Auxiliary handle for working tool

Abstract

To provide an auxiliary handle for a working tool which can suppress vibration applied to a grip part.SOLUTION: A side handle 10 has a metallic band 22 which is wound around an outer periphery of a hammer drill and is long and elastically deformable. A base 31 of a screw shaft 30 is connected to both ends of the metallic band 22. The screw shaft 30 is inserted into a cylindrical base 40. A tip member 60 is located at a tip of the base 40, and a tip of the screw shaft 30 is threadedly engaged with the tip member 60. The base 40 is covered with a cylindrical grip 50.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an auxiliary handle that is removably attached to a power tool such as a hammer drill. [Background technology]

[0002] The hammer drills disclosed in Patent Documents 1, 2, and 3 include a main handle that a user holds with one hand and an auxiliary handle that the user holds with the other hand. The auxiliary handle has an attachment part that is attached to the outer periphery of the drill body, and a rod-shaped grip part that extends from the attachment part. In the auxiliary handle of Patent Document 1, the attachment part and the grip part are integrally formed as a single member. In the auxiliary handles of Patent Documents 2 and 3, a screw attached to the attachment part and a tightening part attached to the grip part are screwed together to form an integral handle. For this reason, vibrations generated by the power tool are easily transmitted to the grip part via the attachment part and the tightening part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6612157 [Patent Document 2] Patent No. 5280934 [Patent Document 3] Patent No. 5345988 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, there has been a need for an auxiliary handle for a power tool that can suppress vibration to the grip portion. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, an auxiliary handle for a power tool has a long, elastically deformable attachment member that is wound around the outer periphery of the power tool. A base of a screw shaft is connected to both ends of the attachment member. The screw shaft is passed through a cylindrical base. A tip member is located ahead of the base, and a tip of the screw shaft is screwed into the tip member. A cylindrical grip covers the base.

[0006] Therefore, the screw shaft is screwed into the tip member. The grip is provided as a separate member from the tip member. Therefore, vibrations of the power tool are transmitted to the attachment member, the screw shaft, and the tip member. The vibrations are transmitted from the attachment member to the screw shaft, from the base of the screw shaft to the tip, and then transmitted to the grip after passing through the tip member at the tip of the screw shaft. Therefore, the vibrations are transmitted to the grip in a damped state compared to the conventional structure. Thus, vibrations are less likely to be transmitted to the grip. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a side view of a hammer drill according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a front view of the side handle. [Diagram 3] 3 is a cross-sectional view of the side handle taken along line III-III in FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] According to another aspect of the present disclosure, an elastic body is provided between an outer circumferential surface of the base and an inner circumferential surface of the grip. Therefore, the grip is held to the base by the elastic body. The elastic body also suppresses vibrations transmitted from the base to the grip.

[0009] According to another aspect of the present disclosure, the grip is rotatably connected to the base by a connection mechanism, and therefore vibrations transmitted from the base to the grip due to rotation of the grip relative to the base can be suppressed.

[0010] According to another aspect of the present disclosure, the connecting mechanism connects the grip to the base such that the grip tilts relative to the base along the working direction of the power tool, thereby enabling the grip to efficiently suppress vibrations occurring along the direction of the power tool.

[0011] According to another aspect of the present disclosure, the elastic body is provided at a base of the grip opposite the tip member. Thus, the elastic body is provided at a position closer to the attachment member than the tip member. Therefore, one end of the grip is rotatably connected to the base by a connecting mechanism provided on the tip member side. The other end of the grip is held to the base by the elastic body. Therefore, the grip is stably held to the base. Moreover, vibrations from the power tool are not easily transmitted to the grip.

[0012] According to another aspect of the present disclosure, the connecting mechanism has a rotating shaft provided on one of the two members, the grip and the base, and a bearing portion formed on the other of the two members and rotatably holding the rotating shaft, so that the grip can rotate relative to the base by the rotating shaft and the bearing portion.

[0013] According to another aspect of the present disclosure, the tip member closes the opening of the bearing portion to hold the rotating shaft in the bearing portion, and thus the tip member constitutes a part of the connecting mechanism.

[0014] According to another aspect of the present disclosure, the rotation axis is a convex portion protruding inward from the inner peripheral surface of the grip. The bearing portion is a concave portion opening at the tip of the base. The tip of the base comes into surface contact with the abutment surface of the tip member. Therefore, the grip can be rotated relative to the base with a simple configuration of the convex portion and the concave portion. In addition, the tip member comes into surface contact with the tip of the base to close the opening of the concave portion. This makes it possible to efficiently prevent the convex portion from falling off.

[0015] According to another aspect of the present disclosure, the base has a cylindrical base body. The elastic body is bonded to an outer periphery of the base body of the base. This makes it easier to bond the elastic body to the base, and makes it possible to suppress displacement of the elastic body.

[0016] According to another aspect of the present disclosure, the tip member has a diameter larger than that of the grip, so that the hand holding the grip can be caught on the tip member to prevent it from coming off.

[0017] According to another aspect of the present disclosure, the hammer drill has an auxiliary handle, which can suppress vibrations applied to a user who uses the hammer drill by gripping the auxiliary handle, thereby reducing the burden on the user.

[0018] Next, one embodiment of the present disclosure will be described with reference to Figures 1 to 4. The hammer drill 1 shown in Figure 1 has a main body housing 2, a drill chuck 3, a main handle 4, and a side handle 10. A motor and a rotation transmission mechanism are built into the main body housing 2. The drill chuck 3 is provided so as to protrude forward from the front of the main body housing 2.

[0019] As shown in FIG. 1, a cylindrical handle attachment portion 2a is formed at the front of the main housing 2. The side handle 10 is attached to the handle attachment portion 2a. The handle attachment portion 2a has a smaller diameter than the main housing 2. This makes the handle attachment portion 2a recessed relative to the main housing 2. Therefore, the side handle 10 attached to the handle attachment portion 2a is restricted from moving axially toward the main housing 2. A substantially L-shaped locking claw 2b is formed at the front end of the main housing 2. The locking claws 2b are provided at regular intervals along the outer periphery of the front end. A dust collecting cup (not shown) is locked to the locking claw 2b. The dust collecting cup prevents dust generated by the drill bit 3a from flying toward the main housing 2.

[0020] The drill chuck 3 is attached to a tool holder (not shown) that protrudes forward from the main housing 2. A drill bit 3a is detachably attached to the tool holder. This causes the drill bit 3a to protrude forward from the drill chuck 3. The main handle 4 extends downward from the rear end of the main housing 2. The main handle 4 has a switch lever 4a. A switch body is mounted inside the rear side of the switch lever 4a. When the switch lever 4a is pulled rearward with the fingertips of the hand holding the main handle 4, the switch body is turned on and the motor is started.

[0021] The hammer drill 1 is used by a user holding the main handle 4 with one hand (e.g., the right hand) and the side handle 10 with the other hand (e.g., the left hand). As shown in Fig. 1, the side handle 10 extends in a direction intersecting the striking direction (output axis P) of the hammer drill 1. For clarity, Fig. 1 shows the side handle 10 attached in a vertical position extending downward from the main housing 2. However, the side handle 10 is usually attached and used in a horizontal position extending left or right from the main housing 2.

[0022] As shown in FIG. 2, the side handle 10 includes an attachment portion 11 and a grip portion 12. As shown in FIG. 3, the attachment portion 11 includes a cover member 21 and a metal band 22. The grip portion 12 includes a cylindrical base 40 and a grip 50 that covers the base 40. The metal band 22 is an iron member formed in a generally ring shape with both ends. Locking holes 23 are formed at both ends of the metal band 22. The base portion 31 of the screw shaft 30 is engaged with the locking holes 23. The screw shaft 30 is passed through the cylindrical base 40. The male thread portion 32 of the screw shaft 30 is screwed into the female thread portion 63 of the tip member 60. As a result, the metal band 22 is erected on the grip portion 12 via the screw shaft 30.

[0023] As shown in FIG. 3, both ends of the metal band 22 and the base 31 of the screw shaft 30 are housed in the cover member 21. By tightening the tip member 60, the metal band 22 is drawn into the cover member 21. This reduces the diameter of the ring-shaped portion of the metal band 22. By fitting this ring-shaped portion into the handle attachment portion 2a, the side handle 10 is attached to the hammer drill 1. At the end of the cover member 21, a protrusion 24 is formed that protrudes toward the inside of the metal band 22. Three protrusions 24 are formed on the front and rear sides of the metal band 22. Each protrusion 24 fits into a recess (not shown) formed in the handle attachment portion 2a of the hammer drill 1. The protrusions 24 prevent the side handle 10 attached to the handle attachment portion 2a from rotating in the circumferential direction. At the end (lower end in the figure) of the cover member 21 adjacent to the grip portion 12, a flange 25 is formed that protrudes outward in the radial direction.

[0024] As shown in FIG. 3, a locking portion 80 is integrally formed on the side of the cover member 21. The locking portion 80 has a guide member 82 that forms an internal space that opens upward in the figure. A locking member 83 is housed inside the guide member 82. A coil spring 81 is attached between the inner wall surface of the guide member 82 and the locking member 83. The elastic force of the coil spring 81 urges the locking member 83 in a direction away from the gripping portion 12. As shown in FIGS. 2 and 3, a guide hole H is formed in the guide member 82 that penetrates in the striking direction of the hammer drill 1. The guide hole H is hexagonal. A rod-shaped stopper pole (not shown) made of metal with a hexagonal cross section can be inserted into the guide hole H so as to be movable in parallel with the drill bit 3a. A user can insert the stopper pole into the guide hole H while pushing the locking member 83 against the coil spring 81.

[0025] 3, the locking member 83 is formed with a metallic engagement claw 84 and a stopper 85. The coil spring 81 biases the locking member 83 in a direction away from the gripping part 12, whereby the engagement claw 84 engages with the stopper pole passing through the guide hole H. In addition, the stopper pole is held down by the stopper 85.

[0026] As shown in Fig. 3, the base 40 has a cylindrical base body 41 that extends linearly. An expanded diameter section 42 that gradually increases in diameter from the base body 41 toward the attachment section 11 is formed at the base end (upper end in the figure) of the base body 41. As shown in Fig. 4, two recesses 43 that open toward the tip member 60 are formed at the tip end (lower end in the figure) of the base body 41.

[0027] As shown in FIG. 3, the grip 50 has a cylindrical grip body 51. A flange 52 that projects radially outward is formed at the base end (upper end in the figure) of the grip body 51. Two cylindrical protrusions 53 that protrude radially inward are formed at the tip (lower end in the figure) of the grip body 51. The protrusions 53 protrude in directions facing each other. The grip body 51 of the grip 50 is barrel-shaped with a larger diameter at the center in the axial direction compared to both side portions. This makes it easy for a user to hold the grip 50.

[0028] As shown in FIG. 3, the grip 50 is inserted from the tip side of the base 40 to cover the outer circumferential surface of the base 40. As shown in FIG. 4, the convex portion 53 of the grip 50 fits into the concave portion 43 of the base 40. As a result, the grip 50 rotates relative to the base 40 around the convex portion 53. The convex portion 53 and the concave portion 43 form a connecting mechanism L. The convex portion 53 forms the rotation axis of the connecting mechanism L, so that the number of parts can be reduced compared to a configuration in which the rotation axis is made of a separate member. The axial direction (rotation axis Q) of the convex portion 53 intersects with the impact direction (output axis P) of the hammer drill 1. As a result, the grip 50 tilts relative to the base 40 along the impact direction of the hammer drill 1. As a result, the grip 50 efficiently suppresses vibrations that occur along the impact direction of the hammer drill 1.

[0029] As shown in FIG. 3, an elastic body 70 is provided between the grip 50 and the base 40. The elastic body 70 is made of a sheet-like sponge. The elastic body 70 is attached by wrapping it around the outer periphery of the base end side of the base main body 41. Any bonding method such as double-sided tape or adhesive is used for bonding the elastic body 70. The base end of the grip 50 is supported on the base 40 via the elastic body 70. The elastic body 70 suppresses vibration transmitted from the base 40 to the grip 50. The elastic body 70 is provided at the end of the grip 50 opposite the connecting mechanism L. Since the grip 50 tilts relative to the base 40 around the connecting mechanism L, the base end side of the grip 50 tilts more than the tip side. The elastic body 70 stably supports the tilting of the base end side of the grip 50 and suppresses vibration.

[0030] As shown in FIG. 2, the tip member 60 forms a surface flush with the outer peripheral surface of the grip 50. At the tip (lower end in the figure) of the tip member 60, an expanded diameter portion 61 is formed, the diameter of which gradually increases toward the tip. The expanded diameter portion 61 causes the tip member 60 to form a conical shape that is approximately trapezoidal in side view. When the hand of the user holding the grip 50 moves toward the tip, it is caught by the expanded diameter portion 61 of the tip member 60. Therefore, the expanded diameter portion 61 prevents the hand holding the grip 50 from slipping out toward the tip. On the outer peripheral surface of the expanded diameter portion 61, a plurality of protrusions 62 are formed at regular intervals along the circumferential direction. The protrusions 62 prevent the hand holding the tip member 60 from slipping. Therefore, the user can easily turn the tip member 60.

[0031] As shown in FIG. 3, a through hole 66 through which the screw shaft 30 passes is formed in the center of the tip member 60. A female screw portion 63 is provided at the tip of the through hole 66. The tip member 60 has an abutment surface 64 that abuts against the base 40 and the tip surface (lower end surface in the figure) of the grip 50. The tip member 60 supports the grip 50 so that it does not come off the base 40. As shown in FIG. 4, the abutment surface 64 covers the recess 43 of the base 40. As a result, the internal space of the recess 43 is closed by the inner wall surface of the recess 43 and the abutment surface 64 of the tip member 60. Therefore, each convex portion 53 of the grip 50 can rotate without coming off the recess 43 of the base 40. A protruding portion 65 that protrudes toward the base 40 is formed in the center of the abutment surface 64. The protruding portion 65 is inserted inside the base 40. This makes it easy to position the tip member 60 relative to the base 40 when attaching the tip member 60.

[0032] As described above, as shown in Figure 2, the side handle 10 has a long, elastically deformable metal band 22 that is wound around the outer periphery of the hammer drill 1. The base 31 of the screw shaft 30 is connected to both ends of the metal band 22. The screw shaft 30 is passed through a cylindrical base 40. A tip member 60 is located ahead of the base 40, and the tip of the screw shaft 30 is screwed into the tip member 60. A cylindrical grip 50 covers the base 40.

[0033] Therefore, the screw shaft 30 is screwed into the tip member 60. The grip 50 is provided as a separate member from the tip member 60. Therefore, vibrations from the hammer drill 1 are transmitted to the metal band 22, the screw shaft 30, and the tip member 60. The vibrations are then transmitted from the mounting member to the screw shaft, from the base of the screw shaft to the tip, and then transmitted to the grip 50 after passing through the tip member at the tip of the screw shaft. Therefore, the vibrations are transmitted to the grip 50 in a damped state compared to the conventional structure. Thus, vibrations are less likely to be transmitted to the grip 50.

[0034] 3, an elastic body 70 is provided between the outer circumferential surface of the base 40 and the inner circumferential surface of the grip 50. Therefore, the grip 50 is held to the base 40 by the elastic body 70. The elastic body 70 suppresses vibrations transmitted from the base 40 to the grip 50.

[0035] 4, a connecting mechanism L rotatably connects the grip 50 to the base 40. Therefore, the grip 50 rotates relative to the base 40, so that vibrations transmitted from the base 40 to the grip 50 can be suppressed.

[0036] 4, a connecting mechanism L connects the grip 50 to the base 40 so that the grip 50 can tilt relative to the base 40 in the working direction of the hammer drill 1. This allows the grip 50 to efficiently suppress vibrations that occur in the direction of the hammer drill 1.

[0037] As shown in Fig. 3, the elastic body 70 is provided at the base of the grip 50 on the opposite side to the tip member 60. Therefore, the elastic body 70 is provided at a position closer to the metal band 22 than the tip member 60. Therefore, one end of the grip 50 is rotatably connected to the base 40 by a connecting mechanism L provided on the tip member 60 side. The other end of the grip 50 is held to the base 40 by the elastic body 70. Therefore, the grip 50 is held stably relative to the base 40. Moreover, vibrations from the hammer drill 1 are not easily transmitted to the grip 50.

[0038] 4, the connecting mechanism L has a rotating shaft provided on one of the two members, the grip 50 and the base 40, and a bearing portion formed on the other of the two members for rotatably holding the rotating shaft. Therefore, the grip 50 is rotatable relative to the base 40 by the rotating shaft and the bearing portion.

[0039] 4, the tip member 60 closes the opening of the bearing portion to hold the rotating shaft in the bearing portion.

[0040] As shown in Fig. 4, the rotation axis is a convex portion 53 that protrudes inward from the inner peripheral surface of the grip 50. The bearing portion is a concave portion 43 that opens at the tip of the base 40. The tip of the base 40 comes into face-to-face contact with the abutment surface 64 of the tip member 60. Therefore, the grip 50 can rotate relative to the base 40 with the simple configuration of the convex portion 53 and the concave portion 43. In addition, the tip member 60 comes into face-to-face contact with the tip of the base 40, thereby blocking the opening of the concave portion 43. This makes it possible to efficiently prevent the convex portion 53 from falling off.

[0041] 3, the base 40 has a cylindrical base main body 41. The elastic body 70 is adhered to the outer periphery of the base main body 41 of the base 40. This makes it easier to adhere the elastic body 70 to the base 40, and makes it possible to suppress displacement of the elastic body 70.

[0042] 2, the tip member 60 has a larger diameter than the grip 50. Therefore, the hand holding the grip 50 can be caught on the tip member 60 to prevent it from coming off.

[0043] As shown in Figure 1, the hammer drill 1 has a side handle 10. Therefore, vibrations applied to a user who uses the hammer drill 1 by gripping the side handle 10 can be suppressed, thereby reducing the burden on the user.

[0044] Various modifications can be made to the embodiment described above. The power tool is exemplified as the hammer drill 1 which strikes while rotating the drill bit 3a. Instead of this, it may be an impact tool such as a hammer tool used for chipping work which only strikes the tip tool.

[0045] The distal end member 60 has a circular cross section as an example. Alternatively, the distal end member 60 may have an appropriate shape such as an angular cross section. The distal end member 60 may not have the enlarged diameter portion 61.

[0046] The mounting member is exemplified by the iron metal band 22. However, instead of this, it may be made of a metal other than iron, such as aluminum, or may be made of a resin instead of a metal.

[0047] The elastic body 70 is exemplified as a sheet-like sponge. Alternatively, rubber or silicone may be used. Alternatively, the elastic body 70 may be formed in an endless ring shape. In this case, the elastic body 70 may be configured to be fitted onto the outer circumferential surface of the base main body 41 instead of being adhered thereto. The elastic body 70 may be adhered to the inner circumferential surface of the grip 50. The elastic body 70 may be provided on the tip member 60 side of the axial center of the base 40.

[0048] The connecting mechanism L may be provided closer to the metal band 22 than the axial center of the base 40. The protrusion 53 of the grip 50 is exemplified as the rotation axis of the connecting mechanism L. Alternatively, a pin separate from the grip 50 and the base 40 may be used. The protrusion 53 may be formed on the base 40, and the recess 43 may be formed on the grip 50.

[0049] The hammer drill 1 of the embodiment is an example of a power tool in one aspect of the present disclosure. The side handle 10 of the embodiment is an example of an auxiliary handle in one aspect of the present disclosure. The metal band 22 of the embodiment is an example of an attachment member in one aspect of the present disclosure. The screw shaft 30 of the embodiment is the screw shaft in one aspect of the present disclosure. The base 40 of the embodiment is the base in one aspect of the present disclosure. The tip member 60 of the embodiment is an example of a tip member in one aspect of the present disclosure. The grip 50 of the embodiment is an example of a grip in one aspect of the present disclosure.

[0050] The elastic body 70 of the embodiment is an example of an elastic body according to an aspect of the present disclosure. The connecting mechanism L of the embodiment is an example of a connecting mechanism according to an aspect of the present disclosure. The convex portion 53 of the embodiment is an example of a rotating shaft according to an aspect of the present disclosure. The concave portion 43 of the embodiment is an example of a bearing portion according to an aspect of the present disclosure. [Explanation of symbols]

[0051] 1 Hammer drill (work tool) 2 Main housing 2a Handle attachment part 2b Locking claw 3 Drill chuck 3a Drill bit 4 Main Handle 4a Switch lever P Output axis 10 Side handles (auxiliary handles, auxiliary handles for work tools) 11 Mounting part 12 Grip part 21 Cover member 22 Metal band (mounting material) 23 Locking hole 24 Protrusion 25 Flange 30 Screw shaft 31 Base 32 Male thread 40 Base 41 Base body 42 Expanded diameter part 43 Recess (bearing part) 50 Grip 51 Grip body 52 Flange 53 Convex part (rotation axis) L connection mechanism Q Rotation axis 60 Tip member 61 Expanded diameter part 62 Protrusion 63 Female thread 64 Contact surface 65 Overhang 66 Through hole 70 Elastic Body 80 Rock Section 81 Coil spring 82 Guide member 83 Locking member 84 Engagement claw 85 Stopper H Guide hole

Claims

1. An auxiliary handle for a power tool that is removably attached to the power tool, a long, elastically deformable mounting member wound around the outer periphery of the power tool; a screw shaft having a base connected to both ends of the mounting member; A cylindrical base through which the screw shaft passes; a tip member located forward of the base and into which the tip of the screw shaft is screwed; An auxiliary handle for a power tool having a cylindrical grip that covers the base.

2. 2. The auxiliary handle for a power tool according to claim 1, An auxiliary handle for a power tool, wherein an elastic body is provided between the outer peripheral surface of the base and the inner peripheral surface of the grip.

3. 3. The auxiliary handle for a power tool according to claim 1 or 2, An auxiliary handle for a power tool having a connecting mechanism that rotatably connects the grip to the base.

4. 4. The auxiliary handle for a power tool according to claim 3, The auxiliary handle for a power tool, wherein the connecting mechanism connects the grip to the base so that the grip can tilt relative to the base along a working direction of the power tool.

5. 3. The auxiliary handle for a power tool according to claim 2, The elastic body is provided at the base of the grip on the opposite side to the tip member.

6. 4. The auxiliary handle for a power tool according to claim 3, The connecting mechanism is an auxiliary handle for a power tool that has a rotating shaft provided on one of the two members, the grip and the base, and a bearing portion formed on the other of the two members and that rotatably holds the rotating shaft.

7. 7. The auxiliary handle for a power tool according to claim 6, The tip member closes the opening of the bearing portion to hold the rotating shaft in the bearing portion.

8. 7. The auxiliary handle for a power tool according to claim 6, The rotation axis is a protrusion that protrudes inward from the inner circumferential surface of the grip, the bearing portion is a recessed portion that opens at a tip end of the base, The auxiliary handle for a power tool has a tip end of the base that comes into surface contact with the contact surface of the tip member.

9. 3. The auxiliary handle for a power tool according to claim 2, The base has a cylindrical base body, The elastic body is bonded to the outer periphery of the base body of the base.

10. 3. The auxiliary handle for a power tool according to claim 1 or 2, The tip member has a diameter larger than that of the grip.

11. A hammer drill having the auxiliary handle according to claim 1 or 2.

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