Wall chaser

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

Technical Field

[0004] , , , , , ,

[0001] The present invention relates to a wall chaser.

Background Art

[0002] Wall chasers for grooving walls, floors, ceilings, etc. have been conventionally known. For example, the wall chaser disclosed in Patent Document 1 below includes a base for abutting against a workpiece (such as a wall, floor, ceiling, etc.), and a main body portion disposed on one side of the base and configured to be swingable with respect to the base. The main body portion includes a motor that provides a rotational driving force to a cutting tool, a battery for supplying power to the motor, and two gripping portions for a user to grip by hand. When the base is abutted against the workpiece and the motor is rotated, and the user swings the main body portion in a direction approaching the base while gripping the two gripping portions with both hands, the rotating cutting tool protrudes beyond the base. In this state, a groove is formed in the workpiece by translating the wall chaser in a direction orthogonal to the rotation axis of the cutting tool (also referred to as the machining progress direction). The groove thus formed is used, for example, for electrical wiring. [[ID=~]]

Prior Art Documents

Patent Documents

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the wall chaser described in Patent Document 1 still has room for improvement. Specifically, as shown in Figure 19, in this wall chaser 101, the battery 104 is located at the end of one gripping part (main handle 102) that extends roughly in the direction of machining, opposite to the other gripping part (auxiliary handle 103). When a relatively heavy battery 104 is placed in such a position, the weight of the battery generates a large moment during machining. Specifically, when forming a groove 17 by moving the wall chaser 101 horizontally (parallel to the side of the cutting tool 105) while the base 106 is in contact with a wall 108 that extends vertically, a large downward moment (shown by a white arrow in the figure) is generated by the battery 104. This moment causes the wall chaser 101 to rotate in a clockwise direction, and there was a possibility that the groove 107 would not be machined in a straight line but would be curved. Therefore, users need to firmly hold the wall chaser with considerable force to resist this moment. For this reason, there is a need to provide a wall chaser that offers enhanced convenience. [Means for solving the problem]

[0005] This specification discloses a wall chaser. The wall chaser may include a motor configured to provide a rotational driving force to a cutting tool about a rotation axis, a battery mounting section configured to detachably house a battery for supplying power to the motor, a first handle having a first gripping section, and a second handle having a second gripping section. When performing grooving, if one side of the direction of movement, which is the direction in which the wall chaser is moved parallel to the workpiece, is defined as the first side and the other side as the second side, the first gripping section may be positioned on the first side than the second gripping section. The battery mounting section may be positioned such that when a battery is mounted in the battery mounting section, the battery is at least partially located on the second side than the first gripping section.

[0006] According to the above configuration, the battery is positioned inside the device in the direction of movement relative to the first gripping part. Therefore, even when performing groove cutting by moving the wall chaser horizontally in parallel with respect to a wall extending vertically, the generation of a downward moment due to the weight of the battery is suppressed, and the first side of the wall chaser can be easily supported by the hand gripping the first gripping part. Thus, user convenience (operability) is improved. [Brief explanation of the drawing]

[0007] [Figure 1] This is a left side view of a wall chaser according to one embodiment, with the main body at top dead center. [Figure 2] This is a right-side view of the Wall Chaser, with the main body at top dead center. [Figure 3] This is a floor plan of the Wall Chaser. [Figure 4] This is a right-side view of the Wall Chaser, with the main body at the bottom dead center. [Figure 5] This is a perspective view of the wall chaser with the battery removed, and the main unit is at top dead center. [Figure 6] This is a plan view of the Wall Chaser with the battery removed. [Figure 7] This is a perspective view of the Wall Chaser from above, with the main body at top dead center. [Figure 8] This is a perspective view of the Wall Chaser from above, with the main body at the bottom dead center. [Figure 9] This is a perspective view of the wall chaser 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. [Figure 10] This is a perspective view of the wall chaser 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 Figure 8. [Figure 11] This is a perspective view of the Wall Chaser from below, with the main body at the bottom dead center. [Figure 12] This is a cross-sectional view of the Wall Chaser. [Figure 13] This is a vertical cross-sectional view of the wall chaser, with the main body at top dead center. [Figure 14] This is a vertical cross-section of the wall chaser, with the main body at the bottom dead center. [Figure 15] This is a vertical cross-sectional view of the wall chaser, with the operating member in a position where rotation is permitted. [Figure 16] This is a vertical cross-sectional view of the wall chaser, with the main body at top dead center and the locking mechanism in the locked position. [Figure 17] This is a vertical cross-sectional view of the wall chaser, with the main body at top dead center and the locking mechanism in the unlocked position. [Figure 18] This is a left side view of the Wall Chaser with some parts removed. [Figure 19] This is a schematic diagram of a wall chaser from Patent Document 1 during groove machining. [Modes for carrying out the invention]

[0008] Representative and non-limiting examples of the present invention will be described in detail below with reference to the drawings. This detailed description is intended simply to show those skilled in the art details for carrying out preferred examples of the present invention and is not intended to limit the scope of the invention. In addition, the additional features and inventions disclosed below may be used separately from or in conjunction with the other features and inventions to provide further improved apparatus, methods for manufacturing and using the same.

[0009] Furthermore, the combinations of features and processes disclosed in the following detailed description are not essential for carrying out the present invention in the broadest sense, and are described solely to illustrate representative examples of the present invention. Moreover, the various features of the representative examples described above and below, as well as the various features described in the independent and dependent claims, do not necessarily have to be combined in the same way as the examples described herein or in the order listed, in order to provide additional and useful embodiments of the present invention.

[0010] All features described in this specification and / or the claims are intended to be disclosed individually and independently of each other, as limitations to the initial disclosure and the claimed subject matter, apart from the configuration of the features described in the embodiments and / or the claims. Furthermore, all descriptions of numerical ranges and groups or collections are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the claimed subject matter.

[0011] In one or more embodiments, the battery mounting portion may be arranged such that when a battery is mounted on the battery mounting portion, the battery is at least partially located on the first side relative to the second gripping portion. According to this configuration, the battery is arranged inside the device in the moving direction relative to the second gripping portion. Therefore, even when grooving is performed by translating the wall chaser horizontally with respect to a wall extending in the vertical direction, the generation of a downward moment due to the weight of the battery is suppressed. Thus, the user can easily support the portion on the second side of the wall chaser with the hand holding the second gripping portion.

[0012] In one or more embodiments, the battery mounting portion may be arranged such that when a battery is mounted on the battery mounting portion, a virtual straight line connecting the center of the first gripping portion and the center of the second gripping portion intersects the battery. According to this configuration, the battery will be positioned on a straight line connecting the position where the user grips the first gripping portion with one hand and the position where the user grips the second gripping portion with the other hand. Therefore, the generation of a downward moment due to the weight of the battery is more 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 may intersect at all rotatable positions where the first gripping portion can be fixed, or the virtual straight line and the battery may intersect at some of the rotatable positions where the first gripping portion can be fixed. This also applies to the case where the second gripping portion is configured to be rotatable about an axis parallel to the rotation axis of the cutting tool.

[0013] In one or more embodiments, the battery mounting portion may be arranged such that when a battery is mounted on the battery mounting portion, the battery is entirely positioned between the first gripping portion and the second gripping portion in the moving direction. According to this configuration, in the machining progress direction, the position of the battery approaches the center between the position where the user grips the first gripping portion with one hand and the position where the user grips the second gripping portion with the other hand (in other words, the center of gravity of the wall chaser is prevented from being biased to one side of the right and left hands supporting the wall chaser), so the user can more stably support the wall chaser. Also, the wall chaser can be made more compact in the machining progress direction.

[0014] In one or more embodiments, the motor may include a motor shaft. The battery mounting section may be arranged such that, when the battery is mounted in the battery mounting section, the battery and the motor shaft at least partially overlap when viewed in a direction perpendicular to the direction of movement and the axis of rotation. With this configuration, the battery and the motor shaft are not aligned in a direction parallel to the axis of rotation of the cutting tool. Therefore, the wall chaser can be made more compact in a direction parallel to the axis of rotation of the cutting tool.

[0015] In one or more embodiments, the battery mounting section may be configured to allow the battery to be attached and detached in a sliding manner, with the battery mounted in a tilted position such that the front portion of the battery mounting direction is closer to the axis of rotation than the rear portion, in a direction perpendicular to the direction of movement and the axis of rotation. With this configuration, the user can easily attach the battery to the battery mounting section using the battery's own weight.

[0016] In one or more embodiments, the first handle may be configured to orient the first gripping portion so that it extends in a direction non-parallel to the direction of movement and perpendicular to the axis of rotation. The second handle may be configured to orient the second gripping portion so that it extends in a direction parallel to the axis of rotation. This configuration improves convenience when performing groove cutting on ceilings or floors (i.e., workpieces extending horizontally), as the user's left and right hands gripping the first and second gripping portions can be in a comfortable position. It also makes it easier to lift the wall chaser by gripping the second gripping portion.

[0017] In one or more embodiments, the first handle may be configured to orient the first gripping portion so that it extends in a direction parallel to the axis of rotation. The second handle may be configured to orient the second gripping portion so that it extends in a direction parallel to the axis of rotation. This configuration improves convenience when grooving a wall (i.e., a workpiece extending vertically), as the user's left and right hands gripping the first and second gripping portions can be in a comfortable position. It also makes it easier to lift the wall chaser by gripping the first and / or second gripping portions.

[0018] In one or more embodiments, the first handle may be configured to be rotatable between a first angular position in which the first gripping portion is oriented to extend in a direction non-parallel to the direction of movement and perpendicular to the axis of rotation, and a second angular position in which the gripping portion is oriented to extend in a direction parallel to the axis of rotation, and the first gripping portion may be configured to be selectively fixed in either the first or second angular position. With this configuration, the first gripping portion can be oriented in a way that is easy for the user to use, depending on the situation. For example, when grooving a ceiling or floor, the first gripping portion may be oriented to the first angular position, and when grooving a wall, the first gripping portion may be oriented to the second angular position.

[0019] In one or more embodiments, the motor may be located on a first side of the axis of rotation. The battery mounting section may be arranged such that, when the battery is mounted in the battery mounting section, the battery is at least partially located on the first side of the motor, and the position of the battery in the direction parallel to the axis of rotation overlaps with the position of the motor in the direction parallel to the axis of rotation. This configuration allows the wall chaser to be made more compact in the direction parallel to the axis of rotation.

[0020] In one or more embodiments, the wall chaser may include a controller configured to control the supply of power from the battery to the motor. The controller may be positioned adjacent to the motor in the direction of machining, and overlapping with the battery when the battery is mounted in the battery mounting section, in a direction perpendicular to the direction of movement and the axis of rotation. This configuration reduces the distance between the battery and the controller, and between the controller and the motor, thus simplifying the electrical wiring for electrically connecting them.

[0021] In one or more embodiments, the wall chaser may include a battery and a cutting tool.

[0022] The following describes in more detail a wall chaser 10 as an exemplary embodiment with reference to the drawings. The wall chaser 10 is an electric tool for cutting grooves in workpieces such as walls, floors, and ceilings. The wall chaser 10 described below is also called a double-row groove cutter and can cut two rows of grooves simultaneously. As shown in Figures 1 and 2, the wall chaser 10 comprises a base member 20 and a main body 30. The base member 20 has a substantially flat base 21. The main body 30 is positioned on one side of the base 21. As shown in Figure 11, the base 21 has a substantially rectangular shape. The surface of the base 21 opposite the main body 30 is formed flat and functions as a contact surface 23 for contacting the workpiece (floor, ceiling, wall, etc.).

[0023] As shown in Figure 12, the main body 30 is configured to rotate two substantially disc-shaped cutting tools 49 and 50 mounted on the spindle 45 around the rotation axis AX2. The cutting tools 49 and 50 are also called diamond blades. The cutting tools 49 and 50 are arranged to be parallel to each other. When 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 Figures 4 and 11), the wall chaser 10 is moved in a direction perpendicular to the direction in which the cutting tools 49 and 50 are aligned in parallel (in other words, the direction in which the rotation axis AX2 extends) and parallel to the contact surface 23, grooving of the workpiece is carried out.

[0024] This creates two linear grooves on the workpiece at positions corresponding to the movement paths of the cutting tools 49 and 50. The portion between these two grooves is then removed by any tool, ultimately forming one large groove. Electrical wiring can be accommodated in this groove.

[0025] For the sake of explanation, in the following, the direction in which the wall chaser 10 is moved parallel to the workpiece during grooving is defined as the front-to-back direction of the wall chaser 10. Within the front-to-back 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 further from the rotation axis AX2 is defined as the rear side of the wall chaser 10. In addition, in the direction perpendicular to the contact surface 23 (in other words, the direction perpendicular to the front-to-back direction and the rotation axis AX2), the side where the main body 30 is located is defined as the upper side of the wall chaser 10, and the opposite side is defined as the lower side of the wall chaser 10. Furthermore, the direction perpendicular to the front-to-back direction and the up-and-down direction is defined as the left-to-right direction of the wall chaser 10. Within the left-to-right direction, the right side when viewed from the rear to the front is defined as the right side of the wall chaser 10, and the opposite side is defined as the left side of the wall chaser 10.

[0026] As shown in Figure 2, the main body 30 comprises a gear housing 31, a motor housing 32, a rear housing 33, and a cover body 34. The gear housing 31, motor housing 32, and rear housing 33 are arranged in this order from the front in the front-to-back direction. As shown in Figure 3, the cover body 34 is located to the left of the gear housing 31, motor housing 32, and rear housing 33.

[0027] As shown in Figure 12, an electric motor 41 (hereinafter simply referred to as motor 41) is housed inside the motor housing 32. The motor 41 includes a motor shaft 42 that is rotatably supported by bearings spaced apart in the front-rear direction. The motor shaft 42 is rotatable about a rotation axis AX1 that extends in the front-rear direction. The motor 41 (motor shaft 42) provides rotational driving force to the cutting tools 49 and 50 about the rotation axis AX2.

[0028] As shown in Figure 12, the gear housing 31 houses 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 houses a small bevel gear 43, a large bevel gear 44, and a spindle 45. The small bevel gear 43 is fixed around the motor shaft 42 at its front end. The spindle 45 is rotatably supported around the rotation axis AX2 by bearings spaced apart in the left-right direction. The rotation axis AX2 intersects (more specifically, is perpendicular to) the rotation axis AX1 of the motor shaft 42. The large bevel gear 44 is fixed around the spindle 45 at its right end and meshes with the small bevel gear 43.

[0029] The spindle 45 extends horizontally within the gear housing 31, extending out of the gear housing 31 on the left side and into the cover body 34. Inside the cover body 34, an inner flange 46 is attached around the spindle 45. The inner flange 46 is a cylindrical member, and its right end protrudes radially outward in a flange-like manner with respect to the rotation axis AX2. A male threaded portion is formed on the left side of the spindle 45 beyond the inner flange 46, and a lock nut 47 is attached to this male threaded portion. The positions of the cutting tools 49 and 50 relative to the spindle 45 are fixed by placing a cutting tool 49, at least one (five in the example in Figure 12) annular spacers 48, and a cutting tool 50 between the right end of the inner flange 46 and the lock nut 47, and tightening the lock nut 47. The distance between the cutting tools 49 and 50 can be adjusted by changing the number of spacers 48 placed between the cutting tools 49 and 50.

[0030] With this configuration, the rotational driving force of the motor 41 (motor shaft 42) is transmitted to the cutting tools 49 and 50. As shown in Figure 5, an arrow 35 indicating the rotation direction of the cutting tools 49 and 50 is attached to the left side of the cover body 34.

[0031] As shown in Figures 1 and 2, the base member 20 is provided with an auxiliary cover portion 22 that extends from the base 21 toward the opposite side of the contact surface 23 (in other words, toward the main body portion 30). The auxiliary cover portion 22 extends inside the cover body 34 and above the lower edge of the cover body 34.

[0032] As shown in Figure 11, the base member 20 has an annular portion 25 at its rear end. The annular portion 25 is located on the upper side of the base 21. The main body 30 also has two annular portions 36. The two annular portions 36 are located on either side of the annular portion 25 in the left-right direction. A support shaft 26 extending in the left-right direction is positioned to pass through these annular portions 25 and 36. The base member 20 and the main body 30 are integrated via the support shaft 26. Wheels 27 are attached to both ends of the support shaft 26. The wheels 27 facilitate parallel movement in the front-rear direction when performing groove cutting by pressing the wall chaser 10 against the workpiece and moving it parallel to the workpiece.

[0033] The main body 30 is configured to swing relative to the base member 20 around the pivot shaft 26. The main body 30 is constantly biased away from the base member 20 by a torsion spring (not shown) arranged to surround the pivot shaft 26. Therefore, in the initial state, the main body 30 is held in the position shown in Figures 1 and 2. This position of the main body 30 is also called the top dead center. As shown in Figures 1 and 5, an arc-shaped through hole 37 is formed in the left portion of the cover body 34. A projection 28 protrudes to the left from the outer surface of the left portion of the auxiliary cover 22 so as to pass through this through hole 37. The position of the top dead center is defined by the projection 28 being located at the lower end of the through hole 37, and the lower edge of the cover body 34 is prevented from being displaced above the upper edge of the auxiliary cover 22. As shown in Figures 1 and 2, when the main body 30 is at the top dead center, the cutting tools 49 and 50 are positioned above the base 21. At this time, the auxiliary cover portion 22 of the base member 20 covers the portion of the cutting tools 49 and 50 that is lower than the cover body 34.

[0034] The position of the lower moving end (lower limit of movement) of the main body 30 in relation to the swinging motion of the main body 30 can be variably set by the cutting depth adjustment mechanism 38 (hereinafter simply referred to as the adjustment mechanism 38). Specifically, as shown in Figures 1 and 2, the cutting depth adjustment mechanism 38 comprises a bolt, a nut screwed onto the bolt, and an operating lever. The head of the bolt is located outside (to the right) of the right portion of the cover body 34, and the operating lever is attached around it. An arc-shaped through hole 39 is formed in the right portion of the cover body 34. The bolt is positioned to pass through this through hole 39. The nut is located inside (to the left) of the right portion of the cover body 34. By operating the operating lever to loosen the bolt, the user can move the adjustment mechanism 38 to any position along the arc shape of the through hole 39. 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 in its current position relative to the cover body 34.

[0035] The main body 30 can be pushed down by the user until the bolt of the adjustment mechanism 38 contacts the upper edge 29 of the auxiliary cover 22. In other words, the position where the bolt of the adjustment mechanism 38 and the upper edge 29 of the auxiliary cover 22 contact each other is the position of the lower moving end of the main body 30. When the adjustment mechanism 38 sets the position of the lower moving end to the lowest part of its range of motion, the position of the main body 30 when it is lowered to the lower moving end is also called the bottom dead center.

[0036] As shown in Figures 4, 8, and 11, when the main body 30 is at the bottom dead center (or at the lower moving end), the cutting tools 49 and 50 partially protrude downwards beyond the lower surface (contact surface 23) of the base 21 through the through hole 24 (see Figure 11) of the base 21. This mechanism allows the user to adjust the cutting depth with the cutting tools 49 and 50. When the user releases the downward force pushing the main body 30 while it is at the lower moving end, the main body 30 returns to the top dead center due to the biasing force of the torsion spring.

[0037] As shown in Figures 5 and 6, the main body 30 further includes a battery mounting section 51 configured to detachably accommodate a battery 54 for supplying power to the motor 41. The battery mounting section 51 is located above the rear housing 33 and is integrally formed with the rear housing 33. The battery mounting section 51 allows the battery 54 to be attached and detached by sliding it from the rear to the front. Specifically, the battery mounting section 51 has a plurality of terminals 52 that extend in a rail-like manner. When the battery 54 is slid into the battery mounting section 51 in the direction in which the plurality of terminals 52 extend, the plurality of terminals 52 and the plurality of terminals (not shown) of the battery 54 are electrically connected.

[0038] As shown in Figures 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 placed when the battery 54 is mounted in the battery mounting portion 51. As shown in Figures 1 and 2, in this embodiment, the battery 54 is mounted in the battery mounting portion 51 in an inclined position such that the front portion of the battery 54 (the front portion in the mounting direction) is closer to the contact surface 23 (the rotation axis AX2 of the cutting tools 49, 50) than the rear portion of the battery 54 in the vertical direction. Therefore, the sliding direction of the battery 54 (in other words, the terminals 52 and the mounting surface 53) is also oriented with the same inclination as this inclined position. With this configuration, the user can easily attach the battery 54 to the battery mounting portion 51 by utilizing the weight of the battery 54. Furthermore, compared to the case where the battery 54 is slid horizontally, the distance between the battery 54 and the first handle 60 (described later) is greater when attaching or detaching the battery 54 (making interference less likely), thus making it easier to attach and detach the battery 54. However, the sliding direction and mounting position of the battery 54 can be set arbitrarily.

[0039] As shown in Figure 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 section 51 and the motor 41, and controls the supply of power 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 over-discharge protection circuit. However, one or two of these protection circuits may be omitted.

[0040] The controller 55 is positioned adjacent to the motor 41 in the front-rear direction. Furthermore, the controller 55 is positioned overlapping the battery 54 when viewed in the vertical direction. This arrangement reduces the distance between the battery 54 and the controller 55, and between the controller 55 and the motor 41, thereby simplifying the electrical wiring required to connect them.

[0041] As shown in Figures 1 and 2, the main body 30 further includes a first handle 60 and a second handle 70. The first handle 60 is adjacent to the rear housing 33 and is located on the rear side of the rear housing 33. The first handle 60 is a so-called loop handle and includes a first gripping portion 61 for the user to grasp by hand, a cylindrical base portion 63, and bridge portions 64 and 65 that connect the first gripping portion 61 and the base portion 63 in a loop. An operating member 62 for starting and stopping the motor 41 is attached to one side of the first gripping portion 61 in the direction in which the first gripping portion 61 extends (near the connection portion between the first gripping portion 61 and the bridge portion 64).

[0042] As shown in Figure 13, a switch 56 is housed inside the first gripping part 61, which sends control signals for starting and stopping the motor 41 to the controller 55. When the user pulls the operating member 62 backward, the operating member 62 presses against the actuator of the switch 56, and the switch 56 turns ON to start the electric motor 41. When the user releases the pulling operation, the pressure from the operating member 62 is released, and the switch 56 turns OFF to stop the electric motor 41.

[0043] 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 Figure 13, two recesses 33a extending in the circumferential direction are formed in the cylindrical rear end of the rear housing 33. Two protrusions 63a extending in the circumferential direction are formed in the cylindrical base 63 of the first handle 60. The two protrusions 63a are fitted into the two recesses 33a. Therefore, the base 63 (and thus the first handle 60) is attached to the rear end of the rear housing 33 in a retaining state and is rotatable about a rotation axis parallel to the rotation axis AX1.

[0044] In this embodiment, the first handle 60 is configured to be selectively fixed in one of three different angular positions (rotational positions) shown in Figures 7, 9, and 10, respectively. Specifically, as shown in Figures 13 and 14, an operating member 66 is positioned near the base end (front end) of the bridge portion 64 of the first handle 60. The operating member 66 is sandwiched on both sides by the base portion 63, restricting its circumferential movement with respect to the rotation axis of the first handle 60. The operating member 66 is also held by the base portion 63 and the rear housing 33 so as to be movable in the front-rear direction.

[0045] The operating member 66 comprises an operating portion 67 that protrudes radially outward and an engaging portion 68 that protrudes forward. A recess 33b that fits the engaging portion 68 is formed in the upper part of the rear housing 33. A coil spring 69 is positioned 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 constantly biased forward by the biasing force of the coil spring 69. Therefore, in the initial state, as shown in Figures 13 and 14, the engaging portion 68 is housed in the recess 33b. As a result, the circumferential movement of the operating member 66, and thus the first handle 60, is restricted.

[0046] When a user places their fingers on the front of the operating section 67 and pulls it backward, the operating member 66 moves backward against the biasing force of the coil spring 69. As a result, as shown in Figure 15, the engaging portion 68 of the operating member 66 moves to the outside of the recess 33b, and the engagement between the engaging portion 68 and the recess 33b is released. Therefore, circumferential movement of the operating member 66 and the first handle 60 is permitted. At this time, the rear end of the operating member 66 is housed in the recess formed on the front end surface of the base 63.

[0047] Although not shown in the diagram, the rear housing 33 also has recesses of the same shape as recess 33b, formed at a position rotated 90 degrees to the left and 90 degrees to the right of the rotation axis of the first handle 60 relative to recess 33b. When the first handle 60 is in the angular position shown in Figure 7, the first handle 60 is rotated 90 degrees to the left while pulling the operating part 67, and then the pulling operation of the operating part 67 is released, causing the operating member 66 to return to the front due to the biasing force of the coil spring 69. As a result, the engaging part 68 fits into the recess of the rear housing 33. This restricts the circumferential movement of the first handle 60, and the angular position of the first handle 60 (first gripping part 61) is fixed at the position shown in Figure 9. When the first handle 60 is in the position shown in Figure 9, the user can easily pull the operating member 62 with their index finger by grasping the first gripping part 61 with their left hand.

[0048] Although a detailed explanation is omitted, similarly, when the first handle 60 is in the angular position shown in Figure 7, the first handle 60 is rotated 90 degrees to the right while pulling the operating part 67, and then the pulling operation of the operating part 67 is released, fixing the angular position of the first handle 60 (first gripping part 61) in the position shown in Figure 10. When the first handle 60 is in the position shown in Figure 10, the user can easily pull the operating member 62 with their index finger by grasping the first gripping part 61 with their right hand.

[0049] When the first handle 60 is in the position shown in Figures 1, 2, and 8, the first gripping portion 61 extends in a direction that is not parallel to the front-rear direction and perpendicular to the rotation axis AX2. More specifically, as shown in Figures 1 and 2, when the main body 30 is at top dead center, the first gripping portion 61 extends in a direction perpendicular to the front-rear direction and the rotation axis AX2 (i.e., the up-down direction). As shown in Figure 8, when the main body 30 is at bottom dead center, the first gripping portion 61 extends in a direction perpendicular to the rotation axis AX2 and angled such that the lower end of the first gripping portion 61 is located behind the upper end. When the first handle 60 is in the position shown in Figure 9 or Figure 10, the first gripping portion 61 extends in the left-right direction parallel to the rotation axis AX2, regardless of whether the main body 30 is at top dead center or bottom dead center.

[0050] As shown in Figures 1 and 2, the second handle 70 is positioned in front of the first handle 60. More specifically, the second handle 70 is attached to the upper part of the cover body 34 near the front end of the cover body 34. As shown in Figure 5, the second handle 70 is a so-called loop handle and comprises a second gripping portion 71 for the user to grasp with their hand, base portions 72, 73, and bridge portions 74, 75. The base portions 72, 73 are positioned on either side of the annular portion 34a in the left-right direction. The annular portion 34a is a portion integrally formed with the cover body 34 so as to protrude upward from the cover body 34. The bridge portions 74, 75 connect the base portions 72, 73 and the second gripping portion 71 such that a gap is formed between the base portions 72, 73 and the second gripping portion 71.

[0051] 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 Figure 16, a support shaft 76 extending parallel to the second gripping portion 71 passes through the base portions 72, 73 and the annular portion 34a in the left-right direction. With this configuration, the second handle 70 is rotatably supported by the support shaft 76, which is supported by the annular portion 34a.

[0052] A hexagonal nut 77 is attached to the left end of the pivot shaft 76, which is threaded onto a male screw formed at the tip of the pivot shaft 76. The hexagonal nut 77 is housed inside the base 72 in a non-rotating state. A knob 79 is attached to the right end of the pivot shaft 76. The knob 79 is located to the right of the base 73. When the user loosens the knob 79, the second handle 70 becomes rotatable around the pivot shaft 76. When the user tightens the knob 79 while the second handle 70 is in the desired rotational position, the hexagonal nut 77 and the knob 79 tighten the base 72, 73 and the annular portion 34a in the left-right direction, fixing the rotational position of the second handle 70. With this configuration, the user can rotationally change the fixed position of the second gripping portion 71. Furthermore, each of the base portion 72, base portion 73, and annular portion 34a has multiple recessed and recessed shapes formed along the circumferential direction, and the second handle 70 can be fixed at any position in which the recessed and recessed shapes of the base portions 72 and 73 and the recessed and recessed shapes of the annular portion 34a interlock with each other. As shown in Figures 7 and 8, the second gripping portion 71 extends in the left-right direction parallel to the rotation axis AX2, regardless of whether the main body portion 30 is at top dead center or bottom dead center.

[0053] The wall chaser 10 described above can be used as follows. First, the user grasps the first gripping part 61 with one hand and the second gripping part 71 with the other hand. Next, the user positions the wall chaser 10 so that the contact surface 23 contacts the workpiece. Next, the user operates the motor 41 by pulling the operating member 62 with the fingers of the hand that is gripping the first handle 60. Next, the user applies force with the hand holding the second handle 70 to press the main body 30 toward the base 21, displacing the main body 30 from the top dead center to the bottom dead center. Then, the user moves the wall chaser 10 in the front-rear direction to perform grooving. In this embodiment, the direction in which the grooving is advanced by the wall chaser 10 (hereinafter also referred to as the processing direction) is from the front to the rear. However, the wall chaser 10 may be designed so that the processing direction is from the rear to the front. Alternatively, the wall chaser 10 (for example, the shape of the cutting tools 49, 50) may be designed so that the user can select the machining direction from either front to back or back to front, depending on the situation.

[0054] Such operations may be performed by gripping the first gripping part 61 with the right hand and the second handle 70 with the left hand, or vice versa. For example, if there are walls extending vertically in front of and to the left of the user, the user can grip the first gripping part 61 with the right hand and the second gripping part 71 with the left hand, and move the wall chaser 10 in a parallel direction away from the left wall, thereby forming a groove in the front wall from near the left wall. Conversely, if there are walls extending vertically in front of and to the right of the user, the user can grip the first gripping part 61 with the left hand and the second gripping part 71 with the right hand, and move the wall chaser 10 in a parallel direction away from the right wall, thereby forming a groove in the front wall from near the right wall.

[0055] In the wall chaser 10 described above, the battery 54 is generally positioned in front of the first gripping portion 61. Therefore, even when the contact surface 23 is brought into contact with a wall extending vertically and groove cutting is performed in the horizontal direction, the generation of a downward moment due to the weight of the battery 54 is suppressed, and the rear part of the wall chaser 10 can be easily supported by the hand gripping the first gripping portion 61. Also, the battery 54 is generally positioned behind the second gripping portion 71. Therefore, for the same reason, the front part of the wall chaser 10 can be easily supported by the hand gripping the second gripping portion 71. Such effects can be obtained to some extent even when the battery 54 is partially positioned in front of the first gripping portion 61, and / or when the battery 54 is partially positioned behind the second gripping portion 71.

[0056] Furthermore, since the battery 54 is located between the first handle 60 and the second handle 70, in the front-to-back direction, the position of the battery 54 approaches the center between the position where the user grips the first gripping part 61 with one hand and the position where the user grips the second gripping part 71 with the other hand. In other words, the center of gravity of the wall chaser 10 is prevented from being biased to one side of the right or left hand that supports the wall chaser 10. As a result, the user can support the wall chaser 10 more stably. In addition, the wall chaser 10 can be made more compact in the front-to-back direction.

[0057] Furthermore, as shown in Figures 4,7-10, the battery 54 intersects three-dimensionally with a virtual straight line L1 connecting the center C1 of the first gripping part 61 and the center C2 of the second gripping part 71. Therefore, the battery 54 is located on the straight line connecting the position where the user grips the first gripping part 61 with one hand and the position where the user grips the second gripping part 71 with the other hand. As a result, the generation of a downward moment due to the weight of the battery 54 is further suppressed, and the user can support the wall chaser 10 more easily. Note that centers C1 and C2 refer to three-dimensional center positions.

[0058] Furthermore, as shown in Figures 12-15, 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 horizontal direction. Therefore, the wall chaser 10 can be made more compact in the horizontal direction. In addition, the motor 41 is located behind the rotation axis AX2 of the cutting tools 49 and 50. The battery 54 is also located partially behind the motor 41, and the positions of the battery 54 and the motor 41 in the horizontal direction overlap. This arrangement also allows the wall chaser 10 to be made more compact in the horizontal direction.

[0059] Furthermore, since the first handle 60 is rotatable about a rotation axis extending in the front-rear direction, the first gripping part 61 can be oriented in a way that is easy for the user to use, depending on the situation. For example, when cutting grooves in a ceiling or floor, if the first gripping part 61 is oriented to the angular position shown in Figure 7, the user's left and right hands gripping the first gripping part 61 and the second gripping part 71 will be in a comfortable position, improving convenience. Alternatively, when cutting grooves in a wall, the same effect can be obtained if the first gripping part 61 is oriented to the angular position shown in Figure 9 or Figure 10.

[0060] The wall chaser 10 described above has a function to lock the main body 30 at the top dead center. This function will be explained below. As shown in Figure 11, the wall chaser 10 is equipped with a locking operating member 81. The locking operating member 81 is positioned adjacent to the second gripping portion 71. Specifically, the locking operating member 81 is positioned so that its longitudinal direction is parallel to the extending direction of the second gripping portion 71. As shown in Figures 11 and 16, one edge of the locking operating member 81 in its short direction is housed inside the second gripping portion 71, and it is supported by the second gripping portion 71 so as to be rotatable about a rotation axis parallel to the second gripping portion 71 (a rotation axis extending in the left-right direction). Most of the locking operating member 81 is exposed on the outside of the second gripping portion 71 (on the base portion 73, 74 side).

[0061] The locking operating member 81 is manually displaceable (rotatable) between a locked position (see Figure 16) for locking the main body 30 at its top dead center and an unlocked position (see Figure 17) that allows the main body 30 to move from its top dead center to its bottom dead center. In the initial state, the locking operating member 81 is biased to the locked position by a first link lever 83, which is biased by a compression spring 87. When the user grips the second gripping portion 71, the locking operating member 81 is also gripped, causing it to rotate from the locked position to the unlocked position. As shown in Figure 17, the locking operating member 81 is provided with a projection 82 that protrudes radially outward with respect to its axis of rotation.

[0062] As shown in Figure 16, the wall chaser 10 further includes a first link lever 83. The first link lever 83 has a first end 84 and a second end 86, and has a substantially L-shaped form that is bent at a curved portion. The portion of the first link lever 83 on the first end 84 side of the curved portion is housed in the second gripping portion 71. The portion of the first link lever 83 on the second end 86 side of the curved portion is housed in the bridge portion 75.

[0063] Approximately in the center of the portion closer to the second end 86 than the curved section, cylindrical projections 85 are formed, one at the front and one at the rear. The first link lever 83 is tiltable between the position shown in Figure 16 and the position shown in Figure 17, with the contact point between the projection 85 and the inner surface of the bridge 75 as the pivot point. A compression spring 87 is positioned between the first end 84 and the inner surface of the second gripping portion 71. The compression spring 87 constantly biases the first end 84 toward the locking operating member 81. Therefore, in the initial state, the first link lever 83 is held in the position shown in Figure 16. A through hole extending in the left-right direction is formed in the second end 86, and the support shaft 76 passes through the second end 86 via this through hole.

[0064] As shown in Figure 16, the wall chaser 10 further comprises a first sleeve 88 and a second sleeve 89. 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 passes through them, and are displaceable in the left-right direction along the support shaft 76. The first sleeve 88 is housed in the base 73 so as to the left of the second end 86 of the first link lever 83 and adjacent to the second end 86. The second sleeve 89 is housed in the annular portion 34a so as to the left of the first sleeve 88 and adjacent to the first sleeve 88. By using two separate sleeves (the first sleeve 88 and the second sleeve 89), the first sleeve 88 can be attached to the second handle 70 (base portion 73), and the second sleeve can be attached to the cover body 34 (annular portion 34a), after which the second handle 70 and the cover body 34 can be easily assembled.

[0065] As shown in Figures 16 and 18, the wall chaser 10 further includes a second link lever 90. The second link lever 90 has a first end 91 and a second end 92 (see Figure 18) and has a bent shape at a curved portion. The second link lever 90 is tiltably housed within the cover body 34. The second link lever 90 has cylindrical projections 95 at the front and rear near the center. The second link lever 90 is tiltable with the contact points between the projections 95 and the inner surface of the cover body 34 as pivot points. A through hole in the left-right direction is formed in the first end 91, and a support shaft 76 passes through the first end 91 via this through hole. This first end 91 is adjacent to the second sleeve 89 on its left side.

[0066] A compression spring 94 is positioned between the annular portion 34a and the first end portion 91. The compression spring 94 constantly biases the first end portion 91 to the right. Therefore, in the initial state, the second link lever 90 is held in the position shown in Figure 16. Also, due to the biasing force of the compression spring 94, the first end portion 91 is constantly in contact (engaged) with the second sleeve 89 in the left-right direction.

[0067] As shown in Figure 16, the second end portion 92 has an engaging portion 93 that protrudes to the left. In the state shown in Figure 16, when the locking operating member 81 is in the locked position, the engaging portion 93 protrudes inward from the right side of the cover body 34 through a through hole (not shown) in the cover body 34. At this time, the upper edge portion 29 of the auxiliary cover portion 22 is located below the engaging portion 93. Therefore, in the state shown in Figure 16, when the locking operating member 81 is in the locked position, even if the user applies a downward force to the second handle 70 to displace the main body portion 30 from the top dead center to the bottom dead center, such displacement is prevented because the engaging portion 93 engages (contacts) with the upper edge portion 29.

[0068] On the other hand, when the user grips and operates the locking operating member 81, causing it to rotate from the locked position (Figure 16) to the unlocked position (Figure 17), as shown in Figure 17, the projection 82 of the locking operating member 81 presses the first end 84 of the first link lever 83 away from the locking operating member 81. As a result, the first link lever 83 tilts against the biasing force of the compression spring 87. This causes the second end 86 of the first link lever 83 to press the first sleeve 88 to the left. Consequently, the first sleeve 88 and the second sleeve 89 move to the left. In this way, the first link lever 83 converts the rotational displacement of the locking operating member 81 from the locked position to the unlocked position into displacement of the first sleeve 88 and the second sleeve 89 in a direction parallel to the pivot axis 76.

[0069] As the first sleeve 88 and the second sleeve 89 move to the left, the first end 91 of the second link lever 90 is pressed to the left by the second sleeve 89. This causes the second link lever 90 to tilt against the biasing force of the compression spring 94, so that the first end 91 moves to the left and the second end 92 (and consequently the engaging portion 93 formed on the second end 92) moves to the right. In this way, the second link lever 90 converts the displacement of the first sleeve 88 and the second sleeve 89 in a direction parallel to the pivot shaft 76 into a displacement (tilting) in a different direction. As a result, the engaging portion 93 retracts to a position where it does not interfere with (engage) the upper edge portion 29. Therefore, displacement of the main body portion 30 from top dead center to bottom dead center is permitted. When the main body 30 is in a position other than top dead center, the locking operating member 81 is released, and the projection 93 comes into contact with the right side surface of the auxiliary cover 22. When the main body 30 is swung up and down, the tip of the projection 93 slides along the surface of the right side of the auxiliary cover 22. When the main body 30 is returned to top dead center, the projection 93 reaches the upper edge 29, and is automatically locked by the biasing force of the compression spring 94.

[0070] According to the above 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 that interlocks with the locking operating member 81, and changes the engagement relationship between the engaging portion 93 and the upper edge portion 29 of the auxiliary cover portion 22 in accordance with the displacement of the locking operating member 81. For this reason, the top dead center locking function can be suitably realized when the second gripping portion 71 of the rotary second handle 70 and the locking operating member 81 are arranged adjacent to each other.

[0071] In order to achieve a top dead center locking function in an arrangement where the second gripping portion 71 of the rotary second handle 70 and the locking operating member 81 are adjacent to each other, the challenge is to transmit the displacement force of the locking operating member 81 to the engaging portion 93 without being affected by the rotational movement of the second handle 70. In the above embodiment, this challenge is solved by using a first sleeve 88 and a second sleeve 89, which are displaceable in a direction parallel to the pivot shaft 76, as part of a link mechanism. Moreover, since the first sleeve 88 and the second sleeve 89 are arranged coaxially with the pivot shaft 76 so that the pivot shaft 76 passes through them, the structure of the second handle 70 and its surroundings can be made more compact.

[0072] Furthermore, the first link lever 83 can change the direction of action of the displacement force of the locking operating member 81 and transmit it to the first sleeve 88 and the second sleeve 89. Therefore, the operating direction of the locking operating member 81 can be set to a direction that is easy for the user to grasp. Also, the second link lever 90 can change the direction of action 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 to a direction suitable for top dead center locking. In other words, the design freedom for top dead center locking is improved.

[0073] Furthermore, since the first link lever 83 is housed within the second handle 70, the structure of the second handle 70 and its surroundings can be made more compact. Since the second link lever 90 is housed within the cover body 34, the structure of the main body 30 and its surroundings can be made more compact.

[0074] Furthermore, the support shaft 76 passes through the first end 91 of the second link lever 90, and the second link lever 90 engages with the second sleeve 89 by the first end 91 contacting the second sleeve 89 in the axial direction of the support shaft 76. Therefore, the second link lever 90 can be supported by the support shaft 76 with a simple structure, while the second sleeve 89 and the second link lever 90 can be easily interlocked.

[0075] Furthermore, when the locking operating member 81 is in the locked position, the engaging portion 93 engages with the upper edge portion 29 of the auxiliary cover portion 22 extending upward from the base 21, thereby preventing the displacement of the main body portion 30 from the top dead center to the bottom dead center. As a result, the extension distance of the second link lever 90 can be shortened compared to a configuration in which the base 21 and the engaging portion 93 engage. Therefore, the link mechanism can be simplified and made lighter. However, the engaging portion 93 may engage with the base 21, or any portion fixed to the base 21.

[0076] While embodiments of the present invention have been described above, these embodiments are provided to facilitate understanding of the present invention and do not limit it. The present invention can be modified and improved without departing from its spirit, and equivalents thereof are included. Furthermore, any combination or omission of the elements described in the claims and specification is possible to the extent that at least some of the above-described problems can be solved or at least some of the effects can be achieved.

[0077] For example, a handle of any configuration (e.g., shape, orientation of gripping portion, etc.) may be used instead of the first handle 60 and the second handle 70. For example, a handle having the same structure as the second handle 70 may be used instead of the first handle 60. Alternatively, a handle with a fixed gripping portion may be used.

[0078] Alternatively, the locking operating member 81 is not limited to a rotary type, but can be transformed into any form that displaces in any direction. For example, instead of a rotary locking operating member 81, a sliding operating member that displaces in the left-right direction may be used.

[0079] Alternatively, the various interlocking operations between multiple members described above are not limited to the above-described configuration and may be achieved by any mechanical configuration capable of achieving similar functions. For example, instead of the first sleeve 88 and the second sleeve 89, a columnar member extending parallel to the support shaft 76 (outside the second handle 70 and the annular portion 34a) may be arranged in conjunction with the locking operation member 81 to displace parallel to the support shaft 76. In this case, the columnar member may be solid or hollow. The outer diameter of the columnar member may be cylindrical or prismatic. Furthermore, the first link lever 83 and the second link lever 90 may be changed to any shape and arrangement so as to be interlocked with the columnar member.

[0080] 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 cutting edges may be used.

[0081] Alternatively, the base member 20 may be omitted. In this case, the configuration for swinging the main body 30 relative to the base member 20 is also omitted.

[0082] The 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 the components 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". Cutting tools 49 and 50 are examples of "cutting tools". Rotation axis AX2 is an example of a "rotation axis". Motor 41 is an example of a "motor". Battery mounting part 51 is an example of a "motor mounting part". Battery 54 is an example of a "battery". First handle 60 is an example of a "first handle". First gripping part 61 is an example of a "first gripping part". Second handle 70 is an example of a "second handle". Second gripping part 71 is an example of a "second gripping part". Motor shaft 42 is an example of a "motor shaft". Controller 55 is an example of a "controller". Alternatively, the rear side of the wall chaser 10 can be considered the "second side," and the front side of the wall chaser 10 can be considered the "first side." In this case, the first handle 60 is an example of a "second handle," and the second handle 70 is an example of a "first handle." [Explanation of Symbols]

[0083] 10...Wall Chaser 20...Base component 21...bass 22... Auxiliary cover section 23...Abutment surface 24...Through hole 25... Ring section 26...Spindle 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... Ring section 35...Arrow 36... Ring section 37... Through hole 38...Cutting depth adjustment 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 nuts 48...Spacer 49,50...cutting tools 51...Battery mounting section 52... Terminals 53... Mounting surface 54... Battery 55...Controller 56...Switch 60...First handle 61...First gripping part 62...Operating member 63...Base 63a... protruding part 64... Bridge section 66...Operating member 67...Operation unit 68...Engaging part 69... Coil spring 70...Second handle 71...Second gripping part 72,73...Base 74, 75... Bridge section 76...Spindle 77...Hex nuts 79... Nobu 81... Locking operating 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 part 94...Compression spring 95...protrusion C1,C2,C3...center L1...Virtual straight line AX1... Rotation axis AX2... Rotation axis

Claims

1. A wall chaser, a motor configured to provide a rotational drive force to the cutting tool about an axis of rotation; a battery mounting section configured to detachably mount a battery for providing power to the motor; a first handle having a first grip portion; a second handle having a second gripping portion; Equipped with When one side of a moving direction in which the wall chaser is moved parallel to the workpiece when performing groove cutting is defined as a first side, and the other side is defined as a second side, the first gripping portion is disposed on the first side relative to the second gripping portion, the battery mounting portion is disposed such that, when the battery is mounted on the battery mounting portion, the battery is at least partially positioned on the second side relative to the first grip portion. Wall chaser.

2. 2. The wall chaser of claim 1, the battery mounting portion is disposed such that, when the battery is mounted on the battery mounting portion, the battery is at least partially positioned on the first side relative to the second grip portion. Wall chaser.

3. The wall chaser according to claim 1 or 2, the battery mounting portion is disposed such that, when the battery is mounted on the battery mounting portion, a virtual line connecting a center of the first grip portion and a center of the second grip portion intersects with the battery. Wall chaser.

4. A wall chaser according to any one of claims 1 to 3, The battery mounting portion is disposed such that, when the battery is mounted on the battery mounting portion, the battery is entirely located between the first grip portion and the second grip portion in the moving direction. Wall chaser.

5. A wall chaser according to any one of claims 1 to 4, the motor comprises a motor shaft; The battery mounting section is disposed such that, when the battery is mounted on the battery mounting section, the battery and the motor shaft at least partially overlap each other as viewed in a direction perpendicular to the moving direction and the rotation axis. Wall chaser.

6. A wall chaser according to any one of claims 1 to 5, The battery mounting section is configured to be able to slidably attach and detach the battery in a position inclined so that a front portion of the battery mounting direction is closer to the rotation axis than a rear portion of the battery mounting direction in a direction perpendicular to the movement direction and the rotation axis. Wall chaser.

7. A wall chaser according to any one of claims 1 to 6, The first handle is configured to allow the first grip portion to be oriented to extend in a direction non-parallel to the direction of movement and perpendicular to the axis of rotation; The second handle is configured to allow the second gripping portion to be oriented to extend in a direction parallel to the axis of rotation. Wall chaser.

8. A wall chaser according to any one of claims 1 to 7, The first handle is configured to allow the first grip portion to be oriented to extend in a direction parallel to the axis of rotation; The second handle is configured to allow the second gripping portion to be oriented to extend in a direction parallel to the axis of rotation. Wall chaser.

9. A wall chaser according to claim 8, which includes claim 7 as a dependent, The first handle is configured to be rotatable between a first angular position in which the first gripping portion is oriented so as to extend in a direction non-parallel to the moving direction and perpendicular to the rotation axis, and a second angular position in which the first gripping portion is oriented so as to extend in a direction parallel to the rotation axis, and is configured to be capable of selectively fixing the first gripping portion to either the first angular position or the second angular position. Wall chaser.

10. A 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 attached to the battery attachment section, the battery is at least partially located on the first side of the motor; A position of the battery in a direction parallel to the rotation axis and a position of the motor in a direction parallel to the rotation axis overlap with each other. Arranged as Wall chaser.

11. 11. A wall chaser according to claim 10, a controller configured to control a supply of power from the battery to the motor; The controller is disposed adjacent to the motor in the moving direction and overlaps with the battery when viewed in a direction perpendicular to the moving direction and the rotation axis when the battery is attached to the battery attachment section. Wall chaser.

12. A wall chaser according to any one of claims 1 to 11, The battery and the cutting tool are provided Wall chaser.

Images