Reciprocation type electric shaver

1. A reciprocation type electric shaver having an outside blade unit detachable from a main body, the outside blade unit comprising:

a main blade configured by an outside blade having a plurality of blade holes and an inside blade which reciprocally moves in a longitudinal direction of the outside blade unit to contact an inner face of the outside blade;

a slit blade configured by a stationary blade having a substantially comb shape and a moving blade which reciprocally moves in the longitudinal direction to contact an inside face of the stationary blade such that the slit blade is configured to float up and down in a direction transverse to the reciprocation direction of the outside blade unit;

an outside blade holder to hold the main blade;

a coupling structure to couple the slit blade on the outside blade holder in the longitudinal direction capable of floating up and down; and

a retaining structure configured to engage the slit blade with the coupling structure on the outside blade holder in a lateral direction of the outside blade unit so as to prevent disengagement of the slit blade from the outside blade holder when the slit blade floats up and down with inclination, the retaining structure being defined by a pair of fitting recesses provided on the slit blade and a pair of fitting protrusions provided on the coupling structure and protruding in the lateral direction facing each other, and the pair of fitting protrusions of the coupling structure configured to engage the pair of fitting processes of the slit blade in a plane defined by the longitudinal direction and the lateral direction.

2. The reciprocation type electric shaver in accordance with claim 1 , wherein the outside blade unit further comprises an attaching and detaching structure by which the outside blade holder is attachable to the outside blade unit and detachable from the outside blade unit by elastically deforming the outside blade holder.

3. The reciprocation type electric shaver in accordance with claim 1 , wherein the coupling structure comprises a hooking groove extending in the longitudinal direction on opposite inner faces of the outside blade holder, and the retaining structure comprises a hooking piece located at each longitudinal side of the slit blade to engage with the hooking groove in the heightwise direction; and the fitting recesses are located on both sides of the hooking piece.

4. The reciprocation type electric shaver in accordance with claim 1 , wherein a pair of spring support bosses are provided on the outside blade holder to support floating springs which urge the slit blade upward to enable the floating.

5. The reciprocation type electric shaver in accordance with claim 3 , wherein the outside blade of the main blade is held on an inside blade holder and the inside blade holder is positioned in the outside blade holder adjacent the hooking groove to reduce ratting of the slit blade.

6. The reciprocation type electric shaver in accordance with claim 1 , wherein a protrusion is formed on the slit blade to prevent rattling of the slit blade with respect to the outside blade holder.

7. The reciprocation type electric shaver in accordance with claim 4 , wherein a pair of holes is provided on the outside blade holder adjacent the spring support bosses to prevent debris from piling up at the slit blade.