Concentrated magnetic field vibration dampener

Abstract

This document discloses a vibration dampening device. The dampening device can be configured to damp motion of an object. The dampening device can include including a first magnetic array comprising three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

Description

Attorney Docket No. 370532.00202 CONCENTRATED MAGENTIC FIELD VIBRATION DAMPENERPRIORITY CLAIM

[0001] This patent document claims priority to United States Provisional Patent Application Number 63 / 778,556, filed March 27, 2025, and the entirety of which is fully incorporated reference into this document in its entirety.FIELD

[0002] The present disclosure generally relates to a vibration dampener.BACKGROUND

[0003] Many different devices, tools, firearms, vehicles, etc. produce unwanted vibrations that can be, for example, transferred into a user of the particular device. As an example, when a firearm is fired, the resulting forces can cause the user to experience recoil and other movements of the firearm that can be detrimental to the shooter and make additional follow-up shots difficult. Archers are presented with similar issues, as unwanted vibrations can travel from the bow to the archer upon the shooting of an arrow. As another example, physical impacts in sports can negatively brain health of players. Concussions caused by forces experienced in the head of players are rampant among athletes of all ages, especially, for example, those playing American football. In another context, vibrations created in various machinery by engines or motors, such as those in oil drilling rigs, pumps, etc., vehicles (like automobiles, agricultural equipment, aviation vehicles, drones, submarines, etc.), manufacturing equipment (such as lathes, milling machines, grinders, etc.) can cause premature part wear and replacement.1183813046.1Attorney Docket No. 370532.00202

[0004] Conventional vibration dampeners utilize rubber or other flexible materials, springs, or a combination of both to dissipate energy in the form of frictional forces, heat, etc. Such rubber dampeners are limited in the amount of vibration they can absorb for a given weight of the dampener. Thus, they are inefficient, very large and heavy, or they absorb a relatively small amount of energy. Accordingly, a lighter and more compact vibration dampener with improved dampening abilities is desirable.SUMMARY

[0005] In one aspect, the disclosed technology relates to a dampening device configured to damp motion of an object (for example, vibration or shock). The dampening device can include a first magnetic array having three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array, and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion. In some embodiments, the electrically-conductive member is configured to be fixed to the object. In other embodiments, the magnetic array can be configured to fixed to the object.

[0006] In some embodiments, the electrically-conductive member is a tube and the magnetic array is disposed within the tube. In some embodiments, the dampening device can further include a second magnetic array disposed within the tube, wherein the second magnetic array comprises three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic2183813046.1Attorney Docket No. 370532.00202 array. Tn some embodiments, the dampening device can further include a first end cap and a second end cap, wherein the first end cap encloses a first end of the tube and the second end cap encloses a second end of the tube.

[0007] In some embodiments, the dampening device can further include a first reset magnet. The first reset magnet is can be configured to bias the magnetic array to a first end of the tube. In some embodiments, the first reset magnet repels the magnetic array. In some embodiments, the first reset magnet can attract the magnetic array. The first reset magnet can be disposed at a second end of the tube. In some embodiments, the first reset magnet is configured to attract the magnetic array and the first reset magnet is disposed at a second end of the tube.

[0008] In some embodiments, the dampening device can further include a second reset magnet. In some embodiments, the first reset magnet and the second reset magnet are configured to both repel the magnetic array. In some embodiments, the first reset magnet is configured to repel the magnetic array and the second reset magnet is configured to attract the magnetic array.

[0009] In some embodiments, the first magnetic array and the electrically conductive member are separated by a gap. In some embodiments, the gap is less than about 1 mm. In some embodiments, the gap is less than about 3 mm.

[0010] In another aspect, the disclosed technology relates to a dampening device configured to damp motion of an object, the dampening device including: a segmented ring magnetic array comprising a plurality of magnetized sections, the sections being aligned such that they form a magnetic field that is concentrated along either an outer portion or an inner portion of the segmented ring magnetic array, and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the3183813046.1Attorney Docket No. 370532.00202 electrically-conductive member that resists the relative motion. In some embodiments, the sections of the segmented ring magnetic array can be aligned such that they form a magnetic field that is concentrated along an inner portion of the segmented ring magnetic array; and the electrically-conductive member can be positioned within an aperture of the inner portion of the segmented ring magnetic array. In some embodiments, the sections of the segmented ring magnetic array can be aligned such that they form a magnetic field that is concentrated along an outer portion of the segmented ring magnetic array; and the segmented ring magnetic array can be disposed within the electrically-conductive member. In some embodiments, the dampening device can further include a reset magnet configured to bias the segmented ring magnetic array toward a first portion of the electrically conductive member.

[0011] In another aspect, the disclosed technology relates to a flat or planar dampening device configured to damp motion of an object. The dampening device can include: a first magnetic array comprising three or more magnets arranged as a Halbach array to create a concentrated magnetic field around a portion of the magnetic array, and an electrically-conductive member configured as a flat sheet and positioned within the concentrated magnetic field. The dampening device can further include a housing. The magnetic array and the electrically-conductive member can be disposed within the housing. The magnetic array can be configured to move with respect to the electrically-conductive member along two axes.

[0012] In some embodiments, the dampening device can further include a first reset magnet configured to repel or attract the magnetic array. In some embodiments, the dampening device can further include a second reset magnet configured to repel or attract the magnetic array. The first reset magnet and the second reset magnet can be configured to bias the magnetic array to a first portion of the electrically-conductive member. The first portion of the4183813046.1Attorney Docket No. 370532.00202 electrically-conductive member can be an area opposite the first reset magnet and the second reset magnet. In some embodiments, the dampening device can further include a third reset magnet and a fourth reset magnet. In some embodiments, the first reset magnet, the second reset magnet, the third reset magnet, and the fourth reset magnet can be configured to bias the magnetic array to a desired portion of the electrically-conductive member. The desired portion of the electrically-conductive member can be a center portion.BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which are incorporated herein and constitute part of this specification, are illustrative of particular embodiments of the present disclosure and do not limit the scope of the present disclosure. The drawings are not to scale and are intended for use in conjunction with the explanations in the following detailed description.

[0014] FIG. 1A is a perspective view of an example Halbach array.

[0015] FIG. IB is a side view of the example Halbach array of FIG. 1A with lines illustrating the magnetic field.

[0016] FIG. 1C is a perspective view of another example Halbach array

[0017] FIG. 2A is a perspective view of an example magnet.

[0018] FIG. 2B is a perspective view of another example magnet.

[0019] FIG. 2C is a perspective view of another example Halbach array showing magnet polarities.

[0020] FIG. 2D is a perspective view of the example Halbach array of FIG. 2C showing another representation for magnet polarities.

[0021] FIG. 2E is a perspective view of another example Halbach array showing magnet5183813046.1Attorney Docket No. 370532.00202 polarities.

[0022] FIG. 2F is a perspective view of the example Halbach array of FIG. 2E showing another representation for magnet polarities.

[0023] FIG. 2G is a perspective view image of an example Halbach array.

[0024] FIG. 2H is a side image of an example Halbach array.

[0025] FIG. 3A is a side cross-sectional view of an example vibration dampener.

[0026] FIG. 3B is an end view of an example vibration dampener with an end cap removed.

[0027] FIG. 3C is a partially exploded side view of an example vibration dampener including a clamp mount.

[0028] FIG. 3D is a partially exploded end view of an example vibration dampener including a clamp mount.

[0029] FIG. 4 is a side cross-sectional view of another example vibration dampener.

[0030] FIG. 5 is a side cross-sectional view of another example vibration dampener.

[0031] FIG. 6 is a side cross-sectional view of another example vibration dampener.

[0032] FIG. 7A is a front view of an example radial Halbach array.

[0033] FIG. 7B is a side cross-sectional view of another example vibration dampener.

[0034] FIG. 7C is a front cross-sectional view of the example vibration dampener of FIG.7B.

[0035] FIG. 7D is a side cross-sectional view of another example vibration dampener.

[0036] FIG. 8A is a perspective view of an example flat Halbach array.

[0037] FIG. 8B is a perspective view of an example flat vibration dampener.

[0038] FIG. 8C is a perspective view of an example flat vibration dampener with two return magnets.6183813046.1Attorney Docket No. 370532.00202

[0039] FIG. 9 is a side cross-sectional view of another example vibration dampener. DETAILED DESCRIPTION

[0040] The following discussion omits or only briefly describes conventional features of the disclosed technology that are apparent to those skilled in the art. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are intended to be non-limiting and merely set forth some of the many possible embodiments for the appended claims. Further, particular features described herein can be used in combination with other described features in each of the various possible combinations and permutations. A person of ordinary skill in the art would know how to use the instant invention, in combination with routine experiments, to achieve other outcomes not specifically disclosed in the examples or the embodiments.

[0041] Unless otherwise specifically defined herein, all terms are to be given their broadest possible interpretation including meanings implied from the specification as well as meanings understood by those skilled in the art and / or as defined in dictionaries, treatises, etc. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the disclosed technology. It must also be noted that, as used in the specification and the appended claims, the singular forms "a," "an" and "the" include plural referents unless otherwise specified, and that the terms "includes" and / or "including," when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. Additionally, methods, equipment, and materials similar or equivalent to those described herein can also be used in the practice or testing of the disclosed technology.7183813046.1Attorney Docket No. 370532.00202

[0042] Various examples of the disclosed technology are provided throughout this disclosure. The use of these examples is illustrative only, and in no way limits the scope and meaning of the invention or of any exemplified form. Likewise, the invention is not limited to any particular preferred embodiments described herein. Indeed, modifications and variations of the invention may be apparent to those skilled in the art upon reading this specification, and can be made without departing from its spirit and scope. The invention is therefore to be limited only by the terms of the claims, along with the full scope of equivalents to which the claims are entitled.

[0043] Certain relationships between features of the dampener are described herein using the term “substantially” or “substantially equal”. As used herein, the terms “substantially” and “substantially equal” indicate that the equal relationship is not a strict relationship and does not exclude functionally similar variations therefrom. Unless context or the description indicates otherwise, the use of the term “substantially” or “substantially equal” in connection with two or more described dimensions indicates that the equal relationship between the dimensions includes variations that, using mathematical and industrial principles accepted in the art (e.g., rounding, measurement or other systematic errors, manufacturing tolerances, etc.), would not vary the least significant digit of the dimensions. As used herein, the term “substantially parallel” indicates that the parallel relationship is not a strict relationship and does not exclude functionally similar variations therefrom. As used herein, the term “substantially orthogonal” indicates that the orthogonal relationship is not a strict relationship and does not exclude functionally similar variations therefrom.

[0044] The present disclosure relates to an improved vibration dampener. The vibration dampener dissipates energy in the form of electricity through the generation of eddy currents. Eddy currents are created during relative motion between a magnet and a conductor. In disclosed8183813046.1Attorney Docket No. 370532.00202 embodiments, kinetic energy from vibrations (or another impulse) causes the relative motion between a magnetic array and a conductor. The motion causes eddy currents in the conductor, which generate an opposing magnetic field to the field created by the magnet. This opposing magnetic field acts as a “brake,” which attempts to stop the relative motion between the conductor and magnet. The result is kinetic energy being dissipated as electrical energy by the conductor. The electrical energy is harmlessly dissipated by the conductor as the eddy currents are closed loop currents within the conductor. Another small amount of energy may be dispersed as heat created by friction within the system. The magnitude of the eddy currents (or the power dissipated through the eddy currents) is proportional to the size of the magnetic field, the size of the conductor, and inversely proportional to the resistivity of the conductor and the density of the conductor. The damping force is proportional to the eddy current magnitude and velocity.

[0045] The magnetic array can be structured as a “Halbach” array, which is an arrangement of magnets having a concentrated magnetic field in one area and a relatively weaker magnetic field in another area. As illustrated in FIGs. 1A and IB, a Halbach array 10 can be constructed of multiple permanent magnets 12A-E. Magnets 12A-E may have different magnetization direction to create a magnetic array having a concentrated magnet field, as shown in FIG. IB, where the magnetic field is concentrated at the top of the Halbach array and relatively weak at the bottom. The curving lines extending from Halbach array 10 indicate the relative strengths of the magnetic fields. While FIGs 1A-B illustrate a rectangular 180 degree Halbach array configuration, other shapes are possible. As one example, FIG. 1C illustrates a 90 degree or “spiral” Halbach array configuration 11 that produces three magnetic field concentrations, each angled 90 degrees from each other around the array. This spiral field is caused by the 90 degree offset of the transverse magnets 13B and 13D. This configuration can cause rotation of the array when the array is allowed9183813046.1Attorney Docket No. 370532.00202 to travel through a conductive tube. This rotation can cause additional eddy currents and increase damping, as further described below.

[0046] As another example, a Halbach array can be constructed out of cylindrical or disk magnets, resulting in a cylindrical or tubular Halbach array. As shown in FIGs 2A-B, disk magnets 20 and 22 can be magnetized in different orientations. The magnets can then be attached together to form an array of magnets having alternating radial and tangential magnetization directions. Such a configuration can generate a concentrated magnetic field along the outer circumference while minimizing flux leakage in the inner region, which can result in an optimized interaction with an adjacent conductor.

[0047] By creating an asymmetric magnetic field, and thus concentrating the magnetic field along a certain portion or portions of the magnetic array (for example, along one side as illustrated in FIG. IB), the Halbach array can create a greater damping effect than a conventional symmetric field magnet. The concentrated strength of the magnetic field can create more eddy currents in the conductor for a given size of magnetic array, making the dampener unexpectedly more efficient and effective for its size. In other words, for the same size dampener, the Halbach array dampener can provide a large increase in dampening effect over a dampener incorporating a symmetric magnet.

[0048] Disclosed arrays are not limited to arrangements having the concentrated magnetic field on the outside; in other arrangements, the array can be constructed such that the concentrated magnetic field is on the inside. FIGs. 2C-D illustrate a three magnet Halbach array constructed from magnets 20, 22. Both FIGs. 2C and 2D illustrate the same array, but use different shorthand representations for the magnetizations (arrows vs. North and South indicators). In this example three magnet Halbach array 24, the strong side of the field can be along the top edge of the figure,10183813046.1Attorney Docket No. 370532.00202 extending in the longitudinal (horizontal in the image) direction along the length of the Halbach array 24. FIGs. 2E-F illustrating a five magnet Halbach array 28 constructed disk magnets 20, 22. The various permanent magnets of this disclosure can be rare-earth magnets with a high resistance to de-magnetization. This can ensure stable polarity under prolonged operational loads.

[0049] As shown in the figures, for example, FIGs. 2A-F the magnets can have a central bore 26, 30 aligned along the longitudinal axis 32 of the array. This can permit, for example, a fastener 200 to extend through each of the magnets to hold the Halbach array 24 together, as illustrated in FIGs. 2G-H. As illustrated in FIGs. 2G-H fastener 200 can be a bolt / threaded rod that is secured with one or more nuts 210. While various figures illustrate Halbach arrays incorporating a fastener to hold the array together, other methods of attachment are contemplated and the disclosed embodiments are not limited to a fastener. For example, the magnets may be attached using an adhesive (e.g., between the contacting faces of magnets) or a laminating or encasing process.

[0050] While FIGs. 1A-2H illustrate Halbach arrays having 3 or 5 magnets, arrays with other numbers of magnets are possible. For example, Halbach arrays can be constructed of having an even number of magnets (4, 6, 8, or more) or an odd number of magnets (7, 9, 11, or more). The Halbach arrays can be constructed with symmetric pole spacing to create repeating field concentrations that are symmetric about a certain portion of the magnet (for example, as illustrated in FIG. IB where the field concentrations are symmetric about a vertical centerline of the array, but asymmetric about a horizontal centerline). In other embodiments, Halbach arrays can be constructed with asymmetric spacing and alignment of magnets to create an array having field concentrations that are entirely asymmetric.11183813046.1Attorney Docket No. 370532.00202

[0051] The permanent magnets described in this document to create disclosed magnetic arrays can be of any suitable type, such as Neodymium (NdFeB), Samarium Cobalt (SmCo), Ferrite / Ceramic, Alnico, Bonded NdFeB, injection molded magnetic composites, sintered magnets, high-temperature rated magnets, and coated magnets (Ni, epoxy, PTFE), and encapsulated magnet assemblies.

[0052] The vibration dampener can include a housing that holds one or more conductors and one or more magnets. For example, the vibration dampener housing can hold a first magnetic array, a second magnetic array, and a conductor. In other embodiments, the vibration dampener may not have a separate housing. For example, the conductor may form all or a portion of the housing and contain the one or more magnetic arrays. The first and second magnetic arrays are positioned relative to the conductor such that a force exerted on the housing causes relative movement between the one or more magnetic arrays and the conductor. The dampener is configured to dissipate energy from the force through the relative movement through eddy currents generated in the conductor by the movement. The magnitude of the current generated (and the dampening effect) is proportionate to the velocity of the moving magnetic array and the strength of the magnetic field of the array.

[0053] In other words, a dampening device can be configured to attenuate movement of an object. The dampening device can include an electrically-conductive member, and a magnetic array. One of the electrically-conductive member and the magnetic array can be fixed relative to the object (e g., so that when the object moves, either the electrically-conductive member or magnet moves with the object). The other of the electrically-conductive member and the magnetic array (i.e., the one not mounted such that it is fixed relative to the object) is mounted for movement in relation to the electrically conductive member or the magnetic array12183813046.1Attorney Docket No. 370532.00202 fixed to the object. Put differently either the electrically-conductive member or the magnetic array is fixed to the object, and whichever of the two components is not fixed is capable of moving relative to the fixed component. This permits relative motion between the electrically-conductive member and the magnetic array such that eddy currents are generated upon motion of the object. The electrically-conductive member is positioned within a magnetic field of the magnetic array so that an eddy current generated within the electrically-conductive member by the magnetic array resists relative movement between the electrically-conductive member and the magnetic array. One or more additional magnetic arrays can be added, as described in greater detail below. For example, the magnetic array referred to above can be a first magnetic array, and a second magnetic array may be added such that it repels the first magnet array.

[0054] In some embodiments, a dampening device can include a second electrically-conductive member and a second magnetic array. The second electrically-conductive member can be positioned within a magnetic field of the second magnetic array so that an eddy current generated within the second electrically-conductive member by the second magnetic array resists relative movement between the second electrically-conductive member and the second magnetic array. In some embodiments, the second magnetic array and second electrically conductive member can be oriented with respect to the object such that the first magnetic array and first electrically-conductive member resist relative movement along a different axis than the second magnetic array and second electrically-conductive member. For example, a dampening device could include a first magnetic array and electrically conductive member that damps motion primarily along a first axis. The dampening device could then also include second magnetic array and second electrically-conductive member that damp motion along a second axis that is13183813046.1Attorney Docket No. 370532.00202 substantially perpendicular to the first axis. The dampening device could then be mounted to, for example, damp motion in both a horizontal and a vertical direction.

[0055] In some embodiments, when the dampening device includes a second electrically-conductive member and a second magnetic array, the first electrically-conductive member and a first magnetic array can be configured differently from the second electrically-conductive member and a second magnetic array. For example, the first electrically-conductive member and a first magnetic array can be configured to damp a first target vibration frequency or magnitude and the second electrically-conductive member and a second magnetic array an be configured to damp a second target vibration frequency or magnitude. Accordingly, the dampening device can be configured to efficiently damp different vibrations or force imports through the use of two or more magnetic array and corresponding conductive members.

[0056] A number of different additional factors can influence the degree of dampening provided by the vibration dampener. Various parameters of the design can be tuned to provide optimal dampening for a given application. For example, the number of Halbach arrays in the dampener, the number magnets in each Halbach array, the relative strength of the magnets, the dimensions or size and shape of the magnets, the type of magnets, the type of conductor, the shape of the conductor, the dimensions or size of the conductor, the distance between the magnets (if multiple magnets), the distance between the magnet(s) and conductor (or relative sizes of the magnet(s) and conductor), and the orientations of the magnets and conductor all can influence the degree of dampening provided by the vibration dampener.

[0057] The disclosed vibration dampeners can be removably attached to another device as disclosed herein (e.g., a firearm, bow, vehicle, building, item of sporting equipment, tool, etc.). The disclosed vibration dampeners can include an attachment mechanism to attach the vibration14183813046.1Attorney Docket No. 370532.00202 dampener to another device. Attachment mechanisms include but are not limited to a rail clamp (such as a clamp configured to attach to a dovetail rail, Picatinny (MIL-STD-1913) rail, Weaver rail, Arca-Swiss rail), an MLOK attachment, Keymod attachment, quick-detach sling-style mount or other ball / detent attachment mechanism, a single piece or multi-piece clamp (such as a square or circular tube clamp for mounting on a firearm barrel or optic), a flange with corresponding fasteners, or combinations thereof.

[0058] Some embodiments may not include a separate attachment mechanism, but rather may be placed within another device. For example, a vibration dampener may be placed within a cavity in another device, such as a cavity within the fore end, grip, or buttstock of a gun. As further examples, a vibration dampener may be placed within a cavity within a helmet or its padding, a power tool, a handle of a manual tool, etc. The disclosed vibration dampeners can also be incorporated into firearm accessories or furniture, such as flashlights, sights, optics, fore grips, stocks, magazines, slings, holsters, bipods, tripods, shooting rests, or the like.

[0059] Therefore, as noted above, the disclosed vibration dampeners can be used in a variety of applications. One such application is on firearms to reduce felt recoil, muzzle rise, lateral muzzle movement, and recovery time between shots. Such reduction not only improves the shooter’s experience (i.e., by reducing felt recoil and muzzle rise), but also allows for more accurate follow-up shots with greater speed. More accurate and faster follow-up shots are possible because dampened recoil and vibration reduced the deviation of the firearm’s point of aim after the shot. As used herein, a “firearm” may refer to a rifle, shotgun, pistol, or other such weapon, including semi-automatic and automatic firearms. Disclosed vibration dampeners can be scaled to various types and calibers of firearms. Disclosed embodiments are not limited to use on a certain type of firearm. For example, disclosed vibration dampeners can be used on pistols, revolvers,15183813046.1Attorney Docket No. 370532.00202 rifles, shotguns, muzzleloaders, and others. Disclosed vibration dampeners are also not limited to being used on a particular action type, for example, vibration dampeners can be placed on break open, bolt action, lever action, pump action, semi-automatic, automatic, etc. As a specific example, a smaller vibration dampener may be used on relatively lower caliber semi-automatic handguns or revolvers, such as 9MM or .38 special. Relatively larger versions of the disclosed vibration dampener can be used on higher caliber rifles, such as a .308 or 7MM. Even larger versions could be used on larger caliber rifles, such as a .50 caliber, or even 20MM or larger cannons.

[0060] Other possible applications of the disclosed vibration dampeners include vehicles (such as cars, trucks, ATVs, motorcycles, airplanes, helicopters, trains, boats, rockets, amusement park rides, bicycles, scooters, dollies, forklifts, trailers (of all types including cargo trailers and livestock trailers, etc.), tractors, construction equipment, drones, and the like); medical devices (gurneys, hospital beds, wheelchairs, and the like); power tools (saws, drills, wrenches, drivers, grinders, sanders, jackhammers, chainsaws, blowers, weed trimmers, tillers, lawnmowers, and the like); non-powered handle tools (hammers, hatchets, axes, shovels, picks, and the like); sporting equipment (archery bows, baseball bats, tennis rackets, golf clubs, helmets, sticks, or the like); protective equipment (helmets, body armor, or the like) household or office appliances (washing machines, driers, dishwashers, vacuum cleaners, printers / copiers, scanners, or the like); filming equipment (cameras, gimbals, tripods, or the like); manufacturing machinery (mills, presses, lathes, molding machines, conveyors, robotic systems, and the like).

[0061] As an example, a disclosed vibration dampener can be placed on a wheelchair or hospital bed to provide a smoother ride to a hospital patient. As another example, a disclosed vibration dampener could be placed in the riser of an archery bow, or in archery bow accessories such as stabilizers or sights. As another example, to reduce felt vibration to the user after striking16183813046.1Attorney Docket No. 370532.00202 an object, a disclosed vibration dampener could be placed in the handle of a baseball bat, an axe, or a hammer. As yet another example, a vibration dampener could be placed in the seat or handlebars of a bicycle. Even further examples include placing a disclosed vibration dampener in a chainsaw or leaf blower to reduce transferred vibration to the user.

[0062] One specific implementation is in helmets for various applications, such as sports (such as football, hockey, baseball, lacrosse, equestrian, racing, winter sports, skating sports, cycling, or others), military, construction, aviation, or other applications where helmets are used to protect wearers from potentially dangerous impacts to the head. Disclosed vibration dampeners can be placed within helmets to reduce the forces experienced by the wearer during impact. In other words, the vibration dampeners will dampen the vibrations caused by an impact and reduce the potential for injury of the wearer.

[0063] Because of the various potential applications of the disclosed vibration dampeners, the vibration dampeners can vary greatly in size, for example from about 1 inch in length and width to several feet in length and width. As an example, disclosed dampeners (for example, but not limited to, a firearm dampener) can be from about 1 inch to about 6 inches length, or about 2 inches to about 5 inches in length, or about 3 inches to about 6 inches in length. Disclosed dampeners can also vary in diameter depending on the application, for example, from about 0.5 inches to about 3 inches in width (or diameter), about 0.75 inches to about 1.5 inches, or larger . The internal components of the vibration dampeners can also vary in size accordingly.

[0064] FIG. 3A is a side cross-sectional view of an example vibration dampener 300. FIG.3B is an end view of vibration dampener 300 with an end cap 306 and clamp mount 350 removed. This view illustrates how the magnetic field of the Halbach array 304A is stronger on one side of the array because the array is attracted to the conductor 302 at this side (i.e., lower side 312),17183813046.1Attorney Docket No. 370532.00202 placing the Halbach array 304A off center within conductor 302. This is also illustrated in FIG.3A. FIG. 3C is a partially exploded view of an example vibration dampener 300 including a clamp mount 350. FIG. 3D is a partially deconstructed end view of the example vibration dampener 300 including a clamp mount 350.

[0065] Vibration dampener 300 can include a conductor 302 and one or more Halbach arrays 304A,B. Halbach arrays 304A,B can be constructed out of three magnets, as illustrated by, for example, FIGs. 2C and 2D, out of disk magnets 22 and 20. In the illustrated example, Halbach arrays 304A,B are assembled using fasteners, e.g., a bolt 308 and nut 310. However, as described in this document, disclosed embodiments are not limited to attachment through fasteners. Other methods of attachment, such as adhesives or lamination, are possible. Conductor 302 can form cavity 303. In this illustration, conductor 302 is a cylindrical tube (e.g., with a circular cross section). Halbach arrays 304A,B are arranged within and freely movable within cavity 303. In use, conductor 302 can be directly or indirectly fixed to the object to be dampened and Halbach arrays can move within the conductor 302 to create the dampening effect. More specifically, Halbach array 304A can be disposed proximate to proximal end of the conductor 302 and Halbach array 304B can be disposed proximate to a distal end of the conductor 302. When arranged in such a manner (with their ends facing each other), Halbach arrays 304A,B repel each other, biasing the Halbach arrays 304A,B toward opposite ends of conductor 302. When a force (such as a vibration) is applied to vibration dampener 300, Halbach arrays 304A,B can move within conductor 302 (substantially parallel to the long axis of the conductor 302), generating eddy currents that convert the mechanical energy into electrical energy and damp the vibration. In some cases, the circular cross section permits rotation of the Halbach arrays 304A,B within the tube of conductor 302. In other words, the Halbach arrays 304A,B can spin around the longitudinal axis of the tube of18183813046.1Attorney Docket No. 370532.00202 conductor 302, thereby generating additional eddy currents and additional dampening effect.

[0066] End caps 306A,B can be placed at each end of conductor 302 to close conductor 302 and enclose Halbach arrays 304A,B. In some embodiments, end caps 306A,B can be portions of a larger housing that encases the conductor 302. End caps can take a variety of suitable forms, such as slip fit or press fit caps, male or female threaded caps, or the like. In other embodiments, on or more end caps may be attached with an adhesive, welding, or similar method. End caps can also be constructed of a variety of suitable materials, such as plastics / polymers, rubber, or various metals. Materials of the end cap or housing (described in greater detail below) may be selected depending on the ultimate environment in which the dampening device is intended to be used.

[0067] Conductor 302 (also generally referred to herein as an electrically-conductive member) can be a hollow tube shape. Accordingly, conductor 302 can also be referred to as a conductive tubular member. Vibration dampener 300 is shown with a circular cross-section, but other shapes are also possible (e.g., rectangle, square, oval, triangle, or others). For example, Conductor 302 can be a solid tube. In other embodiments, conductor 302 can be a tube with one or more apertures through the wall of the tube (e.g., slots, holes, or other openings).

[0068] Conductor 302 is a conductive material (for example, a metal such as copper) and preferably has a relatively high conductivity. Conductors can also be made of other conductive materials including, but not limited to, metals such as aluminum, silver, gold, iron, zinc, or others including alloys, etc. In further embodiments, the conductor 302 can be a composite of multiple materials. In some embodiments, conductor 302 can be a laminated structure, for example, with a plurality of conductive layers. The layers can be the same material (for example, a laminated tube of multiple radially stacked copper layers). In other embodiments, the layers can be of two or more different materials.19183813046.1Attorney Docket No. 370532.00202

[0069] In some embodiments, conductor 302 can be made of two or more materials along its length. For example, conductor 302 can be a tube including alternating annular rings of different materials. This can permit the conductor to have sections of relatively higher conductivity and relatively lower conductivity. This can change the speed of the Halbach array as it travels through the conductor 302 and thus change the dampening characteristics of the dampener. A similar effect can be achieved in other embodiments with a single material by varying the wall thickness of the conductor over the length of the conductor. For example, conductor 302 can have a first area having a first wall thickness and a second area having a second wall thickness. The first area and second area can be separated by a distance.

[0070] Disclosed vibration dampeners can include a housing. The housing can contain other components of the vibration dampener. The housing can be constructed from a variety of suitable materials and can take various shapes. For example, the housing can be a tube constructed of carbon fiber, titanium, aluminum, steel, plastic, or other materials. In some embodiments, smaller versions of vibration dampener may include a lighter weight housing such as carbon fiber, aluminum, or plastic. Some applications may require a certain type of housing material based on the size of the dampener and the strength or other properties of the material. For example, larger dampeners may require a relatively stronger housing. Some materials (e.g., steel) may provide an additional benefit of having greater magnetic shielding. The housing can further include thermal insulation layers to protect internal components from temperature extremes.

[0071] Attachment 350 is shown as a clamp in FIGs. 3C and 3D, but many other types of attachment are possible. Attachment 350 can vary both in the way it attaches to the body of vibration dampener 300 as well as in the external attachment to attach vibration dampener 300 to other devices. For example, attachment 350 can include a one piece or multi-piece clamp. While20183813046.1Attorney Docket No. 370532.00202 attachment 350 is depicted as using at least two fasteners 352 (e.g., a screw, bolt, pin, rivet, etc.), a single fastener can be used. In other embodiments, a cam latch with a lever arm (or other suitable mechanism) can be used in place of or in addition to fasteners. In some embodiments, the attachment 350 can be integrally formed into a housing that contains or encloses conductor 302. In yet further embodiments, attachment 350 can be glued, taped, or welded to a housing body or conductor 302. In even further embodiments, attachment 350 can include a flange that is connected to housing body or conductor 302 using one or more fasteners. Attachment 350 can include a clamp 355 to attach to another object. As illustrated, the clamp 355 is a standard picatinny-style clamp, but other clamp styles such ARCA / SWISS, round or square tubing clamps, or the like can be used. In other embodiments, attachment 350 may include another mechanism to attach to another object such as a flange with holes for fasteners. Further, as described herein, an attachment 350 is not a requirement, as vibration dampeners can be embedded in other objects or otherwise connected to other objects with a separate attachment point 350 (such as by way of adhesive, welding, etc ).

[0072] In some embodiments, a spacer may be included between the conductor and the one or more Halbach arrays. The spacer can be a dielectric material such as a dielectric plastic, porcelain, glass, or others. The spacer may reduce the coefficient of friction between the magnets and the conductor, which may also reduce wear on the conductor and magnets cause from repeated use over many cycles. The spacer can also ensure a specific gap between the Halbach array and the conductor. For example, the spacer can be a cylindrical sleeve that fits inside and contacts the interior surface of the conductor. Similarly, the magnetic array can be sized t fit in side and contact the interior surface of the spacer.21183813046.1Attorney Docket No. 370532.00202

[0073] With or without a separate spacer, the Halbach array and conductor can be separated by a gap. The gap may vary based on the relative strength of the magnetic array.Clause 35. The dampening device of any of the preceding clauses where the magnetic array is separated from the corresponding electrically-conductive member by a gap. In some embodiments, the gap is less than about 3mm or less than about 1 1mm.

[0074] FIGs. 4-6 illustrate cross-sectional side views of other example arrangements of vibration dampeners incorporating a Halbach array. Each of FIGs. 4-6 illustrate an example using a single Halbach array (404, 504, 604). Vibration dampener 400 can include a conductor 402 and a Halbach array 404. Halbach array 404 can be constructed out of three magnets, as illustrated by, for example, FIGs. 2C and 2D, out of disk magnets 22 and 20. In the illustrated example, Halbach array 404 is assembled using fasteners, e.g., a bolt and two nuts. However, as described in this document, disclosed embodiments are not limited to attachment through fasteners. Other methods of attachment, such as adhesives or lamination, are possible. Conductor 402 can form a cavity 403. In this illustration, conductor 402 is a cylindrical tube (i.e., with a circular cross section) enclosed by end caps 406A,B. Halbach array 404 is arranged within and freely movable within cavity 403. One end of conductor 402 can include a reset magnet 408. reset magnet 408 can be fixed to conductor 402 or end cap 406A, for example with adhesive. Reset magnet 408 can be positioned to repel Halbach array 404. Reset magnet 408 primarily serves to “reset” Halbach array 404. In other words, the repelling forces push the Halbach 404 back to its respective end of conductor 402 so that when further forces are experienced (and are to be dampened), the Halbach array 404 is able to again move along conductor 402 toward reset magnet 408 and produce eddy currents. Magnet 408 can also serve to slow the movement of Halbach array 404. The repelling forces of magnet 408 can absorb some of the kinetic energy of Halbach array 404 and cause it to22183813046.1Attorney Docket No. 370532.00202 slow. Tn some embodiments, for example, when magnet 408 is configured to repel Halbach array 404, magnet 408 does not necessarily need to be fixed to the conductor or endcap. Reset magnet 408 can be configured to provide approximately the minimum repelling force required to cause Halbach array to move along conductor 402 and rest at end cap 406B. In this way, the Halbach array can generate the maximum amount of eddy currents (and thus produce the highest amount dampening) before the reset magnet force stops the Halbach array and slowly forces it back to its resting position. While generally described as repelling Halbach array 404, reset magnet 408 can also be configured to attract Halbach array 404 to bias Halbach array 404 to one end of conductor 402.

[0075] Some embodiments may include only one Halbach array without a return magnet. In such embodiments, vibration dampener may include a different reset mechanism, such as a extension spring or compression spring. The spring can be configured to return the magnet to one end of cavity 403 (similar to the function of magnet 408), so that the Halbach array can travel a greater length along conductor 402 to achieve a greater dampening effect. The spring may also bias the magnet to one end to prevent unnecessary movement of the Halbach array when the vibration dampener is not needed to greatly reduce vibrations. For example, without a reset mechanism, a magnet within a vibration dampener 100 attached to a firearm would freely slide around when the firearm is moved, not just when it is fired. This could cause unwanted wear on the magnet, as well as on the conductor 402 and other components of the vibration dampener.

[0076] FIG. 5 is an illustration of an example vibration dampener 500. Vibration dampener 500 is similar to vibration dampener 400 of FIG. 4, except that it includes two reset magnets 508A, 508B. Reset magnets 508A,B can be configured and positioned to bias Halbach array 500 to a particular portion of conductor 502. Reset magnets 508A, 508B can be substantially the same23183813046.1Attorney Docket No. 370532.00202 strength, such that Halbach array 504 stays biased toward the approximate center of cavity 503 at rest. In other embodiments, the magnets may be different relative strengths. This may, for example, bias the Halbach array 504 to one side of cavity 503. In some embodiments, one or both of reset magnets 508A,B can be fixed to end caps 506A,B or conductor 502. In some embodiments, the reset magnets can be configured such that one magnet attracts Halbach array 504 and one magnet repels Halbach array 504. The attracting magnet can serve as a stabilizer or catch magnet. For example, the attracting reset magnet may be relatively weak and just strong enough to hold Halbach array 504 in place against gravity or other relatively low motion or low load conditions to prevent unwanted movement of Halbach array 504. However, the strength of the attracting magnet can be configure such that the when a desired load threshold is reached, the load overcomes the attractive holding power of the attractive reset magnet and Halbach array 504 is able to move.

[0077] FIG. 6 is an illustration of an example vibration dampener 600. Vibration dampener 600 is similar to vibration dampener 400, except it includes a five-magnet Halbach array 604 (instead of the three-magnet Halbach array 404 of FIG. 4). The five-magnet Halbach array 604 can be stronger than corresponding three-magnet Halbach array 404, and thus may be used in different situations requiring greater dampening capabilities. While three and five-magnet Halbach arrays are illustrated, disclosed embodiments are not limited to these numbers of magnets. Halbach arrays with a greater number of magnets are possible.

[0078] FIG. 7A is an illustration of an end view of an example radial Halbach array. A radial Halbach array can concentrate the magnetic field on the inside or outside of the array (as opposed to one side of the array. In the example of FIG. 7A, the magnetic field of Halbach array 700 is equally concentrated around the outside circumference of the array, while being minimized24183813046.1Attorney Docket No. 370532.00202 in the center aperture 703. Radial Halbach arrays are not limited to this configuration. For example, a Halbach array having the opposite effect could be created, where the magnetic field is concentrated in the center 703 of the array. In other cases, the magnetic field can be distributed in different manners on both the inside and the outside. Radial arrays can be constructed of multiple individual permanent magnets 702A-702G. The illustrations of the figures show arrays having 8 magnets, but arrays having a different number of magnets are possible. For example, a radial array may be constructed of a large number of magnets. As a more specific example, a radial Halbach array can be constructed of 40 magnets (e.g., five longitudinal stack of eight magnets around the circumference, as illustrated by stacked radial Halbach array 755 of FIG. 7D). Radial Halbach arrays can be constructed out of arc-segment magnets and connected with adhesive or by laminating or otherwise encasing the entire Halbach unit.

[0079] FIG. 7B is an illustration of a side cross-sectional view of a vibration dampener 710 including a radial Halbach 700. FIG. 7C is an end cross-sectional view of vibration dampener 710 taken along A-A in FIG. 7B. Halbach array 700 can be constructed out of a plurality of arc-segment magnets, as illustrated by, for example, 7A. Conductor 704 can form a cavity 705. In this illustration, conductor 704 is a cylindrical tube (e.g., with a circular cross section). Halbach array 700 is arranged within and freely movable within cavity 705. Each end of conductor 704 can include reset magnets 708A,B. Reset magnets 708A,B can be fixed to conductor 704 or end caps 706A,B, for example, with adhesive. Reset magnets 708A,B can be configured and positioned to bias Halbach array 700 to a particular portion of conductor 702. For example, reset magnets 708A,B can be positioned to repel Halbach array 700. In some embodiments, as described above, for example, with respect to FIG. 5, reset magnets can also be configured to attract Fixed magnets 508A, 508B can be substantially the same strength, such that Halbach array 504 stays biased25183813046.1Attorney Docket No. 370532.00202 toward the approximate center of cavity 503 at rest. As described above, in other embodiments, the fixed magnets can be of different strengths. In some embodiments, one or both magnets can be configured to attract the Halbach array. The configuration of the radial Halbach array 700 having its magnetic field concentrated on the outside of the array can cause eddy currents to be generated in conductor 704 when Halbach array 700 moves with conductor 704. Additionally, because the field is concentrated radially and equally about the circumference of the array, Halbach array 700 can stay substantially centered in conductor 704 (as illustrated by FIG. 7C, as opposed to, for example, Halbach array 504 of FIG. 5, with is positioned on one side of the conductor at rest).

[0080] FIG. 7D is an illustration of a side cross-sectional view of a vibration dampener 750 including a stacked radial Halbach 755. Vibration dampener 750 can be substantially the same as vibration dampener 710, except vibration dampener 750 includes a stacked radial Halbach 755, which can be a stacked configuration of multiple radial Halbach arrays 700A-E. While the illustrated stacked radial Halbach array 755 includes five radial Halbach arrays 700, more or fewer individual radial Halbach arrays could be used.

[0081] The embodiments of FIG. 7A-D could also be created in the inverse. In other words, the magnetic field can be concentrated on the inside of the Halbach array and a conductor (such as a tube or solid rod) could be placed through the aperture (for example, aperture 703 of Halbach 700) at the center of the Halbach array such that the Halbach array travels along the conductor. In such a case, either the rod / tube or the Halbach array could be attached to the object to be dampened, and the other of the rod / tube and Halbach array can be left to move with respect to the object.

[0082] FIG. 8A is an illustration of a perspective view of an example flat Halbach array26183813046.1Attorney Docket No. 370532.00202 800. Flat Halbach array 800 can be constructed substantially as described with respect to Halbach array 10 of FIG.1. Halbach array 800 can be constructed of three or more individual permanent magnets 802A-E. The magnets 802A-E of Halbach array 800 can have orientations as shown by the arrows in FIG. 8A to create a Halbach array having a concentrated magnetic field along top surface 804. Given the relative dimensions of flat Halbach array 800, it may be more suitable for adhesive or laminate construction (as opposed to a fastener). Flat Halbach array 800 can be used in an flat vibration dampening arrangement 810, as shown in FIG. 8B. Flat Halbach arrangement 810 can include a Halbach array 800 and a flat conductor 820. As Halbach array 800 moves relative to conductor 820, eddy currents can be created in conductor 820. Conductor 820 can be fixed to an object to be dampened. Arrangement 810 can be disposed in a housing to enclose it and secure the magnetic array. Additionally, as depicted in FIG. 8C, arrangement 810 can include one or more reset magnets 830A,B to bias Halbach array 800 to a particular portion of conductor. For example, as picture, reset magnets 830A,B could repel Halbach array 800 and bias Halbach array 800 to corner 22 of conductor 800. As another example, two additional reset magnets could be placed on the edges of conductor 800 across from reset magnets 830A,B and be configured to repel Halbach array 800. Accordingly, if the magnets are of substantially similar strength, Halbach array 800 could be biased toward the center of conductor 800.

[0083] As explained above, arrangement 810 can form a vibration dampener. Arrangement 810 can be disposed within a housing and the housing can be attached to an object to damp motion of the object (such as vibration or shock). The housing can be attached to the object by various suitable methods such as, but not limited to, adhesive, welding fasteners, clamps, additional magnets, etc. In some embodiments, the Halbach magnetic array of arrangement 810 can be fixed relative to the object and the electrically-conductive member (i.e., conductor 800) can27183813046.1Attorney Docket No. 370532.00202 move relative to the magnetic array and the object. Tn some embodiments, the Halbach array can be configured to have a concentrated magnetic field on two sides such that one concentrated magnetic field can hold the Halbach array and / or housing to the object and another concentrated magnetic field can interact with the electrically-conductive member to generate eddy currents and provide the dampening effect.

[0084] FIG. 9 is an illustration of an example vibration dampener 900. Vibration dampener 900 is similar to vibration dampener 500 of FIG. 5, except that it is in a curved configuration. In some embodiments, for example, as depicted, both conductor 902 and Halbach array 904 can be curved. The curved configuration can aid in dampening along multiple axes of an object or be used in a thin configuration to match a curve of an object. Curved Halbach array 904 can be a portion of a radial Halbach array (for example, like that illustrated in FIG. 7A or similar).

[0085] The foregoing merely illustrates the principles of the disclosure. Any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims. Those skilled in the art will readily recognize various modifications and changes that may be made without following the example embodiments and applications illustrated and described herein, and without departing from the true spirit and scope of the following claims.

[0086] Without excluding further possible embodiments, certain example embodiments are summarized in the following clauses:

[0087] Clause 1. A dampening device configured to damp motion of an object, the dampening device comprising: a magnetic array comprising three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array; and an electrically-conductive member28183813046.1Attorney Docket No. 370532.00202 positioned around the magnetic array, wherein: the electrically-conductive member is configured to be fixed to the object; and the magnetic array is mounted for movement in relation to the electrically conductive member; and the electrically-conductive member is positioned within the concentrated magnetic field of the magnetic array such that when the magnetic array moves relative to the electrically conductive member, an eddy current generated within the electrically-conductive member by the magnetic array resists relative movement between the electrically-conductive member and the magnetic array.

[0088] Clause 2. A dampening device configured to damp motion of an object, the dampening device comprising: a first magnetic array comprising three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array; and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

[0089] Clause 3. A dampening device configured to damp motion of an object, the dampening device comprising: a first magnetic array comprising three or more permanent magnets arranged as a Halbach array to create a concentrated magnetic field around a portion of the magnetic array; and an electrically-conductive member positioned within the concentrated magnetic field.

[0090] Clause 4. The dampening device of any of clauses 1-3, further comprising a second magnetic array.

[0091] Clause 5. The dampening device of clause 4, wherein the second magnetic array comprises three or more permanent magnets arranged together with alternating radial and29183813046.1Attorney Docket No. 370532.00202 tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array.

[0092] Clause 6. The dampening device of clause 5, wherein the second magnetic array is configured to repel the first magnetic array.

[0093] Clause 7. A dampening device configured to damp motion of an object, the dampening device comprising: a segmented ring magnetic array comprising a plurality of magnetized sections, the sections being aligned such that they form a magnetic field that is concentrated along an outer portion of the segmented ring magnetic array; and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

[0094] Clause 8. A dampening device configured to damp motion of an object, the dampening device comprising: a segmented ring magnetic array comprising a plurality of magnetized sections, the sections being aligned such that they form a magnetic field that is concentrated along an inner portion of the segmented ring magnetic array; and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

[0095] Clause 9. The dampening device of clause 7 or 8, further comprising a second magnetic array.

[0096] Clause 10. A dampening device comprising: a first magnetic array comprising a plurality of magnetized sections, the sections being aligned such that they form a magnetic field that is concentrated along a portion of first magnetic array; a second magnetic array30183813046.1Attorney Docket No. 370532.00202 comprising a plurality of magnetized sections, the sections being aligned such that they form a magnetic field that is concentrated along a portion of second array; and a conductor; wherein: the first and second magnetic arrays are positioned relative to the conductor such that a force exerted on the dampening device causes relative movement between 1) at least one of the first magnetic array or the second magnetic array and 2) the conductor; the conductor is positioned within the concentrated magnetic fields of both the first magnetic array and the second magnetic array; and the device is configured to dissipate the force at least in part through eddy currents generated in the conductor.

[0097] Clause 11. The dampening device of any of the preceding clauses, further comprising a housing, wherein the electrically conductive member and magnetic array(s) are disposed within the housing.

[0098] Clause 12. The dampening device of clause 1, wherein the housing includes a thermal insulation layer.

[0099] Clause 13. The dampening device of any of the preceding clauses, further comprising one or more end caps.

[0100] Clause 14. The dampening device of any of the preceding clauses, further comprising a reset magnet.

[0101] Clause 15. The dampening device of clause 14, wherein the reset magnet is configured to bias the magnetic array towards a first portion of the electrically conductive member.

[0102] Clause 16. A dampening device configured to damp motion of an object, the dampening device comprising: a first magnetic array comprising three or more magnets arranged as a Halbach array to create a concentrated magnetic field around a portion of the magnetic31183813046.1Attorney Docket No. 370532.00202 array; and an electrically-conductive member configured as a flat sheet and positioned within the concentrated magnetic field.

