JPH10156825A - Square shape perforating tool and its endless beltlike cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly open a box hole for mounting a switch or a plug socket in a wall material or ceiling of a building with satisfactory durability. SOLUTION: The perforating tool 1 opens a square shape box hole of a switch or a plug socket by rotatably drivably suspending an endless beltlike cutting blade 7. A timing belt 9 is fastened at an inner surface side of a suspension driven part 8 of the blade 7. The blades 7 are suspended at timing gears 5 of four corners of the tool 1 via timing belts 9, and rotatably driven via the belts 9 to make an open in a material to be processed. Particularly, it is preferable to smoothly rotatably drive the blades to fasten the belts 9 to the inner surface side of the part 8 of the blade 7 via a cushionable material to smoothly rotatably drive the blade 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square drilling tool in the field of drilling building materials and the like and an endless belt-like cutting blade thereof.

[0002]

2. Description of the Related Art Conventionally, in a building site, a rectangular box hole or an elliptical hole for electric wiring of a switch or an outlet is to be formed in a wall material or a ceiling material of a building or the like. The periphery of the shape was drilled by an electric drill or cut into a box shape by inserting a saw into the hole drilled by the electric drill.

[0003]

Therefore, in order to form a box hole, a large number of holes must be formed with an electric drill or cut into a box shape with a drawing saw. Opening a large number of box holes requires a great deal of labor and requires a long working time. Furthermore, in order to quickly and neatly open holes, considerable skill was required.

The inventor of the present invention has sought to open a box hole quickly and neatly by suspending an endless belt-shaped cutting blade provided with an opening blade on the front end side of a sprocket that has been set at a predetermined distance and rotating the sprocket. We have been developing a square hole drilling tool.

However, in order to suspend the endless belt-shaped cutting blade on a sprocket and use it with good operability, it is necessary to make the thickness of the endless belt-shaped cutting blade as thin as possible. There was a problem in durability due to breakage at the suspension part, and a material having durability was a development issue.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and in order to solve the above-mentioned problems, an endless belt-shaped cutting blade is rotatably driven by a switch or an outlet. And a timing belt attached to the inner surface side of a suspended driven portion of the endless belt-shaped cutting blade, and a timing tool at four corners of the drilling tool. In order to provide a square drilling tool, wherein a cutting blade is suspended on a gear via the timing belt, and the cutting blade is rotationally driven via the timing belt to open a workpiece. is there.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A square hole drilling tool and an endless belt-like cutting blade of the present invention are provided so as to rotatably drive an endless belt-like cutting blade to open a square box hole such as a switch or an outlet. A drilling tool for drilling, wherein a timing belt is attached to an inner surface side of a suspended driven portion of the endless belt-shaped cutting blade, and cut into timing gears at four corners of the drilling tool via the timing belt. The blade is suspended, and the cutting blade is rotationally driven via a timing belt to open a workpiece.

As shown in FIGS. 1 and 2, the angular drilling tool 1 has a rotation transmitting mechanism 4 pivotally mounted on a chuck 3 of a rotary driving tool of a power tool 2 for a rechargeable drill or the like. Sprocket-shaped timing gears 5 at four corners of the rotation transmission mechanism 4
An endless belt-shaped cutting blade 7 provided with a blade portion 6 having a saw-tooth shape is suspended, and a square hole such as a box hole for electric wiring of a wall material or a ceiling material of a building is quickly and neatly formed. The hole can be opened.

The thickness of the endless belt-shaped cutting blade 7 is preferably as small as possible.
It is practical to press-mold integrally from sheet materials of iron, steel, nickel, titanium, their alloys, and other metals, or form a belt with a predetermined width into an endless belt with an appropriate length. It can be formed by welding.

Then, a timing belt 9 having a thickness of about the thickness of the timing gear 5 is integrally attached to the inner surface of the suspended driven portion 8 at the root side of the cutting blade 7, and the cutting blade 7 is connected via the timing belt 9. It is engaged with the timing gears 5 at the four corners to suspend and rotate.

If the timing belt 9 is thinned to several mm or less, the elasticity of expansion and contraction with the cutting blade 7 is lost, so that a cushioning material such as urethane rubber is interposed between the timing belt 9 and the cutting blade 7, and FIG. , (B), it is preferable to attach via the attachment leg 10 at a predetermined interval.

The cutting portion 7 of the cutting blade 7 is preferably formed in a sawtooth shape, which is sharp and sharp. However, since the durability is easily lost, as shown in FIGS. 1 and 4 (a). It is preferable that the angle of the cutting edge is an obtuse angle of 120 to 150 degrees because durability is enhanced.

When the cutting blade 7 has an extremely thin shape of 0.1 to 0.2 mm, it is difficult to form a set. Therefore, as shown in FIGS. 4 (a) and 4 (b), by providing a convex portion 11 slightly protruding to the side by a punch, a press or the like at the center of each blade portion 6, the rotation of the cutting blade 7 is smoothly performed. The work can be easily cut.

