# US 12,224,142 B2 · Breaker device

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- Number: US 12,224,142 B2
- Document ID: US12224142B2
- Status: Granted
- Kind: B2
- Application number: 18/701,878
- Filed: 2023-07-27
- Published: 2024-11-07
- Granted: 2025-02-11
- Earliest claimed: 2022-12-23
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Masato Nakamura; Shun Ito; Shinya Kimoto
- Web page: https://patentgrep.com/patent/US12224142B2

## CPC

- H01H 39/006: {Opening by severing a conductor}
- H01H 71/10: Operating or release mechanisms
- H01H 39/00: Switching devices actuated by an explosion produced within the device and initiated by an electric current
- H01H 71/02: Housings; Casings; Bases; Mountings
- H01H 2039/008: {using the switch for a battery cutoff}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

This breaker device includes: a casing; an igniter configured to generate gas; a pusher located inside the casing and positioned below the igniter; a conductor including a separating portion positioned below the pusher; and an elastic member disposed to be positioned between the casing and the pusher to press the outer side surface of the pusher. In the state where the pusher is stationary after the pusher moves the separating portion downward under the pressure of the gas generated by the igniter, the pusher is located at a level below the elastic member, and the inner surface of the elastic member overlaps the pusher as viewed from above.

## Claims

### Claim 1

A breaker device comprising:
a casing;
an igniter configured to generate gas;
a pusher located inside the casing, positioned below the igniter and having an outer side surface;
a conductor including a separating portion positioned below the pusher; and
an elastic member having an inner surface and disposed to be positioned between the casing and the pusher to press the outer side surface of the pusher, wherein:
in a state where the pusher is stationary after the pusher moves the separating portion downward under a pressure of the gas generated by the igniter,
the pusher is located at a level below the elastic member, and
the inner surface of the elastic member overlaps the pusher as viewed from above.

### Claim 2 (depends on 1)

The breaker device according to claim 1, wherein
in a state where the pusher is stationary after the pusher cuts off the separating portion under the pressure of the gas generated by the igniter,
an upper end of the pusher is located at a level below an upper end of the elastic member, and
a lower end of the pusher is located at a level below a lower end of the elastic member.

### Claim 3 (depends on 2)

The breaker device according to claim 2, wherein
in the state where the pusher is stationary after the pusher cuts off the separating portion under the pressure of the gas generated by the igniter,
the upper end of the pusher is located at a level below the lower end of the elastic member.

### Claim 4 (depends on 1)

The breaker device according to claim 1, further comprising:
a resin member located inside the casing and positioned between the casing and the pusher, wherein
the elastic member is in contact with the casing, the pusher, and the resin member.

### Claim 5 (depends on 1)

The breaker device according to claim 1, further comprising:
a resin member located inside the casing and positioned between the casing and the pusher, wherein
the elastic member is pressed against the casing, the pusher, and the resin member.

### Claim 6 (depends on 4)

The breaker device according to claim 4, wherein
in a state where the pusher is stationary after the pusher cuts off the separating portion under the pressure of the gas generated by the igniter,
the elastic member is held on the casing and the resin member.

### Claim 7 (depends on 1)

The breaker device according to claim 1, wherein
the casing includes a bent portion, and
the bent portion is in contact with the elastic member.

### Claim 8 (depends on 1)

The breaker device according to claim 1, wherein
in a state where the pusher is stationary after the pusher cuts off the separating portion under the pressure of the gas generated by the igniter,
the pusher includes no groove or step extending along an outer periphery of the pusher, at a level above a surface of the conductor along which the separating portion has been cut off.

### Claim 9 (depends on 1)

The breaker device according to claim 1, wherein
a side wall of the pusher contacts the elastic member and includes no groove extending along an outer periphery of the pusher.

### Claim 10 (depends on 1)

The breaker device according to claim 1, wherein
the elastic member is ring-shaped.

### Claim 11 (depends on 1)

The breaker device according to claim 1, wherein
the elastic member is disposed along the outer side surface of the pusher.

### Claim 12 (depends on 1)

The breaker device according to claim 1, wherein
the elastic member is disposed to be pressed against the casing.

### Claim 13 (depends on 1)

The breaker device according to claim 1, wherein
under the pressure of the gas generated by the igniter, the pusher cuts off the separating portion and moves the separating portion downward.

### Claim 14 (depends on 7)

The breaker device according to claim 7, wherein
the elastic member is disposed along the outer side surface of the pusher.