JPS5826751Y2 - Saw blade for cutting tatami floors - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a saw blade for cutting tatami floors.

If some of the pillars of the Japanese-style room protrude inward from the threshold, or if you are digging a hearth or kotatsu in the Japanese-style room, cut a part of the tatami floor to fit the size of the pillar, hearth, kotatsu, etc. ing.

FIG. 1 shows an example of the above-mentioned cutting locations, where 1 is the tatami floor, 1a is the side edge, and 1b.

1c and 1d are cutting surfaces, respectively, and these cutting surfaces 1
b, lc, and 1d are inclined at an angle θ with respect to the vertical plane.

Conventionally, a knife was used to cut the tatami floor 1 as described above, but when a knife is used, the frictional force applied to both sides of the knife is large, so a large force is required for cutting. However, there was a drawback that the sharpness deteriorated immediately when the cutting edge wore out.

Therefore, recently, an electric saw 2 for woodworking as shown in FIG. 2 has come into use.

This electric saw 2 has a handheld handle 3a at the top of a main body 3 that includes a motor (not shown), and an elongated saw blade 4 that reciprocates in the vertical direction is attached to the lower front surface of the main body 3. The convex top surface 7a of the adjustment fitting 7 fixed to the top surface of the flat sliding base 6 is rotatably fitted into the concave bottom surface 5a of the metal plate 5 of the receiver fixed to the central lower surface of the main body 3, and the bolt (not shown).

The convex upper surface 7a of the adjustment fitting 7 can be adjusted by adjusting the phase of the concave bottom surface 5a of the metal 5 and appropriately setting the angle of inclination of the saw blade 4 with respect to the vertical line. 1c and 1d can be tilted by an angle θ with respect to the vertical plane.

The above-mentioned electric saw 2 has a large number of saw teeth carved along the front edge of the saw blade 4, which are inclined alternately left and right with respect to the left and right sides of the saw blade 4, so that the tips of the saw teeth are attached to the saw blade. It protrudes slightly to the left and right from both the left and right sides of 4, so
If the tatami bed 1 is made only from rice straw, it can be easily cut with much less force than a conventional knife.

However, on the other hand, the tatami floor 1 is made of polystyrene foam board or incubation fiberboard (a soft fiberboard obtained by steaming and defibrating wood chips or cotton waste, adding a waterproofing agent, making paper, and drying). In the case of products made by stacking rice straw, or products made only of insulation fiberboard, the cut surface 1b
, 1c.

A large number of unevenness is formed on 1d, and the cut surface is 1by1cm1d.
There were drawbacks such as unsteadiness and inaccurate dimensions.

Further, since the saw blade 4 does not have a blade at the lower end, it is necessary to make a cut with a kitchen knife before piercing the saw blade 4 into the center of the tatami floor 1.

In addition, when cutting with a knife, the cut surfaces 1b, lc, 1
d becomes smooth, but on the other hand, as mentioned above, a large force is required for cutting, and the sharpness tends to deteriorate.

This invention provides a saw blade for cutting tatami floors that can easily pierce and cut tatami floors made of polystyrene foam board or insulation fiberboard, and can also make the cut surface smooth. It is.

Examples of this invention will be described below with reference to FIGS. 3 to 5.

The saw blade 8 is formed so that the width in the front-rear direction becomes slightly wider from the top toward the bottom, and a large number of saw teeth 8a are carved along the front edge.

However, this saw m8a is different from normal saw teeth,
It is thinly formed into a double-edged knife shape as shown in FIG.

The lower end edge 8b of this saw blade 8 forms an obtuse angle (for example, approximately 135 degrees) with respect to the row of saw teeth 8a, is inclined backwardly, and has an acute cutting point 8c at its rear end. are doing.

In addition, 8d is the rear edge of the saw blade 8, 8e is a mounting part for attaching the saw blade 8 to the electric saw body 3, and 8
f is a screw hole.

In the above structure, the saw blade 8 is connected to the electric saw 2.
When the tatami floor 1 made of polystyrene foam board, insulation fiberboard, etc. is cut, the front line with numerous saw teeth 8a is formed into a double-edged knife shape, resulting in a smooth and clean cut surface. 1b,
lc and 1d can be obtained, and in addition, no large force is required for cutting, and there is little deterioration in sharpness.

Since the lower edge 8b is inclined backwardly and has an acute cutting edge 8C at the rear end, the cutting edge 8C and the lower edge 8b are
By pressing the saw blade 8 against the tatami floor 1, the saw blade 8 is easily pierced through the tatami floor 1, so that the tatami floor 1 can be easily cut along the cutting surface 1d at the center.

In the embodiment described above, the saw blade 8 may have the same width in the front and rear directions.

It goes without saying that the electric saw 2 is not limited to that shown in FIG. 2.

As explained above, this invention is based on a saw blade for cutting tatami floors whose upper end is attached to the electric saw body so that it can move vertically and reciprocally. Tatami flooring made of polystyrene foam board or insulated fiberboard, because it is slanted backwards to form an acute cutting edge at the rear end, and the front and lower edges mentioned above are thinly formed into a double-edged knife shape. can be easily pierced and cut, and a smooth cut surface with no irregularities can be obtained, with little loss of sharpness.

[Brief explanation of drawings]

Figure 1 is a perspective view of a part of the tatami floor, Figure 2 is a perspective view of a conventional electric saw, Figure 3 is a side view of an embodiment of this invention, Figure 4 is line ■-IV in Figure 3. Cross-sectional view, Figure 5 is v of Figure 3
-V line sectional view. 2...Electric saw, 3...Main body, 8
...Saw blade, 8a...Sawtooth,
8b...Lower edge, 8c...Tip, 8d
... Trailing edge.

Claims (1)

[Scope of utility model registration request] In a saw blade for cutting tatami flooring, the upper end of which is attached to the electric saw body and reciprocated in the vertical direction, the lower end following the leading edge with saw teeth is slanted backwards, and the trailing end has an acute angle. A saw blade for cutting a tatami floor, characterized in that the front line and lower edge are formed thinly like a double-edged knife.