JP2021142600A - Working tool - Google Patents

Abstract

To provide a working tool that can be used without being restricted in a use environment, in a structure equipped with an auxiliary handle.SOLUTION: An electric tool 10 is equipped with a body portion 11, and an auxiliary handle 20 detachably attached to the body portion 11. The auxiliary handle 20 has a grip detecting portion 25 that detects the gripping of the auxiliary handle 20 by a user and transmits a grip detection signal, a signal transmitting portion 26 that transmits the grip detection signal received from the grip detecting portion 25, and a non-contacting power receiving portion 24 to which power is supplied form the body portion 11 side. The body portion 11 has a drive portion 17 for driving a tip end tool, a signal receiving portion 19 that receives the grip detection signal from the signal transmitting portion 26, a control portion 16 that operates the drive portion on the basis of the grip detection signal received in the signal receiving portion 19, and a non-contacting power feeding portion 18 that supplies power to the auxiliary handle 20.SELECTED DRAWING: Figure 3

Description

The present invention relates to, for example, a work tool such as an electric screwdriver, a grinder, a jigsaw, a chainsaw, or the like, in which a tip tool is driven by electric power or air to perform various operations.

At work sites and factories, work tools such as drills and screwdrivers that are rotationally driven by a motor to perform desired work are widely used (see, for example, Patent Document 1).
Among such work tools, there is a work tool in which an auxiliary handle is attached to the main body so that the user can use the work tool in a stable state.
For example, in Patent Document 1, in order to prevent an accident such as injury caused by the user not holding the auxiliary handle firmly, the user detects the grip of the auxiliary handle and limits the output torque. The power tool that performs the above is disclosed.

Japanese Patent No. 5899471 Japanese Patent No. 5914809

However, the above-mentioned conventional power tool (work tool) has the following problems.
That is, in the power tool disclosed in the above publication, since there is no power supply on the auxiliary handle side, it is necessary to supply electric power to the auxiliary handle from the main body side. In this case, if the power supply from the main body to the auxiliary handle is a contact method, the contact part may be exposed when the auxiliary handle is not attached, which may cause a short circuit or rust. The usage environment of power tools is restricted.

An object of the present invention is to provide a work tool that can be used without being restricted by a usage environment in a configuration provided with an auxiliary handle.

The work tool according to the first invention is a work tool that drives a mounted tip tool to perform a predetermined work, and is attached to the main body and the main body in a detachable state for work. It is equipped with an auxiliary handle, which is sometimes gripped by the user. Power is supplied to the auxiliary handle from the grip detection unit that detects the grip of the auxiliary handle by the user and transmits the grip detection signal, the transmission unit that transmits the grip detection signal received from the grip detection unit, and the main body side. It has a non-contact power receiving unit. The main body includes a drive unit that drives the tip tool, a reception unit that receives a grip detection signal from the transmission unit, a control unit that operates the drive unit based on the grip detection signal received by the reception unit, and an auxiliary handle side. It has a non-contact power supply unit that supplies power to the non-contact power receiving unit.

Here, in order to hold the work tool with both hands and perform various operations in a stable state, the auxiliary handle is provided on the main body side in the work tool including the auxiliary handle that is attached to the main body in a detachable state. Power is supplied from the non-contact power supply unit, and it is detected that the auxiliary handle has been gripped by the user, and a grip detection signal is transmitted to the main body unit.
Here, the work tool includes, for example, a work tool such as an electric screwdriver, a grinder, a jigsaw, a chainsaw, etc., in which the tip tool is driven by electric power or air to perform various operations.

As a result, in a work tool that can detect and operate the grip of the auxiliary handle by the user, the electrical contacts of each other are exposed at the connection portion between the main body and the auxiliary handle when the auxiliary handle is not attached. Can be avoided. Therefore, it is possible to prevent short circuits, rust, and the like from occurring in the exposed contact portions.
As a result, in the configuration provided with the auxiliary handle, it can be used without being restricted by the usage environment.

The work tool according to the second invention is the work tool according to the first invention, which is provided on the main body and the auxiliary handle, respectively, and is aligned at the connecting portion between the main body and the auxiliary handle. It has more parts.
Here, the main body and the auxiliary handle are provided by the positioning portion so that the non-contact power feeding portion provided on the main body side and the non-contact power receiving portion provided on the auxiliary handle side are arranged so as to be close to each other. Align the connection part.

Here, the positioning portion includes, for example, a combination of a concave portion and a convex portion, a combination of a protrusion and a groove, and the like.
As a result, power can be efficiently supplied from the non-contact power feeding unit on the main body side to the non-contact power receiving unit on the auxiliary handle side.

The work tool according to the third invention is the work tool according to the second invention, and the alignment portion is composed of a convex portion and a concave portion protruding in a direction intersecting the mounting direction of the auxiliary handle with respect to the main body portion. It is a combination.
Here, the positioning portion provided at the connecting portion between the main body portion and the auxiliary handle is configured by a combination of a convex portion and a concave portion protruding in a direction intersecting the mounting direction.
Thereby, the positioning on the plane intersecting the mounting direction can be easily performed by fitting the convex portion and the concave portion protruding in the direction intersecting the mounting direction.

The work tool according to the fourth invention is a work tool according to any one of the first to third inventions, and further includes a lock portion for holding an auxiliary handle with respect to the main body portion.
Here, a lock portion is provided to hold the auxiliary handle so that it does not fall off from the main body when the auxiliary handle is attached to the main body.
As a result, the auxiliary handle is securely held in the main body, so that the detachable auxiliary handle can be prevented from falling off.

The work tool according to the fifth invention is a work tool according to any one of the first to fourth inventions, and the main body portion further includes an operation portion operated by the user. When the operation unit is operated, the control unit controls the drive unit according to the amount of operation of the operation unit.
Here, an operation unit such as a trigger switch that controls the drive unit according to the amount of operation operated by the user is provided in the main body unit.
As a result, the user can perform various operations while holding the auxiliary handle with one hand and the operation unit with the other hand.

The work tool according to the sixth invention is a work tool according to any one of the first to fifth inventions, and the auxiliary handle processes the grip detection signal received from the grip detection unit and sends it to the transmission unit. Further, it has a grip detection signal processing unit that transmits a processing signal.
Here, the grip detection signal processing unit provided on the auxiliary handle processes the grip detection signal transmitted from the auxiliary handle to the main body when the user detects the grip of the auxiliary handle to generate a processing signal.
Thereby, for example, the voltage value detected as the grip detection signal can be converted into a pulse signal (processed signal) and transmitted to the main body.

The work tool according to the seventh invention is the work tool according to the sixth invention, and the control unit determines whether or not to permit the operation of the drive unit based on the processing signal received by the reception unit. ..
Here, for example, whether or not to allow the operation of the drive unit is determined based on whether or not a processing signal (for example, a pulse signal) indicating that the user has grasped the auxiliary handle is received.
Thereby, for example, when the user does not hold the auxiliary handle, that is, when the processing signal is not received, the operation of the drive unit can be controlled so as not to be permitted.

The work tool according to the eighth invention is the work tool according to any one of the first to seventh inventions, and the transmitting unit on the auxiliary handle side is not in contact with the receiving unit on the main body side. Communicate.
Here, communication between the main body and the auxiliary handle is performed by non-contact communication.
As a result, various signals such as a grip detection signal can be transmitted and received in a non-contact manner between the auxiliary handle that can be attached to and detached from the main body and the main body.

The work tool according to the ninth invention is a work tool according to any one of the first to eighth inventions, and the grip detection unit is a pressure sensor.
Here, a pressure sensor is used as a grip detection unit that detects the grip of the auxiliary handle by the user and transmits a grip detection signal.
As a result, the strength (pushing pressure) of holding the auxiliary handle by the user is detected and transmitted to the main body side, so that, for example, according to the holding strength detected in the grip detection unit, the drive unit The output torque can be controlled.

The work tool according to the tenth invention is a work tool according to any one of the first to ninth inventions, and the drive unit is a motor for rotationally driving the tip tool.
Here, a motor driven by electric power is used as the drive unit.
Thereby, for example, the output torque of the drive unit can be electrically controlled according to the grip detection signal detected by the grip detection unit.

According to the work tool according to the present invention, it can be used in a configuration provided with an auxiliary handle without being restricted by the usage environment.

The whole perspective view which shows the structure of the power tool which concerns on one Embodiment of this invention. FIG. 3 is a perspective view showing a state in which the auxiliary handle of the power tool of FIG. 1 is removed from the main body. The control block diagram of the power tool of FIG. (A) and (b) are perspective views which show the arrangement structure of the pressure sensor provided in the auxiliary handle of FIG. (A) and (b) are cross-sectional views showing the connection structure between the auxiliary handle of FIG. 4 (a) and the main body portion. (A) and (b) are cross-sectional views showing the structure of the lock mechanism for holding the connection between the auxiliary handle of FIG. 2 and the main body portion. (A) and (b) are cross-sectional views showing the configuration of the unlocking mechanism for releasing the connection between the auxiliary handle of FIG. 2 and the main body. FIG. 5 is a flowchart showing a processing flow when detecting gripping of the auxiliary handle of the power tool of FIG. 1 and performing an operation. FIG. 5 is a flowchart showing a processing flow when the gripping detection signal of the flowchart of FIG. 8 is processed according to the detection level. (A)-(d) is a figure which shows the processing signal which processed the gripping detection signal detected by the processing in the flowchart of FIG. The flowchart which shows the process flow of the operation permission control based on the gripping value which gripped the auxiliary handle in the power tool of FIG. FIG. 5 is a flowchart showing a processing flow of update control of an operation permission threshold value based on a behavior detection signal detected by an acceleration sensor in the power tool of FIG. (A) to (c) are graphs for explaining the update control of the operation permission threshold value in FIG. The figure which shows the work mode set in the power tool of FIG. 1, the operation permission threshold value of FIG. The whole perspective view which shows the structure of the power tool provided with the other locking mechanism which concerns on other embodiment of this invention. FIG. 5 is a perspective view showing a state in which the auxiliary handle of the power tool of FIG. 15 is removed from the main body portion. (A) and (b) are cross-sectional views showing the structure of the lock mechanism for holding the connection between the auxiliary handle of FIG. 16 and the main body portion. (A) and (b) are cross-sectional views showing the configuration of the unlocking mechanism for releasing the connection between the auxiliary handle of FIG. 16 and the main body.

The power tool (working tool) 10 according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 14.
It should be noted that the contents described below merely show one embodiment of the present invention, and are not intended to limit the present invention by the configuration described in the present embodiment.
(1) Configuration of Power Tool 10 As shown in FIG. 1, the power tool 10 according to the present embodiment is attached to the tip portion by a brushless motor (drive unit 17) to which power is supplied from a battery (not shown). By rotating the tip tool 30 such as a driver and a drill, it is used for various operations such as screw tightening, screw loosening, and drilling.
As shown in FIGS. 1 and 2, the power tool 10 includes a main body portion 11 and an auxiliary handle 20 that is detachably attached to the main body portion 11.

(2) Configuration of Main Body 11 The main body 11 includes a drive unit 17 that is driven by being supplied with electric power from a built-in battery (not shown), and is attached to the tip portion in a detachable state. Various operations are performed while exchanging various tip tools 30.

As shown in FIG. 1, the main body portion 11 has a rotating portion 12 in which a tip tool 30 is attached to the tip portion and is rotationally driven by a driving portion 17 (see FIG. 3), and a main body that is gripped by the user's right hand during work. It includes a handle 13, an operation unit (trigger switch) 14 that drives the drive unit 17 (see FIG. 3) according to the amount of operation, and a connected unit 15 to which the auxiliary handle 20 is mounted. Further, as shown in FIG. 3, the main body 11 includes a control unit 16, a drive unit 17, a non-contact power feeding unit 18, and a signal receiving unit (reception unit) 19 inside.

As shown in FIG. 1, the rotating portion 12 is provided at the tip of the main body portion 11 to which the tip tool 30 is mounted. Then, the rotating unit 12 is rotationally driven by the driving unit 17 (see FIG. 3), so that various operations are performed according to the attached tip tool 30.
As shown in FIG. 1, the main handle 13 is a handle portion of the main body 11 extending downward from the lower surface, and is gripped by the user's right hand during work with the power tool 10 shown in FIG. NS.

As shown in FIG. 1, the operation unit (trigger switch) 14 is provided near the root portion of the main handle 13, and is operated by the index finger of the user's right hand holding the main handle 13 during work. Then, as shown in FIG. 3, the operation unit 14 transmits an operation signal according to the operation amount to the control unit 16. As a result, the control unit 16 drives the drive unit 17 so that the number of rotations corresponds to the amount of operation of the operation unit 14.

As shown in FIG. 2, the connected portion 15 is a substantially cylindrical portion provided on the left side surface of the main body portion 11, and the auxiliary handle 20 is attached to the connected portion 15. The connected portion 15 has a cylindrical portion 15a, a detachable button 15b, and an insertion hole 15c.
As shown in FIG. 2, the cylindrical portion 15a is arranged substantially perpendicular to the left side surface of the main body portion 11, and is attached to the inner peripheral surface side of the cylindrical portion with the auxiliary handle 20 inserted. Further, on the inner peripheral surface of the cylindrical portion 15a, a first recess (alignment portion) 15aa recessed outward in the radial direction and a second recess (alignment portion) 15ab are formed.

As shown in FIG. 2, the first concave portion 15aa is formed on the inner peripheral surface of the cylindrical portion 15a, and the first convex portion 23aa formed on the outer peripheral surface of the cylindrical portion 23 on the auxiliary handle 20 side is inserted. ..
As shown in FIG. 2, the second recess 15ab is formed at a position facing the first recess 15aa on the inner peripheral surface of the cylindrical portion 15a, and is formed on the outer peripheral surface of the cylindrical portion 23 on the auxiliary handle 20 side. The second convex portion 23ab is inserted.

Here, the first recess 15aa is formed so that the groove width (dimension in the direction intersecting the insertion direction) is smaller than that of the second recess 15ab.
As shown in FIG. 2, the detachable button 15b is arranged on the outer peripheral surface of the cylindrical portion 15a, and when the auxiliary handle 20 is pressed, the auxiliary handle 20 is shifted from the held state to the detachable state.

As shown in FIG. 2, the insertion hole 15c is a hole formed at substantially the center of the cylindrical portion 15a, and the insertion shaft 22a on the auxiliary handle 20 side is inserted.
As shown in FIG. 3, the control unit 16 is connected to the operation unit 14 and the signal reception unit 19. Then, the control unit 16 controls the rotation speed of the drive unit 17 based on the operation amount signal received from the operation unit 14. Further, the control unit 16 has a detection result (blur amount) in the acceleration sensor 28 received via the signal reception unit 19 and a grip detection signal (grip force) indicating that the user has gripped the grip portion 21 of the auxiliary handle 20. ), It is determined whether or not the operation of the drive unit 17 is permitted.

As shown in FIG. 3, the drive unit 17 is a motor driven by electric power, and applies a rotational drive force to the tip tool 30 (rotary unit 12).
As shown in FIG. 3, the non-contact power feeding unit 18 is supplied with electric power from a battery (not shown), and the main body 11 connects the non-contact power receiving unit 24 of the auxiliary handle 20 to the non-contact power receiving unit 24 without using electrical wiring or the like. Power is supplied in a non-contact state.
As shown in FIG. 3, the signal receiving unit (receiving unit) 19 receives the detection results of the pressure sensor 25 and the acceleration sensor 28 provided on the auxiliary handle 20 side via the signal transmitting unit 26 on the auxiliary handle 20 side. do.

(3) Configuration of Auxiliary Handle 20 The auxiliary handle 20 is provided in a stable state so that, for example, when the drive unit 17 performs a work of outputting a high torque rotational driving force, the work can be carried out. It is gripped by the user's left hand. Then, as shown in FIG. 1, the auxiliary handle 20 is attached to the connected portion 15 provided on the left side surface of the main body portion 11 in a detachable state.

The auxiliary handle 20 may be mounted not on the left side surface of the main body portion 11 shown in FIG. 1 but on the right side surface of the main body portion 11, or on another portion such as an upper portion or a lower portion.
As shown in FIG. 1, the auxiliary handle 20 includes a grip portion 21, a connecting portion 22, and a cylindrical portion 23. Further, as shown in FIG. 3, the auxiliary handle 20 contains a non-contact power receiving unit 24, a pressure sensor 25, a signal transmitting unit (transmitting unit) 26, a grip detection signal processing unit 27, and an acceleration sensor ( A behavior detection unit) 28 is provided.

As shown in FIG. 1, the grip portion 21 is a portion of the auxiliary handle 20 that is gripped by the left hand of the user, and is arranged so as to extend substantially perpendicular to the left side surface of the main body portion 11. ..
As shown in FIG. 2, the connecting portion 22 is a portion connected to the cylindrical portion 15a of the connected portion 15 of the main body portion 11 and has an insertion shaft 22a protruding toward the main body portion 11. There is.

The insertion shaft 22a is inserted into the insertion hole 15c provided at the center position of the cylindrical portion 15a of the main body portion 11.
As shown in FIG. 1, the cylindrical portion 23 is inserted into the inner peripheral surface side of the cylindrical portion 15a constituting the connected portion 15 of the main body portion 11. As a result, the auxiliary handle 20 is aligned with respect to the left side surface of the main body 11. A first convex portion (alignment portion) 23aa and a second convex portion (alignment portion) 23ab are formed on the outer peripheral surface of the cylindrical portion 23 so as to project inward in the radial direction.

As shown in FIG. 2, the first convex portion 23aa is formed on the outer peripheral surface of the cylindrical portion 23, and is inserted along the first concave portion 15aa formed on the inner peripheral surface of the cylindrical portion 15a on the main body portion 11 side. Will be done.
As shown in FIG. 2, the second convex portion 23ab is formed on the outer peripheral surface of the cylindrical portion 23 on the opposite side of the first convex portion 23aa, and is formed on the inner peripheral surface of the cylindrical portion 15a on the main body portion 11 side. It is inserted along the second recess 15ab.

Here, the first convex portion 23aa is formed so that the width (dimension in the direction intersecting the insertion direction) is smaller than that of the second convex portion 23ab.
As a result, the first convex portion 23aa and the second convex portion 23ab on the auxiliary handle 20 side are inserted along the first concave portion 15aa and the second concave portion 15ab on the main body portion 11 side, respectively. As a result, the auxiliary handle 20 can be positioned in the rotation direction about the insertion shaft 22a.

Further, since the widths of the first convex portion 23aa and the second convex portion 23ab (the first concave portion 15aa and the second concave portion 15ab) are different, the auxiliary handle 20 cannot be mounted even if it is rotated 180 degrees.
Therefore, the auxiliary handle 20 can be reliably positioned in the rotation direction about the insertion shaft 22a.

As shown in FIG. 3, the non-contact power receiving unit 24 is supplied with power from the non-contact power feeding unit 18 of the main body 11, and has other configurations (pressure sensor 25, signal transmitting unit 26, grip detection signal processing unit 27, acceleration). Power is supplied to the sensor 28). As a result, the auxiliary handle 20 is supplied with electric power from the main body 11 side, so that the auxiliary handle 20 can have a simple configuration without having a power source such as a battery inside.

As shown in FIG. 3, the pressure sensor 25 is provided inside the grip portion 21 gripped by the user in the auxiliary handle 20, and whether or not the user grips the grip portion 21 or the grip portion 21. Is detected with a gripping force and transmitted to the gripping detection signal processing unit 27.
Here, as the pressure sensor 25, as shown in FIG. 4A, a pressure sensor 25a arranged so as to extend along the longitudinal direction is used in the deep portion of the grip portion 21 of the auxiliary handle 20. As a result, when the grip portion 21 is gripped by the user, the pressure sensor 25 detects the grip and transmits a signal corresponding to the grip force to the grip detection signal processing unit.

As the pressure sensor 25, as shown in FIG. 4B, the pressure sensor 25b arranged at the root portion of the auxiliary handle 20 may be used.
As shown in FIG. 3, the signal transmission unit (transmission unit) 26 has a grip detection signal detected by the pressure sensor 25 and a behavior detection signal indicating the behavior (blur amount) of the auxiliary handle 20 detected by the acceleration sensor 28. Is transmitted to the signal receiving unit 19 of the main body unit 11.

As shown in FIG. 3, the grip detection signal processing unit 27 performs a process of converting the grip detection signal detected by the pressure sensor 25 into pulse signals different from each other according to the grip force (FIGS. 10A to 10A). (See FIG. 10 (d)).
The acceleration sensor (behavior detection unit) 28 is provided to detect the behavior of the auxiliary handle 20 (the amount of blurring that occurs during work), and as shown in FIG. 3, the detected amount of blurring is transmitted to the signal transmission unit 26. do. Further, as shown in FIGS. 4A and 4B, the acceleration sensor 28 is arranged at the end of the auxiliary handle 20.
As a result, the behavior (blur amount) of the auxiliary handle 20 generated during work can be effectively detected as compared with the configuration in which the acceleration sensor 28 is arranged near the center of the power tool 10 (near the connection portion). ..

<Connection structure between the main body 11 and the auxiliary handle 20>
The connection structure of the auxiliary handle 20 to the main body 11 of the power tool 10 of the present embodiment will be described below with reference to FIGS. 5 (a) and 5 (b).

In the configurations shown in FIGS. 5A and 5B, for convenience of explanation, the configuration on the main body 11 side shows only the connected portion 15, and the configurations other than the connected portion 15 are shown in the figure. It is omitted.
That is, in the present embodiment, as shown in FIG. 5A, the auxiliary handle 20 has the above-mentioned insertion shaft 22a on the auxiliary handle 20 side inserted into the insertion hole 15c on the main body 11 side, and has a cylindrical portion. The outer peripheral surface of the 23 is inserted in a state of being inserted into the inner peripheral surface side of the cylindrical portion 15a of the connected portion 15 of the main body portion 11.

At this time, due to the alignment effect of the above-mentioned alignment portions (first and second concave portions 15aa and 15ab and first and second convex portions 23aa and 23ab), the non-contact power feeding portion 18 provided on the main body portion 11 side As shown in FIG. 5B, the non-contact power receiving unit 24 on the auxiliary handle 20 side is arranged close to each other at positions facing each other.
Thereby, the power feeding efficiency from the non-contact power feeding unit 18 to the non-contact power receiving unit 24 can be improved.

Further, due to the alignment effect of the above-mentioned alignment portions (first and second concave portions 15aa and 15ab and first and second convex portions 23aa and 23ab), the signal receiving portion 19 provided on the main body portion 11 side and the auxiliary As shown in FIG. 5B, the signal transmission unit 26 on the handle 20 side is arranged close to each other at positions facing each other.
As a result, the signal transmission efficiency from the signal transmission unit 26 to the signal reception unit 19 can be improved.

<Lock mechanism for holding the main body 11 and the auxiliary handle 20>
In the power tool 10 of the present embodiment, as shown in FIGS. 6A and 6B, a locking portion (locking mechanism) 62b is provided at the tip of the insertion shaft 62a on the auxiliary handle 20 side. A locked portion (locking mechanism) 56c may be provided on the main body 11 side.
FIG. 6A shows the power tool 10 in a state immediately before the connecting portion 22 (cylindrical portion 23) on the auxiliary handle 20 side is connected to the connected portion 15 on the main body portion 11 side.

Here, the unlock button 56, which will be described later, is always urged by an elastic member 56b such as a spring toward the outside in the radial direction about the central axis of the cylindrical portion 15a, and is in a state where it can move along the radial direction. It is provided on the main body 11 side. An insertion hole 56a into which the insertion shaft 62a is inserted is provided below the unlock button 56.
From the state shown in FIG. 6A, when the connecting portion 22 of the auxiliary handle 20 is brought closer to the connected portion 15 of the main body portion 11, the locking portion 62b provided at the tip of the insertion shaft 62a is released. It is inserted along the insertion hole 56a of the unlock button 56 provided in the center of the cylindrical portion 15a of the main body portion 11.

At this time, the insertion shaft 62a has a locking portion 62b protruding inward in the radial direction at the tip portion thereof. The locking portion 62b has a tapered surface arranged obliquely with respect to the insertion direction at the tip portion thereof. Therefore, the insertion shaft 62a advances in the insertion hole 56a while pressing the insertion hole 56a (lock release button 56) inward in the radial direction (downward in the drawing), and is held at the position shown in FIG. 6B.

In the state shown in FIG. 6B, the locking portion 62b is inserted so that the rear end surface of the portion protruding in the direction intersecting the insertion direction is formed below the unlock button 56 provided on the main body portion 11 side. It is caught in the edge portion (locked portion 56c) of the hole 56a and is held.
As a result, the auxiliary handle 20 is held by the main body 11 so that it cannot be detached, so that the user can use the power tool 10 with the auxiliary handle 20 in a stable state.

On the other hand, when the auxiliary handle 20 attached to the main body 11 is disengaged, as shown in FIG. 7A, the lock is released so as to protrude outward in the radial direction from the outer peripheral surface of the cylindrical portion 15a of the main body 11. The button 56 may be pushed down inward in the radial direction.
At this time, when the unlock button 56 is pushed inward in the radial direction, the insertion hole 56a, which is a part of the unlock button 56, also moves inward in the radial direction.

As a result, the locked portion 56c provided at the edge portion of the insertion hole 56a also moves inward in the radial direction, so that the locked portion 62b is locked with the locking portion 62b provided at the tip of the insertion shaft 62a on the auxiliary handle 20 side. The locking relationship with the portion 56c is released.
As a result, as shown in FIG. 7B, the insertion shaft 62a of the auxiliary handle 20 can be pulled out from the insertion hole 56a of the main body 11, and the auxiliary handle 20 can be removed from the main body 11.

<Operation control of drive unit 17 in power tool 10>
The power tool 10 of the present embodiment has the above-mentioned configuration, and when the work is performed with the auxiliary handle 20 attached, the presence or absence of gripping of the auxiliary handle 20 is detected and controlled. The flow of such operation control processing will be described below using the flowcharts shown in FIGS. 8 and 9.

That is, in the power tool 10 of the present embodiment, as shown in FIG. 8, first, in step S11, the pressure sensor 25 on the auxiliary handle 20 side sends a grip detection signal indicating a state in which the grip portion 21 is gripped by the user. Wait until it is detected.
Then, when the grip detection signal is detected in step S11, the grip detection signal processing unit 27 on the auxiliary handle 20 side converts the grip detection signal from the voltage value into a pulsed level signal in step S12. The converted processed signal is output to the signal transmission unit 26.

Next, in step S13, the processing signal is transmitted from the signal transmitting unit 26 on the auxiliary handle 20 side to the signal receiving unit 19 on the main body 11 side.
Next, in step S14, the signal receiving unit 19 on the main body 11 side receives the processing signal from the signal transmitting unit 26 on the auxiliary handle 20 side and outputs it to the control unit 16.
Next, in step S15, the control unit 16 on the main body 11 side waits until a signal indicating an operation amount detected when the user operates the operation unit 14 is input.

Then, in step S15, when the input of the operation amount for operating the operation unit 14 is detected, it can be seen that the user has operated the operation unit 14 while holding the auxiliary handle 20.
Therefore, after detecting such a state indicating the gripping of the auxiliary handle 20 and the operation of the operation unit 14, the control unit 16 permits the operation of the drive unit 17 in step S16. As a result, the work using the power tool 10 with the auxiliary handle 20 can be performed in a stable state.

The grip detection signal detected in step S11 may be output as a different level signal depending on the magnitude of the force with which the user grips the grip portion 21 of the auxiliary handle 20.
In this case, the process is performed according to the flowchart shown in FIG. Note that the flowchart shown in FIG. 9 is different only in that step S12 in FIG. 8 is changed to steps S12a and 12b, and the processing in the other steps S is the same as in FIG.

That is, when the grip detection signal detected when the user grips the grip portion 21 of the auxiliary handle 20 is detected in step S11, the detection level (voltage value) of the grip detection signal is determined in step S12a.
Here, the detection level (voltage value) of the grip detection signal is determined in four stages of strong, medium, weak, and none.

Next, in step S12b, the grip detection signal processing unit 27 converts the grip detection signal into four types of processing signals according to the detection level of the grip detection signal determined in step S12a.
Specifically, the grip detection signal processing unit 27 converts the grip detection signal detected by the pressure sensor 25 into four types of processing signals shown in FIGS. 10A to 10D.

When the detection level of the grip detection signal is “strong”, the grip detection signal processing unit 27 converts the grip detection signal processing unit 27 into a pulse-shaped processing signal having the largest pulse width, as shown in FIG. 10A.
When the detection level of the grip detection signal is "medium", as shown in FIG. 10B, the grip detection signal processing unit 27 converts the pulse-shaped processing signal having a pulse width smaller than that of "strong". Convert.

When the detection level of the grip detection signal is "weak", as shown in FIG. 10 (c), the grip detection signal processing unit 27 converts the pulse-shaped processing signal having a pulse width smaller than that of "medium". Convert.
When the detection level of the grip detection signal is “none”, the grip detection signal processing unit 27 converts it into a pulse-shaped processing signal having the smallest pulse width, as shown in FIG. 10 (d).
As a result, the signal transmission unit 26 on the auxiliary handle 20 side transmits the processing signal in which the grip detection signal detected by the pressure sensor 25 is classified into four stages according to the magnitude of the grip force, so that the main body unit 11 The control unit 16 on the side can recognize how strong the user is gripping the auxiliary handle 20.

<Operation permission control of the drive unit 17 by the power tool 10>
In the power tool 10 of the present embodiment, the operation permission control of the drive unit 17 for performing the work in a more safe state with the auxiliary handle 20 attached is implemented. The operation permission control of the drive unit 17 will be described below using the flowcharts shown in FIGS. 11 and 12.

That is, in the power tool 10 of the present embodiment, as shown in FIG. 11, first, in step S21, does the control unit 16 on the main body 11 side have a preset mode of "low speed and high torque mode"? Judge whether or not.
Here, if the "low speed and high torque mode" is set, the process proceeds to step S22, and if it is not set, the process proceeds to step S26.

The "low speed and high torque mode" determined here is one of the modes set in advance in the control unit 16.
As shown in FIG. 14, the control unit 16 is provided with a "high-speed low-torque mode" that controls the drive unit so as to output a low torque at a high rotation speed, and a high torque at a rotation speed lower than that of the high-speed low-torque mode. A "low speed high torque mode" that controls the drive unit to output is set.

Further, as shown in FIG. 14, the control unit 16 is set to the control No. 16 in the "high-speed low torque mode" depending on the range of grip values that allow the operation of the drive unit 17. It is subdivided into 5 stages from H1 to H5. Similarly, in the "low speed and high torque mode", the control No. It is subdivided into three stages, L1 to L3.
The "low speed high torque mode" determined in step S21 is a mode in which a high torque is applied although the rotation speed applied by the drive unit 17 is relatively low, and torque is required more than the rotation speed. Selected during work. In this "low speed and high torque mode", a higher torque is output as compared with other modes, so that the user needs to perform the work while firmly holding the power tool 10. Therefore, in step S21, it is first determined whether or not the mode is "low speed and high torque mode".

Next, in step S22, since it is determined in step S21 that the mode is "low speed high torque mode", the control unit 16 calls a pre-registered low speed high torque control No. from a storage unit such as a memory (not shown).
Next, in step S23, it is determined whether or not the auxiliary handle 20 is attached to the main body 11. Here, if the auxiliary handle 20 is attached to the main body 11, the process proceeds to step S24. On the other hand, when the auxiliary handle 20 is not attached, it is determined that the conditions for carrying out the work of the "low speed and high torque mode" are not satisfied, the process proceeds to step S28, and the operation of the drive unit 17 is prohibited. End the process.

As a result, the work of the "low speed and high torque mode" can be surely performed in a state where the auxiliary handle 20 is attached to the main body 11, so that the safety can be improved.
Here, the presence / absence of the auxiliary handle 20 may be detected by whether or not the signal receiving unit 19 on the main body 11 side communicates with the signal transmitting unit 26 on the auxiliary handle 20 side. Alternatively, the presence or absence of the auxiliary handle 20 may be determined by using a sensor or the like that detects the attachment of the auxiliary handle 20.

Next, in step S24, the value (grip value) of the grip detection signal detected by the pressure sensor 25 on the auxiliary handle 20 side is within the range of the operation permission grip value corresponding to the control No. called in step S22. Judge whether or not.
Here, when the gripping value is within the range of the operation permitted gripping value, it is determined that the condition for carrying out the work of the "low speed and high torque mode" is satisfied, and the process proceeds to step S25, and the drive unit 17 Allow the operation and end the process.

