JP3076194B2 - Tool and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool used for cutting an object through a user's hand and a method for manufacturing the same, and more particularly, to a tool having a metal handle fixed to a metal handle. And a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various tools, such as knives, knives, and knives, have been put to practical use as a tool comprising a metal handle portion and a metal blade.

[0003] These tools are generally composed of a metal handle portion and a metal blade, which are separate components, and these components are joined together to obtain an integrated tool. .

[0004] In manufacturing a tool having such a structure, for example, a core having a blade between one handle piece and another handle piece, which are half-split, forming a handle portion. A manufacturing method has been put to practical use in which when the handle pieces are welded to each other, the blade periphery and the handle portion are joined by simultaneously joining the core periphery.

[0005] Alternatively, a blade having a core which is large enough to be inscribed in the handle is manufactured, and while the core is gripped by an opening formed at one end of the handle, the periphery of the handle is welded. A manufacturing method of joining the blade and the handle by spot welding at the upper end, the lower end, or the upper and lower ends of the opening of the handle has been put to practical use.

[0006]

In the case of the former, since the core constituting the blade is interposed between the handle pieces, the blade is not twisted or twisted during the cutting operation, so that the blade is good. It has the advantage that a cutting sensation can be obtained.

However, when manufacturing a tool having such a structure, the blade (core) is held at an appropriate position between the handle pieces by using a fixing jig or the like, and the periphery of the handle portion and the core are held. The perimeter had to be welded.
As described above, it is complicated to perform welding while maintaining the proper positions of the three members, and there is a limit in improving the manufacturing efficiency.

[0008] In the latter case, since the blade and the handle are joined only by spot welding at the opening at one end of the handle, the blade may be twisted or twisted during the cutting operation. The cutting sensation worsens.

Further, in the case of manufacturing a tool having such a structure, it is necessary to hold the blade (core) at an appropriate position between the handle pieces using a fixing jig or the like.
Since it is only held at the opening, more appropriate positioning is required, and there is a problem that the manufacturing process becomes complicated.

In such a case, instead of spot welding at the opening of the handle, it seems that welding should be performed to weld the entire opening. However, since the opening of the handle has a large opening area, if the entire opening is welded, the air inside the handle, which is sealed except for the opening, is warmed and expanded, and the outside of the welded opening is Therefore, there is a problem in that the opening and the joining surface of the blade do not adhere to each other and welding is not effectively performed, resulting in insufficient strength and poor appearance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a tool which has a structure in which the blade is easily positioned with respect to the handle, and which has a high joint strength between the handle and the blade. It is intended to be. It is another object of the present invention to provide a method of manufacturing a tool which can improve the manufacturing efficiency of the tool and can surely join the handle and the blade.

[0012]

In order to achieve the above-mentioned object, a tool according to the present invention comprises a blade having a blade formed on one side edge and a core extending from the blade. And a handle portion having an opening for inserting the core, wherein the handle portion and the blade are joined together with the core included therein.
A hole having a desired shape is formed at a desired position in the
The child is extended to a hole formed in the handle portion, and further
In addition, at the end of the core, an engaging portion to be engaged with the hole is provided.
Formed, the core is inserted into the opening, and the engaging portion is inserted into the hole.
In the engaged state, the opening of the handle portion and the core
Being welded and engaged in the hole and the hole
The core is welded to the engaging portion formed at the end.
Provided with a configuration that.

[0013]

Further, the method of manufacturing a pottery according to the present invention includes a first step of forming a hole at a desired position of a previously manufactured handle portion via a cutting means, and an engaging portion corresponding to the hole at an end. A second step of manufacturing a blade comprising the formed core and a blade having a blade formed on one side edge, a hole formed in the handle in the first step, and a core end in the second step A third step of inserting the blade into the handle so that the engaging portion formed on the handle engages, a fourth step of engaging the blade inserted into the handle in the third step with the handle , Destination
First, melt the handle and blade at the opening of the handle.
The fifth step of contacting, and then the hole formed in the handle part and the middle
And a sixth step of welding the engagement portion formed at the end of the child.
are doing.

[0015]

[0016]

In the tool according to the present invention having the above-described structure, the object is cut by the blade formed on the blade portion constituting the blade, and the handle portion holds the blade through the core constituting the blade. The core is inserted through an opening formed in the handle, and the handle and the blade are welded together with the core included in the handle. At this time, the air expanded inside the handle portion during welding is discharged from a hole formed in a desired shape at a desired position of the handle portion.

When the core is extended to a hole formed in the handle portion and an engaging portion corresponding to the shape of the hole is formed at the end portion, the core is inserted into the handle portion. At this time, the hole of the handle portion engages with the engagement portion of the core end. Therefore, the position of the blade with respect to the handle portion is accurately maintained.

Since the engaging portion of the core end is welded to the hole of the handle, the core does not move inside the handle. Further, when the hole is formed at the rear end of the handle portion, the core is also stretched correspondingly, so that a good weight balance desired when using the tool is realized.

Next, in the method for manufacturing a pottery according to the present invention,
In the first step, the handle portion is manufactured in advance, and a hole is formed at a desired position of the manufactured handle portion via cutting means. On the other hand, in the second step, a core in which an engaging portion corresponding to a hole formed in a desired position of the handle portion in the first step is formed at an end portion, and a blade having a blade formed at one side edge portion We manufacture blades composed of parts.

Subsequently, in a third step, the blade obtained in the second step is inserted into the handle part obtained in the first step. At this time, a hole formed in the handle part and a core end part are inserted. The blade is inserted into the handle so that the engaging portion formed on the handle is engaged. The engagement of the handle and the blade in this manner facilitates positioning of the blade with respect to the handle. And in the fourth step,
Welding of the handle and the blade is performed.

[0021]

[0022] In the fifth step, welded to the handle portion and the blade in the opening of the handle portion, and an engagement portion formed in the hole and the core end portion formed in the handle portion in a subsequent sixth step Weld . In this way, by welding the handle opening first in the fifth step, the inflated air inside the handle is discharged from the hole formed in the handle.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments of the present invention applied to a knife will be described below with reference to the drawings.

First, a first embodiment will be described with reference to FIGS. 1, 2, and 3. The knife 1 includes a blade 2 and a handle 3. The blade 2 includes a blade 21 having a blade formed at one side edge, and a core 22 extending from the blade 21 to the rear end of the handle 3.

The handle portion 3 has an opening 32 formed at the front end for inserting the core 22, and a hole 31 formed at the rear end. The formation position of the hole 31 is provided slightly above the center in the vertical direction as shown in FIG. FIG. 2 shows a state before the hole 31 is closed by welding.

The core 22 extends to the rear end of the handle portion 3, and an engagement portion 23 matching the cross-sectional shape of the hole 31 is formed at the end. In addition, this engaging portion 2
3 has a cross-sectional area smaller than the opening area of the hole 31.
The blade 2 and the handle 3 are welded to the opening 32 and the core 22, and the engaging portion 23 inserted from the opening 32 of the handle 3 is engaged with the hole 31. After that, the engaging portion 23 and the hole 31 are joined by welding. The hole 31 is closed by welding at this time.

Next, the operation of the knife 1 having such a configuration will be described. The knife 1 according to the present embodiment is assembled by inserting a core 22 constituting a part of the blade 2 from an opening 32, and the handle 3 is connected to the opening 3.
In 2, the blade 2 is held by gripping the core 22. At this time, the hole 31 at the rear end of the handle portion 3 and the core 22
By inserting the core 22 into the handle portion 3 so that the engaging portions 23 engage with each other, the positioning of the blade 2 with respect to the handle portion 3 becomes easy and reliable.

The handle portion 3 and the blade 2 are welded to the opening 32 and the core 22 at the periphery of the opening 32, and the air expanded inside the handle portion 3 due to the welding is a hole. It is discharged from 31 to the outside. For this reason, the joint surface of the opening 32 (the handle part 3) and the core 22 (the blade 2) in the joint part 4 adheres closely, and is joined reliably.

Further, the engaging portion 23 at the end of the core 22 is
Therefore, the movement of the core 22 inside the handle portion 3 can be reliably prevented, and the core 22 is extended to the rear end of the handle portion 3, so that the weight balance of the knife 1 is reduced by the balance weight. It is good even if it is not installed internally.

Next, a second embodiment will be described with reference to FIGS. Since the basic structure is the same as that of the knife according to the first embodiment, only different structures will be described. A hole 33 is formed in the bottom of the handle portion 3 according to the second embodiment, and the end of the core 22 is also extended toward the bottom and correspondingly formed at the end of the core 22. The engaging portion 23 to be formed is also formed toward the bottom. Further, in order to prevent the weight balance of the knife 1 from being biased toward the blade portion 2, a balance weight W is provided in the rear end of the handle portion 3.

In the knife 1 according to the second embodiment having such a configuration, although the balance weight W needs to be provided internally, since the core 22 can be shortened, the length of the entire blade 2 is accordingly increased. The length can be shortened, and the handling is easy in combination. In addition, core 22
Since the engaging portion 23 formed at the end engages the hole 33 formed in the handle portion 3, the blade 2 is held at an appropriate position with respect to the handle portion 3 even though the core 22 is short. Is done.

[0032]

[0033]

Next, a method of manufacturing the knife 1 according to the first embodiment will be described with reference to FIG . Handle part 3
An opening 32 is formed at the front end through a process (not shown) of welding left and right two handle pieces formed in a half-shape to each other except for the front end, and polishing the welded portion. Supplied in a cylindrical shape with a bottom. In the process shown in FIG.
The hole 31 is formed by a cutting means D1 such as a drill.
The position where the hole 31 is formed is the rear end face of the handle portion 3,
In this embodiment, it is formed from above the center. Thus, the manufacture of the handle portion 3 is completed.

On the other hand, the blade 2 has a blade formed at one side edge of the blade portion 21, a core extending from the blade portion is formed in accordance with the inner dimension of the handle portion 3, and an end of the core 22 is formed. Hole 31
Is supplied through a step (not shown) of forming the engaging portion 23 having a smaller cross-sectional area than the opening area of the hole 31 according to the shape of the hole 31.

In this embodiment, the manufacturing process is described in the order of manufacturing the handle portion 3 first and then manufacturing the blade 2 later. However, the blade 2 is manufactured first, and then the handle portion 3 is manufactured. The same applies to the order in which they are performed.

[0037] Thus the blade 2 and the handle portion 3 obtained are combined in the process shown in Figure 6 (b).
With the blade 2 and the handle 3, the core 22 of the blade 2 is inserted from the opening 32 of the handle 3, and the engaging portion 23 formed at the end of the core 22 is attached to the rear end of the handle 3. It is assembled so as to engage with the formed hole 31. At this time, by combining the hole 31 and the engaging portion 23 so as to engage with each other, the blade 2 and the handle portion 3 are arranged at appropriate positions. Therefore, there is no need for a jig or the like for fixing them in particular. , Can be easily combined.

The blade 2 and the handle 3 thus assembled are welded to each other by the steps shown in FIGS . 6 (c) and 6 (d). First, the blade 2 and the handle portion 3 are welded at the opening 32 formed in the handle portion 3. Here, the opening peripheral length of the opening 32 is long, and the blade 2
Since the handle 3 and the handle 3 are subjected to the welding process for a relatively long time, the air in the handle 3 is heated by the heat generated by welding, expands, and tries to discharge to the outside.

Here, in the case of the conventionally used handle portion, since there is no portion that communicates with the outside except for the opening portion,
Although the inflated air is discharged from the opening, the handle portion 3 according to the present embodiment has a hole 31 formed therein, and the engaging portion 23 at the end of the core 22 engaging with the hole 31 is larger than the hole 31. Due to the small cross-sectional area, the inflated air is
Is discharged to the outside.

Therefore, unlike the conventional case, the expanded air is not discharged from the opening and the blade 2 is
The joining surface of the handle portion 3 and the joining surface of the handle portion 3 are in close contact with each other, so that the knife 1 is reliably joined and the joining strength is high.

Subsequent to the welding, welding is performed in the hole 31 in which the engaging portion 23 is engaged. At this time, since the region to be welded is small, the air inside the handle portion 3 does not expand due to welding. The portions welded by the above two steps are polished by a polishing step (not shown).

The knife manufacturing process is completed through the above-described plurality of processes, and the knife is shipped to the market after inspection and the like. As described in detail based on the above several embodiments, in the knife 1 according to the present embodiment, since the hole 31 is formed at a desired position of the handle portion 3, the knife 2 and the handle portion 3 are welded. The air inside the handle portion 3 which is heated and expanded in accordance with
Is discharged from Accordingly, although it has been known that high joining strength can be easily obtained, the opening 32 formed in the handle portion 3 cannot be implemented because the expanded air is discharged from the opening 32. Blocking welding can be performed, and a knife having high joining strength can be easily obtained.

Further, in the knife 1 according to the first and second embodiments in which the engaging portion 23 for engaging with the holes 31 and 33 is formed at the end of the core 22, the engaging portion 23 has the hole 31. , 33 , the core 22 is securely fixed inside the handle portion 3, so that the blade 2 and the handle portion 3 are combined in an extremely easy and secure combination position. be able to. Further, when cutting the object, the core 22 does not move inside the handle during the cutting operation, and the blade portion 21 does not slightly move, so that a good cutting feeling can be given.

Further, in the knife 1 according to the first embodiment, the core 22 is extended to the length of the rear end of the handle portion 3 so that a knife having a weight balance which is easy to handle in a cutting operation without a balance weight is provided. can do.

In the method of manufacturing the knife 1 according to the present embodiment, when welding the blade 2 and the handle portion 3, first, welding is performed to close the opening 32 at the opening 32,
Thereafter, a step of welding the hole 31 with which the engaging portion 23 is engaged is constituted.

Therefore, the welding area is large and the handle 3
Even when the opening 32 for expanding the air inside is welded, the expanded air inside the handle portion 3 is not removed from the hole 31.
, And can be joined in a state where the joining surface of the handle portion 3 and the blade 2 in the joining portion 4 is in close contact with each other. Therefore, a knife having a high joining strength between the blade 2 and the handle portion 3 can be efficiently manufactured.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiments, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, it is easily inferred.
In the present embodiment, the knife according to the present invention is embodied in a knife, but the knife may be any metal tool including a metal handle portion and a metal blade portion and requiring welding. Useful tools include knives, kitchen knives, sand and ono. Also,
The hole 31 formed in the handle portion 3 is formed at an appropriate position corresponding to the shape of the core 22 and the like, and is not limited to the forming position shown in the embodiment.

[0048]

As described above, the tool of the present invention comprises a handle having a hole and a blade having a core end having an engaging portion. Can be easily positioned, and the joining strength between the handle portion and the blade can be increased.

[0049] The manufacturing method of conveniences of the present invention performs a welding in first opening when welding the handle portion and the blade, then the production of Toshikata since the step of performing a welding hole and the engaging portion The efficiency can be improved and the handle portion and the blade can be securely joined.

[Brief description of the drawings]

FIG. 1 shows a part of a knife according to a first embodiment taken along line A- in FIG.
FIG. 3 is a side view showing a cross section partially cut along line A.

FIG. 2 is a rear view of the knife according to the first embodiment.

FIG. 3 is a plan sectional view of the knife according to the first embodiment.

FIG. 4 shows a part of the knife according to the second embodiment taken along line B- in FIG.
It is a side view shown in the section cut | disconnected by the B line.

FIG. 5 is a bottom view of a knife according to a second embodiment.

FIG. 6 is an explanatory view showing a manufacturing process of the knife according to the first embodiment .
FIG. 6A is a diagram illustrating a process of forming a hole in a handle portion.
FIG. 6B shows a blade inserted into the handle portion.
FIG. 6 (c) is an explanatory view showing the step of
Explanatory drawing which shows the process of welding a dollar part and a blade, FIG.
(D) is an explanatory view showing a step of welding the hole and the engaging portion;
You.

[Explanation of symbols]

1 ... knife, 2 ... blade, 3 ... handle, 4 ... joint,
21 ... blade part, 22 ... core, 23 ... engagement, 31 ... hole, 32
... opening, 33 ... hole, 34 ... hole, W ... balance weight

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B26B 3/00 B23P 15/40 B26B 1/10 B25G 3/02

Claims (2)

(57) [Claims] 1. A a blade unit having blades formed at one side edge, the blade comprising a core that is stretched formed from the blade portion, wherein in
Handle with an opening for inserting the child
The handle portion and the blade include the core
In the tool which is joined by hand, a hole having a desired shape is formed at a desired position in the handle portion.
The core extends to a hole formed in the handle portion.
Further, an end of the core is provided with an engagement with the hole.
A mating portion was formed, the core was inserted into the opening, and the engaging portion was engaged with the hole.
In the state, the opening of the handle portion and the core are welded.
And the hole and the inside engaged with the hole.
A tool which is welded to the engaging portion formed at the child end . 2. In a desired position of a previously manufactured handle portion.
A first step of forming a hole through cutting means, a core having an engagement portion corresponding to the hole formed at an end thereof and one side edge
Second step of manufacturing a blade consisting of a blade portion having a blade formed on the blade
And a hole formed in the handle portion in the first step;
The engagement part formed at the core end part
A third step of inserting the blade into the handle portion, and a blade and a hand inserted into the handle portion in the third step.
A fourth step of engaging the handle portion with the handle portion.
A fifth step of welding, and then a hole formed in the handle portion and a hole formed in the core end portion
And a sixth step of welding the engaging portion.
Production method