JPS5964070A - Speaker for breathing mask - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Technical field This invention relates to a transmitter for a respiratory mask.

For recipients of prior art respirators,
It is necessary to enable the person to converse naturally with others without unduly impairing the volume or clarity of the person's conversation. At the same time, it must be ensured that no leakage paths are created through the microphone into the respiratory mask. However, reconciling these two demands is a huge national challenge.

SUMMARY OF THE INVENTION In the transmitter for a respiratory mask according to the present invention, at least one end of a tube provided with a unidirectional relief box is surrounded by a baffle skirt, and the skirt itself is surrounded by a baffle skirt. Surrounded by a skirt. In this way, sound waves emitted by the respirator cover and air vibrations passing such vibrations through the unidirectional pulp are passed through the tube and out of the protrusion. It enters into a spiral (folded) passage formed by the front wall, the skirt of the baffle, and the outer skirt.

The passage increases in severity as it extends from one end of the tube, thus forming a diverging horn with the required acoustic performance. In a preferred embodiment, the tube has a truncated conical shape that tapers away from the subject, and the bubble skirt is correspondingly connected to the outer wall of the tube and the bubble. The pulp is shaped like a truncated cone and has an inclination angle larger than the angle of the taper of the diverging horn formed between the skirt and the pulp. It is considered to be an element of

The front face of the bubble, which is placed in front of the pulp of the protrusion, is a strong protective wall and includes an inwardly directed boss extending partially into the tube. , thus allowing it to form in the darkness with the throat tube of itself and the horn component.

This boss is tapered inward. In order to set both the protection factor and acoustic performance of the respirator to predetermined ideal values, the internal volume of the tube and the external volume of the pulp are set to predetermined values. The baffle is adapted to cooperate with a peer tube for audio equipment. Alternatively, the front portion of the baffle can act as a low-mass diaphragm that can partially protect the tube and its inner pulp and act as a transmitter for the front stage of audio vibrations. Good too.

The entire transmitter described above may be formed as a single unit adapted to be inserted into and sealed to the vane part of the respiratory mask.

Examples of the present invention will be described below with reference to the accompanying drawings.

1 to 4, the transmitter 1 has a cylindrical outer skirt 4 with an annular flange 5 at one end. This one end is the inner end that is brought closer to the mouth of the temporary shielder of the respirator in use, and the face member of the respirator is connected to the skirt 4.
The outer 7 lunges 6vc are tightened.

A truncated conical tube 7 that narrows outward is provided inside the flange 5, and a central hub 9 supported by the spider 10 is provided at the outer end of the tube 7. An opening 8 is provided.

The unidirectional valve 11 has a plate of rubber or other resilient material on which a plurality of coaxial grooves, such as can be seen as concertina portions 12 as shown in FIG. The concertina portion 12 is fixed to the central boss 9 by a nail protruding through a hole provided in the central boss 9, and an end of m is formed. It is held by a cap 13. The edges of the plate adjoin but do not touch the 7 lunges at one end of the tube 7, so that air can pass through these ends and escape from the respiratory mask.

As shown in FIG. 1, a truncated conical skirt 15 of a baffle 16 having an end wall 17 made of a hard material is provided on the outside of the outer wall 14 of the truncated conical tube 7. , the outer surface of the valve 11 is protected. This baffle 16 is positioned, permanently or temporarily, to project inwardly from the outer end of the skirt 4 via a spider 18 (FIG. 3).

The conical shape of the skirt 15 corresponds to the outer surface 140 of the tube 7.
It is not the same as a cone, but is slightly larger. Then, between both the skirt 15 and the tube 7, the inner surface 2 of the flange 5 of the transmitter M (assembly) is inserted from the front part of this bubble.
A passage 19 is formed that gradually increases 1pIi1 in the radial direction toward 0. Furthermore, the skirt 1 in this transmitter
The passage 21 formed between the outer wall surface of the transmitter 5 and the inner wall surface of the skirt 4 also has a radial recess that gradually increases toward the outside of the transmitter. The filling part 22 at the corner between the skirt 4 and the flange 5 not only fully reinforces the corner but also extends from the valve 11 to the channel part (
Aisle) 21, @! ! This improves the acoustic performance of the continuously expanding horn-shaped channel formed by these members as the air grows into the opening. This channel is actually an exponentially folded horn.

The bubble supplementing the spider 18 is of any suitable type that can be separated from the rest of the transmitter so that it can be snapped or screwed onto the front part of the skirt 4.

This provides the desired access to the outside of the bulb's protrusion to facilitate repositioning or removal of the bulb.

In a variant shown in FIG. 4P, this bubble has a similar frustoconical skirt 15 whose downsized flange 25 is sealed with a very low pawn shop diaphragm 26. Since this diaphragm does not have any full sealing function, it can be selected to have as low a mass as possible depending on its desired acoustic performance. Furthermore, it may substantially form an input section for an acoustic device such as a microphone or the like.

Placing the valve 11 at one end of the tube 7 increases the gas-containing space within the respirator behind the outlet of this valve and moves it away from the face of the person being shielded. . This in itself is preferred 641+ and also provides a resonant line of considerable capacity behind the valve 11. And this is a good thing from a qualitative standpoint of conversation.

A preferred embodiment is shown in FIGS. 5-7. This example, except for the set position of the valve,
It may be substantially the same as that shown in FIGS. 1 to 3.

The transmitter 31 has a cylindrical outer skirt 34 with an annular flange 35 at its inner end in use. The face member 39 of this respirator is pressed axially through a ring 37 onto a detent rib 38 and is pressed axially through a ring 37 onto a detent rib 38 and into a seven flange 36 on the outside of the outer skirt 34.
It is designed to be mated to the A truncated conical tube 40 that narrows outward is snapped into the flange 35, and the spider 4 is attached to the end of the inner 11411 of the tube 40, and therefore to the inside of the flange 35.
A hole 41 is provided with a central hub 42 supported by 3. The valve 44 includes a plate made of rubber or other elastic material, on which is fixed to the central hub 42 via a bevel 46 integrally molded with rubber, as shown in FIG. A plurality of coaxial grooves (ridges) serving as a concertina portion 45 are formed. This vest 46 is pulled onto a person when extended, and when relaxed, it is attached to the central hub 46 via a catching bulge 47.
2. Thus, the valve 44 in this second embodiment is at the opposite end of the tube from the valve 2 in the first embodiment. This valve is in contact with the edges of the respirator so that air can escape from the respirator through these edges. This configuration gives the possibility of 'dynamic leakage', which is distinguished from static leakage, when the valve is open [1, rearward] and, in particular, that the valve closes at the end of the transmission of vibrations. It has become.

Installing the valve 44 at the base of the protrusion 400 means that
This increases the gas-containing space in the horn opposite the outlet of the valve.

Therefore, by partially filling the post 52 inside the protrusion 40, the volume of the space can be controlled. There is a trade-off to be made between the increased safety in terms of volume and dynamic leakage afforded by the maze on the other side of the valve, and the loss of sound quality in such a passage. The inventors of the present invention believe that if a considerable amount of free space is provided in the above-mentioned protrusion 40, although it is limited to the portion 53 forming the throat of the horn, a protection factor of 105 or a loss in sound quality can be achieved. It has been found that if good dynamic leakage conditions are obtained, in other words the amount of contaminants passing backwards across the pulp can be maintained at at most 10 PPm. Therefore, the second embodiment is preferred over the first real/M example.

On the outside of the outer wall body 48 of the truncated conical tube 40, -
A frustoconically shaped inner skirt 49 of the baffle 50 is provided with an end wall 51 of solid material. this bubble 5
0, the protrusion 4 is inserted so that the pos 52 forms the throat 53.
It stands out within 0. In this way, this buff 1VF
1. The entire outer surface of the pulp 44 is protected. This baffle is positioned by a spider 54 projecting inwardly from a seven runci 55. The seven flange 55 is adapted to be snapped onto the outer end of the outer skirt 34.

As in the first embodiment, the conical shape of the inner skirt 490 is not identical to the conical shape of the outer surface 48 of the tube 40, but is slightly larger. Thus, between both the skirt 49 and the tube 40 there is a passage which increases in longitudinal width as it is spaced apart from the front part of the valve towards the inner surface 57 of the flange 35 of the transmitter. 5
6 is formed. Furthermore, a passage 58 formed between the outer wall surface of the inner 7-piece cutout 49 and the inner wall surface of the outer cutout 134 of the transmitter extends outwardly from the transmitter. Its radial width increases as it advances. The rounded portions 59 at the corners of the outer skirt 34 and the seven flange 35 are provided for the same reason as the recesses 22 in FIG.

The snap fit between baffle 50 and tube 40 allows for desired and easy access to the outer MS of the valve for replacement or removal of the valve.

On the back side of the flange 35, means for attaching an air guide 61, in this embodiment 2 a cantilevered flange 60, is installed. This air guide is acoustically matched.

The baffle may include an input for an audio device such as a microphone.

The only non-hard parts of the above assembly (telephone) are the valve (P and optionally selected diaphragm as shown in Figure 4); all hard parts are metal,
It is clear that it can be manufactured from thermoplastic or thermosetting plastic materials by a simple process. Irrespective of the fact that the degree of hardness of these parts imparts the desired strength, it means that their hardness does not cause a substantial loss of speech energy.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of this tg light at the diameter of the transmitter, FIG. 2 is a plan view taken in the direction of arrow 2 in FIG. 1, and FIG. 3 is a plan view as seen in the direction of 3, FIG. 4 is a partial cross-sectional view of a modified example of the bubble in the transmitter 2, and FIG. 5 is a transmitter of another embodiment of this investigation. Figure 6, a cross-sectional view of the diameter of the vessel, is the same as Figure 5.
FIG. 7 is a plan view as seen in the direction of arrow 2' in the figure, and FIG. 7 is a plan view as seen in the direction of arrow 3 in FIG. 1... Transmitter of the first embodiment, 4... Outer skirt, 5.6... 7 runci, 7... truncated conical tube, lO... spider, 11...・Unidirectional pulp, 14...M [body, 15...skirt, 16...baffle, 18...spider,
19...Aisle, 21...Aisle, 31...Second
Fire example transmitter, 34...outer skirt, 3'
5.36... 7 runci, 40... truncated conical tube (protrusion), 42... central hub, 43.
... Spider, 44 ... Valve, 48 ... Outer wall 4
, 49...Skirt, 50...Baffle, 52...
·boss. Patent Applicant Avon Industrial Polymers Limited Representative Patent Attorney Aoyama Aoyama and 1 other person F・6・〜・Z

Claims (9)

[Claims] (1) A hollow tube (7, 40) with both ends open;
)(
15,49)'! a bubble (16,50) with a bubble (16,50) and an inner bubble (15,49) from the tube (7,40).
), the outer surface (14, 48) of the tube (7, 40), the baffle (16, 50) and the skirt (4, 34);
The above-mentioned tube (7, 46) forms a bent passageway (19, 21, 5a58) extending from one end of the tube (7, 46) in which the number of recesses increases as it extends from one end; A transmitter for a respiratory mask (1, 3) equipped with a unidirectional valve (11, 44)
1). (2) The cross-sectional shape of the tube (7, 40) is a truncated cone, and the cone extends toward the one end.
The transmitter according to claim 1, which is defined as item (b). (3) The cross-sectional shape of the inner skirt (15, 49) is a truncated cone shape, and the inner skirt (15, 49) is curved in the same direction as the tube (7, 40).
The angle of the tapered surface of (15, 49) is the angle of the tapered surface of the tube (7,
40) The transmitter according to claim 2, wherein the angle of the tapered surface is larger than the angle of the tapered surface of item 40). (4) The unidirectional valve (11, 44) is. A transmitter according to any one of claims 1 to 3, which is provided at an end opposite to one end of the tube (7, 40). (5) The unidirectional valve (11, 44) is provided at the one end of the tube (7, 40). vessel. (6) The transmitter according to any one of claims 1 to 5, wherein the baffle (16, 50) is made of a hard material. (7) The transmitter according to claim 6, wherein the second baffle (50) has a boss (52) extending into the tube (40). (8) The transmitter according to claim 7, wherein the boss (52) is tapered toward the front as it extends inward of the tube (40). (9) A portion of the bubble (16) extending beyond one end of the tube (7) is formed by a combustible diaphragm (
26) The transmitter according to any one of claims 1 to 5, formed by the above. The unidirectional pulp in the above tube (7,40
) includes an annular flange protruding into the inside and an elastic plate;
The peripheral part of the plate abuts the flange and is moved away from it by the airflow passing through the pulp, while the central part of the plate bears the spider (10, 43)'! A transmitter according to any one of claims 1 to 9, which is connected to the seven lunges via a transmitter.