Abstract:
A supporting frame and magnetic cradle for playing a harmonica hands-free, the frame providing two positions: a “playing” position for rigidly supporting the harmonica in proximity to the mouth and an “at-rest” position for retaining the harmonica within reach but out of the way. The frame provides means for pivoting the harmonica between the two positions and a memory hinge feature so that, once adjusted, the preferred playing position is reliably recovered at each use. A magnetic lock is used to secure the harmonica to its playing cradle, unexpectedly improving the sound quality. Multiple harmonicas may be magnetically exchanged in and out of the cradle, permitting the musician to quickly and flexibly change keys, timbre, or add tremolo, for example, during a performance. The frame does not interfere with simultaneous performance with other instruments, such as guitar or microphone, and thus finds use for a soloist musician.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to U.S. Provisional Patent No. 61/527,010, titled “Harmonica Support with Magnetic Cradle”, filed Aug. 24, 2011, which is herein incorporated in full for all purposes. 
     
    
     FIELD OF THE INVENTION 
       [0002]    This invention is related to an apparatus for ergonomically playing a harmonica while the musician&#39;s hands are otherwise occupied, and includes a magnetic cradle for the harmonica, a supporting frame with shoulder engaging member and harmonica pivoting member, and a memory locking hinge for pivoting the frame members between a preselected playing position and an at-rest position. 
       BACKGROUND 
       [0003]    The present invention relates generally to hands-free playing of a harmonica, also termed a “mouth organ.” The harmonica is traditionally a hand-held instrument. However, musicians who wish to play a harmonica while also playing another instrument are in need of a support frame for the harmonica which frees their hands. Using a support frame, the musician can also play a guitar, a horn, or hold a microphone, for example. 
         [0004]    Shoulder-supported harmonica holders have been in use for over 100 years, and were initially fixed angle frames. As popularized by Bob Dylan in the 1960s, a typical modern harmonica holder incorporates the use of two pivoting sections, a harmonica supporting section and a shoulder engaging section, with provision for folding or pivoting the two sections to allow adjustment and also to fold the holder for transport. 
         [0005]    Frames of the prior art having a variable pivot angle were realized using a fastener, such as a wing nut, to loosen, adjust and retighten the pivot angle between the two sections. A device of this type is illustrated in U.S. Pat. No. 5,608,177 (FIG. 1, no. 37). While this feature seems straightforward, the threaded fasteners are stripped by repeated use and the axle joint can slip unexpectedly when the musician leans into the harmonica. There is no remedy a musician can take once this has occurred, except to stop mid-performance and re-align and retighten the pivot angle. U.S. Pat. No. 5,619,001 (see FIG. 5, no. 68) offers a hinge joint having mating serrated tooth hubs which prevent slipping, but the threaded knob that forces the teeth into engagement requires both hands, first to select a position and tighten the hinge, test out the position relative to the mouth, and then readjust as necessary to find a preferred playing position, not a fully satisfactory solution. 
         [0006]    Illustrated in U.S. Pat. No. 5,619,001 (see FIG. 2, nos. 18-26) is a spring-loaded harmonica mounting contraption that is both cumbersome to manage (requiring two hands to facilitate removal and installation of a harmonica to the holder) and to some degree or another detrimental to the aesthetic of the harmonica, its player&#39;s line of sight, the audiences&#39; view of the player, and can slip or damage the harmonica. In one instance (the Sonnenschein SLK Harmonica Rack V2) a spring-tensioned, rubberized bar is used to clamp the harmonica, but the device is so large as to practically conceal the performer. 
         [0007]    A similar structure is illustrated in U.S. Design Pat. No. D633554, although the clamping mechanism is somewhat indistinct and it would appear that the hinge release requires a tool for making adjustments and hence cannot be viewed as a quick release mechanism. A quick release feature has not been achieved that allows the musician to move a harmonica out of the way when desired, and to return the harmonica to a preferred playing position when needed. To be more useful, any quick release feature would benefit from an adjustably positionable locking mechanism with memory feature so that a preferred playing position preset by the musician ahead of time is not lost when the hinge is pivoted. 
         [0008]    Also unrealized is a provision for mounting a second or backup harmonica on the frame; a second diatonic harmonica for example, which would be used extensively by musicians who&#39;s music changes key from one song to the next. The solution offered by U.S. Pat. No. 5,929,352 (and also U.S. Pat. No. 1,954,169), where clips are used to hold multiple harmonicas on a revolving wheel, would seem overly cumbersome and large. Thus there are unresolved needs in the art; and a harmonica holder which overcomes the above and other disadvantages has long been sought. 
       SUMMARY 
       [0009]    Disclosed is a harmonica holder with a “magnetic cradle” for hands-free playing of a harmonica. The apparatus comprises shoulder yoke adapted to be ergonomically worn over the shoulders of a musician; a harmonica support member adapted to be worn in front of the musician; the harmonica support member including a centrally positioned cradle for holding the harmonica; the cradle having a generally planar aspect and anteriosuperior raised lip for engaging an anterioinferior aspect of the harmonica; a magnetic member disposed in the cradle so that the cradle is magnetized with a pull force calibrated to hold the harmonica in the cradle during hands-free playing and to release the harmonica when not needed. Unexpectedly, the magnetic cradle was found to act on the magnetically susceptible coverplate of a harmonica without distorting the sound of the music. Magnetic cradles having a pull force of 7 to 15 pounds enable the musician to detachably place a harmonica in the cradle, and exchange that harmonica for a second harmonica. The magnetic force operates in concert with the raised lip to secure the harmonica for hands-free playing. By placing a second magnet on the harmonica holder frame, the second harmonica may be secured within easy reach. 
         [0010]    Technologically, magnetically attaching fixtures would not be expected to be compatible with playing a harmonica. The vibrating parts that give the harmonica its sound, if influenced by the magnet, would presumably not function properly and the sound would be changed or weakened. However, the vibrating reeds or comb are typically made of brass and the soundbox is made of wood, and hence are not magnetically susceptible. Yet if the entire harmonica were made of brass or wood, there would be no attraction at all. Brass and wood are valued for musical instruments because they vibrate with richer tonal layers than steel and many musical instruments are made entirely of brass or wood. However, my testing has shown that a magnetic field does not interfere with or dampen the musical performance of a classical harmonica. The soundmaking part of the harmonica is magnetically inert, but the coverplates of the harmonica are typically steel and hence can be affixed by a magnet instead of requiring holding the harmonica. Almost magically, the synergy of a magnetic cradle for playing a fixedly supported harmonica, given this peculiar and unique juxtaposition of materials, has not previously been realized and its realization here is an advance in the art. 
         [0011]    Perhaps just as surprisingly, the magnetic harmonica holder of the invention is free of the squeaks, rattles, and clicks caused by metal-on-metal contact, as was noted as a disadvantage of prior art, spring-loaded harmonica holders by Doll (U.S. Pat. No. 4,739,686, col. 2 lines 11-14). It would be expected that a harmonica in contact with a magnet would also chatter or beat when played, but I have discovered that this is not so; that the sound quality of a magnetically affixed harmonica when played is equivalent or undampened when compared to that of a hand-held harmonica. Also, the magnetic cradle permits the user to grasp the harmonica with less interfering clamp structure, so that the sound can be manually modulated. 
         [0012]    Doll, in the &#39;686 reference, further teaches that the metal coverplates of the harmonica should not be contacted by the restraining members, indicating that such contacts “tend to product rattles, squeaks, clicks and the like.” Thus the harmonica holder of the invention advantageously overcomes known disadvantages of the prior art, which would discourage and teach one skilled in the art away from the inventive solution I have found. 
         [0013]    In another aspect of the invention, a second magnet may be disposed on the shoulder frame, the second magnet for magnetically securing the second harmonica within easy reach. This is advantageous for musicians who wish to use two or more harmonicas during a performance and can benefit from a quick switch. The magnetic force of the magnets is selected so that the musician can readily detach one harmonica from the magnetic cradle and exchange it for the second harmonica in an instant. 
         [0014]    In another embodiment, the harmonica cradle is pivotable on the shoulder frame between a “playing position” (such that the cradle is proximate to the face of the musician and the harmonica is positioned for engaging the musician&#39;s mouth) and an “at-rest position” (such that the cradle and harmonica are out of the way). The holder allows the musician to pivot the harmonica between the two positions with minimal effort and time. Advantageously, the pivot or hinge structure includes a “memory locking mechanism” so that as the apparatus is pivoted, the harmonica will “drop” or “lock” into a preferred, preset playing position the musician has selected in advance. Generally the apparatus includes mechanical means for adjusting the position of the harmonica to fit the musician&#39;s dimensions and performance style. 
         [0015]    In yet another embodiment, a harmonica holder with magnetic cradle for hands-free playing of a harmonica includes a shoulder yoke adapted to wear the harmonica holder on the shoulders of a musician; a harmonica support frame or member to be worn in front of the musician, and a cradle riser section or strut centrally disposed on the support frame for supporting a harmonica cradle, the harmonica cradle comprising: i) a generally planar surface and a raised lip for engaging an anterioinferior aspect of the harmonica; and ii) a magnet disposed in the cradle. The magnet acts in concert with the lip to reversibly stabilize the harmonica during playing, and is configured with a pull force rated to hold the harmonica in the cradle (for hands-free playing in the cradle) and to release the harmonica when needed, generally acting in concert with the raised lip. The center pivot allows the harmonica and cradle to be pivotable between a playing position such that the harmonica cradle is proximate to the face of the musician and an at-rest position such that the harmonica cradle is displaced from the face. The center pivot of the cradle riser section is preferredly configured with a memory locking feature so that the musician can adjust, preset and lock in the playing position and return to it at any time. 
         [0016]    Harmonica support holders of the invention are optionally configured with a “double elbow” for adjusting the playing position according the preference of the musician. 
         [0017]    The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings, in which preferred embodiments of the invention are illustrated by way of example. It is to be expressly understood, however, that the drawings are for illustration and description only and are not intended as a definition of the limits of the invention. The invention does not necessarily reside in any one of these features taken alone, but rather in the particular combination of all of its structures for the functions specified. 
         [0018]    Those skilled in the art will appreciate that the inventive concepts upon which this disclosure is based readily may be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    The teachings of the present invention are more readily understood by considering the drawings, in which: 
           [0020]      FIG. 1  is a perspective view of a first harmonica holder of the invention. The harmonica is magnetically secured in a magnetic cradle and the cradle is elevated in a “playing position”. Also shown is a yoke which goes over the shoulders and behind the neck. 
           [0021]    In  FIGS. 2 and 3 , the harmonica holder is rotated so that the apparatus can be seen from the perspective of the musician. 
           [0022]      FIG. 4  illustrates the apparatus of the preceding figures, but the harmonica is in an “at-rest” position. A memory locking hinge permits the vertical strut to be repositioned (double arrow) between an upright and an inverted or reclining position. 
           [0023]      FIG. 5  is a detailed view of the cradle riser with vertical strut and harmonica cradle with magnet. 
           [0024]      FIG. 6  is a perspective view of the harmonica cradle and magnet of a cradle riser, without the harmonica. 
           [0025]      FIGS. 7A ,  7 B and  7 C are component views of an operable locking memory hinge assembly on a cradle riser. 
           [0026]      FIGS. 8A through 8C  depict action views of a memory lock feature. 
           [0027]      FIG. 9  is view of a second embodiment of the harmonica holder of the invention. The apparatus has a prominent hinge for raising and lowering the harmonica to and from the mouth. The hinge is provided with an alternative construction of a memory lock. 
           [0028]      FIG. 10  depicts a harmonica holder that has been unfolded. Features of the memory locking hinge are illustrated. Features for adjusting the frame are also shown. 
           [0029]      FIGS. 11A ,  11 B and  11 C are action views of a hinge with memory lock. 
           [0030]      FIG. 12  is a view of an embodiment  300  of the invention configured for two harmonicas ( 1   a ,  1   b ), where the harmonicas can be quickly exchanged. Both harmonicas are magnetically secured to the frame. 
           [0031]      FIG. 13  is a perspective side view of yet another embodiment, harmonica holder  400  of the invention, the embodiment having a wire frame with memory locking hinge and adjustable detents. 
           [0032]      FIG. 14  is a perspective front view of harmonica holder  400 , showing yet another embodiment of a magnetic cradle and memory locking hinge. 
           [0033]      FIG. 15  is a perspective rear view of harmonica holder  400 . 
           [0034]      FIG. 16  is a side view of harmonica holder  400 . 
           [0035]      FIG. 17  is a detail view of a first hinge assembly of harmonica holder  400 . 
           [0036]      FIG. 18  is an exploded view of a hinge assembly with memory locking hinge. 
           [0037]      FIGS. 19A and 19B  depict the memory locking slot action of the hinge assembly depicted in  FIG. 18 . 
       
    
    
       [0038]    The drawings are not necessarily to scale. Certain features or components herein may be shown in schematic form and some details of conventional elements, such as nuts, washers and pins, are not shown in the interest of clarity and conciseness. 
       NOTATION AND NOMENCLATURE 
       [0039]    Certain terms throughout the following description are used to refer to particular features, steps or components, and are used as terms of description and not of limitation. As one skilled in the art will appreciate, different persons may refer to the same feature, step or component by different names. Components, steps or features that differ in name but not in function or action are considered equivalent and not distinguishable, and may be substituted herein without departure from the invention. Certain meanings are defined here as intended by the inventors, i.e., they are intrinsic meanings. Other words and phrases used here take their meaning as consistent with usage as would be apparent to one skilled in the relevant arts. 
         [0040]    The harmonica of the invention is not limited to a particular type of harmonica. Included are “diatonic”, “chromatic”, “tremolo”, “orchestral” and “cheng gong” harmonicas, which have a sliding mouthpiece member. 
         [0041]    “Diatonic harmonicas” are very common for blues, folk and street performances, and typically have a limited number of notes prescribed by the key signature. For example, a harmonica that is diatonic to C major has the notes C, D, E, F, G, A and B, but no sharps or flats; a harmonica that is diatonic to C# major has the notes C#, D#, E#, F#, G#, A# and B#, but no flats or naturals; and so on. Generally two reed plates are supplied, one for exhalation and the other for inspiration (also termed “draw”), where the various notes can be played only on one or the other reed. Thus several harmonicas may be needed to play a medley of musical pieces, or to change keys in the middle of a song. 
         [0042]    Double reed diatonics such as octave and tremolo instruments, where each note is sounded by a pair of reeds are also known. Chromatics typically permit the performer to play a full musical scale, but are heavier and larger and may require a larger cradle and stronger magnet. 
         [0043]    “Coverplates” are metal plates, generally of steel or other ferromagnetic material, that are fastened to the top and bottom of a harmonica comb, thereby serving as the outside top and bottom surfaces of the instrument, typically the surfaces contacted by the hand when played. 
         [0044]    “Comb” and “soundbox” relate to the interior body of the harmonica that channels air to the reeds. 
         [0045]    “Magnetic cradle” or “magnetic harmonica cradle” relate to a fixed support surface that has been magnetized so as to securely hold a harmonica on the support surface when played without hands. A lip is generally associated with the support surface and is configured to prevent the harmonica from slipping away from the mouth of the musician. 
         [0046]    A preferred magnetic cradle also permits the musician to grasp the harmonica in place, such as with a cupping motion for modulating the sound, or in a picking up motion for dismounting and/or exchanging the harmonica without the necessity for a mechanical release or latching mechanism which would slow the process or require tools and additional adjustment. 
         [0047]    “Cradle riser” is a structural element of the frame which extends from a spanning member bridging the right and left arms of the neck or shoulder yoke to the harmonica. The cradle riser supports the magnetic cradle that holds the instrument. The cradle riser is provided with a hinge so that it may be rotated from an “at rest” position which is generally inverted or prone (relative to the hinge) to a playing position which is generally upright and elevated (relative to the hinge), thus providing a freespace whereby the musician is readily able to engage the mouthpiece of the harmonica. The cradle riser may be a “tee-shaped” element or a “rainbow arch” shaped element, while not limited thereto. 
         [0048]    A “memory locking” feature refers to a harmonica holder pivot mechanism or assembly with detent so that the angle between the shoulder yoke and the harmonica support frame or cradle riser may be varied between an at-rest position and a playing position such that the angle is preset according to the musician&#39;s preference. The memory locking mechanism allows the musician to releasably lock the harmonica in a preferred playing position and to unlock the holder so that the harmonica can be angled away from the musician&#39;s mouth when not in use. 
         [0049]    Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment and may apply to multiple embodiments. Furthermore, particular features, structures, or characteristics of the invention may be combined in any suitable manner in one or more embodiments. 
         [0050]    “Conventional”—refers to a term or method designating that which is known and commonly understood in the technology to which this invention relates. 
         [0051]    Unless the context requires otherwise, throughout the specification and claims which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open, inclusive sense, that is as “including, but not limited to”. 
         [0052]    The appended claims are not to be interpreted as including means-plus-function limitations, unless such a limitation is explicitly recited in a given claim using the phrase “means for.” 
       DETAILED DESCRIPTION 
       [0053]    Referring to  FIGS. 1 through 19 , wherein like reference numerals refer to like components in the various views, there is illustrated a new and improved harmonica holder in several views and multiple embodiments, generally denominated  100 ,  200 ,  300  and  400  herein. In the various views, a harmonica is generally denominated as  1  throughout. 
         [0054]      FIG. 1  is a perspective view of a first harmonica holder  100  of the invention. The harmonica holder is essentially a frame for supporting a harmonica  1 , and includes a shoulder yoke member  101  which is supported on the shoulders or neck of the musician playing the harmonica; and a harmonica support member having a spanning section  102  joined to the shoulder yoke at right and left elbows  103  and a cradle riser section  104  hinged on the spanning section at central pivot  105 . 
         [0055]    The cradle riser includes a generally planar platform  106  with magnet, termed here a “magnetic harmonica cradle,” for securing and supporting the harmonica in the “playing position”, with harmonica upright and accessible to the musician. This apparatus permits the musician to play the harmonica without use of hands; the hands generally being kept free for playing a second instrument such as a guitar. 
         [0056]    In  FIGS. 2 and 3 , the harmonica holder is rotated so that the apparatus can be seen from the perspective of the musician on whose neck and shoulders the shoulder yoke  101  rests. 
         [0057]    As can be appreciated from  FIG. 2 , pivots  103  and  105  are both adjustable, thus the harmonica support member  107  is “double elbowed” and can be adjusted over a wide range of vertical positions to suit the user. 
         [0058]    Pivot  105  is formed at the junction of a right spanning section  102   a  and a left spanning section  102   b  and may include a memory lock feature as will be described below. 
         [0059]      FIG. 3  depicts the harmonica holder  100  rotated more as would be experienced by the user, with a hoop section of the shoulder yoke  101  slipped over the head as viewed from behind. The harmonica is in the upright playing position in proximity to the mouth of the musician in this view. 
         [0060]    In an optional embodiment, not shown, the shoulder yoke may be formed of two separate pieces, each an inverted “U” or hook, one each to engage the right and left shoulders so that the apparatus is readily removed and is hooked on the shoulders, not the neck, if preferred. 
         [0061]      FIG. 4  illustrates the apparatus of the preceding figures, but the harmonica is in an “at-rest” position. A memory locking hinge permits the cradle riser  104  to be repositioned (double arrow) between an upright and an inverted or reclining position. 
