CN213673951U - Impact tool - Google Patents

Abstract

The utility model provides an impact tool. An electric hammer as an impact tool includes: a main body housing having an impact mechanism; a handle portion connected to be relatively movable in an impact axis direction with respect to the main body housing; an elastic member interposed between the main body case and the handle portion; a sensor portion for detecting relative movement of the handle portion with respect to the body housing; and a controller for controlling the rotation speed of the motor to be lower than the rotation speed of the motor under no-load condition when the handle portion does not move relatively according to the detection state detected by the sensor portion, wherein the elastic member includes a coil spring for generating a biasing force for biasing the handle portion in a direction away from the main body case at the time of no-load condition and at the time of load condition, and a coil spring for generating a biasing force only at the time of load condition. Accordingly, the impact tool of the present invention can improve usability in the absence of load without impairing the vibration-proof function.

Description

Impact tool

Technical Field

The utility model relates to an impact tool such as hammer drill with antivibration mechanism.

Background

In an impact tool such as a hammer drill or an electric hammer, vibration is generated in association with an impact operation. In order to prevent the vibration from being transmitted to the hand of the operator holding the handle, an impact tool having a vibration prevention function is known, for example, as disclosed in patent document 1. The vibration-proof function is realized by the following structure: the handle portion is formed separately from the housing having the impact mechanism, is provided so as to be movable relative to the housing in the impact axis direction, and interposes an elastic member such as a coil spring between the handle portion and the housing.

As this impact tool, there is also known an impact tool having a rotation suppressing function under no load for reducing vibration, the rotation suppressing function under no load being: when the switch is turned ON (ON) when the tip bit is not pressed against the work piece, the rotation speed of the motor is set to be lower than that when the bit is pressed against the work piece. The movement of the handle portion when the drill is pressed against the workpiece is detected by the sensor portion, and the rotation speed at the time of no load and the rotation speed at the time of load are switched at that time. Namely, the following settings are set: the rotation speed is low until the sensor unit detects the movement of the handle unit after the switch is turned ON (ON), and is high after the sensor unit detects the movement of the handle unit.

[ Prior art documents ]

[ patent document ]

Patent document 1: german patent application publication No. 10036078.

SUMMERY OF THE UTILITY MODEL

[ technical problems to be solved by the utility model ]

However, since the initial load of the coil spring that biases the handle portion rearward is high, even when there is no load, the handle portion needs to be pressed with a strong force until the sensor portion detects the movement of the handle portion, resulting in poor usability. However, if the initial load of the coil spring is reduced, the handle portion may come into contact with the housing when pressed, and the vibration prevention function may be lost.

Therefore, an object of the present invention is to provide an impact tool having a vibration-proof function and a rotation suppression function in no-load operation, which can improve usability in no-load operation without impairing the vibration-proof function.

[ solution for solving problems ]

In order to achieve the above object, the present invention provides an impact tool, comprising: a motor, a main body case, a handle portion, an elastic member, a sensor portion, and a controller, wherein the main body case has at least an impact mechanism that operates by rotation of the motor; the handle portion is connected to be relatively movable in an impact axis direction of the impact mechanism with respect to the main body housing; the elastic component is arranged between the main body shell and the handle part; the sensor part is used for detecting the relative movement of the handle part relative to the main body shell; the controller controls the rotation speed of the motor to be lower than the rotation speed of the motor when the handle part does not move relatively under the no-load condition according to the detection state detected by the sensor part, wherein the elastic component comprises a 1 st elastic component and a 2 nd elastic component, the 1 st elastic component generates loading force when the handle part does not move relatively under the no-load condition and the load condition, and the loading force applies force to the handle part in the direction of separating from the main body shell; the 2 nd elastic member generates a loading force only when loaded.

Another aspect of the present invention is to provide the above structure, wherein the spring load of the 1 st elastic member is smaller than the spring load of the 2 nd elastic member.

In the above configuration, at least the upper portion of the handle portion is connected so as to be relatively movable with respect to the main body case, and the 1 st elastic member and the 2 nd elastic member are disposed between the handle portion and the main body case on the upper portion of the handle portion.

Another aspect of the present invention is to provide the above-described configuration, wherein the 2 nd elastic member is disposed at least 1 in each of the left and right sides with the 1 st elastic member interposed therebetween.

Another aspect of the present invention is characterized in that, in the above structure, the lower portion of the handle portion is connected so as to be capable of moving relative to the main body case, and a 3 rd elastic member is provided between the lower portion of the handle portion and the main body case, and the 3 rd elastic member generates a biasing force to bias the handle portion in a direction away from the main body case when no load is applied and when a load is applied.

Other technical means of the utility model are characterized in that, in above-mentioned structure, have the outside casing that covers the main part casing, outside casing sets up as an organic whole with handle portion.

The utility model discloses a characterized in that of other technical scheme, in above-mentioned structure, be provided with the battery installation department at handle portion an organic whole.

Another aspect of the present invention is to provide the above-described structure, wherein the 2 nd elastic member is in a non-contact state with the main body case or the handle portion until the sensor portion detects the relative movement of the handle portion.

Another aspect of the present invention is to provide the above structure, wherein the 1 st elastic member and the 2 nd elastic member are mounted on the main body case side.

Other technical means of the utility model are characterized in that, in above-mentioned structure, the motor is received in the motor casing, and this motor casing combines as an organic whole with the main part casing.

The present invention has another technical means in that, in the above structure, the main body case is disposed along the front-rear direction, the motor case is combined with the lower side of the main body case, and the motor is housed in the motor case in such a manner that the output shaft is oriented upward.

Another aspect of the present invention is to provide the above structure, wherein the 1 st elastic member and the 2 nd elastic member are coil springs.

In the above configuration, the coil spring is supported by the convex portion provided on the main body case side and the boss provided on the handle portion side, with both ends of the coil spring being externally fitted to the convex portion provided on the main body case side.

[ effects of the utility model ]

According to the utility model, the handle part is not required to be pressed by strong force from the no-load time to the load time. In addition, the elastic connection can be maintained even if the handle portion is pressed during loading, and the handle portion does not abut against the main body case. This can improve usability without a load without impairing the vibration-proof function.

According to another aspect, the usability from the no-load time to the load time can be further improved by making the spring load of the 1 st elastic member smaller than the spring load of the 2 nd elastic member.

According to another aspect, at least the upper portion of the handle portion is connected so as to be movable relative to the main body case, and the 1 st elastic member and the 2 nd elastic member are disposed between the handle portion and the main body case at the upper portion of the handle portion, whereby the urging forces of the 1 st elastic member and the 2 nd elastic member can be efficiently transmitted to the handle portion in the impact axis direction.

According to another aspect, at least 1 of the 2 nd elastic members is disposed on each of the left and right sides with the 1 st elastic member interposed therebetween, whereby the urging force of the 2 nd elastic member during the load can be transmitted to the handle portion in a well-balanced manner.

According to another aspect, the lower portion of the handle portion is connected to be movable relative to the main body case, and the 3 rd elastic member is provided between the lower portion of the handle and the main body case, and generates a biasing force for biasing the handle portion in a direction away from the main body case at the time of no load and at the time of load, whereby the handle portion can be biased with good vertical balance from the time of no load.

According to another aspect, the elastic member can be protected by the outer case by providing the outer case covering the main body case and integrating the outer case with the handle portion.

According to another aspect, the battery mounting portion is integrally provided on the handle portion, and thus the handle portion can be moved relatively stably.

According to another aspect, the 2 nd elastic member and the main body case are in a non-contact state until the sensor portion detects the relative movement of the handle portion, whereby the pressing force required in the no-load state can be reliably reduced.

According to another aspect, the 1 st and 2 nd elastic members are attached to the main body case side, whereby the handle portion can be easily assembled with the elastic member interposed therebetween.

Drawings

FIG. 1 is a central longitudinal cross-sectional view of the hammer drill.

Fig. 2 is an enlarged cross-sectional view of the vibration preventing portion (when no load is applied).

Fig. 3 is an explanatory view of the sensor unit, in which (a) shows a state in which the structure including the motor housing is viewed from the rear, and (B) shows a state in which only the sensor unit is viewed from the right.

Fig. 4 is an enlarged cross-sectional view of the vibration preventing portion (when loaded).

[ description of reference numerals ]

1: an electric hammer; 2: a main body case; 3: a motor housing; 4: an impact mechanism; 5: a motor; 6: an output shaft; 7: an outer housing; 8: a handle housing; 9: a handle portion; 16: a controller; 20: a tool holder; 31: 1 st vibration-proof part; 32A to 32C: a coil spring; 33A to 33C: a front boss; 34A to 34C: a rear boss; 40: a 2 nd vibration-proof part; 43: a coil spring; 50: a sensor section; 52: the member is shaken.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a central longitudinal sectional view showing an example of an electric hammer 1. The electric hammer 1 has a main body case 2 and a motor case 3. The main body case 2 houses the striking mechanism 4 and extends in the front-rear direction which is the axial direction of the striking shaft. The motor case 3 is integrally coupled to the lower side of the main body case 2, and houses a brushless motor 5 having an output shaft 6 directed upward. The output shaft 6 protrudes into the main body case 2.

In addition, the electric hammer 1 has an outer case 7 and a handle case 8. The outer case 7 extends in the front-rear direction and covers the outside of the main body case 2. The handle case 8 is integrally coupled to the rear side of the outer case 7, and is provided from the rear of the outer case 7 to below the motor case 3.

The handle case 8 has a handle portion 9 and a battery mounting portion 10. The handle portion 9 extends in the vertical direction, and has a connecting portion 9a on the front side, and the connecting portion 9a is connected to the rear end of the outer case 7 and covers the rear portion of the main body case 2 from behind. The handle portion 9 has a switch 11 and a switch operating handle 12. The battery mount 10 is formed by winding from the lower end of the handle portion 9 to the lower side of the motor housing 3. A locking portion 13 is formed at the upper end of the front surface of the battery mounting portion 10 so as to face rearward, and the locking portion 13 is locked from the front to a locking recess 14 formed at the lower end of the front surface of the motor case 3.

The battery mounting portion 10 is mounted with front and rear 2 battery packs 15, 15 serving as a power source. A controller 16 is housed in the battery mounting portion 10 in the front-rear direction above the battery packs 15, and the controller 16 has a control circuit board.

The impact mechanism 4 includes a cylindrical tool holder 20 and a cylinder 21. The tool holder 20 is held on the front side of the main body housing 2 and extends in the front-rear direction. The air cylinder 21 is held on the rear side of the main body housing 2 and extends in the front-rear direction coaxially with the tool holder 20.

A crankshaft 22 is supported in the main body case 2 in the vertical direction on the rear side of the cylinder 21. An eccentric pin 23 is provided so as to face upward on the upper side of the crankshaft 22, and a gear 24 is provided on the lower side of the crankshaft 22. The gear 24 meshes with a pinion provided at the upper end of the output shaft 6.

A piston 25 is housed in the cylinder 21 so as to be movable forward and backward. The piston 25 is connected to the eccentric pin 23 via a connecting rod 26. A ram 28 is housed in the cylinder 21 in a manner movable forward and backward through an air chamber 27 in front of the piston 25. A striker 29 is provided in the tool holder 20 in front of the hammer 28, and a drill (not shown) inserted into the front end abuts against the striker 29. An operation sleeve 30 for performing an operation of attaching and detaching the drill is provided at the distal end of the tool holder 20.

The outer case 7 and the handle case 8 are provided so as to be movable forward and backward relative to the main body case 2 and the motor case 3.

A 1 st vibration-proof portion 31 is provided between the main body case 2 and the handle portion 9. As shown in fig. 2, the 1 st vibration isolation portion 31 is formed by arranging 3 coil springs 32A to 32C having an axis in the front-rear direction at predetermined intervals in the left-right direction in the connection portion 9 a. The coil springs 32A to 32C extend across the front bosses 33A to 33C and the rear bosses 34A to 34C, and both ends thereof are externally fitted to the front bosses 33A to 33C and the rear bosses 34A to 34C, wherein the front bosses 33A to 33C and the rear bosses 34A to 34C are provided on the rear surface of the main body case 2 and the front surface of the handle portion 9, respectively. Ribs 35 are provided on the outer peripheries of the bottoms of the rear bosses 34A to 34C, respectively.

The front ends of the left and right 2 coil springs 32A, 32C are fitted into the front bosses 33A, 33C and fixed to the main body case 2. The rear ends of the coil springs 32A, 32C are externally fitted to the rear bosses 34A, 34C so as to be movable relative to the rear bosses 34A, 34C. Both ends of the pin 36 are inserted into the front bosses 33A, 33C and the rear bosses 34A, 34C, respectively.

The tip of the coil spring 32B at the center is also fitted into the front boss 33B and fixed to the main body case 2. The rear end of the coil spring 32B abuts against the rib 35 of the rear boss 34B.

A 2 nd vibration isolation portion 40 is provided between the motor case 3 and the battery mounting portion 10. The 2 nd vibration isolation portion 40 has a projecting piece 41, a receiving rib 42, and a coil spring 43. The protruding piece 41 is provided on the lower surface of the motor case 3 and protrudes downward into the battery mounting portion 10. The receiving rib 42 is erected in the battery mounting portion 10 at the rear of the protruding piece 41. The coil spring 43 is held between the projecting piece 41 and the receiving rib 42 in the front-rear direction.

The spring loads of the coil spring 32B in the center of the 1 st vibration isolation portion 31 and the coil spring 43 of the 2 nd vibration isolation portion 40 are set to be smaller than the spring loads of the 2 left and right coil springs 32A and 32C of the 1 st vibration isolation portion 31. In a normal state, the outer case 7 and the grip case 8 are elastically biased toward the retreated position of fig. 1 where the locking portion 13 of the battery mounting portion 10 abuts against the locking recess 14 of the motor case 3 by the biasing force of the coil springs 32B and 43. As shown in fig. 2, in the retreated position, the rear ends of the left and right 2 coil springs 32A and 32C of the 1 st vibration isolation portion 31 are positioned forward of the ribs 35 provided on the outer periphery of the base portions of the rear bosses 34A and 34C, and have a free length not to bias the handle case 8.

A sensor portion 50 for detecting relative movement of the handle case 8 is provided on the rear side of the motor 5 in the motor case 3. As also shown in fig. 3, the sensor portion 50 has a sensor substrate 51 and a rocking member 52. The sensor substrate 51 is supported in parallel with a plane defined in the vertical and longitudinal directions by a support member 53, and the support member 53 is provided in the motor housing 3. The sensor substrate 51 has a hall element 54 mounted on the right side, and can output a detection signal to the controller 16.

The pivot member 52 is a plate-like member extending in the vertical direction on the right side of the sensor substrate 51, and is rotatably supported on a surface parallel to the sensor substrate 51 by a support shaft 55, the support shaft 55 being provided on the support member 53 and projecting to the right. The lower end of the rocking member 52 has a rotation locus that swings on the right side of the hall element 54, and has a permanent magnet 56. The upper end of the pivot member 52 protrudes into the outer case 7. A torsion spring 57 is provided between the support member 53 and the rocking member 52, and the torsion spring 57 rotationally biases the rocking member 52 in a left rotational direction when viewed from the right side (fig. 3 (B)). In the normal state, the pivot member 52 is biased to an initial position (solid line position in fig. 3) at which the pivot member 52 abuts against a stopper 58 provided on the support member 53. In this initial position, the permanent magnet 56 is opposed to the hall element 54.

The handle portion 9 is provided with a pressing piece 60 protruding forward at the lower end of the connecting portion 9 a. The front end of the pressing piece 60 faces the upper end of the pivotal member 52 projecting upward from the motor housing 3 in the front-rear direction. In the retracted position of the handle case 8, the front end of the pressing piece 60 abuts on the upper end of the pivoting member 52 in the initial position.

A rotation speed adjustment dial 61 is provided below the sensor portion 50 and at a lower portion of the motor housing 3. The controller 16 drives the motor 5 at a rotation speed (impact speed) selected by the rotation operation of the rotation speed adjustment dial 61.

In the electric hammer 1 configured as described above, when there is no load that presses the drill attached to the tool holder 20 against the workpiece, the outer case 7 and the handle case 8 are located at the retracted position, and the rocking member 52 is located at the initial position. In the no-load state, when the switch operation lever 12 is pressed by a hand holding the handle portion 9 to turn ON (ON) the switch 11, the controller 16 drives the motor 5 at a low rotation speed set in advance, regardless of the rotation speed selected by the rotation speed adjustment dial 61 (no-load rotation suppression function). Thereby, the output shaft 6 rotates, the crankshaft 22 rotates via the gear 24, and the piston 25 moves forward and backward via the connecting rod 26. Accordingly, the hammer 28 is moved forward and backward in conjunction with the air chamber 27.

When the drill starts to be pressed against the workpiece, the outer case 7 and the handle case 8 advance against the biasing force of the coil spring 32B at the center of the 1 st vibration prevention part 31 and the coil spring 43 of the 2 nd vibration prevention part 40. Since the spring load of the coil springs 32B and 43 is small, the operator can use a small pressing force.

As the handle portion 9 of the handle case 8 advances, the pressing piece 60 presses the upper end of the pivoting member 52 forward in the sensor portion 50, and the pivoting member 52 rotates rightward when viewed from the right side against the urging force of the torsion spring 57 as indicated by the two-dot chain line in fig. 1 and 3 (B). Thereby, the permanent magnet 56 moves rearward from the position facing the hall element 54. The hall element 54 detects a change in the magnetic field caused by the movement, and the controller 16, which obtains the detection signal, causes the motor 5 to be driven at a high rotation speed selected by the rotation speed adjustment dial 61. This enables the machining operation to be performed at a high impact speed.

As shown in fig. 4, the ribs 35 and 35 of the rear bosses 34A and 34C abut on the rear ends of the left and right coil springs 32A and 32C, respectively, in the 1 st vibration isolating portion 31 while the rotation speed of the motor 5 is switched to a high rotation speed. Further pressing the handle portion 9 compresses the coil springs 32A and 32C. Thus, since the outer case 7 and the handle case 8 are elastically held by applying the biasing force of the coil springs 32A and 32C having a large spring load, the rear bosses 34A and 34C do not abut against the front bosses 33A and 33C even when the handle 9 is pressed. Therefore, it is possible to reduce the vibration transmitted from the impact mechanism 4 to the handle portion 9 while maintaining the vibration-proof function.

Thus, the electric hammer 1 of the above-described embodiment includes the motor 5 and the main body case 2, and the main body case 2 includes the impact mechanism 4 operated by the rotation of the motor 5. Further, the electric hammer 1 includes a handle portion 9 and coil springs 32A to 32C (elastic members), wherein the handle portion 9 is connected to the body case 2 so as to be relatively movable in the impact axis direction of the impact mechanism 4 with respect to the body case 2; the coil springs 32A to 32C (elastic members) are interposed between the main body case 2 and the handle portion 9. In addition, the electric hammer 1 includes a sensor portion 50 and a controller 16, wherein the sensor portion 50 is used to detect the relative movement of the handle portion 9 with respect to the body case 2; the controller 16 controls the rotation speed of the motor 5 in the no-load state in which the handle 9 does not move relatively to be smaller than the rotation speed of the motor 5 in the load state in which the handle 9 moves relatively, based on the detection state detected by the sensor unit 50. The elastic members include a coil spring 32B (1 st elastic member) and coil springs 32A and 32C (2 nd elastic member), wherein the coil spring 32B (1 st elastic member) generates a biasing force for biasing the handle portion 9 in a direction away from the main body case 2 when the spring is unloaded or loaded; the coil springs 32A, 32C (2 nd elastic member) generate a loading force only when loaded.

With this configuration, it is not necessary to press the handle portion 9 with a strong force from the time of no load to the time of load. In addition, even if the handle 9 is pressed during loading, the elastic connection can be maintained, and the handle 9 does not abut against the main body case 2. Thus, in the impact tool having the vibration-proof function and the rotation-suppressing function at the time of no-load, usability at the time of no-load can be improved without impairing the vibration-proof function.

In particular, the spring load of the coil spring 32B is smaller than the spring loads of the coil springs 32A, 32C. This makes the usability better from the time of no load to the time of load.

The upper portion of the handle 9 is connected to the main body case 2 so as to be movable relative to the main body case 2, and the coil springs 32A to 32C are disposed between the handle 9 and the main body case 2 on the upper portion of the handle 9. This allows the urging forces of the coil springs 32A to 32C to be efficiently transmitted to the handle portion 9 in the direction of the impact axis.

Further, 2 coil springs 32A and 32C are disposed on the left and right sides with the coil spring 32B interposed therebetween. This enables the urging forces of the coil springs 32A and 32C during loading to be transmitted to the handle portion 9 with good balance.

The battery mounting portion 10 at the lower portion of the handle portion 9 is connected to the motor housing 3 so as to be movable relative to the motor housing 3 integrated with the main body housing 2, and a coil spring 43 (3 rd elastic member) is provided between the battery mounting portion 10 and the motor housing 3, and the coil spring 43 (3 rd elastic member) generates biasing force for biasing the handle portion 9 in a direction away from the main body housing 2 at the time of no load or at the time of load. This makes it possible to urge the grip portion 9 with good vertical balance from the unloaded state.

In addition, the electric hammer 1 has an outer case 7 covering the main body case 2, and the outer case 7 is provided integrally with the handle portion 9. This also enables the outer case 7 to protect the coil springs 32A to 32C.

