Mouth piece for a breathing apparatus
First Claim
1. A mouth piece for a breathing apparatus, said mouth piece comprising:
- a valve assembly including a valve trigger mechanism arranged to operatively open and close said valve assembly;
a mouth piece housing comprising;
a mouth piece breathing part opening structured to allow inhaling and exhaling a breathable gas by a user,an inlet port structured to allow breathable gas into said mouth piece housing, said inlet port being in communication with said valve assembly arranged to operatively open and close said inlet port,a first exit port structured to allow gas to exhaust from said housing into a closed circuit flow channel, anda second exit port structured to allow gas to exhaust from said housing into an ambient environment; and
a switch assembly to selectively direct said exhaust gas between said first exit port and said second exit port,wherein said switch assembly is further arranged to adjust the opening and closing function of said valve trigger mechanism such that said valve trigger mechanism is activated by a first pressure threshold when said switch assembly is arranged to direct said exhaust gas to said first exit port and a second pressure threshold when said switch assembly is arranged to direct said exhaust gas to said second exit port.
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Accused Products
Abstract
The present invention relates to a mouth piece for a breathing apparatus, a breathing apparatus and a method for adjusting a valve trigger mechanism arranged on a mouth piece for a breathing apparatus. The mouth piece according to the present invention comprises a housing comprising a mouth piece breathing part opening for inhaling and exhaling a breathable gas. An inlet port for providing breathable gas into said mouth piece housing, the inlet port being in communication with valve means arranged to open or close said inlet port. The housing further comprises a first exit port for exhausting gas from said housing into a closed circuit flow channel and a second exit port for exhausting gas from said mouth piece housing into an ambient environment. Switch means for selectively directing said exhaust gas between said first exit port and said second exit port to change the mouth piece between open circuit breathing and closed circuit breathing. The switch means is arranged to adjust the valve means so as to provide an automatic diluent valve function in closed circuit mode and an open circuit regulator in open circuit mode. The mouth piece according to the present invention is compact, light weight and provides for a mouth piece which is very simple to handle.
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Citations
31 Claims
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1. A mouth piece for a breathing apparatus, said mouth piece comprising:
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a valve assembly including a valve trigger mechanism arranged to operatively open and close said valve assembly; a mouth piece housing comprising; a mouth piece breathing part opening structured to allow inhaling and exhaling a breathable gas by a user, an inlet port structured to allow breathable gas into said mouth piece housing, said inlet port being in communication with said valve assembly arranged to operatively open and close said inlet port, a first exit port structured to allow gas to exhaust from said housing into a closed circuit flow channel, and a second exit port structured to allow gas to exhaust from said housing into an ambient environment; and a switch assembly to selectively direct said exhaust gas between said first exit port and said second exit port, wherein said switch assembly is further arranged to adjust the opening and closing function of said valve trigger mechanism such that said valve trigger mechanism is activated by a first pressure threshold when said switch assembly is arranged to direct said exhaust gas to said first exit port and a second pressure threshold when said switch assembly is arranged to direct said exhaust gas to said second exit port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 29, 30, 31)
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24. A mouth piece for a breathing apparatus, said mouth piece comprising:
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a valve assembly including a valve trigger mechanism arranged to operatively open and close said valve assembly; a mouth piece housing comprising; a mouth piece breathing part opening structured to allow inhaling and exhaling a breathable gas by a user, an inlet port structured to allow breathable gas into said mouth piece housing, said inlet port being in communication with said valve assembly arranged to operatively open and close said inlet port, a first exit port structured to allow gas to exhaust from said housing into a closed circuit flow channel, and a second exit port structured to allow gas to exhaust from said housing into an ambient environment; and a switch assembly to selectively direct said exhaust gas between said first exit port and said second exit port so as to switch between a closed circuit and an open circuit, wherein said valve assembly provides an automatic diluent valve function operable in said closed circuit and said valve assembly provides an open circuit regulator function operable in said open circuit, and said switch assembly is arranged to actuate said valve assembly to switch between said automatic diluent valve function and said open circuit regulator function, and wherein said valve assembly is activated by a first pressure threshold when said switch assembly is arranged to direct said exhaust gas to said first exit port and a second pressure threshold when said switch assembly is arranged to direct said exhaust gas to said second exit port. - View Dependent Claims (25, 26, 27)
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28. Method of adjusting the opening and closing function of a valve trigger mechanism in a valve assembly arranged on a mouth piece for a breathing apparatus, the method comprising:
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providing a mouth piece, said mouth piece including a mouth piece housing comprising; a mouth piece breathing part opening structured to allow inhaling and exhaling a breathable gas by a user, an inlet port structured to allow breathable gas into said mouth piece housing, said inlet port being in communication with said valve assembly arranged to open or close said inlet port, a first exit port structured to allow gas to exhaust from said housing into a closed circuit flow channel, and a second exit port structured to allow gas to exhaust from said housing (38) into an ambient environment; and a switch assembly to selectively direct said exhaust gas between said first exit port and said second exit port so as to switch between a closed circuit and an open circuit; and adjusting said valve trigger mechanism by switching said switch assembly of said mouth piece between said first exit port and second exit port such that said valve trigger mechanism is activated by a first pressure threshold when said switch assembly is arranged to direct said exhaust gas to said first exit port and a second pressure threshold when said switch assembly is arranged to direct said exhaust gas to said second exit port.
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Specification