Handle-returning device for a cylinder lock assembly

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 at least one spring-retaining lug projecting axially from said annular base wall;
• a rotation driver including an annular plate, an inner tubular wall extending axially from an inner periphery of said annular plate into said inner annular flange of said support base, and at least one spring driving element extending axially from an outer periphery of said annular plate;
• a torsion spring disposed around said inner annular flange and between said annular base wall of said support base and said annular plate of said rotation driver, and having at least one spring leg abutting against said spring-retaining lug and said spring driving element;
• and
• a cover plate covering a surface of said annular plate of said rotation driver opposite to said annular base wall and having an interlocking part to engage said annular base wall.

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, an outer annular flange projecting axially from an outer periphery of said annular base wall, said annular base wall being stepped and having a first annular section connected to said inner annular flange, a second annular section connected to said outer annular flange, a third annular section interconnecting and extending transversely of said first and second annular sections, a pair of annularly spaced apart spring-retaining lugs projecting axially from said first annular section;
• a rotation driver adapted to be rotated through an operation of the lever handle, and including an annular plate, an inner tubular wall extending axially from an inner periphery of said annular plate into said central hole of said support base, and a pair of spring driving elements projecting from an outer periphery of said annular plate and aligned radially and respectively with said spring-retaining lugs;
• and
• a torsion spring disposed around said inner annular flange and between said first annular section and said annular plate, and having a pair of spring legs each abutting against one of said spring-retaining lugs and one of said spring driving elements.