Portable electric cutting apparatus

• US 20070271799A1
• Filed: 07/24/2007
• Published: 11/29/2007
• Est. Priority Date: 01/26/2004
• Status: Active Grant

• Current Assignee: Koki Holdings Co., Ltd.
• Original Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Inventors: Niwa, Kenji, Konnai, Takuya, Tanimoto, Hideyuki, Imai, Teruo
• Granted Patent: US 7,861,417 B2
• Time in Patent Office: Days
• US Class Current: 30/391
• CPC Class Codes: B23D 59/006 for removing or collecting chips
• CPC Class Codes: B23Q 17/2404 Arrangements for improving direct observation of the working space, e.g. using mirrors or lamps structural combinations of lighting devices with other articles, not otherwise provided for, F21V33/00

Abstract

A portable electric cutting apparatus includes a housing for housing an electric motor rotating a saw blade a saw cover attached to the housing, the saw cover having a shape to cover an upper half of an outer periphery, the saw cover including a saw blade housing portion at least partially housing the saw blade and a cylindrical portion having a substantially cylindrical shape, the cylindrical portion connecting to the housing at an end face of the cylindrical portion a base being joined to at least one of the saw cover and the housing, the base having an opening to allow the saw blade to project downwardly from a bottom face which is slidable on a cut material and a fan being driven by the electric motor, wherein a discharge passage forming member is provided with the saw cover so as to form a discharge passage by cooperating with a wall face of the saw cover.

Claims

1. A portable electric cutting apparatus, comprising:

a housing for housing an electric motor rotating a saw blade;

a saw cover attached to the housing, the saw cover having a shape to cover an upper half of an outer periphery, the saw cover including;

a saw blade housing portion at least partially housing the saw blade; and

a cylindrical portion having a substantially cylindrical shape, the cylindrical portion connecting to the housing at an end face of the cylindrical portion;

a base being joined to at least one of the saw cover and the housing, the base having an opening to allow the saw blade to project downwardly from a bottom face which is slidable on a cut material; and

a fan being driven by the electric motor, wherein a discharge passage forming member is provided with the saw cover so as to form a discharge passage by cooperating with a wall face of the saw cover,

wherein a fan wind generated by driving the fan is discharged into the discharge passage forming member of the saw cover,

wherein a fan wind discharging portion of the discharge passage forming member is disposed on the saw cover and on an outer periphery of the saw blade housing with respect to a radial direction of the saw blade, and

wherein a part of the fan wind discharged from the fan wind discharging portion is discharged toward a front side of the base in a cutting direction through the discharge passage of the discharge passage forming member.

2. The portable electric cutting apparatus according to claim 1, wherein the discharge passage forming member is attachable to the saw cover by a screw.

3. The portable electric cutting apparatus according to claim 1, wherein the fan wind discharging portion opens into the discharge passage forming member.

4. The portable electric cutting apparatus according to claim 1, wherein the fan wind discharging portion forms an angular U-shaped channel in cross-section.

5. The portable electric cutting apparatus according to claim 1, wherein the discharge passage forming member comprises a first end and a second end, the first end being blocked and formed to cover the fan wind discharging portion.

6. The portable electric cutting apparatus according to claim 5, wherein the second end of the discharge passage forming member comprises an opening that opens toward a cutting direction of the portable electric cutting apparatus.

7. The portable electric cutting apparatus according to claim 1, wherein the discharge passage forming member is positioned on the saw cover.

8. The portable electric cutting apparatus according to claim 1, further comprising a guide piece formed on the base, wherein the fan wind exhausts from the discharge passage onto the guide piece.

9. The portable electric cutting apparatus according to claim 1, wherein the discharge passage forming member comprises a fixing part having a hole formed therein for attaching the discharge passage forming member to the saw cover.

10. The portable electric cutting apparatus according to claim 9, wherein the saw cover comprises a tapped hole to receive the screw for attaching the discharge passage forming member through the fixing part to the saw cover.

11. The portable electric cuffing apparatus according to claim 1, wherein the fan wind generated by driving the fan is discharged into the saw blade housing part.

12. The portable electric cutting apparatus according to claim 1, further comprising a handle connected to the housing, wherein the fan wind discharging portion is formed between the saw cover and the handle.

13. The portable electric cutting apparatus according to claim 1, wherein the discharge passage comprises a space formed between the discharge passage forming member and an outer wall of the saw cover.

14. The portable electric cutting apparatus according to claim 1, wherein the discharge passage forming member is removable attachable to the cover.

15. A portable electric cutting apparatus, comprising:

a housing for housing an electric motor rotating a saw blade;

a saw cover attached to the housing;

a fan being provided in the housing, the fan being driven by the electric motor to produce a fan wind; and

a discharge passage forming member, that discharges the fan wind, provided with the saw cover to form a discharge passage by cooperating with a wall face of the saw cover.

16. The portable electric cutting apparatus according to claim 15, further comprising a fan wind discharging portion formed on the saw cover and on an outer periphery of the saw blade housing with respect to a radial direction of the saw blade.

17. The portable electric cutting apparatus according to claim 15, wherein a part of the fan wind discharged from the fan wind discharging portion is discharged toward a front side of the base in a cutting direction through the discharge passage of the discharge passage forming member.