JP2024077647A - Power Work Machine - Google Patents

Abstract

There is a need for a power working machine that can suppress the loss of light quantity from the starting end face to the terminal end face of a light guide rod and can brightly illuminate an irradiation area.
[Solution] The power working machine 1 has an LED 31 housed in a main body housing 11. The power working machine 1 has a first light guiding rod 32 which has a first start end face 32a facing the LED 31 and guides light incident from the first start end face 32a to a first end face 32c and irradiates the light from the first end face 32c. The power working machine 1 has a second light guiding rod 35 which has a second start end face 35a facing the LED 31 and guides light incident from the second start end face 35a to the second end face 35c and irradiates the light from the second end face 35c.
[Selected figure] Figure 10

Description

The present invention relates to a power tool used for cutting workpieces such as wood.

For example, power tools known as routers or trimmers (English: laminate trimmers) are used primarily to perform cutting processes such as edge processing and groove cutting on workpieces such as wood. This type of power tool has an electric motor as a drive source, an output shaft that rotates by the driving force of the electric motor, and a base that abuts against the top surface of the workpiece. The output shaft extends vertically from below the electric motor to the bottom surface of the base. A cutting tool attached to the tip of the output shaft is pressed against the edge or top surface of the workpiece while rotating around the output shaft with the cutting tool protruding downward from the base. This allows the workpiece to be cut.

The power working machine is equipped with a lighting device to improve visibility of the tip of the cutting tool cutting into the workpiece and visibility when aligning the tip of the cutting tool with the fillet line drawn on the workpiece. Patent Document 1 discloses a power working machine having two sets of lighting devices equipped with LEDs. Each lighting device is unitized and installed inside a housing that contains an electric motor. Each lighting device illuminates the area where the cutting tool is cutting as it descends from above toward the base below. Each lighting device is installed at positions spaced apart from each other, for example, at positions symmetrically spaced a predetermined distance from the output shaft.

As described in the cited document 1, the unitized lighting devices installed in conventional power working machines had to be equipped with one LED each. Moreover, each lighting device was unitized using a hard synthetic resin or the like. This made it difficult to significantly change the shape of each lighting device. Therefore, for example, when there was a demand for a more compact power working machine and the space inside the housing had to be reduced, it was difficult to change the shape of two lighting devices to fit into a small space.

Cited Document 2 discloses a structure in which a light guide rod made of soft acrylic resin is used to guide the light emitted by one LED to an illumination area. The LED emits light toward one tip face (starting end face) of the light guide rod. As the light guide rod extends, it branches into multiple branched light guide rods. Each end face of the branched light guide rods illuminates, for example, the periphery of the tip of the tool tip that contacts the workpiece. Only one LED is required, and the shape of the light guide rod can be changed to, for example, a shape that follows the outer shape of the housing.

However, in the case of the light guide rod described in Reference 2, there is a large loss of light, especially at the branched portion, and there are cases where the amount of light irradiated at each end face is reduced. If the light guide rod is simply branched into a Y shape, light leaks out of the light guide rod from the base of the branch. On the other hand, if one tries to suppress the loss of light at the branched portion, the shape around the branched portion becomes complex, and the shape of the mold for forming the light guide rod also becomes complex. This leads to increased costs. Also, a certain amount of space is required to attach a light guide rod with a complex shape to the tool body, and it is difficult to accommodate it in the limited space inside the housing, for example. Therefore, there is room for improvement in order to further compactify the power tool.

JP 2002-337073 A JP 2011-167796 A

Therefore, there is a need for a powered work machine that can reduce the loss of light from the starting end to the ending end of the light guide rod and brightly illuminate the irradiation area.

According to one feature of the present disclosure, the powered work machine has a light source housed in a main body housing. The powered work machine has a first light guide rod that has a first starting end surface facing the light source and guides light incident from the first starting end surface to a first terminal end surface and irradiates the light from the first terminal end surface. The powered work machine has a second starting end surface facing the light source and has a second light guide rod that guides light incident from the second starting end surface to a second terminal end surface and irradiates the light from the second terminal end surface.

Therefore, the light emitted from the light source enters the first light guide rod directly from the first starting end face, and enters the second light guide rod directly from the second starting end face. The first light guide rod is provided without branching from the first starting end face, which is the light receiving surface, to the first end face, which is the light emitting surface. The second light guide rod is provided without branching from the second starting end face, which is the light receiving surface, to the second end face, which is the light emitting surface. This makes it possible to suppress the loss of light from the first starting end face to the first end face, and also to suppress the loss of light from the second starting end face to the second end face. Moreover, the irradiation area can be illuminated from two points, the first end face and the second end face. In this way, the loss of light passing through the first light guide rod and the second light guide rod can be suppressed, and the irradiation area can be brightly illuminated.

In addition, the first light guiding rod and the second light guiding rod can be provided with independent shapes. This allows for greater freedom in the shapes and mounting postures of the first and second light guiding rods. This allows the first and second light guiding rods to be arranged in a limited space within the main housing, and prevents increases in the cost of the molds used to form the first and second light guiding rods. In addition, the number of light sources can be reduced, which improves the compactness of the main housing.

1 is an overall perspective view of a power working machine according to a first embodiment of the present disclosure; FIG. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, and is a vertical cross-sectional view of the power working machine. 3 is a cross-sectional view taken along line VV in FIG. 2, showing a vertical cross-sectional view of the power working machine. 6 is a cross-sectional view of the power working machine taken along line VI-VI in FIG. 2. FIG. 2 is a bottom view of the power working machine with the base removed. 2 is a perspective view of a first light guiding rod and a second light guiding rod. FIG. 11 is a perspective view including a partial vertical cross section showing an assembled state of a right half of a motor housing, a bracket, a first light guiding rod, and a second light guiding rod. FIG. 11 is an enlarged perspective view including a partial vertical cross section showing the assembled state of the left half of the motor housing, the bracket, the first light guiding rod, and the second light guiding rod. FIG. 2 is a rear view of the light source device, the first light guiding rod, and the second light guiding rod. FIG. FIG. 2 is a top view of the bracket, the first light guiding rod, and the second light guiding rod. FIG. 11 is a rear view of the first light guiding rod and the second light guiding rod in the second embodiment. FIG. 11 is a top view of a first light guiding rod and a second light guiding rod according to a second embodiment. FIG. 13 is a rear view showing a light guiding rod of a comparative example. FIG. 13 is a top view showing a light guiding rod of a comparative example. 13 is a diagram showing a case where an illumination area is illuminated by a first light guiding rod and a second light guiding rod in the first embodiment. FIG. 13 is a diagram showing a case where an illumination area is illuminated with a light guiding rod according to a comparative example. FIG.

According to another feature of the present disclosure, at least one of the first light guiding rod and the second light guiding rod includes a curved portion that is columnar over its entire length and at least a portion of which is curved. Therefore, by providing a curved portion, the degree of freedom in the arrangement and orientation of the first starting end face and the second starting end face is increased, and the degree of freedom in the arrangement and orientation of the first terminal end face and the second terminal end face is also increased. Therefore, it is easy to accommodate changes in the arrangement of the first starting end face, the second starting end face, and the light source without increasing the size of the first light guiding rod and the second light guiding rod. In addition, it is easy to accommodate design changes in the distance to the irradiation area of the first terminal end face and the second terminal end face, and the irradiation angle, without increasing the size of the first light guiding rod and the second light guiding rod.

According to another feature of the present disclosure, the main housing is cylindrical to accommodate the electric motor. The curved portion of the first light guiding rod or the second light guiding rod extends circumferentially along the inner peripheral surface of the main housing. Therefore, the first light guiding rod or the second light guiding rod can be accommodated within the main housing while preventing the main housing from becoming too large.

According to another feature of the present disclosure, the power working machine has an electric motor housed in a main body housing. The curved portion of the first light guiding rod or the second light guiding rod includes a first curved portion that curves along an imaginary plane perpendicular to the motor axis of the electric motor, and a second curved portion that curves from the imaginary plane in a direction along the motor axis. Therefore, the first curved portion can be housed in the main body housing by utilizing the shape that houses the electric motor without increasing the size of the main body housing. In addition, the second curved portion can be housed in the main body housing by utilizing the shape that houses the output shaft of the electric motor extending in the motor axis direction without increasing the size of the main body housing. In this way, the size of the main body housing can be suppressed.

