US4845327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven having automatic bread making function
Assignee: Hitachi Global Life Solutions Inc
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Filing: 1988-11-15
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Granted: 1989-07-04
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Expires: 2008-11-15
Abstract
Abstract Disclosed is a microwave heating apparatus which comprises a turntable for reducing the irregularity of heat with the rotation movement of a subject to be heated within a heat chamber, a bread casing used for automatically performing an entire process of kneading raw ingredients, fermentation, gas escape, baking and the like, a first driving shaft made of a metal pipe and provided to drive a kneading blade mounted within the bread casing, and a second driving shaft made of a microwave-permeable dielectric substance provided to drive the turntable, the second shaft being arranged to pierce a hollow portion of the first driving shaft. According to the aforementioned construction, the turntable and the kneading blade can be effectively driven by the respective optimum motors. A choke cavity and a disk shaped conductive plate prevent microwave energy from leaking out of the heat chamber along the respective driving shafts.
Inventors
- 👤 Koji Iwabuchi
- 👤 Masaharu Tawada
- 👤 Noriyuki Kanagawa
- 👤 Mituhiro Aoyama
- 👤 Katsuhiro Yamazaki
- 👤 Kazuo Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:25
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6408; H05B6/6411
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A microwave oven assembly for preparing a plurality of different foods selectively, comprising: a heating chamber, including a bottom surface having a substantially central opening, for enclosing the foods during preparation; a microwave oscillator for generating a first type of energy within the chamber; a heating element for generating a second type of energy effective to heat the chamber; a first rotatably mounted hollow shaft aligned with the central opening perpendicular to the plane of the bottom surface; a second rotatably mounted shaft concentrically disposed within the first shaft and extending into the chamber, said second shaft being dielectric and rotatable independent of the first shaft; a first motor coupled to the first shaft exterior to the chamber for rotating the first shaft without rotating the second shaft; and a second motor coupled to the second shaft exterior to the chamber for rotating the second shaft without rotating the first shaft; said first shaft including means for removably mounting a first food preparing element rotatable with the first shaft; said second shaft including means for removably mounting a second food preparing element rotatable with the second shaft.
Claim 2
Dependent Claim
187 words
A microwave oven assembly for preparing a plurality of different foods selectively, comprising: a heating chamber, including a bottom surface having a substantially central opening, for enclosing the foods during preparation; a microwave oscillator for generating a first type of energy within the chamber; a heating element for generating a second type of energy effective to heat the chamber; a first rotatably mounted hollow shaft aligned with the central opening perpendicular to the plane of the bottom surface; a second rotatably mounted shaft concentrically disposed within the first shaft and extending into the chamber, said second shaft being dielectric and rotatable independent of the first shaft; a first motor coupled to the first shaft exterior to the chamber for rotating the first shaft without rotating the second shaft; and a second motor coupled to the second shaft exterior to the chamber for rotating the second shaft without rotating the first shaft; said first shaft including means for removably mounting a first food preparing element rotatable with the first shaft; said second shaft including means for removably mounting a second food preparing element rotatable with the second shaft.
Claim 3
Dependent Claim
30 words
The microwave oven of claim 1, wherein a choke cavity is provided proximate the opening encompassing the first shaft, for preventing said first energy from leaking out of the chamber.
Claim 4
Dependent Claim
33 words
The microwave oven of claim 2, wherenin said choke cavity comprises a shaft bearing for supporting said first shaft, side wall, and a bottom wall for deflecting the energy back into the chamber.
Claim 5
Dependent Claim
30 words
The microwave oven of claim 1, wherein said first food preparing element comprises a kneading blade rotatably mounted on a third shaft which is removably connected to said first shaft.
Claim 6
Dependent Claim
65 words
The microwave oven of claim 4, wherein said kneading blade is provided with a section perpendicular to a rotation radius of said blade, in the form of an equilateral triangle having two equal sides representing a length of two kneading surfaces, said blade disposed to be alternately rotated in the forward and reverse directions at substantially equal time rates of rotation by the first motor.
Claim 7
Dependent Claim
22 words
The microwave oven at claim 1, wherein said second food preparing element comprises a removable turntable rotatably mounted on a rotary bed.
Claim 8
Dependent Claim
124 words
The microwave oven of claim 1, further comprising: a bread pan, including a bottom surface and interior side walls, configured substantially rectangular, including a substantially central opening for penetration by the kneading blade, vertically extending ribs on opposing interior side walls, and a support portion fixedly secured to said bottom surface of said bread pan and having a leg; hook-like member fixed to the bottom surface of said chamber and disposed to engage said leg when said bread pan is turned in a forward rotating direction of said kneading blade; and a reverse blocking member fixed to said support portion, said reverse blocking member disposed to restrict movement of said support portion when said kneading blade is rotated in a reverse to rotating direction.
Claim 9
Dependent Claim
60 words
The microwave oven of claim 1, further comprising: a rotary connector shaft linked to said second shaft and fixed to a rotary bed for rotatably supporting said removable turntable; a disc shaped conductive plate attached to said rotary connector shaft, disposed to prevent said first energy entering a gap between said rotary bed and the bottom surface of the chamber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |