Patent ID: 6997038
Filing Date: 2006-02-14
Classification: G01N

Abstract:
1. A gas sensor comprising: a hollow cylindrical housing having an open end in which a groove is formed; a sensor element disposed within said housing, said sensor element having a sensing portion projecting from the open end of said housing; a cover assembly made up of an outer cylindrical cover and an inner cylindrical cover each of which includes an open end portion and a body portion, the body portion of the inner cylindrical cover being disposed within the body portion of the outer cylindrical cover in a non-contact fashion, the open end portions of the outer and inner cylindrical covers having outwardly extending shoulders, respectively, which are placed in contact with each other and fitted within the groove of said housing; and an extension formed around the groove of said housing, said extension being bent to urge the shoulders of the outer and inner cylindrical covers into engagement with each other to install said cover assembly on said housing, wherein said extension is welded to the shoulders of the inner and outer cylindrical covers so that a tip of the weld lies within a thickness of the shoulder of the inner cylindrical cover.