Abstract:
A snorkel light-emitting device having a light-emitting unit, a float, an inner cap, a circuit board, an upper cap and a button. The light-emitting device is fastened to a topmost portion of a snorkel tube. When a user is diving, the light-emitting device is entirely out of the water, and is so constructed to be absolutely watertight.

Description:
BACKGROUND OF THE INVENTION 
   (a) Field of the Invention 
   The present invention relates to a watertight light-emitting device configured on a snorkel tube, and more particularly to providing an emitting light or flashing light from the snorkel tube for when a diver is floating on the water surface. The light-emitting device is advantageous to the diver by providing a warning sign easily seen by sailing vessels, speeding motorboats or other companions, thereby safeguarding the safety of the diver. 
   (b) Description of the Prior Art 
   Referring to  FIG. 1 , for safety considerations, a typical diver when floating on the water surface adheres a strip of light-reflecting tape  200  around the topmost of the snorkel tube. The reflecting light emanating from the light-reflecting tape  200  relies on sunlight, whereby sailing vessels, speeding motorboats or accompanying companions are enabled to clearly see the location of the diver, thereby safeguarding the safety of the diver, and preventing any sailing vessels or motorboats from colliding with the diver, as well as facilitating companions locating the position of the diver. However, the light-reflecting tape  200  still possesses shortcomings, for example, when being used on cloudy days or at night time when sunlight is lacking, making it impossible to implement the effectiveness of the light-reflecting warning, resulting in accidents often occur whereby the diver is hit by a sailing vessel or speeding motorboat. Difficulties even arise because the diver has lost direction and unable to locate their companions. 
   Referring to prior art U.S. Pat. Nos. 5,622,422, 5,553,606, and 5,701,884, the light-emitting devices are all for usage under the water surface, resulting in the brightness of the emitting light being insufficient for anyone above the surface to notice, and only able to provide sufficient light for companions in the vicinity to see. Moreover, the structure of the aforementioned patents are very simple, only taking into consideration the light-emitting feature of the light bulb or LED, and not enhancing the water proofing effectiveness of the unit itself, thus resulting in the light-emitting device easily faltering or failing upon immersing in the water. 
   SUMMARY OF THE INVENTION 
   The primary objective of the present invention is to provide a light-emitting device attached to a topmost portion of snorkel. The light-emitting device comprises batteries to supply electricity to LEDs. Upon pressing down on a button configured on the head of the light-emitting device, a switch on a circuit board is actuated, thereupon light is emitted through the transparent light-emitting device thereof. The light-emitting device is applicable for usage by divers on cloudy days or when diving at night, whereby a safety warning effectiveness is maintained, thus preventing being hit by sailing vessels or speeding motorboats, and safeguarding the safety of the diver thereof. Moreover, the light-emitting device facilitates fellow companions finding a diver should the diver lose their direction. 
   To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a schematic view of a conventional snorkel system. 
       FIG. 2  shows a schematic view according to the present invention. 
       FIG. 3  shows an exploded elevational view of the light-emitting device according to the present invention. 
       FIG. 4  shows a cross sectional view of the light-emitting device according to the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Referring to  FIGS. 2 ,  3  and  4 , two tapered catches  111  are configured on inner edges of a topmost open-end of a snorkel tube  1 , two catch slots  211  defined in a lower end of a light-emitting unit  21  of a light-emitting device  2  facilitates the catches  111  slotting into thereof, thereby securing the fastening. The main features of the present invention include: 
   A transparent light-emitting device  2  mounted on the topmost portion of a snorkel tube. The light-emitting device  2  comprises and is constructed from a light-emitting unit  21 , a float  22 , an inner cap  23 , a circuit board  24 , an upper cap  25 , and a button  26 . In one section of the light-emitting unit  21  is defined a tubular hole  212 , one side of which is attached a compartment  213  defined to dispose a float  22  therein. The bottom and sidings of the compartment  213  are configured with a plurality of openings  2131 , which facilitate entry of air or water into the float  22  allowing the float  22  to rise upward. The inner cap  23  is designed to be circular in shape, whereby it can be lodged into a circular valve  214  defined in the topmost portion of the light-emitting unit  21 . A cut-off tube  231  is affixed to the lower end of the inner cap  23 , and is designed to fit into the compartment  213 . An air hole  232  is defined in the siding of the cut-off tube  231 , and is configured to orient a passageway with the circular valve  214  and the tubular hole  212 . In case of the snorkel light-emitting device immersing below the water surface, the float  22  thereupon floats upwards and obstructs a hole at the lower end of the cut-off tube  231 , thereby preventing water in the compartment  213  from entering the tubular hole  212  and consequently stopping water from flowing into the mouth of the diver (see  FIG. 4  ). 
   A PC circuit slot  233  defined in a top end of the inner cap  23  is configured for the circuit board  24  to be fitted into thereof. Batteries  241  are installed at the bottom of the circuit board  24  (see FIG.  4 ). A switch  242  and two LED lights  243  are configured on top of the PC circuit  24 . Outer threads  215  configured on outside of an upper section of the light-emitting unit  21  are designed such that inner threads  251  configured on a lower edge of the upper cap  25  can be screwed tight onto thereof. Moreover, a watertight washer  2151  is slipped onto a lower end of the outer threads  215  of the light-emitting unit  21 , thereby preventing water from permeating into the light-emitting unit  21  thereof. A round aperture  252  defined in a topmost of the upper cap  25  is configured to allow a soft, rubber button  26  to protrude and be depressible therein. A lower end of the button  26  is designed to lodge into a disc  253  thereof. The disc  253  can be tightly joined to the upper cap  25  by means of machine thermal compression. Upon depressing the button  26 , a switch  242  is actuated; thereby the LED lights  243  commence emitting light. Pressing the button  26  once more de-actuates the LED lights and turns off their lights thereon. 
   In conclusion, the present invention comprises a watertight light-emitting device configured on the topmost of a snorkel tube, and distinct from the aforementioned cited patents, which are configured, for usage under the water surface. The objective of the present invention is to provide the topmost of a snorkel tube with a device enabled to emit light or strobe lighting for when a diver is on the water surface. On cloudy days or at nighttime when sunlight is lacking, the emitting light facilitates being seen by sailing vessels or speeding motorboats, thereby safeguarding the safety of the diver. 
   It s of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.