Electrical circuit breaker device

Abstract

Electrical protective switching device (1), comprising: a housing (10) made of synthetic resin; a rod-like projectile (40) made of synthetic resin and arranged in the housing (10); a conductor section (50) arranged in the housing (10) to extend over a front face of an end section of the rod-like projectile (40); and a detonator (20) which is arranged in the housing (10) to face another end section of the rod-like projectile (40) and is configured, to generate pressure to fire the rod-like projectile (40) in the direction of the conductor section (50), wherein the conductor section (50) comprises a first circuit board (53a) extending over the front face of one end section of the rod-like projectile (40) and comprising a recess section (54), characterized by the fact that the conductor section (50) further comprises a second circuit board (53b) which is coupled to the recess section (54) of the first circuit board (53a), and the first printed circuit board (53a) comprises two slots (56) and a thin section formed between them, and the second printed circuit board (53b) comprises two web sections (57) that fit together with the two respective slots (56) of the first printed circuit board (53a) or are pressed into the two respective slots (56) of the first circuit board (53a).

Description

Technical field

[0001] The present invention relates to an electrical circuit breaker device that can be used in an electrical circuit for a vehicle, household electrical appliance or the like. background

[0002] Electrical circuit breakers are used to prevent major damage, for example, under abnormal conditions in the electrical circuit of a vehicle, household appliance, or the like, or to the entire electrical system, including a battery, by interrupting the electrical circuit. Electrical circuit breakers are especially important for the electrical circuits of electric vehicles. Examples of electrical circuit breakers include those containing a detonator, a projectile (piston), a conductor, and the like within a housing (US 2005 / 0083164A, US 2005 / 0083165A, US 2012 / 0234162A, JP H11-232979A, JP 2014-49300A, and JP 2016-85947A).

[0003] EP 1 883 091 A discloses a pyromechanical cutting device comprising a plastic housing, a one-piece molded, movable cutting element, and a pyrotechnic ignition element. Before activation, the cutting element is integrally connected to the housing via a shearable connecting bridge; upon ignition, gas pressure builds up, shearing off the bridge and driving the cutting element to sever a conductor supported on an abutment with a recess. Further embodiments show, inter alia, a U-shaped conductor, a guide for the cutting element by the connecting bridge and ignition section, and optional pressure-limiting slots.

[0004] US 2013 / 0126326A1 discloses an electrical switch comprising a hollow body and a cavity containing a slide actuated by a pyrotechnic gas generator. The conductive portion of the slide is connected to primary conductor studs on the cavity wall via detachable, permanent connections (e.g., welded, soldered, or brazed joints). Upon actuation, these connections shear off, and the slide is moved to open a primary circuit; variations employ projections or ramps to clamp a downstream conductor stud and create a secondary circuit.

[0005] DE 10 2010 011 150 A1 discloses a pyrotechnic fuse for vehicle electrical lines. Two connecting tabs are joined to each other via a conductive connecting element that forms a predetermined breaking point. The tabs and the connecting element seal an ignition chamber; upon ignition, the resulting gas pressure causes the connection to break. Variants show a separation point filled with solder or electroplated metal, as well as designs with dovetail or folded-back connections, in which grooves or notches define bending zones.

[0006] Known electrical circuit breaker devices typically comprise a single printed circuit board (PCB) as a conductor that is cut by a projectile. The PCB is provided with a notched groove to facilitate cutting. However, the section of the PCB containing the notched groove is thinner than the other sections, and therefore, when current is applied, heat builds up in this section. To suppress this heat buildup, the PCB must be thicker, which, however, increases the size of the devices. Summary of the invention

[0007] The present invention overcomes the aforementioned disadvantages by providing an electrical circuit breaker device according to independent claims 1, 5, 6 and 7. Advantageous further developments and preferred embodiments are specified in dependent claims 2, 3 and 4. Brief description of the drawings

[0008] The present invention will be better understood from the following detailed description and the accompanying drawings, which serve only for illustration and do not limit the present invention. Fig. Figure 1 is an exploded perspective view showing an electrical circuit breaker device according to an embodiment of the present invention. Fig. Figure 2 is a cross-sectional view showing an electrical circuit breaker device according to an embodiment of the present invention. Fig. Figure 3 is a cross-sectional view showing a state after actuation of an electrical protective switch device according to an embodiment of the present invention. Fig. 4A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to the first embodiment, and Fig. 4B is a partial cross-sectional view and Fig. 4C is a partial top view of the intervention section. Fig. 5A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to a second embodiment, and Fig. 5B is a partial cross-sectional view, and Fig. 5C is a partial top view of the intervention section. Fig. 6A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to the third embodiment, and Fig. 6B is a partial cross-sectional view, and Fig. 6C is a partial top view of the intervention section. Fig. 7A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to the fourth embodiment, and Fig. 7B is a partial cross-sectional view and Fig. 7C is a partial top view of the intervention section. Fig. 8A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to the fifth embodiment, and Fig. 8B is a partial cross-sectional view and Fig. 8C is a partial top view of the intervention section. Fig. 9A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to the sixth embodiment, and Fig. 9B is a partial cross-sectional view and Fig. 9C is a partial top view of the intervention section. Fig. 10A is a partial cross-sectional view showing a relationship with peripheral components in an engagement section of a conductor section according to the seventh embodiment, and Fig. 10B is a partial cross-sectional view and Fig. 10C is a partial top view of the intervention section. Description of the embodiments

[0009] One object of the present invention is to provide an electrical circuit breaker device comprising a printed circuit board with a structure that minimizes heat generation when energized and allows for easy cutting. A further object of the present invention is therefore to reduce the size of the electrical circuit breaker device.

[0010] The present invention provides an electrical circuit breaker device comprising a housing made of synthetic resin; a rod-like projectile made of synthetic resin and arranged in the housing; a conductor section arranged in the housing to extend over a front face of an end section of the rod-like projectile; and a detonator arranged in the housing to face another end section of the rod-like projectile and configured to generate pressure to fire the rod-like projectile in the direction of the conductor section.

[0011] In one embodiment, the conductor section comprises a first circuit board extending over the front face of one end section of the rod-like projectile and comprising a recess section; and a second circuit board coupled to the recess section of the first circuit board.

[0012] In another embodiment, the conductor section comprises a first printed circuit board arranged at the front of one end section of the rod-like projectile, and a second printed circuit board and a third printed circuit board coupled at a corresponding edge section of the second printed circuit board and the third printed circuit board to the respective opposite edge sections of the first printed circuit board.

[0013] The housing may contain a cylindrical space extending from a first-end section side of the housing towards an opposite second-end section side to the center of the housing. The cylindrical space may have a circular cross-sectional shape at a cross-section perpendicular to a central axis of the cylindrical space.

[0014] The detonator can be located at one end of the cylindrical space within the casing. The detonator can comprise a detonator body, which includes a firing section with a detonating charge and connecting pins. Part of the detonator body may be encased in resin.

[0015] A metal cylinder can be pressed into the cylindrical space of the housing.

[0016] The rod-like projectile can be slidably arranged along the cylindrical space within the housing. The rod-like projectile can have a rod section and an enlarged-diameter tip section formed at one end of the rod section. The rod section can have a circular cross-sectional shape perpendicular to the central axis of the rod-like projectile. The rod section can be inserted into the cylindrical space of the housing, or the metal cylinder can be pressed into the cylindrical space. The rod section can have a neck section with a reduced outer diameter along a central section in the longitudinal direction of the rod section. A rubber or resin O-ring can be fitted around the neck section.The enlarged-diameter tip section may have a square or circular cross-sectional shape perpendicular to the central axis of the rod-like projectile. The diameter or length of one side of the enlarged-diameter tip section in cross-section may be greater than the diameter of the rod section. The rod-like projectile may have a single striking face with a square or circular shape at one tip of the enlarged-diameter tip section.

[0017] The ladder section can be arranged to extend over a space at a specified distance, the space extending from the striking surface of one end section of the rod-like projectile in an axial direction of the rod-like projectile. The ladder section can be arranged to extend over the space at a specified distance in a direction perpendicular to the axial direction of the rod-like projectile, the space extending from the striking surface of one end section of the rod-like projectile in the axial direction of the rod-like projectile. The ladder section can be arranged such that a surface of the ladder section is perpendicular to a firing direction of the rod-like projectile. The ladder section can be arranged such that the surface of the ladder section is perpendicular to the axial direction of the rod-like projectile.The conductor surface can be arranged such that the surface of the conductor section is slightly angled with respect to a direction perpendicular to the firing direction of the rod-like projectile. The conductor section can be connected in series with an external circuit. The conductor section can further include a guide-terminal section formed from a circuit board for connection to an external circuit.

[0018] The conductor section can be connected in series with an external circuit.

[0019] The detonator can be energized by an external power source connected to the lead pin, which ignites the ignition charge within the detonator and thereby generates a combustion product, such as combustion gas or a flame, in the cylindrical chamber. The pressure of this combustion product, generated within the cylindrical chamber, propels the rod-like projectile from one end of the chamber towards the lead section.

[0020] The electrical circuit breaker device may further include a stopper made of an insulating material. The stopper may be configured to receive a cut piece generated when the conductor section is cut. The stopper may include a recessed section that opens toward the conductor section. One end of the rod-like projectile may be configured to enter an inner surface of the stopper's recessed section after the conductor section has been cut, in order to collect the cut piece of the conductor section within the recessed section of the stopper. The stopper may be box-shaped.

[0021] The electrical circuit breaker device may further include a metal frame to reinforce the housing. The metal frame may be formed from a curved U-shaped metal plate with cutouts at the positions where the conductor section runs.

[0022] In one embodiment, the conductor section may comprise a first printed circuit board extending over the front face of one end of the rod-like projectile and including a recessed section, and a second printed circuit board coupled to the recessed section of the first printed circuit board. The conductor section may have a uniform thickness. The recessed section of the first printed circuit board may be located on the front face of one end of the rod-like projectile. The first printed circuit board may include a groove, and the second printed circuit board may have a web section that aligns with the groove of the first printed circuit board. In one example, the second printed circuit board may be welded to the first printed circuit board at a central portion of one face of the second printed circuit board.In another example, the second printed circuit board (PCB) can be welded to the first PCB at a multitude of positions along an edge section of one face of the second PCB. The number of weld positions can be two or more. The number of weld positions can be eight or fewer. The number of weld positions can be six or fewer. The number of weld positions can be four or fewer. The rod-like projectile can be configured to, upon impact on an upper face of the second PCB, cut the second PCB and the portion of the first PCB corresponding to the second PCB from the remaining portion of the first PCB.

[0023] In another example, the conductor section can comprise a first circuit board extending across the front face of one end of the rod-like projectile and including a recessed section, and a second circuit board coupled to the recessed section of the first circuit board. The conductor section can have a uniform thickness. The recessed section of the first circuit board can be located on the front face of one end of the rod-like projectile. The first circuit board can include a groove, and the second circuit board can include a recessed section pressed into the groove of the first circuit board. The groove can taper slightly toward an open end, and conversely, the recessed section can taper slightly to be wider toward a tip of the recessed section.The rod-like projectile can be configured to, upon impact on an upper surface of the second circuit board of the conductor section, cut the second circuit board and part of the first circuit board corresponding to the second circuit board from the remaining part of the first circuit board.

[0024] In yet another embodiment, the conductor section can comprise a first printed circuit board (PCB) arranged on the front face of one end section of the rod-like projectile, and a second and third PCB coupled at corresponding edge sections of the second and third PCBs to opposite edge sections of the first PCB. The PCBs can have a uniform thickness. The first PCB and each of the second and third PCBs can be arranged to slightly overlap at corresponding edge sections of the second and third PCBs and welded together at overlapping sections between the first PCB and a corresponding edge section of the second and third PCBs. The number of weld positions can be two or more.The number of welding positions can be eight or fewer. The number of welding positions can be six or fewer. The number of welding positions can be four or fewer. The rod-like projectile can be configured to, upon impact with the top surface of the first circuit board of the conductor section, cut the first circuit board from the second circuit board and the third circuit board at the welding position(s).

[0025] In yet another embodiment, the conductor section can comprise a first printed circuit board arranged on the front face of one end section of the rod-like projectile, and a second printed circuit board and a third printed circuit board coupled at corresponding edge sections of the second printed circuit board and the third printed circuit board to opposite edge sections of the first printed circuit board. The first printed circuit board, the second printed circuit board, and the third printed circuit board can have the same thickness.In one example, the first printed circuit board (PCB) may include a groove or web section formed in or on each of the upper faces of the opposing edge sections, and each of the second PCB may include a corresponding web section or groove formed on or in a lower face of a corresponding edge section of the second PCB. The first PCB and each of the second and third PCBs may be arranged to overlap at edge sections of the first PCB and a corresponding edge section of the second and third PCBs. Each of the grooves or web sections of the first PCB and the corresponding web section or groove of the second and third PCBs may be pressed into one another.In another example, the first printed circuit board (PCB) can include a groove or web section formed in or on each of the side faces of the opposite edge sections, and each of the second PCBs can include a corresponding web section or groove formed on or in a side face of the corresponding edge sections of the second PCB and the third PCB. The first PCB and each of the second PCB and the third PCB can be arranged to be flush with each other at the edge sections of the first PCB and a corresponding one of the second PCB and the third PCB in such a way that they abut each other.Each of the slots and recess sections of the first printed circuit board and the corresponding groove sections of the second and third printed circuit boards can be pressed together. The rod-like projectile can be configured to cut at the press-fit positions upon impact with the top surface of the first printed circuit board, the conductor section of the second printed circuit board, and the third printed circuit board.

[0026] In yet another embodiment, the conductor section can comprise a first printed circuit board (PCB) arranged on the front face of one end section of the rod-like projectile, and a second and third PCB coupled at corresponding edge sections of the second and third PCBs to opposite edge sections of the first PCB. The first PCB can include upper back-folding sections at the respective opposite edge sections, and each of the second and third PCBs can include a lower back-folding section at the edge section of the second and third PCBs. The lower back-folding section of each of the second and third PCBs can engage with and compress a corresponding upper back-folding section of the first PCB.The rod-like projectile can be configured to, upon impact with the upper surface of the first circuit board of the conductor section, cut the first circuit board from the second circuit board and the third circuit board at the compression positions. Embodiments of the invention

[0027] Next, an embodiment of the present invention will be described in more detail with reference to the drawings.

[0028] Fig. Figure 1 is an exploded perspective view of an electrical circuit breaker device according to an embodiment of the present invention. The electrical circuit breaker device comprises a housing 10 made of synthetic resin, a detonator 20 arranged in the housing 10, a metal cylinder 30, a rod-like projectile 40 made of synthetic resin, a conductor section 50, and a stopper 60 made of insulating material. The metal cylinder 30 is attached to the housing 10 through an opening formed in a bottom section of the housing 10. The detonator 20 and the rod-like projectile 40 are inserted into the metal cylinder 30 through the opening formed in the bottom section of the housing 10. The conductor section 50 and the stopper 60 are attached to a front face of the housing 10.

[0029] Fig. 2 is a cross-sectional view of an electrical circuit breaker device 1, which is formed by assembling the components shown in Fig. The cross-sectional view of the components shown in 1 is obtained when the electrical circuit breaker device 1 is viewed along the YZ plane at a central position of its x-axis.

[0030] The housing 10 has a cylindrical space 13 therein, the cylindrical space 13 extending from a first-end-section-11 side of the housing 10 towards an opposite second-end-section-12 side to a center of the housing 10. The cylindrical space 13 has a cylindrical cross-sectional shape with a cross-section perpendicular to the central axis of the cylindrical space 13. The outer shape of the housing 10 can be suitably determined according to the shape of a section to which the electrical protective switch 1 will be attached.

