JPH0671101U - Hand saw - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain sharpness. [Structure] A tooth having lateral teeth is formed from a head side to a root side, and eight teeth including a first tooth 11 to an eighth tooth 18 are set as one set, and a large number of the sets are sequentially repeated to form a side surface shape. And the tooth tops 11b to 14b of each of the first to fourth teeth of each set.
Is located on the first straight line L1, and the tooth tips 15b and 16b of the fifth and sixth teeth of each set are located on the second straight line L2 located on the root side of the first straight line. Then, the tooth tips 17b, 18b of the seventh tooth and the eighth tooth of each set are formed so as to be located on the third straight line L3 located on the root side of the second straight line,
It is characterized in that the distance between the first straight line and the third straight line is set to be smaller than the biting amount of the first tooth to the fourth tooth with respect to the work material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a hand-saw for horizontal wood traverse.

[0002]

[Prior art]

 As shown in FIG. 2, a conventional hand-saw for side-walking has a tooth pitch P1, P2 formed by gradually reducing the size of the teeth 1a, 1b, 1c ... From the head side to the root side. , P 3, ... are sequentially reduced, and although not shown, the teeth are of equal size and of equal pitch. In any case, the line connecting the tooth tips 2a, 2b, 2c, ... Of each tooth in the side shape is on one straight line L, and the tooth profile is provided with the upper eye 3 peculiar to the sideways. The upper stitches 3 are for preventing the transverse teeth that cut wood at a right angle to the fiber direction from deeply biting at once. In such a conventional saw having side-spreading teeth, the acting force in the biting direction of each tooth is uniformly dispersed during use. Therefore, the bite depth of each tooth is substantially constant. In the figure, θ is a cutting angle, which is usually around 90 degrees.

[0003]

[Problems to be solved by the device]

 When grinding a work material with a conventional horizontal saw, since the line connecting the tips 2a, 2b, 2c of each tooth in a side shape is on one straight line L, move the saw horizontally. When grinding, the vertical component of the force applied to the saw is dispersed and applied to each tooth that is in contact with the work material, and each tooth tip bites into the work material, and in that state, the horizontal component is applied. The force is applied and the cutting is performed. That is, each tooth moves in an even bite state and each performs a certain amount of cutting. When the pointed tip 2 of the tooth 1 wears, the bite amount becomes extremely smaller than immediately after setting. Therefore, when the same grinding method is used, the cutting amount becomes small and the work efficiency decreases. Also, the user feels that the sharpness has deteriorated. The present invention is intended to provide a hand saw having a long-lasting sharpness.

[0004]

[Means for Solving the Problems]

 According to the means of the present invention, the teeth formed in lateral teeth are arranged so that the number of teeth from the head side to the root side is 8 from the 1st tooth to the 8th tooth, and a large number of them are sequentially repeated. The tip of each of the first to fourth teeth of each set is located on the first straight line in the side surface shape, and the tip of the fifth and sixth teeth of each set is the first tip. Is located on the second straight line on the root side of the straight line, and the tip of the seventh and eighth teeth of each set is on the root side of the second straight line. It is formed so as to be located on a straight line, and the distance between the first straight line and the third straight line is determined to be smaller than the biting amount of the first tooth to the fourth tooth with respect to the work material.

[0005]

[Action]

 With a hand saw, when the saw is moved horizontally to grind, the vertical component of the force generally applied to the saw is dispersed to each tooth that is in contact with the work material to act on each tooth. The tip bites into the work material, and the horizontal component force acts in the biting state to perform cutting. If the tip of each tooth is lateral and is in a straight line, if it is pressed vertically against a horizontal surface, each tooth will be bite into the tooth evenly, and if it is moved as it is, each tooth will perform a certain amount of cutting. . However, since the first to fourth teeth of each set are most protruded, the first tooth to the fourth tooth have the largest biting state of each tooth, then the fifth to sixth teeth, and It becomes smaller in the order of the seventh tooth and the eighth tooth. The biting amount of the first to fourth teeth is larger than that in which the tips of the teeth are aligned, as much as the vertical component force is concentrated on the first to fourth teeth. When cutting is performed by horizontal component force in this bite state, not only the first to fourth teeth are cut, but also the fifth, sixth, and seventh and eighth teeth are involved. You can That is, if the distances of the second straight line and the third straight line from the first straight line are determined within the range of the bite amount of the first to fourth teeth, the fifth tooth, sixth tooth, and seventh tooth must be , The 8th tooth is also involved. In the cutting state in this case, the 5th tooth, the 6th tooth, and the 7th tooth and the 8th tooth share the biting amount of the 1st tooth to the 4th tooth. The cutting load is not extremely concentrated on the teeth. Therefore, the biting is basically good and the cutting load is distributed to each tooth to some extent when cutting by horizontal component force, so that cutting is performed well and the degree of wear of each tooth is similar. Also, when the tip of a sharp tooth wears, the bite amount decreases, but the vertical component force concentrates on the first to fourth teeth, so the bite amount decreases less than before, in other words, The amount of bite is large even in the same wear state. Therefore, in the case of the same grinding method, the cutting amount from the state of a new product or immediately after setting until the sharpness is reduced to the same degree is significantly increased as compared with the conventional one.

[0006]

【Example】

 One embodiment of the present invention is shown in FIG. The figure shows several continuous teeth of the side saw hand saw. The left side of the figure is the head side and the right side is the root side. A large number of sets of teeth, each of which has eight teeth 18 as one set, are sequentially arranged, and a normal clam is provided. The pitch P (4 mm) of each tooth is the same. In the manufacture of this saw tooth, the same saw tooth as that of the conventional equal pitch is formed in advance, and the height of the tooth is changed as follows when forming the upper stitches 11a to 18a. The four teeth of the first tooth 11 to the fourth tooth 14 of each set have a tooth length of 7 mm, the first tooth 11 and the third tooth 13 are the same, the second tooth 12 and the fourth tooth 14 are the same, and , The third tooth 11 and 13 and the second and fourth tooth 12 and 14 are symmetrical, and the tips 11b to 14b are on the straight line L1. The fifth tooth 15 and the sixth tooth 16 of each set have a symmetrical shape, and the tooth tips 15b to 16b are on a straight line L2 that is 0.3 mm away from the straight line L1 toward the root side. The seventh tooth 17 and the eighth tooth 18 of each set have a symmetrical shape, and the tooth tips 17b to 18b are on a straight line L3 which is 0.4 mm away from the straight line L1 toward the root side. This value of 0.4 mm is a little smaller than this because the biting amount of the first tooth 11 to the fourth tooth 14 when cutting wood is generally about 0.5 mm. This bite amount can be increased by making the cutting edge angle sharp, but if it is too large, the wear resistance and the like will be reduced, and therefore, about 60 ° is appropriate as usual. It is to be noted that the first tooth to the fourth tooth have the same tooth height, and the other fifth tooth to the eighth tooth are sequentially lowered every two sheets, because there is no first and second tooth 11 and 12. In this case, it was found that the wear of the 3rd and 4th teeth progressed a little faster than other teeth, so the 1st and 2nd teeth of the same tooth length were provided to share the wear. It is a thing.

The hand saw constructed as described above has a sharpness that is about 1.5 times longer than that of a conventional one (having the same tooth length of the saw of the embodiment) under the same use condition. The feeling of use is almost the same as the conventional one.

In the above-described embodiment, the saw teeth have the same pitch, but the present invention can be applied to a saw tooth whose teeth gradually decrease from the head side toward the root and whose pitch gradually decreases. A substantially similar effect can be obtained.

[0009]

[Effect of device]

 According to the present invention, the tooth length of the sawteeth is made equal to four from the head side, and the pair is made slightly lower by two and further lowered by two, so that the tooth biting is maintained for a long time. Therefore, it is possible to provide a hand saw that can maintain a good sharpness for a long time.

[Brief description of drawings]

FIG. 1 is a partially enlarged side view of a saw tooth according to an embodiment of the present invention.

FIG. 2 is a partially enlarged side view of a conventional saw tooth.

[Explanation of symbols]

 11-18 1st tooth-8th tooth 11a-18a Upper eye 11b-18b Tooth tip L1 1st straight line L2 2nd straight line L3 3rd straight line

Claims (1)

[Scope of utility model registration request] 1. A lateral profile of a tooth whose lateral profile is formed by laterally arranging teeth having eight teeth, which are first to eighth teeth from the head side to the root side, as one set, and which is repeated in sequence. The tip of each of the first to fourth teeth of each set is located on a first straight line, and the tip of each of the fifth and sixth teeth of each set is more than the first straight line. Are also located on the second straight line on the root side, and the tips of the seventh and eighth teeth of each set are located on the third straight line on the root side with respect to the second straight line. And a distance between the first straight line and the third straight line is set to be smaller than the amount of the first tooth to the fourth tooth biting into the work material.