JP2013248708A - Noise suppressing device for impact tool and impact tool having noise suppressing device for impact tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise suppressing device for an impact tool that effectively suppresses noise generated by an impact tool, and to provide the impact tool having the noise suppressing device for the impact tool.SOLUTION: In a noise suppressing device 4 for an impact driver, a hammer case 20 into which a rotating shaft 25 of a motor is inserted is mounted in front of a housing 2 containing the motor 8. The hammer case includes an output shaft 42 that receives rotation transmitted from the motor and extends from a tip of the hammer case and an impacting mechanism 41, 43 for delivering impacts to the output shaft. The noise suppressing device for the impact driver is attached to an impact driver 1 having a tip tool 6 coaxially mounted to the output shaft, and suppresses noise generated when an impact is delivered to the output shaft by the impacting mechanism. The noise suppressing device includes a cover member 51 for covering the hammer case from the front, a spring receiving member 52 integrated with the tip tool in the axial direction thereof while the tip tool has been slidably mounted to the output shaft in the axial direction thereof, and a coil spring 53 disposed between the cover member and the spring receiving member in the axial direction of the tip tool.

Description

  The present invention has a hammer case assembled in front of a housing for housing a motor, the hammer case being rotated from the motor and projecting from the tip of the hammer case, and the hammer is imparted to the output shaft. The present invention relates to a striking tool noise suppressing device that is attached to a striking tool that is coaxial with the output shaft and has a tip tool attached thereto, and a striking tool having the striking tool noise suppressing device.

  For example, Patent Document 1 discloses that as a soundproof structure for an impact driver, a hammer case is assembled in front of a housing that houses a motor, and a sound absorbing material is attached to the outer periphery of the hammer case. In the impact driver described in Patent Document 1, the hammer case includes an output shaft that protrudes from the tip of the hammer case, and a striking mechanism that is internally provided to give a striking force to the output shaft. The sound generated when the shaft is hit can be suppressed by the sound absorbing material.

  Further, in Patent Document 2, as a connection tool that is connected to an impact driver to reduce noise, a socket adapter that is detachably mounted on an output shaft that protrudes from the tip of a hammer case having a striking mechanism, and a tip tool Is provided with a bit adapter to be detachably mounted, and the socket adapter and the bit adapter are fitted via an elastic body. In the impact driver described in Patent Document 2, the vibration in the axial direction of the output shaft generated when the impact is applied to the output shaft by the impact mechanism is absorbed by the elastic body, and the screw member is tightened from the tip tool. It becomes difficult to be transmitted to the object. As a result, it is possible to suppress noise generated from the object due to vibration transmitted to the object.

JP-A-9-109044 JP 2007-54934 A

  However, in the impact tool represented by the impact driver, when the screw member is fastened to the object with the tip tool, both the impact sound and the noise generated from the object are generated as described above. As in the case of the impact driver 1, even if the impact sound that becomes noise is suppressed by the sound absorbing material, there is an inconvenience that the noise generated from the object cannot be suppressed.

  On the other hand, even in the impact driver of Patent Document 2, although it is possible to suppress the noise generated from the object by absorbing the vibration in the axial direction of the output shaft with the elastic body, the impact sound cannot be suppressed. There is an inconvenience. Therefore, it has been desired to further suppress noise generated from the impact driver.

  The present invention has been proposed in view of such circumstances, and provides a striking tool noise suppression device that has improved the suppression effect of noise generated from the striking tool, and a striking tool having the striking tool noise suppression device. The purpose is to do.

  According to a first aspect of the present invention, there is provided a hammering tool noise suppression device comprising: a hammer case into which a rotating shaft of the motor is inserted in front of a housing that houses the motor; and the hammer case is transmitted from the motor. An output shaft projecting from the tip of the hammer case, and a striking mechanism provided in order to give a hit to the output shaft, and is attached to a striking tool that is coaxial with the output shaft and has a tip tool attached thereto. A hammering tool noise suppressing device for suppressing noise generated when the hammering is applied to the output shaft by the hammering mechanism, the cover member covering the hammer case from the front, and the output shaft, A spring receiving member provided integrally with the tip tool in the axial direction of the tip tool in a state in which the tip tool is slidable in the axial direction, and the cover portion in the axial direction of the tip tool Characterized in that it comprises a coil spring disposed between the spring receiving member and.

  According to a second aspect of the present invention, in the first aspect, the coil spring is divided into two in the axial direction of the tip tool, and the one coil spring disposed on the cover member side and the spring receiving member side A weight is interposed between the coil spring and the other coil spring.

  The invention of claim 3 is characterized in that, in claim 2, the cover member is formed integrally with the weight so as to cover the one coil spring.

  According to a fourth aspect of the present invention, in the first or second aspect, the cover member is attached to the outer surface of the hammer case via an elastic body.

  According to a fifth aspect of the present invention, there is provided an impact tool in which a hammer case into which a rotating shaft of the motor is inserted is assembled in front of a housing that houses the motor, and the hammer case is transmitted from the motor to the hammer case. A striking tool comprising an output shaft protruding from a tip of the head and a striking mechanism provided in order to give a hit to the output shaft, the tip tool being coaxially mounted on the output shaft. It has the noise suppression apparatus for impact tools in any one of 1-4.

According to the striking tool noise suppression device of the first aspect of the invention and the striking tool of the fifth aspect of the invention, the cover member covers the hammer case so that the striking mechanism applies the striking to the output shaft. It suppresses that the generated hitting sound leaks to the outside of the cover member.
In addition, the coil spring disposed between the cover member and the spring receiving member alleviates the vibration in the axial direction of the output shaft that occurs when the output shaft is struck, so that this vibration is reduced to the tip tool. For example, it becomes difficult to transmit to the target object which tightens a screw member. As a result, it is possible to suppress noise generated from the object due to vibration transmitted to the object.
Therefore, both the suppression of the leakage of the impact sound to the outside of the cover member and the suppression of the noise generated from the object are possible, thereby enhancing the effect of suppressing the noise generated from the impact tool. be able to.
According to the invention of claim 2, the vibration damping effect can be enhanced by the weight of the weight. Therefore, since the vibration in the axial direction of the output shaft is further reduced, it is possible to further suppress the vibration from being transmitted from the tip tool to the object.
According to the invention of claim 3, the cover member can cover from the front of the output shaft to the hammer case. Therefore, the effect which suppresses the leak of the impact sound to the exterior of a cover member can be improved.
According to the fourth aspect of the present invention, the vibration generated in the hammer case when the impact is imparted to the output shaft by the striking mechanism is mitigated by the elastic body, so that it is difficult to be transmitted to the cover member. Therefore, noise generated from the cover member due to vibrations transmitted to the cover member can be suppressed.

It is the whole impact driver perspective view which attached the noise suppression device for impact drivers of Embodiment 1 of the present invention. It is a sectional side view of the impact driver of Embodiment 1. It is the whole impact driver perspective view which attached the noise suppression device for impact drivers of Embodiment 2. It is a sectional side view of the impact driver of Embodiment 2. It is the whole impact driver perspective view which attached the noise suppression device for impact drivers of Embodiment 3. It is a sectional side view of the same impact driver of Embodiment 3. It is a whole perspective view of the impact driver which attached the noise suppression apparatus for impact drivers of Embodiment 4. It is a sectional side view of the same impact driver of Embodiment 4.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the impact driver 1 includes a main body housing 2, a battery pack 3, and an impact driver noise suppression device 4. The main body housing 2 includes a body portion 5, a handle portion 6, and a battery holding portion 7. The body portion 5 is formed in a substantially cylindrical shape and extends in the front-rear direction of the impact driver 1 (the left-right direction in FIGS. 1 and 2). A motor 8 (see FIG. 2) is accommodated in the body portion 5. The impact driver 1 is an example of the impact tool of the present invention, and the main body housing 2 is an example of the housing of the present invention.

  The handle portion 6 is connected to the body portion 5 and extends below the body portion 5 so that the impact driver 1 has a substantially T shape in a side view. As shown in FIG. 2, a switch 11 having a trigger 10 is accommodated in the handle portion 6. The battery holding part 7 is formed at the lower end of the handle part 6. The battery pack 3 is detachably attached to the battery holding unit 7. The battery pack 3 supplies power to the motor 8 when the switch 11 is turned on by pushing the trigger 10 into the handle portion 6.

  On the other hand, as shown in FIG. 2, a hammer case 20 is assembled in front of the body portion 5 (right side in the drawing). The hammer case 20 is formed in a bell-shaped cylindrical body from metal (for example, aluminum). The hammer case 20 has a small diameter cylindrical portion 21 at the front end. A circular cap-shaped bearing box 22 is integrally coupled to the opening at the rear end (left side in FIG. 2) of the hammer case 20. The bearing box 22 has a bearing portion 23 that is formed annularly projecting toward the motor 8 side. A ball bearing 24 is held on the bearing portion 23. An insertion hole 26 for the rotating shaft 25 of the motor 8 is provided on the rear end surface of the bearing portion 23. The rotating shaft 25 to which the pinion 27 is attached is inserted into the hammer case 20 through the insertion hole 26 and is supported by a ball bearing 24.

  Further, the hammer case 20 accommodates a spindle 28 and a striking mechanism 40. The spindle 28 is accommodated in the hammer case 20 coaxially with the hammer case 20. A hollow portion 29 is formed at the rear end of the spindle 28. The outer periphery of the rear end of the spindle 28 is supported by a ball bearing 30 held in the bearing box 22. Two planetary gears (not shown) are rotatably supported at the front portion of the ball bearing 30. The planetary gear is exposed in the hollow portion 29 and meshes with the pinion 27 inserted into the hollow portion 29.

  The striking mechanism 40 includes a hammer 41 and a first coil spring 43, and imparts striking to the anvil 42 as will be described later. The hammer 41 is connected to the spindle 28 via a ball (not shown) fitted in a cam groove on the outer periphery of the spindle 28 so as to be rotatable integrally with the spindle 28 and movable in the axial direction of the spindle 28. The anvil 42 is axially supported coaxially with the hammer 41 by a bearing in the cylindrical portion 21 in front of the hammer 41, and protrudes from the tip of the hammer case 20 through the cylindrical portion 21. A tubular member 44 through which the anvil 42 is inserted is connected to the tubular portion 21, and an annular engagement protrusion 45 projects outward from the distal end side outer surface of the tubular member 44. The anvil 42 is an example of the output shaft of the present invention.

  Furthermore, the anvil 42 has an insertion hole 47 for a bit 46 that extends in the axial direction X and opens to the front surface. The bit 46 is used for tightening the screw member to the object. The bit 46 is inserted into the insertion hole 47 so as to be slidable in the axial direction X so as to be able to transmit the rotation, and can be attached to the anvil 42 coaxially. . The first coil spring 43 is attached to the outer periphery of the spindle 28 and urges the hammer 41 to a forward position where the hammer 41 is engaged with the anvil 42. The bit 46 is an example of the tip tool of the present invention.

  On the other hand, the impact driver noise suppression device 4 includes a cover member 51, a spring receiving member 52, and a second coil spring 53. As shown in FIGS. 1 and 2, the cover member 51 is made of metal (for example, made of aluminum) and is used to cover the han case 20 from the front (right side in FIGS. 1 and 2). The cover member 51 is formed at the front end of a cylindrical portion 55 (see FIG. 2) having a diameter larger than that of the hammer case 20 and is a cylindrical extending portion having a diameter smaller than that of the cylindrical portion 55 and larger than that of the cylindrical portion 21. 56 (see FIG. 2) is extended. A rubber ring 57 is attached to the inner peripheral surface of the rear end portion of the cylindrical portion 55. A rubber ring 58 is also attached to the inner peripheral surface of the extended portion 56. As shown in FIG. 2, the cylindrical portion 55 of the cover member 51 is attached to the outer surface of the hammer case 20 with a rubber ring 57 interposed, and the extending portion 56 has a cylindrical portion 21 with a rubber ring 58 interposed. It is attached to the outer surface. The impact driver noise suppression device 4 is an example of the impact tool noise suppression device of the present invention, and the rubber rings 57 and 58 are examples of the elastic body of the present invention.

  The spring receiving member 52 is formed in a cylindrical shape extending in the axial direction of the bit 46 (left and right direction in FIGS. 1 and 2) and having a diameter-expanded portion 59 formed on the front end side. As shown in FIG. 2, the spring receiving member 52 has a through hole 60 that passes through the shaft center. A bit 46 can be inserted into the through hole 60. Further, the diameter of the front end side of the through hole 60 is increased, and the ball bearing 61 is held in the expanded diameter portion. A cylindrical support member 62 is rotatably attached to the ball bearing 61, and the bit 46 is press-fitted into the support member 62. As a result of the bit 46 being press-fitted into the support member 62 of the spring receiving member 52, the spring receiving member 52 is provided integrally with the bit 46 in the axial direction of the bit 46.

  As shown in FIGS. 1 and 2, the second coil spring 53 is disposed between the cover member 51 and the spring receiving member 52 in the axial direction of the bit 46. Here, the second coil spring 53 is mounted on the outer surface of the anvil 42 protruding from the hammer case 20 and the outer surface of the spring receiving member 52, and is disposed between the engagement protrusion 45 and the enlarged diameter portion 59 in the axial direction. Has been. As shown in FIG. 2, the second coil spring 53 normally biases the spring receiving member 52 forward. At this time, the rear end surface of the bit 46 is biased to a position where it does not come into contact with the bottom surface of the insertion hole 47 by the biasing force of the second coil spring 53. The second coil spring 53 is an example of the coil spring of the present invention.

  Next, the operation of the impact driver 1 of this embodiment will be described. In the impact driver 1, the striking mechanism 40 applies intermittent striking in the rotational direction to the anvil 42 as described below. The operator 8 moves the impact driver 1 toward the object and presses the trigger 10 into the handle portion 6 while pressing the bit 46 attached to the anvil 42 against the object. The spindle 28 is rotated by driving. Then, the anvil 42 rotates through the hammer 41, and the screw member can be fastened to the object with the bit 46. When the load on the anvil 42 increases as the screw member is tightened, the hammer 41 moves backward against the urging force of the first coil spring 43 along with the backward movement along the cam groove of the ball. Release the engagement. By repeating this engagement / disengagement, intermittent hitting in the rotational direction is applied to the anvil 42.

  During the tightening operation of the screw member, vibration is generated in the axial direction X (see FIG. 2) of the anvil 42 due to the impact of the hammer 41 applied to the anvil 42. When this vibration is transmitted in the order of the anvil 42, the bit 46, and the screw member fastened to the object, it is considered that noise is generated from the object due to the vibration of the object. In order to suppress this, in the present embodiment, the vibration in the axial direction X is reduced by the second coil spring 53 disposed between the spring receiving member 52 and the cover member 51. Thereby, the vibration in the axial direction X is hardly transmitted to the object. Therefore, noise generated from the object due to vibrations transmitted to the object can be suppressed. Further, as shown in FIG. 2, the rear end surface of the bit 46 is separated from the bottom surface of the insertion hole 47 in the axial direction X, so that vibration is generated from the bottom surface of the insertion hole 47 during the tightening operation of the screw member. 46 can be prevented from being transmitted directly. Also from such a thing, the noise transmitted from a target object can be suppressed as a result of suppressing the vibration transmitted to the bit 46. FIG.

  In the present embodiment, as shown in FIG. 2, the cover member 51 covers the hammer case 20 from the front, so that the hammer 41 and the anvil 42 collide in the hammer case 20 during the tightening operation of the screw member. The generated striking sound is reflected by the cover member 51. For this reason, it is possible to suppress the impact sound from leaking outside the cover member 51.

  Further, during the tightening operation of the screw member, vibration occurs in the hammer case 20 due to the collision between the hammer 41 and the anvil 42. When this vibration is transmitted to the cover member 51, it is conceivable that noise is generated from the cover member 51 due to the vibration of the cover member 51. In order to suppress this, in the present embodiment, the rubber ring 57 interposed between the hammer case 20 and the cylindrical portion 55 of the cover member 51, or the extended portion of the cylindrical portion 21 of the hammer case 20 and the cover member 51. The vibration transmitted from the hammer case 20 to the cover member 51 is mitigated by the rubber ring 58 interposed between the hammer case 20 and the rubber ring 58. Thereby, the vibration generated in the hammer case 20 is not easily transmitted to the cover member 51. Therefore, noise generated from the cover member 51 due to vibration transmitted to the cover member 51 can be suppressed.

<Effect of Embodiment 1>
In the impact driver 1 and the impact driver noise suppression device 4 of the present embodiment, the cover member 51 covers the han case 20 from the front, so that the impact sound generated when the hammer 41 applies the impact to the anvil 42 is covered. Leakage to the outside of the member 51 is suppressed.
In addition, the second coil spring 53 disposed between the cover member 51 and the spring receiving member 52 reduces the vibration in the axial direction X of the anvil 42 that occurs when the anvil 42 is hit. Vibration is hardly transmitted from the bit 46 to the workpiece through the screw member. As a result, it is possible to suppress noise generated from the object due to vibration transmitted to the object.
Therefore, both the suppression of the leakage of the impact sound to the outside of the cover member 51 and the suppression of the noise generated from the object are possible, thereby suppressing the noise generated from the impact driver 1. Can be increased.

  Further, the vibration generated in the hammer case 20 when the hammer 41 gives a hit to the anvil 42 is mitigated by the rubber rings 57 and 58 interposed between the hammer case 20 and the cover member 51, thereby covering the cover. It becomes difficult to be transmitted to the member 51. Therefore, the noise generated from the cover member 51 due to the vibration transmitted to the cover member 51 can be suppressed.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. Here, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the impact driver 1 </ b> A of the present embodiment, the impact driver noise suppression device 4 </ b> A includes a cover member 51, a spring receiving member 52, a weight 65, a third coil spring 66, and a fourth coil spring 67. In the present embodiment, as shown in FIG. 4, a weight 65 is interposed between the third coil spring 66 and the fourth coil spring 67.

  As shown in FIG. 4, a ring-shaped projecting portion 64 projects outward from the enlarged diameter portion 59 on the outer periphery of the front portion of the enlarged diameter portion 59 of the spring receiving member 52. The weight 65 is formed in a cylindrical shape from metal (for example, aluminum), and is disposed between the cover member 51 and the spring receiving member 52 in the axial direction of the bit 46. As shown in FIG. 4, a partition wall 68 is formed on the inner surface of the weight 65 to partition the bit 46 into the cover member 51 side and the spring receiving member 52 side in the axial direction. The partition wall 68 is provided with a projecting portion 69 projecting in a columnar shape toward the spring receiving member 52 side. A through hole 70 is formed in the center of the projecting portion 69 so as to penetrate the cover member 51 side and the spring receiving member 52 side. A spring receiving member 52 integrated with the bit 46 can be inserted into the through hole 70.

  Further, as shown in FIG. 4, the third coil spring 66 is disposed between the cover member 51 and the weight 65 in the axial direction of the bit 46. Here, the third coil spring 66 is mounted on the outer surface of the anvil 42 protruding from the hammer case 20 and the outer surface of the spring receiving member 52 that has entered the cover member 51 through the through hole 70, and the engagement protrusion 45 in the axial direction. And the partition wall 68.

  On the other hand, as shown in FIG. 4, the fourth coil spring 67 is disposed between the weight 65 and the spring receiving member 52 in the axial direction of the bit 46. Here, the fourth coil spring 67 is mounted on the outer surface of the protruding portion 69 and the outer surface of the spring receiving member 52 and is disposed between the spring receiving member 52 side of the partition wall 68 and the protruding portion 64 in the axial direction. ing. The third coil spring 66 is an example of one coil spring of the present invention, and the fourth coil spring 67 is an example of the other coil spring of the present invention.

  Next, the operation of the impact driver 1A of this embodiment will be described. In the present embodiment, as in the first embodiment, vibration is generated in the axial direction X of the anvil 42 due to the impact applied by the hammer 41 to the anvil 42 during the tightening operation of the screw member. This vibration is alleviated by the third coil spring 66 and the fourth coil spring 67 when transmitted in the order of the third coil spring 66, the weight 65 and the fourth coil spring 67. In addition, when the weight 65 interposed between the third coil spring 66 and the fourth coil spring 67 is used, the damping effect can be enhanced by the weight of the weight 65. Thereby, the vibration transmitted from the anvil 42 to the bit 46 can be suppressed. Therefore, by using the weight 65 in addition to the third coil spring 66 and the fourth coil spring 67, vibration generated in the axial direction X can be further alleviated. As a result, the vibration in the axial direction X is more difficult to be transmitted to the object, so that noise generated from the object can be further suppressed.

<Effect of Embodiment 2>
In the impact driver 1 </ b> A and the impact driver noise suppression device 4 </ b> A of the present embodiment, the vibration damping effect can be enhanced by the weight of the weight 65. Therefore, the vibration in the axial direction X of the anvil 42 is further alleviated, so that this vibration can be further suppressed from being transmitted from the bit 46 to the object.

<Embodiment 3>
Embodiment 3 of the present invention will be described with reference to FIGS. Here, the same configurations as those of the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. In the impact driver 1B of the present embodiment, the impact driver noise suppression device 4B includes a cover member 51B, a spring receiving member 52, a fifth coil spring 73, and a sixth coil spring 74.

  As illustrated in FIG. 6, the cover member 51 </ b> B is made of metal (for example, aluminum) and covers the front of the anvil 42 protruding from the hammer case 20 to the hammer case 20 in a non-contact manner. A weight 76 is integrally provided at the front end of the cover member 51B. The weight 76 has a cylindrical shape protruding toward the front of the cover member 51B. A communication hole 77 is formed at the center of the weight 76 to communicate the inside and the outside of the cover member 51B. The spring receiving member 52 integrated with the bit 46 can be inserted into the communication hole 77. As shown in FIG. 6, the cover member 51 </ b> B of the present embodiment is supported by a spring receiving member 52 inserted through the communication hole 77.

  Further, as shown in FIG. 6, the fifth coil spring 73 is disposed between the hammer case 20 and the weight 76 in the axial direction of the bit 46 in the cover member 51B. Here, the fifth coil spring 73 is mounted on the outer surface of the anvil 42 protruding from the hammer case 20 and is disposed between the engagement protrusion 45 and the weight 76 in the axial direction.

  On the other hand, as shown in FIG. 6, the sixth coil spring 74 is attached to the outer surface of the weight 76 and the outer surface of the spring receiving member 52, and the front end surface of the cover member 51 </ b> B and the spring receiving member 52 in the axial direction of the bit 46. It arrange | positions between the protrusion parts 64. FIG.

  Next, the operation of the impact driver 1B of this embodiment will be described. In the present embodiment, the cover member 51B covers from the front of the anvil 42 to the hammer case 20, so that compared to the cover member 51 only covering the hammer case 20 as in the first embodiment, the hammer 41 and the anvil 42 It is possible to widen the range covering the area where the impact sound is generated by collision. Along with this, it is possible to enhance the effect of suppressing the leakage of impact sound to the outside of the cover member 51B. In addition to this, similarly to the second embodiment, the vibration generated in the axial direction X can be reduced by the two coil springs 73 and 74 and the damping effect can be enhanced by the weight 76.

<Effect of Embodiment 3>
In the impact driver 1B and the impact driver noise suppression device 4B according to the present embodiment, the cover member 51B covers the front of the anvil 42 to the hammer case 20, and has the effect of suppressing the impact sound leakage to the outside of the cover member 51B. By raising, the effect of suppressing noise generated from the impact driver 1B can be further enhanced.

