Abstract:
A tremolo device with a movable bridge, an adjustment device, and a support frame is implemented on an acoustic guitar, with features that can also be employed on an electric guitar or other stringed instruments. The movable bridge holds strings of the musical instrument in tension. The adjustment device, such as a tremolo bar, moves the bridge to change the tension of the strings. The support frame engages the bridge at a first area and engages the musical instrument at a larger second area. When the tremolo device is used, the support frame receives a force over the first area and transmits a corresponding force to the musical instrument over the larger second area, reducing the pressure that would be experienced by the musical instrument. The support frame also transmits string vibration received through the bridge to the instrument body to produce proper acoustic tones.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present invention is a divisional application of U.S. patent application Ser. No. 13/680,039 of Predice D. HENDRICKS, entitled “HAND ACTUATED TREMOLO SYSTEM FOR GUITARS,” filed on Nov. 17, 2012, now allowed, which is a continuation application of U.S. patent application Ser. No. 12/950,547 of Predice D. HENDRICKS, entitled “HAND ACTUATED TREMOLO SYSTEM FOR GUITARS,” filed on Nov. 19, 2010, now U.S. Pat. No. 8,314,317, which is a divisional application of U.S. patent application Ser. No. 11/671,527 of Predice D. HENDRICKS, entitled “HAND ACTUATED TREMOLO SYSTEM FOR GUITARS,” filed on Feb. 6, 2007, now U.S. Patent No. 7,838,751, which claims benefit of priority to U.S. Provisional Patent Application Ser. No. 60/765,174 of Predice D. HENDRICKS, entitled “HAND ACTUATED TREMOLO SYSTEM FOR GUITARS,” filed on Feb. 6, 2006, the entire disclosures of all of which are hereby incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to musical instruments, and more particularly to hand actuated tremolo systems for use with acoustic guitars, with features that can also be used with electric guitars. 
     2. Discussion of the Background 
     Tremolo units are devices used to alter the pitch of a stringed musical instrument, such as a guitar, by changing the tension of the strings. Most embodiments of tremolo devices generally increase or decrease the tension of the strings when a lever, also known as a tremolo bar, moves a bridge that holds the strings in tension. In general, tremolo units have been exclusively designed for electric and semi-hollow body guitars. Though a useful and expressive tool for the electric guitarist, prior art tremolo devices designed for use with electric guitars are generally not compatible with acoustic guitars. 
     One type of tremolo has its roots in the Bigsby style of the 50&#39;s and 60&#39;s. The unit is fastened to the face of the guitar, and a large arm mounted on a tensioning spring governs an axle with six holes through which the strings pass. As the arm is depressed and the axle is turned, the tension and pitch of the strings is lowered. Variations on this format have recently been developed—some with axles that turn, others with tailpieces that slant forward. Some guitarists, however, find this style of tremolo too stiff for their liking. 
     The most common form for the tremolo is that found in the Stratocaster style of electric guitar. A large metal block through which the strings pass and terminate has a lever on top and springs on bottom. Six individual height (intonation) adjustment saddles are poised on top. The springs provide offset tension to counteract the pull of the strings. The steel bar sets into the block, and by rocking the bar, one can change the tension and the corresponding pitch of the strings. 
     Prior art tremolo devices, such as those described previously, however, are designed for electric guitars and are generally not compatible with acoustic guitars. Standard construction of prior art tremolo devices generally involves a bridge plate of a metal material that differs greatly from the porous, wooden material necessary to produce acceptable acoustic guitar tone. As can be appreciated, the sound produced by a standard acoustic guitar is significantly influenced by the manner in which the strings make contact with the fixed bridge of the guitar, as well as by the materials from which the fixed bridge is made. Prior art tremolo systems are not capable of transferring the vibration of the acoustic guitar strings through the bridge plate in a manner consistent with the production of acceptable guitar tone. Thus, the prior art metal device used with acoustic guitars would alter the sound of an acoustic guitar in an undesirable manner. 
     Moreover, the prior art method for attaching tremolo devices to an electric guitar makes them inappropriate for acoustic guitars. Threaded screws at least ½ inch in length go into the top surface of a solid body guitar as anchors for the standard tremolo device base plate. The string saddles are held against the top surface of the metal bridge plate by string tension and by a screw through each saddle. The screws, which are perpendicular to the top of the guitar body, must resist the full tension of the strings as well as remain upright against the rocking motion of the tremolo bridge when the device is in use. In a solid body guitar, enough wood surrounds the screws to allow mounting and use of the tremolo device without damage to the body of the instrument. Attaching a tremolo device to an acoustic guitar in the manner disclosed in the prior art with respect to electric guitar would place excessive stress on the top sound board. As referenced in Machinery&#39;s Handbook, 21 st  Edition, under “Permissible Working Stresses for Structural Timbers (U.S. Government Tests),” spruce (the type of material widely used for acoustic guitars) has the ability to withstand compression of 250 PSI perpendicular to the grain of the timber. With the thickness required for acoustic guitars, ⅛ inch or less, spruce, with this compression rating, is unable to support the screws necessary for mounting a tremolo device of an electric guitar without severe damage to the top sound board of an acoustic guitar. Further, the spruce top cannot resist the combined stress of 400 lbs. of tension placed against the mounting screws by the strings. It is unable to support the screws necessary for mounting such a tremolo device without severe damage to the top sound board of an acoustic guitar. 
     Another problem with tremolo devices, such as the Stratocaster style tremolo device, is an inability to return to the same tension and remain in tune after the tremolo device has been used. There are many factors in how a guitar returns to tune after use of a tremolo device. For instance, the strings must not grab in the nut slots or on the bridge saddles, or the breaking angle of the string over the nut must be correct. Guitarists may work around this retuning problem by using the tremolo lightly, using it only for the last song of a set, or adjusting the balance of the strings and the springs. Meanwhile, some manufacturers employ features such as rollers for saddles and nuts to minimize the chances that the strings will catch. In the last few years, a couple of locking mechanisms have been introduced on the tremolo. They all feature locking bridge saddles and locking nuts. However, such techniques require patient initial tuning to keep a guitar in tune during a lot of abuse. 
     SUMMARY OF THE INVENTION 
     Therefore, there is a need for a tremolo system practicable for use with acoustic guitars, which also solves the noted problems with tremolo systems for electric guitars. The above and other problems are addressed by the exemplary embodiments of the present invention, which provide an improved tremolo system practicable for use with acoustic guitars and which includes features that can also be used with electric guitars. The tremolo system of the exemplary embodiments can be used with an acoustic guitar and allows the player to raise or lower the pitch of notes and full chords creating a vibrato effect of equal pressure on all strings. This technique expands the tonal horizons of the acoustic guitar and the creativity of the guitarist. Advantageously, the exemplary embodiments eliminate undue stress on the guitar&#39;s hollow body, thus, maintaining its structural integrity and providing true tonal and resonance qualities. In addition, the exemplary embodiments preserve the appearance of the acoustic guitar, which can be appreciated by traditional players. Furthermore, various features of the exemplary embodiments can be used with electric guitars. 
     Accordingly, in an exemplary embodiment of the present invention, there is provided a tremolo device with a movable bridge, an adjustment device, and a support frame. The movable bridge is positioned on the musical instrument, such as an acoustic guitar, and adapted to hold strings of the musical instrument in tension. The adjustment device, such as a tremolo bar, is adapted to engage the bridge and to move the bridge to change the tension of the strings. The support frame is adapted to engage the bridge at a first area and to engage the musical instrument at a second area. When the tremolo device is used, the support frame receives a force, from movement of bridge, over the first area and transmits a corresponding force to the musical instrument over the second area. Because the second area is greater than the first area, the pressure received by the musical instrument is less than the pressure received from the bridge, reducing the stress that would be experienced by the body of the musical instrument. Moreover, the contact between the support frame and the musical instrument through the second area provides a mechanism by which string vibration received through the bridge can be transferred to the instrument body. The musical instrument may have an internal cavity, and the support frame may be positioned within the cavity. The second area on the support frame may engage one or more interior walls of the cavity. The movable bridge may be positioned over an opening in body of the musical instrument. The movable bridge may move to change the tension of the strings by pivoting at a side of the body opening with the opposite edge of the movable bridge moving in and out of said internal cavity. Moreover, the movable bridge may pivot at pivot posts that also engage the support frame, so that the support frame can resist the force at the pivot post and reduce the stresses on the body of the musical instrument. 
