Clapper arm oscillation mechanism and practice bells with this

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 swing mechanism and a practice bell equipped with the same. [Background technology]

[0002] 2. Description of the Related Art 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 three octaves (37 bells in total) of hand bells is very expensive, costing around 2.5 million yen, whereas even the most expensive model of music bells can be purchased for about one-tenth the price of hand bells. Also, hand bells are instruments with a wide range of weights, from 2-300g in the high range to 7-8kg in the low range, making them difficult to carry around in bulk, whereas a set of 23 music bells, for example, weighs only 3kg in total, which is much lighter than hand bells 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 anyone can easily play them because they are easy to make sounds with. However, unlike hand bells, which have a structure that restricts the direction of the clapper to swing in one direction, music bells have a structure in which the clapper swings in all directions, so it is physically impossible to practice playing hand bells in a way that is unique to them, such as the four-in-hand style.

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

[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 are different for high and low registers is a unique feature of handbells and an essential element of handbell practice. In this respect, music bells, where the bells are roughly the same size for almost all registers, from high to low, are not sufficient as practice equipment for handbells.

[0008] In the end, it is ultimately desirable 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 why handbells are so expensive. The biggest reason is that there are few manufacturers, and the main manufacturers are so-called long-established overseas manufacturers. From the perspective of supply and demand balance, it is only natural that the price of a product will be high if the demand is higher than the supply, and in the case of handbells, there are overwhelmingly few suppliers. In addition, the castings used for handbells are made of bronze and are cast, but after casting, a process is required in which the surface is polished by hand by a craftsman to produce the desired striking sound, and if the finish after casting is not satisfactory, the yield is very low and the castings must be discarded, and the completed castings rust quickly due to the adhesion of hand sweat and oil when touched by human hands, so special gloves must be worn when playing and careful maintenance after use are required. These are also reasons why handbells are so expensive. Furthermore, handbells have a complex mechanism for hitting the casting with a clapper to produce the desired sound, and have consumable parts that wear out after multiple uses. This, combined with the fact that most handbell manufacturers are long-established overseas manufacturers, is thought to be what makes the cost of repairing and maintaining handbells so high.

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

[0011] The present invention has been made in consideration of the above-mentioned situation, and has as its object to provide a clapper arm swinging mechanism and a practice bell equipped with the same which can be offered at a price far lower than the price of a handbell and which enables 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 provided with a first arm plate and a second arm plate that are connected to the first arm plate and the The two arm plates are attached 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 which is rotatably inserted into a through hole which penetrates the base portion in the width direction into each hole provided opposite each other at approximately the center of the upper part of the two arm plates, and each of the swing control plates has a substantially rectangular base connection portion having approximately the same area as the front and rear side surfaces of the base portion, a substantially rectangular swing control portion which is continuous with the base connection portion, and an arm abutment portion which is continuous with the swing control portion, is wider than the width of the swing control portion, and includes protrusions which protrude outward from the left and right ends of the swing control portion, and each of the swing control plates is offset outward in the width direction of the first arm plate and the second arm plate, and the length of one of the swing control plates is shorter than the length of the other of the swing control plates. Effect of the Invention

[0013] According to the present invention, a practice bell can be provided which can be offered at a price far lower than that of a handbell and which allows practice with a feeling as close as possible to that of an actual handbell. [Brief description 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. [Diagram 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. [Diagram 3] FIG. 3 is a pre-assembly exploded 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 that constitutes the clapper arm swing mechanism according to an embodiment of the present disclosure. [Diagram 5] FIG. 5 is a diagram showing 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 PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The drawings are schematic or conceptual, and the dimensions of each component, the size ratio between components, etc. are not necessarily the same as those in reality. Even when the same components are shown, the dimensions and ratios between components may be different depending on the drawing. In addition, in the drawings attached to this specification, the shape, scale, aspect ratio, etc. of each part may be changed or exaggerated from the actual ones in order to make it easier to understand.

[0016] Furthermore, like hand bells, the practice bell 1 according to this embodiment is available in different sizes depending on the scale, and therefore the various components that make up the practice bell 1 (described below) are also available in different sizes, and in this specification, unless otherwise specified, a single practice bell 1 that produces a strike sound of one scale (specifically, "C5") will be used as an example for explanation. 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 practice bell 1 according to this embodiment and the clapper arm swinging mechanism 10 used in this practice bell 1 will be described below. Fig. 1 is a front view of the practice bell 1 equipped with the clapper arm swinging mechanism 10 according to an embodiment of the present disclosure. Fig. 2 is a side view of the practice bell 1 equipped with the 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 the 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] Handle 5 is a part that is held by the player when using practice bell 1, and has a rod-like shape with a circular cross section. Handle 5 is used by the player to shake practice bell 1 to produce a striking sound. Handle 5 according to this embodiment has screw holes 5 that are concentric with the outer periphery of handle 5 from one end in the longitudinal direction to approximately the center of handle 5 in the longitudinal direction. H (See Figure 3) and 5 screw holes. H A female screw is formed on the inner peripheral wall surface of the handle 5. 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 The male screw 11 is provided on the base portion 11 of the clapper arm swing mechanism 10 described later. S) and the handle 5 by screw fastening. Although the material for the handle 5 used in the practice bell 1 of this embodiment is preferably polypropylene (PP), the material is not limited to this and any material can be used as long as it can ensure the rigidity of the handle 5. For example, the material for the handle 5 may be acrylonitrile-butadiene styrene (ABS), polyvinyl chloride (PVC), phenolic resin (Bakelite PF), etc. Note that instead of the above, a ring-shaped grip such as that used for hand bells may 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 the handle 5. The grip guard 12 is a part that protects the player's hand from touching the casting when gripping the handle 5. In the case of handbells, the casting is made of bronze, and the casting is a delicate part that can rust at the places where it is touched by a human hand, so the grip guard (hand guard) is an essential component. However, in the present invention, brass is used as the material for the casting 16 described later, so the grip guard is not an essential component. In addition, the grip guard 12 is preferably made of acrylic, but is not limited to this, and other materials may be used as long as it can fulfill the above-mentioned role as a grip guard, such as polyethylene terephthalate (PET) and polycarbonate (PC).

[0021] The clapper 15 is a part attached to the tip of a clapper arm that constitutes the clapper arm swing mechanism 10 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 from the 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 for attaching 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 any material that can generate the desired impact sound when the clapper 15 comes into contact with the casting 16 may be used, such as acrylonitrile-butadiene styrene (ABS), polyvinyl chloride (PVC), or phenolic resin (Bakelite PF).

[0022] The casting 16 is a part for generating the desired striking sound when the clapper 15 contacts the inner wall surface of the casting 16, and is an important part of the practice bell 1. The casting 16 consists of a substantially circular upper surface, a shoulder portion that is continuous with the outer periphery of the upper surface and has a gentle sloping surface like a ridge in all directions, and a body portion that is continuous with the outer periphery of the lower end of the shoulder portion and has a steeper sloping surface in all directions relative to the sloping surface of the shoulder portion. The upper surface of the casting 16 is provided with male threads 11 of the base portion 11 to interpose the casting 16 between the handle 5 and grip guard 12 and the clapper arm swinging mechanism 10. S Through hole 16 through which His formed (see FIG. 3). As the material for the casting 16 used in the practice bell 1 according to this embodiment, brass can be suitably used from the viewpoint of ease of processing and reduction of processing costs. The purpose of the existence of the practice bell according to this invention is to reproduce the striking sound similar to that of a hand bell, to reproduce the playing method unique to hand bells, and to realize this at a low price. In view of this purpose, brass is considered to be the most suitable material for the casting 16 at the present time. In addition, for the molding process of the casting 16, a spinning process by a craftsman was adopted. This makes it possible to significantly reduce the initial investment. In addition, since the casting made by the spinning process has stable quality and high strength, it can contribute to increasing durability. By using brass as the material for the casting 16, the price of the practice bell 1 can be significantly reduced. Note that if a material that is as easy to process as brass or easier to process is developed in future technological innovations, such a new material may be adopted.

[0023] As with hand bells, the size of the casting 16 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 as to produce the desired striking sound.

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

[0025] [About the base part that constitutes the clapper arm swing mechanism] Fig. 4(A) 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. 4(B) is a side view thereof. The base portion 11 is a substantially rectangular parallelepiped main portion 11 B And, Main Part 11 B Approximately from the center of the upper surface of the main part 11 B A continuous part 11 having a substantially cylindrical shape that can be stacked on top of each other C And, Part 11 C A male screw 11 is provided so as to extend vertically from approximately the center of the upper surface of the S The main part of the base portion 11 for achieving the effect 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 is provided with 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, which will be described later, S (Pivot shaft) is inserted (see Fig. 3). BH The inner wall surface of the through hole 11 is formed with a female screw for attaching a swing control plate 14, which will be described later, by screw fastening. BT The diameter of the pin is 21 S The diameter is set to 4.2 mm, which allows the insertion of a 4 mm screw hole. 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, as the material for the base 11, an austenitic stainless steel plate (SUS304) is preferably used, 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, brass, etc.

[0027] [About the clapper arm that constitutes the clapper arm swing mechanism] Fig. 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 shaft 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 is continuous with the left side located in the width direction of the R and Clapper fixing surface 13 B A second arm plate 13 is continuous with the right side of the plate 13 in the width direction and extends vertically from the right side. L(See Fig. 5(A) and Fig. 5(B)). The clapper arm 13 may preferably have a plate thickness of 1 mm.

[0029] First arm plate 13 R and the second arm plate 13 L Approximately at the center of the upper portion of the H The insertion holes 13 are provided respectively. H 21, which will be described later. S Both 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] Pin21 S The base portion 11 (base portion 11 B ) through hole 11 in the width direction BT The pin 21 is a rod-shaped pivot shaft that is rotatably inserted into the S The diameter of the through hole 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 two ends of the BT This allows the first arm plate 13 to protrude outward by a predetermined length. R and the second arm plate 13 L Each of the insertion holes 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 2 mm inward from the center, there is a groove 21 with a width of 0.8 mm and a diameter of 3 mm. SR (See FIG. 5(D)).SR E-ring (E-shaped retaining ring) 21 R The E-ring 21 may 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 portion 11 (base portion 11 B The E-ring 21 functions as a retainer so that the E-ring 21 can be held in a swingable manner. R The size of each part of the groove 21 is as follows: 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 constitutes the clapper arm swing mechanism] FIG. 6(A) shows a swing control plate 14 constituting the clapper arm swing mechanism 10 according to the embodiment of the present disclosure. R FIG. 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 FIG. 6(D) is a front view showing the swing control plate 14. L FIG.

[0033] Swing control plate 14 R and the swing control plate 14 L 11 B A substantially rectangular base connection portion 14 having substantially the same area as the front and rear sides of the base portion B and the base connection part 14 B A substantially rectangular swing control section 14 C and the swing control unit 14 C swivel 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 the swing control plate 14 L13 is the first arm plate R and the second arm plate 13 L The swing control plate 14 can be disposed on the outer side of the swing control plate 14 in the width direction, offset by 7.5 mm from the outer side of the swing control plate 14 (see FIG. 1). R and the swing control plate 14 L The material of the swing control plate 14 is preferably an austenitic stainless steel plate (SUS304). R and the swing control plate 14 L The reason why SUS304 is used as the material for the swing control plates is that it ensures ease of processing and durability of each swing control plate, and is the most suitable material for exerting the desired elastic force or amount of deflection to appropriately control the degree of swing of the clapper arm 13. R and the swing control plate 14 L Preferably, each of the plates has a thickness of 0.5 mm.

[0034] Base connection part 14 B The plate has two holes 14 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 is provided on the front and rear sides of the base portion. 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 Base 11 B (Base part) front and rear side holes 14 H and screw hole 11 BH Stack them so that each hole corresponds to 14. H Through, base 11 B (Base part) Screw holes 11 BH Screw 22 R and 22 screws L When the base portion 11 is fastened, the swing control plate 14 is attached to the base portion 11. R and the swing control plate 14 L can be fixed (see Figures 1 and 3).

[0035] Swing control plate 14 R and the swing control plate 14 L For the oscillation control plate 14, an austenitic stainless steel plate (SUS304) can be preferably used. This is because, in addition to the purpose of ensuring ease of processing and durability as described above, the mechanical properties of SUS304, which have a suitable Young's modulus (elastic modulus), can be utilized to reduce the vibration of the oscillation control plate 14. R and the swing control plate 14 L This is for the purpose of suitably adjusting the amount of deflection, thereby making it easier (or more difficult) to achieve a suitable contact between the clapper 15 and the casting 16 via the clapper arm 13.

[0036] On the other hand, the swing control plate 14 R and the 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 the 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 practice bell 1 that is low-cost and maintenance-free, which is one of the objects of the present invention, as described above, 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.

[0037] Therefore, the inventors of the present invention have conducted extensive research and development to develop a swing control plate 14 capable of realizing 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 the 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 15 abuts against the casting 16, the first arm plate 13 of the clapper arm 13 is easily abutted against the casting 16. R and the second arm plate 13 L Swing control plate 14 L When the clapper 15 abuts against the casting 16 on the side, 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 easier it is to bend, and the shorter it is, the harder it is to bend. The wider the width of the oscillation control plate 14, the harder it is to bend, and the narrower it is, the easier it is to bend. By utilizing these properties, the following effects can be achieved.

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

[0041] Therefore, the swing control plate 14 according to this embodiment R and the swing control plate 14 L For example, when using a practice bell 1 to reproduce the tone of C5 (do), it has become clear through comparison with other sizes that the following size combination is optimal. <<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] The clapper arm swing mechanism 10 and the practice bell 1 equipped with the mechanism according to this embodiment can be completed by assembling the above-mentioned parts as described above (see FIG. 3). Although the base 11, clapper arm 13, and swing control section 14 of the above-mentioned parts require some processing, the processing method is a simple method using well-known techniques, and by using brass as the material for the casting 16, the processing costs can be significantly reduced. Furthermore, the assembly of each part is basically done by screw fastening, and no costly and laborious manufacturing methods such as welding are used, so the assembly is simple and the assembly costs can be significantly reduced. This is naturally the basis for realizing the practice bell 1 as a finished product at a low price. As a result, the price of the product using the practice bell and clapper arm swing mechanism of the present invention has been successfully reduced to about 1 / 10 of the price of a hand bell. In addition, the above-mentioned structure of the clapper arm rocking mechanism 10 according to this embodiment is a new structure not seen in rocking mechanisms for handbells up to now, and is, of course, a groundbreaking structure not seen in music bells or tone chimes. Despite being such a new and groundbreaking structure, the rocking control plate 14 R and swing control version 14 LThe idea of ​​making it function as a spring and realizing this with an extremely small number of parts is the result of the inventors' diligent research and development, and could not have been achieved by simply piecing together known technologies.

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

[0044] FIG. 7B 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 abuts against R does not bend, (3) so that the clapper 15 does not hit the casting 16 and no striking sound is produced.

[0045] FIG. 7C 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 force of the swing control plate 14 R (3) bends, causing 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 abuts against 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 contacting 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 makes it possible to prevent the clapper 15 from hitting the casting 16 even if the practice bell 1 is swung in the direction of the arrow (direction indicated by force Z) with the same force (force Y) as that shown by the arrow in (2) of Figure 7(C).

[0047] FIG. 7(E) shows that when (1) 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 force of the swing control plate 14 L (3) The clapper 15 hits the casting 16, producing a striking sound. L As described above, the role of the rocking control plate 14 is to move the rocking control plate 14 during normal playing. L The purpose of this is to prevent the clapper 15 from coming into contact with the casting 16 located on the side of the clapper. L The above configuration can be adopted to realize special playing techniques such as shaking, which require the clapper 5 to come into contact with the casting 16 located on the side. The relationship between the magnitudes of the above-mentioned forces X, Y, Z, and Z' can be expressed mathematically as shown in the following formula 1. Force Z'>Force Z=Force Y>Force X...(Formula 1)

[0048] The above-described embodiments are described for the purpose of facilitating understanding of the present invention, and are not described for the purpose of limiting the present invention. Therefore, each element disclosed in the above embodiment 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 the swing control plate 14 LThe size of the swing control plate 14 corresponding to each note is shown in Table 1 below. R and the swing control plate 14 L The following table 2 shows the sizes of each casting (bell part) of the practice bell 1 that produces each tone.

[0050] [Table 1]

[0051] The symbols 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 section 14 C (Swing 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 (Swing control version 14 L Side length

[0052] As is clear 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 with 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 The length (14RL, 14LL) of the first arm plate 13 of the clapper arm 13 is set to about 1 / 3 to about 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 the 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 practice with a feel as close as possible to that of an actual hand bell.

[0053] [Table 2]

[0054] The symbols in each column at the top indicate the following sizes (see Figure 1). H: Height of casting 16 IH: Effective inner height of casting 16 ID(N): Diameter of casting 16 (top) ID(W): Diameter of casting 16 (bottom)

[0055] Table 2 shows the size of the casting 16, which is one of the main parts for playing each sound. The size of each casting 16 is designed to be approximately the same as that of existing hand bells. It can be seen that the length of the clapper arm 13 is designed to correspond to the size of the effective height IH of the casting 16 (see Table 1). The above correspondence is understood to be natural in a sense, but the practice bell 1 in this embodiment is the result of the inventor's intensive research, and the clapper arm 13 was also newly developed as a main part for playing the desired sound, and its length was not simply determined. In particular, the clapper arm 13 is configured in a U-shape when viewed from the side in the swing direction (see Figure 2), and this configuration reduces the weight of the clapper arm 13 and increases its strength. In addition, the swing range of the clapper arm 13 is designed according to the size of the casting, in conjunction with the swing control action of the swing control plate described above. In other words, the configuration of the clapper arm swinging mechanism 10, including 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 shaken with the desired force, but also contributes to the realization of a playing method unique to existing hand bells. [Explanation of symbols]

[0056] 1...Practice bell 5…Handle 10...Clapper arm swing mechanism 11...Base section 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. A clapper arm swing mechanism used in a practice bell that generates a striking sound by contacting a clapper with a casting, 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 a width direction of the base portion; 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, the clapper arm has a substantially rectangular clapper fixing surface to which a clapper is fixed, a first arm plate and a second arm plate that are continuous with left and right sides located in a width direction of the clapper fixing surface and extend vertically from the left and right sides, respectively; the clapper arm is attached to be swingable in a circumferential direction of a virtual circle having the swing shaft as a center axis by fitting both ends of a rod-shaped swing shaft rotatably inserted into a through hole passing through the base in a width direction into respective hole portions provided in opposed positions at approximately the center of the upper portions of the first arm plate and the second arm plate, each of the swing control plates has a substantially rectangular base connection portion having substantially the same area as the front and rear side surfaces of the base portion, a substantially rectangular swing control portion continuous with the base connection portion, and an arm abutment portion continuous with the swing control portion, having a width greater than the width of the swing control portion, and including protrusions protruding outward from the left and right ends of the swing control portion, The swing control plates are offset outwardly of the first arm plate and the second arm plate in the width direction, The length of one of the swing control plates is shorter than the length of the other of the swing control plates. 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 a lower surface of the base portion; a casting portion provided between the base portion and the handle portion; 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 according to claim 3.

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

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