JPS6139521Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is used for pruning, etc., and uses a saw blade that becomes thicker from the back to the teeth. This relates to a hand-saw saw in which the saw teeth formed on the section are cut alternately from the front and back sides, and the top of the cutting blade is distributed to the left and right within the thickness of the saw blade, omitting the shaving process. This is an invention related to saw teeth that effectively removes the chevron-shaped ridges that are left uncut between the tops of the cutting surface when cutting wood, resulting in superior cutting quality.

[Conventional technology]

As shown in FIG. 7, in this kind of conventional hand saw, all the saw teeth are usually sharpened in the same way alternately on the left and right sides.

In addition to the serrations that have sharp tops on the left and right edges, there is also the idea of arranging the serrations of plane blades in appropriate numbers with a lower height [Utility Model Publication No. 35-22493], and saws with oscillating teeth. There is a known idea [Utility Model Application No. 53-95495] in which the front surface is single-edged and sub-saw teeth formed perpendicular to the tooth row are incorporated inside the tooth width.

[Problem that the invention attempts to solve]

In the conventional saw shown in Fig. 7, when cutting the object B with the saw A, the protrusion E formed on the bottom D of the cutting line C is scraped by a part of the saw teeth, as shown in Fig. 6. It will be taken. Therefore, a force greater than that originally required for cutting was required, and the cutting ability was poor. Furthermore, in the case of cutting the protrusion E with a plane blade as in Utility Model Publication No. 35-22493, the resistance caused by the plane blade increases when the saw is used for horizontal sawing.
This can be seen from the fact that when planing a board, if you plan the planer perpendicular to the wood grain, there will be a lot of resistance and you will not be able to get a beautiful finished surface.

In addition, in saws that perform tooth swinging (saw processing), the Jikaisho technique incorporates a sub-saw tooth of a different type from other saw teeth.
In the invention of No. 53-95495, it is difficult to process a different type of secondary sawtooth, and since this secondary sawtooth is formed in a direction perpendicular to the tooth row, the direction of the secondary sawtooth and the protrusion E that is its cut surface are difficult to process. The slanted surface forms an acute angle, which does not result in efficient cutting.

In view of these points, the present invention has devised a hand saw that can more efficiently cut out the ridges that tend to form between the tops of the saw teeth and is easy to manufacture. .

[Means to solve the problem]

Using the saw blade 1, which becomes thicker from the back to the teeth, cut the saw blade alternately from the front and back sides, and cut the tops 4 and 4 of the cutting blade within the thickness of the saw blade 1. The parts are placed alternately on the left and right, and the parts that omit the clam processing are processed as before. After that, some of the saw teeth 5 are bent inward at every predetermined number of saw teeth over the entire length of the saw blade 1, and the tops 6, 6 of the saw teeth 5 are positioned inside the tops 4, 4 of other saw teeth, The inwardly bent sawtooth 5 is
It is assumed that the saw blade 1 is directed inward by an amount equivalent to the bending angle.

[Effect]

When cutting wood horizontally with this invented hand saw,
The tops 4 and 4, which are located at the outermost side within the thickness of the saw blade and are placed alternately on the left and right, cut into the wood while making incisions. In other words, the distance between the left and right tops 4, 4 is the width of the cut strip.

In the conventional saw, as shown in FIG. 6, a chevron-shaped protrusion E is formed on the bottom D of the cut line C, and this is scraped off or scraped off by the cutting edge of each saw tooth or its back surface. In contrast, in the present invention, the protruding portion to be formed is cut from the left and right sides as close to perpendicular to the slope as possible by the tops 6, 6 of the saw teeth 5, 5 bent inward. .

〔Example〕

A hand saw in which the thickness of the saw blade 1 is made thinner at the back than at the teeth, and the cutting process is omitted, is used as a pruning saw with a relatively narrow saw blade, as shown in FIG.

In such a hand saw, first, the saw teeth 2, 2 are formed on the thick side of the saw blade 1, as in the conventional saw, and the saw teeth 2, 2 are sharpened alternately from the front side and the back side of the saw blade. , the tops 4, 4 of the cutting blade 3 are positioned alternately on the left and right sides within the range of the thickness of the saw blade.

Next, some of the saw teeth 5, 5 are bent inward from the middle at every predetermined number of saw teeth 2, 2 formed over the entire length of the saw blade 1, and the tops 6, 6 are folded into other saw teeth 2. ，
Position it inward from the heavens 4 and 4 of 2.

The sawtooth 5 can be bent at any point from a position close to the base to a position close to the tip, that is, a position close to the top 6, but if it is bent close to the top, the bending angle should be increased. It turns out.

[Effect of idea]

According to the hand saw of the present invention, when cross-cutting a workpiece, the protrusions that are conventionally formed within the cut line and increase the resistance can be efficiently cut from a direction close to perpendicular to the slope of the protrusion, thereby making it extremely In addition to being able to produce a saw with excellent sharpness, it is manufactured by forming all the saw teeth alternately on the left and right sides, for example, by an automatic machine, and then bending only some of the saw teeth inward. It can be manufactured by a simple process of, for example, manufacturing a sawtooth of a different type, and is extremely economical as it can significantly reduce the manufacturing cost.

[Brief explanation of the drawing]

Figures 1 to 5 of the accompanying drawings show an embodiment of the hand saw of the present invention, and Figure 1 is an overall front view;
Fig. 2 is a partial enlarged view of only the sawtooth portion, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a - line sectional view in Fig. 2.
5 is a cross-sectional view of the cut end of the workpiece cut by the hand saw of the present invention; FIG. 6 is a cross-sectional view of the cut end of the workpiece cut by the conventional hand saw FIG. 7 is a vertical sectional view of a conventional hand saw. 1... saw blade, 2, 5... saw tooth, 3... cutting blade,
4, 6...Heaven.

Claims (1)

[Scope of utility model registration request] Using the saw blade 1, which becomes thicker from the back to the teeth, cut the saw blade alternately from the front and back sides, and cut the tops 4 and 4 of the cutting blade left and right within the thickness of the saw blade 1. In a device in which the tops 4 and 4 are arranged alternately to cut the wood grain and the cutting process is omitted, some of the saw teeth 5 are folded inward at a predetermined number of saw teeth over the entire length of the saw blade 1. The tops 6, 6 of the saw teeth are positioned inside the tops 4, 4 of the other saw teeth, and the inwardly bent saw teeth 5 are directed inward by an amount equivalent to the bending angle with respect to the saw blade 1. A hand saw that is characterized by