Elliptical machine

Abstract

An elliptical machine with adjustable stride length and pedal elevation angle, aiming to enhance functionality and users' exercise experience. In particular, it can maintain stability under high-intensity use, making it suitable for long-term use in gyms and at home. The elliptical machine includes a chassis unit (101) and an upright frame unit (102). The pedal trajectory can be adjusted through a stride adjustment mechanism (60), providing large-stride and small-stride exercise modes. At the same time, the front-rear height difference of the pedals (34) can be changed through a pedal elevation angle adjustment mechanism (70) to simulate the movement trajectories on different terrains. In addition, the frame design improves the ability of the equipment to remain stable during the adjustment process, and the pressurizing assembly is used to prevent the transmission belt from slipping, ensuring smooth exercise.

Description

BACKGROUNDField of the Invention

[0001] The present invention relates to the technical field of cardiorespiratory fitness exercise training tools, specifically to an elliptical machine.Description of Related Art

[0002] The elliptical machine is a type of exercise equipment widely used in gyms and home environments. It can effectively simulate movements such as running and mountain climbing. Through its elliptical track design, it reduces the impact on joints like the knees. The design of traditional elliptical machines allows users to adjust the stride length, elevation angle, and handlebar stroke to accommodate the heights, body types, and exercise needs of different users. However, although the elliptical machines in the existing technology have basic adjustment functions, they still have deficiencies in terms of stability and adjustment flexibility.

[0003] For example, the adjustment of the stride length and elevation angle in elliptical machines usually relies on complex mechanical structures, such as multi-segment gears or link systems. These systems may cause looseness or shaking of the mechanism during the adjustment process, especially when the equipment is used intensively, resulting in insufficient stability. Moreover, the adjustment stroke range of the handlebars is limited, leading to differences in the exercise experience of different users.

[0004] Therefore, how to provide an elliptical exercise bike that can balance flexibility and stability during the adjustment of the stride length, elevation angle, and handlebar stroke and provide a better user experience is an urgent problem to be solved in the current technology.SUMMARY

[0005] In view of the above-mentioned situation, the main objective of the present invention is to provide an elliptical machine with adjustable stride length, so as to enhance the functionality of the elliptical machine, improve the overall exercise experience of users, maintain stability especially under high-intensity use, and make it more suitable for long-term use in gyms or at home.

[0006] To achieve the above-mentioned objective, the technical solution adopted by the present invention is to provide an elliptical machine, which includes: a frame body, with a bearing beam provided at the top of the frame body; a crank transmission mechanism having oppositely arranged cranks coaxially and pivotally connected to left and right sides of the frame body; left and right pedal swing assemblies, each having a bearing connecting arm, a front swing arm pivotally connected between a top end of the frame body and a front end of the bearing connecting arm, a rear swing arm pivotally connected between a corresponding one of the cranks and a middle section of the bearing connecting arm, and a pedal fixed at a rear end of the bearing connecting arm; left and right stride adjustment mechanisms, each including a sliding sleeve member slidably arranged on the top of the rear swing arm, a positioning member locked on the rear side of the sliding sleeve member, and a connecting rod with a front end pivotally connected to a front end of the bearing beam and a rear end pivotally connected to a front side of the sliding sleeve member; wherein a pivotal connection point of the rear swing arm and the corresponding one of the cranks is defined as a first pivot point, a pivotal connection point of the sliding sleeve member and the connecting rod is defined as a second pivot point, and a pivotal connection point of the rear swing arm and the bearing connecting arm is defined as a third pivot point, so that the elliptical machine adjusts a length ratio between a length from the first pivot point to the third pivot point and a length from the second pivot point to the third pivot point through the positioning member.

[0007] Another objective of the present invention is to provide an elliptical machine capable of adjusting the pedal elevation angle, aiming to enhance the functionality of the elliptical machine, improve the overall exercise experience of users. In particular, it can maintain stability under high-intensity usage, making it more suitable for long-term use in gyms or at home.

[0008] To achieve the above-mentioned objective, the technical solution adopted by the present invention is to provide an elliptical machine, which includes: a frame body including: a front post with a bottom end pivoted to the frame body and a top end capable of pivotally swinging, and a rear post located behind the front post and fixed to the frame body; a crank transmission mechanism having oppositely arranged cranks coaxially and pivotally connected to left and right sides of the rear post; left and right pedal swing assemblies, each having a bearing connecting arm, a front swing arm pivotally connected between a top end of the front post and a front end of the bearing connecting arm, a rear swing arm pivotally connected between a corresponding one of the cranks and a middle section of the bearing connecting arm, and a pedal fixed at a rear end of the bearing connecting arm; a pedal elevation angle adjustment mechanism including: an outer sleeve with a front end pivoted to the front post, a screw rod with a front end telescopically screwed into the outer sleeve, and a drive motor with a front end power-connected to a rear end of the screw rod and a rear end pivoted to the rear post, so that a position of a top end of the front swing arm of each of the pedal swing assemblies is adjusted by extension and retraction of the screw rod caused by the drive motor.

[0009] Another objective of the present invention is to provide an elliptical machine that can adjust both the stride distance and the pedal elevation angle, so as to enhance the functionality of the elliptical machine, improve the overall exercise experience of users. Especially, it can maintain stability under high-intensity use, making it more suitable for long-term use in gyms or at home.

[0010] To achieve the above-mentioned objective, the technical solution adopted by the present invention is to provide an elliptical machine, which includes: a frame body including: a front post with a bottom end pivoted to the frame body and a top end capable of pivotally swinging, a rear post located behind the front post and fixed to the frame body, and a bearing beam provided at the top of the rear post; a crank transmission mechanism having oppositely arranged cranks coaxially and pivotally connected to left and right sides of the rear post; left and right pedal swing assemblies, each having a bearing connecting arm, a front swing arm pivotally connected between a top end of the front post and a front end of the bearing connecting arm, a rear swing arm pivotally connected between a corresponding one of the cranks and a middle section of the bearing connecting arm, and a pedal fixed at a rear end of the bearing connecting arm; left and right stride adjustment mechanisms, each including a sliding sleeve member slidably arranged on the top of the rear swing arm, a positioning member locked on the rear side of the sliding sleeve member, and a connecting rod with a front end pivotally connected to a front end of the bearing beam and a rear end pivotally connected to a front side of the sliding sleeve member, wherein a pivotal connection point of the rear swing arm and the corresponding one of the cranks is defined as a first pivot point, a pivotal connection point of the sliding sleeve member and the connecting rod is defined as a second pivot point, and a pivotal connection point of the rear swing arm and the bearing connecting arm is defined as a third pivot point, so that the elliptical machine adjusts a length ratio between a length from the first pivot point to the third pivot point and a length from the second pivot point to the third pivot point through the positioning member; a pedal elevation angle adjustment mechanism including: an outer sleeve with a front end pivoted to the front post, a screw rod with a front end telescopically screwed into the outer sleeve, and a drive motor with a front end power-connected to a rear end of the screw rod and a rear end pivoted to the rear post, so that a position of a top end of the front swing arm of each of the pedal swing assemblies is adjusted by extension and retraction of the screw rod caused by the drive motor.

[0011] According to an embodiment of the present invention, the elliptical machine further comprises: left and right reciprocating linkage assemblies, each reciprocating linkage assembly having two opposite ends, one of the two opposite ends is pivotally connected to a top of a rear post of the frame body, and the other one of the two opposite ends is pivotally connected to the rear swing arm.

[0012] Specifically, the frame body includes a chassis unit, an upright frame unit fixed on an upper side of the chassis unit, the upright frame unit includes left and right side posts, a front post arranged between the side posts, a rear post located behind the front post, and a crossbar with a middle section fixedly connected to a front end of the rear post and two ends fixedly connected to the side posts, and a bearing beam disposed at a top end of the rear post, the left and right side posts, the front post and the rear post have their bottom ends connected to the chassis unit.

[0013] Specifically, each of the reciprocating linkage assemblies has a vertical rod and a horizontal rod; top and bottom ends of the vertical rod are respectively pivotally connected between the top of the rear post and the front end of the horizontal rod, a rear end of the horizontal rod is pivotally connected to a part near the top end of the rear swing arm and is located below the corresponding one of the cranks.

[0014] According to an embodiment of the present invention, the rear swing arm of each of the pedal swing assemblies is provided with a high-positioning point and a low-positioning point close to a top end thereof; the sliding sleeve member is restricted and fixed to the high-positioning point or the low-positioning point by the positioning member to adjust the position of the second pivot point, thereby changing the length ratio between the length from the first pivot point to the third pivot point and the length from the second pivot point to the third pivot point, thereby linking the pedal swing assemblies and causing the pedals to move along a small-stride trajectory or a large-stride trajectory.

[0015] According to an embodiment of the present invention, the sliding sleeve member of each of the stride adjustment mechanisms includes a sleeve and upper and lower collar fasteners; the sliding sleeve member is provided with a boss with an internal threaded hole on a rear side of a top end of the sleeve, and the positioning member is adjustably locked on the sliding sleeve member through the boss; a clearance space is provided between an inner surface of the sleeve and an outer surface of the rear swing arm, for the positioning member to withdraw from the high-positioning point or the low-positioning point to adjust a position of the second pivot point.

[0016] According to an embodiment of the present invention, wherein a limit bump is arranged on a front side of the rear swing arm of each of the pedal swing assemblies, an elongated vertical groove is formed in a front side surface of the sleeve, so that the sliding sleeve member is slidably arranged on the top of the rear swing arm. According to an embodiment of the present invention, wherein the pedal elevation angle adjustment mechanism drives the screw rod to retract into the outer sleeve through the drive motor, so that the front post rotates to a first angular position near the rear post, to link the pedal swing assemblies and make the pedal move along a lower-level trajectory, or, the pedal elevation angle adjustment mechanism drives the screw rod to extend out of the outer sleeve through the drive motor, so that the front post rotates to a second angular position away from the rear post, to link the pedal swing assemblies and make the pedal move along an upper-level trajectory, wherein a front end of the upper-level trajectory is upwardly raised and positioned higher than a front end of the lower-level trajectory.

[0017] According to an embodiment of the present invention, the crank transmission mechanism includes the cranks, a transmission pulley set, and a flywheel. The flywheel is connected to the crank through the transmission pulley set for transmission. The pedal swing assemblies drive the cranks to rotate, thus driving the flywheel to rotate and forming the pedaling resistance of the elliptical machine.

[0018] According to an embodiment provided by the present invention, the frame body has a rear post fixedly arranged on the frame body. The transmission pulley set of the crank transmission mechanism includes a large pulley, a small pulley, and a transmission wheel. The large pulley and the cranks are arranged coaxially on one side of the rear post, and the large pulley and the small pulley are disposed at the same side of the rear post in such a manner that a first transmission belt is wound around the large pulley and the small pulley. The small pulley and the transmission wheel are arranged coaxially on two opposite sides of the rear post, and a second transmission belt is wound around the transmission wheel and the flywheel. Thereby, the pedal swing assemblies drive the cranks to rotate, sequentially rotating the large pulley, the small pulley and the transmission wheel, and further driving the flywheel to rotate.

[0019] According to an embodiment provided by the present invention, the crank transmission mechanism further includes a pressurizing assembly. The pressurizing assembly includes a lever, a compression spring and a pressurizing wheel. The middle section of the lever is arranged on the upper side of the second transmission belt with a rotatable pivot point. The compression spring has a top end fixedly connected to the side surface of the rear post and a bottom end hooked to one end of the lever. The pressurizing wheel is pivotally arranged at the other end of the lever and presses against the second transmission belt, so that the second transmission belt is tightly wound around the flywheel.

[0020] According to an embodiment provided by the present invention, the elliptical machine of the present invention is further provided with an eddy-current magnetic resistance device. The eddy-current magnetic resistance device is arranged between the flywheel and the front side of the rear post.

[0021] Since the present invention adopts the above-mentioned technical solutions, it has the following beneficial effects: (1) Stride adjustment effect: Through the stride adjustment mechanism, the present invention can simply and effectively adjust the movement trajectory of the pedals, providing two different movement modes of large-stride and small-stride. Users can adjust according to their personal needs to adapt to different training intensities and goals, thus enhancing the overall exercise experience. The adjustment of the stride not only increases the versatility of the equipment but also effectively improves the comfort of different users. (2) Pedal elevation angle adjustment effect: The pedal elevation angle adjustment mechanism in the present invention can change the front-rear height difference of the pedals through the pedal elevation angle adjustment mechanism. This design allows users to choose different trajectory modes, such as high-front-low-rear or low-front-high-rear, simulating the exercise feeling on different terrains. The addition of this function further enhances the flexibility of the elliptical machine, making it suitable for people with different exercise needs, and maintaining structural stability during high-intensity use. (3) Synchronous adjustment effect of stride and pedal angle: The present invention provides a mechanism for simultaneously adjusting the stride and the pedal elevation angle. Users can complete both adjustments at one time, greatly simplifying the complexity of equipment operation. This synchronous adjustment not only improves the convenience for users but also ensures the exercise stability in any adjusted state. It is suitable for long-term high-intensity use in gyms and can also meet the needs of home use. (4) Effect of enhancing stability of the overall frame structure: The frame design structure of the present invention, through the reasonable arrangement of the chassis unit, the upright frame unit, the crossbar, as well as the front post and the rear post, enables the elliptical machine to maintain the stability of the overall movement when adjusting the stride and the pedal elevation angle. This design ensures that under different movement modes of the elliptical machine (such as large-stride, high-front-low-rear, etc.), the mechanical structure can still effectively bear the weight and exercise force of the user, and reduces the shaking or instability during the exercise process. This frame design improves the overall rigidity and durability of the elliptical machine, is suitable for long-term high-intensity use, and ensures the operation stability of the equipment under different usage conditions. (5) Effect of the pressurizing assembly in improving stability: Through the pressurizing assembly, the present invention enables the second transmission belt to be tightly wound around the flywheel, effectively preventing the belt from slipping, thereby improving the transmission efficiency and stability. This technical means ensures the smoothness of the elliptical machine during high-intensity exercise, and improves the durability of the overall mechanical structure and the continuous stability of operation.

[0022] These and other objectives, features, and advantages of the present invention are fully reflected through the following detailed description and the claims, and can be achieved through the means, devices, and their combinations specifically pointed out in the appended claims.BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is an illustrative view of the right-rear exterior of the elliptical machine of the present invention; FIG. 2 is an illustrative view of the left-rear exterior of the elliptical machine of the present invention; FIG. 3 is an illustrative view of the left-front exterior of the elliptical machine of the present invention; FIG. 4 is an illustrative view of the right-front exterior of the elliptical machine of the present invention; FIG. 5 is an exploded view of the stride adjustment mechanism of the elliptical machine of the present invention; FIG. 6 is a combined cross-sectional view of the stride adjustment mechanism of the elliptical machine of the present invention; FIG. 7A is an illustrative view of the left-side exterior of the pedal of the elliptical machine of the present invention moving along the first trajectory; FIG. 7B is an illustrative view of the pedal elevation angle adjustment mechanism of the elliptical machine of the present invention in a contracted state; FIG. 8 is an illustrative view of the right-side exterior of the elliptical machine in FIG. 7A of the present invention; FIG. 9A is an illustrative view of the left-side exterior of the pedal of the elliptical machine of the present invention moving along the second trajectory; FIG. 9B is an illustrative view of the pedal elevation angle adjustment mechanism of the elliptical machine of the present invention in an extended state; FIG. 10 is an illustrative view of the left-side exterior of the pedals of the elliptical machine of the present invention moving along the third trajectory; FIG. 11 is an illustrative view of the left-side exterior of the pedals of the elliptical machine of the present invention moving along the fourth trajectory; FIG. 12 is a combined exterior illustrative view of the elliptical machine of the present invention with a chain cover externally installed; and FIG. 13 is an illustrative view of a part of the elliptical machine of the present invention with a power switch base set at the bottom of the chain cover. DETAILED DESCRIPTION

[0024] Here, the detailed specific implementation solutions of the present invention will be disclosed. However, it should be understood that the disclosed implementation solutions are merely typical examples of the present invention, and the present invention can be implemented in various alternative forms. Therefore, the specific structural and functional details disclosed herein are not restrictive. Instead, based on the principle of the claims, they serve as representative principles for explaining different implementation methods to those skilled in the art.

[0025] To facilitate the understanding of the present invention, the following description is made in combination with FIGs. 1 to 11 and the embodiments.

[0026] Please refer to FIGs. 1 to 4, 7A and 8, the present invention provides an elliptical machine, which mainly includes a frame body 10, a crank transmission mechanism 20, pedal swing assemblies 30, reciprocating linkage assemblies 40 and swing arms 50 arranged on the frame body 10. By setting stride adjustment mechanisms 60 and a pedal elevation angle adjustment mechanism 70, the stride length and the pedal elevation angle can be adjusted.

[0027] The frame body 10 includes a chassis unit 101, an upright frame unit 102 fixed on the upper side of the chassis unit 101, and four support feet 103 arranged on the lower side of the chassis unit 101. The chassis unit 101 is formed into a Y-shaped structure with a front rod 11 and left and right rear rods 12 that extend in a fork manner from the bifurcation of the front rod 11. A diagonal brace 111 is fixed between the middle section of the front rod 11 near the front end thereof and the front side of a rear post 15. The upright frame unit 102 includes left and right side posts 13, left and right front posts 14 arranged between the side posts 13, the rear post 15 located behind the front posts 14, and a crossbar 16 with the middle section fixedly connected to the front end of the rear post 15 and two ends fixedly connected to the side posts 13 to form a U-shape. Among them, the bottom ends of the side posts 13 are integrally connected to form a U-shaped structure with a connection portion 131, and the connection portion 131 is fixedly connected to the front end of the front rod 11 of the chassis unit 101. The front posts 14 are straight rods, and the bottom ends of the straight rods are pivotally connected to two sides of the bottom end of the diagonal brace 111. The top end of the rear post 15 is provided with a bearing beam 18, and a suspension rod 151 protrudes from the front side of the rear post 15 and is pivotally connected to the middle section of the crossbar 16.

[0028] In the embodiment of the present invention, the four support feet 103 with adjustable height are respectively arranged on the lower side of two ends of the connection portion 131 of the side post 13 and the lower side of the extended end of the rear rod 12, for being adjusted to make the elliptical machine stand stably on a plane as a whole. Preferably, rollers 132 are arranged on the front-lower sides of the two ends of the connection portion 131 to support the overall movement of the elliptical machine, facilitating the handling of the elliptical machine as a whole.

[0029] In the embodiment of the present invention, an operation console 80 is arranged on the upper side of the rear end of the bearing beam 18, and left and right positioning grips 19 are arranged on two opposite sides of the rear end of the bearing beam 18.

[0030] The crank transmission mechanism 20 is arranged between the front post 14 and the rear post 15. Specifically, the crank transmission mechanism 20 includes cranks 21, a transmission pulley set 22 and a flywheel 23 oppositely arranged at left and right sides of the rear post 15. The flywheel 23 is in transmission connection with the cranks 21 through the transmission pulley set 22. The pedal swing assemblies 30 drive the cranks 21 to rotate, thereby rotating the flywheel 23, forming the pedaling resistance of the elliptical machine.

[0031] In the embodiment of the present invention, the transmission pulley set 22 includes a large pulley 221, a small pulley 222 and a transmission wheel 224. The large pulley 221 and the cranks 21 are arranged coaxially on one side of the rear post 15, and the large pulley 221 and the small pulley 222 are disposed at the same side of the rear post 15 in such a manner that a first transmission belt 223 is wound around the large pulley 221 and the small pulley 222. The small pulley 222 and the transmission wheel 224 are arranged coaxially on two opposite sides of the rear post 15, and a second transmission belt 225 is wound around the transmission wheel 224 and the flywheel 23. Thereby, the pedal swing assemblies 30 drive the cranks 21 to rotate, sequentially rotating the large pulley 221, the small pulley 222 and the transmission wheel 224, and further driving the flywheel 23 to rotate.

[0032] As shown in FIGs. 3 and 7A, the crank transmission mechanism 20 further includes a pressurizing assembly 24. The pressurizing assembly 24 includes a lever 241, a compression spring 242 and a pressurizing wheel 243. The middle section of the lever 241 is arranged on the upper side of the second transmission belt 225 with a rotatable pivot point. The compression spring 242 has a top end fixedly connected to the side surface of the rear post 15 and a bottom end hooked to one end of the lever 241. The pressurizing wheel 243 is pivotally arranged at the other end of the lever 241 and presses against the second transmission belt 225, so that the second transmission belt 225 is tightly wound around the flywheel 23.

[0033] As shown in FIGs. 1 and 9, left and right cantilever arms 17 extending obliquely upward are arranged on the front side of the middle section of the rear post 15. The flywheel 23 is pivotally arranged between the cantilever arms 17, and left and right tension rods 171 are also connected between the cantilever arms 17 and the rear post 15 to reinforce the structural stability of the cantilever arms 17. The lever 241 of the pressurizing assembly 24 is pivotally connected to the middle section of the tension rod 171 to form the rotatable pivot point of the lever 241. Thereby, when the compression spring 242 pulls one end of the lever 241 upward, the pressurizing wheel 243 arranged at the other end of the lever 241 can press downward against the second transmission belt 225 to prevent slipping during pedaling, improve transmission efficiency, reduce abnormal wear between the belt and the flywheel, avoid noise caused by belt looseness, and ensure the stable operation of the entire crank transmission mechanism 20.

[0034] Furthermore, the elliptical machine of the present invention is further provided with an eddy-current magnetic resistance device 90. The eddy-current magnetic resistance device 90 is arranged between the flywheel 23 and the front side of the rear post 15. Users can electrically control and adjust the rotation resistance of the flywheel 23 of the crank transmission mechanism 20 through the operation console 80 according to the difficulty level of their exercise needs.

[0035] The frame body 10 is provided with left and right pedal swing assemblies 30. Each of the pedal swing assemblies 30 includes a bearing connecting arm 31, a front swing arm 32 pivotally connected between the top end of the front post 14 and the front end of the bearing connecting arm 31, a rear swing arm 33 pivotally connected between a corresponding one of the cranks 21 and the middle section of the bearing connecting arm 31, and a pedal 34 fixed at the rear end of the bearing connecting arm 31. The rear swing arm 33 is provided with a high-positioning point 331 and a low-positioning point 332 near the top end thereof.

[0036] The frame body 10 is provided with left and right reciprocating linkage assemblies 40. Each of the reciprocating linkage assemblies 40 includes a vertical rod 41 and a horizontal rod 42. The top and bottom ends of the vertical rod 41 are respectively pivotally connected between the front end of the suspension rod 151 and the front end of the horizontal rod 42. The rear end of the horizontal rod 42 is pivotally connected to the part near the top end of the rear swing arm 33 and is located below the corresponding one of the cranks 21. Specifically, the top end of the vertical rod 41 is pivotally connected to the front end of the suspension rod 151 through the crossbar 16.

[0037] The frame body 10 is provided with left and right swing arms 50. Each of the swing arms 50 is provided with a handle 51 at the top end thereof, and the bottom end of each of the swing arms 50 is pivotally connected to the middle section of the vertical rod 41.

[0038] As shown in FIGs. 3, 5 and 6, the frame body 10 is provided with left and right stride adjustment mechanisms 60. Each of the stride adjustment mechanisms 60 includes a sliding sleeve member 61 slidably arranged on the top of the rear swing arm 33, a positioning member 62 locked on the rear side of the sliding sleeve member 61, and a connecting rod 63 with a front end pivotally connected to a front end of the bearing beam 18 and a rear end pivotally connected to a front side of the sliding sleeve member 61.

[0039] As shown in FIGs. 7A, 8, 9A, 10 and 11, a pivotal connection point of the rear swing arm 33 and the crank 21 is defined as a first pivot point P1, a pivotal connection point of the sliding sleeve member 61 and the connecting rod 63 is defined as a second pivot point P2, and a pivotal connection point of the rear swing arm 33 and the bearing connecting arm 31 is defined as a third pivot point P3. Thereby, the elliptical machine adjusts the length ratio between the length from the first pivot point P1 to the third pivot point P3 and the length from the second pivot point P2 to the third pivot point P3 through the positioning member 62.

[0040] More specifically, the sliding sleeve member 61 is restricted and fixed to the high-positioning point 331 or the low-positioning point 332 by the positioning member 62 to adjust the position of the second pivot point P2, thereby changing the length ratio between the length from the first pivot point P1 to the third pivot point P3 and the length from the second pivot point P2 to the third pivot point P3, thereby linking the pedal swing assemblies 30 and causing the pedals 34 to move along a small-stride trajectory or a large-stride trajectory.

[0041] In the embodiment of the present invention, the sliding sleeve member 61 of each of the stride adjustment mechanisms 60 includes a sleeve 611 and upper and lower collar fasteners 612. The sliding sleeve member 61 is provided with a boss 615 with an internal threaded hole on the rear side of the top end of the sleeve 611. The positioning member 62 is formed with a head 621 for the operator to control, a threaded portion 622 in the middle section and a convex pin portion 623 at the end thereof. The positioning member 62 is adjustably locked on the sliding sleeve member 61 through the threaded portion 622 being locked with the internal thread of the boss 615, so as to control the convex pin portion 623 of the positioning member 62 to be correspondingly locked into the high-positioning point 331 or the low-positioning point 332 formed as a hole structure. In addition, a clearance space 614 is provided between the inner surface of the sleeve 611 and the outer surface of the rear swing arm 33, for the positioning member 62 to withdraw from the high-positioning point 331 or the low-positioning point 332 and move to another position.

[0042] In the embodiment of the present invention, a limit bump 333 is additionally arranged on the front side of the rear swing arm 33 of the pedal swing assembly 30. An elongated vertical groove 613 is formed in the front side surface of the sleeve 611, so that the sliding sleeve member 61 is slidably arranged on the top of the rear swing arm 33. Specifically, the limit bump 333 can be formed by the bolt head locked into the rear swing arm 33.

[0043] As shown in FIGs. 4, 7A, 7B, 9A and 9B, the frame body 10 is also provided with a pedal elevation angle adjustment mechanism 70. The pedal elevation angle adjustment mechanism 70 includes an outer sleeve 71, a screw rod 72 with the front end telescopically screwed into the outer sleeve 71, and a drive motor 73 power-connected to the rear end of the screw rod 72. The drive motor 73 is pivotally connected to the part of the rear post 15 near the bottom end thereof, and the front end of the outer sleeve 71 is pivotally connected to the parts of the straight rods of the front posts 14 near the bottom ends thereof. Thereby, the position of the top end of the front swing arm 32 of the pedal swing assembly 30 is adjusted by adjusting the extension and retraction of the screw rod 72 through the drive motor 73.

[0044] More specifically, the pedal elevation angle adjustment mechanism 70 drives the screw rod 72 to retract into the outer sleeve 71 through the drive motor 73, so that the front post 14 rotates to a first angular position near the rear post 15, to link the pedal swing assembly 30 and make the pedal 34 move along a lower-level trajectory. Or, the pedal elevation angle adjustment mechanism 70 drives the screw rod 72 to extend out of the outer sleeve 71 through the drive motor 73, so that the front post 14 rotates to a second angular position away from the rear post 15, to link the pedal swing assembly 30 and make the pedal 34 move along an upper-level trajectory, wherein a front end of the upper-level trajectory is upwardly raised and positioned higher than a front end of the lower-level trajectory.

[0045] The above has described the specific structural embodiments of the elliptical machine of the present invention. Next, with reference to FIGs. 1 to 4, combined with FIGs. 7A, 9A, 10 and 11, the motion modes of the elliptical machine of the present invention will be described as follows.

[0046] As described above, the elliptical machine of the present invention can form the following four modes by controlling the stride adjustment mechanism 60 and the pedal elevation angle adjustment mechanism 70: Mode (1): Small stride and the pedal trajectory is front-low-rear-high. As shown in FIG. 7A, at this time, the positioning member 62 of the stride adjustment mechanism 60 is positioned at the high-positioning point 331. The vertical distance from the pivotal connection point (the second pivot point P2) of the sliding sleeve member 61 and the connecting rod 63 to the pivotal connection point (the first pivot point P1) of the rear swing arm 33 and the cranks 21 on the same side is a high-position length L1. The screw rod 72 of the pedal elevation angle adjustment mechanism 70 is in a contracted state, so that the front post 14 and the rear post 15 are approximately parallel with a small included angle. The pedal 34 moves along a first trajectory T1 due to linkage with the pedal swing assembly 30. The first trajectory T1 is approximately an ellipse with the front end inclined downward, and the long-axis direction of the first trajectory T1 has a first axis length D1. Mode (2): Small stride and the pedal trajectory is front-high-rear-low. As shown in FIG. 9A, at this time, the positioning member 62 of the stride adjustment mechanism 60 is positioned at the high-positioning point 331. The vertical distance from the pivotal connection point (the second pivot point P2) of the sliding sleeve member 61 and the connecting rod 63 to the pivotal connection point (the first pivot point P1) of the rear swing arm 33 and the crank 21 on the same side is the same as the high-position length L1 in Mode (1). The screw rod 72 of the pedal elevation angle adjustment mechanism 70 is in an extended state, so that the front post 14 rotates in a direction away from the rear post 15 with a large included angle. The pedal 34 moves along a second trajectory T2 due to linkage with the pedal swing assembly 30. The second trajectory T2 is approximately an ellipse with the front end upwardly raised, and the long-axis direction of the second trajectory T2 has a second axis length D2. Mode (3): Large stride and the pedal trajectory is front-low-rear-high. As shown in FIG. 10, at this time, the positioning member 62 of the stride adjustment mechanism 60 is positioned at the low-positioning point 332. The vertical distance between the pivotal connection point (the second pivot point P2) of the sliding sleeve member 61 and the connecting rod 63 and the pivotal connection point (the first pivot point P1) of the rear swing arm 33 and the crank 21 on the same side is a low-position length L2, and the low-position length L2 is less than the high-position length L1. The screw rod 72 of the pedal elevation angle adjustment mechanism 70 is in a contracted state, making the front post 14 and the rear post 15 approximately parallel with a small included angle. The pedal 34 moves along a third trajectory T3 due to linkage with the pedal swing assembly 30. The third trajectory T3 is approximately an ellipse with the front end inclined downward, and the long-axis direction of the third trajectory T3 has a third axis length D3. Mode (4): Large stride and the pedal trajectory is front-high-rear-low. As shown in FIG. 11, at this time, the positioning member 62 of the stride adjustment mechanism 60 is positioned at the low-positioning point 332. The vertical distance between the pivotal connection point (the second pivot point P2) of the sliding sleeve member 61 and the connecting rod 63 and the pivotal connection point (the first pivot point P1) of the rear swing arm 33 and the crank 21 on the same side is the same low-position length L2 as in Mode (3). The screw rod 72 of the pedal elevation angle adjustment mechanism 70 is in an extended state, causing the front post 14 to rotate in a direction away from the rear post 15 with a large included angle. The pedal 34 moves along a fourth trajectory T4 due to linkage with the pedal swing assembly 30. The fourth trajectory T4 is approximately an ellipse with the front end upwardly raised, and the long-axis direction of the fourth trajectory T4 has a fourth axis length D4.

[0047] In the embodiments of the present invention, in Modes (1) to (4), the first trajectory T1, the second trajectory T2, the third trajectory T3, and the fourth trajectory T4 refer to the movement trajectory of the rearmost end of the pedals 34.

[0048] In the embodiments of the present invention, the lengths of the long-axis directions of the first trajectory T1 to the fourth trajectory T4, in ascending order, are the first axis length D1, the second axis length D2, the third axis length D3, and the fourth axis length D4 (i.e., the first trajectory T1 has the shortest long-axis length, and the fourth axis length D4 has the longest long-axis length).

[0049] In the embodiments of the present invention, when the high-position length L1 is 17.5 cm and the low-position length L2 is 15 cm, the first axis length D1 can be 52.4 cm, the second axis length D2 can be 54.2 cm, the third axis length D3 can be 59.2 cm, and the fourth axis length D4 can be 61.5 cm.

[0050] In the embodiments of the present invention, in Mode (1), the long-axis direction of the first trajectory T1 can deviate from the horizontal plane and incline downward by 10.1°.

[0051] In the embodiments of the present invention, in Mode (2), the long-axis direction of the second trajectory T2 can deviate from the horizontal plane and ascend upward by 6.6°.

[0052] In the embodiments of the present invention, in Mode (3), the long-axis direction of the third trajectory T3 can deviate from the horizontal plane and incline downward by 8.5°.

[0053] In the embodiments of the present invention, in Mode (4), the long-axis direction of the fourth trajectory T4 can deviate from the horizontal plane and ascend upward by 8.7°.

[0054] As shown in FIGs. 12 and 13, in the embodiments of the present invention, a chain cover A can be further installed on the outside of the elliptical machine to shield and protect the crank transmission mechanism 20 and part of the pedal elevation angle adjustment mechanism 70. Specifically, the chain cover is composed of two symmetrically-arranged shell covers that are joined together. The top of the chain cover A is symmetrically provided with top holes A1, through-holes A2, crank grooves A3, and sliding grooves A4, and the bottom of the chain cover A is provided with a power switch base A5. Among them, the top holes A1 are for the pivotal connection rod between the connecting rod 63 and the bearing beam 18 to pass through; the through-holes A2 are for the middle section of the U-shaped crossbar 16 to be inserted; the crank grooves A3 are for placing and exposing the cranks 21; the sliding grooves A4 are for the pivotal connection rod between the front post 14 and the flywheel 23 to pass through; the power switch base A5 electrically controls the connection or disconnection between the operation console 80 and the power supply.

[0055] The present invention has been described in detail above in combination with the accompanying drawings and embodiments. Those of ordinary skill in the art can make various variations to the present invention according to the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the protection scope of the present invention shall be defined by the scope of the appended claims.

Claims

1. An elliptical machine, comprising a frame body (10), a crank transmission mechanism (20), and left and right pedal swing assemblies (30); wherein the frame body (10) includes a bearing beam (18) provided at the top of the frame body (10); the crank transmission mechanism (20) has oppositely arranged cranks (21) coaxially and pivotally connected to left and right sides of the frame body (10); the left and right pedal swing assemblies (30) each include a bearing connecting arm (31), a front swing arm (32) pivotally connected between a top end of the frame body (10) and a front end of the bearing connecting arm (31), a rear swing arm (33) pivotally connected between a corresponding one of the cranks (21) and a middle section of the bearing connecting arm (31), and a pedal (34) fixed at a rear end of the bearing connecting arm (31); characterized in that the elliptical machine further comprises: left and right stride adjustment mechanisms (60), each includes a sliding sleeve member (61) slidably arranged on the top of the rear swing arm (33), a positioning member (62) locked on the rear side of the sliding sleeve member (61), and a connecting rod (63) with a front end pivotally connected to a front end of the bearing beam (18) and a rear end pivotally connected to a front side of the sliding sleeve member (61); a pivotal connection point of the rear swing arm (33) and the corresponding one of the cranks (21) is defined as a first pivot point (P1), a pivotal connection point of the sliding sleeve member (61) and the connecting rod (63) is defined as a second pivot point (P2), and a pivotal connection point of the rear swing arm (33) and the bearing connecting arm (31) is defined as a third pivot point (P3), so that the elliptical machine adjusts a length ratio between a length from the first pivot point (P1) to the third pivot point (P3) and a length from the second pivot point (P2) to the third pivot point (P3) through the positioning member (62).

2. An elliptical machine, comprising a frame body (10), a crank transmission mechanism (20), and left and right pedal swing assemblies (30); wherein the frame body (10) includes a front post (14) with a bottom end pivoted to the frame body (10) and a top end capable of pivotally swinging, and a rear post (15) located behind the front post (14) and fixed to the frame body (10); the crank transmission mechanism (20) having oppositely arranged cranks (21) coaxially and pivotally connected to left and right sides of the rear post (15); the left and right pedal swing assemblies (30) each include a bearing connecting arm (31), a front swing arm (32) pivotally connected between a top end of the front post (14) and a front end of the bearing connecting arm (31), a rear swing arm (33) pivotally connected between a corresponding one of the cranks (21) and a middle section of the bearing connecting arm (31), and a pedal (34) fixed at a rear end of the bearing connecting arm (31); characterized in that the elliptical machine further comprises: a pedal elevation angle adjustment mechanism (70) includes: an outer sleeve (71) with a front end pivoted to the front post (14), a screw rod (72) with a front end telescopically screwed into the outer sleeve (71), and a drive motor (73) with a front end power-connected to a rear end of the screw rod (72) and a rear end pivoted to the rear post (15), so that a position of a top end of the front swing arm (32) of each of the pedal swing assemblies (30) is adjusted by extension and retraction of the screw rod (72) caused by the drive motor (73).

3. An elliptical machine, comprising a frame body (10), a crank transmission mechanism (20), and left and right pedal swing assemblies (30); wherein the frame body (10) includes a front post (14) with a bottom end pivoted to the frame body (10) and a top end capable of pivotally swinging, a rear post (15) located behind the front post (14) and fixed to the frame body (10), and a bearing beam (18) provided at the top of the rear post (15); the crank transmission mechanism (20) includes oppositely arranged cranks (21) coaxially and pivotally connected to left and right sides of the rear post (15); the left and right pedal swing assemblies (30) each include a bearing connecting arm (31), a front swing arm (32) pivotally connected between a top end of the front post (14) and a front end of the bearing connecting arm (31), a rear swing arm (33) pivotally connected between a corresponding one of the cranks (21) and a middle section of the bearing connecting arm (31), and a pedal (34) fixed at a rear end of the bearing connecting arm (31); characterized in that the elliptical machine further comprises: left and right stride adjustment mechanisms (60), each includes a sliding sleeve member (61) slidably arranged on the top of the rear swing arm (33), a positioning member (62) locked on the rear side of the sliding sleeve member (61), and a connecting rod (63) with a front end pivotally connected to a front end of the bearing beam (18) and a rear end pivotally connected to a front side of the sliding sleeve member (61), wherein a pivotal connection point of the rear swing arm (33) and the corresponding one of the cranks (21) is defined as a first pivot point (P1), a pivotal connection point of the sliding sleeve member (61) and the connecting rod (63) is defined as a second pivot point (P2), and a pivotal connection point of the rear swing arm (33) and the bearing connecting arm (31) is defined as a third pivot point (P3), so that the elliptical machine adjusts a length ratio between a length from the first pivot point (P1) to the third pivot point (P3) and a length from the second pivot point (P2) to the third pivot point (P3) through the positioning member (62); a pedal elevation angle adjustment mechanism (70) includes an outer sleeve (71) with a front end pivoted to the front post (14), a screw rod (72) with a front end telescopically screwed into the outer sleeve (71), and a drive motor (73) with a front end power-connected to a rear end of the screw rod (72) and a rear end pivoted to the rear post (15), so that a position of a top end of the front swing arm (32) of each of the pedal swing assemblies (30) is adjusted by extension and retraction of the screw rod (72) caused by the drive motor (73).

4. The elliptical machine as claimed in any one of claims 1-3, characterized in that the elliptical machine further comprises: left and right reciprocating linkage assemblies (40), each of the reciprocating linkage assemblies (40) has two opposite ends, one of the two opposite ends is pivotally connected to a top of a rear post (15) of the frame body (10), and the other one of the two opposite ends is pivotally connected to the rear swing arm (33).

5. The elliptical machine as claimed in any one of claims 1-3, characterized in that: the frame body (10) includes a chassis unit (101), an upright frame unit (102) fixed on an upper side of the chassis unit (101), the upright frame unit (102) includes left and right side posts (13), a front post (14) arranged between the side posts (13), a rear post (15) located behind the front post (14), and a crossbar (16) with a middle section fixedly connected to a front end of the rear post (15) and two ends fixedly connected to the side posts (13), and a bearing beam (18) disposed at a top end of the rear post (15), the left and right side posts (13), the front post (14) and the rear post (15) have their bottom ends connected to the chassis unit (101).

6. The elliptical machine as claimed in claim 4, characterized in that the elliptical machine further comprises: each of the reciprocating linkage assemblies (40) has a vertical rod (41) and a horizontal rod (42); top and bottom ends of the vertical rod (41) are respectively pivotally connected between the top of the rear post (15) and a front end of the horizontal rod (42), a rear end of the horizontal rod (42) is pivotally connected to a part near the top end of the rear swing arm (33) and is located below the corresponding one of the cranks (21).

7. The elliptical machine as claimed in claim 1 or 3, characterized in that: the rear swing arm (33) of each of the pedal swing assemblies (30) is provided with a high-positioning point (331) and a low-positioning point (332) close to a top end thereof; the sliding sleeve member (61) is restricted and fixed to the high-positioning point (331) or the low-positioning point (332) by the positioning member (62) to adjust the position of the second pivot point (P2), thereby changing the length ratio between the length from the first pivot point (P1) to the third pivot point (P3) and the length from the second pivot point (P2) to the third pivot point (P3), thereby linking the pedal swing assemblies (30) and causing the pedals (34) to move along a small-stride trajectory or a large-stride trajectory.

8. The elliptical machine as claimed in claim 7, characterized in that: the sliding sleeve member (61) of each of the stride adjustment mechanisms (60) includes a sleeve (611) and upper and lower collar fasteners (612); the sliding sleeve member (61) is provided with a boss (615) with an internal threaded hole on a rear side of a top end of the sleeve (611), and the positioning member (62) is adjustably locked on the sliding sleeve member (61) through the boss (615); a clearance space (614) is provided between an inner surface of the sleeve (611) and an outer surface of the rear swing arm (33), for the positioning member (62) to withdraw from the high-positioning point (331) or the low-positioning point (332) to adjust a position of the second pivot point (P2).

9. The elliptical machine as claimed in claim 8, characterized in that: a limit bump (333) is arranged on a front side of the rear swing arm (33) of each of the pedal swing assemblies (30), an elongated vertical groove (613) is formed in a front side surface of the sleeve (611), so that the sliding sleeve member (61) is slidably arranged on the top of the rear swing arm (33).

10. The elliptical machine as claimed in claim 2 or 3, characterized in that: the pedal elevation angle adjustment mechanism (70) drives the screw rod (72) to retract into the outer sleeve (71) through the drive motor (73), so that the front post (14) rotates to a first angular position near the rear post (15), to link the pedal swing assemblies (30) and make the pedal (34) move along a lower-level trajectory, or, the pedal elevation angle adjustment mechanism (70) drives the screw rod (72) to extend out of the outer sleeve (71) through the drive motor (73), so that the front post (14) rotates to a second angular position away from the rear post (15), to link the pedal swing assemblies (30) and make the pedal (34) move along an upper-level trajectory, wherein a front end of the upper-level trajectory is upwardly raised and positioned higher than a front end of the lower-level trajectory.

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