JPH10100019A - Saw tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize excellent linearity and to improve the discharge performance of saw dust in the transverse or diagonal cutting by alternately providing a tooth having an inwardly inclined surface, and a tooth having an outwardly inclined surface cut on the outer side. SOLUTION: A first tooth 15 is provided with an inwardly inclined surface 14 which is formed by performing diagonal cut from a connection part to the side closer to the set center line L, i.e., inwardly on the inner side. A second tooth 17 is provided with an outwardly inclined surface 16 which is formed by performing diagonal cut from the connection part to the side away from the set center line L, i.e., outwardly on the outer side. The first tooth 15 and the second tooth 17 are alternately provided to each other. The first tooth 15 having a pointed cutting edge 19 contributes to the linearity, and the second tooth 17 having a linear tooth edge 21 improves the discharge performance of saw dust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw tooth having a continuous cutting blade having an upper blade, a lower blade, and a portion forming an upper eye connecting the tips thereof.

[0002]

2. Description of the Related Art The upper and lower blades, each having an upper eye formed at the tip thereof, are called horizontal pulling teeth, and are usually used for a manual horizontal pulling saw. It can be dealt with. In addition, there is a type in which machinability is further improved. For example, various improved tooth profiles have been proposed for the purpose of improving the sharpness of diagonal cutting. It is thought that they are mainly aimed at improving the straight-cutting property (straightness) and the sawdust discharging performance, but none of them have been provided yet.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and its object is to provide both good straightness and sawdust discharge performance in cutting such as horizontal drawing or oblique cutting. Is to be able to improve.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a connecting portion 13 which forms an upper eye as a saw blade.
A first tooth 15 having an inwardly inclined surface 14 cut inward with respect to the center line L of the set, and a connecting portion 13 forming the upper eye cut out with respect to the set center line L. A means is provided in which second teeth 17 having outwardly inclined surfaces 16 are provided alternately.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A saw tooth 10 according to the present invention
1 and a lower blade 12 and a portion forming an upper eye connecting the tip portions thereof.

FIG. 1 shows an example of a double-edged saw S for hand pulling. In this case, the tooth 10 having the above-described configuration is a side pulling tooth T. The portion U is shown in FIGS.

FIG. 2 shows an example of the state of the above-mentioned tooth 10 before upper machining. The teeth 10 in this state are, as described above,
1 and a lower blade 12 and a connecting portion 13 connecting the tips 11a and 12a thereof (see FIG. 2B).

In the tooth 10 illustrated in FIG. 2 (a), the nudge angle (also referred to as a shinogi angle) A of the upper blade 11 and the nudge angle B of the lower blade 12 are expressed in the same manner. It can be changed according to the state.

The connecting portion 13 forming the upper eye of the tooth 10 in this state is subjected to the improved upper working according to the present invention. In terms of improvement, there are two types having different configurations and functions. One type of improved tooth 10 is referred to as a first tooth 15 for convenience, and the other type of improved tooth 10 is similarly referred to as a second tooth 17. .

When the first tooth 15 is expressed on the basis of the center line L of a set (tooth shaking) to be processed thereafter, the first tooth 15 is formed by being cut obliquely from the connecting portion 13 to the side of the set center line L, that is, inside. It has an inward inclined surface 14. In the case of the illustrated example in which the upper blade 11 and the lower blade 12 form a rogue 18,
The inwardly inclined surface 14 is defined by the tip 12 a of the lower blade 12, a point 11 b at which a line from the lower edge 12 toward the upper blade 11 at an acute included angle intersects the upper blade 11, and a point 18 a on the forging 18. Inverted triangle.

When the upper blade 11 and the lower blade 12 do not directly form the claws 18, the inclined surface 14 has a square shape. With a saw tooth profile with an upper eye that can be called such an inwardly inclined surface,
The tip 12 a of the lower blade 12 serves as a cutting edge 19. This tip 1
Numeral 9 functions as a hair puller, that is, a guide when cutting the cut surface in a linear manner.

The second tooth 17 has an outwardly inclined surface 16 formed by cutting the connecting portion 13 away from the set center line L, that is, obliquely outward. The outwardly inclined surface 16 mainly has an action of improving the sawdust discharging performance, and may be provided directly on the connecting portion 13 or may be provided on a portion slightly lower than the connecting portion 13. The illustration is an example of the latter. In this case, the tooth height is slightly lower than the tooth height of the first teeth 15, so that the tooth height is lower than the cutting edge 19 when cutting with a saw (from a normal working posture in which the teeth are lower). If you do above)
Since the tooth tip line 21 is located (see FIG. 2C), the sawdust dischargeability is further improved.

In the case of the example shown in the figure, the outwardly inclined surface 16 is formed by the point of intersection 12b between the tooth tip line 21 and the lower blade 12, the point of intersection 18b between the tooth tip line 21 and the edge 18 and both points 18b, 12b. A triangle (or a quadrangle) defined by a point 11c generated by the inclined line lowered on the line 11 is obtained. In the example shown in FIG. 2B, the tooth tip line 21 is set horizontally, that is, in a direction parallel to the sawing direction or in a direction perpendicular to the lower blade 12.
However, it is not limited to this.

Although the present invention has been described with reference to a manual saw, the present invention can be applied to other saw teeth. The unset processing, which is not described above, is to be performed on the first and second teeth 15 and 17 after the above-described upper-end processing, as shown in FIGS. I do.

The first tooth 15 and the second tooth 15
The teeth 17 are provided alternately one by one, or alternately two by two as shown in the drawing, and alternately by other combinations. As described above, the first teeth 15 having the point-like tips 19 contribute to the straightness, and the second teeth having the linear tips 21 improve the discharging performance of sawdust. The arrangement of the first teeth 15 and the second teeth 17 can be changed depending on conditions such as whether there are many oblique cuts.

[0016]

The present invention is constructed and operated as described above, and combines the first teeth 15 for improving the straightness and the second teeth 17 for improving the sawdust discharging property. Therefore, both of the two performances can be improved, and the sharpness of horizontal pulling and diagonal cutting can be significantly improved, and the sharpness of hardwood can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a double-sided saw having saw teeth according to the present invention.

FIG. 2 (a) is a plan view of saw teeth before upper machining. (B) Front view which shows embodiment which implements this invention to the tooth of FIG. (C) A left side view of the tooth of FIG.

FIG. 3 (a) is a plan view showing an example of a saw tooth according to the present invention. (B) Front view of FIG. FIG. 3C is an enlarged sectional view taken along line III-III of FIG.

Claims (2)

[Claims] A cutting blade having a portion forming an upper eye connecting an upper blade and a lower blade and a tip portion thereof is a continuous saw tooth, and the connecting portion 13 forming the upper eye is provided. A first tooth 15 having an inwardly inclined surface 14 machined on the side of the center line L of the set, and a connecting portion 13 forming the upper eye
And a second tooth 17 having an outwardly inclined surface 16 cut outwardly with respect to a set center line L. 2. The saw tooth according to claim 1, wherein the height of the second tooth is set lower than the height of the first tooth.