         [0062]    The cradle riser section  104  is seen to rotate clockwise around pivot  105 , and is shown in this view in an “at rest” position on the chest of the user. In the at-rest position, the harmonica is not in use, but is readily accessible when needed. The musician has only to rotate the cradle riser in the counterclockwise direction to bring the harmonica into the “playing position” as shown in  FIG. 1 . This motion is depicted by a double arrow. The harmonica ( 1 ) is magnetically secured in a magnetic harmonica cradle  106  and will not drop off the holder when inverted. 
         [0063]      FIG. 5  is an elevation view of the cradle riser  104  and harmonica cradle assembly  106 . Shown is the cradle assembly with a topmost channel bar  106   a.  A magnet  110  is secured in the channel. As can be appreciated in this side view, the bottom coverplate  2  of the harmonica  1  is magnetically affixed to the magnet  110 . The anterior lip  111   a  of the channel bar engages the anterior lip of the harmonica to prevent slippage when the musician leans into the mouthpiece  3  of the harmonica. The surfaces can be padded if desired to prevent scratching. The vertical strut of the cradle riser may be curved to provide the musician better access to the mouthpiece. 
         [0064]      FIG. 6  is a perspective view of the harmonica cradle and magnet, without the harmonica. Magnet  110  and channel bar  106   a  are assembled as magnetic harmonica cradle assembly  106 . The musician has only to lay the harmonica in the cradle and the harmonica is retained by the magnetic action and by the groove of the channel. Surprisingly, the harmonica can be played in this position with no loss of acoustic properties and without hands. 
         [0065]      FIGS. 7A ,  7 B and  7 C are component views of an operable locking memory hinge assembly.  FIG. 7A  depicts the two primary components of the cradle riser assembly  104 , a magnetic harmonica cradle  106  supported by a vertical strut. In side view, as shown in  FIG. 7B  in more detail, the cradle  106  supports magnet  110  and is bounded by anterior and posterior lips  111   a/b . The vertical strut defines on its lower aspect a pivot opening  112  configured with memory slot mechanism, consisting here of a hub  113  for engaging an axle bolt and a locking keyway  114 .  FIG. 7C  depicts a threaded axle bolt  115  with medial slot  115   a  and journalled surface for engaging the hub of the pivot opening  112 . 
         [0066]      FIGS. 8A through 8C  depict action views of a first memory lock feature. Strut  104  defining pivot opening  112  slides over slotted axle bolt  115  through hub  113 . The center slot  115   a  in the bolt engages locking keyway  114  of the cradle riser in the locked position as shown in  FIG. 8C , but the cradle riser is free to rotate between the playing position and the at-rest position as shown in  FIG. 8B . The musician has only to lift the harmonica cradle and cradle riser from its locked position in  FIG. 8C  and so that the harmonica support member can rotate clockwise or counterclockwise on hub  113  and axle bolt  115 . 
         [0067]    The orientation of the slot  115   a  of the axle bolt is adjustable by the user with respect to center tabs in the right and left spanning members  102  (as evident in  FIG. 1 ). Accessory fasteners can be used to tighten the axle bolt in its preferred position. The keyway  114  then “remembers” the pivot angle the user has selected and will return to it each time the keyway is engaged. This memory locking feature allows the musician to quickly return the harmonica to the playing position when needed. When the keyway is “dropped” onto the slot  115   a  as shown in  FIG. 8C  (double arrow), the harmonica is disengageably “locked” in the preferred upright playing position as adjustably configured by the user. 
         [0068]      FIGS. 9 through 19  show alternative embodiments of the inventive apparatus. As will be readily appreciated, other variations on these exemplary structures may be constructed according the teachings of the invention. 
         [0069]      FIG. 9  is view of a second embodiment  200  of the harmonica holder of the invention. The apparatus includes two subassemblies, a shoulder hoop  201  and a harmonica support hoop or member  202 . The two subassemblies of the frame are joined at pivot  203 . 
         [0070]    Both hoops of the frame are adjustable ( 205 ,  206 ) to fit the user. The hinge is provided with an alternative construction of a memory lock with locking cam or detent  207  and cam follower or detent wheel  208 , as will be described below. 
         [0071]    Magnet  210  is used for securing harmonica to the magnetic harmonica cradle  211 , which rests on a “hooped” or “arched” section  202  of the frame that can be pivotably raised and lowered from the musician&#39;s mouth (double curved arrow). A bar magnet is shown in the cradle, but other forms of magnets may be used so as to secure the harmonica; alternatively the cradle may be formed of a magnetic member, for example, or the magnet may be attached to the outside of the cradle so that lines of magnetic force are conducted by a magnetically susceptible cradle material to magnetize the cradle. 
         [0072]      FIG. 10  depicts the harmonica holder  200  in an unfolded state. Features of the memory hinge are illustrated. Pivot  203  joins the harmonica support assembly  213  and the shoulder yoke assembly  214 . The cam indent  207  is contoured and radiused to rotate and engage the cam follower wheel  208  at a preselected angle (shown in the engaged position in  FIG. 9 ). 
         [0073]    Slot  215  functions analogously to the keyway  114  of  FIG. 7 . This is shown in more detail in  FIGS. 11A-11C . Three action views depict, respectively, the hinge in a locked, released, and relaxed position. Cam wheel  208  can rotate freely and is a part of the shoulder yoke assembly  214 . In  FIG. 11A , slot  215  is seen to ride on pin  216 . The cam surface  207  ( FIG. 11B ) of the magnet support arm  213  fully engages and locks on the cam wheel  208 . In this position, the harmonica is rigidly positioned in the playing position, essentially as shown in  FIG. 9 . 
         [0074]    By lifting the harmonica support arm  213  on pin  216  away from the cam follower wheel  208  as shown (double arrow) in  FIG. 11B , the hinge  203  can be unlocked to pivot. Slot  215  is guided on pin  216  in making this motion. The cam surfaces can then be rotated counterclockwise (away from the chest), allowing the harmonica to drop away from the musician&#39;s mouth. In  FIG. 11C , the harmonica support arm  213  is in an inverted position “at-rest”, with the harmonica hanging down. By reversing these motions (double arrows), first by rotating the inverted support arm  213  clockwise, then by dropping the slot  215  onto pin  216  to engage the cam follower wheel, the harmonica can be returned to the locked “playing” position. Thus this mechanism serves as a second variant of a memory lock feature. 
         [0075]      FIG. 12  is a view of an embodiment  300  of the invention configured for two harmonicas  1   a ,  1   b , where the harmonicas can be quickly exchanged. Both harmonicas are magnetically secured to the frame. A second magnet  310  is secured to the shoulder yoke by fasteners  311 . The second magnet may be secured to the right or the left arm of the shoulder yoke, or as shown here, magnets may be attached to both arms. Alternatively, a single harmonica may be held on one of the magnets, and an alternate instrument such as a microphone or whistle may be disposed on the other magnet, so that the harmonica and the alternate instrument conveniently may be swapped into the magnetic cradle at will. 
         [0076]      FIG. 13  is a perspective view of yet another embodiment, harmonica holder  400  of the invention, the embodiment having a wire frame with memory locking hinge and adjustable detents. Shown are shoulder yoke  401  and harmonica support frame  402 . Also shown is harmonica cradle  403 , which is covered in part by harmonica  1 . Shoulder yoke  401  and support frame  402  are joined at pivot assemblies  404 , which comprise an adjustable memory locking hinge with detent screws  405 . Support frame  402  is a wire-frame and is bent at the pivot to form a slot  406  that wraps around a slideable hub member (secured in place by rivet  408 ), as will be described in more detail below. The shoulder yoke is secured to the pivot member  404  by two rivets,  409  and  410 . For ease in manufacture, the two wire frames are identical component parts. 
