Shadowless lighting system for hand-held power tool

Abstract

An example power tool includes a main housing. The motor may be located within the main housing. The power tool may further include a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool. The power tool may further include a secondary housing in which at least a portion of the transmission mechanism is located. The power tool may further include a light source mounted to the front end of the secondary housing. The power tool may include one or more electrical wires extending through the channel and electrically connected to the light source.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to co-pending U.S. Provisional Application No. 63 / 321,896 filed on March 21, 2022 and co-pending U.S. Provisional Application No. 63 / 278,719 filed on November 12, 2021, the entire contents of both provisional applications are incorporated herein by reference. Technical Field

[0003] Some disclosed embodiments relate to a handheld power tool including a lighting assembly. In particular, some disclosed embodiments relate to a handheld power tool including a shadowless lighting system. Utility Model Content

[0004] The handheld power tool may include one or more work lights configured to illuminate a working area of ​​the power tool. For example, the power tool may include a single work light positioned near an output unit of the power tool to illuminate an area over which the output unit provides output, such as drilling into a workpiece, securing a fastener in a workpiece, etc.

[0005] Some power tools may include a work light located on the front surface of the power tool that is configured to illuminate the working area of ​​the power tool. For example, a high-torque impact wrench may include a single light-emitting diode (LED) positioned near an output unit that is configured to transfer rotational energy from the high-torque impact wrench to a fastener. When a user operates the high-torque impact wrench, the LED may illuminate the fastener so that the user can see the fastener more easily. However, the use of a single LED may cause the output unit to cast a shadow, which may have a negative impact on the visibility of the fastener. To address this issue, the power tool may include a plurality of LEDs positioned radially around the output unit or end tool of the power tool. Arranging a plurality of LEDs around the output unit achieves uniform illumination of all sides of the output unit or end tool, which prevents shadows from being cast. This type of lighting may generally be referred to as shadowless lighting.

[0006] Although shadowless lighting helps improve visibility of fasteners, implementing shadowless lighting in a power tool (e.g., on the front surface of a hammer head case) may cause other problems. For example, each LED mounted to the front surface of the power tool may require multiple wires to provide power and / or control signals to the LEDs. As more LEDs are included, more wires may be required. Therefore, power tools that implement shadowless lighting require an effective method to position these wires in the limited space provided within the handheld power tool.

[0007] One embodiment provides a power tool that may include a main housing. The motor may be located in the main housing. The power tool may further include a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool. The power tool may further include a secondary housing in which at least a portion of the transmission mechanism is located. The secondary housing may include an outer peripheral surface and a protrusion protruding outward from the outer peripheral surface. The power tool may further include a light source mounted to the front end of the secondary housing. The power tool may further include a channel passing through the secondary housing. The channel may include a first end located at the front end of the secondary housing and a second end located at the rear end of the secondary housing. At least a portion of the channel may be located in the protrusion. The power tool may include one or more wires electrically connected to the light source. The one or more wires may extend through the channel. The second end of the channel may be open to the interior of the main housing to guide the one or more wires into the main housing.

[0008] Another embodiment provides a power tool that may include a main housing. The motor may be located in the main housing. The power tool may further include a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool. The power tool may further include a sub-housing configured to accommodate the transmission mechanism. The power tool may further include a light source mounted to a front end of the sub-housing. The power tool may further include a passage through the sub-housing. The power tool may further include one or more wires electrically connected to the light source. One or more wires may extend through the passage.

[0009] Another embodiment provides a method of assembling a power tool. The method may include: providing a main housing; and placing a motor in the main housing. The method may further include: providing a sub-housing; and placing a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool in the sub-housing. The sub-housing may include a channel. The method may further include mounting a light source to a front end of the sub-housing. The method may further include: inserting one or more wires configured to be electrically connected to the light source through the channel so that at least a portion of the one or more wires is located in the channel.

[0010] Another embodiment provides a power tool that may include a main housing. The motor may be located within the main housing. The power tool may further include a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool. The power tool may further include a sub-housing configured to accommodate the transmission mechanism. The power tool may further include a lamp holding device mounted to a front end of the sub-housing. The power tool may further include a light source configured to be held by the lamp holding device. The power tool may further include a cover configured to cover at least a portion of a front surface of the lamp holding device. The sub-housing may include a first groove located on the front surface of the sub-housing. The first groove may be configured to receive a rearwardly protruding portion of the cover that protrudes further rearward than a main portion of the lamp holding device. The sub-housing may include a neck portion that includes a shoulder located on an outer peripheral surface of the neck portion. The shoulder may be configured to receive an overhanging portion of the cover that protrudes radially closer to an output axis of the output unit than the front surface of the lamp holding device.

[0011] Before any embodiment is explained in detail, it should be understood that the embodiment does not limit its application to the details of the configuration and arrangement of components set forth in the following description or shown in the accompanying drawings. The embodiments can be practiced or executed in various ways. In addition, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered restrictive. The use of "including", "comprising" or "having" and variations thereof is meant to cover the items listed thereafter and their equivalents, as well as additional items. Unless otherwise specified or limited, the terms "mount", "connect", "support" and "couple", and variations thereof are used broadly and cover both direct mounting, connection, support and coupling as well as indirect mounting, connection, support and coupling.

[0012] In addition, it should be understood that embodiments may include hardware, software, and electronic components or modules, which, for the purpose of discussion, may be shown and described as if most components are implemented only in hardware. However, those of ordinary skill in the art will recognize, based on a reading of this detailed description, that in at least one embodiment, electronic-based aspects may be implemented in software (e.g., stored on a non-transitory computer-readable medium) that may be executed by one or more processing units (such as a microprocessor and / or an application-specific integrated circuit ("ASIC")). Thus, it should be noted that embodiments may be implemented using a plurality of hardware- and software-based devices and a plurality of different structural components. For example, the "server" and "computing device" described in the specification may include one or more processing units, one or more computer-readable medium modules, one or more input / output interfaces, and various connectors (e.g., a system bus) connecting the various components.

[0013] Relative terms used in conjunction with quantities or conditions, such as "about", "approximately", "substantially", etc., will be understood by those of ordinary skill in the art to include the stated value and have the meaning dictated by the context (e.g., the term includes at least the degree of error associated with measurement accuracy, the tolerance associated with a particular value [e.g., manufacturing, assembly, use, etc.], etc.). Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. For example, the expression "from about 2 to about 4" also discloses a range "from 2 to 4". Relative terms can refer to positive and negative percentages (e.g., 1%, 5%, 10%, or more) of the indicated value.

