Steering wheel with air bag device

The present invention relates to a steering wheel with an airbag device mounted on a vehicle, and more particularly to a steering wheel in which the airbag device is supported and arranged by a horn switch mechanism.

[0002] Conventionally, as a steering wheel in which this type of airbag device is supported and arranged by a horn switch mechanism, the one shown in FIG. 1 is known (actual square root extraction No. 2-143734). See publication).

[0003] In this steering wheel W0, the airbag device 4 is arranged in the upper center of the steering wheel main body 1 with the horn switch mechanism 10 interposed therebetween. The steering wheel body 1 refers to a part of the steering wheel W0 other than the airbag device 4 and the horn switch mechanism 10.

[0004] The airbag device 4 includes an inflatable bag-shaped airbag 5, an inflator 6 that supplies expansion gas to the airbag 5, a pad 7 that covers the folded airbag 5, and an airbag. It was configured with 5, an inflator 6, and a bag holder 8 to hold the pad 7.

[0005] The horn switch mechanism 10 is arranged in the front-rear direction below each of the left and right sides of the bag holder 8. Note that FIG. 1 is a cross-sectional view of the steering wheel W0 in the front-rear direction.

[0006] Each horn switch mechanism 10 has a fixed side member 11 made of sheet metal connected to a core metal 2 as a steering wheel main body 1 and having fixed side contacts 14 and 14 arranged at ends in the front-rear direction, and a fixed side. A movable side member 12 made of sheet metal, which is arranged above the member 11 and has movable side contacts 15 and 15 arranged at the end in the front-rear direction, is provided, and between the movable side member 12 and the fixed side member 11. , Coil springs 16 and 16 are arranged as urging means for urging the movable side member 12 upward, and further, the movable side member 12 is movable as a regulating member for regulating the separation distance from the fixed side member 11. It was configured with a flanged bolt 19 screwed from the side member 12 to the core metal 2.

[0007] A lead wire (not shown) is connected to each movable side member 12 so as to conduct to the positive electrode side of the horn operating circuit, and each fixed side member 11 is connected to the negative electrode of the horn operating circuit via the core metal 2. It was configured to conduct to the side.

[0008] Then, the pair of fixed side contacts 14 and movable side contacts 15 are supposed to form a switch main body 13.

[0009] Further, the coil spring 16 and the flanged bolt 19 are arranged by insulating the movable side member 12 and the fixed side member 11 by a predetermined insulating spacers 17 and 18 and a rubber ring 20.

[0010] Further, each movable side member 12 is formed with a mounting piece (not shown) for bolting the bag holder 8.

However, in the conventional steering wheel W0, the horn switch mechanism 10 is arranged on both the left and right sides below the heavy airbag device 4, and the airbag device 4 is placed on both the left and right sides. The structure was such that the coil spring 16 of the horn switch mechanism 10 swingably supported the horn switch mechanism 10 from below.

[0012] Therefore, if the coil spring 16 having a low spring load is used as the urging means of the horn switch mechanism 10, the airbag device 4 easily swings laterally and tilts due to the vibration of the vehicle or the like, which is not possible. The horn switch mechanism 10 may be turned on as necessary.

[0013] That is, the center of gravity of the total weight of the members that are urged and supported upward by all the coil springs 16 (in the conventional example, a total of four coil springs 16), that is, the airbag device 4 and the movable side member 12. Since G is located far higher (30 mm or more) above the coil spring 16, for example, if the coil spring 16F on the front side is the center of the rotational moment, the center of gravity G will swing backward in the lateral direction. As for the motion, if the rocking force is P and the distance between the center of gravity G and the coil spring 16F in the height direction is L, a P × L rotational moment is applied to the coil spring 16B on the rear side. It becomes. This rotational moment PL compresses the coil spring 16B and causes the movable side contact 15B on the rear side to come into contact with the fixed side contact 14B, which may lead to a situation in which the switch body 13B is made conductive.

Therefore, as the coil spring 16 as the urging means of the horn switch mechanism 10, a coil spring 16 having a high spring load is used, and the operating load of the horn switch mechanism 10 becomes large, so that the horn switch mechanism 10 becomes large. The operation feeling of was getting worse.

[0015] The present invention solves the above-mentioned problems, and even if a heavy airbag device is supported and arranged by the horn switch mechanism, the operation feeling of the horn switch mechanism is improved. It is an object of the present invention to provide a steering wheel with a device.

