Abstract: A gas sensor comprising: the gas sensor element defined; the cylindrical metal shell defined herein; and the protector defined herein, wherein the protector defined herein has a double structure including the cylindrical inner cover portion and the outer cover portion both defined herein, and a leading end portion positioned on a leading end side of the support face of the metal shell, the outer cylindrical portion and the inner cylindrical portion are arranged to construct an inner gas introducing passage for guiding the object gas introduced from the outer gas introducing apertures, between the outer cylindrical portion and the inner cylindrical portion, across a trailing end of the inner cylindrical portion closer to a leading end side, as viewed in an axial direction, than an inner circumferential side end edge of a joining face joining an inner circumference and an outer circumference of a leading end portion of said metal shell, into a clearance between the inner cover portion and the leading end portio

Abstract: A method of producing a gas sensor is provided. The method includes a disposition step of preparing an elastic seal member having a main body portion and a smaller diameter portion that is smaller in outer diameter than the main body portion, disposing the entire main body portion and a part of the smaller diameter portion inside a tubular metallic member and allowing a remaining part of the smaller diameter portion to protrude outward from a rear end of the tubular metallic member, and a crimping step of crimping at least a portion of the tubular metallic member radially inward and thereby compressively deforming the elastic seal member. A gas sensor is also provided.

Abstract: A method of producing a gas sensor is provided. The method includes a disposition step of preparing an elastic seal member having a main body portion and a smaller diameter portion that is smaller in outer diameter than the main body portion, disposing the entire main body portion and a part of the smaller diameter portion inside a tubular metallic member and allowing a remaining part of the smaller diameter portion to protrude outward from a rear end of the tubular metallic member, and a crimping step of crimping at least a portion of the tubular metallic member radially inward and thereby compressively deforming the elastic seal member. A gas sensor is also provided.

Abstract: A gas sensor comprising: a gas sensor element extending in an axial direction; a cylindrical metal shell enclosing said gas sensor element such that a leading end portion of said gas sensor element protrudes from its own leading end; and a protector fixed on said metal shell and covering said leading end portion of said gas sensor element, wherein said protector includes: a cylindrical outer cover portion fixed on said metal shell and having gas introducing apertures; and a cylindrical inner cover portion arranged on an inner side of said outer cover portion and having elastic portions being capable of being elastically deformed by a pushing force acting in an axial direction, and said inner cover portion is so clamped between said metal shell and said outer cover portion that said elastic portions are elastically deformed by said axial pushing force.

Abstract: A gas sensor comprising: the gas sensor element defined; the cylindrical metal shell defined herein; and the protector defined herein, wherein the protector defined herein has a double structure including the cylindrical inner cover portion and the outer cover portion both defined herein, and a leading end portion positioned on a leading end side of the support face of the metal shell, the outer cylindrical portion and the inner cylindrical portion are arranged to construct an inner gas introducing passage for guiding the object gas introduced from the outer gas introducing apertures, between the outer cylindrical portion and the inner cylindrical portion, across a trailing end of the inner cylindrical portion closer to a leading end side, as viewed in an axial direction, than an inner circumferential side end edge of a joining face joining an inner circumference and an outer circumference of a leading end portion of said metal shell, into a clearance between the inner cover portion and the leading end portio

Abstract: A gas sensor comprising: a gas sensor element extending in an axial direction; a cylindrical metal shell enclosing said gas sensor element such that a leading end portion of said gas sensor element protrudes from its own leading end; and, a protector fixed on said metal shell and covering said leading end portion of said gas sensor element, wherein said protector includes: a cylindrical outer cover portion fixed on said metal shell and having gas introducing apertures; and a cylindrical inner cover portion arranged on an inner side of said outer cover portion and having elastic portions being capable of being elastically deformed by a pushing force acting in an axial direction, and said inner cover portion is so clamped between said metal shell and said outer cover portion that said elastic portions are elastically deformed by said axial pushing force.

Abstract: A bending apparatus for a long material comprises: supporting device for supporting a long material in cantilever fashion at least in a bending direction; bending device which nips the material at an input point apart from the supporting device and is rotated by a predetermined angle so as to bend the material between the supporting device and the input point; driving device for rotating the bending device; feeding device for moving the material toward the bending device and setting a position of the material; and moving device which sets up a separation distance between the supporting device and the bending device prior to bending of the material and allows the supporting device and the bending device to move relatively during the bending of the material.

Abstract: A bending apparatus for a long material comprises: supporting device for supporting a long material in cantilever fashion at least in a bending direction; bending device which nips the material at an input point apart from the supporting device and is rotated by a predetermined angle so as to bend the material between the supporting device and the input point; driving device for rotating the bending device; feeding device for moving the material toward the bending device and setting a position of the material; and moving device which sets up a separation distance between the supporting device and the bending device prior to bending of the material and allows the supporting device and the bending device to move relatively during the bending of the material.

Abstract: A piezoelectric resonance type knock sensor that is highly responsive and easy to assemble, wherein a bulged round seat section (washer 7) arranged under the lower surface of a thin metal plate 5 and coaxally with a support bolt 9 in such a way that the outer diameter of the bulged round seat section exceeds the inner diameter of an annular piezoelectric element 5, the lower end of a resilient connector member 11a arranged between a rod-shaped output terminal 11 and the vibration sensing member 4 is resiliently held in contact with an upper electrode 5a of the annular piezoelectric element 5 at a position located inside the outer periphery of the bulged round seat section, and the resonance frequency of its vibration sensing member can be regulated very easily to make itself a highly responsive and effective knock sensor.