[0014] It should be understood that although some drawings show hardware and software in a particular device, these depictions are for illustrative purposes only. The functions described herein as being performed by a component may be performed in a distributed manner by multiple components. Likewise, the functions performed by multiple components may be merged and performed by a single component. In some embodiments, the components shown may be combined or divided into separate software, firmware and / or hardware. For example, logic and processing may be distributed between multiple electronic processors, rather than being located in and performed by a single electronic processor. Similarly, components described as performing specific functions may also perform additional functions not described herein. For example, a device or structure that is "configured" in a certain manner may be configured at least in that manner, but may also be configured in a manner that is not explicitly listed.

[0015] Other aspects of the embodiments will become apparent by consideration of the detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A power tool including a shadowless illumination system according to some embodiments described herein is presented.

[0017] Figure 2 The present invention shows some embodiments according to the present invention. Figure 1 Cross-sectional view of a power tool.

[0018] Figure 3 The present invention shows some embodiments according to the present invention. Figure 1 Block diagram of a power tool.

[0019] Figure 4A The present invention shows some embodiments according to the present invention. Figure 1 A rear perspective view of a secondary housing of a power tool.

[0020] Figure 4B The present invention shows some embodiments according to the present invention. Figure 1 A front perspective view of a secondary housing of a power tool.

[0021] Figure 5A The present invention shows some embodiments according to the present invention. Figure 1 A rear stereoscopic view of the retaining part of the shadowless lighting system of the power tool.

[0022] Figure 5B The present invention shows some embodiments according to the present invention. Figure 1 A front stereoscopic view of the retaining part of the shadowless lighting system of the power tool.

[0023] Figure 5C The present invention shows some embodiments according to the present invention. Figure 5A and Figure 5B Rear perspective view of the cover of the retention portion.

[0024] Figure 5D The present invention shows some embodiments according to the present invention. Figure 5A and Figure 5B A rear perspective view of the lamp holding device showing the retaining portion thereof.

[0025] Figure 5E A method for converting a Figure 5A and Figure 5B The retaining part is fixed to Figure 4A and Figure 4B The retaining ring of the auxiliary housing.

[0026] Figure 6 The present invention shows some embodiments according to the present invention. Figure 1 Shadowless lighting system for power tools.

[0027] Figure 7 A method for manufacturing a power tool including a shadowless illumination system according to some embodiments described herein is presented.

[0028] Figure 8 Another power tool according to some embodiments described herein is shown, the other power tool comprising a plurality of Figures 1 to 6 Similar features of the power tool 100 and some Figures 1 to 6 Different characteristics of power tools.

[0029] Fig.9A The present invention shows some embodiments according to the present invention. Figure 8 A side view of a power tool with half of the clamshell housing removed, the packaging boat removed, and the retaining portion removed.

[0030] Fig. 9B The present invention shows some embodiments according to the present invention. Figure 8 Partially disassembled view of a power tool.

[0031] Fig. 9C The present invention shows some embodiments according to the present invention. Figure 8 A cross-sectional view of the front portion of the power tool.

[0032] Fig. 10A The present invention shows some embodiments according to the present invention. Figure 8 A rear perspective view of a secondary housing of a power tool.

[0033] Fig. 10B The present invention shows some embodiments according to the present invention. Figure 8 A front perspective view of a secondary housing of a power tool.

[0034] Fig.11A The present invention shows some embodiments according to the present invention. Figure 8 A stereoscopic view of a portion of a retaining portion of a power tool.

[0035] Fig. 11B The present invention shows some embodiments according to the present invention. Figure 8 A side view of a portion of a secondary housing of a power tool.

[0036] Fig. 12A The present invention shows some embodiments according to the present invention. Figure 8 A cross-sectional view of the retaining portion of a power tool.

[0037] Fig. 12B The present invention shows some embodiments according to the present invention. Figure 8 A cross-sectional view of a secondary housing of a power tool.

[0038] Fig.13A The present invention shows some embodiments according to the present invention. Figure 8 A rear stereoscopic view of the retaining part of the power tool.

[0039] Fig. 13B The present invention shows some embodiments according to the present invention. Figure 8 A front perspective view of a secondary housing of a power tool.

[0040] Fig.14A The present invention shows some embodiments according to the present invention. Figure 8 Another rear stereoscopic view of the retaining portion of the power tool.

[0041] Fig. 14B The present invention shows some embodiments according to the present invention. Figure 8 Another front perspective view of the secondary housing of the power tool.

[0042] Fig.15 An exemplary embodiment is shown Figure 8 The retaining ring of the power tool is used to Figure 8 The retaining part of the power tool is fixed to Figure 8 A secondary housing of a power tool.

[0043] Fig.16A and Fig. 16B According to some example embodiments, Figure 8 A cross-sectional view of a front portion of a power tool, wherein the second recess is configured to receive a Fig.15 Retaining ring. DETAILED DESCRIPTION

[0044] Figure 1 A power tool 100 including a shadowless lighting system according to an example embodiment is shown. The power tool 100 includes a main housing 105. The main housing 105 may be the main body of the power tool 100. The main housing 105 may be configured to house a brushless DC (BLDC) motor in an upper portion 107 of the main housing 105. Accordingly, the main housing 105 (particularly, the upper portion 107 of the main housing 105) may also be referred to as a motor housing. In some embodiments, the main housing 105 is formed by two pieces of plastic (e.g., a clamshell housing) configured to fit together so that an internal cavity is formed within the main housing 105. A portion of the main housing 105 may be formed as a handle 110 to allow a user to hold the power tool 100. A trigger 115 may be positioned on the handle 110 to allow a user to actuate the trigger 115 to variably control at least one parameter of the power tool 100. In some embodiments, the parameter may be the amount of power supplied to the motor of the power tool 100. The main housing 105 may further include a connection portion 120 (i.e., a foot portion of the power tool 100), which may include an interface 122 (i.e., a battery pack interface 122) configured to be removably connected to a battery pack (not shown). The interface 122 may include electrical contacts to allow power to be transmitted from the battery pack to the power tool 100 (e.g., to provide power to the motor and other components of the power tool 100). The power tool 100 further includes an output unit 125 located at one end of the upper portion 107 of the main housing 105 to provide an output of the power tool. For example, the output of the power tool may be a rotary output, an impact output, a reciprocating output, etc. In some embodiments, the output unit 125 may include accessories (e.g., a chuck, a collet, etc.) to removably connect an end tool (e.g., a tool bit) to the output unit 125. In other embodiments, the output unit 125 may be formed so that a fastener is directly removably connected to the output unit 125 to perform a loosening or tightening operation of the fastener. In some embodiments, the power tool 100 includes a forward / reverse switch 127 configured to allow a user to select a rotational direction of the output unit 125 .

[0045] The power tool 100 further includes a secondary housing 130 separated from the main housing 105. The secondary housing 130 can be configured to accommodate a transmission mechanism of the power tool 100, which is configured to transfer rotational energy from the motor of the power tool 100 to the output unit 125. In some embodiments, the secondary housing 130 is a gear box, a hammer box, etc. The secondary housing 130 can be made of metal. The secondary housing 130 can be positioned so that the end surface of the secondary housing 130 contacts at least a portion of the end surface of the main housing 105. For example, as Figure 1 As shown, the rear end of the secondary housing 130 can be fastened to the front end of the upper portion 107 of the main housing 105 using fasteners 132. Figure 4A and Figure 4B The sub-housing 130 is described in further detail.

[0046] The power tool 100 further includes a retaining portion 135, which is configured to retain one or more light sources of the power tool 100. In some embodiments, the retaining portion 135 is configured to surround the output unit 125. The retaining portion 135 may include one or more lenses 140 to allow the one or more light sources to emit light through the retaining portion 135. In some embodiments, the one or more light sources may be light emitting diodes (LEDs) arranged around a center point of the retaining portion 135 (i.e., arranged around an output axis of the output unit 125). FIG. 5A to FIG. 5E The retaining portion 135 is described in further detail. Although referred to as the retaining portion 135, the retaining portion 135 may also be referred to as the lighting assembly 135.

[0047] The specific power tool 100 (eg, an impact wrench) shown and described herein is merely an example. The lighting assembly 135 and associated wiring design disclosed herein may also be implemented on other types of power tools (eg, power drills, hammer drills, impact drivers, etc.).

[0048] Figure 2 A cross-sectional view of a power tool 100 according to an example embodiment is shown. The power tool 100 includes a motor 200 configured to provide a rotational output about an axis 202 (i.e., a motor axis or an output axis). The power tool 100 further includes a transmission mechanism 205 (i.e., a transmission device 205) configured to transmit the rotational output of the motor 200 to the output unit 125. The transmission mechanism 205 can be a gear transmission mechanism, an electronic transmission mechanism, an impact transmission mechanism, or a combination of multiple types of transmission mechanisms. At least a portion of the transmission mechanism 205 can be positioned in the secondary housing 130.

[0049] In some embodiments, the transmission mechanism of the power tool 100 includes an impact mechanism, which includes a hammer with an outwardly extending lug and an anvil with an outwardly extending lug. The anvil can be connected to the output unit 125. During operation, for example, when a fastener is driven into a workpiece, an impact occurs when the anvil encounters a certain amount of resistance. When this resistance is met, the hammer can continue to rotate. A spring connected to the back side of the hammer causes the hammer to disengage the anvil by axial retreat. Once disengaged, the hammer will advance both axially and rotationally to engage (i.e., impact) the anvil again. For example, when the impact mechanism is operated, the hammer lug impacts the anvil lug every 180 degrees. Accordingly, when the power tool 100 is impacting during operation, the hammer rotates 180 degrees without the anvil, impacts the anvil, and then rotates a certain amount with the anvil, and then repeats this process. For further reference to the functionality of the impact mechanism, see, for example, the impact mechanism discussed in US Application No. 14 / 210,812, filed on March 14, 2014, which is incorporated herein by reference.

[0050] The power tool 100 may further include a printed circuit board (PCB) 210 located in the handle 110 and a PCB 212 located in the connecting portion 120. One or both of the PCBs 210 and 212 include one or more electronic components that can implement a control system of the power tool 100. In some embodiments, the PCB 212 includes an electronic processor configured to receive power from a power source connected to the power tool 100 (e.g., a battery pack connected to the power tool 100 via the interface 122). The electronic processor may be configured to control whether to provide power to the light source and / or the motor 200. The PCB 210 may include switching elements (e.g., field effect transistors) that are controlled by the electronic processor to selectively provide power to the coil of the motor 200 to allow the operation of the motor. In other embodiments, the PCBs 210 and 212 may include additional or alternative components. For example, the components located on each PCB 210 and 212 as described above may be located on another PCB 210 and 212.

[0051] If through Figure 2 The cross-sectional view shows (and Figure 4A and Figure 4B), the sub-housing 130 includes a channel 215 (e.g., a through hole) configured to receive one or more wires 220, which are configured to be electrically connected to the LED to provide power to the LED. In some embodiments, an axis passing through the center of the channel 215 can be substantially parallel to the axis 202 of the motor 200. In some embodiments, the one or more wires 220 are connected to the PCB 210 to receive power from a power source of the power tool 100. In some embodiments, the power source that provides power to the LED via the one or more wires 220 is a battery pack configured to be connected to the interface 122 of the power tool 100. In some embodiments, the power source that provides power to the LED via the one or more wires 220 is a second power source separate from the battery pack. For example, the second power source is a button battery, etc. In some embodiments, the second power source is configured to provide power to the LED but not to the motor 200.

[0052] Figure 3 1 shows a block diagram 300 of a power tool 100 according to an example embodiment. The power tool 100 may include a controller 305. The controller 305 is electrically and / or communicatively connected to various modules or components of the power tool 100. For example, Figure 3 As shown, the controller 305 is electrically connected to the motor 200, the battery pack interface 122, the trigger switch 315 (connected to the trigger 115), one or more sensors or sensing circuits 320, one or more indicators 325, one or more light sources 330 (e.g., LEDs), a user input 335 (e.g., a switch, a button, a mode pad, etc.), a power input circuit system 340, and a switching element 345 (e.g., a FET switch 345). The controller 305 includes a combination of hardware and software that are operable to, among other things, control the operation of the power tool 100, monitor the operation of the power tool 100, enable one or more indicators 325 and / or light sources 330 (e.g., LEDs), etc.

[0053] The controller 305 includes a plurality of electrical and electronic components that provide power, operational control, and protection to the components and modules within the controller 305 and / or the power tool 100. For example, the controller 305 includes, among other things, an electronic processor 350 (e.g., a microprocessor, a microcontroller, or another suitable programmable device), a memory 355, an input unit 360, and an output unit 365. The electronic processor 350 includes, among other things, a control unit 370, an ALU 375, and a plurality of registers 380 (in Figure 3305) and is implemented using a computer architecture (e.g., a modified Harvard architecture, a von Neumann architecture, etc.). The electronic processor 350, the memory 355, the input unit 360 and the output unit 365, and the various modules or circuits connected to the controller 305 are connected via one or more control buses and / or data buses (e.g., a common bus 385). For purposes of illustration, the control bus and / or data bus are generally Figure 3 In view of the embodiments described herein, those skilled in the art will appreciate the use of one or more control buses and / or data buses for interconnection and communication between various modules, circuits and components.

[0054] The memory 355 is a non-transitory computer-readable medium and includes, for example, a program storage area 357 and a data storage area 358. The program storage area 357 and the data storage area 358 may include a combination of different types of memory, such as ROM, RAM (e.g., DRAM, SDRAM, etc.), EEPROM, flash memory, hard disk, SD card or other suitable magnetic storage device, optical storage device, physical storage device or electronic storage device. The electronic processor 350 is connected to the memory 355 and executes software instructions, which can be stored in the RAM of the memory 355 (e.g., during execution), the ROM of the memory 355 (e.g., on a generally permanent basis) or another non-transitory computer-readable medium such as another memory or disk. The software included in the embodiment of the power tool 100 can be stored in the memory 355 of the controller 305. The software includes, for example, firmware, one or more applications, program data, filters, rules, one or more program modules and other executable instructions. The controller 305 is configured to obtain from the memory 355 and execute instructions related to the control process and method described herein, in particular. In other configurations, the controller 305 includes additional components, fewer components, or different components.

[0055] The battery pack interface 122 includes a combination of mechanical components (e.g., tracks, grooves, latches, etc.) and electrical components (e.g., one or more terminals) that are configured and operable to interface (e.g., mechanically, electrically, and communicatively connect) the power tool 100 with the battery pack. For example, power provided by the battery pack to the power tool 100 is provided to the power input circuit system 340 through the battery pack interface 122. The power input circuit system 340 includes a combination of active components and passive components that are used to regulate or control the power received from the battery pack before providing it to the controller 305. The battery pack interface 122 can also power FET switches 345 that are configured to selectively provide power to the motor 200 based on instructions from the controller 305. The battery pack interface 122 also includes, for example, a communication line 390 that is configured to allow communication between the controller 305 and the battery pack.

[0056] The indicator 325 includes, for example, one or more light emitting diodes ("LEDs"). The indicator 325 can be configured to display the condition of the power tool 100 or information associated with the power tool. For example, the indicator 325 is configured to indicate a measured electrical characteristic of the power tool 100, the status of the device, etc. The user input 335 is operably connected to the controller 305 to, for example, select a forward operating mode or a reverse operating mode, a torque and / or speed setting of the power tool 100 (e.g., using a torque and / or speed switch or mode plate), etc. In some embodiments, the user input 335 includes a combination of digital and analog input or output devices required to achieve the desired operating level of the power tool 100, such as one or more knobs, one or more dials, one or more switches, one or more buttons, a mode plate, etc.

[0057] In some embodiments, the controller 305 (specifically, the electronic processor 350) is configured to control whether to provide power to the light source 330 (e.g., the light assembly 135) via the one or more wires 220. Figure 6610 shown). In some embodiments, the controller 305 can receive power from the power source of the power tool 100 and directly provide power to the light source 330. In such embodiments, the controller 305 can appropriately adjust the power before providing the received power to the light source 300. In other embodiments, the light source 330 can be electrically connected to the power source (e.g., connected to the battery pack via the battery pack interface 122 and one or more wires 220), and there is a switch between the light source 330 and the power source. In such embodiments, the controller 305 can control the switch to allow or not allow power to be provided to the light source 330. In such embodiments, the electrical path from the power source to the light source 330 may include a regulating circuit system similar to the power input circuit system 340 to regulate or control the power received by the light source 330 from the power source. In some embodiments, the controller 305 controls the light source 330 to be illuminated in response to determining that the trigger 115 has been actuated.

[0058] The controller 305 can be configured to use the sensor 320 to determine the monitoring tool condition. For example, the controller 305 can be configured to determine whether the power tool 100 has a fault condition and generate one or more control signals related to the fault condition. In some embodiments, the sensor 320 includes one or more current sensors, one or more speed sensors, one or more Hall effect sensors, one or more temperature sensors, etc. The controller 305 calculates or includes in the memory 355 predetermined operating thresholds and limits for the operation of the power tool 100. For example, when the controller 305 detects or predicts a potential thermal failure (e.g., thermal failure of a FET, motor 200, etc.), power to the motor 200 can be limited or interrupted until the possibility of thermal failure is reduced. If the controller 305 detects one or more such fault conditions of the power tool 100 or determines that the fault condition of the power tool 100 no longer exists, the controller 305 is configured to provide information and / or control signals to another component of the power tool 100 (e.g., battery pack interface 122, indicator 325, etc.). In some embodiments, the controller 305 is configured to control the output of the light source 330 to indicate information about a tool condition of the power tool 100 to a user (eg, by flashing the light source 330 a predetermined number of times to indicate different types of fault conditions).

[0059] Figure 4A A rear perspective view of the secondary housing 130 according to an example embodiment is shown. The secondary housing 130 includes a ridge portion 400 (also referred to as a protrusion 400) located on the outer peripheral surface of the secondary housing 130. In some embodiments, the ridge portion 400 protrudes outward from the outer peripheral surface of the secondary housing 130. Figure 4AIn the illustrated embodiment, the ridge portion 400 protrudes downward from the bottom of the outer peripheral surface of the secondary housing 130. At least a portion of the channel 215 is located in the ridge portion 400. Figure 4A As shown, one or more wires 220 are passed through the channel 215 such that at least a portion of the one or more wires 220 are located within the channel 215 .

[0060] In some embodiments, the secondary housing 130 is annular to accommodate the output unit 125. The cavity 405 may be formed on the rear surface 410 of the secondary housing 130. At least a portion of the transmission mechanism 205 may be positioned within the cavity 405. The rear surface 410 may include an opening to the cavity 405 so that the cavity 405 intersects with the internal opening of the main housing 105. In some embodiments, the channel 215 may include a first end 412 located at the front end of the secondary housing 130 and a second end 413 located at the rear end of the secondary housing 130. In these embodiments, the second end 413 may be open to the internal opening of the main housing 105 to allow one or more wires 220 to enter the main housing 105 to be electrically connected to a power source (e.g., a battery pack connected to the power tool 100). For example, the one or more wires 220 may extend downward through the trigger switch 315 to connect to the PCB 210 and / or PCB 212 when leaving the channel 215 and extending backward beyond the rear of the secondary housing 130.

[0061] Figure 4B A front perspective view of the secondary housing 130 is shown according to an example embodiment. As shown in the front perspective view, the channel 215 extends along the length of the spine portion 400 so that one or more wires 220 can be positioned along the length of the secondary housing 130. The secondary housing 130 further includes a front surface 415, which includes a positioning block 420 for positioning the retention portion 135. The secondary housing 130 further includes at least one mounting lug 425, which is configured to receive a fastener to at least partially secure the secondary housing 130 to the main housing 105. In some embodiments, the fastener is configured to be inserted through a first hole in a first clamshell housing portion of the main housing 105, then through a second hole in the mounting lug 425, and then through a third hole in a second clamshell housing portion of the main housing 105 to at least partially secure the two clamshell housing portions and the secondary housing 130 together. As shown in FIG. Figure 4B As shown, mounting lugs 425 may protrude (eg, downwardly) from spine portion / protrusion 400 .

[0062] The secondary housing 130 further includes a neck portion 430 that protrudes forward from the front surface 415. The neck portion 430 may include one or more grooves 435 configured to receive the retaining ring 518 (see Figure 5E ).exist Figure 4BIn the illustrated embodiment, only a single groove 435 is shown. The combination of the retaining ring 518 and the groove 435 can firmly hold the retaining portion 135 on the front surface 415 of the secondary housing 130, as described below with respect to Figure 5E Explained in more detail.

[0063] Figure 5A A rear perspective view of the retention portion / illumination assembly 135 is shown. Figure 5B A front perspective view of the retaining portion 135 / lighting assembly 135 is shown. The retaining portion 135 includes an extension portion 500 that protrudes from the outer peripheral surface of the retaining portion 135 (e.g., downward). The extension portion 500 can be generally aligned with the spine portion 400 of the secondary housing 130. In some embodiments, the channel 215 of the secondary housing 130 can be aligned with the external opening 502 in the extension portion 500. In addition, the retaining portion 135 can include an internal opening 503 located on the bottom of the inner surface of the cavity 504 of the retaining portion 135. In some embodiments, one or more wires 220 pass through the channel 215 of the secondary housing 130, through the external opening 502 of the extension portion 500 of the retaining portion 135, and then through the internal opening 503 of the retaining portion 135 to connect to the PCB 605 located in the cavity 504 of the retaining portion 135. In some embodiments, the LED 610 is located on the PCB 605 and receives power from the one or more wires 220 (see Figure 6 ).

[0064] In some embodiments, the retention portion 135 includes two main components: Figure 5D The inner portion 505 (i.e., the lamp holding device 505) shown in FIG. Figure 5C The outer portion 520 (i.e., cover 520) is shown. In some embodiments, the cover 520 is made of rubber or plastic and is overmolded onto the light holding device 505. The light holding device 505 can be made of a transparent material such as transparent plastic, resin, etc. In some embodiments, the lens 140 is integral with the light holding device 505. In other words, the light holding device 505 can be made of a single transparent mold including multiple lenses 140 to prevent the need to install individual lenses in openings in, for example, an opaque light holding device. The use of such a one-piece transparent mold for the light holding device 505 simplifies the manufacturing and assembly process of the lighting system of the power tool 100. In some embodiments, each of the lenses 140 protrudes axially from the front surface of the light holding device 505 through a corresponding opening in the cover 520 (see Figure 5B In some embodiments, lens 140 protrudes to be substantially flush with the front surface of cover 520 (see Figure 5B In other embodiments, the lens 140 protrudes forward beyond the front surface of the cover 520 .

[0065] like Figure 5B and Figure 5C As shown, the cover 520 of the retaining portion 135 includes three openings 525 to allow the first light source 610A behind the lens 140A, the second light source 610B behind the lens 140B, and the third light source 610C behind the lens 140C to emit light through the cover 520. In some embodiments, the cover 520 prevents light from being emitted through the lamp holding device 505 in all areas except through the lens 140. In other words, the cover 520 can be opaque to prevent light from being emitted through portions of the transparent lamp holding device 505 except through the lens 140.

[0066] Although the retention portion 135 is shown and described as having two main components (i.e., the light retaining device 505 and the cover 520), in other embodiments, these components are combined into a single component. In some of such embodiments, the single-piece retention portion 135 can be opaque and can include openings configured to receive separate lenses, which allow light to be emitted through the openings and the lenses.

[0067] like Figure 5D As shown, the lamp holder 505 may include three notches 530, each of which is configured to face a light source (e.g., Figure 6 The LED 610 shown) provides space to protrude into the recess 530. One recess 530 can be located behind each lens 140 and / or can form a part of each lens 140. The lamp holding device 505 can also include one or more radial protrusions 515 that radially protrude from the edge of the central opening 517 of the lamp holding device 505 toward the output unit 125 and the output axis 202. The one or more radial protrusions 515 can be configured to fix the retaining portion 135 to the secondary housing 130 (e.g., snap fit to the secondary housing 130) using the retaining ring 518 and the groove 435 of the neck portion 430 of the secondary housing 130. For example, the protrusions 519 of the retaining ring 518 can be configured to be received in the grooves between the radial protrusions 515 of the lamp holding device 505 and the rear surface of the edge of the central opening 517, respectively.

[0068] Figure 5E 5 shows a retaining ring 518 according to an example embodiment. In some embodiments, the retaining ring 518 is generally circular and can be a fully closed ring or a partially closed ring, such as Figure 5EAs shown. The retaining ring 518 may include a protrusion 519 that protrudes radially away from the output unit 125 and the output axis 202. In some embodiments, most of the retaining ring 518 is located in the groove 435 of the neck portion 430 of the secondary housing 130. However, the protrusion 519 may protrude outside the groove 435 to engage with the corresponding radial protrusion 515 of the lamp holding device 505 to hold / fix (e.g., snap fit) the lamp holding device 505 to the secondary housing 130.

[0069] Return to reference Figure 5A and Figure 5D In some embodiments, the light retaining device 505 includes a positioning gap 510, which is configured to cooperate with the positioning block 420 of the secondary housing 130 to properly align the secondary housing 130 and the retaining portion 135. The retaining portion 135 further includes a lighting system 600. The lighting system 600 can be positioned within the cavity 504 of the light retaining device 505 so that the lighting system 600 can be mounted to the front end of the power tool 100 and electrically connected to the power source of the power tool 100 via one or more wires 220. In some embodiments, the one or more wires 220 terminate in the retaining portion 135, specifically by connecting to the lighting system 600, as described below with respect to Figure 6 Explained.

[0070] Figure 6A front view of a lighting system 600 according to an example embodiment is shown. The lighting system 600 includes: a first PCB 605A including a first LED 610A; a second PCB 605B including a second LED 610B; and a third PCB 605C including a third LED 610C. In an alternative embodiment, the first PCB 605A, the second PCB 605B, and the third PCB 605C can be formed as a single annular ring-shaped or substantially annular PCB. The first LED 610A, the second LED 610B, and the third LED 610C can be positioned so that light emitted by the first LED 610A, the second LED 610B, and the third LED 610C is emitted through the corresponding lenses 140A, 140B, 140C of the transparent lamp holding device 505. In the illustrated embodiment, two wires 220 are respectively connected to each of the first electrical connection node 615 (e.g., a first welding point) and the second electrical connection node 620 (e.g., a second welding point). Additional wires 622 can electrically connect the second PCB 605B to the first PCB 605A, and additional wires 625 can electrically connect the first PCB 605A to the third PCB 605C. Through wires 220, 622, and 625, the first PCB 605A, the second PCB 605B, and the third PCB 605C can each receive power from a power source and / or a control signal from the controller 305. In some embodiments, the lighting system 600 includes additional or fewer PCBs 605 and / or LEDs 610. In some embodiments, the PCBs 605 and / or LEDs 610 can be arranged at different locations around the output axis 202. In some embodiments, the above description of the configuration of the output axis 202 is not limited to the configuration of the output axis 202. Figure 3 The depicted light source 330 includes an LED 610 .

[0071] Figure 7A method 700 for manufacturing a power tool (e.g., power tool 100) including an illumination system (e.g., shadowless illumination system 600) is shown. At frame 705, method 700 includes providing a main housing (e.g., main housing 105). Main housing 105 may include an internal portion configured to hold various components of the power tool. At frame 710, method 700 also includes placing a motor in main housing 105. In some embodiments, the motor is a BLDC motor 200 previously described herein. At frame 715, method 700 also includes providing a secondary housing (e.g., secondary housing 130). In some embodiments, secondary housing 130 is formed of metal, as previously described herein. In some embodiments, the secondary housing includes a protrusion 400 protruding downward from the bottom of the outer peripheral surface of secondary housing 130, as previously described herein. At frame 720, method 700 also includes placing a transmission (e.g., transmission 205) in secondary housing 130. The transmission 205 can be configured to transfer rotational energy between the motor 200 and the output unit 125 of the power tool 100, as previously described herein. In some embodiments, at least a portion of the transmission 205 is located within the secondary housing 130. The secondary housing 130 may include a channel 215, as previously described herein. At block 725, the method 700 also includes mounting a light source (e.g., one or more LEDs 610 that may be mounted in the retaining portion 135) to the front end of the secondary housing 130. The light source may be a shadowless lighting system 600, as previously described herein.

[0072] At block 730, the method 700 further includes inserting one or more wires (e.g., wires 220) configured to be electrically connected to the light source 610 through the passage 215 such that at least a portion of the one or more wires 220 is located in the passage 215. The passage 215 may begin at an interior portion of the main housing 105 and terminate at a front end of the secondary housing 130. In some embodiments, at least a portion of the passage 215 is located in the protrusion 400 of the secondary housing 130. The passage 215 may include a first end 412 located at the front end of the secondary housing 130 and a second end 413 located at the rear end of the secondary housing 130. In some embodiments, inserting the one or more wires 220 through the passage 215 includes leaving the second end 413 open to the interior of the main housing 105, routing the one or more wires 220 through the main housing 105, and electrically connecting the one or more wires 220 to a power source.

[0073] Figure 8 A power tool 800 is shown, which includes a plurality of Figures 1 to 6 Similar features of the power tool 100 and some Figures 1 to 6For the sake of brevity, many similar features will not be explained in detail. Instead, the main differences between power tool 100 and power tool 800 will be described in detail below. Figures 1 to 6 Features corresponding to features of power tool 100 are labeled with the same reference numerals (e.g., trigger switch 315) or with a reference numeral incremented by 700 (e.g., trigger 115 of power tool 100 can be similar to trigger 815 of power tool 800). In some embodiments, features described below with respect to power tool 800 can be implemented on corresponding portions of power tool 100 (e.g., light cover 520 can overlap with a groove / shoulder in sub-housing 130 to prevent light leakage, as described below with respect to power tool 800). Similarly, in some embodiments, features previously described herein with respect to power tool 100 can be implemented on corresponding portions of power tool 800. In some embodiments, Figure 3 The block diagram 300 may represent elements of the power tool 800 , and the functionality of the power tool 100 as previously explained herein may also be applicable to the power tool 800 .

[0074] In some embodiments, Figure 8 The power tool 800 includes a main housing 805 and a secondary housing 830 (eg, a hammer housing, a gear housing, etc.). The power tool 800 may further include a retaining portion 835 configured to retain one or more light sources 610 of the power tool 800 .

[0075] Fig.9A Shown Figure 8 A side view of the power tool 800 with half of the clamshell housing removed, the packaging boat of the PCB 910 removed, and the retaining portion 835 removed. 9A to 9C In the power tool 800 Figures 1 to 6 Features corresponding to features of power tool 100 are labeled with reference numerals increased by 700 (e.g., motor 200 of power tool 100 may be similar to motor 900 of power tool 800). In some embodiments, LED power cord 922 may be similar to LED power cord 220. Fig.9A As shown, in some embodiments, the secondary housing 830 may not have a channel 215 configured to accommodate one or more wires 922 that provide power to the light source 610. Similarly, the retaining portion 835 may not include openings 502, 503 configured to receive one or more LED power wires 922. Instead, as shown in FIG. Fig.9AAs shown, one or more wires 922 electrically connected to the light source 610 are routed along the outer peripheral side of the auxiliary shell 830 until one or more wires 922 pass the rear end of the auxiliary shell 830, at which time, one or more wires 922 are routed downward toward the handle 810 of the power tool 800.

[0076] When looking at the front of the power tool 800, Fig.9A The one or more wires 922 are shown extending along the right outer peripheral side of the secondary housing 830 at approximately the three o'clock position. In some embodiments, the one or more wires 922 may alternatively extend along the left outer peripheral side of the secondary housing 830 at approximately the nine o'clock position. In some embodiments, the one or more wires 922 may extend along the outer peripheral surface of the secondary housing 830 at any position above the three o'clock position and the nine o'clock position. In some embodiments of any of these embodiments, the one or more wires 922 may not be routed downward toward the handle 810 until the one or more wires pass the rear end of the secondary housing 830.

[0077] In some embodiments, the retention portion 835 includes wings 850 (see Figure 8 and Fig.13A ), these wings protrude axially rearwardly from the main portion 855 of the retaining portion 835 toward the rear of the secondary housing 830 along the outer peripheral side surface of the secondary housing 830. In some embodiments, the circular portion / partial cylindrical portion of the retaining portion 835 in which the light source 610 is mounted can be considered to be the main portion 855 of the retaining portion 835, and the wings 850 extend from the main portion. In some embodiments, when one or more wires 922 extend along the outer peripheral side of the secondary housing 830, one of the wings 850 extends on top of the one or more wires to protect the one or more wires 922 (for example, from debris, prying, etc.). In some embodiments, the wings 850 extending on top of the one or more wires 922 may not support the one or more wires 922. Instead, the outer peripheral side of the secondary housing 830 may include one or more first wire guides 950, and the one or more wires 922 are configured to friction fit in the one or more first wire guides (see Fig.9A Additionally or alternatively, an inner surface of the main housing 805 (e.g., an inner surface of a portion of a clamshell housing) may include a second wire guide 955 in which one or more wires 922 are configured to friction fit (see Fig. 9B In some embodiments, the second wire guide 955 is located behind the secondary housing 830 in the direction along the output axis 902 (see Fig. 9BIn some embodiments, the inner surface of the main housing 805 includes an additional or alternative second wire guide 955 adjacent to the outer peripheral side of the secondary housing 830. Fig. 9B As shown, second wire guide 955 can route one or more wires 922 rearwardly in a direction generally parallel to output axis 902 and / or downwardly toward handle 810 in a direction generally perpendicular to output axis 902 .

[0078] In some embodiments, the one or more wires 922 are connected to a power source as explained previously herein with respect to the one or more wires 220 .

[0079] Fig. 9C A cross-sectional view of the front portion of the power tool 800 is shown. Fig. 9C As shown, the retaining portion 835 may include an inner portion / light retaining device 905 and an outer portion / cover 920, which are similar to the inner portion / light retaining device 505 and the outer portion / cover 520 previously described herein, respectively, except for the differences explained below. In some embodiments, the secondary housing 830 and the cover 920 include overlapping areas 960, 965 to prevent / reduce light leakage that may occur when the flat rear end of the cover only abuts the flat front surface of the secondary housing. In other words, when the flat surfaces of the cover and the secondary housing only abut each other, light from the light source 610 may seep / leak out from the small opening between the cover and the secondary housing. This light seepage / leakage reduces the amount of light emitted forward toward the working area and may give the user a feeling that the power tool is poorly designed / assembled. Accordingly, there are problems with existing methods of mounting the light retaining portion on the secondary housing of the power tool.

[0080] The power tool 800 solves this problem by using a secondary housing 830 that includes a first groove 1055 located on the front surface 1015 of the secondary housing 830 (see Fig. 10B , Fig. 12B and Fig. 13B The first recess 1055 may be configured to receive a rearwardly protruding portion 1205 of the cover 920 that protrudes further rearward than the main portion 855 of the lamp holder 905 (see Fig. 12A and Fig.13A For example, rearward projection 1205 projects rearwardly in the same direction as wing 850, but may be included on a generally semicircular portion of main portion 855 of retention portion 835 (see Fig.13A In some embodiments, the protrusion 1205 continues along the wing 850 (see Fig. 12A and Fig.13A ), and is configured to fit in a continuation portion of the first groove 1055 that continues rearward on the outer peripheral side of the auxiliary housing 830 (see Fig. 10B ). In some embodiments, the combination of the first groove 1055 and the protrusion 1205 produces Fig. 9C The overlapping area 960 is shown to prevent / reduce light seepage / leakage between the cover 920 and the secondary housing 830 in a radial direction perpendicular to the output axis 902 .

[0081] The power tool 800 can further address the above-mentioned light seepage / leakage issues by using a secondary housing 830 including a neck portion 1030 including a shoulder 1050 located on the outer peripheral surface of the neck portion 1030 (see Fig. 10B and Fig. 11B The shoulder 1050 may be configured to receive an overhanging portion 1105 of the cover 920 that protrudes radially closer to the output axis 902 of the output unit 825 than the front surface of the lamp holder 905 (see Fig.11A ).like Fig. 11B As shown, in some embodiments, the shoulder 1050 includes a groove / indentation at the front end of the neck portion 1030 of the secondary housing 830 toward the output axis 902. Fig.11A and Fig. 11B Only a portion of the cover 920 and the secondary housing 830 are shown, but in some embodiments, the overhang 1105 of the cover 920 and the shoulder 1050 of the secondary housing 830 are fully rounded. In some embodiments, the combination of the overhang 1105 and the shoulder 1050 produces a Fig. 9C An overlapping area 965 is shown to prevent / reduce light seepage / leakage between the cover 920 and the secondary housing 830 in a forward direction parallel to the output axis 902 .

[0082] Fig.14A and Fig. 14B A perspective view of the retaining portion 835 and the secondary housing 830 is shown, highlighting the various parts involved in securing the retaining portion 835 to the secondary housing 830. In some embodiments, the power tool 800 includes a retaining ring 1518 positioned in a second groove 1035 in the secondary housing 830 (e.g., on the outer peripheral surface of the neck portion 1030 of the secondary housing 830) (see Fig.15 ). In some embodiments, the second groove 1035 is similar to the groove 435 previously explained herein with respect to the power tool 100, except that the second groove 1035 is discontinuous at approximately the twelve o'clock position, rather than being discontinuous at approximately the three o'clock position. In some embodiments, the lamp holding device 905 includes two first protrusions 1405 and 1410 that protrude radially toward the output axis 902. In some embodiments, the protrusion 1410 is similar to the protrusion 515 previously described herein with respect to the power tool 100. Although Fig.14AA single protrusion 1410 is shown, but another protrusion 1410 may be symmetrically located on the opposite side of the inner surface of the lamp holder 905 to receive a symmetrical protrusion 1519 of the retaining ring 1518 (see Fig.15 ). In some embodiments, the protrusion 1405 may be a fully circular protrusion.

[0083] In some embodiments, the retaining ring 1518 includes two second protrusions 1519, which protrude radially away from the output axis 902 (and leave the second groove 1035) and respectively engage with the two first protrusions 1405, 1410 of the lamp holding device 905 to fix the lamp holding device 905 to the auxiliary housing 830 (see Fig.15 ). In some embodiments, the second protrusions 1519 protrude in opposite directions from each other and are generally symmetrical to each other about a plane passing through the output axis 902. In some embodiments, the retaining ring 1518 is similar to the retaining ring 518 described previously herein with respect to the power tool 100, except that one of the second protrusions 1519 protrudes to the left and the other of the second protrusions 1519 protrudes to the right, rather than protruding upward and downward as in the power tool 100. In some embodiments, due to the shape of the retaining ring 518, 1518, the groove 435, 1035, and the protrusion 515, 1405, 1410, the retaining ring 518, 1518 is hidden from the user's view when the retaining portion 135, 835 is fixed to the secondary housing 830.

[0084] In some embodiments, the second groove 1035 surrounds the neck portion 1030 of the secondary housing 830 by less than 365 degrees. Fig. 14B As shown, the second groove 1035 is discontinuous at the twelve o'clock position, so that the second groove 435 does not form a complete circle around the neck portion 1030. In some embodiments, the retaining ring 1518 is a partially closed ring rather than a completely closed ring (see Fig.15 ). In some embodiments, the second groove 1035 forms a complete circle around the neck portion 1030. In some embodiments, the retaining ring 1518 is a completely closed ring.

[0085] In some embodiments, the second groove 1035 for retaining the retaining ring 1518 can be located at a different location on the secondary housing 830 than previously described herein. Fig.16A and Fig. 16B A cross-sectional view of the front portion of the power tool 800 is shown with the second groove 1035 located at a different position. Fig.16A , the second groove 1035 is located on the outer peripheral surface of the neck portion 1030 of the auxiliary housing 830, similar to Fig. 14B The second groove 1035 is shown. Fig. 16B In the embodiment shown in FIG. 8 , the second groove 1035 is located on the outer peripheral surface of the front face 1605 that protrudes axially forward of the secondary housing 830. These alternative positions are similarly applicable to the groove 435 of the power tool 100.

[0086] Thus, the embodiments described herein provide a power tool including an illumination system and more particularly a shadowless illumination system. Various features and advantages are set forth in the appended claims.

Claims

1. A power tool, characterized in that: The power tool includes: main housing; a motor, the motor being located in the main housing; a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool; a secondary housing in which at least a portion of the transmission mechanism is located, the secondary housing comprising an outer peripheral surface and a protrusion protruding outward from the outer peripheral surface; A light source is mounted on the front end of the secondary housing; a passage through the secondary housing, wherein at least a portion of the passage is located in the projection; and One or more wires electrically connected to the light source extend through the passage and into the interior of the main housing.

2. The power tool according to claim 1, wherein: The protrusion protrudes downward from the bottom of the outer peripheral surface of the auxiliary housing.

3. The power tool according to claim 2, wherein: The secondary housing includes a mounting lug configured to receive a fastener to at least partially secure the primary housing to the secondary housing; and Wherein, the mounting lug protrudes from the protrusion.

4. The power tool according to claim 1, wherein: An axis passing through the center of the passage is generally parallel to the axis of the motor.

5. The power tool according to claim 1, wherein: The light source includes a plurality of LEDs arranged around an output axis about which the output unit of the power tool rotates.

6. The power tool according to claim 1, wherein: The passage includes a first end located at the front end of the secondary housing and a second end located at the rear end of the secondary housing.

7. The power tool according to claim 1, wherein: At least a portion of the length of the passage is completely closed about an axis passing through the center of the passage.

8. The power tool according to claim 1, wherein: A first portion of the channel at the front end of the secondary housing is completely closed around an axis passing through the center of the channel, and a second portion of the channel behind the first portion is not completely closed around the axis passing through the center of the channel.

9. The power tool according to claim 1, wherein: The passage includes a through hole passing through the front surface of the secondary housing.

10. A power tool, characterized in that: The power tool includes: main housing; a motor, the motor being located in the main housing; a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool; a secondary housing configured to accommodate the transmission mechanism; A light source is mounted on the front end of the secondary housing; a through hole passing through the front surface of the secondary housing; and One or more wires are electrically connected to the light source, and the one or more wires extend through the through hole to the interior of the main housing to be electrically connected to a power source of the power tool.

11. The power tool according to claim 10, wherein: The auxiliary housing includes an outer peripheral surface and a protrusion protruding outward from the outer peripheral surface; and Wherein, at least a portion of the through hole is located in the protrusion.

12. The power tool according to claim 10, wherein: The through hole includes a first end located at the front end of the auxiliary housing and a second end located at the rear end of the auxiliary housing.

13. The power tool according to claim 10, wherein: At least a portion of the length of the through hole is completely closed about an axis passing through the center of the through hole.

14. The power tool according to claim 10, wherein: A first portion of the through hole at the front end of the secondary shell is completely closed around an axis passing through the center of the through hole, and a second portion of the through hole behind the first portion is not completely closed around an axis passing through the center of the through hole.

15. A power tool, characterized in that: The power tool includes: main housing; a motor, the motor being located in the main housing; a transmission mechanism configured to transfer rotational energy from the motor to an output unit of the power tool; a secondary housing configured to accommodate the transmission mechanism; a lamp holding device mounted to the front end of the secondary housing; a light source configured to be held by the lamp holding device; and a cover configured to cover at least a portion of a front surface of the lamp holding device; wherein the secondary housing includes a first groove on a front surface of the secondary housing, the first groove being configured to receive a rearwardly protruding portion of the cover, the rearwardly protruding portion protruding further rearwardly than a main portion of the lamp holding device; and Wherein, the auxiliary shell includes a neck portion, which includes a shoulder on the outer peripheral surface of the neck portion, and the shoulder is configured to receive the overhanging portion of the cover, which protrudes radially closer to the output axis of the output unit than the front surface of the lamp holding device.

16. The power tool according to claim 15, further comprising a retaining ring, the retaining ring being located in the second groove in the auxiliary housing; in, The lamp holding device includes two first protrusions that radially protrude toward the output axis; and The retaining ring includes two second protrusions, which protrude radially away from the output axis and are respectively engaged with the two first protrusions of the lamp holding device to fix the lamp holding device to the auxiliary housing.

17. The power tool according to claim 16, wherein: The second groove surrounds the neck portion of the secondary housing by less than 360 degrees; and The retaining ring is a partially closed ring rather than a completely closed ring.

18. The power tool according to claim 16, wherein: The second groove is located on one of the outer peripheral surface of the neck portion of the auxiliary housing and the outer peripheral surface of the front face of the auxiliary housing.

19. The power tool according to claim 16, wherein: The second protruding portions protrude in directions opposite to each other and are substantially symmetrical to each other about a plane passing through the output axis.

20. The power tool of claim 15, further comprising a through hole passing through the auxiliary housing, wherein: The one or more wires electrically connected to the light source pass through the through hole.

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