# US 2014/0197161 A1 · Door switch apparatus for microwave ovens

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- Number: US 2014/0197161 A1
- Document ID: US20140197161A1
- Status: Published application
- Kind: A1
- Application number: 14/155,628
- Filed: 2014-01-15
- Published: 2014-07-17
- Earliest claimed: 2013-01-16
- Assignees: Standex International Corporation
- Applicants: Standex International Corporation
- Inventors: Michael J. Dobie
- Web page: https://patentgrep.com/patent/US20140197161A1

## CPC

- H05B 6/6417: {Door interlocks of the microwave heating apparatus and related circuits}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A door switch apparatus for a microwave oven that disables the microwave system while not requiring any separate “fingers” or tongs on the door face to reach into the main body of the oven to activate a switch. The switch uses stackable switches activated by a single switch lever. The switch lever is preferably made from a solid piece of ultra-high molecular weight polyethylene (UHMV to keep the accuracy of the angular dimensions between the surfaces contacting the door hinge arm and the arm of switch to remain fixed.

## Claims

### Claim 1

A latching mechanism for a microwave oven having a closable door, said mechanism comprising:
a hinge arm that is pivotally attached to the closable door on the microwave oven;
an actuator arm that is pivotally attached to the microwave oven with said actuator arm having a switch surface and a hinge surface with said surfaces at a predetermined fixed angular relationship to one another;
a first switch having an activation arm that is in contact with said switch surface of said actuator arm such that when the door of the microwave is properly closed, said hinge arm, that is in contact with said hinge surface of said actuator arm, urges said actuator arm to push against said activation arm of said first switch thus causing said first switch to activate to indicate the door of said microwave is closed properly and causes said microwave to be operable.)

### Claim 2 (depends on 1)

The latching mechanism of claim 1 further comprising a second switch without an activating arm but is in electrical communication with said first switch wherein activation of said first switch results in activation of said second switch, thus indicating the door of the microwave is properly closed since both said first and said second switches were properly activated and in the proper order.)

### Claim 3 (depends on 2)

The latching mechanism of claim 2 where said first and second switches are stacked and mounted together.)

### Claim 4 (depends on 3)

The latching mechanism of claim 3 wherein said first and second switches are stacked and mounted together on a easily adjustable mounting plate which is attached to said microwave oven.)

### Claim 5 (depends on 4)

The latching mechanism of claim 4 wherein said adjustable mounting plate is mounted using at least two nuts that can be easily loosening and wherein said adjustable mounting plate further comprising a slot adapted to fit a screw driver such when the mounting nuts are loosened and wherein a screw driver is inserted in said slot, said adjustable mounting plate can be adjusted in order to have said switches activate properly.)

### Claim 6 (depends on 1)

The latching mechanism of claim 1 wherein said actuator arm is configured to amplify the motion of the door by a factor of approximately 3, thus for a movement of 1 mm of hinge arm, actuator arm moves 3 mm.)

### Claim 7 (depends on 2)

The latching mechanism of claim 2 wherein said actuator arm will deactivate said first and second switches when the door of the microwave oven is opened, thus causing the microwave oven to be inoperable.

### Claim 8 (depends on 7)

The latching mechanism of claim 7 wherein said actuator arm will return to its resting position, that is when the door is open, by the force of gravity alone.