SELF-CONTAINED BREATHING SYSTEM

• US 20120138059A1
• Filed: 02/13/2012
• Published: 06/07/2012
• Est. Priority Date: 08/22/2003
• Status: Active Grant

• Current Assignee: Wilcox Industries Corp.
• Original Assignee: Wilcox Industries Corp.
• Inventors: Teetzel, James W., Lemire, Gary M., Desrosiers, Daniel A., Hansen, Mark A.
• Granted Patent: US 8,950,401 B2
• Time in Patent Office: Days
• US Class Current: 128/205.12
• CPC Class Codes: A61M 16/105 Filters A61M16/047, A61M16/22 take precedence; water traps A61M16/08
• CPC Class Codes: A62B 18/006 with pumps for forced ventilation A62B18/045 takes precedence
• CPC Class Codes: A62B 18/02 Masks gas-masks for animals A62B18/06; masks for welders A61F9/06
• CPC Class Codes: A62B 18/10 Valves
• CPC Class Codes: A62B 7/02 with compressed oxygen or air
• CPC Class Codes: A62B 7/10 with filter elements
• CPC Class Codes: A62B 7/12 with fresh-air hose
• CPC Class Codes: A62B 9/006 Indicators or warning devices, e.g. of low pressure, contamination
• CPC Class Codes: A62B 9/04 Couplings; Supporting frames

Abstract

A breathing apparatus is operable in self-contained and filtered modes of operation. In the self-contained mode of operation, a breathable gas is delivered to a user from a self-contained source of breathing gas. In a second, filtered mode of operation, a suction source draws ambient air through a filter removing contaminants and delivers filtered ambient air to the user. A method of delivering air to a subject is also provided.

Claims

1-62. -62. (canceled)

63. A breathing hose assembly for delivering a breathing gas to a user, comprising:

an inner perforated hose extending from a first end of the breathing hose assembly to a second end of the breathing hose assembly; and

an outer flexible bag surrounding the inner perforated hose, the outer flexible bag being inflatable to hold a volume of air for subsequent delivery to the user.

64. The breathing hose assembly of claim 63, further comprising:

a face mask fluidically coupled to the second end of the breathing hose assembly.

65. The breathing hose assembly of claim 64, further comprising:

an outlet valve on said face mask, said outlet valve configured to retain the breathing gas within the mask when pressure within the mask is below a preselected threshold valve and to allow gas to escape the mask when pressure within the mask is greater than or equal to the threshold value.

66. The breathing hose assembly of claim 65, wherein the outlet valve is configured to maintain a pressure within the mask which is greater than atmospheric pressure.

67. A breathing apparatus, comprising:

a conduit defining a passageway for a breathable gas having a first inlet for receiving breathable gas from a pressurized source of breathing gas, a second inlet for receiving filtered ambient air, and an outlet for delivering breathable gas to a user;

a suction source in fluid communication with said second inlet for drawing ambient air into said passageway;

a main filter assembly positioned between said second inlet and said passageway for removing contaminants from said ambient air;

a prefilter assembly positioned upstream of the main filter assembly, said prefilter assembly including one or more filters, said prefilter assembly including a housing receiving said one or more filters, said prefilter housing movable between a closed position wherein said second inlet is closed to ambient air and an open position wherein said second inlet is open to ambient air;

a pneumatically operated piston reciprocally movably within a cylinder, said piston mechanically coupled to said prefilter housing;

a normally closed passage extending between said cylinder and the pressurized source of breathing gas; and

a valve for selectively opening said normally closed passage to deliver pressurized breathing gas to said cylinder, wherein when the prefilter housing is in the open position, the pressurized breathing gas delivered to the cylinder causes the prefilter housing to be moved to the closed position and wherein when the prefilter housing is in the closed position, the pressurized breathing gas delivered to the cylinder causes the prefilter housing to be moved to the open position.

68. The breathing apparatus of claim 67, further comprising:

one or more self-contained sources of breathing gas removably attached to said passageway and selectively fluidically coupled to said first inlet.

69. The breathing apparatus of claim 67, wherein said normally closed valve is a solenoid valve.

70. The breathing apparatus of claim 67, wherein said main filter assembly is positioned between said second inlet and said suction source.

71. The breathing apparatus of claim 67, wherein the passageway is sealed against entry of one or both of water and environmental contamination when the prefilter housing is closed.

72. The breathing apparatus of claim 67, further comprising:

a face mask adapted to be worn over a user'"'"'s face and having a connection port; and

an air hose having a first end removably connected to said face mask connection port and a second end opposite the first end removably connected to said outlet;

73. The breathing apparatus of claim 72, further comprising one or both of:

a purge valve connected to said first end of said air hose, the purge valve fluidically connected to said first stage regulator and manually actutable to provide a burst of regulated air from a first stage regulator; and

an alarm system for providing a user-perceptible alert when a pressure of the self-contained breathing system falls below a preselected value.

74. The breathing apparatus of claim 72, wherein said air hose comprises an inner perforated hose for delivering air to a user and an outer flexible bag which is inflatable to hold a volume of air for subsequent delivery to the user.

75. The breathing apparatus of claim 67, further comprising:

an actuator for activating the suction source when the prefilter housing is in the second position and deactivating the suction source when the prefilter housing is in the first position.

76. The breathing apparatus of claim 67, further comprising:

a pressure sensor for detecting a pressure indicative of a quantity of gas remaining in the self-contained source of breathing gas; and

said valve operable under programmed control responsive to detected pressure reaching a preselected minimum threshold value.

77. The breathing apparatus of claim 67, wherein said one or more filters includes:

a first filter formed of a woven nylon material; and

a second filter formed of a mesh filtration medium.

79. The breathing apparatus of claim 67, further comprising:

a pressure regulator for receiving pressurized gas at a first pressure and outputting the gas at a second pressure lower than the first pressure;

said valve in fluid communication with said pressure regulator.

80. The breathing apparatus of claim 67, wherein the main filter is selected from a chemical, radiological, or biological filter, or any combination thereof.

81. The breathing apparatus of claim 67, further comprising:

said conduit defining a passageway including a housing defining an internal cavity, the internal cavity providing a reservoir of breathable gas.