Patent Description:
Traditional bumper plates used in training are made of solid rubber or elastomeric material. Bumper plates are used instead of metal disc plates to absorb the shock and deceleration of the weightlifter dropping or bumping the weight against the floor. As anyone who has been near a lifting gym knows, however, they are not effective in reducing shock, sound or impact. A known drawback of the prior art weight training equipment, including bumper plate design, is that there is a tradeoff between the noise made when the weights are dropped on a floor and the amount of bounce the weights show after they hit the floor. Low durometer elastomers (e.g. <NUM>) used in such equipment are relatively quiet, but they have a high bounce which can lead to injury. High durometer elastomers (e.g. <NUM>) have a low bounce, but can make a very loud noise (over <NUM> dB) when dropped. For example, tests conducted with a <NUM> lb (<NUM>) barbell with standard Rogue bumper plates dropped from <NUM>' <NUM>" (<NUM>) on a concrete floor covered with a <NUM>/<NUM> in (<NUM>) rubber mat was measured at <NUM> decibels (at a distance of <NUM> feet (<NUM>) from the decibel meter and <NUM> feet (<NUM>) from a wall) - the same decibels as a jet engine <NUM> feet (<NUM>) away. In the same test, the decibel level was measured at <NUM> decibels through a concrete wall (approx. <NUM> in, or <NUM>), finished and insulated on one side (approx. <NUM> in, or <NUM>,<NUM>), between two businesses. This level of noise is extremely disruptive. Further, it is known that a feeling of pain for the average individual begins around <NUM> decibels, and long or repeated exposure to sounds at or above <NUM> decibels can cause hearing loss. The louder the sound, the shorter amount of time it takes for a hearing loss to happen. Thereby, <CIT> is directed to barbell assembly including a bar and a weight subassembly adjacent each end of the bar. Each weight subassembly includes a wheel with a predetermined pattern of through holes and an inflatable component around the periphery of the wheel.

Another drawback is that high durometer weights cause damage to the floor upon impact, especially in a training facility where tremendous force is exerted in small areas of the floor, causing cracks that necessitate frequent and costly repairs. Thus, there is a need for a weight design that has both low bounce and low noise when dropped, and is more gentle on the surface receiving the impact.

In one aspect, a modified bumper plate is provided, which is disk shaped and having a rim, a body, a hub and a collar with an opening in the center, comprising at least two shock absorber regions, wherein a first shock absorber region in the rim comprises at least one circumferential row of spaced holes and at least one elastomeric material between the holes that forms surrounding radial walls. The at least one elastomeric material has a durometer hardness different from the rest of the modified bumper plate and the opening in the center of the collar is configured to receive a handle for lifting the modified bumper plate. The holes and surrounding radial walls in the rim act as shock absorbers when the modified bumper plate is dropped on a ground surface thus reducing the noise emitted without unduly increasing bounce. Furthermore, said first shock absorber region is on a periphery of the modified bumper plate making contact with the ground surface when the modified bumper plate is dropped on a ground surface and the second of said at least two shock absorber regions forms part of the body of the modified bumper plate.

In one aspect, the modified bumper plate comprises at least two elastomeric materials. In another aspect, at least one of the at least two shock absorber regions of the modified bumper plate has at least two rows of spaced holes for absorbing noise.

In yet another aspect, the shock absorber region in the rim with spaced holes and surrounding radial walls therein is positioned on the periphery of the modified bumper plate and is separated from an outer radial surface of the modified bumper plate by a skin. Thereby, the periphery makes contact with the ground surface when the modified bumper plate is dropped.

In one aspect, the shape of the spaced holes of the modified bumper plate is at least hexagonal, circular, square, triangular, trapezoidal or irregular. In one aspect, the spaced holes of the at least two shock absorber regions are pass-through and pass completely through the at least one elastomeric material the modified bumper plate.

In another aspect, the spaced holes of the at least two shock absorber regions pass only partially through the at least one elastomeric material of the modified bumper plate.

In one aspect, the spaced holes of the modified bumper plate are at least <NUM> to <NUM> wide in cross-section. In another aspect, the radius of the modified bumper plate is <NUM> to <NUM>. In another aspect, at least one of the at least two shock absorber regions comprises at least two rows of spaced holes for absorbing noise.

In another aspect, the opening in the center of the collar of the modified bumper plate is configured to receive a handle for lifting the modified bumper plate is about <NUM> in radius.

In one aspect, the at least one elastomeric material of the modified bumper plate is one or more of rubber, pressed crumb rubber, polyurethane or mixture thereof. In another aspect, the holes in one or both shock absorber regions are pass-through or go through only partially.

The foregoing summary, as well as the following detailed description, will be better understood when read in conjunction with the appended drawings. For the purpose of illustration, certain examples of the present description are shown in the drawings. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an implementation of systems, apparatuses, and methods consistent with the present description and, together with the description, serve to explain advantages and principles consistent with the invention. Reference Examples are labelled with an asterisk *.

The relative size and depiction of individual elements, features and structures may be exaggerated for clarity, illustration, and convenience.

In addition, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. For example, the use of a singular term, such as, "a" is not intended as limiting of the number of items. Also the use of relational terms, such as but not limited to, "top," "bottom," "left," "right," "upper," "lower," "down," "up," "side," are used in the description for clarity and are not intended to limit the scope of the invention or the appended claims. Further, it should be understood that any one of the features can be used separately or in combination with other features. Other systems, methods, features, and advantages of the invention will be or become apparent to one with skill in the art upon examination of the detailed description. It is intended that such additional systems, methods, features, and advantages be included within this description, be within the scope of the present invention, and be protected by the accompanying claims.

As used herein, the term "about" means plus or minus <NUM>% of a given value unless specifically indicated otherwise. As used herein, the term "shaped" means that an item has the overall appearance of a given shape even if there are minor variations from the pure form of said given shape. A pass through hole or a hole that passes completely through, is one that provides an opening in a solid body through which something, such as air, can pass. A pass through hole opens on opposite sides of the solid body or surface. A hole that passes partially through opens only on one side of the solid body or surface. A "groove" is a cut or depression on a material surface that is not surrounded by the material. A "layer" is a sheet, quantity or thickness of material forming a solid body or surface. In this disclosure, the term "quiet" will also be used to designate modified weights (i.e., bumper plates, dumbbells, kettlebells, etc) in accordance with different examples of the present invention that tend to exhibit low noise upon impact.

<FIG> is a front perspective view of a prior art bumper plate <NUM>. A bumper plate is a disk shaped weight that is mounted on a bar bell for weight training. The bumper plate includes an outer rim <NUM>, body <NUM>, hub <NUM> and collar <NUM>. The collar describes a central bar hole <NUM>. The interface between the rim and body includes an undercut <NUM>. Thus the thickness of the body may be somewhat less than the thickness of the rim. The interface between the body and the hub includes a step <NUM>. Thus the hub may have a larger thickness than the body. The larger thicknesses of the rim and hub relative to the body allow for raised indicia <NUM> to be molded into the body. The hub and rim protect said indicia when the bumper plate lies flat on the ground. The undercut also acts as a handle to make it easier to lift the bumper plate. The outer edge of the rim includes a bevel <NUM>. This makes it easier to pick up the bumper plate when it is lying flat on the ground.

A typical bumper plate may have a radius <NUM> in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>). Radius of <NUM> inches (<NUM>) is a standard size for competition. The bar hole radius <NUM> is about <NUM> inch (<NUM>). The hub radius <NUM> is about <NUM> inches (<NUM>). The rim height <NUM> is about <NUM> inches (<NUM>). The undercut is about <NUM> inches (<NUM>). The rim thickness <NUM> may be in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>) depending upon the weight of the bumper plate.

The bumper plate may be made of solid rubber, bonded crumb rubber, polyurethane or other elastomer. The durometer of the elastomer may be in the range of <NUM> to <NUM>. The collar may be made of metal. The hub may include a metal disk plate for extra weight.

<FIG> is a front perspective view of a modified bumper plate <NUM> in one example of the present invention. The bumper plate in <FIG> is disk shaped with a shock absorber region <NUM> in the rim <NUM>. The shock absorber region <NUM> includes a first circumferential row of first holes <NUM>. In one example, the holes <NUM> pass transversely through the rim and are evenly spaced. In a different example, the holes <NUM> do not pass completely through the rim but go through only partially. The holes <NUM> in this example are hexagonal, but any shape may be used. Some shapes which may be used for the hole include, but are not limited to, circle, square, triangle, trapezoidal among any other shapes including irregular shapes. In this example, the internal corners of the hexagons are rounded to reduce material cracking. A suitable internal radius of curvature of the internal corners <NUM> is in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>). The elastomeric material between the holes <NUM> forms radial walls <NUM>. The holes <NUM> and surrounding radial walls <NUM> act as shock absorbers when the bumper plate is dropped on the ground thus reducing the noise emitted without unduly increasing bounce. For bumper plates with a radius of about <NUM> inches (<NUM>) or greater, a suitable first hole width <NUM> is in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>). A suitable hole spacing <NUM> is in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>). A suitable wall width <NUM> is in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>). A suitable wall height <NUM> is in the range of <NUM> inches to <NUM> inch (<NUM> to <NUM>). A suitable spacing for other shapes can vary and be experimentally determined as discussed below.

In accordance with the example illustrated in <FIG>, a second circumferential row of second holes <NUM> may be provided adjacent to the row of first holes. As illustrated, the second holes <NUM> pass transversely through the disk, although in a different example may penetrate only partially. The second holes <NUM> form a plurality of circumferential walls <NUM> with the first holes <NUM>. The second row of holes <NUM> and respective walls provide additional shock absorbing capability.

Additional rows of holes may be provided, as desired. The holes <NUM>, <NUM> do not have to be the same shape or size within a given row. A suitable overall height of the shock absorber <NUM> region taken up by the rows of holes <NUM>, <NUM> may be in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>) for standard size equipment or vary in range for alternative designs.

Sufficient clearance <NUM> should be provided between the first holes <NUM> and the outer radial surface of the disk <NUM> to form a skin <NUM>. A suitable skin thickness is typically in the range of <NUM> inches to <NUM> inches (<NUM> to <NUM>). Larger thicknesses can be used for stronger skins depending on the selected material. The outer radial surface may also include radial projections (not shown) that can act as additional shock absorbers. For example, the shock absorber region <NUM> may be positioned on the outermost <NUM> inches to <NUM> inches (<NUM> to <NUM>).

The quiet bumper plate includes a rim <NUM>, body <NUM>, hub <NUM> and collar <NUM>. An undercut <NUM> may be provided at the interface of the rim and body. A step <NUM> may be provided at the interface of the body and hub. The dimensions of the rim, body, hub, collar, undercut and step may be similar to the dimensions of the corresponding features of the prior art bumper plate of <FIG>. The undercut and step recess the body relative to the rim and hub so that raised indicia <NUM> may be provided in the body. A bevel (not shown) may also be provided on the outer corner of the rim. As noted, the outer dimensions of the plate preferably are similar to those of standard equipment but can vary in different settings.

In order to keep the same plate radius and weight as the prior art and/or standard for competition, the thickness <NUM> of the plate a may be increased to account for the loss of material from the holes <NUM>, <NUM>. Higher density materials may be also be added in different examples. An example is the use of metal plates provided at the hub or internal to the bumper plate to increase overall density without unduly increasing thickness.

The quiet bumper plate may be made of an elastomer, such as rubber, pressed crumb rubber, poly urethane or mixtures thereof. Durometers may be in the range of <NUM> to <NUM>. Lower durometer elastomers may be used in bumper plates designated for home use. This will help keep the noise to levels acceptable in homes. A different durometer is used in the shock absorber region relative to the rest of the quiet bumper plate.

<FIG> is a front perspective view of an alternative quiet bumper plate <NUM>. This is similar to the quiet bumper plate of <FIG> except the shock absorber region <NUM> includes first holes <NUM> with an elongated inverted trapezoidal shape. The first holes <NUM> are evenly spaced circumferentially. Radial walls <NUM> are formed between the holes <NUM>. The radial walls <NUM> have a relatively wide base and narrow top.

<FIG> is a side perspective view of a quiet dumbbell <NUM>. The dumbbell includes a conventional hexagonal weight dumbbell <NUM> with a shock absorber <NUM> provided around each weight. The dumbbell <NUM> may be made of metal and the shock absorber <NUM> may be made of an elastomer. The holes in the shock absorber are similar to the holes in the quiet bumper plate of <FIG>, or may be adjusted to comport with the overall dimensions of the dumbbell.

<FIG> is a side perspective view of an alternative quiet dumbbell <NUM>. The dumbbell includes a conventional hexagonal weight dumbbell <NUM> with a shock absorber <NUM> provided around each weight. The dumbbell <NUM> may be made of metal and the shock absorber <NUM> is made of an elastomer. The holes in the shock absorber are similar to the holes in the quiet bumper plate of <FIG>, or may be adjusted to comport with the dimensions of the dumbbell. The shock absorbers for either quiet dumbbell (<FIG>) may have one or more flat outer surfaces for storage and stacking (not shown). In a specific example, the shock absorbing elastomeric layer can be configured so that the weight can retain the shape of a conventional hexagonal weight dumbbell.

<FIG> is a side perspective view of a modified kettlebell <NUM>. The kettlebell <NUM> includes a conventional kettlebell <NUM> with several shock absorber crescents <NUM> provided around the weight. The kettlebell <NUM> may be made of metal and the shock absorber crescents may be made of an elastomer. The holes in the shock absorber crescents are similar to the holes in the quiet bumper plate of <FIG> or modified as necessary to correspond to the dimensions of the kettlebell. The crescents may be attached to the kettlebell by any known means, such as welding, gluing, pre-molding or other means. Six to eight crescents are provided radially and join at the bottom of the kettlebell. Sufficient number of crescents are applied so that the metal kettlebell within the crescents does not hit the ground when dropped.

<FIG> is a front perspective view of an alternative modified kettlebell <NUM>. The kettlebell includes a conventional kettlebell <NUM> with several shock absorber crescents <NUM> provided around the weight. The kettlebell <NUM> may be made of metal and the shock absorber crescents <NUM> may be made of an elastomer. The holes in the shock absorber crescents are similar to the holes in the quiet bumper plate of <FIG> or adjusted to the dimensions of the device. The crescents may be attached to the kettlebell by any known means, such as welding, gluing, or pre-molding. In this example, six to eight crescents are provided radially and join at the bottom of the kettlebell though more or less crescents may be used. As in other examples discussed herein, the holes may extend through only partially through the shock absorber crescents. Alternative designs for a quiet kettlebell that does not use absorber crescents may include a heavy inner portion and an elastomeric outer portion provided with shock absorbing holes of different dimensions and arrangements. In such examples, the holes can be formed extending radially toward the center of the kettlebell or at an angle. In alternative examples to those illustrated in <FIG> and <FIG>, the ends of crescents <NUM> and <NUM> facing the top of the kettlebell may gradually taper to avoid sharp edges (not shown). In yet another examples, instead of crescents, the shock absorbing portion of the kettlebell can be configured as a layer of elastomeric material with holes therein that envelops the metal core of the kettlebell.

<FIG> is a side perspective view of a crescent shock absorber <NUM>. The crescent has a thickness <NUM> of about <NUM> inch (<NUM>). It has a height <NUM> of about <NUM> inch. It has an arcuate shape with a crescent angle <NUM> of about <NUM>°. The radius of curvature to the inside surface <NUM> is about <NUM> inches (<NUM>). Thus, the crescent would conform to the outer curvature of the prior art bumper plate of <FIG>. A single row of evenly spaced hexagonal first holes <NUM> is provided. The hole spacing <NUM>, in one example, may be about <NUM> inch (<NUM>). The hole width <NUM> is about <NUM> inches (<NUM>). The radial walls between the holes each have a width <NUM> of about <NUM> inches (<NUM>). The skin thickness <NUM> is about <NUM> inches (<NUM>). A first half of a reclosable <NUM>™ DualLock™ fastener <NUM> is provided on the inside surface of the crescent in a specific implementation. The first half was mated to the corresponding second half of the DualLock fastener that was bonded to the outer radial surface of a conventional bumper plate similar to the one shown in <FIG>. The crescent was formed by molding a thermoplastic elastomeric compound, Stantoprene™ <NUM>-<NUM> (item <NUM>). The rated durometer of the Stantoprene was Shore A <NUM>.

In an example, a test was conducted with a conventional barbell weighing <NUM> lb. The barbell had a bumper plate on each end of the style shown in <FIG>. The barbell was dropped from a height of <NUM>'<NUM> inches (<NUM>) onto a rubber stall mat covering a poured concrete floor. The noise of the impact was measured with a decibel meter. <NUM> dB was recorded when the barbell was dropped without any crescent shock absorbers on the bumper plates.

Another test was conducted with four crescent shock absorbers attached to the outer radial surfaces of the bumper plates on the barbell using the DualLock fasteners. The crescents wrapped around the outer surface of each bumper plate. The drop test was repeated. The noise recorded was only <NUM> dB with minor increase in bounce. It will be appreciated that the testing procedure described above can be used to help design modified weight training equipment with desired characteristics. For example, running the described tests on different hole designs can determine the hole configuration that is optimal for a desired noise level.

<FIG> is a diagram illustrating a front view of yet another example of a quiet bumper plate and a perspective view of a barbell with the quiet bumper plate.

Referring to <FIG>, another example of a quiet bumper plate <NUM> is illustrated that is similar to the quiet bumper plate of <FIG> except there are at least two shock absorber regions <NUM>, <NUM>. The first region <NUM> includes a first circumferential row of holes <NUM> and possibly a second circumferential row of holes <NUM>, and the second region <NUM> includes a third circumferential row of holes <NUM> and possibly a fourth circumferential row of holes <NUM>.

In a preferred embodiment, the dimensions of the first circumferential row of holes <NUM> and the third circumferential row of holes <NUM> are the same, and may have the same dimensions as described in reference to the first holes <NUM> of the quiet bumper plate <NUM> of <FIG>. The dimensions of the optional second circumferential row of holes <NUM> and the fourth circumferential row of holes <NUM> are the same, and may have the same dimensions as described in reference to the second holes <NUM> of the quiet bumper plate <NUM> of <FIG>. Other dimensions including the internal radius of curvature of the internal corners of the holes <NUM>, <NUM>, <NUM>, <NUM>, hole spacing, wall width, wall height, overall height of each shock absorber region <NUM>, <NUM> taken up by two rows of holes, and the skin thickness is the same as the dimensions provided in the example of <FIG>. In a preferred example, the distance between the outer rim of the bumper plate <NUM> and the outermost edge of the second shock absorber region <NUM> is <NUM> inches to <NUM> inches (<NUM> to <NUM>), where the outermost edge of the second shock absorber region <NUM> is defined by a circle contacting the point of each holes <NUM> which is closest to the outer rim of the bumper plate <NUM>.

In this example, by moving the holes toward the center of the plate, vibration and force that is transmitted from the ground when the plate is dropped can be better controlled. By moving the holes toward the center, this allows the two solid sections of the plate to move somewhat independently from each other when a large force is applied such as when a barbell is dropped. The resulting reduction of force would reduce the stress on the flooring below, thus reducing overall noise as well as damage to flooring. The second shock absorber region <NUM> and corresponding holes <NUM>, <NUM> also reduce the forces put on the collar and exerted from the collar, thus reducing the likelihood of a failure point. As before, holes can go through for ease of manufacture or go partially through to provide higher structural integrity. In the case of partial pass-through holes, adjacent holes in a row may alternate in a pattern where every other hole faces (i.e. are open in) one direction, and the alternate adjacent holes face (i.e. are open in) the other direction. This hole arrangement may be applied to all embodiments described in this application (i.e., <FIG>), and is intended to improve the structural integrity of the shock absorbing portions of the respective weights.

<FIG> is a diagram illustrating a front view of an additional example of a quiet bumper plate and a perspective view of a barbell with the quiet bumper plate.

Referring to <FIG>, another example of a quiet bumper plate <NUM> is illustrated that is similar to the quiet bumper plate of <FIG> except there is only the inner shock absorber region <NUM>. This region <NUM> includes a first circumferential row of holes <NUM> and an optional second circumferential row of holes <NUM>.

In a preferred examples, the dimensions of the first circumferential row of holes <NUM> may be the same as described in reference to the first holes <NUM> of the quiet bumper plate <NUM> of <FIG>. The dimensions of the second circumferential row of holes <NUM> may be the same as described in reference to the second holes <NUM> of the quiet bumper plate <NUM> of <FIG>. Other dimensions including the internal radius of curvature of the internal corners of the holes <NUM>, <NUM> hole spacing, wall width, wall height, overall height of the shock absorber region <NUM> taken up by the two rows of holes, and the skin thickness may be the same as the dimensions provided in the example of <FIG>, or vary as desired. In a preferred example, the distance between the outer rim of the bumper plate <NUM> and the outermost edge of the shock absorber region <NUM> may be <NUM> inches to <NUM> inches (<NUM> to <NUM>), where the outermost edge of the shock absorber region <NUM> is defined by a circle contacting the point of each holes <NUM> which is closest to the outer rim of the bumper plate <NUM>.

Further, it should be appreciated that the sizes and dimensions of holes may vary according to optimal dimensions determined through testing. That is, testing procedure can be used to help design modified bumper plates, or more generally weights, with desired characteristics. For example, running the described tests on different hole designs can determine the hole configuration that is optimal for a desired noise level and/or weight equipment.

In this example, by moving the row of shock absorbing holes <NUM>, <NUM> to the center of the plate, this may increase durability over variations where the shock absorbency is on the outer ring.

<FIG> is a diagram illustrating a front view of another example of a quiet bumper plate and a perspective view of a barbell with the quiet bumper plate.

Referring to <FIG>, another example of a quiet bumper plate <NUM> is illustrated. This example is similar to the quiet bumper plate of <FIG> except the inner shock absorber region <NUM> is closer to the collar of the bumper plate <NUM>. This region <NUM> includes a first circumferential row of holes <NUM> and an optional second circumferential row of holes <NUM>.

In a preferred examples, the dimensions of the first circumferential row of holes <NUM> may be the same as described in reference to the first holes <NUM> of the quiet bumper plate <NUM> of <FIG>, or may vary as desired or dictated by design. The dimensions of the second circumferential row of holes <NUM> may be the same as described in reference to the second holes <NUM> of the quiet bumper plate <NUM> of <FIG>. Other dimensions including the internal radius of curvature of the internal corners of the holes <NUM>, <NUM> hole spacing, wall width, wall height, overall height of the shock absorber region <NUM> taken up by the two rows of holes, and the skin thickness may be the same as the dimensions provided in the example of <FIG>, or may vary as desired or dictated by design. In a preferred example, the distance between the outer rim of the bumper plate <NUM> and the outermost edge of the shock absorber region <NUM> may be <NUM> inches to <NUM> inches (<NUM> to <NUM>), where the outermost edge of the shock absorber region <NUM> is defined by a circle contacting the point of each holes <NUM> which is closest to the outer rim of the bumper plate <NUM>.

In this example, by moving the row of shock absorbing holes <NUM>, <NUM> to the collar of the plate, this may increase durability over variations where the shock absorbency is on the outer ring. By moving the row of shock absorbing holes <NUM>, <NUM> to where the bar passes through the plate this could also reduce the forces that cause damage to the collar. It will be appreciated that the bar hole alone or in combination with the bar can be used as a handle to hold and lift the plate off the ground.

<FIG> is a diagram illustrating a front view of a further example of a quiet bumper plate <NUM> and a perspective view of a barbell with the quiet bumper plate. The bumper plate <NUM> of <FIG> is a variation of the bumper plate <NUM> illustrated in <FIG> in which a highdensity foam is added to the open spaces of the shock absorbing holes on the outer ring. In this example, by adding the foam to the open spaces of the shock absorbing holes, all the benefits of the bumper plate <NUM> of <FIG> are retained with the added benefits of reduced noise reduction and compression and increased durability.

While this example illustrates foam being added to all holes, a number of different variations may be provided. For example, foam may be added to only the first row of circumferential holes and not the second row of circumferential holes. In contrast, the foam may be added to only the second row of circumferential holes and not the first row of circumferential holes. Further, foam may be added to only half of the holes in any type of arrangement such as every other hole or only on one side of the bumper plate <NUM>. This example may be applied to all embodiments illustrated; that is, foam may be used to fill holes in all embodiments described throughout the application. Other materials may also be used to fill the holes such as elastomeric, gel, or other materials.

Also, flat sheets of elastomers with shock absorber regions may be used as protective mats. The shock absorber regions may be similar to the ones described above. Thus when a weight is dropped on the mat, the mat will suppress noise without unduly increasing bounce. The shock absorber mats may be made by extrusion.

<FIG> is a diagram illustrating a quiet bumper plate formed by a two-part molding process of one or more materials.

Referring to <FIG>, a method of manufacturing a quiet bumper plate <NUM> and a quiet bumper plate <NUM> formed using such a method are described. According to this example, the center section <NUM> of the plate <NUM> is molded to the outside ring <NUM> in a two-part molding process. This manufacturing process allows the center section <NUM> of the plate <NUM> to be molded in a higher density rubber allowing for reduced bounce and greater durability.

For example, the center section <NUM> is formed of rubber having a density in the range of <NUM> durometers to <NUM> durometers, preferably in the range of <NUM> durometers to <NUM> durometers, and most preferably in the range of <NUM> durometers to <NUM> durometers. The outside ring <NUM> may be formed of rubber having a density in the range of <NUM> durometers to <NUM> durometers, preferably in the range of <NUM> durometers to <NUM> durometers, and most preferably in the range of <NUM> durometers to <NUM> durometers. Higher density or durometer bumper plates bounce less and are more durable than lower density plates. Accordingly, at least one advantage of a higher density outside ring <NUM> includes providing a more durable and less bouncy bumper plate while maintaining the shock absorption advantages of a lower durometer center section <NUM>.

In another example, the center section <NUM> may be formed of rubber having a higher density than the rubber forming the outside ring <NUM>. In other words, unlike the previous example, the lower density section may be formed on the outside while the higher density section is formed on the inside. In a further example, the center section <NUM> and the outside ring <NUM> may be formed of different density materials or different materials altogether including any one or more of a rubber, a polymer, a metal, other elastomers, or other materials.

In an example, a method of manufacturing the bumper plate <NUM> includes molding the center section <NUM> of the plate <NUM> with an inverted T-shaped groove <NUM> formed circumferentially around the entirety of the outer ring, as illustrated in the cross-sectional view of the bumper plate <NUM>. After the center section <NUM> has cured or is partially cured, the outer section <NUM> could be molded with a T-shaped projection <NUM> formed circumferentially around the entirety of the outer section <NUM> which corresponds to the T-shaped groove <NUM> of the center section <NUM>. In this example, the outer section <NUM> is also molded to include a first row of circumferential holes <NUM> and a second row of circumferential holes <NUM>. This results in the bumper plate <NUM> having the same arrangement of holes as provided in the bumper plate <NUM> of the example in <FIG> but the bumper plate <NUM> being formed on one or more materials having different characteristics. While this example describes a T-shaped groove <NUM> and a T-shaped projection <NUM>, it should be appreciated that a number of other shapes may be used for the groove and projection such as corresponding squares, triangles, U-shapes, among any other shapes. In addition, while this example describes the grooves and projections around the entire circumference of the bumper plate <NUM>, it should be appreciated that the grooves and projections may be formed around one or more partial sections around the bumper plate <NUM>.

Further, while this example results in the bumper plate <NUM> having the same arrangement of holes as provided in the bumper plate <NUM> of the example in <FIG>, it should be appreciated that any of the described and envisioned examples may also be formed according to this method. That is, the inner section may also be molded with holes to result in a bumper plate <NUM> as provided in the example in <FIG>, or the inner section only may be molded with holes to result in a bumper plate <NUM>, <NUM> as provided in the examples of <FIG> and <FIG>. In addition, in all of these examples, the resulting bumper plate <NUM> may include holes that are filled with foam as described in connection with the description provided for <FIG>.

Sound tests were conducted using an example prototype of the above described bumper plates as illustrated in <FIG>.

The test parameters used were as follows:.

The results for this test are described below in Table <NUM>. Referring to Table <NUM>, the Rogue Echo results are dB values without use of the prototype, the Stealth <NUM> Stip SWL Prototype results are dB values with use of the prototype. Delta refers to the difference in values with and without use of the prototype, other values including percent decrease, average percent decrease, average dB decrease, and percent of noise eliminated are based on the calculated delta values.

One of skill in the art will recognize that the described examples are not limited to any particular equipment size. Further one of skill in the art will recognize that the bumper plates, dumbbells, kettlebells, and shock absorbers described herein are not limited to any type of material. As a non-limiting example, the bumper plates are formed primarily from rubber. One skilled in the art will recognize that other diameters, types and thicknesses of preferred materials can be utilized when taking into consideration preferred shock absorption characteristics and different applications that can be determined and optimized, for example, via sound testing as described above.

An additional configuration is envisioned as part of all embodiments discussed above. The modification is based on the "sealing" of the outward facing holes, similar to a familiar sealing of a honeycomb. The sealing may be achieved with a membrane that covers the outward facing openings, thus protecting them from dirt without affecting the overall design and/or efficiency of the holes. Methods for sealing the outward facing holes to this end will be apparent to a person having ordinary skill in the art. This may include but is not limited to sealing using an additional elastomeric or non-elastomeric material, such as a transparent or opaque rubber, plastic or polymeric material but not limited thereto.

<FIG> is a diagram illustrating another embodiment of the present invention, which includes slip over design variations for use with a bumper plate or other weightlifting equipment.

Slip over variations of the quiet (or stealth) weightlifting in this design modification allow users to add the quiet technology to their existing plate(s). This variation uses the same sound and shock absorbing technology as the full plate versions discussed above. However, instead of molding an entire plate as discussed in various examples above, the slip over version only includes the crescent and a pliable rubber inner rim or donut that allows the shock absorbing section to be forcibly slid over an existing weight plate.

This design modification is illustrated in <FIG>, in which <FIG>shows a side view of the shock absorbing slip over section <NUM>; <FIG> is a cross-section of the shock absorbing slip over section, which illustrates the retaining fingers or side extensions <NUM>; and <FIG>is a side view of the shock absorbing section <NUM> mounted over an existing plate. In <FIG> the slip over donut design <NUM> has an outer rim comprised of two rings of hexagonal holes and sides that extend down the outermost portion of an existing weight plate. It will be appreciated that instead of through holes, the slip over design may use different partial hole configurations or hole shapes as discussed before. These holes act to absorb the shock of a barbell when dropped by a weightlifter. The side extensions <NUM> illustrated best in <FIG> B allow for the rings of sound-absorbing holes to be forcibly slipped over an existing plate. A similar elastomeric material may be used with varying durometers for the sides as is used in the sound absorbing section. In alternative embodiments these side extensions may taper leading to beaded section to increase friction and hold (similar to a bike tire that fits over an inner tube). The sides have some malleability (i.e., ability to deform under compressive stress) to be able to slip over the plate and elasticity allowing the material deformed under load to regain its original dimensions when unloaded. The two bumps <NUM> at the ends of the side extensions keep the slip over portion fixed over the plate. If, for example, a vulcanized rubber is used for the side extensions durability generally is not an issue.

<FIG>shows a fully assembled design in which a slip over sound absorbing section is mounted over an existing plate. It will be appreciated that different slip over design configurations are possible, where instead of a single piece donut shaped sound absorber one can use several sectors that are separately mounted and glued together. One such design modification can use two or more sector pieces (such as, for example, illustrated in <FIG>) that are mounted separately and affixed together, such as by gluing to keep in place. A multi sector donut shaped slip over design can also be done using slits in sides and a strap or leather to reach through the center hole of the bumper plate (where the bar goes) and connect to the opposite side.

With reference to <FIG>, another potential design modification includes a sound absorber, where the donut-shaped absorber is cut in the middle along a vertical, resulting in two pieces that can be affixed together in use.

With further reference to the slip over design, it will be appreciated that the sides would be elastic, and should be difficult to put on, and correspondingly difficult to disengage from the plate when in use. Conceptually, this design would be similar to a bike tire over an inner tube, fitted sheet over a mattress, or swim cap over one's head. With a lower durometer rubber used for the sides, this slip over design should be pliable enough to be difficult but fit snug.

Another possibility is to incorporate small slits in the rubber to relieve some of the tension. This change may require a strap to reach through center hole of the bumper plate (where the bar goes) and connect on the opposite side to hold the slip over piece in place.

In different examples, the size of the plate would dictate a different size slip over bumper, or the end user would only use these with, for example, <NUM> and <NUM> lb weights (<NUM> and <NUM>, respectively). The need here outweighs the financial burden as well as the downrange costs of floor repairs.

Other modifications that help mount the absorber onto existing equipment are possible, as will be appreciated by those of skill in the art.

<FIG> is a diagram illustrating front, side and perspective views of a barbell with two slip over variation quiet bumper plates.

This figure shows multiple front, side and perspective views of the Quiet (or Stealth) weightlifting slip over option in a specific example. Two weight plates on a barbell are illustrated without limitation of the type of equipment for which the slip over design is suitable. Something to note here is that the inner rim of the stealth weightlifting slip over donut extends between <NUM> - <NUM> inches over the outer rim of the existing weight plate. These sides in one example may have a ridged texture on the underside and a rubber piping at its outer most edge to increase friction and hold on the weight plate.

The design examples shown in <FIG> and <FIG> all show the slip over variation on an existing weight plate. This slip over variation may increase the overall diameter of the weight plate slightly, and therefore is not suitable for competition use. However, for the average user as well as the professional athlete in training, this may be a small price to pay for the resulting significant decrease in noise and damage. The slip over design may also increase the weight slightly. This can be remedied by decreasing the weight of the bar, or adjusting the other weights used during lifts. Naturally, more than two plates may be attached to a barbell. In this case, only the largest diameter plate may be outfitted with sound absorber in different embodiments.

<FIG> is a diagram illustrating a stealth ball with sound absorption in different views, including exploded and assembled configuration in one example.

In many weight rooms, CrossFit gyms, and strong man gyms one can find variations on the medicine ball. A medicine ball (exercise ball, a med ball, or a fitness ball) is a weighted ball roughly the diameter of the shoulders often used for rehabilitation and strength training. Other variations of similar type include soft cushion filled balls for throwing, sand balls for slams and lifting, and atlas stones for lifting. Presently, users are required to buy a ball for every weight intended to be thrown, slammed, or lifted. For example, atlas stones, a type of lifting stones, typically include several stones of increasing weight that are placed on top of podia of varying height. Atlas stones are casted using concrete molds by the gym owner and are often used in lifts to the weightlifters shoulder then dropped to the ground causing noise and great damage to the floor.

By combining the Quiet (Stealth) Weightlifting plate with two sound absorbing half spheres, as illustrated in <FIG>, it was possible to develop the first adjustable medicine ball and atlas stone that utilizes equipment already available in a gym. One can lift and slam without cluttering the gym, avoid dealing with sand and other fillers, or worry about causing damage to the floor. This design addition would also allow a more widespread use of this type of lifting in the group and personal training setting by using Stealth Weightlifting (SWL) bumper plates for loading.

As shown in <FIG>, in accordance with one example, bumper plates can easily be used to make an adjustable medicine ball that compliments existing gym equipment. <FIG> show different perspective views of a "stealth ball" in a particular example using the technology of this invention. As shown, the Stealth Ball is intended as an add on to the Stealth Weightlifting plate/s, and consists of two half balls with the largest outside diameter around <NUM> to match the diameter of the corresponding plates. These half spheres are made and internally supported by elastomeric material and are secured with a set of varying length threaded connector with a <NUM>" (<NUM>) diameter at its center. Longer connectors could be provided if the user would like to increase the weight.

As shown in <FIG>, the sides of the half spheres may have space for corporate logo's, trademark, trade dress, or other information. <FIG> is an exploded side view of the Stealth Ball in one example showing the principal components: two hemispheres, one or more bumper plates (two shown in this case), and a threaded connector. <FIG>shows an exploded perspective view of the Stealth Ball, illustrating the use of sound absorbing material for the corresponding stealth plates. <FIG>is a side view of an assembled Stealth Ball ready for use. Various design modifications, including size (larger or smaller diameter), shape (where the spherical shape can be replaced with other shapes), weight (multiple add-on plates) will be apparent to one of skill in the art.

<FIG> is a disassembled variation of a quiet stealth ball in one example. This drawing shows how the stealth ball would be assembled using two Stealth Weightlifting (SWL) plates. First the user can determine the desired weight and select the correct length connector to use with the SWL bumper plates. Next, the user can screw the length of connector into one of the half spheres and load on the desired weight. Lastly the user can screw on the second half sphere leaving no gap in-between the inside face of the sphere and the bumper plate.

<FIG> is a fully assembled variation of the quiet stealth ball in <FIG>.

Claim 1:
A modified bumper plate (<NUM>, <NUM>) which is disk shaped and having a rim (<NUM>), a body (<NUM>), a hub (<NUM>) and a collar (<NUM>) with an opening in the center, comprising
at least two shock absorber regions (<NUM>, <NUM>, <NUM>), wherein a first shock absorber region (<NUM>, <NUM>) in the rim (<NUM>) comprises at least one circumferential row of spaced holes (<NUM>, <NUM>, <NUM>) and at least one elastomeric material between the holes (<NUM>, <NUM>, <NUM>) that forms surrounding radial walls (<NUM>, <NUM>);
wherein the at least one elastomeric material having durometer hardness different from the rest of the modified bumper plate (<NUM>, <NUM>);
wherein the opening in the center of the collar (<NUM>) is configured to receive a handle for lifting the modified bumper plate (<NUM>, <NUM>); and
wherein the holes (<NUM>, <NUM>, <NUM>) and surrounding radial walls (<NUM>) in the rim (<NUM>) act as shock absorbers when the modified bumper plate (<NUM>, <NUM>) is dropped on a ground surface thus reducing noise emitted without unduly increasing bounce,
wherein
said first shock absorber region (<NUM>, <NUM>) is on a periphery of the modified bumper plate (<NUM>, <NUM>) making contact with the ground surface when the modified bumper plate (<NUM>, <NUM>) is dropped on a ground surface and the second of said at least two shock absorber regions (<NUM>, <NUM>, <NUM>) forms part of the body (<NUM>) of the modified bumper plate (<NUM>, <NUM>).