Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-06-22
1991-11-05
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
49 13, 200 6162, 335206, G08B 1308
Patent
active
050633724
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 number 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.
REFERENCES:
patent: 700812 (1902-05-01), Peyton
patent: 2386279 (1945-10-01), Tibbetts
patent: 2924682 (1960-02-01), Winterbuen
patent: 2957320 (1960-10-01), Armentrout
patent: 3161742 (1964-12-01), Bagno
patent: 3305805 (1967-02-01), Tann
patent: 3426166 (1969-02-01), Canceill
patent: 3470554 (1969-09-01), Corbell
patent: 3596021 (1971-07-01), Saul
patent: 3707131 (1972-12-01), Massa
patent: 3710369 (1973-01-01), Takahashi
patent: 3761956 (1973-09-01), Takahashi et al.
patent: 3772669 (1973-11-01), Johnston et al.
patent: 3896404 (1975-07-01), Peterson
patent: 3943485 (1976-03-01), Waldman
patent: 3986183 (1976-10-01), Fujiwara
patent: 3996434 (1976-12-01), Griffin
patent: 4160972 (1979-07-01), La Mell et al.
patent: 4216402 (1980-08-01), Engdahl
patent: 4241337 (1980-12-01), Prada
patent: 4438430 (1984-03-01), Young et al.
patent: 4691195 (1987-09-01), Sigelman et al.
patent: 4691363 (1987-09-01), Khanna
patent: 4707684 (1987-11-01), Janke et al.
patent: 4891626 (1990-01-01), Neuman
Ranco Incorporated of Delaware
Swann III Glen R.
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