Manual tool and joining method of manual tool

Abstract

To provide a manual tool in which a head is joined to a handle, which is configured so that the handle is prevented from being broken.SOLUTION: A manual tool, which is formed in a lengthy shape, comprises a head, provided on a tip side of the tool, which acts on an object, a handle, provided on a base end side of the tool, which operates the head, and a joining structure, interposed between a base end side of the head and a tip side of the handle to join the head to the handle. The joining structure has a groove formed on an end face of an end part of either of the head and the handle and a convex part formed in a convex shape on an end face of an end part of the other of the head and the handle. When the convex part is fitted to the groove, the head is joined to the handle.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a manual tool and a method for joining the manual tool.

Background Art

[0002] Conventionally, there is a manual tool including a head that acts on an object and a handle that operates the head, which is configured to be lightweight by using a material lighter than the head for the handle while ensuring mechanical strength.

[0003] For this type of manual tool, as shown in Patent Document 1, for example, the head is made of a steel alloy, and the handle is made of carbon fiber or glass fiber lighter than the head. This realizes weight reduction while ensuring the mechanical strength of the head.

[0004] By the way, in the above manual tool, since the handle and the head are joined by applying carbon fiber to the surface of the head, the handle cannot be replaced.

[0005] Therefore, in order to make the handle replaceable, it is considered to join the handle and the head with a split pin. In this case, it is necessary to drill a hole for the split pin in the handle. As a result, when the handle is made of a material having a fiber lamination direction such as carbon fiber, the handle may crack.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, the present invention has been made to solve the above-described problems, and in a manual tool for joining a head and a handle, its main problem is to prevent breakage of the handle.

Means for Solving the Problems

[0008] That is, the manual tool according to the present invention is a manual tool having a long shape, provided on the tip side, a head that acts on an object, provided on the base end side, a handle that operates the head, and is interposed between the base end side of the head and the tip side of the handle, and includes a joining structure that joins the head and the handle. The joining structure has a groove formed on the end face of one end of the head or the handle, and a convex portion formed in a convex shape on the end face of the other end of the head or the handle. The head and the handle are joined by fitting the convex portion into the groove.

[0009] According to the manual tool configured in this way, since the head and the handle are joined by fitting the convex portion into the groove, the head and the handle can be replaced, and compared with the case where the head and the handle are joined by, for example, a split pin, there is no need to process the handle such as making a hole for the split pin. As a result, it is possible to prevent breakage of the handle such as the occurrence of cracks in the handle due to the formation of a hole for the split pin.

[0010] Here, when the materials of the head and the handle are different, in order to ensure mechanical strength, the head needs to be made of a material with higher strength than the handle. And when the handle is rotated around the rotation axis to operate the head, breakage is likely to occur at the joint portion. In particular, when the groove is formed in the handle, in order to prevent breakage of the joint portion, it is necessary to increase the thickness of the handle, which makes the entire manual tool heavier and makes it difficult for the operator to hold the handle. Therefore, the manual tool rotates the handle around a rotation axis, which is a direction intersecting the longitudinal direction of the manual tool, to operate the head. The groove is formed on an end face on the proximal end side of the head and extends along the rotation axis. The convex portion is formed on the distal end side of the handle. It is preferable that the head and the handle are joined by fitting the convex portion into the groove along the rotation axis.

[0011] With such a configuration, since the groove is formed in the head and extends along the rotation axis, when the strength of the material constituting the groove is greater than the strength of the material constituting the convex portion, even if the handle is rotated around the rotation axis to operate the head, it is possible to prevent the joint portion from being damaged. In addition, since it is not necessary to increase the thickness of the handle, the entire manual tool can be made lighter compared to the case where the groove is formed in the handle, and it becomes easier for the operator to hold the handle.

[0012] Preferably, the joining structure further includes a longitudinal fixing mechanism that fixes the groove and the convex portion with respect to the longitudinal direction of the manual tool by hooking the groove and the convex portion with each other in the longitudinal direction of the manual tool. With such a configuration, in a state where the groove and the convex portion are fitted, it is possible to prevent the head or the handle from coming off in the longitudinal direction of the manual tool.

[0013] Specific examples of the longitudinal fixing mechanism include those having a first fixing surface formed in the groove and facing the distal end side in the longitudinal direction of the manual tool, and a second fixing surface formed in the convex portion and facing the proximal end side in the longitudinal direction of the manual tool. With such a configuration, in a state where the groove and the convex portion are fitted, when the handle is pulled toward the proximal end side in the longitudinal direction, the first fixing surface and the second fixing surface are engaged, so that it is possible to more reliably prevent the head or the handle from coming off in the longitudinal direction of the manual tool.

[0014] As a more detailed aspect of the longitudinal fixing mechanism, a pair of the first fixing surface and the second fixing surface are provided respectively. In a state where the groove and the convex portion are fitted, it is preferable that, when viewed from the direction of the rotation axis, the fixing mechanism has a wedge shape that expands toward the tip in the longitudinal direction of the hand tool. In this case, with a simple structure such as a wedge shape, it is possible to prevent the head or the handle from coming off in the longitudinal direction of the hand tool.

[0015] Since the head acts on the object, in order to ensure the mechanical strength of the head, it is preferable that the tensile strength of the material of the head constituting the groove is greater than the tensile strength of the material of the handle constituting the convex portion.

[0016] Specifically, it is preferable that the material of the head constituting the groove is metal, and the material of the handle constituting the convex portion is a material containing carbon fiber. In this case, the mechanical strength of the head can be ensured, and since carbon fiber is lighter than iron, the weight of the entire hand tool can be reduced. In addition, since the material of the handle is carbon fiber, it is excellent in explosion prevention and can improve the safety of the operation.

[0017] It is preferable that the lamination direction of the carbon fiber constituting the convex portion is the direction along the rotation axis. In this case, when the handle is rotated around the rotation axis to operate the head, the strength of the handle increases, so that it is possible to further prevent the handle from being damaged.

[0018] [[ID=2,4]] With such a configuration, in a state where the groove and the convex portion are fitted, the opening of the groove formed on the side surface of the joining member is closed by the closing member, so that it is possible to prevent the convex portion from coming out of the opening.

[0019] ​ It is preferable that the plug member has a flat plate shape and is fixed to the head.

[0020] With such a configuration, since the plug member is fixed to the head, which has a greater strength than the handle, when the plug member is fixed by, for example, a screw, the screw hole is not formed in the handle. Therefore, it is possible to prevent breakage of the handle, such as breakage of the handle due to the formation of a screw hole. Particularly when the handle is made of a material having a lamination direction such as carbon fiber, depending on the lamination direction, the handle is likely to break through the screw hole. However, since the screw hole is formed in the head, it is possible to prevent breakage of the handle due to the formation of the screw hole.

[0021] A joining method of a manual tool having a long shape, including a head provided on the tip side and acting on an object, and a handle provided on the base end side and operating the head, is characterized in that a groove is formed on an end face of one end of either the head or the handle, a convex portion having a convex shape is formed on an end face of the other end of either the head or the handle, and the head and the handle are joined by fitting the convex portion into the groove. With the joining method of the manual tool configured as described above, the same operational effects as those of the above-described manual tool can be achieved.

Advantages of the Invention

[0022] According to the present invention configured as described above, in a manual tool for joining a head and a handle, breakage of the handle can be prevented.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0024] Hereinafter, an embodiment of the manual tool according to the present invention will be described with reference to the drawings. Note that, for the sake of clarity, any of the figures shown below may be schematically drawn with appropriate omissions or exaggerations. The same reference numerals are given to the same components, and the description thereof will be omitted as appropriate.

[0025] <Configuration of Manual Tool> The manual tool 100 of the present embodiment is generally elongated, and as shown in FIG. 1, for example, it is a wrench to which a force from an operator is applied in order to act on an object such as a screw or a bolt.

[0026] Specifically, as shown in FIG. 1, the manual tool 100 includes a head 10 that acts on an object, a handle 20 that operates the head 10, and a joining structure 30 that is interposed between the head 10 and the handle 20 and joins the head 10 and the handle 20. In the longitudinal direction X of the manual tool 100, the head 10, the joining structure 30, and the handle 20 are provided in this order from the tip side to the base end side. Hereinafter, each part will be described.

[0027] The head 10 is provided on the tip side in the longitudinal direction X and is engaged with an object directly or via another member such as a socket. Specifically, the head 10 has a ratchet mechanism 11 and a joining member 12 that joins with the handle 20.

[0028] The ratchet mechanism 11 includes a ratchet gear 111 and a claw portion 112 that regulates the rotation direction of the ratchet gear 111 in one direction, and is configured to rotate freely when rotated in the reverse direction. Note that the rotation direction of the ratchet gear 111 may be switchable between the forward direction and the reverse direction, but is not necessarily limited thereto. Note that the material constituting the ratchet mechanism 11 is a metal such as iron, for example, but the material constituting the claw portion 112 is not necessarily limited to a metal.

[0029] The joint member 12 is provided at the end on the proximal end side of the head 10. Specifically, it is provided on the proximal end side of the head 10 with respect to the ratchet mechanism 11 in the longitudinal direction X and has a substantially rectangular parallelepiped shape. The joint member 12 is made of a material having a higher strength than the handle 20. The material constituting the joint member 12 is a metal such as iron, for example.

[0030] The handle 20 operates the head 10 by being rotated around the rotation axis C of the handle 20, which is a direction orthogonal to the longitudinal direction X. Specifically, the handle 20 has an elongated shape with flat upper and lower surfaces in the direction of the rotation axis C. Here, the thickness of the handle 20 in the direction of the rotation axis C is substantially the same as the thickness of the joint member 12 in the direction of the rotation axis C, but is not limited thereto.

[0031] In the present embodiment, the handle 20 is made of a material that is lighter and has a lower tensile strength than the head 10, and is made of a material containing carbon fiber, such as CFRP, which is a composite material of carbon fiber and resin, or a composite material synthesized by a papermaking method of carbon fiber and thermoplastic resin. Further, the lamination direction of the carbon fiber constituting the handle 20 is a direction along the rotation axis C.

[0032] As shown in FIGS. 2 to 4, the joining structure 30 includes a groove 31 formed in the head 10, a convex portion 32 formed in the handle 20 with a convex shape, a longitudinal fixing mechanism 33 for fixing the groove 31 and the convex portion 32 in the longitudinal direction X, and a plug member 34 for fixing the groove 31 and the convex portion 32 in the direction of the rotation axis C. And the joining structure 30 joins the head 10 and the handle 20 by at least fitting the convex portion 32 into the groove 31.

[0033] As shown in FIGS. 2 and 3(a), the groove 31 is formed on the end face 12a on the proximal end side of the joining member 12 and extends along the rotation axis C. Specifically, the groove 31 extends through from one side surface to the other side surface of the joining member 12. In the present embodiment, the groove 31 opens on both side surfaces of the joining member 12. Here, the material constituting the groove 31 is a metal such as iron, which is the same as the material constituting the joining member 12 in the present embodiment.

[0034] As shown in FIGS. 2 and 3, the convex portion 32 is formed on the end face 20a of the end portion on the distal end side of the handle 20. In the present embodiment, the convex portion 32 is made of a material having a tensile strength smaller than that of the groove 31, and is made of a composite material containing carbon fiber, for example, the same as the handle 20. Further, the stacking direction of the carbon fiber constituting the convex portion 32 is the direction along the rotation axis C.

[0035] The longitudinal fixing mechanism 33 fixes the groove 31 and the convex portion 32 in the longitudinal direction X by hooking the groove 31 and the convex portion 32 on each other in the longitudinal direction X. Specifically, as shown in FIGS. 2 and 3(a), the longitudinal fixing mechanism 33 has a first fixing surface 33a formed in the groove 31 and facing the distal end side in the longitudinal direction X, and a second fixing surface 33b formed in the convex portion 32 and facing the proximal end side in the longitudinal direction X. More specifically, the first fixing surface 33a is a pair of surfaces provided to face each other and constituting the groove 31, and the second fixing surface 33b is a pair of surfaces formed on both sides of the convex portion 32 along the longitudinal direction X.

[0036] Here, in a state where the groove 31 and the convex portion 32 are fitted together, the pair of first fixing surfaces 33a and the pair of second fixing surfaces 33b are joined respectively. And, when viewed from the direction of the rotation axis C, the longitudinal fixing mechanism 33 has a wedge shape that expands toward the tip in the longitudinal direction X.

[0037] The closing member 34 closes the opening of the groove 31 formed on the side surface of the joining member 12 in a state where the groove 31 and the convex portion 32 are fitted. Specifically, as shown in FIG. 4, the closing member 34 is a pair of flat plate-shaped members. One closing member 34 closes the opening of the groove 31 formed on one side surface of the joining member 12, and the other closing member 34 closes the opening of the groove 31 formed on the other side surface of the joining member 12. In the present embodiment, the closing member 34 closes the openings of the grooves 31 formed on both side surfaces of the joining member 12 and both side surfaces of the convex portion 32 in a state where the groove 31 and the convex portion 3 are fitted.

[0038] Also, the closing member 34 is fixed to the head 10. In the present embodiment, the closing member 34 is fixed to the joining member 12 by, for example, a screw. For this reason, a screw hole h is formed in the joining member 12.

[0039] <Joining method of the manual tool> Next, the joining method of the manual tool 100 in the present embodiment will be described.

[0040] The end surface 12a of the joining member 12 is processed to form a groove 31 in the end surface 12a extending from one side surface of the joining member 12 to the other side surface. Here, the end surface 12a is processed so that the groove 31 has a wedge shape.

[0041] The end of the handle 20 is processed to form a convex portion 32. Here, the end of the handle 20 is processed so that the convex portion 32 has a wedge shape substantially equivalent to the groove 31.

[0042] Next, as shown in FIG. 3(a), with the ratchet mechanism 11 and the joint member 12 provided in this order from the tip side to the base end side, the convex portion 32 is fitted into the groove 31. As a result, as shown in FIG. 3(b), the handle 20 and the head 10 are fixed with respect to the longitudinal direction X.

[0043] With the groove 31 and the convex portion 32 fitted, the closing member 34 is fixed to the head 10. Here, the closing member 34 is fixed to the head 10 by passing a screw through the screw hole h formed in the joint member 12. As a result, as shown in FIG. 4, the joint member 12 and the handle 20 are fixed with respect to the direction of the rotation axis C.

[0044] <Advantages of the present embodiment> According to the manually operated tool 100 configured as described above, since the convex portion 32 fits into the groove 31, the head 10 and the handle 20 are joined, so that the head 10 and the handle 20 can be replaced. And, for example, compared with the case where the head 10 and the handle 20 are joined by a split pin, according to the manually operated tool 100 of the present embodiment, there is no need to process the handle 20 such as drilling a hole for the split pin. As a result, it is possible to prevent breakage of the handle 20 such as cracking of the handle 20 due to the hole for the split pin.

[0045] Further, according to the manually operated tool 100 of the present embodiment, since the groove 31 is formed in the joint member 12 made of a material having a higher strength than the handle 20, compared with the case where the groove 31 is formed in the handle 20, it is possible to prevent the joint portion from being damaged when the head 10 is operated. As a result, compared with the case where the groove 31 is formed in the handle 20, it is not necessary to increase the thickness of the handle 20, so that the entire manually operated tool 100 can be lightened and it becomes easier for the operator to hold the handle 20.

[0046] Furthermore, since the longitudinal fixing mechanism 33 fixes the groove 31 and the convex portion 32 with respect to the longitudinal direction X, it is possible to prevent the head 10 or the handle 20 from coming off in the longitudinal direction X in a state where the groove 31 and the convex portion 32 are fitted.

[0047] Specifically, when the groove 31 and the convex portion 32 are engaged, if an attempt is made to move the handle 20 toward the proximal end side in the longitudinal direction X, the first fixing surface 33a and the second fixing surface 33b will catch, so that it is possible to more reliably prevent the handle 20 from coming out in the longitudinal direction X.

[0048] More specifically, in a state where the groove 31 and the convex portion 32 are engaged, when viewed from the direction of the rotation axis C, the longitudinal fixing mechanism 33 has a wedge shape that expands toward the tip of the hand tool 100 in the longitudinal direction X. Thus, with a simple structure such as a wedge shape, it is possible to prevent the handle 20 from coming out along the longitudinal direction X from the head 10.

[0049] In addition, since the joining member 12 is made of metal and the handle 20 is made of carbon fiber, the strength of the material of the joining member 12 that forms the groove 31 is greater than the strength of the material of the handle 20 that forms the convex portion 32. Thereby, the mechanical strength of the head 10 can be ensured, and the weight of the entire hand tool 100 can be reduced. Further, since the material of the handle 20 gripped by the operator is a material containing carbon fiber, it is excellent in explosion prevention and can improve the safety of the operation. In particular, when the material of the handle 20 is CFRP, it is lighter, less likely to corrode, and less likely to bend compared to iron.

[0050] Moreover, since the lamination direction of the carbon fiber that forms the convex portion 32 is the direction along the rotation axis C, the strength of the handle 20 when rotating the handle 20 around the rotation axis C to operate the head 10 increases, and it is possible to further prevent the handle 20 from being damaged.

[0051] Furthermore, in a state where the groove 31 and the convex portion 32 are engaged, the closing member 34 closes the opening of the groove 31 formed on the side surface of the joining member 12, so that it is possible to prevent the convex portion 32 from coming out through the opening.

[0052] In addition, since the plug member 34 is fixed to the joint member 12 having a greater strength than the handle 20 via a screw, the screw hole h is formed in the joint member 12. Therefore, by forming the screw hole h in the handle 20, breakage of the handle 20 such as cracking of the handle 20 can be prevented. Particularly in the present embodiment, since the handle 20 is made of a material having a lamination direction such as carbon fiber, depending on the lamination direction, if the screw hole h is formed in the handle 20, the handle 20 is likely to crack. On the other hand, in the manual tool 100 of the present embodiment, since the screw hole h is formed in the head 10, cracking of the handle 20 due to the formation of the screw hole h can be prevented.

[0053] <Other Embodiments> Note that the present invention is not limited to the above-described embodiment.

[0054] In the above embodiment, the groove 31 is formed in the joint member 12 which is the end of the head 10, and the convex portion 32 is formed at the end of the handle 20, but the present invention is not limited to this. Specifically, as shown in FIG. 5, the groove 31 may be formed in the end face 20a of the end of the handle 20, and the convex portion 32 may be formed in the end face of the joint member 12. More specifically, the groove 31 may be formed in the end face 20a on the tip side of the handle 20, and the convex portion 32 may be formed on the base end side of the joint member 12.

[0055] In this case, as shown in FIG. 5(a), the first fixing surface 33a is formed on the convex portion 32 formed on the base end side of the joint member 12, and the second fixing surface 33b is formed on the end face 20a on the tip side of the handle 20. Then, as shown in FIG. 5(b), in a state where the groove 31 and the convex portion 32 are fitted together, when viewed from the direction of the rotation axis C, the longitudinal fixing mechanism 33 has a wedge shape that expands toward the base end side in the longitudinal direction X.

[0056] Although the manual tool 100 of the above-described embodiment was a wrench, it is not limited thereto as long as it is a manual tool that operates the head 10 by rotating the handle 20 around the rotation axis C. For example, the manual tool 100 may be a wrench such as a ratchet wrench, a spectacle wrench, a ratchet spectacle wrench, a spanner, a combination wrench, a handle wrench, an adjustable wrench, or a torque wrench, or may be a plier, a vice, or a locking plier.

[0057] In the above-described embodiment, the rotation axis C was in a direction orthogonal to the longitudinal direction X, but the rotation axis C may be in a direction intersecting the longitudinal direction X.

[0058] In the above-described embodiment, the groove 31 opened on both side surfaces of the joining member 12, but it does not have to open on both side surfaces of the joining member 12, and it may open on either one of the side surfaces of the end portion on the proximal end side of the head 10 or the end portion on the distal end side of the handle 20.

[0059] In the above-described embodiment, the longitudinal fixing mechanism 33 was wedge-shaped when viewed from the direction of the rotation axis C, but it is not limited thereto. In order to hook the groove 31 and the convex portion 32 with each other, the longitudinal fixing mechanism 33 may have, for example, a T-shape or other shape when viewed from the direction of the rotation axis C.

[0060] In the above-described embodiment, the entire joining member 12 was made of metal, but in order to prevent breakage of the joining portion, at least the end surface 12a on which the groove 31 is formed is made of a material having a greater tensile strength than the material constituting the convex portion 32, such as metal, for example, and the other portions do not have to be made of a material having a greater tensile strength than the material constituting the convex portion 32, such as metal.

[0061] In the above-described embodiment, the material constituting the groove 31 was metal and the material constituting the convex portion 32 was carbon fiber, but it is not limited thereto. Specifically, the material constituting the groove 31 and the material constituting the convex portion 32 may be selected so that the strength of the groove 31 is greater than the strength of the convex portion 32.

[0062] In the above embodiment, the stacking direction of the carbon fibers constituting the convex portion 32 was the direction along the rotation axis C, but it does not have to be the direction along the rotation axis C.

[0063] In the above embodiment, the closing member 34 was a pair of members, but the closing member 34 only needs to close at least one of the openings of the groove 31 formed on one side surface of either the end portion on the proximal end side of the head 10 or the end portion on the distal end side of the handle 20.

[0064] In the above embodiment, the hand tool 100 was configured to include the closing member 34, but in order to prevent the handle 20 from coming off the head 10 along the longitudinal direction X of the hand tool 100, the hand tool 100 does not have to include the closing member 34.

[0065] Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit thereof. For example, it will be understood by those skilled in the art that the plurality of exemplary embodiments described above are specific examples of the following aspects.

[0066] (Aspect 1) A hand tool having a long shape, provided on the distal end side with a head that acts on an object, provided on the proximal end side with a handle for operating the head, and having a joining structure interposed between the proximal end side of the head and the distal end side of the handle for joining the head and the handle. The joining structure has a groove formed on the end face of one end of either the head or the handle, and a convex portion formed in a convex shape on the end face of the other end of either the head or the handle. When the convex portion fits into the groove, the head and the handle are joined.

[0067] (Aspect 2) The manual tool operates the head by rotating the handle around a rotation axis that is a direction intersecting the longitudinal direction of the manual tool. The groove is formed on an end surface on the proximal end side of the head, extends along the rotation axis, the convex portion is formed on the distal end side of the handle, and when the convex portion fits into the groove along the rotation axis, the head and the handle are joined, the manual tool according to Aspect 1.

[0068] (Aspect 3) The joining structure further includes a longitudinal fixing mechanism that fixes the groove and the convex portion with respect to the longitudinal direction of the manual tool by hooking the groove and the convex portion with each other in the longitudinal direction of the manual tool, the manual tool according to Aspect 1 or Aspect 2.

[0069] (Aspect 4) The longitudinal fixing mechanism has a first fixing surface formed in the groove and facing the distal end side in the longitudinal direction of the manual tool, and a second fixing surface formed in the convex portion and facing the proximal end side in the longitudinal direction of the manual tool, the manual tool according to Aspect 3.

[0070] (Aspect 5) A pair of the first fixing surface and the second fixing surface are respectively provided, and in a state where the groove and the convex portion are fitted, when viewed from the rotation axis direction, the longitudinal fixing mechanism has a wedge shape that expands toward the distal end in the longitudinal direction of the manual tool, the manual tool according to Aspect 4.

[0071] (Aspect 6) The tensile strength of the material of the head constituting the groove is greater than the tensile strength of the material of the handle constituting the convex portion, the manual tool according to any one of Aspects 1 to 5.

[0072] (Aspect 7) The material of the head constituting the groove is metal, and the material of the handle constituting the convex portion is a material containing carbon fiber, the manual tool according to Aspect 6.

