Patent US3847069A successfully refreshed from Google Patents.
US3847069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pizza baking oven with a helical rack and a radially driven impeller
Assignee: Individual
•
Filing: 1972-12-19
•
Granted: 1974-11-12
•
Expires: 1992-12-19
Abstract
Abstract An oven is provided with a support rack in spiral form with an access door thereto at the lower end of the rack, and at least one additional access door for loading articles on the rack. A baking heater is disposed in proximity to the turns of the helical rack while a driven impeller moves in a path spaced radially outwardly from the rack to engage articles which overhang the edge of the track. According to another aspect of the invention, the food products heated by this oven are carried on a round tray that has an open bottom to enable the food article to be baked on both sides at one time. The coaction between the impeller and the support rack causes the tray to rotate about its own axis as it moves along the helical track.
Inventors
- 👤 R Guibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/04; A47J37/046; A21; A21B; A21B1/00; A21B1/02; A21B1/06; A21B1/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
An oven comprising: a. a cabinet having a baking chamber; b. a support rack including means defining a helical track for supporting a circular article to be baked, in a radially outwardly overhanging relation thereon, said helical track having a vertical axis; c. a electrical baking heater disposed in proximity to said rack; and d. a driven impeller movable about said vertical axis in a path which is radially external to said rack but which intersects the overhanging portion of the circular articles, the coaction between said support rack and said impeller on the article causing the article to pass along the helical track about said vertical axis, while simultaneously rotating about its own axis, whereby uniform baking of the article is obtained.
Claim 2
Dependent Claim
123 words
An oven comprising: a. a cabinet having a baking chamber; b. a support rack including means defining a helical track for supporting a circular article to be baked, in a radially outwardly overhanging relation thereon, said helical track having a vertical axis; c. a electrical baking heater disposed in proximity to said rack; and d. a driven impeller movable about said vertical axis in a path which is radially external to said rack but which intersects the overhanging portion of the circular articles, the coaction between said support rack and said impeller on the article causing the article to pass along the helical track about said vertical axis, while simultaneously rotating about its own axis, whereby uniform baking of the article is obtained.
Claim 3
Dependent Claim
45 words
An oven according to claim 1 in which said support rack includes a surface lying in a cylindrical formation at the radially inner edge of said track toward which said track is sloped radially downwardly for being engaged by the perimeter of the circular article.
Claim 4
Dependent Claim
26 words
An oven according to claim 1 in which said track is largely open in a vertical direction, said heater lying between successive turns of said track.
Claim 5
Dependent Claim
34 words
An oven according to claim 1 in which said cabinet has a pair of vertically spaced access doors, one disposed adjacent to the lower end of said track, and the other disposed somewhat higher.
Claim 6
Dependent Claim
19 words
An oven according to claim 2 in which said cylindrical formation is the outer surface of a stationary cylinder.
Claim 7
Dependent Claim
22 words
An oven according to claim 5 in which said track is a rail having radially inwardly directed spokes secured to said cylinder.
Claim 8
Dependent Claim
31 words
An oven according to claim 5 in which said track is a series of roller disposed in a helical pattern and respectively secured by radially inwardly directed spokes to said cylinder.
Claim 9
Dependent Claim
34 words
An oven according to claim 1 in which said helical track extends vertically beyond said baking heater for at least one turn into a region of lower effective temperature for serving as a prehEater.
Claim 10
Dependent Claim
32 words
An oven according to claim 1 including at least one such article comprising a round tray having a substantially fully open bottom for exposing the lower side of its contents to heat.
Claim 11
Dependent Claim
20 words
An oven according to claim 9 in which said tray is annular and has a gutter between its radial peripheries.
Claim 12
Dependent Claim
37 words
An oven according to claim 5 in which said impeller is a series of vertical bars secured to a hub concentric with said axis, said hub being secured to a rotatably driven shaft extending through said cylinder.
Claim 13
Dependent Claim
39 words
An oven according to claim 8 in which said baking heater is arranged to be energized to provide radiant energy to any article in its proximity and to heat air for convection-heating of said region of lower effective temperature.
References Cited (Backward Citations)
US1275203A
Cited
US2438699A
Cited
US2651435A
Cited
US3528363A
Cited
US3601037A
Cited
US3552299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |