Clapper arm swing mechanism and practice bell equipped with same

Abstract

To provide a clapper arm oscillation mechanism and practice bells with this that enable practicing with a feeling as close as possible to that of an actual handbell, at a much lower price than that of a handbell.SOLUTION: In a clapper arm oscillating mechanism of a practice bell, a clapper arm is fitted with both ends of a rod-shaped oscillating shaft 21S that is inserted rotatably into a through-hole 11BT that passes through a base part 11 in the width direction into a hole 13H that is provided so as to face the upper approximate center of the first arm plate 13R and the second arm plate 13L, to be able to oscillate in the circumferential direction of a virtual circle with the oscillating shaft as the center axis. The multiple swing control plates 14L and 14R each comprises a base connection part with two holes 14H, a swing control part with approximately rectangular shape, and an arm contact part, and each swing control plate is offset and arranged on the width direction outside of the first arm plate and the second arm plate, and the length of one swing control plate is shorter than the length of the other swing control plate.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a clapper arm swinging mechanism and a practice bell equipped with the same. [Background technology]

[0002] Music bells are known as bells for practicing English handbells (hereinafter referred to as "handbells") (see Non-Patent Document 1).

[0003] For example, a set of handbells with three octaves (37 bells in total) costs approximately 2.5 million yen, which is very expensive, whereas even the most expensive model of music bells can be purchased for about one-tenth the price of handbells. Also, handbells are instruments with a wide range of weights, with the high range weighing 2-300g and the low range weighing 7-8kg, making them difficult to carry around in bulk, whereas a set of 23 music bells, for example, weighs a total of 3kg, which is much lighter than handbells and makes them very easy to carry. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Bellmint Handbells, "Difference between Handbells and Music Bells" https: / / bellmint.com / handbelltype (Retrieved August 17, 2023) Summary of the Invention [Problem to be solved by the invention]

[0005] Music bells have the advantage that they are easy to play, making them easy for anyone to play. However, unlike hand bells, which have a structure that restricts the swinging direction of the clapper, music bells have a structure that allows the clapper to swing in all directions, making it physically impossible to practice playing them in a way that is unique to hand bells, such as four-in-hand.

[0006] In addition, hand bells come in a wide range of weights as mentioned above, and their sizes are also different; the high-pitched range is relatively small and the low-pitched range is relatively large, whereas music bells are made in roughly the same size and weight for all bells, from the high to the low range.

[0007] Music bells have the advantage of being easy to play and easy for children to handle due to their small size, but the fact that the size and weight of the bells differ between high and low registers is a unique feature of handbells and is an essential element in handbell practice.In this respect, music bells, which have bells of roughly the same size for almost all registers, from high to low, are not sufficient as practice tools for handbells.

[0008] Ultimately, it would be best to use handbells themselves for handbell practice, but as mentioned above, handbells are expensive, so it is not realistic for individuals to purchase such expensive handbells for practice purposes.

[0009] There are various reasons for the high price of handbells. The biggest reason is the limited number of manufacturers, primarily overseas established companies. From a supply-demand perspective, if demand exceeds supply, it is only natural that product prices will be high. In particular, there are very few suppliers of handbells. Furthermore, the castings used for handbells are made of bronze and are cast. However, after casting, artisans must manually polish the surface to produce the desired sound. If the casting finish is not satisfactory, it must be discarded, resulting in very low yields. Furthermore, the finished castings are prone to rust due to hand sweat and oils from contact with the surface, requiring the use of special gloves when playing and careful maintenance after use. These are extremely delicate components, which may also contribute to the high price of handbells. Furthermore, handbells require a complex mechanism for striking the clapper against the casting to produce the desired sound, and they contain consumable parts that wear out with repeated use. This, combined with the fact that most handbell manufacturers are long-established overseas companies, is thought to be contributing to the high cost of repairing and maintaining handbells.

[0010] Music bells are originally practice bells developed to solve the problems with hand bells mentioned above (such as their high price). However, even if they solve the above problems, they are not sufficient as bells for learning the proper hand bell playing techniques or for enabling practice with a feel as close as possible to that of real hand bells.

[0011] The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a clapper arm swinging mechanism and a practice bell equipped with the same that can be offered at a price far lower than that of a handbell and that allows practice with a feeling as close as possible to that of an actual handbell. [Means for solving the problem]

[0012] In order to solve the above problems, the clapper arm swing mechanism of the present invention is a clapper arm swing mechanism used in a practice bell that generates a striking sound by bringing a clapper into contact with a casting, and comprises a rectangular parallelepiped base portion, a clapper arm attached so as to hang down from the base portion via left and right side surfaces located in the width direction of the base portion, and a pair of swing control plates attached so as to hang down from the base portion via front and rear side surfaces located in the front-rear direction of the base portion, and the clapper arm has a substantially rectangular clapper fixing surface to which the clapper is fixed, a first arm plate and a second arm plate that are continuous with the left and right sides located in the width direction of the clapper fixing surface and extend vertically from the left and right sides, respectively, and the clapper arm is attached to the first arm plate and the The two arm plates are mounted so as to be swingable in the circumferential direction of an imaginary circle with the swing shaft as its center axis by fitting both ends of a rod-shaped swing shaft that is rotatably inserted into a through hole that passes through the base portion in the width direction into each hole portion that is provided opposite each other at approximately the center of the upper part of the arm plates, and each of the swing control plates has a substantially rectangular base connection portion that has approximately the same area as the front and rear side surfaces of the base portion, a substantially rectangular swing control portion that is continuous with the base connection portion, and an arm abutment portion that is continuous with the swing control portion, is wider than the width of the swing control portion, and includes protrusions that protrude outward from the left and right ends of the swing control portion, and each of the swing control plates is positioned offset outward in the width direction of the first arm plate and the second arm plate, respectively, and the length of one of the swing control plates is shorter than the length of the other of the swing control plates. [Effects of the Invention]

[0013] According to the present invention, a practice bell can be provided that can be offered at a price far lower than that of a handbell and that allows practice with a feeling as close as possible to that of an actual handbell. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view of a practice bell equipped with a clapper arm swinging mechanism according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a side view of a practice bell equipped with a clapper arm swinging mechanism according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is an exploded, pre-assembled view of a practice bell and clapper arm swinging mechanism according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a diagram illustrating a base portion constituting a clapper arm swing mechanism according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a diagram illustrating a clapper arm constituting a clapper arm swing mechanism according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram illustrating a swing control unit that constitutes a clapper arm swing mechanism according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a conceptual diagram of the operation of the clapper arm swing mechanism according to the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are schematic or conceptual, and the dimensions of each component, the size ratios between components, etc. are not necessarily the same as those in reality. Furthermore, even when the same components are shown, the dimensions and ratios may be different depending on the drawing. Furthermore, in the drawings attached to this specification, the shape, scale, aspect ratios, etc. of each part may be changed or exaggerated from the actual product to facilitate understanding.

[0016] Furthermore, like handbells, the practice bell 1 according to this embodiment is available in different sizes depending on the scale, and accordingly, the various components that make up the practice bell 1, which will be described later, are also available in different sizes.Unless otherwise specified in the specification, this specification will use as an example a single practice bell 1 that produces a strike sound of one scale (specifically, "C5").However, it goes without saying that the practice bell and clapper arm swinging mechanism of the present invention are not limited to the above sizes.

[0017] [About practice bells with clapper arm swinging mechanisms] The following describes a practice bell 1 according to this embodiment and a clapper arm swinging mechanism 10 used in this practice bell 1. Fig. 1 is a front view of a practice bell 1 equipped with a clapper arm swinging mechanism 10 according to an embodiment of the present disclosure. Fig. 2 is a side view of a practice bell 1 equipped with a clapper arm swinging mechanism 10 according to an embodiment of the present disclosure. Fig. 3 is an exploded view before assembly of the practice bell 1 and clapper arm swinging mechanism 10 according to an embodiment of the present disclosure.

[0018] As shown in Figures 1 and 2, the practice bell 1 of this embodiment is composed of a handle 5 for holding, a clapper arm swinging mechanism 10, a grip guard 12, a clapper 15, and a casting 16.

[0019] The handle 5 is a part that the player holds when using the practice bell 1, and has a rod-like shape with a circular cross section. The handle 5 is used by the player to shake the practice bell 1 to produce a striking sound. The handle 5 according to this embodiment has a screw hole 5 that is concentric with the outer periphery of the handle 5 from one end in the longitudinal direction to approximately the center of the handle 5 in the longitudinal direction. H (See Figure 3) and screw holes 5 H The size of the handle 5 is not particularly limited, but in the case of a handle 5 having a longitudinal length of 120 mm and a diameter of 25 mm, the diameter of the hole may be 8 mm to 10 mm (when an M8 male screw is used) and a depth of 50 mm. H is a male screw 11 provided on the base portion 11 of the clapper arm swing mechanism 10 (described later). S) and the handle 5 by screwing. Furthermore, while polypropylene (PP) is preferably used as the material for the handle 5 used in the practice bell 1 of this embodiment, the material is not limited to this, and any material can be used as long as it ensures the rigidity of the handle 5. For example, the handle 5 may be made of acrylonitrile-butadiene styrene (ABS), polyvinyl chloride (PVC), phenolic resin (Bakelite PF), etc. Note that instead of the above, a ring-shaped grip like that used in handbells may also be used as the handle 5.

[0020] The grip guard 12 is also used in handbells and is called a hand guard. The grip guard 12 is circular with a diameter of 60 mm and a thickness of 5 mm. The grip guard 12 has a hole 12 concentric with its outer circumference. H (See FIG. 3.) H is a male screw 11 provided on the shaft of the clapper arm swing mechanism 10 described later. S The grip guard 12 is provided to allow the insertion of a protective shield. The grip guard 12 is a component that protects the performer's hand from touching the casting while gripping the handle 5. In the case of handbells, the casting is made of bronze, a delicate component that can easily rust if touched by a human hand, so a grip guard (hand guard) is an essential component. However, in the present invention, brass is used as the material for the casting 16 (described below), so a grip guard is not an essential component. Furthermore, while acrylic is preferably used as the material for the grip guard 12, this is not a limitation. Other materials, such as polyethylene terephthalate (PET) and polycarbonate (PC), may be used as long as they fulfill the above-mentioned role as a grip guard.

[0021] The clapper 15 is a component attached to the tip of the clapper arm that constitutes the clapper arm swing mechanism 10, which will be described later. The clapper 15 is circular with a diameter of 45 mm and a thickness of 8 mm. The clapper 15 has two holes 15 arranged side by side on both the left and right sides of its center. H Hole 15 is provided. H The diameter of the hole is 4 mm and the hole is 15 H The pitch of holes is 12 mm. H is provided to attach the clapper 15 to the clapper arm 13 by fastening with a screw 23 and a nut 24 (see FIG. 3). The material for the clapper 15 is preferably polypropylene (PP), but is not limited to this and may be any material that can generate the desired impact sound when the clapper 15 comes into contact with the casting 16, such as acrylonitrile-butadiene styrene (ABS), polyvinyl chloride (PVC), or phenolic resin (Bakelite PF).

[0022] The casting 16 is a component that generates the desired striking sound when the clapper 15 contacts the inner wall surface of the casting 16, and is an important component that constitutes the practice bell 1. The casting 16 consists of a substantially circular upper surface, a shoulder that is continuous with the outer periphery of the upper surface and has a gently sloping surface like a ridge in all directions, and a body that is continuous with the outer periphery of the lower end of the shoulder and has a steeply sloping surface in all directions relative to the sloping surface of the shoulder. The upper surface of the casting 16 is provided with a male screw 11 of the base 11 to interpose the casting 16 between the handle 5 and grip guard 12 and the clapper arm swing mechanism 10. S Insertion hole 16 through which H(See FIG. 3 ). Brass is a suitable material for the casting 16 used in the practice bell 1 of this embodiment, due to its ease of processing and low processing costs. The purpose of the practice bell of this invention is to reproduce a striking sound similar to that of a handbell, while also reproducing the unique playing style of a handbell, all at a low cost. In light of this purpose, brass is currently considered the optimal material for the casting 16. Furthermore, the casting 16 is formed using a spinning process performed by artisans. This significantly reduces initial investment. Furthermore, castings made using the spinning process have stable quality and high strength, which contributes to increased durability. Using brass for the casting 16 significantly reduces the price of the practice bell 1. If future technological innovations lead to the development of materials that are as easy to process as or easier to process than brass, such new materials may be adopted.

[0023] The size of the casting 16, like that of a handbell, varies depending on the desired scale, so we will not go into details here, but it should be large enough to accommodate the clapper arm swinging mechanism 10, which will be described later, and to ensure a stroke that allows the stationary clapper 15 to contact the casting 16 with an appropriate force (the load applied to the clapper arm by swinging the practice bell 1) so that the desired striking sound is produced.

[0024] [About the clapper arm swing mechanism] The clapper arm swing mechanism 10 of this embodiment is a component that generates a striking sound by abutting the clapper 15 against the casting 16, and is a core component that forms the core of the practice bell 1 of this embodiment. The clapper arm swing mechanism 10 comprises a rectangular parallelepiped base 11, a clapper arm 13 attached so as to hang down from the base 11 via the left and right side surfaces located in the width direction of the base 11, and a pair of swing control plates 14 (14) attached so as to hang down from the base 11 via the front and rear side surfaces located in the front-rear direction of the base 11. R , 14 L ) (See Figure 3. As explained below, the clapper arm swing mechanism 10 has an extremely simple structure and employs a new, revolutionary mechanism that produces the desired striking sound. Furthermore, by using maintenance-free parts and relatively easily available materials, assembly and maintenance are easy, contributing to significantly reducing the price of the practice bell.

[0025] [About the base part that makes up the clapper arm swing mechanism] 4A is a front view showing a base portion 11 constituting a clapper arm swing mechanism 10 according to an embodiment of the present disclosure, and FIG. 4B is a side view thereof. The base portion 11 is a main portion 11 having a substantially rectangular parallelepiped shape. B And, Main Part 11 B From the approximate center of the top surface of the main part 11 B A continuous, approximately cylindrical portion 11 that is continuous so as to be stacked on top of one another. C And, Part 11 C A male screw 11 is provided to extend vertically from the approximate center of the upper surface of the S The main part of the base portion 11 for achieving the effects of the present invention is the base portion 11. B Therefore, the base 11 B will be described below as essentially the base portion 11 of the present invention.

[0026] Main section 11 B The main portion 11 extends from approximately the center of the left side surface to approximately the center of the right side surface in the width direction. B Through hole 11 BTThe main part 11 B The screw holes 11 are provided at approximately the center of the front and rear sides of the BH (See FIGS. 4(A) and (B)). BT Pin 21 (described later) S (swing shaft) is inserted (see Figure 3). BH The inner wall surface of the through hole 11 is formed with a female screw for fastening a swing control plate 14 (described later) by means of a screw. BT The diameter of the pin is 21 S The screw hole is set to 4.2mm, which allows insertion of a screw (diameter 4mm). BH The diameter of the base 11 may be a size that corresponds to a male screw (M3) having a diameter of 3 mm. Note that an austenitic stainless steel plate (SUS304) is preferably used as the material for the base 11, taking into consideration ease of processing and durability. As long as this is ensured, the material for the base 11 is not particularly limited, and may be, for example, an aluminum alloy or brass.

[0027] [About the clapper arm that makes up the clapper arm swing mechanism] 5(A) is a front view of the clapper arm 13 constituting the clapper arm swing mechanism 10 according to the embodiment of the present disclosure, FIG. 5(B) is a side view thereof, and FIG. 5(C) is a bottom view thereof. FIG. 5(D) shows the pin 21 which functions as a swing axis for swingably connecting the clapper arm 13 to the base part 11. S FIG.

[0028] The clapper arm 13 has a substantially rectangular clapper fixing surface 13 to which the clapper 15 is fixed. B and Clapper fixing surface 13 B a first arm plate 13 extending vertically from the left side of the first arm plate 13, which is continuous with the left side of the first arm plate 13 positioned in the width direction of the first arm plate 13; R and Clapper fixing surface 13 B A second arm plate 13 is continuous with the right side of the arm plate 13 located in the width direction of the arm plate 13 and extends vertically from the right side of the arm plate 13. L(See Fig. 5(A) and Fig. 5(B)). The clapper arm 13 preferably has a plate thickness of 1 mm.

[0029] First arm plate 13 R and the second arm plate 13 L Specifically, an insertion hole 13 having a diameter of about 4 mm is provided approximately 6 mm below the upper end of the H These insertion holes 13 are provided. H and pin 21, which will be described later. S The two ends are fitted together (see Figure 3).

[0030] Clapper fixing surface 13 B The clapper 15 is provided with two holes 13 for fixing the clapper 15 by screw fastening. BH Clapper fixing surface 13 B The two are arranged diagonally on a virtual diagonal line (see FIG. 5(C)).

[0031] Pin 21 S The base portion 11 (base portion 11 B ) through holes 11 that penetrate the interior in the width direction BT The pin 21 is a rod-shaped swing shaft that is rotatably inserted into the S The diameter of the through hole 11 is 4 mm. BT By setting the diameter of pin 21 to 4.2 mm, S Through hole 11 BT The through hole 11 can be rotatably accommodated within the through hole 11. BT Pin 21 when inserted into S The both ends of the through-hole 11 BT The first arm plate 13 projects outward by a predetermined length. R and the second arm plate 13 L Each insertion hole 13 H (Pin 21 S The clapper arm 13 and the base portion 11 can be integrally formed via the pin 21. S 21 on each end SS 2mm inward from the center, there is a 0.8mm wide, 3mm diameter groove 21 SR (See FIG. 5(D)).SR E-ring (E-type retaining ring) 21 R The E-ring 21 can be inserted or fitted. R is pin 21 S The base portion 11 (base portion 11 B ) and the clapper arm 13 does not fall off the base part 11 (base 11 B ) to be held oscillatably by the E-ring 21. R The size of each part of the groove 21 SR Specifically, an E-ring 21 having an inner diameter of at least 3 mm is preferably used. R It is preferable to use:

[0032] [About the swing control unit that makes up the clapper arm swing mechanism] FIG. 6(A) shows the swing control plate 14 constituting the clapper arm swing mechanism 10 according to the embodiment of the present disclosure. R 6(B) is a front view showing the swing control plate 14. R 6(C) is a side view showing the swing control plate 14 constituting the clapper arm swing mechanism 10. L 6(D) is a front view showing the swing control plate 14 L FIG.

[0033] Swing control plate 14 R and swing control plate 14 L is base 11 B The base connection part 14 has a substantially rectangular shape and has approximately the same area as the front and rear sides of the base part. B and base connection part 14 B A substantially rectangular swing control section 14 C and the swing control unit 14 C , and the swing control unit 14 C and the swing control section 14 C The arm abutment portion 14 includes protrusions protruding outward from the left and right ends of the arm abutment portion 14. T (See FIG. 6(A) and FIG. 6(C)). R and swing control plate 14 Lis the first arm plate 13 R and the second arm plate 13 L The swing control plates 14 can be positioned outwardly of the swing control plates 14 in the width direction, offset by 7.5 mm from each other (see FIG. 1). R and swing control plate 14 L As the material for the swing control plate 14, an austenitic stainless steel plate (SUS304) can be suitably used. R and swing control plate 14 L The reason for using SUS304 as the material for the swing control plates is that it not only ensures ease of processing and durability of each plate, but is also the most suitable material for exerting the desired elastic force or amount of deflection required to appropriately control the degree of swing of the clapper arm 13. R and swing control plate 14 L Preferably, the plates each have a thickness of 0.5 mm.

[0034] Base connection part 14 B The two holes 14 are arranged side by side in the width direction. H (See FIG. 6(A) and FIG. 6(C)). H The diameter of each hole 14 is 3 mm, and the holes 14 are arranged at a pitch of 10 mm. H The diameter of the base 11 and the pitch between the two are B Each screw hole 11 provided on the front and rear side surfaces of the base BH The diameter of the base connection portion 14 and the pitch of the base connection portion 14 are the same as those of the base connection portion 14. B The base 11 B (Base part) front and rear side holes 14 H and screw hole 11 BH and the holes 14 are stacked so that they correspond to each other. H Through, base 11 B (Base part) screw holes 11 BH Screw 22 R and screw 22 L When the base 11 is tightened, the swing control plate 14 R and swing control plate 14 L can be fixed (see Figures 1 and 3).

[0035] Swing control plate 14 R and swing control plate 14 L Austenitic stainless steel plate (SUS304) can be suitably used for the oscillation control plate 14. This is because, in addition to the purpose of ensuring ease of processing and durability as described above, by utilizing the suitable Young's modulus (elastic modulus) among the mechanical properties of SUS304, the oscillation control plate 14 can be easily formed. R and swing control plate 14 L This is for the purpose of suitably adjusting the amount of deflection of the clapper arm 13, thereby making it easier (or harder) for the clapper 15 to hit the casting 16 via the clapper arm 13.

[0036] On the other hand, the swing control plate 14 R and swing control plate 14 L The desired amount of deflection cannot be achieved by simply using SUS304 as the material for the swing control plate 14. R and swing control plate 14 L It is important that SUS304 be machined to a length, width, and thickness that will allow the shape of the bell to be realized. In addition, in order to realize a low-cost, maintenance-free practice bell 1, which is one of the objects of the present invention, it is extremely significant to use SUS304 as a material that is easy to machine (i.e., reduces processing costs), is readily available on the market, and has excellent durability, as described above.

[0037] Therefore, the inventor of the present invention has conducted extensive research and development to develop a swing control plate 14 that can achieve a desired amount of deflection. R (14 L We found that the above and following shapes (see Figure 6) can produce a striking sound similar to that of a handbell.

[0038] Swing control unit 14 C The vertical length of the swing control plate 14 R and swing control plate 14 L In this embodiment, the overall length of each of the swing control plates 14 is determined. R The swing control unit 14 C The length of the swing control plate 14 L The swing control unit 14 CWith this configuration, the length of the first arm plate 13 of the clapper arm 13 is shorter than that of the first arm plate 13 of the clapper arm 13. R and the second arm plate 13 L However, the swing control plate 14 R When the clapper arm 13 abuts against the casting 16, the clapper 15 is likely to abut against the casting 16. R and the second arm plate 13 L The swing control plate 14 L When the clapper 15 abuts against the casting 16, the clapper 15 is less likely to abut against the casting 16.

[0039] Furthermore, when the mechanical properties (Young's modulus, etc.) of SUS304 are taken into consideration, the longer the length of the oscillation control plate 14, the more easily it bends, and the shorter it is, the less easily it bends. Furthermore, the wider the width of the oscillation control plate 14, the less easily it bends, and the narrower it is, the more easily it bends. By utilizing these properties, the following effects can be achieved.

[0040] The swing control plate 14 according to this embodiment R and swing control plate 14 L The role of the clapper 15 is not limited to adjusting the amount of deflection so that the desired striking sound can be produced by the casting 16 when the clapper 15 is brought into contact with the casting 16, but also to ensuring that the clapper 15 does not come into contact with the casting 16 when there is no need to produce a striking sound.

[0041] Therefore, the swing control plate 14 according to this embodiment R and swing control plate 14 L For example, when using practice bell 1 to reproduce the tone of C5 (do), it has been found that the following size combination is optimal when compared with other sizes. <<Preferable size of the swing control plate according to this embodiment>> (1) Swing control plate 14 R Length: 40mm Base connection part 14 B Length: 15mm Base connection part 14 B Width: 18mm Swing control unit 14 C Length: 15mm Swing control unit 14 C Width: 18mm Arm contact part 14 T Length: 10mm Arm contact part 14 T Width: 30mm (2) Swing control plate 14 L Length: 35mm Swing control unit 14 C Length: 10mm *Only sizes different from (1) are listed * Clapper arm length: 75mm

[0042] By assembling the above components as described above, the clapper arm swing mechanism 10 and the practice bell 1 equipped with it according to this embodiment can be completed (see Figure 3). While some processing is required for the base 11, clapper arm 13, and swing control unit 14, these are simple processes using well-known techniques. Furthermore, the use of brass for the casting 16 significantly reduces processing costs. Furthermore, assembly of the components is primarily achieved by fastening the components with screws, eliminating costly and labor-intensive processes such as welding. This simplifies assembly and significantly reduces assembly costs. Naturally, this also contributes to the low cost of the completed practice bell 1. As a result, the price of a product incorporating the practice bell and clapper arm swing mechanism of this invention has been successfully reduced to approximately one-tenth the price of a hand bell. Furthermore, the above-described structure of the clapper arm swing mechanism 10 according to this embodiment is a novel structure not seen in swing mechanisms for handbells up to now, and is a groundbreaking structure not seen in music bells or tone chimes. Despite this novel and groundbreaking structure, the swing control plate 14 R and swing control version 14 LThe idea of ​​making it function as a spring and realizing it with an extremely small number of parts is the result of the inventor's diligent research and development, and could not have been achieved by simply assembling known technologies.

[0043] [Operation of the Clapper Arm Swing Mechanism of the Present Disclosure] 7A and 7B are conceptual diagrams illustrating the operation of the clapper arm swing mechanism according to an embodiment of the present disclosure. Fig. 7A is a conceptual diagram illustrating the clapper arm 13 in a stationary state. As shown in Fig. 7A, when the practice bell 1 is not being operated by the performer, for example, when the practice bell 1 is placed on a performance stand with the casting 16 facing downward, the clapper arm 13 can be stationary, hanging vertically from the base 11.

[0044] FIG. 7(B) shows that (1) when the practice bell 1 is swung in the direction of the arrow with a relatively weak force X, (2) the clapper arm 13 moves in the direction of the swing control plate 14. R The swing control plate 14 R does not bend, (3) so that the clapper 15 does not hit the casting 16 and no striking sound is produced.

[0045] FIG. 7(C) shows that (1) when the practice bell 1 is swung in the direction of the arrow with a relatively strong force Y, (2) the clapper arm 13 moves in the direction of the swing control plate 14. R The swing control plate 14 R (3) This causes the clapper 15 to strike the casting 16, producing a striking sound.

[0046] FIG. 7(D) shows that (1) when the practice bell 1 is swung in the direction of the arrow with a relatively weak force Z, (2) the clapper arm 13 moves in the direction of the swing control plate 14. L The swing control plate 14 L (3) Therefore, the clapper 15 does not hit the casting 16, and no striking sound is produced. L In order to prevent the clapper 15 from coming into contact with the casting 16 located on the side, the swing control plate 14 LThe length of the swing control plate 14 is as described above. R This prevents clapper 15 from hitting casting 16 even if practice bell 1 is swung in the direction of the arrow (direction indicated by force Z) with the same force (force Y) as the direction of the arrow in Figure 7(C) (2).

[0047] FIG. 7(E) shows that (1) when the practice bell 1 is swung in the direction of the arrow with a relatively strong force Z' (a force even greater than the force shown in the Y direction), (2) the clapper arm 13 moves in the direction of the swing control plate 14. L The swing control plate 14 L (3) The clapper 15 then strikes the casting 16, producing a striking sound. L As mentioned above, the role of the swing control plate 14 is to move the swing control plate 14 during normal playing. L The purpose is to prevent the clapper 15 from coming into contact with the casting 16 located on the side. L The above configuration can be used to realize special playing techniques, such as shaking, which require the clapper 5 to contact the casting 16 located on the side. The relationship between the magnitudes of the forces X, Y, Z, and Z' described above can be expressed mathematically as Equation 1 below. Force Z'>Force Z=Force Y>Force X...(Formula 1)

[0048] The above-described embodiments have been described to facilitate understanding of the present invention, and are not intended to limit the present invention. Therefore, each element disclosed in the above embodiments is intended to include all design modifications and equivalents that fall within the technical scope of the present invention.

[0049] In the above embodiment, the swing control plate 14 R and swing control plate 14 LThe above description is based on the optimal size combination for use in a practice bell 1 that reproduces the tone of C5 (do), but the optimal size can also be set for practice bells 1 that reproduce other tones so that the basic structure of the present invention is maintained. Table 1 below shows the swing control plate 14 corresponding to each tone. R and swing control plate 14 L The following table 2 lists the sizes of the castings (bell parts) of the practice bell 1 that produce each tone.

[0050] [Table 1]

[0051] The symbols shown in the upper columns have the following meanings: 15D: Clapper diameter 13L: Clapper arm length 14RL: Swing control plate 14 R Length 14BL: Base connection part 14 B Length 14BW: Base connection part 14 B Width 14CL(R): Swing control unit 14 C (Oscillation control version 14 R Side length 14CW: Swing control section 14 C Width 14LL: Swing control plate 14 L Length 14CL(L): Swing control section 14 C (Oscillation control version 14 L Side length

[0052] As can be seen from Table 1, the swing control plate 14 corresponding to each sound R and swing control plate 14 L In terms of the length relationship between the swing control plate 14 R (One of the swing control plates) swing control section 14 C The length 14CL(R) of the swing control portion 14 that constitutes the swing control plate 14L (the other swing control plate)C It is clear that the length of each swing control plate (14 R , 14 L ) is configured to be approximately 1 / 3 to approximately 2 / 3 of the length 13L of the clapper arm. R and the second arm plate 13 L However, the swing control plate 14 R When the clapper 15 abuts against the casting 16, the swing control plate 14 L When the clapper 15 abuts against the casting 16, the clapper 15 is less likely to abut against the casting 16. R and swing control plate 14 L The above configuration, in conjunction with the actions of the other components that make up the clapper arm swinging mechanism in this embodiment, not only contributes to producing each note, but also contributes to providing a practice bell that allows practicing with a feeling as close as possible to that of an actual hand bell.

[0053] [Table 2]

[0054] The symbols in the upper columns indicate the following sizes (see Figure 1). H: Casting height 16 IH: Effective height inside the casting 16 ID(N): Diameter of casting 16 (top) ID(W): Diameter of casting 16 (bottom)

[0055] Table 2 lists the sizes of the casting 16, one of the key components required to produce each note. Each casting 16 is designed to be approximately the same size as existing hand bells. It can be seen that the length of the clapper arm 13 is designed to correspond to the effective height IH of the casting 16 (see Table 1). While this correspondence may seem natural, the practice bell 1 in this embodiment is the result of extensive research by the inventors of the present invention. The clapper arm 13 was also newly developed as a key component required to produce the desired note, and its length is not simply determined. In particular, the clapper arm 13 has a U-shape when viewed from the side in the direction of its swing (see Figure 2). This configuration reduces the weight of the clapper arm 13 while increasing its strength. Furthermore, the swing range of the clapper arm 13, combined with the swing control effect of the swing control plate, is designed according to the size of the casting. In other words, the configuration of the clapper arm swinging mechanism 10, which includes the above-mentioned configuration of the clapper arm 13, not only makes it possible to produce the desired sound when the practice bell 1 is swung with the desired force, but also contributes to realizing a playing method unique to existing hand bells. [Explanation of symbols]

[0056] 1...Practice bell 5...Handle 10... Clapper arm swing mechanism 11...Base 11 BT ...Through holes 13... Clapper arm 13 R ...First arm plate 13 L ...Second arm plate 13 H …hole 14 R , 14 L ...Swing control plate 14 B …Base connection 14 C...Swing control section 14 T …Arm contact part 12...Grip Guard 15... Clapper 16...Casting 21...Pin (oscillating shaft)

Claims

1. Used for practice bells that generate a striking sound by contacting the clapper with the casting. A clapper arm swing mechanism comprising: A rectangular parallelepiped base portion; The base portion is attached to the left and right side surfaces of the base portion in the width direction thereof so as to hang down from the base portion. Attachable clapper arm and The base portion is hung down via front and rear side surfaces of the base portion. a pair of swing control plates attached to the The clapper arm includes a substantially rectangular clapper fixing surface to which the clapper is fixed, The left and right edges of the wrapper fixing surface are connected to each other in the width direction, and extend vertically from the left and right edges. a first arm plate and a second arm plate extending from the first arm plate; The clapper arm is positioned approximately at the center of the upper portion of the first arm plate and the second arm plate. The opposing holes are inserted into through holes that pass through the base in the width direction. By fitting both ends of the rod-shaped oscillating shaft that can be inserted, a virtual oscillating shaft is formed around the oscillating shaft as a central axis. It is attached so as to be swingable in the circumferential direction of the circle, Each of the swing control plates is a substantially rectangular base plate having substantially the same area as the front and rear side surfaces of the base portion. a base connection portion, a substantially rectangular swing control portion continuous with the base connection portion, and a swing control portion continuous with the swing control portion. The width of the swing control portion is wider than the width of the swing control portion, and the width of the swing control portion is wider than the width of the swing control portion. The ... an arm contact portion including a protrusion extending from the arm contact portion; The swing control plates are respectively provided on the outer sides of the first arm plate and the second arm plate in the width direction. It is offset and arranged The length of one of the swing control plates in the width direction and the direction perpendicular to the front-rear direction of the base portion is shorter than the length of the other of the swing control plates in the width direction and the direction perpendicular to the front-rear direction of the base portion. Clapper arm swing mechanism.

2. The swing control plate is mainly made of austenitic stainless steel plate. The clapper arm swing mechanism according to claim 1 .

3. The clapper arm swing mechanism according to claim 1; a handle portion provided via a screw portion extending vertically from an upper surface of the base portion; A casting provided so as to be interposed between the base portion and the handle portion. Department and a clapper attached to the clapper fixing surface of the clapper arm; A practice bell equipped with a

4. The swing control plate is mainly made of austenitic stainless steel plate.

4. The practice bell of claim 3.

5. The casting material is brass. A practice bell as claimed in claim 3 or 4.

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