On the other hand, when the gripping value is smaller than the range of the operation permitted gripping value, it is determined that the condition for carrying out the operation of the "low speed and high torque mode" is not satisfied, and the process proceeds to step S26.
Next, in step S26, it is determined in step S21 that the mode is not "low speed high torque mode", or in step S24, it is determined that the gripping value is smaller than the range of the operation permitted gripping value. Call the control No. of the "high-speed low-torque mode" whose usage conditions are looser than those of the "torque mode".

Next, in step S27, it is determined whether or not the gripping value is within the range of the operation permission gripping value corresponding to the control No. of the “high-speed low torque mode” called in step S26.
Here, when the gripping value is within the range of the operation permitted gripping value, it is determined that the condition for carrying out the work of the "high-speed low torque mode" is satisfied, and the process proceeds to step S25, and the drive unit 17 Allow the operation and end the process.

On the other hand, when the gripping value is smaller than the range of the operation permitted gripping value, it is determined that the condition for carrying out the work of the "high-speed low torque mode" is not satisfied, the process proceeds to step S28, and the operation of the drive unit 17 is performed. Is prohibited and the process ends.
As described above, the power tool 10 of the present embodiment detects the grip of the auxiliary handle 20 during work such as "low speed and high torque mode" in which highly safe work using the auxiliary handle 20 is required. , It is determined whether or not the magnitude of the gripping force (grip value) is within the range according to the set mode, and only when it is within the range, the operation of the drive unit 17 is permitted, so that the auxiliary handle More safe work can be performed by using the power tool 10 with 20.

Further, in the power tool 10 of the present embodiment, the operation permission control of the drive unit 17 is performed according to the gripping force for gripping the auxiliary handle 20 described above, and as shown in FIG. 12, the behavior (blur amount) of the power tool 10 is performed. ) Is detected, and if the amount of blur exceeds a predetermined range, control is performed so as to stop the operation of the drive unit 17.
Specifically, as shown in FIG. 12, first, in step S31, the control unit 16 on the main body 11 side of the grip portion 21 on the auxiliary handle 20 side passes through the signal transmission unit 26 and the signal reception unit 19. The behavior detection signal detected by the acceleration sensor 28 provided at the end is acquired.

As a result, the control unit 16 can recognize that the power tool 10 is shaken.
Next, in step S32, as shown in FIG. 13A, the behavior detection signal received from the acceleration sensor 28 receives two preset threshold values (for example, 60 sec) within a predetermined time during work (for example, 60 sec). Of the first and second behavior detection threshold values), it is determined whether or not the first behavior detection threshold value has been exceeded.

Here, as shown in FIG. 13A, when the behavior detection signal exceeds the preset first behavior detection threshold value, the process proceeds to step S33. On the other hand, if the behavior detection signal does not exceed the preset first behavior detection threshold value as shown in FIG. 13B, the process proceeds to step S27.
As shown in FIG. 14, the first behavior detection threshold is set for each control number of the preset mode. For example, the control No. of the high-speed low-torque mode. In the case of H1 to H5, the first behavior detection threshold is set to ^{20 m / s 2.} Then, the control No. of the low speed and high torque mode. In the case of L1 to L3, the first behavior detection threshold value is set to ^{18 m / s 2, which is smaller than the value of the high-speed low torque mode.}

Next, in step S33, since it was determined in step S32 that the first behavior detection threshold value was exceeded, the control unit 16 determined that the amount of blurring of the power tool 10 was large, and stopped the operation of the drive unit 17. Stop the work.
Next, in step S34, the control unit 16 acquires the magnitude (grip value) of the gripping force of the auxiliary handle 20 when the first behavior detection threshold is exceeded (when the amount of blurring is large) from the pressure sensor 25. do.

Next, in step S35, the control unit 16 collates the grip value acquired from the pressure sensor 25 with the range of the operation permission grip value of the control table for each control No. of the set work mode shown in FIG.
FIG. 14 shows a control table including a range of operation permission gripping values of the control table for each control No. of the set work mode.

For example, the control No. of the high-speed low-torque mode. In the case of H1 to H5, the range of the operation permission gripping value is set to 26 kg to 21 to 25 kg, 16 to 20 kg, 11 to 15 kg, and 0 to 10 kg. Then, the control No. of the low speed and high torque mode. In the case of L1 to L3, the range of the operation permission gripping value is set to 26 kg to 21 to 25 kg and 0 to 20 kg.

Next, in step S36, based on the collation result of step S35, the table is updated with the range of the operation permission gripping value changed to a larger range, and the process returns to step S31.
As a result, depending on the skill of the user, if the amount of blurring becomes large even within the range of the operation permission gripping value according to the control No. of each work mode, it is determined that the skill of the user is low and the drive is performed. As shown in FIG. 13 (c), the range of gripping values that allow the operation of the unit 17 can be changed to a larger range of values.

Therefore, by optimizing the range of the operation permission gripping value according to the skill of the user, the safety of the user can be ensured and appropriate control can be performed in consideration of the difference in skill of the user.
Further, in step S37, since it is determined in step S32 that the acquired behavior detection signal does not exceed the first behavior detection threshold value, the amount of blurring is considered to be relatively small. Therefore, in step S37, as shown in FIG. 13B, a second behavior detection threshold value smaller than the first behavior detection threshold value is set within a predetermined time (for example, 60 sec), and the acquired behavior detection signal is set. Determines whether or not exceeds the second behavior detection threshold.

As shown in FIG. 14, the second behavior detection threshold is set for each control number of the preset mode. For example, the control No. of the high-speed low-torque mode. In the case of H1 to H5, the second behavior detection threshold is set to 15 m / s ^{2, which is smaller than the first behavior detection threshold (20 m / s 2).} Then, the control No. of the low speed and high torque mode. In the case of L1 to L3, the second behavior detection threshold is set to 12 m / s ^{2, which} is smaller than the value of the high-speed low torque mode and smaller than the first behavior detection threshold (18 m / s ^2).

Here, if the behavior detection signal exceeds the second behavior detection threshold value, the process proceeds to step S38. On the other hand, when the behavior detection signal does not exceed the second behavior detection threshold value, it is determined that the power tool 10 has a small amount of blurring and is in a good working state, and the step is performed without stopping the operation of the drive unit 17. Return to S31.
Next, in step S38, since it is determined in step S37 that the second behavior detection threshold value has been exceeded, the control unit 16 turns on the processing flag.

Next, in step S39, whether or not the number of times the value of the detected behavior detection signal exceeds the second behavior detection threshold exceeds the predetermined number of times (for example, 5 times) within the predetermined time (for example, 60 sec). Is determined.
Here, if the value of the detected behavior detection signal exceeds a predetermined number of times (for example, 5 times) that exceeds the second behavior detection threshold value, the process proceeds to step S40. On the other hand, if the value of the detected behavior detection signal does not exceed the predetermined number of times (for example, 5 times) that exceeds the second behavior detection threshold value, the process proceeds to step S43.

Next, in step S40, since it was determined in step S39 that the value of the detected behavior detection signal exceeds a predetermined number of times (for example, 5 times) exceeding the second behavior detection threshold value, the first behavior Although a large amount of blurring that exceeds the detection threshold value has not occurred, the control unit 16 has a second behavior in consideration of the fact that blurring exceeding the second behavior detection threshold value has occurred many times within a predetermined time. The maximum value of the gripping force (grasping value) of the auxiliary handle 20 in the period exceeding the behavior detection threshold value is acquired from the pressure sensor 25.

Next, in step S41, the control unit 16 sets the maximum value of the grip value acquired from the pressure sensor 25 and the range of the operation permission grip value of the control table for each control No. of the set work mode shown in FIG. Match.
Next, in step S42, based on the collation result of step S41, as shown in FIG. 13C, the table is updated with the range of the operation permission gripping value changed to a larger range, and the process returns to step S31.

As a result, depending on the skill of the user, even if it is within the range of the operation permission gripping value according to the control No. of each work mode, if the blur exceeding the second behavior detection threshold value exceeds a predetermined number of times, it may occur. It is possible to change the range of the gripping value that allows the operation of the drive unit 17 to a larger value range by judging that the skill of the user is low.
Therefore, by optimizing the range of the operation permission gripping value according to the skill of the user, the safety of the user can be ensured and appropriate control can be performed in consideration of the difference in skill of the user.

Next, in step S43, since it was determined in step S39 that the value of the detected behavior detection signal did not exceed a predetermined number of times (for example, 5 times) exceeding the second behavior detection threshold value, the power tool 10 It is determined that the number of blurring is small and the working state is good, and the process proceeds to step S44 without stopping the operation of the drive unit 17.
Next, in step S44, the processing flag turned ON in step S38 is turned off, and the process returns to step S31.

In the power tool 10 of the present embodiment, as described above, when a blur amount exceeding the first behavior detection threshold value occurs during work using the power tool 10 with the auxiliary handle 20, the drive unit 17 is immediately used. As shown in FIG. 13 (c), the magnitude of the force for gripping the grip portion 21 of the auxiliary handle 20 (operation permission gripping value) set for stopping the operation and permitting the operation is larger. Change to a value.

As a result, when a blur amount exceeding the first behavior detection threshold value occurs, the drive of the drive unit 17 is stopped to ensure safety, and the drive unit 17 operates unless it is gripped with a stronger force. The table can be rewritten so that is not allowed.
Further, if the amount of blurring that does not exceed the first behavior detection threshold value but exceeds the second behavior detection threshold value occurs and occurs until the predetermined number of times is exceeded within a predetermined time, the drive of the drive unit 17 is stopped. In addition to ensuring safety, the table can be rewritten so that the operation of the drive unit 17 is not permitted unless it is gripped with a stronger force.

On the other hand, when the detected behavior detection signal does not exceed the first behavior detection threshold, or when a blur amount that does not exceed the first behavior detection threshold but exceeds the second behavior detection threshold occurs and within a predetermined time. If the number of times of blurring does not exceed the predetermined number of times, it is determined that the number of times of blurring of the power tool 10 is small and the working condition is good, and the operation of the drive unit 17 is not stopped and the work is continuously performed. Can be done.

[Other Embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.
(A)
In the above embodiment, an example in which the auxiliary handle 20 is held by the main body 11 of the power tool 10 by using the locking mechanism (locked portion 56c and locking portion 62b) shown in FIG. 6 has been described. However, the present invention is not limited to this.

For example, as shown in FIGS. 15 and 16, the power tool 110 may include an auxiliary handle 120 that is detachably attached to the main body 111.
The power tool 110 shown in FIGS. 15 to 18 has a different reference numeral for a member having a configuration different from that of the power tool 10 described in the above embodiment, and the same reference numeral for the same configuration as the power tool 10. The description will be omitted.

That is, as shown in FIGS. 15 and 16, the power tool 110 has a locking mechanism (groove 115c and locking portion 123a) different from the locking mechanism shown in FIG. 6 at the connecting portion between the main body portion 111 and the auxiliary handle 120. ) Is adopted.
Specifically, as shown in FIG. 16, an auxiliary handle is provided for three recesses (alignment portions) 115b formed along the circumferential direction of the cylindrical portion 115a of the connected portion 115 on the main body portion 111 side. Three locking portions (alignment portion, locking mechanism) 123a formed so as to project radially outward from the outer peripheral surface of the cylindrical portion 123 on the 120 side are inserted.

Here, it is preferable that the three recesses 115b and the three locking portions 123a have different dimensions in the circumferential direction. Thereby, when the auxiliary handle 120 is attached to the main body portion 111, the alignment in the rotation direction (the rotation direction about the axis of the cylindrical portion 23) can be performed.
Further, in the power tool 110, as shown in FIG. 17A, after the three locking portions 123a on the auxiliary handle 120 side are inserted into the three recesses 115b on the main body portion 111 side, the three engaging portions 123a are engaged. The auxiliary handle 120 is rotated clockwise so that the stop portion 123a fits into the groove portion (lock portion) 115c communicating with the three recesses 115b.

As a result, the three locking portions 123a are in a state of being fitted into the groove portions 115c. Further, as shown in FIG. 17B, a spring (unlocking mechanism) 132 arranged so as to be wound around the outer circumference of the cylindrical portion 115d provided near the central axis of the cylindrical portion 115a on the main body portion 111 side. As a result, the auxiliary handle 120 is given an urging force toward the detachment direction, so that the auxiliary handle 120 is held on the main body 111 side.

On the other hand, when the auxiliary handle 120 is detached from the main body 111, as shown in FIG. By operating the spring 132 so as to move toward the 11 side, the spring 132 arranged so as to be sandwiched between the main body 111 and the wall surface of the main body 111 shifts in the contracting direction.
In this state, by rotating the auxiliary handle 120 counterclockwise, the three locking portions 123a can be pulled out from the three recesses 115b.
As a result, the auxiliary handle 120 can be separated from the main body 111 side.

(B)
In the above embodiment, as shown in FIG. 14, an example in which a range of an operation permission threshold value and an operation permission gripping value are set for each control No. of each work mode (high-speed low torque, low-speed high torque) will be described. bottom. However, the present invention is not limited to this.

For example, the range of the operation permission threshold value and the operation permission gripping value set for each control No. of each work mode (high speed low torque, low speed high torque) is not limited to the values shown in FIG. 14, and the type of work tool and work Depending on the content and the like, a larger value or a smaller value may be appropriately set.
Similarly, the first and second behavior detection threshold values set for each control No. of each work mode (high-speed low torque, low-speed high torque) are not limited to the values shown in FIG. 14, and the type of work tool. , A larger value or a smaller value may be appropriately set depending on the work content and the like.

(C)
In the above embodiment, an example in which the acceleration sensor 28 for detecting the behavior of the power tool 10 during work is provided on the auxiliary handle 20 side has been described. However, the present invention is not limited to this.
For example, a behavior detection unit such as an acceleration sensor may be provided on the main body side.

Even in this case, the same effect as described above can be obtained by detecting the behavior (blur amount) of the power tool (work tool) during work by the behavior detection unit provided on the main body side.
Further, behavior detection units such as an acceleration sensor may be provided on the main body side and the auxiliary handle side, respectively.
Even if the behavior detection unit such as the acceleration sensor is provided on the main body side, it is preferable that the behavior detection unit is arranged at the end portion as much as possible. This makes it easier to detect the amount of blurring generated in the main body as compared with the configuration in which the behavior detection unit is provided near the center of the main body.

(D)
In the above embodiment, an example in which signals are transmitted and received between the main body 11 and the auxiliary handle 20 by non-contact communication has been described. However, the present invention is not limited to this.
For example, a method may be used in which signals are transmitted and received in a state where the communication between the main body and the auxiliary handle is in contact with each other.

(E)
In the above embodiment, an example in which the acceleration sensor 28 is used as the behavior detection unit for detecting the behavior of the power tool 10 during work has been described. However, the present invention is not limited to this.
For example, instead of the accelerometer, another sensor such as a gyro sensor may be used.

(F)
In the above embodiment, the power tool 10 in which the drive unit 17 is driven by the electric power supplied from a replaceable battery (not shown) has been described as an example. However, the present invention is not limited to this.
For example, it may be a power tool in which electric power is supplied to the drive unit via a power cable to drive the drive unit.

(G)
In the above embodiment, the power tool 10 in which the main handle 13 is gripped by the user's right hand and the auxiliary handle 20 is gripped by the left hand has been described as an example. However, the present invention is not limited to this.
For example, the power tool may be equipped with an auxiliary handle so that the main handle is gripped by the left hand of the user and the auxiliary handle is gripped by the right hand.

(H)
In the above embodiment, as an operation unit for driving the drive unit (motor) 17 of the electric tool 10, a trigger switch that adjusts the output torque of the drive unit (motor) 17 according to the pulling amount (operation amount) is used. The explanation was given with an example. However, the present invention is not limited to this.
For example, instead of the trigger switch, another switch such as an ON / OFF switch may be used.

(I)
In the above embodiment, the power tool 10 equipped with the motor driven by electric power has been described as an example. However, the present invention is not limited to this.
For example, the present invention may be applied to a work tool in which a drive unit is operated by air instead of electric power.

(J)
In the above embodiment, as a work tool according to the present invention, the present invention has been described as an example of applying the present invention to an electric tool 10 such as an electric screwdriver. However, the present invention is not limited to this.
For example, in addition to the electric screwdriver, the present invention may be applied to work tools that perform various operations such as grinders, jigsaws, and chainsaws.

Since the work tool of the present invention has an effect that it can be used without being restricted by the usage environment in a configuration provided with an auxiliary handle, it can be widely applied to various work tools.

10 Power tools (work tools)
11 Main body 12 Rotating part 13 Main handle 14 Operation part 15 Connected part 15a Cylindrical part 15aa First recess (alignment part)
15ab 2nd recess (alignment part)
15b Detachable button 15c Insertion hole 16 Control unit 17 Drive unit 18 Non-contact power supply unit 19 Signal receiving unit (receiving unit)
20 Auxiliary handle 21 Grip part 22 Connection part 22a Insertion shaft 23 Cylindrical part 23aa First convex part (alignment part)
23ab 2nd convex part (alignment part)
24 Non-contact power receiving unit 25 Pressure sensor (grasping detection unit)
25a, 25b pressure sensor (grasping detection unit)
26 Signal transmitter (transmitter)
27 Grip detection signal processing unit 28 Accelerometer (behavior detection unit)
30 Tip tool 56 Unlock button (unlock mechanism)
56a Insertion hole 56b Elastic member 56c Locked part (lock mechanism)
62a Insertion shaft 62b Locking part (locking mechanism)
110 Power tool (work tool)
111 Main body 115 Connected part 115a Cylindrical part 115b Recess (alignment part)
115c groove (lock mechanism)
115d Cylindrical part 120 Auxiliary handle 123 Cylindrical part 123a Locking part (alignment part, locking mechanism)
131 Unlocking part 132 Spring (Unlocking mechanism)

Claims (10)

It is a work tool that drives the attached tip tool to perform a predetermined work.
With the main body
An auxiliary handle that is attached to the main body in a detachable state and is gripped by the user during work.
With
The auxiliary handle
A grip detection unit that detects grip of the auxiliary handle by the user and transmits a grip detection signal.
A transmission unit that transmits the grip detection signal received from the grip detection unit, and a transmission unit.
A non-contact power receiving unit to which power is supplied from the main body side, and
Have and
The main body
The drive unit that drives the tip tool and
A receiving unit that receives the grip detection signal from the transmitting unit, and
A control unit that operates the drive unit based on the grip detection signal received by the reception unit, and a control unit that operates the drive unit.
A non-contact power supply unit that supplies power to the non-contact power receiving unit on the auxiliary handle side,
have,
Work tools. Each of the main body portion and the auxiliary handle is provided with an alignment portion for aligning the connection portion between the main body portion and the auxiliary handle.
The work tool according to claim 1. The alignment portion is a combination of a convex portion and a concave portion protruding in a direction intersecting the mounting direction of the auxiliary handle with respect to the main body portion.
The work tool according to claim 2. A lock portion for holding the auxiliary handle with respect to the main body portion is further provided.
The work tool according to any one of claims 1 to 3. The main body further includes an operation unit operated by the user.
When the operation unit is operated, the control unit controls the drive unit according to the amount of operation of the operation unit.
The work tool according to any one of claims 1 to 4. The auxiliary handle further includes a grip detection signal processing unit that processes the grip detection signal received from the grip detection unit and transmits the processing signal to the transmission unit.
The work tool according to any one of claims 1 to 5. The control unit determines whether or not to allow the operation of the drive unit based on the processing signal received by the reception unit.
The work tool according to claim 6. The transmitting unit on the auxiliary handle side performs non-contact communication with the receiving unit on the main body side.
The work tool according to any one of claims 1 to 7. The grip detection unit is a pressure sensor.
The work tool according to any one of claims 1 to 8. The drive unit is a motor that rotationally drives the tip tool.
The work tool according to any one of claims 1 to 9.

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