         [0077]      FIG. 14  is a perspective front view of harmonica holder  400 . Shoulder yoke  401  is shown generally in the plane of the page; support frame  402  appears to extend toward the viewer out of the page. The wire frames pivot with respect to each other on a hub assembly indicated by the position of rivet  408 . 
         [0078]      FIG. 15  is a rear view of harmonica holder  400  showing the overall structure and appearance.  FIG. 16  is a side view of harmonica holder  400  showing the overall structure and appearance. The harmonica is mounted in the magnetic cradle so that an anterioinferior aspect of the harmonica coverplate is braced against an anteriosuperior raised lip  403   a  of the cradle  403 . A neck cushion  414  is illustrated, as would be used for comfort. The neck cushion could be a sculptured foam piece or tubular as indicated conceptually, and could be wrapped in a leather finish, for example. 
         [0079]    Magnetic cradle  403  is shown to be a bent plate in this embodiment and is secured to the support frame  402  with the aid of a lock nut  412 . Loosening the lock nut (or nuts) enables the cradle to be tilted relative to the mouth so that the musician can optimize the position of the mouthpiece when the harmonica is pivoted up into the play position. Also shown in this view is a bar magnet  413  positioned within the cradle against a backside lip  403   b.  Memory locking hinge  404  is shown in side view at a 90 degree pivot angle and again in  FIG. 17  at at 180 degree pivot angle. In  FIG. 17 , the hinge assembly is shown in more detail; in this view the harmonica holder is laid flat so that shoulder yoke arm  401  and harmonica support arm  402  are in parallel. 
         [0080]      FIG. 18  is an exploded view of a hinge assembly with memory locking hinge. The hinge assembly comprises two hingeplates ( 420 ,  421 ) and three rivets ( 408 ,  409 ,  410 ). Rivet  410  includes standoff  410   a  between the plates and stabilizes the hinge assembly. Hingeplate  420  is affixed to the shoulder yoke  401  by rivets  408  and  409 ; hingeplate  421  is affixed to the second wireframe  402  on a pivot hub  407 , which is mounted in slot  406  and held in place by rivet  408 . Detent screw  405  arrests the angular position of the support frame  402  and is preset by the musician to “remember” the preferred angle between the two wire frames, resisting clockwise motion of the harmonica cradle around hub  407 . The detent screw engages support frame  402  only when in the playing position, and when disengaged, the two wireframes are free to pivot. 
         [0081]      FIG. 19  depicts the memory locking action of the hinge assembly depicted in  FIG. 18 . In  FIG. 19A , the harmonica support frame  402  is free to rotate and hub rivet  408  has been positioned in slot  406  so that detent  405  does not engage. In  FIG. 19B , the hub rivet has been repositioned in slot  406  so that detent  405  engages the harmonica support member  402 . Thus  FIG. 19B  represents the memory lock configuration of the detent mechanism corresponding to the harmonica “playing position” and  FIG. 19A  demonstrates how the musician disengages the detent (before rotating the harmonica away from his mouth and face to the “at rest” position). 
         [0082]    All of the U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and related filings are incorporated herein by reference in their entirety. 
         [0083]    From the above disclosure, a skilled artisan will be able to practice the invention as described and shown, and to construct new embodiments and variants thereof. While there is provided herein a full and complete disclosure of the preferred embodiments, the invention is not limited to the exact construction, dimensional relationships, and operation shown and described. Various modifications, alternative constructions, changes and equivalents will readily occur to those skilled in the art and may be employed, as suitable, without departing from the true spirit and scope of the invention. Such changes can involve alternative materials, components, structural arrangements, sizes, shapes, forms, functions, auxiliary operational features or the like. 
         [0084]    Therefore, the above description and illustrations should not be construed as limiting the scope of the invention, which is defined by the appended claims. In general, in the following claims, the terms used in the written description should not be construed to limit the claims to specific embodiments described herein for illustration, but should be construed to include all possible embodiments, both specific and generic, along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.