US20240261621A1

US20240261621A1 - Weight Plate Comprising a Rotating Center Mechanism

Info

Publication number: US20240261621A1
Application number: US18/435,195
Authority: US
Inventors: Felix Tolosa
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-02-07
Filing date: 2024-02-07
Publication date: 2024-08-08

Abstract

The present invention introduces a groundbreaking advancement in strength training equipment, featuring a uniquely designed weight plate with an integrated rotating center mechanism. This innovative mechanism allows each weight plate to maintain a consistent orientation relative to the barbell sleeve, irrespective of the barbell's rotation during various exercises. This functionality significantly reduces the transmission of rotational forces to the athlete, thereby enhancing both safety and performance. A key aspect of this invention is the incorporation of removable weight plate spacers, which create an air gap between adjacent weight plates, enabling their independent rotation and offering versatility for a wide range of strength training exercises. Additionally, the invention includes a variable-depth bearing adapter, making it adaptable for compatibility with weight plates of varying thicknesses and bearings of different sizes. Overall, this invention presents a novel solution to challenges in current strength training practices, setting a new standard in weightlifting technology.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This non-provisional patent application claims the benefit of U.S. Provisional Patent Application No. 62/63443948, filed on Feb. 7, 2024, pursuant to 35 U.S.C. 119(e).

FIELD OF THE INVENTION

The present general inventive concept relates to strength training equipment and more particularly to a strength training weight plate having a rotating center mechanism and related weight plate spacers.

BACKGROUND OF THE INVENTION

The existing technology in the realm of weight training equipment primarily consists of standard weight plates, which are mounted on barbells for various strength training exercises. These conventional weight plates typically have a static center insert, which does not rotate independently of the barbell sleeve. This design flaw can lead to the direct transfer of rotational force from the barbell to the user, increasing the risk of injuries and reducing workout effectiveness, especially in exercises that involve significant barbell rotation like Olympic weightlifting clean and jerks, and snatches.
In an attempt to address this issue, some barbells are designed with rotating sleeves that incorporate bearings or bushings, allowing the sleeves to spin independently of the barbell shaft. However, these solutions present several limitations. First, the quality and effectiveness of such rotating sleeves vary widely, and even high-quality bearings in barbell sleeves are not entirely frictionless. Second, barbells with different sleeve rotation properties can be expensive and space-consuming, making them impractical for many gym owners and home fitness enthusiasts. Lastly, the use of multiple weights on the same barbell sleeve leads to a disparity in rotational inertia, introducing unpredictability and instability in the workouts.
Accordingly, there is a need for a solution that enables the use of weight plates with the existing equipment infrastructure of the industry but reduces the chance of injury caused by unpredictable rotational forces. By further separating the weight training participant from rotational forces during the apparatus turnover phase of exercise, fatigue and injuries that are susceptible to these forces can be reduced.
Related art disclosure includes a ‘Short Dumbbell’, U.S. Pat. No. 10,729,928B2. The ‘Short Dumbbell’ is an approach to dumbbell design, primarily focused on the readability of labels on the dumbbell cap through a gravity-assisted rotating flywheel. While it introduces a novel concept in dumbbell functionality, its primary focus is not on enhancing the exercise effectiveness or safety but rather on the visual and informational aspect of the equipment.

SUMMARY

The present invention aims to overcome these drawbacks by introducing a novel weight training apparatus that incorporates a rotating center mechanism within each weight plate, allowing each plate to maintain its orientation independently of the barbell sleeve. This design significantly reduces the rotational forces transmitted to the user, enhancing both safety and performance. Additionally, the invention includes removable weight plate spacers that create an air gap between weight plates, enabling free rotation of each plate and offering a versatile solution for a wide range of exercises. The invention also features a variable-depth bearing adapter for compatibility with plates of varying thicknesses and bearings of different sizes. By addressing the specific challenges and limitations inherent in existing strength training equipment, this invention represents a significant progression in strength training technology.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following detailed portion of the present description, the teachings of the present application will be explained in more detail with reference to the example embodiments shown in the drawings, in which:

FIG. 1 presents a front view of an embodiment of the rotating center mechanism encased within a thin bumper plate, demonstrating the integration of the mechanism within the plate structure.

FIG. 2 offers an enlarged front view of the rotating center mechanism shown in FIG. 1 .

FIG. 3 depicts the thin bumper plate of FIG. 1 in a top-front-right isometric view, showcasing the overall design and external appearance.

FIG. 4 illustrates the same bumper plate as in FIG. 1 , viewed from a top-back-right isometric perspective, to provide a comprehensive understanding of its design.

FIG. 5 reveals an exploded top-back-right isometric view of the bumper plate from FIG. 1 , detailing the internal components and assembly structure.

FIG. 6 shows an exploded top-front-right isometric view of the bumper plate from FIG. 1 , further elucidating the arrangement and interaction of the various components.

FIG. 7 displays a partially assembled top-back-right isometric view of the bumper plate in FIG. 1 , providing insight into the assembly process.

FIG. 8 features a mostly assembled top-back-right isometric view of the bumper plate from FIG. 1 , illustrating the near-complete assembly of the components.

FIG. 9 illustrates a front view of an embodiment of the rotating center mechanism within a thick bumper plate, excluding screws for clarity.

FIG. 10 presents an exploded top-front-right isometric view of the bumper plate from FIG. 9 , showing the disassembled components.

FIG. 11 offers an exploded top-back-right isometric view of the bumper plate in FIG. 9 , highlighting the different layers and elements.

FIG. 12 depicts an isolated top-front-right isometric view of a thin rotating center mechanism from FIG. 1 , excluding screws, to focus on the mechanism itself.

FIG. 13 shows a right-side view of the rotating center mechanism from FIG. 12 , providing a side perspective.

FIG. 14 displays an exploded top-front-right isometric view of the rotating center mechanism from FIG. 12 , detailing its individual components.

FIG. 15 features an exploded top-back-right isometric view of the rotating center mechanism in FIG. 12 , further illustrating the assembly.

FIG. 16 presents an isolated top-front-right isometric view of a thick rotating center mechanism from FIG. 9 , focusing on the mechanism in a stand-alone setting.

FIG. 17 shows an exploded top-front-right isometric view of the rotating center mechanism from FIG. 16 , detailing its disassembled state.

FIG. 18 provides an exploded top-back-right isometric view of the rotating center mechanism in FIG. 16 , offering a different perspective of its components.

FIG. 19 illustrates an alternate embodiment of the rotating center mechanism as shown in FIG. 1 , highlighting a different screw hole configuration, with screws omitted for clarity.

FIG. 20 presents an exploded top-front-right isometric view of the alternate rotating center mechanism from FIG. 19 .

FIG. 21 shows an exploded top-back-right isometric view of the alternate rotating center mechanism in FIG. 19 .

FIG. 22 depicts an alternate embodiment of the rotating center mechanism introduced in FIG. 9 , highlighting bearings with a grooved/threaded outside diameter, excluding screws.

FIG. 23 offers a right-side view of the alternate rotating center mechanism from FIG. 22 , providing a side perspective.

FIG. 24 displays an exploded top-front-right isometric view of the alternate rotating center mechanism in FIG. 22 .

FIG. 25 features an alternate embodiment of the rotating center mechanism from FIG. 1 , highlighting a bearing with a metallic attachment to its outside diameter, excluding screws, presented in an isolated top-front-right isometric view.

FIG. 26 shows an exploded top-front-right isometric view of the alternate rotating center mechanism from FIG. 25 .

FIG. 27 presents a top-front-right isometric view of an example embodiment of a bearing used in the rotating center mechanism as shown in FIG. 1 and FIG. 9 , with shields/seals omitted for clarity.

FIG. 28 illustrates a front view of the bearing as shown in the example embodiment in FIG. 27 .

FIG. 29 depicts a front view of an example embodiment of a barbell, showcasing the barbell's design and structure.

FIG. 30 offers a top-back-right isometric view of the barbell from FIG. 29 , providing a complete view.

FIG. 31 displays an embodiment of bumper plates with a rotating center mechanism, as shown in FIG. 1 and FIG. 9 , mounted on a barbell from FIG. 29 , including bumper plate spacers and collars, presented in front view.

FIG. 32 shows the assembly from FIG. 31 in a top-front-right isometric view, illustrating the full setup.

FIG. 33 features an enlarged front view of the assembly in FIG. 31 , emphasizing the integration of components.

FIG. 34 presents an enlarged top-front-right isometric view of the assembly from FIG. 31 , offering a detailed perspective.

FIG. 35 displays an enlarged top-back-right isometric view of the assembly in FIG. 31 , further detailing the configuration.

FIG. 36 illustrates a front view of an embodiment of bumper plates with a rotating center mechanism, as shown in FIG. 1 and FIG. 9 , mounted on a barbell from FIG. 29 , including collars but excluding bumper plate spacers.

FIG. 37 shows the assembly from FIG. 36 in a top-front-right isometric view.

FIG. 38 presents an enlarged front view of the assembly in FIG. 36 , for a closer look at the arrangement.

FIG. 39 offers an enlarged top-front-right isometric view of the assembly from FIG. 36 .

FIG. 40 features an enlarged top-back-right isometric view of the assembly in FIG. 36 .

FIG. 41 depicts a top-front-right isometric view of an embodiment of a bumper plate spacer, as used in FIG. 33 .

FIG. 42 illustrates a right-side view of the bumper plate spacer from FIG. 41 .

FIG. 43 presents a front view of the bumper plate spacer from FIG. 41 .

FIG. 44 shows an athlete at the starting or setup position of an Olympic weightlifting snatch exercise, using weight plates with a rotating center mechanism.

FIG. 45 illustrates the athlete from FIG. 44 performing the explosion phase of the snatch exercise to generate upward momentum of the barbell, using weight plates with a rotating center mechanism. This explosive movement is what propels the barbell into the air.

FIG. 46 features the athlete from FIG. 45 completing the explosion phase and transitioning into the overhead catch phase with the arms fully extended and stabilized overhead, and preparing to standup with the barbell to successfully complete the lift, using weight plates with a rotating center mechanism.

FIG. 47 depicts an athlete attempting a snatch exercise using standard weight plates but is having difficulty stabilizing the barbell overhead.

FIG. 48 shows the athlete from FIG. 47 failing to stabilize and dropping the barbell using standard weight plates, leading to potential injury.

FIG. 49 illustrates an exploded view of the present general inventive concept according to an alternative embodiment.

FIG. 50 illustrates a front perspective view of the present general inventive concept according to FIG. 49 .

DESCRIPTION OF THE INVENTION

Introduction

The present invention heralds a significant advancement in the field strength training equipment, introducing a weight plate with a novel rotating center mechanism (101). Its unique design allows each weight plate (102) to independently maintain its orientation relative to the barbell sleeve (103), thus mitigating the rotational forces typically transmitted to the barbell shaft (104) and, by extension, to the trainee. This innovative concept redefines conventional weight training methods, infusing them with enhanced functionality, safety, and adaptability. The detailed description provided herein, complemented by illustrative figures, is crafted to enable those skilled in the art to fully grasp, replicate, and exploit the innovation's unique features.
Central to the motivation behind this invention is the recognition of specific limitations and challenges inherent in current weight training equipment. Traditional weight plates, typically loaded to a barbell sleeve (103) and static, present a fundamental drawback during exercises involving rotation of the barbell shaft (104), such as bicep curls or Olympic weightlifting exercises like clean and jerks and snatches (126). When the barbell shaft's (104) rotation comes to a halt at the end of a rep, the conventional design results in the direct transmission of rotational force to the user, increasing the risk of injuries (127) and compromising the effectiveness of the workout. Such issues are particularly pronounced in high intensity training environments, including Olympic weightlifting and CrossFit gyms, where the dynamic nature of exercises demands equipment that can safely and efficiently accommodate rapid and forceful movements.
The existing solutions in the market, while attempting to mitigate these challenges, reveal substantial inadequacies. For instance, the integration of bushings or bearings within barbell sleeves (103) that allow the sleeves (103) to spin independently of the barbell shaft (104), a common remedy for reduction of rotational force transfer, varies significantly in quality and effectiveness. High-quality bearing sleeves, although reducing the transfer of rotational force to some extent, are not entirely frictionless and can be prohibitively expensive for gym owners or home gym enthusiasts. Purchasing multiple barbells (105) with different sleeve (103) rotation properties to suit a trainee's needs can be cost and space prohibitive. Additionally, the disparity in rotational inertia between heavier and lighter weights on the same barbell sleeve (103) introduces unpredictability and instability in workouts, posing a challenge for athletes aiming to achieve precise and controlled lifts.
By addressing these specific use cases and limitations, this invention not only fills a crucial gap in the strength training equipment market but also sets a new benchmark for safety and efficiency. The introduction of the rotating center mechanism (101) in weight plates (102) represents a paradigm shift, offering a solution that directly tackles the problems posed by the rotational dynamics of traditional weightlifting practices.

Composition and Material Selection

The composition of the weight plate (102) is central to the effectiveness of this invention. The plate (102) is primarily constructed from rubber or urethane (122), materials chosen for their durability, shock absorption capabilities, and longevity. Optionally, the inclusion of a steel or iron core can be used to augment the mass and structural integrity of the weight plate (102). These attributes are critical for withstanding the high-impact and rigorous demands typically encountered in Olympic weightlifting and CrossFit gyms.
Moreover, the moldability of these materials plays a vital role in the seamless integration of the rotating center mechanism (101). The materials' inherent properties allow for the creation of weight plates (102) that can accommodate the innovative rotating center mechanism (101) while maintaining the necessary strength and resilience. This is particularly important as the mechanism (101) involves moving parts and bearings (106), which require precise alignment and integration within the weight plate (102).
FIGS. 1-11 and 19-40 illustrate the interplay between the chosen materials and the rotating center mechanism (101). These figures provide visual aids to better understand how the materials contribute to the overall design and functionality of the weight plate (102).

Integration With ‘Bumper’ Plates

A key aspect of this invention lies in its integration with rubber or urethane (122) weight plates (102), characteristically called bumper plates (102), a staple in dynamic strength training environments. Bumper plates (102) are a type of weight plate (102) distinguished by their resilience and ability to withstand significant drops without damaging the floor or the plate itself. One of the ways that sets bumper plates (102) apart from iron plates is their unique design feature: a consistent outer diameter of approximately 450 mm (107) across different weights, achieved by varying the plate's (102) thickness rather than its overall diameter. This standardization in diameter (0067), irrespective of weight, allows for a distribution of load during floor impact when dropped and is crucial in environments such as Olympic weightlifting and CrossFit gyms where dropping a loaded barbell (110) from neck or overhead height is common.
The invention's rotating center mechanism (101) has been innovatively designed to complement this distinctive attribute of bumper plates (102). It is adeptly engineered to accommodate bumper plates (107) of various thicknesses, thus significantly broadening its applicability across diverse weight training regimes. For thicker weight plates (108), typically used in heavier lifting and high impact drop scenarios, the rotating center mechanism (101) incorporates a design capable of accommodating a wider bearing or two adjacent bearings (111), as shown in FIGS. 10-11 and 16-18 . This adaptability is crucial for ensuring durability under increased mass and the expected impacts from higher drops during routines such as Olympic-style lifts.
The integration is illustrated in FIGS. 3, 4, and 5 , which demonstrate how the rotating center mechanism (101) is incorporated into bumper plates (102) of varying thicknesses. These figures provide a visual understanding of the mechanism's (101) adaptability, showcasing its ability to function seamlessly with bumper plates (102), whether they are lighter and thinner (109) or heavier and thicker (108). This compatibility is vital for maintaining the standardized diameter (107) of bumper plates (102) while introducing the innovative feature of autonomous rotation, thereby enhancing the functionality and safety of the weight plates (102).
Furthermore, this integration significantly contributes to the overall effectiveness of the training equipment. By enabling bumper plates (102) to maintain their independent orientation relative to the barbell sleeve (103), the rotating center mechanism (101) effectively reduces the rotational forces transmitted to the barbell shaft (104) during exercises. This feature is particularly beneficial in dynamic lifting exercises, where controlling the rotational force is crucial for performance optimization and injury prevention.
In essence, the integration with bumper plates (102) underscores the invention's commitment to enhancing the safety, efficiency, and adaptability of strength training equipment. It represents a thoughtful response to the specific demands of high-intensity training environments, where the robustness of equipment and the safety of athletes are paramount. This integration not only improves the safety and efficiency of exercises but also expands the utility and applicability of bumper plates (102) in various training contexts.

The Rotating Center Mechanism

At the core of this invention is the rotating center mechanism (101), a novel feature that fundamentally changes the dynamics of weight plates (102) in strength training. This mechanism (101), detailed in FIGS. 1, 2, 12-18, and 27-28 , allows each weight plate (102) to maintain its orientation independently of the barbell sleeve (103). This independence is crucial for reducing the rotational forces exerted on the barbell shaft (104) and subsequently on the user's joints during exercises that involve significant barbell shaft (104) rotation.
The rotating center mechanism (101) is primarily composed of a deep groove ball bearing (106), known for its efficiency in facilitating smooth and controlled rotation. It features outer (112) and inner rings (113), separated by rolling elements (114), all machined for optimal rotational performance. This specification, as shown in FIGS. 27 and 28 , ensures smooth and consistent rotation, which is critical for the functionality of the weight plates (102). However, the design is versatile enough to accommodate various types of bearings, such as cylindrical roller bearings, needle roller bearings, etc., which can be selected based on specific requirements such as load-bearing capacity and the desired level of rotational smoothness. This adaptability ensures that the weight plates (102) can be customized for different training needs and preferences.
The inclusion of the rotating mechanism (101) represents a significant improvement over traditional weight plates, where the center insert is static and affixed, leading to the direct transfer of rotational force to the user. Such a design increases the risk of joint injuries and reduces the effectiveness of the workout. By contrast, the rotating center mechanism (101) mitigates these issues, providing a safer and more efficient training experience. Even if used with high-end barbells equipped with premium sleeve bearings, the weight plate (102) with a rotating center mechanism (101) adds a second layer of rotational force isolation, enhancing protection against rotational force transfer that would currently be impossible. It is particularly advantageous in exercises like Olympic lifts, where controlling rotational force is essential for both performance and safety.

Technical Advancements

The weight plate (102) with a rotating center mechanism (101) embodies several technical advancements that significantly elevate its functionality and utility compared to what is currently available in the realm of strength training equipment. These advancements, illustrated in FIGS. 19-20 and 22-26 , showcase the engineering that sets this invention apart.
At the forefront of these technical advancements is the variable-depth bearing adapter (115), a key piece of the rotating center mechanism (101) that enables its integration into weight plates (102) of various thicknesses. This two-piece metal adapter (115) consists of a flanged cylinder and a corresponding cylinder cap, detailed in FIG. 12-15 . The flanged cylinder is designed to fit snugly within the inner ring of the bearing (113), with the flange serving to abut to the bearing inner ring's exterior face, and the cylinder cap securely encasing the opposite end while also abutting to the bearing inner ring's opposing exterior face. The two-piece variable-depth bearing adapter (115) is then secured together through way of a countersunk through-hole pattern on one side and blind tapped holes on the other. An alternate hole pattern displayed in FIG. 19-21 has the tapped holes on the face of the adapter (115). The adapter's (115) ability to accommodate weight plates (102) of different depths (108,109) and bearings (106) with different inner ring diameters adds a layer of versatility.
Moreover, the variable-depth bearing adapter (115) serves a crucial role in enhancing the bearing's (106) longevity and operational effectiveness. By fitting through the diameter of the bearing's inner ring (113), it reduces the inner diameter to approximately 50.4 mm (116) to accommodate an Olympic barbell sleeve (103) of approximately 50 mm outer diameter (117) without any lateral play or wobble during lifts. This fit is critical in striking a balance between ease of loading and maintaining the bearing's integrity, ensuring reliable, consistent rotation during use.
Additionally, this invention preferably employs retention disks (118), as highlighted in FIG. 1-11 , which play a vital role in securing the rotating center mechanism (101) within the weight plate (102). These disks (118) form a protective barrier against external contaminants, stabilize the rotating center mechanism (101) in the weight plate (102) and protect it from shifting while in use, safeguarding the assembly and ensuring uninterrupted operation. Retention disks (118) are placed on opposite sides of the rotating center mechanism (101) and screwed together to create a compression fit for the mechanism (101). One side of the retention disks has countersunk through holes (119) in circular pattern while the other has blind tapped holes (120) in matching circular pattern. The retention disks have a center hole diameter that is slightly larger than that of the variable-depth bearing adapter to allow the rotating center mechanism (101) to spin freely.
By integrating these technical innovations, the weight plate (102) with a rotating center mechanism (101) not only addresses existing challenges in weight training equipment but also introduces new possibilities for enhanced performance and safety. These advancements contribute significantly to the invention's market viability and potential for widespread adoption in both professional and home gym settings.

Manufacturing Process

The manufacturing process is crucial in ensuring that each weight plate meets the standards required for strength training equipment. The process begins with an assessment of the rubber or urethane material (122) volume needed to achieve the desired weight increment, including the weight of the rotating center mechanism (101), retention disks (118), and fasteners (121). Once the required material volume is calculated, a mold is made to the precise depth needed to accommodate the material, the rotating center mechanism (101), and retention disks (118). One or two bearings (106) are then chosen for the rotating center mechanism (101) based on the mold's depth and the load and spin properties of the bearing (106). The variable-depth bearing adapter (115) is then fabricated from metal to the cylinder depth required to accommodate the bearing(s) (106) and is assembled as shown in FIG. 12-18 to form the rotating center mechanism (101). The rotating center mechanism (101) is preferably centered in the mold with the hot rubber or urethane (122) poured or placed around it. As the material cures within the mold, a strong bond forms between the material and the exterior of the rotating center mechanism (101). This bonding is crucial as it secures the rotating center mechanism (101) in place, ensuring its stability and functionality throughout the weight plate's (102) lifespan.
Additionally, the manufacturing process optionally incorporates a step to increase the bond strength between the bearing (106) and the rubber/urethane (122), shown in FIG. 22-26 . Modifications to the bearing (106), such as welding or affixing a metallic attachment (123) to the bearing's outer ring (112) or machining grooves or threads (124) to increase its surface area, are implemented to enhance this bond. These modifications ensure a more durable and secure integration of the bearing (106) within the weight plate (102), contributing to the overall robustness and longevity of the product.
By detailing this process, the application underscores the invention's commitment to quality, durability, and functionality, positioning it as a significant advancement in strength training equipment. The nature of the manufacturing process, combined with the use of high-quality materials and engineering techniques, ensures that the weight plate (102) with a rotating center mechanism (101) not only meets but exceeds the expectations of athletes and fitness enthusiasts.

Adjustable Setup With Weight Plate Spacers

The adjustable nature of the weight plate (102) with a rotating center mechanism (101) is a cornerstone of this invention, offering unprecedented versatility in weight training. This adaptability is depicted in FIGS. 31-35 and 36-40 , illustrating examples of the wide range of configurations possible with the weight plates (102). Central to this flexibility is the inclusion of weight plate spacers (125), detailed in FIG. 41-43 , a novel feature enabling isolated rotation of each weight plate (102) by introducing an airgap between the weights (102). The weight plate spacers (125) create this airgap and independent rotation by being placed on either side of each weight plate (102), as illustrated in the views of FIG. 31-35 , only coming into lateral contact with the rotating center mechanism (101) of the weight plate (102). This placement ensures that the rotation of each plate (102) is independent, thereby addressing the challenges related to variable inertia during lifting. Such a design is crucial for exercises involving dynamic barbell movements (105), as it significantly enhances control and reduces the risk of injury from uncontrolled barbell shaft (104) rotation.
In contrast, for exercises like squats or bench presses where the barbell (105) travels in a linear path, free and independent rotation is typically not desired, and the spacers (125) can be easily removed. This allows the weight plates (102) with rotating center mechanism (101) to behave more like a traditional barbell (105) and weight plate (102) setup, providing a more conventional weightlifting experience. This dual functionality caters to the diverse needs of weightlifters, ranging from those focusing on Olympic-style lifts (126) to those engaged in powerlifting or general strength training.
Importantly, the weight plate spacers (125) also play a critical role in mitigating inertia-related challenges that arise when combining heavier (108) and lighter (109) weights on a barbell sleeve (103). In scenarios where there is friction in the barbell sleeve's (103) rotation, heavier weights (108) will tend to rotate slower than lighter weights (109) due to their greater inertia. This difference in rotation rates can lead to instability, particularly when these weights (102) are clamped tightly against each other with a barbell weight collar (128) to meet the desired exercise challenge weight. The spacers (125) effectively alleviate this issue by isolating each weight plate (102), thus liberating the rotational speed irrespective of individual plate weights.
The weight plate spacer (125) has an inner diameter of approximately 50.4 mm (129) to allow it to slide onto the barbell sleeve (103) in the same manner as an ordinary Olympic weight plate (102). Additionally, each weight plate (102) features a thin raised lip (130) around its outside diameter. This design aspect becomes particularly relevant when spacers (125) are not used as it allows multiple plates (102) to come into contact with each other and move as one unit in concert with the barbell sleeve (103), enabling a traditional barbell (105) and weight plate (102) setup, as shown in FIG. 36-40 .
In conclusion, the adjustable weight plate (102) set up with spacers (125) represents a significant advancement in strength training equipment. It offers unprecedented versatility, allowing users to tailor their weightlifting experience to their specific needs and preferences, enhancing safety, technique-focused training, and overall user experience. This invention sets a new standard in the realm of weight training, addressing longstanding issues and introducing a level of adaptability that was previously unattainable.

User Experience and Safety Enhancements

The invention of the weight plate (102) with a rotating center mechanism (101) marks a significant advancement in enhancing user experience and safety in strength training. This innovative design focuses on user experience and comfort, taking into account the diverse needs and safety concerns of weightlifters and athletes.
Central to this invention is its ability to significantly reduce joint stress and the risk of injury, a paramount concern in strength training. The rotating center mechanism (101), as depicted in FIG. 1-26 , allows each weight plate (102) to independently maintain its orientation relative to the barbell sleeve (103). This design, with the inclusion of weight plate spacers (125), is crucial in exercises involving rapid and forceful barbell rotation such as clean and jerks or snatches (126). By allowing each plate (102) to rotate independently, the rotating center mechanism (101) drastically reduces the rotational forces transmitted to the barbell shaft (104), and consequently, reduces the torque transferred to the trainee's body, thereby lowering the risk of joint injuries, especially in the shoulders, elbows, and wrists, which are commonly susceptible to injuries in weightlifting. This enhancement is vital for both novice and experienced weightlifters, as it ensures a safer training environment and allows athletes to focus more on their technique and less on mitigating injury risks.
In addition to its safety benefits, this invention greatly enhances the overall user experience. The independent rotation of each weight plate (102) ensures a smoother and more predictable lifting experience, allowing for more effective technique training. Athletes can engage in a broader range of exercises with increased confidence, knowing that the risk of injury is significantly mitigated. This feature is not only advantageous for experienced weightlifters but also for beginners, who can now train with a greater sense of security and ease.

Comparative Analysis With Prior Art

The development of the weight plate (102) with a rotating center mechanism (101) and weight plate spacers (125) marks a substantial advancement in the realm of strength training equipment, clearly differentiating it from existing technologies, such as weight plates (102) in the public domain and the patented ‘Short Dumbbell’. This analysis underscores the distinctiveness and technical innovation embodied in this invention.
In conventional Olympic weightlifting formats, the rotational aspect is often facilitated at the barbell sleeve (103). This design can lead to inconsistent rotation and potential injury (127) risks during dynamic lifting exercises, as all plates (102) loaded onto a sleeve (103) rotate uniformly, disregarding individual weight dynamics, shown in FIG. 47-48 . The current invention, however, innovatively integrates the rotating center mechanism (101) within the weight plate (102) itself. Demonstrated in FIG. 1-11 , this unique design ensures controlled and safer rotation, effectively addressing the limitations of sleeve-based rotation.
Additionally, regular weight plates, while functional for traditional weightlifting, fall short in exercises involving substantial barbell (105) rotation, such as in many CrossFit exercises. The proposed invention revolutionizes this aspect by implementing a mechanism (101) that enables each weight plate (102) to independently maintain its orientation relative to the barbell sleeve (103), a feature illustrated in FIG. 31-35 . This independence significantly reduces rotational forces exerted on the athlete, thereby enhancing both safety and performance.
In direct contrast to the patented ‘Short Dumbbell’, which is primarily designed with a rotating cap for label readability utilizing an asymmetrically weighted flywheel, the rotating center mechanism (101) in the weight plate (102) is specifically engineered for unrestricted and fluid rotation during exercise. This fundamental difference in design philosophy sets the weight plate (102) with rotating center mechanism (101) apart from the ‘Short Dumbbell’. The dumbbell, typically used in one-handed exercises, is not suited for Olympic weightlifting, which often involves two-handed barbell (105) movements. The ‘Short Dumbbell’ patent does not address the critical need for rotational fluidity in exercises that involve significant barbell (105) rotation and dynamic movement. The rotating center mechanism (101) in the weight plate (102), however, is designed to significantly mitigate rotational stress on athletes during such exercises, a functional benefit that is not provided by the design of the ‘Short Dumbbell’. This focus on unrestricted rotational movement in the weight plate (102) enhances safety and performance in Olympic weightlifting and other similar strength training exercises, where control and fluidity of movement are paramount.
An essential innovation of the invention lies in the weight plate spacers (125), depicted in FIG. 31-35, 41-43 . These spacers (125) provide a novel solution to challenges like variable inertia and instability during lifting. By isolating each weight plate (105), they enable independent rotation, offering a stable and controlled lifting experience, a benefit especially pronounced in dynamic barbell (105) movements and absent in previous designs.
Furthermore, the design of the rotating center mechanism (101), as elucidated in FIG. 1-26 , incorporates the variable-depth bearing adapter (115). This component, not seen in prior art, elevates the invention in terms of functionality and adaptability. Specifically, the variable-depth bearing adapter (115) facilitates the integration of the rotating center mechanism (101) into weight plates (102) of different thicknesses (108,109), an innovation well illustrated in FIGS. 5, 6 11 and 10, 11.
In summary, the comparative analysis with prior art, including the patented ‘Short Dumbbell’ and regular bumper plates (102) in the public domain, highlight the unique and inventive aspects of the weight plate (102) with a rotating center mechanism (101) and weight plate spacers (125). By recognizing the gaps in the prior art, this invention effectively addresses the specific challenges and limitations inherent in existing strength training equipment, delivering enhanced safety, efficiency, and adaptability. The detailed design and engineering underscore its potential, representing a significant progression in strength training equipment technology.

Environmental Considerations

The development of this innovative weight plate (102) with a rotating center mechanism (101) has been guided by a commitment to environmental sustainability. An essential aspect of this invention's environmental sustainability is its adaptability, which is visually represented in FIGS. 31-35 and 36-40 . By allowing for varied usage with a single barbell (105) and set of plates (102) to match any exercise methodology, the invention actively reduces the demand for multiple specialized pieces of equipment. This multifunctionality leads to a decrease in material use and a reduced carbon footprint in the production, distribution, and storage of strength training equipment. The ability to use one barbell (105) and set of weight plates (102) for a wide range of exercises not only makes this invention versatile and cost-effective but also eco-friendly, leading to a smaller carbon footprint that resonates with the growing global emphasis on environmental responsibility in product manufacturing.

Anticipated Industry Impact

The introduction of the weight plate (102) with a rotating center mechanism (101), as detailed in this patent, is anticipated to make a substantial impact on the strength training equipment industry. This impact is not just limited to the technical innovation it brings but extends to changing the dynamics of weightlifting practices and gym environments.
As illustrated in FIGS. 1-11 and 31-35 , the core innovation lies in the rotating center mechanism (101) that allows each weight plate (102) to maintain its orientation independently of the barbell sleeve (103). This feature fundamentally changes how athletes interact with barbells (105) during exercises, particularly in movements involving significant rotation such as Olympic lifts. The reduced rotational forces and enhanced safety are expected to resonate strongly with both amateur and veteran weightlifters, leading to widespread adoption in home gyms and training facilities.
Moreover, the versatility of this invention, showcased in FIGS. 31-35 and 36-40 , positions it as a highly adaptable solution in the market. The ability of the weight plate (102) with a rotating center mechanism (101) to seamlessly integrate with different training regimes—from Olympic weightlifting to powerlifting to general fitness—makes it a valuable addition to any gym's equipment roster.
The invention's adaptability, combined with the environmental considerations, positions it as a forward-thinking solution in an industry increasingly conscious of sustainability. By reducing the need for multiple pieces of equipment and promoting longevity and durability in its design, the invention not only appeals to eco-conscious consumers but also offers economic benefits to gym owners and home fitness enthusiasts. This approach aligns with current trends towards more sustainable and cost-effective fitness solutions.
Additionally, the anticipated impact of this invention extends to improving user experience and safety, as described in the ‘User Experience and Safety Enhancements’ section. By reducing the risk of injuries and enhancing the overall lifting experience, this invention is poised to set new standards in weightlifting safety.
The anticipated industry impact of this invention is multifaceted. It has the capacity to revolutionize weightlifting practices, offer environmental and economic benefits, and significantly improve user safety and experience. As such, it is poised to become a pivotal innovation in the strength training equipment market, driving forward advancements in both sustainable practices and technology.

Alternative Embodiments

FIGS. 49-50 illustrate the present general inventive concept according to an alternative embodiment.
As shown in FIGS. 49-50 , an alternative exemplary weight plate 500 is shown. The exemplary alternative weight plate 500 includes a circular outer plate portion 502. The outer plate portion 502 includes an outer periphery 504, an inner periphery 506 that is disposed radially inward of the outer periphery 504, and an outer plate opening (shown with element XXX extending therethrough) extending radially inward of the inner periphery 506.
The weight plate 500 further includes a rotating center mechanism 508. The rotating center mechanism 508 extends in the outer plate opening and includes an outer ring 510, an inner ring 512 disposed radially inward of the outer ring 510, and a rotating center mechanism opening 514 disposed radially inward of the inner ring 512. The outer ring 510 is in operative engagement with the inner periphery 506.
The exemplary rotating center mechanism opening 514 is configured to receive a sleeve of a barbell (the barbell shown in other FIGS.) The exemplary rotating center mechanism 508 is operative to maintain the rotational orientation of the weight plate 500 independent of any rotational movement of the barbell sleeve.
In the alternative exemplary weight plate 500, the rotating center mechanism 508 may include at least one bearing 516. Bearing 516 is operative to prevent transfer of rotational movement of the barbell sleeve to the weight plate 500.
The alternative exemplary weight plate 500 may further include a variable depth bearing adapter 518. The variable depth bearing adapter 518 enables the rotating center mechanism 508 to be integrated with weight plates having different thicknesses.
The alternative exemplary weight plate 500 may further include a circular retention disc 520. The circular retention disc 520 extends radially intermediate of the inner periphery 506 of the outer plate portion 502 and the outer ring 510 of the rotating center mechanism 508. The retention disc 520 is configured to secure the rotating center mechanism 508 to the outer plate portion 502.
In the alternative exemplary weight plate 500, the variable depth bearing adapter 518 includes a flanged cylinder 522 and a cylinder cap 524. The exemplary flanged cylinder 522 includes a cylindrical portion 526 and a flange portion 528. The cylindrical portion 526 includes an axially extending length 530 that extends within the rotating center mechanism opening 514 adjacent the inner ring 512. The flange portion 528 extends radially outward from the cylindrical portion 526 and abuts a first lateral face 532 of the bearing 516. The cylinder cap 524 abuts an opposed second lateral face 534 of the bearing 516 and releasably engages the cylindrical portion 526 extending through the rotating mechanism opening 514. The variable depth bearing adapter 518 is operative to maintain the bearing 516 axially positioned in surrounding relation of the axially extending length 530 intermediate of the flange portion 528 and the cylinder cap 524.
In the alternative exemplary weight plate 500, the axially extending length 530 of the cylinder portion 526 is configured to accommodate a further bearing or a bearing having a different axial width 536.
In the alternative exemplary weight plate 500, the flanged cylinder 522 includes a cylinder opening 538. The cylinder opening 538 has a diameter configured to receive a barbell sleeve.
In the alternative exemplary weight plate 500, the outer plate portion 502 may further include a raised lip 539 extending axially outward from at least one of a first lateral face 540 or an opposed second lateral face 542 of the outer plate portion 502. The raised lip 539 is configured to contact an immediately adjacent weight plate (not shown) and is operative to transfer any rotational movement of the weight plate 500 to the immediately adjacent weight plate.
The alternative exemplary weight plate 500 may further include a releasably engageable weight plate spacer 544. The weight plate spacer 544 is releasably engageable with a first lateral face 546 or an opposed second lateral face 548 of the rotating center mechanism 508. The weight plate spacer 544 is operative to prevent transfer of any rotational movement of the weight plate 500 to an immediately adjacent weight plate.
In the alternative exemplary weight plate 500, the exemplary rotating center mechanism 508 may be releasably engageable with the outer plate portion 502.
In alternative embodiments of weight plate 500, the weight plate 500 may include a circular outer plate portion 502 that includes an outer plate opening. The weight plate 500 may include a rotating center mechanism 508 that extends in the outer plate opening and is in fixed operative engagement with outer plate portion 502. The rotating center mechanism 508 includes a rotating center mechanism opening 514 configured to receive a sleeve of a barbell (not shown) therethrough. The rotating center mechanism 508 may further include at least one bearing 516. The rotating center mechanism 508 is operative to prevent any rotational movement of the barbell sleeve from transferring to the weight plate 500.
Such embodiments may further include a variable depth bearing adapter 518 that enables the rotating center mechanism 508 to be integrated with weight plates having different thicknesses.
In such embodiments, the variable depth bearing adapter 518 includes a flanged cylinder 522 and a cylinder cap 524. The flanged cylinder 522 includes a cylindrical portion 526 and a flange portion 528. The cylindrical portion 526 includes an axially extending length 530 that extends within the rotating center mechanism opening 514. The flange portion 528 extends radially outward from the cylindrical portion 526 and abuts a first lateral face 532 of the bearing 516. The cylinder cap 524 abuts an opposed second lateral face 534 of the bearing 516 and releasably engages the cylindrical portion 526 extending through the rotating mechanism opening 514. The variable depth bearing adapter 518 is operative to maintain the bearing 516 axially positioned in surrounding relation of the axially extending length 530 intermediate of the flange portion 528 and the cylinder cap 524.
In such embodiments, the axially extending length 530 of the cylinder portion 526 is configured to accommodate at least one of a further bearing 536 and a bearing having a different axial width.
In such embodiments, the flanged cylinder 522 includes a cylinder opening 538 that has a diameter configured to receive a barbell sleeve.
Such embodiments may further include a circular retention disc 520 that extends radially intermediate of the outer plate portion 502 and the rotating center mechanism 508 and that is configured to secure the rotating center mechanism 508 to the outer plate portion 502.
In such embodiments, the outer plate portion 502 may further include a raised lip 539 extending axially outward from at least one of a first lateral face 540 or an opposed second lateral face 542 of the outer plate portion 502. The raised lip 539 is configured to contact an immediately adjacent weight plate (not shown) and is operative to transfer any rotational movement of the weight plate 500 to the immediately adjacent weight plate.
Such embodiments may further include a releasably engageable weight plate spacer 544 that is releasably engageable with a first lateral face 546 or an opposed second lateral face 548 of the rotating center mechanism 508. The weight plate spacer 544 is operative to prevent transfer of any rotational movement of the weight plate 500 to an immediately adjacent weight plate.
In alternative embodiments of the weight plate 500, the weight plate 500 may include an outer plate portion 502 include an outer periphery 504, an inner periphery 506 disposed radially inward of the outer periphery 504, and an outer plate opening extending radially inward of the inner periphery 506. The weight plate 500 may further include a rotating center mechanism 508 configured to extend in the outer plate opening and includes an outer ring 510, an inner ring 512 disposed radially inward of the outer ring 510, and a rotating center mechanism opening 514 disposed radially inward of the inner ring 512. The outer ring 510 is releasably engageable with the inner periphery 506. The rotating center mechanism opening 514 is configured to receive a sleeve of a barbell. The rotating center mechanism 508 includes at least one bearing 516, and the rotating center mechanism 508 is operative to enable the rotational orientation of the weight plate 500 to be maintained independently of any rotational movement of the barbell sleeve.
In such embodiments, the weight plate 500 may further include a variable depth bearing adapter 518 that houses the bearing 516 and includes a flanged cylinder 522 and a cylinder cap 524. The flanged cylinder 522 comprises a cylindrical portion 526 and a flange portion 528. The cylindrical portion 526 includes an axially extending length 530 that extends within the rotating center mechanism opening 514 adjacent the inner ring 512. The flange portion 528 extends radially outward from the cylindrical portion 526, and the cylinder 524 cap releasably engages the cylindrical portion 526 extending through the rotating center mechanism opening 514.
As can be appreciated, the features and relationships of the various embodiments disclosed herein may be combined or otherwise changed to form other embodiments within the scope of the present general invention. Similarly, the method steps of the various processes and methods disclosed herein may be combined or otherwise changed from new processes or methods within the scope of the present general inventive concept.

Conclusion

This comprehensive description encapsulates the advancements brought forth by the introduction of the weight plate (102) with a revolutionary rotating center mechanism (101). This invention signifies a paradigm shift in the domain of strength training equipment, heralding advancements in terms of safety, functionality, and adaptability in weightlifting practices.
The heart of this invention, the rotating center mechanism (101), addresses a need in the weight training community for equipment that mitigates injury risk while simultaneously augmenting performance efficacy. This design, along with the novel weight plate spacers (125) facilitates each weight plate's (102) autonomous orientation relative to the barbell sleeve (103), a feature that is primarily advantageous in exercises involving significant barbell rotation such as Olympic weightlifting. This characteristic not only elevates the safety of weightlifting routines, as detailed in the ‘User Experience and Safety Enhancements’ section, but also aligns with the overarching objective of fostering injury-preventive and more effective training sessions.
Moreover, the adaptability of this invention, demonstrated in various weight plate configurations shown in FIGS. 31-35 and 36-40 , underscores its versatility. It can seamlessly integrate into diverse training routines, making it a suitable addition to a wide array of fitness environments, from professional facilities to home gyms setups. This versatility is not just a testament to the invention's design but also to its alignment with current trends in fitness and training methodologies.
Environmental considerations are also integral to this invention, as elucidated in the ‘Environmental Considerations’ section. The emphasis on advocating for a product that reduces the need for multiple equipment sets not only distinguishes this invention in terms of innovation but also demonstrates its ecological conscientiousness. This facet is increasingly relevant in a marketplace where both consumers and enterprises are gravitating towards more environmentally sustainable alternatives.
It is important to recognize that the present invention, as described in detail through specific embodiments, is not limited to these exact configurations and components. Variations and modifications to the design, structure, and choice of materials for the rotating center mechanism (101) and weight plate spacers (125) are conceivable and fall within the ambit of this invention. Such alterations may extend to the adaptation of the invention for diverse types of strength training apparatus, reflecting the flexibility and broad applicability of the underlying inventive concept. These potential modifications, while possibly altering certain aspects of the invention, do not stray from the fundamental spirit and intended scope of the invention as initially presented.
In summary, the weight plate (102) with a rotating center mechanism (101) is poised to create a transformative impact on the strength training equipment industry. It addresses key issues related to safety and effectiveness, offering a product that meets the current and future needs of the fitness community. As such, this invention is not only a significant step forward in weightlifting technology but also a reflection of the evolving landscape of fitness and health, where innovation and safety converge. This comprehensive description affirms the invention's potential to impact the strength training domain positively, delivering wide-ranging benefits for users and the industry as a whole.

Claims

What is claimed is:

1. A weight plate, comprising:

a circular outer plate portion, wherein the outer plate portion includes

an outer periphery,

an inner periphery disposed radially inward of the outer periphery, and

an outer plate opening extending radially inward of the inner periphery,

a rotating center mechanism, wherein the rotating center mechanism extends in the outer plate opening and includes

an outer ring,

an inner ring disposed radially inward of the outer ring, and

a rotating center mechanism opening disposed radially inward of the inner ring,

wherein the outer ring is in operative engagement with the inner periphery,

wherein the rotating center mechanism opening is configured to receive a sleeve of a barbell,

wherein the rotating center mechanism is operative to maintain the rotational orientation of the weight plate independent of any rotational movement of the barbell sleeve.

2. The weight plate according to claim 1, wherein the rotating center mechanism includes at least one bearing, wherein the bearing is operative to prevent transfer of rotational movement of the barbell sleeve to the weight plate.

3. The weight plate according to claim 2, further comprising a variable depth bearing adapter, wherein the variable depth bearing adapter enables the rotating center mechanism to be integrated with weight plates having different thicknesses.

4. The weight plate according to claim 3, further comprising a circular retention disc, wherein the circular retention disc extends radially intermediate of the inner periphery of the outer plate portion and the outer ring of the rotating center mechanism, and wherein the retention disc is configured to secure the rotating center mechanism to the outer plate portion.

5. The weight plate according to claim 4, wherein the variable depth bearing adapter includes a flanged cylinder and a cylinder cap,

wherein the flanged cylinder comprises a cylindrical portion and a flange portion,

wherein the cylindrical portion includes an axially extending length that extends within the rotating center mechanism opening adjacent the inner ring, and

wherein the flange portion extends radially outward from the cylindrical portion and abuts a first lateral face of the bearing,

wherein the cylinder cap abuts an opposed second lateral face of the bearing and releasably engages the cylindrical portion extending through the rotating mechanism opening,

wherein the variable depth bearing adapter is operative to maintain the bearing axially positioned in surrounding relation of the axially extending length intermediate of the flange portion and the cylinder cap.

6. The weight plate according to claim 5, wherein the axially extending length of the cylinder portion is configured to accommodate a further bearing or a bearing having a different axial width.

7. The weight plate according to claim 6, wherein the flanged cylinder includes a cylinder opening, wherein the cylinder opening has a diameter configured to receive a barbell sleeve.

8. The weight plate according to claim 7, wherein the outer plate portion further includes a raised lip extending axially outward from at least one of a first lateral face or an opposed second lateral face of the outer plate portion, wherein the raised lip is configured to contact an immediately adjacent weight plate and is operative to transfer any rotational movement of the weight plate to the immediately adjacent weight plate.

9. The weight plate according to claim 8, further including a releasably engageable weight plate spacer, wherein the weight plate spacer is releasably engageable with a first lateral face or an opposed second lateral face of the rotating center mechanism, and wherein the weight plate spacer is operative to prevent transfer of any rotational movement of the weight plate to an immediately adjacent weight plate.

10. The weight plate according to claim 9, wherein the rotating center mechanism is releasably engageable with the outer plate portion.

11. A weight plate, comprising:

a circular outer plate portion, wherein the outer plate portion includes an outer plate opening,

a rotating center mechanism, wherein the rotating center mechanism extends in the outer plate opening and is in fixed operative engagement with outer plate portion,

wherein the rotating center mechanism includes a rotating center mechanism opening configured to receive a sleeve of a barbell therethrough,

wherein the rotating center mechanism includes at least one bearing, and

wherein the rotating center mechanism is operative to prevent any rotational movement of the barbell sleeve from transferring to the weight plate.

12. The weight plate according to claim 11, further comprising a variable depth bearing adapter, wherein the variable depth bearing adapter enables the rotating center mechanism to be integrated with weight plates having different thicknesses.

13. The weight plate according to claim 11, wherein the variable depth bearing adapter includes a flanged cylinder and a cylinder cap,

wherein the cylindrical portion includes an axially extending length that extends within the rotating center mechanism opening, and

14. The weight plate according to claim 13, wherein the axially extending length of the cylinder portion is configured to accommodate at least one of a further bearing and a bearing having a different axial width.

15. The weight plate according to claim 14, wherein the flanged cylinder includes a cylinder opening, wherein the cylinder opening has a diameter configured to receive a barbell sleeve.

16. The weight plate according to claim 15, further comprising a circular retention disc, wherein the circular retention disc extends radially intermediate of the outer plate portion and the rotating center mechanism, and wherein the retention disc is configured to secure the rotating center mechanism to the outer plate portion.

17. The weight plate according to claim 16, wherein the outer plate portion further includes a raised lip extending axially outward from at least one of a first lateral face or an opposed second lateral face of the outer plate portion, wherein the raised lip is configured to contact an immediately adjacent weight plate and is operative to transfer any rotational movement of the weight plate to the immediately adjacent weight plate.

18. The weight plate according to claim 17, further including a releasably engageable weight plate spacer, wherein the weight plate spacer is releasably engageable with a first lateral face or an opposed second lateral face of the rotating center mechanism, and wherein the weight plate spacer is operative to prevent transfer of any rotational movement of the weight plate to an immediately adjacent weight plate.

19. A weight plate, comprising:

an outer plate portion, wherein the outer plate portion includes

an outer periphery,

an inner periphery disposed radially inward of the outer periphery, and

an outer plate opening extending radially inward of the inner periphery,

a rotating center mechanism, wherein the rotating center mechanism is configured to extend in the outer plate opening and includes

an outer ring,

an inner ring disposed radially inward of the outer ring, and

a rotating center mechanism opening disposed radially inward of the inner ring,

wherein the outer ring is releasably engageable with the inner periphery,

wherein the rotating center mechanism includes at least one bearing, and

wherein the rotating center mechanism is operative to enable the rotational orientation of the weight plate to be maintained independently of any rotational movement of the barbell sleeve.

20. The weight plate according to claim 19, further comprising a variable depth bearing adapter, wherein the variable depth bearing adapter houses the bearing and includes a flanged cylinder and a cylinder cap,

wherein the flange portion extends radially outward from the cylindrical portion,

wherein the cylinder cap releasably engages the cylindrical portion extending through the rotating center mechanism opening.