JP2512277B2 - Hand tool handle and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle for a manual tool, and more particularly to a handle for a manual tool such as a shovel and a scoop, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Publication No. 52-39281, a handle for a manual tool such as an shovel or a scoop has a handle body and a cylindrical handle attachment portion to be attached to a base portion of the handle body. The grip has a handle and a handle, and the handle and grip are integrally formed of synthetic resin, and the handle base is press-fitted into the handle mount to join the handle. Are known.

[0003]

However, in the above-mentioned conventional manual tool handle, the handle body and the grip made of synthetic resin are individually formed, and then the handle body is attached to the handle mounting portion of the handle body. Since the base is press-fitted and joined, it is difficult to obtain sufficient bond strength only by such press-fitting, and the grip rattles against the handle body due to long-term use, or in some cases from the handle body. There was a problem of coming off. Therefore, at present, the rivet fixing and the fixing by the adhesive are performed together with the press-fitting.

Therefore, under the present circumstances, after the handle body and the grip are individually formed, the handle body and the grip need to be joined together by press fitting, and at the same time, rivet fixing and fixing operation with an adhesive are required. There is a problem that the post-processing for the later combining is very troublesome. Furthermore, when the handle body is press-fitted and joined to the synthetic resin grip, residual stress acts on the press-fitted part,
When performing scooping work, there is a problem that the handle mounting portion of the grip is apt to be cracked or broken.

According to the present invention, the grip can be integrally bonded to the base of the handle main body at the time of molding the grip to simplify the connection, and the connection can be surely and firmly performed. (EN) Provided is a handle for a manual tool in which residual stress does not act on the handle mounting portion of the grip, so that cracks and cracks due to residual stress do not occur, and a manufacturing method thereof. Is intended.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 has a handle body 1, a tubular handle attachment portion 21 and a grip portion 22 which are attached to a base portion 11 of the handle body 1. In a handle for a manual tool having a handle 2 having a handle mounting portion 21 and a grip portion 22 integrally formed of synthetic resin, a through hole 12 or a recessed portion 13 is provided in a base portion 11 of the handle body 1. When molding the grip 2 with a synthetic resin, the base portion 11 of the handle body 1 is embedded and the handle mounting portion 21 of the grip 2 is integrally connected to the base portion 11 of the handle body 1, and the handle mounting portion 21 is connected to the handle mounting portion 21. The retaining / rotating protrusion 2 that intervenes in the through hole 12 or the recessed portion 13 of the base portion 11.
3 was integrally formed.

According to the second aspect of the present invention, the handle body 1 is formed of a tubular body, and the base portion 11 is provided with the closing body 3 for closing the open end of the base portion 11. The closing body 3 is provided with the base portion. 11 is provided with a recessed portion 31 or a through hole 32 corresponding to the through hole 12, and the base portion through hole 12 and the closed body recessed portion 31 are provided.
Alternatively, the handle attachment portion 21 of the grip 2 is provided in the closing body through hole 32.
That is, the withdrawal / rotation stop projection 23 is formed integrally.

According to the third aspect of the present invention, the handle main body 1 is made of a tubular body, the tubular handle attaching portion 21 and the grip portion 22 are attached to the base portion 11 of the handle body 1, and the handle attaching portion 21 is provided. A method for manufacturing a handle for a manual tool, comprising a grip 2 integrally formed with a grip 22 and a grip 22, wherein a base 11 of the handle main body 1 is provided with a through hole 12, and the handle main body 1 has a through hole 12. After inserting the mandrel 4 having the closing portion 41 for closing the inner opening of the through hole 12 into the inner peripheral portion, the handle body 1
The base 11 of the grip 2 is inserted into the molding portion of the handle mounting portion 21 in the mold of the grip 2, and then the synthetic resin molding material is injected into the molding die to mold the grip 2, and the molding material is penetrated. By interposing in the hole 12, a retaining / rotating projection 23 is formed on the handle mounting portion 21, and the handle body 1 is integrally connected to the handle mounting portion 21 of the grip 2 by means of an embedded molding. After that, the mandrel 4 was pulled out and manufactured.

[0009]

According to the first aspect of the present invention, when the grip 2 is molded with synthetic resin, the base portion 11 of the handle body 1 is embedded and molded, and the handle mounting portion 21 of the grip 2 is integrated with the base portion 11 of the handle body 1. The handle attachment portion 21 of the handle body 1 and the grip 2 is integrally formed with the handle attachment portion 21 so as to be integrally formed in the handle attachment portion 21 so as to intervene in the through hole 12 or the recessed portion 13 of the base portion 11. While simplifying the connection with, it is possible to secure the strength of the connection, and it is possible to reliably prevent the grip 2 from pulling out and rotating with respect to the handle body 1 due to long-term use, and improve its durability. it can.

According to the second aspect of the present invention, when the grip 2 is molded with a synthetic resin, the base portion 11 of the handle body 1 is embedded and molded, and the handle mounting portion 21 of the grip 2 is integrated with the base portion 11 of the handle body 1. To the base portion 11 of the handle body 1 by the closing body 3 while being able to firmly connect the
Since the opening end of the base 11 can be reinforced and the opening of the base 11 can be closed by the closing body 3 at the time of the embedded molding, it is possible to prevent unnecessary molding material from entering the handle body 1, resulting in material loss. It is possible to prevent an increase in weight while eliminating the above, and at the same time, to prevent sink marks at the time of the embedding molding.

Further, in the invention of claim 3, when the grip 2 is formed by using the mandrel 4, the handle body 1 is embedded and molded to be combined into one body. Therefore, the handle body 1 and the handle 2 are handled. The connection with the mounting portion 21 can be simplified and the connection can be performed firmly, while the mandrel 4 is formed at the time of molding.
Since the open end of the base 11 is closed by the closing portion 41 of the mandrel 4 inserted into the inner peripheral portion of the base metal 4, it is unnecessary in the handle main body 1 without using the closing body. It is possible to prevent the molding material from entering and also to prevent sink marks during molding.

[0012]

FIG. 6 shows a shovel to which a handle for a manual tool of the present invention is applied, in which a scooping body A is attached to the tip of a handle body 1 and a grip 2 is attached to a base 11. And
6 and 1, the handle body is composed of a tubular body made of metal, synthetic resin, or reinforced synthetic resin reinforced with high-strength fiber such as glass fiber. As shown in FIG. 1, a pair of through-holes 12, 12 facing each other are formed in the.

The grip 2 attached to the base portion 11 of the handle body 1 has a tubular handle attaching portion 21, forked portions 24 and 24 extending from the handle attaching portion 21 in a bifurcated shape, and these forked portions 2
It is composed of a grip portion 22 provided between the tip portions of 4, 4 and is integrally molded of synthetic resin. Therefore, in the present invention, when the grip 2 is formed, the base portion 11 of the handle body 1 is formed.
And the handle mounting portion 21 of the grip 2 is integrally coupled to the base portion 11 of the handle body 1 and the handle attaching portion 21 is inserted into the through holes 12, 12 of the base portion 11 to prevent slipping and turning. The stop projections 23, 23 are integrally formed. As the synthetic resin molding material of the grip 2, a polycarbonate resin, an ABS resin, a polypropylene resin, a Duracon resin, or the like is mainly used.

As described above, when the grip 2 is molded with the synthetic resin, the base portion 11 of the handle body 1 is embedded and molded, and the handle mounting portion 21 of the grip 2 is attached to the base portion 11 of the handle body 1.
Since the grip 2 and the handle body 1 can be simplified by connecting them integrally, the handle mounting portion 21 is prevented from being pulled out from the through holes 12, 12 of the base portion 11 during the embedded molding. Since the interlocking projections 23, 23 are intervened, the coupling strength can be secured, and it is possible to reliably prevent the grip 2 from pulling out or rotating with respect to the handle body 1 due to long-term use, Its durability can be improved, and further, according to the embedded molding, as in the conventional case in which the base of the handle main body is press-fitted and joined to the handle attaching portion of the grip,
Since the residual stress does not act on the handle attaching portion 21, it is possible to prevent the handle attaching portion 21 from being easily cracked or cracked due to the residual stress during scooping work.

Next, the manufacturing method of the embodiment shown in FIG.
It will be described based on. As shown in FIG. 2, this manufacturing method uses a pair of through holes 1 formed in the base portion 11 of the handle body 1.
Mandrel composed of a closing part 41 for closing the inner openings of the Nos. 2 and 12, a fitting base part 42 fitted to the tip part of the handle body 1, and a connecting rod 43 connecting the fitting base part 42 and the closing part 41. 4, the mandrel 4 is inserted into the inner peripheral portion of the handle body 1 as shown by the solid line in FIG.
The inner openings of the through holes 12 and 12 and the opening end of the base 11 of the handle body 1 are closed. After that, the base portion 11 of the handle body 1 is inserted into the forming portion of the handle attaching portion 21 of the mold (not shown) of the grip 2, and then a synthetic resin molding material is injected into the mold to fix the grip 2. At the same time as molding, the molding material is allowed to intervene in the through holes 12 and 12 to prevent the handle mounting portion 21 from slipping off and preventing rotation.
3, 23 are molded, whereby the handle body 1 is integrally connected to the handle mounting portion 21 of the grip 2 by embedding, and after that, the mandrel 4 is pulled out from the handle body 1. .

Therefore, the closing portion 41 of the mandrel 4 closes the base opening end of the handle body 1 and the inner opening of the through hole 12, so that at the time of molding, the molding material is the base portion. Unnecessary invasion into the inside of the handle body 1 from the opening end and the inner opening of the through hole 12 can be prevented, and the inner molding surface in consideration of the bonding strength can be molded, so that unnecessary molding material is not consumed. While the bonding strength can be further improved, the material loss can be prevented, the weight increase due to unnecessary intrusion of the molding material can be prevented, and the sink mark problem at the time of molding can be eliminated. As a result, the handle body 1 is firmly coupled to the handle mounting portion 21 of the grip 2, and a handle for a manual tool that does not increase the weight or cause sink marks can be obtained by a simple method. is there.

According to the above manufacturing method, the handle body 1 is
When it is formed by a tubular body made of a reinforced synthetic resin, it is particularly effective, and it is possible to effectively perform the embedding molding while preventing the deformation of the opening end by a simple method without special filling.

[0018] Then, the scooping body A is attached to the tip end portion of the handle body 1 in the handle for a hand tool thus manufactured to manufacture a shovel.

FIG. 3 shows a base portion 1 of a handle body 1 made of a tubular body.
1 shows another embodiment in which a closing body 3 for closing the open end of the base portion 11 is fitted and molded. The closing body 3 is mainly made of the same synthetic resin molding material as the grip 2. A pair of through-holes formed of resin in a columnar shape, the closing body 3 being fitted to the base portion 11 of the handle body 1 to close the open end of the base portion 11 and opposite to the base portion 11 of the handle body 1. 12 and 12 are formed, and the closed body 3 is provided with recessed portions 31 and 31 that coincide with the through holes 12 and 12,
When the grip 2 is molded with a synthetic resin, the handle body 1
The handle 11 is embedded and molded to integrally connect the handle mounting portion 21 of the grip 2 to the handle 11 of the handle body 1, and the handle mounting portion 21 is provided with the base through holes 12, 12 and the closed body recessed portion 31, Detent / rotation stop protrusion 2 that intervenes with 31
3, 23 are integrally formed. The closing body 3 is fitted immovably so as not to move inside the handle body 1 to lower the molding pressure during the embedded molding. In this case, for example, the closing body 3 is attached to the base 1
1 by using an adhesive, or, as shown in FIG. 4, by using the closing body 3 having the collar portion 33 having the same diameter as the outer diameter of the handle body 1, at the time of the embedding molding, It is preferable to fit the closing body 3 so as not to move in the handle body 1 by the molding pressure. As the closing body 3, not only synthetic resin but also wooden one may be used. Further, instead of the closing body recessed portions 31 and 31, as shown by the one-dot chain line in FIG. A closing body through hole 32 communicating with the base through holes 12, 12 may be formed in the closing body 3.

If the closing body 3 is used as described above, the opening end of the base portion 11 of the handle body 1 can be reinforced by the closing body 3 and, at the time of the embedding molding, the closing body 3 can be used to cover the inside of the handle body 1. Unnecessary molding material can be prevented from entering, and sink marks during molding can be prevented. Moreover, the recess 3 is formed in the closing body 3.
1, 31 or through holes 32 are provided, and the recessed portions 31, 3
1 or the through hole 32 with the synthetic resin material interposed, and the protrusions 23, 31 reaching the through hole 32,
Since 23 can be formed, the coupling strength of the handle body 1 to the grip 2 can be further improved.

FIG. 5 shows another embodiment in which a solid wooden handle is used as the handle body 1. In this case, a stepped portion 14 is provided on the outer circumference of the base 11 of the handle body 1 made of wood. And a pair of recessed portions 13, 13 directed toward the center of the handle body 1 are formed, and when the grip is molded with synthetic resin, the stepped base portion 11 of the handle body 1 is embedded to form a handle. The handle mounting portion 21 of the grip 2 is integrally coupled to the stepped base portion 11 of the main body 1, and the handle mounting portion 21 is also provided.
In addition, the retaining / rotating protrusions 23, 23 that intervene in the recessed portions 13, 13 of the base portion 11 are integrally formed.
Needless to say, the step portion 14 may not be provided.

Also in this embodiment, when the grip 2 is molded with synthetic resin, the base portion 11 of the handle body 1 is embedded and molded, and the handle mounting portion 21 of the grip 2 is integrated with the base portion 11 of the handle body 1. And the grip 2 and the handle body 1 can be simplified, and at the time of the embedding molding, the handle attaching portion 21 is inserted into the recessed portions 13 and 13 of the base portion 11 to prevent it from coming out and locking. Since the parts 23, 23 are intervened, the joint strength can be secured, and it is possible to reliably prevent the grip 2 from pulling out or rotating with respect to the handle body 1 due to long-term use, and its durability is improved. Further, according to the embedded molding, like the conventional case in which the base portion of the handle body is press-fitted and coupled to the handle attaching portion of the grip,
Since the residual stress does not act on the handle attaching portion 21, it is possible to prevent the handle attaching portion 21 from being easily cracked or cracked due to the residual stress during scooping work.

The number of the through holes 12 or the recessed portions 13 provided in the handle body 1 or the number of the recessed portions 31 or the through holes 32 provided in the closing body 3 is one pair as in the embodiment, or one or two.
It may be one or more and is not particularly limited.

[0024]

According to the first aspect of the present invention, when the grip 2 is molded with the synthetic resin, the base portion 11 of the handle body 1 is embedded and molded, and the handle 11 of the grip 2 is attached to the base portion 11 of the handle body 1. Since the portion 21 is integrally connected, and the handle attachment portion 21 is integrally formed with the retaining / rotating protrusion 23 that intervenes in the through hole 12 or the recessed portion 13 of the base 11.
After the grip is molded, there is no need for post-processing for coupling the grip and the handle body as in the conventional case, and the coupling strength between the handle body 1 and the handle mounting portion 21 of the grip 2 can be simplified. The grip 2 can be reliably prevented from being pulled out or rotated with respect to the handle main body 1 due to long-term use, and its durability can be improved. Since the residual stress does not act on the handle mounting portion 21 unlike the case where the grip 2 is press-fitted into the handle body 1 to be coupled to the handle mounting portion 21, the handle mounting portion 21 is subjected to residual stress during scooping work. It is possible to prevent a crack or a crack from being easily generated in 21.

According to the invention of claim 2, the grip 2
At the time of molding with the synthetic resin, the base portion 11 of the handle body 1 is embedded and molded, and the handle mounting portion 21 of the grip 2 is integrally coupled to the base portion 11 of the handle body 1, and the coupling can be performed firmly. , The base 1 in the handle body 1 by the closing body 3
1 can reinforce the opening end, and since the opening of the base 11 can be closed by the closing body 3 at the time of the embedded molding, it is possible to prevent unnecessary molding material from entering the handle body 1, It is possible to prevent an increase in weight while eliminating loss, and at the same time, to prevent sink marks during the embedding molding.

According to the third aspect of the present invention, when the grip 2 is molded by using the mandrel 4, the handle body 1 is embedded and molded to be combined into one body. The connection with the handle mounting portion 21 can be simplified, and the connection can be performed firmly, and moreover, at the time of molding, the mandrel 4 is inserted into the inner peripheral portion of the handle body 1 to close the mandrel 4. Part 41
Then, since the open end of the base 11 is closed,
It is possible to prevent unnecessary molding material from entering the handle body 1 without using the closing body, and it is also possible to prevent sink marks during molding.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view, partly omitted, of a handle for a manual tool according to the present invention.

FIG. 2 is an explanatory view showing a molded state of a handle for a manual tool.

FIG. 3 is a partially omitted vertical sectional view of a handle for a manual tool in which a handle body is provided with a closing body.

FIG. 4 is a partially omitted vertical cross-sectional view showing another embodiment of the closing body.

FIG. 5 is a partially omitted vertical sectional view of a handle for a manual tool using a wooden handle body.

FIG. 6 is a front view of a shovel to which the handle for a manual tool of the present invention is applied.

[Explanation of symbols]

 1 Handle main body 2 Grip 3 Closing body 11 Base 12 Through hole 13 Recessed hole 21 Handle mounting part 22 Grip 23 Retaining / rotating protrusion 31 Recessed part 32 Through hole

Claims (3)

(57) [Claims] 1. A handle main body (1), a cylindrical handle attaching portion (21) to be attached to a base portion (11) of the handle body (1), and a grip portion (22), and these handle attaching portions (21). ) And grip (22) are integrally formed of synthetic resin (2)
A handle for a manual tool, comprising a through hole (12) or a recess (13) in the base (11) of the handle body (1).
When molding the grip (2) with a synthetic resin,
The base portion (11) of the handle body (1) is embedded and molded, and the handle attaching portion (21) of the grip (2) is integrally coupled to the base portion (11) of the handle body (1), and the handle attaching portion ( Two
1) A handle for a manual tool, characterized in that a retaining / rotating protrusion (23) that intervenes in the through hole (12) or the recess (13) of the base (11) is integrally formed. 2. The handle main body (1) comprises a tubular body, and the base (11) thereof is provided with a closing body (3) for closing the open end of the base (11). , The base (1
Recessed portion (31) matching the through hole (12) provided in 1)
Alternatively, a through hole (32) is provided, and the base through hole (12) and the closing body concave portion (31) or the closing body through hole (32) are provided.
The handle for a manual tool according to claim 1, wherein a retaining / rotating protrusion (23) is formed integrally with the handle mounting portion (21) of the grip (2). 3. A handle body (1) comprising a tubular body, a tubular handle attachment portion (21) to be attached to a base portion (11) of the handle body (1), and a grip portion (22). A method for manufacturing a handle for a manual tool, which comprises a grip (2) in which a mounting portion (21) and a grip portion (22) are integrally formed of synthetic resin, the method comprising a base (11) of the handle body (1). Has a through hole (12), and inserts a mandrel (4) having a closing portion (41) for closing the inner opening of the through hole (12) into the inner peripheral portion of the handle body (1). After that, the base portion (11) of the handle body (1) is inserted into the molding portion of the handle mounting portion (21) of the mold of the grip (2), and then a synthetic resin molding material is injected into the mold. The grip (2) is molded by using the molding material and the molding material is allowed to intervene in the through hole (12). 21) is formed with a retaining / rotating protrusion (23), and the handle attaching portion (2) of the grip (2) is formed.
1) A method for manufacturing a handle for a manual tool, characterized in that the handle body (1) is integrally joined to the handle body (1) by embedding, and then the mandrel (4) is pulled out.