Contact device

Abstract

To suppress displacement of a center axis of a screw member with respect to a center of a storage recess in a contact device comprising the storage recess and the screw member which is stored in the storage recess.SOLUTION: A contact device comprises a screw member, a storage recess and a plurality of projections. The screw member includes a regular polygon part. The regular polygon part includes a plurality of corner portions and a plurality of side portions which are positioned between the plurality of corner portions. The storage recess includes a whirl-stop portion. The whirl-stop portion is disposed away from the plurality of side portions and performs whirl stop on the regular polygon part in contact with the plurality of corner portions. The plurality of projections presses the plurality of side portions in a rotation direction around a center axis of the screw member at a position displaced from centers of the plurality of side portions in a view in a first direction. The plurality of projections fixes the screw member to the storage recess.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a contact device. [Background technology]

[0002] Patent Document 1 discloses a contact device including a case, a fixed terminal, and a screw member for screwing together an external terminal such as a bus bar and the fixed terminal. The screw member is housed in a housing recess provided in the case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-048026 Summary of the Invention [Problem to be solved by the invention]

[0004] A screw member to be accommodated in an accommodating recess is generally fixed in the accommodating recess by press fitting. When a screw member is fixed in the accommodating recess by press fitting, there is a problem in that the central axis of the nut is likely to be misaligned with the center of the accommodating recess during press fitting.

[0005] An object of the present invention is to prevent the central axis of the screw member from being misaligned with the center of the accommodating recess in a contact device that includes an accommodating recess and a screw member that is accommodated in the accommodating recess. [Means for solving the problem]

[0006] An electromagnetic relay according to one aspect of the present invention comprises a screw member, an accommodating recess, and multiple protrusions. The screw member includes a regular polygonal portion. The regular polygonal portion includes multiple corners and multiple side portions located between the multiple corners. The accommodating recess accommodates the regular polygonal portion. The accommodating recess includes a rotation prevention portion. The rotation prevention portion is disposed apart from the multiple side portions and contacts the multiple corners to prevent rotation of the regular polygonal portion. The multiple protrusions press the multiple side portions in a rotation direction around the central axis of the screw member at positions offset from the centers of the multiple side portions when viewed from a first direction. The multiple protrusions fix the screw member to the accommodating recess.

[0007] In this contact device, the pressing force of the multiple protrusions pressing the multiple side portions acts on the screw member in the rotation direction around the central axis of the screw member. As a result, the regular polygon portion moves away from the multiple side portions and contacts the anti-rotation portion to prevent rotation, thereby fixing the screw member in the accommodating recess. This prevents the central axis of the screw member from shifting from the center of the accommodating recess. As a result, fastening with the screw member is easier. Furthermore, since the portion to which the torque load is applied during fastening of the screw member is clearly defined, for example, by increasing the strength of the portion of the accommodating recess to which the torque load is applied, the durability of the accommodating recess can be effectively improved.

[0008] The plurality of protrusions may include a first protrusion and a second protrusion arranged point-symmetrically with the first protrusion about the central axis of the screw member. In this case, the screw member can be fixed to the accommodating recess with a small number of protrusions.

[0009] The plurality of sides may include a first side, a second side rotated 120° from the first side with respect to the central axis of the screw member, and a third side rotated 240° from the first side with respect to the central axis of the screw member. The plurality of protrusions may be provided on the first side, the second side, and the third side. In this case, the plurality of protrusions can firmly fix the screw member to the receiving recess.

[0010] The installation recess may have a regular polygonal shape when viewed from the first direction, which can effectively prevent the central axis of the screw member from being misaligned with the center of the installation recess.

[0011] The regular polygonal portion and the installation recess of the screw member may have a regular hexagonal shape when viewed from the first direction. In this case, for example, by using a hexagonal nut, it is possible to effectively prevent the central axis of the screw member from being misaligned with the center of the installation recess.

[0012] The plurality of protrusions may prohibit rotation of the screw member in the tightening direction relative to the regular polygonal portion. In this case, the torque load generated when tightening the screw member can be borne by the plurality of protrusions, thereby effectively increasing the strength of the installation recess.

[0013] The plurality of protrusions may include contact surfaces that come into contact with the plurality of side portions. The contact surfaces may have a shape that conforms to the plurality of side portions. In this case, it is easy to control the direction of the pressing force with which the plurality of protrusions press the plurality of side portions.

[0014] The plurality of protrusions may include chamfered portions formed at portions facing the plurality of side portions, which improves the ease of assembly when fixing the screw member to the receiving recess.

[0015] The contact device may further include a movable contact piece including a movable contact, a fixed terminal, and an outer support part. The fixed terminal may include a fixed contact facing the movable contact piece and an external connection part connected to the external terminal. The outer support part may include an accommodating recess and support the external connection part of the fixed terminal. In this case, fastening of the external connection part to the external terminal is facilitated.

[0016] According to the present invention, in a contact device including an accommodating recess and a screw member accommodated in the accommodating recess, it is possible to prevent the central axis of the screw member from being misaligned with the center of the accommodating recess. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] 10A and 10B are diagrams illustrating a state in which the external connection portion is fastened to the external terminal with a screw. [Figure 4] 10 is a schematic diagram of a first outer support portion of the case as viewed from above. FIG. [Figure 5] FIG. 10 is a schematic side view of the screw member and the plurality of protrusions. [Figure 6] 10 is a schematic diagram of a first outer support portion of a case according to a modified example, viewed from above. FIG. [Figure 7] 10 is a schematic diagram of a first outer support portion of a case according to a modified example, viewed from above. FIG. [Figure 8] 10 is a schematic diagram of a first outer support portion of a case according to a modified example, viewed from above. FIG. [Figure 9] 10 is a schematic diagram of a first outer support portion of a case according to a modified example, viewed from above. FIG. [Figure 10] 10 is a schematic diagram of a first outer support portion of a case according to a modified example, viewed from above. FIG. [Figure 11] 10A and 10B are diagrams illustrating modified examples of the screw member. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a contact device 100 according to one aspect of the present invention will be described below with reference to the drawings. Note that when referring to the drawings, the direction indicated by X1 is the leftward direction, the direction indicated by X2 is the rightward direction, the direction indicated by Y1 is the forward direction, the direction indicated by Y2 is the rearward direction, the direction indicated by Z1 is the upward direction, and the direction indicated by Z2 is the downward direction. These directions are defined for the convenience of explanation and do not limit the arrangement direction of the contact device 100. In this embodiment, the direction from Z1 to Z2 is an example of a first direction.

[0019] 1 and 2, the contact device 100 includes a case 2, a contact block 3, and a drive block 4. The contact device 100 is an electromagnetic relay that opens and closes an electric circuit.

[0020] The case 2 is a substantially rectangular box-shaped body made of an insulating material such as resin, and includes a case body 21, a lid 22, a first inner support 23, a second inner support 24, a first outer support 25, and a second outer support 26.

[0021] The case body 21 has an opening at the front. The lid 22 is attached to the case body 21 so as to close the opening of the case body 21.

[0022] The first and second inner support parts 23, 24 are disposed inside the case main body 21. The first and second inner support parts 23, 24 extend in the left-right direction. The top surfaces of the first and second inner support parts 23, 24 are formed flat. The second inner support part 24 is disposed apart from the first inner support part 23 in the left-right direction.

[0023] The first and second outer support parts 25, 26 are disposed outside the case main body 21. The first and second outer support parts 25, 26 extend in the left-right direction. The top surfaces of the first and second outer support parts 25, 26 are formed flat. The first outer support part 25 is formed to protrude leftward from the case main body 21. The second outer support part 26 is formed to protrude rightward from the case main body 21.

[0024] The contact block 3 includes a first fixed terminal 6, a second fixed terminal 7, and a movable contact piece 8. The first and second fixed terminals 6, 7 are plate-shaped terminals made of a conductive material. The first and second fixed terminals 6, 7 extend in the left-right direction and have a curved shape. The first and second fixed terminals 6, 7 extend from the inside to the outside of the case 2.

[0025] The first fixed terminal 6 includes a first fixed contact 6a, a first contact support portion 6b, a first extension portion 6c, and a first external connection portion 6d. The first fixed contact 6a is disposed inside the case 2. The first contact support portion 6b supports the first fixed contact 6a. In this embodiment, the first fixed contact 6a is separate from the first contact support portion 6b, but may be integral with the first contact support portion 6b. The first extension portion 6c extends leftward from the first contact support portion 6b. The first extension portion 6c is supported by the upper surface of the first inner support portion 23. The first external connection portion 6d is disposed on the left side of the case main body 21 and exposed to the outside. The first external connection portion 6d extends in the left-right direction and is supported by the upper surface of the first outer support portion 25. The first external connection portion 6d includes a first screw insertion hole 6e that penetrates in the up-down direction. As shown in FIG. 3, the first external connection portion 6d is connected to an external terminal 30 such as a bus bar.

[0026] The second fixed terminal 7 is disposed apart from the first fixed terminal 6 in the left-right direction. The second fixed terminal 7 includes a second fixed contact 7a, a second contact support portion 7b, a second extension portion 7c, and a second external connection portion 7d. The second external connection portion 7d includes a second screw insertion hole 7e. The second fixed terminal 7 has a symmetrical shape to the first fixed terminal 6, and therefore detailed description of each component will be omitted.

[0027] The movable contact piece 8 is a plate-shaped terminal that is long in one direction and is made of a conductive material. The movable contact piece 8 is disposed inside the case 2. The movable contact piece 8 extends in the left-right direction. The movable contact piece 8 is disposed opposite the first fixed contact 6a and the second fixed contact 7a in the up-down direction. The movable contact piece 8 is movable in the up-down direction.

[0028] The movable contact piece 8 includes a first movable contact 8a and a second movable contact 8b. The first movable contact 8a is disposed opposite the first fixed contact 6a. The second movable contact 8b is disposed opposite the second fixed contact 7a. The first and second movable contacts 8a, 8b may be integral with the movable contact piece 8.

[0029] The drive block 4 is housed in the case 2. The drive block 4 moves the movable contact piece 8 up and down by electromagnetic force. The drive block 4 includes a movable mechanism 11, a coil 12, a spool 13, a movable core 14, a fixed core 15, a first yoke 16, a second yoke 17, and a return spring 18.

[0030] The movable mechanism 11 is connected to the movable contact piece 8. As shown in FIG. 2, the movable mechanism 11 includes a holder 11a, a drive shaft 11b, and a contact spring 11c. The holder 11a holds the movable contact piece 8. The holder 11a moves integrally with the movable contact piece 8. The drive shaft 11b extends in the vertical direction. The contact spring 11c is disposed between the holder 11a and the drive shaft 11b. The contact spring 11c biases the movable contact piece 8 upward via the holder 11a.

[0031] When a voltage is applied to the coil 12 and it is excited, it generates an electromagnetic force that moves the movable iron core 14 upward. The coil 12 is disposed below the contact block 3. The coil 12 is wound around the spool 13. The spool 13 extends in the vertical direction.

[0032] The first yoke 16 covers the coil 12 from below. The second yoke 17 is disposed around the coil 12 and connected to the first yoke 16. The second yoke 17 has a U-shape.

[0033] The movable iron core 14 is fixed to the drive shaft 11b so as to be movable integrally therewith. The fixed iron core 15 is disposed above the movable iron core 14 and faces the movable iron core 14. The return spring 18 biases the movable iron core 14 downward.

[0034] 4 is a schematic diagram of the first outer support portion 25 of the case 2 as viewed from above. Note that the first external connection portion 6d of the first fixed terminal 6 is not shown in FIG. 2 to 4, the contact device 100 includes a screw member 40, an accommodating recess 50, and a plurality of protrusions 60.

[0035] The screw member 40 is a female-threaded member that screws onto a male-threaded member 70 such as a bolt. In this embodiment, the screw member 40 is a hexagonal nut. The screw member 40 is fixed in the accommodating recess 50. The screw member 40 does not protrude upward from the accommodating recess 50.

[0036] The screw member 40 includes a regular polygonal portion 41. The regular polygonal portion 41 has an outer shape of a regular hexagon when viewed from above. In detail, the regular polygonal portion 41 includes a plurality of corners 42 and a plurality of sides 43.

[0037] The corners 42 extend in the up-down direction. The corners 42 include six corners 42, namely, first to sixth corners 42a to 42f. The side portions 43 include six side portions 43, namely, first to sixth side portions 43a to 43f.

[0038] The first corner 42a is located between the first side 43a and the sixth side 43f. The second corner 42b is located between the first side 43a and the second side 43b. The third corner 42c is located between the second side 43b and the third side 43c. The fourth corner 42d is located between the third side 43c and the fourth side 43d. The fifth corner 42e is located between the fourth side 43d and the fifth side 43e. The sixth corner 42f is located between the fifth side 43e and the sixth side 43f.

[0039] The first side 43a is parallel to the fourth side 43d when viewed from above. The second side 43b is parallel to the fifth side 43e when viewed from above. The third side 43c is parallel to the sixth side 43f when viewed from above. The first to sixth sides 43a to 43f extend in the left-right and up-down directions when viewed from a direction perpendicular to the up-down direction. That is, the first to sixth sides 43a to 43f have a planar shape.

[0040] Fig. 5 is a schematic side view of the screw member 40 and the plurality of protrusions 60. As shown in Fig. 5, the plurality of corners 42 include chamfered portions 44. The chamfered portions 44 are formed at the lower end portions of the plurality of corners 42.

[0041] 4, the screw member 40 includes a through hole 45. The through hole 45 is a hole that passes through the center of the regular polygonal portion 41 in the vertical direction. An internal thread is formed on the inner peripheral surface of the through hole 45.

[0042] The accommodating recess 50 is formed on the upper surface of the first outer support portion 25 of the case 2. The accommodating recess 50 has a shape that is recessed from top to bottom. The accommodating recess 50 overlaps with the first screw insertion hole 6e in the vertical direction. The accommodating recess 50 accommodates the regular polygonal portion 41. The accommodating recess 50 has a shape that can prevent the screw member 40 from rotating. The accommodating recess 50 has a polygonal shape when viewed from above. In this embodiment, the accommodating recess 50 has a regular polygonal shape (here, a regular hexagonal shape) when viewed from above. The center of the accommodating recess 50 when viewed from above overlaps with the central axis A of the screw member 40. A hole is formed in the bottom of the accommodating recess 50 for passing the male screw member 70 through.

[0043] The accommodating recess 50 includes a rotation prevention portion 51 and a plurality of corners 52. The rotation prevention portion 51 comes into contact with the plurality of corners 42 of the screw member 40 to prevent rotation of the regular polygonal portion 41. In other words, the rotation prevention portion 51 limits the rotation of the regular polygonal portion 41 about the central axis of the screw member 40. The rotation prevention portion 51 is disposed away from the plurality of side portions 43. In other words, the rotation prevention portion 51 is away from the first to sixth side portions 43a to 43f and does not come into contact with the first to sixth side portions 43a to 43f.

[0044] The anti-rotation portion 51 has a regular hexagonal shape when viewed from above. The anti-rotation portion 51 includes a plurality of side portions 53. The plurality of side portions 53 includes six side portions 53, namely, first to sixth side portions 53a to 53f.

[0045] The first side 53a is parallel to the fifth side 53d when viewed from above. The second side 53b is parallel to the fifth side 53e when viewed from above. The third side 53c is parallel to the sixth side 53f when viewed from above. The first to sixth sides 53a to 53f extend in the left-right and up-down directions when viewed from a direction perpendicular to the up-down direction. That is, the first to sixth sides 53a to 53f have a planar shape.

[0046] The multiple corners 52 include six corners 52, namely, first to sixth corners 52a to 52f. The first to sixth corners 52a to 52f extend in the up-down direction. The first corner 52a is located between the first side 53a and the sixth side 53f. The second corner 52b is located between the first side 53a and the second side 53b. The third corner 52c is located between the second side 53b and the third side 53c. The fourth corner 52d is located between the third side 53c and the fourth side 53d. The fifth corner 52e is located between the fourth side 53d and the fifth side 53e. The sixth corner 52f is located between the fifth side 53e and the sixth side 53f.

[0047] When viewed from above, the first side portion 53a contacts the second corner portion 42b at a position offset from the center of the first side portion 53a toward the second corner portion 52b. When viewed from above, the second side portion 53b contacts the third corner portion 42c at a position offset from the center of the second side portion 53b toward the third corner portion 52c. When viewed from above, the third side portion 53c contacts the fourth corner portion 42d at a position offset from the center of the third side portion 53c toward the fourth corner 52d. When viewed from above, the fourth side portion 53d contacts the fifth corner portion 42e at a position offset from the center of the fourth side portion 53d toward the fifth corner 52e. When viewed from above, the fifth side portion 53e contacts the sixth corner portion 42f at a position offset from the center of the fifth side portion 53e toward the fifth corner 52f. The sixth side portion 53f contacts the first corner portion 42a at a position shifted from the center of the sixth side portion 53f toward the first corner portion 52a.

[0048] The multiple protrusions 60 are provided in the accommodating recess 50. The multiple protrusions 60 are formed integrally with the accommodating recess 50. The multiple protrusions 60 are arranged between the anti-rotation portion 51 and the multiple side portions 43. The multiple protrusions 60 protrude from the anti-rotation portion 51. Note that the multiple protrusions 60 may be separate from the accommodating recess 50. Also, the multiple protrusions 60 may be formed integrally with the screw member 40.

[0049] The multiple protrusions 60 are arranged in contact with the multiple side portions 43 at positions offset from the centers of the multiple side portions 43 when viewed from above. The multiple protrusions 60 apply a pressing force to the regular polygon portion 41 in a first rotation direction R1 about the central axis of the screw member 40, thereby fixing the screw member 40 to the installation recess 50. In this embodiment, the multiple protrusions 60 apply a pressing force to the multiple corner portions 42 in a clockwise direction against the regular polygon portion 41, with the central axis A of the screw member 40 as the center, as shown in FIG.

[0050] The multiple protrusions 60 prohibit rotation of the screw member 40 in the tightening direction relative to the regular polygonal portion 41. The tightening direction of the screw member 40 is opposite to the first rotation direction R1 around the central axis of the screw member 40. The multiple protrusions 60 receive a torque load when the screw member 40 is tightened.

[0051] As shown in FIG. 5, the multiple protrusions 60 are entirely disposed within the accommodating recess 50. The multiple protrusions 60 extend upward from the bottom of the accommodating recess 50. The multiple protrusions 60 extend upward beyond the chamfered portion 44. The multiple protrusions 60 include chamfered portions 60a. The chamfered portions 60a are formed at the upper ends of the portions facing the multiple side portions 43. The chamfered portions 60a have a rounded or tapered shape.

[0052] The multiple protrusions 60 include two protrusions 60, a first protrusion 61 and a second protrusion 62. The first protrusion 61 is disposed between the first side portion 43a and the first side portion 53a. The first protrusion 61 protrudes in a direction from the first side portion 53a toward the first side portion 43a. The first protrusion 61 is disposed in contact with the first side portion 43a at a position shifted toward the first corner portion 42a from the center of the first side portion 43a when viewed from above. The first protrusion 61 applies a pressing force to the regular polygon portion 41 in the first rotation direction R1. The first protrusion 61 includes a contact surface 61a that contacts and presses the first side portion 43a. The contact surface 61a has a curved shape.

[0053] The second protrusion 62 is disposed between the fourth side portion 43d and the fourth side portion 53d. The second protrusion 62 protrudes from the fourth side portion 53d toward the fourth side portion 43d. The second protrusion 62 is disposed in contact with the fourth side portion 43d at a position shifted from the center of the fourth side portion 43d toward the fourth corner portion 42d when viewed from above. The second protrusion 62 and the first protrusion 61 are disposed point-symmetrically with respect to the central axis A of the screw member 40. The second protrusion 62 applies a pressing force to the regular polygon portion 41 in the first rotational direction R1. The second protrusion 62 includes a contact surface 62a that contacts and presses the fourth side portion 43d. The contact surface 62a has a curved shape.

[0054] In this embodiment, when the screw member 40 is fixed in the accommodating recess 50, the anti-rotation portion 51 prevents the regular polygon portion 41 from moving in the first rotation direction R1, and the multiple protrusions 60 prevent the regular polygon portion 41 from moving in the direction opposite to the first rotation direction R1.

[0055] In the contact device 100 configured as described above, the pressing force of the multiple protrusions 60 pressing the multiple side portions 43 acts on the screw member 40 in a first rotation direction R1 around the central axis of the screw member 40. As a result, the regular polygon portion 41 moves away from the multiple side portions 53 and contacts the anti-rotation portion 51 to be prevented from rotating, thereby fixing the screw member 40 to the accommodating recess 50. This prevents the central axis A of the screw member 40 from shifting from the center of the accommodating recess 50. As a result, the external terminal 30 and the first external connection portion 6d of the first fixed terminal 6 can be easily fastened together by the screw member 40 and the male screw member 70. Furthermore, when the screw member 40 is fastened, the portion to which a torque load is applied is clearly defined. Therefore, for example, by increasing the strength of the portion of the accommodating recess 50 to which a torque load is applied, the durability of the accommodating recess 50 can be effectively improved.

[0056] The second outer support portion 26 of the contact device 100 is provided with components corresponding to the screw member 40, the accommodating recess 50, and the plurality of protrusions 60.

[0057] The above describes an embodiment of an electromagnetic relay according to one aspect of the present invention, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention.

[0058] 6, the contact surface 61a of the first protrusion 61 may have a shape that follows the first side portion 43a with which the contact surface 61a comes into contact. The contact surface 62a of the second protrusion 62 may have a shape that follows the fourth side portion 43d with which the contact surface 62a comes into contact.

[0059] 7, the multiple protrusions 60 may apply a pressing force to the regular polygonal portion 41 in the tightening direction of the screw member 40 (second rotational direction R2) to fix the screw member 40 to the installation recess 50. The second rotational direction R2 is the opposite direction to the first rotational direction R1. Here, in FIG. 7, the multiple protrusions 60 apply a pressing force to the multiple corners 42 of the screw member 40 in a counterclockwise direction against the regular polygonal portion 41 around the central axis A of the screw member 40.

[0060] The number of the plurality of protrusions 60 may be three or more. For example, the plurality of protrusions 60 may be further arranged between the second side portion 43b and the second side portion 53b. Alternatively, the number of the plurality of protrusions 60 may be the same as the number of the plurality of side portions 43. In other words, the plurality of protrusions 60 may be provided so that all of the plurality of side portions 43 are in contact with the plurality of protrusions 60.

[0061] The multiple protrusions 60 do not necessarily have to protrude from the anti-rotation portion 51. The multiple protrusions 60 may be configured to apply a pressing force around the central axis of the screw member 40 to the regular polygonal portion 41. For example, the first protrusion 61 may protrude from the sixth side portion 53f toward the first side portion 43a and come into contact with the first side portion 43a.

[0062] 8, the multiple protrusions 60 may include a first protrusion 61, a second protrusion 162, and a third protrusion 163. The second protrusion 162 is disposed at a position rotated 120° in the first rotation direction R1 from the first protrusion 61. The third protrusion 163 is disposed at a position rotated 120° in the first rotation direction R1 from the second protrusion 162. Alternatively, the first protrusion 61 may be disposed between the second side portion 43b and the second side portion 53b, the second protrusion 162 may be disposed between the fourth side portion 43d and the fourth side portion 53d, and the third protrusion 163 may be disposed between the sixth side portion 43f and the sixth side portion 53f.

