1988-04-08
1989-05-16
Joyce, Harold
98105, 98114, F24F 13062
Patent
active
048298867
ABSTRACT:
Guard mechanism comprising a top and bottom having disposed within the top thereof and extending towards the bottom thereof at least one recess, the at least one recess having side walls extending from proximate the top to proximate the bottom of the guard mechanism, the side walls abutting at least one lateral flange proximate the top of the guard mechanism, each lateral flange extending laterally away from the at least one recess proximate the top of the guard mechanism, some of the side walls having disposed therein at least one channel apparatus, each channel apparatus extending from the bottom of the guard mechanism to proximate the top of the guard mechanism and thereat each channel continuing along the extension of a complimentary adjoining laterally extending flange whereat the channel terminates remote the recess; wherein when the guard mechanism is inserted within an inlet or outlet of a ducting system, any contaminants will be prevented from entering said system, but the circulation of air or alternative gasses will be allowed through the channel apparatus disposed within the side walls and flanges of the guard mechanism.
REFERENCES:
patent: 966842 (1910-08-01), Lewis
patent: 1739372 (1929-12-01), Pirchio
patent: 2719476 (1955-10-01), Duvolis
patent: 3469520 (1969-09-01), Fuy et al.
patent: 4338859 (1982-07-01), Claytor
Bolt-Krete Industries Inc.
Hughes Ivor M.
Joyce Harold
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