JP4396229B2 - Side handle and portable tool - Google Patents

Description

  The present invention relates to a portable tool having a side handle attached to a tool body, the handle having a vibration damping portion made of an elastic body such as rubber or elastomer.

  Some portable tools have a side handle that can be attached to and detached from the tool body. For example, in the case of a disc grinder having a tip tool diameter as large as 180 mm or more, it is common that the side handle 10 is attached above the tip tool 15 as shown in FIG. When working, hold the handle 13 with one hand and operate the switch 14 to drive a motor (not shown) to rotate the tip tool 15, while cutting the tool while holding the side handle 10 with the other hand. It is pressed against the material to perform operations such as grinding and cutting. That is, the grinding position and grinding load are controlled by operating the side handle 10. Therefore, loads are applied to the side handle 10 in various directions. Further, since a large vibration is transmitted to the side handle 10 along with the grinding, this vibration is transmitted to the hand and gives an unpleasant feeling to the operator. In order to alleviate this unpleasant feeling, some side handles 10 are made of an elastic body such as rubber to reduce vibration transmitted to the hand. In the case of the side handle configured as described above, the elastic body tends to be damaged or peeled off due to a load or vibration, and the handle may fall off, resulting in an accident. Therefore, preventing the handle from falling off and ensuring safety are major issues.

For example, in Japanese Patent Laid-Open No. 2001-239476, an anti-vibration handle for fixing an elastic plastic member that attenuates vibration by injection molding between a grip part which is a grip part and a fixed part fixed to a tool body. In consideration of the case where the elastic member is damaged, a plurality of configurations for preventing the grip portion from coming off are disclosed. In one embodiment, the grip portion and the fixing portion are coupled by a safety member made of a flexible material such as a wire rope. The elastic member is injection molded to surround the safety member. With such a configuration, when the elastic member is damaged, the connection between the grip portion and the fixing portion is ensured by the safety member, and the grip portion is prevented from being detached. Further, since the maximum displacement is restricted in the direction in which the grip portion is pulled, there is an effect that the elastic member is hardly damaged.
In another embodiment of the publication, as shown in FIG. 3, the safety member is formed of a hard rod 104, and discs 104a and 104b are provided at both ends of the rod, and the grip portion 103 and the fixing portion 101 side are provided. Openings 103a and 101a are provided so that the disks cannot be removed, and are joined with a gap so that they can move to some extent. The elastic member 106 is injection molded to surround the safety member 104. As for the movement of the grip portion 103, the maximum displacement is restricted in the direction of lateral displacement, the direction of tilting, the direction of pulling, and the direction of pushing, so that the elastic member 106 is not easily damaged.

In another embodiment of the publication, the safety member is formed of a movable woven cloth material, and this woven cloth material is joined to the grip portion and the fixing portion so as to surround the elastic member. . Movement of the grip portion, the direction shifted laterally, and the maximum displacement is regulated in the direction, and the pulling direction tilted, the elastic member has a Ku odd to damage.

JP 2001-239476 A

However, in any of the configurations described in Japanese Patent Laid-Open No. 2001-239476, movement in the direction in which the grip portion is twisted is not restricted. Therefore, when a force for twisting the grip portion is applied, all the twisting force is applied to the fixing portion between the elastic member, the fixing portion and the grip portion, and the fixing portion is easily peeled off or the elastic member is easily damaged. there were.

  In any of the configurations described in the publication, there is no elastic member in the grip portion of the grip portion that is directly touched by the hand, and vibration transmitted from the grip portion to the hand is still large. .

An object of the present invention is to provide a portable tool having a side handle that prevents the grip portion from coming off and is safe and has a high vibration-proofing effect.

  An object of the present invention is to provide a fixing portion attached to a tool body, a grip portion provided at a distance from the fixing portion, and provided between the fixing portion and the grip portion, and on the fixing portion and the grip portion. In a side handle having an elastic body such as an elastomer to be fixed, a substantially cylindrical sleeve is provided in one of the fixed portion and the grip portion, and the other is inserted into the sleeve with a gap therebetween. This is achieved by providing a horizontal hole in the sleeve and the shaft, and providing a pin having a smaller diameter than at least one of the horizontal holes so as to penetrate the horizontal hole.

  Another object of the present invention is to provide a fixed portion attached to the tool body, a grip portion provided at a distance from the fixed portion, and the fixed portion and the grip portion provided between the fixed portion and the grip portion. This is achieved by providing an elastic body such as an elastomer in the grip portion of the grip portion.

  A substantially cylindrical sleeve is provided on one of the fixed part and the grip part, and a substantially cylindrical shaft inserted into the sleeve with a gap is provided on the other side. A lateral hole is provided on the sleeve and the shaft, and at least one of the lateral holes. By providing a pin having a small diameter so as to penetrate the lateral hole, the following actions and effects can be achieved. That is, since the shaft 4 is inserted with a gap in the sleeve 2b, the maximum displacement in the direction in which the grip portion 3 is shifted laterally and the direction in which the grip portion 3 is tilted can be restricted. Further, since the pin 5 is inserted so as to pass through the sleeve 2b and the lateral holes 2c, 4a of the shaft 4, the maximum displacement can be restricted in the twisting direction as well as in the pulling direction and the pushing direction. As a result, the elastic body is unlikely to be peeled off or damaged regardless of the direction in which the force applied to the grip portion is applied. In addition, there is a gap between the sleeve 2b and the shaft 4, and there is also a gap between the pin 5 and the lateral hole 2c of the sleeve 2b, so that the elastic body 6 prevents it from reaching the maximum displacement in any direction. There is nothing that prevents the vibration effect, and a high vibration isolation effect can be maintained. Therefore, it is possible to provide a side handle that is safe and has a high anti-vibration effect.

  Moreover, the following operations and effects can be achieved by providing the grip portion of the grip portion with an elastic body such as an elastomer. That is, not only the vibration transmitted from the fixed part to the grip part is attenuated, but also the vibration transmitted from the grip part to the hand is attenuated, so that a higher vibration isolation effect can be obtained.

The best mode for carrying out the present invention will be described in detail with reference to FIGS. FIG. 2 is an external view showing a state in which the side handle 10 according to the present invention is attached to a disc grinder which is a kind of portable tool. FIG. 1 is a longitudinal sectional view of the side handle 10.

First, an outline of the portable tool will be described. As shown in FIG. 2 , the disc grinder includes a resin housing 12 having a motor (not shown) therein, a resin handle portion 13 connected to the rear portion of the housing 12, and a front portion of the housing 12. An aluminum casing 11 provided with a speed reduction mechanism portion (not shown) and a tip tool 15 such as a grindstone attached to the speed reduction mechanism portion (not shown) are provided. The casing 11 is provided with a female screw (not shown), and the side handle 10 is screwed into the female screw.

Next, the configuration of the side handle 10 will be described. As shown in FIG. 1 , the side handle 10 includes a fixed portion 1, a fixed shaft 2 that is a part of the fixed portion 1, a grip portion 3 that is provided at a distance from the fixed shaft 2, and the fixed shaft 2 and the grip portion. 3 and the elastic member 6 formed of a thermoplastic elastomer or the like provided around the safety member 8.

  More specifically, the fixed shaft 2 is made of metal, and a male screw portion 2 a is formed at one end and is screwed into a female screw portion (not shown) of the casing 11. A substantially cylindrical sleeve 2b is formed at the other end of the fixed shaft 2. A lateral hole 2c is provided in the middle of the sleeve 2b, and a positioning portion 2d that is two parallel surfaces is provided at the base.

  Around the fixed shaft 2, a substantially conical resin part is formed so as to be integrated, and together with the fixed shaft 2, the fixed portion 1 is formed. A portion corresponding to the bottom surface of the cone of the fixed portion 1 is substantially flat and forms a flange portion 1a.

  The shaft 4 is inserted into the sleeve 2b with a gap. The shaft 4 is made of metal and has a substantially cylindrical shape, and a horizontal hole 4a is provided at a position corresponding to the horizontal hole 2c. The horizontal hole 4a is smaller in diameter than the horizontal hole 2c and slightly smaller in diameter than the pin 5 described later. The pin 5 is inserted so as to penetrate the horizontal hole 2c and the horizontal hole 4a. The pin 5 is press-fitted into the lateral hole 4a and fixed. The safety member 8 is configured by the engagement of the sleeve 2b, the shaft 4, and the pin 5.

  The grip portion 3 is formed so as to be integrated with the opposite side of the fixed portion 1 of the shaft 4. The grip part 3 is made of resin and has a substantially cylindrical shape. One end of the grip portion 3 on the fixed portion 1 side is formed with a substantially flat surface substantially parallel to the flange portion 1a to form the flange portion 3a. A substantially cylindrical gripping portion 3b is formed continuously from the flange portion 3a. The tip of the grip portion 3b has a divergent shape and forms a tapered portion 3c.

  Between the flange part 1a and the flange part 3a, the elastic body 6 which is a thermoplastic elastomer is injection-molded. The elastic body 6 is filled and fixed between the fixed portion 1, the fixed shaft 2, the grip portion 3 and the shaft 4 without a gap. The portion of the elastic body 6 in contact with the fixed portion 1 is widened until it becomes substantially parallel to the flange portion 1a so that the elastic body 6 is hardly peeled off, and forms a fixed end 6a. A portion of the elastic body 6 in contact with the grip portion 3 is also widened to form a fixed end 6b.

  An elastic body 7 that is a thermoplastic elastomer is injection-molded on the outer periphery of the grip portion 3. The elastic body 7 is formed from the side surface of the flange portion 3a to the front of the tapered portion 3c through the grip portion 3b. The elastic body 7 and the elastic body 6 are partially connected through a groove (not shown) provided on the outer periphery of the flange 3a.

A method for forming the side handle 10 configured as described above will be described. As a first step, the fixed portion 1 is injection-molded so as to be integrated with a fixed shaft 2 manufactured in advance. A fixed shaft 2 is accommodated in the mold, and a portion corresponding to the fixed portion 1 is formed to be a cavity. First, the fixed shaft 2 is placed in a predetermined position in the mold. At this time, the position in the rotation direction is positioned at a predetermined position by the positioning portion 2d. Thereafter, a resin that is liquid at high temperature is injected into the cavity. Finally, remove the parts after the resin has hardened. Similarly, the grip part 3 is injection-molded so as to be integrated with the previously manufactured shaft 4. As a second step, the shaft 4 is inserted into the sleeve 2b, and the pin 5 is press-fitted into the lateral hole 4a so as to pass through the lateral holes 2c and 4a of the sleeve 2b and the shaft 4 to connect the sleeve 2b and the shaft 4. This operation can be performed manually using a jig or a hand press, or can be automated by automatically controlling the press. As a third stage, the elastic bodies 6 and 7 are injection molded. Similar to the injection molding in the first stage, the combination of the fixed shaft 2, the fixed portion 1, the grip portion 3, the shaft 4 and the pin 5 is placed in a predetermined position of the mold, and then becomes liquid at a high temperature. The thermoplastic elastomer is injected and solidified before being taken out. The elastic body 6 and the elastic body 7 are formed at the same time. Since both are connected at the flange 3a, the thermoplastic elastomer is easy to flow to every corner.

Next, the operation and effect will be described. Since the shaft 4 is inserted with a gap in the sleeve 2b, the maximum displacement in the direction in which the grip portion 3 is shifted laterally and the direction in which it is tilted can be regulated. Further, since the pin 5 is inserted so as to pass through the sleeve 2b and the lateral holes 2c, 4a of the shaft 4, the maximum displacement can be restricted not only in the direction of pulling and pushing the grip portion 3 , but also in the twisting direction. Accordingly, the elastic body 7 is less likely to be peeled off or damaged regardless of the direction in which the force applied to the grip portion 3 acts.

  Further, since there is a gap between the sleeve 2b and the shaft 4, and there is also a gap between the pin 5 and the lateral hole 2c of the sleeve 2b, it is elastic until reaching the maximum displacement in any direction. Nothing obstructs the anti-vibration effect of the body 6. Thereby, there exists an effect that a high anti-vibration effect can be maintained.

  Further, since the elastic body 7 is also formed on the grip portion 3 b of the grip section 3, the vibration is attenuated not only by the elastic body 6 but also by the elastic body 7. As a result, the vibration transmitted to the hand is further reduced, and the effect of improving the vibration proofing is obtained.

  From the above, it is possible to provide a side handle that is safe and has a high anti-vibration effect.

Further, since the elastic bodies 6 and 7 are configured so as to be integrally provided from between the fixed portion 1 and the grip portion 3 to the grip portion 3b of the grip portion 3 , a thermoplastic elastomer or the like that has become liquid at a high temperature during molding. It becomes easier for the elastic body to flow into every corner of the mold. This produces an effect that molding becomes easy. Furthermore, with such a configuration, even if the fixing end between the elastic body 7 and the grip portion 3 is peeled off, the fixing between the elastic body 7 and the grip portion 3b still remains. As a result, there is an effect that it is possible to avoid a dangerous state in which the grip portion 3 falls off without shaking. In combination with this configuration, if the elastic bodies 6 and 7 are integrally provided from between the fixing portion 1 and the grip portion 3 to the flange side 1a of the fixing portion 1 to the tool side, the elastic bodies 6 and 7 are fixed. even fixed end got peeling with part 1, the fixing of the elastic body 6 and the flange portion 1a of the fixed part 1 will still remains possible. Thereby, even if it does not provide the safety member 8 anew, there exists an effect that the most dangerous state that the grip part 3 falls off without being shaken can be avoided.

  Next, it will be described that the present invention is not limited to the above-described embodiments. In the above embodiment, the sleeve 2b is provided on the fixed shaft 2 side and the shaft 4 is provided on the grip portion 3 side. However, the sleeve 2b may be provided on the grip portion 3 side and the shaft 4 may be provided on the fixed shaft 2 side. I do not care. Further, although the diameter of the horizontal hole 4a is smaller than that of the horizontal hole 2c, the diameter of the horizontal hole 2c may be smaller than that of the horizontal hole 4a, and the pin 5 may be press-fitted into the horizontal hole 2c.

In the above embodiment, the end surfaces of the flange portions 1a and 3a are substantially flat. However, if the flange portions 1a and 3a are formed to be concave with respect to the elastic body 6, for example, the elastic body 6 is recessed. The area that enters and becomes fixed becomes larger. Thereby, there exists an effect that the elastic body 6 becomes more difficult to peel off.

  Further, in the above embodiment, if the fixing surface of the elastic body 7 and the grip portion 3 is provided with unevenness, the elastic body 7 and the grip portion 3 are engaged with the unevenness. Thereby, there exists an effect that it can prevent that the elastic body 7 and the grip part 3 shift | deviate relatively.

In the above embodiment, the fixed ends 6a, 6b travel outward from the substantially flat portions of the flange portions 1a, 3a, so there is a risk that something will hit the fixed ends 6a, 6b and peel off. If the portions of the flange portions 1a and 3a that are in contact with the fixed ends 6a and 6b are recessed so that the fixed ends 6a and 6b are accommodated in the concave portions, nothing will be hit. Thereby, there exists an effect that the elastic body 6 becomes more difficult to peel off.

  The present invention is not limited to application to disc grinders, but can be applied to general portable tools.

It is a longitudinal cross-sectional view which shows the side handle by this invention. It is an external appearance perspective view which shows the portable tool which has a side handle by this invention. It is a longitudinal cross-sectional view which shows the conventional side handle.

Explanation of symbols

1 is a fixing portion, 1a is a flange portion, 2 is a fixed shaft, 2a is a male screw portion, 2b is a sleeve, 2c is a horizontal hole, 2d is a positioning portion, 3 is a grip portion, 3a is a flange portion, 3b is a gripping portion, 3c is Tapered portion, 4 is a shaft, 4a is a horizontal hole, 5 is a pin, 6 is an elastic body, 6a is a fixed end, 6b is a fixed end, 7 is an elastic body, 10 is a side handle, 11 is a casing, 12 is a housing, 13 is Handle part, 14 switch, 15 tip tool, 20 portable tool, 101 fixing part, 101a opening, 103 grip part, 103a opening, 104 rod, 104a disk, 104b disk 106 is an elastic member.

Claims (2)

A fixed portion attached to the tool body, wherein a grip portion provided at a distance from the fixing portion, such as an elastomer which is molded fixed by injection molding to the outer periphery of Ma及 beauty grip portion and said fixed portion and the grip portion In the side handle having an elastic body,
The fixing portion is formed to be integral with the fixing shaft around a fixing shaft positioned substantially at the center, and has a substantially conical shape made of resin with a flange portion formed on the bottom surface. The flange portion is made of resin having a flange portion, and a substantially cylindrical sleeve is provided on one of the fixing portion and the grip portion, and a substantially cylindrical shaft is provided on the other side with a gap in the sleeve. The sleeve and the shaft are provided with a horizontal hole, a pin having a diameter smaller than at least one of the horizontal holes is provided so as to pass through the horizontal hole, and an elastic body fixed between the fixing part and the grip part is provided on the both sides. The elastic body is formed so as to expand toward the end substantially parallel to the flange portion, and the elastic body fixed to the outer periphery of the grip portion is fixed through a groove provided in the flange portion of the grip portion. Side handle, wherein a resilient member was so molded simultaneously with the molding between the parts and the grip portion. A portable tool having the side handle according to claim 1.

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