[0014]

FIG. 1 shows an embodiment of the present invention. Endless belt-shaped cutting blade 7 of square drilling tool 1
Is a stainless steel 4 as shown in FIGS. 1 and 4 (a).
A 150 ° obtuse angled blade portion 6 is provided on the upper peripheral edge of a sheet material having a width of 4 mm and a thickness of 0.1 mm, and is joined by welding to an endless belt having a predetermined diameter.

Then, as shown in FIGS. 4 (a) and 4 (b), a timing belt 9 having a mounting leg 10 of a predetermined thickness provided on the back surface on the inner surface side of the suspended driven portion 8 at the lower peripheral portion thereof is adhered. It is attached with a chemical and engaged with the timing gear 5 of the drilling tool 1 so as to be suspended.

At the center of the blade portion 6 of the cutting blade 7, a convex portion 11 having a diameter of 1.2 mm is protruded toward the inner surface side by a press as shown in FIGS. The powder is removed so that the cutting blade 7 can rotate smoothly.

The cutting blade 7 is suspended on the timing gear 5 of the drilling tool 1 as shown in FIGS. 1 and 2, and is projected and retracted together with the rotation transmitting mechanism 4 in the same manner as the conventional one. A 50 mm × 95 mm box hole for a switch, outlet, etc. of the board was made.

As a result, the cutting speed was slightly reduced,
The switch and outlet box holes could be smoothly opened in the board, and the blade portion of the cutting blade and the suspended driven portion were hardly damaged, and sufficient durability was obtained.

In particular, a mechanism for rotating all of the timing gears at the four corners is used, and the cutting blade is rotated via the timing belt. Therefore, the distribution of force is achieved, and the durability of the cutting blade is ensured. It worked.

Further, by attaching the timing belt to the cutting blade at predetermined intervals via the mounting legs, the turning between the cutting blade and the timing belt at the time of turning at the timing gears at the four corners causes expansion and contraction. Interference can be absorbed in these spaces, and the cutting blade can be smoothly rotated.

Further, the projecting portion protruding from the blade portion can remove the cutting powder, provide an appropriate space between the blade portion and the portion to be cut, and smoothly rotate the cutting blade to form a box on the board. A hole can be opened and such a cutting blade can be manufactured at low cost.

[0022]

As described above, according to the present invention, the thin endless belt-shaped cutting blade can be driven to rotate smoothly to increase the durability and to operate quietly.

Further, a timing belt is provided on the inner surface side of the suspended driven portion of the endless belt-shaped steel cutting blade via a cushion material or a mounting leg at a predetermined interval so that the cutting blade can be smoothly rotated. By mounting, the expansion and contraction and interference between the cutting blade and the timing belt at the timing gears at the four corners can be absorbed by these, and the cutting blade can be smoothly driven to rotate.

Further, by projecting a predetermined amount of protrusion at a predetermined interval around the blade portion of the endless belt-shaped steel cutting blade, cutting powder can be removed, and the blade portion and the portion to be cut can be removed. An appropriate space can be obtained between them, and the cutting blade can be smoothly rotated to form a box hole in the board.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view, partially omitted, of an embodiment of the present invention;

FIG. 2 is a front view of the above, with a part omitted;

FIG. 3 is a front view (a) of the cutting blade and a partially enlarged cross-sectional view of the same.
(b),

FIG. 4 is a side view (a) and a side cross-sectional view (b) of the cutting blade section.

[Explanation of symbols]

1 ... drilling tool 5 ... timing gear 6
... blade 7 ... cutting blade 8 ... suspended driven part 9
... Timing belt 10 ... Leg for mounting 11 ... Protrusion

Claims (6)

[Claims] 1. A drilling tool for rotatably driving an endless belt-shaped cutting blade to open a rectangular box hole such as a switch or an outlet, wherein the endless belt-shaped cutting blade has a suspension cover. A timing belt is attached to the inner surface of the drive unit, the cutting blade is suspended via the timing belt on the timing gears at the four corners of the drilling tool, and the cutting blade is rotationally driven via the timing belt to be processed. An angular drilling tool characterized in that an object is opened. 2. An endless belt-shaped cutting blade for opening a box hole, wherein a timing belt is attached to an inner surface of a suspended driven portion of the cutting blade. Endless belt-shaped cutting blade for tools. 3. A timing belt is attached to an inner surface of a suspended driven portion of an endless belt-shaped steel cutting blade via a cushion material so that the cutting blade can be smoothly rotated. An endless belt-like cutting blade for the square drilling tool described. 4. A timing belt is attached to the inner surface of a suspended driven portion of an endless belt-shaped steel cutting blade via a mounting leg at predetermined intervals so that the cutting blade can be driven to rotate smoothly. An endless belt-shaped cutting blade for a square drilling tool according to claim 2, which is attached. 5. The angular drilling tool according to claim 2, wherein a convex portion having a predetermined amount of protrusion is protruded at a predetermined interval from a blade portion of an endless belt-shaped steel cutting blade. Endless belt-shaped cutting blade. 6. The endless belt-like cutting of a square drilling tool according to claim 5, wherein the convex portion is formed by projecting a part of the blade portion of the cutting blade to the side by a punch or a press. blade.