JP7491189B2 - Floor impact sound generator - Google Patents

Description

Applicable under Article 30, Paragraph 2 of the Patent Act. Applicable under Article 30, Paragraph 2 of the Patent Act. Unveiled on October 12, 2020 at the SHM Lab in Sekisui House Ltd.'s Kansai Living Dream Factory.

The present invention relates to a floor impact sound generating device that generates floor impact sounds that correspond to real life sounds, allowing users to experience the floor sound insulation performance of a building.

Conventionally, facilities where people can experience floor sound insulation performance often use floor impact sound generating devices to measure floor sound insulation performance values, such as the banging machine and tapping machine shown in Patent Document 1.

JP 2001-4483 A

However, the floor impact sound generating device used to measure the above floor sound insulation performance values generates heavy or light floor impact sounds in accordance with JIS standards, and it is difficult for people who are not familiar with the floor impact sounds generated by the banging machine or tapping machine to evaluate the floor sound insulation performance.

The present invention was made in consideration of the above problems, and aims to provide a floor impact sound generator that can be attached to a falling object regardless of its characteristics, and that can change the falling height of the falling object and the interval between falling movements, so that it can reproduce the sound of an adult walking in real life, or the floor impact sound when a spoon or toy is dropped from a table.

In order to solve the above problems, the floor impact sound generating device of the present invention comprises a base placed on the floor, an arm of a long member whose base end is rotatably fixed to the base and whose tip has an attachment part for attaching a dropped object, a drive source fixed to the base, an output shaft extending horizontally from the drive source and transmitting the rotational drive of the drive source, a rotor fixed to the output shaft and rotating according to the output shaft, a protrusion fixed to protrude horizontally at a position of the rotor away from the output shaft, and a driven part fixed to protrude on the vertical surface of the arm on the drive source side, whose underside comes into contact with the protrusion when the protrusion rotates upward, and the attachment part is characterized in that the dropped object is attached in an exchangeable manner.

Furthermore, the falling objects include heavy falling objects and light falling objects, and the light falling objects are attached to the mounting part via a hanging string, and the mounting part is characterized in that it has a guide part around the hanging string that suppresses the swinging of the hanging string.

In order to solve the above problems, the floor impact sound generating device according to the present invention comprises a base placed on the floor, an arm of a long member whose base end is rotatably fixed to the base and whose tip has an attachment part for attaching a falling object, a drive source fixed to the base, an output shaft extending horizontally from the drive source and transmitting the rotational drive of the drive source, a rotor fixed to the output shaft and rotating according to the output shaft, a protrusion fixed to the rotor at a position away from the output shaft so as to protrude horizontally, and a driven part fixed to the vertical surface of the arm on the drive source side, whose underside comes into contact with the protrusion when the protrusion rotates upward, and the rotor is characterized in that two or more of the protrusions are detachably attached to the same circle centered on the output shaft.

Furthermore, the underside of the driven part is characterized by being inclined downward from the midpoint between the base end side of the arm of the driven part and the tip end side of the arm of the driven part toward the tip end side of the arm.

Furthermore, the base end of the arm is rotatably fixed to the base via a rotating body, and the arm and the rotating body are removable.

Furthermore, a cushion is provided on the base to prevent the arm from colliding with the floor and the base, and the upper end of the cushion is lower than the rotation position of the arm when the falling object collides with the floor.

Furthermore, the protrusion is fixed to the rotor so that the distance between the protrusion and the output shaft can be changed.

Furthermore, the position of the driven part fixed to the arm can slide in the axial direction and vertical direction of the arm.

Furthermore, the facility is characterized as being a floor sound insulation performance experience facility having a floor impact sound generating device according to any one of claims 1 to 8 installed on an upper floor, a switch for driving the floor impact sound generating device formed on a lower floor, and a display for displaying the floor impact sound generating device installed on the lower floor.

The floor impact sound generating device of the present invention allows any dropped object to be attached to the mounting section regardless of its shape, and by attaching a ball, spoon, or the like to the mounting section, floor impact sounds that occur in real life can be reproduced.

In addition, by attaching the lightweight falling object to the mounting section via a hanging string, the guide section limits the range of motion of the hanging string, suppressing excessive lateral swinging and excessive bouncing of the hanging string, preventing the lightweight falling object from colliding with the floor impact sound generating device of the present invention itself due to lateral swinging, and preventing the hanging string from getting tangled in the arm due to the lightweight falling object bouncing up.

According to the floor impact sound generating device of the present invention, the rotor can have two or more protrusions attached detachably on the same circle centered on the output shaft, and in the heavy falling object attachment method, by attaching two or more protrusions to the rotor, the time from when the arm falls until the next time the protrusions support the arm is shortened, making it possible to suppress unnecessary bouncing noises after the heavy falling object hits the floor. In addition, the number of times the arm is lifted per rotation of the output shaft can be changed depending on the number of protrusions attached to the rotor, making it possible to reproduce the rhythm of sounds such as walking sounds and children jumping around.

In addition, because the underside of the arm tip of the driven part is inclined downward, the timing at which the driven part comes into contact with the protrusion as it rotates upward is quicker than when the underside of the arm tip of the driven part is not inclined downward, and unnecessary bouncing noises after a heavy falling object hits the floor can be suppressed.

In addition, because the arm is rotatably fixed to the base via a rotating body, the arm can be freely attached and detached, and by replacing it with a different arm of a different length, it is possible to change the height at which the falling object will fall. Also, if the arm is damaged, it can be restored by simply replacing the arm.

In addition, a cushion is provided on the base to catch the arm as it rotates and falls, preventing the arm from colliding with other components and generating noise.

In addition, by changing the distance between the protrusion fixed to the rotating body and the output shaft, the rotation radius of the protrusion changes, and the falling height of the falling object can be changed.

Also, by being able to slide and fix the driven part in the axial and vertical directions of the arm, it is possible to adjust the contact position between the protrusion and the driven part. By sliding the arm tip side of the driven part upward and the arm base end side of the driven part downward on the arm and fixing the driven part at an angle relative to the arm, it is possible to delay the timing of contact between the driven part and the protrusion rotating upward. When two or more protrusions are attached to the rotating body, when the contact between the driven part and the protrusion is released and the arm is falling, the next protrusion rotating upward comes into contact with the driven part and lifts the arm, preventing the arm from being lifted before the falling object hits the floor and generating an impact noise.

In addition, the floor impact sound generating device of the present invention installed on the upper floor is projected on a display installed on the lower floor, and the experiencer can experience the floor sound insulation performance while watching the image, thereby improving the satisfaction of the experiencer. And by providing the drive switch of the floor impact sound generating device of the present invention installed on the upper floor on the lower floor, it is not necessary to go back and forth between the upper and lower floors every time it is started and stopped, and the guide can concentrate on serving the experiencer.

1 is an isometric projection view showing an example of a floor impact sound generating device according to an embodiment of the present invention. 4 is a partial cross-sectional view showing how an arm and a rotating body of a floor impact sound generating device according to one embodiment of the present invention are fixed to each other. FIG. FIG. 11 is a plan view showing the difference in drop height caused by arms of different lengths of a floor impact sound generating device according to another embodiment of the present invention. FIG. 2 is a plan view showing a state in which a lightweight falling object is attached to the floor impact sound generating device according to one embodiment of the present invention. FIG. 2 is a plan view showing a state in which a heavy falling object is attached to the floor impact sound generating device according to one embodiment of the present invention. 1 is a partial cross-sectional view showing how the arm and the follower are fixed to each other and how the follower body and the hanging part are fixed to each other in a floor impact sound generating device according to one embodiment of the present invention. FIG. 13 is a partial cross-sectional view showing how the arm and the follower are fixed to each other and how the follower body and the hanging part are fixed to each other in a floor impact sound generating device according to another embodiment of the present invention. FIG. 1 is an isometric projection view showing a rotating body of a floor impact sound generating device according to one embodiment of the present invention and a rotating body of a floor impact sound generating device according to another embodiment of the present invention. FIG. 1 is a cross-sectional view showing how a rotating body and a protrusion of a floor impact sound generating device according to an embodiment of the present invention are fixed to each other. FIG. 2 is a plan view showing the height of a cushion of the floor impact sound generating device according to one embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing a method of operating a floor impact sound generating device in a floor sound insulation performance experience facility according to one embodiment of the present invention. 1 is a plan view showing the operating principle of a floor impact sound generating device according to an embodiment of the present invention. 1 is a plan view showing the timing of contact between the driven part and the protrusions depending on the number of protrusions attached to the floor impact sound generating device according to one embodiment of the present invention. FIG. FIG. 11 is a plan view showing that the fall height of a fallen object can be changed by changing the mounting position of the protrusion of a floor impact sound generating device according to another embodiment of the present invention. FIG. 11 is a plan view showing that the drop height of a falling object can be changed by changing the height of the drive stand of a floor impact sound generating device according to another embodiment of the present invention. FIG. 11 is a plan view showing that the fall height of a falling object can be changed by changing the height of the arm stand of a floor impact sound generating device according to another embodiment of the present invention.

One embodiment of the floor impact sound generating device according to the present invention will be described below with reference to the drawings. The floor impact sound generating device 1 according to one embodiment of the present invention is a device that generates floor impact sound by causing a falling object 9 to collide with a floor 101, and as shown in FIG. 1, includes a base 2, an arm stand 20, an arm 3, a drive stand 210, a drive source 5, a rotating body 6, a cushion stand 220, and a cushion 7.

The base 2 is a plate-like member placed on the floor 101, and has an arm base 20, a drive base 210, and a cushion base 220.

As shown in FIG. 1, the arm stand 20 is a rectangular parallelepiped fixed to the base 2 with bolts (not shown), and the arm stand 20 has a rotating part 200 on the upper surface of the arm stand 20.

As shown in FIG. 1, the rotating part 200 is composed of two bearings 201, an arm rotation shaft 202, and a rotating body 203. The two bearings 201 are aligned so that their rotation shafts are in a straight line, and the arm base 20 is fixed to its upper surface with bolts (not shown) with a space between the two bearings 201 that allows the rotating body 203 to fit in.

As shown in FIG. 1, the arm rotation shaft 202 is an axis member that is inserted into the rotation shaft of the two bearings 201 and fixed so as to be rotatable.

As shown in FIG. 2, the rotating body 203 is a rectangular parallelepiped, with one surface protruding to fit into the arm 3, which is fixed to the arm 3 by a bolt 204 and rotatably fixed to two bearings 201 via an arm rotation shaft 202.

As shown in FIG. 1, the arm 3 is a long member made of a square pipe, and as shown in FIG. 2, the base end is fitted into a rotating body 203 and fixed with a bolt 204, so that it can rotate around the arm rotation axis 202, and the arm 3 can be removed from the rotating part 200 by removing the bolt 204. Therefore, as shown in FIG. 3, the falling height of the falling object 9 can be changed by replacing the arm 3a with one of a different length.

In addition, if the arm 3 is damaged, it can be restored by replacing it with another arm 3. The arm 3 has an attachment part 30 at the tip of the arm 3, and a driven part 4 midway between the tip of the arm 3 and the base end of the arm 3.

As shown in Figures 4 and 5, the mounting portion 30 has a vertical hole 31, a horizontal hole 32, and a guide portion 33. The vertical holes 31 are holes that penetrate the upper surface of the tip of the arm 3 and the lower surface of the tip of the arm 3, and three are provided at equal intervals from the tip of the arm 3 toward the base end of the arm 3. The horizontal holes 32 are holes that penetrate both side surfaces of the tip of the arm 3. The guide portion 33 is a long spring 33a whose outer diameter is smaller than the inner diameter of the vertical hole 31, and a nut 33b whose outer diameter is larger than the inner diameter of the vertical hole 31 and whose inner diameter is the same as the inner diameter of the spring 33a is attached to one end of the spring 33a.

As shown in FIG. 6, the driven part 4 is a member fixed to the arm 3 by a bolt 36 on the side of the arm 3 facing the driving source 5, and has a cubic driven part main body 4a and a triangular hanging part 4b that is fixed to the underside of the driven part main body 4a by a bolt 41 and thickens toward the tip of the arm 3.

The underside of the driven part main body 4a is exposed at the base end of the arm 3, and is covered by the hanging part 4b at the tip end of the arm 3. The underside of the driven part 4 is parallel to the underside of the arm 3 at the base end of the arm 3, and is inclined downwards as it approaches the tip end of the arm 3.

The underside of the driven part 4 has a cushioning part 4c made of a sponge material on the entire surface of the base end side parallel to the underside of the arm 3 and the tip end side that slopes downward toward the tip end of the arm 3. The cushioning part 4c is intended to prevent the generation of impact noise when the protrusion and the driven part 64 come into contact.

The position of the driven part 4 attached to the arm 3 will be described below. Hereinafter, the end of the driven part 4 on the base end side of the arm 3 will be described as the base end of the driven part 4, and the end of the driven part 4 on the tip end side of the arm 3 will be described as the tip end of the driven part 4. As shown in FIG. 12, when the arm 3 of the floor impact sound generating device 1 according to one embodiment of the present invention is dropped and viewed from the side in the axial direction of the arm rotation shaft 202, the tip of the driven part 4 is located closer to the tip end side of the arm 3 than the tip end side of the rotation path described by the protrusion 64, and the base end of the driven part 4 is attached so as to be located closer to the tip end side of the arm 3 than the base end side of the arm 3 than the base end side of the rotation path described by the protrusion 64.

As shown in FIG. 1, the drive table 210 is a rectangular parallelepiped lower than the arm table 20 and is fixed by a bolt (not shown) to a position closer to the tip of the arm 3 than the arm table 20 on the base 2 and offset in the axial direction of the arm rotation shaft 202 from the arm's third rotation range. The drive table 210 has a motor fixing table 212 and a spacer 211 on the upper surface of the drive table 210.

As shown in FIG. 1, the floor impact sound generating device 1 according to one embodiment of the present invention uses an electric motor 5 as the drive source 5, and the motor fixing base 212 is a member for fixing the motor 5 to the drive base 210 with bolts (not shown) so as to cover two surfaces, the underside of the motor 5 and the side surface of the motor 5 facing the arm 3, and a motor fixing base horizontal hole 213 is provided horizontally on the surface covering the side surface of the motor 5 so that the rotational drive of the motor 5 can be output.

As shown in FIG. 1, the spacer 211 is a long rectangular member for adjusting the installation height of the motor 5, and is fixed to the motor 5 and the drive base 210 with bolts (not shown) that secure the motor 5 and the drive base 210.

As shown in FIG. 1, the motor 5 is the driving source 5 of the floor impact sound generating device 1 according to one embodiment of the present invention, and is fixed to the driving base 210 by a bolt (not shown) using the motor fixing base 212, and has an output shaft 50.

As shown in FIG. 1, the output shaft 50 is a shaft member that protrudes from the motor 5 toward the arm 3 side parallel to the arm rotation shaft 202 through a motor fixing base horizontal hole 213 provided in the motor fixing base 212, and transmits the rotational drive of the motor 5 to the rotating body 6.

As shown in FIG. 8, the rotor 6 is a disk-shaped member that is fixed to the output shaft 50 using an output shaft fixing hole 60 provided in the center of the disk, and has two arms that protrude in radial directions parallel to the cross section of the output shaft 50 at positions symmetrical at 180 degrees. The arms have protrusion mounting holes 61 at their tips, and rotate in accordance with the rotation of the output shaft 50.

As shown in Figures 8 and 9, the protrusion 64 is a cylindrical member that is detachably fixed to the protrusion mounting holes 61 provided at the ends of the two arms of the rotating body 6 with a bolt 62 and a nut 63 so that the base protrudes horizontally toward the arm side, and rotates in accordance with the rotation of the rotating body 6.

As shown in FIG. 1, the cushion base 220 is a rectangular parallelepiped that is lower than the drive base 210 and is fixed with a bolt (not shown) on the base 2 at a position closer to the tip of the arm 3 than the drive base 210 and where it collides with the arm 3 when it rotates. The cushion base 220 has a cushion stand 221 on its upper surface.

As shown in FIG. 1, the cushion stand 221 is fixed to the top surface of the cushion base 220 with bolts (not shown) and is a member that clamps and supports the cushion 7 like a book stand, and fixes the cushion 7, which is a rectangular parallelepiped.

As shown in FIG. 10, the cushion 7 is a sponge member, and its height is adjusted to the height at which the cushion 7 and the arm 3 collide after the falling object 9 collides with the floor 101, preventing the tip of the arm 3 from colliding with the floor 101 and the floor impact sound generating device 1 itself, and avoiding damage to the floor impact sound generating device 1 and the generation of unnecessary impact sounds.

As shown in FIG. 11, a floor sound insulation performance experience facility 100 using a floor impact sound generating device according to the present invention has a floor impact sound generating device 1 according to one embodiment of the present invention and a camera 102 for photographing the floor impact sound generating device 1 installed on the floor 101 on the second floor of the floor sound insulation performance experience facility 100, and a drive switch 103 for the floor impact sound generating device 1 and a display 104 for displaying the image from the camera 102 are provided on the first floor.

The operating principle of the floor impact sound generating device 1 according to one embodiment of the present invention will now be described. As shown in Figures 1 and 12, the protrusion 64, which rotates in one direction by the rotation drive of the motor 5 via the rotor 6, comes into contact with the underside of the tip of the driven part 4 during upward rotation.

The protrusion 64 in contact with the underside of the tip of the driven part 4 continues to rotate, causing the contact point with the driven part 4 to slide from the underside of the tip of the driven part 4 to the underside of the base of the driven part 4, supporting and lifting the driven part 4.

As a result, the arm 3 to which the driven part 4 is fixed is lifted. When the contact point between the protrusion 64, which continues to rotate, and the driven part 4 slides to the underside of the base end of the driven part 4, the contact between the protrusion 64 and the driven part 4 is released, and the lifted arm 3 falls freely under its own weight, with the arm rotation shaft 202 as a fulcrum.

At this time, the falling object 9 attached to the mounting part 30 at the tip of the arm 3 hits the floor 101, generating a floor impact sound.

Then, the protrusion 64, which then rotates upward, comes into contact with the underside of the tip of the driven part 4, and the same action is repeated, automatically lifting and dropping the arm 3 in succession.

The mounting part 30 can mount the heavy falling object 9a and the lightweight falling object 9b in a convertible manner. The state of mounting the lightweight falling object 9b will now be described. As shown in FIG. 4, the end of the guide part 33 to which the nut 33b is attached is placed up, and the hanging string 8b is inserted into the guide part 33, in which the spring 33a is inserted into the vertical hole 31 from above. A knot is made at the upper end of the hanging string 8b inserted into the guide part 33, and the hanging string 8b is suspended by the knot being caught on the nut 33b. The lightweight falling object 9b is attached to the mounting part 30 by tying it to the lower end of the hanging string 8b. Hereinafter, this method of mounting a falling object will be described as the method of mounting a lightweight falling object.

In the lightweight falling object attachment method, the lightweight falling object 9b is tied to the hanging string 8b, so it can be attached regardless of the characteristics of the lightweight falling object 9b. When the lightweight falling object 9b hits the floor 101, the hanging string 8b jumps up with the force of the lightweight falling object 9b hitting the floor 101, and then falls again, reproducing the bouncing and rolling sounds of the lightweight falling object 9b hitting the floor 101.

In addition, the guide portion 33 limits the range of motion of the hanging cord 8b and suppresses excessive lateral swinging and excessive bouncing of the hanging cord 8b, thereby preventing the lightweight falling object 9b from colliding with the floor impact sound generating device of the present invention due to lateral swinging and preventing the hanging cord 8b from becoming entangled with the arm 3 due to the lightweight falling object 9b bouncing up.

In addition, since the three vertical holes 31 each have a different distance from the arm rotation axis 202, the drop height of the lightweight falling object 9b can be changed by using different vertical holes 31 for the lightweight falling object attachment method.

Next, the state of attaching the heavy falling object 9a will be described. As shown in FIG. 5, the heavy falling object 9a is covered with a net 8a, and the end of the net 8a is tied to the horizontal hole 32 to attach the heavy falling object 9a to the attachment part 30. Hereinafter, this method of attaching a falling object will be referred to as the heavy falling object attachment method.

In the heavy falling object mounting method, the heavy falling object 9a is fixed to the mounting part 30 using a net, so it can be mounted regardless of the characteristics of the heavy falling object 9a, and it is possible to reproduce the sound of an adult walking or a child jumping around without the need to reproduce the bouncing and rolling sounds after colliding with the floor 101.

The rotating body 6 of the floor impact sound generating device 1 according to one embodiment of the present invention can be fitted with up to two detachable protrusions 64. A case where it is preferable to have one protrusion 64 fitted to the rotating body 6 and a case where it is preferable to have two protrusions 64 fitted to the rotating body 6 will be described. In the lightweight falling object fitting method, the hanging string 8b bounces up with the force of the lightweight falling object 9b colliding with the floor 101 and falls again to reproduce the bouncing and rolling sounds of the lightweight falling object 9b after colliding with the floor 101, so time is required for the hanging string 8b to bounce up and for the lightweight falling object 9b to bounce and roll on the floor 101 after the lightweight falling object 9b collides with the floor 101. Therefore, as shown in FIG. 13, by attaching only one protrusion 64 to the rotor 6, the number of times that the protrusion 64 comes into contact with the driven part 4 and lifts the arm 3 is reduced to one time during one rotation of the output shaft 50, and the time from when the arm 3 falls until the next time the protrusion 64 comes into contact with the driven part 4 and the arm 3 is lifted can be used as the time it takes for the hanging string 8b to jump up after the lightweight falling object 9b hits the floor 101 and for the lightweight falling object 9b to bounce and roll on the floor 101.

Next, the method of attaching the heavy falling object requires that the heavy falling object 9a is fixed using a net 8a, and that continuous floor impact sounds are generated at regular intervals to reproduce the sound of walking or children jumping. In addition, the bouncing sound of the heavy falling object 9a is unnecessary. Therefore, as shown in FIG. 13, by attaching two protrusions 64 to the rotating body 6, the number of times that the protrusions 64 lift the arm 3 during one rotation of the output shaft 50 is two, shortening the time from when the arm 3 falls until the protrusions 64 next come into contact with the driven part 4 and the arm 3 is lifted, and shortening the interval at which the light falling object 9b continuously hits the floor 101. In addition, by shortening the time from when the arm 3 falls until the protrusions 64 next come into contact with the driven part 4 and support the arm 3, unnecessary bouncing of the heavy falling object 9a can be prevented.

The rotor 6 of the floor impact sound generating device 1 according to one embodiment of the present invention can be fitted with up to two protrusions 64, but can also be fitted with the shapes of the rotors 6a and 6b shown in FIG. 8. The rotor 6a is a disk-shaped member having an output shaft fixing hole 60 at the center of the disk for fixing to the output shaft 50, and three arms protruding from the center of the disk in a radial direction parallel to the cross section of the output shaft 50 at intervals of 120 degrees, and a protrusion mounting hole 61 is provided at the tip of the arm, allowing up to three protrusions 64 to be attached. The rotor 6b is a disk-shaped member having an output shaft fixing hole 60 at the center of the disk for fixing to the output shaft 50, and a protrusion attachment long hole 61a extending from the center of the disk in a radial direction parallel to the cross section of the output shaft 50, and four protrusion attachment long holes 61a are provided at 90 degree intervals, allowing up to four protrusions 64 to be attached. By using rotating bodies with different shapes in this way, the maximum number of protrusions 64 that can be attached can be changed, and the timing at which successive floor impact sounds occur can be altered.

As shown in FIG. 8, the protrusion 64 of the floor impact sound generating device 1 according to one embodiment of the present invention is attached to the protrusion mounting hole 61 of the rotor 6 with a bolt 62 and a nut 63, so the fixed position of the protrusion 64 is fixed and the rotation radius of the protrusion 64 cannot be changed. However, the rotor 6b shown in FIG. 8 has a protrusion receiving slot 61a extending from the center of the disk in a radial direction parallel to the cross section of the output shaft 50, and the protrusion 64 can be fixed by sliding it in the longitudinal direction of the protrusion receiving slot 61a. The closer it is to the output shaft fixing hole 60 of the rotor 6b, the shorter the rotation radius of the protrusion becomes. As shown in FIG. 14, by changing the rotation radius of the protrusion 64, the height to which the arm is lifted changes, making it possible to change the drop height of the falling object 9.

In the floor impact sound generating device 1 according to one embodiment of the present invention, as shown in FIG. 6, the bolt 36 is inserted into the driven part mounting hole 34 provided in the arm 3 so that the longitudinal direction of the driven part 4 is parallel to the axial direction of the arm 3, and the driven part 4 is mounted on the arm 3. The arm 3a shown in FIG.
Eight follower part mounting elongated holes 35 extending in the vertical direction of the arm 3a are arranged in the axial direction of the arm 3a at equal intervals with the pitch of the bolt holes provided in the follower part 4, and the inner diameter of the follower part mounting elongated holes 35 in the short side direction is larger than the bolt diameter of the bolt 36 for mounting the follower part 4. Therefore, it is possible to mount the follower part 4 to the arm 3a with the bolt 36 via a washer 37 having an outer diameter larger than the inner diameter of the follower part mounting elongated hole 35 in the short side direction. This makes it possible to mount the follower part 4 by sliding it in the vertical direction of the arm 3a in the longitudinal direction of the follower part mounting elongated holes 35, and by using the eight follower part mounting elongated holes 35 arranged in the axial direction of the arm 3a appropriately, it becomes possible to mount the follower part 4 by sliding it in the axial direction of the arm 3a. This makes it possible to change the mounting position of the follower part 4 so that the protrusion 64 comes into good contact with the follower part 4 when changing the height of the arm base 20 and the motor 5 or when changing the rotation radius of the protrusion 64.

Also, as shown in FIG. 7, the tip of the driven part 4 can be slid upward on the arm 3a, and the base end of the driven part 4 can be slid downward on the arm 3a to attach it to the arm 3a, thereby tilting the driven part 46. By tilting the base end of the driven part 4 downward, the timing of contact between the upwardly rotating protrusion 64 and the driven part 4 can be delayed. This eliminates the situation where the support of the driven part 4 by the protrusion 64 is released and the next upwardly rotating protrusion 64 comes into contact with the driven part 4 while the arm 3a is falling, lifting the arm 3a, and the falling object 9 does not collide with the floor 101.

In another embodiment other than the floor impact sound generating device 1 according to one embodiment of the present invention, as shown in FIG. 15, by using a high drive table 210a, the position of the drive source 5 becomes higher and the rotation position of the protrusion 64 becomes higher. This increases the contact position between the driven part 4 and the protrusion 64, and the falling height of the falling object 9 can be increased. Also, by using a low drive table 210b, the position of the drive source 5 becomes lower and the rotation position of the protrusion 64 becomes lower. This decreases the contact position between the driven part 4 and the protrusion 64, and the falling height of the falling object 9 can be decreased.

In another embodiment other than the floor impact sound generating device 1 according to one embodiment of the present invention, as shown in FIG. 16, by using a high arm base 20a, the position where the driven part 4 and the protrusion 64 come into contact is lowered, and the falling height of the falling object 9 can be lowered. Also, by using a low arm base 20b, the position where the driven part 4 and the protrusion 64 come into contact is higher, and the falling height of the falling object 9 can be increased. At this time, since the rotation range of the arm 3 changes, cushions 7a and 7b of different heights are used for the cushion 7 so that the height is based on the cushion position as described above.

As shown in FIG. 11, a guide leads the experiencer to the lower floor of the floor sound insulation performance experience facility 100, where a floor impact sound generating device 1 is installed on the upper floor, explains the floor impact sound generating device 1 shown on the display 104, and presses the drive switch. The experiencer's satisfaction is increased by simultaneously seeing and hearing the image of the floor impact sound generating device 1 shown on the display 104 and the floor impact sound reverberating on the lower floor.

In addition, guides can focus on guiding participants without having to go back and forth between upper and lower floors, which can improve participants' satisfaction.

The above merely shows one embodiment of the floor impact sound generating device according to the present invention, and can be modified as appropriate without departing from the spirit of the present invention.

REFERENCE SIGNS LIST 1 Floor impact sound generating device 2 Base 203 Rotating body 3 Arm 30 Mounting portion 33 Guide portion 4 Follower portion 4b Hanging portion 5 Driving source (motor)
50 Output shaft 6 Rotating body 64 Projection 7 Cushion 8b Suspension string 9 Falling object 100 Floor sound insulation performance experience facility 101 Floor 103 Drive switch 104 Display

Claims (9)

A base placed on a floor;
an arm of a long member having a base end rotatably fixed to the base and a mounting portion at a tip end for mounting a dropping object;
A drive source fixed to the base;
an output shaft extending horizontally from the drive source and transmitting a rotational drive of the drive source;
A rotor fixed to the output shaft and rotating along with the output shaft;
a protrusion portion fixed to the rotor at a position away from the output shaft so as to protrude in a horizontal direction;
a driven part that projects and is fixed to a vertical surface of the arm on the driving source side, and whose lower surface comes into contact with the protruding part when the protruding part rotates upward,
The floor impact sound generating device is characterized in that the attachment portion is adapted to attach the fallen object in a replaceable manner. The falling objects include heavy falling objects and light falling objects,
The lightweight falling object is attached to the attachment portion via a hanging string,
2. The floor impact sound generating device according to claim 1, wherein the mounting portion has a guide portion around the hanging cord for suppressing swinging of the hanging cord. A base placed on a floor;
an arm of a long member having a base end rotatably fixed to the base and a mounting portion at a tip end for mounting a dropping object;
A drive source fixed to the base;
an output shaft extending horizontally from the drive source and transmitting a rotational drive of the drive source;
A rotor fixed to the output shaft and rotating along with the output shaft;
a protrusion portion fixed to the rotor at a position away from the output shaft so as to protrude in a horizontal direction;
a driven part that projects and is fixed to a vertical surface of the arm on the driving source side, and whose lower surface comes into contact with the protruding part when the protruding part rotates upward,
The floor impact sound generating device is characterized in that the rotor has two or more of the protrusions detachably attached on the same circle centered on the output shaft. A floor impact sound generating device according to any one of claims 1 to 3, characterized in that the underside of the driven part slopes downward from the midpoint between the base end side of the arm of the driven part and the tip end side of the arm of the driven part toward the tip end side of the arm. A floor impact sound generating device according to any one of claims 1 to 4, characterized in that the base end of the arm is rotatably fixed to the base via a rotating body, and the arm and the rotating body are removable. A floor impact sound generating device according to any one of claims 1 to 5, characterized in that a cushion is provided on the base to prevent the arm from colliding with the floor and the base, and the upper end of the cushion is lower than the rotation position of the arm when the falling object collides with the floor. The floor impact sound generating device according to any one of claims 1 to 6, characterized in that the protrusion is fixed to the rotating body so that the distance between the protrusion and the output shaft can be changed. A floor impact sound generating device according to any one of claims 1 to 7, characterized in that the position of the driven part fixed to the arm can slide in the axial direction and vertical direction of the arm. A floor sound insulation performance experience facility comprising: a floor impact sound generating device according to any one of claims 1 to 8 installed on an upper floor; a switch for driving the floor impact sound generating device formed on a lower floor; and a display for displaying the floor impact sound generating device installed on the lower floor.

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