CA1184472A - Breathing protective apparatus - Google Patents
Breathing protective apparatusInfo
- Publication number
- CA1184472A CA1184472A CA000401965A CA401965A CA1184472A CA 1184472 A CA1184472 A CA 1184472A CA 000401965 A CA000401965 A CA 000401965A CA 401965 A CA401965 A CA 401965A CA 1184472 A CA1184472 A CA 1184472A
- Authority
- CA
- Canada
- Prior art keywords
- regulator
- diaphragm
- inhalation
- exhalation
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
- A62B7/02—Respiratory apparatus with compressed oxygen or air
- A62B7/04—Respiratory apparatus with compressed oxygen or air and lung-controlled oxygen or air valves
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/02—Valves
- A62B9/022—Breathing demand regulators
Landscapes
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- Emergency Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improved breathing protective apparatus has an inhalation regulator and a primary source of breathing air supplied to the user through a pressure line. An exhalation regulator with a return line is connected to a vacuum source to remove exhaust gases from the work area. The apparatus has a positive pressure and free flowing regulator which provides an extra measure of safety in a toxic environment and to provide low breathing resistance under high work load conditions. The arrangement is such that if the exhalation regulator is bypassed for exhaust without vacuum conditions, positive pressure and the free flowing regulator is automatically eliminated to save emergency air for escape of the user from a contaminated environment.
An improved breathing protective apparatus has an inhalation regulator and a primary source of breathing air supplied to the user through a pressure line. An exhalation regulator with a return line is connected to a vacuum source to remove exhaust gases from the work area. The apparatus has a positive pressure and free flowing regulator which provides an extra measure of safety in a toxic environment and to provide low breathing resistance under high work load conditions. The arrangement is such that if the exhalation regulator is bypassed for exhaust without vacuum conditions, positive pressure and the free flowing regulator is automatically eliminated to save emergency air for escape of the user from a contaminated environment.
Description
~REATHING PROTFCTIVE APPARATUS
WITH INHALATION AND EXHA~ATION REG~LATOR
Field of the Invention This invention relates to a breathing protective appar-atus used for working in a contaminated or oxygen deficient environment, and in particular to breathing appara~us wherein breathable gas is supplied from a remote place, and exhaust aases are not discharged to the surrounding atmosphere.
Background of the Invention A conventional type of breathing protective apparatus is one wherein breathing gas, usually compressed air, is supplied through a hose to a demand valve connected with the mask of the user. During inhalation, the user receives the required amount of air and then exhaled gas is discharged to the surrounding atmosphere. The breathing mask may be maintained at slightly higher than ambient pressure, preventing inward leakaye of toxic contaminants. However, in a confined environment where a high level of hydrocarbon gases or vapours are present, exhaled gas containing unused oxygen may create a potential explosion hazard.
Problems with the above described type of breathing apparatus is also evident if it must be used in an oxygen free inerted atmosphere as discharge of oxygen into an inerted environment will require an additional costly inerting operation.
In order to increase efficiency in some closed-circuit underwater breathing apparatus, the diver's exhaust gas is pumped back to a bell or submersible unit for CO2 removal, xeconstitution and recirculation. Due to the complexity of such a system, w~ight and high costs, that type of apparatus cannot be utilized as a breathing protective means for wor~ing in a contaminated atmosphere.
In more complex decompression chambers, a special oxygen breathing mask is employed to eliminate a need fcr a high ventilaticr. rate for oxygen removal during oxygen breathing. This type of mask has a common demand valve controlling the oxygen flow during an inhalation, and an exhalation valve connecte~ through a hose and dumping means with an outside decompression chamberO The small exhaust capaci~y of the exhalation valve when used with a vacuum source, and lack of positive pressure in the mask to pre~ent leaks of toxic contaminants, eliminates the possibility of using it for moderate work in atmospheres containing toxic gases or vapours.
The present invention overcomes the above mentioned problems by providing an improved breathing protective apparatus with an inhalation regulator and primary source of breathing air supplied to the user through a pressure line, and an exhalation regulator with a return line connected to a vacuum source to remove exhaust gases from the work area, the apparatus having a positive pressure and free flowing regulator to provide an extra measure of safety in a toxic environment and to provide low breathing resistance under high work load conditions.
Another feature of the invention is to provide a breathing apparatus of the type described, wherein a failure of the supply-r~turn lines will allow a user to switch to an emergency air supply and bypass the exhaust regulator.
~ et another feature is to provide a breathing appar-atus wherein hypassing the exhalation regulator for exhaust without vacuum oonditions will automatically eliminate positive pressure and free flowing regulator to save emergency air for escape from a contaminated environment.
According to a broad aspect the pre~ent invention relates to a breathing protective apparatus including a facemask having a regulator housing incorporating an inlet valve, an inhalation diaphra~m controlling said inlet valve, an exhalation diaphragm and an outlet valve controlled thereby, a supply line connecting said inlet valve with a source of 7~
breathable air pumped under pressure to said valve; a return line connecting said outlet valve with a source of vacuum;
said outlet valve and diaphragm therefor being so arranged that movement towards a closed position exerts a ~orce on inlet valve lever means to create a positive pressure and small free flow in the facemask and regulator housing.
The invention is described with referenece to the accompanying drawings, in which:
Figure 1 illustrates the use of the present invention in an environment with a high level of hydrocarbon gases;
Figure ~ shows a general arrangement of the present nventlon;
Figure 3 is an elevation in cross-section of an embodiment of the present invention;
Figure 4 is a detailed perspective view o the exhaust valve:
Figure 5 is a sectional view showiny the position of the exhaust regulator components without a vacuum; and Figure 6 is a sectional view illustrating the position of the exhaust regulator components when a vacuum is applied to the outlet.
Referring to Figure 1, there is shown a typical environment in which the present invention may be used.
Oil production equipment 10 which is encapsulated in a one-atmosphere pressure subsea chamber 11 and installed on the ocean flor may require an intervention for maintenance or troubleshooting. The access to the chamber 11 is possible through a one-atmosphere service capsule 12 supplied with compressible breathable air and vacuum from a surface support vessel, not sho~n. The atmosphere in the chamber 11 may be inerted to eliminate fire hazard due to a possibilty of hydrocarbon gas leaks. The subsea operator 13 may enter and exit from the chamber throuyh flexible hatches separating atmospheres in the chamber compartments.
Figure 2 shows the breathing apparatus of the present invention worn by an operator 13 and consisting of a face mask 14 with an integrated inhalation/exhalation regulator 15. Breathable air is fed under pressure through an umbilical ~upply line 16, manifold 17 equipped with a check valve and . . .
supply hose 18 into the regulator 15 and facemask 14. The exhaled gas travels back from the mask 14 and regulator 15, return hose l9 through the manifold 17, umbilical return line 20 and up to the topside vacuum source. Compressed air cylinders 21 with a pressure reducing means and suitable valves are provided for an emergency return to the service capsule 12 should a failure occur in the umbilical lines 16,20.
In Figure 3 a typical inhalation regulator 23 is shown with the inlet port 24 closed by a spring loaded poppet valve 25, connected to lever 26 and controlled by an inhalation diaphragm 27 equipped with a check valve 23.
The exhalation r~gulato- 29 has a cylindrical housing 30 with an exhalation diaphragm 31, actuator rod 32, disc 33, spring 34, and an adjustment nut 35 as illustrated in Figure 4. A stem 36 of the exhaust tilt valve 37 is engaged with actuator rod 32 and the disc 33 by means of a U-shaped fork 38.
The exhaust valve 37 is held in the closed position of Figures 3, 4 and 6 by a vacuum in the return hose l9 attached to the exhaust regulator 29 by a connector 39, Figure 3.
The details of the exhaust valve 37 are shown in Figure 4. A cylindrical cavity 40 holding the exhaust valve 37 is closed at its bottom by the return hose bayonet connector 39. By disconnecting the connector 39, an annular passage is formed between the walls of the cavity 40 and the valve body 37. Radiai movements of the valve 37, ensuring over-lapping of the conduit opening 41 in the connector 39, are restricted by pi.ns 42 extending radially outwardly from the valve body 37 and the walls of the cavity 40.
Once the connector 39 is removed from the cavity 40, the axial movement of the valve 37 is restricted by a pin 43 attached to the walls o the cavity 40 and extending diametrically there across passing through an elongated aperture in the valve body 37. ~eferring to Figure 5 it will be seen that the inward and outward movement of the exhalation diaphragm 31 in housing 30 produces a tilting movement of the exhaust valve 37 in the cavity 40.
Figure 5 further illustrates the position of the components Df the exhalation regulator 29 when vacuum is not present in the conduit 41 of the return hose. The exhalation diaphragm 31 is positioned so that the exhaust valve 37 is held in a tilted open position.
In Figure 6 the exhaust regulator 29 is shown wlth vacuum applied to the conduit 41. The suction developed between the valve body 37 and the opening of the conduit 41 overcomes stiffness of the diaphragm 31 and deflects it inwardly of the housing 30. Movement of the diaphragm 31 and the actuator 32 contacts and moves the inhalation diaphragm 27 and lever 26 connected thereto opens the inlet port 24 of th~ inhalation regulator 23 by lifting valve 25 off its seat. With applied supply pressure and worn facemask 14 this in turn creates a flow of air and pressure build-up in the facemask 14 and regulator housing 44. The pressure differential opens a check valve 28 and pressure on the diaphragm increases also in the exhaust housing 30 moving the exhalation diaphragm 31 and the actuator rod 32 outward, terminating activation of the inhalation diaphragm 27 and related inflow. The outward movement of the actuator rod 32 compresses the spring 34 so that the movement does not affect the exhaust valve 37 still kept in the closed position.
Upon exhalat:ion, exhaled gas flows from the facemask through the regulator housing 44, check valve 28, into the exhaust housing 30 applying exhaust pressure on the diaphragm 31.
The outward movement of the diaphragm 31 tilts open the exhaust valve 37 and the exhaled gas is carxied away by the vacuum in the return hose 19. Once the exhaust flow and the corresponding e~haust pressure on the diaphragm 31 ceases, the suction closes valve 37 again causing the positive pressure build~up in the facemask 14.
The level of positive pressure eliminating the risk of contamination leak into the facemask could be set with the adjustment nut 35, Figure 5, and position of the lever 26 in relation to the diaphragm 27.
~i The positive Dressure inside houslng 30 and the related force a~plied on the exhalation diaphragm 31, as well as the force from the elastic deflection of the diaphragm 31, helps to overcome the relatively high initial resistance to the open exhaust valve 37. This arrangement of the regulator 29 permits effortless high volume exhalation. Furthermore, a small continuous flow of air through the facemask 14 an~
exhalation regulator 29 can be adjusted with nut 35 so that the visor of the mask is continuously flushed with fresh air, eliminating mask fogging during work and, even more important, the work of inhalation is greatly reduced.
To prevent ~ possible face s~ueeze, if exhaust valve 37 fails to close, a safety relief valve 45 is built into the exhaust diaphragm 31. A perforated cover 46 has an installed purge button 47, Figure 3, allowing manual actuation of the regulator 15.
If the umbilical supply and return flow through the umbilical lines 16,20 are interrupted, the operator will open the emergency air supPly 21 and disengage the return hose bayonet connector 39 from the exhaust regulator 29. Lack of actuation force from diaphra~m 31 allows use of the emergency air supply on the normal demand mode. Exhaled gas passes through the check valve 28, annulus formed in cavity 40 and is discharged into the surrounding atmosphere.
If necessary, the o~erator can free himself from the umbilical lines by disconnecting the quick disconnects 48,49.
While the invention has been described in connection with a specific embodiment thereof and in a specific use, various modifications thereof will occur to those skilled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.
The terms and expressions which have been employed in this specification are used as terms of description and not of limitation. There is no intention in the use of such terms and expressions to exclude any equivalence of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.
,,
WITH INHALATION AND EXHA~ATION REG~LATOR
Field of the Invention This invention relates to a breathing protective appar-atus used for working in a contaminated or oxygen deficient environment, and in particular to breathing appara~us wherein breathable gas is supplied from a remote place, and exhaust aases are not discharged to the surrounding atmosphere.
Background of the Invention A conventional type of breathing protective apparatus is one wherein breathing gas, usually compressed air, is supplied through a hose to a demand valve connected with the mask of the user. During inhalation, the user receives the required amount of air and then exhaled gas is discharged to the surrounding atmosphere. The breathing mask may be maintained at slightly higher than ambient pressure, preventing inward leakaye of toxic contaminants. However, in a confined environment where a high level of hydrocarbon gases or vapours are present, exhaled gas containing unused oxygen may create a potential explosion hazard.
Problems with the above described type of breathing apparatus is also evident if it must be used in an oxygen free inerted atmosphere as discharge of oxygen into an inerted environment will require an additional costly inerting operation.
In order to increase efficiency in some closed-circuit underwater breathing apparatus, the diver's exhaust gas is pumped back to a bell or submersible unit for CO2 removal, xeconstitution and recirculation. Due to the complexity of such a system, w~ight and high costs, that type of apparatus cannot be utilized as a breathing protective means for wor~ing in a contaminated atmosphere.
In more complex decompression chambers, a special oxygen breathing mask is employed to eliminate a need fcr a high ventilaticr. rate for oxygen removal during oxygen breathing. This type of mask has a common demand valve controlling the oxygen flow during an inhalation, and an exhalation valve connecte~ through a hose and dumping means with an outside decompression chamberO The small exhaust capaci~y of the exhalation valve when used with a vacuum source, and lack of positive pressure in the mask to pre~ent leaks of toxic contaminants, eliminates the possibility of using it for moderate work in atmospheres containing toxic gases or vapours.
The present invention overcomes the above mentioned problems by providing an improved breathing protective apparatus with an inhalation regulator and primary source of breathing air supplied to the user through a pressure line, and an exhalation regulator with a return line connected to a vacuum source to remove exhaust gases from the work area, the apparatus having a positive pressure and free flowing regulator to provide an extra measure of safety in a toxic environment and to provide low breathing resistance under high work load conditions.
Another feature of the invention is to provide a breathing apparatus of the type described, wherein a failure of the supply-r~turn lines will allow a user to switch to an emergency air supply and bypass the exhaust regulator.
~ et another feature is to provide a breathing appar-atus wherein hypassing the exhalation regulator for exhaust without vacuum oonditions will automatically eliminate positive pressure and free flowing regulator to save emergency air for escape from a contaminated environment.
According to a broad aspect the pre~ent invention relates to a breathing protective apparatus including a facemask having a regulator housing incorporating an inlet valve, an inhalation diaphra~m controlling said inlet valve, an exhalation diaphragm and an outlet valve controlled thereby, a supply line connecting said inlet valve with a source of 7~
breathable air pumped under pressure to said valve; a return line connecting said outlet valve with a source of vacuum;
said outlet valve and diaphragm therefor being so arranged that movement towards a closed position exerts a ~orce on inlet valve lever means to create a positive pressure and small free flow in the facemask and regulator housing.
The invention is described with referenece to the accompanying drawings, in which:
Figure 1 illustrates the use of the present invention in an environment with a high level of hydrocarbon gases;
Figure ~ shows a general arrangement of the present nventlon;
Figure 3 is an elevation in cross-section of an embodiment of the present invention;
Figure 4 is a detailed perspective view o the exhaust valve:
Figure 5 is a sectional view showiny the position of the exhaust regulator components without a vacuum; and Figure 6 is a sectional view illustrating the position of the exhaust regulator components when a vacuum is applied to the outlet.
Referring to Figure 1, there is shown a typical environment in which the present invention may be used.
Oil production equipment 10 which is encapsulated in a one-atmosphere pressure subsea chamber 11 and installed on the ocean flor may require an intervention for maintenance or troubleshooting. The access to the chamber 11 is possible through a one-atmosphere service capsule 12 supplied with compressible breathable air and vacuum from a surface support vessel, not sho~n. The atmosphere in the chamber 11 may be inerted to eliminate fire hazard due to a possibilty of hydrocarbon gas leaks. The subsea operator 13 may enter and exit from the chamber throuyh flexible hatches separating atmospheres in the chamber compartments.
Figure 2 shows the breathing apparatus of the present invention worn by an operator 13 and consisting of a face mask 14 with an integrated inhalation/exhalation regulator 15. Breathable air is fed under pressure through an umbilical ~upply line 16, manifold 17 equipped with a check valve and . . .
supply hose 18 into the regulator 15 and facemask 14. The exhaled gas travels back from the mask 14 and regulator 15, return hose l9 through the manifold 17, umbilical return line 20 and up to the topside vacuum source. Compressed air cylinders 21 with a pressure reducing means and suitable valves are provided for an emergency return to the service capsule 12 should a failure occur in the umbilical lines 16,20.
In Figure 3 a typical inhalation regulator 23 is shown with the inlet port 24 closed by a spring loaded poppet valve 25, connected to lever 26 and controlled by an inhalation diaphragm 27 equipped with a check valve 23.
The exhalation r~gulato- 29 has a cylindrical housing 30 with an exhalation diaphragm 31, actuator rod 32, disc 33, spring 34, and an adjustment nut 35 as illustrated in Figure 4. A stem 36 of the exhaust tilt valve 37 is engaged with actuator rod 32 and the disc 33 by means of a U-shaped fork 38.
The exhaust valve 37 is held in the closed position of Figures 3, 4 and 6 by a vacuum in the return hose l9 attached to the exhaust regulator 29 by a connector 39, Figure 3.
The details of the exhaust valve 37 are shown in Figure 4. A cylindrical cavity 40 holding the exhaust valve 37 is closed at its bottom by the return hose bayonet connector 39. By disconnecting the connector 39, an annular passage is formed between the walls of the cavity 40 and the valve body 37. Radiai movements of the valve 37, ensuring over-lapping of the conduit opening 41 in the connector 39, are restricted by pi.ns 42 extending radially outwardly from the valve body 37 and the walls of the cavity 40.
Once the connector 39 is removed from the cavity 40, the axial movement of the valve 37 is restricted by a pin 43 attached to the walls o the cavity 40 and extending diametrically there across passing through an elongated aperture in the valve body 37. ~eferring to Figure 5 it will be seen that the inward and outward movement of the exhalation diaphragm 31 in housing 30 produces a tilting movement of the exhaust valve 37 in the cavity 40.
Figure 5 further illustrates the position of the components Df the exhalation regulator 29 when vacuum is not present in the conduit 41 of the return hose. The exhalation diaphragm 31 is positioned so that the exhaust valve 37 is held in a tilted open position.
In Figure 6 the exhaust regulator 29 is shown wlth vacuum applied to the conduit 41. The suction developed between the valve body 37 and the opening of the conduit 41 overcomes stiffness of the diaphragm 31 and deflects it inwardly of the housing 30. Movement of the diaphragm 31 and the actuator 32 contacts and moves the inhalation diaphragm 27 and lever 26 connected thereto opens the inlet port 24 of th~ inhalation regulator 23 by lifting valve 25 off its seat. With applied supply pressure and worn facemask 14 this in turn creates a flow of air and pressure build-up in the facemask 14 and regulator housing 44. The pressure differential opens a check valve 28 and pressure on the diaphragm increases also in the exhaust housing 30 moving the exhalation diaphragm 31 and the actuator rod 32 outward, terminating activation of the inhalation diaphragm 27 and related inflow. The outward movement of the actuator rod 32 compresses the spring 34 so that the movement does not affect the exhaust valve 37 still kept in the closed position.
Upon exhalat:ion, exhaled gas flows from the facemask through the regulator housing 44, check valve 28, into the exhaust housing 30 applying exhaust pressure on the diaphragm 31.
The outward movement of the diaphragm 31 tilts open the exhaust valve 37 and the exhaled gas is carxied away by the vacuum in the return hose 19. Once the exhaust flow and the corresponding e~haust pressure on the diaphragm 31 ceases, the suction closes valve 37 again causing the positive pressure build~up in the facemask 14.
The level of positive pressure eliminating the risk of contamination leak into the facemask could be set with the adjustment nut 35, Figure 5, and position of the lever 26 in relation to the diaphragm 27.
~i The positive Dressure inside houslng 30 and the related force a~plied on the exhalation diaphragm 31, as well as the force from the elastic deflection of the diaphragm 31, helps to overcome the relatively high initial resistance to the open exhaust valve 37. This arrangement of the regulator 29 permits effortless high volume exhalation. Furthermore, a small continuous flow of air through the facemask 14 an~
exhalation regulator 29 can be adjusted with nut 35 so that the visor of the mask is continuously flushed with fresh air, eliminating mask fogging during work and, even more important, the work of inhalation is greatly reduced.
To prevent ~ possible face s~ueeze, if exhaust valve 37 fails to close, a safety relief valve 45 is built into the exhaust diaphragm 31. A perforated cover 46 has an installed purge button 47, Figure 3, allowing manual actuation of the regulator 15.
If the umbilical supply and return flow through the umbilical lines 16,20 are interrupted, the operator will open the emergency air supPly 21 and disengage the return hose bayonet connector 39 from the exhaust regulator 29. Lack of actuation force from diaphra~m 31 allows use of the emergency air supply on the normal demand mode. Exhaled gas passes through the check valve 28, annulus formed in cavity 40 and is discharged into the surrounding atmosphere.
If necessary, the o~erator can free himself from the umbilical lines by disconnecting the quick disconnects 48,49.
While the invention has been described in connection with a specific embodiment thereof and in a specific use, various modifications thereof will occur to those skilled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.
The terms and expressions which have been employed in this specification are used as terms of description and not of limitation. There is no intention in the use of such terms and expressions to exclude any equivalence of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.
,,
Claims (2)
1. A breathing protective apparatus including an inhalation/exhalation regulator and a facemask, said inhalation/exhalation regulator comprising:
a regulator housing, said housing being connected to and in communication with the facemask;
inhalation regulating means, including an inlet port provided in a wall of the regulator housing, said inlet port being adapted for connection to a supply line to place the regulator housing in communication with a source of breathable air pumped under pressure to the inlet port; inlet valve means adapted to cover the inlet port; inhalation diaphragm means having a first side facing the inlet port and a second side opposite the first side; and inlet valve lever means having a first end connected to the inlet valve means and a second end in contact with the first side of the inhalation diaphragm means; and exhalation regulating means, including a cylindrical housing continuous with the regulator housing; an exhalation diaphragm disposed in the cylindrical housing in juxtaposition to the inhalation diaphragm opposite from the second side of the inhalation diaphragm; actuator rod means concentrically mounted on the side of the exhalation diaphragm facing the inhalation diaphragm and directed toward the inhalation diaphragm; an exhaust port provided in a wall of the cylindrical housing, said exhaust port being adapted for connection to a return line to place the exhaust port in communication with a source of vacuum; outlet valve means comprising a body having a base adapted to cover the exhaust port and a stem extending upwardly from the body adapted to engage the actuator rod means, said outlet valve means being adapted to be held in a port-closing position by the vacuum in the return line, said outlet valve means and said exhalation diaphragm being arranged so that movement of the exhalation diaphragm inwardly of the regulator housing causes a force to be exerted on the inlet valve lever means to lift the inlet valve, thereby uncovering the inlet port.
a regulator housing, said housing being connected to and in communication with the facemask;
inhalation regulating means, including an inlet port provided in a wall of the regulator housing, said inlet port being adapted for connection to a supply line to place the regulator housing in communication with a source of breathable air pumped under pressure to the inlet port; inlet valve means adapted to cover the inlet port; inhalation diaphragm means having a first side facing the inlet port and a second side opposite the first side; and inlet valve lever means having a first end connected to the inlet valve means and a second end in contact with the first side of the inhalation diaphragm means; and exhalation regulating means, including a cylindrical housing continuous with the regulator housing; an exhalation diaphragm disposed in the cylindrical housing in juxtaposition to the inhalation diaphragm opposite from the second side of the inhalation diaphragm; actuator rod means concentrically mounted on the side of the exhalation diaphragm facing the inhalation diaphragm and directed toward the inhalation diaphragm; an exhaust port provided in a wall of the cylindrical housing, said exhaust port being adapted for connection to a return line to place the exhaust port in communication with a source of vacuum; outlet valve means comprising a body having a base adapted to cover the exhaust port and a stem extending upwardly from the body adapted to engage the actuator rod means, said outlet valve means being adapted to be held in a port-closing position by the vacuum in the return line, said outlet valve means and said exhalation diaphragm being arranged so that movement of the exhalation diaphragm inwardly of the regulator housing causes a force to be exerted on the inlet valve lever means to lift the inlet valve, thereby uncovering the inlet port.
2. A protective apparatus according to claim 1 including a cylindrical cavity retaining the base of said outlet valve; means on the outlet valve body restricting radial movement thereof; a pin secured in and extending diametrically across the cylindrical cavity and passing through the valve body to restrict axial movement thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34887182A | 1982-02-16 | 1982-02-16 | |
| US348,871 | 1982-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1184472A true CA1184472A (en) | 1985-03-26 |
Family
ID=23369916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000401965A Expired CA1184472A (en) | 1982-02-16 | 1982-04-29 | Breathing protective apparatus |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0087034A1 (en) |
| JP (1) | JPS58221959A (en) |
| CA (1) | CA1184472A (en) |
| NO (1) | NO830483L (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2233237A (en) * | 1989-06-27 | 1991-01-09 | Aran Fire & Safety Uk | Valve for breathing apparatus |
| NO174836C (en) * | 1990-04-03 | 1994-07-20 | Ottestad Nils T | Breathing system for smoke diving and the like. |
| US5537995A (en) * | 1990-04-03 | 1996-07-23 | Den Norske Stats Oljeselskap A.S. | Breathing system having breathing bag and supplemental gas dosing controls |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2085249A (en) * | 1933-10-02 | 1937-06-29 | Bullard Co | Respirator |
| US2418034A (en) * | 1943-05-29 | 1947-03-25 | Gen Electric X Ray Corp | Respiration apparatus |
| FR1438515A (en) * | 1965-04-01 | 1966-05-13 | Spirotechnique | Device for the evacuation of gases exhaled by the user of a breathing apparatus |
| US3468307A (en) * | 1966-10-26 | 1969-09-23 | Carleton Controls Corp | Intermittent positive pressure breathing apparatus |
-
1982
- 1982-04-29 CA CA000401965A patent/CA1184472A/en not_active Expired
-
1983
- 1983-02-05 EP EP83101096A patent/EP0087034A1/en not_active Withdrawn
- 1983-02-07 JP JP58017563A patent/JPS58221959A/en active Pending
- 1983-02-14 NO NO830483A patent/NO830483L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58221959A (en) | 1983-12-23 |
| NO830483L (en) | 1983-08-17 |
| EP0087034A1 (en) | 1983-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |