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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a conventional
pipe duct, and FIGS. 2 and 3 are plan sectional views showing the attachment of the pipe duct to
a baffle plate, FIGS. FIG. 7 is a view showing the manufacturing process of the pipe duct of the
present invention, and FIGS. 8 and 9 are plan sectional views showing the duct attached to the
pan plate. 1 ········· Pipe duct ··············· Baffle plate, 3 ····························· Duct part, 5 ······················ Drive
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the pipe duct of a speaker phase reversal cabinet. Needless to say, the pipe ducts of the phasereversing cabinet are used to reverse the air on the back of the speaker to the front, or they are
scraped in the duct. In this case, the air vibrates □ Therefore, the vibration should not cause
abnormal resonance noise from the duct, or change in shape due to temperature change or
humidity change under normal use conditions. However, because of the material used for the 7piece paper pipe duct that is widely used in recent years, it is not possible to sufficiently suppress
the abnormal resonance noise. In addition, since FIG. 1 shows the appearance of a conventional
pipe duct, it is constructed by spirally winding kraft paper in multiple layers. As shown in the
figure, the staple needle is driven in the direction of the arrow by compressed air from the center
direction of the baffle opening and fixed, or as shown in FIG. It is identified by the staple from the
direction of. That is, when attaching the conventional product (-when mounting, it is necessary to
fix from the center direction of the baffle opening, so as the inner diameter becomes smaller, it
becomes more difficult to hit, therefore the piece 3 is necessary for weaving as shown in jp3iN
Therefore, the number of manufacturing processes increases and the problem is 44 strongly.
This invention intends to solve such a drawback, and in the following, one embodiment of this
invention will be described with reference to FIG. 0, that is, FIG. 8 shows a pipe duct (2) and an
opening 3 of a buckle plate 2. The figure shows a cross-sectional view from the front, and a
figure 9 shows a book in which the pipe duct 1 is deposited on the inner surface of the baffle
plate 2. The duct is composed of a cylindrical duct portion 4 and a ridge portion 5 integrally
formed at one end with the seven ends, and this duct is made as follows. As described above, the
net 6 is provided in the tank 6, filled with the regenerated pulp solution obtained by beating
newspapers, magazines, etc. from this -L part, and then draining off the water as shown in 1),
Only the pulp is collected, and as shown in Fig. 6, the pulp portion is removed from the net and
dried 2. Furthermore, as shown in the 7th district, the duct is completed by punching out only
1F8. In this case, if necessary, this duct may be impregnated with an anti-floating agent etc. As
described above, the present invention reappears on the paper duct of the pipe duct 1 as
described above, and it is made by scraping it. Because the duct N4 and the ridge 5 are integrally
formed, it is easy to attach a single layer to the baffle surface (3), and the material itself has a
sound absorbing effect, so it is abnormal due to the sound pressure on the back of the speaker It
is possible to reduce the number of processes without producing resonance and further reducing
the number of processes in its production. 0
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