Knife

A knife comprising a liner including a pair of parallel walls spaced apart along a transverse axis, means defining a pair of bearing surfaces in said walls and in alignment on said axis, a hub extending along said axis and abutting both of said bearing surfaces, a blade disposed between said walls, means defining a bearing surface in said blade and abutting said hub, means defining a first notch in said hub extending radially of said axis and extending axially the length of the hub between said bearing surfaces including at least partly through one of said walls, means defining a second notch in said one of said walls radially longer than said first notch and adapted to register radially of said axis with said first notch, means defining a third notch in said blade radially at least as long as said second notch and adapted to register radially of said axis with said first notch and said second notch, a detent, means for mounting said detent for axial movement relative to said hub, a key projecting radially from said detent, riding in and projecting beyond said first notch and having a radial length to extend into each of said second and third notches, the portion of said key projecting beyond said first notch having an axial extent effective in a first axial position of said detent to lie wholly within said third notch, and means for resiliently urging said detent out of said first position and toward a second axial position with said portion of said key lying partly in said third notch and partly in said second notch.