PORTABLE CUTTING DEVICE CAPABLE OF ADJUSTING CUTTING DEPTH

Abstract

A portable cutting device capable of changing and adjusting a cutting depth of a circular saw blade relative to a base with lesser labor. A saw cover has one end portion pivotally connected on the base, and another end pivotally movable toward and away from the base to change the cutting depth. An adjustment guide extends from the base in a pivotally moving direction of the saw cover in a superposed relation to the saw cover. A tightening unit is disposed to the saw cover at a position superposed with the adjustment guide and the saw cover for providing a selective tightening between the saw cover and the adjustment guide. The tightening unit includes a shaft part extending through the saw cover and the adjustment guide, a pivot operation part pivotally movable about an axis of the shaft part, and an urging part disposed over the shaft part and movable by the pivot operation part in the axial direction of the shaft part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings;

FIG. 1 is a plan view of a portable cutting device according to an embodiment of the present invention;

FIG. 2 is a side view of the portable cutting device according to the embodiment of the invention, when observed from a side opposite to a housing;

FIG. 3 is a front view of the portable cutting device according to the embodiment;

FIG. 4 is a rear view of the portable cutting device according to the embodiment;

FIG. 5( a) is a rear view of a saw cover of the portable cutting device according to the embodiment;

FIG. 5( b) an enlarged cross-sectional side view of a rear portion of the saw cover in a cutting direction;

FIG. 6( a) is a plan view of a link of the portable cutting device according to the embodiment;

FIG. 6( b) is a cross-sectional view taken along the line VI-VI;

FIG. 7 is a side cross-sectional view depicting a periphery of a connecting part of the portable cutting device according to the embodiment;

FIG. 8 is a perspective view depicting a bolt of the portable cutting device according to the embodiment;

FIG. 9( a) is a front perspective view depicting a washer of the portable cutting device according to the embodiment;

FIG. 9( b) is a rear perspective view of the washer;

FIG. 10( a) is a front perspective view depicting a pivot operation part of the portable cutting device according to the embodiment;

FIG. 10( b) is a rear perspective view of the pivot operation part;

FIG. 11 is a side view showing the portable cutting device according to the embodiment and observed from the opposite side to the housing in a state where an amount of protrusion of a circular saw blade is changed;

FIG. 12 is a side cross-sectional view depicting a connecting part in the embodiment in a state where a saw cover body part and a guide are tightened;

FIG. 13 is a plan view depicting the washer and the pivot operation part of the portable cutting device according to the embodiment;

FIG. 14 is a plan view depicting the washer and the pivot operation part of the portable cutting device according to the embodiment in a state where the pivot operation part is pivotally moved;

FIG. 15 is a perspective view of a washer according to a modification to the embodiment; and

FIG. 16 is a perspective view of a pivot operation part according to a modification to the embodiment.

Claims

1. A portable cutting device comprising: a housing;a motor disposed in the housing;a circular saw blade driven by the motor for cutting a workpiece;a saw cover provided to the housing and covering a generally half region of the circular saw blade;a base supporting the saw cover and in contact with the workpiece to be cut; anda mechanism for changing protrusion amount of the circular saw blade from the base; the mechanism comprising a pivot support portion that pivotably movably supports the saw cover with respect to the base, and a regulating portion that selectively fixes a pivot posture of the saw cover relative to the base, the regulating portion comprising:an adjustment guide extending from the base in a pivotally moving direction of the saw cover in a superposed relation to the saw cover; anda tightening unit disposed at a position superposed with the adjustment guide and the saw cover for providing a selective tightening between the saw cover and the adjustment guide the tightening unit comprising:a shaft part extending through the saw cover and the adjustment guide and extending out of the saw cover;a pivot operation part pivotally movable about an axis of the shaft part; andan urging part disposed over the shaft part and in contact with the pivot operation part, the urging part being movable in a direction of the axis of the shaft part upon pivot movement of the pivot operation part for increasing a tightening force between the saw cover and the adjustment guide.

2. The portable cutting device as claimed in claim 1, wherein one of the urging part and the pivot operation part is provided with a convex part protruding toward the remaining one of the urging part and the pivot operation part, and a slope part sloping down from the convex part, the convex part and the slope part being alternately arrayed in a circumferential direction of the shaft part; and wherein remaining one of the urging part and the pivot operation part is provided with a protrusion part protruding toward the one of the urging part and the pivot operation part and in abutment with the one of the urging part and the pivot operation part, the protrusion part being slidable on the slope part.

3. The portable cutting device as claimed in claim 2, wherein the convex part includes a plurality of convex parts arrayed around the shaft part at equal interval in the circumferential direction; and wherein the protrusion part includes a plurality of protrusion parts corresponding to the plurality of convex parts and arrayed around the shaft part at equal interval in the circumferential direction.

4. The portable cutting device as claimed in claim 2, wherein the pivot operation part comprises a body part disposed over the shaft part, and a lever part extending from the body part in a direction perpendicular to the shaft part, the lever part being configured to be oriented in parallel to a plane containing the circular saw blade when the protrusion part is positioned closest to the convex part.

5. The portable cutting device as claimed in claim 2, wherein the pivot operation part comprises a body part disposed over the shaft part, and a lever part extending from the body part in a direction perpendicular to the shaft part, and, wherein the motor is disposed at one circular plane side of the circular saw blade, the lever part being configured to be oriented toward the motor when the protrusion part is positioned closest to the convex part.

6. The portable cutting device as claimed in claim 2, wherein the convex part includes at least a first convex part and a second convex part arrayed around the shaft part in a circumferential direction thereof, and wherein the slope part includes at least a first slope part sloping from the first convex part, and a second slope part sloping from the second convex part and connected to the first slope part, the projection part being slidable on either one of the first slope part and the second slope part.

7. The portable cutting device as claimed in claim 6, wherein the pivot operation part comprises a body part disposed over the shaft part, and a lever part extending from the body part in a direction perpendicular to the shaft part, the body part having an abutment protrusion, and the portable cutting device further comprising: a first stopper and a second stopper those protruding from the saw cover at positions to allow the abutment protrusion to be brought into abutment thereto for avoiding over-rotation of the body part to prevent the projection part from climbing over the convex part.

8. The portable cutting device as claimed in claim 2, wherein the convex part includes at least a first convex part and a second convex part arrayed around the shaft part in a circumferential direction thereof, and wherein the slope part includes at least a first slope part sloping from a top of the first convex part to a bottom of the second convex part, and a second slope part sloping from a top of the second convex part to a bottom of the first convex part, the projection part being slidable on one of the first slope part and the second slope part.

9. The portable cutting device as claimed in claim 1, wherein the urging part is a separate component independent of the saw cover and the adjustment guide.

10. The portable cutting device as claimed in claim 1, wherein the shaft portion has a tip end portion formed with a thread portion; and wherein the tightening unit further comprises a nut threadingly engaged with the thread portion and positioned opposite to the saw cover with respect to the pivot operation part for adjusting a position of the pivot operation part in an axial direction of the shaft part.

11. The portable cutting device as claimed in claim 1, further comprising a tilt mechanism for laterally tilting the saw cover relative to the base and selectively fixing a tilting posture of the saw cover.