US 12,444,561 B2
Electric circuit breaker device that extinguishes an arc generated when conductor portion is cut
Toshiyuki Sakai, Tokyo (JP); and Tomohide Fujiwara, Tokyo (JP)
Assigned to DAICEL CORPORATION, Osaka (JP)
Filed by DAICEL CORPORATION, Osaka (JP)
Filed on Jul. 25, 2023, as Appl. No. 18/226,117.
Application 18/226,117 is a division of application No. 16/639,926, granted, now 11,756,758, previously published as PCT/JP2018/032962, filed on Sep. 6, 2018.
Claims priority of application No. 2017-177773 (JP), filed on Sep. 15, 2017.
Prior Publication US 2023/0368996 A1, Nov. 16, 2023
Int. Cl. H01H 39/00 (2006.01); H01H 71/02 (2006.01)
CPC H01H 39/006 (2013.01) [H01H 71/0207 (2013.01); H01H 71/0264 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An electric circuit breaker device comprising:
in a housing made of a synthetic resin,
an igniter, a rod-like projectile made of a synthetic resin, and a conductor portion for forming a part of an electric circuit, the igniter, the rod-like projectile, and the conductor portion being arranged in this order in a cylindrical space formed from a first end portion of the housing toward a second end portion opposite to the first end portion in a housing axial direction, and an insulating closed space between the second end portion of the housing and the conductor portion, wherein
the conductor portion is a plate portion including a first connection portion and a second connection portion on both end sides and a cut portion at an intermediate portion, and is disposed with a surface of the cut portion being along a housing width direction orthogonal to the housing axial direction,
the rod-like projectile includes an end portion having a cross-sectional shape of a rectangle in the housing width direction and being disposed to face the surface of the cut portion of the conductor portion in the housing axial direction,
the insulating closed space has a cross-sectional shape of a rectangle in the housing width direction and includes an opening portion facing the conductor portion, a closed end surface opposite to the opening portion in the housing axial direction, and four side surfaces between the opening portion and the closed end surface,
a width (W1) of the opening portion of the insulating closed space and a width (L1) of the end portion of the rod-like projectile have a relationship of W1>L1 and W1-L1≥0.25 mm,
for the insulating closed space, the width (W1) of the opening portion, a width (W3) between the side surfaces that oppose each other, and a width (W2) of the closed end surface have a relationship of W1>W2=W3, and the width (W2) of the closed end surface and the width (L1) of the end portion of the rod-like projectile have a relationship of W2>L1 and W2-L1≤0.25 mm, and
an annular raised section is formed due to a difference in the widths (W1-W3) at a boundary between the opening portion and the four side surfaces, and
wherein
the width (W1) of the opening portion of the insulating closed space and the width (L1) of the end portion of the rod-like projectile have a relationship of 2.0 mm>W1-L1≥0.25 mm.