JPS6146992A - Tremolo mechanism for guitar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a guitar tremolo R side that applies tremolo by temporarily gradually weakening or increasing the tension of the strings during a performance, and more particularly relates to a tremolo R side for a guitar that applies a tremolo by temporarily weakening or increasing the tension of the strings during a performance. The structure of the elastic rotating shaft of the string tension variable device provided between the piece and the locking part that locks the upper end of the string, and the structure of the bridge piece that pivotally supports the bridge roller for fixing the position of the string. , and a Wi construction of a tremolo arm attachment device attached to the tension variable device.

(Problems to be Solved by the Invention) The present invention provides a torsion spring with a significantly large elasticity limit as an elastic rotation shaft of a string tension variable device, and supports a bridge roller for fixing the string position to smoothly rotate the spring. To provide a tremolo arm mounting device capable of providing a bridge piece capable of maintaining constant rotation, and capable of firmly mounting a tremolo arm by a simple tightening mechanism, or easily adjusting its tightening force.

(Means for Solving the Problems) The present invention provides a bridge piece that supports each string stretched between the head of the guitar and the shell of the body, and a lock that locks the end of each string on the shell side. By pushing or pulling up the tremolo arm against the elastic force of a torsion bar, which has a spiral groove carved on its outer periphery between the stop part and the torsion bar, the string is rotated around the torsion bar. This is a guitar tremolo mechanism that is equipped with a tension variable device that changes the tension of the guitar.

(Example) Next, the configuration of a first example of the present invention will be described with reference to the drawings.

The front and rear plates 3.4 are attached to the body shell 2 of the electric guitar 1.
The left and right frame portions 5.6 are integrally formed with the left and right frame portions 5.6 and are attached with screws 7, and a tension roller 11 for each string 10 is attached to the front plate 3 via a tension bracket 9 attached to the bridge joint 8. In addition to being rotatably mounted around a shaft 12, a bridge piece 13 is coupled to a pin 14 at the bridge joint 8.

As shown in FIGS. 6 and 7, the bridge piece 13 is for pivotally supporting each string-specific bridge roller 15, which is provided with a groove through which the string 10 passes. A pair of symmetrical sabots 1 to 16 are protruded from the support 13 at regular intervals, and one of the supports 16 is provided with a stepped hole 17.
and m screw holes 18 are provided on the same axis on the other side. A bridge roller 15 and a pair of plastic washers 19 are inserted between the pair of supports 16 and 16, and a shaft 20 has a male thread formed at the tip.
Insert the pair of washers 19 and bridge roller 15 through one support 16 and screw into the other support 16.
It's tightened.

Further, between the bases of the pair of supports 16.16, a cut groove 2'1 is provided in the direction toward the base of the bridge piece 13 so that the distance between the supports 16 can be expanded or contracted.
A stopper 22 is provided to protrude from one side wall surface of 1 toward the other side wall surface with an arbitrary protrusion amount.

Each bridge piece 13 is mounted so that it can be moved up and down by screws 23, and can be adjusted forward and backward by tightening screws 24 to move the bridge joint 8 back and forth (in the left-right direction in FIG. 4).

On the other hand, as shown in Fig. 5, a cylindrical main rotor 25 with one end rotatably supported by the right frame part 6 is inserted between the left and right frame parts 5. One end of the spring shaft 26 is supported by the left frame portion 5 via a cam plate 27, and the other end is attached to the main rotor 25 while being integrally connected with a pin (not shown).

As shown in FIG. 6, the spring shaft 26 has one or more spiral grooves 28 carved on the outer periphery of the torsion bar, and has a higher elasticity limit than a simple torsion bar of the same length and diameter. I am using a larger version of .

Next, on the main rotor 25, a bending piece 29 that presses the strings 10 is rotatable around the pin 30, and is connected to the string 1 from the axial center of the spring shaft 26 for each string 10 by means of a screw 31.
It is installed so that the distance to the pressure contact surface 32 with 0 can be adjusted,
In addition, the pressure contact surface of the bend adjustment piece 29 with the string 10 is such that the pressure contact distance from the center of the spring shaft 26 to the pressure contact position of the string 10 gradually decreases at an arbitrary rate of change as the main rotor 25 rotates counterclockwise in FIG. For example, it is formed with an arbitrary oval curve.

The main rotor 2 with the vent adjustment piece 29 attached in this way
A fine tuner frame 33 is integrally attached to the fine tuner frame 33 via screws 34 to the fine tuner frame 33.
A tremolo arm 35 is attached to the tremolo arm 35 for rotating the main rotor 25 counterclockwise in FIG. 4 against the biasing force of the spring shaft 26.

Therefore, the tremolo arm 35 has a male thread 36 at its lower end.
The sleeve 38 is formed to have an inner diameter slightly larger than that of the tremolo arm 35 and has a male thread 37 carved in its lower half. A mounting hole 41 is formed in the fine tuner frame 33 in order to form a tapered surface 39 for tightening that has a reduced diameter and fit a bushing 40 that comes into contact with the lower end surface of the sleeve 38, and to mount the tremolo arm 35 thereon.
is formed with a female thread 42, a tapered surface 43, and a female thread 44 corresponding to the male thread 37 of the sleeve 38, the tapered surface 39 of the bushing 40, and the male thread 36 of the tremolo arm 35, respectively.

Next, a fine tuner device 47 whose locking position can be adjusted in the front-rear direction with the bobbin-shaped end piece 45 attached to the end of each string 10 supported by the conical piece receiver 46
That is, to turn left and right a tuner nut 52 attached to a tuner rod 51 that forms a piece receiver 46 and is articulated with a pin 50 at the tip of a tuner arm 49 for each string 10 that is rotatable around a pin 48. A fine tuner device 47 is attached to adjust the tension of each string 10 by changing the front and rear locking positions.

In this case, as shown in FIG. 11, since the piece receiver 46 that supports the bobbin-shaped end piece 45 at the end of the string 10 is formed into a conical shape, the posture of the end piece 45 within the piece receiver 46 is changed vertically and horizontally. Even if the end piece 45 is in any diagonal position, the tension of the string 10 after tuning can be kept constant and the string 10 can be positioned at the center of the cone.
In addition to eliminating the problem of the string 10 being displaced in any direction (up, down, left or right) and coming into contact with the four tuner arms and breaking the string 10, in particular, the posture of the end piece 45 changes as the tension of the string 10 changes due to the use of tremolo during performance. In this case, it is possible to maintain a stable tuning state.

Note that 53 is a fine tuner cover on the top surface of the fine tuner device 47.

Next, the operation of this embodiment will be explained.

In the tremolo mechanism 54 configured in this way, the pressure contact surface 32 of the bend adjustment piece 29 for each string 10 with the string 10 is moved from the rotation center of the main rotor 25 to the pressure contact surface 32 by the rotation of the main rotor 25 by the tremolo arm 35. For example, the distance change (Sl in FIG. 12) is larger for the first string 10-1 and smaller for the sixth string 10-6, and the rate of change is determined by the change in locking position ff1 (Sl in FIG. 12). 82), each string 10 can be made into an arbitrary oval curved shade that changes by one degree of the scale. In this case, the tremolo can be changed by chord, and the pressure contact position or pressure contact surface can be changed. By arbitrarily forming the curve 32, the tremolo effect caused by the pressing angle of the tremolo arm 35 can be made to vary depending on the angular position.

Further, the base of the tremolo arm 35 is strongly fastened because the tapered surface 39 of the bushing 40, which is pushed down along the tapered surface 43 of the mounting hole 41 by the tightening of the sleeve 38, is firmly tightened by the tightening effect. Such a tightening operation can be easily performed during a performance simply by turning the sleeve 38, and the tremolo arm 35 can be easily tightened by simply turning the sleeve 38.
By adjusting the play of the main rotor 25, the strength of the brake can be adjusted to suit individual preference.

Also, the tremolo arm 35 is attached to the fine tuner frame 3.
The spring shaft 26 can be easily made for left-handed use by attaching it to the screw hole 55 at the symmetrical position of the torsion bar. Therefore, when a rotational force is applied to the spring shaft 26, the stress is in a direction parallel to the spiral and becomes close to a tensile stress in the same direction, so that the elastic limit of the spring shaft 26 can be significantly increased.

Next, the fine tuner device 47 can be attached independently to the rear plate portion 4 without being attached to the fine tuner frame 33, and in this case, the change in each string 10 by pushing the tremolo arm 56 can be made even larger.

Also, the bridge roller 15 of the bridge piece 13 is connected to the shaft 20.
By tightening, the pair of supports 16 can be properly fixed via the washer 19, and on the other hand, the stopper 22 can prevent excessive tightening, and from this point, the play of the bridge roller 15 can be eliminated to ensure its smooth rotation.

Next, the structure and operation of the second embodiment of the present invention will be explained.

In this embodiment, instead of the bend adjustment piece 29, a lever-shaped rail 56 is attached to the bin 30 as shown in FIGS. 13 to 16.

The rail 56 has a trough-shaped cross section with a valley-shaped central portion in the lateral direction, and a roller carrier 57 that is guided by the rail 56 and rotates thereon is fitted therein. The roller carrier 57 has a substantially V-shaped cross-sectional shape corresponding to the rail 56, and a pair of left and right tightening screws 58, 58 are attached to the sliding contact portion with the rail 56, and when the screws 58 are loosened, The roller carrier 57 can slide on the rail 56 and the screw 58
When the roller carrier 57 is tightened, the roller carrier 57 is secured to an arbitrary position on the rail 56.

Further, as shown in FIG. 15, a pinion gear 60 has one of the screws 58 and 58 supported by a rotation shaft 59.
Instead, this is replaced with a rack 61 formed correspondingly to the rail 56.
The fixing position of the roller carrier 57 may be finely adjusted by rotating the pinion gear 60.

Next, a shaft 63 for supporting a roller 62 that is pressed against the string 10 is floatingly provided in the central trough of the roller carrier 57, and a groove 63 is provided in the central bottom surface of the roller carrier 57 to prevent the roller 62 from coming into contact with the string 10. A notch is formed. Further, 65 is a plastic washer that is inserted between both sides of the roller 62 to allow the roller 62 to rotate smoothly.

From the above points, the fixed position of the roller 62 can be displaced to any position with respect to the axis of the main rotor 25,
Therefore, when the main rotor is rotated by the tremolo arm, the rate of change in tension of the string pressed against the roller 62 can be arbitrarily changed.

(Effects of the Invention) The present invention increases the elastic limit of the spring shaft in a guitar string tension variable device, making it easier to operate the tremolo arm, and firmly tightening the base of the tremolo arm so that the spring shaft does not move during performance. By stabilizing the position of the tremolo arm and adjusting its clamping force, the braking force for regulating the position of the tremolo arm can be easily adjusted according to individual preference, even during performance. It has the effect of preventing the generation of sound.

Further, in the second embodiment of the present invention, the tension of the strings is changed by a lever action of a lever-like rail that fixes a roller that is pressed against the strings, thereby changing the wire diameter, elongation rate, material, etc. of each string. This has the effect of making it possible to obtain an appropriate tremolo effect in accordance with the player's preferences.

[Brief explanation of the drawing]

Fig. 1 is a front view of the entire embodiment of the present invention, Fig. 2 is a perspective view of its tremolo m structure, Fig. 3 is a side view of its main parts, and Fig. 4 is a front view of the entire embodiment of the present invention.
Figure 5 is a front view of the main part, Figure 6 is a perspective view of the spring shaft and an enlarged cross-sectional view of the main part, and Figure 7 is an exploded perspective view of the bridge piece. , FIG. 8 is a vertical cross-sectional view of the main part thereof, FIG. 9 is an exploded perspective view showing the tightening device of the tremolo arm, FIG. 10 is a central vertical cross-sectional view of the tremolo arm, and FIG.
1 is an explanatory diagram of the main part of the tremolo mechanism, FIG. 12 is an explanatory diagram of its operation, FIG. 13 is a diagram showing the main part of the second embodiment of the present invention, FIG. 14 is a sectional view of the main part, and FIG. The figure also shows the main parts of the other embodiment, and FIG. 16 is a plan view thereof. 1... Electric guitar 2... Body shell 13...
・Bridge piece 15...Bridge row 519・
... Washer 21 ... Cut groove 22 - ... Stopper 25 ... Main rotor 26 ... Spring shaft 35 ... Tremolo arm 38 ...
Sleeve 40... Push 54... Tremolo line drawing

Claims (4)

[Claims] (1) Between the bridge piece that supports each string that is stretched between the head of the guitar and the upper part of the body, and the locking part that locks the upper end of each string, A tension variable device is provided that rotates around the torsion bar and changes the tension of the string by at least pushing a tremolo arm against the elastic force of a torsion bar in which several spiral grooves are carved. A tremolo mechanism for guitars that is characterized by: (2) A pair of supports that are to be fastened with screws that pivotally support the bridge roller are provided protruding from the bridge piece, and a groove that gives elasticity to the support is provided between the bases of the pair of supports. 2. The guitar tremolo mechanism according to claim 1, wherein washers are inserted between both sides of the bridge roller to ensure smooth rotation of the bridge roller. (3) At the base of the tremolo arm to be attached to the tension variable device, there is a sleeve with a male thread carved in it, and a sleeve with a C-shaped cross section and a tapered surface for tightening on the outer periphery, and a sleeve on the lower end surface of the sleeve. A bush to be abutted is fitted, and the mounting hole of the tremolo arm is formed with a female thread and a tapered surface corresponding to the male thread and the tapered surface of the bush, respectively. The guitar tremolo mechanism described in item 1. (4) The roller that comes into pressure contact with the strings is pivotally supported by a roller carrier that slides along a lever-shaped rail that is integrally attached to the main rotor that rotates with the torsion bar and can be fastened to any part of the rail. Claim 1, characterized in that the position of the roller is displaced to an arbitrary position with respect to the axis of the main rotor by rotating the roller carrier based on the rotation of the main rotor and adjusting the fastening part on the rail. Guitar tremolo mechanism described in section.