Method for manufacturing blade fuses

Abstract

To provide a blade-type fuse that has a low height while providing a fixing point for fixing a housing and a connection point for connecting external connection terminals without interfering with each other, and a manufacturing method for the blade-type fuse.SOLUTION: A blade-type fuse 400 includes a pair of terminals 110 connected to an external connection terminal 800, a fusing portion 200 connected between the terminals 110, and a housing 300 accommodating the fusing portion 200, and the terminals 110 are configured such that external contacts (410, 420) connecting the terminals 110 and the external connection terminal 800 are arranged side-by-side with part of the fusing portion 200, and the upper end 120 of the terminals 100 is inserted into a fixing hole 340 at the upper end of the housing 300 and crushed, such that the terminals 110 are fixed in the fixing hole 340.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a blade fuse used for protecting an electric circuit such as an automobile, and a method for manufacturing the blade fuse.

Background Art

[0002] Conventionally, a blade fuse as shown in Patent Document 1 has been used for protecting an electric circuit mounted on an automobile or the like, and various electrical components connected to the electric circuit. Specifically, the blade fuse includes a substantially U-shaped fusing portion and a pair of terminal portions connected to the fusing portion and extending downward, and an external connection terminal is connected to the lower half side of the pair of terminal portions. When an abnormality occurs in the electric circuit, the fusing portion of the blade fuse is melted by an abnormal current to cut off the electric circuit. Further, a fixing hole for fixing the housing is provided on the upper half side of the pair of terminal portions, and a fixing shaft of the housing is inserted into the fixing hole and caulked (such as cold caulking).

[0003] By the way, in recent years, there has been a demand for reducing the height of the blade fuse. When reducing the height of the blade fuse, it is sufficient to reduce the height of the terminal portion in the vertical direction. However, when the height of the terminal portion in the vertical direction is reduced, there is no space for arranging a fixing portion such as a fixing hole for fixing the housing and a connection portion for connecting the external connection terminal, and they interfere with each other, so it has been difficult to reduce the height of the terminal portion in the vertical direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] Therefore, in view of the above problems, the present invention provides a blade fuse that realizes low-profile while including a fixing portion for fixing a housing and a connection portion for connecting an external connection terminal without interfering with each other, and a method for manufacturing the blade fuse.

Means for Solving the Problems

[0006] The blade fuse of the present invention is a blade fuse including a pair of terminal portions connected to an external connection terminal, a fusing portion connected between the terminal portions, and a housing that houses the fusing portion, wherein the terminal portion is configured such that an external contact point where the terminal portion and the external connection terminal are connected is arranged side by side with a part of the fusing portion, and an upper end of the terminal portion is inserted into and crushed by a fixing hole at an upper end of the housing and is fixed in the fixing hole.

[0007] According to the above characteristics, an external contact point connected to an external connection terminal is arranged side by side with the fusing portion, and the height of the terminal portion in the vertical direction can be reduced. Further, since the upper end of the terminal portion is not a portion for connecting to the external connection terminal, even if the upper end of the terminal portion is used as a fixing portion with the housing, it does not interfere with the connection portion for connecting the external connection terminal. As a result, it is possible to realize low-profile while including a fixing portion for fixing a housing and a connection portion for connecting an external connection terminal without interfering with each other.

[0008] The blade fuse of the present invention includes a first connection point where the fusing portion and one of the terminal portions are connected, and a second connection point where the fusing portion and the other terminal portion are connected, and the first connection point and the second connection point are arranged at different heights above and below a central portion of the fusing portion.

[0009] By separating the first connection point and the second connection point vertically, the fusing portion can be arranged in a relatively free shape in a wide upper and lower space considering thermal balance. Therefore, even if the lateral width is narrowed, heat does not locally concentrate compared to the prior art, and the thermal balance can be maintained, so that desired fusing characteristics can be obtained.

[0010] The blade fuse of the present invention is characterized in that the fusing portion has a point-symmetrical shape about the central portion.

[0011] According to the above characteristics, thermal balance is maintained and fusing characteristics are stabilized.

