JPH078568A - Air respirator - Google Patents

Abstract

(57) [Summary] [Purpose] To enhance the safety and economy of the mechanism for attaching and detaching the face piece of the air respirator and the air supply valve. [Structure] An air respirator 1 includes a face piece 2, an air supply valve 4, and
The contact member 5 is detachably interposed between them. The joint member 5 is provided with a connecting means 26 for the face piece 2 and a pair of elastic pin members 41 that are connecting means for the air supply valve 4. The elastic pin member 41 clamps the connecting pipe 18 of the air supply valve from the left and right direction of the diameter, and the pinching can be released only when the pair of pressing members 35A and 35B in the vertical direction of the diameter are simultaneously pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air respirator including a face piece to be worn on the face and an air supply valve for supplying clean air to the face piece.

[0002]

2. Description of the Related Art In an environment filled with a high concentration of toxic gas that exceeds the filtration capacity of a gas mask, or in an oxygen-deficient environment,
BACKGROUND ART An air respirator is widely used as a respiratory protection device that supplies clean air to workers who are engaged in fire fighting and emergency activities.
Most of this kind of air respirator is composed of a face body covering the face and an air supply valve for supplying clean air to the face body, and the air supply valve includes a pressure reducing valve from a high pressure cylinder carried by an operator. A medium pressure conduit extending therethrough is connected.
In such a face piece, the face piece and the air supply valve are made detachable, and the worker first wears the face piece as a face protector, connects the air supply valve when toxic gas is generated, and uses it as an air exhaler. Techniques are known. Japanese Patent Office Sho 58
The technique disclosed in Japanese Patent Publication No. 47184 is an example thereof.

In this known air breather, a U-shaped clip is provided in the intake passage on the side of the face piece, and an annular groove with which the leg portion of the U-shaped clip engages is provided on the outer periphery of the connection pipe on the air supply side. When the connecting tube is inserted into the passage, the leg snaps into the groove and connects the face piece and the air supply valve. When the bottom portion of the U-shaped clip is pushed in the radial direction of the intake passage, the legs open in the left-right direction and come out of the groove, so that the connecting pipe can be pulled out from the intake passage.

[0004]

By the way, in the case of the above-mentioned known air respirator, even if the clip is U-shaped,
The legs tend to open in a V-shape, and it is difficult for the force to tighten the connecting pipe to be uniform on the left and right. As a result, the force distribution is biased, and sometimes the connecting pipe is likely to come off. Also, the connecting pipe can be removed by pressing the bottom of the U-shaped clip, so it seems convenient for removal at first glance, but if the bottom hits an object while using an air breather, the connecting pipe will be easy. There is a problem of coming off. Furthermore, this air respirator has the following features:
There is a problem that the expensive face piece must be replaced as a whole, which increases maintenance costs.

Therefore, the present invention has an object to solve the above-mentioned problems of the prior art by connecting the face piece and the air supply valve through a joint member which is detachably engaged with both of them. There is.

[0006]

[Means for Solving the Problems] The present invention provides means for solving the above problems as follows.

The present invention is premised on an air respirator comprising a face piece and an air supply valve detachably attached to the intake port of the face piece.

On this premise, the features of the present invention are the following points. (1) A contact member that removably engages with the face piece and the air supply valve is interposed. (2) A first tubular member, in which the joint member has a first opening on the side of the face piece and a second opening on the side of the air supply valve; and the first opening and the face piece that are detachably engaged with the intake port of the face piece. And a connecting means capable of connecting in an airtight state. (3) The first tubular member is sandwiched between the first and second flanges arranged close to each other on the outer periphery in the vicinity of the second opening; the first and second flanges are sandwiched between the first tubular member and the first tubular member, and the first tubular member opposes in the vertical direction. A pair of pressing members that are slidable in the vertical direction; arranged so as to cross the inside of the pipe of the first tubular member on the left and right in the radial direction, and retreat from the inside of the pipe when the pair of pressing members are pressed radially inward at the same time. A point having at least a pair of elastic members that are elastically deformed in the direction in which (4) A connecting pipe in which the air supply valve is fitted in the first tubular member in an airtight state when inserted through the second opening; and the elastic member is engaged with the outer periphery of the fitted connecting pipe in the radial direction. Then first
And engagement means capable of preventing disengagement from the tubular member.

In a preferred embodiment of the present invention, required areas of the first and second flanges and the pressing member are covered with an air-impermeable elastic cover member. In another preferred embodiment, the connecting means is fitted to the outside of the vicinity of the first opening of the first tubular member so as to be rotatable in the circumferential direction and non-removable in the axial direction, and to be screwed into the intake port. Second compatible
It is a tubular member.

[0010]

The air breather thus constructed has the following actions. (1) The first tubular member can be attached to the intake port of the face piece via the connecting means, and the air supply valve engages the pair of pin members from the left and right when the connecting pipe is inserted into the second opening. However, it can be attached to the first tubular member without being easily separated. (2) When the pair of pressing members are simultaneously pressed inward in the radial direction of the first tubular member so as to approach each other against the elasticity of the pin member, the pin member is elastically pressed in the direction of retreating from the inside of the tubular member. It deforms to release the engagement with the connecting pipe, and the air supply valve can be removed. (3) When the pin member is damaged, only the joint member needs to be replaced, and the face piece and the air supply valve can be used as they are. (4) By covering the first and second flanges and the pressing member with the air-impermeable elastic member, the gap between the first and second flanges and the sliding portion of the pressing member can be made airtight.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the air respirator according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view showing the air respirator 1 partially broken away. The air breather 1 is a face piece 2 to be worn on the face.
And an air supply valve 4 connected to a medium pressure conduit 3 extending from a pressure reducing valve of a high pressure air cylinder (not shown) storing clean air,
The contact member 5 is interposed between the face piece 2 and the supply valve 4. The face piece 2 is composed of a main body 7 made of soft rubber, an eyepiece 8 made of a transparent plastic plate material, and a face opening 9 made of a plastic molded product. The face body 2 has a peripheral edge of the main body 7 for contact with a face. It has a lip 7 </ b> A and a mounting member 11 for the tightening string 10. The face opening 9 is attached to the main body 7 in an airtight state by a belt 12, and has an intake port 16 provided with a check valve 15 that can be opened in the intake direction of clean air and a reverse port that can be opened in the discharge direction of exhaled air. And an exhaust port 20 having a stop valve (not shown).

The air supply valve 4 has a storage portion 17 for a diaphragm valve which is opened by the exhalation operation, a connecting pipe 18 which can be fitted in the joint member 5 in an airtight state, and a connecting portion 19 for connecting the intermediate pressure conduit 3. .

The joint member 5 includes a first tubular member 25 into which the connecting pipe 18 can be inserted, and an intake port 16 located on the outer periphery of the member 25.
It has a second tubular member 26 that is detachably screwed to and a holding frame 28 of a pressing member 27 described later.

FIG. 2 is a partially enlarged view of FIG. 1, showing the mutual relationship among the face piece 2, the air supply valve 4, and the joint member 5. However, the face piece 2 and the air supply valve 4 are shown by imaginary lines.

In the joint member 5, the first tubular member 25
Has a first opening 37A at an inner end on the side of the face piece 2 and a second opening 38A at an outer end facing the first opening 37A. Second tubular member 2
6 is fitted to the first tubular member 25 so as to be rotatable in the circumferential direction and slidable in the axial direction. However, the first tubular member 2
A fixed ring 27 protrudes from the outer peripheral surface of 5, and the second tubular member 26, which moves axially rightward, abuts here and stops its movement. Due to this abutment, the second tubular member 26 does not fall out of the first tubular member 25, and
The tip end 29 of the first tubular member protruding from the tip end 28 of the tubular member 26 to the face body 2 side (to the right side in the drawing) is pressed against the peripheral edge of the rubber check valve 15 attached to the intake port 16, 1 The tubular member 25 and the face piece 2 can be kept airtight. The second tubular member 26 has a relatively large operating flange portion 30, which makes it easy to rotate the member 26 and screw it into the intake port 16. Also,
The joint member 5 is the first and second tubular members 2 having such a double structure.
When it is 5, 26, the first tubular member 25 can be fixed to the face piece 2 in the required direction. For example, the member 25
It is easy to fix the later-described pressing members 35A and 35B so that they are always positioned in the vertical direction of the face piece 2. However, when it is not necessary to do so, the member 25 can be directly screwed into the intake port 16.

A flange 31 is provided on the outer periphery of the first tubular member 25 near the second opening 38A, and a holding frame 32 is airtightly joined to the outer edge of the first tubular member 25. By such joining, the holding frame 32 forms another flange juxtaposed with the flange 31. Between the flange 31 and the holding frame 32, there is a pair of upper and lower pressing members 35A and 35B that are slidable toward the center of the pipe. The flange 31, the holding frame 32, and the pressing members 35A and 35B are covered with a stretchable rubber cover 36, and the sliding portion and the gap between the flange 31 and the holding frame 32 are kept airtight. In this example, in order to facilitate the assembly of the joint member 5, the holding frame 32 is prepared as a separate member and is joined to the first tubular member 25. However, the holding frame 32 and the first tubular member are joined together. 25 and
It is also possible to prepare it as an integrated molded product from the beginning.

In the tube of the first tubular member 25, the first opening 3
There is a small diameter portion 37 having 7A and a large diameter portion 38 having a second opening 38A, and both portions 37, 38 are connected via a step portion 39. The large-diameter portion 38 has a long window 38 </ b> B provided by cutting out a part of the peripheral wall, and the pin member 41 described later is used for the window 3.
It projects from 8B into the pipe. Connection pipe for air supply valve 1
8 is slidably fitted to the small diameter portion 37 and the large diameter portion 38 in the circumferential direction, and is connected to the first tubular member 25 in an airtight state by the O-ring 42 being pressed against the peripheral surface of the small diameter portion 37. It is possible. Further, in the large-diameter portion 38, there is an annular groove 40 on the outer circumference of the connecting pipe 18, and a pin member 41 projecting in the pipe can be engaged and disengaged from the radial direction in the annular groove 40.

FIG. 3A is a view taken along the line X--X in FIG. 2. The right half of the drawing shows a state where the rubber cover 36 covers the holding frame 32 and the pressing members 35A and 35B. The left half shows a state in which the cover 36 has been removed. (B) is shown in FIG.
Is a view taken along the line YY of FIG.
The state which engages with A and 35B is shown. It should be noted that the face piece 2 and the air supply valve 4 are not shown in any of the drawings. In FIGS. 3A and 3B, the ends of a pair of elastic pin members 41, which are symmetrical in the left-right direction and the up-down direction and are curved in the left-right direction, engage the pressing members 35A, 35B from the inside. , The pressing members 35A and 35B are urged outward. Pin member 41 protruding from the long window 38B
Crosses the inside of the first tubular member 25 in the vertical direction. When the pair of pressing members 35A and 35B are pressed radially inward by two fingers with two fingers, the pair of pressing members 35A and 35B are guided by the left and right side walls 45 of the holding frame 32 and slide toward each other (FIG. 3 (B)). Along with that, the pin member 4
No. 1 elastically deforms in the direction in which the center-to-center distance d expands, and retreats from the inside of the pipe. When the finger is released, the elastic restoring force of the pin member 41 causes the pressing members 35A and 35B to return to the original state (A). It should be noted that the pressing members 35A and 35B do not retreat from the inside of the pipe by only pressing one of them, because the deformation amount of the pin member 41 is small.

In FIG. 3 (A), when the connecting pipe 18 of the air supply valve 4 is inserted into the second opening 38A, the pair of pin members 41 are once pushed open and then fitted into the engaging groove 40.
The distance D (see FIG. 2) between the left and right engagement grooves 40 is equal to
Since it is slightly larger than the distance d of 1, the fitted connecting pipe 1
The pin 8 is pinched and held by these pin members 41. The connecting pipe 18 does not come off unless the pin member 41 retreats from the inside of the pipe.

In the air respirator 1 thus constructed, when the air respirator 1 is worn, the air supply valve is removed, and instead the second opening 38A is closed by hand, the face piece 2 becomes airtight. When breathing there, exhalation is possible via the exhaust check valve, but inspiration is not possible. Therefore, if inhalation is possible to some extent, the face body 2 is not properly fitted to the face, and there is air leakage somewhere. Further, since the air supply valve 4 is repeatedly attached and detached relatively frequently, the pin member 41 and the pressing member 35A,
Wear of 35B is unavoidable. Even in that case, in the air respirator 1, only the relatively inexpensive joint member 5 needs to be replaced. The air respirator 1 can be used as a face protector when the air supply valve 4 is removed, and can also be used as a gas mask by loading an absorption can at a predetermined portion. There are two types of air supply valves, a pressure demand valve type that constantly maintains positive pressure in the facepiece and a demand valve type that supplies air into the facepiece only during intake. In the present invention, both of them can be used. it can.

[0022]

The air respirator according to the present invention has the following effects. (1) The pin member can be made symmetrical not only in the horizontal direction but also in the vertical direction. By doing so, the clamping force acts relatively evenly around the connecting pipe of the air supply valve, and it does not easily come off from the joint member. (2) Since the pin member is adapted to be detached from the connecting pipe only when the pressing member is simultaneously pressed from the two upper and lower directions,
Even if an external force acts on one of the pressing members, the connecting pipe does not easily come off from the joint member. (3) When the pin member is damaged, only the joint member needs to be replaced, so the maintenance cost of the air respirator can be reduced. (4) Since the joint member is covered with a rubber cover and the required area including the sliding part is made airtight, it is possible to easily determine the presence or absence of air leakage when wearing a face piece, and when using an air respirator. Safety is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an air respirator.

FIG. 2 is a partially enlarged view of FIG.

3A is a view taken along the line XX in FIG. 2, and FIG.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air breathing apparatus 2 Face body 4 Air supply valve 5 Joint member 16 Inlet port 18 Connecting pipe 25 First tubular member 26 Connecting means (second tubular member) 31 First flange (flange) 32 Second flange (holding frame) 35A, 35B Pressing member 36 Cover member (rubber cover) 37A 1st opening 38A 2nd opening 40 Engaging means (annular groove) 41 Elastic member (pin member)

Claims (3)

[Claims] 1. An air respirator comprising a face piece and an air supply valve attachable to and detachable from an intake port of the face piece, wherein a contact member removably engaged with the face piece and the air supply valve is interposed. A first tubular member having the first opening on the side of the face piece and a second opening on the side of the air supply valve; and the first opening removably engaged with an intake port of the face piece. First and second flanges, wherein the first tubular member is arranged in proximity to each other on the outer periphery in the vicinity of the second opening; and the first and second flanges; A pair of pressing members that are sandwiched between the first tubular member and are opposed to each other in the radial direction of the first tubular member, and that are slidable in the vertical direction; and cross the pipe of the first tubular member to the left and right in the radial direction. Are arranged, and the pair of pressing members are simultaneously moved inward in the radial direction. A connection that has at least a pair of elastic members that elastically deform in a direction of retracting from the inside of the pipe when pressed, and the air supply valve is fitted in the first tubular member in an airtight state when inserted from the second opening. A pipe, and an engaging means capable of preventing the elastic member from engaging with the outer circumference of the fitted connecting pipe in the radial direction to prevent the elastic member from being disengaged from the first tubular member. vessel. 2. A required range of the first and second flanges and the pressing member is covered with an air-impermeable elastic cover member.
Air respirator as described. 3. A second connection means, wherein the connection means is fitted to the outside of the vicinity of the first opening of the first tubular member so as to be rotatable in the circumferential direction and non-removable in the axial direction, and can be screwed into the intake port. The air respirator according to claim 1 or 2, which is a tubular member.