Handle and work machine

Abstract

The present invention improves the convenience of a handle and a work machine. This hammer drill is provided with: a handle holder 21 that connects to a cylinder housing that extends along a first axis of a work machine body so as to be able to rotate in a first circumferential direction around the first axis; and a side handle 20 that connects to the handle holder 21 so as to be able to rotate in a second circumferential direction. Furthermore, the hammer drill is provided with a fixing section 9 that can fix the handle holder 21 to the cylinder housing and can fix the side handle 20 to the handle holder 21. The fixing section 9 allows independent adjustment of a first fixing force for fixing the handle holder 21 to the cylinder housing and a second fixing force for fixing the side handle 20 to the handle holder 21.

Description

Handle and work machine

[0001] The present invention relates to a handle and a work machine to which the handle is attached.

[0002] As an example of a work machine, a power tool has been proposed that includes an electric motor, a tool body that supports the electric motor, and a side handle that is attached to the tool body.

[0003] As an example of the power tool described above, Patent Document 1 discloses a handheld power tool having a side handle equipped with a band that is wrapped around the tool body and a handle holder that holds one end and the other end of the band and to which a handle is attached.

[0004] JP 2012-40623 A

[0005] In the above-described handheld power tool, the band is fastened to the tool body during operation, so the band cannot be rotated around the striking axis of the tool body, which means that the handle holder cannot be rotated around the striking axis during operation.

[0006] However, some users desire to improve the ease of use of the work machine by allowing the handle holder to rotate freely around the impact axis during work.

[0007] An object of the present invention is to provide a handle and a work machine with improved convenience.

[0008] A handle in one embodiment is a handle attached to a work machine body, and comprises: a base portion connected to a columnar portion extending along a first axis of the work machine body so as to be rotatable in a first circumferential direction centered on the first axis; a grip portion connected to the base so as to be rotatable in a second circumferential direction centered on a second axis intersecting the first axis; and a fixing portion capable of fixing the base to the columnar portion and fixing the grip portion to the base, wherein the fixing portion is capable of independently adjusting a first fixing force fixing the base to the columnar portion and a second fixing force fixing the grip portion to the base.

[0009] A work machine according to one embodiment is a work machine having a work machine main body and a handle attached to the work machine main body, wherein the work machine main body has a motor and a columnar portion extending in a first axial direction, to which a tool tip driven by the driving force of the motor is attached, and the handle comprises a base portion rotatably connected to the columnar portion in a first circumferential direction centered on the first axis, a grip portion rotatably connected to the base in a second circumferential direction centered on a second axis intersecting the first axis, and a fixing portion capable of fixing the base to the columnar portion and fixing the grip portion to the base, wherein the fixing portion can individually release the fixation of the base to the columnar portion and the fixation of the grip portion to the base.

[0010] According to the present invention, the convenience of the handle and the work machine can be improved.

[0011] 1. A perspective view showing the structure of a working machine according to a first embodiment of the present invention when the area around the cylinder is fixed. 2. A side view showing the structure of the working machine of FIG. 1. 3. A cross-sectional view showing the structure cut along line A-A in FIG. 2. 4. A cross-sectional view showing the structure cut along line B-B in FIG. 2. 5. A perspective view showing the structure of the working machine of FIG. 1 when rotating around the cylinder. 6. A cross-sectional view showing the structure of the working machine of FIG. 5 cut along the same line as line A-A in FIG. 2. 7. A cross-sectional view showing the structure of the working machine of FIG. 5 cut along the same line as line B-B in FIG. 2. 8. An exploded perspective view and a partially enlarged perspective view of the handle holder, side handle, and change lever of the working machine shown in FIG. 1. 9. A plan view showing the structure of the lower hinge of the handle holder of FIG. 8. 10. A perspective view showing the structure of the change lever of FIG. 8. 11. A side view showing the structure of the change lever of FIG. 10. 12. A cross-sectional view showing the structure cut along line A-A in FIG. 12. 13. A perspective view showing the structure of the working machine of embodiment 2 of the present invention when the area around the cylinder is fixed. 14. A side view showing the structure of the working machine of FIG. 14. 15. A perspective view showing the structure of the working machine of FIG. 14 when rotating around the cylinder. 22. A side view showing the structure of the work machine of FIG. 16. An exploded perspective view and a partially enlarged perspective view of the band, side handle, and change lever of the work machine shown in FIG. 14. A perspective view showing the structure of the change lever of FIG. 18. A plan view showing the structure of the change lever of FIG. 19. A side view showing the structure of the change lever of FIG. 19. A perspective view showing the structure of the handle holder, side handle, and change lever of a modified work machine when fixed around the bolt shaft. A partially enlarged perspective view showing the structure of part A of FIG. 22. An exploded perspective view and a partially enlarged perspective view of the handle holder, side handle, and change lever of FIG. 22. A side view showing the structure of the handle holder, side handle, and change lever of FIG. 22. A cross-sectional view showing the structure cut along line B-B of FIG. 25. A partially enlarged perspective view showing the structure of part A of FIG. 22 when rotated around the bolt shaft. A cross-sectional view showing the structure of the structure of FIG. 22 when rotated around the bolt shaft, cut at the same place as line B-B of FIG. 25.

[0012] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[0013] In this embodiment, a hammer drill is taken as an example of a work machine, and the hammer drill and a side handle (handle) attached to the hammer drill will be described.

[0014] The use of the hammer drill according to this embodiment is not particularly limited, but it is suitable for chipping and breaking down objects such as concrete walls and stone.

[0015] (Embodiment 1) As shown in Figures 1 and 2, a hammer drill (working machine) 10 is capable of attaching and detaching a tool tip 8, such as a bit. The hammer drill 10 includes a working machine body 1, an impact mechanism 18 incorporated inside the working machine body 1, a main handle 2 connected to the working machine body 1, and another handle 6 separate from the main handle 2. The working machine body 1 is composed of a cylinder housing 1a, an intermediate housing 1b, and a motor housing 1c, which are fixed to one another and integrated. The cylinder housing 1a is cylindrical overall. The intermediate housing 1b and the motor housing 1c are disposed between one longitudinal end of the cylinder housing 1a and the main handle 2.

[0016] In the following description, the longitudinal direction of the cylinder housing 1a is defined as the front-rear direction P1. Of the two longitudinal sides of the cylinder housing 1a, the side where the intermediate housing 1b and the motor housing 1c are located is defined as the rear, and the opposite side is defined as the front. In other words, the intermediate housing 1b and the motor housing 1c are located between the rear end of the cylinder housing 1a and the main handle portion 2.

[0017] The intermediate housing 1b and the motor housing 1c are stacked one on top of the other, with one end of the main handle portion 2 connected to the motor housing 1c and the other end of the main handle portion 2 connected to the intermediate housing 1b. In the following description, the other end of the main handle portion 2 connected to the intermediate housing 1b is defined as the upper end, and the one end of the main handle portion 2 connected to the motor housing 1c is defined as the lower end. In other words, the direction in which the main handle portion 2 extends is defined as the up-down direction Q1, which is perpendicular to the front-rear direction P1. Furthermore, the direction perpendicular to both the front-rear direction and the up-down direction is defined as the left-right direction R1.

[0018] A handle 6, which is separate from the main handle portion 2, is attached to the work machine body 1. The handle 6 includes a side handle 20, which is a sub-handle. When chipping or crushing an object, an operator often handles the main handle portion 2 and the side handle 20 of the work machine body 1 to perform the work.

[0019] 2, the cylinder housing 1a is a columnar part extending along the first axis C1 of the work machine body 1, and a tool holder 7 is provided at the tip of the cylinder housing 1a. The tool 8 is attached to the tool holder 7 so as to protrude from the tool holder 7.

[0020] The motor housing 1c also accommodates an electric motor 19, which serves as a power source. That is, the motor 19 is supported by the motor housing 1c. The motor 19 is, for example, an inner rotor brushless motor.

[0021] Furthermore, an impact mechanism 18 is provided inside the cylinder housing 1 a and the intermediate housing 1 b. The impact mechanism 18 is operated by the driving force of a motor 19. The impact mechanism 18 transmits the driving force of the motor 19 to the tool bit 8.

[0022] The tool bit 8 has a generally cylindrical shape extending along the first axis C1, and moves in the forward and backward directions P1 via the impact mechanism 18 by the driving force of the motor 19. In other words, the tool bit 8 is driven by the driving force of the motor 19 and is a bit that performs a desired operation.

[0023] A power cable 3 is attached to the lower end of the main handle 2 and is connected to a commercial power source. A trigger 5 is provided on the main handle 2, and when the operator operates the trigger 5, a motor 19 is activated. When the motor 19 is activated, the driving force of the motor 19 is transmitted to the tool bit 8 via the impact mechanism 18, causing the tool bit 8 to move in the forward / backward direction P1. In other words, an impact force is transmitted to the tool bit 8. As a result, the tool bit 8 performs the desired work on the target object.

[0024] Next, the handle 6 attached to the work machine body 1 of the hammer drill 10 will be described. As shown in FIGS. 1 to 4 , the handle 6 is a sub-handle and includes a handle holder (base) 21 rotatably connected to the cylinder housing (columnar portion) 1a in a first circumferential direction U1 about a first axis C1, and a side handle (grip) 20 rotatably connected to the handle holder 21 in a second circumferential direction U2 about a second axis C2 intersecting the first axis C1. The handle 6 further includes a fixing portion 9 that can fix the handle holder 21 to the cylinder housing 1a and can fix the side handle 20 to the handle holder 21. In other words, the handle 6 includes the handle holder 21, the side handle 20, and the fixing portion 9.

[0025] The handle holder 21 is attached to the cylinder housing 1a of the work machine main body 1 and is formed in a generally annular shape. The side handle 20 is gripped by the operator and includes a generally D-shaped handle main body 20a, an upper support portion 20b provided at one end of the handle main body 20a, and a lower support portion 20c provided at the other end of the handle main body 20a. The fixing portion 9 includes a bolt 9a (see FIG. 8 ) that fixes the handle holder 21 and the side handle 20, and a grip 9b that fits onto the bolt 9a and is rotatable in the second circumferential direction U2.

[0026] The fixing part 9 can independently adjust the first fixing force that fixes the handle holder 21 to the cylinder housing 1a and the second fixing force that fixes the side handle 20 to the handle holder 21. In other words, the fixing part 9 can independently adjust the strength or weakness of the fixing force that fixes the handle holder 21 to the cylinder housing 1a and the fixing force that fixes the side handle 20 to the handle holder 21.

[0027] On the other hand, the fixing portion 9 can individually release the fixation of the handle holder 21 to the cylinder housing 1a and the fixation of the side handle 20 to the handle holder 21. In other words, the fixation of the handle holder 21 to the cylinder housing 1a and the fixation of the side handle 20 to the handle holder 21 can be released separately.

[0028] Here, the engagement relationship between the handle holder 21, the side handle 20 and the fixing portion 9 will be described.

[0029] The handle holder 21 has an arc shape extending in the first circumferential direction U1 along the outer peripheral surface 4 of the cylindrical cylinder housing 1a, and includes an arc-shaped upper hinge (first member) 21a and an arc-shaped lower hinge (second member) 21c. The upper hinge 21a and the lower hinge 21c are rotatably connected by connecting portions 21e, 21f provided at their ends, and form an arc shape so that the upper hinge 21a and the lower hinge 21c can sandwich the cylindrical cylinder housing 1a.

[0030] The arc-shaped upper hinge 21a has a connecting portion 21e at one end and a disk-shaped one end 21b at the end opposite to connecting portion 21e. On the other hand, the arc-shaped lower hinge 21c has a connecting portion 21f at one end and a disk-shaped other end 21d at the end opposite to connecting portion 21f. In other words, the handle holder 21 comprises the arc-shaped upper hinge 21a having the disk-shaped one end 21b and the arc-shaped lower hinge 21c having the disk-shaped other end 21d, as well as connecting portions 21e and 21f that connect the upper hinge 21a and the lower hinge 21c so that they can move toward and away from each other.

[0031] The side handle 20 includes a handle body 20a, an upper support portion 20b, and a lower support portion 20c, and the upper support portion 20b is engaged with one end 21b of an upper hinge 21a of the handle holder 21. The lower support portion 20c is engaged with the other end 21d of the lower hinge 21c of the handle holder 21.

[0032] 8, the fixing part 9 includes a bolt 9a, a grip 9b that fits with the bolt 9a, and a change lever (limiting part) 22 that is disposed between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c. In other words, the change lever 22 is sandwiched between the disk-shaped one end 21b of the upper hinge 21a and the disk-shaped other end 21d of the lower hinge 21c.

[0033] The change lever 22 is sandwiched between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c, and limits the approach between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c. In detail, the change lever 22 sets the lower limit of the inner diameter D1 (see FIG. 4) of the handle holder 21, and changes the lower limit of the inner diameter D1 (see FIG. 4) of the handle holder 21 by changing its direction between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c.

[0034] In the fixing portion 9, when the grip 9b is turned in a predetermined second circumferential direction U2 to loosen the screw fastening by the bolt 9a, the gap between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c increases, making it possible to rotate the change lever 22 along the second circumferential direction U2. When the grip 9b is turned in the opposite second circumferential direction U2 to tighten the screw fastening by the bolt 9a, the gap between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c decreases, making it possible to fix the change lever 22 so that it does not rotate.

[0035] The orientation of the change lever 22 in the second circumferential direction U2 differs by 90 degrees between the hammer drill 10 shown in Figures 1 to 4 and the hammer drill 10 shown in Figures 5 to 7. That is, in the hammer drill 10 of the first embodiment, by rotating the change lever 22 in the second circumferential direction U2 to change its orientation by 90 degrees, the distance between the one end 21 b of the upper hinge 21 a and the other end 21 d of the lower hinge 21 c can be increased or decreased depending on the shape of the change lever 22. The structure of the change lever 22 will be described later.

[0036] In the structure of the hammer drill 10 shown in Figures 1 to 4, the change lever 22 is oriented in a predetermined direction (front-rear direction P1) in the second circumferential direction U2, and the shape of the change lever 22 narrows the gap between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c. In this case, the lower limit of the inner diameter D1 of the handle holder 21, which is made up of the upper hinge 21a and the lower hinge 21c, is set to be slightly smaller than the outer diameter of the cylinder housing 1a. Therefore, when the grip 9b is tightened, the gap between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c narrows, and as a result, the handle holder 21, which is made up of the upper hinge 21a and the lower hinge 21c, is tightened relative to the cylinder housing 1a, and the handle holder 21 is fixed without rotating in the first circumferential direction U1 of the cylinder housing 1a.

[0037] On the other hand, in the structure of the hammer drill 10 shown in Figures 5 to 7, the change lever 22 is rotated 90° in the second circumferential direction U2 with respect to the predetermined direction, and the shape of the change lever 22 causes the distance between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c to be wider than in the structure shown in Figures 1 to 4. In this case, the lower limit of the inner diameter D1 of the handle holder 21, which is made up of the upper hinge 21a and the lower hinge 21c, is set slightly larger than the outer diameter of the cylinder housing 1a. In other words, the lower limit of the inner diameter D1 of the handle holder 21 in the state shown in Figures 5 to 7 is larger than the lower limit of the inner diameter D1 of the handle holder 21 in the state shown in Figures 1 to 4. In other words, the distance between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c of the handle holder 21 in the state shown in Figures 5 to 7 is larger than the distance between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c of the handle holder 21 in the state shown in Figures 1 to 4. Therefore, the inner circumferential surface of the handle holder 21 is slightly spaced from the outer circumferential surface 4 of the cylinder housing 1a, and the handle holder 21 can be rotated in the first circumferential direction U1 relative to the cylinder housing 1a.

[0038] Next, the detailed structures of the handle holder 21, the side handle 20, and the fixing portion 9 will be described with reference to FIG.

[0039] In the handle holder 21, the upper hinge 21a and the lower hinge 21c are rotatably connected to each other by pins 21g at their respective connecting portions 21e, 21f. The handle holder 21 and the side handle 20 are fixed by a fixing portion 9. Specifically, from the top, the upper support portion 20b of the side handle 20, the upper handle cap 9c, one end portion 21b of the upper hinge 21a of the handle holder 21, the change lever 22, the other end portion 21d of the lower hinge 21c of the handle holder 21, the lower handle cap 9e, and the lower support portion 20c of the side handle 20 are arranged, and a bolt 9a is inserted through these.

[0040] Specifically, the bolt 9a is inserted through the upper support portion 20b of the side handle 20 and the through-hole 20e of the fitting portion 20g provided on the underside of the upper support portion 20b, the through-hole 9h of the upper handle cap 9c, the through-hole 21m of one end 21b of the upper hinge 21a, and the through-hole 22b of the change lever 22 (see FIG. 10). Furthermore, the bolt 9a is inserted through the through-hole 21n of the other end 21d of the lower hinge 21c, the through-hole 9i of the lower handle cap 9e, and the through-hole 20f of the fitting portion 20d provided on the top surface of the lower support portion 20c of the side handle 20. The tip of the bolt 9a is then screwed into the threaded hole 9g of the grip 9b. In other words, the upper handle cap 9c, one end 21b of the upper hinge 21a of the handle holder 21, the change lever 22, the other end 21d of the lower hinge 21c of the handle holder 21, and the lower handle cap 9e are arranged between the upper support part 20b and the lower support part 20c of the side handle 20 through the bolt 9a.

[0041] Since the screw hole 9g of the grip 9b is threadedly engaged with the bolt 9a, when the grip 9b is rotated to tighten, the gap between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c of the handle holder 21 becomes narrower. On the other hand, when the grip 9b is rotated to loosen, the gap between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c of the handle holder 21 becomes wider.

[0042] Note that an uneven portion 9d is formed on the underside of the upper handle cap 9c, and an uneven portion 21h is also formed on the upper surface of one end 21b of the upper hinge 21a, so that the uneven portion 9d of the upper handle cap 9c engages with the uneven portion 21h of one end 21b of the upper hinge 21a. Meanwhile, an uneven portion 9f is formed on the upper surface of the lower handle cap 9e, and an uneven portion 21i is also formed on the underside of the other end 21d of the lower hinge 21c, so that the uneven portion 9f of the lower handle cap 9e engages with the uneven portion 21i of the other end 21d of the lower hinge 21c. Furthermore, a hexagonal groove into which the fitting portion 20g is fitted is formed on the upper surface of the upper handle cap 9c, and a hexagonal groove into which the fitting portion 20d is fitted is also formed on the underside of the lower handle cap 9e.

[0043] Therefore, when the uneven portion 9d of the upper handle cap 9c is engaged with the uneven portion 21h of one end 21b of the upper hinge 21a, the upper support portion 20b of the side handle 20 is fixed. Similarly, when the uneven portion 9f of the lower handle cap 9e is engaged with the uneven portion 21i of the other end 21d of the lower hinge 21c, the lower support portion 20c of the side handle 20 is also fixed. In other words, when the uneven portion 9d of the upper handle cap 9c is engaged with the uneven portion 21h of one end 21b of the upper hinge 21a and the uneven portion 9f of the lower handle cap 9e is engaged with the uneven portion 21i of the other end 21d of the lower hinge 21c, the side handle 20 is fixed and does not rotate in the second circumferential direction U2 in FIG. 1.

[0044] The structure of the change lever (restriction portion) 22 will now be described with reference to Figures 10 to 13. The change lever 22 is formed in a generally plate-like shape and includes an annular portion 22a. The annular portion 22a is formed with a convex portion (first thick portion) 22c and a concave portion (second thick portion) 22d that is thinner than the convex portion 22c. Specifically, in a plan view of the annular portion 22a, a pair of convex portions 22c are disposed opposite each other, and a pair of concave portions 22d are also disposed opposite each other. As shown in Figure 12, the pair of convex portions 22c and the pair of concave portions 22d are disposed at positions that are rotated 90 degrees apart on the annular portion 22a in a plan view.

[0045] As shown in Fig. 8, the annular portion 22a of the change lever 22 is interposed between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c, and is sandwiched between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c as shown in Figs. 1 to 7. As shown in Figs. 8 and 9, a pair of convex portions 21j and a pair of concave portions 21k are provided on the upper surface of the other end 21d of the lower hinge 21c. The pair of convex portions 21j and the pair of concave portions 21k are positioned at 90° angles to each other at the other end 21d in a plan view (see Fig. 9).

[0046] 1 to 4, when the change lever 22 engages with the upper surface of the other end 21d of the lower hinge 21c, the two recesses 21k of the other end 21d engage with the two protrusions 22c of the change lever 22, and the two protrusions 21j of the other end 21d engage with the two recesses 22d of the change lever 22. In other words, because the recesses and protrusions of the other end 21d engage with the recesses and protrusions of the change lever 22, the distance between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c is narrow. In other words, one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c are close to each other.

[0047] 5 to 7, the two protrusions 21j of the other end 21d abut against the two protrusions 22c of the change lever 22, while the two recesses 21k of the other end 21d face each other without engaging with the two recesses 22d of the change lever 22. In other words, the recesses and protrusions of the other end 21d do not mesh with the recesses and protrusions of the change lever 22, but the two protrusions 21j of the other end 21d abut against the two protrusions 22c of the change lever 22, resulting in a wider gap between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c. In other words, the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c are spaced apart. In other words, the change lever 22 rotates and changes direction between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c, thereby adjusting the amount of proximity between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c.

[0048] Then, by changing the orientation of the change lever 22 by 90° and widening the gap between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c, a small gap is provided between the inner circumferential surface of the handle holder 21 and the outer circumferential surface 4 of the cylinder housing 1a, thereby making it possible to rotate the handle holder 21 relative to the cylinder housing 1a. In other words, by changing the orientation of the change lever 22, it is possible to switch between allowing and not allowing the handle holder 21 to rotate relative to the cylinder housing 1a, regardless of whether the side handle 20 can rotate in the second circumferential direction U2.

[0049] As described above, in the hammer drill 10 of the first embodiment, the handle holder 21 can be switched between rotatable and unrotatable relative to the cylinder housing 1a by loosening the grip 9b to an extent that the change lever 22 can be moved and then rotating the change lever 22 by 90° in the first circumferential direction U1 to change the orientation of the change lever 22 by 90°. In other words, the handle holder 21 can be switched between rotatable and unrotatable relative to the cylinder housing 1a by operating the change lever 22 alone, regardless of whether the side handle 20 can be rotated in the second circumferential direction U2.

[0050] In other words, in the hammer drill 10 of the first embodiment, the fixing part 9 can independently adjust the first fixing force that fixes the handle holder 21 to the cylinder housing 1a and the second fixing force that fixes the side handle 20 to the handle holder 21. In other words, with the second fixing force that fixes the side handle 20 fixed, the magnitude of the first fixing force that fixes the handle holder 21 can be adjusted using the change lever 22. Conversely, with the first fixing force that fixes the handle holder 21 fixed, the magnitude of the second fixing force that fixes the side handle 20 can also be adjusted using the grip 9b.

[0051] Furthermore, the first and second fixing forces of the fixing part 9 can be simultaneously adjusted by a single fixing action (rotational action of loosening or tightening the grip 9b) by the operator. In other words, the operator can adjust the magnitude of the first fixing force, which is the fixing force for fixing the handle holder 21, and also the magnitude of the second fixing force, which is the fixing force for fixing the side handle 20, simply by loosening or tightening the grip 9b.

[0052] Therefore, in the hammer drill 10 of this embodiment 1, the magnitude of the first fixing force and the magnitude of the second fixing force can be adjusted separately, and the magnitude of the first fixing force and the magnitude of the second fixing force can also be adjusted simultaneously.

[0053] In the hammer drill 10, a first fixed state is a state in which the handle holder 21 is fixed to the cylinder housing 1a and the side handle 20 is fixed to the handle holder 21, and a second fixed state is a state in which the first fixing force is smaller than the first fixing force in the first fixed state. In this case, the fixing unit 9 can select a plurality of fixing states including the first and second fixed states. For example, the fixing unit 9 can be adjusted to a plurality of fixing states including the first fixed state in which both the handle holder 21 and the side handle 20 are fixed, and the second fixed state in which only the side handle 20 is fixed without the handle holder 21 being fixed.

[0054] 4 and 7, the fixing portion 9 brings one end 21b and the other end 21d of the handle holder 21 closer to each other in the first circumferential direction U1 (see FIG. 1) to reduce the inner diameter D1 of the handle holder 21, thereby increasing the first fixing force with which the handle holder 21 tightens the cylinder housing 1a. That is, the fixing portion 9 brings one end 21b and the other end 21d of the handle holder 21 closer to each other to reduce the inner diameter D1 of the handle holder 21, thereby increasing the first fixing force of the handle holder 21 tightening the cylinder housing 1a.

[0055] Furthermore, when one end 21b and the other end 21d of the handle holder 21 are brought close to each other in the second axial direction C2, the fixing part 9 presses the side handle 20 in the second axial direction C2 against the handle holder 21, thereby increasing the second fixing force. In other words, when one end 21b and the other end 21d of the handle holder 21 are brought close to each other, the fixing part 9 tightens the grip 9b so that the upper support part 20b and the lower support part 20c of the side handle 20 are brought close to each other, thereby increasing the second fixing force that is the fixing force of the side handle 20.

[0056] The fixing part 9 has a change lever (limiting part) 22 that limits the first fixing force, which is the fixing force of the handle holder 21, by regulating the amount of proximity between one end 21b and the other end 21d of the handle holder 21. In other words, as described above, the fixing part 9 has the change lever 22 that is interposed between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c, and is sandwiched between the one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c.

[0057] The change lever 22 is interposed between the one end 21b and the other end 21d of the handle holder 21 to regulate the amount of approach between the one end 21b and the other end 21d. Furthermore, the change lever 22 adjusts the amount of approach between the one end 21b and the other end 21d depending on whether its convex portion (first thick portion) 22c or concave portion (second thick portion) 22d engages with the convex portion (predetermined portion) 21j of the one end 21b or the other end 21d of the handle holder 21.

[0058] In other words, by rotating the change lever 22 in the first circumferential direction U1 to change its orientation, the amount of proximity between the one end 21b and the other end 21d of the handle holder 21 can be adjusted, and this makes it possible to increase or decrease the first fixing force that fixes the handle holder 21 to the cylinder housing 1a. In other words, by changing the orientation of the change lever 22, the handle holder 21 can be fixed so that it does not rotate with respect to the cylinder housing 1a, or the handle holder 21 can be separated from the cylinder housing 1a so that it can rotate with respect to the cylinder housing 1a.

[0059] According to the hammer drill 10 of the first embodiment, the handle holder 21 can be rotated in the first circumferential direction U1 relative to the cylinder housing 1a while the movement of the side handle 20 is fixed. Therefore, the handle holder 21 can be freely rotated about the striking axis (first circumferential direction U1) during work, improving the ease of use (handling) of the hammer drill 10. This improves the convenience of the handle 6 and the hammer drill 10.

[0060] In other words, the handle holder 21 can be switched between rotating and fixed relative to the cylinder housing 1a according to the user's preference and the type of work being performed.

[0061] Furthermore, the side handle 20 can be switched between rotatable and fixed positions independently of the rotation and fixation of the handle holder 21 relative to the cylinder housing 1a. That is, the rotation and fixation of the handle holder 21 and the rotation and fixation of the side handle 20 can be switched independently of each other. For example, it is possible to select to fix the position of only the side handle 20 while keeping the handle holder 21 rotatable, or to fix the rotation of the handle holder 21 while allowing the side handle 20 to rotate, thereby improving the ease of use and workability of the hammer drill 10 for the operator.

[0062] (Embodiment 2) The hammer drill (working machine) 10 used in this embodiment 2 is the same as the hammer drill 10 described in the embodiment 1, so a description of its structure will be omitted.

[0063] The second embodiment differs from the first embodiment in the structure of the handle 6 that can be attached as a sub-handle to the work machine body 1 of the hammer drill 10. The handle 6 of the second embodiment shown in Figures 14 to 17 includes an annular band (base) 26, a D-shaped side handle (grip) 20, and a fixing part 9 that fixes the band 26 and the side handle 20. In other words, the handle 6 is made up of the band 26, the side handle 20, and the fixing part 9. The structure of the side handle 20 is also the same as that of the side handle 20 of the first embodiment, so a description of its structure will be omitted.

[0064] The band 26 of the second embodiment will now be described. The band 26 is a portion that is attached to the outer peripheral surface 4 of the cylindrical cylinder housing 1a of the work machine main body 1, and is formed in a generally annular shape as shown in Figure 18. The band 26 is made of metal and has a generally annular band main body 26a, a disk-shaped upper band support portion 24 provided at one end of the band main body 26a, and a disk-shaped lower band support portion 25 provided at the other end of the band main body 26a. An upper band holder 26b for attaching the upper band support portion 24 is provided at one end of the band main body 26a, and a lower band holder 26c for attaching the lower band support portion 25 is provided at the other end.

[0065] The upper band holder 26b at one end of the band main body 26a is formed with a bent portion 26d that fits with the upper band support portion 24. The lower band holder 26c at the other end of the band main body 26a is formed with a bent portion 26e that fits with the lower band support portion 25. As a result, the upper band support portion 24 that fits with the bent portion 26d is attached to one end of the band main body 26a. The lower band support portion 25 that fits with the bent portion 26e is attached to the other end of the band main body 26a. A through hole 26f is formed in the upper band holder 26b, and a through hole 26g is formed in the lower band holder 26c.

[0066] An uneven portion 24a is formed on the upper surface of the upper band support portion 24, and a through-hole 24c is formed in the center thereof. On the other hand, an uneven portion 25a is formed on the lower surface of the lower band support portion 25, and a through-hole 25c is formed in the center thereof.

[0067] Next, the fixing portion 9 of the second embodiment will be described.

[0068] The fixing part 9 includes a bolt 9a, a grip 9b that fits onto the bolt 9a, and a change lever (limiting part) 23 that is disposed between an upper band holder 26b and a lower band holder 26c of the band main body 26a. The change lever 23 is sandwiched between the upper band holder 26b and the lower band holder 26c, and is moved by sliding between the upper band holder 26b and the lower band holder 26c. In other words, the change lever 23 switches between fixing and rotating the band 26.

[0069] 19 to 21, the change lever (restricting portion) is generally plate-shaped and has a thick portion (first thick portion) 23b and a thin portion (second thick portion) 23c. Furthermore, a long hole 23a is formed through the center.

[0070] In addition, to prevent the change lever 23 from rotating when sliding it between the upper band holder 26b and the lower band holder 26c, the upper band support portion 24 is provided with a wall portion 24b that guides the sliding of the change lever 23, and furthermore, the lower band support portion 25 is also provided with a wall portion 25b that guides the sliding of the change lever 23.

[0071] 14 and 15, when the thin portion 23c of the change lever 23 is placed between the upper band holder 26b and the lower band holder 26c in Fig. 18, and the grip 9b is turned in the predetermined second circumferential direction U2 to tighten the bolt 9a, the gap between the upper band support portion 24 and the lower band support portion 25 becomes narrower. This reduces the diameter of the band body 26a, allowing the band body 26a to tighten around the cylinder housing 1a and secure the band body 26a to the cylinder housing 1a.

[0072] 16 and 17, when the change lever 23 is slid to position the thick portion 23b of the change lever 23 between the upper band holder 26b and the lower band holder 26c of Fig. 18, and the grip 9b is turned in the predetermined second circumferential direction U2 to tighten the bolt 9a, the distance between the upper band support portion 24 and the lower band support portion 25 increases. In other words, the distance between the upper band holder 26b and the lower band holder 26c of the band main body 26a of Fig. 18 in the state shown in Figs. 16 and 17 is greater than the distance between the upper band holder 26b and the lower band holder 26c in the state shown in Figs. 14 and 15. 18 in the state shown in Figures 16 and 17 is larger than the lower limit value of the inner diameter D1 (see Figure 4) of the band body 26a in the state shown in Figures 14 and 15. This increases the diameter of the band body 26a, forming a gap between the band body 26a and the cylinder housing 1a, allowing the band body 26a to rotate relative to the cylinder housing 1a.

[0073] In the second embodiment, the handle 6 is also fixed by the fixing part 9, as shown in Fig. 18. Specifically, from the top, the upper support part 20b of the side handle 20, the upper handle cap 9c, the upper band support part 24, the upper band holder 26b of the band main body 26a, the change lever 23, the lower band holder 26c of the band main body 26a, the lower band support part 25, the lower handle cap 9e, and the lower support part 20c of the side handle 20 are arranged, and the bolt 9a is inserted through these parts.

[0074] Specifically, the bolt 9a is inserted through the upper support portion 20b of the side handle 20, the through-hole 20e of the fitting portion 20g provided on the underside of the upper support portion 20b, the through-hole 9h of the upper handle cap 9c, the through-hole 24c of the upper band support portion 24, the through-hole 26f of the upper band holder 26b, and the elongated hole 23a of the change lever 23. Furthermore, the bolt 9a is inserted through the through-hole 26g of the lower band holder 26c, the through-hole 25c of the lower band support portion 25, the through-hole 9i of the lower handle cap 9e, and the through-hole 20f of the fitting portion 20d provided on the top surface of the lower support portion 20c of the side handle 20. The tip of the bolt 9a is then screwed into the threaded hole 9g of the grip 9b. In other words, the upper handle cap 9c, upper band support part 24, upper band holder 26b of band main body 26a, change lever 23, lower band holder 26c of band main body 26a, lower band support part 25, and lower handle cap 9e are arranged between the upper support part 20b and the lower support part 20c of the side handle 20 through the bolt 9a.

[0075] Furthermore, because the screw hole 9g of the grip 9b is threadedly engaged with the bolt 9a, tightening the grip 9b narrows the gap between the upper band support part 24 and the lower band support part 25. This reduces the diameter of the band body 26a, allowing the band body 26a to tighten around the cylinder housing 1a and secure the band body 26a to the cylinder housing 1a.

[0076] On the other hand, turning the grip 9b to loosen the screw increases the distance between the upper band support part 24 and the lower band support part 25. This increases the diameter of the band body 26a, forming a gap between the band body 26a and the cylinder housing 1a, allowing the band body 26a to rotate relative to the cylinder housing 1a.

[0077] In the hammer drill 10 of the second embodiment, similarly to the hammer drill 10 of the first embodiment, the band 26 can be rotated in the first circumferential direction U1 relative to the cylinder housing 1a while the movement of the side handle 20 is fixed. Therefore, the band 26 can be freely rotated about the striking axis (first circumferential direction U1) during operation, improving the ease of use (handling) of the hammer drill 10. This improves the convenience of the handle 6 and the hammer drill 10.

[0078] In other words, the band 26 can be switched between rotating and fixed relative to the cylinder housing 1a according to the user's preference and the type of work being performed.

[0079] (Modification) A modification of the handle 6 of this embodiment will now be described.

[0080] The modified handle 6 shown in Figure 22 fixes the rotation of the handle holder 21 around the cylinder housing 1a shown in Figure 1, and allows the rotation of the side handle 20 around the bolt 9a to be switched between a fixed state and a rotating state.

