| 摘要 |
793,159. Respiratory appliances. SIEBE, GORMAN & CO., Ltd. Jan. 2, 1957, No. 233/57. Class 81 (2). In order to avoid flooding of an underwater breathing appliance the mouthpiece is provided with a valve which closes automatically when the mouthpiece is not in use. The usual rubber grip 1, for fitting between the teeth, engages with a metal T-piece 6, the limb 7 of which is connected with the inhalation and exhalation pipes of the appliance. A length of rubber tube 11 fits closely within this limb 7 and seals the outlet passage 5. A bridgepiece 16 is, however, provided which is pressed inward by the teeth when the mouthpiece is in use, so that it pushes the rubber tube clear of the end of the passage 5 and allows normal breathing. |
