US3715554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency heating apparatus
Assignee: Toshiba Corp
•
Filing: 1971-03-03
•
Granted: 1973-02-06
•
Expires: 1991-03-03
Abstract
Abstract In a high frequency heating apparatus of the class comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on the cabinet for closing the access opening, a high frequency oscillator mounted on the cabinet for radiating high frequency electromagnetic wave in the heating chamber and a locking mechanism for holding the door in the closed position, there are provided a door operating handle connected to the locking mechanism for operating the same and a switch mounted on the cabinet, the switch being interlocked with the locking mechanism for controlling the operation of the high frequency oscillator when the door is locked and unlocked by the locking mechanism.
Inventors
- 👤 S Umezu
- 👤 S Takeda
- 👤 K Mitsudome
- 👤 T Hashimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:18
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6414; H05B6/6417
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
200 words
In a high frequency heating apparatus comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on said cabinet for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber and a locking mechanism for holding said door in the closed position, the improvement which comprises: a door operating handle mechanism including a lever arm extending from said door outwardly of said cabinet, and a handle member connected to an end of said lever arm, said lever arm being pivotally connected to said door at substantially the middle portion of said lever arm for pivotal movement in a substantially vertical plane and being connected to said locking mechanism for operating the same, the portion of said lever arm extending outside said door being upwardly curved relative to the pivot point of said lever arm; a switch coupled to said high frequency oscillator, said switch being mounted on said cabinet; and means interlocking said switch with said locking mechanism for controlling the operation of said high frequency oscillator by operation of said locking mechanism when said door iS locked and unlocked by said locking mechanism.
Claim 2
Dependent Claim
200 words
In a high frequency heating apparatus comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on said cabinet for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber and a locking mechanism for holding said door in the closed position, the improvement which comprises: a door operating handle mechanism including a lever arm extending from said door outwardly of said cabinet, and a handle member connected to an end of said lever arm, said lever arm being pivotally connected to said door at substantially the middle portion of said lever arm for pivotal movement in a substantially vertical plane and being connected to said locking mechanism for operating the same, the portion of said lever arm extending outside said door being upwardly curved relative to the pivot point of said lever arm; a switch coupled to said high frequency oscillator, said switch being mounted on said cabinet; and means interlocking said switch with said locking mechanism for controlling the operation of said high frequency oscillator by operation of said locking mechanism when said door iS locked and unlocked by said locking mechanism.
Claim 3
Dependent Claim
200 words
In a high frequency heating apparatus comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on said cabinet for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber and a locking mechanism for holding said door in the closed position, the improvement which comprises: a door operating handle mechanism including a lever arm extending from said door outwardly of said cabinet, and a handle member connected to an end of said lever arm, said lever arm being pivotally connected to said door at substantially the middle portion of said lever arm for pivotal movement in a substantially vertical plane and being connected to said locking mechanism for operating the same, the portion of said lever arm extending outside said door being upwardly curved relative to the pivot point of said lever arm; a switch coupled to said high frequency oscillator, said switch being mounted on said cabinet; and means interlocking said switch with said locking mechanism for controlling the operation of said high frequency oscillator by operation of said locking mechanism when said door iS locked and unlocked by said locking mechanism.
Claim 4
Dependent Claim
200 words
In a high frequency heating apparatus comprising a cabinet defining a heating chamber having an access opening at one side thereof, a door mounted on said cabinet for closing said access opening, a high frequency oscillator for radiating high frequency electromagnetic waves in said heating chamber and a locking mechanism for holding said door in the closed position, the improvement which comprises: a door operating handle mechanism including a lever arm extending from said door outwardly of said cabinet, and a handle member connected to an end of said lever arm, said lever arm being pivotally connected to said door at substantially the middle portion of said lever arm for pivotal movement in a substantially vertical plane and being connected to said locking mechanism for operating the same, the portion of said lever arm extending outside said door being upwardly curved relative to the pivot point of said lever arm; a switch coupled to said high frequency oscillator, said switch being mounted on said cabinet; and means interlocking said switch with said locking mechanism for controlling the operation of said high frequency oscillator by operation of said locking mechanism when said door iS locked and unlocked by said locking mechanism.
Claim 5
Dependent Claim
135 words
A high frequency heating apparatus according to claim 1 wherein said locking mechanism comprises a locking member secured to said cabinet, the end of said lever arm remote from said handle being formed with a hook adapted to engage said locking member, and a spring connected between said lever arm and said door for biasing said lever arm so as to cause said hook to engage said locking member; and wherein said switch is provided with an operating lever actuated by said hook when it is engaged with said locking member for locking said door in the closed position so as to close said switch and energize said high frequency oscillator, said operating lever being released when said hook disengages said locking member so as to open said switch and deenergize said high frequency oscillator.
Claim 6
Dependent Claim
34 words
A high frequency heating apparatus according to claim 2 wherein said locking member is recessed to receive said operating lever of said switch to thereby define the limits of movement of said operating lever.
Claim 7
Dependent Claim
100 words
A high frequency heating apparatus according to claim 2 wherein said arm comprises a first lever and a second lever, the outer end of said first lever being connected to said handle and the inner end of said first lever being pivotally connected to said door, the outer end of said second lever being pivotally mounted on said door and the inner end of said second door being provided with said hook, and means for operatively interconnecting said first and second levers such that said second lever is rotated only when said first lever is rotated in a predetermined direction.
Claim 8
Dependent Claim
145 words
A high frequency heating apparatus according to claim 1 wherein said handle includes legs mounted on said door and adapted to be slidable in parallel with the front surface thereof; said locking member comprises a locking member secured to said cabinet, a locking rod, one end of said locking rod being secured to said leg and the other end being provided with a hook adapted to engage said locking member, and a spring connected between said locking rod and said door for causing said hook to engage said locking member when said door is closed; and said switch includes an operating lever disposed to be operated by said hook when it is engaged by said locking member so as to close said switch, said operating lever being released when said hook disengages said locking member for opening said switch, thus deenergizing said high frequency oscillator.
Claim 9
Dependent Claim
51 words
A high frequency heating apparatus according to claim 5 wherein said switch is contained in a casing secured to said cabinet, said locking member is formed by a portion of said casing and said switch operating member is pivotally supported by said casing for actuating said switch through an adjusting screw.
Claim 10
Dependent Claim
171 words
A high frequency heating apparatus according to claim 1 wherein said handle comprises a lever with its inner end pivotally mounted on said door, an arm formed on said inner end of said lever, and a pin connected to said arm and extending into said cabinet; said locking mechanism comprises a locking member secured to said cabinet, a locking lever having at its inner end a hook adapted to be engaged by said locking member and pivotally mounted on said door, means for operatively interconnecting said handle and said locking lever such that said locking lever is operated only when said handle is rotated in a predetermined direction, and a spring connected between said locking lever and said door for urging said hook to engage said locking member when said door is closed; and and switch is coupled to and closed by said pin carried by said arm when said hook engages said locking member and is opened when said hook disengages said locking member for deenergizing said high frequency oscillator.
Claim 11
Dependent Claim
25 words
A high frequency heating apparatus according to claim 7 wherein said pin for operating said switch is connected to the outer end of said handle.
Claim 12
Dependent Claim
31 words
A high frequency heating apparatus according to claim 1 wheRein said door operating handle mechanism includes a pair of said lever arms extending from said door and connected to said handle.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |