Exercise machine to facilitate knee extension and trunk extension exercises
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-02-02
- Publication Date
- 2026-08-13
Smart Images
Figure US2026013584_13082026_PF_FP_ABST
Abstract
Description
EXERCISE MACHINE TO FACILITATE KNEE EXTENSION AND TRUNK EXTENSION EXERCISESTECHNICAL FIELD
[0001] The present invention relates to fitness equipment, and more specifically, to an exercise machine designed to facilitate knee extension and trunk extension exercises. The exercise machine enables users to seamlessly integrate knee extension exercises with trunk extension exercises, targeting multiple muscle groups simultaneously, improving overall strength and flexibility.BACKGROUND
[0002] The field of exercise equipment includes machines designed to isolate and target specific muscle groups to improve strength, mobility, and functional fitness. Knee extension machines, mainly used in rehabilitation and strength training, are specifically designed to target quadriceps by requiring a user to extend their knees against resistance. These knee extension machines generally utilize a fixed seat-backrest angle and linear movement paths to isolate the quadriceps muscle of the user during exercise. However, this approach has limitations that can hinder functional fitness and, in some cases, may lead to inefficiencies or even strain on the user’s joints.
[0003] Traditional knee extension machines isolate the quadriceps by requiring the user to extend their knees against resistance in a fixed path. While these machines effectively target the quadriceps muscle, they have limitations in replicating natural movement patterns, which often leads to reduced functional application and potential joint stress.
[0004] Further, utilization of the fixed seat-backrest angle and linear movement path feature in the existing knee extension machines, do not accommodate the dynamic nature of human motion. This isolation can cause an imbalance in muscle development and places unnatural strain on the knee joint if the user’s posture or alignment is incorrect. Additionally, by focusing solely on the quadriceps, these machines fail to engage the core and other muscle groups that are involved in real-world activities like standing up, walking, and climbing stairs.SUMMARY
[0005] In light of the aforesaid deficiencies of the existing exercise machines, the present invention provides an exercise machine designed to facilitate the simultaneous performance of knee extension and trunk extension exercises. This integrated exercise machine aims to improve overall muscle coordination, balance, and joint function by engaging both lower and upper body in a manner that mimics natural, multi -joints movements. The exercise machineprovides a more comprehensive exercise experience that better reflects the dynamic, coordinated movements required in daily life. This functionality is particularly beneficial for individuals undergoing rehabilitation, those seeking to improve functional strength, or anyone aiming to enhance their overall fitness through integrated, full-body exercises. The result is a more effective, safer, and efficient workout that promotes balanced muscle development, reduces the risk of injury, and supports a higher level of functional mobility.
[0006] An object of the present invention is to provide an exercise machine that allows users to perform knee exercises simultaneously with trunk exercises, allowing for coordinated engagement of lower limb and core muscles, thereby enhancing overall muscle coordination and functional strength.
[0007] Another obj ect of the present invention is to offer an exercise machine that improves biomechanical function by replicating natural, multi -joint movements such as standing up, walking, and climbing stairs, that require integrated activation of quadriceps, trunk, and stabilizing muscles, offering a more functional and comprehensive workout.
[0008] Another object of the present invention is to provide an exercise machine capable of integrating both knee extension and trunk extension exercises into a single machine. This integration promotes balanced development of the upper body, lower body, and core, engaging multiple muscle groups simultaneously for more efficient and comprehensive training.
[0009] A further object of the present invention is to provide an exercise machine that enhances safety and effectiveness of knee extension exercises by reducing risk of unnatural stress on a knee joint, improving posture, and promoting proper alignment through an optimized seat-backrest angle.
[0010] Another object of the present invention is to provide an exercise machine that accommodates a wide range of users, with varying body types, fitness levels, and mobility needs, ensuring proper positioning and muscle engagement during exercise. This ensures inclusivity and accessibility, allowing a broader range of individuals to benefit from the exercise machine, making it more suitable for diverse users within the fitness community.
[0011] Another object of the present invention is to offer an exercise machine that takes a comprehensive approach to fitness, targeting multiple muscle groups within a single machine. This design ensures users can achieve a balanced, effective workout while minimizing the need for multiple pieces of equipment.
[0012] Another objective of the present invention is to support rehabilitation and injury prevention by integrating core and lower-limb activation in a controller manner, therebyhelping users recover from injury by improving muscle imbalances, joint stability, and functional movement patterns.
[0013] A further object of the present is to provide an exercise machine that enables independent adjustments for both the knee and trunk extension exercises. This allows users to modify the intensity of each exercise to suit their fitness level and specific training goals, providing a customizable experience.
[0014] Another object of the present invention is to provide an exercise machine that, unlike conventional equipment requiring multiple exercise machines for different exercises, consolidates a range of exercises into a single, integrated unit. This space-efficient design is ideal for gyms and home fitness environments, offering a comprehensive solution for strength, flexibility, and overall fitness improvement.
[0015] Another object of the present invention is to offer an exercise machine that strengthens and tones multiple muscle groups by closely aligning with human biomechanics. The design facilitates multi-planar movement, allowing users to perform exercises that reflect natural motion patterns and enhance functional strength.
[0016] A further object of the present invention is to improve the overall effectiveness and applicability of knee exercises and trunk extension movements. By offering a more holistic and functional approach, the exercise machine provides a better way to train multiple muscle groups while promoting natural movement patterns.
[0017] Yet still another object of the present invention is to provide an exercise machine that enables users to perform knee exercises while more accurately replicating the natural, integrated movements needed for functional tasks. This improved replication enhances the transferability of strength and coordination to real-world activities.
[0018] The present invention provides an exercise machine designed to support exercises involving both knee and trunk extensions, while promoting proper form and alignment. With adjustable settings, the exercise machine can accommodate users of various sizes and fitness levels, making it both versatile and user-friendly. The exercise machine’s design ensures a smooth, controlled motion that minimizes the risk of injury by maintaining the body’s alignment with functional biomechanics. The exercise machine is adaptable to different users, allowing for a variety of resistance settings to cater to both beginners and advanced athletes. Through consistent use, the exercise machine facilitates improvements in strength, flexibility, posture, and balance, ultimately contributing to better functional movement and physical performance in everyday activities. By combining trunk extension and knee extensionmovements in one machine, the exercise machine overcomes limitations of existing workout solutions, enhancing users’ overall health outcomes. Thus, the exercise machine fulfills a key need in physical therapy while also supporting broader fitness goals through safe and effective training.
[0019] The exercise machine includes a base support that rests securely on a flat surface, and a seat ergonomically designed to provide comfort and support, making it easier for the user to perform exercises while seated. The seat can be adjusted both vertically and horizontally to accommodate users of different sizes and ensure that users can maintain proper form during their workout. This flexibility ensures that users can find an optimal seated position for performing exercises. The exercise machine also includes a leg pad positioned in front of the seat and adapted for users to place ankles under the leg pad while seated. To perform the knee extension exercise, the user begins slowly straightening his legs, focusing on contracting the quadriceps without locking the knees at top. Thereafter, the user holds the extended position for a few seconds, then gradually lower the legs to their initial position.
[0020] In one or more embodiments, the exercise machine can include a first weight stack that provides adjustable resistance for the movement of the leg pad. The weight stack allows users to modify the difficulty of the knee extension exercise based on their fitness level, ensuring a more personalized workout. The first weight stack is connected to the leg pad such that the leg pad only moves when the user actively pushes them using force applied by the legs, thereby providing more control during the knee extension exercise. Once the user releases the force, the leg pad returns to its initial position.
[0021] In one or more embodiments, the exercise machine can include a first range controller that limits angular movement of the leg pad during the knee extension exercise. The first range controller helps ensure the leg pad does not move beyond a safe and comfortable range, protecting the user from injury. The first range controller provides users the ability to fine-tune the motion to match their flexibility and comfort levels, promoting safety and targeted muscle activation. By restricting excessive angular movement of the leg pad, the first range controller also helps reduce the risk of strain during the knee extension exercise and ensures that the knees are not forced into hyperextension. Further, the first range controller can facilitate adjustment of an initial angle of the leg pad to ensure correct form and posture during the knee extension exercise.
[0022] In one or more embodiments, the exercise machine can include a backrest connected at a rear of the seat designed to provide support for the user’s back, in the seated position. Thebackrest moves in a longitudinal direction of the seat based on a pushing load applied by the user, which enables trunk extension exercises. This movement is activated when the user begins the exercise and applies pressure to the backrest as they extend their torso backward. The longitudinal movement of the backrest allows it to follow the natural arc of the user’s spine during the trunk extension exercise. This movement provides personalized support throughout the exercise, preventing excessive strain on the lower back and helping the user maintain proper spinal alignment. As the user pushes against the backrest, it rotates about a transverse axis, along a pivot point, stretching the user’s spine and engaging muscles in the lower back, such as the erector spinae and multifidus.
[0023] In one or more embodiments, the backrest can be fully adjustable in both vertical and horizontal directions, allowing users to position it correctly based on their body size and proportions.
[0024] In one or more embodiments, the backrest can be attached to the seat via a pivotal mechanism. This pivotal mechanism allows the backrest to move either forward or backward in tilting position, as the user applies the force. When the user leans back over the backrest while performing the trunk extension exercise, the backrest rotates along the pivot point, tilting backward to provide continuous support to the lower back and spine as the torso extends. At the same time, the seat can move slightly on a track provided on the seat support to help the user maintain the correct posture as they extend their trunk. This horizontal seat movement ensures that the user stays comfortably supported, and the pivoted backrest continues to align with the user’s spine throughout the exercise.
[0025] Additionally, the user can choose to adjust the seat along the track during the exercise to increase or decrease the depth of their trunk extension. For instance, moving the seat backward allows the user to lean back further, thereby increasing the stretch, while moving the seat forward would limit the range of motion and provide a more controlled extension. As the user completes the extension and returns to the seated position, the pivotal mechanism allows the backrest to tilt forward smoothly. Meanwhile, the seat might also slide back into its neutral position, ensuring the user is supported through the return motion.
[0026] In one or more embodiments, the exercise machine can feature a second weight stack configured to adjust the resistance for rotary movement of the backrest. Similar to the first weight stack, the second weight stack allows users to select the appropriate level of resistance for their trunk extension exercises. The second weight stack can be connected to the backrest to ensure that the backrest moves in the longitudinal direction only when the userapplies the pushing load to it, and the backrest smoothly returns to its starting position once the pushing load is released via angular movement of the backrest along an angular track configured with the pivotal mechanism. This design enables users to perform trunk extension exercises with control, ensuring effective muscle engagement while maintaining safety throughout the trunk extension movement.
[0027] In one or more embodiments, the exercise machine can be equipped with a second range controller configured to limit the range of angular movement for the backrest. The second range controller ensures that the backrest does not move beyond a safe range, preventing excessive motion that could lead to injury. Excessive or uncontrolled movement of the backrest can lead to poor posture, potentially causing strain or injury to the lower back, hips, or other supporting joints of the user. The second range controller thereby mitigates the said risks by facilitating setting a maximum angle of movement, which prevents the backrest from tilting too far, ensuring that users are positioned securely and safely throughout the exercise. This feature is especially useful for beginners, those recovering from injury, or individuals with certain mobility issues, as it ensures that the backrest does not move in a way that could compromise their form or comfort.
[0028] In one or more embodiments, the apparatus may include a third range controller (not shown) configured with the first weight stack to adjust resistance while performing the knee extension exercise. The apparatus may further include a fourth range controller (not shown) configured with the second weight stack to adjust resistance while performing the trunk extension exercise.
[0029] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.
[0031] FIG. 1 illustrates an exemplary perspective view of an exercise machine for facilitating knee extension exercises integrated with trunk extension movements, in accordance with an embodiment of the present invention.
[0032] FIGs. 2 to 4 illustrate additional exemplary perspective views of the exercise machine in accordance with an embodiment of the present invention.DETAILED DESCRIPTION
[0033] The following is a detailed description of embodiments of the invention depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the invention. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
[0034] Embodiments described herein refer to an exercise machine designed to allow users to perform knee extension exercises alongside trunk extension movements, offering an innovative approach to full-body strength training. By targeting both the quadriceps in the legs and the lower back, core, and glutes in the upper body, the exercise machine enhances overall balance, core stability, and posture. The exercise machine allows for independent adjustments of the knee and trunk extension components, ensuring users can tailor the resistance and range of motion to their specific needs. This combination of exercises improves functional strength, making it ideal for athletes, fitness enthusiasts, individuals seeking rehabilitation, or older adults aiming to maintain mobility and strength. It provides a time-saving and versatile solution to strengthening key muscle groups, offering a more efficient workout in less time while reducing the risk of injury and promoting overall body conditioning.
[0035] The exercise machine described here offers significant advantages over conventional fitness equipment by combining knee extension and trunk extension movements into one device. This integration provides a more functional and natural movement pattern, engaging multiple muscle groups to simulate everyday activities such as but not limited to standing-up, climbing-stairs, walking, and the like. Unlike conventional fitness equipment / machines that isolate muscles and mainly depend on fixed movement paths, the proposed machine enhances biomechanical function and reduces the risk of unnatural stress on the knee joint by providing adjustable movement angles. Dual range controllers for both the trunk and knee extension, separate weight stacks for each movement, and variable adjustments in leg and back support ensure a customizable experience for users of various sizes and heights. Additionally, a variable pivot point of the machine offers further adaptability, allowing the users to adjust articulation point according to the specific needs of the exercise.
[0036] FIG. 1 illustrates an exemplary perspective view of an exercise machine 100 designed for facilitating knee extension exercises integrated with trunk extension movements.The exercise machine 100 (referred to as the “machine 100” herein) 100 is equipped with a base support 102 that securely rests on a flat surface, providing a stable foundation for the exercise machine 100. The base support 102 can include a pair of legs 102a, 102b having a first leg 102a and a second leg 102b, where a height of the first leg 102a is greater than a height of the second leg 102b, thereby configuring the base support 102 in an inclined configuration. The exercise machine 100 includes a seat 104 mounted on the base support 102, which supports a user in a seated posture, ensuring ease of use during exercises. The seat 104 can be designed to offer ergonomic support for the user in this seated posture, while also assisting the user in performing dynamic exercises that engage various upper body muscle groups. Additionally, the seat 104 can be equipped with a cushioning layer that enhances comfort and promotes a more relaxed and safe workout experience. This cushioning layer can be designed to support and reduce pressure on the body of a user. Further, the cushioning layer over the seat 104 can help in distributing weight of the user evenly, minimizing discomfort in areas such as lower back and hips, allowing for better posture and form during the exercise.
[0037] In an exemplary embodiment, the seat 104 can be fully adjustable in both vertical and horizontal directions, allowing it to accommodate users of different body sizes and ensuring optimal positioning during exercises. The seat 104 can also be adapted to be adjustable with respect to its inclination angle relative to a horizontal axis, enabling the user to easily customize the seat’s angle based on their body proportions and preferences. The machine 100 also includes a leg pad 118 positioned in front of the seat 104. The leg pad 118 allows the user to place ankles under the leg pad 118 while seated. To perform the knee extension exercise, the user begins slowly straightening his legs, focusing on contracting the quadriceps without locking the knees at top. Thereafter, the user holds the extended position for a few seconds, then gradually lower the legs to their initial position.
[0038] The machine 100 can include a first weight stack 112, which allows the user to adjust the resistance for the movement of the leg pad 118 from its starting position. The first weight stack 112 enables the user to tailor the resistance to their individual fitness levels, providing a personalized workout experience. This allows the user to select the appropriate weight and adjust the resistance encountered by the knee extension exercise.
[0039] In an exemplary embodiment, the first weight stack 112 can be connected to the leg pad 118 via a cable and pulley mechanism. The first weight stack 112 can be connected to the leg pad 118 such that the leg pad 118 only moves when the user actively pushes them usingforce applied by the legs, thereby providing more control during the knee extension exercise. Once the user releases the force, the leg pad 118 returns to its initial position.
[0040] The machine 100 can also include a first range controller 128 configured to govern the range of angular motion of the leg pad 118 along its pre-defined path in the longitudinal direction, moving forward or backward along a main axis of the machine 100. The first range controller 128 serves to restrict the movement of the leg pad 118, ensuring that they do not move beyond a safe and comfortable limit. This feature minimizes the risk of injury while allowing users to fine-tune the range of motion based on their preferences. The first range controller 128 is essential for preventing excessive movement, which could cause discomfort or strain. By providing precise control over the leg pad’s 118 range of motion, the first range controller 128 enhances safety, targets specific muscle groups more effectively, and accommodates users with varying flexibility levels, including those recovering from injuries.
[0041] In an exemplary embodiment, the first range controller 128 can include a pivotally moving member configured for pivotal movement along an axis that is coaxial to the axis of rotation of the leg pad 118, and a selector plate having a plurality of holes. The pivotally moving member includes a lock having a retractable pin configured to lock the pivotally moving member in different angular positions by engaging with a selected hole among the plurality holes of the selector plate. The angularly moving part includes a stopper (not shown), which is located in the same plane as the pivotally moving member such that, during the rotation of the leg pad 118, the stopper engages with the pivotally moving member to block further rotation of the leg pad 118 beyond the selected position. In an embodiment, the exercise machine 100 can include a lever 120 coupled to the first range controller 128. The lever 120 is configured to operate the first range controller 128 to pivotally move the pivotally moving member along the axis that is coaxial to the axis of rotation of the leg pad 118. The lever 120 can be operated by the user to adjust an initial angle of the leg pad 118 to ensure correct form and posture during the knee extension exercise.
[0042] In an embodiment, the exercise machine 100 also includes a backrest 106 which is configured with the seat 104 to support the user back while they are seated. The backrest 106 is mounted at the rear of the seat 104 and is designed to provide support to the user’s back during the exercise. The backrest 106 can be adapted to move away from the seat 104 along a longitudinal direction based on the pushing load exerted by the user. This allows the user to perform trunk extension exercises effectively. The backrest 106 is configured to move hingedlyrelative to the seat 104, rotating about a transverse axis located below the seat 104 as a result of the pushing force applied by the user in a seated posture.
[0043] In an exemplary embodiment, the backrest 106 is fully adjustable in both vertical and horizontal directions to accommodate users of various body sizes, ensuring optimal positioning during exercises. The backrest 106 can also be locked at one or more positions relative to the seat 104, allowing the user to customize its starting position based on their body proportions and preferences.
[0044] The backrest 106 can feature an ergonomically contoured cushion pad designed to follow the natural curvature of the spine. This design helps distribute pressure evenly along the back, providing support to the lower back, mid-back, and upper back during exercises like trunk extensions. The contoured shape ensures that the cushion aligns with the user’s body for maximum comfort and posture support throughout the movement. The cushion pad can be made of material selected from but not limited to high-density foam, memory foam, gel-infused foam, polyurethane foam, Ethylene Vinyl Acetate (EVA) foam, synthetic leather, and the like.
[0045] In an embodiment, the backrest 106 can be attached to the seat 104 via a pivotal mechanism 126. This pivotal mechanism 126 allows the backrest 106 to move either forward or backward in tilting position, as the user applies the force. When the user leans back over the backrest 106 while performing the trunk extension exercise, the backrest 106 rotates along the pivot point, tilting backward to provide continuous support to the lower back and spine as the torso extends. At the same time, the seat 104 can move slightly on track 108 provided on the base support 102 to help the user maintain the correct posture as they extend their trunk. This horizontal seat movement ensures that the user stays comfortably supported, and the pivoted backrest 106 continues to align with the user’s spine throughout the exercise.
[0046] Additionally, the user can choose to adjust the seat 104 along the track 108 configured at the base support 102 during the exercise to increase or decrease the depth of their trunk extension. For instance, moving the seat 104 backward allows the user to lean back further, thereby increasing the stretch, while moving the seat 104 forward would limit the range of motion and provide a more controlled extension. As the user completes the extension and returns to the seated position, the pivotal mechanism 126 allows the backrest 106 to tilt forward smoothly. Meanwhile, the seat 104 might also slide back into its neutral position, ensuring the user is supported through the return motion.
[0047] The backrest 106 can be equipped with a pair of gripping handles 124 (collectively referred as “gripping handles 124” or “handles 124” hereinafter) which are attached to lateralsides of the backrest 106. These handles 124 allow the user to grip them during the exercise for added stability and control. Each handle 124 can include a gripping portion with an anti-skid coating, which helps enhance comfort and safety by providing a secure grip during use. In an embodiment, the handles 124 can be straight horizontal handles, while in some embodiments, the handles 124 can be curved handles. The handles 124 can be designed with an ergonomic contour that fits comfortably in the user’s hand. These handles 124 include a textured grip surface to enhance traction and prevent slipping during exercises. The handles 124 can be coated in high-density foam or rubber for added comfort and grip. This material provides cushioning during exercises and absorbs moisture, reducing slippage.
[0048] The machine 100 can also include a second weight stack 114 that enables the user to adjust the resistance for the rotary movement of the backrest 106 from its starting position. The second weight stack 114 allows the user to tailor the resistance to their individual fitness levels, providing a personalized workout experience. The user can select a specific weight on the second weight stack 114 to modify the resistance encountered by the backrest 106 during the trunk extension movement.
[0049] In an exemplary embodiment, the second weight stack 114 can be connected to the backrest 106 via a cable and pulley mechanism. This setup ensures that the backrest 106 moves in the longitudinal direction only when the user, while seated, applies a sufficient pushing force. When the pushing load is no longer applied, the backrest 106 returns to its starting position, creating a smooth and controlled motion that enhances the effectiveness of the trunk extension movement. This design also adds versatility to the exercise machine 100, allowing users to perform a variety of upper-body strengthening exercises with precise resistance adjustments.
[0050] The machine 100 can also feature a second range controller 129 configured to regulate the range of rotary motion of the backrest 106 about the transverse axis. This second range controller 129 restricts the movement of the backrest 106, ensuring that it does not exceed a safe and comfortable limit. The second range controller 129 is essential for minimizing the risk of injury and provides users with the ability to fine-tune the range of motion of the backrest 106 according to their preferences. By offering precise control over the movement of the backrest 106, the second range controller 129 enhances safety, effectively targets specific muscle groups, and accommodates users with varying flexibility levels or those recovering from injuries. The second weight stack 114 can be connected to the backrest to ensure that the backrest moves in the longitudinal direction only when the user applies the pushing load to it, and the backrest smoothly returns to its starting position once the pushing load is released viaangular movement of the backrest along an angular track 110 configured with the pivotal mechanism 126. This design enables users to perform trunk extension exercises with control, ensuring effective muscle engagement while maintaining safety throughout the trunk extension movement.
[0051] The second range controller 129 can include a set of blocking tracks with a blocking member placed over them. This blocking member contains a first track mounted on a support frame, which guides the rotary movement of the backrest 106 about the transverse axis. The blocking member can feature a set of slots that define and limit the range of motion of the backrest 106. A locking bar, slidably attached to the first track, can be moved along the first track and securely fixed in place by engaging one of these slots. As the user completes the trunk extension movement, the second range controller 129 prevents the backrest 106 from moving beyond the defined limit, ensuring safe and controlled motion throughout the exercise. In an exemplary embodiment, the first range controller 128 and the second range controller 129 can be integrated into a single assembly.
[0052] The first and second weight stacks 112 and 114 provide resistance to the movement of the leg pad 118 and the backrest 106, respectively. This resistance mechanism enables users to transition smoothly between the knee extension and trunk extension movements, ensuring a seamless shift between exercises. By facilitating a smooth transition, the machine 100 reduces the risk of joint strain, promoting a safer and more effective workout. The first 112 and second weight stacks 114 are designed to maintain consistent resistance throughout both exercises, preventing sudden changes in force that could cause discomfort or injury.
[0053] In an embodiment, the first 112 and second weight stacks 114 can be made from durable materials such as steel or heavy-duty plastic, without limitations. Steel offers strength and stability, while plastic or composite materials can provide a lighter, corrosion-resistant option. In some embodiment, each of the first 112 and second weight stacks 114 can include a plurality of weight plates, and a guide rod to facilitate up and down movement of the weight plates without tilting or wobbling. The weight plates can be stacked vertically and can have a central hole that slides onto the guiding rod. This allows the weight plates to move up and down as the resistance is adjusted. The guide rod can be cylindrical shaft that can run parallel to the weight stack and allow the weight plates to slide up and down smoothly. The guide rod can be made from metal and can be designed to be durable and resistant to bending or warping. In some embodiments, the weight stack can include channels or guides to facilitate up and down movement of the weight plates.
[0054] In an embodiment, the exercise machine 100 can include a third range controller (not shown) for the first weight stack 112 to adjust resistance during the knee extension exercise. The third range controller can include a blocking member configured above a weight selector of the first weight stack 112 for sliding movement in a blocking member track. The blocking member track can be located parallel to a weight stack track. The blocking member can include a lock to lock the blocking member in a selected position above the weights such that when the weights is lifted up, an amount of its upward movement of the weights is restricted by the blocking member. The lock for the third range controller for the first weight stack 112 can include a retractable pin provided on the blocking member. The retracted pin, when released, can engage with a selected hole among a plurality of holes provided on a frame of the first weight stack 112 to fix the blocking member, such as a selected height from the weight selector of the weights. In particular, after pulling the pin outwards, the blocking member can be slid along the blocking member track to different positions, such as at the desired distance from the weight selector of the weights, and locked in the position by releasing the pin for locking with a corresponding hole on the frame, for achieving a desired range of motion.
[0055] In an embodiment, the exercise machine 100 can include a fourth range controller (not shown) for the second weight stack 114 to control resistance provided for the trunk extension exercise. The configuration of the fourth range controller is similar to that of the third range controller, providing the user with the ability to selectively adjust the resistance applied during the trunk extension exercise.
[0056] In an exemplary embodiment, the user can begin the integrated workout with the knee extension exercise and transition to the trunk extension movement after completing one full range of motion of the knee extension exercise. To perform the integrated workout, the user can first adjust the seat 104, the leg pad 118, and the backrest 106 to their desired starting positions. After selecting the appropriate resistance levels from the first 112 and second weight stacks 114, the user can engage in the knee extension exercise by activating their quadriceps to extend their knees fully, focusing on controlled movement throughout the entire range of motion. Once they complete one full range of motion for the knee extension, they can smoothly transition into the trunk extension movement by adjusting their posture and engaging their core and lower back muscles. The backrest 106 will tilt backward along the pivotal mechanism 126, providing continuous support to the spine, while the seat 104 can shift slightly on its track to maintain proper alignment and posture. This allows the user to perform the trunk extensionwith proper form, engaging the muscles of the core and lower back while ensuring comfort and safety throughout the exercise.
[0057] In another exemplary embodiment, the user can begin the integrated workout with the trunk extension exercise and transition to the knee extension exercise after completing one full range of motion of the trunk extension exercise. To perform this workout, the user can, after selecting the appropriate resistance levels from the first 112 and second weight stacks 114, engage in the trunk extension exercise by activating their lower back muscles to push the backrest 106 in the longitudinal direction. Once the full range of motion of the trunk extension exercise is completed, i.e., when the backrest 106 is pushed by the user in the longitudinal direction to the maximum extent defined by the second range controller 129 and then moved back to its starting position, the user can transition into the knee extension exercise by activating their quadriceps to push the leg pad 118 in the lateral direction. Thus, the integration of the trunk extension movement with the knee extension movement improves biomechanics, promotes natural spine movement during both movements, and enhances overall health and stability for the user.
[0058] The machine 100 features the adjustable seat 104, leg pad 118, and backrest 106 to cater to the individual anatomical and biomechanical differences of various users. This adjustability ensures that users can modify the positions of the seat 104, the leg pad 118, and the backrest 106 to align with their unique joint mechanics, optimizing comfort and minimizing the risk of strain or injury. By allowing these adjustments, the machine 100 accommodates a wide range of body types and movement styles, ensuring that each user can perform the exercises with proper form and efficiency. The weight stacks are also designed to provide resistance that transition smoothly between the knee extension and trunk extension exercises. This fluid transition minimizes potential joint strain during the shift from one movement to the other. Unlike conventional exercise equipment, which can involve abrupt changes in resistance that can place undue stress on the joints, the machine 100 ensures a seamless transition in the resistance for both the leg pad 118 and the backrest 106, maintaining a safe and effective workout. Additionally, the machine 100 allows for natural spinal movement during both trunk extension and knee extension movements, reducing the likelihood of restricted spine movement that could lead to muscle imbalances or injury over time. Thus, the machine 100 not only enhances the effectiveness of the knee extension exercise but also contributes to better spine health, improving performance in both strength training and daily activities.
[0059] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
Claims
CLAIMS1. An exercise machine (100) for facilitating knee extension exercises integrated with trunk extension movements, comprising:a. a base support (102);b. a seat (104) mounted on the base support (102);c. a leg pad (118) configured to move for performing a knee extension exercise; d. a backrest (106) configured to move relative to the seat (104) along a longitudinal direction based on a pushing load applied by a user to enable trunk extension exercises;e. a first weight stack (112) connected to the leg pad (118) to provide adjustable resistance;f. a second weight stack (114) connected to the backrest (106) to provide adjustable resistance for movement of the backrest (106).
2. The exercise machine (100) of claim 1, wherein the leg pad (118) is positioned in front of the seat (104) and adapted for the user to place ankles under the leg pad (118) while seated.
3. The exercise machine (100) of claim 1, wherein the backrest (106) is mounted at a rear of the seat (104) and configured to provide support to the user’s back.
4. The exercise machine (100) of claim 1, wherein the first weight stack (112) and the second weight stack (114) are connected to the leg pad (118) and the backrest (106), respectively, via a cable and pulley mechanism.
5. The exercise machine (100) of claim 1, further comprising a variable pivot point configured to allow adjustment of an articulation point according to specific needs of the exercise.
6. The exercise machine (100) of claim 1, further comprising a first range controller (128) configured to govern a range of angular motion of the leg pad (118) along a pre-defined path in the longitudinal direction.
7. The exercise machine (100) of claim 6, wherein the first range controller (128) comprises a pivotally moving member configured for movement along an axis coaxial to an axis of rotation of the leg pad (118), and a selector plate having a plurality of holes.
8. The exercise machine (100) of claim 1, further comprising a second range controller (129) configured to regulate a range of rotary motion of the backrest (106) about a transverse axis.
9. The exercise machine (100) of claim 1, wherein the backrest (106) is attached to the seat (104) via a pivotal mechanism (126) that allows the backrest (106) to move forward or backward in a tilting position as the user applies force.
10. The exercise machine (100) of claim 9, further comprising an angular track (110) configured with the pivotal mechanism (126) to guide the backrest (106) back to a starting position once the pushing load is released.
11. The exercise machine (100) of claim 1, further comprising a track (108) provided on the base support (102), wherein the seat (104) is configured to move on the track (108) to maintain correct posture and adjust a depth of the trunk extension.
12. The exercise machine (100) of claim 1, wherein the base support (102) comprises a first leg (102a) and a second leg (102b), where a height of the first leg (102a) is greater than a height of the second leg (102b) to configure the base support (102) in an inclined configuration.
13. The exercise machine (100) of claim 1, wherein the leg pad (118) and the backrest (106) include independent adjustment mechanisms to accommodate users of various sizes and heights.