     Another embodiment of the present invention is a tremolo device with a movable bridge, an adjustment device, and a stabilizer unit. The movable bridge is adapted to hold the strings of a musical instrument, such as an acoustic guitar, in tension. The adjustment device, such as a tremolo bar, is adapted to engage the bridge and to move the bridge to change the tension of the strings. The stabilizer unit is also adapted to engage the bridge and to restrict movement of the bridge caused by the adjustment device. The stabilizer unit may fix the movable bridge in one position to prevent any change in the string tension. The stabilizer may be used to return the bridge to a preset fixed position, particularly corresponding to a desired tuning. Moreover, the stabilizer unit may allow limited movement of the adjustment device, for example, in a single direction. The forces exerted by the stabilizer unit may be received by a support frame. 
     Yet another embodiment of the present invention employs a movable bridge, an adjustment device, and a housing. The movable bridge is adapted to hold strings of a musical instrument, such as an acoustic guitar, in tension. The adjustment device, such as a tremolo bar, is adapted to engage the movable bridge with one end and to move the bridge to change the tension of the strings. The housing is adapted to form a socket in the bridge and to secure the second end of the adjustment device with a lock. The second end of the adjustment device is positioned longitudinally in the housing and the lock is positioned transversely in the housing to engage the second end. The lock may include a contact piece held against the adjustment device with a screw and spring to keep the adjustment device fixed in the socket. Moreover, the movable bridge may have oppositely facing top and bottom surfaces and may receive the housing in an opening, where an outer lip extending from the housing abuts an area on the top surface around the opening, and where a washer engages the housing and abuts an area on the bottom surface around the housing opening. 
     A further embodiment of the present invention employs a movable bridge to hold strings of a musical instrument in tension, where the movable bridge has a string holding portion shaped to have a slot to receive each of the strings in tension. The strings are fixed at a first end to a distal part of the musical instrument. The strings have a middle portion with a first width and a second end with a second width, where the first width is smaller than the slot width and the second width is larger than the slot width. The strings are positioned in the slots at the middle portions and the second ends engage the bottom surface of the string holding portion. 
     Still other aspects, features, and advantages of the present invention are readily apparent from the following detailed description, by illustrating a number of exemplary embodiments and implementations, including the best mode contemplated for carrying out the present invention. The present invention is also capable of other and different embodiments, and its several details can be modified in various respects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and descriptions are to be regarded as illustrative in nature, and not as restrictive. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which: 
         FIG. 1A  illustrates a perspective top view of an acoustic guitar showing the location of where the preferred embodiment of the present invention is affixed; 
         FIG. 1B  illustrates a view of the guitar flipped upside down with the back off to show how the preferred embodiment of the present invention butts up against the sound braces inside the guitar; 
         FIG. 1C  illustrates a three-dimensional diagram showing the front, sides, and top view of the preferred embodiment of the present invention support frame assembly; 
         FIG. 2  illustrates a diagram showing the details of how the stabilizer is built, and how it attaches to the rear of the preferred embodiment of the present invention frame assembly; 
         FIG. 3A  illustrates a top view of the stabilizer showing the radius of the stabilizer arm, which way it turns, and the different positions it can be set in; 
         FIG. 3B  illustrates a bridge showing the optional height adjustment knobs that can be used instead of the screws; 
         FIG. 3C  illustrates a knob configuration similar to that used in the stabilizer knob arms setup; 
         FIG. 3D  illustrates a top view of what the knob of  FIG. 3C , showing the head of the screw going down through the threaded cylinder and the notch on the knob that aligns with the adhesive key notation ring that is attached to the guitars body; 
         FIG. 3E  illustrates another height adjustment knob with a custom designed screw with a knob on top; 
         FIG. 3F  illustrates a top view of the knob of  FIG. 3E , showing the notch on the knob that aligns with the adhesive key notation ring that is attached to the guitars body; 
         FIG. 4A  illustrates a side view of the stabilizer and arm showing how the screw fits through and how the shaft (center cylinder) piece is recessed to except the knob on top and arm on the bottom; 
         FIG. 4B  illustrates the stabilizer knob showing the male cross end piece that recesses into the shaft; 
         FIG. 4C  illustrates the stabilizers shaft showing where the screw goes down through the middle and showing the recessed ends to where the stabilizers knob and arm fit in; 
         FIG. 4D  illustrates a the stabilizer arm showing the male cross end piece that recesses into the shaft; 
         FIG. 4E  illustrates a top view picture of the shaft showing the screw hole going down through the middle and the crossed recess area; 
         FIG. 4F  illustrates a top view of the stabilizers knob and arm and the shaft showing where the screw fits in; 
         FIG. 4G  illustrates a bottom view of the stabilizers knob and arm showing how the screw is secured; 
         FIG. 5  illustrates a front view of the central cross member of the frame assembly, showing the metal bracket attached to the face, and showing where the pivot posts screw into the housing unit, which is recessed into the central cross member; 
         FIG. 6  illustrates a rear view of the central cross member of the frame assembly, showing the recessed angle cut, which allows movement of the block when the tremolo bar is being used; 
         FIG. 7  illustrates a top view of the wooden bridge plate, showing the screws that hold the bridge in place, the pins that hold the strings in place, the bridge saddle, and the attached pieces on the side to give the appearance of a full bridge; 
         FIG. 8  illustrates a top view of the metal bridge plate showing the customized string slots that holds the strings in place, the housing for the tremolo bar, and the screws that hold the bridge in place; 
         FIG. 9A  illustrates a rear view of the metal bridge plate, showing how it is attached to the block and spring assembly, and showing the “C” shaped bend that accepts the arm of the stabilizer creating a fixed bridge setting when desired; 
         FIG. 9B  illustrates the tremolo arms housing unit; and 
         FIG. 10  illustrates a diagram showing the customized claw, showing the threaded holes that receive the Allen wrench screws that go through the face of the frame assembly and into the claw to secure them together. 
         FIGS. 11-27  illustrate further views of an exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The exemplary embodiments include the recognition that guitar players strive to create more expressive chord passages, licks, and runs, and develop more creative and advanced playing techniques. Accordingly, the present invention provides a tremolo device that is compatible with at least an acoustic guitar. 
     In particular, embodiments of the present invention provide a support frame assembly that permits a tremolo device to be mounted on an acoustic guitar. An exemplary embodiment of the present invention includes a bridge, a tremolo bar, and a support frame with a generally rectangular shape. As shown in  FIG. 1A , the support frame assembly  100  is installed inside the hollow cavity of an acoustic guitar body, just underneath the bridge area, providing a solid manner of affixing the system to the guitar, as well as providing structural support when the system is in use. 
     In accordance with this exemplary embodiment, a wooden top bridge plate  30  ( FIG. 7 ) is connected to a metal base plate  25  ( FIG. 8 ), forming a movable bridge  300  ( FIG. 1A ) over an opening in the body of the guitar. The movable bridge  300  is attached to the wooden support frame assembly  100  located inside the hollow cavity of the guitar. As shown in  FIG. 1C , a cross brace  6  on the support frame  100  has a pair of bridge pivot posts  10  to allow for secure attachment of the bridge  300  to the guitar. The support frame  100  is of sufficient strength to receive the forces and tension created by the strings when the tension of the strings is raised and lowered to provide the desired tremolo effect. The forces applied to the top by the tension of the strings is applied to the entire surface area where the support frame  100  engages the guitar body, thus spreading the force over an area of sufficient size to withstand the tension without causing the top to fail. The support frame  100  may be completely assembled prior to installing it in the guitar body. As shown in  FIG. 1B , the support frame  100  may be glued into place inside the sound box of the acoustic guitar, directly beneath the area where the tremolo is affixed. This operation can be performed before the back of the guitar is attached during the production of the instrument. 
     Moreover, the wooden frame support assembly  100  provides acceptable guitar tone, because it is in contact with two surfaces of the guitar, thus transmitting vibration from the bridge  300  to the guitar body. The top of the sound box of the acoustic guitar is constructed from spruce or other similar soft wood in a thickness of no greater than ⅛ inch. When properly supported by suitable braces located on the underside of the top, spruce or other similar soft wood is able to withstand upwards of 200 lbs of pull exerted by the strings at the site of a standard fixed bridge. In particular, as shown in  FIG. 1B , the support frame  100  abuts several braces glued to the underside of the top sound board, transferring string vibration from the tremolo bridge  300  through the support frame  100  and throughout the guitar body to the top and bottom sound boards. 
     Embodiments of the present invention also provide a stabilizer unit  200  ( FIG. 1C ) that offers the player at least three different bridge tension settings, as well as quick and easy alternate tuning settings. The stabilizer unit  200  is mounted to the support frame  100 . The stabilizer  200  can be designed to offer the player three different bridge tension settings as illustrated in  FIG. 3A : a fixed bridge A (a bridge that does not move); a standard bridge B (one that only moves down); and a floating bridge C (one that allows movement down and up). 
     To correct the problem of out-of-tune strings when a string breaks, the stabilizer arm  18  can be positioned in the standard position B, as shown in  FIG. 3A , allowing the bridge  300  to rest on the stabilizer arm  18  which is pre-positioned to standard tuning. When the guitar is properly tuned and stabilizer  200  is preset, the guitarist can quickly and easily compensate for a broken string during a song by pressing lightly on the tremolo bar  400  to release the tension on the strings and then swinging the arm  18  of the stabilizer  200  around to reset the bridge  300 . A broken string causes the tension of the remaining strings to change because the strings are attached to bridge  300  which is held in opposing tension by the springs  37  ( FIG. 9A ) of the tremolo device described hereinafter. The player can go right back into playing and finish the song without missing but a second or two of playing. Advantageously, this eliminates the need of changing guitars during a song, retuning, or having to stop the song, which can be particularly useful in live performances. 
     In addition, it has been discovered that when the tremolo bar  400  is not in stable engagement with the bridge  300 , the tremolo bar  400  may swing out of place or wobble when used. Some devices screw one end of the tremolo bar into a threaded socket, but this method may not provide a tight fit if the tremolo bar is not sufficiently rotated into the socket or if the bar starts to back out. Other prior art devices employ plastic clips which are supposed to create a tight fit, but such clips are prone to wear with the passage of time, causing a loosening of the fit. Thus, to solve the problems of the prior art, embodiments of the present invention provide a housing  500  ( FIGS. 9A-9B ) to secure the tremolo bar  400  to the bridge  300  and to prevent the tremolo bar  400  from being unstably fixed to the bridge  300 . As shown in  FIG. 9B , the housing  500  provides a socket  29  in the bridge  300  into which the tremolo bar  400  is inserted. This embodiment provides a spring loaded piece F ( FIG. 9B ) creating a constant tension on the tremolo bar  400  to create stable engagement between the tremolo bar  400  and the bridge  300 . 
     Furthermore, embodiments of the present invention prevent the guitar from becoming out of tune by employing string slots  600  to lock the strings and to prevent the strings from slipping. As illustrated in  FIG. 8 , proper tuning is retained after the tremolo device is used due to the manner in which the balls of the strings (devices capping the end of the strings) are anchored. The bridge  300  has string holes  27  which are perpendicular to the bridge surface. When the strings are positioned “downwardly” into the string holes  27 , each string slides into a slot  600  extending radially from the outer edge of the string hole  27 . The ball of each string is positioned “below” the slot. Because the width of the slot is less than the width of the ball, the ball cannot move “upward” into the slot. Thus, when there is tension pulling “upward” on the strings, the ball contacts the edges of the “lower” surface of the slots, resisting the “upward” pull. A pin is placed in the string holes to wedge the strings in the holes, but the contact between the balls and the edges of the slots prevents the strings from slipping and changing the tension and tuning. Proper tuning may be further retained by using LSR Roller Nut and Sperzel Locking Tuners. 
     Referring now to  FIGS. 1A-10 , there is illustrated an exemplary tremolo system, including an internal support frame assembly  100  ( FIG. 1A ) that can be produced from wood and features a rectangular design. In other embodiments, structures other than rectangular structures and materials other than wood can be employed, as will be appreciated by those skilled in the art. For example, any suitable composite, plastic, or like materials can be employed, and so that the natural acoustic resonance qualities of the acoustic guitar are preserved. 
     As shown in  FIG. 1C , the top parallel supports  1  are joined to vertical supports  3  at their ends. At the bottom of the rear vertical supports  3 , each side is joined together with glue on top of the bottom parallel supports  2  at Dowel rod area  7 A. The horizontal support member  5  is glued to each side of the rear bottom parallel supports  2 . At the top of each side both the top parallel supports  1  and rear vertical supports  3  are drilled through and two screws and bolts  13  are placed through each side to hold the stabilizer bracket  12  in place. The top parallel supports  1  are notched to recess the central cross member  6  in the middle, and are glued together at Dowel rod area  7 C. The bottom of the central cross member  6  sets on top of the bottom parallel supports  2  and is glued together at Dowel rod area  7 B. The front U-brace  4  can be one complete piece notched on top to allow the top parallel supports  1  to rest and be secured at Dowel rod area  7 D. The bottom parallel supports  2  butt and are secured at the backside of the front U-brace at Dowel rod area  7 E. This area keeps the tremolo claw  40  ( FIG. 10 ) and spring assembly  37  ( FIG. 9A ) in tension. A thin metal strip  8 A ( FIG. 1C ) is attached by two tiny screws  9 A onto the face of the front U-brace  4  for needed additional support. Another thin metal strip  8 B ( FIG. 1C ) is attached to the central cross member  6  by two tiny screws  9 B for additional support in this area as well. Two Allen wrench screws  11  are accessible through the guitars sound hole for adjustment of the spring assembly&#39;s tension, which is attached to the claw  40  ( FIG. 10 ). The claw  40  has the threaded screw holes  42 , into which the Allen wrench are screws recessed, and the teeth  41 , which attach to the springs  37  ( FIG. 9A ) of the claw  40 . Prior to installing the springs  37 , the preferred embodiment of the present invention utilizes a rubber hose sleeve around the springs  37 . However, the material used is not limited to the use of rubber but, for example, can use plastic or any other suitable material instead. Advantageously, this buffers the sound of the springs allowing a smoother sound when the tremolo is being used. 
     The central cross member  6  being one complete piece in the shape of an “n”, has a notch  6 B ( FIG. 6 ) to receive the top parallel supports  1  that rest on top of the central cross member  6 . They are connected and secured at Dowel rod area  7 C ( FIG. 1C ). Two holes  10  ( FIG. 1C ) located on the top of the central cross member  6  house the pivot posts  24  ( FIGS. 5-6 ) that align with the curved half-moon cuts at the bridge area  28  ( FIGS. 7-9A ) on the guitar surface. This allows the wooden bridge plate  30  ( FIG. 7 ) and the metal bridge plate  25  ( FIGS. 8-9A ) to engage the support frame  100  ( FIG. 1C ) located within the guitar body. The front view of the central cross member  6  ( FIG. 5 ) shows the housing and pivots  24  that are inserted through the guitar body and into the central cross member  6  ( FIG. 1C ).  FIG. 6  is the rear view of the central cross member showing the 22½ degree angle cut  6 A that gives the clearance to the block so that when the tremolo bar  400  is pulled back to raise the pitch, it gives the room necessary to allow the block to move freely and give the player a floating bridge when desired. Once the exemplary support frame assembly  100  is assembled, the Dowel rod areas ( 7 A- 7 E) are drilled and small Dowel rods, milled from hardwoods using conventional mill working techniques, are glued firmly into the mating holes for additional strength so the preferred embodiment of the present invention is able to withstand the stresses exerted upon it. The embodiment described herein uses glue, but the present invention is not limited to the use of adhesives. Mechanically interlocking parts or fastening devices can be used, for example. The exemplary tremolo system is not limited to the use of dowel rods, as other means, such as screws, can be used to secure the support frame assembly  100  together. 
     The stabilizing unit shown in  FIG. 2 , can include a metal bracket  12  bent at 90 degrees on each end to be attached to both the top supports  1  ( FIG. 1C ) and rear supports  3  and secured with two screws and bolts  13  on each end. Two height adjustment screws  14  ( FIG. 2 ) are fed down through the bracket  12  and springs  15  and attached to the bottom plate  16 . This allows the height of the stabilizer adjustment arm  18  ( FIG. 3A ,  4 A) to be set by threading the screws  14  into the stabilizer adjustment plate  16  ( FIG. 2 ), which also houses the stabilizer arm  18  and knob  17 . A screw  19  ( FIG. 2 ) is placed down through the stabilizer knob  17  with a male end on it ( FIG. 4B ) that fits into the top recessed area  23  ( FIG. 4C ) of the shaft ( FIG. 4C ). The shaft  21  ( FIG. 4C ) is recessed on both ends in the shape of a cross  23  to interlock so when you turn the knob ( FIG. 4B ), it prevents slippage or unnecessary turning. A hole  22  ( FIG. 4C ) extends down through the stabilizer bracket  12  ( FIG. 2 ), to the adjustment plate  16 . The screw  19  ( FIG. 2 ) and is secured with a bolt  20  on its end. It is preferred that a lock washer to be used for security. 
     These two height adjustment screws  14  ( FIG. 2 ) can offer a similar setup as the stabilizer knob  17  ( FIG. 2 ). Option # 1  ( FIG. 3C ) has a center cylinder  21 A that has threads on the outside. A screw  19 A fits down through the knob  17 A and cylinder  21 A and is secured at the bottom with a lock washer  22 A and nut  23 A. Option # 2  ( FIG. 3E ) has a custom knob screw made  17 B to fit this design. Either option used on the adjustment knobs can have a line  16 A that shows which key corresponds to the tuning at  16 A ( FIGS. 3D and 3F ). Attached to the guitar body is an adhesive plastic key notation ring  15 A. In production, when the guitar is tuned to E-440, that is when the height adjustment knobs are calibrated and marked to pitch and the plastic key notation ring is placed on the guitar body. Advantageously, these stabilizer knobs are particularly useful for players who desire alternate tunings and can be one of the added features found in top model guitars. 
     The bridge  300 , shown in  FIGS. 7-9 , can include two pieces. The top wooden bridge plate  30  ( FIG. 7 ) and the bottom metal bridge plate  25  ( FIG. 8 ). The bottom metal bridge plate  25  ( FIG. 8 ) is attached to the block  36  ( FIG. 9A ) by three screws  35  ( FIGS. 8 ,  9 A). These screws  35  go down through the metal bridge plate  25  ( FIG. 8 ) to secure to the block  36  ( FIG. 9A ) that houses the springs  37  ( FIG. 9A ) underneath. The circle end of the springs  37  attach to the teeth  41  ( FIG. 10 ) of the claw  40 . The claw  40  is attached to the inside front of the structure through holes  11  ( FIG. 1C ), and thread into the claw  42  ( FIG. 10 ) to adjust the tension of the springs  37  ( FIG. 9A ). Adjustments to the springs  37  in the tremolo device may be accomplished by using an Allen wrench through the sound hole. Advantageously, more accurate bridge tension settings are more easily accomplished, and adjustments do not have to be made through the back of the acoustic. A removable panel can be included on the back of the guitar for maintenance purposes. 
     Underneath the bottom metal bridge plate  25  ( FIG. 9A ) on the left side, the metal is bent at a 45-degree angle to create a slot  25 A so that the stabilizer arm  18  slides into when a fixed bridge setting is desired. The string holes  27  ( FIG. 8 ) allow attachment of the strings. The ball end of the strings fit into the respective slots  600  and are anchored underneath. The pins  33  ( FIG. 7 ) slide down through the bridge  300  to secure the strings in place. Once anchored, the strings set on top of the bridge saddle  31  ( FIG. 7 ) and are stretched up to attach to the tuning pegs. Advantageously, Sperzel locking tuners and a LSR roller nut can be used to ensure no slippage in the strings when the tremolo system is in use. 
     Slanted crescent moon cuts  28  ( FIG. 7-8 ) line up to the pivots  24  ( FIG. 5 ) on both the metal bridge plate  25  ( FIG. 8 ) and wooden bridge plate  30  ( FIG. 7 ), holding the bridge  300  in place. In  FIG. 7 , a thin line acoustic pickup  32  is shown. The Fishman Matrix acoustic pickup can be used for optimal performance. The wooden bridge plate  30  ( FIG. 7 ) aligns over the top of the metal bridge plate  25  ( FIG. 8 ) and is held down by four threaded screws  26  ( FIG. 7 ) that go through the metal bridge plate  25 . The side pieces  34  ( FIG. 7 ) of the bridge  300  are separate end pieces that are glued to the body to give the appearance of a traditional full bridge. 
     The tremolo bar  400  goes down through the wooden bridge plate  30  ( FIG. 7 ) and pops into the socket  29  ( FIG. 9A ) of the housing  400  in the metal bridge plate  25  ( FIG. 9A ). The socket  29  ( FIG. 9B ) is screwed into the metal bridge plate  25  by the following means. The top lip A of the tremolo-housing unit is put down through the metal bridge plate  25  creating stoppage for the socket. A lock washer  38  fits in under the top lip A and a threaded ring  39  fits in behind the lock washer that is tightened down on the housing units threads B to ensure the housing unit does not come loose. The threaded wall D of the recessed area of the housing unit is where the screw G is received. The little plastic piece F is recessed in the middle to allow the nut E to set flush. The high-tension spring C lies between the wall D and the contact piece F to give the desired tension to the tremolo bar  400  and hold the arm in place. When the tremolo bar  400  is inserted into the housing unit, the spring-loaded piece C creates the constant tension so the bar is in stable engagement with the bridge  300 . 
       FIGS. 11-27  provide additional views of the features of an exemplary embodiment of the present invention described herein. 
     Embodiments of the present invention can be completely assembled prior to installing in the body of the guitar. Each unit can be designed to fit any suitable style of acoustic guitar depending on the guitars thickness of the body. In the design of the exemplary embodiments, different dimensions can be used but the exemplary designs shown within the present disclosure can be most effective. 
     Although the exemplary support frame  100  is described in terms of being rectangular, structures other than rectangular structures can be employed, as will be appreciated by those skilled in the guitar art(s). Although the exemplary embodiments are described in terms of using wood, other materials can be employed, such as plastic, composite materials, or the like, as will be appreciated by those skilled in the guitar art(s). Moreover, the exemplary embodiments use glue and dowel rods but the present invention can use other suitable materials or devices for fastening parts of the invention. Any suitable materials or devices can be used as long as it preserves the natural acoustic resonance qualities of the acoustic guitar. 
     Advantageously, the various features of the exemplary tremolo system can be used with existing electric guitar tremolo systems. For example, the stabilizer unit  200  ( FIG. 2 ) can be screwed into the body of electric tremolo systems behind the bridge in its own routed area within the body. The stabilizer  200  can be installed prior to the top laminated piece being added. Another feature of this present invention that can apply to electric guitars is housing socket  29  ( FIGS. 9A-9B ), which creates a socket for the tremolo bar  400 . Advantageously, the housing unit  29  can be universally applied to other tremolo bar-housing units. 
     While the present inventions have been described in connection with a number of exemplary embodiments, and implementations, the present inventions are not so limited, but rather cover various modifications, and equivalent arrangements, which fall within the purview of the appended claims.