JPH078001A - Hand tools - Google Patents

Abstract

PURPOSE:To obtain a hand-operating tool having high durability by increasing the bonding strength of the attaching part of the main body to a grip without causing rattling between the parts and increasing the strength of the grip without causing local shearing load on the grip. CONSTITUTION:A bonding member 5 made of a synthetic resin is integrally molded in the tip end of a grip 1. The bonding member 5 is provided with a fitting part 51 having a tapered outer surface to enable the area contact with a tapered inner surface of a cylindrical attaching part 21 of the tool main body 1. The fitting part 51 has an extending part 52 which extends toward the base side of the grip 1 relative to the base of the attaching part 21 when the tip end of the grip 1 is inserted into the attaching part 21.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to hand tools such as shovels and scoops.

[0002]

2. Description of the Related Art Conventionally, as a manual tool such as an shovel or a scoop, a tool body such as a blade is attached to the tip side of the handle and a grip is attached to the other end of the handle. It is known from Japanese Utility Model Publication No. 3-76050.

When mounting the tool body on the handle bar, a cylindrical mounting portion B is integrally provided on the rear side of the tool body A as shown in FIG.
While inserting the tip end side of the grip handle rod C, which has a circular pipe shape, into the
A solid plug body D that reinforces the grip handle rod C is inserted into a portion of the grip handle rod C that is inserted into the attachment portion B, so that the mount portion B and the grip handle rod C and the plug body D are inserted. The connecting pin E is used to integrally connect.

[0004]

However, in the above manual tool, when the handle bar C is fitted into the tubular mounting portion B of the tool A, the inner diameter of the tubular mounting portion B and the handle bar are set. Due to the fitting tolerance with the outer diameter of C, a gap is created between the inner surface of the fitted cylindrical mounting portion B and the outer surface of the grip handle rod C. Therefore, the mounting portion B and the grip handle rod C are separated from each other. In the case where a strong bond strength is not obtained between the tool body A and the tool body A rattles with respect to the grip handle rod C during use, and further, when the soil is dug up, the tool body A When a large load is applied to, a large shear load is locally generated at the portion of the handle bar C facing the rear end of the mounting portion B, that is, the portion F in the figure, and therefore the above-mentioned The strength of the handle bar C may be impaired and the handle bar C may be deformed with long-term use. Ri, in particular, this Nigie杆 when C is formed in the reinforced synthetic resin, when generating a shear load as described above, it is the be damaged 該握 handle rod C durability worsens occurred.

An object of the present invention is to eliminate the gap between the mounting portion of the tool body and the grip handle rod and increase the contact area so that both the mount portion and the grip handle rod do not rattle. , It is possible to strengthen the bonding strength of both, and without causing a local shearing load on the grip rod to reduce the strength, even when the grip rod is formed of a synthetic resin, It is to provide a hand tool that can ensure its durability.

[0006]

In order to achieve the above object, the present invention according to claim 1 provides a tapered cylindrical mounting portion 21.
A hand tool comprising a tool main body 2 having a handle and a tubular grip handle rod 1, the distal end portion of the grip handle rod 1 being fitted into the tubular mounting portion 21, and being connected by a connecting pin 4. A connecting member 5 made of a synthetic resin which is integrally connected to the grip handle rod 1 by embedded molding is provided at the tip of the rod 1, and the connecting member 5 has a tapered inner surface and a surface of the cylindrical mounting portion 21. A fitting portion 51 having a tapered outer surface that comes into contact with the fitting portion 51 is provided, and when the tip end portion of the grip handle rod 1 is fitted into the tubular mounting portion 21, the fitting portion 51 is provided with the fitting portion 51. An extension portion 52 extending toward the base side of the grip handle rod 1 is formed with respect to the end portion of 21.

According to the second aspect of the present invention, the closing body 7 for closing the open end of the tip portion is provided at the tip portion of the grip handle rod 1.

According to the invention of claim 3, the connecting member 5 is used.
In addition, a cover portion 55 is formed to cover the outer surface of the closing body 6 that is exposed to the grip handle rod 1.

Further, in the invention of claim 4, the coupling member 5 is provided with a shell-shaped fitting portion 53 extending toward the base side of the tubular mounting portion 21 of the tool body 2.

Further, according to the invention of claim 5, a through hole 11 is provided at a tip end portion of the grip handle rod 1, and the connecting member 5 is made of synthetic resin material when the connecting member 5 is molded. 5 which is integrated with the grip handle rod 1 by interposing on
4 is provided.

[0011]

According to the first aspect of the present invention, the connecting member 5 made of synthetic resin is integrally connected to the tip of the handle bar 1, and the cylindrical mounting portion 21 of the tool body 2 is connected to the connecting member 5. A fitting portion 51 having a tapered outer surface that comes into surface contact with the tapered inner surface is provided, and the tip end portion of the grip handle rod 1 is fitted into the tubular mounting portion 21 in the fitting portion 51. When
Since the extension portion 52 extending toward the base side of the grip handle rod 1 is formed with respect to the end portion of the tubular mount portion 21, the tip end portion of the grip handle rod 1 is fitted to the tubular mount portion 21. At the time of fitting, the tapered inner surface of the mounting portion 21 and the tapered outer surface of the fitting portion 51 can be fitted into each other by making surface contact with each other without a gap by utilizing elasticity of the coupling member 5 made of synthetic resin. As a result, the contact area between the mounting portion 21 and the coupling member 5 can be increased, and the coupling strength between the mounting portion 21 and the grip handle rod 1 can be enhanced without rattling. Moreover, when excavating the soil or the like, when a large load is applied to the tool body 2, this load is extended to the rear end portion of the attachment portion 21 toward the base side of the grip handle rod 1. The grip rod 1 can be dispersed through the extension portion 52 of the member 5 and acted on the grip rod 1, and as a result, the grip rod 1 can be acted on without causing a local shear load. The strength of No. 1 can be guaranteed for a long period of time, and even if the grip handle rod 1 is made of reinforced synthetic resin such as FRP, no local shear load is generated, so its durability is guaranteed for a long period of time. can do.

Further, in the invention of claim 2, the grip handle rod 1
Since the closing body 7 for closing the open end of the tip portion is provided at the tip end portion of the, the closing body 7 allows the inside of the grip handle rod 1 from the tip opening side to the inside when working with the tool body 2. It is possible to prevent the intrusion of the like, and it is possible to strengthen the tip portion of the grip handle rod 1.

Further, according to the invention of claim 3, since the connecting member 5 is formed with the cover portion 55 for covering the outer surface of the closing body 7 which is exposed to the grip handle rod 1, While the strength of the tip portion of the grip handle rod 1 is strengthened and the intrusion of earth and sand or the like from the tip side of the grip handle rod 1 into the inside can be prevented, the cover body 55 allows the closing body 7 to move. It is possible to prevent the grip handle rod 1 from slipping out.

Further, in the invention of claim 4, since the connecting member 5 is provided with the shell-shaped fitting portion 53 extending toward the base side of the tubular mounting portion 21 of the tool body 2, the shell-shaped fitting is provided. The attachment portion 21 of the coupling member 5 via the portion 53.
Further increasing the contact area with respect to the tool body 2
It is possible to further strengthen the bonding strength between the grip handle rod 1 and the grip handle rod 1.

Furthermore, in the invention of claim 5, a through hole 11 is provided at the tip of the handle bar 1, and the connecting member 5 is made of a synthetic resin material when the connecting member 5 is molded. 11 is provided with a retaining / rotating protrusion 54 which is integrated with the handle rod 1, so that the connecting member 5 is integrally formed on the handle rod 1 side through the protrusion 54. It can be firmly connected, and when the connecting member 5 is resin-molded on the handle bar 1, a part of the synthetic resin intervenes inward from the through hole 11 provided in the handle bar 1. By so doing, the protrusion 54 can be easily molded.

[0016]

EXAMPLE FIG. 8 shows a shovel as an example of a manual tool. The shovel comprises a grip handle rod 1 made of a metal or a synthetic resin such as fiber reinforced plastic in a tubular shape, and a tool body 2 as a tool body 2. A blade, and a tip end side of the grip handle rod 1 is inserted into a cylindrical mounting portion 21 provided on the rear side of the blade 2, and the grip handle rod 1 and the mounting portion 21 are connected via a connecting pin 3. And the grip 4 is connected to the rear end side of the handle bar 1. Further, the mounting portion 21 provided on the rear side of the blade 2 is gradually tapered in diameter from the mounting base side to the rear side, and when the grip handle rod 1 is mounted on the mounting portion 21, the grip handle rod is attached. 1
Is designed to be easily inserted from the rear side of the mounting portion 21.

In the above construction, however, as clearly shown in FIGS. 1 and 2, a connecting member 5 made of synthetic resin is integrally formed with the grip handle rod 1 at the tip end portion of the grip handle rod 1. In addition to being embedded, the coupling member 5 is provided with a fitting portion 51 having a tapered outer surface 51a that comes into surface contact with a tapered inner surface 21a formed on the mounting portion 21 of the blade 2 while the fitting portion 51 is provided. When the tip end portion of the grip handle rod 1 is inserted into the attachment portion 21, the extension portion 5 extends rearward from the rear end portion of the attachment portion 21 toward the base side of the grip handle rod 1.
Form 2. Further, as the material of the connecting member 5,
For example, polycarbonate resin, ABS resin, polypropylene resin, Duracon resin, etc. are used.

When the grip handle rod 1 is attached to the blade 2, the connecting member 5 integrally formed on the tip end side of the handle handle rod 1 is inserted into the mounting portion 21 provided on the blade 2. . At this time, a fitting portion 51 is formed on the coupling member 5, and an outer peripheral surface of the fitting portion 51 is provided with a tapered outer surface 51a that comes into surface contact with a tapered inner surface 21a formed on the mounting portion 21. Therefore, the insertion can be easily performed, and at the time of the insertion, the tapered outer surface of the fitting portion 51 of the coupling member 5 is used as the tapered inner surface of the mounting portion 21 to utilize the elasticity of the coupling member 5. It is possible to make surface contact without any gap. As a result, the contact area between the mounting portion 21 and the coupling member 5 is increased, and the coupling strength between the coupling member 5, that is, the grip handle rod 1 and the mounting portion 21 is prevented from rattling. It can be strengthened to improve durability. Moreover, even when a large load is applied to the blade 2 in the case of excavating soil with the shovel, this load is applied to the rear end of the attachment portion 21 of the grip handle rod 1. It can be dispersed through the extension portion 52 portion of the coupling member 5 extending to the base side and act on the grip handle rod 1, and as a result, a local shear load is generated on the grip handle rod 1. The strength of the grip handle rod 1 can be ensured for a long period of time without using the grip handle rod 1.
Even when is formed of a reinforced synthetic resin, a local shear load is not generated, so that its durability can be guaranteed for a long period of time.

Further, as shown in FIGS. 1, 2 and 5, the coupling member 5 extends from the fitting portion 51 to the mounting base portion side of the mounting portion 21 provided on the blade 2 and the mounting portion Shell-shaped fitting portion 53 that is in surface contact with a part of the inner surface of the base portion of the portion 21
Are integrally formed. When the coupling member 5 is inserted into the mounting portion 21 of the blade 2, the tapered inner and outer surfaces 21a and 51a provided on the mounting portion 21 and the fitting portion 51 of the coupling member 5 are brought into surface contact with each other. In addition to the above, a part of the outer peripheral surface of the shell-shaped fitting part 53 is brought into surface contact with a part of the base side inner peripheral surface of the mounting part 21. In this case, the contact area of the connecting member 5 with respect to the mounting portion 21 can be further increased, and the connecting strength between the blade 2 and the grip rod 1 can be further strengthened via the connecting member 5.

Further, as shown in FIGS. 1, 2, and 5, a plurality of through holes 11 are formed at the tip of the handle bar 1, and the connecting member 5 is provided on the connecting member 5 side. At the time of molding, the synthetic resin intervenes in each of the through holes 11 to provide a plurality of retaining / rotating protrusions 54 for integrating the handle bar 1 and the connecting member 5. In this case, the connecting member 5 can be firmly and integrally connected to the grip handle rod 1 side through the protrusions 54, and as described later, the connection can be made to the grip handle rod 1. When the member 5 is resin-molded, each of the protrusions 54 can be easily molded by interposing a part of the synthetic resin inwardly through the through hole 11 provided in the grip handle rod 1.

When the connecting member 5 is embedded in the tip end side of the grip handle rod 1, as shown in FIG. 3, the through holes 11 of the grip handle rod 1 are closed. A shell-shaped forming part that is inserted into the front end of the grip handle rod 1 so as to project to the front side, and forms the fitting part 51, the extension part 52, and the shell-type fitting part 53 of the connecting member 5 on the front side. 61, a closing portion 62 which is inserted into the rear side of the handlebar rod 1 and closes the rear side of the handlebar rod 1, the molding portion 61 and the closing portion 6
A mandrel 6 composed of a connecting body 63 for connecting the two is used, and after the mandrel 6 is inserted into the handle bar 1 as shown by the solid line in the figure, the front end of the handle bar 1 is inserted. Side and the molding portion 61 of the cored bar 6 are inserted into a molding die (not shown) of the coupling member 5 and a synthetic resin is injected into the molding die so that the front end side of the grip handle rod 1 is inserted. The coupling member 5 is integrally molded. Further, after the joining member 5 is molded, the joining member 5 is removed from the molding die, and the core metal 6 is removed from the grip handle rod 1.

According to the above-mentioned molding means, the fitting portion 51, the extension portion 52 and the shell-shaped fitting portion 53 of the connecting member 5 can be easily provided between the molding portion 61 of the core metal 6 and the molding die. Can be molded, and part of the synthetic resin injected into the mold,
The protrusions 54 can be easily molded by being injected into the through holes 11 of the handle bar 1, and a part of the molded part 61 is inserted into the inside of the through holes 11. Therefore, when the synthetic resin is injected, the synthetic resin can be prevented from unnecessarily invading the inside of the grip handle rod 1, without causing material loss, and the grip handle rod can be prevented. The weight increase of 1 can be prevented.

Further, at the front end of the grip handle rod 1, as shown in FIG.
As shown in FIG. 7, a closing body 7 for closing the front end opening may be attached. In such a case, the closing body 7 allows the front end of the grip handle rod 1 when the blade 2 is operated. It is possible to prevent dirt and sand from entering the inside from the opening side, and it is possible to prevent the front end side of the grip handle rod 1 from being deformed by the closing body 7, and the blade in the handle handle rod 1. It is also possible to increase the strength of the attachment part of 2.

Further, the fitting portion 5 of the connecting member 5
As shown in FIGS. 5 and 6, the front side of the cover 1 is provided with a cover 55 that covers the entire outer surface of the closing body 7 that is projected and exposed from the grip handle rod 1 to the front side. Good. In this case, the closing body 7 strengthens the strength of the front end portion of the grip handle rod 1, and while preventing the intrusion of earth and sand or the like from the front end opening side of the grip handle rod 1, The cover 55 can prevent the closing body 7 from slipping out of the grip handle rod 1. Further, in the embodiment of FIG. 5, a shell-shaped one is used as the closing body 7, and the shell-shaped fitting portion 53 and the covering portion are provided on the coupling member 5 so as to cover the entire outer periphery of the closing body 7. 55, and in such a case, the contact area of the connecting member 5 to the mounting portion 21 is further increased by the shell-shaped fitting portion 53 and the cover portion 55, and the connecting member 5 is interposed. The connection strength between the blade 2 and the grip handle rod 1 is further strengthened, and the entry of dirt and the like from the front end opening side of the grip handle rod 1 to the inside is prevented, and the grip handle rod is also provided. 1
The grip handle rod 1 of the closing body 7 while strengthening the front end side strength of the
It can be prevented from being pulled out.

Further, each through hole 1 in the grip handle rod 1
As shown in FIG. 7, a plug body 8 having a plurality of concave portions 81 facing each of the through holes 11 is inserted into the inner side of the formation of No. 1 to form a synthetic resin at the time of molding the coupling member 5. A plurality of retaining / rotating protrusions that integrate the grip handle rod 1, the coupling member 5, and the plug 8 by injecting a part of the through holes 11 into the recesses 81 of the plug 8. You may make it provide 54. In this case, when the coupling member 5 is molded, the synthetic resin unnecessarily intrudes into the grip rod 1 without closing the through holes 11 by the molding portion 61 of the core metal 6. While the stopper body 8 can prevent the grip handle rod 1 from strengthening, the strength of the grip handle rod 1 can be strengthened by the stopper body 8. Further, each of the protrusions 54 is connected from the connecting member 5 to the grip handle rod. Since it is provided so as to project into the concave portion 81 of the plug body 8 via 1, the attachment strength of the coupling member 5 to the grip handle rod 1 side can be further enhanced. In each of the above embodiments, a shovel is shown as an example of a manual tool, but the present invention can be applied to a manual tool such as a scoop other than the shovel.

[0026]

As described above, according to the first aspect of the present invention, a connecting member 5 made of a synthetic resin is integrally attached to the tip of the grip handle rod 1 by means of embedded molding. At the same time, the coupling member 5 is provided with a fitting portion 51 having a tapered outer surface that comes into surface contact with the tapered inner surface of the tubular mounting portion 21 provided on the tool body 2, while the fitting portion 51 is provided with Since the extension portion 52 extending toward the base side of the grip rod 1 is formed with respect to the end portion of the tubular mounting portion 21 when the tip end portion of the grip rod 1 is fitted into the tubular mounting portion 21, At the time of fitting the tip end portion of the grip handle rod 1 into the cylindrical mounting portion 21, the taper inner surface of the mounting portion 21 and the taper outer surface of the fitting portion 51 are made elastic by the coupling member 5 made of synthetic resin. It is possible to make a surface contact with each other without a gap and to fit them, whereby the mounting portion 21 and Serial to increase the contact area between the coupling member 5, the without the mounting portion 21 and the Nigie杆 1 or backlash, it is possible to enhance bonding strength therebetween. Moreover, in the case of excavating soil or the like, when a large load is applied to the tool body A, the load is extended to the rear end of the attachment portion 21 toward the base side of the handle bar 1. The grip rod 1 can be dispersed through the extension portion 52 of the member 5 to act on the grip rod 1, and as a result, the grip rod 1 can be generated without causing a local shear load. The strength of the rod 1 can be guaranteed for a long period of time, and even when the grip handle rod 1 is formed of a synthetic resin, a local shear load is not generated, and therefore its durability is ensured for a long period of time. You can

In the invention of claim 2, the grip handle rod 1
With the closing body 7 provided at the tip opening of the tool body 2
It is possible to prevent dirt and sand from entering the inside of the grip handle rod 1 from the opening side of the tip of the handle handle 1, and the closing body 7 can strengthen the strength of the tip of the handle rod 1. it can.

Further, in the invention of claim 3, since the connecting member 5 is formed with the cover portion 55 for covering the outer surface of the closing body 7 exposed to the grip rod 1, the closing body 7 is provided. While the strength of the tip portion of the grip handle rod 1 is strengthened and the intrusion of earth and sand or the like from the tip side of the grip handle rod 1 into the inside can be prevented, the cover body 55 allows the closing body 7 to move. It is possible to prevent the grip handle rod 1 from slipping out.

Further, in the invention of claim 4, since the connecting member 5 is provided with the shell-shaped fitting portion 53 extending toward the base side of the tubular mounting portion 21 of the tool main body 2, this shell-shaped fitting The attachment portion 21 of the coupling member 5 via the portion 53.
Further increasing the contact area with respect to the tool body 2
It is possible to further strengthen the bonding strength between the grip handle rod 1 and the grip handle rod 1.

Further, in the invention of claim 5, a through hole 11 is provided at the tip of the handle bar 1, and the connecting member 5 is made of a synthetic resin material when the connecting member 5 is molded. 11 is provided with a retaining / rotating protrusion 54 which is integrated with the handle rod 1, so that the connecting member 5 is integrally formed on the handle rod 1 side through the protrusion 54. It can be firmly connected, and when the connecting member 5 is resin-molded on the handle bar 1, a part of the synthetic resin intervenes inward from the through hole 11 provided in the handle bar 1. By so doing, the protrusion 54 can be easily molded.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a hand tool according to the present invention with a part thereof omitted.

FIG. 2 is a plan sectional view of the same.

FIG. 3 is a cross-sectional view showing a molding die used at the time of integrally molding the grip handle rod of the coupling member.

FIG. 4 is a vertical cross-sectional view showing another embodiment.

FIG. 5 is a vertical sectional view showing another embodiment of the present invention.

FIG. 6 is a vertical sectional view showing another embodiment of the present invention.

FIG. 7 is a vertical sectional view showing another embodiment of the present invention.

FIG. 8 is an overall structural diagram of a shovel shown as an example of a manual tool of the present invention.

FIG. 9 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 Grip Handle 11 Through Hole 2 Tool Main Body (Blade) 3 Coupling Pin 5 Coupling Member 51 Fitting Part 52 Extending Part 53 Bullet-Shaped Fitting Part 54 Projection 55 Covering Part 7 Closing Part 82 Operating Part

Claims (5)

[Claims] 1. A tool body (2) having a tapered cylindrical mounting portion (21) and a tubular grip handle rod (1), wherein the grip handle rod (21) is attached to the cylindrical mount portion (21). 1) A manual tool in which the tip end portion of 1) is fitted and connected by a connecting pin (3), wherein the tip end portion of the grip handle rod (1) is integrally formed with the grip handle rod (1) by means of embedded molding. A coupling member (5) made of a synthetic resin that is coupled to the coupling member (5), the coupling member (5) having a tapered outer surface that comes into surface contact with the tapered inner surface of the tubular mounting portion (21). ), The fitting portion (51) is provided at the end of the tubular mounting portion (21) when the distal end portion of the grip handle rod (1) is fitted to the tubular mounting portion (21). On the other hand, a hand tool comprising an extension portion (52) extending toward the base side of the grip handle rod (1). 2. The hand tool according to claim 1, wherein a tip end of the handle bar (1) is provided with a closing body (7) for closing the open end of the tip. 3. The hand tool according to claim 2, wherein the coupling member (5) comprises a cover (55) for covering an outer surface of the closing body (7) exposed to the handle bar (1). 4. The hand tool according to claim 1, wherein the coupling member (5) comprises a shell-shaped fitting portion (53) extending toward the base side of the tubular mounting portion (21) of the tool body (2). 5. A through hole (1) is provided at the tip of the grip handle rod (1).
1), and the coupling member (5) has a retaining member which is integrated with the grip handle rod (1) by interposing a synthetic resin material into the through hole (11) when the coupling member (5) is molded. Double stop protrusion (5
4. The hand tool according to claim 1, further comprising 4).