| 摘要 |
A portable sos emergency bell is provided to enable a user to easily carry and conveniently operate the bell due to a simple structure and to attract the attention of persons who exist within the distance of 100m, when the sos emergency bell is operated. A portable sos emergency bell is composed of a valve(4) through which helium gas or nitrogen gas is injected from the outside; a gas tank(5) for storing the helium gas or nitrogen gas; a valve for spraying the gas; record units(1) installed at three spots to make a very high sound with passing the sprayed helium gas through a record pipe; a press switch(2) for operating the sos emergency bell; and a safety pin installed at the press switch to use the sos emergency bell in an emergency state. |
