US3692967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency heating apparatus having electromagnetic wave agitating device
Assignee: Toshiba Corp
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Filing: 1970-10-06
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Granted: 1972-09-19
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Expires: 1990-10-06
Abstract
Abstract An agitation device for high-frequency electromagnetic waves in a high-frequency oven has at least one pair of planar rotary blades of metal extending in radially opposite directionsfrom a hub part and fabricated, together with the hub part, from a single strip of sheet metal into a staggered or stepped shape in which the blades respectively lie in mutually different offset planes and present minimum profiles with respect to air resistance during rotation, the blades thereby rotating through mutually different paths and imparting effective field agitation to prevent occurrence of a high-frequency standing wave and to render uniform the distributive state of the high-frequency waves applied to the oven interior.
Inventors
- 👤 Tetsuo Hashimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:50
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/74
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
In a high-frequency heating apparatus having means therein defining a heating chamber wherein objects to be heated are placed; a generator operable to generate high-frequency electromagnetic waves and supply same into said heating chamber; and an agitation device for agitating the high-frequency electromagnetic waves comprising a rotatable shaft extending into said heating chamber, rotary drive means connected to said shaft for rotationally driving same, at least two planar blades having high-frequency energy-reflective surfaces connected to said shaft and extending radially outwardly therefrom in axially spacedapart relationship with respect to the shaft axis and cooperative together to effectively agitate the high-frequency electromagnetic waves thereby preventing the formation of highfrequency electromagnetic standing waves within said heating chamber in response to rotation of said shaft, and means positioning said planar blades on said shaft in mutually different parallel planes to present the minimum surface profile with respect to air resistance encountered during rotation of said blades thereby minimizing air drag during operation of the agitating device.
Claim 2
Dependent Claim
163 words
In a high-frequency heating apparatus having means therein defining a heating chamber wherein objects to be heated are placed; a generator operable to generate high-frequency electromagnetic waves and supply same into said heating chamber; and an agitation device for agitating the high-frequency electromagnetic waves comprising a rotatable shaft extending into said heating chamber, rotary drive means connected to said shaft for rotationally driving same, at least two planar blades having high-frequency energy-reflective surfaces connected to said shaft and extending radially outwardly therefrom in axially spacedapart relationship with respect to the shaft axis and cooperative together to effectively agitate the high-frequency electromagnetic waves thereby preventing the formation of highfrequency electromagnetic standing waves within said heating chamber in response to rotation of said shaft, and means positioning said planar blades on said shaft in mutually different parallel planes to present the minimum surface profile with respect to air resistance encountered during rotation of said blades thereby minimizing air drag during operation of the agitating device.
Claim 3
Dependent Claim
30 words
In the apparatus according to claim 1 wherein said last-mentioned means comprises means positioning each of said planar blades on said shaft for rotation in mutually parallel and distinct planes.
Claim 4
Dependent Claim
45 words
In the apparatus according to claim 1; wherein said at least two planar blades comprise a pair of planar blades extending radially outwardly from said shaft in opposite directions; and a hub connecting said pair of planar blades in mutually offset planes to said shaft.
Claim 5
Dependent Claim
24 words
In the apparatus according to claim 3; wherein said hub and pair of planar blades are fabricated from a single strip of sheet metal.
Claim 6
Dependent Claim
52 words
In the apparatus according to claim 1 wherein said at least two planar blades comprise two pairs of planar blades, each pair of planar blades extending radially outwardly from said shaft in opposite directions; and a hub connecting each pair of oppositely extending planar blades in mutually offset planes to said shaft.
Claim 7
Dependent Claim
25 words
In the apparatus according to claim 10; wherein each hub and the planar blades connected thereto are fabricated from a single strip of sheet metal.
Claim 8
Dependent Claim
56 words
In the apparatus according to claim 1; wherein said at least two planar blades comprise a plurality of planar blades extending radially outwardly from said shaft in circumferentially spaced-apart relationship; and wherein said means positioning said planar blades on said shaft comprises meanS positioning said plurality of planar blades for rotation in mutually different horizontal planes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |