Mixer

Abstract

To inhibit deterioration of usability caused by vibration.SOLUTION: A stirrer 1 includes a body including a motor and a spindle which outputs rotation of the motor. The stirrer 1 includes: a stirring shaft connectable to the spindle; and a handle 20 attached to the body and including a left grip and a right grip 25. The stirrer 1 includes a vibration control part 40 disposed in an area ranging from the stirring shaft to the left grip and the right grip 25 (a space between a front arm 22 and the right grip 25).SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to an agitator for agitating fluid materials such as paint and mortar, and non-fluid materials such as sand and gravel. [Background technology]

[0002] The mixer has a spindle that protrudes from a main body that houses a motor, and an agitator shaft to which the rotation of the motor is transmitted can be connected to the spindle. A blade is attached to the agitator shaft, and the blade rotates together with the agitator shaft, allowing the paint or the like to be agitated. A handle is fixed to the main body, and the operator can support the main body by grasping grips provided on the left and right sides of the handle (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German Utility Model No. 202010014783 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional mixers, vibrations generated in the main body due to the rotation of the motor and vibrations generated on the mixing blade side are transmitted to the hands of the operator holding the grip portion, resulting in a poor user experience.

[0005] Therefore, an object of the present disclosure is to provide a mixer that can suppress deterioration in usability due to vibration. [Means for solving the problem]

[0006] To achieve the above object, the agitator of the present disclosure may include a main body provided with a motor and an output shaft that outputs rotation of the motor. The agitator of the present disclosure may include an agitator shaft connected to the output shaft, and a handle attached to the body and equipped with a grip. The agitator of the present disclosure may also include a vibration-damping section disposed between the agitating shaft and the grip. Furthermore, in the agitator of the present disclosure, the handle may have an attachment portion attached to the main body, an arm protruding from the attachment portion, and a grip attached to the arm, and the vibration-damping portion may be positioned between the arm and the grip. [Effects of the Invention]

[0007] According to the present disclosure, vibrations generated in the main body and the agitating blade are absorbed by the vibration-damping section, reducing the direct transmission of the vibrations to the operator's hands holding the grip. This reduces the deterioration of usability due to vibrations. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the entirety of a stirrer according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of the main body of the agitator of the first embodiment. [Figure 3] FIG. 2 is a plan view of the main body of the agitator of the first embodiment. [Figure 4] FIG. 2 is a side view of the main body of the agitator of the first embodiment. [Figure 5] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 2 is an exploded perspective view of the vibration-isolating part of the first embodiment. [Figure 7] FIG. 4 is an enlarged cross-sectional view taken along the line BB in FIG. 3. [Figure 8] FIG. 10 is a perspective view of the main body of the agitator of Example 2. [Figure 9] FIG. 10 is an exploded perspective view of the vibration-isolating part of the second embodiment. [Figure 10] FIG. 10 is an enlarged vertical cross-sectional view of the center of the vibration-isolating part of the second embodiment. [Figure 11] FIG. 10 is a perspective view of the agitator of Example 3. [Figure 12] FIG. 11 is an exploded perspective view of the vibration-isolating part of the third embodiment. [Figure 13] FIG. 11 is an enlarged vertical cross-sectional view of the center of the vibration-isolating part of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one embodiment of the present disclosure, the handle has an attachment portion attached to the main body, an arm protruding from the attachment portion, and a grip attached to the arm, and the vibration-damping portion may be positioned between the arm and the grip. This configuration effectively suppresses vibrations transmitted from the grip to the operator's hands. In one embodiment of the present disclosure, the vibration-isolating portion may be an elastic member interposed between the arm and the grip. According to this configuration, the vibration-isolating portion can be easily formed. In one embodiment of the present disclosure, the grip may be divided into two halves with an arm sandwiched between them, and the elastic member may be sandwiched between the two halves and cover the arm. This configuration provides a rational structure in which the elastic member is interposed at the same time as the two half sections are assembled. In one embodiment of the present disclosure, the two half portions are assembled by a screw member that passes through a through hole formed in the arm, and one of the half portions may be provided with a screw boss that passes through the through hole, and the elastic member may have a protrusion that is passed through the screw boss and fits into the through hole. According to this configuration, vibration can be reliably prevented by the screw fastening portions of the half-split portions.

[0010] In one embodiment of the present disclosure, the arm is a plate, and a slit is formed in the elastic member into which the arm is inserted, and the slit divides the elastic member into two segments in the thickness direction of the arm, and each segment may be provided with a protrusion. This configuration not only provides vibration isolation at the screw fastening portion, but also makes it easy to position the elastic member on the arm. In an embodiment of the present disclosure, a gap may be formed in the thickness direction between the protruding portions of each divided piece within the through hole. According to this configuration, the protrusions do not come into contact with each other and inhibit the elastic deformation of the divided pieces, and an appropriate vibration damping effect is obtained. In one embodiment of the present disclosure, the arms may be formed symmetrically about the main body, and a grip may be provided on each of the left and right arms. This configuration allows the main body to be supported in a well-balanced manner, and vibrations can be suppressed in each of the left and right grips. In one embodiment of the present disclosure, the arms may protrude outward to the left and right beyond the grip, and protective portions connected to the elastic members may be provided at the protruding ends thereof. According to this configuration, the end of the arm is protected, and the protective portion is assembled at the same time as the elastic member is assembled.

[0011] In one embodiment of the present disclosure, the vibration damping portion may be disposed between the body and the handle. This configuration effectively suppresses vibrations transmitted from the main body to the handle. In one embodiment of the present disclosure, the handle has an attachment portion attached to the main body, an arm attached to the attachment portion, and a grip attached to the arm, and the vibration-damping portion may be an elastic member interposed between the main body and the attachment portion. According to this configuration, the vibration-isolating portion can be easily formed. In one embodiment of the present disclosure, the mounting portion is assembled by a screw member that passes through a mounting hole formed in the mounting portion, and the elastic member may also be interposed between the mounting portion and the screw member. According to this configuration, it is possible to effectively damp vibration at the fixing portion using the screw member. In one embodiment of the present disclosure, the screw member may be fitted with a sleeve that passes through the mounting hole, and each elastic member may have a protrusion that fits into the mounting hole and surrounds the sleeve. According to this configuration, vibration can be reliably prevented at the mounting hole portion.

[0012] In one embodiment of the present disclosure, the vibration damping portion may be disposed between the output shaft and the stirring shaft. This configuration effectively suppresses vibrations transmitted from the stirring shaft to the main body. In one embodiment of the present disclosure, the stirring shaft is connected to the output shaft so as to be rotatable integrally with the output shaft and movable relative to the output shaft in the axial direction, and the vibration-damping part may be a coil spring that urges the stirring shaft in a direction away from the output shaft. This configuration makes it possible to effectively suppress axial vibration of the stirring shaft. In one embodiment of the present disclosure, a first sleeve may be integrally attached to the output shaft, and a second sleeve splined to the stirring shaft may be integrally attached, with a coil spring interposed between the first sleeve and the second sleeve. With this configuration, the coil spring can be disposed in a position that is effective for suppressing vibration. In one embodiment of the present disclosure, the first sleeve may be provided with a stopper member that engages with the second sleeve and restricts the protruding position of the stirring shaft in the separating direction. This configuration makes it possible to reliably restrict the range of movement of the stirring shaft relative to the output shaft. In one embodiment of the present disclosure, the grip may be a one-piece cylinder. This configuration provides a strong grip. [Example]

[0013] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire rechargeable agitator 1, which is an example of an agitator, FIG. 2 is a perspective view of the main body, FIG. 3 is a plan view, FIG. 4 is a side view, and FIG. 5 is a cross-sectional view taken along line AA in FIG. The agitator 1 comprises a main body 2 and an agitation shaft 3 . The main body 2 comprises a motor housing 4 and a speed reducer housing 5. The motor housing 4 houses a motor 6 on the rear side and a controller 8 on the front side. The motor 6 is supported with its rotating shaft 7 facing downward. The lower end of the rotating shaft 7 protrudes into the speed reducer housing 5. A battery mounting section 9 is provided at the top of the motor housing 4. A terminal block 10 is provided in the battery mounting section 9. A battery pack 11 can be slid onto the terminal block 10 from the front. A battery cover 12 is attached to the top of the motor housing 4. The battery cover 12 covers the battery pack 11 and the battery mounting section 9 from above.

[0014] A speed reducer 15 is housed within the speed reducer housing 5. The speed reducer 15 has a spindle 16 that protrudes downward from the lower end of the speed reducer housing 5. A threaded portion 17 is provided at the lower end of the spindle 16. The speed reducer 15 is made up of a plurality of gears and the like, and reduces the rotation of the rotary shaft 7 before transmitting it to the spindle 16. A switching lever 18 is provided on the right side surface of the speed reducer housing 5. The switching lever 18 can be rotated to switch the rotation speed of the spindle 16 between two levels: high and low. The stirring shaft 3 can be coaxially connected to a threaded portion 17 of a spindle 16. A blade 19 is attached to the lower end of the stirring shaft 3.

[0015] A handle 20 is attached to the main body 2. The handle 20 has an attachment portion 21, a pair of left and right front arms 22, 22, a pair of left and right rear arms 23, 23, a left grip 24, and a right grip 25. The mounting portion 21 is attached to the motor housing 4. The mounting portion 21 is U-shaped in plan view and is made of sheet metal with thinner upper and lower portions. A flange portion 26 that supports the mounting portion 21 from below is formed on the outer circumferential surface of the motor housing 4. The mounting portion 21 is set on the upper surface of the flange portion 26 and fastened to the flange portion 26 from above with a plurality of bolts 27, 27...

[0016] The front arms 22, 22 are formed integrally with the mounting portion 21 and extend outward to the left and right from the front end of the mounting portion 21. The rear arms 23, 23 are also formed integrally with the mounting portion 21 and extend outward to the left and right from the rear of the mounting portion 21. Rubber protective portions 28 are attached to the left and right outer ends of each of the front arms 22 and rear arms 23. Each protective portion 28 is thicker than each of the arms 22, 23. The left grip 24 and the right grip 25 are disposed in the front-rear direction, straddling the ends of the front arm 22 and the rear arm 23, on the left-right central side of the protective part 28. The left grip 24 and the right grip 25 have their front ends fixed to the end of the front arm 22 and their rear ends fixed to the end of the rear arm 23 by screws 29, 29, respectively. The left grip 24 and the right grip 25 are divided into an upper half 30 and a lower half 31, with the front and rear arms 22, 23 as the boundary. The upper half 30 and the lower half 31 are assembled from above with a plurality of screws 32, 32...

[0017] As shown in FIG. 6, a switch 33 is housed inside the right grip 25. A trigger 34 is provided on the switch 33 and protrudes from the underside of the right grip 25. A lock button 35 is provided on the left side of the right grip 25. The lock button 35 is provided to maintain the pressed state of the trigger 34. A lock lever 36 is provided on the front side of the switch 33. The lock lever 36 can be slid between a position that prevents the trigger 34 from being pressed and a position that allows it to be pressed. An adjustment dial 37 is provided in front of the lock lever 36. The adjustment dial 37 can be rotated to adjust the rotation speed of the motor 6. The adjustment dial 37 is exposed on the top surface of the right grip 25. A lead wire cover 38 is screwed to the right rear arm 23 and the upper surface of the mounting portion 21. Inside the lead wire cover 38, a lead wire connected to the switch 33 in the right grip 25 and a lead wire connected to the circuit board of the adjustment dial 37 are routed. Each lead wire is routed into the motor housing 4 from a wiring port (not shown) formed on the rear surface of the motor housing 4. The lead wire of the switch 33 is connected to the controller 8 and the terminal block 10, respectively. The lead wire of the adjustment dial 37 is routed to the controller 8.

[0018] Vibration-isolating sections 40 are provided between the front and rear arms 22, 23 and the front and rear ends of the left and right grips 24, 25. The structure of the vibration-isolating sections 40 will be described below. However, since the structure of each vibration-isolating section 40 is the same, the vibration-isolating section 40 between the right front arm 22 and the front end of the right grip 25 shown in Figure 6 will be described as a representative example. First, at the front end of the right grip 25, an insertion hole 41 is formed in the upper half 30 in the vertical direction. A screw 29 is inserted into the insertion hole 41 from above. A screw boss 42, into which the screw 29 is screwed, is formed facing upward in the lower half 31. A through hole 43, through which the screw boss 42 passes, is formed in the front arm 22. A cylindrical positioning portion 44 is formed facing upward in the lower half 31, rearward and outside of the screw boss 42. A notch 45, into which the positioning portion 44 engages, is formed in the rear edge of the front arm 22.

[0019] The vibration-proof part 40 is made of a rubber member 46 formed integrally with the protective part 28. The rubber member 46 is thinner than the protective part 28 and extends from the protective part 28 toward the center along the forearm 22. As shown in FIG. 7 , the protective part 28 and the rubber member 46 are formed with slits 47 into which the end of the forearm 22 is inserted. The slits 47 divide the rubber member 46 into a pair of segments 48, 48 located above and below the forearm 22. Two engaging protrusions 49, 49 are formed on the top surface of the upper segment 48 and the bottom surface of the lower segment 48 to engage with the insides of the upper half 30 and lower half 31. Circular portions 50, 50 that cover the through hole 43 from above and below are integrally formed at the ends of the divided pieces 48, 48. Each circular portion 50 has a larger diameter than the through hole 43. Protrusions 51, 51 that are circular in plan view are formed on the opposing surfaces of the circular portions 50, 50. Each protrusion 51 fits into the through hole 43 from above and below. A gap S is formed between the protrusions 51, 51 in the vertical direction within the through hole 43. A through hole 52, 52 through which the screw boss 42 passes from below is formed in the center of each circular portion 50.

[0020] Here, when assembling the right grip 25 to the forearm 22, first, the end of the forearm 22 is inserted into the slit 47 of the protective part 28 and the rubber member 46. Then, the protrusions 51, 51 of the upper and lower divided pieces 48, 48 fit into the through-hole 43 of the forearm 22 from above and below. Thus, the protective part 28 and the rubber member 46 are positioned. Next, the screw bosses 42 of the lower half 31 are inserted through the through holes 52 of each circular portion 50, and the positioning portions 44 are engaged with the notches 45. The screw bosses 42 then penetrate each circular portion 50 and protrude above the rubber member 46. In this state, the upper half 30 is placed over the right grip 25 from above, and the screws 29 inserted through the insertion holes 41 are threaded into the screw bosses 42. As shown in FIG. 7 , the upper half 30 and the lower half 31 are then attached to the forearm 22 with the rubber member 46 interposed between them, including the screw-fastening portions. At this time, the right grip 25, including the screw bosses 42 and screws 29, does not come into direct contact with the forearm 22.

[0021] In the mixer 1 configured as described above, the operator holds the left grip 24 and the right grip 25 provided on the handle 20. Therefore, the mixer 1 is supported in a position in which the mixing shaft 3 protrudes downward. When the operator presses the trigger 34 provided on the right grip 25 in this position, the switch 33 turns ON. This drives the motor 6, causing the rotating shaft 7 to rotate. The rotation of the rotating shaft 7 is reduced in speed by the reducer 15 in either the high-speed mode or the variable-speed mode selected by the switch lever 18, and is then transmitted to the spindle 16. Therefore, the mixing shaft 3 connected to the spindle 16 rotates, and the blade 19 rotating together with the mixing shaft 3 allows the mixing of paint or the like. During operation, the operator holding the left and right grips 24, 25 to support the mixer 1 can see the blade 19 at the lower end, the mixing shaft 3, the material to be mixed, and so on from above the motor housing 4 and battery cover 12. At this time, the mounting portion 21 of the handle 20 is not located in front of the motor housing 4 and battery cover 12, so the field of view is not obstructed by the mounting portion 21. Therefore, the operator can reliably see the blade 19 and so on.

[0022] During operation, vibrations are generated on the blade 19 side or by the driving of the motor 6. These vibrations are transmitted from the main body 2 to the front and rear arms 22, 23 of the handle 20. However, because the rubber members 46 of the vibration-damping part 40 are interposed between the front and rear arms 22, 23 and the left and right grips 24, 25, the vibrations are damped by the rubber members 46. In particular, vertical vibrations are absorbed by elastic deformation in the thickness direction of the circular portions 50, 50 of the segments 48, 48 located above and below the front and rear arms 22, 23. Vibrations in the front, rear, and left and right directions are absorbed by elastic deformation of the protrusions 51, 51 that fit into the through holes 43. Because a gap S is formed between the protrusions 51, 51 in the thickness direction, the protrusions 51 do not come into contact with each other and inhibit elastic deformation, providing an excellent vibration-damping effect. In this way, vibrations transmitted to the hands gripping the left and right grips 24, 25 are suppressed, making it less likely that the worker will feel uncomfortable.

[0023] The agitator 1 of Example 1 described above includes a main body 2 equipped with a motor 6 and a spindle 16 (output shaft) that outputs the rotation of the motor 6. The agitator 1 also includes a stirring shaft 3 connected to the spindle 16, and a handle 20 attached to the main body 2 and equipped with left and right grips 24, 25 (grips). The agitator 1 also includes a vibration-damping unit 40 arranged between the stirring shaft 3 and the left and right grips 24, 25 (here, between the front and rear arms 22, 23 and the left and right grips 24, 25). With this configuration, vibrations generated in the main body 2 due to the rotation of the motor 6 and vibrations generated on the stirring blade 19 side are absorbed by the vibration-isolating part 40. Therefore, these vibrations are less likely to be directly transmitted to the hands of the operator holding the left and right grips 24, 25, and deterioration of the usability due to vibrations can be suppressed.

[0024] In particular, the handle 20 has an attachment part 21 attached to the main body 2, front and rear arms 22, 23 (arms) protruding from the attachment part 21, and left and right grips 24, 25 (grips) attached to the front and rear arms 22, 23. The vibration-proof part 40 is disposed between the front and rear arms 22, 23 and the left and right grips 24, 25. Therefore, vibrations transmitted from the left and right grips 24, 25 to the hands of the operator can be effectively suppressed. The vibration-isolating portion 40 is a rubber member 46 (elastic member) interposed between the front and rear arms 22, 23 and the left and right grips 24, 25. Therefore, the vibration-isolating portion 40 can be easily formed.

[0025] The left and right grips 24, 25 are divided into two upper half portions 30 and a lower half portion 31 (half portions) sandwiching the front and rear arms 22, 23, and the rubber member 46 covers the front and rear arms 22, 23 and is sandwiched between the two upper half portions 30 and the lower half portion 31. Therefore, a rational configuration is achieved in which the rubber member 46 is interposed at the same time as the upper half 30 and the lower half 31 are assembled. The upper half 30 and the lower half 31 are assembled with screws 29 (screw members) that pass through through holes 43 formed in the front and rear arms 22, 23. The lower half 31 (one of the halves) is provided with a screw boss 42 that passes through the through hole 43, and the rubber member 46 has a protrusion 51 that is passed through the screw boss 42 and fits into the through hole 43. Therefore, vibration can be reliably prevented by the screw fastening portion between the upper half portion 30 and the lower half portion 31.

[0026] The front and rear arms 22, 23 are plates, and the rubber member 46 has slits 47 formed therein into which the front and rear arms 22, 23 are inserted. The slits 47 divide the rubber member 46 into two divided pieces 48, 48 in the thickness direction of the front and rear arms 22, 23, and each divided piece 48 has a protrusion 51. Therefore, vibration is prevented at the screw fastening portion, and the rubber member 46 can be easily positioned on the front and rear arms 22, 23. A gap S is formed between the protrusions 51 of each divided piece 48 in the through-hole 43 in the thickness direction. Therefore, the protrusions 51 do not come into contact with each other and inhibit the elastic deformation of the divided pieces 48, and an appropriate vibration damping effect is obtained.

[0027] The front and rear arms 22, 23 are formed symmetrically with respect to the main body 2, and the left and right grips 24, 25 are provided on the left and right front and rear arms 22, 23, respectively. Therefore, the main body 2 can be supported in a well-balanced manner, and vibrations can be suppressed in the left and right grips 24, 25, respectively. The front and rear arms 22, 23 protrude outward beyond the left and right grips 24, 25, and protective portions 28 connected to rubber members 46 are provided at the protruding ends thereof. This protects the ends of the front and rear arms 22, 23. Furthermore, the protective portion 28 is assembled at the same time as the rubber member 46 is assembled.

[0028] In Example 1, the shape of the vibration-damping part can be changed as appropriate. For example, the vibration-damping part is not limited to a structure in which two separate pieces are formed in the rubber member by a slit, but may be formed by arranging two separate rubber members above and below the arm. Conversely, the rubber member may have a screw boss passing through it with the upper and lower separate pieces connected within the through-hole. The rubber member may be formed separately from the protective portion. The screw boss may be located in the upper half instead of the lower half. The upper and lower halves of the front and rear arms may be screwed together at multiple locations. In this case, a vibration-damping section may be provided for each screw-fastened section, or the vibration-damping section may be formed across multiple screw-fastened sections. The handle has front and rear arms on the left and right, respectively, but may also have a configuration in which only front arms are provided on the left and right, and left and right grips are attached to each forearm. [Example]

[0029] Next, another embodiment of the present disclosure will be described. However, since the main configuration of the agitator is the same as that of the first embodiment, the same components are assigned the same reference numerals, and redundant explanations will be omitted. The description will focus on the vibration-isolating unit. In the mixer 1A shown in FIG. 8, vibration-isolating parts 40A are disposed between the main body 2 and the handle 20 at each fixing portion of the mounting part 21 fixed by the bolts 27. First, as shown in FIGS. 9 and 10 , the mounting portion 21 has a mounting hole 55 formed therein that is larger in diameter than the bolt 27. A sleeve 56 that passes through the mounting hole 55 is fitted to the bolt 27. The sleeve 56 has a smaller diameter than the mounting hole 55. A pair of rubber members 57, 57 that are circular in plan view are arranged above and below the mounting portion 21 to form the vibration-damping portion 40A. The rubber members 57, 57 have a larger diameter than the mounting hole 55, and protrusions 58, 58 that fit into the mounting hole 55 are formed on the opposing surfaces of the rubber members 57, 57. A gap S is formed between the opposing protrusions 58, 58 in the thickness direction. A through-hole 59 is formed in the center of each rubber member 57, through which the bolt 27 and sleeve 56 pass. The axial length of the sleeve 56 is approximately equal to the vertical thickness when the rubber members 57, 57 are arranged above and below the mounting portion 21. Washers 60, 60 through which the bolt 27 passes are arranged above and below the sleeve 56 and the upper and lower rubber members 57, 57, respectively.

[0030] To attach the handle 20 to the mixer 1A configured as described above, the sleeve 56 is placed in the mounting hole 55, and rubber members 57 are placed above and below the mounting hole 55. Then, with washers 60 placed above and below the rubber members 57, the mounting portion 21 is set on the flange portion 26. In this state, the bolt 27 is inserted from above through the washer 60 and sleeve 56 and into the screw hole 61 in the flange portion 26. A nut 62 is held below the screw hole 61. Therefore, when the bolt 27 is tightened onto the nut 62, the washers 60 and sleeve 56 are fixed to the flange portion 26 by the bolt 27. In this state, the mounting portion 21 is sandwiched between the upper and lower rubber members 57 and is not in contact with the sleeve 56 or the washers 60.

[0031] Therefore, even if vibrations generated during work are transmitted to the motor housing 4, the vibrations are damped by the rubber members 57, 57 because the vibration-isolating part 40A is interposed between the motor housing 4 and the mounting part 21. In particular, vertical vibrations are absorbed by the elastic deformation of the rubber members 57, 57 located above and below the mounting part 21. Vibrations in the front-rear and left-right directions are absorbed by the elastic deformation of the protrusions 58, 58 that fit into the mounting holes 55. In this way, vibrations transmitted to the hands gripping the left and right grips 24, 25 are suppressed, making it less likely that the worker will feel uncomfortable.

[0032] The agitator 1A of Example 2 described above includes a main body 2 equipped with a motor 6 and a spindle 16 that outputs the rotation of the motor 6. The agitator 1A also includes a stirring shaft 3 connected to the spindle 16, and a handle 20 attached to the main body 2 and equipped with left and right grips 24, 25. The agitator 1A also includes a vibration-damping unit 40A arranged between the stirring shaft 3 and the left and right grips 24, 25 (here, between the main body 2 and the handle 20). With this configuration, vibrations generated in the main body 2 due to the rotation of the motor 6 and vibrations generated on the stirring blade 19 side are absorbed by the vibration-isolating part 40A, and are less likely to be transmitted directly to the hands of the operator holding the left and right grips 24, 25. This makes it possible to prevent deterioration of the usability due to vibrations.

[0033] In particular, the vibration-isolating part 40A is disposed between the main body 2 and the handle 20. Therefore, vibrations transmitted from the main body 2 to the handle 20 can be effectively suppressed. The handle 20 has an attachment part 21 attached to the main body 2, front and rear arms 22, 23 attached to the attachment part 21, and left and right grips 24, 25 attached to the front and rear arms 22, 23. The vibration-proof part 40A is a rubber member 57 interposed between the main body 2 and the attachment part 21. Therefore, the vibration-isolating portion 40A can be easily formed. The mounting portion 21 is assembled by a bolt 27 (screw member) that passes through a mounting hole 55 formed in the mounting portion 21 , and the rubber member 57 is also interposed between the mounting portion 21 and the bolt 27 . Therefore, it is possible to effectively damp vibration at the fixing portion by the bolt 27. The bolt 27 is fitted with a sleeve 56 that passes through the mounting hole 55 , and each rubber member 57 has a protrusion 58 that fits into the mounting hole 55 and surrounds the sleeve 56 . Therefore, vibration can be reliably prevented at the mounting hole 55 portion.

[0034] In the second embodiment, the number of bolts is not limited to the above example, and can be increased or decreased as appropriate. The rubber member is divided into upper and lower parts for the mounting portion, but the upper and lower connected rubber members may be fitted into the mounting hole and the bolt and sleeve may be passed through. The rubber member may be connected to adjacent bolts to form an integral unit. The shape of the attachment portion is not limited to the above example, and the attachment portion may be a ring-shaped portion that goes around the main body. The flange portion for fixing the mounting portion is not limited to a shape that is continuous in the circumferential direction of the main body, but may be formed so as to protrude intermittently from the main body at each fixing position with a bolt. [Example]

[0035] In the agitator 1B shown in FIG. 11, the vibration-damping part 40B is provided between the spindle 16 and the agitator shaft 3, as shown in FIGS. 12 and 13. An upper sleeve 65 is threadedly connected to the threaded part 17 of the spindle 16. The upper sleeve 65 has a flange 66 at its upper end. An internal spline part 67 with a plurality of spline teeth extending in the axial direction is formed on the outer periphery of the lower part of the upper sleeve 65. An outer sleeve 68 is fitted on the exterior of the upper sleeve 65. The upper end of the outer sleeve 68 is fixed to the flange 66 of the upper sleeve 65. A ring-shaped outer stopper 69 that protrudes radially inward is formed on the inner periphery of the lower end of the outer sleeve 68.

[0036] A lower sleeve 70 is fitted to the upper sleeve 65. The lower sleeve 70 has a smaller diameter than the inner diameter of the outer sleeve 68, and an outer spline portion 71 with a plurality of spline teeth extending in the axial direction is formed on its inner periphery. The outer spline portion 71 meshes with the inner spline portion 67 of the upper sleeve 65. Therefore, the lower sleeve 70 can rotate integrally with the upper sleeve 65 and can move relative to the upper sleeve 65 in the vertical direction. The upper part of the lower sleeve 70 is located between the upper sleeve 65 and the outer sleeve 68. A ring-shaped inner stopper 72 that protrudes radially outward is formed on the outer periphery of the upper end of the lower sleeve 70. The inner stopper 72 can be engaged with the outer stopper 69 of the outer sleeve 68 from above. A coil spring 73 is fitted to the upper sleeve 65 between the flange 66 and the lower sleeve 70 to form the vibration-isolating portion 40B. Therefore, the lower sleeve 70 is biased by the coil spring 73 to a lower limit position where the inner stopper 72 engages with the outer stopper 69 from above. A connector 74 is fixed to the lower end of the lower sleeve 70. The upper end of the stirring shaft 3 is inserted and fixed into the center of the connector 74. The connector 74 is prevented from rotating by a lock nut 75.

[0037] In this mixer 1B, when the spindle 16 rotates, the outer sleeve 68 and the lower sleeve 70, which are integral with the upper sleeve 65 in the rotational direction, rotate together. When the lower sleeve 70 rotates, the mixing shaft 3 rotates together via the connecting member 74. When the stirring shaft 3 moves up and down due to vibrations generated on the blade 19 side during operation, the lower sleeve 70 integrated with the stirring shaft 3 moves up and down along the outer periphery of the upper sleeve 65, causing the coil spring 73 to expand and contract in the axial direction. Thus, the vibrations are damped by the coil spring 73. In this way, vibrations transmitted to the hands gripping the left and right grips 24, 25 are suppressed, making it less likely that the worker will feel uncomfortable.

[0038] The agitator 1B of Example 3 described above includes a main body 2 equipped with a motor 6 and a spindle 16 that outputs the rotation of the motor 6. The agitator 1B also includes an agitator shaft 3 connected to the spindle 16, and a handle 20 attached to the main body 2 and equipped with left and right grips 24, 25. The agitator 1B also includes a vibration-damping unit 40B arranged between the agitator shaft 3 and the left and right grips 24, 25 (here, between the spindle 16 and the agitator shaft 3). With this configuration, vibrations generated on the stirring blade 19 side are absorbed by the vibration-isolating portion 40B, and are less likely to be directly transmitted to the hands of the operator holding the left and right grips 24, 25. This makes it possible to prevent deterioration in usability due to vibrations.

[0039] In particular, the vibration isolating part 40B is disposed between the spindle 16 and the stirring shaft 3. Therefore, vibrations transmitted from the stirring shaft 3 to the main body 2 can be effectively suppressed. The stirring shaft 3 is connected to the spindle 16 so as to be rotatable integrally with the spindle 16 and so as to be movable relative to the spindle 16 in the axial direction, and the vibration-proof part 40B is a coil spring 73 that biases the stirring shaft 3 in a direction away from the spindle 16. Therefore, vibrations in the axial direction of the stirring shaft 3 can be effectively suppressed. An upper sleeve 65 (first sleeve) is attached integrally to the spindle 16, and a lower sleeve 70 (second sleeve) spline-connected to the upper sleeve 65 is attached integrally to the stirring shaft 3. A coil spring 73 is interposed between the upper sleeve 65 and the lower sleeve 70. Therefore, the coil spring 73 can be disposed at a position that is effective for suppressing vibration. The upper sleeve 65 is provided with an outer sleeve 68 (stopper member) that engages with the lower sleeve 70 to restrict the protruding position of the stirring shaft 3 in the separating direction. Therefore, the range of movement of the stirring shaft 3 relative to the spindle 16 can be reliably restricted.

