# US 2026/0309338 A1 · Heating cooker

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- Number: US 2026/0309338 A1
- Document ID: US20260309338A1
- Status: Published application
- Kind: A1
- Application number: 19/633,695
- Filed: 2026-03-30
- Published: 2026-10-08
- Earliest claimed: 2025-04-03
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Shigenori MORIMOTO
- Web page: https://patentgrep.com/patent/US20260309338A1

## CPC

- F24C 15/022: {Latches}
- F24C 7/067: {on ranges}
- E05B 2047/0017: {with rotary motion}
- E05B 2047/0024: {Cams}
- F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS

## Abstract

A heating cooker includes: a main body portion; a door portion having a door hook; and a lock mechanism including a lock lever member that rotates about a fulcrum with rotation of a cam, in which the lock lever member includes: a first portion extending in a direction away from the fulcrum and provided with an engagement portion that engages with the door hook; and a second portion extending in a direction away from the fulcrum and provided at a position in a second direction opposite to the first direction with respect to the first portion, and when the lock lever member rotates in the first direction from a locked state where the engagement portion engages with the door hook, the first portion moves in a direction away from the door hook to release the locked state, and the second portion comes into contact with the door hook to push out the door portion in an opening direction.

## Claims

### Claim 1

A heating cooker comprising:
a main body portion;
a door portion having a door hook and being movable with respect to the main body portion;
and a lock mechanism including a cam, a motor that rotates the cam, and a lock lever member that rotates in a first direction about a fulcrum with rotation of the cam, wherein
the lock lever member includes:
a first portion extending in a direction away from the fulcrum and provided with an engagement portion that engages with the door hook; and
a second portion extending in a direction away from the fulcrum and provided at a position in a second direction opposite to the first direction with respect to the first portion, and
when the lock lever member rotates in the first direction from a locked state where the engagement portion engages with the door hook,
the first portion moves in a direction away from the door hook to release the locked state, and
the second portion comes into contact with the door hook to push out the door portion in an opening direction.

### Claim 2 (depends on 1)

The heating cooker according to claim 1, wherein
the door portion is a vertically opening door that is rotatable with respect to the main body portion on a horizontal rotation axis provided in a lower portion of the door portion.

### Claim 3 (depends on 1)

The heating cooker according to claim 1, wherein
the lock mechanism further includes a spring member whose one end is locked to the lock lever member, and
the spring member applies a force in a direction of rotating in the second direction to the lock lever member.

### Claim 4 (depends on 3)

The heating cooker according to claim 3, wherein
the lock lever member is biased by the spring member such that a part of the lock lever member is in contact with the cam,
the lock lever member becomes a position corresponding to the locked state in a state of being in contact with a portion corresponding to a short diameter of the cam, and
the lock lever member rotates in the first direction as compared with the locked state in a state of being in contact with a portion corresponding to a long diameter of the cam.

### Claim 5 (depends on 3)

The heating cooker according to claim 3, wherein
the one end of the spring member is locked to the second portion of the lock lever member.

### Claim 6 (depends on 1)

The heating cooker according to claim 1, wherein
the lock mechanism includes a cam phase detection switch that detects a phase of the cam, and
the cam phase detection switch outputs a signal for stopping driving of the motor when detecting that the phase of the cam has reached a given set phase.

### Claim 7 (depends on 6)

The heating cooker according to claim 6, further comprising:
an operation unit that detects an opening operation of the door portion, wherein
the motor starts an operation of rotating the cam in a case where the operation unit determines that the opening operation has been detected, and
the cam phase detection switch outputs a signal for stopping driving of the motor in a case where a phase indicating that the cam has made one rotation is detected.

### Claim 8 (depends on 1)

The heating cooker according to claim 1, wherein
the second portion has an inclined surface whose thickness along a rotation direction becomes shorter as a distance from the fulcrum increases, and
the second portion comes into contact with the door hook so that the door hook slides toward a distal end side of the second portion along the inclined surface when the lock lever member rotates in the first direction from the locked state.

### Claim 9 (depends on 1)

The heating cooker according to claim 1, wherein
the lock lever member includes a third portion that extends in a direction away from the fulcrum, is provided at a position in a second direction opposite to the first direction with respect to the second portion, and is in contact with the cam.