JP2019000985A - Graver - Google Patents

Abstract

To provide a graver that is easy to use and has a good use feeling.SOLUTION: In a graver 1 including a handle 2, a blade body 3 and a protection member 4, the protection member 4 has a guard part 6, thereby enabling a protection posture where the guard part 6 is positioned around the blade. Furthermore, in the protection posture, when the longitudinal direction of the handle 2 is in such a condition as tilted against a target surface at a predetermined angle, the blade can contact the target surface, restricting the range of the angle at which the guard part 6 enables the contact. At this time, when the angle formed by a virtual line extending in the longitudinal direction of the handle 2 and the target surface is in the range of 15 degrees to 40 degrees, the blade contacts the target surface.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a carving sword, and more particularly to a carving sword with a protective member capable of protecting a user's hand and the cutting edge of the carving sword.

  Traditionally, sculptured swords are used as teaching materials for drawing work in primary education. And what was equipped with the protection member surrounding the circumference | surroundings of a blade is known as a sculpture sword which can be safely used even by a young person unfamiliar with the blade.

As an example of such an engraving sword, there is an engraving sword disclosed in Patent Document 1.
In the engraving sword disclosed in Patent Document 1, the protection member is attached to be movable with respect to the handle portion. And the state in which the protection member jumps out of the handle member and covers the periphery of the cutting edge and the state in which the protection member is housed inside the handle member can be switched.

That is, a user who is unfamiliar with the handling of the blade can use it safely by using the protective member covering the periphery of the blade edge.
On the other hand, a skilled user may feel the protective member located around the blade edge in the way. In such a case, the user can use the protective member in the same manner as a sword without a protective member by storing the protective member inside the handle member.

That is, the engraving sword disclosed in Patent Document 1 can be comfortably used by various users having different skill levels by changing the position of the protective member.
Further, unlike the structure in which the protective member is attached to and detached from the handle member, the removed protective member is not lost, which is preferable.

JP 2013-091304 A

  By the way, the engraving sword disclosed in Patent Document 1 has room for further improvement from the viewpoint of further facilitating engraving work and further improving usability.

Further, the engraving sword disclosed in Patent Document 1 has room for further improvement from the viewpoint of making the protective member more difficult to break.
In other words, as described above, the sculpture sword is assumed to be used by young people and may be used unexpectedly. Then, the protective member may be damaged by using the sword in an unpredictable posture or by applying a force other than normal, for example.
Here, since the protection member is a safety member for the purpose of protecting the hand or the like, it is preferable that the protection member is less likely to break. That is, a protective member that is more difficult to break has been desired.

  That is, the engraving sword having the conventional protective member has been desired to improve the feeling of use and safety.

  Therefore, the present invention makes it possible to provide an engraved sword that is easy to use and easy to use.

Invention of Claim 1 for solving the said subject is equipped with a handle | steering-wheel part, the blade body part attached to the said handle | pattern part, and a protection member, The blade formed in the said blade body part is made into an object surface. The engraving sword that can be used in contact with the protective member, wherein the protective member has a guard portion that can be disposed at least around the blade body portion, and the guard portion is in a protective posture positioned around the blade. In the protection posture, the longitudinal direction of the handle portion is inclined with respect to the target surface, and the blade is brought into contact with the target surface by being inclined at a predetermined angle. The imaginary line extending in the longitudinal direction of the handle portion in the protective posture and the target, wherein at least the guard portion regulates the range of the angle at which the blade and the target surface can contact each other. The angle formed by the surface is 15 degrees or more and 40 degrees or less Chisel which the blade when it is enclosed, characterized in that contact with the target surface.
Here, the “target surface” is a surface to be engraved such as the surface of a plywood, and is a surface of an engraving object that contacts the blade when using the engraving sword.

By the way, when a target surface (surface to be engraved) is engraved with a general engraving knife, it may be difficult to engrave depending on how the blade contacts the target surface. Therefore, as a result of conducting sensory tests on various people by the present inventors, the angle between the longitudinal direction of the engraving sword (longitudinal direction of the handle) and the target surface was set to a posture that exceeded 40 degrees. Sometimes it turned out to be difficult to do the work. In addition, it has been found that if the posture is laid more than 15 degrees, it becomes difficult to work.
Therefore, in the engraving sword of the present invention, when the blade is brought into contact with the target surface (for example, the surface of the wood block), the blade contacts when the inclination of the sculpture sword (pattern portion) with respect to the target surface is within the above range. It is said. In other words, the blade does not come into contact with the target surface when the posture is set beyond the range or when the posture is laid down beyond the range.
In this way, the blade contacts the target surface when the posture is easy to work, and the blade does not touch when the posture is difficult to work. However, the posture is easy to work naturally. For this reason, even if a person unfamiliar with the work uses it, it is possible to provide an easy-to-use engraved sword.
In addition, the user who is unfamiliar with the operation can continue to use the engraving sword of the present invention, so that the user can naturally expect to learn how to apply the preferred blade to the target surface.
Furthermore, since the guard portion functions as an angle regulating member, the posture can be restricted without unnecessarily increasing the number of parts. That is, it is possible to reduce the manufacturing cost, and the feeling of use does not deteriorate due to the reason that a newly provided component becomes an obstacle during use.

  The invention according to claim 2 is the front and rear from the front end portion of the guard portion to the blade in the state of the protective posture when the longitudinal direction of the handle portion is the front-rear direction and the blade body side is the front side. A virtual line when the blade and the guard portion are connected by a virtual line segment extending in the vertical direction in a state where the distance in the direction is L2, the protective posture, and the front-rear direction is parallel to the horizontal plane. The length of the minute is L3, and the L2 is 4.0 mm or more and 8.0 mm or less, and the L3 is 1.0 mm or more and 3.0 mm or less. A sword.

According to this configuration, the blade is sufficiently hidden in the front view and the side view, and the guard portion does not get in the way at the time of work (at the time of engraving work), so the engraving sword has high safety and good usability. Can provide. In addition, the posture can be restricted as described above with the guard portion having a natural shape.
Here, the “front view” is a plan view seen from the front. In addition, the “side view” is a plan view seen from the side, and is a side view when the surface to be engraved is the lower side and the opposite side is the upper side when the blade is in contact with the surface to be engraved. is there.

  The invention according to claim 3 is the one end side in the direction orthogonal to the front-rear direction with the blade body side as the front side with the longitudinal direction of the handle portion as the front-rear direction, and the blade is the target surface as the protective posture The lower surface of the handle portion is positioned below the lower end of the guard portion, and the lower surface portion of the handle portion is located below the lower end of the guard portion. 3. The engraving sword according to claim 1, wherein a portion of the front end side periphery also regulates the range of the angle.

  According to such a configuration, the guard portion and the handle portion function as an angle restricting member, thereby making it possible to limit the posture described above while making the engraving knife a more natural shape.

  The invention according to claim 4 is the one end side in the direction perpendicular to the front-rear direction, with the blade body side as the front side, with the longitudinal direction of the handle portion as the front-rear direction, and the blade is the target surface as the protective posture When the object surface in the state of contact with the lower side is the lower side and the opposite side is the upper side, the guard portion extends by connecting two guard forming pieces and the front end sides of the two guard forming pieces. A guard connecting piece, and extends continuously in a semi-annular manner outside the front end and both side ends of the blade body portion in the protection posture, and the guard forming piece is the blade body in the protection posture. 4. The curved surface extending from the lower surface to the front surface is formed on the front end side of the guard forming piece on the front side of the guard portion. The engraving sword .

  According to such a configuration, it is preferable that when the blade is brought into contact with the target surface, even if the guard portion comes into contact with a different part of the target surface, the guard portion hardly disturbs the engraving work.

  The invention according to claim 5 is the one end side in the direction orthogonal to the front-rear direction with the blade body side as the front side, with the longitudinal direction of the handle portion as the front-rear direction, and the blade as the target surface as the protective posture When the object surface side in the state of contact with the lower side is the lower side and the opposite side is the upper side, the guard portion has two guard forming pieces, and in the protective posture, the two guard forming pieces The blade body portion is positioned therebetween, and the guard forming piece extends in the front-rear direction outside the blade body portion, and the guard forming piece includes a rear end side portion extending in the front-rear direction and a front side A tip side portion extending in a direction toward the upper side as it goes toward the top, and a neck portion that is a portion narrower than other portions is formed on the tip side portion of the guard forming piece, and the guard formation Elastic deformation of the tip of the piece A chisel as claimed in any one of claims 1 to 4, characterized in that possible is.

  In such a configuration, a constricted part is formed at the tip side part of the guard part, and when the force is applied to the tip side part of the guard part for some reason, the guard part is deformed to suppress damage to the guard part. it can.

  The invention according to claim 6 is the engraving sword according to claim 5, wherein the constricted portion is formed in a portion from the rear end of the tip side portion of the guard forming piece.

  In such a configuration, the constricted portion is formed in the portion from the rear end that is the base end side in the protruding direction, and it can be deformed so as to enlarge the whole, so that the guard portion is prevented from being damaged. To more preferred.

In the invention according to claim 7, the average value of the cross-sectional secondary moment of the cross section of the constricted portion is 100 mm ⁴ or more and 300 mm ⁴ or less, and the cross-section secondary of the cross section in the rear end portion of the guard forming piece. The sword according to claim 5 or 6, wherein the sword is smaller than a minimum value of moment.

According to such a configuration, the guard portion can be deformed so as to be deformed while ensuring a certain level of strength and difficulty in deformation.
More specifically, it is preferable that the guard portion be easily deformed to a certain extent and widen the elastic range from the viewpoint of preventing breakage when a large force is applied unexpectedly. However, on the other hand, from the viewpoint of ensuring safety during normal use, it is preferable that the material is not deformed to the extent that light force is applied. Therefore, by adopting the above-described configuration, it is possible to form a suitable guard portion both when a large force is applied unexpectedly and during normal use.

  In the invention according to claim 8, the rear end portion of the constricted portion is located on the rear side in the front-rear direction with respect to the blade, and the front end portion of the constricted portion is on the front side in the front-rear direction with respect to the blade. The engraving sword according to any one of claims 5 to 7, wherein the sword is located.

  In such a configuration, when the guard portion is deformed by being pressed against the object, the guard portion is deformed so as to be formed from the rear end portion of the constricted portion located behind the blade. For this reason, when the guard portion is deformed, the blade (the front end of the blade body portion) can easily come into contact with the object. And by making a blade contact an object, the further deformation | transformation of a guard part can be prevented and damage to a guard part can be prevented.

  In the invention according to claim 9, in the handle portion, a handle inner space capable of accommodating at least a part of the guard portion is formed in the handle portion, and the handle inner space is formed on a front side of the handle portion. It has an opening portion, and the upper end portion of the opening portion is located slightly above the upper end portion of the guard portion, or the upper end portion of the guard portion and the vertical position are the same. The protection member is attached so as to be relatively movable with respect to the handle portion, and by moving the protection member, the protection posture and at least a part of the guard portion are It is possible to switch between the storage postures stored in the interior space of the handle, and in the storage postures, there is a slight gap between each part of the upper surface of the guard portion located in the interior space of the handle and the upper surface of the interior space of the handle. Facing each other or touching A chisel according to one of claims 5 to 8, wherein the door.

  According to such a configuration, even if the guard portion is deformed beyond the elastic range for some reason, it is restored to the original shape (or a shape close to the original shape) by performing an operation to switch to the storage posture. It becomes possible.

  The invention according to claim 10 is characterized in that the protective member is a resin molded body formed using polyacetal and polyamide as main raw materials, and the guard portion is integrally molded with the protective member. The engraving sword according to any one of claims 1 to 9.

In such a configuration, it is possible to easily and inexpensively form a guard part that is not easily deformed to a sufficient degree to function as an angle restricting member and that is easily deformed to a desirable degree when deforming according to a strong force applied unexpectedly. It is.
Here, the “main raw material” means that a sufficient amount for exhibiting the function is contained. Further, the phrase “mainly made of polyacetal and polyamide” as used herein means that the proportion of the polyacetal and polyamide in the whole raw material is 50% or more.

  The invention according to claim 11 is an engraving sword provided with a handle, a blade body attached to the front end side of the handle, and a protection member, wherein the protection member is at least of the blade body. It has a guard part that can be arranged in the periphery, a blade is formed on the blade body part, and the guard part can be in a protective posture positioned around the blade, The distance in the front-rear direction from the front end portion of the guard part to the blade is L2, the protective posture, the front-back direction is parallel to the horizontal plane, and the blade and the guard portion extend in the vertical direction. When the length of the imaginary line segment when connecting with the line segment is L3, the L2 is 4.0 mm or more and 8.0 mm or less, and the L3 is 1.0 mm or more and 3.0 mm or less. It is a characteristic sword.

  Even in the engraving sword having such a configuration, the posture can be restricted as described above while the guard portion has a natural shape.

  According to the present invention, it is possible to provide an engraved sword that is easy to use and has a good feeling of use.

It is a perspective view which shows the engraving sword concerning embodiment of this invention, (a) shows a protection attitude | position and (b) shows an accommodation attitude | position. It is a disassembled perspective view which shows the engraving sword of FIG. It is a partially broken perspective view which shows the handle | pattern part of FIG. It is a side view which shows the front end vicinity of the engraving sword of Fig.1 (a). In the engraving sword of FIG. 4, the guard portion is broken at the center portion in the width direction, and one side side in the width direction is omitted. It is sectional drawing which shows the sword of FIG. 4, (a) is AA sectional drawing, (b) is BB sectional drawing. It is explanatory drawing which shows a mode that the front end side of the engraving sword of FIG. 1 is turned downward and pressed against the plane on the lower side, (a) shows a state before pressing, and (b) shows a state after pressing. It is explanatory drawing which shows typically the handle | steering-piece part of FIG. 1, and the front-end side part of a protection member, and is a figure which shows a mode at the time of shifting a protection attitude | position from a protection attitude | position, breaking a handle | pattern part and omitting a part. The state of shifting in the order of (a) to (c) is shown. It is explanatory drawing which shows typically the handle | steering-piece part of FIG. 1, and the front-end side part of a protection member, a part is abbreviate | omitted and a part is abbreviate | omitted, and it changes so that a guard part may warp, and it transfers from a protection posture It is a figure which shows the mode at the time of doing, Comprising: A mode that it transfers in order of (a)-(c) is shown. It is explanatory drawing which shows a mode that the engraving sword of FIG. 1 is made to contact the plane located in the downward side, and is a figure which shows a mode that the angle | corner which the virtual line extended along the longitudinal direction of a engraving sword and a plane make is variable, A mode that the angle | corner made in order of (a)-(c) was enlarged is shown. FIG. 11 is a diagram illustrating a state in which the angle formed by the imaginary line extending along the longitudinal direction of the engraving sword and the plane is further increased, following FIG. 10, in which the angle formed in the order of (a) and (b) is increased. Show. It is a figure which shows the protection member of FIG. 2, Comprising: (a) is the perspective view seen from the different direction, and is the figure which expanded a part, (b) is a top view which shows the enlarged part of (a). . It is a figure which shows the rear end side part of the 2nd pattern formation piece of FIG. 2, Comprising: (a) is a perspective view, (b) is a top view. In the engraving sword of FIG. 1, it is explanatory drawing which shows a mode at the time of moving a protection member to back side, and changing to a storage attitude | position, It is a figure which fractures | ruptures the rear end side of a handle | pattern part, and expands one part. And, a mode that shifts in order of (a) to (c) is shown. It is explanatory drawing which shows typically a mode that the durability test of a guard part is implemented with respect to the engraving knife of Example 1. FIG. It is a graph which shows the result of the durability test done with respect to Example 1, Comparative Example 1, and Comparative Example 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail.
In the following description, unless otherwise specified, the longitudinal direction of the engraving sword 1 is the front-rear direction, one end side in the longitudinal direction where the blade is located is the front side, and the other end side of the pair is the rear side.
Unless otherwise specified, the vertical direction in the following description is a direction orthogonal to the longitudinal direction of the engraving knife 1 and is the height direction in FIG.
Furthermore, unless otherwise specified, the width direction in the following description is a direction orthogonal to the above-described vertical direction and front-rear direction.

In addition, regarding the above vertical direction, the engraving sword 1 in the present embodiment is a flat sword, and it is assumed that the blade table is positioned on the side of the engraving object such as a wood engraving during normal use. . Therefore, the vertical direction of the engraving sword 1 of the present embodiment is the same as the vertical direction in a posture in which the blade surface is placed on the lower side. In other words, it is in the same direction as the up-down direction in the posture where the part located on the engraving object side during normal use is laid down as the lower side.
The “laying posture” here is a posture in which the front-rear direction is parallel to the horizontal plane.

As shown in FIG. 1, the engraving sword 1 of this embodiment has a structure including a handle portion 2, a blade body portion 3, and a protection member 4.
The engraving sword 1 has a protective posture (see FIG. 1A) in which the guard portion 6, which is a part of the protection member 4, covers the periphery of the blade body portion 3, and the guard portion 6 is inside the handle portion 2. The posture can be changed between the stored posture (see FIG. 1B). That is, by moving the operation part 7 exposed to the outside in the front-rear direction, the entire protection member 4 moves in the front-rear direction, and the guard part 6 moves in the front-rear direction accordingly. And the guard part 6 retreats from the circumference | surroundings of the blade body part 3 by setting it as an accommodation attitude | position. That is, the storage posture is a posture in which the periphery of the blade body portion 3 is opened.

As shown in FIG. 2, the handle portion 2 includes a first pattern forming piece 10 located on the upper side and a second pattern forming piece 11 located on the lower side, and these are overlapped and integrated. It is a part formed by.
The first pattern forming piece 10 is formed with a window portion 10a for exposing the operation portion 7. This window part 10a is a through-hole which penetrates the outer side surface (upper surface) and the inner side surface (lower surface) of the 1st pattern formation piece 10, and is a long hole extended in the front-back direction.

  As shown in FIG. 3, a blade body attaching portion 18 and a guide projection portion 19 are formed inside the handle portion 2. These are portions formed on the center side in the width direction in the internal space of the handle portion 2.

The blade body attaching portion 18 is a massive portion formed so as to connect the inner side surface (lower surface) of the first pattern forming piece 10 and the inner side surface (upper surface) of the second pattern forming piece 11, and has a planar view shape. It is a substantially rectangular parallelepiped shape, and is a portion extending in the front-rear direction.
An attachment hole for attaching the blade part 3 is formed on the front end surface of the blade attachment part 18. A handle side engaging recess 18 a is formed in the lower end side portion of the blade body attaching portion 18.

The handle-side engaging recess 18a is a portion that is recessed toward the inside in the width direction. In the present embodiment, one handle-side engaging recess 18a is formed in each of the one end portion and the other end portion in the width direction of the blade body attaching portion 18. In other words, the other handle side engaging recess 18a is formed at a position away from the one handle side engaging recess 18a in the width direction, and the lower end side portion of the blade body mounting portion 18 is wider than the upper portion thereof. The direction length is shorter.
The handle-side engagement recess 18 a functions as a guide portion when the protection member 4 moves by engaging with a part of the protection member 4.

The guide protrusion 19 is formed by two guide forming pieces 19a and 19b located behind the blade attachment 18.
The two guide forming piece portions 19a and 19b are both standing wall-like portions, are arranged at intervals in the width direction, and extend in the front-rear direction so as to be parallel to each other. The guide forming piece portions 19 a and 19 b protrude upward from the inner surface of the second pattern forming piece 11 and extend to a position away from the inner surface (lower surface) of the first pattern forming piece 10. That is, a space is formed between the upper end portions of the two guide forming piece portions 19 a and 19 b and the inner side surface (lower surface) of the first pattern forming piece 10.

That is, the handle portion 2 is a cylindrical body whose rear end side is closed, and the handle inner space 20 that is the inner space thereof is a space having an opening portion 20a on the front end side.
The inner space 20 can accommodate most of the protection member 4. Specifically, a portion located on one end side in the width direction with respect to the blade body attaching portion 18 and the guide projection portion 19, a portion located on the other end side in the width direction with respect to these, and above the guide projection portion 19. The portion to be positioned is a space for arranging and moving the protection member 4.

The blade body portion 3 is a plate-like portion formed of an appropriate metal such as steel, and the shape of the blade (blade edge) located at the front end portion is a flat shape extending in the width direction. That is, the engraving sword 1 of this embodiment is a so-called flat sword.
In addition, the blade of the blade body portion 3 is a portion that becomes a boundary between the upper surface and the lower surface of the blade body portion 3, and is a portion formed by processing the portion thinly and sharply. Therefore, the blade of the blade body part 3 is a very thin surface or side located on the front end side of the blade body part 3.

  The protective member 4 is a member formed using an appropriate resin as a raw material. In the present embodiment, the protective member 4 is a resin molded body formed using polyacetal and polyimide as main raw materials. For this reason, the protection member 4 is a member having flexibility (elasticity).

  As shown in FIG. 2, the protection member 4 includes a guard portion 6, a connecting portion 25, an internal sliding body 26, and an operation portion 7, which are integrally formed.

The guard portion 6 is a portion that is located in front of the front end of the handle portion 2 and exposed to the outside when in the protective posture (see FIG. 1A), and is connected to the two guard forming pieces 30 and 31. The structure has a piece 32.
If it demonstrates in detail, the guard part 6 will be integrally formed with the protection member 4, and will be a part which follows the front end side of the protection member 4, and continues in a semi-annular form. And the standing wall-shaped guard formation piece 30 located in the one end side of the width direction, the other guard formation piece 31 located in the other end side, and the guard which connects the front end sides of the two guard formation pieces 30 and 31 The connecting piece 32 is integrally formed, and the overall planar view shape is substantially U-shaped.
This guard part 6 is a characteristic part of this embodiment, and will be described in detail later.

The connection part 25 is a part formed by two connection piece parts 25a and 25b.
Each of the two connecting pieces 25a and 25b is a portion extending in the front-rear direction with a substantially “L” cross-sectional shape, and a part of the lower end side of the portion that becomes a standing wall is bent inward (inward in the width direction). It is like a shape. That is, the two connecting pieces 25a and 25b are portions extending so as to be parallel to each other at positions separated in the width direction, and are formed in a flat plate shape projecting toward each other at the lower end sides of the inner surfaces facing each other. The part of is formed.
Of the two connecting pieces 25a and 25b, one front end portion extends continuously and integrally with the rear end portion of one guard forming piece 30. The other front end portion extends continuously and integrally with the rear end portion of the other guard forming piece 31. Each rear end portion is continuous with the front end side portion of the internal sliding body 26.

The internal sliding body 26 has a structure including a top plate portion 26a and two standing plate portions 26b and 26c suspended downward from both ends in the width direction of the top plate portion 26a.
That is, on the lower side of the top plate portion 26a, an engagement recess 35 surrounded by the top plate portion 26a and two standing plate portions 26b and 26c that are spaced apart from each other in the width direction is formed. The engagement recess 35 is a recess into which the guide protrusion 19 can be inserted.

  The operation portion 7 has a structure including an operation protrusion 7a and a front side locking piece portion 7b, and these are integrally formed portions.

The operation protrusion 7a is a protrusion portion whose plan view shape is substantially oval (track shape).
Here, the “oval shape (track shape)” is a shape in which two short sides of a rectangle are replaced with semicircles.

  The front locking piece 7b has a shape including a flat plate-like portion protruding further forward from the vicinity of the front lower end portion of the operation protrusion 7a, and a protruding portion protruding upward near the protruding end of the flat plate-like portion. Yes.

Here, in the top plate portion 26a of the internal sliding body 26, through holes that penetrate the top plate portion 26a in the thickness direction (vertical direction) are formed at appropriate portions. And most of the front side of the operation part 7 is distribute | arranged to the position which overlaps with the through-hole of the top-plate part 26a by planar view. That is, only the rear end portion of the operation portion 7 is connected to the top plate portion 26a and is a portion that extends in a cantilever manner.
Therefore, when the operation projection 7a is pressed downward, the front locking piece 7b is also moved downward.

Here, the guard unit 6 will be described in detail.
As described above, the guard portion 6 is a portion in which the two guard forming pieces 30 and 31 and the guard connecting piece 32 are integrally formed (see FIG. 1A and the like).
Here, the two guard forming pieces 30 and 31 have the same shape, and are arranged so as to overlap in a plan view in which the line-of-sight direction is the width direction. These are opposed to each other in the width direction and extend so as to be parallel to each other.
In the following description, one guard forming piece 30 (first guard forming piece 30) will be described in detail, and the other guard forming piece 31 (second guard forming piece 31) having the same shape will be duplicated. The detailed description to be omitted is omitted.

As shown in FIG. 4, the guard forming piece 30 is a portion partitioned into a guard base end portion 38, a constricted portion 39, and a front end side portion 40 in order from the rear end side.
That is, in the guard forming piece 30, the guard base end portion 38 forms a rear end side portion, and the front end side portion is formed by the constricted portion 39 and the front end side portion 40. The distal end side portion extends from the front end of the guard base end portion 38 toward the front upper side.
And in the front end side part of the guard formation piece 30, the constriction part 39 which forms a rear side part is formed so that it may become thin compared with the most part of the front end side part 40 which forms a front side part.

  The guard base end portion 38 has a top surface that is parallel to the horizontal plane, and a front portion thereof becomes a portion that becomes thinner toward the front side.

The constricted portion 39 is a portion that becomes thinner toward the upper front side and becomes thicker from the narrowest portion to the upper front side. The rear end portion of the constricted portion 39 is located on the rear side in the front-rear direction as compared with the blade of the blade body portion 3. Furthermore, the front end portion of the constricted portion 39 has a front side position in the front-rear direction compared to the blade of the blade body portion 3.
The upper surface of the constricted portion 39 is a curved surface that is recessed in an oblique direction (downward on the front side).

  The distal end side portion 40 is a portion that is a curved surface that is rounded so that the upper surface is convex upward.

Here, the lower surface of the guard forming piece 30 extends from a portion on the lower surface of the guard base end portion 38 from the front side to a portion on the lower surface of the distal end side portion 40 through the lower surface of the constricted portion 39. A series of inclined surfaces extending gently are formed therebetween. And the curved surface part 45 is formed in the part located ahead rather than this inclined surface.
The curved surface portion 45 forms a curved surface extending from a portion of the lower surface of the distal end side portion 40 from the front side to the front end surface of the guard forming piece 30. That is, on the front end side of the guard forming piece 30, a curved surface is formed that extends from the front end side on the lower surface to the lower side on the front surface.

Here, the minimum value L1 of the thickness of the constricted portion 39 is preferably 1.5 mm or more and 4.0 mm or less, more preferably 1.5 mm or more and 3.0 mm or less, and 2.0 mm or more and 2. More preferably, it is 5 mm or less.
The “thickness of the constricted portion 39” is a distance from the upper surface to the lower surface of the constricted portion 39, and is a length in a direction orthogonal to the extending direction of the constricted portion 39 in a plan view with the width direction as the line-of-sight direction. It is. In addition, the “degree” here includes an error of several percent, and the same applies to the description to be described later.

  In addition, the minimum value L1 of the thickness of the constricted portion 39 is smaller than the minimum value of the thickness of the guard base end portion 38. Furthermore, in this embodiment, the minimum value L1 of the thickness of the constricted portion 39 is set to about 2.3 mm.

Furthermore, the distance L2 (see FIG. 4) in the front-rear direction from the front end portion of the guard portion 6 to the blade is preferably 4.0 mm or more and 8.0 mm or less, and preferably 6.3 mm or more and 7.52 mm or less. More preferably, it is 6.5 mm or more and 7.0 mm or less.
This distance L2 is also the length of the front-rear direction component of the line segment (imaginary line segment) connecting the front end portion of the guard 6 and the blade in a side view with the line-of-sight direction as the width direction. In other words, it is also the length of the front-rear direction (longitudinal direction of the engraving sword 1) component of the shortest line segment among the line segments (imaginary line segments) connecting the front end portion of the guard portion 6 and the blade.

  Moreover, when the shape of the blade is a so-called flat blade as in this embodiment, the distance L2 is preferably 4.0 mm or greater and 8.0 mm or less, and is 6.0 mm or greater and 7.0 mm or less. It is more preferable. In this embodiment, this distance L2 is set to about 6.59 mm.

Further, in a side view in which the line-of-sight direction is the width direction, the length L3 (see FIG. 4) of the line segment when the blade and the guard portion 6 are connected by a line segment (virtual line segment) extending in the vertical direction is 1 It is preferably 0.0 mm or more and 3.0 mm or less. Moreover, it is more preferable that they are 1.25 mm or more and 1.37 mm or less, and it is further more preferable that they are 1.30 mm or more and 1.35 mm or less.
The length L3 is also the distance from the portion of the guard portion 6 located immediately above the blade to the blade in a side view with the line-of-sight direction as the width direction.

  Moreover, when the shape of the blade is a so-called flat blade as in this embodiment, the length L3 of the line segment is preferably 1.0 mm or more and 3.0 mm or less, and 1.0 mm or more and 2. More preferably, it is 0 mm or less. In this embodiment, the length L3 of this line segment is set to about 1.26 mm.

  Here, as shown in FIG. 5, the guard connecting piece 32 is a part that connects the end portions in the protruding direction of the two guard forming pieces 30 and 31 (one is not shown in FIG. 5), 6 forms most of the front end face and the upper end face.

And the distance L4 (refer FIG. 5) in the up-down direction from the lower surface of the guard connection piece 32 to a blade is preferable 2.0 mm or more and 5.0 mm or less, and it is 2.5 mm or more and 4.5 mm or less. More preferably, it is 3.0 mm or more and 4.0 mm or less.
The distance L4 is also the length of the vertical component of a line segment (virtual line segment) connecting the lower surface of the guard coupling piece 32 and the blade in a side view where the line-of-sight direction is the width direction.
In this embodiment, this distance L4 is set to about 3.67 mm.

Furthermore, the average value of the cross-sectional secondary moment of the cross section of the constricted portion 39 is preferably 100 mm ⁴ or more and 300 mm ⁴ or less, more preferably 150 mm ⁴ or more and 250 mm ⁴ or less, and 160 mm ⁴ or more and 200 mm ⁴ or less. More preferably it is.
Here, the “transverse section” is a section cut in a direction perpendicular to the extending direction (thickness direction of the constricted portion 39).

Here, the cross section at the front end portion of the guard base end portion 38 (see FIG. 6A) is the portion of the cross section of the guard base end portion 38 where the value of the moment of inertia of the cross section is minimized. . The value of the cross-sectional secondary moment at this front end portion is about 405.35 mm ⁴ .
That is, the average value of the cross-sectional secondary moment of the cross section of the constricted portion 39 is lower than the value of the cross-sectional secondary moment at the front end portion of the guard base end portion 38.
Further, the cross section (see FIG. 6B) at the narrowest portion of the constricted portion 39 is a portion where the value of the secondary moment of the cross section is the smallest in the cross section of the constricted portion 39. The value of the cross-sectional secondary moment at this portion is about 181.98 mm ⁴ .

In this embodiment, by forming the blade body part 3 and the guard part 6 as described above, the guard part 6 is bent and deformed even if force is applied to the guard part 6, and the guard part 6 is not easily damaged.
More specifically, as shown in FIG. 7, the engraving sword 1 has a posture in which the guard portion 6 is erected downward in the protective posture, and is moved vertically downward to be pressed against the lower plane. In this case, the guard portion 6 is not damaged even if it is pressed until the blade hits a flat surface.
Here, the “upright posture” is a posture in which the longitudinal direction (the front-rear direction) of the engraving knife 1 is the vertical direction.

That is, the engraving knife 1 of the present embodiment can be deformed so that the front end portion of the guard portion 6 is warped upward (left side in FIG. 7). And, when deformed in this way, the front end portion of the guard portion 6 after deformation and the blade of the blade body portion 3 are in the same state in the front-rear direction (the state shown in FIG. 7B) In FIG. 7, the vertical direction can be set.
And even if it deform | transforms the guard part 6 to such a state, the guard part 6 will be in an original shape by making the guard part 6 into a natural state (a state where an external force is not applied and a state separated from a plane). It is supposed to return.
As described above, when the engraving knife 1 deforms the guard portion 6 within the elastic range, the front end portion of the deformed guard portion 6 and each of the blades are on the same plane (perpendicular to the longitudinal direction of the engraving blade 1). It can be located on a virtual plane). More specifically, an elastic deformation that can be further slightly warped from this state is possible.

That is, when the user uses the engraving sword 1 with a posture and usage different from normal and an unreasonable force is applied to the guard portion 6 due to this, other objects (for example, a plywood surface to be engraved, There is a high possibility that it is pressed against the top plate of the desk.
So, in this embodiment, even if the guard part 6 is pressed against a certain surface, the guard part 6 bends and deforms, and as a result, a part different from the guard part 6 (blade etc. of the blade body part 3) makes this contact. The structure is in contact with the surface. Thus, a certain amount or more of deformation of the guard portion 6 is prevented, and the guard portion 6 is prevented from being damaged (suppressed). In addition to the upright posture as described above, this is a posture in which the engraving sword 1 is inclined with respect to the contact surface (the angle between the imaginary line extending in the longitudinal direction of the engraving sword 1 and the contact surface is 90 degrees or less. The same applies to the case of pressing as a posture.

Further, in addition to the above-described deformation in which the upper end of the guard portion 6 is warped, elastic deformation in which the upper end of the guard portion 6 moves downward is also possible.
That is, even when the engraving sword 1 is upside down and the engraving sword 1 is inclined with respect to the contact surface and the vicinity of the blade edge is pressed against a flat surface, the guard portion 6 is deformed and the blade body portion 3 is in contact with the flat surface. It has a structure to do.
Note that the maximum deformation amount within the elastic range of deformation in which the upper end of the guard portion 6 moves downward is smaller than the maximum deformation amount within the elastic range of deformation that moves upward.

  However, even the engraving sword 1 formed as described above may be deformed beyond the elastic range for some reason when the front end portion of the guard portion 6 is deformed to warp upward. It is done.

  Therefore, the engraving knife 1 of the present embodiment has a structure that can restore the guard portion 6 to the original shape (or a shape close to the original shape) by shifting from the protective posture to the retracted posture. Yes. That is, even if the guard portion 6 is plastically deformed so as to warp upward, it can be restored to its original shape.

  First, the engraving sword 1 in a normal state will be described. In the present embodiment, as shown in FIG. 8, the upper end portion of the guard portion 6 is located below the upper end portion of the handle inner space 20. For this reason, the guard portion 6 does not come into contact with the front end surface of the handle portion 2 when the engraving sword 1 is shifted from the protective posture to the retracted posture.

And in the front end side part of the interior space 20, the shape of the inner peripheral surface upper part is a shape which follows the upper surface of the guard part 6 substantially, Comprising: It is a curved surface used as a gentle downward slope toward the back side. .
Therefore, as shown in FIG. 8C, when the engraving sword 1 is in the storage position, the inner surface of the first pattern forming piece 10 located above the guard portion 6 and the upper surface of the guard portion 6 are: A part is in contact, and the other part is in a state of being opposed to be separated. And in the part which is opposingly spaced, the space | interval of the inner surface of the 1st pattern formation piece 10 in each part and the upper surface of the guard part 6 is substantially the same.
This interval is 10% or less of the length of the guard portion 6 in the vertical direction and is a minute interval of several mm (for example, 3 mm) or less, and in this embodiment, is 1 mm or less.

  On the other hand, as shown in FIG. 9A, when the upper end portion of the guard portion 6 is plastically deformed so as to be warped, the upper end portion of the guard portion 6 is higher than the upper end portion of the handle inner space 20. Will be located. That is, as described above, the guard portion 6 can be elastically deformed so that the front end portion after the deformation and the blade have the same position in the front-rear direction. For this reason, when the guard portion 6 is deformed so as to warp beyond the elastic range, the upper end portion of the guard portion 6 is necessarily positioned above the upper end portion of the handle inner space 20.

In this state, when the engraving sword 1 is shifted from the protection posture to the storage posture, the upper end portion of the guard portion 6 comes into contact with the front end surface of the handle portion 2 as shown in FIG.
And if operation which moves the guard part 6 back is implemented as it is, the guard part 6 will be in the state pressed against the front-end surface of the handle | pattern part 2, or the inner peripheral surface upper part, and also it is back with respect to the guard part 6. The power to go is added. For this reason, the guard portion 6 is subjected to a force in a direction in which the warp is corrected by the reaction force received from the handle portion 2.

  Furthermore, the engraving sword 1 of this embodiment forms the blade body part 3 and the guard part 6 as described above, so that when engraving an object to be engraved such as a woodcut, It can be brought into contact with the object to be engraved in a posture (angle) that is easy to do. In other words, the engraving sword 1 of the present embodiment regulates the contact angle of the blade in the protective posture so that the blade does not contact the engraved object at an angle that is difficult to carve.

That is, as shown in FIGS. 10 and 11, when the blade of the engraving knife 1 is brought into contact with the plane (target surface) located on the lower side, the plane and the virtual line extending along the longitudinal direction of the engraving knife 1 are formed. Only when the angle α is within a predetermined range, the blade contacts the plane.
This predetermined range (range of the angle α formed) is preferably 15.0 degrees or more and 40.0 degrees or less, and particularly preferably 15.0 degrees or more and 35.0 degrees or less. The angle is more preferably 16.05 degrees or more and 31.68 degrees or less, and further preferably 20.0 degrees or more and 30.0 degrees or less.

  When the blade shape is a so-called flat blade as in the present embodiment, the range of the angle α is preferably 17.16 degrees or more and 30.26 degrees or less, and preferably 20.0 degrees or more. More preferably, it is 30.0 degrees or less. In the present embodiment, the predetermined range is 17.16 degrees or more and 30.26 degrees or less.

Here, the range of the angle α formed is a range determined based on a sensory test or the like performed in advance.
Specifically, as a result of conducting sensory tests on various people by the present inventors, when the angle α formed exceeds 40.0 degrees, the majority of people are difficult to work. It turns out to feel.
Also, when the angle α formed is set to a posture where the angle α is lower than 15.0 degrees, there is a problem that the cutting edge slides on the surface, and it is difficult to work easily compared to the case where the angle α is set to 15.0 degrees or more. I found out that
When the angle α formed is in the range of 15.0 degrees or more, when the formed angle α is 35.0 degrees or less, many people feel that work is easier than when the angle α exceeds 35.0 degrees. Turned out to be. Furthermore, it has been found that when the angle α formed is in the range of 20.0 degrees or more and 30.0 degrees or less, the majority of people feel that the work is easier to perform.
Further, the range of the angle α formed is a range in the case where the guard portion 6 maintains the shape (normal shape) in the natural state, and naturally, the guard portion 6 is bent by force. This is not the case.

  Based on the test results, in the engraving sword 1 of the present embodiment, when the formed angle α is less than 17.16 degrees, as shown in FIG. The blade is prevented from contacting the target surface.

  When the angle α is within the above range, the blade contacts the target surface as shown in FIGS. 10B, 10C, and 11A. In the postures shown in FIGS. 10 (b), 10 (c), and 11 (a), the angles α formed are 17.16 degrees, 22.0 degrees, and 30.26 degrees, respectively. .

Here, as shown in FIGS. 10B and 10C, the engraving sword 1 of the present embodiment has the guard portion 6 as the target surface in most cases when the angle α formed is within a preferable range. It has a structure that does not come into contact with. For this reason, the guard portion 6 is preferable because it does not disturb the engraving work.
Furthermore, as shown in FIG. 11A, even when the blade and the guard portion 6 are in contact with the target surface, the curved surface portion 45 is formed as described above, and the guard portion 6 and the target surface The contact area can be reduced. For this reason, when the blade is moved while being in contact with the target surface, the guard portion 6 is preferable without hindering the movement of the blade.

  Furthermore, when the angle α formed exceeds 30.26 degrees, as shown in FIG. 11B, the guard portion 6 prevents the blade from contacting the target surface, and the blade does not contact the target surface. It has become.

  Therefore, when the engraving sword 1 is placed on a flat surface and the engraving sword 1 is erected so that the value of the angle α is gradually increased, the angle α formed becomes 17.16 degrees. In the state, the blade contacts the flat surface. The blade remains in contact with the plane until the angle α is 30.26 degrees as it is, and when the angle α exceeds 30.26 degrees, the blade is separated from the plane.

  That is, in the engraving sword 1 of this embodiment, the contact angle of the blade can be regulated by the handle portion 2 and the guard portion 6. In other words, the guard portion 6 of the present embodiment functions not only as a protective member that protects the user's finger or the like, but also as a regulating member that regulates the contact angle of the blade.

Here, as described above, the guard portion 6 of the present embodiment is capable of being deformed by a certain amount or more when unexpectedly strong force is applied, and has a structure that prevents or suppresses damage to the guard portion 6 by deformation. It has become. For this reason, it is necessary to lower the elastic modulus above a certain level and widen the elastic range above a certain level.
On the other hand, since the guard portion 6 also functions as a regulating member that regulates the contact angle, it is necessary that the guard portion 6 be not deformed to the extent that light force is applied. For this reason, it is necessary to make the elastic modulus higher than a certain level.
Therefore, the guard portion 6 of the present embodiment is formed as described above, and has a higher elastic modulus than that formed from rubber or the like, and a member having an appropriate elastic modulus and a wide elastic range. It has become. That is, using the above-described main raw material and setting it in the above-described range of L1 is preferable in achieving both strength and safety.
Further, by setting the ranges of L2, L3, and L4 as described above, it is possible to restrict the angle as described above, and to keep the blade sufficiently hidden while preventing the guard portion from becoming an obstacle during work. That is, it is preferable in order to achieve both safety and good usability.

  By the way, the engraving sword 1 of this embodiment has a structure in which the state of the protection posture and the storage posture are maintained by the engagement of the handle 2 and the protection member 4.

More specifically, the front locking piece 7b (see FIG. 2) of the protection member 4 is engaged with a recess (not shown) formed on the inner side surface (lower surface) of the first handle forming piece 10. The structure is such that the protective posture is maintained.
That is, the front locking piece 7b and the recess are portions that function as a first posture maintaining portion for maintaining the protective posture, and are engaged when the protective posture is engaged, and the protective member 4 is moved. And the disengaged state during the storage posture.

  On the other hand, a rear side engaging protrusion 50 (see FIG. 12) formed on the rear side of the protective member 4 and a handle side engaging protrusion 53 (see FIG. 13) formed on the second pattern forming piece 11 are formed. It is a part that functions as a second posture maintaining unit for maintaining the storage posture.

As shown in FIG. 12, the rear engagement protrusion 50 is a protrusion-like portion formed on each of the two standing plate portions 26 b and 26 c of the protection member 4.
Here, the two standing plate portions 26b and 26c are each formed with a groove portion 51 at a position slightly ahead of the rear end portion. In other words, each of the two standing plate portions 26b and 26c is a wall-like portion in which a part on the rear end side is missing.

  The groove 51 is a notched groove-like portion extending from the lower end (upper end in FIG. 12) to the upper end of the standing plate portions 26b and 26c, and penetrates the standing plate portions 26b and 26c in the thickness direction. That is, the groove 51 divides the upright plate portions 26b and 26c into most of the front side and a part of the rear end side.

A rear engagement protrusion 50 is formed on the inner surface of a portion of the rear end side of the standing plate portions 26b and 26c. That is, the rear engagement protrusion 50 is formed at a position on the rear side of the groove portion 51.
The rear engagement protrusion 50 is a protrusion-like part formed so as to protrude inward in the width direction, and has a rounded shape on the protruding end side. In other words, the rear engagement protrusion 50 is a protrusion-like portion extending in the vertical direction with a substantially semicircular shape in plan view.

Here, the two groove portions 51 formed on the two standing plate portions 26b and 26c are the same groove-shaped portions, and are spaced apart from each other in the width direction (the width direction of the engraving blade 1 and the internal sliding body 26). Are formed respectively. That is, each of the two groove portions 51 has the same position in the front-rear direction.
Further, the two rear engagement protrusions 50 are the same shaped protrusion-like portions, are formed at positions facing each other in the width direction, and protrude in a direction approaching each other. Therefore, the positions of the two rear engagement protrusions 50 are also the same in the front-rear direction.

  As shown in FIG. 13, the handle-side engaging protrusion 53 is a protruding portion formed on the guide protruding portion 19, and is formed on each of the two guide forming piece portions 19 a and 19 b, both of which are guide forming piece portions. It protrudes further outward from the outer surface in the width direction of 19a, 19b.

Each of the handle-side engaging protrusions 53 has a substantially semicircular shape in plan view and extends in the vertical direction, and is formed slightly forward from the rear end.
That is, the two handle-side engagement protrusions 53 have the same shape, are formed at positions facing each other in the width direction, and protrude in directions away from each other. That is, each of the two handle-side engagement protrusions 53 has the same position in the front-rear direction.

  When the engraving sword 1 is shifted from the protection posture to the storage posture, as shown in FIG. 14A, when the protection member 4 is moved to the rear side (right side in FIG. 14), The rear side engaging protrusions 50 are in contact with different handle side engaging protrusions 53 from the front side.

Specifically, in the engraving sword 1 of the present embodiment, the protection member 4 is moved in the front-rear direction with the guide protrusion 19 fitted in the engagement recess 35 (see FIG. 2, FIG. 12, etc.) of the protection member 4. It is made to move to.
That is, the structure in which the operation protrusion 7a is inserted into the window 10a and the structure in which the guide protrusion 19 is inserted into the engagement recess 35 is used to restrict the movement of the protective member 4 in the left-right direction.
That is, both the set of the window portion 10a and the operation projection 7a and the set of the engagement recess 35 and the guide projection portion 19 also function as a guide portion when the protection member 4 is moved in the front-rear direction.

Here, by inserting the guide protrusion 19 into the engaging recess 35, as shown in FIG. 14, the two guide forming pieces 19a and 19b are positioned between the two standing plates 26b and 26c. It has become.
That is, the outer side surface in the width direction of one guide forming piece portion 19a and the inner side surface in the same direction of one standing plate portion 26b are in a state of being opposed to each other with a fine spacing. Furthermore, the outer side surface of the other guide forming piece 19b and the inner side surface of the other upright plate portion 26c are also in a state of being opposed to each other with a fine spacing.

Therefore, when the protective member 4 is moved rearward, one rear engagement protrusion 50 comes into contact with one handle side engagement protrusion 53 from the front, and the other rear engagement protrusion 50 moves to the other. It will be in the state contact | abutted from the front on the handle | side handle | engagement protrusion 53 (refer Fig.14 (a)).
Then, by further moving the protection member 4 to the rear side from this state, each of the two rear engagement protrusions 50 is in a state of being positioned on the outer side in the width direction of the two handle side engagement protrusions 53. (See FIG. 14 (b)).

That is, as described above, the groove portions 51 are formed in the two guide forming piece portions 19a and 19b (see FIG. 12), and elastic deformation is possible in which parts on the rear end side move in directions away from each other. It has become. Furthermore, as described above, both the rear side engaging protrusion 50 and the handle side engaging protrusion 53 have a rounded shape.
For this reason, when the rearward engagement protrusion 50 is in contact with the handle-side engagement protrusion 53 from the front and a force toward the rear side is further applied to the protection member 4, the rear-side engagement protrusion 50 is It will move so that it may get over the handle-side engaging protrusion 53 while maintaining the state in contact with the mating protrusion 53.

That is, the rear side engagement protrusion 50 changes from a state positioned in front of the handle side engagement protrusion 53 to a state positioned outside the handle side engagement protrusion 53 (outside in the width direction of the engraving knife 1). It will be in the state which got on the engagement protrusion 53. FIG.
In other words, the rear end portions of the two guide forming piece portions 19a and 19b are elastically deformed so as to move away from each other, and the rear end side portions of the two guide forming piece portions 19a and 19b are opened more than usual. It becomes a state. Then, one rear engagement protrusion 50 is positioned on the outer side in the width direction than one handle side engagement protrusion 53, and the other rear side engagement protrusion 50 is more than the other handle side engagement protrusion 53. It will be in the state located in the outer side in the width direction (refer FIG.14 (b)).

  Furthermore, by moving the protection member 4 to the rear side, the two rear side engagement protrusions 50 get over the different handle side engagement protrusions 53 and are positioned behind the handle side engagement protrusions 53 ( 14 (c)), it shifts to the storage posture.

In this state, the protection member 4 is locked by the two handle-side engagement protrusions 53, and the two handle-side engagement protrusions 53 are protected unless the protection member 4 is moved forward by a force of a certain level or more. The movement of the member 4 to the front side is prevented. That is, the two handle-side engaging projections 53 function as stoppers to prevent the two rear-side engaging projections 50 from moving forward, thereby causing an unintentional posture change from the storage posture to the protective posture. Is blocked.
When changing from the stowed position to the protective position, the protective member 4 is moved to the front side with a certain force or more, so that the two rear engagement protrusions 50 move in the opposite direction, and the handle side Get over the engagement protrusion 53 from the rear side.

  In the above-described embodiment, the example of restricting the range of the angle α formed by the handle portion 2 and the guard portion 6 has been shown. However, the shape of the guard portion 6 is changed, and the range of the angle α formed only by the guard portion 6 is restricted. May be.

In the above-described embodiment, the example in which the engraving sword 1 is a flat sword has been described, but the shape of the blade body part 3 may be changed as appropriate. That is, the shape is not limited to a so-called flat sword, and may be a shape called a so-called stamp sword (cutout sword), a round sword, a shallow sword, a triangular sword, a flat sword, a round curved sword, or the like.
When the blade has a shape extending in the direction including the front-rear direction component as in the so-called stamp, the position of the blade in the front-rear direction at the distance L2 and the like is the front end portion.
In addition, when the blade has a shape that extends in the direction including the vertical component, as in a so-called triangular sword, the position in the vertical direction of the blade at the above-described line segment length L3 is the lower end portion. And

  Here, the engraving sword 1 of the above-described embodiment assumes that the blade table is positioned on the engraving object side during normal use. However, for example, an engraving sword having a blade shape called a so-called stamp sword assumes that the blade back is positioned on the engraving object side during normal use. That is, the engraved sword to be formed is not limited to the one in which the blade surface is located on the lower side as in the above-described embodiment, and the blade back may be located on the lower side.

In addition, when the shape of the blade is a so-called triangular sword, the above-described distance L2 is preferably 4.0 mm or more and 8.0 mm or less, and more preferably 6.0 mm or more and 7.0 mm or less.
Furthermore, the distance L2 is particularly preferably about 6.3 mm.

  Further, when the shape of the blade is a so-called triangular sword, the length L3 of the above-described line segment is preferably 1.0 mm or more and 3.0 mm or less, and more preferably 1.0 mm or more and 2.0 mm or less. preferable. Further, the length L3 of the line segment is particularly preferably about 1.25 mm.

  Moreover, when the shape of the blade is a so-called triangular sword, the range of the angle α is preferably 15 degrees or more and 40 degrees or less, and more preferably 21 degrees or more and 31.68 degrees or less.

In addition, when the shape of the blade is a so-called round sword, the above-described distance L2 is preferably 4.0 mm or more and 8.0 mm or less, and more preferably 6.0 mm or more and 7.0 mm or less.
Furthermore, the distance L2 is particularly preferably about 6.79 mm.

  Further, when the shape of the blade is a so-called round sword, the length L3 of the above-mentioned line segment is preferably 1.0 mm or more and 3.0 mm or less, and more preferably 1.0 mm or more and 2.0 mm or less. preferable. Furthermore, it is particularly preferable that the length L3 of the line segment is about 1.37 mm.

  In addition, when the shape of the blade is a so-called round sword, the range of the angle α is preferably 15 degrees or more and 40 degrees or less, and more preferably 17.25 degrees or more and 29.78 degrees or less. .

In addition, when the shape of the blade is a so-called small round sword, the above-described distance L2 is preferably 4.0 mm or more and 8.0 mm or less, and more preferably 6.0 mm or more and 8.0 mm or less.
Furthermore, the distance L2 is particularly preferably about 7.52 mm.

  Further, when the shape of the blade is a so-called small round sword, the length L3 of the above-described line segment is preferably 1.0 mm or more and 3.0 mm or less, and more preferably 1.0 mm or more and 2.0 mm or less. preferable. Further, the length L3 of the line segment is particularly preferably about 1.33 mm.

  Further, when the shape of the blade is a so-called small round sword, the range of the angle α is preferably 15 degrees or more and 40 degrees or less, and more preferably 16.05 degrees or more and 29.77 degrees or less. .

Then, the Example and comparative example of this invention are demonstrated.
As an example and a comparative example, the durability test was implemented with respect to the engraving sword according to the above-described embodiment and the commercially available engraving sword, and the durability performance of the guard part was compared.
Example 1

An engraving sword according to the above-described embodiment was created and a durability test was performed.
In the test, as shown in FIG. 15, the guard portion was placed upright and the lower end portion was fixed with a vise. That is, the sword was fixed so that the front-rear direction is in the vertical direction. Further, as shown in FIG. 15, the lower end surface of the sensor is brought into contact with the front end portion (upper end portion at the start of the test) of the guard portion, and the lower end surface is moved downward at a speed of 50 mm / min, The bending strength and bending strength were measured.
The lower end surface of the sensor was a surface parallel to the horizontal plane. Furthermore, the area of the lower end surface of the sensor was set to an area sufficiently larger than the plan view area of the engraving sword in an upright posture, and the test was started from a state in which the guard portion was in contact with the vicinity of the center.
The measurement was terminated when the lower end surface of the sensor was in contact with the blade.

The relationship between the moving distance of the front end portion of the guard part until the end of the measurement and the load applied to the guard part is as shown in the graph of FIG. Further, when the engraving sword was brought into a natural state after the test was completed, the guard portion was restored to the original shape.
In this durability test, the shape of the guard portion is deformed so as to be warped, whereas the load is always applied to the lower side in the vertical direction. For this reason, the maximum value of the load (about 4.5 kgf) is measured when the moving distance is about 3 mm in spite of the deformation within the elastic range, and then measured even if the moving distance increases. The load value does not change greatly.
Accordingly, the substantial strength is equal to or greater than the point A corresponding to the movement distance when the blade strikes on the line segment in which the inclination of the graph at the initial stage of the experiment is extended as it is.
(Comparative Example 1)

A sword with a commercially available protective member was prepared. And the endurance test similar to Example 1 was implemented with the part of the protective member covering the periphery of the blade.
The result of the test was as shown in the graph of FIG. Further, when the moving distance was about 4.5 mm, the maximum load value (about 6.6 kgf) was measured (see point B in the figure), and the protective member was broken and damaged. That is, the protective member was broken and damaged before the blade contacted the sensor.
(Comparative Example 2)

A sword with a commercially available protective member, and a sword with a different manufacturer and shape from Comparative Example 1 were prepared. And the endurance test similar to Example 1 was implemented with the part of the protective member covering the periphery of the blade.
The result of the test was as shown in the graph of FIG. In the engraving sword of Comparative Example 2, when the protective member was deformed until the blade contacted the sensor, the protective member was plastically deformed and could not be restored.

DESCRIPTION OF SYMBOLS 1 Engraving sword 2 Handle part 3 Blade part 4 Protection member 20 Interior space 20a Opening part 30,31 Guard formation piece 32 Guard connection piece 38 Guard base end part 39 Constriction part 40 Tip side part 45 Curved surface part α Angle formed

Claims (11)

A sword that includes a handle portion, a blade portion attached to the handle portion, and a protection member, and can be used by bringing a blade formed on the blade portion into contact with a target surface,
The protective member has a guard portion that can be disposed at least around the blade body portion,
The guard portion can be in a protective posture located around the blade,
In the protective posture, it is possible to bring the blade into contact with the target surface by setting the longitudinal direction of the handle portion to a direction inclined with respect to the target surface and setting the posture inclined at a predetermined angle.
At least the guard part regulates the range of the angle at which the blade and the target surface can come into contact with each other,
The sculpture is characterized in that the blade contacts the target surface when an angle formed by an imaginary line extending in the longitudinal direction of the handle portion and the target surface is in a range of 15 degrees to 40 degrees in the protective posture. sword. When the blade body side is the front side with the longitudinal direction of the handle as the front-rear direction,
The distance in the front-rear direction from the front end portion of the guard portion to the blade in the protective posture is L2,
The length of the imaginary line segment when connecting the blade and the guard part with a phantom line segment extending in the vertical direction in the state where the protection posture is set and the front-rear direction is parallel to the horizontal plane is L3. When
The engraving sword according to claim 1, wherein the L2 is 4.0 mm or greater and 8.0 mm or less, and the L3 is 1.0 mm or greater and 3.0 mm or less. The longitudinal direction of the handle is the front-rear direction and the blade body side is the front side,
When one end side in a direction orthogonal to the front-rear direction, the target surface side in the state where the blade is in contact with the target surface as the protective posture, and the opposite side is the upper side,
The lower end of the handle portion is located below the lower end of the guard portion,
The engraved sword according to claim 1 or 2, wherein a portion of the lower end portion of the handle portion which is a front end side periphery also regulates the range of the angle. The longitudinal direction of the handle is the front-rear direction and the blade body side is the front side,
When one end side in a direction orthogonal to the front-rear direction, the target surface side in the state where the blade is in contact with the target surface as the protective posture, and the opposite side is the upper side,
The guard portion includes two guard forming pieces and a guard connecting piece extending by connecting the front end sides of the two guard forming pieces, and the front end and both side ends of the blade body portion in the protection posture. It extends continuously in a semicircular shape on the outside,
The guard forming piece is a portion extending in the front-rear direction on the lateral outer side of the blade body portion in the protection posture,
The engraving sword according to any one of claims 1 to 3, wherein a curved surface extending from the lower surface to the front surface is formed on a front end side of the guard forming piece. The longitudinal direction of the handle is the front-rear direction and the blade body side is the front side,
When one end side in a direction orthogonal to the front-rear direction, the target surface side in the state where the blade is in contact with the target surface as the protective posture, and the opposite side is the upper side,
The guard part has two guard forming pieces,
In the protective posture, the blade body portion is positioned between the two guard forming pieces, and the guard forming piece extends in the front-rear direction on the lateral outer side of the blade body portion,
The guard forming piece has a rear end side portion extending in the front-rear direction and a front end side portion extending in the direction going upward as it goes forward.
The front end side portion of the guard forming piece is formed with a constricted portion which is a constricted portion than other portions, and the front end side portion of the guard forming piece can be elastically deformed. The engraving sword according to any one of claims 1 to 4.   6. The engraved sword according to claim 5, wherein the constricted portion is formed at a portion from a rear end of a tip side portion of the guard forming piece. The average value of the cross-sectional secondary moment of the cross section of the constricted portion is 100 mm ⁴ or more and 300 mm ⁴ or less, and is smaller than the minimum value of the cross-sectional secondary moment of the cross section in the rear end side portion of the guard forming piece. The engraving sword according to claim 5 or 6, characterized by the above.   The rear end portion of the constricted portion is located on the rear side in the front-rear direction with respect to the blade, and the front end portion of the constricted portion is located on the front side in the front-rear direction with respect to the blade. The engraving sword according to any one of claims 5 to 7. The handle portion is formed with a handle inner space in which at least a part of the guard portion can be stored.
The inner space of the handle has an opening portion on the front side of the handle portion, and the upper end portion of the opening portion is positioned slightly above the upper end portion of the guard portion, or the guard Is formed so that the upper end portion of the portion and the vertical position are the same,
The protective member is attached to be movable relative to the handle portion,
By moving the protection member, it is possible to switch between the protection posture and a storage posture in which at least a part of the guard portion is stored in the handle internal space,
In the stowed posture, each part of the upper surface of the guard part located in the inner space of the handle and the upper surface of the inner space of the handle face each other with a slight gap or are in contact with each other. The engraving sword according to any one of claims 5 to 8. The protective member is a resin molded body formed using polyacetal and polyamide as main raw materials,
The engraving sword according to any one of claims 1 to 9, wherein the guard portion is integrally formed with the protective member. A sword with a handle, a blade attached to the front end of the handle, and a protective member;
The protective member has a guard portion that can be disposed at least around the blade body portion,
A blade is formed on the blade body,
The guard portion can be in a protective posture located around the blade,
The distance in the front-rear direction from the front end portion of the guard portion to the blade in the protective posture is L2,
When the protective posture is set, the front-rear direction is parallel to the horizontal plane, and the length of the virtual line segment when the blade and the guard portion are connected by a virtual line segment extending in the vertical direction is L3,
The L2 is 4.0 mm or more and 8.0 mm or less, and the L3 is 1.0 mm or more and 3.0 mm or less.

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