[0081] The structure of the modified handle 6 will be explained using Figures 22 to 25. As shown in Figure 24, the modified handle 6 is fixed by a fixing part 9. Specifically, from the top, the following are arranged in order: the upper support part 20b of the side handle 20, the upper change spacer 13, the upper handle cap 9c, one end 21b of the upper hinge 21a of the handle holder 21, the change lever 22, the other end 21d of the lower hinge 21c of the handle holder 21, the lower handle cap 9e, the lower change spacer 14, and the lower support part 20c of the side handle 20. Then, a bolt 9a is inserted through these parts.

[0082] Specifically, the bolt 9a is inserted through the through-hole 20e of the upper support portion 20b of the side handle 20, the threaded hole of the fitting portion 20g provided on the underside of the upper support portion 20b, the through-hole 13b of the upper change spacer 13, the through-hole 9h of the upper handle cap 9c, the through-hole 21m of one end 21b of the upper hinge 21a, the through-hole 22b of the change lever 22 (see FIG. 10 ) and the through-hole 11a of the upper spacer 11. Furthermore, the bolt 9a is inserted through the through-hole 21n of the other end 21d of the lower hinge 21c, the through-hole 9i of the lower handle cap 9e, the through-hole 14b of the lower change spacer 14 and the through-hole 20f of the fitting portion 20d provided on the upper surface of the lower support portion 20c of the side handle 20. The tip of the bolt 9a is then fitted into the threaded hole 9g of the grip 9b via the through-hole 12a of the lower spacer 12. In other words, the upper change spacer 13, upper handle cap 9c, one end 21b of the upper hinge 21a of the handle holder 21, change lever 22, the other end 21d of the lower hinge 21c of the handle holder 21, lower handle cap 9e, and lower change spacer 14 are arranged between the upper support portion 20b and lower support portion 20c of the side handle 20 via bolt 9a. The upper spacer 11 is interposed within the upper support portion 20b of the side handle 20, and the lower spacer 12 is interposed within the lower support portion 20c. The upper surface of the upper change spacer 13 is formed with an uneven portion 13a, and the upper surface of the lower change spacer 14 is formed with an uneven portion 14a. Furthermore, the upper surface of the upper handle cap 9c is formed with an uneven portion 9j, and the lower surface of the lower handle cap 9e is formed with an uneven portion 9k.

[0083] Furthermore, fitting portion 20g provided on the underside of upper support portion 20b of side handle 20 and fitting portion 20d provided on the upper surface of lower support portion 20c are each threadedly connected to bolt 9a, so that when grip 9b is tightened, the gap between one end 21b of upper hinge 21a of handle holder 21 and the other end 21d of lower hinge 21c becomes narrower. This reduces the diameter of handle holder 21, allowing handle holder 21 to tighten around cylinder housing 1a and secure handle holder 21 to cylinder housing 1a.

[0084] On the other hand, when the grip 9b is loosened, the distance between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c becomes wider, which increases the diameter of the handle holder 21 and creates a gap between the handle holder 21 and the cylinder housing 1a, allowing the handle holder 21 to rotate relative to the cylinder housing 1a.

[0085] 22, when the change lever 22 is rotated to face a predetermined direction, the unevenness of the other end 21d of the lower hinge 21c engages with the unevenness of the change lever 22, narrowing the gap between one end 21b of the upper hinge 21a of the handle holder 21 and the other end 21d of the lower hinge 21c. In this state, because the gap between one end 21b of the upper hinge 21a and the other end 21d of the lower hinge 21c is narrow, the handle holder 21 tightens the cylinder housing 1a, and the rotation of the handle holder 21 around the cylinder housing 1a is fixed.

[0086] With the change lever 22 in this position, the grip 9b is tightened so that the convex portion of the lower handle cap 9e and the convex portion of the lower change spacer 14 butt up as shown in Figure 23, thereby increasing the axial length L1 of the lower handle cap 9e and the lower change spacer 14 as shown in Figure 26. As a result, the axial force F1 from the grip 9b is transmitted in this order to the lower spacer 12, the lower support part 20c, the lower change spacer 14, the lower handle cap 9e, and the other end 21d of the lower hinge 21c of the handle holder 21.

[0087] Therefore, the lower handle cap 9e is pressed against the other end 21d of the lower hinge 21c of the handle holder 21 by the axial force F1, preventing rotation and preventing the side handle 20 from rotating. An abutment rib 20h is provided inside the lower hinge 21c of the handle holder 21, and the lower hinge 21c abuts against the lower spacer 12 via the abutment rib 20h. Furthermore, the lower handle cap 9e is fitted into the fitting portion 20i (fitting portion 20d) of the lower hinge 21c.

[0088] On the other hand, by tightening the grip 9b so that the convex portion of the lower handle cap 9e fits into the concave portion of the lower change spacer 14 as shown in Figure 27, the axial length L1 of the lower handle cap 9e and the lower change spacer 14 as shown in Figure 28 is shortened. As a result, the axial force F2 from the grip 9b is transmitted to the other end 21d of the lower hinge 21c of the handle holder 21 only via the lower spacer 12. In this case, the axial force F2 is not transmitted to the upper handle cap 9c and the lower handle cap 9e, and the upper handle cap 9c and the lower handle cap 9e are not pressed against the one end 21b and the other end 21d of the handle holder 21. Therefore, gaps T1 are formed between the one end 21b and the upper handle cap 9c, and between the other end 21d and the lower handle cap 9e, respectively, so there is no anti-rotation function.

[0089] As described above, while the rotation of the handle holder 21 around the cylinder housing 1a is fixed, the rotation of the side handle 20 around the bolt 9a can be switched between a fixed state and a rotating state.

[0090] In the handle 6 of this modified example, for example, by fixing the rotation of the handle holder 21 around the cylinder housing 1a and switching the position of the side handle 20 around the bolt 9a to a rotating position, even if an impact is applied in the forward / backward direction P1 during work, the side handle 20 rotates, preventing vibration from being transmitted directly to the side handle 20. This improves the ease of use (handling) of the hammer drill 10 and the convenience of the handle 6 and the hammer drill 10.

[0091] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. In the above-described embodiment, the hammer drill 10 is taken as an example of a work machine, but the work machine may be, for example, an electric screwdriver, etc., as long as the handle 6 can be attached as a sub-handle.

[0092] 1...working machine body, 1a...cylinder housing (columnar portion), 1b...intermediate housing, 1c...motor housing, 2...main handle portion, 3...power cable, 4...outer circumferential surface, 5...trigger, 6...handle, 7...tipped tool holding portion, 8...tipped tool, 9...fixing portion, 9a...bolt, 9b...grip, 9c...upper handle cap, 9d...uneven portion, 9e...lower handle cap, 9f...uneven portion, 9g...screw hole, 9h, 9i...through hole, 9j, 9k...uneven portion, 10...hammer drill (working machine), 11...upper spacer, 11a... Through hole, 12...lower spacer, 12a...through hole, 13...upper change spacer, 13a...uneven portion, 13b...through hole, 14...lower change spacer, 14a...uneven portion, 14b...through hole, 18...impact mechanism portion, 19...motor, 20...side handle (grip portion), 20a...handle body, 20b...upper support portion, 20c...lower support portion, 20d...fitting portion, 20e...through hole, 20f...through hole, 20g...fitting portion, 20h...abutment rib, 20i...fitting portion, 21...handle holder (base portion), 21a...upper hinge (first member ), 21b...one end portion, 21c...lower hinge (second member), 21d...other end portion, 21e, 21f...connecting portion, 21g...pin, 21h, 21i...uneven portion, 21j...convex portion (predetermined location), 21k...concave portion, 21m, 21n...through hole, 22...change lever (limiting portion), 22a...annular portion, 22b...through hole, 22c...convex portion (first thick portion), 22d...concave portion (second thick portion), 23...change lever (limiting portion), 23a...long hole portion, 23b...thick portion (first thick portion), 23c...thin portion (second thick portion), 24...upper band support portion , 24a...uneven portion, 24b...wall portion, 24c...through hole, 25...lower band support portion, 25a...uneven portion, 25b...wall portion, 25c...through hole, 26...band (base portion), 26a...band main body, 26b...upper band holder, 26c...lower band holder, 26d, 26e...bent portion, 26f, 26g...through hole, C1...first axis, C2...second axis, D1...inner diameter, F1, F2...axial force, L1...axial length, P1...front-rear direction, Q1...up-down direction, R1...left-right direction, T1...gap, U1...first circumferential direction, U2...second circumferential direction

Claims

1. A handle attached to a work machine body, comprising: a base portion connected to a columnar portion extending along a first axis of the work machine body so as to be rotatable in a first circumferential direction about the first axis; a grip portion connected to the base so as to be rotatable in a second circumferential direction about a second axis intersecting the first axis; and a fixing portion capable of fixing the base to the columnar portion and fixing the grip portion to the base, wherein the fixing portion is capable of independently adjusting a first fixing force that fixes the base to the columnar portion and a second fixing force that fixes the grip portion to the base.

2. The handle according to claim 1, wherein the fixing portion is capable of simultaneously adjusting the first fixing force and the second fixing force through a single fixing action by an operator.

3. A handle as described in claim 2, wherein the fixing portion can select a plurality of fixing states including a first fixing state in which the base is fixed to the columnar portion and the grip portion is fixed to the base, and a second fixing state in which the first fixing force is smaller than the first fixing force in the first fixing state.

4. A handle as claimed in any one of claims 1 to 3, wherein the base portion is arc-shaped and extends in the first circumferential direction along the outer circumferential surface of the columnar portion, and the fixing portion tightens the columnar portion with the base by bringing one end and the other end of the base in the first circumferential direction closer to each other to reduce the inner diameter of the base, thereby increasing the first fixing force.

5. A handle as described in claim 4, wherein the fixing portion increases the second fixing force by pressing the grip portion against the base in the second axial direction when the one end and the other end of the base are brought closer to each other in the second axial direction.

6. A handle according to claim 4, wherein the fixing portion has a limiting portion that limits the first fixing force by restricting the amount of approach between the one end and the other end of the base portion.

7. A handle as described in claim 6, wherein the restricting portion has a first thick portion and a second thick portion thinner than the first thick portion, and is interposed between the one end and the other end of the base to restrict the amount of approach, and the amount of approach is adjusted depending on whether the first thick portion or the second thick portion engages with a predetermined position on the one end and the other end of the base.

8. The handle according to claim 7, wherein the limiting portion adjusts the amount of approach by rotating between the one end and the other end of the base portion.

9. A handle as described in claim 7, wherein the base comprises a first member having the one end and a second member having the other end, and a connecting portion that connects the first member and the second member so that they can move toward and away from each other.

10. A work machine having a work machine body and a handle attached to the work machine body, wherein the work machine body has: a motor; and a columnar portion extending in a first axial direction and having attached thereto a tool tip that is driven by the driving force of the motor; wherein the handle has: a base portion connected to the columnar portion so as to be rotatable in a first circumferential direction about the first axis; a grip portion connected to the base so as to be rotatable in a second circumferential direction about a second axis that intersects with the first axis; and a fixing portion capable of fixing the base to the columnar portion and fixing the grip portion to the base, wherein the fixing portion can individually release the fixation of the base to the columnar portion and the fixation of the grip portion to the base.

11. A work machine as described in claim 10, wherein the fixing portion is capable of simultaneously adjusting a first fixing force for fixing the base portion to the columnar portion and a second fixing force for fixing the gripping portion to the base portion by a single fixing action by an operator.

12. A work machine as described in claim 11, wherein the fixing portion can select a plurality of fixing states including a first fixing state in which the base is fixed to the columnar portion and the gripping portion is fixed to the base, and a second fixing state in which the first fixing force is smaller than the first fixing force in the first fixing state.

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