Further, a battery mounting portion 10 is integrally provided on the handle portion 9. This enables the handle 9 to stably move relative to the handle.

Until the sensor unit 50 detects the relative movement of the handle unit 9, the coil springs 32A and 32C are in a non-contact state with the main body case 2. This can reliably reduce the pressing force required in the no-load state.

The coil springs 32A to 32C are attached to the main body case 2. This makes it possible to easily assemble the handle case 8 with the 1 st vibration isolation portion 31 interposed therebetween.

In the above-described embodiment, the coil springs serving as the 1 st and 2 nd elastic members are attached to the front boss on the main body case side, but the coil springs may be attached to the rear boss on the contrary.

In addition, the 3 coil springs may be arranged in an up-down arrangement instead of a left-right arrangement. However, the number of coil springs is not limited to the above-described embodiment, and may be increased or decreased as appropriate. The spring load of all the coil springs may be the same, and the pressing force at the time of no load may be reduced. The coil spring serving as the 2 nd elastic member may not have a free length when no load is applied.

The number or arrangement of the coil springs to be the 3 rd elastic member may be changed or omitted.

The position and structure of the sensor unit can be changed as appropriate. The impact tool using the hall element and the permanent magnet is not limited, and a microswitch or the like can be used to detect the relative movement of the handle portion.

In addition, the structure of the electric hammer is not limited to the above-described one. The orientation and arrangement of the motors, the position of the controller, the position and number of the battery packs, and the like may also be changed.

Further, although the electric hammer is exemplified in the above embodiment, the present invention can also be applied to a hammer drill having a rotation mechanism of a tool holder.

Claims (13)

1. An impact tool, characterized in that,

has a motor, a main body case, a handle portion, an elastic member, a sensor portion, and a controller,

the main body housing has at least an impact mechanism operated by rotation of the motor;

the handle portion is connected to be relatively movable with respect to the body housing in an impact axis direction of the impact mechanism;

the elastic component is interposed between the main body housing and the handle portion;

the sensor portion detects relative movement of the handle portion with respect to the body housing;

the controller controls the rotation speed of the motor to be lower in a no-load state in which the handle portion does not move relative to the handle portion than in a load state in which the handle portion moves relative to the handle portion, based on the detection state detected by the sensor portion,

the elastic members include a 1 st elastic member and a 2 nd elastic member, wherein,

the 1 st elastic member generates a biasing force that biases the handle portion in a direction away from the body case at the time of the no-load and the load;

the 2 nd elastic member generates the loading force only at the time of the load.

2. Impact tool according to claim 1,

the spring load of the 1 st elastic member is smaller than the spring load of the 2 nd elastic member.

3. Impact tool according to claim 1 or 2,

at least an upper portion of the handle portion is connected to be relatively movable with respect to the main body case, and the 1 st elastic member and the 2 nd elastic member are disposed between the handle portion and the main body case at the upper portion of the handle portion.

4. Impact tool according to claim 1,

at least 1 of the 2 nd elastic members is disposed on each of the left and right sides with the 1 st elastic member interposed therebetween.

5. Impact tool according to claim 1,

the lower portion of the handle portion is connected so as to be relatively movable with respect to the main body case, and a 3 rd elastic member that generates a biasing force that biases the handle portion in a direction away from the main body case at the time of the no-load and the load is provided between the lower portion of the handle portion and the main body case.

6. Impact tool according to claim 1,

an outer case covering the main body case is provided, and the outer case is integrally provided with the handle portion.

7. Impact tool according to claim 1,

the handle portion is integrally provided with a battery mounting portion.

8. Impact tool according to claim 1,

the 2 nd elastic member is in a non-contact state with the body housing or the handle portion until the sensor portion detects the relative movement of the handle portion.

9. Impact tool according to claim 1,

the 1 st elastic member and the 2 nd elastic member are mounted on the main body case side.

10. Impact tool according to claim 1,

the motor is housed in a motor case, and the motor case is integrated with the main body case.

11. The impact tool of claim 10,

the motor housing is coupled to a lower side of the main body housing, and the motor is housed in the motor housing with an output shaft directed upward.

12. Impact tool according to claim 1,

the 1 st elastic member and the 2 nd elastic member are coil springs.

13. The impact tool of claim 12,

the coil spring is supported such that both ends thereof are externally fitted to a boss provided on the main body case side and a boss provided on the handle portion side, respectively.

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