Electric hammer

Abstract

To enable dust collection without using a dust collector at the outside.SOLUTION: An electric hammer 1 includes: a body 2 incorporating a motor 6; and a striking mechanism part 3 which is disposed below the body 2 and whose striking axis L extends in a vertical direction. The striking mechanism part 3 may be operated by driving the motor 6 to strike a bit B attached to the lower side of the striking mechanism part 3. The electric hammer 1 includes: a dust collection fan 45 which rotates in conjunction with the motor 6 being driven; a dust collection channel R connected to a suction port 78 which is open to the tip side of the bit B, the dust collection channel R configured to generate a suction force in the suction port 78 in conjunction with the dust collection fan 45 rotating; and a dust box 60 provided on the dust collection channel R to collect dust suctioned through the suction port 78.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an electric hammer. [Background technology]

[0002] In an electric hammer, a dust collection attachment such as that disclosed in Patent Document 1 is used to collect dust generated during crushing work using a bit. This dust collection attachment is penetrated by the bit and opens downward, and a hose connected to an external dust collector is held by a hose holder attached to the housing of the electric hammer, and the lower end of the hose is connected to the dust collection attachment. With this dust collection attachment, a suction force is generated at the opening when the dust collector is operated, and the generated dust can be sucked in and collected in the dust collector via the hose. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6379004 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional electric hammer, when using a dust collection attachment, it is necessary to prepare and connect a separate dust collector, which is time-consuming and labor-intensive.

[0005] Therefore, an object of the present disclosure is to provide an electric hammer that is capable of collecting dust without using an external dust collector. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides an electric hammer including a main body having a built-in motor and an impact mechanism, the impact mechanism being actuated by driving the motor to impact a bit attached to an impact axis of the impact mechanism, A dust collection fan that rotates as the motor is driven; a dust collection flow path having a suction port that opens toward the tip side of the bit and generates a suction force at the suction port as the dust collection fan rotates; and a dust collecting section provided on the dust collection flow path for collecting the dust sucked in through the suction port. Effect of the Invention

[0007] According to the present disclosure, dust can be collected in the dust collecting section without using an external dust collector, thereby improving workability. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a central vertical cross-sectional view of the electric hammer. [Diagram 2] FIG. 4 is an enlarged view of the main body with the dust box removed. [Diagram 3] 13 is an enlarged view of the main body with the connection port closed with a cap. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In one embodiment of the present disclosure, a portion of the dust collection passage leading to the dust collection section may be provided within the main body section. According to this configuration, the portion of the dust collection passage exposed to the outside of the electric hammer is reduced, and the provision of the dust collection passage does not interfere with work. In one embodiment of the present disclosure, the motor may be located on the striking axis. This configuration reduces deviation of the center of gravity from the impact axis, and maintains overall balance. In one embodiment of the present disclosure, the dust collecting unit may be disposed on the opposite side of the striking mechanism unit across the motor on the striking axis. With this configuration, even if the dust collecting section is provided, the deviation of the center of gravity from the striking axis is suppressed, and the overall balance can be maintained. In one embodiment of the present disclosure, the dust collecting unit may have a filter with the filter surface facing downward, and air may pass through the filter from bottom to top inside the dust collecting unit. According to this configuration, the dust captured on the filter surface is less likely to adhere to the filter surface, and the progress of clogging of the filter can be slowed down. In one embodiment of the present disclosure, a dust collection fan and a cooling fan for cooling the motor may be provided separately on either side of the axial direction of the rotation shaft of the motor. This configuration makes it easier to form a dust collection passage and a passage for air that cools the motor.

[0010] In one embodiment of the present disclosure, another portion of the dust collection flow path is formed by an external hose extending from the suction port to the main body portion, and the main body portion may be provided with a connection port for connecting to a portion of the dust collection flow path provided within the main body portion. With this configuration, it is easy to connect a part of the dust collection passage provided in the main body to an external hose. In one embodiment of the present disclosure, the striking axis extends in the vertical direction, the bit is attached to the lower side of the striking mechanism, and the connection port may open downward. According to this configuration, the external hose connected to the connection port can be routed vertically along the impact mechanism, making it less likely that the external hose will get in the way of work. In one embodiment of the present disclosure, the dust collection unit may be detachable from the main body unit. This configuration makes it easier to dispose of collected dust and to perform maintenance such as replacing and cleaning the filter. In one embodiment of the present disclosure, the device has a detection means for detecting the attachment state of the dust collection unit to the main body, and a controller for controlling the driving of the motor, and the controller may not drive the motor if the attachment state of the dust collection unit is not detected by the detection means. According to this configuration, work without the dust collecting unit attached is restricted, and dust collection by the dust collecting unit can be performed reliably. EXAMPLES

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a central vertical cross-sectional view showing an example of an electric hammer, and FIG. 2 is an enlarged view of a main body with a dust box removed. The electric hammer 1 has a main body 2 on the upper side and a striking mechanism 3 on the lower side. The main body 2 has a box-shaped upper housing 4. The striking mechanism 3 has a lower housing 5 connected to the upper housing 4. A motor 6 and a motion conversion mechanism 7 are provided inside the upper housing 4. The lower housing 5 is cylindrical and holds the striking mechanism 3, and the striking axis L1 of the striking mechanism 3 extends in the vertical direction. A pair of handles 8A, 8B protruding outward to the left and right are provided on the left and right side surfaces of the upper housing 4. A switch 9 is built into the right handle 8B, and a switch lever 10 that turns on the switch 9 when pushed is provided facing upward on the upper side of the handle 8B.

[0012] The motor 6 is provided at the top of the upper housing 4. The motor 6 includes a stator 11 and a rotor 12. The motor 6 is arranged such that the axis L2 of a rotating shaft 13 provided on the rotor 12 extends in the left-right direction perpendicular to the impact axis L1. The rotating shaft 13 is supported by left and right bearings 15A, 15B in a motor housing 14 formed by partitioning the upper housing 4. A pinion 16 is provided on the left end of the rotating shaft 13 protruding from the left bearing 15A.

[0013] The motion conversion mechanism 7 includes an intermediate shaft 20, a crankshaft 21, a connecting rod 22, and a piston 23. The intermediate shaft 20 is supported in parallel to the rotating shaft 13 below the left side of the motor 6 within a gear housing 24 that is connected to the lower side of the motor housing 14. A first gear 25 is provided on the intermediate shaft 20. The first gear 25 meshes with the pinion 16 of the rotating shaft 13. A second gear 26 is provided on the intermediate shaft 20 to the right of the first gear 25. The crankshaft 21 is supported parallel to the intermediate shaft 20 in a gear housing 24 below the intermediate shaft 20. The crankshaft 21 has a third gear 27 that meshes with the second gear 26. The crankshaft 21 has an eccentric pin 28 at an eccentric position on the right end face. The connecting rod 22 has an upper end connected to the eccentric pin 28 and a lower end connected to the piston 23. The piston 23 is accommodated in a cylinder 29 that is supported in the vertical direction within the lower housing 5 so as to be vertically movable.

[0014] A second crankshaft 30 is coaxially supported on the right side of the crankshaft 21. The second crankshaft 30 is engaged with the eccentric pin 28 and is rotatable with the eccentric motion of the eccentric pin 28. The second crankshaft 30 has a second eccentric pin 31 at a position that is in the opposite phase to the eccentric pin 28 of the crankshaft 21. The upper end of a second connecting rod 32 disposed on the right side of the cylinder 29 is connected to the second eccentric pin 31. A counterweight 33 is attached to the exterior of the cylinder 29 so as to be movable up and down. The lower end of the second connecting rod 32 is connected to the counterweight 33.

[0015] A cylindrical tool holder 35 is coaxially connected to the lower side of the lower housing 5. A bit B can be inserted into the tool holder 35 from below. A tool retainer 36 is provided at the bottom of the tool holder 35. The tool retainer 36 engages with the bit B inserted into the tool holder 35 to prevent the bit B from falling out. The striking mechanism 3 includes a striker 37 and an impact bolt 38. The striker 37 is housed in the lower part of the cylinder 29 via an air chamber 39 below the piston 23 so as to be vertically movable. The impact bolt 38 is housed in the tool holder 35 below the striker 37 so as to be vertically movable, and the upper end of the impact bolt 38 protrudes into the cylinder 29 at the upper limit position where the bit B is pushed in. Here, the cylinder 29, the piston 23, the striker 37, the tool holder 35, and the impact bolt 38 are coaxially arranged on the impact axis L1.

[0016] In the upper housing 4, a cooling fan 40 for the motor 6 is provided to the right of the bearing 15A of the rotating shaft 13. A baffle portion 41 that covers the outer periphery of the cooling fan 40 from the right side is provided inside the motor housing 14. A plurality of ventilation holes 42, 42... are formed around the bearing 15A on the left end surface of the motor housing 14. A plurality of intake ports 43, 43... that open into the motor housing 14 are formed on the rear surface of the upper housing 4. A plurality of first exhaust ports 44, 44... are formed on the left surface of the upper housing 4 below the motor housing 14. A dust collecting fan 45 is provided at the right end of the rotating shaft 13 protruding from the motor housing 14. A fan cover 46 is provided on the right side surface of the motor housing 14 to cover the dust collecting fan 45 from the right side. A cylindrical air inlet 47 is provided facing upward at the top of the fan cover 46. A plurality of air outlets 48, 48 are provided at the bottom of the fan cover 46, radially outside the dust collecting fan 45. A plurality of second exhaust ports 49, 49... are formed on the right side surface of the upper housing 4 below the handle 8B. A controller 50 is housed vertically in the upper housing 4 on the right side of the gear housing 24. The controller 50 is disposed between the air outlet 48 and the second exhaust port 49. A power cord 51 is connected to the lower right part of the upper housing 4 below the controller 50. The controller 50 operates by obtaining power from the power cord 51, and controls the drive of the motor 6 according to the ON / OFF state of the switch 9.

[0017] A holding recess 55 for a dust box 60 (described later) is recessed into the top surface of the upper housing 4. The holding recess 55 is a bottomed recess whose top surface opens into a rectangular shape in a plan view, with a left cylinder portion 56 formed facing downward and to the left on the left side of the bottom surface, and a right cylinder portion 57 formed facing downward on the right side of the bottom surface. The upper end of an internal hose 58 is connected to the left cylinder portion 56. The air inlet 47 of the fan cover 46 is inserted into the right cylinder portion 57 from below. The internal hose 58 is housed in the vertical direction on the left side inside the upper housing 4, bypassing the rear of the gear housing 24. A cylindrical connection port 59 is provided on the left underside of the upper housing 4. The lower end of the internal hose 58 is connected to the connection port 59. A lower portion of the connection port 59 protrudes downward from the underside of the upper housing 4. The internal hose 58 is an example of a part of the dust collection flow path of the present disclosure. The dust box 60 has a square box shape in plan view that matches the inner shape of the holding recess 55. Engagement grooves 61, 61 are formed in the front-rear direction on the left and right inner surfaces of the holding recess 55. Protrusions 62, 62 that engage with the engagement grooves 61, 61 are formed in the front-rear direction on the left and right outer surfaces of the dust box 60.

[0018] Therefore, when the dust box 60 is fitted into the holding recess 55 from above, the protrusions 62, 62 engage with the engagement grooves 61, 61 to be held within the holding recess 55. When the dust box 60 is pulled upward using a finger hook (not shown) provided on the top surface, the protrusions 62, 62 disengage from the engagement grooves 61, 61, and the dust box 60 can be removed. A detection switch 63 is provided on the lower right side of the holding recess 55. The detection switch 63 has a plunger 64 protruding upward from the bottom surface of the holding recess 55. When the dust box 60 is attached to the holding recess 55, the plunger 64 is pushed in and the detection switch 63 turns ON. The ON signal is input to the controller 50. The detection switch 63 is an example of a detection means of the present disclosure.

[0019] The dust box 60 is divided into a lower dust collection chamber 66 and an upper ventilation chamber 67 by a partition plate 65 provided inside. An inlet 68 is formed on the left side of the lower surface of the dust collection chamber 66, which communicates with the left cylinder portion 56 when the dust box 60 is attached to the holding recess 55. A filter holding portion 69 is provided on the lower side of the partition plate 65, and a filter 70 is held in the filter holding portion 69. The filter 70 is made of paper folded in the left-right or front-back direction, and is held horizontally with the filter surface 71 facing down. A communication port 72 is formed in the partition plate 65 above the filter 70, which communicates with the ventilation chamber 67. The ventilation chamber 67 wraps around to the right side of the dust collection chamber 66 and reaches the bottom surface of the dust box 60. An outlet 73 is formed at the lower end of the ventilation chamber 67, which communicates with the air inlet 47 of the fan cover 46 when the dust box 60 is attached to the holding recess 55. The dust box 60 is an example of a dust collection section of the present disclosure.

[0020] The upper end of a flexible hose 75 is inserted and connected to the connection port 59 protruding from the upper housing 4. The flexible hose 75 is held in the up-down direction along the lower housing 4 by a hose holder 76 attached to the exterior of the lower part of the lower housing 5. A dust collection attachment 77 is connected to the lower end of the flexible hose 75. The dust collection attachment 77 is cup-shaped with a lower end that opens as a suction port 78, through which a bit B can pass. A cylindrical hose connection part 79 is provided on the left side of the upper surface of the dust collection attachment 77 and protrudes upward. This dust collection attachment 77 is attached by passing the bit B attached to the tool holder 35 from above and screwing the lower end of a flexible hose 75 into a hose connection portion 79. The flexible hose 75 is an example of an external hose that is another part of the dust collection passage of the present disclosure. In this way, a dust collection flow path R, indicated by a dotted arrow in Fig. 1, is formed in the electric hammer 1. In the dust collection flow path R, air sucked in through the suction port 78 of the dust collection attachment 77 passes through the flexible hose 75 and the internal hose 58 and enters the dust box 60 from the inlet 68. In the dust box 60, the air passes through the dust collection chamber 66, the filter 70, and the ventilation chamber 67, in that order, before reaching the fan cover 46 from the outlet 73. The air then passes through the air outlet 48, inside the upper housing 4, and is discharged from the second exhaust port 49.

[0021] When performing work such as breaking down concrete with the electric hammer 1 configured as described above, the switch lever 10 is pushed in to turn on the switch 9 while the suction port 78 at the lower end of the dust collection attachment 77 is in contact with or close to the work surface. Then, the controller 50 checks whether an ON signal has been obtained from the detection switch 63, i.e., whether the dust box 60 is attached to the holding recess 55. If the ON signal from the detection switch 63 is not confirmed, the controller 50 does not drive the motor 6. On the other hand, when an ON signal from the detection switch 63 is confirmed, the controller 50 drives the motor 6 to rotate the rotary shaft 13 together with the rotor 12. The rotation of the rotary shaft 13 is reduced in speed by the pinion 16, the first gear 25, the second gear 26, and the third gear 27, and is transmitted to the crankshaft 21, causing the eccentric pin 28 to perform eccentric motion. As a result, the piston 23 moves up and down via the connecting rod 22, and the striker 37 is moved in eccentric motion by the action of the air spring in the air chamber 39. Then, the striker 37 moving up and down strikes the bit B via the impact bolt 38. At this time, the second crankshaft 30 engaged with the eccentric pin 28 rotates at the same time, causing the second eccentric pin 31 to perform eccentric motion. This causes the counterweight 33 to move up and down along the cylinder 29 via the second connecting rod 32 in the opposite direction to the up and down movement of the piston 23. This makes it possible to suppress vibrations during impact.

[0022] As the rotating shaft 13 rotates, the cooling fan 40 and the dust collection fan 45 rotate. As the cooling fan 40 rotates, outside air is drawn in through the air intake 43 of the upper housing 4 and passes through the motor 6, thereby cooling the motor 6. The air that has passed through the motor 6 exits the upper housing 4 through the air vent 42 of the motor housing 14, flows down, and is exhausted to the outside through the first exhaust port 44. The rotation of the dust collection fan 45 creates a negative pressure inside the fan cover 46, and a suction force is generated at the suction port 78 of the dust collection attachment 77. Then, the air sucked into the dust collection attachment 77 from the suction port 78 passes through the dust collection flow path R and is discharged to the outside of the upper housing 4 from the second exhaust port 49 as described above. Therefore, the dust sucked in together with the air is captured by the filter surface 71 of the filter 70 when passing through the dust box 60 and stored in the dust collection chamber 66. At this time, the air passes through the filter 70 from bottom to top, so that the dust captured on the filter surface 71 is likely to fall into the dust collection chamber 66. In particular, the vibration caused by the impact is also added, so that the fall of the dust is promoted and the filter surface 71 is less likely to become clogged.

[0023] In the dust collection passage R, the controller 50 is located on the passage of air flowing from the air outlet 48 of the fan cover 46 to the second exhaust port 49 of the upper housing 4. Therefore, the air flow comes into contact with the controller 50, and the controller 50 can be cooled. When disposing of the dust in the dust box 60, if the dust box 60 is removed from the holding recess 55 as shown in FIG. 2, the dust in the dust collecting chamber 66 can be disposed of through the entrance 68. When performing work that does not require dust collection without attaching the dust collection attachment 77 and flexible hose 75, the lower end of the connection port 59 can be closed with a cap 80 as shown in Fig. 3. By closing the connection port 59 in this way, foreign matter will not be sucked in through the connection port 59 even when the dust collection fan 45 is rotating.

[0024] Thus, the electric hammer 1 of the above embodiment includes a main body 2 incorporating a motor 6, and an impact mechanism 3, and the impact mechanism 3 is operated by driving the motor 6 to strike a bit B attached to the impact axis L1 of the impact mechanism 3. The electric hammer 1 is equipped with a dust collection fan 45 that rotates as the motor 6 is driven, a dust collection flow path R that has a suction port 78 that opens toward the tip side of the bit B and generates a suction force at the suction port 78 as the dust collection fan 45 rotates, and a dust box 60 that is provided on the dust collection flow path R and collects dust sucked in from the suction port 78. According to this configuration, dust can be collected in the dust box 60 without using an external dust collector, thereby improving workability.

[0025] A part of the dust collection passage R leading to the dust box 60 is provided within the main body 2 as an internal hose 58 . Therefore, the portion of the dust collection passage R exposed to the outside of the electric hammer 1 is reduced, and the provision of the dust collection passage R does not interfere with work. The motor 6 is disposed on the impact axis L1. Therefore, the deviation of the center of gravity from the impact axis L1 is suppressed, and the overall balance can be maintained. The dust box 60 is disposed on the opposite side (upper side in this embodiment) of the striking mechanism unit 3 across the motor 6 on the striking axis L1. Therefore, even if the dust box 60 is provided, the deviation of the center of gravity from the impact axis L1 is suppressed, and the overall balance can be maintained.

[0026] The dust box 60 has a filter 70 with a filter surface 71 facing downward, and inside the dust box 60, air passes through the filter 70 from bottom to top. Therefore, the dust captured by the filter surface 71 is less likely to adhere to the filter surface 71, and the progress of clogging of the filter 70 can be delayed. A dust collection fan 45 and a cooling fan 40 for cooling the motor 6 are provided separately on either side of the axial direction of the rotary shaft 13 of the motor 6 . Therefore, the dust collection passage R and the passage for air that cools the motor 6 can be easily formed. Another part of the dust collection flow path R is formed by a flexible hose 75 that runs from the suction port 78 to the main body 2, and the main body 2 is provided with a connection port 59 for connecting to an internal hose 58 provided within the main body 2. This makes it easier to connect the internal hose 58 and the flexible hose 75. The striking axis L1 extends in the vertical direction, the bit B is attached to the lower side of the striking mechanism part 3, and the connection port 59 opens downward. Therefore, the flexible hose 75 connected to the connection port 59 can be routed vertically along the striking mechanism 3, and the flexible hose 75 is less likely to get in the way of work.

[0027] The dust box 60 is detachable from the main body 2 . This facilitates maintenance such as disposing of the collected dust and replacing and cleaning the filter 70. The cleaning device has a detection switch 63 that detects the attachment state of the dust box 60 to the main body 2, and a controller 50 that controls the driving of the motor 6, and the controller 50 does not drive the motor 6 when the attachment state of the dust box 60 is not detected by the detection switch 63. Therefore, work without the dust box 60 attached is restricted, and dust collection by the dust box 60 can be performed reliably.

[0028] Modifications of the present disclosure will be described below. The shape of the dust collection passage can be changed as appropriate. For example, the internal hose and the flexible hose can be arranged in the reversed left-right direction to those in the above embodiment, or can be arranged on the front or rear side. The shape of the dust collection attachment can also be changed as appropriate. The internal hose may extend into the lower housing as well as into the upper housing, in which case the connection port is also provided in the lower housing, making the flexible hose shorter. However, the part of the dust collection passage formed inside the main body is not limited to the internal hose. For example, the part of the dust collection passage may be partitioned by a wall provided inside the upper housing. The wall and the internal hose may be used together. The dust collection passage leading to the dust collector is not limited to being formed partly inside the main body, but may be formed outside the main body. For example, the flexible hose may be extended further upward and routed outside the main body, and directly connected to the dust box.

[0029] The dust box is not limited to a structure that is detachable from the main body in the vertical direction. The dust box may be detachable from the main body in the front-back or left-right direction. The position of the dust box does not have to be the top of the main body, but may be on the left or right side or at the front or back. The dust box detection means can also be changed according to the position of the dust box. The detection means may be a non-contact sensor. The detection means may be omitted and the motor may be driven by turning on the switch regardless of the presence or absence of the dust box. The filter in the dust box may be oriented vertically instead of horizontally. The thickness and shape of the filter may also be changed as appropriate. The dust collection chamber and the ventilation chamber may be arranged side by side or front to back. The dust collecting unit may be provided integrally with the main body, instead of being detachable. In this case, a cover for disposing of dust may be provided at the position of the dust collecting unit.

[0030] The motor is not limited to being disposed so that the rotation shaft faces the left-right direction, but may be disposed so that the rotation shaft faces the front-rear or up-down direction. The motor does not have to be on the impact axis. The cooling fan and the dust collection fan may be provided adjacent to one end of the rotating shaft instead of being separated at both ends. In this case, the blades for the cooling fan and the blades for the dust collection fan may be formed back-to-back on the front and back of the disk. The motion conversion mechanism is not limited to the above embodiment. There may be two or more intermediate shafts, or there may be no intermediate shaft. The second crankshaft, counterweight, or other vibration isolation mechanisms may be omitted. The power source is not limited to a commercial power source as in the above embodiment, but may be a battery. The battery may be removable or may be built-in. In the above embodiment, an electric hammer in which the impact mechanism is disposed below the main body and the impact axis extends in the vertical direction is illustrated, but the form of the electric hammer is not limited to this. For example, the present disclosure can be applied to a form in which the impact mechanism is disposed above the main body and the impact axis extends in the front-rear direction, or a form in which the impact mechanism is disposed in front of the main body and the impact axis extends in the front-rear direction, etc. [Explanation of symbols]

[0031] Description of the Reference Numerals: 1··Electric hammer, 2··Main body, 3··Striking mechanism, 4··Upper housing, 5··Lower housing, 6··Motor, 7··Motion conversion mechanism, 9··Switch, 13··Rotating shaft, 23··Piston, 29··Cylinder, 35··Tool holder, 37··Striker, 38··Impact bolt, 40··Cooling fan, 43··Air intake port, 45··Dust collection fan, 50··Controller, 55··Retaining recess, 58··Inner hose, 59··Connection port, 60··Dust box, 63··Detection switch, 66··Dust collection chamber, 70··Filter, 71··Filter surface, 75··Flexible hose, 77··Dust collection attachment, 78··Suction port, L1··Impact axis, L2··Axis of rotating shaft, R··Dust collection flow path.

Claims

1. An electric hammer including a main body having a built-in motor and a striking mechanism, the striking mechanism being actuated by driving the motor to strike a bit attached on a striking axis of the striking mechanism, a dust collection fan that rotates as the motor is driven; a dust collection flow path having a suction port that opens toward a tip side of the bit and generates a suction force at the suction port as the dust collection fan rotates; a dust collecting section provided on the dust collection passage for collecting the dust sucked through the suction port.

2. The electric hammer according to claim 1, wherein a part of the dust collection passage leading to the dust collection unit is provided inside the main body.

3. 3. The electric hammer according to claim 1, wherein the motor is disposed on the striking axis.

4. 4. The electric hammer according to claim 3, wherein the dust collecting unit is disposed on the striking axis on the opposite side of the striking mechanism unit with the motor interposed therebetween.

5. 5. The electric hammer according to claim 4, wherein the dust collecting section has a filter with a filter surface facing downward, and air passes through the filter from bottom to top within the dust collecting section.

6. 3. The electric hammer according to claim 1, wherein the dust collection fan and the cooling fan for cooling the motor are separately provided on either side of the rotation shaft of the motor in the axial direction.

7. The electric hammer according to claim 2, characterized in that another part of the dust collection flow path is formed by an external hose extending from the suction port to the main body, and the main body is provided with a connection port for connecting to the part of the dust collection flow path provided within the main body.

8. 8. The electric hammer according to claim 7, wherein the striking axis extends in a vertical direction, the bit is attached to a lower side of the striking mechanism, and the connection port opens downward.

9. 3. The electric hammer according to claim 1, wherein the dust collecting section is detachable from the main body.

10. An electric hammer as described in claim 9, characterized in that it has a detection means for detecting the attachment state of the dust collection unit to the main body and a controller for controlling the driving of the motor, and the controller does not drive the motor if the attachment state of the dust collection unit is not detected by the detection means.

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