Quick-release handle assembly for multimodal fitness bars

Abstract

A modular stretching and mobility device includes a center bar coupled to a fabric sheet and equipped with removable handle subassemblies. Each handle subassembly comprises a handle body, opposed release buttons, and a biasing mechanism—such as a leaf spring—configured to urge the release buttons outward for tool-free engagement with corresponding recesses in the center bar. The handle body may include keyed features for orientation control and is optionally configured to receive weighted sleeves or end caps. The system enables rapid swapping of handle variants, secure retention under load, and ergonomic customization for different users and movement patterns.

Description

[0001] This application claims priority to and is a continuation in part of U.S. patent application Ser. No. 19 / 259,849, filed Jul. 3, 2025, which is a continuation of U.S. patent application Ser. No. 18 / 616,045, filed Mar. 25, 2024, which is a continuation of U.S. patent application Ser. No. 17 / 840,519, filed Jun. 14, 2022, issued as U.S. Pat. No. 11,969,620 on Apr. 30, 2024, which is a continuation of U.S. patent application Ser. No. 17 / 238,456, filed Apr. 23, 2021, issued as U.S. Pat. No. 11,383,119 on Jul. 12, 2022, which is a continuation in part of U.S. patent application Ser. No. 17 / 082,451 filed Oct. 28, 2020, issued as U.S. Pat. No. 11,020,625 on Jun. 1, 2021. All extrinsic materials identified in this application are incorporated by reference in their entirety.FIELD OF THE INVENTION

[0002] The field of the invention relates to stretching and mobility devices featuring a compact bar and strap system with removable, customizable handles.BACKGROUND

[0003] The background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided in this application is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[0004] Various approaches to stretching and mobility devices have been described, including those that employ straps, bands, or bars. Certain bar-based systems may integrate fixed grips or provide limited interchangeability through accessory attachments. Their adaptability and ease of use remain subjects of ongoing exploration.

[0005] For example, U.S. patent application Ser. No. 17 / 082,451 (issued as U.S. Pat. No. 11,020,625), describes a multimodal fitness bar that integrates a bar and strap architecture for stretching and resistance exercises. This foundational filing introduced a compact, portable device for a variety of mobility and strength patterns.

[0006] Subsequent improvements, such as those described in U.S. patent application Ser. No. 17 / 840,519 (issued as U.S. Pat. No. 11,969,620), incorporated a heating element into the device, enabling users to enjoy the benefits of heat therapy in conjunction with stretching and resistance movements.

[0007] But none of these prior filings appreciate or address improvements to the device that can be enjoyed by incorporating removable, customizable handles. Existing solutions are constrained by fixed or single-geometry grips that limit ergonomic options across users and movements. Known handle-change mechanisms can require tools, be slow to actuate, or lack robust retention under load. As a result, it can be difficult to transition quickly between different stretching or resisted movement patterns using a single device, and users are unable to tailor grip, comfort, or functionality to their individual needs.

[0008] Accordingly, there is a need in the art for a multimodal stretching device that integrates a compact bar / strap architecture with removable, customizable handle modules. Preferably, the handles can be swapped without tools, retained securely under load, and offered in multiple forms, materials, textures, and sizes to accommodate different user anatomies and exercise modalities, while enabling rapid transitions during a session. The present disclosure addresses these and other shortcomings of the prior art.

[0009] These and all other extrinsic materials discussed in this application are incorporated by reference in their entirety. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided in this application, the definition of that term provided in this application applies and the definition of that term in the reference does not apply.SUMMARY OF THE INVENTION

[0010] In one aspect of the inventive subject matter, systems and methods are provided for a removable handle architecture configured for use with a fitness bar comprising a center bar and a fabric sheet. The handle architecture includes a handle body equipped with opposed release buttons and a biasing mechanism configured to urge the release buttons outward. The release buttons are dimensioned to engage with corresponding recesses formed in the center bar, enabling tool-free installation and removal of the handle. The biasing mechanism may include a leaf spring positioned within the handle body and coupled to both release buttons to provide consistent outward force and secure engagement.

[0011] In some embodiments, the handle body includes an insertion portion with a keyed interface to ensure proper orientation during installation. The release buttons may be configured to provide tactile or audible feedback upon engagement and may be flush with the outer surface of the handle body when fully seated. The handle body may also include a flat surface configured to interface with a corresponding flat surface of the center bar to reduce rotational play.

[0012] In another aspect of the inventive subject matter, the modular handle system may further include an end cap configured to couple to a distal portion of the handle body, such as by pressure fit. The handle body may be formed from polymeric materials with an overmolded grip portion for improved ergonomics, and the release buttons may be precision-molded from acetal or metal alloys to enhance durability and actuation reliability. The spring mechanism may be configured to simultaneously bias both release buttons outward and may be implemented using a leaf spring or other resilient structure.

[0013] Through these and other features, the disclosed handle architecture enables rapid, tool-free swapping of handle variants, secure retention under load, and ergonomic customization for different users and movement patterns.

[0014] One should appreciate that the disclosed subject matter provides many advantageous technical effects including tool-free installation and removal of handles while maintaining secure retention under load. This spring-biased release architecture also facilitates rapid swapping of handle variants and ergonomic customization for different users and movement patterns. It should also be appreciated that the systems and methods of the inventive subject matter do not depend on fixed grip geometries, external tools, or threaded fasteners for handle attachment.

[0015] 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 DRAWING

[0016] FIG. 1 is a perspective view showing a multimodal fitness bar with a fabric sheet and removable handles.

[0017] FIG. 2 shows a bar subassembly with removable handles and end caps.

[0018] FIG. 3 is an exploded view of the bar subassembly illustrating the removable handles separated from the center bar.

[0019] FIG. 4A shows a center bar with wrist-loop accessories exploded away from the ends.

[0020] FIG. 4B shows a center bar with circular-handle accessories exploded away from the ends.

[0021] FIG. 5 shows multiple end-cap variants and a weighted sleeve positioned for installation over a removable handle.

[0022] FIG. 6 shows a removable handle subassembly with opposed release buttons and dual springs that bias the buttons outward.

[0023] FIG. 7A shows a transparent center bar with internal spring mechanisms configured to eject a removable handle.

[0024] FIG. 7B shows the center bar of FIG. 7A in a compressed state after handle insertion.

[0025] FIG. 8 shows a handle with opposed release buttons coupled by a leaf spring to bias the buttons outward.

[0026] FIG. 9 shows a view of the release buttons and leaf spring of FIG. 8.DETAILED DESCRIPTION

[0027] The following discussion provides example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus, if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

[0028] As used in the description in this application and throughout the claims that follow, the meaning of “a,”“an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description in this application, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[0029] Also, as used in this application, and unless the context dictates otherwise, the term “coupled to” is intended to include both direct coupling (in which two elements that are coupled to each other contact each other) and indirect coupling (in which at least one additional element is located between the two elements). Therefore, the terms “coupled to” and “coupled with” are used synonymously.

[0030] Referring to FIG. 1, a multimodal fitness bar 100 includes a center bar 102, a fabric sheet 104 attached to the center bar 102 at a bar attachment interface 106, removable handles 108 coupled to opposite ends of the center bar 102, and modular end caps 110 coupled to the removable handles 108. The fabric sheet 104 includes a heel loop 112 at a distal end, which is sized to receive a user's heel. The sheet 104 can be wrapped under the foot and around the toes to create tension along the posterior chain when the center bar 102 is pulled. In some embodiments, the fabric sheet 104 is detachable from the center bar 102 to facilitate cleaning or replacement.

[0031] In use, a user places a heel in the loop 112 at the end of the fabric sheet 104 and wraps the sheet 104 under the foot. The user grasps the grip portions of handles 108 and draws center bar 102 proximally to establish tension. To change grip type or ergonomics, the user can depress the release buttons 114 to remove a handle 108 and install a different handle variant. To alter loading or balance, the user can select an appropriate end cap 110 or can apply weighted sleeves to the handles 108.

[0032] Removable handles 108 are equipped with spring-loaded release buttons 114 positioned on opposite sides of each handle 108 (as shown in FIG. 3). As a handle 108 is slid into the end portion of center bar 102, spring-biased release buttons 114 within the handle 108 are temporarily depressed inward by the inner surface of the center bar 102. Once the handle 108 is fully seated, the release buttons 114 spring outward into corresponding recesses in the center bar 102, securely locking the handle 108 in place. In some embodiments, a biasing spring within the center bar 102 can be positioned to urge the handle 108 outward when released, providing a “kick-out” ejection for easy removal. By biasing the handles 108 for “kick-out” removals, the handles can also be more securely attached to the center bar 102, reducing apparent wobbling between handles and center bar. The tolerances of the portions of the handles that insert into the center bar are selected to eliminate or nearly eliminate any wobbling or looseness between the handles 108 and the center bar 102. The outer diameter of each portion of a handle 108 is very nearly the same as, but slightly smaller than, the inner diameter of the center bar 102 end portions, creating a tight fit that all but eliminates any wiggling or wobbling during use.

[0033] End caps 110 are modular and couple to the distal ends of removable handles 108. End caps can couple with handles by, e.g., pressure fit. Each end cap 110 includes a cap portion that mates flush with the grip portion of handle 108 and optionally a weight portion received within a hollow interior of the removable handle 108. When installed, the weight portion thus is concealed while the cap portion presents a continuous exterior surface. End caps 110 may be provided in multiple masses, including light, medium, and heavy variants.

[0034] Referring to FIG. 2, a bar subassembly 200 is shown without the fabric sheet, including center bar 202, removable handles 204 coupled to the center bar 202, and end caps 206 coupled to the removable handles 204. Each removable handle 204 is shown concentrically mated with the center bar 202, and each end cap 206 is shown coupled to the distal end of a handle 204.

[0035] FIG. 3 is an exploded view corresponding to FIG. 2, with removable handles 204 separated from center bar 202 to illustrate the handle insertion portions 208, release buttons 210, and corresponding recesses 212 in the center bar 202. As shown, the spring-loaded release buttons 210 are formed such that sliding the handles 204 onto the center bar 202 causes the release buttons 210 to depress, and once they spring back out, the release buttons 210 are biased to snap into recesses 212 in the center bar 202, thereby locking the handles 204 into place. The fit between the outer diameter of the handles 204 and the inner diameter of the center bar 202 end portions is sufficiently tight to eliminate or nearly eliminate any wiggling or wobbling. In some embodiments, the spring-loaded release mechanisms (e.g., release buttons 210) may be integrated into the center bar 202 rather than the handles, with the end portions of the center bar 202 sized and shaped to fit within end portions of handles 204 to provide similar tool-free removal and installation.

[0036] Referring to FIG. 4A, center bar 402 is shown with accessories 404 exploded away from the ends in lieu of removable handles. Accessories 404 include wrist-loop accessories with loops 406 sized for a user's wrists. These accessories use the same release button architecture as the removable handles for tool-free swapping.

[0037] Referring to FIG. 4B, center bar 402 is shown with circular-handle accessories 408 exploded away from the ends, providing a generally ring-shaped grip. Accessories 404 and 408 may use the same spring-loaded release buttons and tight fit as described for the removable handles, above.

[0038] Referring to FIG. 5, multiple end-cap variants are shown, including light end cap 502, medium end cap 510, and heavy end cap 506. Weighted sleeve 508 is shown positioned over a removable handle 504. In some embodiments, the weighted sleeve 508 increases both the effective mass and grip diameter for ergonomic customization. Each end cap can be coupled to the distal end of a removable handle using a pressure fit mechanism, wherein the cap portion is designed to mate flush with the grip portion of the handle, creating a secure connection without the need for tools. The pressure fit allows for quick installation and removal of different end cap variants, enabling the user to easily adjust the mass and balance of the device to their preference.

[0039] Release buttons of the inventive subject matter may be sized and dimensioned to fit within corresponding recesses such that the release buttons are largely flush with the outer diameter of the center bar when handles are fully connected to the center bar. This can prevent accidental removal of a handle. Moreover, having release buttons on opposing sides of a handle also helps to prevent accidental removable by ensuring that even if a single release button is accidentally depressed, there is still a second release button on an opposite side that is unlikely to also be accidentally depressed. Thus, multiple release buttons can be preferable over a single release button, as the redundancy it creates improves functionality and performance.

[0040] Referring to FIG. 6, a partial, enlarged view of a removable handle subassembly 600 is shown. The subassembly includes a handle body 602, opposed release buttons 604, and dual springs 606 that bias the release buttons outward. An inward notch 608 is disposed on the portion of handle body 602 that inserts into the center bar of the inventive subject matter. The inward notch 608 is positioned opposite a flat surface 610 and is configured to engage with a corresponding protrusion or keyed feature within the center bar. This keyed interface ensures that the handle subassembly 600 can only be inserted into the center bar in a single orientation. Such orientation control helps maintain consistent alignment of ergonomic features, such as grip contours or accessory interfaces, and prevents improper installation that could compromise mechanical engagement or user safety.

[0041] Opposite the inward notch 608, a flat surface 610 is formed on the same insertion portion of handle body 602. The flat surface 610 is configured to interface with a corresponding flat or keyed surface within the center bar, thereby minimizing rotational movement between the handle subassembly 600 and the center bar during use. Reducing rotational play can improve user control, enhance safety during resisted movements, and preserve alignment of accessory components such as weighted sleeves or end caps. In some embodiments, the flat surface 610 may also serve as a visual or tactile alignment aid during installation.

[0042] During installation, the release buttons 604 are cammed inward by the interfacing surface of the center bar (not shown in this figure). Once the handle subassembly 600 is fully seated to its designed insertion depth, the release buttons 604 spring back outward under the action of the biasing mechanism and register into corresponding recesses of the center bar, thereby securing the handle against axial withdrawal. Tolerances at the mating interface between the handle body 602 and the bar end are selected to eliminate or nearly eliminate perceptible play during ordinary use.

[0043] Although dual springs 606 are shown in this embodiment, other biasing configurations may be used. In some embodiments, a single spring may be positioned to act on both release buttons 604 simultaneously. In other embodiments, a leaf spring may be employed, coupling the two release buttons 604 together within the handle body 602. A leaf spring configuration can simplify internal architecture, reduce part count, and provide consistent return force across both buttons. The geometry of the release buttons 604 and their cooperating recesses can be configured to provide tactile and / or audible feedback upon full engagement.

[0044] Referring to FIG. 7A, a perspective view of a center bar 700 is shown with a transparent rendering to illustrate internal components that facilitate tool-free retention and ejection of a removable handle. The internal components include spring mechanisms disposed within the end portions of center bar 700. Each spring mechanism comprises a pair of posts 702 that extend axially through a first plate 704 and couple with a second plate 706. A coil spring 708 is concentrically positioned around each post 702 such that the spring 708 is captured between the first plate 704 and the second plate 706.

[0045] The second plate 706 is positioned closer to the open end of center bar 700 and defines an outer surface against which a removable handle abuts upon insertion. The first plate 704 is positioned deeper within the center bar and may be mechanically coupled to the interior wall of center bar 700. In some embodiments, the first plate 704 is press-fit into the center bar until it engages with internal detents or a structural surface that arrests further axial movement. This configuration ensures that the springs 708 remain compressed between the plates during handle installation and provide a consistent biasing force for ejection.

[0046] Using two spring posts 702 instead of a single post can offer several advantages. First, the dual-post configuration distributes the ejection force more evenly across the interface between the handle and center bar, reducing the likelihood of tilting or binding during removal. Second, it provides greater mechanical stability and resistance to off-axis loading, which can occur during dynamic stretching or resisted movements. Third, the redundancy of two springs 708 ensures continued functionality even if one spring experiences fatigue or partial failure over time. This can improve long-term reliability and user safety.

[0047] When the release buttons of the handle are disengaged, the spring mechanisms expand, urging the handle outward from center bar 700 and producing a “kick-out” effect. This feature simplifies removal and enhances usability by reducing the need for manual extraction. The plate-and-post architecture also contributes to improved mechanical engagement by maintaining axial pressure against the handle once installed. This pressure helps eliminate perceptible play between the handle and center bar, improving stability during use.

[0048] Alternative spring configurations may be employed, including wave springs or leaf springs, depending on packaging constraints and desired force characteristics. In some embodiments, the plates 704 and 706 may be integrally formed or mechanically fastened within center bar 700 to ensure consistent alignment and spring performance.

[0049] The transparent depiction of center bar 700 in this figure is intended to illustrate the spatial relationship between the internal spring mechanisms and the bar's end geometry. In practical embodiments, center bar 700 may be fabricated from opaque materials such as aluminum, stainless steel, or reinforced polymers selected for strength, weight, and durability.

[0050] Referring to FIG. 78, a partial cutaway view of center bar 700 is shown, corresponding to the same internal spring mechanism architecture depicted in FIG. 7A, but illustrating the compressed state resulting from insertion of a removable handle. As shown, the second plate 706 is displaced axially toward the first plate 704 due to the abutment of the handle against the outer surface of second plate 706. This compression causes coil springs 708 to store potential energy between the plates, thereby priming the spring mechanisms for ejection.

[0051] The axial displacement of second plate 706 relative to first plate 704 demonstrates the dynamic response of the spring architecture during handle installation. As the handle is inserted into center bar 700, it presses against second plate 706, driving it inward and compressing coil springs 708 around posts 702. Once the handle's release buttons engage with corresponding recesses in the center bar, the spring mechanisms remain in a loaded state. Upon disengagement of the release buttons, the stored energy in coil springs 708 is released, urging second plate 706 outward and producing a “kick-out” effect that assists in handle removal.

[0052] This figure further illustrates the benefit of the dual-post configuration, which maintains parallel alignment between plates 704 and 706 during compression and expansion. This helps prevent tilting or binding of the plates and ensures consistent ejection force across the interface. The internal components remain housed within the end portion of center bar 700, which may be fabricated from opaque structural materials in practical embodiments.

[0053] In some embodiments, the release buttons 604 translate radially within guided apertures formed in the handle body 602, while the dual springs 606 are seated between interior shoulders of the handle body 602 and the inner faces of the release buttons 604 to ensure repeatable return and locking. The geometry of the release buttons 604 and their cooperating recesses can be configured to provide tactile and / or audible feedback upon full engagement.

[0054] Although specific embodiments are shown and described with reference to FIGS. 1-7B, any feature disclosed with respect to one embodiment may be combined with any other disclosed feature where technically feasible. The scope of the disclosure encompasses all such combinations and variations.

[0055] FIG. 8 is a perspective view of a handle subassembly 800 including opposed release buttons 802 and a leaf spring 804 disposed between them. The release buttons 802 are positioned on opposite sides of the handle body and are biased outward by the leaf spring 804 such that, when the handle subassembly 800 is inserted into a center bar, the release buttons 802 are cammed inward by the interfacing surface of the center bar. Upon full insertion, the release buttons 802 spring outward into corresponding recesses in the center bar, thereby securing the handle against axial withdrawal. The leaf spring 804 couples the two release buttons 802 together within the handle body and provides a consistent return force across both buttons. This configuration simplifies internal architecture, reduces part count, and enhances reliability during repeated use. The geometry of the release buttons 802 and their cooperating recesses may be configured to provide tactile and / or audible feedback upon full engagement.

[0056] FIG. 9 is an exploded view of the release button assembly shown in FIG. 8, illustrating the release buttons 802 separated from one another and the leaf spring 804 disposed between them. As shown, the leaf spring 804 is configured to exert outward biasing force on both release buttons 802 simultaneously, enabling tool-free retention and removal of the handle subassembly from the center bar. The release buttons 802 may translate radially within guided apertures formed in the handle body, while the leaf spring 804 is disposed within the handle body and coupled to inner faces of the release buttons 802. This configuration ensures repeatable return and locking performance, while minimizing rotational play and improving mechanical engagement between the handle and center bar.

[0057] A variety of materials may be selected for each component to optimize performance, durability, weight, and user comfort. For example, the center bar may be formed from metals such as aluminum or stainless steel for strength and rigidity, or from high-strength polymers such as reinforced nylon or polycarbonate to reduce weight and enhance corrosion resistance. The removable handles may likewise be constructed from polymers, metals, or composite materials, with outer grip portions optionally overmolded with elastomeric or thermoplastic rubber for improved tactile feel and slip resistance.

[0058] The fabric sheet is preferably fabricated from woven or knitted synthetic fibers—such as nylon, polyester, or aramid blends—to provide tear resistance, flexibility, and ease of cleaning. In some embodiments, natural fibers such as cotton or hemp may be incorporated for softness and breathability. Release buttons and related mechanisms may be precision-molded from acetal, polyoxymethylene, or metal alloys to ensure reliable actuation and wear resistance.

[0059] End caps can be crafted from metals, polymers, or weighted composites, with internal weight elements made from steel, brass, or tungsten to allow for customizable mass. Weighted sleeves may be similarly constructed, using dense metals or engineered polymer blends to finely adjust overall device heft. Accessories such as wrist loops or ring grips can utilize webbing or flexible polymers, reinforced as needed, to balance strength and comfort.

[0060] Through careful selection and combination of these materials, each component of the system can be tailored to meet specific ergonomic, functional, and aesthetic requirements, while maintaining overall durability and performance.

[0061] Accordingly, the described system encompasses specific systems and methods for modular handle and accessory attachment featuring spring-loaded release mechanisms, ergonomic end caps, and customizable weighted sleeves. It will be apparent to those skilled in the art that further modifications—beyond those expressly described—may be implemented without departing from the inventive principles outlined herein. The scope of the invention is therefore defined not by the detailed examples, but by the claims and contexts provided. All terminology, including “comprises” and “comprising,” is intended to be interpreted broadly to encompass non-exclusive combinations of components or steps, allowing for integration with additional features and configurations as technically feasible within the spirit of the disclosure.

Examples

Embodiment Construction

[0027]The following discussion provides example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus, if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

[0028]As used in the description in this application and throughout the claims that follow, the meaning of “a,”“an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description in this application, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[0029]Also, as used in this application, and unless the context dictates otherwise, the term “coupled to” is intended to i...

[0001] This application claims priority to and is a continuation in part of U.S. patent application Ser. No. 19 / 259,849, filed Jul. 3, 2025, which is a continuation of U.S. patent application Ser. No. 18 / 616,045, filed Mar. 25, 2024, which is a continuation of U.S. patent application Ser. No. 17 / 840,519, filed Jun. 14, 2022, issued as U.S. Pat. No. 11,969,620 on Apr. 30, 2024, which is a continuation of U.S. patent application Ser. No. 17 / 238,456, filed Apr. 23, 2021, issued as U.S. Pat. No. 11,383,119 on Jul. 12, 2022, which is a continuation in part of U.S. patent application Ser. No. 17 / 082,451 filed Oct. 28, 2020, issued as U.S. Pat. No. 11,020,625 on Jun. 1, 2021. All extrinsic materials identified in this application are incorporated by reference in their entirety.FIELD OF THE INVENTION

[0002] The field of the invention relates to stretching and mobility devices featuring a compact bar and strap system with removable, customizable handles.BACKGROUND

[0003] The background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided in this application is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[0004] Various approaches to stretching and mobility devices have been described, including those that employ straps, bands, or bars. Certain bar-based systems may integrate fixed grips or provide limited interchangeability through accessory attachments. Their adaptability and ease of use remain subjects of ongoing exploration.

[0005] For example, U.S. patent application Ser. No. 17 / 082,451 (issued as U.S. Pat. No. 11,020,625), describes a multimodal fitness bar that integrates a bar and strap architecture for stretching and resistance exercises. This foundational filing introduced a compact, portable device for a variety of mobility and strength patterns.

[0006] Subsequent improvements, such as those described in U.S. patent application Ser. No. 17 / 840,519 (issued as U.S. Pat. No. 11,969,620), incorporated a heating element into the device, enabling users to enjoy the benefits of heat therapy in conjunction with stretching and resistance movements.

[0007] But none of these prior filings appreciate or address improvements to the device that can be enjoyed by incorporating removable, customizable handles. Existing solutions are constrained by fixed or single-geometry grips that limit ergonomic options across users and movements. Known handle-change mechanisms can require tools, be slow to actuate, or lack robust retention under load. As a result, it can be difficult to transition quickly between different stretching or resisted movement patterns using a single device, and users are unable to tailor grip, comfort, or functionality to their individual needs.

[0008] Accordingly, there is a need in the art for a multimodal stretching device that integrates a compact bar / strap architecture with removable, customizable handle modules. Preferably, the handles can be swapped without tools, retained securely under load, and offered in multiple forms, materials, textures, and sizes to accommodate different user anatomies and exercise modalities, while enabling rapid transitions during a session. The present disclosure addresses these and other shortcomings of the prior art.

[0009] These and all other extrinsic materials discussed in this application are incorporated by reference in their entirety. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided in this application, the definition of that term provided in this application applies and the definition of that term in the reference does not apply.SUMMARY OF THE INVENTION

[0010] In one aspect of the inventive subject matter, systems and methods are provided for a removable handle architecture configured for use with a fitness bar comprising a center bar and a fabric sheet. The handle architecture includes a handle body equipped with opposed release buttons and a biasing mechanism configured to urge the release buttons outward. The release buttons are dimensioned to engage with corresponding recesses formed in the center bar, enabling tool-free installation and removal of the handle. The biasing mechanism may include a leaf spring positioned within the handle body and coupled to both release buttons to provide consistent outward force and secure engagement.

[0011] In some embodiments, the handle body includes an insertion portion with a keyed interface to ensure proper orientation during installation. The release buttons may be configured to provide tactile or audible feedback upon engagement and may be flush with the outer surface of the handle body when fully seated. The handle body may also include a flat surface configured to interface with a corresponding flat surface of the center bar to reduce rotational play.

[0012] In another aspect of the inventive subject matter, the modular handle system may further include an end cap configured to couple to a distal portion of the handle body, such as by pressure fit. The handle body may be formed from polymeric materials with an overmolded grip portion for improved ergonomics, and the release buttons may be precision-molded from acetal or metal alloys to enhance durability and actuation reliability. The spring mechanism may be configured to simultaneously bias both release buttons outward and may be implemented using a leaf spring or other resilient structure.

[0013] Through these and other features, the disclosed handle architecture enables rapid, tool-free swapping of handle variants, secure retention under load, and ergonomic customization for different users and movement patterns.

[0014] One should appreciate that the disclosed subject matter provides many advantageous technical effects including tool-free installation and removal of handles while maintaining secure retention under load. This spring-biased release architecture also facilitates rapid swapping of handle variants and ergonomic customization for different users and movement patterns. It should also be appreciated that the systems and methods of the inventive subject matter do not depend on fixed grip geometries, external tools, or threaded fasteners for handle attachment.

[0015] 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 DRAWING

[0016] FIG. 1 is a perspective view showing a multimodal fitness bar with a fabric sheet and removable handles.

[0017] FIG. 2 shows a bar subassembly with removable handles and end caps.

[0018] FIG. 3 is an exploded view of the bar subassembly illustrating the removable handles separated from the center bar.

[0019] FIG. 4A shows a center bar with wrist-loop accessories exploded away from the ends.

[0020] FIG. 4B shows a center bar with circular-handle accessories exploded away from the ends.

[0021] FIG. 5 shows multiple end-cap variants and a weighted sleeve positioned for installation over a removable handle.

[0022] FIG. 6 shows a removable handle subassembly with opposed release buttons and dual springs that bias the buttons outward.

[0023] FIG. 7A shows a transparent center bar with internal spring mechanisms configured to eject a removable handle.

[0024] FIG. 7B shows the center bar of FIG. 7A in a compressed state after handle insertion.

[0025] FIG. 8 shows a handle with opposed release buttons coupled by a leaf spring to bias the buttons outward.

[0026] FIG. 9 shows a view of the release buttons and leaf spring of FIG. 8.DETAILED DESCRIPTION

[0027] The following discussion provides example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus, if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

[0028] As used in the description in this application and throughout the claims that follow, the meaning of “a,”“an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description in this application, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[0029] Also, as used in this application, and unless the context dictates otherwise, the term “coupled to” is intended to include both direct coupling (in which two elements that are coupled to each other contact each other) and indirect coupling (in which at least one additional element is located between the two elements). Therefore, the terms “coupled to” and “coupled with” are used synonymously.

[0030] Referring to FIG. 1, a multimodal fitness bar 100 includes a center bar 102, a fabric sheet 104 attached to the center bar 102 at a bar attachment interface 106, removable handles 108 coupled to opposite ends of the center bar 102, and modular end caps 110 coupled to the removable handles 108. The fabric sheet 104 includes a heel loop 112 at a distal end, which is sized to receive a user's heel. The sheet 104 can be wrapped under the foot and around the toes to create tension along the posterior chain when the center bar 102 is pulled. In some embodiments, the fabric sheet 104 is detachable from the center bar 102 to facilitate cleaning or replacement.

[0031] In use, a user places a heel in the loop 112 at the end of the fabric sheet 104 and wraps the sheet 104 under the foot. The user grasps the grip portions of handles 108 and draws center bar 102 proximally to establish tension. To change grip type or ergonomics, the user can depress the release buttons 114 to remove a handle 108 and install a different handle variant. To alter loading or balance, the user can select an appropriate end cap 110 or can apply weighted sleeves to the handles 108.

[0032] Removable handles 108 are equipped with spring-loaded release buttons 114 positioned on opposite sides of each handle 108 (as shown in FIG. 3). As a handle 108 is slid into the end portion of center bar 102, spring-biased release buttons 114 within the handle 108 are temporarily depressed inward by the inner surface of the center bar 102. Once the handle 108 is fully seated, the release buttons 114 spring outward into corresponding recesses in the center bar 102, securely locking the handle 108 in place. In some embodiments, a biasing spring within the center bar 102 can be positioned to urge the handle 108 outward when released, providing a “kick-out” ejection for easy removal. By biasing the handles 108 for “kick-out” removals, the handles can also be more securely attached to the center bar 102, reducing apparent wobbling between handles and center bar. The tolerances of the portions of the handles that insert into the center bar are selected to eliminate or nearly eliminate any wobbling or looseness between the handles 108 and the center bar 102. The outer diameter of each portion of a handle 108 is very nearly the same as, but slightly smaller than, the inner diameter of the center bar 102 end portions, creating a tight fit that all but eliminates any wiggling or wobbling during use.

[0033] End caps 110 are modular and couple to the distal ends of removable handles 108. End caps can couple with handles by, e.g., pressure fit. Each end cap 110 includes a cap portion that mates flush with the grip portion of handle 108 and optionally a weight portion received within a hollow interior of the removable handle 108. When installed, the weight portion thus is concealed while the cap portion presents a continuous exterior surface. End caps 110 may be provided in multiple masses, including light, medium, and heavy variants.

[0034] Referring to FIG. 2, a bar subassembly 200 is shown without the fabric sheet, including center bar 202, removable handles 204 coupled to the center bar 202, and end caps 206 coupled to the removable handles 204. Each removable handle 204 is shown concentrically mated with the center bar 202, and each end cap 206 is shown coupled to the distal end of a handle 204.

[0035] FIG. 3 is an exploded view corresponding to FIG. 2, with removable handles 204 separated from center bar 202 to illustrate the handle insertion portions 208, release buttons 210, and corresponding recesses 212 in the center bar 202. As shown, the spring-loaded release buttons 210 are formed such that sliding the handles 204 onto the center bar 202 causes the release buttons 210 to depress, and once they spring back out, the release buttons 210 are biased to snap into recesses 212 in the center bar 202, thereby locking the handles 204 into place. The fit between the outer diameter of the handles 204 and the inner diameter of the center bar 202 end portions is sufficiently tight to eliminate or nearly eliminate any wiggling or wobbling. In some embodiments, the spring-loaded release mechanisms (e.g., release buttons 210) may be integrated into the center bar 202 rather than the handles, with the end portions of the center bar 202 sized and shaped to fit within end portions of handles 204 to provide similar tool-free removal and installation.

[0036] Referring to FIG. 4A, center bar 402 is shown with accessories 404 exploded away from the ends in lieu of removable handles. Accessories 404 include wrist-loop accessories with loops 406 sized for a user's wrists. These accessories use the same release button architecture as the removable handles for tool-free swapping.

[0037] Referring to FIG. 4B, center bar 402 is shown with circular-handle accessories 408 exploded away from the ends, providing a generally ring-shaped grip. Accessories 404 and 408 may use the same spring-loaded release buttons and tight fit as described for the removable handles, above.

[0038] Referring to FIG. 5, multiple end-cap variants are shown, including light end cap 502, medium end cap 510, and heavy end cap 506. Weighted sleeve 508 is shown positioned over a removable handle 504. In some embodiments, the weighted sleeve 508 increases both the effective mass and grip diameter for ergonomic customization. Each end cap can be coupled to the distal end of a removable handle using a pressure fit mechanism, wherein the cap portion is designed to mate flush with the grip portion of the handle, creating a secure connection without the need for tools. The pressure fit allows for quick installation and removal of different end cap variants, enabling the user to easily adjust the mass and balance of the device to their preference.

[0039] Release buttons of the inventive subject matter may be sized and dimensioned to fit within corresponding recesses such that the release buttons are largely flush with the outer diameter of the center bar when handles are fully connected to the center bar. This can prevent accidental removal of a handle. Moreover, having release buttons on opposing sides of a handle also helps to prevent accidental removable by ensuring that even if a single release button is accidentally depressed, there is still a second release button on an opposite side that is unlikely to also be accidentally depressed. Thus, multiple release buttons can be preferable over a single release button, as the redundancy it creates improves functionality and performance.

[0040] Referring to FIG. 6, a partial, enlarged view of a removable handle subassembly 600 is shown. The subassembly includes a handle body 602, opposed release buttons 604, and dual springs 606 that bias the release buttons outward. An inward notch 608 is disposed on the portion of handle body 602 that inserts into the center bar of the inventive subject matter. The inward notch 608 is positioned opposite a flat surface 610 and is configured to engage with a corresponding protrusion or keyed feature within the center bar. This keyed interface ensures that the handle subassembly 600 can only be inserted into the center bar in a single orientation. Such orientation control helps maintain consistent alignment of ergonomic features, such as grip contours or accessory interfaces, and prevents improper installation that could compromise mechanical engagement or user safety.

[0041] Opposite the inward notch 608, a flat surface 610 is formed on the same insertion portion of handle body 602. The flat surface 610 is configured to interface with a corresponding flat or keyed surface within the center bar, thereby minimizing rotational movement between the handle subassembly 600 and the center bar during use. Reducing rotational play can improve user control, enhance safety during resisted movements, and preserve alignment of accessory components such as weighted sleeves or end caps. In some embodiments, the flat surface 610 may also serve as a visual or tactile alignment aid during installation.

[0042] During installation, the release buttons 604 are cammed inward by the interfacing surface of the center bar (not shown in this figure). Once the handle subassembly 600 is fully seated to its designed insertion depth, the release buttons 604 spring back outward under the action of the biasing mechanism and register into corresponding recesses of the center bar, thereby securing the handle against axial withdrawal. Tolerances at the mating interface between the handle body 602 and the bar end are selected to eliminate or nearly eliminate perceptible play during ordinary use.

[0043] Although dual springs 606 are shown in this embodiment, other biasing configurations may be used. In some embodiments, a single spring may be positioned to act on both release buttons 604 simultaneously. In other embodiments, a leaf spring may be employed, coupling the two release buttons 604 together within the handle body 602. A leaf spring configuration can simplify internal architecture, reduce part count, and provide consistent return force across both buttons. The geometry of the release buttons 604 and their cooperating recesses can be configured to provide tactile and / or audible feedback upon full engagement.

[0044] Referring to FIG. 7A, a perspective view of a center bar 700 is shown with a transparent rendering to illustrate internal components that facilitate tool-free retention and ejection of a removable handle. The internal components include spring mechanisms disposed within the end portions of center bar 700. Each spring mechanism comprises a pair of posts 702 that extend axially through a first plate 704 and couple with a second plate 706. A coil spring 708 is concentrically positioned around each post 702 such that the spring 708 is captured between the first plate 704 and the second plate 706.

[0045] The second plate 706 is positioned closer to the open end of center bar 700 and defines an outer surface against which a removable handle abuts upon insertion. The first plate 704 is positioned deeper within the center bar and may be mechanically coupled to the interior wall of center bar 700. In some embodiments, the first plate 704 is press-fit into the center bar until it engages with internal detents or a structural surface that arrests further axial movement. This configuration ensures that the springs 708 remain compressed between the plates during handle installation and provide a consistent biasing force for ejection.

[0046] Using two spring posts 702 instead of a single post can offer several advantages. First, the dual-post configuration distributes the ejection force more evenly across the interface between the handle and center bar, reducing the likelihood of tilting or binding during removal. Second, it provides greater mechanical stability and resistance to off-axis loading, which can occur during dynamic stretching or resisted movements. Third, the redundancy of two springs 708 ensures continued functionality even if one spring experiences fatigue or partial failure over time. This can improve long-term reliability and user safety.

[0047] When the release buttons of the handle are disengaged, the spring mechanisms expand, urging the handle outward from center bar 700 and producing a “kick-out” effect. This feature simplifies removal and enhances usability by reducing the need for manual extraction. The plate-and-post architecture also contributes to improved mechanical engagement by maintaining axial pressure against the handle once installed. This pressure helps eliminate perceptible play between the handle and center bar, improving stability during use.

[0048] Alternative spring configurations may be employed, including wave springs or leaf springs, depending on packaging constraints and desired force characteristics. In some embodiments, the plates 704 and 706 may be integrally formed or mechanically fastened within center bar 700 to ensure consistent alignment and spring performance.

[0049] The transparent depiction of center bar 700 in this figure is intended to illustrate the spatial relationship between the internal spring mechanisms and the bar's end geometry. In practical embodiments, center bar 700 may be fabricated from opaque materials such as aluminum, stainless steel, or reinforced polymers selected for strength, weight, and durability.

[0050] Referring to FIG. 78, a partial cutaway view of center bar 700 is shown, corresponding to the same internal spring mechanism architecture depicted in FIG. 7A, but illustrating the compressed state resulting from insertion of a removable handle. As shown, the second plate 706 is displaced axially toward the first plate 704 due to the abutment of the handle against the outer surface of second plate 706. This compression causes coil springs 708 to store potential energy between the plates, thereby priming the spring mechanisms for ejection.

[0051] The axial displacement of second plate 706 relative to first plate 704 demonstrates the dynamic response of the spring architecture during handle installation. As the handle is inserted into center bar 700, it presses against second plate 706, driving it inward and compressing coil springs 708 around posts 702. Once the handle's release buttons engage with corresponding recesses in the center bar, the spring mechanisms remain in a loaded state. Upon disengagement of the release buttons, the stored energy in coil springs 708 is released, urging second plate 706 outward and producing a “kick-out” effect that assists in handle removal.

[0052] This figure further illustrates the benefit of the dual-post configuration, which maintains parallel alignment between plates 704 and 706 during compression and expansion. This helps prevent tilting or binding of the plates and ensures consistent ejection force across the interface. The internal components remain housed within the end portion of center bar 700, which may be fabricated from opaque structural materials in practical embodiments.

[0053] In some embodiments, the release buttons 604 translate radially within guided apertures formed in the handle body 602, while the dual springs 606 are seated between interior shoulders of the handle body 602 and the inner faces of the release buttons 604 to ensure repeatable return and locking. The geometry of the release buttons 604 and their cooperating recesses can be configured to provide tactile and / or audible feedback upon full engagement.

[0054] Although specific embodiments are shown and described with reference to FIGS. 1-7B, any feature disclosed with respect to one embodiment may be combined with any other disclosed feature where technically feasible. The scope of the disclosure encompasses all such combinations and variations.

[0055] FIG. 8 is a perspective view of a handle subassembly 800 including opposed release buttons 802 and a leaf spring 804 disposed between them. The release buttons 802 are positioned on opposite sides of the handle body and are biased outward by the leaf spring 804 such that, when the handle subassembly 800 is inserted into a center bar, the release buttons 802 are cammed inward by the interfacing surface of the center bar. Upon full insertion, the release buttons 802 spring outward into corresponding recesses in the center bar, thereby securing the handle against axial withdrawal. The leaf spring 804 couples the two release buttons 802 together within the handle body and provides a consistent return force across both buttons. This configuration simplifies internal architecture, reduces part count, and enhances reliability during repeated use. The geometry of the release buttons 802 and their cooperating recesses may be configured to provide tactile and / or audible feedback upon full engagement.

[0056] FIG. 9 is an exploded view of the release button assembly shown in FIG. 8, illustrating the release buttons 802 separated from one another and the leaf spring 804 disposed between them. As shown, the leaf spring 804 is configured to exert outward biasing force on both release buttons 802 simultaneously, enabling tool-free retention and removal of the handle subassembly from the center bar. The release buttons 802 may translate radially within guided apertures formed in the handle body, while the leaf spring 804 is disposed within the handle body and coupled to inner faces of the release buttons 802. This configuration ensures repeatable return and locking performance, while minimizing rotational play and improving mechanical engagement between the handle and center bar.

[0057] A variety of materials may be selected for each component to optimize performance, durability, weight, and user comfort. For example, the center bar may be formed from metals such as aluminum or stainless steel for strength and rigidity, or from high-strength polymers such as reinforced nylon or polycarbonate to reduce weight and enhance corrosion resistance. The removable handles may likewise be constructed from polymers, metals, or composite materials, with outer grip portions optionally overmolded with elastomeric or thermoplastic rubber for improved tactile feel and slip resistance.

[0058] The fabric sheet is preferably fabricated from woven or knitted synthetic fibers—such as nylon, polyester, or aramid blends—to provide tear resistance, flexibility, and ease of cleaning. In some embodiments, natural fibers such as cotton or hemp may be incorporated for softness and breathability. Release buttons and related mechanisms may be precision-molded from acetal, polyoxymethylene, or metal alloys to ensure reliable actuation and wear resistance.

[0059] End caps can be crafted from metals, polymers, or weighted composites, with internal weight elements made from steel, brass, or tungsten to allow for customizable mass. Weighted sleeves may be similarly constructed, using dense metals or engineered polymer blends to finely adjust overall device heft. Accessories such as wrist loops or ring grips can utilize webbing or flexible polymers, reinforced as needed, to balance strength and comfort.

[0060] Through careful selection and combination of these materials, each component of the system can be tailored to meet specific ergonomic, functional, and aesthetic requirements, while maintaining overall durability and performance.

[0061] Accordingly, the described system encompasses specific systems and methods for modular handle and accessory attachment featuring spring-loaded release mechanisms, ergonomic end caps, and customizable weighted sleeves. It will be apparent to those skilled in the art that further modifications—beyond those expressly described—may be implemented without departing from the inventive principles outlined herein. The scope of the invention is therefore defined not by the detailed examples, but by the claims and contexts provided. All terminology, including “comprises” and “comprising,” is intended to be interpreted broadly to encompass non-exclusive combinations of components or steps, allowing for integration with additional features and configurations as technically feasible within the spirit of the disclosure.

Examples

Embodiment Construction

[0027]The following discussion provides example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus, if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

[0028]As used in the description in this application and throughout the claims that follow, the meaning of “a,”“an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description in this application, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[0029]Also, as used in this application, and unless the context dictates otherwise, the term “coupled to” is intended to i...

Claims

1. A removable handle subassembly for a fitness device comprising a center bar and a fabric sheet coupled to the center bar, the removable handle subassembly comprising:a handle body;a pair of release buttons disposed on opposite sides of the handle body; anda biasing member coupled to the release buttons and configured to urge the release buttons outward.

2. The removable handle subassembly of claim 1, wherein the biasing member comprises a leaf spring.

3. The removable handle subassembly of claim 1, wherein the release buttons are configured to engage with recesses formed in the center bar.

4. The removable handle subassembly of claim 1, wherein the release buttons are flush with an outer surface of the handle body when fully engaged.

5. The removable handle subassembly of claim 1, wherein the biasing member is positioned within the handle body.

6. A handle assembly for a fitness bar comprising a center bar and a fabric sheet, the handle assembly comprising:a handle body having an insertion portion;a pair of release buttons disposed on the insertion portion;a leaf spring configured to bias the release buttons outward into engagement with corresponding recesses of the center bar; anda spring mechanism disposed within an end portion of the center bar, the spring mechanism comprising a pair of posts extending through a first plate and coupled to a second plate, with coil springs concentrically positioned around the posts and captured between the plates, wherein the spring mechanism is configured to urge the handle body outward from the center bar when the release buttons are disengaged.

7. The handle assembly of claim 6, wherein the insertion portion includes a keyed interface for orientation control.

8. The handle assembly of claim 6, wherein the leaf spring is seated between interior shoulders of the handle body and inner faces of the release buttons.

9. The handle assembly of claim 6, wherein the release buttons provide tactile feedback upon engagement.

10. The handle assembly of claim 6, wherein the handle body includes a flat surface configured to interface with a corresponding flat surface of the center bar.

11. A modular handle system for use with a fitness bar comprising a center bar and a fabric sheet, the modular handle system comprising:a handle body;a pair of radially translating release buttons;a spring mechanism configured to simultaneously bias both release buttons outward; andan end cap configured to couple to a distal portion of the handle body.

12. The modular handle system of claim 11, wherein the spring mechanism comprises a leaf spring.

13. The modular handle system of claim 11, wherein the release buttons are configured to be cammed inward during insertion into the center bar.

14. The modular handle system of claim 11, wherein the handle body is formed from a polymer with an overmolded grip portion.

15. The modular handle system of claim 11, wherein the release buttons are precision-molded from acetal or metal alloy.

16. The modular handle system of claim 11, wherein the spring mechanism is configured to provide audible feedback upon engagement.

17. The modular handle system of claim 11, wherein the handle body is configured to eliminate perceptible play when coupled to the center bar.

18. The modular handle system of claim 11, wherein the end cap couples with the handle body by pressure fit.

Images