According to another feature of the present disclosure, the first light guiding rod or the second light guiding rod has a mounting seat that is attached to the main housing. The mounting seat is provided on a side of the curved portion that is spaced apart from the outer circumferential curved surface of the curved portion. Therefore, the mounting seat can be provided at a location spaced apart from the light path. The outer circumferential curved surface is located on the light path as a reflective surface for light traveling through the first light guiding rod and the second light guiding rod. If the mounting seat is provided on the outer circumferential curved surface, the light will easily enter the mounting seat from the outer circumferential curved surface. This will result in a loss of light. By spacing the mounting seat away from the outer circumferential curved surface on the light path, the loss of light can be suppressed.

According to another feature of the present disclosure, a first space is provided between the light emitting end face of the light source device including the light source and the first starting end face of the first light guiding rod. A second space is provided between the light emitting end face of the light source device and the second starting end face of the second light guiding rod. Therefore, when the power work machine is assembled or vibration occurs during operation, the light emitting end face, the first starting end face, and the second starting end face can be prevented from being damaged. This can prevent the light transmittance of the first light guiding rod, the second light guiding rod, and the light emitting end face from being reduced. Furthermore, by providing the first space and the second space, there are fewer restrictions on the shape of the light source device. Therefore, a general-purpose light source device can be used.

According to another feature of the present disclosure, the main housing includes a first housing and a second housing that are assembled to each other. The light source is attached to the first housing. The first light guide rod and the second light guide rod are attached to the second housing. Therefore, by assembling the first housing and the second housing to each other, the light source, the first light guide rod, and the second light guide rod can be positioned relative to each other without adjustment. This improves the ease of assembly of the light source, the first light guide rod, and the second light guide rod.

According to another feature of the present disclosure, the first housing is fitted with a power source, wiring extending from the power source, and a light source connected to the wiring. The second housing is not provided with electrical components connected to the wiring. Therefore, by consolidating the electrical components including the light source on the first housing side, there is no need to provide wiring in the second housing. Therefore, first, the electrical components including the light source and the wiring are assembled to the first housing, and the first light guiding rod and the second light guiding rod are assembled to the second housing. The first housing and the second housing are then assembled to each other. This improves the ease of assembly of the main housing.

According to another feature of the present disclosure, the power working machine has an electric motor housed in a main body housing. The power working machine has an output shaft extending from the electric motor. The power working machine has a cooling fan that rotates by the output shaft and generates wind to cool the electric motor. A light source is disposed between the electric motor and the cooling fan and within the main body housing. Therefore, the light source is housed in the empty space between the electric motor and the cooling fan, and is disposed in a position closer to a power source electrically connected to the electric motor than the cooling fan. This makes it possible to prevent wiring that supplies power to the light source from being disposed near the cooling fan. This makes it possible to prevent the main body housing from becoming larger around the cooling fan.

According to another feature of the present disclosure, a groove extending beyond the cooling fan is provided on the inner peripheral surface of the main housing facing the cooling fan, and the first light guiding rod and/or the second light guiding rod are inserted into the groove. Therefore, the first light guiding rod and/or the second light guiding rod can be arranged across the radial outside of the cooling fan while preventing the main housing from becoming too large. In addition, the region close to the first starting end face of the first light guiding rod and/or the region close to the second starting end face of the second light guiding rod can be positioned by the groove. This improves the ease of assembly of the first light guiding rod and/or the second light guiding rod.

According to another feature of the present disclosure, the first starting end face of the first light guiding rod and the second starting end face of the second light guiding rod are adjacent to each other and located on the same imaginary plane or parallel to each other. The first end face of the first light guiding rod and the second end face of the second light guiding rod are spaced apart from each other. Therefore, the first starting end face and the second starting end face can be arranged together near a light source provided in one location. This makes it possible to make the area around the light source compact. In addition, by spacing the first end face and the second end face apart from each other, it is possible to suppress the occurrence of shadows in the illuminated area. This makes it possible to improve the visibility of the illuminated area.

According to another feature of the present disclosure, the first starting end of the first light guiding rod including the first starting end surface and the second starting end of the second light guiding rod including the second starting end surface are joined together side-by-side. Therefore, by reducing the number of parts, the number of dies for forming the first light guiding rod and the second light guiding rod can be reduced. This reduces manufacturing costs. In addition, the effort required to adjust the relative positions of the first light guiding rod and the second light guiding rod during assembly can be reduced. This improves the ease of assembly of the first light guiding rod and the second light guiding rod.

According to another feature of the present disclosure, the first light guiding rod and the second light guiding rod are formed from a single material with a light transmittance of 80% or more per mm. Therefore, the high light transmittance can reduce the loss of light from the first starting end face to the first terminal end face of the first light guiding rod, and from the second starting end face to the second terminal end face of the second light guiding rod. Moreover, by forming them from a single material, manufacturing costs can be reduced, and the light path can be easily simulated, making it easy to respond to design changes.

According to another feature of the present disclosure, the power working machine has a light source housed in a main housing. The power working machine has a first light guide rod that has a first starting end surface facing the light source and guides light incident from the first starting end surface to a first end surface and irradiates the light from the first end surface. The main housing is cylindrical to house the electric motor and includes a first housing and a second housing that are assembled to each other. The first light guide rod is columnar over its entire length and includes a curved portion that is at least partially curved. The curved portion of the first light guide rod extends in the circumferential direction along the inner peripheral surface of the main housing. The light source is attached to the first housing, and the first light guide rod is attached to the second housing. A first space is provided between the light emitting end surface of the light source device including the light source and the first starting end surface of the first light guide rod.

Therefore, the light emitted from the light source directly enters the first light guide rod from the first starting end surface and is sent to the first end surface through the first light guide rod that does not branch. Therefore, the loss of light from the first starting end surface to the first end surface can be suppressed. By providing a curved portion, the arrangement and orientation of the first starting end surface and the first end surface can be freely changed without increasing the size of the first light guide rod. By aligning the curved portion along the inner circumferential surface, the first light guide rod can be accommodated in the main housing while suppressing the increase in size of the main housing. By assembling the first housing and the second housing to each other, the light source and the first light guide rod can be positioned relative to each other without adjustment. Therefore, the assembling property of the light source and the first light guide rod can be improved. By providing the first space, it is possible to suppress damage to the light emitting end surface and the first starting end surface when the power work machine is assembled or when it vibrates during operation. This suppresses the reduction in the light transmittance of the first light guide rod and the light emitting end surface. In addition, by securing the first space, there are fewer restrictions on the shape of the light source device. Therefore, a general-purpose light source device can be used.

Next, an embodiment of the present disclosure will be described with reference to FIGS. 1 to 12. In this embodiment, a power working machine 1, known as a router, is illustrated as an example of a power working machine. The power working machine 1 has a window 3e (see FIG. 3), which will be described later. The user holds the power working machine 1 with the window 3e facing away from the user. In the following description, the side with the window 3e is the front side, and the opposite side with the window 3c is the rear side. The up, down, left, and right directions are defined as the directions seen by the operator positioned at the rear side of the power working machine 1 (the right side in FIG. 3). As shown in FIGS. 1 to 3, the power working machine 1 has a disk-shaped base 2 that abuts on the upper surface of the workpiece W, a main body support part 3 that is connected to the base 2 above the base 2, and a tool main body 10 that is supported by the main body support part 3 so as to be movable up and down. The main body housing 11 of the tool main body 10 houses an electric motor 20 (see FIG. 4) as a drive source.

As shown in Figures 4, 6, 9, and 10, the main housing 11 has a motor housing (first housing) 12 made of resin with a left and right half structure, and a bracket (second housing) 16 made of resin that covers the outer periphery of the motor housing 12. The right half 12b of the motor housing 12, which is separated into left and right halves, is shown in Figure 9, and a part of the left half 12a is shown in Figure 10. The motor housing 12 has a cylindrical portion 12i in the lower part, and a bulge portion 12j that bulges out to the side above the cylindrical portion 12i. The bracket 16 is formed in a cylindrical shape that covers the outer periphery of the cylindrical portion 12i.

As shown in Figures 1, 4, and 5, the main body support part 3 has a cylindrical base connecting part 3a that is connected to the base 2, and a cylindrical part 3b that is generally cylindrical and covers the outer periphery of the bracket 16 above the base connecting part 3a. The base connecting part 3a is thin in the vertical direction and is formed with approximately the same thickness as the base 2. The base 2 is provided with circular through holes 2a and 2b that penetrate in the vertical direction. The through hole 2a is provided in the center of the base 2 with a diameter that allows the tip cutting tool 22 described later to pass through. A plurality of through holes 2b are provided around the through hole 2a, for example six through holes are provided at equal angular intervals of 60° in the circumferential direction. The through holes 2a and 2b are exposed upward from the base connecting part 3a.

As shown in Figures 1 to 3, a window 3c is provided at the rear of the cylindrical portion 3b, which is an opening that allows the inside of the cylindrical portion 3b to be viewed. A window 3e is provided at the front of the cylindrical portion 3b, which is an opening that allows the inside of the cylindrical portion 3b to be viewed. By looking through the windows 3c and 3e, an operator can view the base 2, including the cutting tool 22 and the through holes 2a and 2b, from the outside. A pair of grip support parts 3d that protrude approximately horizontally outward to the left and right are provided on the left and right sides of the cylindrical portion 3b. A grip 6 is attached to each grip support part 3d. The grip 6 has an approximately cylindrical arm part 6a connected to the grip support part 3d and a grip part 6b provided at the tip of the arm part 6a. The grip part 6b is inclined downward from the front to the rear and has a longitudinal direction in the inclined direction. An operator can move the power work machine 1 horizontally along the top surface of the workpiece W by holding each of the pair of left and right grip parts 6b.

As shown in Figures 3 and 6, a lock lever 4 is provided at the front of the cylindrical portion 3b so that it can be opened and closed. When the lock lever 4 is open, the main body housing 11 can move up and down relative to the main body support portion 3. By moving the main body housing 11 up and down, the cutting depth of the cutting tool 22 into the workpiece W can be changed. When the lock lever 4 is closed as shown in the figures, the main body housing 11 is fixed at a predetermined height by moving it up and down relative to the main body support portion 3.

As shown in Figures 4 and 5, a height adjustment dial 5 capable of changing the height of the main body housing 11 is provided above the main body support part 3 and below the bulge part 12j of the motor housing 12. The height adjustment dial 5 is supported on the upper end of the main body support part 3 so as to be rotatable in the horizontal direction. The inner peripheral surface of the height adjustment dial 5 is provided with a spiral convex part 5a that extends in a spiral shape in the circumferential direction and protrudes radially inward. The outer peripheral surface of the bracket 16 is provided with a spiral concave part 16d that extends in a spiral shape in the circumferential direction and is concave inward in the radial direction. The spiral convex part 5a and the spiral concave part 16d are screwed together. The bracket 16 is prevented from rotating relative to the main body support part 3. When the height adjustment dial 5 is rotated in the horizontal direction, the bracket 16 that is prevented from rotating is moved up and down by the screwing of the spiral convex part 5a and the spiral concave part 16d. This allows the main body housing 11 to move up and down relative to the main body support part 3.

As shown in Figures 4 and 5, the electric motor 20 is mounted inside the cylindrical portion 12i of the motor housing 12. The electric motor 20 is a so-called brushless DC motor, and has a rotor 20b, a stator 20c, and a sensor board 20f. The rotor 20b is integral with the output shaft 20a. The output shaft 20a rotates around the motor axis J extending vertically from the center of the cylindrical portion 12i. The output shaft 20a is rotatably supported by bearings 20d and 20e. A left-right connecting portion 12g that connects the left half portion 12a and the right half portion 12b to the left and right is provided on the upper portion of the cylindrical portion 12i above the electric motor 20. The upper bearing 20d is press-fitted into a cylindrical recess 12h recessed in the center of the left-right connecting portion 12g. The lower bearing 20d is press-fitted into a cylindrical recess 16f recessed in the lower center of the bracket.

As shown in Figures 4 and 5, the stator 20c is fixed along the inner circumferential surface of the motor housing 12, radially outward from the rotor 20b. The sensor board 20f is fixed along the upper surface of the stator 20c, above the rotor 20b. The sensor board 20f is equipped with a magnetic sensor that detects the rotational position of the rotor 20b.

4 and 5, a cooling fan 21 that generates air to cool the electric motor 20 is attached to the output shaft 20a. The cooling fan 21 is located between the rotor 20b and the lower bearing 20e in the vertical direction. The cooling fan 21 rotates around the motor axis J together with the output shaft 20a by the drive of the electric motor 20. When the cooling fan 21 rotates, air flows from above to below. A plurality of intake holes 12c penetrating the bulge 12j in the horizontal direction are provided on the left and right side surfaces of the bulge 12j (see FIG. 1). A plurality of exhaust holes 16b penetrating the bracket 16 in the vertical direction and aligned in the circumferential direction along the inner surface 16c of the bracket 16 are provided in the lower part of the bracket 16 (see FIGS. 7 and 12). When the cooling fan 21 rotates, outside air is introduced into the motor housing 12 through the intake holes 12c. The introduced outside air flows downward and is discharged from the exhaust holes 16b to the outside of the main housing 11. The airflow cools the electric motor 20 and the controller 24 housed in the bulge 12j. Details of the controller 24 will be described later.

As shown in Figures 4 and 5, the output shaft 20a is inserted into a through hole 16a that passes through the center of the lower part of the bracket 16 in the vertical direction and protrudes downward. A roughly conical flange 17 is attached to the lower part of the bracket 16. The output shaft 20a protrudes downward beyond the flange 17. A cutting tool 22 that cuts the workpiece W by being driven by the electric motor 20 is attached to the tip of the output shaft 20a.

As shown in Figures 1 to 3, a battery attachment section 15 is provided on the upper part of the tool body 10, on the upper surface of the bulge 12j of the motor housing 12. A battery 23 is removably attached to the battery attachment section 15 as a power source. The battery 23 is a lithium-ion battery with multiple battery cells housed in a case, and can be used repeatedly by charging it with a separately prepared charger. The battery 23 is attached to the battery attachment section 15 by sliding it backward, and is removed from the battery attachment section 15 by sliding it forward. The battery 23 can be used as a power source for other rechargeable power tools such as a screwdriver or an electric drill.

As shown in Figures 4 and 5, a controller 24 for mainly controlling the operation of the electric motor 20 is installed in the bulge 12j of the motor housing 12 below the battery mounting portion 15. The controller 24 is a rectangular shallow case containing a control board and molded with resin, and has a roughly flat shape. The controller 24 is housed in the bulge 12j with its thickness direction in the up-down direction. The bottom surface of the controller 24 is located slightly above the intake hole 12c. The controller 24 is equipped with a control circuit consisting of a microcomputer, a drive circuit consisting of FETs, an auto-stop circuit, and the like. The control circuit transmits a control signal based on the rotational position information of the rotor 20b detected by the sensor board 20f. The drive circuit switches the current of the electric motor 20. The auto-stop circuit detects the power supply state of the battery 23 and cuts off the power supply to the electric motor 20 according to the detection result to prevent over-discharge or over-current.

As shown in Figures 1, 2 and 5, a switch panel 13 is provided on the rear surface of the bulge 12j of the motor housing 12. The switch panel 13 is provided with a standby switch 13a and a lock-on switch 13b that are operated by pressing. The standby switch 13a is turned on by pressing it once. When the standby switch 13a is turned on, the power working machine 1 transitions from a resting state to a standby state. In the standby state, power is supplied from the battery 23 to the controller 24. The lock-on switch 13b is turned on by pressing it once. When the lock-on switch 13b is turned on while the power working machine 1 is in the standby state, the power working machine 1 transitions to a driving state. In the driving state, power supply from the battery 23 to the electric motor 20 is maintained, and the driving of the electric motor 20 is maintained.

When the standby switch 13a or the lock-on switch 13b is pressed once while the power working machine 1 is in the driving state, the controller 24 stops the power supply from the battery 23 to the controller 24 and the electric motor 20, respectively. This causes the power working machine 1 to transition to a pause state. Also, when the lock-on switch 13b is not pressed for a predetermined time while the power working machine 1 is in the standby state, the controller 24 turns off the standby switch 13a. This causes the power working machine 1 to transition from the standby state to the pause state. A horizontally rotatable speed change dial 14 is provided on the left side of the bulge 12j. The rotation speed of the electric motor 20 can be adjusted by rotating the speed change dial 14. As described above, the controller 24, the electric motor 20, the switch panel 13, the speed change dial 14, and the light source device 30, which are electrically connected to the battery 23, are all attached to the motor housing 12. These electrical parts are not directly attached to the bracket 16.

5, 9, and 10, the light source device 30 for illuminating the peripheral area of the cutting tool 22 is installed in the front part of the motor housing 12. The light source device 30 is located below the stator 20c and above the cooling fan 21 in the vertical direction. The light source device 30 is formed in a substantially rectangular box shape. Two LEDs (light sources) 31 are housed side by side in the light source device 30 (see FIG. 11). The two LEDs 31 emit light downward. A lens capable of transmitting light emitted by the LEDs 31 is provided as a light emitting end surface 30a on the underside of the light source device 30. A wiring connection portion 30c that is electrically connected to each LED 31 and extends outward from the light source device 30 is provided on the upper part of the light source device 30. The wiring connection portion 30c is electrically connected to the wiring (lead wire) 25 that extends downward from the controller 24. The wiring 25 extends to the light source device 30 located above the cooling fan 21, and does not extend to, for example, the periphery of the cooling fan 21. The two LEDs 31 receive power from the battery 23 via the controller 24, the wiring 25, and the wiring connection part 30c. The two LEDs 31 receive power from the battery 23 and emit light when the power work machine 1 is in a standby state or a driving state.

As shown in Figures 6, 9, and 10, the left half 12a and the right half 12b are provided with a light source accommodating section 12d in the shape of a substantially rectangular box that accommodates approximately half of the light source device 30. The rear surface of the light source device 30 is provided with an engagement protrusion 30b that protrudes rearward. The rear surface of each of the left and right light source accommodating sections 12d is provided with a notch 12e. When the left half 12a and the right half 12b are engaged, the left and right light source accommodating sections 12d are adjacent to each other to form a box-shaped space. The light source device 30 is accommodated in the box-shaped space formed by the left and right light source accommodating sections 12d. The lower surfaces of the left and right light source accommodating sections 12d are open so as not to interfere with the light emitted downward by the light emitting end surface 30a. When the left half 12a and the right half 12b are engaged, the left and right cutout sections 12e are adjacent to each other to form a through hole. The engagement protrusions 30b of the light source device 30 are inserted into the through holes formed by the left and right cutouts 12e. The engagement between the left and right cutouts 12e and the engagement protrusions 30b holds the light source device 30 so that it does not fall out of the light source housing 12d. The light source device 30 is disposed near the outer periphery of the motor housing 12, where it is housed in the light source housing 12d and does not interfere with the flow of air generated by the cooling fan 21.

As shown in Figures 6, 9, and 10, the left half 12a and the right half 12b have a notch shape that extends linearly in the vertical direction below the light source housing section 12d. When the left half 12a and the right half 12b are engaged, the left and right notch shapes cooperate to form a groove 12f that extends in the vertical direction. The groove 12f is located on the radial outer periphery of the cooling fan 21 and extends beyond the cooling fan 21 in the vertical direction. A first light guiding rod 32 and a second light guiding rod 35, which will be described later, are inserted into the groove 12f.

As shown in Figures 4, 5, 9, and 10, the main housing 11 contains a first light guide rod 32 and a second light guide rod 35 that guide the light emitted by the two LEDs 31 to an irradiation area such as the periphery of the cutting tool tip 22. The first light guide rod 32 and the second light guide rod 35 are each formed as a single rod that extends in a columnar shape without branching. The first light guide rod 32 and the second light guide rod 35 are attached to the lower part of the bracket 16.

The first light guide rod 32 and the second light guide rod 35 are each formed of a single material having high light transmittance. The first light guide rod 32 and the second light guide rod 35 are preferably formed of a single material having high light transmittance, such as acrylic. The light transmittance per mm of the first light guide rod 32 is 80% or more, more preferably 85% or more, 90% or more, or 95% or more. The total length of the first light guide rod 32 is, for example, 20 mm or more, 30 mm or more, 40 mm or more, 50 mm or more, or 60 mm or more. The light transmittance per mm of the second light guide rod 35 is approximately the same as the light transmittance per mm of the first light guide rod 32, and is 80% or more, more preferably 85% or more, 90% or more, or 95% or more. The total length of the second light guide rod 35 is, for example, 20 mm or more, 30 mm or more, 40 mm or more, 50 mm or more, or 60 mm or more.

As shown in Figures 8 and 11, the first light guiding rod 32 has a first starting end face 32a and a first end face 32c at both ends of the columnar extension. The first starting end face 32a and the first end face 32c are each formed in a flat shape. The first starting end face 32a faces upward along the motor axis J, and the first end face 32c faces downward along the motor axis J. The first starting end face 32a and the first end face 32c are substantially circular with an outer periphery formed by a curved line without corners. The cross-sectional shape of the first light guiding rod 32 in a cross section perpendicular to the extension direction is substantially the same as the first starting end face 32a and the first end face 32c.

8, 11, and 12, the first light guide rod 32 has a first starting end 32b that extends a predetermined distance substantially perpendicularly from the first starting end surface 32a. The first light guide rod 32 includes a curved portion 33 that is curved between the first starting end surface 32a and the first terminal end surface 32c. The first light guide rod 32 is provided with three curved portions 33, namely, the first curved portion 33a, the second curved portion 33b, and the third curved portion 33c. The third curved portion 33c is provided below the first starting end 32b. The third curved portion 33c curves leftward from the direction along the motor axis J to the horizontal direction along the imaginary plane H perpendicular to the motor axis J. The first curved portion 33a is provided downstream of the third curved portion 33c. The first curved portion 33a curves along the imaginary plane H and so as to follow the inner peripheral surface 16c of the bracket 16. The first curved portion 33a extends counterclockwise over a length of approximately one-quarter of the circumference of the inner circumferential surface 16c (angle range of approximately 90°). The second curved portion 33b is provided between the first curved portion 33a and the first terminal surface 32c. The second curved portion 33b curves from a direction along the imaginary plane H to a substantially vertical direction along the motor axis J.

8 and 12, the first light guide rod 32 has a mounting seat 34 integrally formed from the same material. The mounting seat 34 is provided on a side surface 33d of the first curved portion 33a separated from the outer curved surface 33e of the first curved portion 33a. The side surface 33d is, for example, the inner curved surface 33f, the upper surface, and the lower surface of the first curved portion 33a. In this embodiment, the mounting seat 34 located on the inner curved surface 33f of the first curved portion 33a is illustrated. The mounting seat 34 is formed in a plate shape extending radially inward from the side surface 33d. A circular through hole 34a penetrating in the vertical direction is formed in the center of the mounting seat 34. A boss portion 16e provided to protrude upward from the lower surface of the bracket 16 is pressed into the through hole 34a. This fixes the first light guide rod 32 to the bracket 16.

As shown in Figures 8 and 11, the second light guide rod 35 is provided to the right of the first light guide rod 32 and is provided approximately symmetrically to the first light guide rod 32. The second light guide rod 35 has a second starting end face 35a and a second end face 35c formed in a flat shape at both ends of the rod-like extension. The second starting end face 35a faces upward along the motor axis J, and the second end face 35c faces downward along the motor axis J. The second starting end face 35a and the second end face 35c are approximately circular with an outer periphery formed by a curved line without corners. The cross-sectional shape of the second light guide rod 35 in a cross section perpendicular to the extension direction is approximately the same as the second starting end face 35a and the second end face 35c.

8, 11, and 12, the second light guide rod 35 has a second starting end 35b extending a predetermined distance substantially perpendicularly from the second starting end surface 35a. The second light guide rod 35 includes a curved portion 36 that is curved between the second starting end surface 35a and the second terminal end surface 35c. The second light guide rod 35 is provided with three curved portions 36, namely, the first curved portion 36a, the second curved portion 36b, and the third curved portion 36c. The third curved portion 36c is provided below the second starting end 35b. The third curved portion 36c curves to the right from the direction along the motor axis J to the horizontal direction along the imaginary plane H perpendicular to the motor axis J. The first curved portion 36a is provided downstream of the third curved portion 36c. The first curved portion 36a curves along the imaginary plane H and so as to follow the inner peripheral surface 16c of the bracket 16. The first curved portion 36a extends in the clockwise direction over a length of approximately one-quarter of the circumference of the inner circumferential surface 16c (angle range of approximately 90°). The second curved portion 36b is provided between the first curved portion 36a and the second terminal surface 35c. The second curved portion 36b curves from a direction along the imaginary plane H to a substantially vertical direction along the motor axis J.

8 and 12, the second light guide rod 35 has a mounting seat 37 integrally formed from the same material. The mounting seat 37 is provided on a side surface 36d of the first curved portion 36a separated from the outer curved surface 36e of the first curved portion 36a. The side surface 36d is, for example, the inner curved surface 36f, the upper surface, and the lower surface of the first curved portion 36a. In this embodiment, the mounting seat 37 located on the inner curved surface 36f of the first curved portion 36a is illustrated. The mounting seat 37 is formed in a plate shape extending radially inward from the side surface 36d. A circular through hole 37a penetrating in the vertical direction is formed in the center of the mounting seat 37. A boss portion 16e provided to protrude upward from the lower surface of the bracket 16 is pressed into the through hole 37a. This fixes the second light guide rod 35 to the bracket 16.

As shown in Figures 8, 11, and 12, the first starting end 32b of the first light guiding rod 32 and the second starting end 35b of the second light guiding rod 35 are joined together in a horizontal line. As a result, the first light guiding rod 32 and the second light guiding rod 35 are integrally formed as a light guiding rod connector 38. By providing the light guiding rod connector 38 as an integral part, the mounting base 34 also acts as a member for fixing the second light guiding rod 35 to the bracket 16, and the mounting base 37 also acts as a member for fixing the first light guiding rod 32 to the bracket 16. This improves the stability with which the bracket 16 supports the first light guiding rod 32 and the second light guiding rod 35.

As shown in FIG. 11, the first starting end surface 32a and the second starting end surface 35a are adjacent to each other and are arranged to face the light emitting end surface 30a at approximately the same height. When the light source device 30 is assembled to the motor housing 12 and the first light guiding rod 32 is assembled to the bracket 16, a first space S1 is provided between the first starting end surface 32a and the light emitting end surface 30a. The first starting end surface 32a is located approximately directly below one LED 31. When the light source device 30 is assembled to the motor housing 12 and the second light guiding rod 35 is assembled to the bracket 16, a second space S2 is provided between the second starting end surface 35a and the light emitting end surface 30a. The second starting end surface 35a is located approximately directly below one LED 31. The vertical length of the first space S1 and the second space S2 is, for example, 10 mm or less, 5 mm or less, for example, 1 mm, 2 mm, or 3 mm.

As shown in FIG. 7, the first end surface 32c is exposed downward in one of the exhaust holes 16b provided on the left side of the bracket 16. The second end surface 35c is exposed downward in one of the exhaust holes 16b provided on the right side of the bracket 16. The first end surface 32c and the second end surface 35c are disposed at positions approximately symmetrical on the left and right sides with respect to the output shaft 20a. The light emitted from the first end surface 32c and the second end surface 35c illuminates the tip cutting tool 22 and the periphery of the through hole 2a of the base 2 (see FIG. 1).

Figure 11 shows a schematic diagram of the path of light passing through the first light guide rod 32. Note that the light passing through the second light guide rod 35 is omitted from the illustration because it is approximately symmetrical to the first light guide rod 32. The light emitted by the LED 31 and emitted downward from the light emitting end face 30a enters the first light guide rod 32 from the first starting end face 32a. The light travels through the first starting end 32b, the third curved portion 33c, the first curved portion 33a, and the second curved portion 33b in order while being totally reflected by the wall surface in the first light guide rod 32, and is irradiated downward from the first end face 32c. Each curved portion 33 is formed with a curvature such that the light is totally reflected without leaking from the wall surface. In each curved portion 33, the light is mainly totally reflected by the outer peripheral curved surface 33e (see Figure 8). Therefore, the light is prevented from entering the mounting seat 34 provided on the side surface 33d separated from the outer peripheral curved surface 33e.

As described above, the power work machine 1 has an LED 31 housed in the main housing 11 as shown in Figures 9 and 10. The power work machine 1 has a first light guide rod 32 that has a first starting end surface 32a facing the LED 31 and guides light incident from the first starting end surface 32a to a first end surface 32c and irradiates the light from the first end surface 32c. The power work machine 1 has a second light guide rod 35 that has a second starting end surface 35a facing the LED 31 and guides light incident from the second starting end surface 35a to a second end surface 35c and irradiates the light from the second end surface 35c.

Therefore, the light emitted from the LED 31 enters directly into the first light guide rod 32 from the first starting end face 32a, and directly into the second light guide rod 35 from the second starting end face 35a. The first light guide rod 32 is provided without branching from the first starting end face 32a, which is the light receiving surface, to the first end face 32c, which is the light emitting surface. The second light guide rod 35 is provided without branching from the second starting end face 35a, which is the light receiving surface, to the second end face 35c, which is the light emitting surface. This makes it possible to suppress the loss of light from the first starting end face 32a to the first end face 32c, and also to suppress the loss of light from the second starting end face 35a to the second end face 35c. Moreover, the irradiation area can be illuminated from two places, the first end face 32c and the second end face 35c. In this way, the loss of light passing through the first light guide rod 32 and the second light guide rod 35 can be suppressed, and the irradiation area can be brightly illuminated.

In addition, the first light guiding rod 32 and the second light guiding rod 35 can be provided with independent shapes. This increases the degree of freedom in the shape and mounting posture of the first light guiding rod 32 and the second light guiding rod 35. This allows the first light guiding rod 32 and the second light guiding rod 35 to be arranged in a limited space within the main housing 11, and also suppresses increases in the cost of the molds for forming the first light guiding rod 32 and the second light guiding rod 35. In addition, since the number of LEDs 31 can be reduced, the main housing 11 can be made more compact.

As shown in FIG. 8, at least one of the first light guide rod 32 and the second light guide rod 35 includes a curved portion 33, 36 that is columnar over the entire length and at least a portion of which is curved. Therefore, by providing the curved portion 33, 36, the degree of freedom in the arrangement and orientation of the first starting end face 32a and the second starting end face 35a is increased, and the degree of freedom in the arrangement and orientation of the first end face 32c and the second end face 35c is also increased. Therefore, it is easy to respond to changes in the arrangement of the first starting end face 32a, the second starting end face 35a, and the LED 31 without increasing the size of the first light guide rod 32 and the second light guide rod 35. In addition, it is easy to respond to design changes in the distance to the irradiation area of the first end face 32c and the second end face 35c, and the irradiation angle, without increasing the size of the first light guide rod 32 and the second light guide rod 35.

As shown in Figures 9 and 10, the main housing 11 is cylindrical so as to accommodate the electric motor 20 (see Figures 4 to 6). The curved portions 33, 36 of the first light guiding rod 32 or the second light guiding rod 35 extend circumferentially along the inner peripheral surface 16c of the main housing 11. Therefore, the first light guiding rod 32 or the second light guiding rod 35 can be accommodated within the main housing 11 while preventing the main housing 11 from becoming too large.

As shown in Figures 4, 5, and 11, the power work machine 1 has an electric motor 20 housed in the main body housing 11. The curved portion 33, 36 of the first light guide rod 32 or the second light guide rod 35 includes a first curved portion 33a, 36a that curves along an imaginary plane H perpendicular to the motor axis J of the electric motor 20, and a second curved portion 33b, 36b that curves from the imaginary plane H in a direction along the motor axis J. Therefore, the first curved portion 33a, 36a can be housed in the main body housing 11 by utilizing the shape that houses the electric motor 20 without increasing the size of the main body housing 11. In addition, the second curved portion 33b, 36b can be housed in the main body housing 11 by utilizing the shape that houses the output shaft 20a extending in the direction of the motor axis J without increasing the size of the main body housing 11. In this way, the size of the main body housing 11 can be suppressed.

As shown in Figures 8 to 10, the first light guide rod 32 or the second light guide rod 35 has mounting seats 34, 37 that are attached to the main housing 11. The mounting seats 34, 37 are provided on the side surfaces 33d, 36d of the curved portions 33, 36 that are spaced apart from the outer circumferential curved surfaces 33e, 36e of the curved portions 33, 36. Therefore, the mounting seats 34, 37 can be provided at locations spaced apart from the light path. The outer circumferential curved surfaces 33e, 36e are located on the light path as reflective surfaces for the light traveling through the first light guide rod 32 and the second light guide rod 35. If the mounting seats 34, 37 are provided on the outer circumferential curved surfaces 33e, 36e, the light is likely to enter the mounting seats 34, 37 from the outer circumferential curved surfaces 33e, 36e. This results in a loss of light. By separating the mounting seats 34, 37 from the outer circumferential curved surfaces 33e, 36e on the light path, the loss of light can be suppressed.

As shown in FIG. 11, a first space S1 is provided between the light emitting end surface 30a of the light source device 30 including the LED 31 and the first starting end surface 32a of the first light guide rod 32. A second space S2 is provided between the light emitting end surface 30a of the light source device 30 and the second starting end surface 35a of the second light guide rod 35. Therefore, when the power work machine 1 is assembled or vibration occurs during operation, the light emitting end surface 30a, the first starting end surface 32a, and the second starting end surface 35a can be prevented from being damaged. This can prevent the light transmittance of the first light guide rod 32, the second light guide rod 35, and the light emitting end surface 30a from being reduced. In addition, by ensuring the first space S1 and the second space S2, there are fewer restrictions on the shape of the light source device 30. Therefore, a general-purpose light source device 30 can be used.

As shown in Figures 5, 9, and 10, the main housing 11 includes a motor housing 12 and a bracket 16 that are assembled together. The LED 31 is attached to the motor housing 12. The first light guiding rod 32 and the second light guiding rod 35 are attached to the bracket 16. Therefore, by assembling the motor housing 12 and the bracket 16 together, the LED 31, the first light guiding rod 32, and the second light guiding rod 35 can be positioned relative to each other without adjustment. This improves the ease of assembly of the LED 31, the first light guiding rod 32, and the second light guiding rod 35.

As shown in FIG. 5, the motor housing 12 is fitted with a battery (power source) 23, wiring 25 extending from the battery 23, and an LED 31 connected to the wiring 25. No electrical components connected to the wiring 25 are provided on the bracket 16. Therefore, by gathering the electrical components including the LED 31 on the motor housing 12 side, it is not necessary to provide the wiring 25 on the bracket 16. Therefore, first, the electrical components including the LED 31 and the wiring 25 are assembled to the motor housing 12, and the first light guiding rod 32 and second light guiding rod 35 are assembled to the bracket 16. After that, the motor housing 12 and bracket 16 are assembled to each other. This improves the ease of assembly of the main housing 11.

As shown in Figures 4 and 5, the power work machine 1 has an electric motor 20 housed in the main housing 11. The power work machine 1 has an output shaft 20a extending from the electric motor 20. The power work machine 1 has a cooling fan 21 that rotates by the output shaft 20a and generates air to cool the electric motor 20. An LED 31 is disposed between the electric motor 20 and the cooling fan 21 and within the main housing 11. Therefore, the LED 31 is housed in the empty space between the electric motor 20 and the cooling fan 21, and is disposed closer to the battery 23 electrically connected to the electric motor 20 than the cooling fan 21. Therefore, it is possible to prevent the wiring 25 that supplies power to the LED 31 from being disposed near the cooling fan 21. This makes it possible to prevent the main housing 11 from becoming larger around the cooling fan 21.

As shown in Figures 5, 6, 9, and 10, a groove 12f extending beyond the cooling fan 21 is provided on the inner peripheral surface 16c of the main housing 11 facing the cooling fan 21. The first light guide rod 32 and the second light guide rod 35 are inserted into the groove 12f. Therefore, the first light guide rod 32 and the second light guide rod 35 can be arranged across the radial outside of the cooling fan 21 while preventing the main housing 11 from becoming larger. In addition, the region close to the first starting end surface 32a of the first light guide rod 32 and the region close to the second starting end surface 35a of the second light guide rod 35 can be positioned by the groove 12f. Therefore, the assembly of the first light guide rod 32 and the second light guide rod 35 can be improved.

As shown in Figures 8 and 11, the first starting end face 32a of the first light guiding rod 32 and the second starting end face 35a of the second light guiding rod 35 are adjacent to each other and are located on the same imaginary plane or parallel to each other. The first end face 32c of the first light guiding rod 32 and the second end face 35c of the second light guiding rod 35 are spaced apart from each other. Therefore, the first starting end face 32a and the second starting end face 35a can be arranged together near the LED 31 provided in one location. This makes it possible to make the area around the LED 31 compact. In addition, by spacing the first end face 32c and the second end face 35c apart from each other, it is possible to suppress the occurrence of shadows in the illuminated area. This makes it possible to improve the visibility of the illuminated area.

As shown in Figures 8 and 11, the first starting end 32b of the first light guiding rod 32, including the first starting end surface 32a, and the second starting end 35b of the second light guiding rod 35, including the second starting end surface 35a, are joined together side-by-side. Therefore, by reducing the number of parts, the number of dies for forming the first light guiding rod 32 and the second light guiding rod 35 can be reduced. This reduces manufacturing costs. In addition, the effort required to adjust the relative positions of the first light guiding rod 32 and the second light guiding rod 35 during assembly can be reduced. This improves the ease of assembly of the first light guiding rod 32 and the second light guiding rod 35.

As shown in Figures 8 and 11, the first light guiding rod 32 and the second light guiding rod 35 are formed from a single material with a light transmittance of 80% or more per mm. Therefore, due to the high light transmittance, it is possible to reduce the loss of light from the first starting end face 32a to the first end face 32c of the first light guiding rod 32, and from the second starting end face 35a to the second end face 35c of the second light guiding rod 35. Furthermore, by forming them from a single material, manufacturing costs can be reduced, and the light path can be easily simulated, making it easy to respond to design changes.

As shown in FIG. 10, the power working machine 1 has a light source 31 housed in the main housing 11. The power working machine 1 has a first light guide rod 32 that has a first starting end surface 32a facing the light source 31 and guides light incident from the first starting end surface 32a to a first end surface 32c and irradiates the light from the first end surface 32c. The main housing 11 is cylindrical to house the electric motor 20 and includes a motor housing 12 and a bracket 16 that are assembled to each other. The first light guide rod 32 is columnar over its entire length and includes a curved portion 33 that is at least partially curved. The curved portion 33 of the first light guide rod 32 extends circumferentially along the inner peripheral surface 16c of the main housing 11. The light source 31 is attached to the motor housing 12, and the first light guide rod 32 is attached to the bracket 16. A first space S1 is provided between the light emitting end surface 30a of the light source device 30 including the light source 31 and the first end surface 32a of the first light guiding rod 32 (see FIG. 11).

Therefore, the light emitted from the light source 31 directly enters the first light guide rod 32 from the first starting end surface 32a and is sent to the first end surface 32c through the first light guide rod 32 that does not branch. Therefore, the loss of light from the first starting end surface 32a to the first end surface 32c can be suppressed. By providing the curved portion 33, the arrangement and orientation of the first starting end surface 32a and the first end surface 32c can be freely changed without increasing the size of the first light guide rod 32. By aligning the curved portion 33 with the inner peripheral surface 16c, the first light guide rod 32 can be accommodated in the main housing 11 while suppressing the increase in size of the main housing 11. By assembling the motor housing 12 and the bracket 16 to each other, the light source 31 and the first light guide rod 32 can be positioned relative to each other without adjustment. Therefore, the assembling property of the light source 31 and the first light guide rod 32 can be improved. By providing the first space S1, it is possible to prevent the light emitting end surface 30a and the first starting end surface 32a from being damaged when the power work machine 1 is assembled or vibrated during operation. This prevents the light transmittance of the first light guide rod 32 and the light emitting end surface 30a from being reduced. In addition, by providing the first space S1, there are fewer restrictions on the shape of the light source device 30. Therefore, a general-purpose light source device 30 can be used.

Next, a second embodiment of the present disclosure will be described with reference to Figures 13 and 14. The power working machine 40 of the second embodiment has a first light guiding rod 41 and a second light guiding rod 44 shown in Figures 13 and 14, instead of the first light guiding rod 32 and the second light guiding rod 35 of the first embodiment shown in Figure 8. In the following description, only the configuration that differs from the first embodiment will be described in detail.

The first light guiding rod 41 and the second light guiding rod 44 shown in Figures 13 and 14 are formed of a single material, colorless acrylic, which has high light transmittance. The light transmittance per mm of the first light guiding rod 41 and the second light guiding rod 44 is 80% or more, and more preferably 85% or more, 90% or more, or 95% or more. The total length of the first light guiding rod 41 is, for example, 20 mm or more, 30 mm or more, 40 mm or more, 50 mm or more, or 60 mm or more. The total length of the second light guiding rod 44 is, for example, 20 mm or more, 30 mm or more, 40 mm or more, 50 mm or more, or 60 mm or more. The second light guiding rod 44 is provided longer than the first light guiding rod 41.

As shown in Figures 13 and 14, the first light guiding rod 41 is generally configured in the same manner as the first light guiding rod 32 (see Figure 8). The first light guiding rod 41 has a first starting end face 41a and a first end face 41c that are planar and substantially circular at both ends. The first starting end face 41a faces upward, and the first end face 41c faces downward. Between the first starting end face 41a and the first end face 41c, in order from the first starting end face 41a, there are provided a first starting end 41b, a third curved portion 42c, a first curved portion 42a, and a second curved portion 42b. The first curved portion 42a, the second curved portion 42b, and the third curved portion 42c correspond to the curved portion 42 in the first light guiding rod 41.

As shown in Figures 13 and 14, the first starting end 41b extends a predetermined distance substantially perpendicularly from the first starting end surface 41a. The third curved portion 42c curves leftward from a substantially vertical direction to a horizontal direction. The first curved portion 42a curves along the imaginary plane H and follows the inner peripheral surface 16c of the bracket 16 (see Figures 11 and 12). The first curved portion 42a extends counterclockwise for a length of approximately one-sixth of the circumference of the inner peripheral surface 16c (angle range of approximately 60°). The second curved portion 42b curves from a horizontal direction to a substantially vertical direction.

As shown in Figures 13 and 14, the first light guiding rod 41 has a mounting seat 43 that is integrally formed from the same material. The mounting seat 43 is provided on the side surface 42d (inner curved portion 42f) of the first curved portion 42a that is spaced from the outer curved surface 42e of the first curved portion 42a. The mounting seat 43 is formed in a plate shape that extends radially inward from the side surface 42d. A circular through hole 43a that penetrates in the vertical direction is formed in the center of the mounting seat 43.

As shown in Figures 13 and 14, the second light guide rod 44 is provided to the right of the first light guide rod 41 and is configured in a manner similar to the second light guide rod 35 (see Figure 8). The second light guide rod 44 has a planar and substantially circular second starting end face 44a and a second end face 44c at both ends. The second starting end face 44a faces upward, and the second end face 44c faces downward. Between the second starting end face 44a and the second end face 44c, the second starting end face 44b, the third curved portion 45c, the first curved portion 45a, and the second curved portion 45b are provided in this order from the second starting end face 44a. The first curved portion 45a, the second curved portion 45b, and the third curved portion 45c correspond to the curved portion 45 in the second light guide rod 44.

As shown in Figures 13 and 14, the second starting end 44b extends a predetermined distance substantially perpendicularly from the second starting end surface 44a. The third curved portion 45c curves to the right from a substantially vertical direction to a horizontal direction. The first curved portion 45a curves along the imaginary plane H and follows the inner peripheral surface 16c of the bracket 16 (see Figures 11 and 12). The first curved portion 45a extends in the counterclockwise direction for a length of approximately one-third of the circumference of the inner peripheral surface 16c (angle range of approximately 120°). The second curved portion 45b curves from the horizontal direction to a substantially vertical direction.

As shown in Figures 13 and 14, the second light guiding rod 44 has a mounting seat 46 that is integrally formed from the same material. The mounting seat 46 is provided on the side surface 45d (inner curved portion 45f) of the first curved portion 45a that is spaced from the outer curved surface 45e of the first curved portion 45a. The mounting seat 46 is formed in a plate shape that extends radially inward from the side surface 45d. A circular through hole 46a that penetrates in the vertical direction is formed in the center of the mounting seat 46.

13 and 14, the first end 41b of the first light guide rod 41 and the second end 44b of the second light guide rod 44 are joined together in a horizontal line. As a result, the first light guide rod 41 and the second light guide rod 44 are integrally formed as a light guide rod joint 47. The first end face 41a and the second end face 44a are arranged so as to be adjacent to each other and to face the light emitting end face 30a (see FIG. 11) at approximately the same height. A space is provided between the first end face 41a and the light emitting end face 30a, and between the second end face 44a and the light emitting end face 30a. The first end face 41c is exposed downward in one of the exhaust holes 16b provided on the left side of the bracket 16 (see FIG. 7). The second end face 44c is exposed downward in one of the exhaust holes 16b provided on the right side of the bracket 16. The first end surface 41c is positioned forward of the second end surface 44c. With this configuration, the first light guide rod 32 and the second light guide rod 35 of the first embodiment can illuminate the area around the tip cutting tool 22 and the through hole 2a of the base 2 (see FIG. 1) with the bright areas shifted from each other.

Next, an experiment comparing the brightness of the illumination area between the first embodiment and the comparative example will be described with reference to Figs. 15 to 18. In the comparative example, a light guide rod 50 was used instead of the first light guide rod 32 and the second light guide rod 35 of the first embodiment shown in Fig. 8. The light guide rod 50 is formed as a single material of the same material as the first light guide rod 32 and the second light guide rod 35. The light guide rod 50 has a planar and approximately circular starting end surface 50a at the starting end side and a linearly extending starting end surface 50b, and has two planar and approximately circular end surfaces 51a and 54a at the end side. The starting end surface 50a faces upward, and the end surfaces 51a and 54a face downward. The light guide rod 50 branches into a first branch portion 51 toward the end surface 51a and a second branch portion 54 toward the end surface 54a at the lower end of the starting end portion 50b.

15 and 16, the first branch 51 has two orthogonal portions 52: a first orthogonal portion 52a extending generally orthogonally to the left relative to the lower end of the starting end 50b, and a second orthogonal portion 52b extending generally orthogonally downward relative to the tip of the first orthogonal portion 52a. The first orthogonal portion 52a is curved to follow the inner peripheral surface 16c of the bracket 16 (see FIG. 12), and extends counterclockwise for a length of approximately one-quarter of the circumference of the inner peripheral surface 16c (angle range of approximately 90°). A mounting seat 53 protruding radially inward and having a through hole 53a is provided on the side surface 52c of the first orthogonal portion 52a. A terminal surface 51a is provided at the lower end of the second orthogonal portion 52b. The terminal surface 51a is disposed at approximately the same position as the first terminal surface 32c shown in FIG. 7.

15 and 16, the second branch 54 has two orthogonal portions 55: a first orthogonal portion 55a extending to the right at a right angle relative to the lower end of the starting end 50b, and a second orthogonal portion 55b extending downward at a right angle relative to the tip of the first orthogonal portion 55a. The first orthogonal portion 55a is curved to follow the inner peripheral surface 16c of the bracket 16 (see FIG. 12), and extends in the clockwise direction for a length of approximately one-quarter of the circumference of the inner peripheral surface 16c (angle range of approximately 90°). A mounting seat 56 protruding radially inward and having a through hole 56a is provided on the side surface 55c of the first orthogonal portion 55a. A terminal surface 54a is provided at the lower end of the second orthogonal portion 55b. The terminal surface 54a is disposed at approximately the same position as the second terminal surface 35c shown in FIG. 7.

Figure 15 shows a schematic diagram of the path of light passing through the light guide rod 50. The light passing through the second branch 54 is omitted because it is approximately symmetrical to the first branch 51. The light emitted from the LED 31 (see Figure 11) enters the starting end 50b from the starting end surface 50a. At the branching portion where the first branch 51 and the second branch 54 are separated, some of the light leaks out of the light guide rod 50 without being totally reflected by the wall surface of the branching portion. In addition, at the orthogonal portion where the first orthogonal portions 52a, 55a and the second orthogonal portions 52b, 55b are connected, some of the light may leak out of the light guide rod 50. Therefore, the loss of the amount of light in the path from the starting end surface 50a to the terminal ends 51a, 54a is large.

Figure 17 shows the illumination area on the underside of the base 2 when the first light guide rod 32 and the second light guide rod 35 (see Figure 11) of the first embodiment of the present disclosure are used. The light passes through both the central through hole 2a and the multiple surrounding through holes 2b to illuminate the downward direction. Therefore, the outlines of all the through holes 2a and the multiple through holes 2b are clearly visible, and the illumination is wide and bright. Figure 18 shows the illumination area on the underside of the base 2 when the light guide rod 50 of the comparative example is used. The light passes through the central through hole 2a and some of the multiple through holes 2b to illuminate the downward direction. Only the outlines of the through hole 2a and some of the multiple through holes 2b can be confirmed, and the entire outlines of the through holes 2a and 2b cannot be seen, and only some of the outlines remain. Therefore, the illumination range is narrow and the amount of light is small. By comparing Figures 17 and 18, it can be seen that there is a large difference in the amount of light between the light that passes through the first light guide rod 32 and the second light guide rod 35 and the light that passes through the light guide rod 50.

Various modifications can be made to the embodiments of the present disclosure described above. A power tool 1 called a router has been exemplified. Alternatively, the present invention may be applied to power tools such as trimmers, screwdrivers, electric drills, and reciprocating saws, air tools such as compressed air nail guns, and gardening tools such as lawnmowers. Although an example has been given in which two light guide rods, the first light guide rod 32 and the second light guide rod 35, are provided, three or more light guide rods may be provided. An example has been given in which the light source device 30 is provided with two LEDs. Alternatively, the light source device 30 may be provided with only one LED or three or more LEDs.

The first light guiding rod 32 and the second light guiding rod 35 are shown as being made of acrylic, which has a high light transmittance. Alternatively, they may be made of other resin materials with a high light transmittance, such as polycarbonate or polystyrene, or may be made of a non-resin material with a high light transmittance. The cross-sectional shapes of the start and end faces and middle parts of the first light guiding rod 32 and the second light guiding rod 35 may be, for example, elliptical or oval, instead of the approximate circle shown as an example.

The first light guide rod 32 and the second light guide rod 35 are exemplified in which the first starting end surface 32a and the second starting end surface 35a face upward, and the third curved portions 33c and 36c curve from the vertical extension direction to the horizontal direction. Alternatively, for example, the first starting end surface 32a and the second starting end surface 35a may face outward on the imaginary plane H shown in FIG. 11, and the third curved portions 33c and 36c may curve horizontally on the imaginary plane H. In such a configuration, the light source device 30 is located outward of the first starting end surface 32a and the second starting end surface 35a on the imaginary plane H.

The first light guiding rod 32 and the second light guiding rod 35 are exemplified in such a way that the starting and ending faces are planar. Alternatively, for example, the starting and ending faces, or both, may be formed as convex or concave lens surfaces. The first light guiding rod 32 and the second light guiding rod 35 are fixed to the bracket 16 by pressing the boss portion 16e of the bracket 16 into the through holes 34a, 37a of the mounting seats 34, 37. Alternatively, the first light guiding rod 32 and the second light guiding rod 35 may be fixed to the bracket 16 by, for example, screw fastening.

1...Power working machine (first embodiment)
2...base, 2a, 2b...through hole 3...main body support portion, 3a...base connecting portion, 3b...cylindrical portion, 3c...window portion 3d...grip support portion, 3e...window portion 4...lock lever 5...height adjustment dial, 5a...spiral convex portion 6...grip, 6a...arm portion, 6b...holding portion 10...tool main body 11...main body housing 12...motor housing (first housing), 12a...left half portion, 12b...right half portion 12c...air intake hole, 12d...light source accommodating portion, 12e...notch portion, 12f...groove 12g...left and right connecting portion, 12h...recess, 12i...cylindrical portion, 12j...bulge portion 13...switch panel, 13a...waiting switch, 13b...lock-on switch 14...speed change dial 15...battery attachment portion 16...bracket (second housing), 16a...through hole, 16b...exhaust hole 16c...inner peripheral surface, 16d...spiral recess, 16e...boss portion, 16f...recess 17...flange 20...electric motor, 20a...output shaft, 20b...rotor, 20c...stator 20d, 20e...bearing, 20f...sensor board 21...cooling fan 22...tip cutting tool 23...battery 24...controller 25...wiring 30...light source device, 30a...light emitting end surface, 30b...engagement protrusion, 30c...wiring connection portion 31...LED (light source)
32...First light guiding rod, 32a...First starting end surface, 32b...First starting end, 32c...First end surface 33...Curved portion, 33a...First curved portion, 33b...Second curved portion, 33c...Third curved portion 33d...Side surface, 33e...Outer curved surface, 33f...Inner curved surface 34...Mounting seat, 34a...Through hole 35...Second light guiding rod, 35a...Second starting end surface, 35b...Second starting end, 35c...Second end surface 36...Curved portion, 36a...First curved portion, 36b...Second curved portion, 36c...Third curved portion 36d...Side surface, 36e...Outer curved surface, 36f...Inner curved surface 37...Mounting seat, 37a...Through hole 38...Light guiding rod connector 40...Power work machine (Second embodiment)
41...First light guiding rod, 41a...First starting end surface, 41b...First starting end, 41c...First end surface 42...Curved portion, 42a...First curved portion, 42b...Second curved portion, 42c...Third curved portion 42d...Side surface, 42e...Outer curved surface, 42f...Inner curved surface 43...Mounting seat, 43a...Through hole 44...Second light guiding rod, 44a...Second starting end surface, 44b...Second starting end, 44c...Second end surface 45...Curved portion, 45a...First curved portion, 45b...Second curved portion, 45c...Third curved portion 45d...Side surface, 45e...Outer curved surface, 45f...Inner Circumferential curved surface 46...mounting seat, 46a...through hole 47...light guide rod connecting body 50...light guide rod, 50a...starting end surface, 50b...starting end 51...first branching portion, 51a...terminal end surface 52...orthogonal portion, 52a...first orthogonal portion, 52b...second orthogonal portion, 52c...side surface 53...mounting seat, 53a...through hole 54...second branching portion, 54a...terminal end surface 55...orthogonal portion, 55a...first orthogonal portion, 55b...second orthogonal portion, 55c...side surface 56...mounting seat, 56a...through hole W...workpiece J...motor axis H...imaginary plane S1...first space, S2...second space

Claims (14)

A power working machine,
a light source accommodated in a main body housing;
A first light guiding rod having a first end surface facing the light source and guiding light incident from the first end surface to a first end surface to irradiate the light from the first end surface;
A power working machine having a second light guiding rod which is provided with a second starting end surface facing the light source and which guides light incident from the second starting end surface to a second terminal end surface and irradiates the light from the second terminal end surface. 2. The power working machine according to claim 1,
At least one of the first light guiding rod and the second light guiding rod is columnar over its entire length and includes a curved portion that is at least partially curved. The power working machine according to claim 2,
The main body housing is cylindrical so as to accommodate an electric motor,
A power working machine, wherein the curved portion of the first light guiding rod or the second light guiding rod extends circumferentially along an inner circumferential surface of the main body housing. A power working machine according to claim 2 or 3,
an electric motor accommodated in the main body housing;
A power working machine, wherein the curved portion of the first light guiding rod or the second light guiding rod includes a first curved portion curved along an imaginary plane perpendicular to the motor axis of the electric motor, and a second curved portion curved from the imaginary plane in a direction along the motor axis. A power working machine according to any one of claims 2 to 4,
the first light guide rod or the second light guide rod has a mounting seat to be attached to the main body housing,
The mounting seat is provided on a side surface of the curved portion spaced apart from an outer circumferential curved surface of the curved portion. A power working machine according to any one of claims 1 to 5,
A first space is provided between a light emitting end surface of a light source device including the light source and the first end surface of the first light guiding rod,
A power working machine, wherein a second space is provided between the light emitting end surface of the light source device and the second starting end surface of the second light guiding rod. A power working machine according to any one of claims 1 to 6,
The main body housing includes a first housing and a second housing that are assembled to each other,
The light source is attached to the first housing, and the first light guide rod and the second light guide rod are attached to the second housing. A power working machine according to claim 7,
A power source, wiring extending from the power source, and the light source connected to the wiring are attached to the first housing,
The second housing has no electrical components connected to the wiring. A power working machine according to any one of claims 1 to 8,
an electric motor accommodated in the main body housing;
an output shaft extending from the electric motor;
a cooling fan that is rotated by the output shaft to generate air for cooling the electric motor;
The light source is disposed between the electric motor and the cooling fan and within the main body housing. A power working machine according to claim 9,
A groove extending beyond the cooling fan is provided on the inner surface of the main housing facing the cooling fan, and the first light guiding rod and/or the second light guiding rod are inserted into the groove. A power working machine according to any one of claims 1 to 10,
The first end surface of the first light guiding rod and the second end surface of the second light guiding rod are adjacent to each other and are located on the same virtual plane or parallel to each other;
A power working machine, wherein the first end surface of the first light guiding rod and the second end surface of the second light guiding rod are spaced apart from each other. A power working machine according to claim 11,
A power working machine in which a first starting end portion of the first light guiding rod including the first starting end surface and a second starting end portion of the second light guiding rod including the second starting end surface are integrally connected side by side. A power working machine according to any one of claims 1 to 12,
A power working machine, wherein the first light guiding rod and the second light guiding rod are formed from a single material having a light transmittance of 80% or more per mm. A power working machine,
a light source accommodated in a main body housing;
A first light guiding rod is provided with a first end surface facing the light source, and guides light incident from the first end surface to a first end surface to irradiate the light from the first end surface,
The main body housing is cylindrical so as to accommodate the electric motor, and includes a first housing and a second housing which are assembled to each other.
The first light guiding rod is columnar over its entire length and includes a curved portion that is at least partially curved,
The curved portion of the first light guiding rod extends in a circumferential direction along an inner circumferential surface of the main housing,
the light source is attached to the first housing, and the first light guide is attached to the second housing;
A power working machine, in which a first space is provided between a light emitting end surface of a light source device including the light source and the first starting end surface of the first light guiding rod.

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