US3149476A - Refrigerated display cabinet - Google Patents

Refrigerated display cabinet Download PDF

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Publication number
US3149476A
US3149476A US198962A US19896262A US3149476A US 3149476 A US3149476 A US 3149476A US 198962 A US198962 A US 198962A US 19896262 A US19896262 A US 19896262A US 3149476 A US3149476 A US 3149476A
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US
United States
Prior art keywords
heating means
panels
refrigerated
innermost
passages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US198962A
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English (en)
Inventor
Beckwith Sterling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dual Jet Refrigeration Co
Original Assignee
Dual Jet Refrigeration Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dual Jet Refrigeration Co filed Critical Dual Jet Refrigeration Co
Priority to US198962A priority Critical patent/US3149476A/en
Priority to GB17995/63A priority patent/GB965881A/en
Priority to CH673663A priority patent/CH405375A/de
Priority to DK258463AA priority patent/DK117780B/da
Priority to DE19631451072 priority patent/DE1451072A1/de
Application granted granted Critical
Publication of US3149476A publication Critical patent/US3149476A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0439—Cases or cabinets of the open type
    • A47F3/0443—Cases or cabinets of the open type with forced air circulation
    • A47F3/0447—Cases or cabinets of the open type with forced air circulation with air curtains

Definitions

  • This invention relates to improvements in a refrigerated cabinet or enclosure of the type having an open side permitting access to an enclosed refrigerated space.
  • the invention particularly relates to devices of the type which are capable of maintaining a refrigerated state within the enclosed space while still providing an opening for access to the contents.
  • assemblies which include nozzles extending across the bottom edge of the access opening to direct the air panels upwardly across the opening towards inlets which extend across the top side of the access opening.
  • the nozzles are located across the upper edge for projecting the air panels downwardly toward inlets arranged across the bottom edge. It is also contemplated that the air nozzles be located across one of the lateral edges of the opening for directing the corresponding air panels across the opening toward inlets in the opposite edge. Because of the more desirable effect of gravity on the higher density cold air, it has been found preferable to provide the air curtain with a downward movement from nozzles across the top to inlets across the bottom. The following description will refer to this preferred construction, although it will be understood that the concepts to be described are also applicable to other directions of flow.
  • honeycomb sections for the nozzles used to direct the air panels across the access opening.
  • honeycomb sections are characterized by a plurality of small openings and, when employed in lengths from about 1 to about 6 inches, they 3,149,476 Patented Sept. 22., 1964 are particularly effective in providing uniformity in the laminar air panels.
  • FIGURE 1 is a schematic elevation, partly cut away, of a refrigerated enclosure characterized by the features of this invention
  • FIGURE 2 is a fragmentary view in section of the nozzle area of a refrigerated cabinet having associated heating means
  • FIGURE 3 is a detail plan view of the heating means employed in the nozzle area.
  • the improvements of this invention are directed to refrigerated enclosures of the type which define an access opening in one wall which is provided for communication with the otherwise enclosed space.
  • the enclosures are provided with a plurality of nozzles arranged in side-by-side relationship across one edge of an access opening and corresponding inlets are located across an opposite edge of the access opening.
  • the inner nozzles and inlets are provided for the passage of refrigerated air streams across the access opening, while the outer nozzles and inlets circulate progressively warmer air panels.
  • the refrigerated streams are circulated through passages having refrigeration coils or the like situated therein, and one or more of the outer streams may also be refrigerated.
  • the problem of undue frost formation and accumulation is particularly apparent in the innermost refrigerated stream or streams, and the accumulation appears to occur with greater regularity in the area of the outlet nozzles for these refrigerated streams. It has been found that the provision of heating means in me path of the refrigerated streams adjacent the nozzle areas serves to effectively reduce the frost formation and accumulation.
  • the refrigerated streams contact these heating means prior to contact with the outlet nozzles.
  • the heating means which are of relatively low capacity, serve to raise the temperature of the stream a small amount in the nozzle area, and this inhibits the frost formation.
  • the heating means located adjacent the nozzle for this stream may be adapted to raise the temperature to 15 F.
  • the heating means comprises a framemember which extends across I of turns around the frame.
  • a thin wire is preferably employed, and the turns are preferably uniformly spaced apart asubstantial amount when compared with the thickpanel.
  • the concepts of this invention are particularly applicable where honeycomb sections are usedas the nozzle means.
  • the heating means described when employed in combination with these sections, generate heat to a degree sufiicient to raise the temperature of the innermost refrigerated panel or panels thereby inhibiting frost formation on the exposed surfaces of the honeycomb sections.
  • the accompanying drawings illustrate a refrigerated cabinet 19 which is provided with the improvements which form the subject matter of this invention.
  • the enclosure comprises a top wall 12, bottom wall 14, back wall'lfi, front wall 18 and side walls 20.
  • the front wall 18 defines an opening 22 for access to the refrigerated space'24.
  • An internal wall 26 defines the extent of the refrigerated space.
  • Partitions 23 and 30 and the inner and outer walls define passages 32, 34 and 36. These passages confine streams 38, 4t) and 42 which then form laminar air panels as they cross the access opening.
  • refrigeration coils 33 and circulating means 35 Located in the passages in the bottom area of the cabinet there are provided refrigeration coils 33 and circulating means 35 as disclosed in the'prior applications.
  • At least the innermost panel 38 is to be refrigerated, al-' though refrigeration means can be provided for the other panels.
  • the concepts of this invention contemplate the use of two or more panels, and the invention is not necessarily limited to the three panels shown. Circulating means are provided for the innermost panel, and preferably are provided for all of the panels, although in some instances the outermost panel can be efliciently circulated without specific mechanical aid.
  • Screens 44 are provided in the path of the outer panels 40 and 42 to prevent entry of insects and other foreign material into the air passages.
  • a similar screen may be provided over the passage 32.
  • a heating element 46 of the type described in the copending application Serial No. 198,963, dated May 31, 1962, and entitled Refrigerated Enclosure, can be advantageously substituted for the screening means.
  • Outlet nozzles 48 for the air streams are located at the top edge of the access opening.
  • frost there is a tendency for frost to collect in these areas, particularly in the innermost refrigerated passage 32. It has been discovered that the accumulation of frost can be effectively reduced if a heating means 50 is located in the air passage adjacent the nozzle 48. This heating means is positioned to contact the stream 32 priorto passage of the stream through the nozzle.
  • the heating means 50 is shown only in the passage 32, it will be appreciated that the concepts of this invention are applicable to all of the nozzle areas where undue frost'accurnulation presents problems.
  • the heating means 54 shown comprises a rectangular frame. member 52 which may be suspended across the air. passage and:secured to the side walls of the cabinet 'bymeans o f'b'racket members 54.. To provide rigidity in the frame, braces 56 are employed.
  • An electrical resister wire 58 is formed in a plurality
  • the wire may be of any mass of the-wire. This arrangement permits uniform dis- V tribution of heat without unduly interrupting the flow of the air panels.
  • J Thin plastic coated wire wound around a steel frame with about one inch between turns has been found to be a suitable construction, although many vari- The use of theheating 59in thejnozzle area is ations in this respect will be obvious to those skilled in the art.
  • honeycomb sections of the type illustrated comprise the nozzles 48.
  • the combination of the small passages in these sections as well as the large surface area presented accentuates the frost problem. It has been found that the use of heating means of the type described provides noticeable increases in the effectiveness and efficiency of operation of the refrigerated cabinets.
  • a refrigerated cabinet defining an a'ccess opening in one wall communicating the otherwise enclosed space with the outside atmosphere, outlets across one side of said access opening and inlets across the other side of the access opening, means for circulating a plurality of air panels from the outlets to the inlets across said opening and through separate passages about said enclosure, and means for refrigerating at least the innermost one of said panels, the improvement comprising heating means disposed in the passages confining said innermost panel, said outlet comprising honeycomb sections extending across each of said passages immediately in advance of the inlet of said heating means being located immediately in ad- Vance of the inlet end of the outlet for said panel at one edge of said access opening, and said heating means being adapted to generate heat to raise the temperature of said innermost panel thereby inhibiting frost formation.
  • At least one inner cold provement comprising heating means in the passage con-' fining the said innermost refrigerated panel, said nozzles comprising honeycombsections extend ng across each of said passages, saidheating means being disposed immediately in advance of the inlet'end of the nozzles for said' passages,.and said heating means being adaptedto' generate heat to raise the temperature of said' innermost panels thereby inhibiting frost formation.
  • a refrigerated cabinet defining an accessopening in one wall communicating the otherwise enclosed space with the outside atmosphere, means for circulating a plurality of air panels acrossjsaid opening and through said enclosure, and means for refrigerating at least the inner-,
  • the improvement comprising a honeycomb section extending across each'of said passagesforming outlet nozzlesfor said panels at one edge of 'saidaccess opening, a heating means disposed immediately in advanceof the inlet end of the honeycomb sectionin the passage confining said innermost panel, said heating'means' being adapted to generate heat to raise the temperature of said innermost panel thereby inhibiting frost formation.
  • a refrigerated cabinet of the type which defines an access opening in one wall communicating an otherwise enclosed space with the ambient atmosphere, and which is provided with at least one inner cold air inlet and at least one outer warmer air inlet, at least one inner cold air nozzle and at least one outer warmer air nozzle, said inlets and nozzles extending in side-by-side relationship across opposite edges of said access opening, passages communicating each of the corresponding inlets and nozzles, circulating means in at least some of the passages for forcing air through the passages in the form of panels across said access opening, and refrigeration means disposed in at least some of said passages and adapted to refrigerate at least the innermost of said panels, the improvement comprising heating means in the passage confining the said innermost refrigerated panel, said heating means comprising a frame member suspended in and extending across said passage adjacent said nozzle, and an electrical resister wire wrapped around said frame member along the length thereof, said heating means being disposed adjacent the nozzie for said passage, and said heating means being adapted to generate heat to raise
  • a refrigerated cabinet defining an access opening in one wall communicating the otherwise enclosed space with the outside atmosphere, means for circulating a pinrality of air panels across said opening and through said enclosure, and means for refrigerating at least the innermost one of said panels, the improvement comprising heating means disposed in the passages confining said innermost panel, said heating means comprising a frame member suspended in and extending across said passage, and a plurality of spaced apart turns of an electrical resister Wire wrapped around said frame member along the length thereof, said heating means being located adjacent the outlets for said panel at one edge of said access opening, and said heating means being adapted to generate heat to raise the temperature of said innermost panel thereby inhibiting frost formation.
  • a refiigerated cabinet defining an access opening in one wall communicating the otherwise enclosed space with the outside atmosphere, means for circulating a plurality of air panels across said opening and through said enclosure, and means for refrigerating at least the innermost one of said panels, the improvement comprising a honeycomb section extending across each of said passages forming outlet nozzles for said panels at one edge of said tccess opening, a heating means disposed above the honey- :omb section in the passage confining said innermost panel, said heating means comprising a frame member suspended in and extending across said passages, and a plurality of spaced apart turns of an electrical resister wire wrapped around said frarne member along the length thereof, and said heating means being adapted to generate heat to raise the temperature of said innermost panel thereby inhibiting frost formation.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
US198962A 1962-05-31 1962-05-31 Refrigerated display cabinet Expired - Lifetime US3149476A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US198962A US3149476A (en) 1962-05-31 1962-05-31 Refrigerated display cabinet
GB17995/63A GB965881A (en) 1962-05-31 1963-05-07 Improvements in or relating to refrigerated cabinets
CH673663A CH405375A (de) 1962-05-31 1963-05-29 Kühltruhe
DK258463AA DK117780B (da) 1962-05-31 1963-05-30 Køleskab med en adgangsåbning, tværs over hvilken strømmende luft danner et flerlags lufttæppe.
DE19631451072 DE1451072A1 (de) 1962-05-31 1963-05-31 Kuehlfach

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US198962A US3149476A (en) 1962-05-31 1962-05-31 Refrigerated display cabinet

Publications (1)

Publication Number Publication Date
US3149476A true US3149476A (en) 1964-09-22

Family

ID=22735620

Family Applications (1)

Application Number Title Priority Date Filing Date
US198962A Expired - Lifetime US3149476A (en) 1962-05-31 1962-05-31 Refrigerated display cabinet

Country Status (5)

Country Link
US (1) US3149476A (de)
CH (1) CH405375A (de)
DE (1) DE1451072A1 (de)
DK (1) DK117780B (de)
GB (1) GB965881A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324783A (en) * 1965-05-19 1967-06-13 Clark Equipment Co Air directing grid construction
JPS515394U (de) * 1974-06-28 1976-01-16
JPS5141995U (de) * 1974-09-25 1976-03-29
JPS51128045A (en) * 1975-04-30 1976-11-08 Sanyo Electric Co Ltd Refrigerator show-case
JPS51152174U (de) * 1975-05-29 1976-12-04
JPS5385665U (de) * 1976-12-14 1978-07-14
JPS5387466U (de) * 1976-12-20 1978-07-18
US4122685A (en) * 1977-03-29 1978-10-31 St. Onge, Ruff & Associates, Inc. Elevator shaft
JPS56126092U (de) * 1980-02-26 1981-09-25
US4302948A (en) * 1979-09-06 1981-12-01 Tyler Refrigeration Corporation Refrigerated display case having a unitary outlet grid
US4466254A (en) * 1982-07-06 1984-08-21 Masashi Karashima Refrigerated showcase
JPS6092079U (ja) * 1983-11-29 1985-06-24 富士電機株式会社 冷気循環形オ−プンシヨ−ケ−ス
US5927095A (en) * 1997-05-20 1999-07-27 Lg Electronics, Inc. Anti-frost device for refrigerators
US11473367B2 (en) * 2018-01-31 2022-10-18 Lite-On Electronics (Guangzhou) Limited Shutter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148079U (de) * 1974-12-27 1976-11-27
JPS54819Y2 (de) * 1974-12-27 1979-01-17

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952992A (en) * 1958-11-06 1960-09-20 C V Hill & Company Inc Refrigerated shelf
US3063252A (en) * 1961-08-17 1962-11-13 Lamb Frank Gilbert Upright refrigerator showcase

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952992A (en) * 1958-11-06 1960-09-20 C V Hill & Company Inc Refrigerated shelf
US3063252A (en) * 1961-08-17 1962-11-13 Lamb Frank Gilbert Upright refrigerator showcase

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324783A (en) * 1965-05-19 1967-06-13 Clark Equipment Co Air directing grid construction
JPS515394U (de) * 1974-06-28 1976-01-16
JPS5141995U (de) * 1974-09-25 1976-03-29
JPS51128045A (en) * 1975-04-30 1976-11-08 Sanyo Electric Co Ltd Refrigerator show-case
JPS51152174U (de) * 1975-05-29 1976-12-04
JPS5385665U (de) * 1976-12-14 1978-07-14
JPS5387466U (de) * 1976-12-20 1978-07-18
US4122685A (en) * 1977-03-29 1978-10-31 St. Onge, Ruff & Associates, Inc. Elevator shaft
US4302948A (en) * 1979-09-06 1981-12-01 Tyler Refrigeration Corporation Refrigerated display case having a unitary outlet grid
JPS56126092U (de) * 1980-02-26 1981-09-25
US4466254A (en) * 1982-07-06 1984-08-21 Masashi Karashima Refrigerated showcase
JPS6092079U (ja) * 1983-11-29 1985-06-24 富士電機株式会社 冷気循環形オ−プンシヨ−ケ−ス
US5927095A (en) * 1997-05-20 1999-07-27 Lg Electronics, Inc. Anti-frost device for refrigerators
US11473367B2 (en) * 2018-01-31 2022-10-18 Lite-On Electronics (Guangzhou) Limited Shutter

Also Published As

Publication number Publication date
CH405375A (de) 1966-01-15
DE1451072A1 (de) 1969-03-13
GB965881A (en) 1964-08-06
DK117780B (da) 1970-06-01

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