JP2011222294A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch which maintains a high level of insulation and obtains good insulation and voltage resistance characteristics when a fixed contact point is separated from a movable contact point.SOLUTION: The switch includes: a case 10 having at least a bottom surface 17 and right/left side surfaces 19 to form a contact housing portion 11; a fixed contact 45 disposed in the contact housing 11; and a movable contact body 70 disposed in the contact housing portion 11 and having a movable contact 71 that contacts with or separates from the fixed contact 45. A scatter-suppressing member 250 is attached to the movable contact 71 so that the scatter-suppressing member 250 extends from the perimeter of the movable contact 71 and reduces the area where scattered powder, which is generated and scattered by arc discharge between the movable contact 71 and the fixed contact 45, falls on the side surfaces 19 of the case 10 around the movable contact 71.

Description

  The present invention relates to a switch, and more particularly to a switch suitable for use in turning on and off a power supply.

  Conventionally, as shown in FIG. 22 of Patent Document 1, for example, a power switch (a switch used to turn on / off a power supply) is provided with a fixed contact body (4) and a movable contact body support (5) on the bottom surface of a case (2). The movable contact body (3) is swingably installed on the upper side (523) of the upright portion (521) (see FIG. 18 of Patent Document 1) of the attachment and movable contact body support body (5), and further the movable contact point The operation knob (1) is swingably installed on the body (3), and the operation section (12) protruding from the lower surface of the operation knob (1) by swinging the operation knob (1) (Patent Document) 1 (see FIG. 2 of FIG. 1) is moved to the left and right, and the movable contact body (3) whose one end is locked to the operation portion (12) is swung to fix the fixed contact (41) of the fixed contact body (4). And the movable contact (31) of the movable contact body (3) are turned on and off.

  On the other hand, in the case of the power switch described above, the movable contact (31) located above the fixed contact (41) attached to the bottom surface of the case (2) is moved down so that both the contacts (41) and (31) are applied. Between the two contacts (41) and (31) immediately before the contact and immediately after the movable contact (31) in contact with the fixed contact (41) is raised and the contacts (41) and (31) are separated. Arc discharge may occur in the case. This arc discharge occurs when the potential difference between the contacts (41) and (31) is large or when the current value of the circuit is large.

  On the other hand, when arc discharge occurs, the heat generated by the arc discharge evaporates a part of the metal constituting both contacts (41) and (31), and the evaporated metal scatters around. At the same time, both contacts (41), (31) wear out.

  The evaporated metal scattered to the periphery adheres to the inner surface of the case (2) as scattered powder (including metal oxide powder and carbide powder in addition to metal powder). Of the inner surface of the case (2), the portion of the inner surface in the vicinity of the fixed contact (41) is the place where the scattered powder adheres most, and the amount of scattered powder decreases as the distance from the place increases.

JP 2004-303727 A

  When the power switch is reduced in size and thickness so that the spatial distance between the both contacts (41), (31) and the left and right sides of the case (2) is shortened, the scattered powder on the left and right sides of the case (2) is reduced. Even if the two contacts (41) and (31) are sufficiently separated from each other by the influence of adhesion (that is, both the contacts (41) and 31) are turned off (disengaged state), both the contacts (41) of the switch , (31), the insulation characteristics and withstand voltage characteristics deteriorated.

  The mechanism of the deterioration of the insulation characteristics and withstand voltage characteristics is as follows. When both the contacts (41) and (31) are turned on and off electrically and mechanically, as described above, the scattered powder having conductivity is scattered in the case (2) by arc discharge. In particular, when the side surface of the case (2) and the contacts (41), (31) approach each other, the scattered powder adhering to the side surface of the case (2) becomes a conductive path, and the movable contact (31) is mechanically in the off position. However, the insulation property between the movable contact (31) and the fixed contact (41) is determined by the conductive path formed on the side surface of the case (2) between the both contacts (41) and (31). 31) Insulation characteristics and withstand voltage characteristics are degraded. When the amount of scattered powder adhering to the side surface of the case (2) further increases, the contact between the two contacts (41) and (31) is mechanically turned off while being mechanically turned off, and the switch on / off function is lost. Will occur. From the viewpoint of safety, even if the movable contact (31) is located at the mechanically off position, a tracking phenomenon occurs in which a leakage current flows on the side surface of the case (2), thereby causing the synthetic resin of the case (2). Insulators may carbonize and eventually cause a serious accident that ignites.

  In order to solve the above-mentioned problem, the spatial distance between the both contacts (41), (31) and the left and right side surfaces of the case (2) may be increased. However, this makes it impossible to reduce the size and thickness of the switch.

  The present invention has been made in view of the above points, and its purpose is to maintain a high insulation state in a state in which the fixed contact and the movable contact constituting the switch are separated from each other, and to have good insulation characteristics and withstand voltage characteristics. It is to provide an obtained switch.

  The invention according to claim 1 of the present application is a case that has at least a bottom surface and a side surface to form a contact housing portion, a fixed contact that is installed in the contact housing portion of the case, and a housing that is installed in the contact housing portion of the case. And a movable contact body having a movable contact that contacts and separates from the fixed contact, the scattered powder generated by an arc that protrudes from the periphery of the movable contact and is generated between the movable contact and the fixed contact. The switch is characterized in that a scattering suppression member for suppressing a range of adhesion to the side surface of the case around the movable contact is attached.

  The invention according to claim 2 of the present application is the switch according to claim 1, wherein the movable contact is a mass and is attached to a surface of the movable contact body facing the fixed contact, and the scattering The suppression member is in a switch characterized in that it is configured to project from the outer periphery of the movable contact toward the side surface of the contact housing portion of the case.

  The invention according to claim 3 is the switch according to claim 2, wherein the scattering suppression member is attached between the massive movable contact and the movable contact body, or the movable contact body is movable. The switch is attached to the opposite side to which the contact is attached.

  A fourth aspect of the present invention is the switch according to the third aspect, wherein the scattering suppressing member is formed of a flexible thin plate.

  The invention according to claim 5 of the present application is the switch according to claim 4, wherein the case is a box type having a contact housing portion therein, and a movable contact body support is installed in the contact housing portion, The movable contact body is provided in a switch characterized in that it is swingably installed with respect to the movable contact body support.

  The invention according to claim 6 of the present application is the switch according to claim 1, wherein the movable contact is a lump and is attached to a surface of the movable contact body facing the fixed contact, and the scattering The suppressing member is a switch characterized by covering at least a part of the outer periphery of the movable contact by projecting from the outer periphery of the movable contact and directing a tip portion thereof toward the fixed contact.

  The invention according to claim 7 of the present application is the switch according to claim 6, wherein the scattering suppressing member is attached between the movable contact and the movable contact body, or the movable contact of the movable contact body is connected. The switch is mounted on the opposite side of the mounted surface.

  The invention according to claim 8 of the present application is the switch according to claim 7, wherein the case has a box shape having a contact housing portion therein, and a movable contact body support is installed in the contact housing portion. The movable contact body is provided in a switch characterized in that it is swingably installed with respect to the movable contact body support.

  According to the first aspect of the present invention, the range in which the scattered powder generated by the arc discharge generated between the movable contact and the fixed contact is limited by the scattering suppression member, and the side surface of the case (at least of the left and right side surfaces) is limited. The adhesion range of the scattered powder to any one side surface) is limited. As a conductive layer through which scattered powder adhering to the side surface of the case placed close to these contacts conducts electricity when the movable contact and the fixed contact are separated from each other (mechanical contact off position). Stops functioning. As a result, in a state where the two contacts are separated from each other, a high insulation state can be maintained and good switch insulation characteristics and withstand voltage characteristics can be obtained. As a result, the spatial distance between the contact points and the side surface of the case can be shortened, so that the switch can be reduced in size and thickness.

  According to the second aspect of the present invention, since the scattering suppressing member protrudes toward the side surface of the contact housing portion of the case, it faces the back side of the movable contact, that is, the opposite side facing the fixed contact of the movable contact. It is possible to suppress the scattering of scattered powder. This effectively suppresses scattered powder from adhering to the side surface of the contact housing portion of the case approaching the moving locus of the movable contact. As a result, in a state where the two contacts are separated from each other, a high insulation state can be maintained and good switch insulation characteristics and withstand voltage characteristics can be obtained.

  According to invention of Claim 3, a scattering suppression member can be easily attached, without inhibiting size reduction of a switch. Note that if the scattering suppression member is installed between the movable contact and the movable contact body, the scattering suppression member can be installed closer to the fixed contact, so that the scattered powder adheres more effectively to the side surface of the contact storage part of the case. Can be suppressed.

  According to invention of Claim 4, even if the front end side of a scattering suppression member touches the side surface of the contact accommodating part of a case by shakiness etc. of a movable contact body, a scattering suppression member has flexibility. Therefore, the movement of the movable contact body is not hindered.

  According to the fifth aspect of the present invention, the present invention can be applied to a seesaw type switch in which a movable contact body is swingably installed in a case.

  According to the sixth aspect of the present invention, it is possible to suppress the scattered powder from being scattered not only in the back surface direction of the movable contact but also in the direction covered by the scattering suppression member on the outer periphery of the movable contact. This more effectively suppresses the scattered powder from adhering to the side surface of the contact storage part of the case. As a result, in a state where the two contacts are separated from each other, a high insulation state can be maintained and good switch insulation characteristics and withstand voltage characteristics can be obtained.

  According to the seventh aspect of the present invention, the scattering suppression member can be easily attached without hindering the downsizing of the switch.

  According to the invention described in claim 8, the present invention can be applied to a seesaw type switch in which a movable contact body is swingably installed in a case.

It is a perspective view of switch 1-1. It is an AA schematic sectional drawing of FIG. It is the disassembled perspective view of the upper part which looked at the switch 1-1 from the upper side. It is a disassembled perspective view of the lower part which looked at the switch 1-1 from the upper side. It is the disassembled perspective view of the upper part which looked at the switch 1-1 from the lower side. It is a disassembled perspective view of the lower part which looked at the switch 1-1 from the lower side. 3 is an enlarged perspective view of a movable contact body 70. FIG. FIG. 3 is an enlarged schematic cross-sectional view of a main part in the vicinity of a fixed contact 45 and a movable contact 71 when a switch is turned on. It is a figure which shows main area | regions D and D 'by which adhesion of the scattering powder to case 10 is suppressed. It is a principal part expansion schematic sectional drawing which shows the example which changed the installation position of the scattering suppression member 250. FIG. It is a schematic sectional drawing of switch 1-2. It is an expansion perspective view of the movable contact body 70 which attached the scattering suppression member 250-2. FIG. 3 is an enlarged schematic cross-sectional view of a main part in the vicinity of a fixed contact 45 and a movable contact 71 when a switch is turned on. It is an expansion perspective view of the movable contact body 70 which attached the scattering suppression member 250-3. It is an expansion perspective view of the movable contact body 70 which attached the scattering suppression member 250-4. It is an expansion perspective view of the movable contact body 70 which attached the scattering suppression member 250-5. FIG. 6 is an enlarged schematic cross-sectional view of a main part in the vicinity of a fixed contact 45 and a movable contact 71 when a switch 1-6 is turned on. It is a schematic sectional drawing of switch 1-7.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a perspective view of a switch 1-1 according to the first embodiment of the present invention, FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is an exploded perspective view of an upper part when the switch 1-1 is viewed from above. 4 is an exploded perspective view of the lower part when the switch 1-1 is viewed from the upper side, FIG. 5 is an exploded perspective view of the upper part when the switch 1-1 is viewed from the lower side, and FIG. It is a disassembled perspective view of the lower part seen from the lower side. As shown in these drawings, the switch 1-1 includes a case 10 in which two sets of fixed contact bodies 40 and a movable contact body support body 50, two sets of movable contact bodies 70, and two sets of short-circuit pieces 200 are housed, A cover 80 covering the upper opening of the case 10, an outer case 100 installed from the upper part of the cover 80 to the upper part of the case 10, and inserted into the outer case 100 from the upper side so as to be swingably attached to the outer case 100. An operation knob 150 is provided. In the following description, “up” refers to the direction in which the operation knob 150 is viewed from the case 10, and “down” refers to the opposite direction.

  The case 10 is formed by integrally molding a synthetic resin into a substantially rectangular box shape whose upper surface is open. As the synthetic resin constituting the case 10, an insulating material such as a melamine resin excellent in arc resistance and tracking resistance and a thermosetting resin such as unsaturated polyester is used. A concave contact housing portion 11 having an open upper surface is formed inside the case 10, and a dividing wall 13 that divides the contact housing portion into two is formed at the center thereof. Two (four in total) slit-like terminal insertion holes 15 (only two on the front side are shown in FIG. 6) are provided on the bottom surface 17 in each contact accommodating portion 11.

  The fixed contact body 40 bends a bent portion of a substantially L-shaped metal plate at a substantially right angle, and fixes one portion (horizontal portion) of the fixed contact portion 41 and the other portion (vertical direction). The portion 43 is a terminal 43. A fixed contact 45 having a truncated cone shape is attached to the fixed contact portion 41. The fixed contact 45 has a lump shape (in this embodiment, a substantially truncated cone shape, but may be other various shapes such as a hemispherical shape and a cylindrical shape), but may be a plate shape.

  The movable contact body support body 50 is formed by bending a bent portion of a substantially L-shaped metal plate at a substantially right angle, one portion (a portion facing in the horizontal direction) of the support body portion 51, and the other portion (vertical portion). The terminal 53 is a portion facing the direction. The support body 51 is further bent at one end thereof at a substantially right angle to form an upright portion 54.

  The short-circuit piece 200 is made of an elastic metal plate, and has a flat mounting base 201 that abuts on the support body 51 of the movable contact body support 50, and protrudes from one side of the mounting base 201 and is folded back by approximately 180 °. And an elastic contact portion 205 formed at the tip of the arm portion 203.

  FIG. 7 is an enlarged perspective view of the movable contact body 70. As shown in the figure, the movable contact body 70 is formed of a substantially strip-shaped and elongated metal plate, and has a substantially frustoconical shape on the lower surface near the one end of the movable contact body 70 (the surface facing the fixed contact 45). A contact 71 is attached. A locking portion 73 is formed in the approximate center of each of a pair of both side edges along the longitudinal direction of the movable contact body 70, which is notched in a concave shape. The movable contact 71 has a lump shape (in this embodiment, it has a substantially truncated cone shape, but may have various other shapes such as a hemispherical shape and a cylindrical shape). The movable contact 71 protrudes from the upper surface side of the movable contact body 70 through a small hole formed in the movable contact body 70 through a small projection-shaped mounting section 77 (see FIG. 2) projecting from the upper surface thereof, and caulks the attachment section 77. Thus, the movable contact body 70 is attached.

  A scattering suppression member 250 is attached between the movable contact 71 and the movable contact body 70 so as to protrude from the periphery of the movable contact 71. The scattering suppression member 250 is configured by a substantially rectangular thin plate having flexibility, and the material thereof is a synthetic resin film, a molded synthetic resin, a metal, or the like. In this embodiment, a synthetic resin film having a thickness of 0.2 mm is used. As the synthetic resin, for example, polyimide, polyethylene naphthalate or the like is used. The material may be a film containing inorganic glass fibers. The scattering suppressing member 250 is attached by being sandwiched between the massive movable contact 71 and the movable contact body 70. The left and right tip sides 251 (both sides along the longitudinal direction of the movable contact body 70) of the scattering suppressing member 250 are, for example, left and right side surfaces (movable) in the contact accommodating portion 11 of the case 10, as shown in FIG. Both sides facing the both sides along the longitudinal direction of the contact body 70. The same shall apply hereinafter.

  The cover 80 covers the upper portion of the case 10 and is made of a synthetic resin made of a thermosetting insulating material such as a melamine resin or an unsaturated polyester excellent in arc resistance and tracking resistance. An operating body insertion hole 83 is formed in the center of the cover 80.

  The outer case 100 is made of synthetic resin, and an operation knob storage portion 105 for storing a knob outer body 160 of the operation knob 150 described below is provided at the center thereof, and an opening 107 is formed on the bottom surface of the operation knob storage portion 105. ing. A pair of shaft support holes 109 are provided on the opposite left and right side surfaces of the center of the outer case 100.

  The operation knob 150 includes a knob outer body 160, a knob main body 170, and a resilient member 180. The knob outer body 160 is a molded product of synthetic resin (for example, ABS resin or polycarbonate resin), and the knob main body 170 is integrally attached in a recess provided on the lower surface.

  The knob main body 170 is a molded product of a substantially rectangular synthetic resin (for example, a thermoplastic flame-retardant polyamide resin), and is formed in a dimension that can be stored almost exactly in a recess on the lower surface of the knob outer body 160. . A projecting portion having a substantially quadrangular prism shape projects from substantially the center of the lower surface of the knob main body 170, and a pair of elastic member housing portions 175 are formed on the lower surface of the projecting portion. The resilient member housing portion 175 is a substantially rectangular recess for housing the resilient member 180 described below. The operation member 190 is configured by the elastic member housing portion 175 provided in the knob body 170 and the elastic member 180 described below. A shaft portion 177 (only one on the front side is shown in FIGS. 3 and 5) is formed at the center of a pair of outer peripheral side surfaces facing the shaft support hole 109 of the outer case 100 of the knob body 170.

  The elastic member 180 is made of a synthetic resin (for example, thermoplastic polyamide resin, PBT resin, thermosetting melamine resin, etc.) and a substantially flat elastic member 181 and an elastic spring 187 made of a coil spring. Yes. The front end surface (lower end surface) of the elastic body 181 is an elastic contact surface 183. On the upper side of the elastic body 181 is formed a spring accommodating portion 185 made of a notch (made of a groove) into which the elastic spring 187 is inserted. Since the bullet 181 is flat, it is suitable for reducing the thickness of the switch 1-1.

  Next, in order to assemble the switch 1-1, first, the mounting base 201 of the short-circuit piece 200 is placed on the support body 51 of the movable contact body support 50 and fixed. Next, the movable contact body support body 50 and the fixed contact body 40 each having a pair of short-circuit pieces 200 mounted therein are inserted into the contact storage portions 11 of the case 10, and the terminal 43 and the movable contact body of the fixed contact body 40 are inserted. The terminal 53 of the support body 50 is inserted into each terminal insertion hole 15 of the case 10, and the fixed contact body 40 and the movable contact body support body 50 are fixed to the bottom surface of the contact housing portion 11.

  Next, the movable contact body 70 is housed in each contact housing portion 11 of the case 10, and the portion provided with the locking portion 73 of the movable contact body 70 is placed on the upper side of the standing portion 54 of the movable contact body support 50. It is pivotally supported. Next, the cover 80 is placed on the case 10 to close the opening on the upper surface of the case 10.

  Next, the upper surface side of the knob main body 170 is housed and integrated in a recess on the lower surface of the knob exterior body 160. The elastic member 180 is stored in the elastic member storage portion 175 of the knob main body 170, and the operation knob 150 is further stored in the operation knob storage portion 105 of the outer case 100. At this time, the shaft portion 177 of the knob main body 170 is connected to the outer side. The operation knob 150 is pivotally supported with respect to the outer case 100 by being inserted into the shaft support hole 109 of the case 100.

