Abstract: An alighting assistance device D of the present disclosure may be a device moving a driver seat rearward in a case where a determination may be made that an occupant seated on the driver seat of a vehicle alights. The device may include a height changer which changes a height of a steering wheel, a sitting height acquirer which acquires a sitting height of the occupant, and a steering wheel controller 33 as one example of a height controller which controls the height changer such that the height of the steering wheel becomes lower as the sitting height acquired by the sitting height acquirer may be higher in the case where a determination is made that the occupant alights.

Abstract: A method for manufacturing a spark plug, the spark plug includes: a cylindrical metal shell having a portion to be caulked and a tool-engaging portion that is to be attached on an engine; an insulator that is inserted into the metal shell and extends axially; and a caulking metallic mold, the method including caulking the portion to be caulked to be fixed to an outer circumferential face of the insulator with the caulking metallic mold, where in the caulking metallic mold includes a face, the face including a hard carbon film that includes an amorphous carbon phase, and the face is contact with or sliding to the portion to be caulked.

Abstract: A metal member 55 (with a zinc plating layer 56 for prevention of corrosion) having a sliding expected surface that is expected to slide with the other member is immersed into a chromating bath containing a mixture of trivalent chromium salt and a complexing agent for trivalent chromium. And a chromate coat 57 having a film thickness of 0.2 to 0.5 &mgr;m and composed of trivalent chromium at 95 mass % or more of chromium component contained is formed at least on the sliding expected surface. Thereinafter, its chromate coat 57 is subjected to the heat treatment at temperatures from 85 to 255° C., thereby enhancing the sliding property of the chromate coat 57. As a result, the metal member 55 with chromate coat can be easily slid with the other member.

Abstract: A method for manufacturing a spark plug, the spark plug comprises: a cylindrical metal shell having a portion to be caulked and a tool-engaging portion that is to be attached on an engine; an insulator that is inserted into the metal shell and extends axially; and a caulking metallic mold, the method comprising caulking the portion to be caulked to be fixed to an outer circumferential face of the insulator with the caulking metallic mold, wherein the caulking metallic mold comprises a face, the face comprising a hard carbon film that comprises an amorphous carbon phase, and the face is contact with or sliding to the portion to be caulked.

Abstract: A metal member 55 (with a zinc plating layer 56 for prevention of corrosion) having a sliding expected surface that is expected to slide with the other member is immersed into a chromating bath containing a mixture of trivalent chromium salt and a complexing agent for trivalent chromium. And a chromate coat 57 having a film thickness of 0.2 to 0.5 &mgr;m and composed of trivalent chromium at 95 mass % or more of chromium component contained is formed at least on the sliding expected surface. Thereinafter, its chromate coat 57 is subjected to the heat treatment at temperatures from 85 to 255° C., thereby enhancing the sliding property of the chromate coat 57. As a result, the metal member 55 with chromate coat can be easily slid with the other member.