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Publication numberUS1986088 A
Publication typeGrant
Publication dateJan 1, 1935
Filing dateNov 2, 1933
Priority dateNov 11, 1932
Publication numberUS 1986088 A, US 1986088A, US-A-1986088, US1986088 A, US1986088A
InventorsWild Lanoelet William
Original AssigneeWild Barfield Electr Furnaces
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric oven
US 1986088 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

L. w. WILD ELECTRI C OVEN Jan. 1, 1935;

Filed Nov. 2, 1953 Patented Jan. 1, 1935 amcrmc OVEN I Lancelot William Wild, London, England, assignor to Wild-Barfield Electric Furnaces Limited. London, England, a British company Application November 2, 1933, Serial No. 696,418 In Great Britain November 11, 1932 1 Claim. (o1. sis-3's) This invention relates to electric ovens. Forms of oven have already been employed in which a circulating fan of. the centrifugal type collects. the air within the oven axially and projects it horizontally outwards against the walls of the oven. By using an appropriate fan it was found that-a whirling action could be given to the air'which is thus (assuming that the fan is below the work) caused torise with substantial turbulence effect in whirls past the heaters and it then descends still with considerable turbulence through the work contained in a suitable con- I tainer or basket preferably the fan.

It has now been found that still further increased efllciency is obtainable by using certain specific arrangements in connection with the fan. Broadly the object of the invention is to provide such arrangements, the nature of which and the further more specific objects of the invention 'will'appear from the subsequent description. In particular it seems that undesirable turbulence effects can be avoided and the desired tubulence throughthe work increased by using a revolving plate immediately adjacent to the edges of the fan blades while still leaving the delivery free in all directions radially. It is also found advantageous to place a guiding ring between the basket or the like containing'the work and the fan delivery, this ring extending from the basket close to the fan blades: it is preferably coned to restrict the fan inlet to a circle of approximately one half of the full diameter of the fan and may terminate in a flat plate lying close to and extending preferably beyond the edges of the blades; the central portions of the blades may be tapered towards the center away from the cone and the blades themselves preferably hat and radial and may be two or more in number and of substantial diameter (preferably almost the full diameter of the basket) bringing their edges relatively close to the oven walls.

The invention is illustrated by the accompanying drawing in which Figure 1 is a sectional elevation, and

Figure 2 is a horizontal section through the oven just above the fan.

The oven 1 as shown is of cylindrical shape provided with a heat resisting lining and a cover 2. The electrical heating elements 3 are disposed at intervals near the periphery of the oven and a basket 4 provided with a perforated bottom 5 contains the, work. An outer cylinder 6 prevents immediately above 'and one below the basket. When these indicate ,work into the annular space containing the heatdirect radiationof heat on to the work, and ensures that heating thereof shall take place by convection due to the movement of the air.

The basket 4 and outer cylinder 6 are supported by means of columns 7 and the fan 10, 10a is 5 disposed at the bottom of the oven.

A ring 9 shaped as a frustrum of a cone extends over substantially the whole bottom of the basket and terminates at its lower end in the flat plate 8 which extends out beyond the columns 10 7 and leaves an inlet opening tothe fan of approximately half the full diameter of the latter. The fan has its radial blades 10a rising from a bottom plate 10. The combination of the ring and the bottom plate very largely prevents re- 15 turn currents and loss of efficiency. The central portions of the blades are tapered down towards the bottom at 11 to meet the central boss of the fan and to facilitate the entry of and centrifugal action upon-the air entering the fan.

As shown the fan is driven by an electric motor 12 and a stufling box 13 is provided packed with asbestos or other suitable material. A copper or other good heat conducting disc 14 outside the furnace is arranged upon the motor as shaft so as to dissipate heat coming down the shaft from the oven and prevent it from aifecting the motor or its Two thermo couples 15, 16 are shown one above 30 the same temperature it gives an indication that this is also the temperature of the work since the circulating air is no longer losing heat in, its passage past the work in the basket.

I claim:-

In a furnace, the combination of a basket containing the work and having a reticulated floor, a fan drawing air through the basket, the fan comprising a revolving disc remote from the basket and blades fixed thereto, a duct covering substantially the whole area of the basket-and leading to a restricted area at the center of the fan, a fixed plate at the end of the duct adjacent to the fan extending out to substantially the full diameter of the fan, an outer cylinder surrounding the basket, heating elements in an annular space surrounding the outer cylinder, the delivery of the fan being substantially free in all directions to deliver the air drawn through the ing elements and thence to the opposite end of the basket.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2491420 *Jan 30, 1947Dec 13, 1949Lyons & Co Ltd JOven
US2494022 *Jan 5, 1946Jan 10, 1950GeretyCooking oven
US2561640 *Feb 4, 1949Jul 24, 1951 Electric resistance furnace
US2672548 *Sep 20, 1949Mar 16, 1954Erik Bjorklund GustafElectric heating oven
US3414708 *Oct 22, 1965Dec 3, 1968Malleable Iron Range CompanyForced convection oven
US3465124 *May 20, 1966Sep 2, 1969Burger Eisenwerke AgElectrically heated thawing oven
US3735091 *Dec 17, 1971May 22, 1973Gen ElectricElectrically heated hair curling apparatus
US4062983 *Aug 11, 1976Dec 13, 1977National Equipment CorporationMethod for maintaining heat and moisture in food
US4068572 *Dec 20, 1973Jan 17, 1978Hans VogtApparatus for heating food
US4151400 *Jun 15, 1977Apr 24, 1979Autoclave Engineers, Inc.Autoclave furnace with mechanical circulation
US4247755 *Jan 16, 1978Jan 27, 1981Autoclave Engineers, Inc.High pressure autoclave
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US4771162 *Dec 15, 1986Sep 13, 1988Fkb Feinwerktechnik Und Kunststoffverarbeitungs GmbhApparatus for treating plastic parts for use in dental and orthodontic applications
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US5699722 *Dec 8, 1995Dec 23, 1997Erickson; ChadRapid cooking device
US7834299Aug 9, 2007Nov 16, 2010Enodis CorporationImpingement/convection/microwave oven and method
US7838807Aug 9, 2007Nov 23, 2010Enodis CorporationImpingement/convection/microwave oven and method
US8071922Dec 14, 2005Dec 6, 2011Enodis CorporationImpingement/convection/microwave oven and method
US8093538Aug 9, 2007Jan 10, 2012Enodis CorporationImpingement/convection/microwave oven and method
US20060157479 *Dec 14, 2005Jul 20, 2006Enodis CorporationImpingement/convection/microwave oven and method
US20070278218 *Aug 9, 2007Dec 6, 2007Jan ClaessonImpingement/convection/microwave oven and method
U.S. Classification219/400, 392/363
International ClassificationA47J39/00, H05B3/02
Cooperative ClassificationH05B3/026, F24C15/325
European ClassificationH05B3/02B, F24C15/32B2