Acoustics – Sound-modifying means – Sound absorbing fence or screen
Reexamination Certificate
1999-04-08
2001-01-16
Dang, Khanh (Department: 2837)
Acoustics
Sound-modifying means
Sound absorbing fence or screen
C181S206000, C181S209000, C181S295000
Reexamination Certificate
active
06173806
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a newtype of muffling panel capable of damping and absorbing sound in low to medium sound ranges. More specifically, the present invention relates to a muffling panel of lightweight construction having a function of effectively excluding at a high level a sound in low sound and medium sound ranges in particular, which is useful in the walls and floors of buildings, sound absorbing walls in hallways, sound insulating walls along railroad tracks/expressways, soundproofing walls for machinery and engine rooms, and noise eliminators (mufflers) for internal combustion engines and the like.
2. Description of the Related Art
In general, thick walls made of a material with a large mass are required to isolate low sounds, and low and medium sounds of high sound volume, and up to this time, concrete walls, as well as steel, aluminum and other metal walls provided on the inside thereof with sound absorbing materials have often been used. However, walls of so-called heavy construction such as this type of walls are costly to manufacture, and also require considerable time and efforts to construct the same. Further, in the past, some attempts were also made to isolate sound by using a electrically produced reverse-phase sound, but this approach has drawbacks, such as problems of electric power to be consumed proportional to sound volume, complicated equipment to be constructed, and high costs for manufacturing thereof, and therefore, it never achieved widespread general use.
Under these circumstances, the present inventor, as a result of cumulative diligent research, having as an object the development of a new-type muffling panel of lightweight construction, having a simple construction, being inexpensive to manufacture, and having excellent muffling and sound-absorbing properties across a wide frequency band area, and being capable of effectively isolating sound in low sound and medium sound ranges in particular, has completed the present invention by successfully developing the below-described muffling panel of a completely new construction.
SUMMARY OF THE INVENTION
The present invention has as an object providing a new-type muffling panel of lightweight construction, having a function of effectively isolating sounds in low sound and medium sound ranges.
The present invention relates to a muffling panel having high muffling and sound-absorbing properties in a relatively low frequency band area, and relates to a muffling panel characterized in that it comprises, at the least, two opposing diaphragms, a frame body for affixing these diaphragms, and a mechanical type opposite (reverse) phase vibration transmitting mechanism for linking these diaphragms so they communicate with one another, and the above-mentioned vibration transmitting mechanism is constituted so as to transmit the vibration of a diaphragm of the one side, which vibrates upon receiving a sound, to a diaphragm of the other side by mechanically changing same to an opposite (reverse) phase vibration, thus causing the diaphragm of the other side to displace inward or outward, and vibrate simultaneously with the diaphragm of the one side in accordance with the above-mentioned original sound vibration energy.
The present invention has as an object providing a newtype muffling panel of a lightweight construction, having high muffling and sound-absorbing properties in a relatively low frequency band area, and having a function of effectively isolating at a high level sounds in low sound and medium sound ranges in particular.
Further, the present invention has as an object providing a muffling panel of lightweight construction, which is useful in the walls and floors of buildings, sound absorbing walls in hallways, sound insulating walls along railroad tracks/expressways, soundproofing walls for machinery and engine rooms, and noise eliminators (mufflers) for internal combustion engines and the like.
Furthermore, the present invention has as an object providing a muffling panel of lightweight construction, having a simple structure, being inexpensive to manufacture, and being capable of installing in a short period time.
The present invention, which solves for the above-mentioned subjects, comprises the following technical means.
(1) A muffling panel of lightweight construction, having high muffling and sound-absorbing properties in a relatively low frequency band area, which comprises, at the least, the following members:
(a) two opposing diaphragms;
(b) a frame body for affixing these diaphragms; and
(c) a mechanical type opposite phase vibration transmitting mechanism for linking these diaphragms so they communicate with one another,
wherein said vibration transmitting mechanism is constituted so as to transmit a vibration of a diaphragm of the one side, which vibrates upon receiving a sound, to a diaphragm of the other side by mechanically changing same to an opposite (reverse) phase vibration to cause the diaphragm of the other side to displace inward or outward, and vibrate simultaneously with the diaphragm of the one side in accordance with said original sound vibration energy.
(2) The muffling panel of (1) above, wherein the vibration transmitting mechanism comprises an apparatus (transmitter), which is supported in the middle in a freely rotating manner at a fixed point between two diaphragms, and each end thereof is linked to a corresponding diaphragm.
(3) The muffling panel of (2) above, wherein said transmitter comprises an oscillating link and secondary links, the oscillating link is supported in the middle in a freely rotating manner at a fixed point between two diaphragms, the secondary links are hinged, respectively, to both ends of this oscillating link, and the end of this secondary link is linked to a corresponding diaphragm.
(4) The muffling panel of (3) above, wherein said secondary link comprises a filament body, both ends of said oscillating link are connected to corresponding diaphragms via this filament body, and this oscillating link is biased by a bias spring so as to apply tensile force to this filament body.
(5) The muffling panel of (1) or (2) above, wherein the frame body comprises a grate having a plurality of compartments, a diaphragm is affixed to both sides of this grate, two opposing diaphragms are formed in each compartment, and the vibration transmitting mechanism links a diaphragm of one side of one of the compartments of the grate to a diaphragm of the other side of an adjacent compartment so they communicate with one another.
(6) The muffling panel of (2) above, wherein said transmitter comprises at least two main links, which are hinged together and are linked at each end thereof to a corresponding diaphragm, and at least two secondary links, each end of which is hinged to a midpoint of a corresponding main link, and these main links and secondary links act in concert, constituting parallel links.
(7) The muffling panel of (1) or (2) above, wherein two diaphragms formed in the shape of trumpets are mounted to the opening portions of both sides of a box body, which is partitioned in the middle by a partitioning panel.
(8) The muffling panel of (1) above, wherein the vibration transmitting mechanism comprises two pistons-cylinders, the insides of which are filled with fluid, and the piston, which fits into each cylinder, is connected to a corresponding diaphragm, and both cylinders are linked together so that when the piston of one side moves, the piston of the other side moves in the opposite direction.
(9) A muffling panel of lightweight construction, having high muffling properties in a relatively low frequency band area, which comprises two diaphragms characterized in that a side edge of each of two diaphragms is supported on a spindle in a freely rotating manner, and furthermore, a diaphragm that moves in unison with these diaphragms is provided so as to extend on the opposite side thereof with this spindle in between, and, as needed, a partitioning panel is formed between said two diaphragms.
M
Dang Khanh
Itoon
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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