  Then, the outer case 100 is covered so as to cover the cover 80, and the lower ends of both side walls of the outer case 100 are fixed to the case 10. At this time, the operation body 190 of the operation knob 150 passes through the operation body insertion hole 83, and the elastic contact surfaces 183 of the pair of elastic bodies 181 are in elastic contact with the upper surfaces of the movable contact bodies 70, respectively. This completes the assembly of the switch 1-1. The above assembling procedure is an example, and it goes without saying that the assembly may be performed using other various assembling procedures.

  As shown in FIG. 2, the switch 1-1 configured as described above has at least a bottom surface 17 and left and right side surfaces 19 to form a contact housing portion 11 therein, thereby forming a box-shaped case 10. A fixed contact 45 installed on the bottom surface 17 of the contact housing part 11 of the case 10, a movable contact body support 50 installed on the bottom surface 17 of the contact housing part 11 of the case 10, and the contact housing part 11 of the case 10. A movable contact body 70 that has a movable contact 71 that is installed inside and that is movable toward and away from the fixed contact 45, and that is swingably disposed with respect to the movable contact body support 50, and is movable so as to protrude from the periphery of the movable contact 71. The anti-scattering member 250 is attached to the back side of the contact 71. The movable contact 71 is in the form of a lump and is attached to the surface of the movable contact body 70 on the side facing the fixed contact 45. The scattering suppression member 250 is configured to project from the outer periphery of the movable contact 71 toward at least the left and right side surfaces 19 of the contact storage portion 11 of the case 10. Actually, the scattering suppression member 250 protrudes from the entire circumference (the left and right sides, the front side, and the rear side) of the movable contact 71. The scattering suppression member 250 is attached between the massive movable contact 71 and the movable contact body 70.

  FIG. 2 shows a state where the operation knob 150 is fully swung to one side and the switch is turned off to be stable. The state shown in the figure is a state in which the movable contact 71 rises and is farthest from the fixed contact 45, and the fixed contact body 40 and the movable contact body support 50, that is, the terminals 43 and 53 are turned off.

  Next, when the upper surface of the operation knob 150 lifted upward is pressed (in the direction of arrow B shown in FIG. 2), the elastic contact surface 183 of the elastic body 181 touches the upper surface of the movable contact body 70. The elastic spring 187 is pressed and shrunk until the elastic contact surface 183 reaches the upper part of the standing portion 54 of the movable contact body support 50 by starting to move (slide) toward the movable contact 71 side. Is pushed into the elastic member housing portion 175, and when the elastic surface 183 passes through the upper portion of the standing portion 54, the movable contact body 70 descends on the movable contact 71 side with the portion of the standing portion 54 as a swing axis. As shown in FIG. 9, the movable contact 71 abuts against the fixed contact 45 instantaneously as shown in FIG. , Between the fixed contact body 40 and the movable contact body support body 50, that is, both Between child 43 and 53 is turned on. At this time, the operation knob 150 swings to the other side and becomes stable. FIG. 8 is an enlarged schematic cross-sectional view of the main part in the vicinity of the fixed contact 45 and the movable contact 71 when the switch is turned on, and shows a cross-section of the CC section of FIG.

  Before and after the movable contact 71 is turned on to the fixed contact 45, the elastic contact portion 205 of the short-circuit piece 200 is elastically contacted to the movable contact body 70. Therefore, even when the switch 1-1 is turned on, the movable contact body 70 stands up. Even when bouncing on the upper side of the installation portion 54, the state where the movable contact body 70 and the movable contact body support body 50 are electrically connected reliably is maintained. Since the short-circuit piece 200 is positioned below the movable contact body 70 and elastically contacts the lower surface of the movable contact body 70, it is suitable for reducing the thickness of the switch 1-1.

  Next, when the upper surface of the operation knob 150 on the newly lifted side is pressed, the movable contact body 70 is lifted on the movable contact 71 side with the portion 54 of the standing portion 54 as the swing axis by the reverse operation to that described above. 2 to return to the original state shown in FIG. 2, and the terminals 43 and 53 are turned off.

  By the way, immediately before the movable contact 71 contacts the fixed contact 45 and immediately after the movable contact 71 contacting the fixed contact 45 rises and the both contacts 71, 45 are separated from each other, an arc discharge occurs between the contacts 71, 45. May occur. When arc discharge occurs, the heat generated by the arc discharge evaporates a part of the metal constituting both contacts 71 and 45, and the evaporated metal scatters radially around.

  However, in the case of this embodiment, since the scattering suppressing member 250 projects toward the left and right side surfaces 19 of the contact accommodating portion 11 of the case 10, it faces the back side of the movable contact 71, that is, the fixed contact 45 of the movable contact 71. It is possible to prevent the scattered powder from scattering toward the opposite side. As a result, the adhesion of scattered powder to the left and right side regions (region D shown in FIG. 9) of the contact accommodating portion 11 approaching the movement locus of the movable contact 71 is effectively reduced and suppressed. If adhesion of scattered powder to the region D is suppressed, that is, if the range of adhesion of scattered powder to the left and right side surfaces 19 of the case 10 is limited, when the movable contact 71 and the fixed contact 45 are separated from each other In addition, the scattered powder adhering to the left and right side surfaces 19 of the case 10 disposed close to both the contacts 71 and 45 does not function as a passage for conducting electricity. As a result, in a state where both the contacts 71 and 45 are separated from each other, a high insulation state and a good insulation characteristic and withstand voltage characteristic of the switch 1-1 can be obtained. In other words, the switch 1-1 is reliably turned on and off even when the spatial distance between the both contacts 71 and 45 and the left and right side surfaces 19 of the case 10 is shortened, so that the switch 1-1 can be reduced in size and thickness.

  Further, in this switch 1-1, since the scattering suppression member 250 is formed of a flexible thin plate, the front end side 251 of the scattering suppression member 250 is stored in the contact of the case 10 due to rattling of the movable contact body 70 or the like. Even if the left and right side surfaces 19 of the part 11 are touched, the movement of the movable contact body 70 is not hindered.

  Further, in the switch 1-1, the scattering suppressing member 250 is attached between the massive movable contact 71 and the movable contact body 70. For example, as shown in FIG. You may attach to the opposite surface side to which the movable contact 71 was attached. At any mounting position, the scattering suppression member 250 can be easily mounted without hindering the downsizing of the switch 1-1. Note that it is more effective that the scattering suppression member 250 is installed between the movable contact 71 and the movable contact body 70 because the scattering suppression member 250 can be installed closer to the fixed contact 45 by the thickness of the movable contact body 70. In addition, the range in which the scattered powder adheres to the left and right side surfaces 19 of the contact accommodating portion 11 of the case 10 is preferably suppressed.

  FIG. 11 is a schematic cross-sectional view (a cross-sectional view at a portion corresponding to FIG. 2) of the switch 1-2 according to the second embodiment of the present invention. In this switch 1-2, the same or corresponding parts as those in the switch 1-1 shown in FIGS. Items other than those described below are the same as those of the switch 1-1 shown in FIGS.

  The switch 1-2 is different from the switch 1-1 in the structure of the scattering suppressing member 250-2. FIG. 12 is an enlarged perspective view of the movable contact body 70 to which the scattering suppressing member 250-2 is attached. As shown in the figure, the movable contact 71 is in a lump shape, and is attached to the surface of the movable contact body 70 on the side facing the fixed contact 45. The scattering suppressing member 250-2 is provided with a side wall portion 253-2 by bending a portion projecting from the outer periphery (entire circumference) of the movable contact 71 and projecting left and right toward the fixed contact 45 side at a substantially right angle. The movable contact 71 is configured to cover a part of the outer periphery. That is, both front end sides 251-2 of the scattering suppressing member 250-2 face the fixed contact 45 side, and both front end sides 251-2 are slightly below the front end surface (lower end surface) of the movable contact 71 in this embodiment. positioned. The scattering suppressing member 250-2 used in this embodiment is a rectangular thin plate, and the material thereof is made of metal. Alternatively, a thin plate formed by molding synthetic resin or a synthetic resin film may be used. good.

  FIG. 11 shows a state where the operation knob 150 is fully swung to one side and the switch is turned off and is stable as in FIG. Since the operation of pressing the operation knob 150 to turn on / off the switch 1-2 is the same as that described for the switch 1-1, the description thereof is omitted. FIG. 13 is an enlarged schematic cross-sectional view of a main part in the vicinity of the fixed contact 45 and the movable contact 71 when the switch 1-2 is turned on, and shows a cross section of the EE portion of FIG.

  Then, immediately before the movable contact 71 comes into contact with the fixed contact 45, and immediately after the movable contact 71 in contact with the fixed contact 45 is lifted and the two contacts 71, 45 are separated from each other, an arc discharge occurs between the two contacts 71, 45. May occur. However, in the case of this embodiment, the scattering suppression member 250-2 protrudes from the outer periphery of the movable contact 71 and is bent so that the left and right tip portions face the fixed contact 45 side. Since a part of the outer periphery of the fixed contact 45 is covered, the scattered powder scatters from the outer peripheral side surface of the movable contact 71 toward the left and right side surfaces 19 of the case 10 and the back side. Can be suppressed. As a result, the scattered powder adheres to the left and right side surface regions (the entire region including the region D shown in FIG. 9 and the region D ′ indicated by the dotted line) of the contact accommodating portion 11 that is approaching the movement locus of the movable contact 71. It is effectively reduced and suppressed. If adhesion of scattered powder in the regions D and D ′ is suppressed, that is, if the range of scattered powder adhered to the left and right side surfaces 19 of the case 10 is limited, the movable contact 71 and the fixed contact 45 are separated from each other. In this case, the scattered powder adhering to the side surface of the case 10 disposed close to the both contacts 71 and 45 does not function as a passage for conducting electricity. As a result, in a state where both the contacts 71 and 45 are separated from each other, a high insulation state can be maintained and good insulation characteristics and withstand voltage characteristics of the switch 1-2 can be obtained. In other words, since the switch 1-2 is reliably turned on and off even when the spatial distance between the both contacts 71 and 45 and the left and right side surfaces 19 of the case 10 is shortened, the switch 1-1 can be reduced in size and thickness.

  The thickest scattered powder adheres to the left and right side surfaces 19 of the case 10 in the vicinity of the position immediately before and immediately after the contact points 71 and 45 where the arc discharge occurs, that is, around the contact points of the contact points 71 and 45. Although it is a part, in this switch 1-2, adhesion of the scattered powder to the part is effectively suppressed by the side wall part 253-2. Thus, in a state where the contacts 71 and 45 are separated from each other, the switch 1-2 can obtain better insulation characteristics and withstand voltage characteristics than the switch 1-1.

  Also in this switch 1-2, the scattering suppression member 250-2 is attached between the massive movable contact 71 and the movable contact body 70, but the scattering suppression member 250-2 is configured to connect the movable contact 71 of the movable contact body 70. It may be attached to the opposite side of the attachment. At any mounting position, the scattering suppression member 250-2 can be easily mounted without hindering the downsizing of the switch 1-1.

  14 to 16 are enlarged perspective views of the movable contact body 70 to which the scattering suppression members 250-3 to 250-5 according to the modified example of the scattering suppression member 250-2 are attached. The scattering suppressing member 250-3 shown in FIG. 14 protrudes from the outer periphery (entire periphery) of the movable contact 71, and the side wall portion 253-3 is formed by bending a portion protruding right and left and forward toward the fixed contact 45 side at a substantially right angle. And a part of the outer periphery of the movable contact 71 is covered. That is, each front end side 251-3 of the scattering suppressing member 250-3 faces the fixed contact 45 side, and in this embodiment, is positioned slightly below the front end surface (lower end surface) of the movable contact 71. If comprised in this way, since the area | region surrounding the outer periphery of the movable contact 71 will become larger compared with the said dispersion | distribution suppression member 250-2, adhesion to the left and right side surfaces 19 of the case 10 will be suppressed more effectively. it can.

  The scattering suppressing member 250-4 shown in FIG. 15 protrudes from the outer periphery (entire periphery) of the movable contact 71, and bends the left and right, front and rear portions to the fixed contact 45 side at a substantially right angle, thereby bending the side wall portion 253. -4 is provided to cover the entire outer periphery of the movable contact 71. That is, each front end side 251-4 of the scattering suppressing member 250-4 faces the fixed contact 45 side, and in this embodiment is positioned slightly below the front end surface (lower end surface) of the movable contact 71. If comprised in this way, since the area | region surrounding the outer periphery of the movable contact 71 will become still larger compared with the said dispersion | distribution suppression member 250-2, 3, adhesion of the scattered powder to the left and right side surfaces 19 of the case 10 will be more effective. Can be suppressed. The scattering suppressing member 250-4 has a box shape, but may have another shape such as a cylindrical shape.

  The scattering suppressing member 250-5 shown in FIG. 16 projects from the outer periphery (entire circumference) of the movable contact 71, and a side wall portion 253-5 is provided by bending a portion projecting forward toward the fixed contact 45 side at a substantially right angle. The movable contact 71 is configured to cover a part of the outer periphery. That is, the front end side 251-5 in front of the scattering suppression member 250-5 faces the fixed contact 45 side, and the left and right front end sides 251-5 of the scattering suppression member 250-5 are case like the scattering suppression member 250. Close to the left and right side surfaces of 10 and face each other. Therefore, even if comprised in this way, as much as the front side wall part 253-5 is provided compared with the scattering suppression member 250, adhesion of scattered powder to the left and right side surfaces 19 of the case 10 can be suppressed more effectively.

  FIG. 17 is an enlarged schematic cross-sectional view of the main part in the vicinity of the fixed contact 45 and the movable contact 71 when the switch 1-6 configured using the scattering suppressing member 250-6 is turned on. A cross section is shown. Items other than those described below are the same as those of the switch 1-2. In this scattering suppressing member 250-6, the difference from the scattering suppressing member 250-2 shown in FIG. 12 is that the left and right side wall portions 253-2 shown in FIG. 12 are not bent at a right angle downward. This is a point bent at an obtuse angle in the downward direction (obliquely downward direction). The left and right tip sides 251-6 of the scattering suppressing member 250-6 are located close to the left and right side surfaces 19 of the contact housing part 11 of the case 10. Even if comprised in this way, the effect similar to the said scattering suppression member 250-2 will be produced.

  In each of the above embodiments, the scattering suppressing member according to the present invention is a switch having the above-described structure, that is, at least a pair of the case 10 having the contact accommodating portion 11 inside and the bottom surface of the contact accommodating portion 11 of the case 10. A movable contact body having a fixed contact body 40, a movable contact body support body 50, and a movable contact 71 that is pivotally supported by the movable contact body support body 50 so as to contact and separate from a fixed contact 45 provided on the fixed contact body 40. 70 and an operation knob 150 having an operation body 190 that swings and operates the movable contact body 70 by moving while contacting the upper surface of the movable contact body 70. Although the example applied to the switch is shown, the switch to which the present invention can be applied may be a switch of various other structures.

  That is, the switch according to the present invention may be a switch having any structure as long as the switch is configured to contact and separate the movable contact of the movable contact body with respect to the fixed contact installed in the contact storage portion of the case. . For example, it is not a structure in which the movable contact body is directly swingably supported by the movable contact body support body, but another member is interposed between the movable contact body and the movable contact body support body to move the movable contact body indirectly. It is good also as a structure installed so that rocking is possible with respect to a contact body support body. Moreover, in the said embodiment, although the movable contact body support body was fixed to the case, the structure which installs a movable contact body support body so that it may move with respect to a case may be sufficient.

  Furthermore, the present invention may be applied to a switch in which a movable contact body support is not installed. For example, a switch 1-7 shown in FIG. 18 includes a case 610 having a contact housing portion 611 therein, a fixed contact body 640 installed on the bottom surface of the contact housing portion 611 of the case 610, and a fixed provided on the fixed contact body 640. A movable contact body 670 having a movable contact 671 that contacts and separates from the contact 645, an operation knob 750 installed above the movable contact body 670, and a scattering suppression member 250- installed so as to protrude from the periphery of the movable contact 671 7. The switch 1-7 slides the operation knob 750 in the horizontal direction to bring the operation body 790 provided on the operation knob 750 into contact with the projecting portion 677 provided on the movable contact body 70, thereby pressing the movable contact 671 downward. The movable contact 671 is brought into contact with the fixed contact 645 and turned on. The operation knob 750 may be configured to move the movable contact 671 up and down by moving it up and down, or may be configured to move the movable contact 671 up and down by rotating (or swinging) the operation knob 750.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above-described embodiments, the left and right tip sides 251 of the scattering suppressing member 250 are arranged close to the left and right side surfaces 19 in the contact housing part 11 of the case 10, but in some cases, only one tip side 251 is placed on one side. You may arrange | position close to the side surface 19 of this. Further, the knob outer body 160 and the knob main body 170 may be formed as a single part by integral molding. In addition, the movable contact body support may be formed of an insulating member depending on circumstances. Various changes may be made to the shape, structure, and material of the parts such as the case 10, the fixed contact body 40, the movable contact body support body 50, the short circuit piece 200, the movable contact body 70, the cover 80, the outer case 100, and the operation knob 150. It goes without saying that it is possible.

1-1 switch 10 case 11 contact housing part 17 bottom face 19 side face (left and right side faces)
45 Fixed contact 50 Movable contact body support body 70 Movable contact body 71 Movable contact 250 Scatter suppression member 251 Tip side 253 Side wall

Claims (8)

A case that has at least a bottom surface and a side surface to form a contact housing portion;
A fixed contact installed in the contact storage part of the case;
In a switch comprising: a movable contact having a movable contact that is installed in a contact housing portion of the case and that contacts and separates from the fixed contact;
A scattering suppression member is attached to suppress a range in which scattered powder generated by an arc that protrudes from the periphery of the movable contact and is generated between the movable contact and the fixed contact adheres to the side surface of the case around the movable contact. Switch. The switch according to claim 1,
The movable contact is a mass, and is attached to a surface of the movable contact body facing the fixed contact,
2. The switch according to claim 1, wherein the scattering suppression member is configured to project from an outer periphery of the movable contact toward a side surface of the contact housing portion of the case. The switch according to claim 2,
The switch is characterized in that the scattering suppressing member is attached between the massive movable contact and the movable contact body, or is attached to the opposite side of the movable contact body to which the movable contact is attached. The switch according to claim 3, wherein
The scatter control member is constituted by a thin plate having flexibility. The switch according to claim 4,
The case has a box shape having a contact housing portion therein, and a movable contact body support is installed in the contact housing portion, and the movable contact body is swingably installed with respect to the movable contact body support. A switch characterized by that. The switch according to claim 1,
The movable contact is a mass, and is attached to a surface of the movable contact body facing the fixed contact,
The switch is configured to cover at least a part of the outer periphery of the movable contact by projecting from the outer periphery of the movable contact and directing a tip portion thereof toward the fixed contact. The switch according to claim 6, wherein
The scattering suppression member is attached between the movable contact and the movable contact body, or is attached to the opposite surface side of the movable contact body to which the movable contact is attached. The switch according to claim 7, wherein
The case has a box shape having a contact housing portion therein, and a movable contact body support is installed in the contact housing portion, and the movable contact body is swingably installed with respect to the movable contact body support. A switch characterized by that.

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