[0103] Clause 17. The dampening device of clause 16, further comprising a housing.

[0104] Clause 18. The dampening device of clause 17, further comprising a first reset magnet configured to repel or attract the magnetic array.

[0105] Clause 19. The dampening device of clause 18, further comprising a second reset magnet configured to repel or attract the magnetic array.

[0106] Clause 20. The dampening device of clause 19, wherein the first reset magnet and the second reset magnet are configured to bias the magnetic array to a first portion of the electrically-conductive member.

[0107] Clause 21. The dampening device of clause 20, wherein the first portion of the electrically-conductive member is an area opposite the first reset magnet and the second reset magnet.

[0108] Clause 22. The dampening device of clause 19, further comprising a third reset magnet and a fourth reset magnet.

[0109] Clause 23. The dampening device of clause 22, wherein the first reset magnet, the second reset magnet, the third reset magnet, and the fourth reset magnet are configured to bias the magnetic array to a center portion of the electrically-conductive member.

[0110] Clause 24. A dampening device configured to damp motion of an object, the dampening device comprising a first magnetic array comprising three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array; and an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such32183813046.1Attorney Docket No. 370532.00202 that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

[0111] Clause 25. The dampening device clause 24, wherein the electrically-conductive member is configured to be fixed to the object.

[0112] Clause 26. The dampening device clause 24, wherein the electrically-conductive member is a tube and the magnetic array is disposed within the tube.

[0113] Clause 27. The dampening device of clause 26, further comprising a second magnetic array disposed within the tube.

[0114] Clause 26. The dampening device of clause 26, further comprising a first end cap and a second end cap, wherein the first end cap encloses a first end of the tube and the second end cap encloses a second end of the tube.

[0115] Clause 27. The dampening device of clause 26, further comprising a first reset magnet.

[0116] Clause 28. The dampening device of clause 27, wherein the first reset magnet is configured to bias the magnetic array to a first end of the tube.

[0117] Clause 29. The dampening device of clause 28, wherein the first reset magnet repels the magnetic array.

[0118] Clause 30. The dampening device of clause 28, wherein the first reset magnet is disposed at a second end of the tube.

[0119] Clause 31. The dampening device of clause 28, wherein the first reset magnet is configured to attract the magnetic array and the first reset magnet is disposed at a second end of the tube.33183813046.1Attorney Docket No. 370532.00202

[0120] Clause 32. The dampening device of clause 28, further comprising a second reset magnet.

[0121] Clause 33. The dampening device of clause 32, wherein the first reset magnet and the second reset magnet are configured to repel the magnetic array.

[0122] Clause 34. The dampening device of clause 32, wherein the first reset magnet is configured to repel the magnetic array and the second reset magnet is configured to attract the magnetic array.

[0123] Clause 35. The dampening device of any of the preceding clauses where the magnetic array is separated from the corresponding electrically-conductive member by a gap.

[0124] Clause 36. The dampening device of clause 35, wherein the gap is less than about 3mm.

[0125] Clause 37. The dampening device of clause 35, wherein the gap is less than about 1mm.

[0126] Clause 38. The dampening device of any of the preceding clauses, wherein the electrically conductive member has a varying thickness.

[0127] Clause 39. The dampening device of any of the preceding clauses, wherein the electrically conductive member is a laminate or composite structure.

[0128] Clause 40. A power tool comprising the dampening device of any of the preceding clauses.

[0129] Clause 41. A firearm comprising the dampening device of any of the preceding clauses.

[0130] Clause 42. A firearm accessory comprising the dampening device of any of the preceding clauses.34183813046.1Attorney Docket No. 370532.00202

[0131] Clause 43. The firearm accessory of clause 42, further comprising at least one of : an M-LOK attachment, a KEYMOD attachment, a picatinny rail clamp, or an ARCA / SWISS clamp.

[0132] Clause 44. A helmet comprising the dampening device of any of the preceding clauses.35183813046.1

Claims

Attorney Docket No. 370532.00202CLAIMS1. A dampening device configured to damp motion of an object, the dampening device comprising:a first magnetic array comprising three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array;an electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

2. The dampening device claim 1, wherein the electrically-conductive member is configured to be fixed to the object.

3. The dampening device claim 1, wherein the electrically-conductive member is a tube and the magnetic array is disposed within the tube.

4. The dampening device of claim 3, further comprising a second magnetic array disposed within the tube, wherein the second magnetic array comprises three or more permanent magnets arranged together with alternating radial and tangential magnetization to create a concentrated magnetic field around a portion of the magnetic array.36183813046.1Attorney Docket No. 370532.002025. The dampening device of claim 3, further comprising a first end cap and a second end cap, wherein the first end cap encloses a first end of the tube and the second end cap encloses a second end of the tube.

6. The dampening device of claim 3, further comprising a first reset magnet.

7. The dampening device of claim 6, wherein the first reset magnet is configured to bias the magnetic array to a first end of the tube.

8. The dampening device of claim 7, wherein the first reset magnet repels the magnetic array.

9. The dampening device of claim 7, wherein the first reset magnet is disposed at a second end of the tube.

10. The dampening device of claim 7, wherein the first reset magnet is configured to attract the magnetic array and the first reset magnet is disposed at a second end of the tube.

11. The dampening device of claim 7, further comprising a second reset magnet.

12. The dampening device of claim 11, wherein the first reset magnet and the second reset magnet are configured to repel the magnetic array.37183813046.1Attorney Docket No. 370532.0020213. The dampening device of claim 11, wherein the first reset magnet is configured to repel the magnetic array and the second reset magnet is configured to attract the magnetic array.

14. The dampening device of claim 1, wherein the first magnetic array and the electrically conductive member are separated by a gap.

15. The dampening device of claim 14, wherein the gap is less than about 1 mm.

16. The dampening device of claim 14, wherein the gap is less than about 3 mm.

17. A dampening device configured to damp motion of an object, the dampening device comprising:a segmented ring magnetic array comprising a plurality of magnetized sections, the sections being aligned such that they form a magnetic field that is concentrated along either an outer portion or an inner portion of the segmented ring magnetic array; andan electrically-conductive member positioned within the concentrated magnetic field of the magnetic array such that relative motion between the first magnetic array and the electrically-conductive member generates an eddy current in the electrically-conductive member that resists the relative motion.

18. The dampening device of claim 14, wherein:38183813046.1Attorney Docket No. 370532.00202the sections of the segmented ring magnetic array are aligned such that they form a magnetic field that is concentrated along an inner portion of the segmented ring magnetic array; andthe electrically-conductive member is positioned within an aperture of the inner portion of the segmented ring magnetic array.

19. The dampening device of claim 14, wherein:the sections of the segmented ring magnetic array are aligned such that they form a magnetic field that is concentrated along an outer portion of the segmented ring magnetic array; andthe segmented ring magnetic array is disposed within the electrically-conductive member.

20. The dampening device of claim 14, further comprising a reset magnet configured to bias the segmented ring magnetic array toward a first portion of the electrically conductive member.39183813046.1

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