Trigger switch

Abstract

To prevent an arc, which is generated in a main switch, from flying to a connector or a pattern of a printed wiring board.SOLUTION: A connector (a connection section 531 and a connector body 532) is inserted and mounted in a printed wiring board 51, positioned in an end of the printed wiring board 51 at a -Z side and turned in a -Z direction. The connector is exposed outside of a cover 13 via a connector exposure hole and positioned in a substantially vertical direction with respect to a cover sidewall in a view from a main switch (a stationary contact piece 413 and a movable contact piece 414). A cover partition wall 33 is positioned in a closed space 19 and interposed between the main switch and the printed wiring board 51.SELECTED DRAWING: Figure 24

Description

【Technical Field】 【0001】 The present invention relates to a trigger switch. 【Background Art】 【0002】 Patent Document 1 describes a switch for a power tool having a connector disposed on a sliding resistance substrate. 【Prior Art Document】 【Patent Document】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2005-153029 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 A trigger switch generally has a main switch for power having a fixed contact piece provided below an operation part and a movable contact piece that rotates by operating the operation part, and further has a terminal provided below the main switch for connecting a power wiring from below to the main switch. The switch for a power tool of Patent Document 1 is configured to connect a signal wiring to a connector from above. For this reason, it is necessary to connect the wiring from the opposite side to the power wiring, and it takes time to assemble the power tool, such as generating extra routing of the wiring. On the other hand, a large current may flow through the main switch, and an arc may occur when the switch is turned off. In order to be able to connect a signal wiring to the connector from below, it is necessary to dispose the connector at a position relatively close to the main switch, and there is a possibility that an arc generated at the main switch may jump to the connector. An object of this invention is to solve such problems, for example. 【Means for Solving the Problems】 【0005】 The trigger switch has a case side wall and a case peripheral wall extending from the periphery of the case side wall in a direction substantially perpendicular to the case side wall, defining a main switch housing space enclosed by the case side wall and the case peripheral wall, and a terminal housing space adjacent to the main switch housing space in a predetermined direction substantially parallel to the case side wall, and has a cover side wall, a cover peripheral wall extending from the periphery of the cover side wall in a direction substantially perpendicular to the cover side wall, and a cover partition wall extending inward from the portion of the cover peripheral wall on the side in the predetermined direction in a direction substantially parallel to the cover side wall, defining a printed circuit board housing space enclosed by the cover side wall and the cover peripheral wall, and the case The cover is fixed in place so that the cover sidewall is positioned substantially parallel to the case sidewall, forming a closed space including the main switch housing space and the printed circuit board housing space. The cover includes a main switch housed in the main switch housing space, terminals which are at least partially housed in the terminal housing space and are electrically connected to the main switch, and to which external wiring can be connected from the predetermined direction, a printed circuit board which is housed in the printed circuit board housing space and is positioned adjacent to the case sidewall and substantially parallel to the case sidewall, and a connector which is inserted and mounted on the printed circuit board, is located at the end of the printed circuit board on the side of the predetermined direction, and faces the predetermined direction. The cover has a connector exposure hole extending from the cover sidewall to the portion of the cover peripheral wall on the side of the predetermined direction. The connector is exposed to the outside of the cover through the connector exposure hole and is positioned substantially perpendicular to the cover sidewall when viewed from the main switch. The printed circuit board covers and closes the connector exposure hole from the inside. The cover partition is located within the enclosed space and is interposed between the main switch and the printed circuit board. The cover peripheral wall may have a thin