US3850003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air defrost air curtain display case
Assignee: Kysor Industrial Corp
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Filing: 1974-04-05
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Granted: 1974-11-26
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Expires: 1994-04-05
Abstract
Abstract A multiple recirculating curtain refrigerated display case specially constructed to achieve low power air defrost. The defrosting function occurs by ambient air being drawn into the innermost passage through both ends, i.e., the air curtain outlet nozzle and the air curtain inlet, then across the refrigeration evaporator unit from both ends, to exhaust conduits near the coil midpoint and blowers forcing the air out through controlled trap doors to the ambient atmosphere.
Inventors
- 👤 S Beckwith
- 👤 W Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:12
CPC Classifications
A; A47; A47F; A47F3/00; A47F3/04; A47F3/0439; A47F3/0443; A47F3/0447; F; F25; F25D; F25D21/00; F25D21/06; F25D21/12; F25D21/125
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
239 words
In an air curtain refrigerated display cabinet, said cabinet having an access opening in one side communicating a storage and display space within the cabinet with the ambient atmosphere, at least two outlet nozzles, an inner one and an adjacent one, extending across the upper edge of the access opening, and corresponding inner and adjacent inlet members extending across the lower edge of said opening; an inner passage and an adjacent passage connecting said inlet members with respective ones of said outlet nozzles; circulating means in each of said passages for circulating panels of air through said passages and across the access opening from said outlet nozzles to said inlet members; refrigeration evaporator coil means in said inner passage for cooling circulated air flowing therepast; the improvement comprising: air defrost means comprising a housing forming at least one plenum chamber; defrost air conduit means from said inner passage, adjacent said evaporator coil means, to said plenum chamber; air discharge outlet means from said plenum chamber to the ambient atmosphere; and air propulsion means operably associated with said plenum chamber, said conduit means, and said discharge outlet means arranged to simultaneously draw ambient defrost air into said inner outlet nozzle and into said inner inlet member, through said inner passage to said evaporator coil means, across said coil means from both directions, through said conduit means to said plenum chamber, and out said discharge outlet means to the ambient atmosphere.
Claim 2
Dependent Claim
239 words
In an air curtain refrigerated display cabinet, said cabinet having an access opening in one side communicating a storage and display space within the cabinet with the ambient atmosphere, at least two outlet nozzles, an inner one and an adjacent one, extending across the upper edge of the access opening, and corresponding inner and adjacent inlet members extending across the lower edge of said opening; an inner passage and an adjacent passage connecting said inlet members with respective ones of said outlet nozzles; circulating means in each of said passages for circulating panels of air through said passages and across the access opening from said outlet nozzles to said inlet members; refrigeration evaporator coil means in said inner passage for cooling circulated air flowing therepast; the improvement comprising: air defrost means comprising a housing forming at least one plenum chamber; defrost air conduit means from said inner passage, adjacent said evaporator coil means, to said plenum chamber; air discharge outlet means from said plenum chamber to the ambient atmosphere; and air propulsion means operably associated with said plenum chamber, said conduit means, and said discharge outlet means arranged to simultaneously draw ambient defrost air into said inner outlet nozzle and into said inner inlet member, through said inner passage to said evaporator coil means, across said coil means from both directions, through said conduit means to said plenum chamber, and out said discharge outlet means to the ambient atmosphere.
Claim 3
Dependent Claim
34 words
The refrigerated display cabinet in claim 1 including trap doors over said air discharge outlet means, said trap doors being normally closed, and shiftable to open condition by air pressure from said propulsion means.
Claim 4
Dependent Claim
19 words
The refrigerated display cabinet in claim 1 wherein said propulsion means comprise a plurality of blowers in said housing.
Claim 5
Dependent Claim
47 words
The refrigerated display cabinet in claim 1 wherein said evaporator coil means has a first end generally oriented toward said inner outlet nozzle and a second end generally oriented toward said inner inlet member; and said defrost air conduits are located intermediate said first and second ends.
Claim 6
Dependent Claim
26 words
The refrigerated display cabinet in claim 4 wherein said defrost air conduits are located closer said first end than said second end of said evaporator unit.
Claim 7
Dependent Claim
53 words
The refrigerated display cabinet in claim 1 wherein said evaporator coil means is located in the rear portion of said cabinet, said housing extends up the rear of said housing to the top, said air discharge outlet means are adjacent the top of said housing, and include air pressure responsive trap doors thereover.
