully utilized. This allows the vertical load borne by the first support 201 and the third support 203 to be evenly distributed and transmitted downwards. From a design perspective, using triangles of the same shape can make the folding assembly 300 look more symmetrical and beautiful, improving the stability and aesthetics of the multi-functional fitness chair.

[0056] It should be noted that the first pivot part 305, the third pivot part 307, the second pivot part 306, the fourth pivot part 308, and each pivot part on the second connecting rod structure 302 mentioned above realize the rotational movement of multiple adjacent structures by setting a pivot structure. The pivot structure is provided with a rod body, and the two ends of the rod body are respectively inserted into the structure connected to it, so that the structures on both sides of the pivot part can rotate around the rod body as the axis.

[0057] Preferred, such as Figure 2 and Figure 8 As shown, a first locking component 312 is provided on the fourth support portion 204 of the second linkage structure 302 to limit the folding component 300 in the unfolded state and the storage mode. Of course, the first locking component 312 can also be provided on the third support portion 203, as long as it can achieve the effect of limiting the folding component 300. The following only describes the case where it is provided on the fourth support portion 204.

[0058] Specifically, a long, horizontally extending groove 316 is provided on the side of the fourth support portion 204 near the seat assembly 100. The groove 316 includes a first end near the seat assembly 100 and a second end away from the seat assembly 100. The first locking component 312 includes a first slider 313, a first spring pin 314, and a second spring pin 315. The first spring pin 314 and the second spring pin 315 are disposed opposite to each other on the fourth support portion 204. The first spring pin 314 corresponds to the first end of the groove 316, and the second spring pin 315 corresponds to the second end. The first slider 313 is disposed within the groove 316 of the fourth support portion 204. The seventh pivot connection... The rod 318 of part 311 passes through the first slider 313 and can reciprocate within the slide groove 316 with the first slider 313. The first slider 313 is provided with a pin hole 317. When the pin hole 317 is opposite to the first spring pin 314 or the second spring pin 315, the first spring pin 314 or the second spring pin 315 is inserted into the pin hole 317 by the force of its internal spring, thereby limiting the first slider 313 and restricting the movement of the seventh pivot part 311. This ensures the overall structural stability of the multifunctional fitness device in the unfolded state and the storage mode, prevents its overall structure from being changed by external forces, and improves the exercise effect during exercise and the safety in the storage mode.

[0059] Preferably, the first spring pin 314 and the second spring pin 315 are disposed on the outer side wall 208 of the fourth support portion 204 or on the inner side wall 207 of the fourth support portion 204. The purpose of this arrangement is that, on the one hand, it is convenient for the user to operate the spring pins from one side of the chair, and on the other hand, it can better fold the first inner connecting arm 303, the first outer connecting arm 304, the second inner connecting arm 309, the second outer connecting arm 310 and the chair leg 200 to the same plane, making the overall structure more compact and integrated.

[0060] Furthermore, such as Figure 4As shown, in the lateral positional relationship, the position closer to the middle point of the seat assembly is defined as the first side, and the position farther from the middle point of the seat assembly is defined as the second side. The first outer connecting arm 304 and the first inner connecting arm 303 are respectively arranged on both sides of the third support part 203. The first outer connecting arm 304 is arranged between the first support part 201 and the third support part 203, the first inner connecting arm 303 is arranged closer to the first side, and the first support part 201 is arranged closer to the second side. Thus, in the lateral direction, the first support part 201, the first outer connecting arm 304, the third support part 203, and the first inner connecting arm 303 are arranged sequentially from the second side to the first side, and there is no intersection between the structures. Therefore, during the process of folding and moving the chair leg 200 toward the surface where the seat assembly 100 is located, the connecting arm and the support part in the first linkage structure 301 will not be unable to be fully folded due to the intersection positional relationship. The first support part 201 and the third support part 203 in the storage mode overlap in the same direction, which improves the aesthetics and facilitates miniaturization.

[0061] like Figure 9 and Figure 10 As shown, the chair back assembly 500 includes a resistance unit 501, a third rod portion 502, a rotating unit 503, and a first backrest 504. The third rod portion 502 is disposed relative to the fourth frame portion 106 of the seat support 101 and is fixedly connected to the fourth frame portion 106 via an extension portion 107 on the seat support 101. One end of the first backrest 504 near the seat assembly 100 is rotatably connected to the third rod portion 502 via the rotating unit 503. The relative movement between the third rod portion 502 and the first backrest 504 can be limited by adjusting the rotating unit 503. One end of the seat assembly 100 is connected to the resistance unit 501. The first back bar 504 is set as a telescopic structure and can rotate around the third bar 502 as an axis. This allows the resistance unit 501 to adjust its distance from the seat assembly 100 as the first back bar 504 extends and retracts, and to adjust to different exercise angles and folding angles as the first back bar 504 rotates. In other words, the height and angle of the resistance unit 501 are adjustable to meet the adjustment needs of users of different heights and body lengths. At the same time, the overall height of the backrest assembly 500 can be reduced, achieving a miniaturized folding and storage effect.

[0062] It is understandable that, in order to enhance the stability of the chair back assembly 500, the present invention provides a first backrest 504 and a second backrest 505 that are arranged opposite each other. The first backrest 504 and the second backrest 505 have the same structure and are arranged symmetrically. The following description will mainly take the specific structure of the first backrest 504 as an example.

[0063] The first backrest 504 includes a fourth spring pin 507, a first base portion 508, and a first extension portion 509. One end of the first base portion 508 and one end of the first extension portion 509 are sleeved together. The fourth spring pin 507 is located at the end of the first base portion 508 near the first extension portion 509. The first extension portion 509 has multiple limiting holes spaced apart. The fourth spring pin 507 can pass through the first base portion 508 and into different limiting holes in the first extension portion 509 to achieve telescopic adjustment and limiting fixation of the first backrest 504. The second backrest 505 is disposed opposite to the first backrest 504 at both ends of the third rod portion 502. Correspondingly, the second backrest 505 includes a second base portion 510 and a second extension portion 511 sleeved together. A top rod 506 is disposed above the first extension portion 509 and the second extension portion 511. The top rod 506 establishes a stable connection between the first backrest 504 and the second backrest 505 and can also be used to support the cushion and other structures of the chair seat assembly 100.

[0064] The resistance unit 501 includes a first resistance component 512 and a second resistance component arranged symmetrically. The following description mainly takes the structure of the first resistance component 512 as an example. The first resistance component 512 includes a first fixing ring 513, a first steering wheel 514, a first reversing wheel 515, and a first rope 516. The first fixing ring 513 and the first reversing wheel 515 are arranged on the side near the second extension 511. The first steering wheel 514 is arranged on the side near the first extension 509. One end of the first rope 516 is connected to the first fixing ring 513. The other end of the first rope 516 passes through the first steering wheel 514 and then through the first reversing wheel 515 out of the backrest assembly 500 and is connected to the handle 517, so that the first rope 516 is folded laterally. The first rope 516 is an elastic pull rope.

[0065] The purpose of the above structure is to ensure that the resistance training requires sufficient rope length to allow the human body to complete the entire range of motion, thereby effectively training the target muscle groups and adapting to these diverse training needs. This ensures that the first rope 516 has sufficient length and a high range of motion. By concentrating the range of motion of the first rope 516 laterally on the upper side of the backrest assembly 500, it occupies only a small portion of the vertical space of the backrest assembly 500. Combined with the telescopic structure of the first back bar 504 and the second back bar 505, the height of the resistance unit 501 on the backrest assembly 500 can be adjusted, thus making it suitable for users of different body sizes to exercise or to form different training modes. In addition, the resistance unit 501 can be adjusted to the lowest height and then folded for storage, which can further realize the miniaturization of the fitness chair.

[0066] Specifically, both the first steering wheel 514 and the first reversing wheel 515 are fixed pulley structures. The first steering wheel 514 is located on the side of the first extension 509 facing the second extension 511 to reduce unnecessary angle adjustments when the first rope 516 reaches the opposite side of the first extension 509 from the first fixing ring 513, so as to quickly complete the reversal of the direction of the first rope 516 and improve the working efficiency of the resistance system. The side of the second extension 511 facing the rear side of the backrest assembly 500 is defined as the rear side 518. The first reversing wheel 515 is located on the rear side 518 of the second extension 511, so that the resistance system is concentrated on the rear side of the backrest assembly 500. Thus, when the backrest assembly 500 is folded forward, it can fit with the seat assembly 100, improving the folding and storage effect.

[0067] Furthermore, the pulley axis of the first directional pulley 515 is parallel to the axis of the first backrest 504. Therefore, when the chair back assembly 500 rotates backward or downward to perform movements such as flying or rowing, the force exerted by the human body on the first rope 516 tends to be perpendicular to the first backrest 504. This helps to secure the first rope 516 to the first directional pulley 515 and prevents the first rope 516 from slipping vertically off the first directional pulley 515. Consequently, the pulley axis of the first steering pulley 514 is perpendicular to the axis of the first directional pulley 515. The vertical arrangement of the pulleys along the axis reduces the force that would cause the first rope 516 to detach from the first steering wheel 514 or the first directional wheel 515 when the first rope 516 is stretched at different angles. This arrangement keeps the first rope 516 within the pulley grooves of the first steering wheel 514 and the first directional wheel 515 as much as possible when it changes direction, thus preventing injury to the human body caused by the first rope 516 detaching from the first steering wheel 514 or the first directional wheel 515. This also improves the stability of the resistance unit 501 and the safety of the multi-functional fitness chair.

[0068] Furthermore, the first fixing ring 513 is disposed at one end of the top rod 506 near the second extension 511, so that the first fixing ring 513 corresponds to the pulley groove of the first steering wheel 514, thereby enabling the first rope 516 to quickly complete the turning at the position of the first steering wheel 514, reducing the deflection of the first rope 516 between the first fixing ring 513 and the first steering wheel 514, and improving the stability of the resistance system. Of course, the first fixing ring 513 can also be disposed at one end of the second extension 511 near the top rod 506. Those skilled in the art can choose according to the actual situation, as long as the first fixing ring 513 and the pulley groove of the first steering wheel 514 can be basically aligned.

[0069] It should be noted that the first fixing ring 513, the first steering wheel 514, the first directional wheel 515, the first rope 516 in the first resistance assembly 512, and the corresponding structures in the second resistance assembly can be installed on the first back bar 504 and the second back bar 505, or as follows: Figure 14and Figure 15 As shown, it is set on the frame structure 519, and then the frame structure 519 is connected to the adjustable rod 520. Those skilled in the art can choose according to actual needs.

[0070] It is understood that two identical rotating units 503 are set in this utility model, which are symmetrically arranged at both ends of the third rod 502 to increase the stability of the third rod 502 and the first back rod 504 after they are fixed. Those skilled in the art can also set only one set according to actual needs, as long as the fixing effect between the chair back assembly 500 and the chair surface support 101 can be achieved. The following description only takes the rotating unit 503 on one side of the first back rod 504 as an example.

[0071] The rotating unit 503 includes a chuck assembly and an adjusting assembly connected to each other. The two sides of the chuck assembly are respectively connected to the first back rod 504 and the third rod 502. Rotating the adjusting assembly can drive the chuck assembly to engage or disengage, thereby realizing the fixing and unlocking between the third rod 502 and the first back rod 504. After unlocking, the first back rod 504 can rotate with the third rod 502 as the axis.

[0072] Specifically, the chuck assembly of the rotating unit 503 includes a first chuck 521 and a second chuck 522 disposed opposite to each other. The first chuck 521 is fixed to one end of the third rod portion 502, and the second chuck 522 is fixed to one end of the first back rod 504. Engaging structures are provided at intervals on the opposing surfaces of the first chuck 521 and the second chuck 522. In this embodiment, the engaging structures are concave teeth and convex teeth, so that after the first chuck 521 and the second chuck 522 abut against each other, the concave teeth and convex teeth mesh with each other to form a locked state of the chuck assembly. The adjustment assembly of the rotating unit 503 includes a rotating shaft 523, a bushing 524, an adjusting rod 525, a stop pin (not shown in the figure), and a washer 526. The outer wall of the tubular bushing 524 is fixedly connected to the first back rod 504. One end of the bushing 524 is fixedly connected to the second chuck 522, and the other end is connected to the adjusting rod 525. A through hole is provided between the first chuck 521 and the second chuck 522. One side of the tubular rotating shaft 523 passes through the through hole, and the outer wall of the rotating shaft 523 is fixedly connected to the first chuck 521. The other side of the rotating shaft 523 passes through the bushing 524. Thus, when the first chuck 521 and the second chuck 522 are separated, the rotating shaft 523 can rotate relative to the first back rod 504 within the bushing 524, thereby allowing the first back rod 504 to rotate around the third rod portion 502 as an axis.

[0073] One end of the adjusting rod 525 passes through the bushing 524 into the rotating shaft 523, and the outer wall of the adjusting rod 525 is threadedly connected to the inner wall of the rotating shaft 523. The other end of the adjusting rod 525 is connected to the bushing 524 and protrudes from the bushing 524. The protruding part is used for rotation operation. Rotating the adjusting rod 525 allows the adjusting rod 525 to move laterally relative to the rotating shaft 523. When they approach each other, the adjusting rod 525 drives the second chuck 522 to move toward the first chuck 521 through the bushing 524, until the chuck assembly is engaged. When they separate, the second chuck 522 moves away from the first chuck 521, until the chuck assembly separates, thereby achieving relative fixation and unlocking between the third rod 502 and the first backrest 504. As a result, the chair back assembly 500 can rotate relative to the seat support 101, and the two can form an angle of 0° to 270° in the lateral direction, and can be locked at any angle, such as... Figure 12 and Figure 13 As shown, on the one hand, the backrest assembly 500 and the seat assembly 100 can be opened to form an angle of 180 degrees, forming a folding mode on the same plane, which improves the space utilization of the storage mode. On the other hand, by using different opening and closing angles, in conjunction with the resistance unit 501 on the backrest assembly 500 and the inclined chair leg 200 structure, various exercises can be performed, which enhances the expandability and flexibility of the multi-functional fitness chair.

[0074] Furthermore, a through hole 527 is provided at the end of the adjusting rod 525 that is inserted into the rotating shaft 523. A rod-shaped stop pin is inserted through the through hole 527. The length of the stop pin is not less than the diameter of the rotating shaft 523. When the adjusting rod 525 moves away from the rotating shaft 523, the stop pin can abut against the rotating shaft 523 and prevent the adjusting rod 525 from moving further, thus preventing the adjusting rod 525 from completely dislodging from the rotating shaft 523 and improving ease of use for the user. In addition, a washer 526 is provided between the bushing 524 and the adjusting rod 525 to enhance the friction between the two, thereby increasing the friction at the threaded connection between the adjusting rod 525 and the rotating shaft 523 and enhancing the stability of the rotating unit 503.

[0075] It is understood that those skilled in the art can set the resistance unit 501 as a coil spring structure or adjust the number and position of the pulley group according to actual needs, as long as the integration and miniaturization of the resistance unit 501 are achieved under the premise of meeting sufficient elastic deformation distance. Sufficient elastic deformation distance refers to the displacement length of the hand or foot required for a general adult to complete a full stroke of flying, rowing, or other sports.

[0076] The chair back assembly and multifunctional fitness chair of this invention have the following advantages:

[0077] 1. The end of the first backrest near the seat assembly is connected to the third rod via a rotating unit, and the end of the first backrest away from the seat assembly is connected to the resistance unit. The first backrest is designed as a telescopic structure and can rotate around the third rod as an axis, so that the height and angle of the resistance unit can be adjusted to meet the adjustment needs of users of different heights and body lengths. At the same time, the overall height of the backrest assembly can be reduced, achieving a miniaturized folding and storage effect.

[0078] 2. With the first rope having sufficient length, the stretching stroke of the first rope is concentrated laterally on the upper side of the chair back assembly, occupying only a small portion of the vertical space of the chair back assembly. Combined with the telescopic structure of the first and second back bars, the height of the resistance unit on the chair back assembly can be adjusted. In addition, the resistance unit can be adjusted to the lowest height and then folded for storage, which can further realize the miniaturization of the fitness chair.

[0079] 3. The pulley axis of the first deflector is parallel to the axis of the first back bar to prevent the first rope from slipping off the first deflector vertically. The pulley axis of the first steering wheel is perpendicular to the pulley axis of the first deflector. This reduces the force that would cause the first rope to slip off the first steering wheel or the first deflector when the first rope is stretched at different angles, thus preventing injury to the human body caused by the first rope slipping off the first steering wheel or the first deflector and improving the stability of the resistance unit and the safety of the multi-functional fitness chair.

