| 摘要 |
<p>An alarm device which includes a housing (12), batteries (28, 29, 30) in the housing (12), conductors (41, 42), and a light source (34) and audio signal (32) in parallel to one another and connected to the batteries (28, 29, 30) and switch (50) between the light source (34) and the audio signal (32), in series therewith, and normally opened, yet adapted to be closed by movement of the switch (50) to cause, optionally, a light (34) or an audio signal (32) and, alternatively, an attachment (70) for the housing to provide an alternative circuit with switches (86, 93) in it which is activated by heat, or by closing to a normal position upon release under predetermined conditions to override the signal and to cause an audio signal (32) to warn a person that an intruder has entered a room or that the heat within a given location exceeds a certain predetermined amount.</p> |
