Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1990-06-22
1991-12-03
Swann, III, Glen R.
Communications: electrical
Audible indication
Ultrasonic pest control
310323, 340547, 340691, G08B 2100, G08B 300
Patent
active
050703196
ABSTRACT:
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 and a magnetically actuated switch. The gasket magnet produces an elongated narrow magnetic field for coupling the unit and the door in sealing relationship when the door is fully closed. The switch 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 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.
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Ranco Incorporated of Delaware
Swann III Glen R.
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