[0073] (Aspect 8) The lamination direction of the carbon fiber constituting the convex portion is a direction along the rotation axis, the manual tool according to Aspect 7.

[0074] (Aspect 9) The groove is formed to open on a side surface of an end portion of the head or the handle, and the joining structure further includes a plugging member that closes the opening formed on the side surface in a state where the groove and the convex portion are fitted. The manual tool according to any one of Aspects 1 to 8.

[0075] (Aspect 10) The plugging member has a flat plate shape and is fixed to the head. The manual tool according to Aspect 9 that cites Aspect 6.

[0076] (Aspect 11) A method for joining a manual tool that includes a head provided on the tip side and acting on an object, and a handle provided on the base end side and operating the head, and has a long shape. A groove is formed on an end surface of one end portion of the head or the handle, and a convex portion having a convex shape is formed on an end surface of the other end portion of the head or the handle. The head and the handle are joined by fitting the convex portion into the groove. A method for joining a manual tool.

Description of Reference Numerals

[0077] 100 ··· Manual tool 10 ··· Head 20 ··· Handle 30 ··· Joining structure 31 ··· Groove 32 ··· Convex portion 33 ··· Longitudinal fixing mechanism 33a ··· First fixing surface 33b ··· Second fixing surface 34 ··· Plugging member C ··· Rotation axis X ··· Longitudinal direction of the manual tool

Claims

1. A manual tool having a long and narrow shape, a head provided on the tip side and acting on an object, and a handle provided on the base end side for operating the head, comprising a joining structure interposed between the base end side of the head and the tip side of the handle for joining the head and the handle, wherein the joining structure has a groove formed on an end face of one end of either the head or the handle, and a convex portion formed in a convex shape on an end face of the other end of either the head or the handle, and the head and the handle are joined by fitting the convex portion into the groove. A manual tool.

2. The manual tool is configured to operate the head by rotating the handle around a rotation axis which is a direction intersecting the longitudinal direction of the manual tool, the groove is formed on the end face of the base end side of the head and extends along the rotation axis, the convex portion is formed on the tip side of the handle, and the head and the handle are joined by fitting the convex portion into the groove along the rotation axis. The manual tool according to Claim 1.

3. The joining structure further comprises a longitudinal fixing mechanism for fixing the groove and the convex portion in the longitudinal direction of the manual tool by hooking the groove and the convex portion with each other in the longitudinal direction of the manual tool. The manual tool according to Claim 1.

4. The longitudinal fixing mechanism has a first fixing surface formed in the groove and facing the tip side in the longitudinal direction of the manual tool, and a second fixing surface formed in the convex portion and facing the base end side in the longitudinal direction of the manual tool. The manual tool according to Claim 3.

5. A pair of the first fixing surface and the second fixing surface are provided respectively, and in a state where the groove and the convex portion are fitted together, when viewed from the rotation axis direction, the longitudinal fixing mechanism has a wedge shape that expands toward the tip in the longitudinal direction of the manual tool. The manual tool according to Claim 4.

6. The tensile strength of the material of the head constituting the groove is greater than the tensile strength of the material of the handle constituting the convex portion. The manual tool according to Claim 1.

7. The material of the head constituting the groove is metal, and the material of the handle constituting the convex portion is a material containing carbon fiber. The manual tool according to Claim 6.

8. The lamination direction of the carbon fiber constituting the convex portion is the direction along the rotation axis. The manual tool according to Claim 7.

9. The groove is formed to open on a side surface of an end portion of the head or the handle. The manual tool according to any one of claims 1 to 8, wherein the joining structure further includes a closing member that closes the opening formed on the side surface in a state where the groove and the convex portion are fitted.

10. The manual tool according to claim 9, which cites claim 6, wherein the closing member is flat and is fixed to the head.

11. A method for joining a manual tool having a long shape, comprising a head provided on a tip side and acting on an object, and a handle provided on a base end side and operating the head. Form a groove on an end face of one end of the head or the handle. Form a convex portion having a convex shape on an end face of the other end of the head or the handle. A method for joining a manual tool, wherein the head and the handle are joined by fitting the convex portion into the groove.

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