<Embodiment 4>
Embodiment 4 of the present invention will be described with reference to FIGS. Here, the same configurations as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted. In the impact driver 1C of the present embodiment, the impact driver noise suppression device 4C includes a cover member 51C, a spring receiving member 52, a weight 65, a third coil spring 66, and a fourth coil spring 67.

  The cover member 51 </ b> C includes a cylindrical portion 55 </ b> C made of stainless steel and having a diameter larger than that of the hammer case 20. As shown in FIG. 8, the cylindrical part 55C has a double structure in which the space between the inner cylinder 79 and the outer cylinder 80 of the cylindrical part 55C is reduced or vacuumed.

  Next, the operation of the impact driver 1C of this embodiment will be described. In the present embodiment, the cylindrical portion 55C covering the hammer case 20 has a double structure, and the space between the inner cylinder 79 and the outer cylinder 80 of the cylindrical portion 55C is reduced or vacuumed, so that the hammer 41 and the anvil are formed. It is possible to suppress the impact sound generated by colliding with 42 from escaping from the inner cylinder 79 to the outer cylinder 80. As a result, it is possible to make it difficult for leakage sound to leak to the outside of the cover member 51C.

<Effect of Embodiment 4>
In the impact driver 1C and the impact driver noise suppression device 4C according to the present embodiment, the impact sound is hardly leaked to the outside of the cover member 51C by the cylindrical portion 55C of the cover member 51C, thereby generating noise generated from the impact driver 1C. Can be suppressed.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. In the embodiment described above, an example in which the cover member that covers the hammer case 20 is formed of aluminum is shown. However, unlike this, the cover member may be formed of metal such as iron or resin. In the above-described first to fourth embodiments, the example in which the coil spring is used to reduce the vibration in the axial direction X of the anvil 42 has been shown. The vibration of X may be relaxed. Further, in the above-described embodiment, an example in which the present invention is applied to an impact driver has been described, but the present invention may be applied to an impact wrench instead.

  1, 1A to 1C ··· impact driver, 2 · · body housing, 4 and 4A to 4C · · impact driver noise suppression device, 8 · · motor, 20 · · hammer case, 25 · · rotating shaft of the motor, 41 · · Hammer, 42 · · Anvil, 43 · · First coil spring, 46 · · Bit, 51, 51B, 51C · · Cover member, 52 · · Spring receiving member, 53, 66, 67, 73, 74 · · Coil spring, 57, 58 ... Rubber ring, 65, 76 ... Weight

Claims (5)

A hammer case into which a rotating shaft of the motor is inserted is assembled in front of a housing that houses the motor, and the hammer case is rotated from the motor and protrudes from the tip of the hammer case; and the output A striking mechanism provided in the shaft for imparting striking to the shaft, and is attached to a striking tool coaxial with the output shaft and fitted with a tip tool, and the striking mechanism imparts the striking to the output shaft. A noise suppression device for a striking tool that suppresses noise generated when
A cover member that covers the hammer case from the front;
A spring receiving member provided integrally with the tip tool in the axial direction of the tip tool in a state where the tip tool is mounted on the output shaft so as to be slidable in the axial direction;
A coil spring disposed between the cover member and the spring receiving member in the axial direction of the tip tool;
A noise suppression device for a striking tool, comprising:   The coil spring is divided into two in the axial direction of the tip tool, and between the one coil spring arranged on the cover member side and the other coil spring arranged on the spring receiving member side. The noise suppression device for an impact tool according to claim 1, wherein a weight is interposed in the impact tool.   3. The noise suppression device for an impact tool according to claim 2, wherein the cover member is formed integrally with the weight so as to cover the one coil spring. 4.   The impact suppression device for noise according to claim 1 or 2, wherein the cover member is attached to an outer surface of the hammer case via an elastic body. A hammer case into which a rotating shaft of the motor is inserted is assembled in front of a housing that houses the motor, and the hammer case is rotated from the motor and protrudes from the tip of the hammer case; and the output A striking mechanism provided internally for imparting striking to the shaft, and a striking tool having a tip tool coaxially mounted on the output shaft,
An impact tool comprising the noise suppression device for an impact tool according to any one of claims 1 to 4.

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