JP2023114188A - wall chaser - Google Patents

Abstract

To provide a wall chaser improved in convenience.SOLUTION: A wall chaser comprises: a motor; a battery mounting part; a first handle having a first gripping part; and a second handle having a second gripping part. The first gripping part is arranged closer to a first side than the second gripping part, where it is defined that: the first side is one side in a direction in which the wall chaser is moved in parallel with respect to a work-piece in performing grooving processing; and a second side is the other side. The battery mounting part is arranged so that, when a battery is mounted on the battery mounting part, the battery is at least partially positioned on the second side with respect to the first gripping part.SELECTED DRAWING: Figure 7

Description

The present invention relates to wall chasers.

Wall chasers for grooving walls, floors, ceilings, etc. have been known for some time. For example, the wall chaser disclosed in Patent Document 1 below includes a base for contacting a workpiece (wall, floor, ceiling, etc.), and a base disposed on one side of the base so as to be swingable with respect to the base. and a main body configured to: The main body includes a motor that provides rotational driving force to the cutting tool, a battery that supplies power to the motor, and two grips that are manually gripped by the user. With the base in contact with the workpiece and the motor rotating, when the user swings the main body in a direction approaching the base while holding the two grips with both hands, the cutting tool rotates. Project beyond the base. In this state, a groove is formed in the workpiece by parallelly moving the wall chaser in a direction orthogonal to the rotation axis of the cutting tool (also called a processing progress direction). The grooves thus formed are used, for example, for electrical wiring.

U.S. Patent Application Publication No. 2020/0164449

However, the wall chaser of Patent Document 1 leaves room for improvement. Specifically, as shown in FIG. 19, in this wall chaser 101, one gripping portion (main handle 102) extending substantially in the machining progress direction is positioned on the opposite side of the other gripping portion (auxiliary handle 103). A battery 104 is placed at the end. If the relatively heavy battery 104 is arranged at such a position, a large moment is generated due to the dead weight of the battery. Specifically, when the groove 17 is formed by moving the wall chaser 101 in the horizontal direction (the direction parallel to the side surface of the cutting tool 105) while the base 106 is in contact with the wall 108 extending in the vertical direction, , the battery 104 generates a large downward moment (indicated by the white arrow in the figure). This moment causes the wall chaser 101 to rotate clockwise, and there is a possibility that the groove 107 cannot be machined straight and bent. Therefore, the user needs to hold the wall chaser firmly with great force to resist this moment. For this reason, it is required to provide a wall chaser with improved convenience.

This specification discloses a wall chaser. This wall chaser includes a motor configured to provide a rotational driving force to a cutting tool about a rotation axis, a battery mounting section configured to detachably attach a battery for supplying power to the motor, a first A first handle having a grip portion and a second handle having a second grip portion. When one side of the movement direction, which is the direction in which the wall chaser is moved parallel to the workpiece during grooving, is defined as the first side, and the other side is defined as the second side, the first The gripping portion of may be arranged on the first side relative to the second gripping portion. The battery mounting portion may be arranged such that when the battery is mounted on the battery mounting portion, the battery is at least partially located on the second side relative to the first gripping portion.

According to the above configuration, the battery is arranged inside the device in the movement direction with respect to the first grip portion. For this reason, even when the wall chaser is horizontally moved in parallel with respect to the wall extending in the vertical direction to perform grooving, the generation of a downward moment due to the dead weight of the battery is suppressed. The hand holding the grip can easily support the first side portion of the wall chaser. Therefore, user convenience (operability) is improved.

FIG. 3B is a left side view of the wall chaser according to one embodiment, with the main body at top dead center; It is a right view of a wall chaser, and a main-body part is in a top dead center. It is a top view of a wall chaser. It is a right view of a wall chaser, and a main-body part is in a bottom dead center. Fig. 2 is a perspective view of the wall chaser with the battery removed and the main body at top dead center; Fig. 2 is a plan view of the wall chaser with the battery removed; Fig. 2 is a perspective view of the wall chaser seen from above, with the main body at top dead center; Fig. 2 is a perspective view of the wall chaser seen from above, with the main body at the bottom dead center; Figure 9 is a perspective view of the wall chaser seen from above, with the main body at top dead center and the first handle rotated 90 degrees to the left from the position shown in Figure 8; 9 is a perspective view of the wall chaser seen from above, with the main body at top dead center and the first handle rotated 90 degrees to the right from the position shown in FIG. 8; FIG. Fig. 2 is a perspective view of the wall chaser seen from below, with the main body at the bottom dead center; It is a cross-sectional view of a wall chaser. It is a vertical cross-sectional view of the wall chaser, and the main body is at the top dead center. It is a vertical cross-sectional view of the wall chaser, and the main body is at the bottom dead center. FIG. 4 is a vertical cross-sectional view of the wall chaser, with the operation member in the rotation-permitting position; FIG. 4 is a vertical cross-sectional view of the wall chaser, with the main body at the top dead center and the lock operation member at the lock position; FIG. 4 is a vertical cross-sectional view of the wall chaser, with the main body at the top dead center and the lock operation member at the unlocked position; Fig. 2 is a left side view of the wall chaser with some parts removed; It is a schematic diagram imitating the wall chaser of Patent Document 1 during grooving work.

Below, representative and non-limiting embodiments of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to provide those skilled in the art with details for implementing a preferred embodiment of the invention, and is not intended to limit the scope of the invention. Moreover, the additional features and inventions disclosed below can be used separately or in conjunction with other features and inventions to provide still improved apparatus, methods of making and using the same.

Moreover, any combination of features and steps disclosed in the following detailed description are not required to practice the invention in its broadest sense, but are specifically intended to illustrate representative embodiments of the invention only. is described. Moreover, various features of the representative embodiments described above and below, as well as those set forth in the independent and dependent claims, are described herein in providing additional and useful embodiments of the invention. They do not have to be combined in the exact order given or in the order listed.

All features described and/or claimed herein, apart from the configuration of the embodiments and/or claimed features, are subject to the original disclosure and claimed particular matter. As limitations, they are intended to be disclosed individually and independently of each other. Further, all statements in numerical ranges and groups or populations are intended as limitations on the original disclosure as well as the specific subject matter claimed and to disclose configurations intermediate thereto.

In one or more embodiments, the battery mounting portion is arranged such that the battery is at least partially located on the first side relative to the second gripping portion when the battery is mounted on the battery mounting portion. may be According to this configuration, the battery is arranged inside the device in the movement direction with respect to the second grip portion. Therefore, even when the wall chaser is horizontally moved in parallel with respect to the wall extending in the vertical direction to perform grooving, generation of a downward moment due to the dead weight of the battery is suppressed. Therefore, the user can easily support the second side portion of the wall chaser with the hand gripping the second grip.

In one or more embodiments, when the battery is attached to the battery attachment part, the battery attachment part is configured such that a virtual straight line connecting the center of the first grip and the center of the second grip and the battery and may be arranged so as to intersect. According to this configuration, the battery is positioned on a straight line connecting the position where the user grips the first grip with one hand and the position where the user grips the second grip with the other hand. Therefore, the generation of a downward moment due to the weight of the battery is further suppressed, and the user can more easily support the wall chaser. When the first gripping portion is configured to be rotatable about an axis parallel to the rotation axis of the cutting tool, the virtual straight line and the battery are aligned at all fixable rotational positions of the first gripping portion. may intersect, or the virtual straight line and the battery may intersect at a part of the fixable rotational position of the first grip. This point is the same when the second gripping portion is configured to be rotatable about an axis parallel to the rotation axis of the cutting tool.

In one or more embodiments, the battery mounting portion is such that when the battery is mounted on the battery mounting portion, the battery is generally positioned between the first gripping portion and the second gripping portion in the direction of movement. may be arranged to be located in According to this configuration, the position of the battery is the center between the position at which the user grips the first grip with one hand and the position at which the user grips the second grip with the other hand in the machining progress direction. (in other words, the center of gravity of the wall chaser is suppressed from biasing toward one side of the right hand and left hand supporting the wall chaser), so the user can support the wall chaser more stably. . In addition, the wall chaser can be made compact in the processing progress direction.

In one or more embodiments, the motor may comprise a motor shaft. The battery mounting portion may be arranged such that when the battery is mounted on the battery mounting portion, the battery and the motor shaft at least partially overlap when viewed in a direction orthogonal to the movement direction and the rotation axis. good. According to this configuration, the battery and the motor shaft are not aligned in a direction parallel to the rotation axis of the cutting tool. Therefore, the wall chaser can be made compact in the direction parallel to the rotation axis of the cutting tool.

In one or more embodiments, the battery mounting portion is inclined in a direction orthogonal to the movement direction and the rotation axis such that the front portion in the mounting direction of the battery is closer to the rotation axis than the rear portion. Also, the battery may be configured to be detachable in a sliding manner. According to this configuration, the user can easily attach the battery to the battery mounting portion using the weight of the battery.

In one or more embodiments, the first handle is configured to orient the first grip to extend non-parallel to the direction of travel and perpendicular to the axis of rotation. may be The second handle may be configured to orient the second grip to extend in a direction parallel to the axis of rotation. According to this configuration, when performing grooving on a ceiling or a floor (that is, a work piece extending in the horizontal direction), the left and right hands of the user gripping the first gripping portion and the second gripping portion are It becomes a comfortable posture and improves convenience. Also, it is easy to pick up the wall chaser by gripping the second grip.

In one or more embodiments, the first handle may be configured to enable the first gripping portion to be oriented to extend in a direction parallel to the axis of rotation. The second handle may be configured to orient the second grip to extend in a direction parallel to the axis of rotation. According to this configuration, when grooving a wall (that is, a work piece extending in the vertical direction), the left and right hands of the user gripping the first gripping portion and the second gripping portion are not forced. It becomes a posture that does not need to be used, and the convenience is improved. Also, the wall chaser can be easily lifted by gripping the first gripping portion and/or the second gripping portion.

In one or more embodiments, the first handle orients the first gripper at a first angle to extend in a direction non-parallel to the direction of travel and perpendicular to the axis of rotation. and a second angular position oriented to extend in a direction parallel to the axis of rotation, and the first gripping portion is configured to rotate between the first angular position and the second angular position. may be configured to be selectively lockable in any of the angular positions. According to this configuration, it is possible to orient the first grip part so that the user can easily use it, depending on the situation. For example, when grooving a ceiling or floor, the first grip is oriented at a first angular position, and when grooving a wall, the first grip is oriented at a second angle. It may be position oriented.

In one or more embodiments, the motor may be located on the first side of the axis of rotation. The battery mounting portion is configured so that the battery is at least partially positioned on the first side of the motor when the battery is mounted on the battery mounting portion, and the position of the battery in a direction parallel to the axis of rotation and the position of the battery parallel to the axis of rotation. may be arranged so that the position of the motor in each direction overlaps. With this configuration, the wall chaser can be made compact in the direction parallel to the rotation axis.

In one or more embodiments, the wall chaser may include a controller configured to control power delivery from the battery to the motor. The controller is arranged at a position adjacent to the motor in the direction of progress of machining, and at a position overlapping the battery when the battery is mounted in the battery mounting portion when viewed in a direction perpendicular to the movement direction and the rotation axis. may With this configuration, the distances between the battery and the controller and between the controller and the motor are reduced, so that electrical wiring for electrically connecting them can be simplified.

In one or more embodiments, a wall chaser may include a battery and a cutting tool.

The wall chaser 10 as an exemplary embodiment will be described in more detail below with reference to the drawings. The wall chaser 10 is an electric tool for grooving workpieces such as walls, floors, and ceilings. The wall chaser 10 described below is also referred to as a double-row grooving cutter, and can process two rows of grooves at the same time. As shown in FIGS. 1 and 2, the wall chaser 10 includes a base member 20 and a body portion 30. As shown in FIGS. The base member 20 has a substantially flat base 21 . The body portion 30 is arranged on one side of the base 21 . As shown in FIG. 11, the base 21 has a substantially rectangular shape. The surface of the base 21 opposite to the body portion 30 is formed flat and functions as a contact surface 23 for contacting a workpiece (floor, ceiling, wall, etc.).

As shown in FIG. 12, the main body 30 is configured to rotationally drive two substantially disc-shaped cutting tools 49 and 50 mounted on a spindle 45 about a rotation axis AX2. The cutting tools 49, 50 are also called diamond blades. The cutting tools 49 and 50 are arranged parallel to each other. In a state in which the contact surface 23 of the base member 20 is brought into contact with the workpiece, and the rotating cutting tools 49 and 50 protrude beyond the contact surface 23 to the opposite side of the main body 30 (see FIGS. 4 and 11). , parallel movement of the wall chaser 10 in a direction orthogonal to the direction in which the cutting tools 49 and 50 are arranged in parallel (in other words, the extending direction of the rotation axis AX2) and parallel to the contact surface 23, Grooving of the material progresses.

As a result, two linear grooves are formed on the workpiece at positions corresponding to the locus of movement of the cutting tools 49 and 50 . The portion between the two grooves is scraped off with any tool to finally form one large groove. An electrical wiring can be accommodated in the groove thus formed.

Hereinafter, for convenience of explanation, the direction in which the wall chaser 10 is translated with respect to the workpiece when performing grooving is defined as the front-rear direction of the wall chaser 10 . In the longitudinal direction, the side closer to the rotation axis AX2 of the cutting tools 49 and 50 is defined as the front side of the wall chaser 10, and the side farther from the rotation axis AX2 is defined as the rear side of the wall chaser 10. Further, in a direction orthogonal to the contact surface 23 (in other words, a direction orthogonal to the front-rear direction and the rotation axis AX2), the side on which the main body portion 30 is located is defined as the upper side of the wall chaser 10, and the opposite side is defined as the upper side of the wall chaser 10. Define the underside of the wall chaser 10 . Further, a direction orthogonal to the front-back direction and the up-down direction is defined as the left-right direction of the wall chaser 10 . The right side of the wall chaser 10 is defined as the right side of the wall chaser 10 when the front side is viewed from the rear side, and the opposite side is defined as the left side of the wall chaser 10 .

As shown in FIG. 2, the body portion 30 includes a gear housing 31, a motor housing 32, a rear housing 33, and a cover body . The gear housing 31, the motor housing 32, and the rear housing 33 are arranged in this order from the front side in the front-rear direction. As shown in FIG. 3 , the cover body 34 is positioned on the left side with respect to the gear housing 31 , motor housing 32 and rear housing 33 .

As shown in FIG. 12, the motor housing 32 accommodates an electric motor 41 (hereinafter simply referred to as the motor 41). The motor 41 includes a motor shaft 42 rotatably supported by bearings spaced apart in the front-rear direction. The motor shaft 42 is rotatable around a rotation axis AX1 extending in the front-rear direction. The motor 41 (motor shaft 42) provides the cutting tools 49 and 50 with rotational driving force about the rotation axis AX2.

As shown in FIG. 12, the gear housing 31 accommodates a gear mechanism for transmitting the rotational driving force of the motor shaft 42 to the cutting tools 49 and 50 . Specifically, the gear housing 31 accommodates a small bevel gear 43 , a large bevel gear 44 , and a spindle 45 . A small bevel gear 43 is fixed around the motor shaft 42 at the front end of the motor shaft 42 . The spindle 45 is rotatably supported about the rotation axis AX2 by bearings spaced apart in the left-right direction. The rotation axis AX2 intersects (more specifically, orthogonally) with the rotation axis AX1 of the motor shaft 42 . A large bevel gear 44 is fixed around the spindle 45 at the right end of the spindle 45 and meshes with the small bevel gear 43 .

The spindle 45 extends in the left-right direction within the gear housing 31 , extends from the gear housing 31 on the left side, and extends into the cover body 34 . An inner flange 46 is mounted around the spindle 45 within the cover body 34 . The inner flange 46 is a tubular member, and the right end thereof protrudes in a flange shape radially outward with respect to the rotation axis AX2. A male threaded portion is formed on the left side of the inner flange 46 of the spindle 45, and a lock nut 47 is attached to the male threaded portion. A cutting tool 49, at least one (five in the example of FIG. 12) annular spacers 48, and a cutting tool 50 are sandwiched between the right end of the inner flange 46 and the lock nut 47, and the lock nut 47 is tightened. Thereby, the positions of the cutting tools 49 and 50 with respect to the spindle 45 are fixed. By changing the number of spacers 48 arranged between the cutting tools 49 and 50, the separation distance between the cutting tools 49 and 50 can be adjusted.

With such a configuration, the rotational driving force of the motor 41 (motor shaft 42) is transmitted to the cutting tools 49 and 50. As shown in FIG. As shown in FIG. 5, an arrow 35 indicating the direction of rotation of the cutting tools 49 and 50 is attached to the left side of the cover body 34 .

As shown in FIGS. 1 and 2, the base member 20 includes an auxiliary cover portion 22 extending from the base 21 toward the side opposite to the contact surface 23 (in other words, the main body portion 30 side). The auxiliary cover portion 22 extends above the lower edge of the cover body 34 inside the cover body 34 .

As shown in FIG. 11, the base member 20 has an annular portion 25 at its rear end. The annular portion 25 is arranged above the base 21 . The body portion 30 also includes two annular portions 36 . The two annular portions 36 are arranged on both sides of the annular portion 25 in the left-right direction. A support shaft 26 extending in the left-right direction is arranged so as to pass through the annular portions 25 and 36 . The base member 20 and the body portion 30 are integrated via the support shaft 26 . Wheels 27 are attached to both ends of the support shaft 26 . When the wall chaser 10 is pressed against the workpiece and moved in parallel in the front-rear direction by the wheels 27 to perform grooving, the parallel movement is facilitated.

The body portion 30 is configured to be swingable with respect to the base member 20 about the support shaft 26 . The body portion 30 is always biased away from the base member 20 by a torsion spring (not shown) arranged to surround the support shaft 26 . Therefore, in the initial state, the body portion 30 is held at the position shown in FIGS. 1 and 2 . The position of the main body portion 30 at this time is also referred to as a top dead center. As shown in FIGS. 1 and 5, an arc-shaped through hole 37 is formed in the left portion of the cover body 34 . A protrusion 28 protrudes leftward from the outer surface of the left side portion of the auxiliary cover portion 22 so as to pass through the through hole 37 . Positioning the projection 28 at the lower end of the through hole 37 defines the position of the top dead center and prevents the lower edge of the cover body 34 from being displaced above the upper edge of the auxiliary cover portion 22 . be done. As shown in FIGS. 1 and 2, the cutting tools 49 and 50 are positioned above the base 21 when the main body 30 is at the top dead center. At this time, the auxiliary cover portion 22 of the base member 20 covers portions of the cutting tools 49 and 50 below the cover body 34 .

The position of the lower movement end of the main body 30 (lower movement limit position) for the swing motion of the main body 30 can be variably set by a cutting depth adjusting mechanism 38 (hereinafter simply referred to as the adjusting mechanism 38). . Specifically, as shown in FIGS. 1 and 2, the cutting depth adjusting mechanism 38 includes a bolt, a nut that screws onto the bolt, and an operating lever. The head of the bolt is located outside (right side) of the right side portion of the cover body 34, and an operation lever is attached around it. An arc-shaped through hole 39 is formed in the right portion of the cover body 34 . A bolt is arranged to pass through the through hole 39 . The nut is positioned inside (left side) of the right side portion of the cover body 34 . The user can move the adjustment mechanism 38 to any position along the arc shape of the through hole 39 by operating the operation lever to loosen the bolt. When the user tightens the adjustment mechanism 38, the bolt and nut tighten the right portion of the cover body 34 in the left-right direction. This fixes the adjustment mechanism 38 to the cover body 34 at that position.

The body portion 30 can be pushed down by the user until the bolt of the adjustment mechanism 38 abuts the upper edge 29 of the auxiliary cover portion 22 . That is, the position where the bolt of the adjusting mechanism 38 and the upper edge portion 29 of the auxiliary cover portion 22 abut becomes the position of the lower movement end of the main body portion 30 . The position of the body portion 30 when the body portion 30 is lowered to the bottom end in a state in which the position of the bottom end of the movement is set by the adjustment mechanism 38 to the lowermost side of the movable range is also referred to as the bottom dead center. be.

4, 8 and 11, when the main body portion 30 is at the bottom dead center (or when the main body portion 30 is at the lower movement end), the cutting tools 49 and 50 are inserted into the through holes 24 of the base 21 (see FIG. 11). ), it partially protrudes downward beyond the lower surface of the base 21 (contact surface 23). Such a mechanism allows the user to adjust the depth of cut by the cutting tools 49,50. When the user releases the force pushing down on the main body 30 in a state where the main body 30 is at the lower movement end, the main body 30 returns to the top dead center due to the biasing force of the torsion spring.

As shown in FIGS. 5 and 6 , the body portion 30 further includes a battery mounting portion 51 configured to allow attachment and detachment of a battery 54 for supplying electric power to the motor 41 . The battery mounting portion 51 is positioned above the rear housing 33 and formed integrally with the rear housing 33 . The battery mounting portion 51 is slidably attachable/detachable with the battery 54 directed from the rear side to the front side. Specifically, the battery mounting portion 51 includes a plurality of terminals 52 extending in a rail shape. When the battery 54 is mounted on the battery mounting portion 51 by sliding the battery 54 in the direction in which the terminals 52 extend, the terminals 52 and the terminals (not shown) of the battery 54 are electrically connected. Connected.

As shown in FIGS. 5 and 6 , the outer edge of the battery mounting portion 51 has a substantially U-shaped mounting surface 53 on which the battery 54 is mounted when the battery 54 is mounted on the battery mounting portion 51 . formed. As shown in FIGS. 1 and 2, in the present embodiment, the battery 54 has a front portion (front portion in the mounting direction) of the battery 54 that is closer to the contact surface than the rear portion of the battery 54 in the vertical direction. 23 (the rotation axis AX2 of the cutting tools 49 and 50), and is mounted on the battery mounting portion 51 in an inclined posture. Therefore, the sliding direction of the battery 54 (in other words, the terminal 52 and the mounting surface 53) is also oriented with the same inclination as this inclined attitude. According to such a configuration, the user can easily attach the battery 54 to the battery mounting portion 51 using the weight of the battery 54 . In addition, the distance between the battery 54 and the first handle 60, which will be described later, is greater during the attachment/detachment work of the battery 54 compared to the case where the battery 54 is slid in the horizontal direction (because they are less likely to interfere). , the attachment and detachment of the battery 54 becomes easier. However, the sliding direction and mounting posture of the battery 54 can be set arbitrarily.

As shown in FIG. 13, a controller 55 is housed inside the rear housing 33 . The controller 55 is electrically connected to the terminals 52 of the battery mounting portion 51 and the motor 41 and controls power supply from the battery 54 to the motor 41 . In this embodiment, the controller 55 includes a high temperature protection circuit, an overcurrent protection circuit, and an overdischarge protection circuit. However, one or two of these protection circuits may be omitted.

The controller 55 is arranged at a position adjacent to the motor 41 in the front-rear direction. Also, the controller 55 is arranged at a position overlapping the battery 54 when viewed in the vertical direction. With this arrangement, the distances between the battery 54 and the controller 55 and between the controller 55 and the motor 41 are reduced, so that electrical wiring for electrically connecting them can be simplified.

As shown in FIGS. 1 and 2, body portion 30 further includes a first handle 60 and a second handle 70 . The first handle 60 is positioned on the rear side of the rear housing 33 adjacent to the rear housing 33 . The first handle 60 is a so-called loop handle, and includes a first grip portion 61 to be gripped by a user's hand, a tubular base portion 63, and the first grip portion 61 and the base portion 63 arranged in a loop shape. and bridge portions 64 and 65 to be connected. On one side of the first gripping portion 61 in the direction in which the first gripping portion 61 extends (in the vicinity of the connecting portion between the first gripping portion 61 and the bridge portion 64), there is provided an operation for starting and stopping the motor 41. An operation member 62 is attached for performing

As shown in FIG. 13, the first grip portion 61 accommodates a switch 56 for sending control signals for starting and stopping the motor 41 to the controller 55 . When the user pulls the operating member 62 rearward, the operating member 62 presses the actuator of the switch 56 , and the switch 56 is turned on to start the electric motor 41 . When the user releases the pull operation, the pressing state by the operating member 62 is released, and the switch 56 is turned off to stop the electric motor 41 .

In this embodiment, the first handle 60 is attached to the rear end of the rear housing 33 so as to be rotatable about a rotation axis parallel to the rotation axis AX1 of the motor shaft 42 . Specifically, as shown in FIG. 13, two concave portions 33a extending in the circumferential direction are formed in the cylindrical rear end portion of the rear housing 33 . A cylindrical base portion 63 of the first handle 60 is formed with two protrusions 63a extending in the circumferential direction. The two protrusions 63a are fitted in the two recesses 33a. Therefore, the base portion 63 (and thus the first handle 60) is attached to the rear end portion of the rear housing 33 in a retaining state and is rotatable about a rotation axis parallel to the rotation axis AX1.

In this embodiment, the first handle 60 is configured to be selectively lockable in one of three different angular positions (rotational positions) shown in FIGS. 7, 9 and 10, respectively. Specifically, as shown in FIGS. 13 and 14 , an operating member 66 is arranged near the proximal end (front end) of the bridge portion 64 of the first handle 60 . The operation member 66 is sandwiched by the base portion 63 on both sides thereof, and movement in the circumferential direction about the rotation axis of the first handle 60 is restricted. Further, the operation member 66 is held by the base portion 63 and the rear housing 33 so as to be movable in the front-rear direction.

The operating member 66 includes an operating portion 67 projecting radially outward and an engaging portion 68 projecting forward. A concave portion 33 b that fits the engaging portion 68 is formed in the upper portion of the rear housing 33 . A coil spring 69 is arranged in a compressed state between the rear surface of the operating portion 67 and the front end surface of the base portion 63 . The operating portion 67 (and thus the operating member 66 ) is always urged forward by the urging force of the coil spring 69 . Therefore, in the initial state, as shown in FIGS. 13 and 14, the engaging portion 68 is accommodated within the recess 33b. As a result, the circumferential movement of the operation member 66 and thus of the first handle 60 is restricted.

When the user places a finger on the front surface of the operating portion 67 and pulls it rearward, the operating member 66 moves rearward against the biasing force of the coil spring 69 . As a result, as shown in FIG. 15, the engaging portion 68 of the operating member 66 moves to the outside of the recess 33b, and the engaging state between the engaging portion 68 and the recess 33b is released. Therefore, circumferential movement of the operation member 66 and the first handle 60 is allowed. At this time, the rear end portion of the operating member 66 is accommodated in the recess formed in the front end surface of the base portion 63 .

Although not shown, the rear housing 33 has a recess having the same shape as the recess 33b at a position rotated 90 degrees to the left about the rotation axis of the first handle 60 with respect to the recess 33b, and at the first position. It is also formed at a position rotated 90 degrees to the right about the rotation axis of the handle 60 . When the first handle 60 is at the angular position shown in FIG. 7, the first handle 60 is rotated 90 degrees to the left while pulling the operating portion 67, and then the pulling operation of the operating portion 67 is released. The member 66 returns forward due to the biasing force of the coil spring 69 . As a result, the engaging portion 68 enters the recess of the rear housing 33 . As a result, the circumferential movement of the first handle 60 is restricted, and the angular position of the first handle 60 (first grip portion 61) is fixed at the position shown in FIG. When the first handle 60 is in the position shown in FIG. 9, the user can easily pull the operation member 62 with the index finger by gripping the first grip portion 61 with the left hand.

Although detailed description is omitted, similarly, when the first handle 60 is at the angular position shown in FIG. When the pulling operation of the operating portion 67 is released, the angular position of the first handle 60 (first grip portion 61) is fixed at the position shown in FIG. When the first handle 60 is in the position shown in FIG. 10, the user can easily pull the operation member 62 with the index finger by gripping the first grip portion 61 with the right hand.

When the first handle 60 is in the position shown in FIGS. 1, 2 and 8, the first gripping portion 61 extends in a direction non-parallel to the front-rear direction and orthogonal to the rotation axis AX2. More specifically, as shown in FIGS. 1 and 2, when the body portion 30 is at the top dead center, the first grip portion 61 is moved in a direction orthogonal to the front-rear direction and the rotation axis AX2 (that is, vertically). As shown in FIG. 8, when the main body portion 30 is at the bottom dead center, the first gripping portion 61 is perpendicular to the rotation axis AX2, and the lower end portion of the first gripping portion 61 is located behind the upper end portion. extending in a direction angled to lie to the side. When the first handle 60 is in the position shown in FIG. 9 or 10, the first gripping portion 61 is positioned along the axis of rotation regardless of whether the main body portion 30 is at the top dead center or the bottom dead center. It extends in the horizontal direction parallel to AX2.

As shown in FIGS. 1 and 2 , the second handle 70 is positioned forward of the first handle 60 . More specifically, the second handle 70 is attached to the top of the cover body 34 near the front end of the cover body 34 . As shown in FIG. 5, the second handle 70 is a so-called loop handle, and includes a second grip portion 71 for the user to grip by hand, base portions 72 and 73, and bridge portions 74 and 75. I have. The base portions 72 and 73 are arranged on both sides of the annular portion 34a in the left-right direction. The annular portion 34 a is a portion formed integrally with the cover body 34 so as to protrude upward from the cover body 34 . The bridge portions 74 and 75 connect the base portions 72 and 73 and the second grip portion 71 so that a gap is formed between the base portions 72 and 73 and the second grip portion 71 .

In this embodiment, the second handle 70 is configured to be rotatable about a rotation axis parallel to the rotation axis AX2 of the cutting tools 49,50. Specifically, as shown in FIG. 16, a support shaft 76 extending parallel to the second grip portion 71 passes through the base portions 72 and 73 and the annular portion 34a in the left-right direction. With this configuration, the second handle 70 is rotatably supported by a support shaft 76 supported by the annular portion 34a.

A hexagonal nut 77 is attached to the left end of the support shaft 76 so as to be screwed with a male screw formed at the tip of the support shaft 76 . The hexagonal nut 77 is housed inside the base portion 72 in a non-rotating state. A knob 79 is attached to the right end of the support shaft 76 . The knob 79 is located on the right side of the base portion 73 . When the user loosens the knob 79 , the second handle 70 is rotatable around the support shaft 76 . When the user tightens the knob 79 when the second handle 70 is at the desired rotational position, the hexagonal nut 77 and the knob 79 tighten the bases 72, 73 and the annular portion 34a in the left-right direction. The rotational position of handle 70 is fixed. With such a configuration, the user can rotationally change the fixed position of the second grip portion 71 . Each of the base portions 72, 73, and the annular portion 34a has a plurality of uneven shapes along the circumferential direction. can be fixed at any position where they mesh with each other. As shown in FIGS. 7 and 8, the second grip portion 71 extends in the horizontal direction parallel to the rotation axis AX2 regardless of whether the body portion 30 is at the top dead center or the bottom dead center. do.

The wall chaser 10 described above can be used as follows. The user first grips the first grip portion 61 with one hand and grips the second grip portion 71 with the other hand. The user then positions the wall chaser 10 so that the contact surface 23 contacts the workpiece. Next, the user pulls the operation member 62 with the fingers of the hand that grips the first handle 60 to activate the motor 41 . Next, the user applies force to the hand holding the second handle 70 to press the main body part 30 toward the base 21 to displace the main body part 30 from the top dead center to the bottom dead center. Then, the user translates the wall chaser 10 in the front-rear direction to perform grooving. In the present embodiment, the direction in which the wall chaser 10 advances the grooving (hereinafter also referred to as the machining advancing direction) is the direction from the front side to the rear side. However, the wall chaser 10 may be designed so that the processing progress direction is the direction from the rear side to the front side. Alternatively, the wall chaser 10 (for example, the shape of the cutting tools 49 and 50) is designed so that the user can select the processing progress direction from the direction from the front side to the back side and from the direction from the back side to the front side according to the situation. may be designed.

Such an operation may be performed by gripping the first grip portion 61 with the right hand and the second handle 70 with the left hand, or vice versa. For example, when there are vertically extending walls on the front and left sides of the user, the user grips the first grip portion 61 with the right hand and the second grip portion 71 with the left hand. By moving the wall chaser 10 in parallel from near the left wall in a direction away from the left wall, a groove can be formed from near the left wall to the front wall. Conversely, when there are vertically extending walls on the front and right sides of the user, the user grips the first grip portion 61 with the left hand and the second grip portion 71 with the right hand. If the wall chaser 10 is translated away from the right wall from the vicinity of the right wall, a groove can be formed from the vicinity of the right wall to the front wall.

In the wall chaser 10 described above, the battery 54 is positioned on the front side of the first grip portion 61 as a whole. Therefore, even when the contact surface 23 is brought into contact with the wall extending in the vertical direction and the grooving process is performed in the horizontal direction, generation of a downward moment due to the dead weight of the battery 54 is suppressed. The rear portion of the wall chaser 10 can be easily supported by the hand gripping the grip portion 61 of 1. Also, the battery 54 is positioned on the rear side of the second grip portion 71 as a whole. Therefore, for the same reason, the front portion of the wall chaser 10 can be easily supported by the hand holding the second grip portion 71 . Such an effect is obtained when the battery 54 is partially positioned forward of the first grip portion 61 and/or when the battery 54 is partially positioned rearward of the second grip portion 71. Even if you do, you can still get it to some extent.

Also, since the battery 54 is generally positioned between the first handle 60 and the second handle 70, the position of the battery 54 in the front-to-rear direction can be easily adjusted with one hand by the user. The center between the position where the grip portion 61 is gripped and the position where the second grip portion 71 is gripped with the other hand is approached. In other words, the center of gravity of wall chaser 10 is prevented from biasing toward one of the left and right hands supporting wall chaser 10 . Therefore, the user can support the wall chaser 10 more stably. Moreover, the wall chaser 10 can be made compact in the front-rear direction.

Further, as shown in FIGS. 4 and 7 to 10, an imaginary straight line L1 connecting the center C1 of the first grip portion 61 and the center C2 of the second grip portion 71 and the battery 54 are three-dimensionally intersect. Therefore, the battery 54 is positioned on a straight line connecting the position where the user grips the first grip portion 61 with one hand and the position where the user grips the second grip portion 71 with the other hand. . Therefore, the generation of a downward moment due to the weight of the battery 54 is further suppressed, and the user can more easily support the wall chaser 10 . The centers C1 and C2 mean three-dimensional central positions.

Further, as shown in FIGS. 12 to 15, the battery 54 and the motor shaft 42 partially overlap when viewed in the vertical direction. In other words, the battery 54 and the motor shaft 42 are not aligned in the left-right direction. Therefore, the wall chaser 10 can be made compact in the horizontal direction. Further, the motor 41 is positioned on the rear side of the rotation axis AX2 of the cutting tools 49 and 50 . Also, the battery 54 is partially located behind the motor 41 and arranged so that the position of the battery 54 in the left-right direction and the position of the motor 41 in the left-right direction overlap. This arrangement also allows the wall chaser 10 to be made compact in the horizontal direction.

In addition, since the first handle 60 is rotatable around the rotation axis extending in the front-rear direction, the first grip 61 can be oriented so that the user can easily use it according to the situation. For example, when grooving a ceiling or floor, if the first gripping portion 61 is oriented in the angular position shown in FIG. The left and right hands are in a comfortable posture, improving convenience. Alternatively, when grooving a wall, the first gripping portion 61 could be oriented in the angular position shown in FIG. 9 or 10 to achieve the same effect.

The wall chaser 10 described above has a function of locking the main body 30 at the top dead center. Such functions are described below. As shown in FIG. 11, the wall chaser 10 has a lock operation member 81. As shown in FIG. The lock operation member 81 is arranged adjacent to the second grip portion 71 . Specifically, the lock operation member 81 is arranged such that its longitudinal direction is parallel to the extending direction of the second grip portion 71 . As shown in FIGS. 11 and 16 , the lock operation member 81 has one lateral edge portion accommodated inside the second grip portion 71 and rotates parallel to the second grip portion 71 . It is supported by the second grip portion 71 so as to be rotatable about an axis (rotational axis extending in the left-right direction). Most of the lock operation member 81 is exposed outside the second grip portion 71 (on the side of the base portions 73 and 74).

The lock operation member 81 has a lock position (see FIG. 16) for locking the main body 30 at the top dead center and an unlock position (see FIG. 17) for allowing displacement of the main body 30 from the top dead center to the bottom dead center. ) and can be displaced (rotated) by manual operation. In the initial state, the lock operation member 81 is biased to the lock position by the first link lever 83 biased by the compression spring 87 . When the user grips the second grip portion 71, the lock operation member 81 is rotated from the lock position to the unlock position by gripping the lock operation member 81 together. As shown in FIG. 17, the lock operation member 81 has a projection 82 projecting radially outward with respect to its rotation axis.

As shown in FIG. 16, the wall chaser 10 further includes a first link lever 83. As shown in FIG. The first link lever 83 has a first end portion 84 and a second end portion 86, and has a substantially L-shaped shape bent at a curved portion. A portion of the first link lever 83 closer to the first end 84 than the curved portion is accommodated in the second grip portion 71 . A portion of the first link lever 83 closer to the second end 86 than the curved portion is accommodated in the bridge portion 75 .

Column-shaped protrusions 85 are formed on the front and rear sides, respectively, at approximately the center of the portion closer to the second end portion 86 than the curved portion. The first link lever 83 can tilt between the position shown in FIG. 16 and the position shown in FIG. A compression spring 87 is arranged between the first end 84 and the inner surface of the second grip 71 . The compression spring 87 always biases the first end 84 toward the lock operation member 81 . Therefore, in the initial state, the first link lever 83 is held at the position shown in FIG. A through hole extending in the left-right direction is formed in the second end portion 86 , and the support shaft 76 passes through the second end portion 86 via this through hole.

As shown in FIG. 16, the wall chaser 10 further comprises a first sleeve 88 and a second sleeve 89. As shown in FIG. The first sleeve 88 and the second sleeve 89 are cylindrical members extending in the left-right direction. The first sleeve 88 and the second sleeve 89 are arranged coaxially with the support shaft 76 so that the support shaft 76 penetrates therethrough, and are displaceable in the left-right direction along the support shaft 76 . A first sleeve 88 is received within the base 73 to the left of and adjacent the second end 86 of the first link lever 83 . A second sleeve 89 is housed within the annular portion 34 a so as to be adjacent to the first sleeve 88 on the left side of the first sleeve 88 . If two separate sleeves (first sleeve 88 and second sleeve 89) are used, the first sleeve 88 is attached to the second handle 70 (base 73) and the cover body 34 (annulus 34a) is attached. ), the second handle 70 and the cover body 34 can be easily assembled.

As shown in FIGS. 16 and 18, the wall chaser 10 further includes a second link lever 90. As shown in FIGS. The second link lever 90 has a first end portion 91 and a second end portion 92 (see FIG. 18), and has a shape bent at a curved portion. The second link lever 90 is housed in the cover body 34 so as to be tiltable. The second link lever 90 has cylindrical projections 95 on the front and rear near the center. The second link lever 90 is tiltable with the point of contact between the protrusion 95 and the inner surface of the cover main body 34 as a fulcrum. A through-hole is formed in the first end portion 91 in the left-right direction, and the support shaft 76 passes through the first end portion 91 via this through-hole. This first end 91 is adjacent to the second sleeve 89 on the left side of the second sleeve 89 .

A compression spring 94 is arranged between the annular portion 34 a and the first end portion 91 . A compression spring 94 always biases the first end 91 toward the right side. Therefore, in the initial state, the second link lever 90 is held at the position shown in FIG. In addition, due to the biasing force of the compression spring 94 , the first end 91 is always in contact (engagement) with the second sleeve 89 in the left-right direction.

As shown in FIG. 16, the second end 92 is formed with an engaging portion 93 projecting leftward. 16 in which the lock operation member 81 is at the lock position, the engaging portion 93 protrudes inward from the right side portion of the cover body 34 through a through hole (not shown) of the cover body 34. As shown in FIG. At this time, the upper edge portion 29 of the auxiliary cover portion 22 is positioned below the engaging portion 93 . Therefore, in the state of FIG. 16 where the lock operation member 81 is in the lock position, the user applies downward force to the second handle 70 to displace the main body 30 from the top dead center toward the bottom dead center. However, since the engaging portion 93 engages (contacts) with the upper edge portion 29, such displacement is prevented.

On the other hand, when the user grips the lock operation member 81 and rotates the lock operation member 81 from the lock position (FIG. 16) to the unlock position (FIG. 17), the projection of the lock operation member 81 as shown in FIG. 82 presses the first end 84 of the first link lever 83 away from the lock operation member 81 . Thereby, the first link lever 83 is tilted against the biasing force of the compression spring 87 . This causes the second end 86 of the first link lever 83 to push the first sleeve 88 to the left. As a result, the first sleeve 88 and the second sleeve 89 move toward the left. Thus, the first link lever 83 rotates the lock operation member 81 from the locked position to the unlocked position in a direction parallel to the support shaft 76 of the first sleeve 88 and the second sleeve 89 . to the displacement of .

As the first sleeve 88 and the second sleeve 89 move leftward, the first end 91 of the second link lever 90 is pushed leftward by the second sleeve 89 . As a result, the second link lever 90 moves the first end 91 to the left against the biasing force of the compression spring 94 and moves to the second end 92 (and thus to the second end 92). The formed engaging portion 93) tilts to move to the right. Thus, the second link lever 90 converts the displacement of the first sleeve 88 and the second sleeve 89 in a direction parallel to the support shaft 76 into displacement (tilting) in a direction different from the displacement. As a result, the engaging portion 93 is retracted to a position where it does not interfere (engage) with the upper edge portion 29 . Therefore, displacement of the body portion 30 from the top dead center to the bottom dead center is allowed. When the body portion 30 is at a position other than the top dead center, the protrusion 93 abuts the right side surface of the auxiliary cover portion 22 when the gripping of the lock operation member 81 is stopped. When the body portion 30 is swung up and down, the tip of the projection 93 slides on the surface of the right side surface of the auxiliary cover portion 22 . When the body portion 30 is returned to the top dead center, the protrusion 93 reaches above the upper edge portion 29 and is automatically locked by the bias of the compression spring 94 .

According to the above-described configuration, the first link lever 83, the first sleeve 88, the second sleeve 89, and the second link lever 90 function as a link mechanism interlocking with the lock operation member 81. The engagement relationship between the engagement portion 93 and the upper edge portion 29 of the auxiliary cover portion 22 is changed according to the displacement of the cover portion 81 . Therefore, the top dead center lock function can be suitably realized in the arrangement in which the second grip portion 71 of the rotary second handle 70 and the lock operation member 81 are adjacent to each other.

In order to realize the top dead center locking function in the arrangement in which the second grip portion 71 of the rotary second handle 70 and the lock operation member 81 are adjacent to each other, the rotary motion of the second handle 70 is affected. The problem is how to transmit the displacement force of the lock operation member 81 to the engaging portion 93 without causing any damage. In the embodiment described above, such a problem is solved by using the first sleeve 88 and the second sleeve 89 that are displaceable in the direction parallel to the support shaft 76 as part of the link mechanism. Moreover, since the first sleeve 88 and the second sleeve 89 are arranged coaxially with the support shaft 76 so that the support shaft 76 penetrates, the structure of the second handle 70 and its surroundings can be made compact.

Also, the first link lever 83 can change the acting direction of the displacement force of the lock operation member 81 and transmit it to the first sleeve 88 and the second sleeve 89 . Therefore, the operation direction of the lock operation member 81 can be set in a direction that is easy for the user to grip. Further, the second link lever 90 can change the acting direction of the displacement force of the first sleeve 88 and the second sleeve 89 and transmit it to the engaging portion 93 . Therefore, the displacement direction of the engaging portion 93 can be set in a direction suitable for top dead center locking. In other words, the degree of freedom in designing for top dead center locking is improved.

Also, since the first link lever 83 is accommodated in the second handle 70, the structure of the second handle 70 and its surroundings can be made compact. Since the second link lever 90 is accommodated in the cover main body 34, the structure of the main body 30 and its periphery can be made compact.

Further, the support shaft 76 passes through the first end 91 of the second link lever 90 , and the first end 91 of the second link lever 90 is connected between the second sleeve 89 and the support shaft 76 . It engages the second sleeve 89 by axial contact. Therefore, the second sleeve 89 and the second link lever 90 can be easily interlocked with each other while the second link lever 90 is supported by the support shaft 76 with a simple structure.

Further, when the lock operation member 81 is in the lock position, the engaging portion 93 engages with the upper edge portion 29 of the auxiliary cover portion 22 extending upward from the base 21, and the main body portion 30 is moved from the top dead center. Prevents displacement to bottom dead center. Therefore, the extension distance of the second link lever 90 can be shortened compared to the configuration in which the base 21 and the engaging portion 93 are engaged with each other. Therefore, the link mechanism can be simplified and lightened. However, the engaging portion 93 may engage with the base 21 or any portion fixed to the base 21 .

Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and do not limit the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention includes equivalents thereof. In addition, any combination or omission of each element described in the claims and specification within the range that at least part of the above problems can be solved or at least part of the effect is achieved It is possible.

For example, instead of the first handle 60 and the second handle 70, handles of any aspect (eg, shape, orientation of gripping portion, etc.) may be employed. For example, instead of the first handle 60, a handle having the same structure as the second handle 70 may be employed. Alternatively, a handle with a fixed position of the grip may be employed.

Alternatively, the lock operation member 81 is not limited to a rotary type, and may be deformed into any form displaced in any direction. For example, instead of the rotary lock operation member 81, a slide operation member that displaces in the left-right direction may be employed.

Alternatively, the above-described various interlocking operations between a plurality of members may be achieved by any mechanical configuration capable of achieving similar functions without being limited to the configuration described above. For example, instead of first sleeve 88 and second sleeve 89, a post extending parallel to spindle 76 non-coaxially with spindle 76 (outside second handle 70 and annulus 34a). A member may be arranged to be displaced parallel to the support shaft 76 in conjunction with the lock operation member 81 . In this case, the columnar member may be solid or hollow. Further, the outer diameter of the columnar member may be cylindrical or prismatic. Also, the first link lever 83 and the second link lever 90 may be changed to any shape and arrangement so as to interlock with the columnar member.

Alternatively, instead of the cutting tools 49 and 50 (cutting tools for forming two rows of grooves), three or more cutting tools (cutting tools for forming three or more rows of grooves) may be used. Alternatively, a single cutting tool having two or more rows of cutting portions may be used.

Alternatively, base member 20 may be omitted. In this case, the configuration for swinging the body portion 30 with respect to the base member 20 is also omitted.

Correspondence between each component of the above embodiment and each component of the present invention is shown below. However, each component of the embodiment is merely an example, and does not limit each component of the present invention. Wall chaser 10 is an example of a "wall chaser." The rear side of wall chaser 10 is an example of a "first side." The front side of wall chaser 10 is an example of a "second side." The cutting tools 49 and 50 are examples of "cutting tools". The rotation axis AX2 is an example of the "rotation axis". The motor 41 is an example of a "motor". The battery mounting portion 51 is an example of a "motor mounting portion". Battery 54 is an example of a "battery." The first handle 60 is an example of a "first handle." The 1st grip part 61 is an example of a "1st grip part." The second handle 70 is an example of a "second handle." The second grip portion 71 is an example of a "second grip portion". Motor shaft 42 is an example of a "motor shaft." Controller 55 is an example of a "controller." Note that the rear side of the wall chaser 10 can be regarded as the "second side", and the front side of the wall chaser 10 can be regarded as the "first side". In this case, the first handle 60 is an example of the "second handle", and the second handle 70 is an example of the "first handle".

DESCRIPTION OF SYMBOLS 10... Wall chaser 20... Base member 21... Base 22... Auxiliary cover part 23... Contact surface 24... Through hole 25... Annular part 26... Support shaft 27 ...Wheel 28...Protrusion 29...Upper edge 30...Main body 31...Gear housing 32...Motor housing 33...Rear housing 33a...Recess 33b...Recess 34... Cover body 34a... Annular part 35... Arrow 36... Annular part 37... Through hole 38... Cutting depth adjusting mechanism 39... Through hole 41... Electric motor 42...Motor shaft 43...Small bevel gear 44...Large bevel gear 45...Spindle 46...Inner flange 47...Lock nut 48...Spacer 49, 50...Cutting tool 51.. Battery mounting part 52... Terminal 53... Mounting surface 54... Battery 55... Controller 56... Switch 60... First handle 61... First grip part 62. ..Operating member 63...Base 63a...Convex part 64...Bridge part 66...Operating member 67...Operating part 68...Engaging part 69...Coil spring 70...Second 2 handle 71... second grip part 72, 73... base part 74, 75... bridge part 76... support shaft 77... hexagonal nut 79... knob 81... lock operation Member 82...Protrusion 83...First link lever 84...First end 85...Protrusion 86...Second end 87...Compression spring 88...First sleeve 89...second sleeve 90...second link lever 91...first end 92...second end 93...engaging portion 94...compression spring 95...Protrusions C1, C2, C3...Center L1...Imaginary straight line AX1...Rotational axis AX2...Rotational axis

Claims (12)

being a wall chaser,
a motor configured to provide a rotational drive force to the cutting tool about the axis of rotation;
a battery loading unit configured to allow attachment and detachment of a battery for supplying electric power to the motor;
a first handle having a first grip;
a second handle having a second grip;
When one side of the movement direction, which is the direction in which the wall chaser is moved parallel to the workpiece when performing grooving, is defined as the first side, and the other side is defined as the second side, the above The first gripping portion is arranged on the first side relative to the second gripping portion,
The battery mounting portion is arranged such that when the battery is mounted on the battery mounting portion, the battery is at least partially located on the second side relative to the first grip portion. . The wall chaser of claim 1,
The battery mounting portion is arranged such that when the battery is mounted on the battery mounting portion, the battery is at least partially located on the first side relative to the second grip portion. . The wall chaser according to claim 1 or claim 2,
The battery mounting portion is configured such that when the battery is mounted on the battery mounting portion, an imaginary straight line connecting the center of the first grip portion and the center of the second grip portion intersects with the battery. Wall chaser placed in. The wall chaser according to any one of claims 1 to 3,
When the battery is mounted on the battery mounting portion, the battery is positioned entirely between the first gripping portion and the second gripping portion in the moving direction. Arranged like a wall chaser. The wall chaser according to any one of claims 1 to 4,
the motor comprises a motor shaft;
In the battery mounting portion, when the battery is mounted in the battery mounting portion, the battery and the motor shaft at least partially overlap when viewed in a direction orthogonal to the movement direction and the rotation axis. A wall chaser arranged to do so. The wall chaser according to any one of claims 1 to 5,
The battery mounting portion holds the battery in an inclined posture in a direction orthogonal to the movement direction and the rotation axis such that a front portion in a mounting direction of the battery is closer to the rotation axis than a rear portion. A wall chaser configured to be detachable in a sliding manner. The wall chaser according to any one of claims 1 to 6,
The first handle is configured to be able to orient the first gripping portion so as to extend in a direction non-parallel to the movement direction and perpendicular to the rotation axis,
The wall chaser, wherein the second handle is configured to orient the second grip so as to extend in a direction parallel to the axis of rotation. The wall chaser according to any one of claims 1 to 7,
the first handle is configured to orient the first grip to extend in a direction parallel to the axis of rotation;
The wall chaser, wherein the second handle is configured to orient the second grip so as to extend in a direction parallel to the axis of rotation. The wall chaser according to claim 8, which includes claim 7 as a dependent source,
said first handle having a first angular position orienting said first gripping portion to extend in a direction non-parallel to said direction of movement and perpendicular to said axis of rotation; and a second angular position oriented to extend in a direction parallel to the . A wall chaser configured to be selectively lockable in any of its positions. The wall chaser according to any one of claims 1 to 9,
The motor is located on the first side of the rotation axis,
When the battery is mounted on the battery mounting portion, the battery mounting portion is configured to:
said battery being at least partially located on said first side relative to said motor;
A wall chaser arranged so that the position of the battery in the direction parallel to the axis of rotation and the position of the motor in the direction parallel to the axis of rotation overlap. A wall chaser according to claim 10,
a controller configured to control the supply of power from the battery to the motor;
The controller is positioned adjacent to the motor in the machining progress direction, and is positioned so that when the battery is mounted in the battery mounting portion, the battery is positioned in a direction orthogonal to the movement direction and the rotation axis. Wall chaser placed in a position overlapping with. The wall chaser according to any one of claims 1 to 11,
A wall chaser comprising the battery and the cutting tool.

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