[0031] At one end of the cylindrical space 13, the detonator 20 is positioned in close proximity to a tip-end section 45 of the rod-like projectile 40, so that it faces the tip-end section 45, and generates pressure to fire the rod-like projectile 40 in the direction of the conductor section 50. The detonator 20 comprises a detonator body 22, which includes a firing section 21 with a detonating charge, and power pins 23 connected to the firing section 21. A portion 22 of the detonator body 22 is encased in resin.

[0032] The metal cylinder 30 is arranged in the cylindrical space 13 of the housing 10 by pressing or similar means. However, the metal cylinder 30 serves to reinforce the housing 10 and can be omitted if the housing 10 has sufficient strength.

[0033] The rod-like projectile 40 is slidably arranged along the cylindrical space 13 in the housing 10. The rod-like projectile 40 comprises a rod section 41 and an enlarged-diameter tip section 42 formed at the tip of the rod section 41. The rod section 41 has a circular cross-sectional shape with a cross-section perpendicular to the central axis of the rod-like projectile 40. The rod section 41 is inserted into the cylindrical space 13 of the housing 10 or into the metal cylinder 30, which is arranged in the cylindrical space 13. The rod section 41 may have a neck section 43 with a reduced outer diameter in a central section along the longitudinal direction of the rod section 41. For sealing, an O-ring 44 made of rubber (e.g., silicone rubber) or synthetic resin may be fitted into the neck section 43.The enlarged-diameter tip section 42 has a square or circular cross-sectional shape at a cross-section perpendicular to the central axis of the rod-like projectile 40. The diameter or length of one side of the enlarged-diameter tip section 42 at the cross-section is larger than the diameter of the rod section 41. The rod-like projectile 40 has a single square or circular striking surface 42a at one tip of the enlarged-diameter tip section 42. The striking surface 42a is preferably square. The striking surface 42a is preferably flat. However, the striking surface 42a may have some unevenness within a region in which the effects of the present invention can be achieved. In one example, the striking surface 42a is perpendicular to a firing direction of the rod-like projectile 40 (i.e., the axial direction of the rod-like projectile 40).

[0034] The conductor section 50 is arranged to extend over a front face of an end section (i.e., the enlarged-diameter tip section) 42 of the rod-like projectile 40 (i.e., a space within a certain distance, the space extending from the striking face 42a of the end section 42 of the rod-like projectile 40 in the axial direction of the rod-like projectile 40). This certain distance can be a movable distance (see Fig. 3) of the rod-like projectile 40 and can be defined as a distance from the striking surface 42a to a bottom surface of a recessed section 61 of the stopper 60, which will be described later. The conductor section 50 is preferably arranged to extend over a front face of the end section 42 of the rod-like projectile 40 in a direction perpendicular to the firing direction of the rod-like projectile 40 (i.e., the axial direction of the rod-like projectile 40). The conductor section 50 is preferably arranged such that a surface of the conductor section 50 is perpendicular to the firing direction of the rod-like projectile 40 (i.e., the axial direction of the rod-like projectile 40).However, the conductor section 50 can be arranged such that the surface of the conductor section 50 is slightly angled with respect to a direction perpendicular to the firing direction of the rod-like projectile 40 within a region in which the conductor section 50 can be cut by the rod-like projectile 40. In the example in . Fig. In Figure 2, the conductor section 50 is curved to form a U-shape within the housing 10; however, the conductor section 50 does not necessarily have to be curved. In another example, the conductor section 50 can be formed by a flat printed circuit board. The conductor section 50 is connected in series with an external circuit (not shown) when the electrical circuit breaker 1 is used and serves to cut the external circuit when the device 1 is in operation. The conductor section 50 further includes conductor connection sections 51 and 52, which are formed by respective printed circuit boards for connecting to the external circuit (not shown). Each of the illustrated conductor sections 51 and 52 is formed from a curved printed circuit board for convenient attachment to the housing 10; however, the shape of the conductor connection sections 51 and 52 is not restricted to a curved form.In another example, each of the line connection sections 51 and 52 can be formed by a flat printed circuit board. Details of the printed circuit board 50 will be given later with reference to [reference to be added]. Fig. 4 to Fig. 9 described.

[0035] If an abnormality occurs in the external circuit, the detonator 20 is energized by an external power source (not shown) connected to the conductor pins 23. The ignition charge in the ignition section 21 combusts, producing a combustion product, such as a combustion gas or a flame, in the cylindrical chamber 13. The pressure of the combustion product generated in the cylindrical chamber 13 propels the rod-like projectile 40 from an end section of the cylindrical chamber 13 toward the conductor section 50. The end section 42 of the propelled rod-like projectile 40 collides with the conductor section 50, thereby cutting through it, as shown in Fig. 3 shown.

[0036] The stopper 60 serves to receive a cut piece that is generated when the conductor section 50 is cut. The stopper 60 consists of an insulating material and includes a recessed section 61 that opens towards the conductor section 50. After the conductor section 50 is cut, the end section 42 of the rod-like projectile 40 enters an inner surface of the recessed section 61 of the stopper 60 to receive the cut piece of the conductor section 50 within the recessed section 61 of the stopper 60. This prevents any unintentional short circuit and / or arcing caused by the cut piece. In one example, the stopper 60 has a box shape. However, the outer shape of the stopper 60 can be modified according to the shape of the mounting section.