[0012] The blade fuse of the present invention includes a first external contact where one of the terminal portions is connected to the external connection terminal, and a second external contact where the other terminal portion is connected to the external connection terminal. The height at which the first external contact and the second external contact are arranged is equal to the height at which the central portion of the fusing portion is arranged, and the distance between the first connection point and the first external contact is equal to the distance between the second connection point and the second external contact.

[0013] According to the above characteristics, even if the width of the fusing portion is narrowed, the overall length of the fusing portion can be increased, and it is possible to handle low-rated blade fuses. Further, since the distance between the first external contact and the first connection point is equal to the distance between the second external contact and the second connection point, the resistance values of the paths on the terminal portion through which current flows become equal, and the directionality with respect to the external contact disappears. That is, the directionality of attaching the blade fuse disappears, and it becomes easy to attach it to a housing such as a fuse box.

[0014] The blade fuse of the present invention is characterized in that the width of the fusing portion is narrower than the width of the terminal portion.

[0015] According to the above characteristics, since it is difficult to narrow the width of the terminal portion from the viewpoints of compatibility and width reduction, the width of the fusing portion is narrowed to narrow the width of the blade fuse.

[0016] The manufacturing method of the blade fuse of the present invention is a manufacturing method of a blade fuse including a pair of terminal parts connected to an external connection terminal, a fuse part connected between the terminal parts, and a housing that houses the fuse part, wherein the terminal part is configured such that an external contact point where the terminal part and the external connection terminal are connected is arranged side by side with a part of the fuse part, and an upper end of the terminal part is inserted into a fixing hole at an upper end of the housing and crushed to be fixed in the fixing hole.

[0017] According to the above characteristics, the external contact point connected to the external connection terminal is arranged side by side with the fuse part, and the height of the terminal part in the vertical direction can be reduced. Further, since the upper end of the terminal part is not a part for connecting to the external connection terminal, even if the upper end of the terminal part is used as a fixing location with the housing, it does not interfere with the connection location for connecting the external connection terminal. As a result, it is possible to provide a fixing location for fixing the housing and a connection location for connecting the external connection terminal without interfering with each other, and to achieve a low-profile design.

[0018] In the manufacturing method of the blade fuse of the present invention, fixing the upper end of the terminal part in the fixing hole is characterized in that first, the upper end of the housing inserted into the fixing hole is crushed by a first punching member having a tip smaller than the fixing hole, and then, the upper end of the housing is crushed by a second punching member having a tip larger than the first punching member.

[0019] According to the above characteristics, first, by crushing the upper end of the terminal part with the first punching member, the terminal part and the fixing hole of the housing are temporarily fixed and positioned, and then, by crushing the upper end of the terminal part with the second punching member, it can be accurately fixed at a desired position.

Effect of the Invention

[0020] As described above, according to the blade fuse and the manufacturing method of the blade fuse of the present invention, it is possible to achieve a low-profile design while providing a fixing location for fixing the housing and a connection location for connecting the external connection terminal without interfering with each other.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Description of Reference Numerals

[0022] 100 Terminal part 200 Fusing part 210 First connection point 220 Second connection point 230 Central part 300 Housing 400 Blade fuse 410 First external contact 420 Second external contact

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the shapes, materials, etc. of the respective members of the blade fuse in the embodiments described below are shown as examples and are not limited thereto.

[0024] First, the blade fuse 400 of the present invention is shown in FIG. 1. FIG. 1(a) is a front view of the blade fuse 400, and FIG. 1(b) is a front view of the blade fuse 400 with the housing 300 removed.

[0025] As shown in FIG. 1, the blade fuse 400 includes a pair of terminal portions 100 and a fuse portion 200 arranged side by side between the terminal portions 100. Further, the blade fuse 400 includes a housing 300 that houses the fuse portion 200 therein. The housing 300 is made of an insulator such as synthetic resin. Also, the terminal portion 100 is made of a metal conductor and is a portion that is electrically connected to an external connection terminal 800 described later. Specifically, the terminal portion 100 extends linearly in the vertical direction from the lower end 110 to the upper end 120 and includes a flat main body portion 130. The main body portion 130 is configured in a plate shape so as to be inserted into the external connection terminal 800 described later and includes a standing portion 132 that is a connection location with the fuse portion 200. The standing portion 132 of the main body portion 130 is thinner than the thickness of the main body portion 130 and protrudes inward from the inner end 131 of the main body portion 130. And the lateral width from the outermost outer end 133 of the terminal portion 100 to the boundary between the fuse portion 200 and the standing portion 132, that is, the lateral width of the terminal portion 100 is L1. Also, the main body portion 130 of the terminal portion 100 is a portion that connects to the external connection terminal 800. In order to provide compatibility so that it can be connected to various types of external connection terminals, it is difficult to make the lateral width L1 of the terminal portion 100 narrower. Furthermore, since the terminal portion 100 is narrowed to the limit, from the viewpoint of ensuring strength, the main body portion 130 of the terminal portion 100 is not provided with fixing holes or the like that have been conventionally used for fixing the housing 300.

[0026] Also, in the blade fuse 400, a terminal portion 100 having external contacts connected to external connection terminals 800 to be described later and a fusing portion 200 are arranged side by side, reducing the height of the terminal portion 100 in the vertical direction. Therefore, the terminal portion 100 with reduced height can only secure a space for connecting the external connection terminals 800, and it is difficult to secure a space for arranging fixing locations such as fixing holes for fixing the housing as in the prior art. Thus, in the blade fuse 400 of the present invention, the upper end 120 of the terminal portion 100 is configured to be inserted into the fixing hole 340 at the upper end of the housing 300. Further, by crushing the upper end 120 of the inserted terminal portion 100 with a punching member from above, the upper end 120 of the terminal portion 100 is in a state of being press-fitted into the fixing hole 340, and the terminal portion 100 and the housing 300 are firmly fixed. Since the upper end 120 of the terminal portion 100 is crushed, as shown in FIG. 2, the upper end 120 of the terminal portion 100 is in a state of being recessed downward within the fixing hole 340. And since the upper end 120 of the terminal portion 100 is not a portion for connecting to the external connection terminal 800, even if the upper end 120 of the terminal portion 100 is used as a fixing location with the housing 300, it will not interfere with the connection location for connecting the external connection terminal. As a result, it is possible to provide a fixing location for fixing the housing and a connection location for connecting the external connection terminal without interfering with each other, and achieve a low-profile design.

[0027] Also, when fixing the upper end 120 of the terminal portion 100 to the fixing hole 340, as shown in FIG. 1, first, the upper end 120 of the terminal portion 100 may be crushed from above by a first punching member 710 whose tip 711 is smaller than the fixing hole 340. Next, the upper end 120 of the terminal portion 100 may be crushed from above by a second punching member 720 whose tip 721 is larger than the tip 711 of the first punching member 710. In this way, first, by crushing the upper end 120 of the terminal portion 100 with the first punching member 710, the upper end 120 of the terminal portion 100 and the fixing hole 340 of the housing 300 are temporarily fixed and positioned. Then, by crushing the upper end 120 of the terminal portion 100 with the second punching member 720, it can be accurately fixed at a desired position. And by crushing in two steps, the load on the terminal portion 100 can be reduced, and the terminal portion 100 can be prevented from buckling. Note that the first punching member 710 and the second punching member 720 are arbitrary members made of a metal or the like harder than the terminal portion 100. Also, the tip 711 of the first punching member 710 preferably has an elliptical and sharp shape. Also, the tip 721 of the second punching member 720 is smaller than the fixing hole 340. Further, although the upper end 120 of the terminal portion 100 is crushed in two steps by the first punching member 710 and the second punching member 720, it is not limited thereto, and any punching member may be used to crush the upper end 120 of the terminal portion 100 in three or more steps.

[0028] Also, the positioning step portion 320 of the housing 300 described later is also a portion supported by a jig that holds the blade fuse 400 when the upper end 120 of the terminal portion 100 is crushed by a punching member. And when crushing by a punching member, since the housing 300 side is held instead of the terminal portion 100 side, the force received from the punching member is less likely to be applied to the terminal portion 100, and the terminal portion 100 can be prevented from buckling.

[0029] In addition, the fuse section 200 is arranged side by side with the terminal sections 100 on both sides. The fuse section 200 is accommodated in a space surrounded by a straight line connecting the lower ends 110 on both sides of the terminal section 100, a straight line connecting the upper ends 120 on both sides of the terminal section 100, and the inner end 131 of the main body section 130. And the fuse section 200 is entirely composed of a low melting point metal such as tin, silver, lead, nickel, etc., or an alloy thereof, and is configured to melt when an abnormal current flows. Specifically, the fuse section 200 has a substantially S-shaped configuration and includes a first connection point 210 connected to the standing-up portion 132 of one terminal section 100 and a second connection point 220 connected to the standing-up portion 132 of the other terminal section 100. Further, the fuse section 200 has a point-symmetrical shape about the central portion 230. That is, even if the fuse section 200 is rotated 180 degrees about the central portion 230, the shape of the fuse section 200 before rotation is the same as the shape of the fuse section 200 after rotation.

[0030] In this way, by making the fuse section 200 have a point-symmetrical shape about the central portion 230, thermal balance is maintained and the fusing characteristics are stabilized. Note that the fuse section 200 has a substantially S-shaped configuration (a configuration having one bending portion above and below the central portion 230) about the central portion 230, but is not limited thereto. As long as the fuse section 200 has a point-symmetrical shape about the central portion 230, it can have an arbitrary shape such as a configuration having two or more bending portions above and below the central portion 230 respectively. Further, although the fuse section 200 has a point-symmetrical shape about the central portion 230, it is not limited thereto, and the fuse section 200 can have an arbitrary shape.

[0031] Here, by arranging the terminal sections 100 on both sides side by side with the fuse section 200, the overall height of the blade fuse 400 can be reduced. However, since the terminal sections 100 are arranged on both sides, it is necessary to prevent the lateral width L3 of the blade fuse 400 from increasing. As described above, from the viewpoint of compatibility, it is difficult to further narrow the lateral width L1 of the terminal section 100. Therefore, the lateral width L2 of the fuse section 200, that is, the width L2 between the first connection point 210 and the second connection point 220 is narrowed to narrow the lateral width L3 of the blade fuse 400.

[0032] Also, when the lateral width L2 of the fuse portion 200 is narrowed, if the fuse portion has a substantially U-shaped configuration as in the prior art, the U-shaped portion thereof will be crushed, and thus the length of the fuse portion required to obtain a specified resistance value cannot be obtained. As a result, there is a problem that specified fusing characteristics cannot be obtained.

[0033] Therefore, in the blade fuse 400 of the present invention, the first connection point 210 and the second connection point 220 are arranged at different heights above and below the central portion 230. Specifically, the first connection point 210 of the fuse portion 200 is arranged at a height H1 from the lower end 110 of the terminal portion 100, the second connection point 220 of the fuse portion 200 is arranged at a height H2 from the lower end 110 of the terminal portion 100, and the central portion 230 of the fuse portion 200 is arranged at a height H3 from the lower end 110 of the terminal portion 100. The height H1 at which the first connection point 210 is arranged is lower than the height H3 at which the central portion 230 is arranged, and the height H2 at which the second connection point 220 is arranged is higher than the height H3 at which the central portion 230 is arranged. In this way, by separating the first connection point 210 and the second connection point 220 vertically, the fuse portion 200 can be arranged in a relatively free shape in the upper and lower wide spaces in consideration of the thermal balance. Therefore, compared with the prior art, heat is not locally concentrated and the thermal balance can be maintained, so that desired fusing characteristics can be obtained.

[0034] Also, when the width L2 of the fusing portion 200 is narrowed, the distance between the first connection point 210 and the second connection point 220 becomes shorter, so the shape of the fusing portion 200, particularly the total length of the fusing portion 200, is restricted. In particular, when reducing the rated value of the blade fuse 400, it is necessary to increase the total length of the fusing portion 200 to increase the resistance value. However, if the width L2 of the fusing portion 200 is narrowed, it becomes difficult to increase the total length of the fusing portion 200. Therefore, in the present invention, the first connection point 210 and the second connection point 220 are arranged at different heights above and below the central portion 230. In this way, by separating the first connection point 210 and the second connection point 220 vertically, the length between the first connection point 210 and the second connection point 220, that is, the total length of the fusing portion 200, can be extended vertically and increased, so that the shape of the fusing portion 200 can be changed. Therefore, even if the width L2 of the fusing portion 200 is narrowed, the total length of the fusing portion 200 can be increased, and it is possible to cope with a low-rated blade fuse 400.

