An electric power tool accessory

Abstract

The application discloses an electric tool accessory, which comprises a main body, a functional module and an accessory battery pack detachably mounted on the main body, wherein the accessory battery pack adopts the same type specification as a tool battery pack of the electric tool, and the two are interchangeably mounted. The accessory battery pack supplies power for the accessory functional module when being mounted on the main body; when the tool battery pack is out of power, the accessory battery pack can be detached from the main body and directly mounted on the electric tool to replace the tool battery pack and supply power for the tool. The application realizes one-pack multi-use of the accessory battery pack, meets the power supply demand of the accessory, provides emergency endurance when the tool is out of power, and effectively prolongs the endurance time of the electric tool, reduces the carrying burden and use cost.

Description

Technical Field

[0001] This invention belongs to the technical field of power tool accessories, and specifically relates to a power tool accessory. Background Technology

[0002] In fields such as garden maintenance, outdoor work, and construction, power tools (such as pruning machines, hair dryers, and lawn mowers) are gradually replacing traditional fuel-powered tools due to their advantages of being environmentally friendly, low-noise, and easy to operate. These power tools typically use removable battery packs, and the capacity of the battery pack directly determines the tool's battery life.

[0003] However, existing power tools have the following shortcomings in practical use:

[0004] In outdoor or remote work environments, users often cannot readily charge their battery packs. When the tool's only battery pack runs out of power, work is forced to stop, and users must wait for the battery pack to recharge or return to the work site to replace the spare battery, significantly impacting work efficiency.

[0005] Furthermore, existing power tool accessories (such as lights, fans, and rope reels) are typically designed to be used in conjunction with the main tool to extend its functionality. Some power-consuming accessories (such as lights and fans) require a power source. