handle

Abstract

To provide a steering wheel in which a coating film-like sensor layer for detecting gripping and a terminal can be stably connected.SOLUTION: In a steering wheel W, a sensor layer 13 formed of a coating film containing a conductive material is disposed on the front side of a soft coating layer 10 disposed around a metal core, so that gripping during steering can be detected. The sensor layer 13 allows the connection of a terminal 40 of a lead wire 36 electrically continuous with a gripping detection circuit. The coating layer 10 includes an insertion recess part 20 which is formed by extending the sensor layer 13 to an inner peripheral surface 21 side, and in which the terminal 40 can be inserted. The terminal 40 is inserted in the insertion recess part 20 filled with a conductive adhesive 48, thereby being connected to the sensor layer 13.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a steering wheel having a sensor layer that can detect a driver's grip at a location where the driver grips the steering wheel when steering the steering wheel. [Background technology]

[0002] Conventionally, in this type of steering wheel, a sensor layer made of a sheet-like conductive material capable of detecting gripping by an increase in electrostatic capacitance is arranged in the gripping portion that is gripped when steering (see, for example, Patent Document 1). The sensor layer is arranged on the surface side of the gripping portion of the steering wheel, and terminals of lead wires extending from a grip detection circuit that detects gripping are riveted in place. The sensor layer is arranged by, for example, adhering to the surface side of the coating layer around the core metal of the gripping portion of the steering wheel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-63761 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the sensor layer for detecting the grip is arranged on the surface of the coating layer around the core metal like a thin coating, even if a terminal is arranged on the surface side of the sensor layer, there is no space on the back side of the sensor layer to expand the diameter of the tip side of the rivet that has been penetrated and riveted the terminal to the sensor layer, so that the coating-like sensor layer and the terminal cannot be smoothly connected. In this case, it is possible to fasten the terminal by penetrating a fastening means such as a rivet or a screw so as to penetrate the coating layer and the core metal with the terminal placed on the front side of the sensor layer. However, even in this case, if the sensor layer is arranged on the front side of the coating layer and the head of the rivet or screw presses the sensor layer against the coating layer during fastening, there is a risk that the part of the sensor layer that contacts the terminal will cause a crack such as a break due to the elastic deformation of the coating layer on the back side of the sensor layer, and the terminal cannot be stably connected to the sensor layer, making it difficult to ensure a stable conductive state between the sensor layer and the terminal. In particular, the coating layer that covers the core wire is usually made of a soft material such as urethane foam, and since the elastic deformation of the coating layer is large, the portion of the sensor layer that comes into contact with the terminal can be broken or otherwise damaged due to the elastic deformation of the coating layer, making it impossible to stably connect the terminal to the sensor layer.

[0005] The present invention is devised to solve the above-mentioned problems, and has an object to provide a handle that can stably connect a coating-like sensor layer for grip detection to a terminal. [Means for solving the problem]

[0006] In the steering wheel according to the present invention, a sensor layer made of a coating film containing a conductive material is disposed on the surface side of a soft coating layer disposed around a core metal so as to be capable of detecting gripping of the steering wheel when the steering wheel is steered. The sensor layer is a handle for connecting a terminal of a lead wire that is connected to a grip detection circuit for detecting a grip, the covering layer has an insertion recess into which the terminal can be inserted by extending the sensor layer toward an inner circumferential surface side, The terminal is inserted into the insertion recess filled with a conductive adhesive and connected to the sensor layer.

[0007] In the handle according to the present invention, if the terminal of the lead wire that is conductive to the grip detection circuit is inserted into the insertion recess in which the sensor layer in the coating layer is extended to the inner peripheral surface side, the terminal can be attached and disposed in the insertion recess by the conductive adhesive filled in the insertion recess. The terminal inserted into the insertion recess can ensure electrical continuity by the conductive adhesive even if it is not in direct contact with the sensor layer that is extended to the inner peripheral surface side of the insertion recess. In addition, the sensor layer does not compress the portion that is in electrical continuity with the terminal by the fastening force of a conventional fastening means such as a rivet or a screw, but is simply configured to extend into the insertion recess, so there is no risk of breakage and electrical continuity with the terminal can be stably ensured.

[0008] Therefore, in the handle of the present invention, the coating-like sensor layer for grip detection can be stably connected to the terminals. Also, the connection between the sensor layer and the terminals can be easily performed by simply inserting the terminals into the insertion recess filled with the conductive adhesive.

[0009] In the handle according to the present invention, the insertion recess may have a shape with an inner diameter larger than that of the insertion opening into which the terminal is fitted.

[0010] In this configuration, the hardened conductive adhesive within the insertion recess is joined to the terminal and engaged with the inner edge of the insertion opening of the insertion recess, thereby preventing the terminal from coming out of the insertion recess and improving the connection strength between the terminal and the sensor layer.

[0011] In this case, if the terminal is configured with an enlarged portion, which is enlarged in diameter from the tip portion, in the intermediate portion between the tip portion and the base portion so that it can be engaged with the inner peripheral edge of the insertion port, the terminal is further prevented from coming off the insertion recess.

[0012] It is desirable for a terminal having such an enlarged portion to be constructed from an expandable rivet or screw. In the case of such a configuration, the enlarged portion can be inserted without expanding the outer dimensions before insertion into the insertion recess, making it easier to insert into the insertion recess.

[0013] In the handle according to the present invention, the sensor layer is The mold coating agent may be formed from a urethane-based paint containing a conductive material, and may be disposed on the surface side of the coating layer when the coating layer is molded.

[0014] In this configuration, the sensor layer formed as a coating film is a mold coat layer (in-mold coat layer), and the mold coating agent made of a urethane-based paint containing a conductive material is applied in advance to the mold surface of the mold used to mold the coating layer, and then the coating layer is simply molded to easily form the coating layer provided with the sensor layer. Furthermore, as a comparative example, for example, in a case where the sensor layer is not made into a mold coat layer, but a urethane-based paint containing a conductive material for forming the sensor layer is applied to the outer surface side of the coating layer after molding and then cured to form the sensor layer, a primer is applied to the outer surface of the coating layer after molding, or a drying process after applying the urethane-based paint is required. Compared to this case, the handle provided with the sensor layer made of the mold coat layer of the present invention can be easily manufactured because the primer application process and drying process described above are not required. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a schematic plan view showing a handle of one embodiment of the present invention. [Diagram 2] 2 is a schematic cross-sectional view of a gripping portion of the handle of the embodiment, which corresponds to the portion II-II in FIG. 1. [Diagram 3] 1A to 1C are diagrams illustrating a manufacturing process of the handle according to the embodiment. [Figure 4] 5A to 5C are diagrams for explaining the manufacturing process of the handle according to the embodiment, showing the state after FIG. 3. [Diagram 5] 2 is a schematic cross-sectional view of a portion of the handle in the embodiment where a terminal is provided, the portion corresponding to the portion VV in FIG. 1. [Figure 6]13 is a schematic cross-sectional view of a terminal arrangement portion in a modified example of the embodiment. FIG. [Figure 7] FIG. 11 is a schematic cross-sectional view of a terminal arrangement portion in another modified example of the embodiment. [Figure 8] FIG. 11 is a schematic cross-sectional view of a terminal arrangement portion in yet another modified example of the embodiment. [Figure 9] FIG. 11 is a schematic cross-sectional view of a terminal arrangement portion in yet another modified example of the embodiment. [Figure 10] FIG. 11 is a schematic cross-sectional view of a terminal arrangement portion in yet another modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of the present invention will be described below with reference to the drawings. As shown in Figures 1 and 2, a handle W of the embodiment is configured to include a substantially annular grip portion R to be gripped when steering a vehicle (not shown), a boss portion B at the center of the grip portion R, and spoke portions S (L, R, B) connecting the grip portion R and the boss portion B. The spoke portion S includes spoke portions SL, SR extending from the boss portion B to both the left and right sides, and a spoke portion SB extending rearward from the boss portion B. The handle W is also configured to include an airbag device 70, indicated by a two-dot chain line, disposed on the upper side of the boss portion B, a handle body H, and a lower cover 72 covering the lower side of the boss portion B.

[0017] The airbag device 70 and the lower cover 72 have substantially the same external shape when viewed from above, with the airbag device 70 disposed above and the lower cover 72 disposed below the steering wheel main body H. The airbag device 70 is attached to the steering wheel main body H by engaging a plurality of mounting legs (not shown) with corresponding engaging holes 9 of the steering wheel main body H. The lower cover 72 is made of a synthetic resin such as polypropylene, and is attached to the steering wheel main body H with predetermined screws.

[0018] The handle body H is configured with a grip portion R, a boss portion B, and a core metal 3 made of a metal material such as an aluminum alloy that connects the spoke portions S. The core metal 3 is configured with a grip core metal portion 4 disposed in the grip portion R, a boss core metal portion 5 disposed in the boss portion B, and spoke core metal portions 6 (L, R), 7 disposed in the spoke portions S (L, R, B) so as to connect the grip core metal portion 4 and the boss core metal portion 5. The boss core metal portion 5 has a steel boss 5a disposed thereon that is connected to the steering shaft of the vehicle. The spoke core metal portion 6 is configured with spoke core metal portions 6L, 6R disposed in the left and right spoke portions SL, SR, and two spoke core metal portions 7, 7 disposed in the rear spoke portion SB, branching to the left and right at the boss core metal portion 5 side and connected to the grip core metal portion 4 side.

[0019] A grip detection circuit 35 is disposed in the boss portion B at a portion of the steering wheel main body H covered by the airbag device 70. Lead wires 36 extending from a sensor layer 13 described below are connected to the grip detection circuit 35, and when the driver's hand approaches the sensor layer 13 of the grip portion R as if gripping the grip portion R, the capacitance increases, and the grip detection circuit 35 detects the increase and detects the driver's grip.

[0020] 2, the gripping part R is composed of a gripping core bar portion 4 of the core bar 3, a covering layer 10 made of urethane foam formed by molding so as to cover the periphery of the gripping core bar portion 4, a sensor layer 13 disposed on the surface of the covering layer 10, and a protective layer 16 disposed on the surface side of the sensor layer 13. In the areas of the left and right spoke parts SL, SR covered by the airbag device 70, the protective layer 16 does not cover the sensor layer 13 in areas away from the gripping core bar portion 4, leaving the sensor layer 13 exposed.

[0021] The sensor layer 13 is formed from a mold coating agent 58 made of a urethane-based paint containing a conductive material (a urethane-based paint mixed with conductive carbon, metal oxide powder, etc. as a conductive filler) (see Figure 3), and is configured as a coating film that is applied to the mold surfaces 51a, 52a of the coating layer 10 during molding, and is disposed on the surface side of the coating layer 10 when the coating layer 10 is molded.

[0022] In this embodiment, the sensor layer 13 is formed from a urethane paint containing conductive carbon.

[0023] In this embodiment, the protective layer 16 is provided as a skin layer made of urethane foam that is provided by molding.

[0024] That is, in the embodiment, the urethane foam is composed of a urethane layer as a covering layer 10 on the gripping core portion 4 side on the back side of the sensor layer 13, and a urethane layer as a protective layer 16 on the front side of the sensor layer 13.

[0025] In this embodiment, the sensor layer 13 is made of a urethane-based paint containing conductive carbon, and the surface of the coating layer 10 is covered in a dark black color, while the protective layer 167 is not black, but is formed using urethane foam containing a light beige pigment to enhance the design.

[0026] In this embodiment, the thickness dimension St1 of the sensor layer 13 is set to 20 μm within a range of approximately 5 to 50 μm, preferably 10 to 30 μm, taking into consideration the conductivity, durability, and feel, and the thickness dimension Ut1 of the urethane layer of the protective layer 16 is set to 2 mm within a range of approximately 1 to 3 mm, taking into consideration the durability, feel, and sensitivity of the sensor layer 13.

[0027] As shown in FIG. 5, the lead wire 36 is connected to the sensor layer 13 by inserting a terminal 40 connected to the tip of the lead wire 36 into an insertion recess 20 filled with a conductive adhesive 48.

[0028] The terminal 40 is a cylindrical member made of conductive metal, and the lead wire 36 is connected to the terminal 40 by soldering.

[0029] The location of the terminal 40, in other words the connection portion between the lead wire 36 and the sensor layer 13, is located away from the area gripped by the driver and is covered by the airbag device 70 or other switches on the steering wheel W, and is therefore located at a position not visible to the driver. In this embodiment, the terminal 40 is located in a portion of the covering layer 10 that covers the spoke core portion 6R, which is the portion covered by the airbag device 70.

[0030] The insertion recess 20 into which the terminal 40 is inserted is disposed in a portion of the covering layer 10 that covers the spoke core metal portion 6R, and is formed by extending the sensor layer 13 toward the inner circumferential surface 21. In the case of this embodiment, the inside of the middle portion 26 extending from the insertion opening 22 into which the terminal 40 is fitted toward the bottom portion 24 is formed into a shape that expands in diameter into a substantially spherical shape. The sensor layer 13 on the outer circumferential surface 10a side of the covering layer 10 that covers the spoke core metal portion 6R is extended onto the inner circumferential surface 21 of the insertion recess 20. In other words, the extension portion 14 of the sensor layer 13 is disposed over the entire surface of the inner circumferential surface 21.

[0031] The conductive adhesive 48 is formed by dispersing conductive fillers such as silver, copper, and carbon having electrical conductivity in an organic binder such as an epoxy-based or phenol-based adhesive.

[0032] The connection of the terminal 40 with the sensor layer 13 is performed by inserting the terminal 40, to which the lead wire 36 is connected, into the insertion recess 20 filled with conductive adhesive 48, and hardening the conductive adhesive 48. The hardened conductive adhesive 48 is also provided on the periphery 30 of the insertion opening 22 on the outer surface 13a side of the sensor layer 13 of the insertion opening 22, and the terminal 40 is electrically connected to the sensor layer 13 by utilizing the filling portion 48a filled in the insertion recess 20 and the outflow portion 48b provided on the insertion opening periphery 30.

[0033] The handle body H of the embodiment is manufactured through a mold coating agent application step, a first urethane layer forming step as the covering layer 10, and a second urethane layer forming step as the protective layer 16.

[0034] 3A and 3B, in the mold coating agent application step, a urethane-based paint containing a conductive material for forming the sensor layer 13 is applied as mold coating agent 58 to mold surfaces 51a and 52a of split molds 51 and 52 of a mold 50 for forming a first urethane layer as the coating layer 10, by a spray gun 57 as an application device. Note that, before applying the mold coating agent 58, a release agent is applied to the mold surfaces 51a and 52a.

[0035] Next, as shown in Figures 3C and 3D as the process for molding the first urethane layer as the coating layer 10, a molding die 50 consisting of split dies 51 and 52 is clamped, and a urethane material for forming the coating layer 10 as the first urethane layer is injected into the cavity 50a and hardened, producing an intermediate molded product 53 forming the coating layer 10, and the molding die 50 is opened to remove the intermediate molded product 53.

[0036] Next, as a molding process of the second urethane layer as the protective layer 16, as shown in Fig. 4A and 4B, a mold 54 consisting of split molds 55 and 56 for molding the second urethane layer is opened, the intermediate molded product 53 is set, and the mold 54 is closed. As shown in Fig. 4B and 4C, a urethane material for molding the second urethane layer as the protective layer 16 is injected into the cavity 54a and hardened to mold the second urethane layer 16. Before molding, a mold release agent is applied to the mold surfaces 55a and 56a of the split molds 55 and 56. After molding the second urethane layer as the protective layer 16, the mold is opened and removed to obtain a molded product provided with a grip portion R, i.e., a handle body H.

[0037] During manufacturing (molding) of the handle body H, the covering layer 10 is formed with an insertion recess 20 in which the extension 14 of the sensor layer 13 is provided.

[0038] In the steering wheel main body H manufactured in this manner, the grip detection circuit 35 and the like are assembled in the arrangement area of ​​the boss portion B, and as described above, the terminal 40 to which the lead wire 36 is connected is inserted into the insertion recess 20 filled with the conductive adhesive 48, and the terminal 40 is adhered to the sensor layer 13. Then, while attaching the lower cover 72 to the lower side of the boss portion B, the boss 5a of the boss portion B is fastened to the steering shaft of the vehicle, and the airbag device 70 is attached to the upper side of the boss portion B while connecting the lead wires for inputting the activation signal of the airbag device 70 and various lead wires to be connected to the grip detection circuit 35 and the like to the vehicle side, and the airbag device 70 can be attached to the upper side of the boss portion B, and the steering wheel W can be assembled and mounted on the vehicle.

[0039] In a steering wheel W mounted on a vehicle, when the driver's hand approaches the sensor layer 13 of the grip portion R as if to grip the grip portion R, a specified grip detection circuit 35 detects an increase in capacitance, thereby detecting the driver's grip.

[0040] In the handle W of the embodiment, if the terminal 40 of the lead wire 36 that is electrically connected to the grip detection circuit 35 is inserted into the insertion recess 20 in which the sensor layer 13 in the coating layer 10 is extended to the inner peripheral surface 21 side, the terminal 40 can be attached and disposed in the insertion recess 20 by the conductive adhesive 48 filled in the insertion recess 20. The terminal 40 inserted into the insertion recess 20 can ensure electrical continuity through the conductive adhesive 48 even if it is not in direct contact with the sensor layer 13 that is extended to the inner peripheral surface 21 side of the insertion recess 20. In addition, the sensor layer 13 does not compress the portion that is electrically connected to the terminal 40 by the fastening force of a conventional fastening means such as a rivet or a screw, but simply extends into the insertion recess 20, so there is no risk of breakage and electrical continuity with the terminal 40 can be stably ensured.

[0041] Therefore, the handle W of the embodiment can stably connect the coating-like sensor layer 13 for grip detection to the terminal 40. Also, the connection between the sensor layer 13 and the terminal 40 can be easily performed by simply inserting the terminal 40 into the insertion recess 20 filled with the conductive adhesive 48.

[0042] In addition, in the handle W of the embodiment, the sensor layer 13 is formed from a mold coating agent 58 made of a urethane-based paint containing a conductive material, and is configured to be disposed on the surface (outer surface) 10a side of the coating layer 10 when the coating layer 10 is molded (see Figures 2 and 3).

[0043] Therefore, in the embodiment, the sensor layer 13 formed as a coating film is a mold coat layer (in-mold coat layer) 59, and a mold coat agent 58 made of a urethane-based paint containing a conductive material is applied in advance to the mold surfaces 51a, 52a of the mold 50 when the coating layer 10 is molded, and the coating layer 10 provided with the sensor layer 13 can be formed by simply molding the coating layer 10. Furthermore, as a comparative example, for example, in a case where the sensor layer is not made into a mold coat layer, but a urethane-based paint containing a conductive material for forming the sensor layer is applied to the outer surface 10a side of the coating layer 10 after molding and then cured to form the sensor layer, a primer is applied to the outer surface of the coating layer after molding, or a labor for drying after applying the urethane-based paint is required. Compared to this case, the handle W provided with the sensor layer 13 made of the mold coat layer of the embodiment can be easily manufactured because the above-mentioned primer application process and drying process are not required.

[0044] Of course, if the above points are not taken into consideration, the sensor layer may not be a mold coat layer, but may be formed by applying a urethane-based paint containing a conductive material for forming the sensor layer to the outer surface side of the molded covering layer and then curing it.

[0045] In the handle W of the embodiment, the insertion recess 20 has a shape with an inner diameter larger than that of the insertion opening 22 into which the terminal 40 is fitted.

[0046] Therefore, in the embodiment, the filling portion 48a of the conductive adhesive 48 hardened within the insertion recess 20 is configured to be engaged with the inner edge 28 of the insertion opening 22 of the insertion recess 20 while being joined to the terminal 40, thereby preventing the terminal 40 from coming off the insertion recess 20 and improving the connection strength between the terminal 40 and the sensor layer 13.

[0047] 6, the insertion recess 20A may simply be a cylindrical recess, and the terminal 40A may be bonded to the extension portion 14 of the sensor layer 13 and electrically connected only by the adhesive force of the conductive adhesive 48. The terminal 40A has the lead wire 36 soldered to the upper surface of a disk-shaped head 41, and the shaft portion 42 extending cylindrically from the head 41 is inserted into the insertion recess 20A.

[0048] Furthermore, as shown in FIG. 7, when the insertion recess 20B has a shape with an inner diameter larger than the insertion opening 22 into which the terminal 40B is fitted, an expanded diameter portion 45 with a larger diameter than the tip portion 44 may be provided in the intermediate portion between the tip portion 44 and the base portion 43 of the shaft portion 42B extending from the head 41B so that the terminal 40B can be engaged with the inner peripheral edge 28 of the insertion opening 22.

[0049] In this configuration, the enlarged diameter portion 45 is engaged with the inner peripheral edge 28 of the insertion opening 22, which further prevents the terminal 40B from coming off the insertion recess 20B.

[0050] A terminal having such an expanded diameter portion may be formed of an expansion rivet or screw, as shown in Figs.

[0051] That is, the terminal 40C shown in Figure 8 is an expansion rivet type, and an expansion piece 46 that is in a closed state is arranged around the shaft portion 42C extending from the head 41C before the head 41C side is pushed in. After insertion into the recess 20C, when the head 41C side is pushed in, the expansion piece 46 opens like an umbrella to form an expanded diameter portion 45C with an expanded external dimension.

[0052] 9 is an expansion screw type terminal, and an expansion member 47 is engaged with a shaft portion 42D having a male screw thread extending from a head portion 41D. The head portion 41D is composed of a head body 41a connected to the shaft portion 42D, and an annular flange portion 41b through which the lead wire 36 is connected and the shaft portion 42D is inserted. The expansion member 47 is composed of a base portion 47a through which the shaft portion 42D on the head 41D side is inserted, a tip portion 47b screwed into the shaft portion 42D, and a curved deformation portion 47c connected to the base portion 47a and the tip portion 47b. The deformation portion 47c constitutes the enlarged diameter portion 45D, and when the head body 41a is rotated to rotate the shaft portion 42D having a male screw thread in a predetermined direction, the tip portion 47b moves away from the head body 41a so as to narrow the outer dimensions of the deformation portions 47c on both sides. With this enlarged diameter portion 45D in a closed state, the shaft portion 42D is inserted into the insertion recess 20D filled with conductive adhesive 48, and after insertion, the head body 41a and the shaft portion 42D are rotated in a predetermined direction to bring the tip portion 47b closer to the base portion 47a, causing the deformation portions 47c on both sides to expand the outer dimensions, so that the enlarged diameter portion 45D consisting of the deformation portions 47c can engage with the inner peripheral edge 28 of the insertion opening 22 in the insertion recess 20D.

[0053] In the embodiment, the terminal 40 is disposed in a portion where the protective layer 16 is not provided, but if the area is hidden from the driver's side by the airbag device 70, a switch cover, or a lower cover, as shown in Fig. 10, the terminal 40E having the lead wire 36 connected thereto may be inserted into an insertion recess 20E filled with a conductive adhesive 48 so as to be connected to the sensor layer 13 in the area where the protective layer 16 is provided. The terminal 40E is configured by providing a head 41E having the lead wire 36 connected thereto and a shaft 42E extending from the head 41E and inserted into the insertion recess 20E. [Explanation of symbols]

[0054] 3...core, 6L...spoke core portion, 10...coating layer, 13...sensor layer, 14...extension portion, 20, 20A, 20B, 20C, 20D, 20E...insertion recess, 22...insertion port, 35...grip detection circuit, 36...lead wire, 40, 40A, 40B, 40C, 40D, 40E...terminal, 45, 45C, 45D...expanded portion, 48...conductive adhesive, 58...mold coating material, W...handle.

Claims

1. A sensor layer made of a coating film containing a conductive material is disposed on a surface side of a soft coating layer disposed around a core metal so that the gripping of the steering wheel during steering can be detected. The sensor layer is a handle for connecting a terminal of a lead wire that is connected to a grip detection circuit for detecting a grip, the covering layer has an insertion recess into which the terminal can be inserted by extending the sensor layer toward an inner circumferential surface side, The handle is characterized in that the terminal is inserted into the insertion recess filled with a conductive adhesive and connected to the sensor layer.

2. 2. The handle according to claim 1, wherein the insertion recess has an inner diameter larger than that of the insertion opening into which the terminal is fitted.

3. The handle as described in claim 2, characterized in that the terminal is configured to have an enlarged diameter portion, which is enlarged in diameter from the tip portion, in an intermediate portion between the tip portion and the base portion so that it can be engaged with the inner peripheral edge of the insertion port.

4. 4. The handle of claim 3, wherein the terminal comprises an expansion rivet or screw.

5. The sensor layer comprises: The handle according to any one of claims 1 to 4, characterized in that it is formed from a mold coating agent consisting of a urethane-based paint containing a conductive material, and is arranged on the surface side of the coating layer when the coating layer is molded.

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