Electric tool
The electric tool includes a base having an opening portion and a bottom face; a blade being projected downward from the bottom face of the base through the opening portion of the base, the blade being capable of cutting while sliding the bottom face of the base on an upper face of a work piece; a motor driving the blade; a housing accommodating the motor. The bottom face of the base is at least partially coated with a resin including fluorine.
1. An electric tool, comprising:
a base configured by a metal plate, the metal plate including:
an opening portion;
a bottom face;
a front connector portion comprising one of an inclined surface and a curved surface; and
a front end face which is substantially perpendicular to the bottom face and is connected to the bottom face by the front connector portion;
a blade being projected downward from the bottom face of the metal plate through the opening portion of the metal plate, the blade being capable of cutting while sliding the bottom face of the metal plate on an upper face of a work piece;
a motor driving the blade;
a housing accommodating the motor; and
a fluororesin coating formed on the bottom face of the metal plate and on said front connector portion,
wherein a cross section of a center portion of the bottom face, taken in a direction extending from the front end face of the metal plate to a rear end face of the metal plate is substantially concave, and
wherein a front end and a rear end of the bottom face in the cross section are substantially convex.
2. The electric tool according to claim 1 , wherein the metal plate further comprises:
a rear end face which is substantially perpendicular to the bottom face and is connected to the bottom face by a rear connector portion, said rear connector portion comprising one of an inclined surface and a curved surface, and
wherein said fluororesin coating is formed on said rear connector portion.
3. The electric tool according to claim 1 , wherein an inner periphery of said opening portion is substantially perpendicular to the bottom face of the metal plate and is connected to the bottom face by an inner connector portion, said inner connector portion comprising one of an inclined surface and a curved surface, and
wherein said fluororesin coating is formed on the inner connector portion.
4. The electric tool according to claim 2 , wherein an inner periphery of said opening portion is substantially perpendicular to the bottom face of the metal plate and is connected to the bottom face by an inner connector portion, said inner connector portion comprising one of an inclined surface and a curved surface, and
wherein said fluororesin coating is formed on the inner connector portion.
5. The electric tool according to claim 1 , further comprising:
a guide member connected to the base and including a guide face opposed to a side face of the base,
wherein the guide face of the guide member is at least partially coated by the fluororesin coating.
6. The electric tool according to claim 1 , wherein an outer periphery of the center of the bottom face of the base is convex.
7. The electric tool according to claim 1 , wherein the fluororesin coating is thickly coated on an outer peripheral portion of the bottom face of the base.
8. The electric tool according to claim 1 , further comprising:
a screw provided at the bottom face of the base for adjusting an inclination angle of the bottom face of the base,
wherein the fluororesin coating is not formed on the screw.
9. The electric tool according to claim 1 , wherein the base is provided with a roughened bottom face.
10. The electric tool according to claim 1 , wherein said fluororesin coating is impregnated with one of a ceramic powder and a powder which is harder than fluororesin.
11. The electric tool according to claim 1 , wherein a corner of the bottom face of the base includes a groove.
12. The electric tool according to claim 1 , wherein the fluororesin coating is formed on an entirety of the bottom face.
13. The electric tool according to claim 1 , wherein an entirety of said front end face is substantially perpendicular to said bottom face.
14. The electric tool according to claim 3 , wherein said inner periphery of said opening portion is formed on a rear side of said opening portion in a cutting direction.
15. The electric tool according to claim 4 , wherein the one of the inclined surface and the curved surface of the inner connector portion approaches a center of the opening as the inner connector portion extends from the bottom face of the metal plate to the opening portion.
16. The electric tool according to claim 1 , wherein a center portion of the bottom face is substantially concave in a direction extending from the front end face of the metal plate to a rear end face of the metal plate, the center portion extending from at least a front side of the opening portion to a rear side of the opening portion.
17. The electric tool according to claim 1 , wherein the fluororesin coating is impregnated with a ceramic powder.