JP4451344B2 - handle - Google Patents

Description

  The present invention relates to a detachable handle used by being attached to a work tool to operate the work tool.

  Japanese Unexamined Patent Application Publication No. 2004-249430 (Patent Document 1) discloses an operation auxiliary tool that is used by being mounted on a main body of an electric disk grinder in order to operate the electric disk grinder used for grinding a workpiece. The structure of the auxiliary handle is disclosed. By attaching such an auxiliary handle to the electric disc grinder, the user can stably operate the work tool using the main handle and the auxiliary handle of the electric disc grinder. The auxiliary handle disclosed in Patent Document 1 is capable of rotating in all directions via a spherical surface with respect to a handle main body (mounting portion) that is fixedly mounted on the main body of the electric disc grinder. It is connected to. And between the handle body part and the grip part, an anti-vibration rubber is interposed as an anti-vibration elastic body that exerts a resilient force against the relative rotation of the grip part. According to the auxiliary handle described in Patent Document 1, vibration input to the grip portion through the handle main body portion can be reduced by the vibration proof rubber. This can reduce user fatigue and improve usability.

By the way, the structure where the outer surface of a grip part is coat | covered with the rubber | gum cover for anti-slip is common. Conventionally, the rubber cover and the anti-vibration rubber are formed separately. The rubber cover and the anti-vibration rubber are each molded using a molding die. However, the configuration in which the rubber cover and the anti-vibration rubber are separately formed requires a molding die for each, and the production cost is high. In this respect, there is still room for improvement.
JP 2004-249430 A

  The present invention has been made in view of this point, and an object of the present invention is to provide a technique that contributes to a reduction in production cost in a handle that is used by being mounted on a work tool.

In order to achieve the above object, the invention described in each claim is configured.
According to the first aspect of the present invention, the mounting portion that can be mounted on the work tool and the mounting portion are inserted, and at least relative to the mounting portion in the inserted state in the same direction as the long axis direction of the work tool. It is arranged between a hollow grip part connected in a movable manner, and a cylinder inner peripheral surface of the grip part and an outer peripheral surface of the mounting part, and provides elasticity to the relative movement operation of the grip part with respect to the mounting part. A handle having an elastic body to act is formed. The “handle” in the present invention is suitably applied to a rotary work tool such as a grinder or a polisher for rotating a disk to perform a grinding work or a polishing work on a work material. Alternatively, impact work tools such as electric hammers or hammer drills that perform crushing and drilling operations on the workpiece by performing a striking operation and a rotating operation, or a reciprocating linear motion on the blade, or a reciprocating linear motion on the blade. The present invention can be applied to a work tool with a substantially linear vibration based on the driving of a tip tool, such as a cutting work tool such as a reciprocating saw or a jigsaw that performs a cutting work.
The “same direction as the major axis direction ” does not indicate perfect coincidence, but includes a mode in which the directions are substantially the same. The “hollow shape” typically corresponds to a cylindrical shape, but the cross-sectional shape is not limited to a circle but may be a non-circular shape. In addition, as a mode of “joining so as to be relatively movable”, a mode in which the grip portion is provided so as to be linearly movable in a direction parallel to the vibration direction of the work tool, or one rotation axis in a direction parallel to the vibration direction Any of a mode of rotating around, a mode of rotating around a plurality of rotation axes intersecting with each other, and a mode of rotating around a spherical surface are suitably included. Further, when a plurality of vibrations having different input directions are input to the work tool, it is sufficient that the vibrations have at least the same direction as the vibration input direction. The “elastic body” typically corresponds to rubber or elastic resin.

In the present invention, the grip portion has an elastic member that covers the outer surface of the grip portion, and the elastic member is formed integrally with the elastic body. In addition, as an aspect which coat | covers an outer surface, both the aspect which coat | covers a part of outer surface, and the aspect which coat | covers the whole are included suitably. In addition, as an aspect of “integrally forming”, typically, an aspect in which an elastic member and an elastic body are integrally formed into a predetermined shape using a forming die corresponds to this. In this case, after the cylindrical member forming the main part of the grip portion is set in the mold in advance, the elastic member and the elastic body are integrally formed by filling and solidifying the liquid elastic material in the mold. An embodiment by insert molding is suitable, but includes an embodiment in which an elastic member and an elastic body are integrally formed using a molding die and then assembled to a cylindrical member forming the main part of the grip portion.
According to this invention, it is set as the structure which forms integrally the elastic member arrange | positioned on the outer side of a grip part, and the elastic body arrange | positioned on the inner side of a grip part, and thereby makes an elastic member and an elastic body into one component. Yes. As a result, when molding these members using a molding die, it becomes possible to manufacture with a single molding die, so there are fewer molding dies compared to the configuration in which the elastic member and the elastic body are formed separately, In addition, the number of manufacturing steps is reduced, and the production cost can be reduced.
In addition, if the grip portion is formed by, for example, the above-described insert molding, the elastic member and the elastic body are fixed to the cylindrical member forming the main body of the grip portion when the grip portion is manufactured. Is done. For this reason, in order to assemble the mounting part and the grip part into a handle, when performing a predetermined assembling work, the number of assembling steps is reduced to the extent that the work of assembling the elastic body to the grip part becomes unnecessary. As a result, the assembly of the handle is improved.

In the present invention, the grip portion is formed with a through hole extending in a direction intersecting the axial direction of the grip portion. The elastic body and the elastic member are configured to be connected to each other by a connecting portion located in the through hole. In addition, as an aspect "extending in the direction crossing the axial direction", an aspect in which the axis of the through hole is orthogonal to the axis of the grip part is preferable, but an aspect in which the axis of the through hole is inclined to the axis of the grip part, etc. Widely encompass. Further, the “through hole” can be set to an appropriate shape such as a slit or the like extending long in the axial direction or the circumferential direction of the grip portion as well as a circular shape and a square shape, and the number of the set holes is arbitrary. In the present invention, since the elastic member positioned outside the grip portion and the elastic body positioned inside are connected to each other by the connecting portion penetrating the grip portion, the grip portion long axis direction of the connecting portion set in the grip portion By changing the position of the elastic member, the position of the elastic body can be arbitrarily set, such as a position close to or connected to a connection portion of the grip portion with respect to the mounting portion. Moreover, a connection part can suppress peeling from the grip part outer surface of an elastic member, and can maintain the quality of a grip part.

(Invention of Claim 2 )
According to the second aspect of the present invention, the elastic body in the handle according to the first aspect of the present invention is configured such that when the mounting portion is inserted into the grip portion in the axial direction so as to be assembled to the grip portion, While being fitted to the outer peripheral surface of the insertion side end portion, the movement in the axial direction is restricted by the connecting portion during the fitting. According to the present invention, using the insertion operation when inserting the mounting portion into the grip portion to assemble the mounting portion, the mounting portion and the elastic body are assembled so that the assembly is rational. Further, when the mounting portion is assembled to the elastic body, the assembly work is facilitated by suppressing the movement of the elastic body.

(Invention of Claim 3 )
According to the invention described in claim 3 , the grip portion of the handle according to claim 1 or 2 is connected to the handle main body portion so as to be relatively rotatable in all directions, and the elastic body is formed of the grip portion. A resilient force is applied to the relative rotation operation in all directions with respect to the handle main body. Note that, as an aspect of “joining in all directions so as to be capable of relative rotation”, typically, a spherical bearing including a spherical portion formed on the handle body portion side and a spherical concave surface formed on the grip portion side. This is the case for connecting via the. The handle according to the present invention is configured to absorb vibration by rotating the grip portion relative to the handle main body in all directions, so that the input direction of vibration is not constant, for example, for a work tool such as a grinder or a polisher. It is effective.

  According to the present invention, a technique that contributes to a reduction in production cost is provided in a handle that is used by being attached to a work tool.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. The embodiment of the present invention will be described in the case where the anti-vibration handle is applied to an electric disc grinder as an example of a rotary work tool as an auxiliary handle for operating the electric disc grinder. 1 is a sectional view of the entire auxiliary handle attached to the electric disc grinder, FIG. 2 is a sectional view of only the auxiliary handle, and FIGS. 3 and 4 are cross sectional indication lines in FIG. A part of the auxiliary handle based is shown in cross section.

  First, an outline of the electric disk grinder 101 will be briefly described with reference to FIG. The electric disc grinder 101 has a major axis direction as a front-rear direction (left-right direction in the figure), and an outer body is constituted by a main body portion 103 including a motor housing 105 and a gear housing 107. The main body 103 corresponds to the “work tool main body” in the present invention. The motor housing 105 is formed in a substantially cylindrical shape, and a drive motor 111 is accommodated in the motor housing 105. The drive motor 111 is arranged such that the rotational axis direction thereof is the long axis direction of the electric disk grinder 101.

  In a gear housing 107 connected to the front end portion of the motor housing 105, a power transmission mechanism 113 for transmitting the rotation output of the drive motor 111 to a grindstone 115 as a tip tool is accommodated. The rotational output of the drive motor 111 is transmitted as a rotational motion in the circumferential direction to the grindstone 115 via the power transmission mechanism 113. The grindstone 115 is arranged on the front side (the left side in the figure) of the electric disk grinder 101 so that the rotation axis thereof is orthogonal to the long axis direction of the electric disk grinder 101 (rotation axis of the drive motor 111). Yes. A main handle 109 is connected to the rear end (right side in the figure) of the motor housing 105, and an auxiliary handle 121 is detachably attached to a side surface of the gear housing 107. The main handle 109 is provided so that its long axis direction is the long axis direction of the electric disc grinder 101, while the auxiliary handle 121 is so that its long axis direction is orthogonal to the long axis direction of the main handle 109. Is set. An operator grips these two handles 109 and 121 with his / her hand, and performs grinding work on the workpiece by the electric disc grinder 101.

  Next, the auxiliary handle 121 will be described with reference to FIGS. The auxiliary handle 121 is mainly composed of a generally cylindrical handle main body 123 that can be attached to and detached from a handle mounting portion 107a formed on the side surface of the gear housing 107, and a cylindrical grip portion 125 that is gripped by an operator. The handle main body 123 corresponds to the “mounting portion” in the present invention, and the grip portion 125 corresponds to the “grip portion” in the present invention. The handle mounting portion 107 a is formed by a mounting screw hole whose axial direction is a direction orthogonal to the major axis direction of the main body portion 103.

  The handle main body 123 is a substantially cylindrical member having a mounting screw portion 123a on one end side (the upper side in FIG. 2) in the major axis direction, a spherical surface portion 123b in the middle, and an engagement shaft portion 123c on the other end side. The mounting screw portion 123a, the spherical surface portion 123b, and the engagement shaft portion 123c are integrally formed continuously in the axial direction. The handle main body 123 is inserted into the grip portion 125 formed in a cylindrical shape, and a spherical concave surface in which the spherical surface portion 123b is formed on one end side (the upper side in FIG. 2) of the grip portion 125 in the long axis direction. 125a and a spherical concave surface 127a formed on the end plate 127 are fitted. As a result, the grip portion 125 is rotatable relative to the handle body portion 123 in all directions around the center of the spherical surface portion 123b on the one end side in the major axis direction. Note that the end plate 127 has a screw on the outer peripheral surface of the cylindrical portion 127b in which the concave surface 127a is formed. It is worn.

  Further, as shown in the cross-sectional view of FIG. 3, the spherical surface portion 123b of the handle main body 123 is formed with two flat portions 123d in parallel with the major axis of the handle main body 123 interposed therebetween, and grips corresponding to this are formed. Flat portions 125b are formed on the concave surfaces 125a of the portions 125, respectively. A rubber thin elastic plate 129 is interposed between the flat surfaces 123d and 125b, and the elastic plate 129 absorbs backlash caused by manufacturing errors between the handle main body 123 and the grip 125. The configuration is as follows.