[0040] In the third embodiment, a plurality of coil springs may be provided. For example, two coil springs, one large and one small, with different diameters may be used. The vibration-isolating portion is not limited to a coil spring, and may also be a disc spring, a rubber member, or the like. In the above example, the lower sleeve is mounted on the exterior of the upper sleeve and spline-coupled, but the upper sleeve may also be mounted on the exterior of the lower sleeve and spline-coupled. The outer sleeve may be provided on the lower sleeve.

[0041] In addition, as is common to all the embodiments, the grip is not limited to a structure consisting of upper and lower halves. The grip may have a structure consisting of left and right halves, or a divided structure consisting of three or more parts. The grip may also be an integral cylindrical type that is not divided. In this case, a strong grip can be obtained. The shape of the main body, the arrangement of the internal motor, the arrangement of the controller, etc. can be changed as appropriate. The location of the battery attachment section is not limited to the top of the motor housing, and it can also be provided on the side or rear of the motor housing. The power source is not limited to a battery, and the present disclosure is also applicable to a configuration in which power is supplied to the motor via a power cord from a commercial power source (AC). The length of the stirring shaft, the attachment structure to the spindle, and the shape of the blade are not limited to the above-mentioned forms. The vibration-isolating units of each embodiment are not limited to being provided in a single agitator. For example, all of the vibration-isolating units of Examples 1 to 3 may be provided in one agitator, or any two of the vibration-isolating units of Examples 1 to 3 may be applied to one agitator. [Explanation of symbols]

[0042] 1··Agitator, 2··Main body, 3··Agitation shaft, 4··Motor housing, 5··Reduction unit housing, 6··Motor, 7··Rotating shaft, 8··Controller, 15··Reduction unit, 16··Spindle, 19··Blade, 20··Handle, 21··Mounting unit, 22··Front arm, 23··Rear arm, 24··Left grip, 25··Right grip, 26··Flange portion, 28··Rubber, 29, 32··Screw, 30··Upper half portion, 31·· Lower half split portion, 40...anti-vibration portion, 41...insertion hole, 42...screw boss, 46...rubber member, 47...slit, 48...split piece, 49...engaging protrusion, 50...circular portion, 51, 58...convex portion, 55...mounting hole, 56...sleeve, 57...rubber member, 60...washer, 65...upper sleeve, 66...flange, 68...outer sleeve, 69...outer stopper, 70...lower sleeve, 72...inner stopper, 73...coil spring, S...gap.

Claims

1. a main body including a motor and an output shaft that outputs the rotation of the motor; a stirring shaft connected to the output shaft; a handle attached to the body and having a grip; a vibration-isolating part disposed between the stirring shaft and the grip; comprising The handle has an attachment portion attached to the main body, an arm protruding from the attachment portion, and the grip attached to the arm, and the vibration-damping portion is positioned between the arm and the grip.

2. 2. The mixer according to claim 1, wherein the vibration-isolating portion is an elastic member interposed between the arm and the grip.

3. 3. The mixer according to claim 2, wherein the grip is divided into two halves with the arm sandwiched therebetween, and the elastic member is sandwiched between the two halves and covers the arm.

4. The two half portions are assembled by a screw member that passes through a through hole formed in the arm, and one of the half portions is provided with a screw boss that passes through the through hole, and the elastic member has a convex portion that is passed through the screw boss and fits into the through hole.

5. 5. The agitator according to claim 4, wherein the arm is a plate, the elastic member has a slit formed therein through which the arm is inserted, the slit divides the elastic member into two segments in the thickness direction of the arm, and each segment has a protrusion.

6. The agitator according to claim 5 , wherein a gap is formed in the thickness direction between the protrusions of each of the divided pieces within the through-hole.

7. 7. The mixer according to claim 2, wherein the arms are formed symmetrically about the body, and the grips are provided on the left and right arms, respectively.

8. The agitator according to claim 7, wherein the arms protrude outward beyond the grips to the left and right, and the protruding ends of the arms are provided with protective portions connected to the elastic members.

9. 3. The mixer according to claim 1, wherein the grip is an integral cylindrical shape.

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