[Means for Solving the Problems] In the steering wheel according to the present invention, an airbag device supported by a horn switch mechanism is arranged on an upper portion of the steering wheel main body, and the airbag device can be expanded. It is configured to include a folded bag-shaped airbag, an inflator that supplies an expansion gas to the airbag, a pad that covers the folded airbag, and a bag holder that holds the airbag inflator pad. The horn switch mechanism is configured to include a plurality of switch configurations that have a fixed side contact, a movable side contact, and an urging means and are assembled in advance, and by pushing down the pad, the urging means. A steering wheel with an airbag device that compresses and brings the movable side contact into contact with the fixed side contact, and the support plate provided with a plurality of base body portions for connecting the switch configurations is described above. The bag holder is configured to include a connection piece connected to the steering wheel main body below the base main body portion, and the bag holder is upward from a horizontal plate portion having a hole into which the inflator can be inserted and an edge of the horizontal plate portion. The inflator is configured to include a connecting plate portion extending to the side and a plurality of mounting pieces extending outward from the upper end of the connecting plate portion and arranged above each switch configuration. The urging means is arranged between the plurality of base body portions and the mounting piece portions located above the horizontal plate portion of the held bag boulder, and further, the switch component of at least one of the switches. The urging means is arranged on the main body of each stand of the support plate so as to be arranged at a height substantially equal to the height of the center of gravity of the total weight of the parts urged upward by all the urging means. The switch components are coupled, and the mounting pieces of the bag holder in the pre-assembled airbag device are arranged above the switch components, so that the airbag device is attached to the horn switch mechanism. It is characterized in that it is supported and the connecting piece of the support plate is connected to the steering wheel main body.

[0017] Then, the urging means arranged at a height substantially equal to the height of the center of gravity of the total weight of the parts urged upward by all the urging means has a height near the center in the vertical direction. , It is desirable to arrange them so as to match the height of the center of gravity.

[0018] Further, it is desirable to arrange all of the urging means at a height substantially equal to the height of the center of gravity of the total weight of the parts urged upward by all the urging means.

[Effect of the Invention] In the steering wheel according to the present invention, at least one urging means has a height substantially equal to the height of the center of gravity of the total weight of the parts urged upward by all the urging means. Have been placed.

Therefore, if one urging means that is not arranged near the height position of the center of gravity is set as the center of the rotational moment, the lateral swing of the center of gravity G of the air bag device or the like is the force of the swing. P, the distance between the center of gravity G and the urging means located near the center of gravity height position in the height direction is L, and P × L for the urging means located near the center of gravity height position. The rotational moment of is applied.

[0021] However, since L is close to zero in this rotational moment PL, it is difficult to cause a compressing action on the urging means arranged near the height position of the center of gravity, so that the spring load is low. Even if the urging means is used or the number of urging means installed is reduced to reduce the operating load of the horn switch mechanism, it is possible to prevent the switch body from being made conductive.

Therefore, in the steering wheel according to the present invention, even if a heavy airbag device is supported and arranged by the horn switch mechanism, the operating load of the horn switch mechanism can be reduced, so that the horn switch mechanism can be reduced. The operation feeling can be improved.

[0023] Then, if the vicinity of the center of the urging means arranged near the center of gravity height position of the airbag device or the like is arranged at the center of gravity height position, the above-mentioned L is further brought closer to zero. Therefore, the operating load of the horn switch mechanism can be reduced by using an urging means having a low spring load, and all the urging means can be arranged near the center of gravity height position of the airbag device or the like. For example, when each rotational moment is taken into consideration with each urging means as the center of the rotational moment, all of these rotational moments can be suppressed to near zero, so an urging means having a lower spring load is used. Since the operating load of the horn switch mechanism can be reduced in the same manner, it is possible to further improve the operating feeling of the horn switch mechanism.

[Embodiments of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 2 to 4, the steering wheel W1 of the embodiment includes an annular ring portion R, a boss portion B arranged at the center of the ring portion R, and a ring portion R and a boss portion B. It is configured to include three spoke portions S that connect the two spokes, and is connected to the steering wheel main body 21, the airbag device 30 arranged above the boss portion B, and the steering wheel main body 21 on the components. It is composed of a horn switch mechanism 40 that supports the airbag device 30 and a horn switch mechanism 40.

[0026] The steering wheel main body 21 refers to a portion excluding the airbag device 30 and the horn switch mechanism 40, and is a core metal arranged so as to connect each portion of the ring portion R, the boss portion B, and the spoke portion S. 22 is provided, and the ring portion core metal 23 of the core metal 22 and each spoke portion core metal 25 on the ring portion core metal 23 side are coated with a coating layer 26 made of synthetic resin. The core metal 24 of the portion of the boss portion B is integrally formed with the steel boss 24a connected to the steering shaft (not shown) and the ring portion core metal 23 and the spoke portion core metal 25 so as to cover the periphery of the boss 24a. It is composed of a covering portion 24b made of an aluminum alloy or the like. The spoke portion core metal 25B on the rear side is divided into two parts and connected to the covering portion 24b side of the boss portion core metal 24. Further, the steering wheel main body 21 includes a lower cover 27 screwed to the core metal 22 so as to cover the lower part of the boss portion B.

[0027] The airbag device 30 includes an inflatable bag-shaped airbag 31, an inflator 33 that supplies expansion gas to the airbag 31, a pad 34 that covers the folded airbag 31, and an airbag. It is configured with 31, an inflator 33, and a bag holder 35 for holding the pad 34.

[0028] The inflator 33 is configured to include a substantially columnar main body 33a having a gas discharge port 33b on the upper portion, and a flange 33c protruding from the outer peripheral surface of the main body 33a.

[0029] The pad 34 is made of synthetic resin and has a ceiling wall portion 34a that breaks a predetermined portion when the airbag 31 expands, and a substantially hexagonal tubular side wall portion 34b that extends downward from the vicinity of the outer peripheral edge of the ceiling wall portion 34a. , Is configured. On the inner peripheral surface of the side wall portion 34b, a locking groove 34c for locking the locking claw 37a provided on the side wall portion 37 of the bag holder 35, which will be described later, is formed at a predetermined position. Further, on the lower surface of the ceiling wall portion 34a, a plurality of ribs (not shown in the figure) are formed in contact with the mounting piece portion 39 of the bag holder 35, which will be described later.

[0030] The holding of the airbag 31 and the inflator 33 by the bag holder 35 includes a plurality of bolts (not shown) in which the annular retainer 32 arranged in the airbag 31 extends downward, and these bolts are attached to the airbag 31. This is done by penetrating the bag holder 35 and the flange 33c of the inflator 33 and fixing them with nuts. Further, the pad 34 is held by the bag holder 35 by stopping the rivet 60 on the side wall portion 34b of the pad and locking the locking claw 37a to the locking groove 34c.

[0031] The bag holder 35 is made of sheet metal and has a horizontal plate portion 36 having an insertion hole 36a in which the inflator main body portion 33a can be inserted from below in the center, and both left and right sides near the front edge side and the rear edge of the horizontal plate portion 36. It is configured to include a side wall portion 37 extending in a V-shaped cross section from the side, and three connecting plate portions 38 extending upward from both the left and right edges and the trailing edge of the horizontal plate portion 36.

[0032] Each side wall portion 37 is formed with a locking claw 37a that is locked in the locking groove 34c of the pad side wall portion 34b, and has a mounting hole (not shown) for fixing the pad side wall portion 34b to the rivet 60. It is formed.

A mounting piece portion 39 extending laterally outward is formed at the upper end of each connecting plate portion 38, and a mounting hole 39a into which a nut 39b is welded is formed in each mounting piece portion 39. .. Each of these mounting pieces 39 serves as a portion for connecting the airbag device 30 to the horn switch mechanism 40 and a portion forming a part of the movable side member 48 of the horn switch mechanism 40. Further, a lead wire (not shown) is connected to the bag holder 35 so as to conduct electricity to the positive electrode side of the horn operating circuit.

[0034] The horn switch mechanism 40 includes a fixed side member 41 connected to the spoke portion core metal 25, a movable side member 48 arranged above the fixed side member 41, and a fixed side member 41 and a movable side member 48. A coil spring 55 as an urging means for urging the movable side member 48 upward, and a flanged bolt 56 as a regulating member for regulating the separation distance of the movable side member 48 from the fixed side member 41. And is configured with.

[0035] In the case of the embodiment, the fixed side member 41 is composed of a support plate 42 bolted to the left and right spoke portion cores 25L / 25R, a support grommet 47, and a fixed side contact material 51. There is.

[0036] The support plate 42 is made of sheet metal, and as shown in FIGS. It is configured to include a support base 44 that extends upward and extends outward from the upper end.

[0037] Each support base portion 44 is composed of a vertical plate portion 44a extending upward from the connecting rod portion 43 and a base main body portion 44b extending outward from the upper end of the vertical plate portion 44a. In the center, an assembly hole 44c is formed in which the hypotenuse side of a substantially right triangle hole is attached to both edges of the symmetrical position of the circular hole, and further, small diameters are formed on both sides of the assembly hole 44c. A circular locking hole 44d is formed.

[0038] Further, in the vicinity of the vertical plate portions 44a on both the left and right sides of the connecting rod portion 43, a connecting piece 45 cut downward is provided, and a support plate 42 is attached to each connecting piece 45 with a spoke portion core metal 25L. A nut 46 for fixing the bolt 58 to 25R is fixed.

[0039] As shown in FIG. 6, the support grommet 47 is formed in a substantially cylindrical shape from a synthetic resin having an insulating property such as polyacetal, and has an opening shape of an assembly hole 44c of each support base portion 44 at the lower portion. The locking plate portion 47a corresponding to the above is arranged, and a concave groove 47c corresponding to the arcuate portion of the assembly hole 44c is formed in the upper part of the locking plate portion 47a. A protrusion 47b to be inserted into the locking hole 44d is formed on the upper surface of the locking plate portion 47a. Further, the support grommet 47 is formed with a pair of locking step portions 47d and a concave groove 47e at symmetrical positions on the outer peripheral surface. The pair of locking step portions 47d serve as a portion for locking the fixed side contact material 51 described later, and the pair of concave grooves 47e serve as a portion for arranging the locking claw 49b of the insulating spacer 49 described later so as to be movable downward. Become.

[0040] The fixed-side contact member 51 is formed of spring steel and has an annular fixed-side contact 52 and a locking piece portion 51a extending downward from a symmetrical position on the outer peripheral edge of the fixed-side contact 52. It is configured to include a spring piece portion 51c that curves and extends from the lower end of the locking piece portion 51a. Each locking piece portion 51a is formed with a locking claw 51b protruding inward so as to be locked to the locking step portion 47d of the support grommet 47. For each spring piece portion 51c of the fixed side contact material 51, the locking plate portion 47a is inserted into the assembly hole 44c of the support base portion 44, the support grommet 47 is rotated by 90 °, and the protrusion 47b of the locking plate portion 47a is formed. When the bayonet is connected so as to be inserted into the locking hole 44d of the support base 44, the upper surface of the locking plate 47a is pressed by pressing the peripheral edge of the assembly hole 44c on the upper surface side of the base body 44b of the support base 44. Is pressed against the peripheral edge of the assembly hole 44c on the lower surface side of the base body 44b.

[0041] The fixed-side contact 52 is arranged on the upper end surface of the support grommet 47 when each locking claw 51b of the fixed-side contact member 51 is locked to the locking step portion 47d of the support grommet 47. .. Further, the fixed side contact 52 of the fixed side contact material 51 has a spring piece portion 51c, a support plate 42, and a core metal of the fixed side contact material 51 when the support plate 42 is bolted to the spoke portion core metal 25R / 25L. It will conduct to the negative electrode side of the horn operating circuit via 25R and 25L.

[0042] In the case of the embodiment, the movable side member 48 is composed of each mounting piece portion 39 of the bag holder 35, an insulating spacer 49, and a movable side contact material 53.

[0043] The insulating spacer 49 is formed in a substantially cylindrical shape from a synthetic resin having an insulating property such as polyacetal, and as shown in FIG. 6, has a spring seat 49a protruding like a collar on the outer peripheral surface of the upper part and a spring seat 49a protruding from the lower part. It is configured to include two locking claws 49b protruding downward and locking steps (not shown) formed at three positions on the inner peripheral surface. Each locking claw 49b is arranged in the groove 47e of the support grommet 47 and is allowed to move downward with respect to the annular fixed side contact 52 of the fixed side contact member 51 attached to the support grommet 47. It will be locked. Further, a locking step portion (not shown) locks the movable side contact material 53, which will be described later.

[0044] The movable side contact material 53 is formed of spring steel, and has an annular base portion 53a, a locking piece portion 53b extending downward from three locations on the outer peripheral edge of the base portion 53a, and a lower end of each locking piece portion 53b. It is configured to include a movable side contact 54 extending outward from the spring. Each locking piece portion 53b is formed so that a locking claw 53c locked to a locking step portion (not shown) of the insulating spacer 49 projects outward.

[0045] Each movable side contact 54 is arranged on the lower end surface of the insulating spacer 49 when each locking claw 53c of the movable side contact material 53 is locked to a locking step portion (not shown) of the insulating spacer 49. Will be.

[0046] Then, in the case of the embodiment including the fixed side contact 51 and the movable side contact 54 constituting the switch body 50, the support grommet 47, the insulating spacer 49, and the coil spring 55 are assembled in advance. The switch configuration H will be formed. In this switch configuration H, the fixed side contact material 51 is assembled to the support grommet 47, the movable side contact material 53 is attached to the insulating spacer 49, the lower end of the coil spring 55 is applied to the locking plate portion 47a of the support grommet 47, and the coil. The upper end of the spring 55 is applied to the spring seat 49a of the insulating spacer 49, and each locking claw 49b of the insulating spacer 49 is inserted into the concave groove 47e of the support grommet 47, and is engaged with the fixed side contact 52 of the fixed side contact material 51. If stopped, it can be formed.

Further, in each switch configuration H formed in this way, the locking plate portion 47a of the support grommet 47 is bayonet-coupled to the assembly hole 44c of the base body portion 44b in the support base portion 44 of the support plate 42. Further, each mounting piece 39 in the bag holder 35 of the airbag device 30 assembled in advance is arranged above each switch configuration H, and the flanged bolt 56 is inserted into each switch configuration H from below. Then, if it is screwed into the nut 39b of the mounting piece 39, the airbag device 30 is supported by the horn switch mechanism 40.

[0048] As described above, in the airbag device 30, the retainer 32 is arranged in the airbag 31, the airbag 31 is folded, and a bolt (not shown) extending from the retainer 32 is attached to the bag holder 35 and the inflator flange. It is inserted through the portion 33c and fastened with a nut, and further, the locking claw 37a of the bag holder side wall portion 37 is locked in each locking groove 34c of the pad side wall portion 34b, and the pad side wall portion 34b is attached to the bag holder side wall portion 37. If the rivet 60 is stopped, the airbag device 30 can be assembled.

After that, when the airbag device 30 is supported by the horn switch mechanism 40, each connection piece 45 provided on the support plate 42 in the horn switch mechanism 40 is applied to the spoke portion core metal 25L / 25R, and the core metal is applied. The horn switch mechanism 40 can be connected to the steering wheel body 21 by inserting the core metal 25L / 25R from the back side of the 25L / 25R and screwing the bolt 58 into the nut 46 of each connection piece 45. Wheel W1 can be assembled.

[0050] At the time of this assembly, the steering wheel main body 21 is connected in advance to the boss 24a of the boss portion core metal 24 to the steering shaft of the vehicle.

Further, when the flanged bolt 56 is screwed into the nut 39b, the movable side contact 54 of each switch configuration H has a movable side contact material 53 on the periphery of the mounting hole 39a in the mounting piece portion 39 of the bag holder 35. When the base portion 53a of the above is pressure-welded, it becomes conductive to the positive electrode side of the horn operating circuit via a lead wire (not shown). Further, in the fixed side contact 52 of each switch configuration H, when the support plate 42 is bolted 58 to the spoke portion core metal 25R / 25L, the spring piece portion 51c / support plate 42 / core metal of the fixed side contact material 51 It will conduct to the negative electrode side of the horn operating circuit via 25R / 25L.

When the horn switch mechanism 40 is connected to the steering wheel main body 21 in this way, in the case of the embodiment, the base main body 44b in the support base 44 of the support plate 42 constituting the fixed side member 41. Each of the tips extending outward is configured to be abutted and supported by the coating layer 26 of each spoke core metal 25 in the steering wheel body 21.

[0053] Further, in the case of the embodiment, the shape in which the base body portion 44b of each support base portion 44 and the mounting piece portion 39 of the bag holder 35 in the support plate 42 are arranged in the vicinity of the coating layer 26 of each spoke portion S. Therefore, the arrangement of the coil springs 56 of each switch configuration H is supported by being urged upward by all the coil springs 56, that is, in the case of the embodiment, the airbag device 30 (airbag 31 / retainer). 32 Inflator 33 Pad 34 Bag holder 35 Lead wire etc.) Movable side member 48 (Mounting piece 39 Insulation spacer 49 Movable side contact material 53) Height of center of gravity G of total weight of flanged bolt 56 In addition, each coil spring 56 is configured to match the central portion in the vertical direction.

Therefore, in the steering wheel W1 of the embodiment, as shown in FIG. 2, if one coil spring 55B is the center of the rotational moment, the lateral swing of the center of gravity G of the airbag device 30 or the like is caused. , The rocking force is P, the distance between the center of gravity G and the coil spring 55A arranged at the height of the center of gravity G is L, and the rotation of P × L with respect to the coil spring 55A. A moment is applied, but since L is zero, it is difficult for this rotational moment PL to cause a compression action on the coil spring 55A. Therefore, a coil spring 55A having a high spring load is used. Even if it is not used, it is possible to prevent the switch body 50 from being unnecessarily conducted. Similarly, the other coil springs 55B and 55C can be used with a low spring load because the rotational moment due to the swing of the airbag device 30 or the like becomes small.

Therefore, in the steering wheel W1 of the embodiment, even if the heavy airbag device 30 is supported and arranged by the horn switch mechanism 40, it is possible to use the coil spring 55 having a low spring load. Therefore, the operation feeling of the horn switch mechanism 40 can be improved. By the way, in the case of the embodiment, even if the airbag device 30 having substantially the same weight as the conventional one is used, the operating load at the time of operating the horn can be reduced to two-thirds of the conventional one.

[0056] The normal horn operation is performed by pushing down the ceiling wall portion 34a of the pad 34 in the airbag device 30, and at that time, the coil spring 55 of each horn switch configuration H is compressed to switch. The movable side contact 54 of the movable side contact material 53 constituting the main body 50 comes into contact with the fixed side contact 52 of the fixed side contact material 51, and the horn operates.

[0057] Further, in the embodiment, the vertical central portion of all the coil springs 55 in the horn switch mechanism 40 is set to the height of the center of gravity G of the total weight of the parts urged upward by all the coil springs 55. Although the case of matching is shown, the arrangement of each switch configuration H may be moved up and down so that the center of gravity G is arranged within the range between the upper and lower ends of each coil spring 55. In this case, although the effect of the embodiment cannot be obtained, the operating load of the horn switch mechanism 40 can be reduced as compared with the conventional example.

[0058] Further, the center of gravity G may be arranged within the range between the upper and lower ends of at least one coil spring 55, and the center of gravity G may not be arranged between the upper and lower ends of the other coil springs 55. .. In this case, although the effect of the above modification cannot be obtained, the operating load of the horn switch mechanism 40 can be reduced as compared with the conventional example.

Furthermore, if at least one coil spring 55 is arranged at a height substantially equal to the height of the center of gravity G (in other words, of the one coil spring 55 in the state of being arranged in the steering wheel). If the height of the center of gravity G is arranged from the upper end or the lower end to a range of about 50% of the length of the coil spring 55 in the vertical direction), the value of the rotational moment PL described above can be reduced. It is possible to further reduce the operating load of the horn switch mechanism. Of course, if it exceeds the above range , the spring load must be increased in order to prevent unnecessary operation of the horn due to the swing of the airbag device, which makes it difficult to obtain the effect of the present invention.

[0060] Further, in the embodiment, the coil spring 55 is illustrated as the urging means, but a leaf spring may be used.

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] FIG. 1 is a cross-sectional view of a steering wheel showing a conventional example.

FIG. 2 is a cross-sectional view of a steering wheel according to an embodiment of the present invention, showing the II-II portion of FIG.

FIG. 3 is a cross-sectional view of the steering wheel of the same embodiment, showing the parts III-III of FIG.

FIG. 4 is a plan view of the same embodiment.

FIG. 5 is a plan view showing a support plate of a fixed side member used in the same embodiment.

FIG. 6 is an exploded perspective view of a switch configuration used in the same embodiment.

[Explanation of symbols] 1 21 ... Steering wheel body, 4 30 ... Airbag device, 10 40 ... Horn switch mechanism, 14 52 ... Fixed side contacts, 15 54 .. .Movable side contacts, 16/55 ... (Burning means) Coil spring, 31 ... Airbag, 33 ... Inflator, 34 ... Pad, 35 ... Bag holder, 36 ... Horizontal Plate part, 36a ... Insertion hole, 38 ... Connecting plate part, 42 ... Support plate, 44b ... Base body part, 45 ... Connection piece, G ... Center of gravity, H ... Switch configuration, W0 / W1 ... Steering wheel.