Regulator with bypass tube

Abstract: Regulator having a bypass tube comprising: a box-like body (1) containing a device (3, 4, 5, 6) for regulating the flow of air; a tube (101) connected to the box-like body and carrying a mouthpiece (8); an air inlet hose (2) connected to the box-like body by means of an inlet valve (6), this valve being controlled by the regulating device; one or more exhaust hoses (102) connected to the box-like body; and a tube (103) which bypasses the chamber (3) of the regulating device. In this type of regulator, the bypass tube is formed integrally within the box-like body (1) of the regulator.

Description: The present invention relates to regulators for underwater breathing apparatus, in particular to regulators having a tube which bypasses the chamber of the air-flow regulating device. Regulators of this type are known in the art and consist, as described for example in US Patent No. 4,002,166, of a regulator comprising a box-like body containing an air-flow regulating device which is connected to an air inlet hose by means of a suitable valve controlled by the said regulating device and in which, downstream of the valve, a tube draws the air from the said inlet hose and conveys it directly to a mouthpiece tube, thereby bypassing the chamber of the flow regulating device. This type of bypass system was designed with the aim of making regulator operation easier. This is achieved because, by bypassing the chamber of the regulating device, a pressure drop is created in a known manner inside the said chamber and this reduces the effort the diver needs to exert in order to inhale since the diaphragm in the regulating device is subjected to a pressure difference that allows it, via a lever, to act on the air inlet valve such that it opens the inlet hose. Regulators of the type described above with reference to US Patent No. 4,002,166 nevertheless have certain disadvantages: the bypass tube through which the air is conveyed from the inlet hose to the mouthpiece is actually outside the box-like body of the regulator, which means that the mouthpiece tube and the air inlet hose need to be fitted with suitable connecting and sealing means in order to be coupled to the said bypass tube, all of which does nothing for the structural compactness of the regulator. The object of the present invention is therefore to provide a regulator in which the air bypass tube is formed integrally within the box-like body of the said regulator, for example by moulding the said box-like body if the latter is made of plastic, thereby avoiding the need for an external bypass tube fitted with sealing and connecting means. This object is achieved by means of a regulator having a bypass tube as defined by claim 1. A better understanding of the invention will be gained by referring to the description of the following embodiments which are given by way of non-limiting example and are illustrated in the appended drawings, in which: Fig. 1 is a view from above in partial cross-section of a first embodiment of the regulator of the present invention; Fig. 2 is a front view of the embodiment of Fig. 1; Fig. 3 is a side view in partial cross-section of a second embodiment of the present invention; Fig. 4 is a view from above in partial cross-section of the embodiment of Fig. 3; Fig. 5 is a view from above in partial cross-section of a third embodiment of the present invention; and Fig. 6 is a front view of the embodiment of Fig. 5. Fig. 1 illustrates a first embodiment of the regulator for underwater breathing apparatus which is fitted with the bypass tube of the present invention. As may be seen, this regulator comprises: a box-like body 1 which can advantageously be made of plastic and which contains a device (3, 4, 5, 6) for regulating the flow of air arriving via an inlet hose 2. This regulating device essentially consists of a chamber 3 having a diaphragm 4 located at the opposite end of the box-like body 1 to the end with the mouthpiece 8; as a result of the pressure difference that is created when the diver inhales, this diaphragm 4 actuates the lever 5, which is coupled in a known manner to the air-flow regulating valve 6, such that the said valve 6 opens the inlet hose 2. The box-like body 1 also comprises an integral tube 101 which couples up with the connector 7 on the mouthpiece 8, this connector 7 being advantageously made of an elastomeric material and being fitted with a sealing ring 9 in order to ensure that the regulator is fully leaktight. The box-like body 1 also comprises an exhaust hose 102, located to the side of the diver's mouthpiece 8, and a bypass tube 103 formed integrally within the box-like body 1, for example by moulding the plastic that forms the said box-like body. As may be seen in the figure, the tube 103 draws air downstream of the regulating valve 6 and conveys it directly to the tube 101 of the mouthpiece 8, thereby bypassing the chamber 3 and creating a pressure drop therein which makes it easier for the rigid part 401 of the diaphragm 4 to act on the lever 5. The regulator also comprises a rigid cover 10 over the diaphragm 4, this cover having an aperture 11 so that the said diaphragm 4 can communicate with the surrounding water in order that the pressure difference needed for the regulating device to work is created across the diaphragm 4. In this embodiment the said cover 10 is fixed to the box-like body 1 by means of pins 13 and, since the ends of the diaphragm 4 are inserted between the box-like body 1 and the cover 10, this ensures that the breathing apparatus is completely leaktight. The regulator also has a conventional purge and control button 12. As may further be seen in Fig. 1, by virtue of the solution provided by the present invention - i.e. forming the bypass tube 103 integrally within the box-like body 1 - the overall form of the regulator is advantageously compact. Fig. 2 illustrates the embodiment of the present invention described above, showing the pins 13 for fixing the cover 10 and the approximately semi-elliptical shape of the aperture 11. Figs 3 and 4 illustrate a second embodiment of the present invention, in which the diaphragm 4 is located at the top relative to the tube 101 of the mouthpiece 8 and lateral to the exhaust hose 102. In addition, the box-like body 1 has a threaded connector 104 onto which the threaded part 14 of the cover 10 is screwed. In this embodiment, the aperture 11 in the cover 10 which allows the diaphragm 4 to communicate with the external surroundings is circular in shape. Fig. 5 shows a further embodiment of the regulator of the present invention, in which the diaphragm 4 is located opposite the mouthpiece 8, which is positioned centrally relative to two exhaust hoses 102 formed integrally within the box-like body 1. As may be seen from the figure, in this embodiment too the threaded part 14 of the cover 10 is screwed onto the threaded connector 104 of the box-like body 1, while the apertures 11 are of a particular shape (Fig. 6). As further shown in Figure 5, the bypass tube 103 is inclined at such an angle with respect to the chamber 3 so as to direct the air straight to the mouthpiece zone 101, thus by-passing the chamber 3. Furthermore, the angle of inclination of said bypass tube 103 is such as to permit to form the bypass tube 103 directly in the mold, by means of a peg P which may be inserted both from the side of the tube 101 of the mouthpiece 8 and/or from the side of the inlet hose 2 As will have been deduced from the detailed description above which refers to the appended drawings, numerous embodiments may be adopted for the regulator of the present invention, the latter not being restricted to those cited by way of non-limiting example, with each of the said embodiments achieving the object of the present invention - i.e. to provide a conventional regulator with a chamber bypass tube which is formed integrally within the box-like body of the regulator, offering the advantages that derive therefrom, according to the appended claims.

Claims: Regulator having a bypass tube comprising: a box-like body (1) containing a device (3, 4, 5, 6) for regulating the flow of air; a tube (101) connected to the said box-like body and carrying a mouthpiece (8); an air inlet hose (2) connected to the said box-like body by means of an inlet valve (6), the said valve being controlled by the said regulating device; one or more exhaust hoses (102) connected to the said box-like body; and a tube (103) which bypasses the chamber (3) of the said regulating device, characterized in that the said bypass tube (103) is formed integrally within the box-like body (1) of the regulator, is external to said chamber (3), and is oriented in such a manner as to direct the air directly to the mouthpiece zone bypassing the interior of the box-like body (1). Regulator according to Claim 1, characterized in that the said box-like body (1) is made of plastic and the said bypass tube (103) is formed by moulding the said box-like body. Regulator according to Claim 1, characterized in that the said regulating device (3, 4, 5, 6) comprises a diaphragm (4) which is located at the front, opposite the said mouthpiece (8) and laterally adjacent to an exhaust hose (102), the cover (10) of the said diaphragm (4) being fixed to the said box-like body (1) by means of pins (13). Regulator according to Claim 1, characterized in that the said diaphragm (4) is located at the top, adjacent to the said mouthpiece (8) and to an exhaust hose (102), the cover (10) of the said diaphragm being screwed by means of its threaded part (14) onto the threaded connector (104) of the said box-like body. Regulator according to Claim 1, characterized in that the said diaphragm (4) is located at the front, opposite the said mouthpiece (8) and centrally relative to two exhaust hoses (102) which are positioned on either side, adjacent to the said diaphragm (4), the cover (10) of the said diaphragm being screwed by means of its threaded part (14) onto the threaded connector (104) of the said box-like body.

Inventors: BELLONI ALBERTO, BELLONI, ALBERTO
Applicants: HTM SPORT SPA, HTM SPORT S.P.A.
Application year: 1999
Main classification: B63C11
IPC codes: B63C11, A62B9