Disaster prevention radio

Abstract

To provide a disaster prevention radio having a manual power generation device and capable of being accommodated in a bottle holder with good fit.SOLUTION: A disaster prevention radio includes a main body having a substantially cylindrical shape and a substantially disc-shaped pedestal. The main body has a first central axis line extending a vertical axis. The pedestal is located below the main body, and includes a first upper main surface and a first lower main surface. The first central axis line passes a center of the pedestal in view of a vertical direction. The main body contains: a radio receiving apparatus; and a power generation device that can supply power to the radio receiving apparatus by rotating a rotor. The pedestal is connected to the rotor so as to be rotatable relative to the main body about the vertical axis, and has an external dimension approximating a 500 ml drinking plastic bottle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a disaster prevention radio that can be used even when an external power source or the like is lost. [Background technology]

[0002] There are technologies that enable radio broadcast reception even in situations where commercial power is out or batteries are unavailable, etc. For example, Patent Document 1 discloses a manually operated rectangular parallelepiped radio receiver with a power generator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-75344 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, radio receivers (hereinafter referred to as "disaster prevention radios") that can be used even when an external power source is lost are required to be equipped with a power generator capable of supplying power to the radio receiving unit included in the radio receiver, as well as be highly portable, taking evacuation procedures into consideration. On the other hand, linear shapes facilitate the appropriate placement of electronic components and batteries, making it easier to create functional devices, and also simplify the manufacturing process, resulting in higher production efficiency than curved housings. For these reasons, many conventional disaster prevention radios are rectangular. Traditional rectangular disaster prevention radios are not necessarily highly portable, considering the space they take up when carried in a backpack and the hassle of taking them in and out of the backpack.

[0005] Nowadays, many backpacks and bags equipped with PET bottle holders are in widespread use. PET bottle holders offer excellent portability, allowing users to easily carry beverages. The inventor therefore came up with the idea of ​​making a disaster prevention radio storable in a PET bottle holder, thereby improving the portability of the radio. The object of the present invention is to provide a disaster prevention radio that is equipped with a manual generator that can supply power to the radio receiver and that can be stored comfortably in a PET bottle holder. [Means for solving the problem]

[0006] The disaster prevention radio of the present invention has a main body having an approximately cylindrical shape and a base having an approximately disk shape, the main body having a first central axis extending along an up-down axis, the base being located below the main body and having a first upper main surface and a first lower main surface, the first central axis passing through the center of the base when viewed from the up-down direction, the main body including a radio receiving device and a power generating device capable of supplying power to the radio receiving device by rotating a rotor, the base being connected to the rotor so that it can rotate relative to the main body around the up-down axis and having external dimensions similar to a 500ml PET drinking bottle. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a disaster prevention radio that is equipped with a manual power generator that can supply power to a radio receiving device and that can be stored comfortably in a plastic bottle holder. [Brief explanation of the drawings]

[0008] [Figure 1] Figure 1 shows the disaster prevention radio viewed from the front right and diagonally above. [Figure 2] Figure 2 shows the disaster prevention radio viewed from the upper left rear diagonally. [Figure 3] Figure 3 shows the disaster prevention radio from the lower left diagonal front. [Figure 4] FIG. 4 is a view of the inside of the main body as seen from the upper left rear. [Figure 5]FIG. 5 is a view of the second member as seen from the right front diagonally below. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a view of the base as seen from diagonally above the front right. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7, illustrating a process of removing the operating arm stored in the base from the base. [Figure 9] FIG. 9 shows a disaster prevention radio stored in a plastic bottle holder provided in a backpack. DETAILED DESCRIPTION OF THE INVENTION

[0009] The structure of a disaster prevention radio 100 according to one embodiment of the present invention will be described below with reference to the drawings. First, the external structure of a main body 1 of the disaster prevention radio 100 will be described mainly with reference to Figs. 1 to 3.

[0010] As shown in FIG. 1 , the direction in which the first member 10 of the main body 1 extends is defined as the up-down direction. The direction in which the base 2 is located relative to the first member 10 is defined as down, and the opposite direction is defined as up. When viewing the main body 1 from above, the direction in which the operation panel 3 is located is defined as front, and the opposite direction is defined as rear. When viewing the main body 1 from the front, the left hand is defined as left, and the right hand is defined as right. The up-down direction, left-right direction, and front-back direction are perpendicular to each other. Note that the up-down direction, left-right direction, and front-back direction are defined for the sake of convenience. Therefore, the up-down direction, left-right direction, and front-back direction do not have to coincide with the up-down direction, left-right direction, and front-back direction when the disaster prevention radio 100 is in use. Furthermore, the up-down direction and the down-down direction may be interchanged, the left-right direction may be interchanged, and the front-back direction may be interchanged.

[0011] As shown in Figures 1 to 3, the external dimensions of the disaster prevention radio 100 are similar to those of a 500ml PET drink bottle. Specifically, the external diameter of the disaster prevention radio 100 is preferably 7.0cm or less. The external diameter of the disaster prevention radio 100 is more preferably 6.0 to 7.0cm. The vertical length of the disaster prevention radio 100 is preferably 21.0cm or less. The vertical length of the disaster prevention radio 100 is more preferably 20.0 to 21.0cm.

[0012] As shown in Figures 1 to 3, the disaster prevention radio 100 has a main body 1 and a base 2. As shown in Figures 1 to 3, the main body 1 has a generally cylindrical shape extending in the vertical direction with a rounded outer periphery. The main body 1 has a first central axis Ax1 extending along the vertical axis. More specifically, the main body 1 is formed of a first member 10 and a second member 12. The first member 10 and the second member 12 are aligned in this order from top to bottom along the first central axis Ax1. The lower end of the first member 10 is joined to the upper end of the second member 12. The first member 10 has a cylindrical shape. The first member 10 has an outer peripheral surface 10a and an inner peripheral surface. The upper end is covered by an upper end surface 10c. The upper end surface 10c is perpendicular to the first central axis Ax1. The lower end is open.

[0013] 1 to 3, an operation panel 3, a passive radiator grill 40, and a speaker grill 42 are provided on the outer peripheral surface 10a of the first member 10. The operation panel 3 is provided in the front part of the outer peripheral surface 10a. The passive radiator grill 40 and the speaker grill 42 are provided in the rear part of the outer peripheral surface 10a.

[0014] 1 and 3, the operation panel 3 has a rectangular shape with long sides extending vertically when viewed from the front. The operation panel 3 includes a hook 31, a power button 32, a play button 33, an operation button set 34, a function button set 35, an external output terminal block 36, and a USB (Universal Serial Bus) port 37. The hook 31, the power button 32, the play button 33, the operation button set 34, the function button set 35, the external output terminal block 36, and the USB port 37 are arranged in this order from top to bottom in the center of the left-right direction of the operation panel 3.

[0015] The hook 31 is located at the upper end of the operation panel 3. The hook 31 protrudes forward. When viewed from above and below, the hook 31 has a hollow, generally rectangular shape. A strap can be attached to the hook 31.

[0016] The power button 32 has a circular shape when viewed from the front, and the play button 33 has a generally rectangular shape with long sides extending in the left-right direction when viewed from the front.

[0017] The operation button set 34 includes a "+" button 341, a "-" button 342, a "<" button 343, and a ">" button 344. The "+" button 341, the "-" button 342, the "<" button 343, and the ">" button 344 are arranged so as to form the vertices of a substantially square when viewed from the front. The "+" button 341 and the "-" button 342 are spaced apart vertically. The "<" button 343 and the ">" button 344 are spaced apart horizontally. Pressing the "+" button 341 increases the audio output. Pressing the "-" button 342 decreases the audio output. Pressing the "<" button 343 decreases the radio reception frequency. Pressing the ">" button 344 increases the radio reception frequency.

[0018] The function button set 35 includes an illumination button 351 and a memory button 352. The illumination button 351 and the memory button 352 are arranged side by side, spaced apart from each other on the left and right. When the illumination button 351 is pressed, the illumination ring 48, which will be described later, lights up or goes out. The memory button 352 has a function of storing the frequency of a radio station, etc.

[0019] The external output terminal block 36 has a generally rectangular shape with its long sides extending vertically when viewed from the front. The external output terminal block 36 is covered with a rubber cover. The external output terminal block 36 is equipped with a micro-B type USB port (not shown) and a headphone jack (not shown).

[0020] The USB port 37 is a C-type USB port. The disaster prevention radio 100 is connected to an external power source (not shown) via the USB port 37. The battery 50, which will be described later, is charged by the external power source.

[0021] As shown in Fig. 2, the passive radiator grille 40 and the speaker grille 42 are arranged in this order from top to bottom. When viewed from the front-to-rear direction, the passive radiator grille 40 overlaps with a passive radiator 52, which will be described later. When viewed from the front-to-rear direction, the speaker grille 42 overlaps with a speaker 54, which will be described later. When viewed from the rear, the passive radiator grille 40 and the speaker grille 42 each have a substantially circular shape. Inside the substantially circular shape of the passive radiator grille 40 and the speaker grille 42, a plurality of holes are provided that penetrate from the outer peripheral surface 10a to the inner peripheral surface of the first member 10.

[0022] As shown in Figures 1 and 2, a display panel 44 and a rod antenna 46 are provided on the upper end surface 10c of the first member 10. The display panel 44 has a substantially rectangular shape when viewed from above. The display panel 44 displays the time, the frequency of the radio station being received by the disaster prevention radio 100, and the like. The rod antenna 46 extends and retracts in the vertical direction.

[0023] Next, the internal structure of the main body 1 will be described mainly with reference to Figures 4 to 6. As shown in Figure 4, the first member 10 is provided with a display panel control unit 440, an operation panel control unit 30, a battery 50, a passive radiator 52, a speaker 54, a power generation device 6, and a speed increasing device 7 inside.

[0024] 4, the display panel control unit 440 is located below the display panel 44. The display panel control unit 440 has a control board (not shown). The display panel control unit 440 controls the display panel 44.

[0025] 4, the operation panel control unit 30 is located behind the operation panel 3. The operation panel control unit 30 has a radio receiving device 30a. The operation panel control unit 30 controls the disaster prevention radio 100 in response to operations on the operation panel 3 by the operator.

[0026] As shown in Fig. 4, the passive radiator 52 is located behind the operation panel control unit 30, with the battery 50 sandwiched between them. In other words, the operation panel control unit 30, the battery 50, and the passive radiator 52 are lined up from front to back in this order. The passive radiator 52 has a flat, generally cylindrical shape with its axis in the front-to-rear direction. Amplified low-frequency sound is output from the passive radiator 52.

[0027] The speaker 54 is located below the passive radiator 52. The passive radiator 52 and the speaker 54 are located next to each other, one above the other. The speaker 54 includes a Bluetooth (registered trademark) module BM1 (not shown). The speaker 54 is paired with a smartphone or the like that includes a Bluetooth module BM2 (not shown). Audio data received by the Bluetooth module BM1 from the Bluetooth module BM2 is output as audio from the speaker 54. More specifically, as shown in FIG. 4, the speaker 54 includes a speaker main body 541 and an electromagnetic circuit unit 542. The electromagnetic circuit unit 542 converts the audio data into vibrations and transmits them to the speaker main body 541.

[0028] As shown in FIG. 4, the battery 50 includes a first battery 50a and a second battery 50b. The first battery 50a and the second battery 50b have a rectangular parallelepiped shape with long sides in the vertical direction. The first battery 50a and the second battery 50b have the same shape. The first battery 50a and the second battery 50b are arranged in this order from front to back. The battery 50 is, for example, a lithium-ion battery. The battery 50 is charged by an external power source via the USB port 37 or by the power generation device 6, which will be described later.

[0029] As shown in Figures 4 and 6, the power generation device 6 has a generator body 60 and a generator board 62. The generator body 60 and the generator board 62 are arranged vertically in this order. The generator body 60 has a cylindrical shape with a third central axis Ax3 extending along the vertical axis, and the upper and lower ends are covered. The generator board 62 is a plate-like member and has a substantially rectangular shape when viewed from the vertical direction.

[0030] As shown in FIG. 6, the generator body 60 includes a rotor 60a and a stator 60b. The stator 60b is provided along the inner circumferential surface of the generator body 60. The stator 60b is, for example, a permanent magnet. The rotor 60a is supported by the generator body 60 so as to rotate about a third central axis Ax3. The rotor 60a includes a coil 60ac on its outer periphery. The power generating device 6 can generate electricity by rotating the rotor 60a.

[0031] The lower end of the rotor 60a protrudes downward from the generator body 60. A drive gear 64 is attached to the lower end of the rotor 60a via a generator base plate 62. The drive gear 64 is a spur gear.

[0032] The speed-increasing device 7 transmits the rotation of the main shaft 8 (described later) to the drive gear 64. The speed-increasing device 7 increases the rotation speed of the main shaft 8. Specifically, as shown in FIGS. 4 to 6 , the speed-increasing device 7 has an intermediate gear 70 and a rotary gear 72. The intermediate gear 70 is formed by integrally molding a large-diameter gear 70a and a small-diameter gear 70b on the top and bottom. The large-diameter gear 70a and the small-diameter gear 70b are spur gears. The intermediate gear 70 is supported by the generator base plate 62 and the second member 12 so as to rotate about a fourth central axis Ax4 extending along the vertical axis. More specifically, the upper end of the large-diameter gear 70a is supported by the generator base plate 62. The lower end of the small-diameter gear 70b is supported by the second member 12. The large-diameter gear 70a meshes with the drive gear 64. The rotary gear 72 is a spur gear. The rotary gear 72 meshes with the small-diameter gear 70b. The rotary gear 72 has two mounting claws 72a. The two mounting claws 72a protrude downward from the lower main surface of the rotary gear 72. The two mounting claws 72a are positioned opposite each other on a circumference having a diameter substantially equal to the diameter of a rotary gear mounting portion 80, which will be described later.

[0033] As shown in Figures 1, 2, 5, and 6, the second member 12 has a base 120 and a protruding portion 122. The base 120 is bowl-shaped. The base 120 has an outer peripheral surface 120a and an inner peripheral surface 120b. When viewed from above, the base 120 has a substantially circular opening formed by the inner peripheral surface 120b and a substantially circular outer edge formed by the outer peripheral surface 120a. The protruding portion 122 protrudes downward from the center of the lower end of the base 120 in a substantially truncated cone shape. When viewed from below, the lower end of the protruding portion 122 has a circular lower main surface 122a.

[0034] 5 and 6, the second member 12 includes an illumination ring 48, a main shaft 8, a first bearing 86, and a second bearing 88. The illumination ring 48 is provided on a lower part of the outer peripheral surface 120a of the base 120. The illumination ring 48 has an annular shape centered on the first central axis Ax1.

[0035] The upper end of the main shaft 8 is connected to the speed increasing device 7. The main shaft 8 is supported by the second member 12 so as to rotate around the first central axis Ax1. More specifically, the main shaft 8 includes a rotary gear mounting portion 80, a main shaft body 82, and a fitting protrusion 84.

[0036] The rotary gear mounting portion 80 is provided at the upper end of the main shaft 8. The rotary gear mounting portion 80 has a generally cylindrical shape extending in the vertical direction. The rotary gear mounting portion 80 is connected to the rotary gear 72. Specifically, the rotary gear mounting portion 80 has two mounting grooves 80a. The two mounting grooves 80a are located opposite each other on the upper outer circumferential surface of the rotary gear mounting portion 80. The two mounting grooves 80a are fitted into two mounting claws 72a of the rotary gear 72, respectively.

[0037] The spindle body 82 is a rod-shaped member extending in the vertical direction. The diameter of the spindle body 82 is smaller than the diameter of the rotary gear mounting portion 80. The spindle body 82 is attached to the second member 12 by a first bearing 86 and a second bearing 88. More specifically, the upper part of the spindle body 82 is fitted into the first bearing 86. The first bearing 86 is provided at the upper end of the base portion 120 so that the spindle body 82 rotates around the first central axis Ax1. The lower part of the spindle body 82 is fitted into the second bearing 88. The second bearing 88 is provided inside the protrusion 122 so that the spindle body 82 rotates around the first central axis Ax1.

[0038] As shown in Figures 5 and 6, mating protrusion 84 is provided at the lower end of spindle 8. Mating protrusion 84 protrudes downward from lower main surface 122a of protrusion 122. Mating protrusion 84 has two parallel mating surfaces 84a along the vertical axis with respect to spindle body 82. The two parallel mating surfaces 84a are perpendicular to the horizontal axis.

[0039] Next, the structure of the base 2 of the disaster prevention radio 100 will be described mainly with reference to Figures 1 to 3 and 7. As shown in Figures 1 to 3, the base 2 is located below the main body 1. The base 2 supports the main body 1. The base 2 has a generally disk-like shape. The outer diameter of the base 2 is generally equal to the outer diameter of the main body 1. The first central axis Ax1 passes through the center of the circle that forms the outer edge of the base 2 when viewed from the top-bottom direction. This makes the disaster prevention radio 100 compact.

[0040] More specifically, the pedestal 2 has a pedestal base 20 and a pedestal protrusion 22. The pedestal base 20 has a generally disk-like shape with a rounded outer periphery. In other words, the pedestal base 20 has a generally flat, cylindrical shape whose vertical length is shorter than the radius of the circle. The pedestal base 20 has a first upper main surface 20a and a first lower main surface 20b. The pedestal protrusion 22 protrudes upward from the center of the first upper main surface 20a of the pedestal base 20 in a generally truncated cone shape. The upper end of the pedestal protrusion 22 has a generally circular upper main surface 22a when viewed from above. The upper main surface 22a faces the lower main surface 122a of the protrusion 122. As shown in FIGS. 1 and 2, a space SP is formed between the first upper main surface 20a of the pedestal base 20 and the outer periphery 120a of the base 120.

[0041] The rotation of the base 2 is transmitted to the power generator 6. More specifically, the base 2 is connected to a rotor 60a of the power generator 6 via a speed increasing device 7 so as to be rotatable relative to the main body 1 about a first central axis Ax1 extending along the vertical axis. Specifically, the base 2 is connected to the lower end of the main shaft 8. As shown in FIG. 7, a fitting recess 22b is provided in the center of the upper main surface 22a. The fitting recess 22b fits into a fitting protrusion 84 of the main shaft 8.

[0042] As shown in Figures 3 and 7, the base 2 includes an operating arm 9. More specifically, a base recess 20d is provided in the first lower main surface 20b of the base 20. The operating arm 9 can be stored in the base recess 20d, as shown in Figures 3, 7, and 8.

[0043] The operating arm 9 includes an arm body 90, an operating knob 92, and a hinge 94. The arm body 90 is a plate-like member extending laterally along the radial direction of the pedestal base 20 and includes a second upper principal surface 90a and a second lower principal surface 90b. The arm body 90 has substantially the same shape as the pedestal recess 20d. The arm body 90 is fitted into the pedestal recess 20d so that the second lower principal surface 90b is flush with the first lower principal surface 20b of the pedestal base 20. A rotating end portion is provided on the left portion of the arm body 90. More specifically, the left portion of the arm body 90 is attached to the pedestal base 20 via a hinge 94 so as to be rotatable about a second central axis Ax2 extending along the front-to-rear axis relative to the pedestal 2. As shown in FIG. 7 , the operating knob 92 has a substantially cylindrical shape extending vertically. The operating knob 92 is attached to the free end of the arm body 90. In more detail, The operation knob 92 is attached to the right part of the arm main body 90. The operation knob 92 protrudes upward from the second upper principal surface 90a. The operation knob 92 is attached to the arm main body 90 so as to rotate about a fifth central axis Ax5 extending along the vertical axis.

[0044] 7, the base base 20 is provided with a mounting hole 20c that penetrates the first upper main surface 20a and the first lower main surface 20b in the vertical direction. The inner diameter of the mounting hole 20c is slightly larger than the outer diameter of the operation knob 92. The upper end of the operation knob 92 protrudes into the space SP through the mounting hole 20c that penetrates the base 2 in the vertical direction. More specifically, the upper end of the operation knob 92 is located above the first upper main surface 20a.

[0045] Next, the operation and effects of the disaster prevention radio 100 will be described with reference to FIGS. 8 and 9. The disaster prevention radio 100 is equipped with a manual power generator 6 that can supply power to the radio receiving device 30a. When the battery 50 cannot be charged by an external power source, the power generator 6 is manually driven to generate power. More specifically, when the base 2 rotates around the first central axis Ax1 relative to the main body 1, the rotor 60a rotates via the main shaft 8 and the speed increasing device 7. As the rotor 60a rotates, the power generator 6 generates power. The power generated by the power generator 6 is stored in the battery 50. The operation panel control unit 30 operates in response to an operator's operation on the operation panel 3 to instruct radio broadcast reception. The power stored in the battery 50 is supplied to the radio receiving device 30a by operation of the operation panel control unit 30. This allows the disaster prevention radio 100 to receive radio broadcasts even if the external power source is lost, such as during a disaster. The disaster prevention radio 100 can provide listeners with information such as evacuation sites in the event of a disaster. Furthermore, the disaster prevention radio 100 can supply power to external devices (not shown) such as smartphones via a micro-B USB port provided in the external output terminal block 36.

[0046] Specifically, from the state shown in FIG. 8(a), the operator pushes the operation knob 92 downward to remove it from the mounting hole 20c. As shown in FIG. 8(b), the operator rotates the operation arm 9 clockwise (in the direction of the outline arrow) when viewed from the front, around the rotation end of the arm main body 90. As shown in FIG. 8(c), the operator rotates the operation arm 9 180 degrees. The operation arm 9 protrudes leftward from the left end of the base 2 along the left-right direction.

[0047] 8(c), the operator holds the main body 1 with one hand, pinches the operation knob 92 with the other hand, and rotates the operation arm 9. As the operation arm 9 rotates, the base 2 rotates around the first central axis Ax1 relative to the main body 1. The operator continues rotating the operation arm 9.

[0048] The operating arm 9 can increase the rotation radius of the base 2. This makes it easier for the operator to continuously rotate the base 2, enabling stable generation of electric power. Furthermore, the rotation of the base 2 is accelerated by the speed-up device 7 and transmitted to the rotor 60a, enabling efficient generation of electric power.

[0049] When the operator finishes rotating the operating arm 9, he or she rotates the operating arm 9 counterclockwise 180 degrees as viewed from the front, centering on the rotating end of the arm body 90. The operator then fits the operating knob 92 into the mounting hole 20c from bottom to top. The operating arm 9 is then stored in the base recess 20d.

[0050] As shown in FIG. 9, the operator can carry the disaster prevention radio 100 by storing it in a plastic bottle holder PH attached to a backpack or bag. The shape and external dimensions of the disaster prevention radio 100 are similar to a 500 ml plastic drinking bottle. Therefore, the disaster prevention radio 100 can be stored comfortably in a plastic bottle holder PH that can store a 500 ml plastic drinking bottle. Furthermore, if the plastic bottle holder PH is made of mesh fabric or the like, the operator can listen to radio broadcasts while the disaster prevention radio 100 is stored in the plastic bottle holder PH. [Explanation of symbols]

[0051] 1: Main unit 54: Speaker 2: Base 6: Power generator 3: Operation panel 60: Generator body 30: Operation panel control unit 60a: Rotor 30a: Radio receiving device 7: Speed ​​increasing device 31: Hook 70: Intermediate gear 32: Power button 72: Rotating gear 33: Playback button 8: Main axis 34: Operation button set 9: Operation arm 35: Function button set 100: Disaster prevention radio 36: External output terminal block Ax1: First central axis 37: USB port Ax2: Second central axis 40: Passive radiator grille Ax3: Third central axis 42: Speaker grill Ax4: 4th central axis 44: Display panel Ax5: 5th central axis 46: Rod antenna SP: Space 48: Lighting Ring OP: Operator 50: Battery PH: Plastic bottle holder 52: Passive radiator

Claims

1. The device has a main body having a substantially cylindrical shape and a base having a substantially disk shape, The body has a first central axis extending along an up-down axis; the base is located below the body and has a first upper major surface and a first lower major surface; the first central axis passes through the center of the base when viewed from the top-bottom direction, the main body includes a radio receiver and a power generator that can supply power to the radio receiver by rotating a rotor; the base is connected to the rotor so as to be rotatable relative to the body about a vertical axis; It has external dimensions similar to a 500 ml PET drinking bottle. A disaster prevention radio that features:

2. the base is connected to the rotor so as to be rotatable relative to the body about the first central axis; 2. The disaster prevention radio according to claim 1.

3. the base includes an operating arm; a pedestal recess is formed in the first lower main surface of the pedestal, the operating arm is a plate-like member extending laterally along a radial direction of the base, and has a second upper main surface and a second lower main surface; the left portion of the operating arm is attached to the base so as to be rotatable about a second central axis extending along a front-rear axis with respect to the base; the operating arm is fitted into the base recess so that the second lower principal surface is flush with the first lower principal surface; 3. A disaster prevention radio according to claim 1 or 2.

4. A space is provided between the main body and the base, The base is provided with a mounting hole that penetrates in the vertical direction, an operation knob protruding upward from the second upper main surface is attached to a right portion of the operation arm; When the operating arm is fitted into the base recess, the upper end of the operating knob protrudes into the space through the mounting hole.

4. The disaster prevention radio according to claim 3.

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