JPS6333248Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tremolo device for a stringed instrument, and is characterized in that it is constructed so that the rotational torque of a tremolo arm for operating the tremolo device can be selected as desired.

A conventional tremolo device includes a bridge base that is attached to the body of a stringed instrument so as to be rotatable in directions toward and away from the body; A bridge member that locks the strings, a spring that biases the bridge base so that it always contacts the body of the stringed instrument, and a spring that is screwed onto the bridge base and rotates the bridge base in a direction toward and away from the body of the string instrument. and a tremolo arm, the bridge bass is rotated by operating the tremolo arm, thereby intentionally changing the tension of the strings, and the undulation of the pitch is used as a tremolo effect during performance. It is.

The above-mentioned tremolo arm is normally removed to a position where it does not interfere with the performance when not in use, and is pulled toward the player's hand when the tremolo effect is desired, so the rotational torque when pulling the arm can be adjusted to suit the player's preference. It is desirable to be able to set it.

In other words, there are two types of players of this type of musical instrument: those who prefer to play with the tremolo arm in a free state by weakening the rotational torque of the tremolo arm, and those who prefer to play with the tremolo arm in a free state at all times by weakening the rotational torque of the tremolo arm. This is because some people prefer to perform while being able to fix their position.

However, in conventional tremolo devices of this type, the tremolo arm is simply screwed onto the bridge base, so the tremolo arm must be screwed in completely to keep it in a fixed state, or it can be screwed in halfway to keep it in place at all times. There is no option other than leaving it in a free state, and therefore it is not possible to adjust the rotational torque of the tremolo arm to personal preference.

The present invention aims to provide a tremolo device for stringed instruments that eliminates the above-mentioned disadvantages.

The device of the present invention will be explained below with reference to the accompanying drawings. Fig. 1 is a sectional view of the tremolo device of the invention, and Fig. 2 is a perspective view of the same. In the figure, 1 is a stringed instrument body, 2 is a bridge base, 3 is a bridge member, 4 is an octave adjustment screw rod, 5 is a string, 6 is a tremolo arm, and 7 is an arm bearing.

The bridge base 2 includes, for example, mounting holes 21, 21 provided at the front end in the string tension direction, a projecting edge 22 that is bent upward at the rear end in the string tension direction, and a locking member 51 for the string 5. The above bridge base 2
A required number of notches 23 are provided on the projecting edge 22 for side locking, and a string insertion hole 24 is provided near the front of the notch 23 along the string tensioning direction and through which the string 5 is inserted. It has

A support piece 25 is provided on the back side of the bridge base 2.
is fixed substantially vertically, and the supporting piece 25 extends into the recess 11 formed in the stringed instrument body 1, and has a return means, for example, one end of a spring 26 fixed to its tip, and 26 is the recess 11
The other end is fixed to the wall of the bridge base 2, so that the bridge base 2 is always in contact with the body 1 of the stringed instrument. The mounting holes 21, 21 have a sharp edge 21 formed from the rear side of the hole edge toward the center.
a, 21a and the above-mentioned mounting holes 21,
Washers 211, 21 are placed between 21 and the stringed instrument body 1.
1, and a stator, for example, screws 212, 212, which pass through the mounting holes 21, 21 and the washers 211, 211, are fixed to the stringed instrument body 1.

The washers 211, 211 have conical upper portions, while the screws 212, 212 have inverted conical heads, resulting in a V-shaped concave cross section when viewed from the side. forming a groove.

Therefore, since the sharp edges 21a, 21a are pressed against the groove by the tension of the strings 5 and the tension of the spring 26, the bridge base 2 is attached to the stringed instrument body 1 using the groove as a pivot point. It rotates toward and away from the target.

The projecting edge 22 has insertion holes 22a at six locations in the embodiment, into which the octave adjustment screw rods 4 are inserted, and each of the octave adjustment screw rods 4 extends in the string tension direction and has its tip end. The above-mentioned bridge member 3 is screwed onto the holder.

The head 41 of the octave adjustment screw rod 4 is
is attached to the bridge base 2 so that the bridge member 3 can be moved forward and backward along the stringing direction by rotating the head 41.

A coil spring 42 is attached to the octave adjustment screw rod 4 along the axial direction, and the forward biasing force of the coil spring 42 causes the bridge member 3 to be always positioned forward in the string tension direction. I'm being forced to do it.

The bridge member 3 includes a string contact surface 31 whose front end portion is folded upward to bulge out, and a pair of string height adjustment screws 3 which are vertically screwed into the string contact surface 31 from above.
As shown in FIG. They are sequentially arranged in a direction perpendicular to the string tensioning direction so as not to block the string insertion hole 24 when moved.

Furthermore, by making the bridge member 3 into a bent shape and opening the string insertion hole 24, the cutout portion 23 and
The string insertion hole 24 and the line 1 connecting the center of the string contact surface 31 coincide with the string tension direction.

The lower ends of the string height adjustment screws 32, 32 are in contact with the bottoms of guide grooves 2a, 2a recessed in the upper surface of the bridge base parallel to the stringing direction, and as a result, the bridge member 3 is By rotating the octave adjustment screw rod 4, tuning can be performed by moving the strings back and forth accurately along the stringing direction, and by rotating the string height adjustment screws 32, 32, the bridge member 3 can be tuned. You can set the desired string height by changing the height of the string.

The notch 23 is provided in the insertion opening 2 at the protruding edge 22.
2a are provided at six locations alternately, and the locking member 51 of the string 5 is locked in the notch 23 on the bridge base 2 side, and the string 5 is inserted into the string insertion hole 2.
4 from the outside of the bridge base 2. In this case, as mentioned above, the line l connecting the notch 23, the string insertion hole 24, and the center of the string contact surface 31 should be aligned with the string tension direction. Since the setting has been made, the string 5 inserted through the string insertion hole 24 is placed on the string contact surface 3.
The strings 5 can be tensioned by pulling them out into the strings 1 and winding them around the string winding tool at the head of the stringed instrument.

The tremolo arm 6 has its straight body part 6' inserted into the arm bearing part 7 and rotatably supported, and its outwardly projecting part is bent so as to be substantially parallel to the body part 1 of the stringed instrument. ing.

Therefore, when the player rotates the outwardly protruding portion of the tremolo arm 6 in the direction toward and away from the stringed instrument body 1, the bridge base 2 is rotated about the groove, thereby producing the tremolo effect. can be obtained.

As shown in FIG. 4, for example, the tremolo arm 6 has three locking grooves 61 circumferentially provided in parallel in the axial direction at its base end and along the axial direction perpendicular to these locking grooves 61. In addition to the formed cutout surface 62, an oil reservoir for storing lubricating oil formed in the straight body part, for example, an oil groove 63 provided around the straight body part, is provided.

The arm bearing portion 7 is connected to the tremolo arm 6.
A bearing member 71 provided on the back surface of the bridge base 2 to support the proximal end of the tremolo arm 6, a hollow cylindrical screw-shaped tightening member 72 configured to tighten the outer periphery of the tremolo arm 6, Attachment member 7
2, and a locking piece 74 which is inserted into the bearing member 71 from the horizontal direction and which locks into the locking groove 61 of the tremolo arm 6.

The bearing member 71 is fixed to the bridge base 2 by a fixing means such as welding, and has an arm insertion hole 711 vertically bored in communication with a through hole provided in the bridge base 2, This arm insertion hole 711 has a tapered female thread part 711a formed so that the diameter thereof gradually decreases as it goes downward from the opening, and a tapered female thread part 711a that is disposed below this female thread part 711a and has the above-mentioned tapered female thread part 711a. An insertion hole 711b into which the base end of the tremolo arm 6 is inserted is provided.

The insertion hole 711b is provided with a through hole 711c which is perpendicular to the insertion hole 711b, and by inserting the locking piece 74 into the through hole 711c, the insertion hole 711c is inserted into the insertion hole 711c. A locking protrusion 74a is formed protrudingly on the side wall of 711b.

In the embodiment, the tightening member 72 includes a male thread part 721 provided on the outer peripheral surface so as to be screwed with the tapered female thread part 711a, and two thread parts cut out so as to open downward along the axial direction. Therefore, when the tightening member 72 is screwed into the tapered female thread portion 711a, the notch grooves 722, 722 reduce the diameter of the tightening member 72. The rotational torque of the tremolo arm 6 is thereby increased or decreased.

The position fixing nut 73 fixes the position of the tightening member 72 by coming into contact with the upper surface of the bridge base 2, thereby increasing the tightening force of the tightening member 72 to the tremolo arm 6. ,
Therefore, the rotational torque of the tremolo arm 6 can be adjusted and set.

The engaging piece 74 is formed in a U-shape such that both ends gradually approach the opening as shown in FIG. 6, and is made of an elastic material such as piano wire, as shown in FIG. As shown in FIG.

It is preferable that the bearing member 71 is provided with a fitting groove 711d into which the outwardly extending portion of the locking piece 74 is fitted, and in this way the position of the locking piece 74 can be prevented from shifting.

In the above, the tremolo device of the present invention can also be constructed as follows.

The bearing member 71 may be formed separately from the bridge base 2, or may be formed integrally with the bridge base 2, or in some cases, may be formed integrally with the support piece 25.

Furthermore, the above-mentioned locking protrusion 74a is connected to the above-mentioned insertion hole 7.
11b may be provided so as to protrude directly from the side wall. In this case, the above-mentioned engaging piece 74, through hole 711c, and fitting groove 7
11d is unnecessary, and moreover, one or more locking grooves 61 provided in the tremolo arm 6 may be provided, but if three are provided as described above, these three are selected and the locking grooves 61 are selected. There is an advantage that the height of the tremolo arm 6 can be freely changed by engaging with the projection 74a.

Normally, one oil groove 63 is sufficient as the oil reservoir, but a plurality of shallow grooves may be provided as in the embodiment.

As shown in FIG. 7, the tremolo arm 6 has a threaded portion 64 formed at the base end of its straight body portion 6′, and this threaded portion 64 is screwed into the insertion hole 711b′ of the bearing member 71. In this case, the insertion hole 711b' is formed in the female thread part, and the threaded part 64 at the base end is inserted into the insertion hole 711b so that the tremolo arm 6 can rotate freely. ' will be screwed on.

The present tremolo device has a structure in which the torque is adjusted by tightening the tremolo arm 6, which is rotatably attached to the bearing member 71, by the tightening member 72, so that the user can make his own torque adjustment. In addition, since an oil reservoir is provided in the straight body portion 6' of the tremolo arm 6, even if frictional heat is generated between the tremolo arm 6 and the tightening member 72 due to frequent operation of the tremolo arm 6, Thereby, an accident in which the tremolo arm 6 seizes on the tightening member 72 can be effectively prevented.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional side view of the proposed tremolo device;
The figure is a perspective view of the same device as above, FIG. 3 is a plan view of a bridge member used in the above device, FIG. 4 is a longitudinal cross-sectional side view of the arm bearing part of the above device, and FIG. 6 is a plan view of the engagement piece shown in FIG. 5, and FIG. 7 is a longitudinal sectional side view showing another embodiment of the arm bearing portion of the present device. In the diagram, 1 is the stringed instrument body, 2 is the bridge bass, 2
1 is a through hole for mounting, 22 is a ridge, 23 is a notch, 2
4 is a string insertion hole, 3 is a bridge member, 31 is a string contact area, 32
is the string height adjustment screw, 4 is the octave adjustment screw, 5 is the string, 6 is the tremolo arm, 6' is the straight body part,
61 is a locking groove, 62 is a notch surface, 63 is an oil groove as an oil reservoir, 7 is an arm bearing portion, 71 is a bearing member,
711 is an arm insertion hole, 711a is a tapered female thread portion, 711b and 711b' are insertion holes, 72 is a tightening member, 722 is a notched groove, 73 is a position fixing nut, 74 is a locking piece, and 74a is a The locking protrusions are shown respectively.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A bridge base that is attached to the body of a stringed instrument so as to rotate in a direction toward and away from the body, and is always urged to approach the body of the stringed instrument by a return means. In the tremolo device, the tremolo device includes an arm bearing provided in a part of the bridge base, and a tremolo arm that is irremovably latched to the arm bearing and is rotatably inserted into the arm bearing. is provided with a female thread portion formed such that the diameter gradually decreases as it goes downward from the opening, and a screw-shaped hollow tightening member is screwed into this female thread portion, and the tightening member is screwed into the female thread portion. The straight body part of the tremolo arm is inserted into the hollow part, and a cutout groove is provided along the axial direction so that the diameter can be reduced as the tightening member is screwed into the female thread part. A tremolo device for a stringed instrument, wherein an oil reservoir is formed in the straight body of the tremolo arm, and lubricating oil is stored in the oil reservoir. 2. Utility model registration claim 1, in which the oil reservoir is an oil groove provided around the straight body of the tremolo arm.
Tremolo device for stringed instruments as described in Section 1.