Portable cutting devices

Patent metadata

Field	Value
Publication number	US-10668644-B2
Application number	US-201715677609-A
Country	US
Kind code	B2
Filing date	Aug 15, 2017
Priority date	Sep 1, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

The dust proof circular saw has a main body with a rotating disc cutter blade and a cover fixed to the body to cover a blade outer radial periphery part. The body is supported by a base such that an angle of the body in the up-down and right-left directions can be adjusted at a base upper side. A further blade outer radial periphery is covered by an auxiliary cover. The auxiliary cover covers a gap between the fixed cover and the base. The auxiliary cover is moved by a mechanism relative to the body in accordance with an angle of the circular saw main body relative to the base in the up-down direction. The auxiliary cover is pivotally connected to the base, and is pivoted around a laterally tilting support shaft in the right-left direction by an interlock mechanism in accordance with a body angle in the right-left direction.

First claim

What is claimed is:

1. A portable cutting device comprising:
a cutting device main body having a motor;
a disc cutter blade that is rotated by the motor;
a fixed cover that is fixed to the cutting device main body to cover a part of an outer radial periphery of the disc cutter blade;
a base configured to support the cutting device main body such that an angle of the cutting device main body in an up-down direction relative to the base can be adjusted above the base to adjust the extent to which the disc cutter blade projects in a downward direction beneath the base, wherein the base also supports the cutting device main body such that an angle in a right-left direction of the cutting device main body relative to the base can be adjusted to adjust a tilting angle of the disc cutter blade in the right-left direction;
an auxiliary cover (1) configured to cover an outer radial periphery of the disc cutter blade between the fixed cover and the base and (2) that includes (a) an angular guide that is attached to the base and (b) a dust cover that connects the angular guide and the cutting device main body;
a laterally tilting support shaft configured to pivotally connect the auxiliary cover to the base such that the auxiliary cover can pivot around the laterally tilting support shaft relative to the base in the right-left direction in accordance with the angle of the cutting device main body in the right-left direction; and
an auxiliary cover moving mechanism that includes (1) a vertically elongated cam surface formed by the dust cover and (2) a cam follower comprising a pin protruding from the cutting device main body that interacts with the cam surface as the pin moves along the cam surface so that the dust cover is movably connected in the up-down and front-rear directions to the cutting device main body;
the cam surface includes a recessed portion of a rear edge of the dust cover in front-to-rear edge of the dust cover in a front-to-rear direction; and
the pin movably abuts the recessed portion of the cam surface.

2. The portable cutting device of claim 1 , wherein:
the base lies in a plane defined by a front-rear direction and the right-left direction,
where a frontal intersection point of the outer radial periphery of the disc cutter blade and the base moves in the rear direction when adjusting the cutting device main body upward direction, and where the frontal intersection point moves conversely in the front direction when adjusting the cutting device main body in the downward direction,
the portable cutting device includes an auxiliary cover laterally moving mechanism configured to move a lower end of the dust cover in the front-rear direction commensurate with the movement of the intersection point,
the auxiliary cover laterally moving mechanism includes a front-to-rear elongated hole formed in either one of the angular guide and the dust cover, and at least one pin protruding from the other one of the angular guide and the dust cover that is movably inserted into the front-to-rear elongated hole along the front-to-rear elongated hole.

3. The portable cutting device of claim 2 , wherein the angular guide includes a bracket to which the cutting device main body is pivotally attached in the up-down direction, wherein the bracket is formed with the front-to-rear elongated hole.

4. The portable cutting device of claim 2 , where the angular guide comprises parallel brackets which connect the cutting device main body with the auxiliary cover, where further the angular guide comprises a front wall perpendicular to the parallel brackets, wherein the front-to-rear elongated hole is located on one of the parallel brackets of the angular guide, wherein at least one of pin inserted through the front-to-rear elongated hole is perpendicular to the laterally tilting support shaft inserted through a hole on the front wall of the angular guide.

5. The portable cutting device of claim 1 , wherein the auxiliary cover moving mechanism includes a second vertically elongated cam surface comprising a second recessed portion of the rear edge of the dust cover in the front-to-rear direction, wherein a rearward protrusion lies vertically in between the vertically elongated cam surface and the second vertically elongated cam surface, and a second cam follower comprising a pin provided on the cutting device main body which movably abut the second vertically elongated cam surface along the second vertically elongated cam surface.

6. A portable cutting device comprising:
a cutting device main body having a motor;
a disc cutter blade that is rotated by the motor;
a fixed cover that is fixed to the cutting device main body to cover a part of an outer radial periphery of the disc cutter blade;
a base configured to support the cutting device main body such that an angle of the cutting device main body in an up-down direction relative to the base can be adjusted above the base, to adjust the extent to which the disc cutter blade projects in a downward direction beneath the base, wherein the base also supports the cutting device main body such that an angle in a right-left direction of the cutting device main body relative to the base can be adjusted to adjust a tilting angle of the disc cutter blade in the right-left direction;
an auxiliary cover (1) movably attached to the fixed cover to cover an outer radial periphery of the disc cutter blade between the fixed cover and the base in a cutting direction and (2) that includes (a) an angular guide that is attached to the base and (b) a dust cover that connects the angular guide and the cutting device main body; and
an auxiliary cover moving mechanism that includes (1) a vertically elongated cam surface formed by the dust cover and (2) a cam follower comprising a pin protruding from the cutting device main body that interacts with the cam surface as the pin moves along the cam surface;
the cam surface includes a recessed portion of a rear edge of the dust cover in a front-to-rear direction; and
the pin movably abuts the recessed portion of the cam surface.

7. The portable cutting device of claim 6 , wherein:
the base lies in a plane defined by a front-rear direction and the left-right direction,
where a frontal intersection point of the outer radial periphery of the disc cutter blade and the base moves in the rear direction when adjusting the cutting device main body upward direction, and where the frontal intersection point moves conversely in the front direction when adjusting the cutting device main body in the downward direction,
the portable cutting device includes an auxiliary cover laterally moving mechanism configured to move a lower end of the dust cover in the front-rear direction commensurate with the movement of the intersection point,
the auxiliary cover laterally moving mechanism includes a front-to-rear elongated hole formed in either one of the angular guide and the dust cover, and at least one pin protruding from the other one of the angular guide and the dust cover that is movably inserted into the front-to-rear elongated hole along the front-to-rear elongated hole.

8. The portable cutting device of claim 7 , wherein the angular guide includes a bracket to which the cutting device main body is pivotally attached in the up-down direction, wherein the bracket is formed with the front-to-rear elongated hole.

9. A portable cutting device comprising:
a cutting device main body having a motor;
a disc cutter blade that is rotated by the motor;
a cover body that (1) is attached to the cutting device main body to cover an outer radial periphery of the disc cutter blade and (2) includes (a) an angular guide that is attached to the base in an angle-adjustable manner in the right-left directi

Assignees

• Makita Corp

Inventors

• Okouchi Katsumi
• Ogino Yohei

Classifications

• B27B27/04

  arranged perpendicularly to the plane of the saw blade · CPC title

• B27B9/02

  Arrangements for adjusting the cutting depth or the amount of tilting · CPC title

• B27B9/00

  Portable power-driven circular saws for manual operation (details or components, e.g. handles, casings, of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title

• B23Q5/10

  driven essentially by electrical means · CPC title

• B23D47/12

  of drives for circular saw blades · CPC title