[0037] The electrical circuit breaker device 1 may further comprise a metal frame 70 for reinforcing the housing 10. In one example, the metal frame 70 is formed from a curved metal plate having a U-shape with cutouts at the positions where the conductor section 50 passes. However, the shape of the metal frame 70 can be within a range where the strength of the housing 10 can be improved without interfering with the functions of the other components of the device 1. The metal frame 70 can be omitted if the housing 10 has sufficient strength.

[0038] Fig. 4 represents a part of a conductor section 50a according to the first embodiment of the conductor section 50, which is in Fig. 1 to Fig. 3 is shown. The remaining part is similar to the conductor section 50, which is shown in Fig. 1 to Fig. The conductor section 50a is structured as shown in Figure 3. It comprises a first circuit board 53a, which extends over the front face of the end section 42 of the rod-like projectile 40 and includes a recess section 54 (comprising two slots 56 and a thin section formed between the slots 56), and a second circuit board 53b, which is coupled to the recess section 54 of the first circuit board 53a. The second circuit board 53b serves to supplement the thickness of the recess section 54 of the first circuit board 53a. In one example, the conductor section 50a has a uniform thickness t. In another example, the conductor section 50a has a non-uniform thickness. The recess section 54 of the first circuit board 53a and the second circuit board 53b are located on the front face of the end section 42 of the rod-like projectile 40.The first circuit board 53a includes two slots 56 to facilitate cutting the conductor section 50a, and the second circuit board 53b includes two web sections 57 that align with the two respective slots 56 of the first circuit board 53a. The two slots 56 of the first circuit board 53a are formed at the positions corresponding to the edge sections of the striking surface 42a of the end section 42 of the rod-like projectile 40. The second circuit board 53b is connected to the recessed section 54 of the first circuit board 53a by aligning the web sections 57 with the respective slots 56, and is spot-welded to the first circuit board 53a at a single central section 55 of a lower surface of the second circuit board 53b.The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50a, cuts the second circuit board 53b and a portion of the first circuit board 53a corresponding to the second circuit board 53b from the remaining portion of the first circuit board 53a. In this example, the recess section 54 of the first circuit board 53a is formed on an upper surface of the first circuit board 53a, and the second circuit board 53b is coupled to the upper surface of the first circuit board 53a; however, an inverted structure is also possible.

[0039] Fig. 5 represents part of a conductor section 50b according to a second embodiment of the present invention. The remaining part is similar to the conductor section 50, which is described in Fig. 1 to Fig. The conductor section 50b is structured as shown in Figure 3. It comprises a first circuit board 53a, which extends over the front face of the end section 42 of the rod-like projectile 40 and includes a recess section 54 (comprising two slots 56 and a thin section formed between the slots 56), and a second circuit board 53b, which is coupled to the recess section 54 of the first circuit board 53a. The second circuit board 53b serves to supplement the thickness of the recess section 54 of the first circuit board 53a. In one example, the conductor section 50b has a uniform thickness t. In another example, the conductor section 50b has a non-uniform thickness. The recess section 54 of the first circuit board 53a and the second circuit board 53b are located on the front face of the end section 42 of the rod-like projectile 40.The first circuit board 53a includes two grooves 56 to facilitate cutting the conductor section 50b, and the second circuit board 53b includes two web sections 57 that align with the two respective grooves 56 of the first circuit board 53a. The two grooves 56 of the first circuit board 53a are formed at the positions corresponding to the edge sections of the striking surfaces 42a of the end section 42 of the rod-like projectile 40. The second circuit board 53b is coupled to the recess section 54 of the first circuit board 53a by aligning the recess section 57 with the respective grooves 56 and is spot-welded to the first circuit board 53a at six positions 55 along edge sections of a lower surface of the second circuit board 53b. In particular, the second circuit board 53b is spot-welded to the tip sections of the recess sections 57 to the bottoms of the slots 56 of the first circuit board 53a.The number of welding positions is not limited to the six positions shown. To ensure stable current supply, the number of welding positions is preferably two or more. To enable cutting, the number of welding positions is preferably eight or fewer. In one example, the number of welding positions is six or fewer. In the other example, the number of welding positions is four or fewer. The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50b, cuts the second circuit board 53b and a portion of the first circuit board 53a corresponding to the distance between the second circuit board 53b and the remaining portion of the first circuit board 53a.In this example, the recess section 54 is formed on an upper side of the first circuit board 53a and the second circuit board 53b is coupled to the upper side of the first circuit board 53a, however, a reverse structure is also possible.

[0040] Fig. Figure 6 represents a part of a conductor section 50c according to a third embodiment of the present invention. The remaining part is similar to the conductor section 50, which is described in Fig. 1 to Fig. The conductor section 50c is structured as shown in Figure 3. It comprises a first circuit board 53a, which extends over the front face of the end section 42 of the rod-like projectile 40 and includes a recess section 54 (comprising two slots 56 and a thin section formed between the slots 56), and a second circuit board 53b, which is coupled to the recess section 54 of the first circuit board 53a. The second circuit board 53b serves to supplement the thickness of the recess section 54 of the first circuit board 53a. In one example, the conductor section 50c has a uniform thickness t. In another example, the conductor section 50c has a non-uniform thickness. The recess section 54 of the first circuit board 53a and the second circuit board 53b are located on the front face of the end section 42 of the rod-like projectile 40.The first circuit board 53a includes the two slots 56 for facilitating the cutting of the conductor section 50c, and the second circuit board 53b includes two web sections 57 that fit into the two respective slots 56 of the first circuit board 53a. The two slots 56 of the first circuit board 53a are formed at the positions corresponding to the respective edge sections of the striking surface 42a of the end section 42 of the rod-like projectile 40. Each of the slots 56 is slightly tapered towards a corresponding open end of the slots 56, and each of the web sections 57 is conversely slightly tapered to be wider towards a corresponding tip of the web sections 57. In the drawing, the tapers are highlighted for clarity. The second circuit board 53b is coupled to the recessed section 54 of the first circuit board 53a by pressing the web sections 57 into the respective slots 56.The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50a, cuts through the second circuit board 53b and a portion of the first circuit board 53a corresponding to the remaining portion of the first circuit board 53a. In this example, the recess section 54 is formed on an upper surface of the first circuit board 53a, and the second circuit board 53b is coupled to the upper surface of the first circuit board 53a; however, a reversed structure is also possible.

[0041] Fig. Figure 7 represents a part of a conductor section 50d according to a fourth embodiment of the present invention. The remaining part is similar to the conductor section 50, which is described in Fig. 1 to Fig. The conductor section 50d is structured as shown in Figure 3. It comprises a first printed circuit board 53c, which is arranged on the front face of the end section 42 of the rod-like projectile 40, and a second printed circuit board 53d and a third printed circuit board 53e, which are coupled at corresponding edge sections of the second printed circuit board 53d and the third printed circuit board 53e to respective opposite edge sections of the first printed circuit board 53c. In other words, a conductor section 50d comprises the second printed circuit board 53d and the third printed circuit board 53e, which are arranged to be flush with each other at a distance, and the first printed circuit board 53c, which connects the second printed circuit board 53d and the third printed circuit board 53e and is arranged on the front face of the end section 42 of the rod-like projectile 40. In one example, the printed circuit boards 53c, 53d, and 53e have the same thickness t.In the other example, the printed circuit boards 53c, 53d, and 53e have different thicknesses. The first printed circuit board 53d and each of the second printed circuit board 53d and the third printed circuit board 53e are arranged such that they overlap at edge sections of the first printed circuit board 53c and a corresponding section of the second printed circuit board 53d and the third printed circuit board 53e, and are welded together at a total of six positions 55 at the overlapping sections between the first printed circuit board and a corresponding section of the second printed circuit board and the third printed circuit board. The number of welding positions is not limited to the six positions shown. To ensure stable current supply, the number of welding positions is preferably two or more. To facilitate cutting, the number of welding positions is preferably eight or fewer. In one example, the number of welding positions is six or fewer.In the other example, the number of welding positions is four or fewer. The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50d, cuts through the second circuit board 53d and the third circuit board 53e, which is located away from the first circuit board 53c at the welding position(s).

[0042] Fig. Figure 8 represents a part of a conductor section 50e according to a fifth embodiment of the present invention. The remaining part is similar to the conductor section 50 described in Fig. 1 to Fig. The conductor section 50e is structured as shown in Figure 3. It comprises a first printed circuit board 53c, which is arranged on the front face of the end section 42 of the rod-like projectile 40, and a second printed circuit board 53d and a third printed circuit board 53e, which are coupled at corresponding edge sections of the second printed circuit board 53d and the third printed circuit board 53e to respective opposite edge sections of the first printed circuit board 53c. In other words, a conductor section 50e comprises the second printed circuit board 53d and the third printed circuit board 53e, which are arranged to be flush with each other at a distance, and the first printed circuit board 53c, which connects the second printed circuit board 53d and the third printed circuit board 53e and is arranged on the front face of the end section 42 of the rod-like projectile 40. In one example, the printed circuit boards 53c, 53d, and 53e have the same thickness t.In the other example, the printed circuit boards 53c, 53d, and 53e have different thicknesses. The first printed circuit board 53c includes web sections 57a and 57b formed on respective upper faces opposite web sections of the first printed circuit board 53c. The second printed circuit board 53d includes a corresponding groove 56a formed in a lower face of an edge section of the second printed circuit board 53d, and the third printed circuit board 53e includes a corresponding groove 56b formed in a lower face of an edge section of the third printed circuit board 53e. Each of the grooves 56a and 56b is slightly tapered towards an open end of the corresponding groove section 56a and 56b, and each of the web sections 57a and 57b is slightly tapered in the opposite direction to be wider towards a tip of the corresponding web section 57a ​​and 57b. For clarity, the tapered sections are highlighted in the drawing.The first printed circuit board 53c and each of the second printed circuit board 53d and the third printed circuit board 53e are arranged to overlap at the edge sections of the first printed circuit board 53c and a corresponding section of the second printed circuit board 53d and the third printed circuit board 53e. The web section 57a ​​of the first printed circuit board 53c and the groove 56a of the second printed circuit board 53d are pressed into each other. The web section 57b of the first printed circuit board 53c and the groove 56b of the third printed circuit board 53e are pressed into each other.In other words, the first printed circuit board 53c and each of the second printed circuit board 53d and the third printed circuit board 53e are arranged to slightly overlap at the edge sections of the first printed circuit board 53c and a corresponding section of the second printed circuit board 53d and the third printed circuit board 53e, and are pressed together in a thickness direction at overlapping sections between the first printed circuit board 53c and a corresponding section of the second printed circuit board 53d and the third printed circuit board 53e. In the example in . Fig. 8, the bridge sections are formed on the first circuit board 53c and the slots are formed in the second circuit board 53d and the third circuit board 53e, however, a reversed structure is also possible. The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50e, cuts the first circuit board 53c from the second circuit board 53d and third circuit board 53e in interference fits.

[0043] Fig. Figure 9 represents a part of a conductor section 50f according to a sixth embodiment of the present invention. The remaining part is similar to the conductor section 50 described in Figure 9. Fig. 1 to Fig. Figure 3 is structured. The conductor section 50f comprises a first printed circuit board 53c, which is arranged on the front face of the end section 42 of the rod-like projectile 40, and a second printed circuit board 53d and a third printed circuit board 53e, which are coupled at corresponding edge sections of the second printed circuit board 53d and the third printed circuit board 53e to respective opposite edge sections of the first printed circuit board 53c. In other words, a conductor section 50f comprises the second printed circuit board 53d and the third printed circuit board 53e, which are arranged to be flush with each other at a distance, and the first printed circuit board 53c, which connects the second printed circuit board 53d and the third printed circuit board 53e and is arranged on the front face of the end section 42 of the rod-like projectile 40. In one example, the printed circuit boards 53c, 53d, and 53e have the same thickness t.In the other example, the printed circuit boards 53c, 53d, and 53e have different thicknesses. The first printed circuit board 53c includes slots 56a and 56b formed in the respective side faces of opposite edge sections of the first printed circuit board 53c; the second printed circuit board 53d includes a corresponding web section 57a ​​formed on a side face of an edge section of the second printed circuit board 53d; and the third printed circuit board 53e includes a corresponding web section 57b formed on a side face of an edge section of the third printed circuit board 53e. Each of the slots 56a and 56b is slightly tapered towards an open end of the corresponding slot 56a and 56b, and each of the web sections 57a and 57b is slightly tapered in the opposite direction to be wider towards a tip of the corresponding web section 57a ​​and 57b. For clarity, the tapered sections are highlighted in the drawing.The first printed circuit board 53c and each of the second printed circuit board 53d and the third printed circuit board 53e are arranged to butt flush against each other at their edge sections. The groove 56a of the first printed circuit board 53c and the web section 57a ​​of the second printed circuit board 53d are pressed into one another. The groove 56b of the first printed circuit board 53c and the web section 57b of the third printed circuit board 53e are pressed into one another. In other words, the first printed circuit board 53c and each of the second printed circuit board 53d and the third printed circuit board 53e are arranged to butt flush against each other at their edge sections and to be pressed into one another in a direction parallel to the surfaces of the printed circuit boards 53c, 53d, and 53e. In the example in . Fig. 9. 56a and 56b are formed in the first circuit board 53c, and the bridge sections 57a and 57b are formed in the second circuit board 53d and the third circuit board 53e respectively; however, a reversed structure is also possible. The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50e, cuts the first circuit board 53c from the second circuit board 53d and the third circuit board 53e in interference fits.

[0044] Fig. 10 represents a part of a conductor section 50g according to a seventh embodiment of the present invention. The remaining part is similar to the conductor section 50, which is described in Fig. 1 to Fig.The conductor section 50d is structured as shown in Figure 3. It comprises a first printed circuit board 53c, which is arranged on the front face of the end section 42 of the rod-like projectile 40, and a second printed circuit board 53d and a third printed circuit board 53e, which are coupled at corresponding edge sections of the second printed circuit board 53d and the third printed circuit board 53e to respective opposite edge sections of the first printed circuit board 53c. In other words, a conductor section 50g comprises the second printed circuit board 53d and the third printed circuit board 53e, which are arranged to be flush with each other at a distance, and the first printed circuit board 53c, which connects the second printed circuit board 53d and the third printed circuit board 53e and is arranged on the front face of the end section 42 of the rod-like projectile 40.The first circuit board 53c includes upper back-fold sections 58a and 58b on their respective opposite edge sections. The second circuit board 53d includes a lower back-fold section 59a on one edge section of the second circuit board 53d, and the third circuit board 53e includes a lower back-fold section on one edge section of the third circuit board. The lower back-fold section 59a of the second circuit board 53d engages with the upper back-fold section 58a of the first circuit board 53c and is compressed in an up-down direction. Similarly, the lower back-fold section 59b of the third circuit board 53e engages with the lower back-fold section 58b of the first circuit board 53c and is compressed in an up-down direction.The end section 42 of the rod-like projectile 40, upon impact with an upper surface of the conductor section 50g, cuts the first circuit board 53c from the second circuit board 53d and the third circuit board 53e into compression positions.

Claims

[1] Electrical protective switching device (1) comprising: a housing (10) made of synthetic resin; a rod-like projectile (40) made of synthetic resin and arranged in the housing (10); a conductor section (50) arranged in the housing (10) to extend over a front face of an end section of the rod-like projectile (40); and a detonator (20) which is arranged in the housing (10) to face another end section of the rod-like projectile (40) and is configured, to generate pressure to fire the rod-like projectile (40) in the direction of the conductor section (50), wherein the conductor section (50) comprises a first circuit board (53a) extending over the front face of one end section of the rod-like projectile (40) and comprising a recess section (54), characterized by , that the conductor section (50) further comprises a second circuit board (53b) which is coupled to the recess section (54) of the first circuit board (53a), and the first printed circuit board (53a) comprises two slots (56) and a thin section formed between them, and the second printed circuit board (53b) comprises two web sections (57) that fit together with the two respective slots (56) of the first printed circuit board (53a) or are pressed into the two respective slots (56) of the first circuit board (53a). [2] Electrical protective switch device (1) according to claim 1, wherein the second printed circuit board (53b) is welded to the first printed circuit board (53a) at a central section (55) of a surface of the second printed circuit board (53b). [3] Electrical protective switch device (1) according to claim 1, wherein the second printed circuit board (53b) is welded to the first printed circuit board (53a) at a plurality of positions (55) along an edge section of a surface of the second printed circuit board (53b). [4] Electrical protective switch device (1) according to any one of claims 1 to 3, wherein one end section of the rod-like projectile (40) has a striking surface (42a), and the two grooves (56) of the first circuit board (53a) are formed at the positions that correspond to the edge sections of the striking surface (42a). [5] Electrical circuit breaker device (1), comprising: a housing (10) made of synthetic resin; a rod-like projectile (40) made of synthetic resin and arranged in the housing (10); a conductor section (50) arranged in the housing (10) to extend over a front face of an end section of the rod-like projectile (40); and a detonator (20) which is arranged in the housing (10) to face another end section of the rod-like projectile (40) and is configured, to generate pressure to fire the rod-like projectile (40) in the direction of the conductor section (50), wherein the conductor section (50) comprises a first circuit board (53c) arranged at the front of one end section of the rod-like projectile (40), characterized by , that the conductor section further comprises a second printed circuit board (53d) and a third printed circuit board (53e) which are coupled at a corresponding edge section of the second printed circuit board (53d) and the third printed circuit board (53e) to the respective opposite edge sections of the first printed circuit board (53c), the first printed circuit board (53c) comprises a groove (56) or a web section (57) formed in or on an upper surface of each of the opposite edge sections, each of the second printed circuit board (53d) and the third printed circuit board (53e) comprises a corresponding web section (57) or a corresponding groove (56) formed on or in a lower surface of a corresponding edge section of the second printed circuit board (53d) and the third printed circuit board (53e), the first printed circuit board (53c) and each of the second printed circuit board (53d) and the third printed circuit board (53e) are arranged to overlap at the edge sections of the first printed circuit board (53c) and a corresponding section of the second printed circuit board (53d) and the third printed circuit board (53e), and each of the slots (56) or each of the web sections (57) of the first printed circuit board (53c) and the bridge section (57) or the groove (56) of a corresponding second printed circuit board (53d) and third printed circuit board (53e) are pressed into each other. [6] Electrical circuit breaker device (1), comprising: a housing (10) made of synthetic resin; a rod-like projectile (40) made of synthetic resin and arranged in the housing (10); a conductor section (50) arranged in the housing (10) to extend over a front face of an end section of the rod-like projectile (40); and a detonator (20) which is arranged in the housing (10) to face another end section of the rod-like projectile (40) and is configured, to generate pressure to fire the rod-like projectile (40) in the direction of the conductor section (50), wherein the conductor section (50) comprises a first circuit board (53c) arranged at the front of one end section of the rod-like projectile (40), characterized by , that the conductor section (50) further comprises a second printed circuit board (53d) and a third printed circuit board (53e) which are coupled at a corresponding edge section of the second printed circuit board (53d) and the third printed circuit board (53e) to the respective opposite edge sections of the first printed circuit board (53c), the first circuit board (53c) has a groove (56) or a web section (57) which or which is formed in or on a side face of each of the opposite edge segments, Each of the second printed circuit board (53d) and the third printed circuit board (53e) comprises a corresponding web section (57) or a corresponding groove (56) which or which is formed on or in a side face of a corresponding edge section of the second printed circuit board (53d) and the third printed circuit board (53e), the first printed circuit board (53c) and each of the second printed circuit board (53d) and the third printed circuit board (53e) are arranged to butt against each other at the edge sections of the first printed circuit board (53c) and a corresponding section of the second printed circuit board (53d) and the third printed circuit board (53e) in a manner that is flush with each other, and each of the slots (56) or each of the web sections (57) of the first printed circuit board (53c) and the bridge section (57) or the groove (56) of a corresponding second printed circuit board (53d) and third printed circuit board (53e) are pressed into each other. [7] Electrical circuit breaker device (1), comprising: a housing (10) made of synthetic resin; a rod-like projectile (40) made of synthetic resin and arranged in the housing (10); a conductor section (50) arranged in the housing (10) to extend over a front face of an end section of the rod-like projectile (40); and a detonator (20) which is arranged in the housing (10) to face another end section of the rod-like projectile (40) and is configured, to generate pressure to fire the rod-like projectile (40) in the direction of the conductor section (50), wherein the conductor section (50) comprises a first circuit board (53c) arranged at the front of one end section of the rod-like projectile (40), characterized by , that the conductor section (50) further comprises a second printed circuit board (53d) and a third printed circuit board (53e) which are coupled at a corresponding edge section of the second printed circuit board (53d) and the third printed circuit board (53e) to the respective opposite edge sections of the first printed circuit board (53c), the first printed circuit board (53c) includes an upper folded-back section (58a, 58b) on each of the opposite edge sections, each of the second printed circuit board (53d) and the third printed circuit board (53e) comprises a lower folded-back section (59a, 59b) on a corresponding edge section of the second printed circuit board (53d) and the third printed circuit board (53e), and the lower folded back section (59a, 59b) of each of the second circuit board (53d) and the third circuit board (53e) is snapped and hammered into place with a corresponding upper folded-back sections (58a, 58b) of the opposite edge sections of the first circuit board (53c).

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