[0080] The terms “above,” “below,” and “within” as used above include the number itself; the terms “exceeding” and “excluding” do not include the number itself.

[0081] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0082] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

Claims

1. A chair back assembly, disposed on a chair seat assembly, characterized in that, It includes a resistance unit, a third rod, a rotating unit, and a first backrest. The third rod is located near the seat assembly, and the rotating unit is located on the third rod. The end of the first backrest near the seat assembly is connected to the third rod through the rotating unit, and the end of the first backrest away from the seat assembly is connected to the resistance unit. The first backrest is designed as a telescopic structure and can rotate around the third rod as an axis.

2. The chair back assembly as claimed in claim 1, characterized in that, The first back bar includes a fourth spring pin, and a first base and a first extension that are sleeved together. The fourth spring pin is disposed on the first base, and a plurality of limiting holes are provided at intervals on the first extension. The fourth spring pin can pass through the first base and into different limiting holes of the first extension.

3. The chair back assembly as described in claim 2, characterized in that, It also includes a second back bar, which is disposed opposite to the first back bar at both ends of the third bar. The second back bar includes a second base part and a second extension part that are sleeved together.

4. The chair back assembly as described in claim 3, characterized in that, The resistance unit includes a first resistance component, which includes a first fixed ring, a first steering wheel, a first reversing wheel, and a first rope. The first fixed ring and the first reversing wheel are located on the side near the second extension, and the first steering wheel is located on the side near the first extension. One end of the first rope is connected to the first fixed ring, and the other end of the first rope passes through the first steering wheel and then through the first reversing wheel to exit the chair back assembly, so that the first rope is folded laterally.

5. The chair back assembly as described in claim 4, characterized in that, The first steering wheel is located on the side of the first extension facing the second extension, and the first directional wheel is located on the rear side of the second extension.

6. The chair back assembly as claimed in claim 5, characterized in that, The pulley axis of the first directional wheel is parallel to the axis of the second back rod, and the pulley axis of the first steering wheel is perpendicular to the pulley axis of the first directional wheel.

7. The chair back assembly as claimed in claim 4, characterized in that, It also includes a push rod, the two ends of which are connected to the first extension and the second extension, respectively. A first fixing ring is disposed at one end of the push rod near the second extension so that the first fixing ring corresponds to the pulley groove of the first steering wheel.

8. The chair back assembly as claimed in claim 4, characterized in that, The resistance unit also includes a second resistance component, which is symmetrically arranged with the first resistance component. The second resistance unit includes a second fixed ring, a second steering wheel, a second reversing wheel, and a second rope. The second fixed ring and the second reversing wheel are located on the side near the first extension, and the second steering wheel is located on the side near the second extension. One end of the second rope is connected to the second fixed ring, and the other end of the second rope passes through the second steering wheel and then through the second reversing wheel to exit the chair back assembly, so that the second rope is folded laterally.

9. The chair back assembly as claimed in claim 1, characterized in that, The rotating unit includes a chuck assembly and an adjusting assembly connected to each other. The two sides of the chuck assembly are respectively connected to a first back rod and a third rod. The adjusting assembly can drive the chuck assembly to lock or disengage. The chuck assembly includes a first chuck and a second chuck arranged opposite each other. The first chuck is fixed on the third rod, and the second chuck is fixed on the first back rod. The first chuck and the second chuck are provided with a locking structure opposite each other. The adjusting assembly includes a rotating shaft, a bushing, an adjusting rod, a stop pin, and a washer. The outer wall of the bushing is connected to the first back rod, and the two ends of the bushing are respectively connected to the second chuck and the adjusting rod. A through hole is provided in the middle of the first chuck and the second chuck. One side of the rotating shaft passes through the through hole, and the outer wall of the rotating shaft is fixedly connected to the first chuck. The other side of the rotating shaft passes through the bushing. One end of the adjusting rod passes through the bushing into the rotating shaft, and the outer wall of the adjusting rod is threadedly connected to the inner wall of the rotating shaft. A through hole is provided at the end of the adjusting rod inserted into the rotating shaft, and the stop pin passes through the through hole. The washer is provided between the bushing and the adjusting rod.

10. A multifunctional fitness chair, characterized in that, The chair back assembly includes any one of claims 1 to 9 above.

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