Cutting device

Abstract

The cutting device is provided with: a housing; the propelling piece is located in the shell and is provided with a concave part; an igniter which holds the gunpowder therein, has a lid provided between the gunpowder and the pusher, is disposed in the recess, and is capable of generating a gas; a protection part which is provided in the housing or the igniter and is located inside the recessed part; and a conductor that has a separation part positioned below the pusher, the pusher moves the separation part downward when receiving the pressure of the gas generated by the igniter, the cover part has an opening part that is configured to open when receiving the pressure of the gas, and the lower end of the protection part is positioned below the lower end of the cover part.

Description

Technical Field

[0001] The present disclosure relates to a cutting device. Background Art

[0002] A known disconnecting device for use in connection with an electrical circuit has been disclosed. A disconnecting device having the following structure is disclosed: the disconnecting device includes a piston (thruster) having a recess, an igniter disposed within the recess, and a bus bar (conductor), wherein the piston moves from an ascending position to a descending position to partially disconnect the bus bar (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2017-533570 Summary of the Invention

[0006] However, in the piston disclosed in Patent Document 1, since the recessed portion is thin-walled, it is believed that the strength is reduced accordingly. Therefore, there is a risk that the thrust member may be damaged when the igniter generates gas, for example.

[0007] Therefore, the present disclosure provides a cutting device capable of suppressing damage to a thrust member when an igniter generates gas.

[0008] The cutting device of one embodiment of the present invention comprises: a shell; a propeller, which is located inside the shell and has a recess; an igniter, which holds gunpowder inside, has a cover provided between the gunpowder and the propeller, and is arranged in the recess to generate gas; a protective part, which is provided in the shell or the igniter and is located inside the recess; and a conductor, which has a separation part located below the propeller, the propeller moves the separation part downward when it is subjected to the pressure of the gas generated by the igniter, the cover has an opening part, the opening part is configured to open when subjected to the pressure of the gas, and the lower end of the protective part is located below the lower end of the cover part.

[0009] The cutting device of one embodiment of the present invention comprises: a shell; a propeller, which is located inside the shell and has a recess; an igniter, which holds gunpowder inside, has a cover portion provided between the gunpowder and the propeller, and is arranged in the recess to generate gas; a protective portion, which is provided to cover the inner surface of the recess; and a conductor, which has a separation portion located below the propeller, and the propeller moves the separation portion downward when it is subjected to the pressure of the gas generated by the igniter.

[0010] According to one aspect of the present disclosure, it is possible to realize a cutoff device capable of suppressing damage to a thrust member when an igniter generates gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1A This is a first perspective view showing the cutting device according to the first embodiment.

[0012] Figure 1B This is a second perspective view showing the cutting device according to the first embodiment.

[0013] Figure 2 It is a cross-sectional perspective view showing the cutting device according to the first embodiment.

[0014] Figure 3A This is a cross-sectional view showing the cutting device according to the first embodiment.

[0015] Figure 3B This is a perspective view showing a portion of the igniter according to the first embodiment before gas generation.

[0016] Figure 3C This is a plan view of the cover portion and the protection portion of the igniter according to the first embodiment, as viewed from below, before gas is generated.

[0017] Figure 4A This is a cross-sectional view for explaining the cutting operation of the cutting device according to the first embodiment.

[0018] Figure 4B This is a perspective view showing a portion of the igniter according to the first embodiment after gas generation.

[0019] Figure 5A This is a cross-sectional view showing a cutting device according to Modification 1 of Embodiment 1.

[0020] Figure 5B This is a cross-sectional view showing a cutting device according to a second modification of the first embodiment.

[0021] Figure 5C This is a cross-sectional view showing a cutting device according to a third modification of the first embodiment.

[0022] Figure 5D This is a cross-sectional view showing a cutting device according to a fourth modification of the first embodiment.

[0023] Figure 6 This is a flowchart showing the manufacturing process of the cutting device according to the first embodiment.

[0024] Figure 7 It is a cross-sectional view showing a cutting device according to a second embodiment.

[0025] Figure 8 It is a cross-sectional view showing a cutting device according to another embodiment.

[0026] Figure 9 This is a cross-sectional view for explaining a state in which a separation portion of a cutting device according to another embodiment has moved downward. DETAILED DESCRIPTION

[0027] The cutting device of one embodiment of the present invention comprises: a shell; a propeller, which is located inside the shell and has a recess; an igniter, which holds gunpowder inside, has a cover provided between the gunpowder and the propeller, and is arranged in the recess to generate gas; a protective part, which is provided in the shell or the igniter and is located inside the recess; and a conductor, which has a separation part located below the propeller, the propeller moves the separation part downward when it is subjected to the pressure of the gas generated by the igniter, the cover has an opening part, the opening part is configured to open when subjected to the pressure of the gas, and the lower end of the protective part is located below the lower end of the cover part.

[0028] Thus, because the lower end of the protective portion is positioned below the lower end of the cover portion, when the opening is subjected to the pressure of the gas generated by the igniter and opens downward, the opened opening contacts the protective portion, and the protective portion prevents it from opening significantly. In other words, the protective portion acts as a barrier to the opening opening, preventing the opened opening from contacting the recessed portion of the pusher. Therefore, in the cutting device, damage to the pusher due to contact with the opening when the gas is generated by the igniter can be prevented.

[0029] Furthermore, for example, it is preferable that the protection portion includes a first cylindrical portion connected to the housing and a second cylindrical portion located below the first cylindrical portion and having a smaller diameter than the first cylindrical portion.

[0030] As a result, the second cylindrical portion of the protective portion is positioned further inward than the first cylindrical portion. Therefore, compared to a case where the first and second cylindrical portions have the same diameter, the thickness of the portion of the recessed portion of the pusher corresponding to the second cylindrical portion can be made thicker. In other words, the strength of the pusher can be increased. Consequently, in the cutting device, damage to the pusher can be further reduced.

[0031] In addition, for example, it is preferred that the recess of the propulsion member has: a first portion, whose diameter is larger than the diameter of the first cylindrical portion; and a second portion, which is located below the first portion and has a diameter larger than the diameter of the second cylindrical portion, and the diameter of the first portion is larger than the diameter of the second portion.

[0032] Thus, since the thickness of the second portion of the recess can be made thicker, the strength of the pusher can be increased compared to a case where the thickness of the second portion is the same as the thickness of the first portion.

[0033] Furthermore, for example, it is preferable that the distance from the lower end of the cover to the lower end of the second cylindrical portion is equal to or longer than half the length of the notch provided in the opening of the cover.

[0034] Thus, since the second barrel is provided at a position more than half the length of the surface below the cover, it is possible to more reliably suppress the opening from contacting the pusher. Therefore, in the cutting device, it is possible to more reliably suppress the pusher from being damaged.

[0035] Furthermore, for example, it is preferable that the diameter of the opening below the protection portion is smaller than the diameter of the cover portion.

[0036] This allows the pressure of the gas generated by the igniter to be concentrated, thereby reducing the amount of explosives.

[0037] In addition, for example, it is preferred that the shell is a metal product, and the protective part has: a metal component, which is connected to the shell; and a resin component, which is arranged on the inner side of the metal component, the metal component includes the first barrel and the second barrel, and the length from the upper end of the resin component to the lower end of the resin component in the up-down direction is greater than the length from the lower end of the cover to the lower end of the second barrel in the up-down direction.

[0038] Thus, since the opening and the resin member come into contact when the igniter generates gas, even if the opening is formed of metal, electrical conduction between the opening and the housing via the metal member can be suppressed. In other words, the resin member can suppress the arc generated during the cut-off from being conducted to the igniter via the housing.

[0039] In addition, for example, preferably, the resin component has: a first part, which is arranged on the inner side of the metal component; a second part, which is arranged on the outer side of the metal component; and a third part, which connects the first part and the second part, and the third part is located below the metal component.

[0040] Thus, since the third portion is located below the metal member, it is possible to more reliably suppress contact between the opening and the metal member after the igniter generates gas.

[0041] Furthermore, for example, the protection portion may include a resin portion and a metal portion, the resin portion and the metal portion being integrally formed, and the resin portion may cover a portion of an inner surface of the metal portion below the cover portion.

[0042] Thus, compared with a case where the resin portion and the metal portion are separate bodies, a manufacturing step such as attaching the resin portion to the metal portion can be omitted, and thus manufacturing can be facilitated.

[0043] Furthermore, for example, it is preferable that the distance from the lower end of the cover portion to the lower end of the resin portion is equal to or greater than half the length of the notch provided in the opening portion of the cover portion.

[0044] Thus, since the resin portion is provided to a position at least half the length of the lower surface of the cover portion, it is possible to more reliably suppress conduction between the opening and the housing via the metal portion after the igniter generates gas.

[0045] In addition, for example, preferably, the resin portion has: a first portion, which is arranged on the inner side of the metal portion; a second portion, which is arranged on the outer side of the metal portion; and a third portion, which connects the first portion and the second portion, and the third portion is located below the metal portion.

[0046] Thus, since the third portion is located below the metal portion, it is possible to more reliably suppress contact between the opening and the metal portion after the igniter generates gas.

[0047] In addition, a cutting device of one embodiment of the present invention comprises: a shell; a propeller, which is located inside the shell and has a recess; an igniter, which holds gunpowder inside, has a cover portion provided between the gunpowder and the propeller, and is arranged in the recess to enable gas to be generated; a protective portion, which is provided to cover the inner surface of the recess; and a conductor, which has a separation portion located below the propeller, and the propeller bears the pressure of the gas generated by the igniter and moves the separation portion downward.

[0048] Thus, since the recessed portion of the pusher is covered by the protective portion, when the opening portion is subjected to the pressure of the gas generated by the igniter and opens downward, the opened opening portion contacts the protective portion, and the protective portion can suppress the opening portion from contacting the recessed portion of the pusher. Therefore, in the cutting device, it is possible to suppress damage to the pusher due to contact with the opening portion when the gas is generated by the igniter.

[0049] Furthermore, for example, it is preferable that the protection portion covers a portion of the inner surface of the recessed portion that is below the cover portion.

[0050] Thus, since the protection portion covers the portion of the pusher that may come into contact with the opening, damage to the pusher can be effectively suppressed.

[0051] In addition, for example, preferably, the protection portion is a metal layer covering the inner surface of the recess, or an insulating layer covering the inner surface of the recess and made of a material different from that of the pusher, and the protection portion is located between the cover and the pusher.

[0052] Thus, the metal layer or insulating layer formed integrally with the pusher can be used to suppress damage to the pusher. Furthermore, for example, if the protective portion is a metal layer, damage to the pusher can be further reliably suppressed, and if the protective portion is an insulating layer, electrical conduction between the opening and the housing via the protective portion can be further suppressed.

[0053] Furthermore, for example, it is preferable that the protection portion is a metal member or an insulating member provided inside the recessed portion, and the metal member or the insulating member is located between the cover portion and the pusher.

[0054] Thus, the pusher can be prevented from being damaged by the metal member or the insulating member that is separate from the pusher. Furthermore, for example, if the protective portion is a metal member, damage to the pusher can be further reliably prevented, and if the protective portion is an insulating member, electrical conduction between the opening and the housing through the protective portion can be further prevented.

[0055] Furthermore, for example, it is preferable that the protection portion entirely covers the inner surface of the recessed portion located below the cover portion.

[0056] Thus, since the protection portion covers all (including substantially all) of the portion of the pusher that may come into contact with the opening, damage to the pusher can be more effectively suppressed.

[0057] Furthermore, for example, the protection portion may be configured to come into contact with the cover portion when the gas is generated.

[0058] Thus, the protection portion can suppress contact between the cover portion and the pusher, thereby suppressing damage to the pusher.

[0059] Furthermore, the pusher may separate the separation portion from the conductor when receiving the pressure of the gas generated by the igniter, thereby moving the separation portion downward.

[0060] Hereinafter, each embodiment and the like will be described in detail with reference to the drawings.

[0061] In addition, each embodiment described below represents a general or specific example. The numerical values, shapes, components, configuration positions of components, connection methods, steps (processes), and the order of steps (processes) shown in the following embodiments are examples and are not intended to limit the present disclosure. In addition, among the components of the following embodiments, the components not described in the independent claims are described as arbitrary components.

[0062] In addition, each figure is a schematic diagram and does not necessarily illustrate the figure strictly. Therefore, for example, the scales in each figure are not necessarily the same. In addition, in each figure, the same reference numerals are used for substantially the same structure, and repeated descriptions are omitted or simplified.

[0063] In addition, in this specification and the accompanying drawings, the X-axis, Y-axis and Z-axis show the three axes of the three-dimensional orthogonal coordinate system of the right-hand system. In each embodiment, the Z-axis direction is set to the moving direction of the propulsion member. In addition, in this specification, "looking down" means observing the situation of the cutting device from the Z-axis direction, and the side means the direction orthogonal to the Z-axis direction. In addition, in this specification, the Z-axis direction is also recorded as the up-down direction. However, in this specification, the up-down direction of the cutting device is only for the convenience of illustrating each embodiment, etc. and represents the relative positional relationship of each element in the cutting device. For example, in this specification, terms such as "above" and "below" do not refer to the upper direction (vertical above) and the lower direction (vertical below) in absolute spatial cognition, but are used as terms specified by the relative positional relationship based on the moving direction of the propulsion member. In addition, the posture when the cutting device is set is not limited to the direction shown in the accompanying drawings.

[0064] In addition, in this specification, terms such as equal and parallel that indicate the relationship between elements, terms such as circle and trapezoid that indicate the shape of elements, and numerical values and numerical ranges are not expressions with strict meanings, but also mean expressions that include substantially equivalent ranges, such as differences of about a few percent (or about 10%).

[0065] In this specification, unless otherwise specified, ordinal numbers such as “first” and “second” do not indicate the number or order of components, but are used to distinguish components of the same type to avoid confusion.

[0066] (Implementation 1)

[0067] Below, refer to Figures 1A to 4B The cutting device according to this embodiment will be described.

[0068] [1-1. Structure of cutting device]

[0069] First, refer to Figures 1A to 3CThe structure of the cutting device of this embodiment will be described. Figure 1A It is a first perspective view showing the cutting device 1 according to this embodiment. Figure 1B It is a second perspective view showing the cutting device 1 according to this embodiment. Figure 2 It is a cross-sectional perspective view showing the cutting device 1 according to this embodiment. Figure 3A It is a cross-sectional view showing the cutting device 1 according to this embodiment.

[0070] Figure 1A This is a diagram obtained by observing the cutting device 1 in a state rotated about the Z axis as the rotation axis when viewed from the front view, as viewed from the X axis direction. Figure 1B This is a diagram showing the cutting device 1 viewed from an oblique downward direction. Figure 2 1 is a perspective view showing a cross section of the cutting device 1 when no cutting operation is performed (in an initial state) and cut along the YZ plane. Figure 3A This is a front view showing a cross section of the cutting device 1 when no cutting operation is performed (in an initial state) taken along the YZ plane.

[0071] like Figures 1A to 3A As shown, the disconnecting device 1 includes an igniter 10, an upper shell 20, a lower shell 30, a resin member 40, a conductor 50, a pusher 60, a protective portion 80, and elastic members 90, 92, 94, and 96. The disconnecting device 1 is a device that is mounted on an object having an electric circuit and is used to prevent the abnormal damage from becoming larger by operating and disconnecting the circuit when an abnormality occurs in the circuit, system, etc. within the object. The disconnecting device 1 is, for example, mounted on a vehicle as an example of an object, connected between an electric motor and a battery (such as a lithium-ion battery) for driving the electric motor, and disconnects the electrical connection between the electric motor and the battery for driving the electric motor in an emergency such as an abnormality or an accident. In addition, the object may be an object other than a vehicle, for example, a home appliance, a solar power generation system, etc., but is not particularly limited.

[0072] The igniter 10 holds gunpowder internally and has a cover 11 positioned between the gunpowder and the propeller 60. The cover 11 is located within a recess 61 and is capable of generating gas. For example, the igniter 10 is an electronic igniter having a gunpowder portion and a conductive pin. The gunpowder portion contains ignition powder, and the conductive pin is used to energize the gunpowder portion. During operation, an operating current for igniting the ignition powder is supplied from an external power source to the conductive pin, thereby igniting and burning the ignition powder, generating gas (combustion gas). Furthermore, the formation of the recess 61 allows for miniaturization of the cutting device 1.

[0073] Igniter 10 is fixed to upper small-diameter portion 21 of upper housing 20 .

[0074] Here, further reference Figure 3B and Figure 3C The cover portion 11 will be described. Figure 3B It is a perspective view showing a part of the igniter 10 according to the present embodiment before gas is generated. Figure 3C This is a plan view of the cover portion 11 and the protection portion 80 of the igniter 10 according to the present embodiment, as seen from below, before gas is generated. Figure 3C The diagram shows the cover 11 (opening 11a and outer frame 11b) and the second cylindrical portion 82 as viewed from the negative Z-axis side toward the positive Z-axis side. "Before gas generation" means "before the shutoff operation."

[0075] like Figure 3B and Figure 3C As shown, the cover 11 has an opening 11a and an outer frame 11b. Figure 3C , the notch 11a1 is schematically shown by a dotted line. The cover 11 is formed of metal, but is not limited thereto.

[0076] The opening 11a is configured to open toward the negative side of the Z axis and is open downward under the pressure of the gas. The opening 11a is, for example, planar, but may also be curved. A notch 11a1 (groove) is formed in the opening 11a to facilitate opening.

[0077] In addition, Figure 3B 、 Figure 3C In the embodiment, the notch 11a1 is not in contact with the outer frame portion 11b, but the notch 11a1 may be in contact with the outer frame portion 11b.

[0078] The outer frame portion 11 b is a cylindrical member that surrounds the opening portion 11 a in a plan view.

[0079] In addition, the cover portion 11 may be covered with resin, etc. In other words, the cover portion 11 and the protection portion 80 may be electrically insulated from each other in the initial state.

[0080] Figure 3C The length L2 shown is half the length of the notch 11a1 of the opening 11a. In addition, the length L2 may be the same as half the length of the diameter of the opening 11a.

[0081] Furthermore, the planar shape of the opening 11 a is not limited to a circular shape, and may be an elliptical shape, a rectangular shape, or the like.

[0082] Refer again Figure 1A to Figure 2The upper housing 20 and the lower housing 30 constitute the outer shell of the cutting device 1 and house the igniter 10, the resin member 40, a portion of the conductor 50, the pusher 60, and the protective portion 80. Furthermore, a space 70 extending in the vertical direction is formed within the upper housing 20 and the lower housing 30. The space 70 is formed into a cylindrical shape so that the pusher 60 can move. The pusher 60 is housed on the upper end side (positive side of the Z axis) of the space 70 in the vertical direction (Z axis direction).

[0083] The upper housing 20 and lower housing 30 are each formed of a metal such as stainless steel (SUS), but may also be formed of other metals such as aluminum. Furthermore, the upper housing 20 and lower housing 30 have cylindrical outer shapes, but are not limited to these shapes. Furthermore, the upper housing 20 and lower housing 30 are secured together using fastening members such as screws and rivets. The upper housing 20 and lower housing 30 are examples of housings.

[0084] The upper housing 20 is, for example, a cylindrical member with a stepped shape, the interior of which is hollow. The upper housing 20 includes a small-diameter portion 21 located at the top, a large-diameter portion 23 located at the bottom, and a connecting portion 22 connecting the small-diameter portion 21 and the large-diameter portion 23. The small-diameter portion 21 and the large-diameter portion 23 are coaxially arranged, with the large-diameter portion 23 having a larger diameter than the small-diameter portion 21.

[0085] The lower housing 30 is a hollow cylindrical member with a bottom, and has a convex portion 30a protruding upward. Specifically, the lower housing 30 includes the convex portion 30a, a bottom portion 33, and a side wall portion 34. The convex portion 30a, the bottom portion 33, and the side wall portion 34 are integrally formed.

[0086] In this specification, "integrally formed" means at least one of each structural part being formed of the same material, being formed at the same time, and being the same object (single object).

[0087] The protrusion 30a is located below the separation portion 51 and protrudes upward in the space 70. The protrusion 30a is connected to one end of the bottom portion 33 and protrudes upward (on the positive side of the Z axis) from the bottom portion 33 in the space 70. The protrusion 30a is configured to contact the pusher 60, which has moved downward due to the gas generated by the igniter 10, through the conductor 50. The protrusion 30a is pressed downward by the pusher 60, thereby deforming downward. In other words, the protrusion 30a functions to absorb the impact (stress) from the pusher 60 through deformation.

[0088] Furthermore, the convex portion 30a forming the concave portion of the lower housing 30 when the cutting device 1 is viewed from the negative Z-axis side toward the positive Z-axis side is exposed when viewed from the outside of the cutting device 1. In this embodiment, the convex portion 30a has a shape that tapers toward the top in the space 70, but the shape is not limited to this.

[0089] The bottom portion 33 connects the convex portion 30a and the side wall portion 34. In other words, the convex portion 30a and the side wall portion 34 are connected via the bottom portion 33. The outer surface and the inner surface of the bottom portion 33 are inclined upward from the convex portion 30a toward the side wall portion 34.

[0090] The side wall portion 34 is formed to be connected to the other end of the bottom portion 33 and to extend upward from the bottom portion 33. The side wall portion 34 has a cylindrical shape, and in this embodiment, a circular cylindrical shape. The side wall portion 34 is coaxially arranged with the small diameter portion 21 and the large diameter portion 23. For example, the diameter of the side wall portion 34 is equal to the diameter of the large diameter portion 23.

[0091] In the present embodiment, the thicknesses of the convex portion 30 a , the bottom portion 33 , and the side wall portion 34 are the same, but may be different from each other, for example.

[0092] The resin member 40 is a member that covers a portion of the conductor 50. The resin member 40 is also a part of a component that forms the space 70. The resin member 40 includes an embedded portion 41, a first cylindrical portion 42, and a second cylindrical portion 43.

[0093] The embedded portion 41 is a portion of the resin member 40 where the conductor 50 is embedded. For example, the embedded portion 41 is partially exposed from the housing. The embedded portion 41 has a through hole formed therein in which the conductor 50 (specifically, the holding portion 52) is arranged.

[0094] The first cylindrical portion 42 is a portion of the resin member 40 that is disposed within the housing. When the cut-off operation is not performed (when the igniter 10 is not used to generate gas), the pusher 60 is disposed within the first cylindrical portion 42. The inner diameter of the first cylindrical portion 42 is smaller than the inner diameter of the second cylindrical portion 43. Figure 2 and Figure 3A The position of the pusher 60 shown shows an initial position when no cutting action is performed.

[0095] The second cylindrical portion 43 is the portion of the resin member 40 disposed within the housing and is located below the first cylindrical portion 42. The inner diameter of the second cylindrical portion 43 is larger than that of the first cylindrical portion 42. This increases the volume of the lower portion of the space 70. This suppresses the increase in pressure within the housing caused by the gas generated by the igniter 10 and the movement of the thruster 60 caused by the gas, thereby suppressing deformation of the cutting device 1.

[0096] Thus, the pusher 60 moves in the space 70 formed by the first cylindrical portion 42 and the second cylindrical portion 43. In addition, the first cylindrical portion 42 and the second cylindrical portion 43 are not limited to having different inner diameters, and the inner diameters may be the same.

[0097] The conductor 50 is a conductive metal member partially located inside the upper housing 20 and the lower housing 30. When the disconnect device 1 is installed in a predetermined circuit, the conductor 50 forms part of that circuit and is also called a bus bar. The conductor 50 is a flat plate-shaped member held by the resin member 40 and extending across the interiors of the upper housing 20 and the lower housing 30. The conductor 50 has a separating portion 51 and a retaining portion 52.

[0098] The conductor 50 can be formed of a metal such as copper (Cu). However, the conductor 50 may be formed of a metal other than copper or an alloy of copper and another metal. For example, the conductor 50 may contain manganese (Mn), nickel (Ni), platinum (Pt), or the like.

[0099] The separation portion 51 is a portion of the conductor 50 that is separated by the pusher 60 that receives the pressure of the gas generated by the igniter 10 , and is located below the pusher 60 in the initial position.

[0100] The holding portion 52 is the portion of the conductor 50 held by the resin member 40. The holding portion 52 is the portion that does not overlap with the pusher 60 when viewed from above, for example, the portion that overlaps with the resin member 40 when viewed from above and the portion located outside the housing. The holding portion 52 remains held by the resin member 40 even after the separating portion 51 is cut.

[0101] The pusher 60 is positioned below the igniter 10 and is arranged to be movable downward. In the event of a system abnormality, the pusher 60 moves downward to disconnect the conductor 50 and urgently interrupt the conduction of the circuit. Thus, the pusher 60 is configured to withstand the pressure of the gas generated by the igniter 10 and to separate the separation portion 51 from the conductor 50.

[0102] The pusher 60 is formed of an insulating member such as a synthetic resin. In the present embodiment, the pusher 60 is formed of nylon. The pusher 60 has a cylindrical shape and an outer diameter corresponding to the inner diameter of the small-diameter portion 21 of the upper shell 20. In addition, the pusher 60 has a recess 61, and the igniter 10 is arranged inside the recess 61. The shape of the pusher 60 is not limited to the above content and can be appropriately changed according to the shapes of the upper shell 20 and the lower shell 30. The recess 61 is the upper portion of the pusher 60, or the portion with a recess facing downward.

[0103] In addition, Figure 2 In the example, the recess 61 is in the state where the cutting device 1 does not perform the cutting operation ( Figure 2 The portion of the lower side surface surrounded by the small-diameter portion 21 and the connecting portion 22) in the state shown.

[0104] The recessed portion 61 includes a first portion 62 and a second portion 63. When viewed from above, the first portion 62 has a larger diameter (e.g., inner diameter) than the first cylindrical portion 81 of the protective portion 80. The second portion 63 is located below the first portion 62 and has a larger diameter (e.g., inner diameter) than the second cylindrical portion 82. When viewed from above, the diameter of the first portion 62 is larger than the diameter of the second portion 63. For example, when viewed in cross section, the inner wall of the first portion 62 has a tapered shape in which the diameter decreases as it approaches the second portion 63. However, it may also have a stepped shape in which the diameter decreases in stages.

[0105] The protection portion 80 is a component for preventing the pusher 60 from being damaged by the opening 11a of the igniter 10 when the igniter 10 generates gas. Specifically, the protection portion 80 serves as a barrier to the situation where the opening 11a is widely opened, thereby preventing the opening 11a opened by the igniter 10 from coming into contact with the pusher 60 and causing damage to the recessed portion 61 of the pusher 60.

[0106] Protective portion 80 is provided in the housing (e.g., upper housing 20) or igniter 10, and has a portion located within recess 61. In this embodiment, protective portion 80 is provided in the housing (specifically, small-diameter portion 21). Protective portion 80 is fixed to small-diameter portion 21 by welding, for example, but the fixing method is not limited thereto.

[0107] like Figure 3A As shown in FIG. 8 and FIG. 9 , the protection portion 80 includes a first cylindrical portion 81 and a second cylindrical portion 82. The first cylindrical portion 81 and the second cylindrical portion 82 are integrally formed.

[0108] The first cylindrical portion 81 is a cylindrical portion that surrounds the lateral side of the igniter 10 and has a shape that follows the igniter 10. In this embodiment, when viewed in cross-section, the first cylindrical portion 81 is formed into a stepped shape (e.g., a two-stepped shape) in which the diameter (e.g., inner diameter) gradually decreases as it goes downward. The shape of the first cylindrical portion 81 is not limited to this. For example, the first cylindrical portion 81 may have a tapered shape in which the diameter decreases as it goes downward, or may have other shapes.

[0109] At least a portion of the first cylindrical portion 81 may be in contact with the igniter 10. Below the first cylindrical portion 81, the second cylindrical portion 82 is arranged.

[0110] Furthermore, the first cylindrical portion 81 has a flange portion 83 at its upper portion. The flange portion 83 is an annular portion (e.g., a plate-shaped member) that protrudes outward from the upper end of the first cylindrical portion 81 in a plan view and is fixed to the small-diameter portion 21 by welding or the like. For example, at least a portion of the flange portion 83 is disposed between the first portion 62 and the small-diameter portion 21. Thus, the first cylindrical portion 81 has a portion connected to the housing and is fixed to the housing.

[0111] The second cylindrical portion 82 is an annular portion located below the first cylindrical portion 81 and having a smaller diameter (e.g., inner diameter) than the first cylindrical portion 81. The second cylindrical portion 82 is a portion that linearly protrudes from the lower end of the first cylindrical portion 81 toward the negative side of the Z axis and contacts the cover portion 11 when gas is generated. The lower end of the second cylindrical portion 82 (the end on the negative side of the Z axis, e.g., the lowermost end) is located lower than the cover portion 11 in a state where no gas is generated (see FIG. 1 ). Figure 3A ) is located at a position below (negative side of Z axis) the lower end (the end on the negative side of Z axis, for example, the lowest end). Figure 3A As shown, the length L1 of the second cylindrical portion 82 from the lower end of the cover 11 to the lower end of the second cylindrical portion 82 is equal to or longer than the length L2 of the notch 11a1 of the cover 11. The second cylindrical portion 82 is not in contact with the pusher 60.

[0112] The protection portion 80 is formed of metal such as stainless steel (SUS), but may be formed of other metals such as aluminum, or may be formed of resin (for example, a resin different from that of the pusher 60 ).

[0113] like Figure 2 As shown in FIG. 1 and FIG. 2 , the elastic members 90 , 92 , 94 , and 96 are elastic members such as rubber and are O-rings formed in an annular shape.

[0114] Elastic member 90 is disposed in a space formed between fixing member 100, igniter 10, and small-diameter portion 21. Fixing member 100 is used to fix igniter 10 disposed in recess 61. Elastic member 90 is in contact with fixing member 100, igniter 10, and small-diameter portion 21, respectively, and is, for example, pressed by fixing member 100, igniter 10, and small-diameter portion 21, respectively.

[0115] Elastic member 92 is disposed in the space formed between the housing (e.g., connecting portion 22), pusher 60, and resin member 40 to prevent the interior space of recess 61 from being spatially connected to conductor 50. Elastic member 92 prevents gas generated by igniter 10 from reaching conductor 50. In this embodiment, elastic member 92 is in contact with the housing, pusher 60, and resin member 40, for example, being pressed by each of the housing, pusher 60, and resin member 40.

[0116] The elastic member 94 is disposed above the conductor 50 and in the space formed between the circumferential recess formed in the resin member 40 and the housing (e.g., the large-diameter portion 23), to prevent the space above the conductor 50 from being spatially connected to the external space. In this embodiment, the elastic member 94 is in contact with each of the resin member 40 and the large-diameter portion 23, for example, being pressed by each of the resin member 40 and the large-diameter portion 23.

[0117] The elastic member 96 is disposed below the conductor 50 and in the space formed between the circumferential recess formed in the resin member 40 and the lower housing 30 (e.g., the side wall 34), to prevent the space below the conductor 50 from being spatially connected to the external space. In this embodiment, the elastic member 96 is in contact with each of the resin member 40 and the side wall 34, for example, being pressed by each of the resin member 40 and the side wall 34.

[0118] In addition, the elastic members 94 and 96 are not limited to being arranged in the circumferential recess without a gap, and a gap may be formed in at least one of the vertical directions.

[0119] [1-2. Cutting action]

[0120] Next, refer to Figure 4A and Figure 4B The cutting operation in the cutting device 1 configured as described above will be described. Figure 4A It is a cross-sectional view for explaining the cutting operation of the cutting device 1 according to this embodiment.

[0121] Figure 4A The cross-sectional structure of the cutting device 1 after the cutting operation is shown. Figure 4B It is a perspective view showing a part of the cover portion 11 of the igniter 10 according to the present embodiment after gas generation.

[0122] In addition, Figure 4A and Figure 4B For convenience, the state in which the opening 11a is opened along the Z-axis direction and the state in which the opening 11a reaches the lowest position is shown. Figure 4A In the figure, the opening 11a and the protection portion 80 are not in contact, but in reality, the opening 11a is opened in a manner that contacts the second tube portion 82. Figure 4B 1 shows an ideal opening state in which the opening 11a is cut along the notch 11a1 when gas is generated. However, in actual products, the opening 11a is not necessarily cut neatly along the notch 11a1. The state in which the opening 11a is opened varies depending on, for example, the amount of explosives.

[0123] like Figure 4A As shown, as for the propulsion member 60, when the igniter 10 is working, its upper surface (pressure surface) receives the energy from the igniter 10, thereby Figure 3A The pusher 60 moves downward at high speed from the initial position shown, separating the separating portion 51 from the holding portion 52, and then integrates the separated separating portion 51 and moves downward at high speed again, so that the separating portion 51 contacts the protrusion 30a. In this way, the pusher 60 can forcibly and physically cut the conductor 50.

[0124] Furthermore, the protrusion 30a is pressed downward by the pusher 60. Thus, the deformation of the protrusion 30a can absorb the impact (stress) from the pusher 60. Furthermore, even if the pusher 60 moves further downward, a portion of the pusher 60 (e.g., at least a portion of the recess 61) remains above the cut surface 53. This increases the insulation distance between the cut surfaces 53 of the conductor 50, thereby suppressing the occurrence of arcing when the conductor 50 is cut.

[0125] Figure 4A and Figure 3C The length L1 shown is the distance from the lower end of the cover 11 to the lower end of the protective portion 80. Furthermore, as mentioned above, the length L2 is half the length of the notch 11a1 of the opening 11a. The length L2 is less than the length L1. Due to this length relationship, when the opening 11a is opened downward, the protective portion 80 acts as a barrier to prevent the opening 11a from being widely opened, thereby preventing the opened opening 11a from contacting the recess 61 of the pusher 60.

[0126] In addition, if Figure 4A As shown, the protection portion 80 is stationary during the cutting operation and does not move together with the pusher 60 .

[0127] (Various Modifications of Embodiment 1)

[0128] Below, refer to Figures 5A to 5D Various modifications applicable to Embodiment 1 will be described. The following description will focus on differences from Embodiment 1, and descriptions of the same or similar matters as those of Embodiment 1 will be omitted or simplified.

[0129] Figures 5A to 5D These are cross-sectional views showing cutting devices according to various modifications of the first embodiment. Figures 5A to 5D The cutting device shown is different from the cutting device 1 of the first embodiment in the shape of the protection portion and the like.

[0130] like Figure 5A As shown, the protection portion 80a of the cutting device 1a includes a first cylindrical portion 81a and a second cylindrical portion 82a.

[0131] The first cylindrical portion 81a is a cylindrical portion that surrounds the side of the igniter 10, and at least a portion thereof has a shape that conforms to the igniter 10. In the present embodiment, the first cylindrical portion 81a is formed in a stepped shape (a single-step shape) in which the diameter (e.g., inner diameter) gradually decreases as it goes downward in a cross-sectional view.

[0132] The second barrel portion 82a is a cylindrical portion that is located below the first barrel portion 81a and has a smaller diameter (e.g., inner diameter) than the first barrel portion 81a. The second barrel portion 82a protrudes linearly from the lower end of the first barrel portion 81a toward the negative side of the Z axis, and the length of the second barrel portion 82a in the Z axis direction is, for example, longer than the length of the first barrel portion 81a in the Z axis direction. In addition, the lower end of the second barrel portion 82a (the end on the negative side of the Z axis, e.g., the lowermost end) is located lower than the cover portion 11 (refer to FIG. 1 ) in a state where no gas is generated. Figure 3A ) is positioned downward (on the negative side of the Z axis) of the lower end (the end on the negative side of the Z axis, for example, the lowest end).

[0133] In the thus configured protection portion 80a, the number of steps of the first cylindrical portion 81a is smaller than that of the igniter 10, and the linear portion is longer, so that manufacturing is easy.

[0134] Furthermore, the recessed portion 61 a includes a first portion 62 and a second portion 64 .

[0135] The first portion 62 is a portion whose diameter (eg, inner diameter) decreases downward at a predetermined curvature.

[0136] The second portion 64 is located below the first portion 62 and has an inner surface parallel to the Z-axis direction in a cross-sectional view. The second portion 64 is provided so as to face at least a portion of the second cylindrical portion 82a in a cross-sectional view.

[0137] The shape of the recessed portion 61 a may correspond to the shape of the protecting portion 80 a .

[0138] like Figure 5B As shown, the protection portion 80b of the cutting device 1b includes a first cylindrical portion 81 and a second cylindrical portion 82b.

[0139] The second barrel 82b is a cylindrical portion that is located below the first barrel 81 and has a diameter (e.g., inner diameter) that is smaller than the first barrel 81. The second barrel 82b protrudes from the lower end of the first barrel 81 toward the negative side of the Z axis and has an inclined portion 82b1 whose lower end is tilted inward. The lower end of the second barrel 82b can also be said to be bent inward. The inclined portion 82b1 may be provided in a shape, direction, etc. that protrudes inwardly in a manner tilted relative to the Z axis direction when viewed in cross-section.

[0140] The opening diameter (length L3) of the lower portion of the second cylindrical portion 82b is, for example, larger than the notch 11a1 (see Figure 3C ) is smaller than the length (2×L2). The length L3 is the shortest distance between the ends of the inclined portions 82b1. The diameter of the opening 11a corresponds to the diameter of the cover 11.

[0141] The second cylindrical portion 82b is, for example, a portion that contacts the cover portion 11 when gas is generated. Furthermore, the lower end of the second cylindrical portion 82b (the end on the negative side of the Z axis, for example, the lowermost end) is located below (on the negative side of the Z axis) the lower end of the cover portion 11 (the end on the negative side of the Z axis, for example, the lowermost end) when gas is not being generated.

[0142] As described above, since the protection portion 80b has the inclined portion 82b1, the pressure of the gas generated by the igniter 10 can be further concentrated inward, thereby reducing the amount of explosives.

[0143] Furthermore, the recessed portion 61 b includes a first portion 62 and a second portion 65 .

[0144] The second portion 65 is located below the first portion 62 and has a shape (curved) that follows the second cylindrical portion 82b. For example, by following the inclined portion 82b1, the second portion 65 can be thicker in the direction perpendicular to the Z-axis than if the second cylindrical portion 82b were formed solely of a straight portion. This improves the strength of the recessed portion 61 of the pusher 60.

[0145] like Figure 5C As shown, the protective portion 80c of the cutting device 1c has a metal portion 110 and a resin portion 112. The protective portion 80c has a double-layer structure of the metal portion 110 and the resin portion 112. The structure of the metal portion 110 is the same as that of the protective portion 80 described above, and its description is omitted. In addition, the metal portion 110 and the resin portion 112 are formed integrally, for example. The resin portion 112 can also be formed on the inner surface of the metal portion 110 by coating, etc. The resin portion 112 can also be formed on the surface of the metal portion 110 by coating, etc. In addition, integrally formed means that two elements are formed as a whole, which means that one is mounted on the other in a non-detachable manner.

[0146] In addition, the metal part 110 and the resin part 112 are not limited to being formed in one piece, but may be separate, with one being mounted on the other in a manner that allows for loading and unloading. In the case where the metal part 110 and the resin part 112 are capable of loading and unloading (being different components), the metal part 110 is an example of a metal component, and the resin part 112 is an example of a resin component. Alternatively, the resin component may be, for example, a sheet-like component made of resin, which is arranged along the metal component. In addition, being capable of loading and unloading means that the metal part 110 and the resin part 112 are connected in such a manner that they can be installed and disassembled without being accompanied by damage or plastic deformation.

[0147] The resin portion 112 covers the portion of the inner surface of the metal portion 110 that is lower than the cover portion 11. In this embodiment, the resin portion 112 covers the entire inner surface of the metal portion 110. In addition, the distance from the lower end of the cover portion 11 to the lower end of the resin portion 112 (here, the length L1) is equal to or greater than half the size of the opening portion 11a of the cover portion 11. Figure 5C In the example shown in FIG, the distance from the lower end of the cover 11 to the lower end of the resin portion 112 is equal to the distance from the lower end of the cover 11 to the lower end of the metal portion 110, for example, length L1. Furthermore, the vertical length from the upper end of the resin portion 112 to the lower end of the resin portion 112 is length L4.

[0148] like Figure 5D As shown, the protection portion 80 d of the cutting device 1 d includes a metal portion 110 and a resin portion 120 .

[0149] Resin portion 120 covers the portion of the inner surface of metal portion 110 below lid portion 11. In this embodiment, resin portion 120 covers the lower end (front end) of metal portion 110, embedding and securing metal portion 110 therein. The inner surface of resin portion 120 contacts the outer surface of metal portion 110. Metal portion 110 is an example of a metal component, and resin portion 120 is an example of a resin component.

[0150] Resin portion 120 includes a first portion 121 disposed inside metal portion 110, a second portion 122 disposed outside metal portion 110, and a third portion 123 connecting first portion 121 and second portion 122. At least a portion of third portion 123 is located below metal portion 110. In other words, the lower end of metal portion 110 is not exposed. Resin portion 120 is a cap-shaped member, and its cross-section is, for example, U-shaped.

[0151] Furthermore, the vertical length from the upper end to the lower end of the first portion 121 may be, for example, greater than the vertical length from the lower end of the cover 11 to the lower end of the second cylindrical portion 82. Furthermore, the vertical length from the upper end to the lower end of the second portion 122 may be, for example, less than the vertical length from the lower end of the cover 11 to the lower end of the second cylindrical portion 82.

[0152] Alternatively, the resin portion 120 may be formed by coating or the like so as to cover the lower end portion of the metal portion 110 from the inner side to the outer side.

[0153] (Manufacturing Method)

[0154] Next, refer to Figure 6 A method for manufacturing the cutting device according to the first embodiment and its various modifications configured as described above will be described. Figure 61 is a flowchart showing the manufacturing process of the cutting device 1 according to the first embodiment. Figure 6 Detailed description is given of the manufacturing process of the cutting device 1 according to the first embodiment.

[0155] like Figure 6 As shown, the upper housing 20 is manufactured by molding or the like (S10), and the lower housing 30 is manufactured by molding or the like (S20). Alternatively, step S10 may be performed after step S20.

[0156] In step S10, the protection portion 80 is further provided on the upper housing 20. For example, the protection portion 80 is fixed to the upper housing 20 by welding, etc. In step S20, the protrusion 30a is formed simultaneously with the molding of the lower housing 30.

[0157] Next, the upper housing 20 and the lower housing 30 are fixed together ( S30 ). For example, with the igniter 10 , the resin member 40 , the conductor 50 , the pusher 60 , and the protective portion 80 housed therein, the upper housing 20 and the lower housing 30 are fixed together without any gaps using a fastening member or the like. Thus, the aforementioned cutting device 1 is manufactured.

[0158] (Implementation Method 2)

[0159] Below, refer to Figure 7 The cutting device of this embodiment will be described. In addition, the following description will focus on the differences from the first embodiment, and the description of the same or similar contents as the first embodiment will be omitted or simplified.

[0160] Figure 7 2 is a cross-sectional view showing the cutting device 2 of this embodiment. The cutting device 2 of this embodiment is different from the cutting device 1 of the first embodiment in that the protection portion 130 is provided on the pusher 60 side.

[0161] like Figure 7 As shown, the cutting device 2 of this embodiment includes a protection portion 130 instead of the protection portion 80 of the cutting device 1 of the first embodiment.

[0162] The protection portion 130 is configured to cover the inner surface of the recess 61 of the pusher 60. For example, the protection portion 130 may be configured to cover the inner surface of the recess 61 in contact with the inner surface of the recess 61. For example, the protection portion 130 may be configured to cover a portion of the inner surface of the recess 61 that is lower than the cover 11. For example, the protection portion 130 may be configured to cover the entire inner surface of the recess 61 that is located lower than the cover 11. In addition, for example, the protection portion 130 may be configured to be located between the cover 11 and the pusher 60. In addition, covering the entire inner surface here means, in addition to completely covering the entire inner surface, also including substantially covering the entire inner surface (for example, covering more than 80% of the surface area of the inner surface).

[0163] The protection portion 130 is a metal layer formed of a metal or an insulating layer formed of an insulating material. For example, the protection portion 130 is formed of a metal such as stainless steel (SUS) when it is a metal layer, but can also be formed of other metals such as aluminum. By having the protection portion 130 be a metal layer, the strength of the protection portion 130 can be increased, thereby more reliably suppressing the breakage of the pusher 60. In addition, for example, the protection portion 130 can be formed of a material different from that of the pusher 60 when it is an insulating layer. For example, the protection portion 130 can be formed of a material harder than that of the pusher 60 when it is an insulating layer. The insulating layer can also be formed of silicon oxide such as SiO2, silicon nitride such as SiN, silicon oxynitride such as SiON. By having the protection portion 130 be an insulating layer, it is possible to suppress the opening 11a and the shell from being connected via the protection portion 130.

[0164] The protection portion 130 is formed integrally with the pusher 60 by, for example, coating the inner surface of the recess 61 .

[0165] Furthermore, the protection portion 130 is not limited to being integrally formed with the propulsion member 60 and may be a separate body. For example, the protection portion 130 may be a separate body having a shape that conforms to the inner surface of the recess 61. For example, the protection portion 130 may be placed on the inner surface of the recess 61 or spaced apart from the inner surface of the recess 61. In the former case, the inner surface of the recess 61 and the protection portion 130 are in surface contact, for example.

[0166] In this way, when the protection portion 130 and the pusher 60 are not integrally formed, the protection portion 130 is an example of a metal member formed of a metal layer or an insulating member formed of an insulating layer made of a material different from that of the pusher 60. In other words, the protection portion 130 may be a metal member or an insulating member provided inside the recess 61, and the metal member or insulating member may be provided between the cover 11 and the pusher 60.

[0167] Alternatively, the protection portion 130 may have a double-layer structure in which an insulating layer is formed on a metal layer.

[0168] In this embodiment, the protection portion 130 moves downward together with the pusher 60 due to the cutting operation.

[0169] In such a cutting device 2 , as in the first embodiment, the protection portion 130 can prevent the opening 11 a opened by the igniter 10 generating gas from coming into contact with the pusher 60 and damaging the recessed portion 61 of the pusher 60 .

[0170] (Structure of other cutting devices)

[0171] Reference Figure 8 and Figure 9 A cutting device having a different structure of the separation portion 51 will be described. Figure 8 It is a cross-sectional view showing a cutting device according to another embodiment. Figure 9 Is used to illustrate Figure 8 This is a cross-sectional view of a cutting device according to another embodiment shown in a state where a separation portion has moved downward.

[0172] In addition, about Figure 8 、 Figure 9 , the same components as those of the above-mentioned cutting devices 1, 1a, 1b, 1c, 1d, and 2 are denoted by the same reference numerals, and description thereof is omitted.

[0173] In the aforementioned cutting device 1, the pusher 60 receives the pressure of the gas generated by the igniter 10 and separates the separating portion 51 from the conductive body 50, thereby moving the separating portion 51 downward. In other words, by separating the separating portion 51 from the retaining portion 52, the separating portion 51 and the retaining portion 52 are disconnected, and as a result, the conductive body 50 is disconnected. However, the cutting device disclosed herein does not necessarily require a structure that separates the separating portion 51.

[0174] For example, it can also be, Figure 7 and Figure 8 As shown, the pusher 60 receives the pressure of the gas generated by the igniter 10 and moves the separation portion downward, thereby rendering the conductor 50 non-conductive. In other words, the conductor 50 may be rendered non-conductive by moving the separation portion 51 in contact with the holding portion 52 downward to separate the separation portion 51 from the holding portion 52.

[0175] (Other embodiments)

[0176] While one or more cutting devices have been described above based on various embodiments, the present disclosure is not limited to these embodiments. Various modifications of the present embodiments, as conceived by those skilled in the art, and configurations that combine components from different embodiments are also encompassed within the present disclosure, without departing from the spirit of the present disclosure.

[0177] For example, in the above-described embodiments, the case is described as being made of metal. However, the present invention is not limited thereto. For example, the lower case of the case may be made of a resin having a deformable property.

[0178] Furthermore, in the above-mentioned embodiment 1, Figure 3B and Figure 3C The form (number, shape, etc.) of the notch shown is an example, and is not limited thereto as long as the cover is in a desired open state. In addition, the notch may not be provided in the cover. Figure 4B In the example, the opening 11a is only cracked at the notch 11a1, but in the actual product, the crack may reach the outer frame 11b. In other words, the opening 11a of the actual product may be larger than the notch 11a1. Figure 4B The opening 11a shown is large.

[0179] In the above embodiments, the lower end of the protection portion may be bent outward as long as it does not contact the pusher. Outward refers to the direction from the inside of the cutting device toward the outside of the cutting device when viewed from above.

[0180] In addition, the order of the steps in the manufacturing method of the cutting device described in the above embodiments may be reversed. In addition, the steps in the manufacturing method of the cutting device described in the above embodiments may be performed in one step or in different steps. In addition, the intention to perform in one step includes the situation where each step is performed using one device, each step is performed continuously, or each step is performed in the same place. In addition, the intention to perform different steps includes the situation where each step is performed using different devices, each step is performed at different times (e.g., different dates), or each step is performed in different places.

[0181] Industrial applicability

[0182] The present disclosure is useful for a disconnecting device or the like disposed in an electric circuit.

[0183] Description of Reference Numerals

[0184] 1. 1a, 1b, 1c, 1d, 2. Cutting device; 10. Igniter; 11. Cover; 11a. Opening; 11a1. Notch; 11b. Outer frame; 20. Upper housing; 21. Small-diameter portion; 22. Connecting portion; 23. Large-diameter portion; 30. Lower housing; 30a. Protrusion; 33. Bottom portion; 34. Sidewall; 40. Resin member; 41. Embedded portion; 42. 81. 81a. First barrel; 43. 82. 82a. 82b. Second barrel; 50. Conductor; 51. Separating portion; 52. Holding portion; 53. Cutting surface; 60. Pusher; 61, 61a, 61b, recess; 62, first portion; 63, 64, 65, second portion; 70, space; 80, 80a, 80b, 80c, 80d, 130, protective portion; 82b1, inclined portion; 83, flange portion; 90, 92, 94, 96, elastic member; 100, fixing member; 110, metal portion (metal member); 112, 120, resin portion (resin member); 121, first portion; 122, second portion; 123, third portion; L1, L2, L3, L4, length.

Claims

1. A cutting device, wherein: The cutting device has: case; a propulsion member located inside the housing and having a recess; an igniter, which holds gunpowder inside, has a cover portion provided between the gunpowder and the propelling member, is disposed in the recessed portion, and is capable of generating gas; a protection portion provided on the housing or the igniter and located inside the recess; as well as an electrical conductor having a separation portion located below the propulsion member, The pusher moves the separation portion downward when receiving the pressure of the gas generated by the igniter. The cover has an opening configured to open in response to the pressure of the gas. The lower end of the protection portion is located below the lower end of the cover portion.

2. The cutting device according to claim 1, wherein: The protection portion comprises: a first cylindrical portion connected to the housing; and The second cylindrical portion is located below the first cylindrical portion and has a diameter smaller than that of the first cylindrical portion.

3. The cutting device according to claim 2, wherein: The recess of the pusher has: a first portion having a diameter larger than a diameter of the first cylindrical portion; and The second portion is located below the first portion and has a diameter larger than that of the second cylindrical portion. The diameter of the first portion is larger than the diameter of the second portion.

4. The cutting device according to claim 2 or 3, wherein: A distance from a lower end of the cover to a lower end of the second cylindrical portion is equal to or longer than half a length of a notch provided in the opening of the cover.

5. The cutting device according to any one of claims 2 to 4, wherein The diameter of the opening below the protection portion is smaller than the diameter of the cover portion.

6. The cutting device according to any one of claims 2 to 5, wherein: The housing is made of metal. The protection portion comprises: a metal member connected to the housing; and a resin member disposed inside the metal member, The metal component includes the first cylindrical portion and the second cylindrical portion, A vertical length from an upper end of the resin member to a lower end of the resin member is greater than a vertical length from a lower end of the cover portion to a lower end of the second cylindrical portion.

7. The cutting device according to claim 6, wherein: The resin member has: Part 1, which is disposed on the inner side of the metal component; a second portion disposed on the outer side of the metal member; and Part 3, which connects said part 1 and said part 2, The third portion is located below the metal component.

8. The cutting device according to any one of claims 2 to 5, wherein The protection portion includes a resin portion and a metal portion, The resin portion and the metal portion are integrally formed, The resin portion covers a portion of the inner surface of the metal portion that is below the cover portion.

9. The cutting device according to claim 8, wherein: A distance from a lower end of the cover portion to a lower end of the resin portion is equal to or greater than a half length of a notch provided in the opening portion of the cover portion.

10. The cutting device according to claim 8 or 9, wherein: The resin portion has: a first portion disposed on an inner side of the metal portion; a second portion disposed outside the metal portion; and Part 3, which connects said part 1 and said part 2, The third portion is located below the metal portion.

11. A cutting device, wherein: The cutting device has: case; a propulsion member located inside the housing and having a recess; an igniter, which holds gunpowder inside, has a cover portion provided between the gunpowder and the propelling member, is disposed in the recessed portion, and is capable of generating gas; a protective portion configured to cover an inner surface of the recess; as well as an electrical conductor having a separation portion located below the propulsion member, The pusher moves the separation portion downward when receiving the pressure of the gas generated by the igniter.

12. The cutting device according to claim 11, wherein: The protection portion covers a portion of the inner surface of the recessed portion that is below the cover portion.

13. The cutting device according to claim 11 or 12, wherein: The protection portion is a metal layer covering the inner surface of the recess, or an insulating layer covering the inner surface of the recess and made of a material different from that of the propulsion member. The protection portion is located between the cover portion and the propulsion member.

14. The cutting device according to claim 11 or 12, wherein: The protection portion is a metal member or an insulating member provided inside the recess. The metal member or the insulating member is located between the cover and the propulsion element.

15. The cutting device according to any one of claims 11 to 14, wherein The protection portion covers the entire inner surface of the recessed portion located below the cover portion.

16. The cutting device according to any one of claims 11 to 15, wherein: The protection portion is configured to come into contact with the cover portion when the gas is generated.

17. The cutting device according to any one of claims 1 to 16, wherein: When the pusher receives the pressure of the gas generated by the igniter, it separates the separation portion from the conductor and moves the separation portion downward.

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