portion around the connector exposure hole that engages with the printed circuit board, and the inner surface of the portion adjacent to that portion may have a chamfer. [Effects of the Invention] 【0006】 According to the trigger switch, since the cover partition is interposed between the main switch and the printed circuit board within a closed space, it is possible to prevent arcs generated at the main switch from flying to the printed circuit board (especially the connectors inserted and mounted thereon). If there is a chamfer on the inside of the part of the cover's peripheral wall adjacent to the part that mates with the printed circuit board, the workability of the process of assembling the printed circuit board with the connector inserted into it into the cover will be improved. [Brief explanation of the drawing] 【0007】 [Figure 1] A plan view showing an example of a trigger switch. [Figure 2] A front view showing an example of a trigger switch. [Figure 3] A bottom view showing an example of a trigger switch. [Figure 4] A right-side view showing an example of a trigger switch. [Figure 5] A rear view showing an example of a trigger switch. [Figure 6] A left side view showing an example of a trigger switch. [Figure 7] A front view showing an example of a trigger switch with the cover removed. [Figure 8] A rear view showing an example of a cover with a printed circuit board. [Figure 9] A plan view showing an example of a case. [Figure 10] A front view showing an example of a case. [Figure 11] A bottom view showing an example of a case. [Figure 12] A right-side view showing an example of the case. [Figure 13] A rear view showing an example of a case. [Figure 14] A left side view showing an example of the case. [Figure 15] A plan view showing an example of a cover. [Figure 16] A front view showing an example of a cover. [Figure 17] A bottom view showing an example of a cover. [Figure 18] Right side view showing an example of a cover. [Figure 19] Rear view showing an example of a cover. [Figure 20] Left side view showing an example of a cover. [Figure 21] Enlarged sectional view taken along line B - B showing an example of a cover. [Figure 22] Partially enlarged sectional view taken along line A - A showing an example of a cover. [Figure 23] Enlarged sectional view taken along line B - B showing an example of a trigger switch. [Figure 24] Partially enlarged sectional view taken along line A - A showing an example of a trigger switch. [Figure 25] Partially enlarged sectional view taken along line A - A showing an example of the process of attaching a printed wiring board to a cover. 【Mode for Carrying Out the Invention】 【0008】 The trigger switch 10 will be described with reference to FIGS. 1 to 8. The trigger switch 10 has, for example, a plunger 11, a case 12, a cover 13, a main circuit 14, a signal circuit 15, a biasing member 16, a push rod 17, and a sealing material 18. 【0009】 The case 12 and the cover 13 are fixed to each other, thereby defining an accommodation space for accommodating the main circuit 14 and the signal circuit 15 inside. The plunger 11 is arranged to be movable in the ±Y direction with respect to the case 12 and the cover 13, and moves in the +Y direction when the user pulls a trigger (not shown). The plunger 11 is arranged inside the accommodation space defined by the case 12 and the cover 13, but the portion connected to the trigger protrudes outward in the -Y direction from the accommodation space. The biasing member 16 is, for example, a coil spring, is arranged in the +Y direction of the plunger 11 inside the accommodation space, and biases the plunger 11 in the -Y direction. Thereby, when the user releases the trigger, the plunger 11 moves in the -Y direction. The push rod 17 is positioned on the -Z side of the plunger 11 and moves along with the plunger 11 in the ±Y direction as the plunger 11 moves. The push rod 17 is biased toward the -Z direction relative to the plunger 11 by a spring (not shown) or the like. 【0010】 The main circuit 14 is a circuit for transmitting power. The main circuit 14 has, for example, a main switch 41 and three terminals 42 to 44. The main switch 41 has, for example, two fixed contacts 412 and 413 and a movable contact 414. The fixed contacts 412 and 413 are fixed inside the case 12. The movable contact 414 is rotatably fixed inside the case 12. The movable contact 414 is positioned close to the -Z side of the plunger 11 and rotates by contacting the push rod 17 as the plunger 11 moves. External wiring is connected to terminals 42-44 from the -Z side. Terminals 42-44 are fixed to case 12. Terminals 42-44 are located adjacent to the -Z side of the main switch 41. Terminal 42 is electrically connected to fixed contact 412. Terminal 43 is electrically connected to fixed contact 413. Terminal 44 is electrically connected to movable contact 414 and also functions as a pivot point for the rotation of movable contact 414. When the user releases the trigger and the plunger 11 is in the -Y position, the movable contact 414 makes contact with the fixed contact 412 and moves away from the fixed contact 413. As a result, electrical conductivity is established between terminal 42 and terminal 44, and insulation is established between terminal 43 and terminal 44. When the user pulls the trigger and the plunger 11 is in the +Y position, the movable contact 414 moves away from the fixed contact 412 and makes contact with the fixed contact 413. As a result, terminals 42 and 44 are insulated, and terminals 43 and 44 become electrically conductive. 【0011】 The signal circuit 15 is a circuit for detecting the position of the trigger. The signal circuit 15 includes, for example, a printed circuit board 51, a sliding contact piece 52, and a connector 53. The printed circuit board 51 is fixed inside the cover 13, approximately perpendicular to the ±X direction. The printed circuit board 51 is positioned close to the +X side of the plunger 11, and patterns 511 and 512 are provided on its -X side. The sliding contact piece 52 is fixed to the plunger 11 and moves with the plunger 11 in the ±Y direction. The sliding contact piece 52 is positioned on the +X side of the plunger 11 and contacts patterns 511 and 512 to make electrical connections. External wiring is connected to connector 53 from the -Z side. This is the same orientation as when external wiring is connected to terminals 42-44. Since all wiring connected to the trigger switch 10 can be connected from the same side, wiring is made easier. The connector 53 is fixed to the printed circuit board 51. The connector 53 is located at the -Z end of the printed circuit board 51. The connector 53 has a connecting portion 531 and a connector body 532 (see Figures 23 and 24). The connector body 532 is located on the +X side of the printed circuit board 51. The connecting portion 531 is inserted into a through hole (via) provided in the printed circuit board 51 and is electrically connected to patterns 511 and 512 by soldering or the like. For this reason, the connecting portion 531 protrudes through the printed circuit board 51 to the -X side. 【0012】 As the plunger 11 moves, the position where the sliding contact piece 52 contacts patterns 511 and 512 changes or ceases to contact them, causing a change in the resistance between the terminals provided in the connector 53. Therefore, the position of the plunger 11 can be detected by measuring this resistance. 【0013】 The cover 13 is provided with a connector exposure hole 36 (see Figure 16) for exposing the connector 53 to the outside. The sealing material 18 is, for example, resin, and seals the connector exposure hole 36. This prevents dust and moisture from entering the internal space defined by the case 12 and cover 13 from the outside. 【0014】 Refer to Figures 9-14 to explain Case 12 in detail. Case 12 defines a main switch housing space 29 for housing the main switch 41 and terminal housing spaces 26-28 for housing terminals 42-44. Case 12 has, for example, a case side wall 21 and a case peripheral wall 22. The case side wall 21 is a roughly rectangular flat plate that is roughly perpendicular to the ±X direction. 【0015】 The case peripheral wall 22 is plate-shaped and extends in the +X direction from the periphery of the case side wall 21. The case peripheral wall 22 has, for example, a left side portion 221, an upper side portion 222, and a right side portion 223. The left side portion 221 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, and its -X side is connected to the -Y side of the case side wall 21. The upper surface portion 222 is a roughly rectangular flat plate that is roughly perpendicular to the ±Z directions, with the -X side connecting to the +Z side of the case side wall 21 and the -Y side connecting to the +Z side of the left surface portion 221. The right side portion 223 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, with the -X side connecting to the +Y side of the case side wall 21 and the +Z side connecting to the +Y side of the top surface portion 222. 【0016】 The main switch housing space 29 is enclosed by the case side wall 21 and the case peripheral wall 22, with an opening on the +X side. The terminal housing spaces 26-28 are adjacent to the -Z side of the main switch housing space 29, with openings on both the +X and -Z sides. 【0017】 Refer to Figures 15-22 for a detailed explanation of cover 13. The cover 13 defines a printed circuit board housing space 39 for housing the printed circuit board 51. The cover 13 has, for example, a cover side wall 31, a cover peripheral wall 32, a cover partition wall 33, and a cover bottom wall 35. The cover sidewall 31 is a roughly rectangular plate shape that is roughly perpendicular to the ±X direction. The width (length in the ±Y direction) of the cover sidewall 31 is approximately the same as that of the case sidewall 21. 【0018】 The cover peripheral wall 32 is plate-shaped and extends in the -X direction from the periphery of the cover side wall 31. The cover peripheral wall 32 has, for example, a left surface portion 321, an upper surface portion 322, a right surface portion 323, and a lower surface portion 324. The left side portion 321 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, with the +X side connected to the -Y side of the cover side wall 31. The upper surface portion 322 is a roughly rectangular flat plate that is roughly perpendicular to the ±Z direction, with the +X side connecting to the +Z side of the cover side wall 31 and the -Y side connecting to the +Z side of the left surface portion 321. The right side portion 323 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, and its +X side is connected to the +Y side of the cover side wall 31. The lower portion 324 is a bent plate shape, connected to the -Z end of the cover side wall 31 on the +X side, to the -Z side of the left portion 321 on the -Y side, and to the -Z end of the right portion 323 on the +Y side. The lower portion 324 has, for example, a left horizontal portion 325, a left vertical portion 326, a middle horizontal portion 327, a right vertical portion 328, and a right horizontal portion 329. The left side portion 325 is a roughly rectangular flat plate that is roughly perpendicular to the ±Z direction, with the +X side connected to the cover side wall 31 and the -Y side connected to the -Z side of the left surface portion 321. The left vertical section 326 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, with the +X side connecting to the -Z end of the cover side wall 31 and the +Z side connecting to the +Y side of the left horizontal section 325. The central horizontal section 327 is a roughly rectangular flat plate that is roughly perpendicular to the ±Z direction, with the +X side connecting to the -Z end of the cover side wall 31 and the -Y side connecting to the -Z side of the left vertical section 326. The right vertical section 328 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, with the +X side connecting to the -Z end of the cover side wall 31 and the -Z side connecting to the +Y side of the middle horizontal section 327. The right side section 329 is a roughly rectangular flat plate that is roughly perpendicular to the ±Z direction, with the +X side connecting to the -Z end of the cover side wall 31, the -Y side connecting to the +Z side of the right vertical section 328, and the +Y side connecting to the -Z side of the right face section 323. 【0019】 The cover partition wall 33 is a curved plate-like structure extending in the +Z direction from the central lateral portion 327 of the cover peripheral wall 32. The cover partition wall 33 has, for example, a left lateral portion 335, a left vertical portion 336, a central lateral portion 337, a right vertical portion 338, and a right lateral portion 339. The central horizontal section 337 is a roughly rectangular flat plate that is roughly perpendicular to the ±X direction, and its -Z side is connected to the midpoint of the -X side of the central horizontal section 327. The +X side of the +Z end of the central horizontal section 337 is chamfered (see Figure 21). The left vertical section 336 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y direction, with the -Z side connecting to the +Z side surface of the middle horizontal section 327 and the -X side connecting to the -Y side surface of the middle horizontal section 337. The left horizontal section 335 is a roughly rectangular flat plate that is roughly perpendicular to the ±X directions, with its -Z side connecting to the +Z side surface of the middle horizontal section 327, and its +Y side connecting to the +X side surface of the left vertical section 336. The thickness of the left horizontal section 335 is thicker on the -Z side and becomes thinner towards the +Z direction. The right vertical section 338 is a roughly rectangular flat plate that is roughly perpendicular to the ±Y directions, with the -Z side connecting to the +Z side surface of the middle horizontal section 327 and the -X side connecting to the +Y side surface of the middle horizontal section 337. The right horizontal section 339 is a roughly rectangular flat plate that is roughly perpendicular to the ±X directions, with its -Z side connecting to the +Z side surface of the middle horizontal section 327, and its -Y side connecting to the +X side surface of the right vertical section 338. The thickness of the right horizontal section 339 is thicker on the -Z side and becomes thinner towards the +Z direction. The -Y side of the left horizontal section 335 is separated from the left vertical section 326, creating a gap between the left horizontal section 335 and the left vertical section 326. Similarly, the +Y side of the right horizontal section 339 is separated from the right vertical section 328, creating a gap between the right horizontal section 339 and the right vertical section 328. These gaps facilitate the die-cutting of the cover 13. 【0020】 The lower wall 35 of the cover is a roughly rectangular plate shape that is roughly perpendicular to the ±X direction and is connected to the middle part of the lower surface 324 on the +Z side. 【0021】 The connector exposure hole 36 is provided extending from the cover side wall 31 to the cover peripheral wall 32 and has a side portion 361 and a peripheral portion 362. The side portion 361 is substantially rectangular in shape, with a width (length in the ±Y direction) approximately equal to that of the central horizontal portion 327, and is provided on the cover side wall 31, positioned approximately in the center of the cover side wall 31 in the ±Y direction and in contact with the -Z side end of the cover side wall 31 in the ±Z direction. The peripheral portion 362 is substantially rectangular in shape, with a width (length in the ±Y direction) smaller than that of the central horizontal portion 327, and is provided on the central horizontal portion 327, positioned approximately in the center of the central horizontal portion 327 in the ±Y direction and in contact with the +X side end of the central horizontal portion 327 in the ±X direction, and is continuous with the side portion 361. The portion of the central horizontal section 327 that contacts the -X side of the peripheral portion 362 of the connector exposure hole 36 is thinner than the other portions. The length of this portion is approximately equal to the thickness of the printed circuit board 51. This portion mates with the -Z side end of the printed circuit board 51. Furthermore, the +Z side corner of the +X side tip of the subsequent thicker portion is chamfered. 【0022】 The printed circuit board housing space 39 is surrounded by the cover side wall 31, the cover peripheral wall 32, and the cover partition wall 33, with an opening on the -X side. 【0023】 The trigger switch 10 will be further described with reference to Figures 23 and 24. When the cover 13 is assembled and fixed to the case 12, the main switch housing space 29 and the printed circuit board housing space 39 face each other and communicate, forming a single enclosed space 19. 【0024】 As described above, the main switch 41 is positioned adjacent to the -Z side of the plunger 11. The connector 53 is positioned at the -Z end of the printed circuit board 51, which is located close to the +X side of the plunger 11, so that patterns 511 and 512 contact the sliding contact piece 52 fixed to the +X side of the plunger 11. Therefore, the connector 53 is located approximately in the +X direction when viewed from the main switch 41. As described above, the connection portion 531 protrudes to the -X side of the printed circuit board 51, so it is located very close to the main switch 41. 【0025】 As described above, since the main circuit 14 is a circuit for transmitting power, when the movable contact 414 separates from the fixed contact 412 or 413 due to the movement of the plunger 11, there is a possibility that an arc may be generated between the movable contact 414 and the fixed contact 412 or 413. However, since the lower surface portion 324 of the cover peripheral wall 32 and the cover partition wall 33 are positioned to cover the connection portion 531, the connection portion 531 and patterns 511 and 512 are protected from arcs generated by the main switch 41. 【0026】 Referring to Figure 25, the process of assembling the printed circuit board 51 to the cover 13 will be described. The connector 53 is first fixed to the printed circuit board 51 by soldering or other means, and then inserted diagonally into the cover 13 from the -X side. Then, the connector body 532 is exposed on the +X side of the cover 13 through the connector exposure hole 36, and the printed circuit board 51 is rotated around an axis parallel to the ±Y direction so that it is perpendicular to the ±X axis. As a result, the -Z side end of the printed circuit board 51 fits into the thin part of the middle horizontal section 327. Since the adjacent part is chamfered, the printed circuit board 51 can be easily rotated. Subsequently, the connector exposure hole 36 is sealed with the sealing material 18. This prevents dust and moisture from entering the enclosed space 19 through the connector exposure hole 36. 【0027】 The embodiments described above are examples intended to facilitate understanding of the present invention. The present invention is not limited thereto and includes various modifications, changes, additions, or deletions without departing from the scope defined by the appended claims. This will be readily apparent to those skilled in the art from the above description. 【0028】 For example, instead of directly mounting the connector 53 to the printed circuit board 51, lead wires extending from the connector 53 may be connected to the printed circuit board 51. [Explanation of symbols] 【0029】 10 Trigger switch, 11 Plunger, 12 Case, 21 Case side wall, 22 Case peripheral wall, 221, 321 Left side, 222, 322 Top, 223, 323 Right side, 26-28 Terminal housing space, 29 Main switch housing space, 13 Cover, 31 Cover side wall, 32 Cover peripheral wall, 324 Bottom, 325, 335 Left side, 326, 336 Left vertical, 327, 337 Middle horizontal, 328, 338 Right vertical, 329, 339 Right side, 33 Cover partition, 35 Cover bottom wall, 36 Connector exposure hole, 361 Side, 362 Perimeter, 39 Printed circuit board housing space, 14 Main circuit, 41 Main switch, 412, 413 Fixing contacts, 414 Movable contact piece, 42-44 terminals, 15 signal circuit, 51 printed circuit board, 511, 512 patterns, 52 sliding contact piece, 53 connector, 531 connection part, 532 connector body, 16 biasing member, 17 push rod, 18 sealing material, 19 enclosed space.

Claims

[Claim 1] A case having a case side wall and a case peripheral wall extending from the periphery of the case side wall in a direction substantially perpendicular to the case side wall, defining a main switch housing space enclosed by the case side wall and the case peripheral wall, and a terminal housing space adjacent to the main switch housing space in a predetermined direction substantially parallel to the case side wall, A cover comprising a cover side wall, a cover peripheral wall extending from the periphery of the cover side wall in a direction substantially perpendicular to the cover side wall, and a cover partition wall extending inward from a portion of the cover peripheral wall on the side in the predetermined direction in a direction substantially parallel to the cover side wall, defining a printed circuit board housing space enclosed by the cover side wall and the cover peripheral wall, fixed to the case, thereby arranging the cover side wall substantially parallel to the case side wall, and forming a closed space including the main switch housing space and the printed circuit board housing space, The main switch housed in the aforementioned main switch housing space, A terminal, at least a portion of which is housed in the terminal housing space, electrically connected to the main switch, and capable of receiving external wiring from the predetermined direction, A printed circuit board housed in the aforementioned printed circuit board housing space, positioned adjacent to the case side wall and substantially parallel to the case side wall, The connector connected to the aforementioned printed circuit board and Equipped with, The cover has connector exposure holes extending from the side wall of the cover to the portion of the cover peripheral wall on the side in the predetermined direction, The connector is exposed to the outside of the cover through the connector exposure hole, and the printed circuit board covers and seals the connector exposure hole from the inside. The cover partition is located within the enclosed space and is interposed between the main switch and the printed circuit board. Trigger switch. [Claim 2] The connector is inserted and mounted on the printed circuit board, located at the end of the printed circuit board on the side in the predetermined direction, facing the predetermined direction, and positioned substantially perpendicular to the cover side wall when viewed from the main switch. The trigger switch according to claim 1. [Claim 3] The cover peripheral wall has a thin portion around the connector exposure hole that fits with the printed circuit board, and the portion adjacent to that portion has a chamfer on the inside. A trigger switch according to claim 1 or 2.

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