# US 5,705,760 A · Tuning systems for stringed instruments > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,705,760 A - Document ID: US5705760A - Status: Granted - Kind: A - Application number: 08/473,252 - Filed: 1995-06-07 - Granted: 1998-01-06 - Earliest claimed: 1995-06-07 - Inventors: Floyd D. Rose - Web page: https://patentgrep.com/patent/US5705760A ## CPC - G10D 1/08: Guitars - G10D 3/12: Anchoring devices for strings, e.g. tail pieces or hitchpins - G10D 3/14: Tuning devices, e.g. pegs, pins, friction discs or worm gears - G10D: STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR (organs, harmoniums or similar wind musical instruments with associated blowing apparatus G10B; pianos, harpsichords, spinets or similar stringed musical instruments with one or more keyboards G10C; automatic musical instruments G10F; electrophonic musical instruments in which tones are generated by electromechanical means G10H) ## Abstract A stringed instrument, such as a guitar, is provided. The stringed instrument comprises a body, a fretboard mounted on the body, a nut mounted on the body at one side of the fretboard, a bridge including a plurality of bridge critical contact surfaces mounted on the body at an opposing side of the fretboard and being arranged at a selectively adjustable distance with respect to the nut. The stringed instrument also comprises a plurality of strings each of which has a first end and a second end and a predetermined length extending between the first and second ends. The plurality of strings are arranged in contact with corresponding bridge critical contact surfaces and the nut and are arranged to extend across the contact surfaces. A convergence tuning mechanism is provided for simultaneously performing pitch and harmonic tuning of selected ones of the plurality of strings by increasing or decreasing the tension in the strings while simultaneously increasing or decreasing the distance between the corresponding bridge critical contact surfaces and the nut. The bridge critical contact surfaces may be arranged on top of rotatable pegs. Vertical adjustment of the bridge critical contact surfaces may optionally be performed. Another aspect of the present invention provides a device mounted in association with the bridge whereby simultaneous pitch and harmonic tuning of all of the strings associated with the instrument can be obtained at the same time. ## Claims ### Claim 1 A stringed instrument comprising: a body; a neck attached to said body; a fretboard arranged on said neck; a nut mounted on said neck at one end of said fretboard; a bridge including a plurality of bridge critical contact surfaces mounted on said body spaced from an opposing end of said fretboard, said plurality of bridge critical contact surfaces arranged at a selectively adjustable distance from said nut; a plurality of strings each having a first end and a second end and a predetermined length extending between said first and second ends, said plurality of strings arranged in contact with corresponding ones of said bridge critical contact surfaces and said nut and extending thereacross and being plaid under tension to permit obtaining of musical notes upon strumming or plucking thereof; and convergence tuning means including at least one tuning mechanism for simultaneously performing pitch and harmonic tuning of selected ones of said plurality of strings by selectively increasing or decreasing the tension in said selected ones of said plurality of strings while simultaneously increasing or decreasing said selectively adjustable distance between corresponding ones of said plurality of bridge critical contact surfaces and said nut, each said tuning mechanism including a single tuning device and being associated with one of said plurality of strings whereby selective adjustment of each said tuning device accomplishes convergence tuning of a single associated on of said plurality of strings. ### Claim 2 (depends on 1) The stringed instrument of claim 1, wherein said convergence tuning means is operatively associated with said bridge whereby selective adjustment of said convergence tuning means affects pivotable movement of said bridge critical contact surfaces toward or away from said nut. ### Claim 3 (depends on 1) The stringed instrument of claim 1, wherein said bridge comprises a plurality of saddles, said plurality of bridge critical contact surfaces being associated with corresponding ones of said plurality of saddles, said first end of said plurality of strings being arranged within corresponding ones of said plurality saddles. ### Claim 4 (depends on 3) The stringed instrument of claim 3, further comprising a string holder assembly mounted on said body adjacent said nut for retaining said second end of said plurality of strings. ### Claim 5 (depends on 4) The stringed instrument of claim 4, further comprising a first anchor affixed to said first end of each of said plurality of strings and a second anchor affixed to said second end of each of said plurality of strings, each of said plurality of strings arranged in assembled position with said first anchor secured within a corresponding one of said saddles and with said second anchor secured within said string holder assembly. ### Claim 6 (depends on 5) The stringed instrument of claim 5, wherein each of said plurality of saddles comprises a shoulder, said first anchors arranged in abutment with said shoulder of corresponding ones of said plurality of saddles. ### Claim 7 (depends on 6) The stringed instrument of claim 6, wherein said string holder assembly comprises a plurality of cavities, said second anchors being arranged in corresponding ones of said plurality of cavities, said string holder assembly further comprising a shoulder arranged at an end of each of said plurality of cavities, said second anchors being arranged in abutment with said shoulder of corresponding ones of said plurality of cavities. ### Claim 8 (depends on 3) The stringed instrument of claim 3, wherein said convergence tuning means comprises a plurality of adjustable knobs, each of said adjustable knobs being operatively associated with corresponding ones of said plurality of saddles whereby adjustment of selected ones of said plurality of adjustable knobs causes pivotable movement of corresponding ones of said plurality of saddles so that corresponding ones of said bridge critical contact surfaces are pivoted toward or away from said nut. ### Claim 9 (depends on 4) The stringed instrument of claim 4, wherein said first end of said plurality of strings is secured at a distance of no more than one half inch from corresponding ones of said bridge critical contact surfaces, and said second end of said plurality of strings are secured at a distance of no more than one half inch from said nut. ### Claim 10 (depends on 4) The stringed instrument of claim 4, wherein said first end of said plurality of strings is secured at a distance of 0.175 inch from corresponding ones of said bridge critical contact surfaces, and said second end of said plurality of strings is secured at a distance of 0.175 inch from said nut. ### Claim 11 (depends on 3) The stringed instrument of claim 3, wherein said bridge further comprises a base fixed to said body, said plurality of saddles being pivotally connected to said base. ### Claim 12 (depends on 11) The stringed instrument of claim 11, wherein said bridge further comprises a plurality of lever arms pivotally connected to said base, said convergence tuning means comprising a plurality of adjustable knobs, and said base including a plurality of threaded passageways, each of said adjustable knobs having a threaded shaft extending through corresponding ones of said plurality of threaded passageways, each of said saddles being connected to a corresponding one of said plurality of lever arms which are arranged for operative association with said plurality of adjustable knobs whereby threaded movement of said adjustable knobs along said threaded passageways causes pivoting of corresponding ones of said lever arms and said saddles and said bridge critical contact surfaces. ### Claim 13 (depends on 1) The stringed instrument of claim 1, wherein said convergence tuning means comprises a plurality of adjustable knobs wherein only a single adjustable knob is associated with each one of said plurality of strings, Whereby adjustment of one of said adjustable knobs can obtain said simultaneous pitch and harmonic tuning for a corresponding one of said plurality of strings. ### Claim 14 (depends on 1) The stringed instrument of claim 1, wherein said bridge comprises a tremolo for rapidly modifying the tension of said plurality of strings during playing of said stringed instrument so that a desired musical tone may be obtained. ### Claim 15 (depends on 3) The string instrument of claim 3, wherein said plurality of bridge critical contact surfaces are arranged at a desired height above said fretboard, said tuning means comprising vertical height adjustment means for adjusting the vertical position of said plurality of bridge critical contact surfaces with respect to said fretboard. ### Claim 16 (depends on 15) The stringed instrument of claim 15, wherein said bridge further comprises a base, said plurality of saddles being mounted for pivotal movement about a common axis with respect to said base, and a surface arranged below each of said plurality of saddles, said vertical height adjustment means comprising the combination of a threaded passageway extending through each of said saddles and a corresponding threaded screw having a top end and a bottom end arranged for threaded movement along said threaded passageway, each of said threaded screws extending through the corresponding threaded passageways so that the bottom end is in contact with said surface below said saddle whereby adjustment of said threaded screws cause corresponding ones of said plurality of saddles to pivot so that the corresponding bridge critical contact surface moves upwardly or downwardly with respect to said fretboard. ### Claim 17 (depends on 1) The stringed instrument of claim 1, wherein said bridge comprises a plurality of saddles for receiving said first end of corresponding ones of said plurality of strings, and a plurality of rotatable pegs having a top surface, said plurality of bridge critical contact surfaces comprising said top surface of corresponding ones of said plurality of said rotatable pegs. ### Claim 18 (depends on 17) The stringed instrument of claim 17, wherein said top surface of said plurality of rotatable pegs includes a groove for receiving corresponding ones of said plurality of strings when said plurality of strings are placed in contact with said plurality of bridge critical contact surfaces. ### Claim 19 (depends on 18) The stringed instrument of claim 18, wherein said top surface of said plurality of rotatable pegs include a raised section, said bridge critical contact surfaces being arranged only on said raised section. ### Claim 20 (depends on 19) The stringed instrument of claim 19, wherein said bridge critical contact surfaces can be moved upon rotation of corresponding said rotatable pegs between a first position at which said bridge critical contact surfaces are relatively close to said first end of corresponding ones of said plurality of strings and a second position at which they are further from said first end of corresponding ones of said plurality of strings. ### Claim 21 A stringed instrument comprising: a body; a neck attached to said body; a fretboard arranged on said neck, said fretboard having a first end and a second end; a nut mounted on said neck at one end of said fretboard; a bridge including a plurality of rotatable pegs rotatably mounted on said body spaced from an opposing end of said fretboard, said plurality of rotatable pegs comprising a top surface, each said top surface including a bridge critical contact surface and a groove extending across corresponding bridge critical contact surfaces; and a plurality of strings having a first end and a second positioned and extending across and in contact with said nut and said bridge critical contact surfaces, said bridge critical contact surfaces being movable between a first position at which they are relatively close to said first end of corresponding ones of said plurality of strings and a second position at which they are further from said first end of corresponding ones of said plurality of strings. ### Claim 22 (depends on 21) The stringed instrument of claim 21, wherein said top surface of said plurality of rotatable pegs includes a raised section, said bridge critical contact surfaces being arranged only on said raised section. ### Claim 23 A stringed instrument comprising: a body; a neck attached to said body; a fretboard having a first end and a second end arranged on said neck; a nut mounted on said neck at one end of said fretboard; a plurality of string holders mounted on said neck adjacent said nut; a plurality of saddles mounted on said body spaced from an opposing end of said fretboard and said plurality of string holders; a plurality of bridge critical contact surfaces associated with corresponding ones of said plurality of saddles; a plurality of strings each having a first end and a second end and a predetermined length extending between said first and second ends, said plurality of strings being placed under tension with said first end secured within corresponding ones of said plurality of saddles and said second end secured within corresponding ones of said plurality of string holders, each of said plurality of strings being arranged to contact said nut and corresponding ones of said plurality of bridge critical contact surfaces so that musical notes are obtained upon strumming or plucking of said strings; and a plurality of adjustable tuning knobs operatively associated with corresponding ones of said plurality of saddles for obtaining simultaneous pitch and harmonic tuning, the quantity of said string holders being selected to correspond with the quantity of said saddles and said strings and said adjustable tuning knobs so that a one-tone relationship exists between each of said string holders, said strings, said saddles and said adjustable tuning knobs. ### Claim 24 (depends on 23) The stringed instrument of claim 23, further comprising a first bullet affixed to said first end of each of said plurality of strings and a second bullet affixed to second end of each of said plurality of strings, each of said plurality of strings arranged in assembled position with said first bullet secured within a corresponding one of said saddles and with said second bullet secured within a corresponding one of said string holders. ### Claim 25 (depends on 24) The stringed instrument of claim 24, further comprising second bullet retention means for wherein said string holder assembly comprises a plurality of cavities, said second bullets being arranged in corresponding ones of said plurality of cavities, said string holder assembly further comprising a shoulder arrangement at an end of each of said plurality of cavities, said second bullets being arranged in abutment with said shoulder of corresponding ones of said plurality of cavities. ### Claim 26 (depends on 24) The stringed instrument of claim 24, wherein each of said plurality of adjustable tuning knobs is operatively associated with corresponding ones of said plurality of saddles whereby adjustment of selected ones of said plurality of adjustable tuning knobs causes pivotable movement of corresponding ones of said plurality of saddles so that corresponding ones of said bridge critical contact surfaces are pivoted toward or away from said nut. ### Claim 27 (depends on 23) The stringed instrument of claim 23, wherein said first end of said plurality of strings are secured at a distance of no more than one inch from corresponding ones of said bridge critical contact surfaces, and said second end of said plurality of strings are secured at a distance of no more than one inch from said nut. ### Claim 28 (depends on 23) The stringed instrument of claim 23, wherein said first end of said plurality of strings are secured at a distance of 0.175 inch from corresponding ones of said bridge critical contact surfaces, and said second end of said plurality of strings are secured at a distance of 0.175 inch from said nut. ### Claim 29 A bridge assembly for use with a stringed instrument, said stringed instrument having a body, a neck attached to said body, a fretboard arranged on said neck, a nut mounted on said neck at one end of said fretboard, a plurality of strings each having a first end and a second end and a predetermined length extending between said first and second ends, and a string holder assembly for retaining said second end of said plurality of strings, said plurality of strings being placed under tension to produce musical notes upon strumming or plucking thereof, said bridge assembly comprising: a base adapted to be mounted on said body spaced from an end of the fretboard opposing the nut; a plurality of saddles pivotally connected to said base adapted to retain the first end of corresponding ones of said plurality of strings; a plurality of bridge critical contact surfaces spaced from corresponding ones of said plurality of saddles and arranged at an adjustable distance with respect to said nut and a tuning mechanism adapted to simultaneously perform pitch and harmonic tuning of selected ones of the plurality of strings by selectively adjusting said distance between said nut and said bridge critical contact surfaces and simultaneously adjusting the tension in corresponding ones of said plurality of strings, said tuning mechanism including a plurality of tuning devices, each said tuning device being associated with one of said plurality of strings whereby selective adjustment of each said tuning device accomplishes convergence tuning of a single associated one of said plurality of strings. ### Claim 30 (depends on 29) The bridge assembly of claim 29, wherein said plurality of bridge critical contact surfaces are integral with corresponding ones of said plurality of saddles. ### Claim 31 (depends on 29) The bridge assembly of claim 29, wherein said tuning mechanism is operatively associated with said plurality of saddles whereby selected adjustment of said tuning mechanism causes pivotable movement of selected ones of said plurality of saddles and said plurality of bridge critical contact surfaces toward or away from said nut. ### Claim 32 (depends on 29) The bridge assembly of claim 29, wherein said tuning mechanism comprises a plurality of adjustable knobs, each of said adjustable knobs being operatively associated with corresponding ones of said plurality of saddles whereby adjustment of selected ones of said plurality of knobs causes pivotable movement of corresponding ones of said plurality of saddles so that corresponding ones of said bridge critical contact surfaces are pivoted toward or away from said nut. ### Claim 33 (depends on 29) The bridge assembly of claim 29, wherein said tuning mechanism comprises a plurality of adjustable knobs, each of said adjustable knobs having a threaded shaft extending through corresponding threaded passageways within said mounting base, each of said saddles being connected to a 1ever arm which is arranged for operative association with said plurality of adjustable knobs whereby threaded movement of said adjustable knobs along said threaded passageways causes pivoting of corresponding ones of said lever arms and said saddle and said bridge critical contact surfaces. ### Claim 34 (depends on 29) The bridge assembly of claim 29, wherein said first end of each of said plurality of strings is spaced from corresponding ones of said bridge critical contact surfaces by 0.175 inch and said second end of each of said plurality of strings is spaced from said nut by 0.175 inch. ### Claim 35 (depends on 29) The bridge assembly of claim 29, further comprising a tremolo for rapidly modifying the tension of said plurality of strings during playing of said stringed instrument so that a desired musical tone may be obtained. ### Claim 36 (depends on 29) The bridge assembly of claim 29, wherein each of said plurality of strings includes a first bullet affixed to said first end and a second bullet affixed to said second end, said predetermined length of said plurality of strings defined by the distance between said first and second bullets, each of said plurality of saddles includes a shoulder, said first bullets arranged in abutment with said shoulder of corresponding ones of said plurality of saddles. ### Claim 37 (depends on 29) The stringed instrument of claim 29, further comprising a plurality of saddles for receiving said first end of corresponding ones of said plurality of strings, and a plurality of rotatable pegs having a top surface, said plurality of bridge critical contact surfaces comprising said top surface of corresponding ones of said plurality of said rotatable pegs. ### Claim 38 (depends on 37) The stringed instrument of claim 37, wherein said top surface of said plurality of rotatable pegs includes a groove for receiving corresponding ones of said plurality of strings when said plurality of strings are placed in contact with said plurality of bridge critical contact surfaces. ### Claim 39 (depends on 38) The stringed instrument of claim 38, wherein said top surface of said plurality of rotatable pegs include a raised section, said bridge critical contact surfaces being arranged only on said raised section. ### Claim 40 (depends on 39) The stringed instrument of claim 39, wherein said plurality of bridge critical contact surfaces can be moved upon rotation of corresponding ones of said plurality of rotatable pegs between a first position at which said plurality of bridge critical contact surfaces are relatively close to said first end of corresponding 20 ones of said plurality of strings and a second position at which they are further from said first end of corresponding ones of said plurality of strings. ### Claim 41 (depends on 29) The string instrument of claim 29, wherein said plurality of bridge critical contact surfaces are arranged at a desired height above said fretboard, said tuning mechanism comprising vertical height adjustment means for adjusting the vertical position of said plurality of bridge critical contact surfaces with respect to said fretboard. ### Claim 42 (depends on 41) The string in instrument of claim 41, wherein said plurality of saddles are mounted for pivotable movement about a common axis with respect to said base, and a surface arranged below each of said plurality of saddles, said vertical height adjustment means comprising the combination of a threaded passageway extending through each of said saddles and a corresponding threaded screw having a top end and a bottom end arranged for threaded movement along said threaded passageway, each of said threaded screws extending through the corresponding threaded passageways so that the bottom end is in contact with said surface below said saddle whereby adjustment of said screws cause corresponding ones of said plurality of saddles to pivot so that the corresponding bridge critical contact surface moves upwardly or downwardly with respect to said fretboard. ### Claim 43 (depends on 1) The stringed instrument of claim 1, wherein said convergence tuning means comprises: means for obtaining said simultaneous pitch and harmonic tuning of all of said plurality of strings at the same time. ### Claim 44 (depends on 43) The stringed instrument of claim 43, wherein said stringed instrument is a guitar and said plurality of strings comprises six strings corresponding to the musical notes E, A, D, G, B and E receptively. ### Claim 45 (depends on 43) The stringed instrument of claim 43, wherein said convergence tuning means comprises means for pivoting said entire bridge between a playing position at which said plurality of strings are placed under tension and a loading position at which said entire bridge is tilted towards said nut and said tension in said plurality of strings is simultaneously reduced. ### Claim 46 (depends on 45) The stringed instrument of claim 45, further comprises means comprises means for selectively locking said bridge in said playing position, and means for selectively releasing said bridge from said playing position so that it can be pivoted towards said nut and placed in said loading position. ### Claim 47 (depends on 45) The stringed instrument of claim 45, further comprising means for selectively locking said bridge in said loading position and for releasing said bridge from said loading position so that it can be pivoted away from said nut and returned to said playing position. ### Claim 48 (depends on 47) The string instrument of claim 47, wherein said bridge comprises a tremolo. ### Claim 49 A stringed instrument comprising: a body; a neck attached to said body; a fretboard arranged on said neck; a nut mounted on said neck at one end of said fretboard; a bridge including a plurality of bridge critical contact surfaces mounted on said body spaced from an opposing end of said fretboard, said plurality of bridge critical contact surfaces arranged at a selectively adjustable distance from said nut; a plurality of strings each having a first end and a second end and a predetermined length extending between said first and second ends, said plurality of strings arranged in contact with corresponding ones of said bridge critical contact surfaces and said nut and extending thereacross and being placed under tension to permit obtaining of musical notes upon strumming or plucking thereof; and convergence tuning means for obtaining at least pitch and harmonic tuning of all of said plurality of strings at the same time. ### Claim 50 (depends on 49) The stringed instrument of claim 49, wherein said stringed instrument is a guitar and said plurality of strings comprises six strings corresponding to the musical notes E, A, D, G, B and E respectively. ### Claim 51 (depends on 49) The stringed instrument of claim 49, wherein said convergence tuning means comprises means for pivoting said entire bridge between a playing position at which said plurality of strings are placed under tension and a loading position at which said entire bridge is tilted towards said nut and said tension in said plurality of strings is simultaneously reduced. ### Claim 52 (depends on 51) The stringed instrument of claim 51, further comprises means comprises means for selectively locking said bridge in said playing position, and means for selectively releasing said bridge from said playing position so that it can be pivoted towards said nut and placed in said loading position. ### Claim 53 (depends on 51) The stringed instrument of claim 51, further comprising means for selectively locking said bridge in said loading position and for releasing said bridge from said loading position so that it can be pivoted away from said nut and returned to said playing position. ### Claim 54 (depends on 53) The string instrument of claim 53, wherein said bridge comprises a tremolo. ### Claim 55 A method of tuning a stringed instrument including a body, a neck attached to said body, a fretboard arranged on said neck, a nut mounted on said neck at one end of said fretboard, a bridge including a plurality of bridge critical contact surfaces mounted on said body spaced from an opposing end of said fretboard, string retainer means for retaining a plurality of strings at said nut and bridge so that the strings are in contact with said nut and bridge critical contact surfaces, and convergence tuning means arranged at said bridge or said nut, said method comprising the steps of: placing at least one of the strings within said string retainer means; and simultaneously tuning said at least one string to effect both the desired harmonic and pitch tuning thereof by operating said convergence tuning means. ### Claim 56 (depends on 55) The method of claim 55 wherein said string retainer means comprises a plurality of saddles at said bridge and corresponding string holders at said nut where each of said plurality of strings is retained within a single set of a corresponding saddle and string holder, said step of placing at least one of the strings within said string retainer means comprising arranging said at least one of the strings within its set of said corresponding saddle and string holder. ### Claim 57 (depends on 56) The method of claim 56 wherein said step of tuning comprises adjusting a single tuning mechanism to obtain said simultaneous pitch and harmonic tuning of the desired string or strings. ### Claim 58 (depends on 57) The method of claim 57 wherein said single tuning mechanism is arranged at said bridge and said step of adjusting said single tuning mechanism causes pivoting or sliding of a corresponding saddle.