Patent ID: 8746760

Claim:
A handle-returning device adapted to return a handle of a cylinder lock assembly after the handle is rotated, comprising: a support base having an annular base wall, an inner annular flange projecting axially from an inner periphery of said annular base wall and defining a central hole, and at least one spring-retaining lug projecting axially from said annular base wall; a rotation driver including an annular plate spaced axially from said annular base wall, an inner tubular wall extending axially from an inner periphery of said annular plate into said central hole of said support base, at least one spring driving element formed on said annular plate and aligned radially with said at least one spring-retaining lug, and at least one tongue projecting axially from said inner tubular wall and extending through said central hole of said support base; a torsion spring disposed around said inner annular flange and between said annular base wall and said annular plate, and having at least one spring leg abutting against said at least one spring-retaining lug and said at least one spring driving element; and a rotary plate disposed in abutment with a surface of said annular base will of said support base opposite to said annular plate, and having at least one engaging part proximate to said central hole of said support base to engage said at least one tongue of said rotation driver, wherein said at least one engaging part is in the form of at least one engaging hole formed in said rotary plate to engage an end of said at least one tongue, and wherein said rotary plate further has a central hole aligned with said central hole of said support base, and a finger plate projecting radially and inwardly from an inner periphery of said rotary plate, said rotation driver further having a finger plate projecting radially from said inner tubular wall and aligned axially with said finger plate of said rotary plate.