Tuning fork capable of modulating frequency

Abstract

The utility model provides a frequency-adjustable tuning fork, which comprises two vibration arms and a fork handle, the top end of the fork handle is provided with two vibration arms, each vibration arm is provided with a frequency conversion part which can move up and down along the vibration arm and is fixed according to the required position, the middle part of each frequency conversion part is provided with a through hole sleeved on the vibration arm, and the side surface of each frequency conversion part is provided with an adjusting nut; a first connecting part is arranged on the left side of the penetrating hole, a second connecting part and a third connecting part are arranged on the front side and the rear side of the penetrating hole respectively, a fourth connecting part is arranged on the right side of the penetrating hole, a fifth connecting part is arranged on the inner side of the fourth connecting part, a through hole is formed in the center of the fifth connecting part, and threads are arranged in the through hole and used for allowing an adjusting nut to penetrate through. The end, close to the penetrating hole, of the adjusting nut is fixedly connected with a locking part. According to the frequency-adjustable tuning fork, the frequency conversion part is improved, the contact face of the adjusting nut and the fork handle is increased, the frequency conversion part can abut against the fork handle and is not prone to moving, and the frequency-adjustable tuning fork is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to a tuning fork, in particular to a frequency-adjustable tuning fork. Background Art

[0002] A tuning fork is a common experimental instrument in physics. It is a Y-shaped sound generator made of steel or aluminum alloy that produces a single-wavelength mechanical wave. Different tuning forks can produce pure tones of different wavelengths, depending on their size and the length and height of their tines. Longer tines, or higher tines, produce longer wavelengths and lower-pitched tones. Shorter tines, or lower tines, produce shorter wavelengths and higher-pitched tones.

[0003] Patent No. 201120223986.0 discloses a frequency-adjustable tuning fork. The fork handle is equipped with two arms, each secured with a frequency converter via an adjustment nut. The frequency converter is cylindrical and fits axially over the arms. During use, the adjustment nut can easily loosen, causing the frequency converter to move on the arms. Therefore, the issue of how to position the frequency converter more closely is a concern.

[0004] Furthermore, when the frequency converter is located in different positions, the frequency generated when the tuning fork is struck is also different; when the weight of the frequency converter is different, the frequency generated when the tuning fork is struck is also different. When studying physical phenomena such as resonance, by adjusting the frequency converter on the tuning fork, we can better understand resonance. Utility Model Content

[0005] The utility model provides a frequency-adjustable tuning fork, which solves the problem of frequency conversion parts being tightly pressed together by adjusting the nut. The technical solution is as follows:

[0006] A frequency-adjustable tuning fork comprises a vibration arm and a fork handle, wherein two vibration arms are provided at the top end of the fork handle, and a frequency converter is provided on the vibration arm which can move up and down along the vibration arm and be fixed in a required position, a through hole is provided in the middle of the frequency converter and is sleeved on the vibration arm, and an adjusting nut is provided on the side; the left side of the through hole is a first connecting part, the front and rear sides are respectively a second connecting part and a third connecting part, and the right side is a fourth connecting part, a fifth connecting part is provided on the inner side of the fourth connecting part, the center of the fifth connecting part is a through hole, the through hole is provided with a thread for passing the adjusting nut, and the adjusting nut is fixedly connected to a locking part at one end close to the through hole.

[0007] The perforation of the frequency conversion component has the same shape as the cross section of the vibration arm.

[0008] The frequency conversion component is in the shape of a cylinder or a cuboid.

[0009] The total length of the fifth connecting portion plus the length of the locking portion is less than the length of the fourth connecting portion.

[0010] The locking portion has a height smaller than that of the fifth connecting portion.

[0011] The locking portion has a shape that can be used for tightening and is not limited to a circular shape.

[0012] The adjusting nut includes a locking portion and a bolt portion connected to each other. The outer side of the bolt portion is provided with a thread for passing through the through hole in the center of the fifth connecting portion and being connected to the fifth connecting portion via the thread.

[0013] One side of the bolt portion is fixedly connected to the center of the locking portion, and the other side is provided with a hexagonal groove for adjustment by a hexagonal wrench.

[0014] When adjusting nuts are provided on both sides of the frequency converter, the structures of the two sides are symmetrical or asymmetrical, that is, the sizes and / or positions of the two adjusting nuts are different.

[0015] The cross section of the vibration arm may also be circular, triangular or rectangular.

[0016] The frequency-adjustable tuning fork improves the frequency converter and increases the contact surface between the adjusting nut and the fork handle. The frequency converter can be closely attached to the fork handle and is not easily moved. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the frequency-adjustable tuning fork;

[0018] Figure 2 is a cross-sectional schematic diagram of the first embodiment of the frequency conversion component;

[0019] Figure 3 It is a cross-sectional schematic diagram of the second embodiment of the frequency conversion component. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, the adjustable frequency tuning fork includes a vibration arm and a fork handle 1. The top of the fork handle 1 is provided with two vibration arms, which are divided into a first vibration arm 2 and a second vibration arm 3. The lower ends of the first vibration arm 2 and the second vibration arm 3 are arc-shaped and connected together. A frequency converter 4 can be fixedly mounted on the two vibration arms. A through-hole 5 is provided in the middle of the frequency converter 4 for being put onto the vibration arm from the upper end of the vibration arm. An adjusting nut 6 is provided on the side of the frequency converter 4. By tightening the adjusting nut 6, the other end of the adjusting nut 6 contacts the vibration arm, thereby fixing the position of the frequency converter 4.

[0021] Furthermore, the perforation of the frequency converter has the same cross-sectional shape as the vibrating arm, and the shape of the frequency converter 4 is cylindrical, rectangular, or other shapes. The cross-sectional shape of the vibrating arm is rectangular, and correspondingly, the cross-sectional shape of the perforation 5 is also rectangular. The cross-sectional shape of the vibrating arm can also be circular, triangular, or other shapes.

[0022] The middle part of the frequency converter 4 is a through hole 5, the left side of the through hole is the first connecting part 7, the front and rear sides are the second connecting part and the third connecting part respectively, and the right side is the fourth connecting part. The fifth connecting part is provided on the inner side of the fourth connecting part, and the center of the fifth connecting part is a through hole. The through hole is provided with a thread for passing the adjusting nut 6, and the adjusting nut 6 is fixedly connected to a locking part at one end close to the through hole 5.

[0023] The total length of the fifth connecting portion plus the length of the locking portion is less than the length of the fourth connecting portion, and the height of the locking portion is less than the fifth connecting portion. Thus, within the space formed by the fourth and fifth connecting portions, the locking portion can be rotated left or right via the adjustment nut 6, thereby locking or loosening the vibrating arm. Furthermore, the locking portion is circular.

[0024] like Figure 2 In the cross-sectional view shown, the distance between the upper end 8 of the fourth connecting portion and the lower end 10 of the fourth connecting portion is greater than the height of the locking portion 12. The inner side of the fourth connecting portion is the fifth connecting portion, and the upper end 8 of the fourth connecting portion is located above the upper end 9 of the fifth connecting portion. The lower end 10 of the fourth connecting portion is located below the lower end 11 of the fifth connecting portion. Between the upper end 9 of the fifth connecting portion and the lower end 11 of the fifth connecting portion is the bolt portion 13 of the adjusting nut 6.

[0025] The adjusting nut 6 includes a connected locking portion 12 and a bolt portion 13. The bolt portion 13 is threaded on its outer side and is adapted to pass through a through hole in the center of the fifth connecting portion and be threadedly connected to the fifth connecting portion. One side of the bolt portion 13 is fixedly connected to the center of the locking portion 12, while the other side is provided with a hexagonal groove 14 for adjusting the position of the adjusting nut 6 using an Allen wrench (or hexagonal screwdriver).

[0026] Use an Allen wrench to insert into the hexagonal groove 14, rotate the Allen wrench to make the adjusting nut 6 move toward the vibration arm. When the other side of the locking part 12 contacts the vibration arm, continue to rotate the Allen wrench until it is locked. The frequency converter 4 can be fastened to the vibration arm. The contact surface between the locking part 12 and the vibration arm allows the two to be fastened, and the frequency converter 4 is not easy to move.

[0027] like Figure 3 The cross-sectional view shown in the figure can also provide the frequency converter 4 with two sets of adjusting nuts. In this case, the first connecting part 7 is changed to the sixth connecting part and the seventh connecting part. The seventh connecting part is provided on the inner side of the sixth connecting part. The center of the seventh connecting part is a through hole. The through hole is provided with a thread for passing the second adjusting nut. The second adjusting nut is fixedly connected to a second locking part at one end near the through hole 5.

[0028] At this time, the distance between the upper end 15 of the sixth connecting portion and the lower end 19 of the sixth connecting portion is greater than the height of the second locking portion 17. The inner side of the sixth connecting portion is the seventh connecting portion, the upper end 15 of the sixth connecting portion is above the upper end 16 of the seventh connecting portion, the lower end 19 of the sixth connecting portion is below the lower end 18 of the seventh connecting portion, and the second bolt portion 20 of the second adjusting nut is located between the upper end 16 and the lower end 18 of the seventh connecting portion.

[0029] The second adjustment nut includes a second locking portion 17 and a second bolt portion 20, each connected to the other. The second bolt portion 20 is threaded on its outer side and is threadedly connected to the seventh connecting portion by passing through a through hole in the center of the seventh connecting portion. One side of the second bolt portion 20 is fixedly connected to the center of the second locking portion 17, and the other side is provided with a hexagonal groove 21 for adjusting the position of the second adjustment nut using an Allen wrench (or hexagonal screwdriver).

[0030] Furthermore, when adjusting nuts are provided on both sides of the frequency converter 4, the structures on both sides are symmetrical or asymmetrical, that is, the sizes and / or positions of the two adjusting nuts are different.

[0031] The frequency-adjustable tuning fork improves the frequency converter and increases the contact surface between the adjusting nut and the fork handle. The frequency converter can be closely attached to the fork handle and is not easily moved. The utility model has a simple structure and is easy to operate.

Claims

1. A frequency-adjustable tuning fork, characterized in that: It includes a vibration arm and a fork handle, two vibration arms are provided at the top of the fork handle, and the vibration arms are provided with a frequency converter that can move up and down along the vibration arms and be fixed in the required position. The middle part of the frequency converter is provided with a through hole that is sleeved on the vibration arm, and an adjusting nut is provided on the side; the left side of the through hole is the first connecting part, the front and rear sides are respectively the second connecting part and the third connecting part, and the right side is the fourth connecting part, the inner side of the fourth connecting part is provided with a fifth connecting part, the center of the fifth connecting part is a through hole, and the through hole is provided with a thread for passing the adjusting nut, and the adjusting nut is fixedly connected with a locking part at one end close to the through hole.

2. The frequency-adjustable tuning fork according to claim 1, characterized in that: The perforation of the frequency conversion component has the same shape as the cross section of the vibration arm.

3. The frequency-adjustable tuning fork according to claim 1, characterized in that: The frequency conversion component is in the shape of a cylinder or a cuboid.

4. The frequency-adjustable tuning fork according to claim 1, characterized in that: The total length of the fifth connecting portion plus the length of the locking portion is less than the length of the fourth connecting portion.

5. The frequency-adjustable tuning fork according to claim 1, characterized in that: The locking portion has a height smaller than that of the fifth connecting portion.

6. The frequency-adjustable tuning fork according to claim 1, characterized in that: The locking portion is in a shape that can be used for tightening.

7. The frequency-adjustable tuning fork according to claim 1, characterized in that: The adjusting nut includes a locking portion and a bolt portion connected to each other. The outer side of the bolt portion is provided with a thread for passing through the through hole in the center of the fifth connecting portion and being connected to the fifth connecting portion via the thread.

8. The frequency-adjustable tuning fork according to claim 7, characterized in that: One side of the bolt portion is fixedly connected to the center of the locking portion, and the other side is provided with a hexagonal groove for adjustment by a hexagonal wrench.

9. The frequency-adjustable tuning fork according to claim 1, characterized in that: When adjusting nuts are provided on both sides of the frequency converter, the structures of the two sides are symmetrical or asymmetrical, that is, the sizes and / or positions of the two adjusting nuts are different.

10. The frequency-adjustable tuning fork according to claim 1, characterized in that: The cross section of the vibration arm is circular, triangular or rectangular.

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