Hair clipper

In a hair clipper comprising:

• a housing having a rearward end and an opposed forward end with a cutter head including a stationary blade with a toothed leading edge and a movable blade with a toothed leading edge mounted for reciprocation in a reciprocation direction with said toothed edges overlapping in a hair shearing relation;
• said stationary blade having an outer scalp engaging surface and an inner surface facing toward said movable blade;
• the outer surface of said stationary blade along its leading edge being included relative to said inner surface so as to produce a shorter length of hairs which is cut when there is a lesser amount of overlap in said hair shearing relationship;
• at least one of said stationary blade and said movable blade being a longitudinally movable blade mounted for movement along a longitudinal axis extending in a direction generally perpendicular to said reciprocation direction so as to adjust a cut length of hairs sheared between said blades;
• characterized in that an adjustor handle is mounted on said housing for rotational movement about said longitudinal axis, and that linkage means is disposed between said longitudinally movable blade and said adjustor handle for moving said longitudinally movable blade to increase and decrease said length of hairs which is cut when said adjustor handle is rotated about said longitudinal axis;
• said linkage means comprising a linkage element extending along said longitudinal axis to have a first end and a second end;
• said linkage element coupled at said first end to said longitudinally movable blade to be movable together therewith along said longitudinal axis, said linkage element formed at said second end with a protection for engagement into a corresponding groove formed in said adjustor handle;
• said groove extending in an interior surface of said adjustor handle in an inclined manner with respect to a circumferential direction to have front and rear ends spaced circumferentially and longitudinally, said groove formed along its length with a plurality of Slope edges alternated by level edges for sliding contact with said projection,
• said level edges running in a direction perpendicular to said longitudinal axis such that said longitudinally movable blade is moved longitudinally in a stepwise manner upon rotation of said adjustor handle and such that said longitudinally movable blade is kept at predetermined longitudinal positions while said projection is in contact with said level edges.