JP5435401B2 - Saw blade and reciprocating saw - Google Patents

Description

  The present invention relates to a saw blade and a reciprocating saw, and more particularly to a saw blade and a reciprocating saw for cutting a pipe or the like.

  2. Description of the Related Art A reciprocating saw for cutting a metal pipe or the like by reciprocating a saw blade in a substantially extending direction is conventionally known. As shown in FIG. 6, the saw blade 110 has an attachment portion 111 and a blade portion 112. The base end portion of the blade portion 112 is connected to the mounting portion 111, and a plurality of teeth 112A are provided on the lower end edge shown in FIG. The blade portion 112 extends curvedly downward as shown in FIG. 6, and the plurality of blades 112 </ b> A of the blade portion 112 is more specifically in a direction from the substantially distal end side to the substantially proximal end side of the blade portion 112. Extends in the direction from the upper left to the lower right in FIG. Such a saw blade 110 is described in, for example, Japanese Patent Application Laid-Open No. 2001-179536 (Patent Document 1).

JP 2001-179536 A

  In the conventional saw blade 110 as described above, when the saw blade 110 is pulled from the left to the right in FIG. 6, the saw blade 110 is moved from the distal end side to the proximal end side to cut the workpiece 2. In some cases, as shown in FIG. 7A, at the portion near the tip of the blade portion 112, an angle formed by an imaginary line connecting the tooth tips and the moving direction of the saw blade 110 (hereinafter referred to as "tooth tip angle"). Since c is large, it can be cut efficiently. However, in the portion near the base end of the blade portion 112, as shown in FIG. 7B, the tooth tip angle d is small, so the cutting becomes small and the cutting efficiency is poor.

  Further, when the saw blade 110 is moved from the proximal end side to the distal end side by pressing the saw blade 110 from right to left in FIG. 6, as shown in FIG. Since the tooth tip angle c is large at the close portion, the friction between the tooth 112A and the workpiece 2 is also small. For this reason, the amount of heat generated by friction is small, and the hardness of the blade portion 112 due to heat generation is relatively small, and the durability is good. However, in the portion near the base end of the blade portion 112, as shown in FIG. 8B, the tooth tip angle d is small, so that the friction between the tooth 112A and the workpiece 2 is increased, and the amount of heat generated by the friction is increased. The tooth tip temperature is 600 ° C. or higher. For this reason, the hardness reduction of the blade part 112 by heat_generation | fever becomes large, the abrasion of tooth | gear 112A arises, and durability worsens.

  Further, in order to improve the cutting efficiency and durability of the portion near the base end of the blade portion 112, it is conceivable to incline the entire blade portion 112 to increase the tooth tip angle of the portion close to the base end. If the tooth tip angle is large in the entire portion 112, the blade portion 112 is greatly violated in the initial stage of cutting, resulting in a problem that workability is significantly reduced.

  Therefore, an object of the present invention is to provide a saw blade with good cutting efficiency and durability and a reciprocating saw having the saw blade.

  In order to achieve the above object, the present invention provides a mounting portion, a base end side portion connected to the mounting portion, a tip end side portion connected to the base end side portion, and the base end side portion. A saw blade side surface extending to the tip side portion, and a saw blade capable of reciprocating in a direction of a virtual straight line passing through the mounting portion, the saw blade being a virtual plane including the virtual straight line and the saw On the virtual plane parallel to the blade side surface, the base end side portion extends from the attachment portion in a direction from one side to the other side with respect to the virtual straight line, and the tip side portion on the virtual plane is related to the virtual straight line. The base end side portion that extends from the base end side portion in the direction from the other side to the one side, forms a substantially arc between the base end side portion and the tip end side portion, and corresponds to the inner end edge of the substantially arc. A plurality of teeth are provided on each of the end edge and the end edge of the tip side, and the tooth tips of the plurality of teeth on the tip side are Extending in a direction approaching to the side, the tooth tip of said plurality of teeth of the base end side has provided saw blade extending in a direction approaching to the tip side.

  On the virtual plane including the virtual straight line and parallel to the side surface of the saw blade, the base end side portion extends from the mounting portion in the direction from one side to the other side with respect to the virtual straight line, and the distal end side on the virtual plane The base portion extends from the base end side in the direction from the other side to the one side with respect to the imaginary straight line, and forms a substantially arc at the base end side portion and the tip end side portion, and corresponds to the inner end edge of the substantially arc. A plurality of teeth are provided on each of the end edge and the end edge of the distal end side, and the tips of the plurality of teeth on the distal end side extend in a direction approaching the proximal end side, and the teeth of the multiple teeth on the proximal end side Since the tip extends in the direction approaching the distal end side, the angle formed by the imaginary line connecting the tooth tips on the distal end side portion and the virtual straight line is increased, and the virtual tip formed by connecting the tooth tips on the proximal end side portion. The angle formed by the line and the virtual line can be increased.

  For this reason, when the saw blade is pulled, the material to be cut can be cut efficiently at the tip side, and when the saw blade is pushed, the material to be cut is cut efficiently at the base end side. Can do.

  In addition, when the saw blade is pulled, the friction between the teeth and the material to be cut can be reduced at the base end side, and when the saw blade is pressed, the friction between the teeth and the material to be cut is reduced at the tip side. can do. As a result, the amount of heat generated by friction can be reduced at the distal end side portion and the proximal end side portion, and the decrease in hardness of the blade portion due to heat can be reduced to improve the durability.

  Here, it is preferable that a groove portion recessed in a direction from one side to the other side with respect to the imaginary straight line is formed in a connection portion between the base end side portion and the distal end side portion.

  A groove that is recessed in the direction from one side to the other side with respect to the imaginary straight line is formed at the connection portion between the base end side portion and the tip end side portion, and thus occurs at the base end side portion and the tip end side portion. The frictional heat can be effectively released in the groove, and the cooling effect on the base end side portion and the tip end side portion can be enhanced.

  Preferably, the saw blade according to claim 1 or 2 is provided and the saw blade is reciprocated in a direction in which the virtual straight line is directed.

  Since the saw blade of claim 1 or 2 is provided and the saw blade is reciprocated in the direction of the virtual straight line, a reciprocating saw with good cutting efficiency and excellent durability can be obtained.

  The present invention also provides a reciprocating saw blade having an attachment portion, a proximal end side portion connected to the attachment portion, and a distal end side portion connected to the proximal end side portion, The base end side portion and the tip end side portion form a substantially arc, and a plurality of teeth are provided on the end edge of the base end side portion and the end edge of the tip end side portion corresponding to the inner end edge of the substantially arc, The tooth tips of the plurality of teeth on the distal end side are oriented in a direction approaching the proximal end side portion, and the tooth tips of the plurality of teeth on the proximal end side portion are oriented in a direction approaching the distal end side portion. Is offering a saw blade.

  The tooth tips of the plurality of teeth on the distal end side are oriented in the direction approaching the proximal end side portion, and the tooth tips of the plurality of teeth on the proximal end side portion are oriented in the direction approaching the distal end side portion. The angle formed by the virtual line connecting the tooth tips and the virtual straight line can be increased, and the angle formed by the virtual line connecting the tooth tips and the virtual straight line can be increased at the base end side portion.

  For this reason, when the saw blade is pulled, the material to be cut can be cut efficiently at the tip side, and when the saw blade is pushed, the material to be cut is cut efficiently at the base end side. Can do.

  In addition, when the saw blade is pulled, the friction between the teeth and the material to be cut can be reduced at the base end side, and when the saw blade is pressed, the friction between the teeth and the material to be cut is reduced at the tip side. can do. As a result, the amount of heat generated by friction can be reduced at the distal end side portion and the proximal end side portion, and the decrease in hardness of the blade portion due to heat can be reduced to improve the durability.

  The present invention also includes an attachment portion extending in the front-rear direction, a proximal end portion extending forward and upward from the attachment portion, and a distal end side portion extending forward and downward from the proximal end side portion. A base end side tooth portion provided with a plurality of teeth extending forward and downward, and provided at a lower portion of the distal end side portion and extending rearward and downward. A saw blade having a tip side tooth portion including a plurality of teeth is provided.

  A base end side tooth portion provided with a plurality of teeth provided at the lower portion of the base end side portion and extending forward and downward, and a plurality of portions provided at a lower portion of the tip end side portion and extending rearward and downward. A distal-side tooth portion including the teeth of the distal-side tooth portion, the angle between the imaginary line connecting the tooth tips at the distal-side tooth portion and the imaginary straight line extending in the front-rear direction is increased, and the proximal-side tooth portion The angle formed by the virtual line connecting the tooth tips and the virtual straight line extending in the front-rear direction can be increased.

  For this reason, when the saw blade is pulled, the material to be cut can be cut efficiently at the tip side tooth portion, and when the saw blade is pushed, the material to be cut is cut efficiently at the base end side tooth portion. can do.

  In addition, when the saw blade is pulled, the friction between the teeth and the material to be cut can be reduced at the proximal tooth portion, and when the saw blade is pressed, the friction between the teeth and the material to be cut at the distal tooth portion. Can be reduced. As a result, the amount of heat generated by friction can be reduced at the distal end side blade portion and the proximal end side tooth portion, and the decrease in hardness of the blade portion due to heat can be reduced to improve durability.

  Here, it is preferable that the distal side tooth portion has a longer length in the front-rear direction than the proximal end side tooth portion. Since the distal side tooth portion is longer in the front-rear direction than the proximal end side tooth portion, the material to be cut can be cut more effectively at the distal end side blade portion.

  Moreover, this invention provides the reciprocating saw which has the saw blade of Claim 5 or Claim 6. Since the reciprocating saw has the saw blade according to claim 5 or 6, the reciprocating saw having good cutting efficiency and excellent durability can be obtained.

  As described above, the present invention can provide a saw blade with good cutting efficiency and durability and a reciprocating saw having the saw blade.

Sectional drawing which shows the reciprocating saw according to the embodiment of the present invention. The side view which shows the saw blade by embodiment of this invention. The side view which shows a mode that the to-be-cut material is cut | disconnected with the saw blade by embodiment of this invention. It is a figure which shows a mode that the saw blade by embodiment of this invention is pulled, (a) is sectional drawing which shows a mode that it is pulling with respect to a to-be-cut material in the front end side part, (b) is a base end side Sectional drawing which shows a mode that it is pulling with respect to to-be-cut material in the part. It is a figure which shows a mode that the saw blade by embodiment of this invention is pushed, (a) is sectional drawing which shows a mode that it is pushing with respect to a to-be-cut material in the front end side part, (b) is a base end side part. Sectional drawing which shows a mode that it is pushing with respect to a to-be-cut material. The side view which shows a mode that the to-be-cut material is cut | disconnected with the conventional saw blade. It is a figure which shows a mode that the conventional saw blade is pulled, (a) is sectional drawing which shows a mode that it is pulling with respect to a to-be-cut material in the part near the front-end | tip of a blade part, (b) is a base of a blade part. Sectional drawing which shows a mode that it has pulled with respect to the to-be-cut material in the part near an end. It is a figure which shows a mode that the conventional saw blade is pushed, (a) is sectional drawing which shows a mode that it is pushing with respect to a to-be-cut material in the part near the front-end | tip of a blade part, (b) is near the front-end | tip of a blade part. Sectional drawing which shows a mode that it is pushing with respect to a to-be-cut material in the part.

  Embodiments of a saw blade and a reciprocating saw according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the reciprocating saw 1 is a so-called Saber saw, and has a saw blade 10 and a main body 20. The main body 20 has a housing 21, and a motor 22 is accommodated in the housing 21. A power cord 23 is attached to the housing 21, and power from an AC power source (not shown) can be supplied to the motor 22 via the power cord 23. Here, for convenience of explanation, the left side of the reciprocating saw 1 shown in FIG. 1 is defined as the front, the right side is defined as the rear, the upper side is defined as the upper side, and the lower side is defined as the lower side.

  The housing 21 has a handle 24 at its rear end. The handle 24 is provided with a trigger switch 24A. When the user of the reciprocating saw 1 operates the trigger switch 24A, an AC power supply (not shown) and the motor 22 are electrically connected, and the motor 22 is driven. Is configured to do. In the housing 21 and in front of the motor 22, a motion conversion mechanism 25 configured by a gear mechanism or the like and connected to the output shaft 22 </ b> A of the motor 22 is provided. An attachment portion 11 of a saw blade 10 to be described later is connected to the motion conversion mechanism 25, and the rotation of the motor 22 can be converted into a reciprocating motion of the saw blade 10 via the motion conversion mechanism 25. Yes.

  As shown in FIG. 2, the saw blade 10 has a mounting portion 11, a proximal end side portion 12, and a distal end side portion 13, and the proximal end side portion 12 and the distal end side portion 13 form an arc shape. Yes. A virtual straight line 11A directed in the direction in which the saw blade 10 is reciprocated by the motion conversion mechanism 25 (FIG. 1) passes through the attachment portion 11, the virtual straight line 11A is directed in the front-rear direction, and the virtual straight line 11A is It is included in a virtual plane that coincides with the surface of the paper surface of FIG.

  The rear end of the base end side portion 12 is integrally connected to the front end of the attachment portion 11. The base end side portion 12 has a substantially plate-like band shape, and the base end side portion 12 extends from the attachment portion 11 in the direction from the lower side to the upper side with respect to the virtual straight line 11A on the virtual plane. More specifically, as shown in FIG. 2, the extension direction of the base end portion gradually approaches the direction parallel to the virtual straight line 11 </ b> A of the attachment portion 11 as it approaches the front end from the rear end of the base end side portion 12. Is curved. Since it is curved in this way, it is possible to prevent the saw blade 10 from violating when the workpiece 2 is being cut. The lower side of the virtual straight line 11A corresponds to one side, and the upper side of the virtual straight line 11A corresponds to the other side.

  A direction B extending in the longitudinal direction of the base end side portion 12 and extending from the attachment portion 11 is a direction in which the virtual straight line 11A is directed and is upward with respect to a direction A from the attachment portion 11 toward the base end side portion 12. Has an acute angle. The angle formed by the direction B and the direction A is not less than 5 ° and not more than 20 °. The reason why the angle is set to 5 ° or more is that when the angle is less than 5 °, the biting into the material to be cut 2 is deteriorated and the cutting efficiency and durability cannot be improved. Further, the reason why the angle is set to 20 ° or less is that when the angle exceeds 20 °, the saw blade 10 is greatly violated at the initial stage of cutting and workability is remarkably deteriorated. The upper side of the virtual straight line 11A corresponds to the other side.

  A plurality of teeth 12 </ b> A is provided on the lower end edge that extends in the longitudinal direction of the base end side portion 12. The tooth tips of the plurality of teeth 12 </ b> A are oriented in a direction approaching the distal end side portion 13. The portion of the base end side portion 12 provided with the plurality of teeth 12A corresponds to the base end side tooth portion.

  The rear end of the distal end side portion 13 is integrally connected to the front end of the proximal end side portion 12. The distal end side portion 13 has a substantially plate-like band shape, and the distal end side portion 13 extends from the proximal end side portion 12 in the direction from the upper side to the lower side with respect to the virtual straight line 11A on the virtual plane described above. . More specifically, as shown in FIG. 2, as the tip end portion 13 approaches the front end from the rear end, the extension direction of the tip portion gradually moves away from a state close to parallel to the virtual straight line 11 </ b> A of the attachment portion 11. It is curved. Since it is curved in this way, it is possible to prevent the saw blade 10 from violating when the workpiece 2 is being cut.

  A direction C extending in the longitudinal direction of the distal end side portion 13 and extending from the proximal end side portion 12 forms an acute angle downward with respect to the direction A. The angle formed by the direction C and the direction A is not less than 5 ° and not more than 20 °. The reason why the angle is set to 5 ° or more is that when the angle is less than 5 °, the biting into the material to be cut 2 is deteriorated and the cutting efficiency and durability cannot be improved. Further, the reason why the angle is set to 20 ° or less is that when the angle exceeds 20 °, the saw blade 10 is greatly violated at the initial stage of cutting and workability is remarkably deteriorated.

  A plurality of teeth 13 </ b> A are provided on the lower end edge that extends in the longitudinal direction of the distal end side portion 13. The tooth tips of the plurality of teeth 13 </ b> A are each directed in a direction approaching the base end side portion 12. The portion of the distal end side portion 13 provided with a plurality of teeth 13A corresponds to the distal end side tooth portion, and the distal end side tooth portion is configured to be longer than the proximal end side tooth portion in the front-rear direction.

  The length in the longitudinal direction of the proximal end side portion 12 is a value in the range of ¼ or more and ½ or less of the sum of the length in the longitudinal direction of the proximal end side portion 12 and the length in the longitudinal direction of the distal end side portion 13. take. A groove 10 a is formed at a connection portion between the proximal end side portion 12 and the distal end side portion 13. The groove 10a is formed to be recessed from the lower end edge of the saw blade 10 to the upper end edge at a depth that is approximately twice the height of the teeth 12A. For this reason, the frictional heat generated in the proximal end side portion 12 and the distal end side portion 13 can be effectively released in the groove 10a, and the cooling effect in the proximal end side portion 12 and the distal end side portion 13 can be enhanced. .

  When the metal pipe as the workpiece 2 as shown in FIG. 3 is cut, the saw blade 10 is moved from the distal end side to the proximal end side by cutting the saw blade 10 to cut the workpiece 2. 4A, at the tip side portion 13 of the saw blade 10, an angle formed by an imaginary line connecting the tooth tips and the moving direction of the saw blade 10 (hereinafter referred to as "tooth tip angle"). Since a is large, it can be cut efficiently. Further, as shown in FIG. 4B, the base end side portion 12 has a large tooth tip angle b, so that the friction between the teeth 12A and the workpiece 2 is small. For this reason, the amount of heat generated by friction is small, and the hardness of the base end side portion 12 due to heat is relatively small, and the durability is good.

  Further, when the saw blade 10 is moved from the proximal end side to the distal end side by pressing the saw blade 10, the tooth tip angle a is large at the distal end side portion 13 as shown in FIG. The friction between the teeth 13A and the workpiece 2 is also small. For this reason, the amount of heat generated by friction is small, and the hardness of the saw blade 10 due to heat is relatively small and durability is good. Moreover, since the tooth tip angle b is large as shown in FIG.5 (b) in the base end side part 12, it can cut | disconnect efficiently. Therefore, the reciprocating saw 1 having good cutting efficiency and excellent durability can be obtained.

  The saw blade and the reciprocating saw of the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, although the saw blade 10 is provided in the reciprocating saw 1 in the present embodiment, the saw blade 10 is not limited to being used in such a form. Further, the saw blade 10 is not limited to being used for a reciprocating saw in which the saw blade simply reciprocates, and may be used for a reciprocating saw having a scooping motion function, for example.

  The saw blade and reciprocating saw of the present invention are particularly useful in the field of saws where cutting efficiency and durability are required.

1 ・ ・ Reciprocating saw 10 ・ ・ Saw blade 10a ・ ・ Groove 11 ・ ・ Mounting part 12 ・ ・ Base end side 13 ・ ・ Front end side 12A, 13A ・ ・ Tooth

Claims (7)

A mounting portion;
A proximal side connected to the mounting portion;
A distal end side connected to the proximal end side;
A saw blade side surface extending from the base side to the tip side,
A saw blade capable of reciprocating in a direction of a virtual straight line passing through the attachment portion,
On the virtual plane including the virtual straight line and parallel to the side surface of the saw blade, the base end side portion extends from the attachment portion in a direction from one side to the other side with respect to the virtual straight line, On the plane, the distal end side portion extends from the proximal end side portion in the direction from the other side to the one side with respect to the virtual straight line, and the proximal end side portion and the distal end side portion form a substantially circular arc. A plurality of teeth are provided on the edge of the base side and the edge of the tip side corresponding to the inner edge of
The tips of the plurality of teeth on the distal side are directed in a direction approaching the proximal side,
A saw blade characterized in that the tips of the plurality of teeth on the proximal end side are oriented in a direction approaching the distal end side portion.   The groove portion that is recessed in a direction from one side to the other side with respect to the virtual straight line is formed in a connection portion between the base end side portion and the tip end side portion. Saw blade.   A reciprocating saw having the saw blade according to claim 1 or 2, wherein the saw blade is reciprocated in a direction in which the virtual straight line is directed. A mounting portion;
A proximal side connected to the mounting portion;
A reciprocating saw blade having a distal end side connected to the proximal end side,
The proximal end portion and the distal end side portion form a substantially circular arc, and a plurality of teeth are provided on the edge of the proximal end side portion and the edge of the distal end side portion corresponding to the inner edge of the substantially circular arc, respectively. ,
The tips of the plurality of teeth on the distal side are directed in a direction approaching the proximal side,
A saw blade characterized in that the tips of the plurality of teeth on the proximal end side are oriented in a direction approaching the distal end side portion. A mounting portion extending in the front-rear direction;
A proximal end portion extending forward and upward from the mounting portion;
A distal side extending forward and downward from the proximal side;
A proximal-side tooth portion provided at a lower portion of the proximal-end side portion and including a plurality of teeth extending forward and downward;
A saw blade having a plurality of teeth provided at a lower portion of the tip side portion and extending rearward and downward.   The saw blade according to claim 5, wherein the tip side tooth portion has a length in the front-rear direction larger than the base end side tooth portion.   A reciprocating saw having the saw blade according to claim 5 or 6.

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