# US 2019/0172669 A1 · Electric circuit breaker device

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- Number: US 2019/0172669 A1
- Document ID: US20190172669A1
- Status: Published application
- Kind: A1
- Application number: 16/267,136
- Filed: 2019-02-04
- Published: 2019-06-06
- Earliest claimed: 2014-10-29
- Assignees: Daicel Corporation
- Applicants: Daicel Corporation
- Inventors: Toshiyuki SAKAI
- Web page: https://patentgrep.com/patent/US20190172669A1

## CPC

- H01H 39/006: {Opening by severing a conductor}
- 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

An electric circuit breaker device includes a cylindrical space penetrating from a first end to a second end of a housing made of a synthetic resin, an igniter, a projectile made of a synthetic resin, and a conductor piece forming part of an electric circuit, which are arranged axially in this order from the first end of the housing. The conductor piece is a plate piece comprising of connection sections at both ends thereof and a cutting section as an intermediate portion. The projectile is disposed to face the surface of the cutting section of the conductor piece in the axial direction of the housing. A cylinder made of a metal for reinforcing the housing is disposed between the projectile and an inner wall surface of the housing; the projectile has a constricted part fitted with an O-ring abutting against an inner periphery of the cylinder.

## Claims

### Claim 1

An electric circuit breaker device comprising:
in a cylindrical space penetrating from a first end to a second end of a housing made of a synthetic resin, an igniter, a projectile made of a synthetic resin, and a conductor piece forming part of an electric circuit, which are arranged axially in this order from the first end of the housing; and having an insulating space for receiving a cut portion of the conductor piece between the second end of the housing and the conductor piece, wherein:
the conductor piece is a plate piece comprising of connection sections at both ends thereof and a cutting section as an intermediate portion, and disposed so that the cutting section has a surface perpendicular to the axial direction of the housing;
the projectile is disposed to face the surface of the cutting section of the conductor piece in the axial direction of the housing;
a cylinder made of a metal for reinforcing the housing is disposed between the projectile and an inner wall surface of the housing; and
the projectile has a constricted part fitted with an O-ring, the O-ring abuts against an inner periphery of the cylinder, and the projectile has an outer surface free from contact with the inner surface of the cylinder.

### Claim 2 (depends on 1)

The electric circuit breaker device according to claim 1, wherein:
the projectile has a diameter-enlarged tip portion and a rod portion with a smaller outer diameter than the diameter-enlarged tip portion, and
the cylinder has a first end opening located at the side of the igniter and an opposite second end opening abutting against a stepped surface between the diameter-enlarged tip portion and the rod portion, and is disposed to enclose the rod portion.

### Claim 3 (depends on 1)

The electric circuit breaker device according to claim 1, wherein:
the projectile has a diameter-enlarged tip portion and a rod portion with a smaller outer diameter than the diameter-enlarged tip portion,
the igniter has a resin portion where part of a body of the igniter is enclosed with a resin, and an ignition portion is projected from the resin portion; and
the cylinder has a first end opening abutting against the resin portion of the igniter and an opposite second end opening abutting against a stepped surface between the diameter-enlarged tip portion and the rod portion, and is disposed to enclose the ignition portion of the igniter and the rod portion.

### Claim 4 (depends on 1)

The electric circuit breaker device according to any one of claim 1, wherein:
the projectile has a diameter-enlarged tip portion and a rod portion with a smaller outer diameter than the diameter-enlarged tip portion,
the diameter-enlarged tip portion has a widthwise cross-sectional shape of a quadrangle or a circle, and the rod portion has a widthwise cross-sectional shape of a circle; and
the cylinder has a widthwise cross-sectional shape of a circle.