[0063] The shapes of the regular polygonal portion 41 and the anti-rotation portion 51 may be changed. For example, as shown in Fig. 9, the regular polygonal portion 41 and the anti-rotation portion 51 may be square when viewed from above. Alternatively, they may be regular pentagonal, regular heptagonal, or regular octagonal.

[0064] As shown in FIG. 10, the first outer support portion 25 may be formed with a plurality of recessed portions 25a and a plurality of beam portions 25b. The recessed portions 25a are formed around the installation recess 50. The recessed portions 25a have a shape that is recessed from top to bottom. The beam portions 25b are disposed between the plurality of recessed portions 25a. The beam portions 25b are disposed in portions where a torque load is applied during screw tightening. The beam portions 25b are disposed near portions that receive loads from the plurality of corner portions 42 of the regular polygonal portion 41 during screw tightening. In the embodiment shown in FIG. 10, six recessed portions 25a and six beam portions 25b are provided.

[0065] In the above embodiment, the screw member 40 is a hexagonal nut, but as shown in Fig. 11, the screw member 40 may be a bolt 90. In this case, the head 90a of the bolt 90 is accommodated in the accommodation recess 50. The head 90a of the bolt 90 includes a structure similar to that of the regular polygon portion 41.

[0066] In the above embodiment, the contact device 100 is an electromagnetic relay, but the contact device 100 does not necessarily have to be an electromagnetic relay, and the present invention may be applied to contact devices of other configurations. [Explanation of symbols]

[0067] 40 Screw member 41 Regular polygon section 42 Multiple corners 43 Multiple Edges 50 Recessed storage area 51 Anti-rotation part 60 Multiple protrusions 60a Chamfered part 61 1st protrusion 62 2nd protrusion 61a Contact surface 62a Contact surface 100 Contact device

Claims

1. a screw member including a regular polygonal portion including a plurality of corners and a plurality of sides located between the plurality of corners; an accommodation recess that accommodates the regular polygonal portion and includes anti-rotation portions that are disposed apart from the plurality of side portions and contact the plurality of corner portions to prevent rotation of the regular polygonal portion; a plurality of protrusions arranged in contact with the plurality of side portions at positions offset from the centers of the plurality of side portions when viewed from a first direction, the protrusions applying a pressing force to the regular polygonal portion in a rotational direction around the central axis of the screw member to fix the screw member to the accommodating recess; Equipped with the anti-rotation portion is not in a positional relationship parallel to the plurality of side portions when the state in which the screw member is fixed in the accommodating recess is viewed from the first direction. Contact device.

2. The plurality of protrusions include a first protrusion and a second protrusion disposed point-symmetrically with the first protrusion with respect to a central axis of the screw member. The contact device according to claim 1 .

3. the plurality of side portions include a first side portion, a second side portion rotated 120° from the first side portion with respect to the central axis of the screw member, and a third side portion rotated 240° from the first side portion with respect to the central axis of the screw member, The plurality of protrusions are provided on the first side portion, the second side portion, and the third side portion. The contact device according to claim 1 .

4. The accommodating recess has a regular polygonal shape when viewed from the first direction. The contact device according to any one of claims 1 to 3.

5. the regular polygonal portion and the accommodating recess of the screw member have a regular hexagonal shape when viewed from the first direction; The contact device according to claim 4.

6. the plurality of protrusions prohibit rotation of the screw member in the tightening direction relative to the regular polygonal portion; The contact device according to any one of claims 1 to 5.

7. the plurality of protrusions include contact surfaces that come into contact with the plurality of side portions, The contact surface has a shape that conforms to the plurality of side portions. The contact device according to any one of claims 1 to 5.

8. The plurality of protrusions include chamfered portions formed at portions facing the plurality of side portions. The contact device according to any one of claims 1 to 6.

9. a movable contact piece including a movable contact; a fixed terminal including a fixed contact facing the movable contact piece and an external connection portion connected to an external terminal; an outer support portion including the accommodating recess and supporting the external connection portion of the fixed terminal; Equipped with The contact device according to any one of claims 1 to 7.

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