[0035] In the blade fuse 400 of the present invention, since the width L2 of the fusing portion 200 is made narrower than the width L1 of the terminal portion 100, the width L3 of the blade fuse 400 can be narrowed. Further, since the fusing portion 200 has a point-symmetrical shape about the central portion 230, the vertical distance H5 (H5 = H3 - H1) between the central portion 230 of the fusing portion 200 and the first connection point 210 is equal to the vertical distance H6 (H6 = H2 - H3) between the central portion 230 of the fusing portion 200 and the second connection point 220. Also, the height H2 at which the second connection point 220 of the fusing portion 200 is arranged is higher than the height H1 at which the first connection point 210 of the fusing portion 200 is arranged, but it is not limited thereto. The shape of the fusing portion 200 may be determined such that the height H1 at which the first connection point 210 of the fusing portion 200 is arranged is higher than the height H2 at which the second connection point 220 of the fusing portion 200 is arranged.

[0036] Next, with reference to FIGS. 2 to 4, a state in which the blade fuse 400 is housed in the housing 900 and connected to the external connection terminal 800 will be described. Note that FIG. 2 is an overall perspective view of a state in which the blade fuse 400 is housed in the housing 900, FIG. 3(a) is a cross-sectional view taken along line A-A of FIG. 2 and shows a cross-sectional view of the state in which the blade fuse 400 is housed in the housing 900, FIG. 3(b) is a cross-sectional view taken along line B-B of FIG. 2 and shows a cross-sectional view of the state in which the blade fuse 400 is housed in the housing 900, and FIG. 4 is a cross-sectional view showing the removal of the housing 300 and the housing 900 in FIG. 3(a).

[0037] First, as shown in FIG. 2, the housing 900 is what is called a so-called fuse box, and has a housing space 910 large enough to house the blade fuse 400 and a pair of external connection terminals 800 inside the housing space 910. Positioning portions 920 protruding inward are provided on both sides of the housing space 910. The external connection terminal 800 has a so-called tuning fork terminal configuration with two clamping pieces 810 and is electrically connected to an external electric circuit or the like. When the blade fuse 400 is housed and attached to the housing 900, the blade fuse 400 is inserted from above into the housing space 910 opened upward. Then, the blade fuse 400 is pushed downward so that the terminal portion 100 of the blade fuse 400 is inserted between the clamping pieces 810 of the external connection terminal 800. Then, the positioning step portion 320 provided on the housing 300 of the blade fuse 400 abuts against the positioning portion 920 of the housing 900, so that the blade fuse 400 is positioned so as not to be pushed further into the housing space 910. As shown in FIG. 3, since the clamping pieces 810 of the external connection terminal 800 clamp and fix the terminal portion 100 from both sides, the blade fuse 400 housed in the housing space 910 of the housing 900 maintains a state of being electrically connected to the external connection terminal 800.

[0038] Also, as shown in FIGS. 3 and 4, since the position where the blade fuse 400 is accommodated is fixed by the positioning step portion 320, the position where one external connection terminal 800 and one terminal portion 100 are in contact and electrically connected, that is, the position of the first external contact point 410 is also fixed. Similarly, the position where the other external connection terminal 800 and the other terminal portion 100 are in contact and electrically connected, that is, the position of the second external contact point 420 is also fixed. And in the blade fuse 400 of the present application, in a state of being accommodated in a container 900 such as a fuse box, since the first external contact point 410 and the second external contact point 420 are arranged side by side with a part of the fusing portion 200, a low-profile can be realized. Furthermore, by realizing a low-profile, it is also a feature that the first external contact point 410 and the second external contact point 420 are arranged above the lower surface 301 of the housing 300.

[0039] And the current flowing in the electric circuit connected to the external connection terminal 800 flows from one external connection terminal 800 through the first external contact point 410 to the terminal portion 100, and along the path M1 on the terminal portion 100, from the first external contact point 410 to the first connection point 210 of the fusing portion 200. Further, the current flowing into the fusing portion 200 flows along the path M2 on the terminal portion 100 from the second connection point 220 of the fusing portion 200 to the second external contact point 420, and flows through the second external contact point 420 to the other external connection terminal 800. And when an abnormal current flows, the fusing portion 200 fuses to cut off the current, protecting the electric circuit connected to the external connection terminal 800.

[0040] Here, the first external contact 410 is arranged at a height H4 from the lower end 110, and the second external contact 420 is also arranged at a height H4 from the lower end 110. Furthermore, the height H4 at which the first external contact 410 and the second external contact 420 are arranged is equal to the height H3 at which the central portion 230 of the fusing part 200 is arranged. Therefore, the vertical distance between the first external contact 410 and the first connection point 210 of the fusing part 200 is equal to the vertical distance H5 between the central portion 230 of the fusing part 200 and the first connection point 210. Similarly, the vertical distance between the second external contact 420 and the second connection point 220 of the fusing part 200 is equal to the vertical distance H6 between the central portion 230 of the fusing part 200 and the second connection point 220. And the vertical distance H5 between the first external contact 410 and the first connection point 210 of the fusing part 200 is equal to the vertical distance H6 between the second external contact 420 and the second connection point 220 of the fusing part 200 (distance H5 = distance H6). Also, since the connection structures between the terminal portions 100 on both sides and the respective external connection terminals 800 are the same, the horizontal distance L5 between the first external contact 410 and the first connection point 210 of the fusing part 200 is equal to the horizontal distance L6 between the second external contact 420 and the second connection point 220 of the fusing part 200 (distance L5 = distance L6).

[0041] Thus, since the distances between the first external contact 410 and the first connection point 210 (specifically, the vertical distance H5 and the horizontal distance L5 respectively) and the distances between the second external contact 420 and the second connection point 220 (specifically, the vertical distance H6 and the horizontal distance L6 respectively) are equal, the lengths of the current path M1 flowing from the first external contact 410 to the first connection point 210 and the current path M2 flowing from the second connection point 220 to the second external contact 420 are equal. Therefore, since the resistance values of the paths M1 and M2 on the terminal portion 100 through which the current flows are equal, the directionality with respect to the external contact disappears, that is, the directionality of the attachment of the blade - type fuse 400 disappears, and the attachment to a housing such as a fuse box becomes easy.

[0042] As an example of the path through which current flows, a linear path M1 and a path M2, which are the shortest distances, are illustrated. However, the present invention is not limited thereto, and the current can flow along any path between the first external contact 410 and the first connection point 210, and any path between the second external contact 420 and the second connection point 220 on the terminal portion 100. Since the distance between the first external contact 410 and the first connection point 210 is equal to the distance between the second external contact 420 and the second connection point 220, no matter what path the current flows along, basically, the resistance values of the paths are substantially equal, so that the directionality with respect to the external contact disappears. That is, the directionality of the attachment of the blade fuse 400 disappears, and it becomes easy to attach the blade fuse 400 to a housing such as a fuse box.

[0043] Note that the external connection terminal 800 is in the form of a tuning fork terminal having a pair of clamping pieces 810. However, the present invention is not limited thereto, and any form may be used as long as it can be in electrical contact with the terminal portion 100. Further, in order to fix the position of the attached blade fuse 400, the positioning step portion 320 of the blade fuse 400 is in contact with the positioning portion 920 of the housing 900. However, the present invention is not limited thereto, and any appropriate configuration may be adopted as long as the position of the blade fuse 400 can be fixed.

[0044] Further, the blade fuse of the present invention is not limited to the above-described embodiments, and various modifications and combinations are possible within the scope described in the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of the rights.

Claims

【Claim 1】 A method for manufacturing a blade fuse comprising a pair of terminal portions connected to an external connection terminal, a fuse portion connected between the terminal portions, and a housing that houses the fuse portion, wherein the terminal portion is configured such that an external contact where the terminal portion and the external connection terminal are connected is arranged side by side with a part of the fuse portion, an upper end of the terminal portion is inserted into a fixing hole at an upper end of the housing and crushed to be fixed within the fixing hole, fixing the upper end of the terminal portion within the fixing hole firstly, crushing an upper end of the housing inserted into the fixing hole with a first punching member having a tip smaller than the fixing hole, and then, crushing the upper end of the housing with a second punching member having a tip larger than the first punching member. A method for manufacturing a blade fuse, characterized by the above.

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