Claim 8
Dependent Claim
75 words
The refrigerated display cabinet in claim 6 including a third outlet nozzle extending across said access opening adjacent to and outwardly of said two outlet nozzles, ambIent air inlets at the top of said cabinet, and passage means with air movement means therein, between said ambient air inlets and said third outlet nozzle: and said trap doors being arranged to open in a direction causing discharge of defrost air away from said ambient air inlets.
Claim 9
Dependent Claim
220 words
In a refrigerated display cabinet having an access opening in one side communicating a storage and display space within the cabinet with the ambient atmosphere, at least two outlet nozzles, an inner one and an adjacent one, extending across one edge of the access opening, and corresponding inner and adjacent inlet members extending across the opposite edge of the opening; an inner passage and an adjacent passage connecting said inlet members with respective ones of said outlet nozzles; circulating means for circulating panels of air through said passages and across the access opening from the outlet nozzles to the inlet members; refrigeration means in the innermost one of said passage means, having one end oriented generally toward said inner inlet member and a second end oriented generally toward said inner outlet nozzle; the improvement comprising: air defrost means for said refrigeration means and said inner passage means, nozzle, and inlet member, comprising exhaust conduit means communicating with said innermost passage means between the ends of said refrigeration means, and suction means communicating with said exhaust conduit means and exhausted to the ambient atmosphere, whereby, with actuation of said suction means, ambient air flows into the innermost outlet nozzle and into the innermost inlet member, through said refrigeration means from opposite directions, through said exhaust conduit means to the ambient atmosphere.
Claim 10
Dependent Claim
220 words
In a refrigerated display cabinet having an access opening in one side communicating a storage and display space within the cabinet with the ambient atmosphere, at least two outlet nozzles, an inner one and an adjacent one, extending across one edge of the access opening, and corresponding inner and adjacent inlet members extending across the opposite edge of the opening; an inner passage and an adjacent passage connecting said inlet members with respective ones of said outlet nozzles; circulating means for circulating panels of air through said passages and across the access opening from the outlet nozzles to the inlet members; refrigeration means in the innermost one of said passage means, having one end oriented generally toward said inner inlet member and a second end oriented generally toward said inner outlet nozzle; the improvement comprising: air defrost means for said refrigeration means and said inner passage means, nozzle, and inlet member, comprising exhaust conduit means communicating with said innermost passage means between the ends of said refrigeration means, and suction means communicating with said exhaust conduit means and exhausted to the ambient atmosphere, whereby, with actuation of said suction means, ambient air flows into the innermost outlet nozzle and into the innermost inlet member, through said refrigeration means from opposite directions, through said exhaust conduit means to the ambient atmosphere.
Claim 11
Dependent Claim
24 words
The refrigerated display cabinet in claim 8 wherein said exhaust conduit means includes portions extending from said innermost passage means through adjacent passage means.
Claim 12
Dependent Claim
43 words
The refrigerated display cabinet in claim 8 including a plenum chamber communicating with said exhaust conduit means and suction means, and trap door means from said plenum chamber, operably associated with said suction means to open only during actuation of said suction means.
Claim 13
Dependent Claim
40 words
The refrigerated display cabinet in claim 8 wherein said suction means constitutes blowers in communication with said exhaust conduit means, and to the ambient atmosphere through trap door means; said trap door means being openable during operation of said blowers.
Claim 14
Dependent Claim
21 words
The refrigerated display cabinet in claim 11 wherein said trap door means are opened by air pressure generated by said blowers.
Claim 15
Independent Claim
97 words
A method of air defrosting the passage and refrigeration means of an air curtain refrigerated display case having an open front with an outlet nozzle from the passage on one edge of the open front and an inlet member to the passage on the opposite edge, comprising the steps of: drawing ambient defrosting air into the passage from opposite directions through the outlet nozzle and through the inlet member, drawing such air across the refrigeration means from opposite ends thereof, and discharging such air intermediate the ends of the refrigeration means and out of the display case.
Claim 16
Independent Claim
97 words
A method of air defrosting the passage and refrigeration means of an air curtain refrigerated display case having an open front with an outlet nozzle from the passage on one edge of the open front and an inlet member to the passage on the opposite edge, comprising the steps of: drawing ambient defrosting air into the passage from opposite directions through the outlet nozzle and through the inlet member, drawing such air across the refrigeration means from opposite ends thereof, and discharging such air intermediate the ends of the refrigeration means and out of the display case.
References Cited (Backward Citations)
US3082612A
Cited
US3403525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |