| 摘要 |
<p>An alarm system for signalling when a door of a refrigeration unit compartment is not fully closed comprises an alarm condition sensing system having a door sealing gasket magnet (56) and a magnetically actuated switch (74). The gasket magnet (56) produces an elongated narrow magnetic field for coupling the unit and the door in sealing relationship when the door is fully closed. The switch (74) senses the magnetic field when the door is closed even though the magnet position may be anywhere in a band of possible positions. An alarm system (22) signals when a door of a refrigeration unit compartment is not fully closed. The alarm assembly comprises a housing wall section, a vibratable alarm member, and mounting structure for connecting the alarm member to the housing wall section so that the housing wall section is driven by the member and vibrates relative to the housing when the member vibrates at an operating frequency. A plainly audible alarm is produced when a door ajar condition is sensed. <IMAGE> <IMAGE></p> |