  As shown in FIGS. 2 and 4, the engagement shaft portion 123 c provided on the other end side of the handle main body portion 123 is formed in a circular cross section and penetrates the central portion of the concave surface 125 a of the grip portion 125. Then, it extends into the cylindrical hole 125 c of the grip portion 125. In the cylindrical hole 125c of the grip portion 125, a generally ring-shaped vibration-proof rubber 131 is interposed between the inner peripheral surface of the cylindrical hole 125c and the outer peripheral surface of the engagement shaft portion 123c. The anti-vibration rubber 131 corresponds to the “elastic body” in the present invention. The anti-vibration rubber 131 has an engagement hole 131a extending in the axial direction at the center, and the engagement shaft portion 123c is inserted into the engagement hole 131a in a close contact manner. The anti-vibration rubber 131 is provided to absorb vibration input from the handle main body 123 to the grip 125. That is, when the grip portion 125 rotates with respect to the handle main body 123 using the spherical surface portion 123b as a rotation fulcrum, the anti-vibration rubber 131 is mainly elastic in the grip portion 125 with the handle main body 123. Grants power.

  The grip portion 125 is mainly composed of a cylindrical cylindrical body 126 made of a rigid resin material or the like, and the outer surface of the cylindrical body 126 is covered with a rubber elastic cover 133 over almost the entire area. The elastic cover 133 corresponds to an “elastic member” in the present invention. The elastic cover 133 is connected to the anti-vibration rubber 131 disposed in the cylindrical hole 125 c (the cylindrical hole of the cylindrical body 126) of the grip portion 125 via a plurality of connecting portions 135 penetrating the cylindrical body 126. That is, the elastic cover 133 and the vibration isolating rubber 131 are integrated with each other via the connecting portion 135. As shown in FIG. 4, a plurality of through holes 137 are set at appropriate intervals in the circumferential direction of the cylindrical body 126 (two cases are shown in the figure), and the diameter is orthogonal to the axial direction of the cylindrical body 126. It penetrates in the direction.

  The elastic cover 133 and the vibration isolating rubber 131 are formed by insert molding or the like using a mold, although not shown for convenience. That is, after the cylindrical body 126 is set in a molding die formed in a predetermined shape, the molding die is filled with liquid rubber and solidified, and is molded. The elastic cover 133 and the anti-vibration rubber 131 are connected via a connecting part 135 formed in the hole 137. Thus, the grip portion 125 is a single component in which the elastic cover 133 and the vibration isolating rubber 131 are fixed (joined) to the cylindrical body 126. The elastic cover 133 is set so as to wrap around an outwardly projecting flange portion 126a formed on the other end side in the axial direction of the cylindrical body 126 (the lower side in FIG. 2), thereby preventing peeling from the cylindrical body 126. Yes. Further, the cylindrical hole 125 c of the cylindrical body 126 is closed by a cap 139.

  The auxiliary handle 121 according to the present embodiment is configured as described above, and is used by being mounted on the electric disc grinder 101 as shown in FIG. The auxiliary handle 121 is mounted by screwing the mounting screw portion 123a of the handle main body portion 123 into a handle mounting portion (mounting screw hole) 107a provided in the main body portion 103 of the electric disc grinder 101. According to the auxiliary handle 121 according to the present embodiment, when vibration is generated during grinding work by the electric disk grinder 101, this vibration is input from the main body side to the grip portion 125 via the handle main body portion 123 of the auxiliary handle 121. In this case, the vibration is absorbed by the vibration absorbing action of the anti-vibration rubber 131, whereby the vibration of the grip portion 125 can be reduced. In the present embodiment, since the grip portion 125 can rotate in all directions via the spherical surface with respect to the handle main body portion 123, it is possible to accurately exhibit a vibration absorbing action against vibration whose input direction is not constant. The auxiliary handle 121 having good usability can be provided. In addition, according to the present embodiment, the grip portion 125 is configured to rotate in all directions via the spherical surface, so that there is no restriction on the mounting directionality when being mounted on the main body portion 103. A simple and low-cost configuration in which the mounting screw portion 123a is screwed into the handle mounting portion 107a can be employed.

  By the way, the assembly work of the auxiliary handle 121 according to the present embodiment is performed by inserting the handle main body portion 123 into the grip portion 125 from one end of the grip portion 125 with the engagement shaft portion 123c side first. The end plate 127 is put on the end portion of the grip portion 125, and the cylindrical portion 127b of the end plate 127 is screwed into the screw hole of the grip portion 125. At this time, the engagement shaft portion 123c of the handle main body portion 123 is inserted in close contact with the engagement hole 131a of the vibration isolating rubber 131, whereby the vibration isolating rubber 131 is connected to the outer peripheral surface of the engagement shaft portion 123c and the grip portion. It is set as the state interposed between 125 cylindrical hole inner peripheral surfaces.

In this case, according to the present embodiment, the anti-vibration rubber 131 and the elastic cover 133 provided so as to cover the outer surface of the grip portion 125 are integrated with each other when the grip portion 125 is manufactured. That is, since the grip part 125 is a single part in which the elastic cover 133 and the vibration isolating rubber 131 are fixed to the cylindrical body 126, an operation for assembling the vibration isolating rubber 131 to the grip part 125 becomes unnecessary. As a result, the number of man-hours for assembling the auxiliary handle 121 is reduced and the assemblability is improved as compared with the configuration in which the vibration isolating rubber is required to be assembled as part of the assembling operation of the auxiliary handle.
Further, when the grip portion 125 is molded using a molding die, in this embodiment, the covering cover 133 and the vibration isolating rubber 131 are integrally molded, so that only one die is sufficient. For this reason, for example, the anti-vibration rubber and the grip part are molded separately, and the number of molds is reduced and the number of manufacturing steps is reduced as compared with the structure to be assembled later, which is effective in reducing the production cost. .

  In the present embodiment, since the elastic cover 133 that is the outer member of the grip portion 125 and the vibration-proof rubber 131 that is the inner member are connected by the connecting portion 135 that penetrates the cylindrical body 126, the setting of the connecting portion 135 is performed. By changing the position, the position of the anti-vibration rubber 131 can be arbitrarily changed in the axial direction of the grip portion 125. In the illustrated embodiment, the anti-vibration rubber 131 is provided at a position near the rotation center of the grip portion 125. In this aspect, since the vibration-proof rubber 131 is close to the rotation center of the grip portion 125, the shaft length of the engagement shaft portion 123c of the handle body portion 123 can be shortened, and the handle body portion 123 is reduced in weight. As a result, the axial length of the region formed by the thin wall of the cylindrical body 126 is increased, and the cylindrical body 126 is also reduced in weight. On the other hand, the anti-vibration rubber 131 can be changed to a position away from the rotation center of the grip portion 125, that is, a position close to the cap 139 (lower side in FIG. 2). Since this position is a position where the amplitude generated by the vibration is maximized, the vibration can be efficiently absorbed with such an arrangement.

Further, according to the present embodiment, when the handle main body 123 is inserted into the grip 125 so as to be assembled with the grip 125, the engaging shaft 123c is engaged with the anti-vibration rubber 131 by using the insertion operation. The structure is inserted into the joint hole 131a, and a reasonable assembly is performed.
When the engagement shaft portion 123c is inserted into the engagement hole 131a of the vibration isolating rubber 131, that is, when the engagement shaft portion 123c and the vibration isolating rubber 131 are closely fitted to each other, A force to push the anti-vibration rubber 131 in the major axis direction acts. In the present embodiment, the anti-vibration rubber 131 is connected to the elastic cover 133 via the connecting portion 135, and the connecting portion 135 extends in a state of crossing the cylindrical body 126 in the radial direction. Acts to restrict the axial movement of the anti-vibration rubber 131. As a result, the anti-vibration rubber 131 is held in the set position, and the anti-vibration rubber 131 and the engagement shaft portion 123c can be fitted together without any trouble. Further, the connecting portion 135 acts to suppress the peeling when the elastic cover 133 of the grip portion 125 is about to peel off from the cylindrical body 126. That is, the lift of the elastic cover 133 from the outer surface of the cylindrical body 126 can be prevented, and the quality of the grip portion 125 can be maintained.

In this embodiment, the grip portion 125 gripped by the operator is connected to the hammer body portion 123 so as to be rotatable in all directions via the spherical surface portion 123b. However, the grip portion 125 is replaced with this configuration. You may change to the aspect rotated about the several rotation axis which mutually cross | intersects with respect to the hammer main-body part 123, or the aspect rotated about one rotation axis.
In the present embodiment, as an application example of the auxiliary handle 121, the case of the electric disk grinder 101 has been described. However, the auxiliary handle 121 is not limited to the electric disk grinder 101. That is, the work of processing a workpiece is performed in a form in which the tip tool performs a rotary motion, for example, a rotary work tool such as a polisher, a circular saw, a vibration drill, or a bit as a tip tool in a long axis direction or Impact work tools such as electric hammers or hammer drills that perform crushing and drilling operations on the workpiece by performing a hammering operation and a rotating operation, and further, the blades are subjected to a reciprocating linear motion on the blade. The present invention can be applied to a work tool having a substantially linear vibration based on the driving of a tip tool, such as a cutting work tool such as a reciprocating saw or a jigsaw that performs a cutting work.

Further, in the present embodiment, the anti-vibration rubber 131 is set at a position close to the rotation center of the grip portion 125, and the anti-vibration rubber 131 and the elastic cover 133 are connected to each other by the connecting portion 135 penetrating the cylindrical body 126. However, a configuration may also be adopted in which a vibration isolating rubber 131 is provided at the distal end portion (free end side) of the grip portion 125 and the cap 139 that closes the cylindrical hole 125c of the grip portion 125 is also used. In that case, in addition to the configuration in which the connecting path 135 that connects the anti-vibration rubber 131 and the elastic cover 133 is provided so as to penetrate the cylindrical body 126, the connecting path 135 is disposed so as to wrap around (cover) the axial end surface of the cylindrical body 126. A configuration is also possible.
Further, in the present embodiment, the case where the covering cover 133 and the vibration isolating rubber 131 are integrally formed including the cylindrical body 126 has been described. However, after the covering cover 133 and the vibration isolating rubber 131 are integrally formed, The structure which covers it on the cylinder 126 may be sufficient.
In this embodiment, a plurality of through holes 137 are provided in the cylindrical body 126 of the grip portion 125, but a single through hole 137 may be used.

1 is a half-cut plan view showing an overall configuration of an electric disk grinder provided with an auxiliary handle according to an embodiment of the present invention. It is sectional drawing which shows an auxiliary | assistant handle. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG.

101 Electric disc grinder (work tool)
103 Main body (work tool main body)
105 Motor housing 107 Gear housing 107a Handle mounting portion 109 Main handle 111 Drive motor 113 Power transmission mechanism 115 Grinding wheel (tip tool)
121 Auxiliary handle (handle)
123 Handle body (mounting part)
123a Mounting screw part 123b Spherical surface part 123c Engagement shaft part 123d Flat part 125 Grip part (grip part)
125a Concave surface 125b Plane portion 125c Cylinder hole 126 Cylinder 127 End plate 127a Concave surface 127b Cylinder portion 129 Elastic plate 131 Anti-vibration rubber (elastic body)
131a Engagement hole 133 Elastic cover (elastic member)
135 Connecting part 137 Through hole 139 Cap

Claims (3)

A mounting portion that can be mounted on a work tool, and a hollow shape connected to the inserted mounting portion so as to be relatively movable in at least the same direction as the long axis direction of the work tool. A handle having a grip portion, and an elastic body that is disposed between a cylinder inner peripheral surface of the grip portion and an outer peripheral surface of the mounting portion, and acts on a relative movement of the grip portion with respect to the mounting portion. Because
The grip portion has an elastic member that covers an outer surface of the grip portion,
A through hole extending in a direction intersecting the axial direction of the grip portion is formed in the grip portion, and the elastic body and the elastic member are integrally formed by being connected to each other by a connecting portion located in the through hole. handle, characterized in that there. The handle according to claim 1 ,
When the elastic body is inserted into the grip portion in the axial direction so as to assemble the mounting portion to the grip portion, the elastic body is fitted to the outer peripheral surface of the insertion-side end portion of the mounting portion by the insertion operation, and the fitting The handle is characterized in that movement in the axial direction is sometimes restricted by the connecting portion. The handle according to claim 1 or 2 ,
The grip portion is connected to the handle body portion so as to be rotatable relative to the handle body portion, and the elastic body is elastic to the relative rotation operation of the grip portion relative to the handle body portion in all directions. An anti-vibration handle characterized by being configured to apply force.

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