CN214847689U - Bass bridge suitable for adjusting octave - Google Patents

Abstract

The utility model discloses a bass bridge suitable for adjusting octave, which comprises a bridge body, a bridge, headless hexagon socket head bolts, screws and wood screws; the utility model has the main characteristics that: the left upper end of the tailpiece is provided with 4-6 square holes at intervals along the front-back length direction; a square movable plate matched with the square hole is arranged in the square hole; the front cylindrical insert column and the rear cylindrical insert column are respectively inserted into the front small circular groove and the rear small circular groove in the middle of the front wall thickness and the rear wall thickness of the square hole forwards and backwards under the elastic force action of the front compression spring and the rear compression spring, and then the square movable plate can rotate in the square hole of the tailpiece; the inner diameter of the round through hole of the square movable plate is tightly matched with the outer diameter end of the bearing, and the inner diameter of the bearing is tightly matched with the outer diameter end of the screw head of the screw. The utility model discloses when adjusting the octave, need not to relax the string, no matter clockwise or anticlockwise twist change the screw, the regulation operation of shellfish octave can be accomplished in the swift enough ground to all.

Description

Bass bridge suitable for adjusting octave

Technical Field

The utility model belongs to the technical field of the musical instrument technique and specifically relates to a bass bridge suitable for adjust octave.

Background

Common bass bridges include bridge bodies, bridge keys, headless hexagon socket head bolts, screws, and wood screws.

The cross-section of the bridge body is L-shaped, the bridge body comprises a bottom plate and an integrally formed tailpiece, a 90-degree right angle is formed between the left width direction and the right width direction of the bottom plate and the upper width direction and the lower width direction of the tailpiece, 5-7 wood screw mounting holes are arranged on the left side of the top end of the bottom plate at intervals along the front length direction and the rear length direction, the bottom plate is screwed and fixed on a panel at the bottom of the bridge body through the wood screw mounting holes by wood screws, and 4-6 bridge codes are arranged on the upper right side of the bottom plate at intervals along the front length direction and the rear length direction.

The bridge is cylindrical, longitudinal threaded holes are formed in the top ends of the front end and the rear end of the bridge along the radial direction, headless hexagon socket head bolts used for adjusting the string height are arranged in the longitudinal threaded holes, an annular groove used for erecting strings is formed in the middle of the bridge along the front length direction and the rear length direction, and a transverse threaded hole matched and connected with the right end of the screw is formed in the left side, located between the annular groove and the longitudinal threaded hole in the front end, of the bridge along the radial direction.

In the prior art, the screw is a cross-shaped groove countersunk head screw and comprises a screw head and an integrally formed screw rod, the screw head is circular, the diameter of the screw head is larger than that of the screw rod, and a cross-shaped groove convenient for a cross-head screwdriver to twist and rotate is formed in the center of the left end face of the screw head.

The left lower end of the tailpiece is arranged with 4-6 string holes along the front and back length direction at intervals, and the string tail of the string passes through the string holes and then is erected and tightened in the annular groove of the bridge.

The left upper end of the tailpiece is arranged with 5-7 round through holes corresponding to the transverse threaded holes on the bridge at intervals along the front and back length directions, the tailpiece of the bridge is connected with the bridge through cross-shaped groove countersunk head screws, the inner diameters of the round through holes are smaller than the diameters of screw heads but are obviously larger than the diameters of the screw rods of the cross-shaped groove countersunk head screws, after the screw rods of the cross-shaped groove countersunk head screws penetrate through the round through holes rightwards and are matched and screwed with the transverse threaded holes on the bridge, and the right ends of the cross-shaped groove countersunk head screws can ascend or descend along with the bridge. The compression spring is sleeved on the outer diameter end of the screw rod between the tailpiece and the bridge.

This bass requires tuning of the chord height and octave before playing.

When the string height is adjusted, the internal hexagonal wrench is inserted into the internal hexagonal counter bore of the headless internal hexagonal bolt at the top end of the bridge and is screwed clockwise or anticlockwise, and the string height of the bass can be adjusted through the rising or falling of the bridge. By adjusting the string height, the hand feeling can be more comfortable.

Because the inner diameter of the round through hole on the tailpiece is smaller than the diameter of the screw head but larger than the diameter of the screw rod of the cross-shaped groove countersunk head screw, when the headless hexagon socket head cap screw at the top end of the bridge is screwed clockwise or anticlockwise, the right end of the cross-shaped groove countersunk head screw can also ascend or descend along with the bridge along with the ascending or descending of the bridge.

When the octave is adjusted, a cross screwdriver is adopted to clockwise or anticlockwise twist and turn a cross-shaped groove countersunk head screw connected between the bridge and the tailpiece, so that the bridge moves left and right on the bottom plate of the bridge, and the bass octave can be adjusted. The distance between the tailpiece of the bridge and the bridge is adjusted, octave tones can be adjusted, and pitches after twelve tones are more accurate.

When the cross-shaped groove countersunk head screw is twisted clockwise, the bridge moves leftwards, and the distance between the tailpiece and the bridge is shortened; when the cross-shaped groove countersunk head screw is turned anticlockwise, the bridge moves rightwards under the elastic force of the compression spring, and the distance between the tailpiece and the bridge is lengthened. The music is moved left and right on the bottom plate of the bridge through the music bridge, and then octave is adjusted, so that the pitch after twelve tones is more accurate.

However, in the prior art, both ways of adjusting the octave have drawbacks.

The first adjustment mode is as follows: the adjustment is performed in a standard pitch state. In the adjusting mode, when the cross-shaped groove countersunk head screw is screwed clockwise, the bridge moves leftwards, so that the bridge is easy to adjust and has no problem; however, when the cross-shaped groove countersunk head screw is screwed anticlockwise, the left end of the screw rod is in a loose state in the round through hole of the tailpiece, the bridge is pressed by the tight strings in a standard pitch state, the bridge can be pushed to move rightwards only under the action of the elastic force of the compression spring, and in actual operation, the compression spring is difficult to push the bridge to move rightwards. Therefore, the octave is adjusted under the standard pitch state, and the condition that the bridge is moved to the left by turning the countersunk head screw of the cross-shaped groove clockwise is almost only suitable.

The second adjustment mode is as follows: the strings are relaxed first and then adjusted. In the adjusting mode, when the cross-shaped groove countersunk head screw is clockwise screwed, the bridge moves leftwards, and the problem does not exist during adjustment; when the cross-shaped groove countersunk head screw is turned anticlockwise, although the left end of the screw rod is in a loose state in the round through hole of the tailpiece, the bridge is not pressed by the strings, and the compression spring can push the bridge to move rightwards under the elastic action of the compression spring. However, the string needs to be loosened in the adjusting mode, and the string needs to be tightened again after the adjustment is completed, so that the operation is very troublesome. And after relaxing the string, the string is in the relaxed state, can't test the regulation condition of octave, often need repeat above-mentioned operation many times to make the pitch after the twelve article gradually approach the accuracy.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel bass bridge, when adjusting the octave, the external diameter of screw rod is served and need not the cover and is established compression spring, also need not to relax the string, no matter clockwise or anticlockwise twist change the screw, all can easily make the musical instrument sign indicating number remove left or right, swiftly accomplish the regulation operation of bass octave.

The technical scheme of the utility model is that: a bass bridge suitable for adjusting octave is designed and manufactured and comprises a bridge body, a bridge code, headless hexagon socket head bolts, screws and wood screws.

The cross-section of the bridge body is L-shaped, the bridge body comprises a bottom plate and an integrally formed tailpiece, a 90-degree right angle is formed between the left width direction and the right width direction of the bottom plate and between the upper width direction and the lower width direction of the tailpiece, 5-7 wood screw mounting holes are arranged at intervals along the front length direction and the rear length direction at the left upper end of the bottom plate, the bottom plate is screwed and fixed on a panel at the bottom of the bridge body through the wood screw mounting holes by wood screws, and 4-6 bridge codes are arranged at intervals along the front length direction and the rear length direction at the upper right side of the bottom plate.

The bridge is cylindrical, longitudinal threaded holes are formed in the top ends of the front end and the rear end of the bridge along the radial direction, headless hexagon socket head bolts used for adjusting the string height are arranged in the longitudinal threaded holes, an annular groove used for erecting a string is formed in the middle circumference of the bridge along the front length direction and the rear length direction, and a transverse threaded hole matched and connected with the right end of the screw is formed in the left side, located between the annular groove and the longitudinal threaded hole in the front end, of the bridge along the radial direction.

The left lower end of the tailpiece is arranged with 4-6 string holes at intervals along the front and back length directions, and the string tail of the string passes through the string holes and then is erected and tightened in the annular groove of the bridge.

The utility model has the main characteristics that: the left upper end of the tailpiece is provided with 4-6 square holes at intervals along the front and rear length directions, the middle parts of the front wall thickness and the rear wall thickness of the square holes are respectively provided with a front small circular groove and a corresponding rear small circular groove, and the front small circular groove and the rear small circular groove are on the same axis.

The square hole in be equipped with the square fly leaf of adaptation, the cross-section of the top and the bottom of square fly leaf is established to the circular arc that the axis is the same, the square fly leaf is the same with the left and right sides thickness size of tailpiece, square fly leaf can be in the square hole internal rotation.

The middle parts of the front end face and the rear end face of the square movable plate are respectively provided with a front large circular groove and a symmetrical rear large circular groove, orifices of the front large circular groove and the rear large circular groove are respectively provided with a front annular boss and a rear annular boss, the front annular boss and the rear annular boss are respectively provided with a front check ring and a rear check ring which are matched, and the front check ring and the rear check ring are respectively welded and fixed on the front annular boss and the rear annular boss.

The front large circular groove and the rear large circular groove are respectively provided with a front compression spring and a rear compression spring which are matched with each other, the front surface of the front compression spring and the rear surface of the rear compression spring are respectively provided with a front circular baffle and a rear circular baffle which are matched with each other, the diameters of the front circular baffle and the rear circular baffle are smaller than the inner diameters of the front large circular groove and the rear large circular groove by 0.1-0.3mm, the front end surface and the rear end surface of the front compression spring are respectively tightly propped against the rear end surface of the front circular baffle and the groove bottom of the front large circular groove, the front end surface and the rear end surface of the rear compression spring are respectively tightly propped against the front end surface of the rear circular baffle and the groove bottom of the rear large circular groove, the front end of the front circular baffle and the rear end of the rear circular baffle are respectively provided with a front cylindrical insert column and a rear cylindrical insert column which are integrally formed, the diameters of the front cylindrical insert column and the rear cylindrical insert column are smaller than the diameters of the front circular baffle and the rear cylindrical insert column, and the front end of the rear cylindrical insert column respectively pass through the front retaining ring and the rear retaining ring, and after the movable plate is inserted into the front small circular groove and the rear small circular groove forwards and backwards under the elastic force action of the front compression spring and the rear compression spring respectively, the square movable plate can rotate around the axis of the front cylindrical insert column and the axis of the rear cylindrical insert column in the square hole of the tailpiece.

And a circular through hole corresponding to the transverse threaded hole is formed in the center of the front end of the square movable plate.

The internal diameter of circle through-hole and the external diameter end of bearing between tight fit, tight fit between the internal diameter of bearing and the external diameter end of the spiral shell head of screw, the right-hand member of the screw rod of screw is connected with the horizontal screw hole cooperation on the musical instrument sign indicating number, the spiral shell head is established to cylindrically, the diameter of spiral shell head is less than the diameter of screw rod, the center of the left end face of spiral shell head is equipped with the "ten" font slot of being convenient for the cross screwdriver to twist and turn.

Furthermore, the square movable plate, the front circular baffle, the rear circular baffle, the front cylindrical inserting column, the rear cylindrical inserting column, the front retainer ring and the rear retainer ring are all made of alloy.

The utility model has the advantages that: the utility model provides a not enough of prior art has been overcome, the utility model provides a novel bass bridge, when adjusting the octave, the external diameter of screw rod is served and need not the cover and is established compression spring, also need not to relax the string, no matter clockwise or anticlockwise twist change the screw, all can easily make the musical instrument sign indicating number move left or right, swiftly accomplish the regulation operation of bass octave.

Drawings

The specific structure of the present invention is given by the following embodiments and the accompanying drawings.

Fig. 1 is a schematic structural diagram of the specific structure of the present invention.

Fig. 2 is a sectional view a-a in fig. 1.

Fig. 3 is an enlarged view of a portion a of fig. 1.

In the figure, 1 is a tailpiece, 2 is a screw head, 3 is a cross-shaped groove, 4 is a bearing, 5 is a circular through hole, 6 is a screw rod, 7 is a screw, 8 is a bridge, 9 is a transverse threaded hole, 10 is a longitudinal threaded hole, 11 is a headless hexagon socket screw, 12 is a bridge body, 13 is a bottom plate, 14 is a wood screw mounting hole, 15 is a wood screw, 16 is a square hole, 17 is a square movable plate, 18 is a rear small circular groove, 19 is a rear large circular groove, 20 is a front large circular groove, 21 is a front small circular groove, 22 is a front cylindrical insert column, 23 is a rear cylindrical insert column, 24 is a chord hole, 25 is a front compression spring, 26 is a rear compression spring, 27 is a front retainer ring, 28 is a front circular baffle, 29 is a rear circular baffle, 30 is a rear retainer ring, 31 is a front annular boss, and 32 is a rear annular boss.

Detailed Description

The present invention will be further described with reference to the following examples.

Example (b): as shown in fig. 1 to 3, a bass bridge suitable for adjusting octave is designed and manufactured, and comprises a bridge body 12, a bridge 8, headless hexagon socket head bolts 11, screws 7 and wood screws 15.

In the utility model, the bridge body 12 is used for string drawing and bridge code 8 installation; the bridge 8 is used for tightening strings; a headless hexagon socket head cap screw 11 for adjusting the string height; a screw 7 for adjusting octave; and wood screws 15 for fastening the base plate 13 of the bridge body 12 to the panel at the bottom of the body.

The cross-section of the bridge body 12 is L-shaped, the bridge body 12 comprises a bottom plate 13 and an integrally formed tailpiece 1, a right angle of 90 degrees is formed between the left and right width directions of the bottom plate 13 and the upper and lower width directions of the tailpiece 1, 5 wood screw mounting holes 14 are arranged at the left upper end of the bottom plate 13 along the front and rear length directions at intervals, wood screws 15 are used for screwing the bottom plate 13 through the wood screw mounting holes 14 and fixing the bottom plate 13 on a panel at the bottom of the bridge body, and 4 bridge codes 8 are arranged at the upper right of the bottom plate 13 along the front and rear length directions at intervals.

In the utility model, the bottom plate 13 is used for fixedly connecting the tailpiece 1 and installing the bridge 8; the tailpiece 1 is used for stringing and mounting screws 7; and wood screw mounting holes 14 for mounting wood screws 15.

The bridge 8 is cylindrical, longitudinal threaded holes 10 are formed in the top ends of the front end and the rear end of the bridge 8 along the radial direction, headless hexagon socket head bolts 11 used for adjusting the string height are arranged in the longitudinal threaded holes 10, an annular groove used for erecting strings is formed in the periphery of the middle of the bridge 8 along the front length direction and the rear length direction, and a transverse threaded hole 9 matched and connected with the right end of the screw 7 is formed in the left side, located between the annular groove and the longitudinal threaded hole 10 in the front end, of the bridge 8 along the radial direction.

In the utility model, a longitudinal threaded hole 10 is used for matching and connecting with a headless hexagon socket head cap screw 11; the annular groove is used for stringing; and the transverse threaded hole 9 is used for being matched and connected with the right end of the screw 7.

The left lower end of the tailpiece 1 is arranged with 4 string holes 24 along the front and back length direction at intervals, and the string tail of the string passes through the string holes 24 and then is stretched and tightened in the annular groove of the bridge 8.

The utility model discloses in, string hole 24 for the string tail of string passes the back and tightens in the annular groove of musical instrument sign indicating number.

The utility model has the main characteristics that: the left upper end of the tailpiece 1 is provided with 4 square holes 16 at intervals along the front and rear length directions, the middle parts of the front wall thickness and the rear wall thickness of the square holes 16 are respectively provided with a front small circular groove 21 and a corresponding rear small circular groove 18, and the front small circular groove 21 and the rear small circular groove 18 are on the same axis.

In the utility model, the square hole 16 is used for installing the square movable plate 17; the front small circular groove 21 and the rear small circular groove 18 are used for being inserted with a front cylindrical insert column 22 and a rear cylindrical insert column 23 respectively, so that the square movable plate 17 can rotate around the axis of the front cylindrical insert column 22 and the axis of the rear cylindrical insert column 23 in the square hole 16.

The square hole 16 is internally provided with a square movable plate 17 which is matched with the square hole, the cross sections of the top end and the bottom end of the square movable plate 17 are circular arcs with the same axis, the left thickness and the right thickness of the square movable plate 17 and the tailpiece 1 are the same, and the square movable plate 17 can rotate in the square hole 16.

In the utility model, a square movable plate 17 is used for mounting the bearing 4; because the sections of the top end and the bottom end of the square movable plate 17 are set to be arcs with the same axis, the square movable plate 17 can flexibly rotate in the square hole 16.

The square movable plate 17 which can be flexibly rotated is arranged in the square hole 16 of the tailpiece 17, which is one of the outstanding features of the utility model. Because the square movable plate 17 can flexibly rotate in the square hole 16, the screw rod 6 can ascend or descend along with the ascending or descending of the bridge 8, and the normal adjustment of the chord height cannot be influenced.

The middle parts of the front end surface and the rear end surface of the square movable plate 17 are respectively provided with a front large circular groove 20 and a rear large circular groove 19 which are symmetrical, orifices of the front large circular groove 20 and the rear large circular groove 19 are respectively provided with a front annular boss 31 and a rear annular boss 32, the front annular boss 31 and the rear annular boss 32 are respectively provided with a front retainer ring 27 and a rear retainer ring 30 which are matched, and the front retainer ring 27 and the rear retainer ring 30 are respectively welded and fixed on the front annular boss 31 and the rear annular boss 32.

In the utility model, the front big circular groove 20 and the rear big circular groove 19 are respectively used for installing the front compression spring 25 and the rear compression spring 26 as well as the front circular baffle 28 and the rear circular baffle 29; the front annular boss 31 and the rear annular boss 32 are respectively used for welding and fixing the front retainer ring 27 and the rear retainer ring 30; and a front retainer 27 and a rear retainer 30 for preventing the front cylindrical insert 22 and the rear cylindrical insert 23 from coming out of the front large circular groove 20 and the rear large circular groove 19, respectively.

The front big circular groove 20 and the back big circular groove 19 are respectively provided with a front compression spring 25 and a back compression spring 26 which are matched, the front of the front compression spring 25 and the back of the back compression spring 26 are respectively provided with a front circular baffle 28 and a back circular baffle 29 which are matched, the diameters of the front circular baffle 28 and the back circular baffle 29 are 0.1-0.3mm smaller than the inner diameters of the front big circular groove 20 and the back big circular groove 19, the front end surface and the back end surface of the front compression spring 25 respectively prop against the back end surface of the front circular baffle 28 and the back end surface of the front big circular groove 20, the front end surface and the back end surface of the back compression spring 26 respectively prop against the front end surface of the back circular baffle 29 and the groove bottom of the back big circular groove 19, the front end of the front circular baffle 28 and the back end of the back circular baffle 29 are respectively provided with a front cylindrical insert column 22 and a back cylindrical insert column 23 which are integrally formed, the diameters of the front cylindrical insert column 22 and the back cylindrical insert column 23 are smaller than the diameters of the front circular baffle 28 and the back circular baffle 29, the front end of the front cylindrical insert column 22 and the rear end of the rear cylindrical insert column 23 respectively pass through the front retaining ring 27 and the rear retaining ring 30, and are inserted into the front small circular groove 21 and the rear small circular groove 18 forwards and backwards under the action of the elastic forces of the front compression spring 25 and the rear compression spring 26, respectively, and then the square movable plate 17 can rotate around the axes of the front cylindrical insert column 22 and the rear cylindrical insert column 23 in the square hole 16 of the tailpiece 1.

In the utility model, the front compression spring 25 and the rear compression spring 26 are respectively used for inserting the front cylindrical insertion column 22 and the rear cylindrical insertion column 23 which pass through the front check ring 27 and the rear check ring 30 into the front small circular groove 21 and the rear small circular groove 18 forwards and backwards under the action of elastic force; and a front cylindrical insert 22 and a rear cylindrical insert 23 for being inserted forward and backward into the front small circular groove 21 and the rear small circular groove 18, respectively, by the elastic force of the front compression spring 25 and the rear compression spring 26.

The center position of the front end of the square movable plate 17 is provided with a round through hole 5 corresponding to the transverse threaded hole 9.

The utility model discloses in, round through-hole 5 for fastening bearing 4.

The inside diameter of round through-hole 5 and the external diameter end of bearing 4 between the tight fit, the tight fit between the inside diameter of bearing 4 and the external diameter end of the spiral shell head 2 of screw 7, the right-hand member of the screw rod 6 of screw 7 is connected with the horizontal screw hole 9 cooperation on the musical instrument sign indicating number 8, spiral shell head 2 establishes to be cylindrical, and the diameter of spiral shell head 2 is less than the diameter of screw rod 6, and the center of the left end face of spiral shell head 2 is equipped with the "ten" font slot 3 that the phillips head screwdriver of being convenient for twists and changes.

In the utility model, the bearing 4 is fastened in the round through hole 5, and the screw head 2 of the screw 7 is fastened on the bearing 4; the right end of the screw rod 6 is matched and connected with a transverse threaded hole 9 in the bridge 8, so that the aim of adjusting octave sound can be fulfilled by moving the bridge left and right; the screw head 2 is cylindrical, and the diameter of the screw head 2 is smaller than that of the screw rod 6, so that the screw head 2 is conveniently fastened on the bearing 4 through external force; a cross-shaped groove 3 for screwing a screw 7 by a cross head screwdriver.

Install bearing 4 on the spiral shell head 2 of screw 7 is the utility model discloses an one of the outstanding characteristics, owing to install bearing 4 on the spiral shell head 2 of screw 7, be convenient for clockwise or anticlockwise twist change screw 7.

The choice of the bearing 4 is well known in the art and will not be repeated here.

Preferably, the square movable plate 17, the front circular baffle 28, the rear circular baffle 29, the front cylindrical insert column 22, the rear cylindrical insert column 23, the front retainer 27 and the rear retainer 30 are all made of alloy.

The utility model discloses in, square movable plate 17, preceding circular baffle 28, back circular baffle 29, preceding cylindrical post 22 of inserting, back cylindrical post 23 of inserting, preceding retainer ring 27 and back retainer ring 30's material are the alloy, can prevent to rust, extension product life.

The utility model discloses an operating condition is:

this bass requires an adjustment of the chord height before playing. When the string height is adjusted, the screw rod 6 can ascend or descend along with the bridge 8 along with the flexible rotation of the square movable plate 17 in the square hole 16 of the tailpiece 17.

This bass requires, in addition to the chord height, also the octave to be adjusted before playing.

When the octave is adjusted, a cross screwdriver is inserted into the cross-shaped groove 3 to clockwise or anticlockwise twist and turn a screw 7 connected between the bridge 8 and the tailpiece 1 of the bridge 12, so that the bridge 8 moves leftwards or rightwards, and the bridge 8 is adjusted to be at a proper distance from the tailpiece 1 of the bridge 12, so that the pitches after twelve tones gradually approach to be accurate, and the adjustment operation of the bass octave is easily and quickly completed.

In the process of adjusting octave, need not to loosen the string, the string is under the tight state of standard pitch, not only clockwise twist screw 7 can conveniently make bridge 8 remove left, and anticlockwise twist screw 7 can conveniently make bridge 8 remove right equally.

Claims (2)

1. A bass bridge suitable for adjusting octave comprises a bridge body (12), a bridge (8), headless hexagon socket head bolts (11), screws (7) and wood screws (15);

the cross section of the bridge body (12) is L-shaped, the bridge body (12) comprises a bottom plate (13) and an integrally formed tailpiece (1), the left and right width directions of the bottom plate (13) and the upper and lower width directions of the tailpiece (1) form a 90-degree right angle, the left upper end of the bottom plate (13) is provided with 5-7 wood screw mounting holes (14) at intervals along the front and rear length directions, wood screws (15) screw the bottom plate (13) through the wood screw mounting holes (14) and fix the bottom plate (13) on a panel at the bottom of the bridge body, and the right upper side of the bottom plate (13) is provided with 4-6 bridge codes (8) at intervals along the front and rear length directions;

the bridge (8) is cylindrical, longitudinal threaded holes (10) are formed in the top ends of the front end and the rear end of the bridge (8) along the radial direction, headless hexagon socket bolts (11) used for adjusting string heights are arranged in the longitudinal threaded holes (10), annular grooves used for erecting strings are formed in the middle circumference of the bridge (8) along the front length direction and the rear length direction, and transverse threaded holes (9) matched and connected with the right ends of the screws (7) are formed in the left side, located between the annular grooves and the longitudinal threaded holes (10) in the front end, of the bridge (8) along the radial direction;

4-6 string holes (24) are arranged at the left lower end of the tailpiece (1) at intervals along the front-rear length direction, and string tails of strings penetrate through the string holes (24) and are erected and tightened in the annular groove of the bridge (8);

the method is characterized in that: 4-6 square holes (16) are arranged at the left upper end of the tailpiece (1) at intervals along the front-rear length direction, the middle parts of the front wall thickness and the rear wall thickness of the square holes (16) are respectively provided with a front small circular groove (21) and a corresponding rear small circular groove (18), and the front small circular groove (21) and the rear small circular groove (18) are on the same axis;

the square hole (16) is internally provided with a square movable plate (17) which is matched with the square hole, the sections of the top end and the bottom end of the square movable plate (17) are circular arcs with the same axis, the left thickness and the right thickness of the square movable plate (17) and the left thickness and the right thickness of the tailpiece (1) are the same, and the square movable plate (17) can rotate in the square hole (16);

the middle parts of the front end surface and the rear end surface of the square movable plate (17) are respectively provided with a front large circular groove (20) and a symmetrical rear large circular groove (19), orifices of the front large circular groove (20) and the rear large circular groove (19) are respectively provided with a front annular boss (31) and a rear annular boss (32), the front annular boss (31) and the rear annular boss (32) are respectively provided with a front check ring (27) and a rear check ring (30) which are matched with each other, and the front check ring (27) and the rear check ring (30) are respectively welded and fixed on the front annular boss (31) and the rear annular boss (32);

a front compression spring (25) and a rear compression spring (26) which are matched are respectively arranged in the front large circular groove (20) and the rear large circular groove (19), the front surface of the front compression spring (25) and the rear surface of the rear compression spring (26) are respectively provided with a front circular baffle plate (28) and a rear circular baffle plate (29) which are matched, the diameters of the front circular baffle plate (28) and the rear circular baffle plate (29) are 0.1-0.3mm smaller than the inner diameters of the front large circular groove (20) and the rear large circular groove (19), the front end surface and the rear end surface of the front compression spring (25) are respectively tightly propped against the rear end surface of the front circular baffle plate (28) and the groove bottom of the front large circular groove (20), the front end surface and the rear end surface of the rear compression spring (26) are respectively tightly propped against the front end surface of the rear circular baffle plate (29) and the groove bottom of the rear large circular groove (19), the front end of the front circular baffle plate (28) and the rear end of the rear circular baffle plate (29) are respectively provided with a front cylindrical insert column (22) and a rear cylindrical insert column (23) which are integrally formed, the diameters of the front cylindrical insert column (22) and the rear cylindrical insert column (23) are smaller than the diameters of the front circular baffle plate (28) and the rear circular baffle plate (29), the front end of the front cylindrical insert column (22) and the rear end of the rear cylindrical insert column (23) respectively penetrate through the front check ring (27) and the rear check ring (30), and are respectively inserted into the front small circular groove (21) and the rear small circular groove (18) forwards and backwards under the elastic force action of the front compression spring (25) and the rear compression spring (26), and then the square movable plate (17) can rotate in the square hole (16) of the tailpiece (1) around the axes of the front cylindrical insert column (22) and the rear cylindrical insert column (23);

a circular through hole (5) corresponding to the transverse threaded hole (9) is formed in the center of the front end of the square movable plate (17);

the internal diameter of circle through-hole (5) and the external diameter end of bearing (4) between tight fit, tight fit between the internal diameter of bearing (4) and the external diameter end of the spiral shell head (2) of screw (7), the right-hand member of screw rod (6) of screw (7) is connected with horizontal screw hole (9) cooperation on musical instrument sign indicating number (8), spiral shell head (2) are established to cylindrically, the diameter of spiral shell head (2) is less than the diameter of screw rod (6), the center of the left end face of spiral shell head (2) is equipped with "ten" font slot (3) that the phillips screwdriver of the crosshead of being convenient for was twisted and is changeed.

2. The bass bridge suitable for adjusting octave according to claim 1, wherein the square movable plate (17), the front circular baffle (28), the rear circular baffle (29), the front cylindrical insert column (22), the rear cylindrical insert column (23), the front retainer ring (27) and the rear retainer ring (30) are made of alloy.

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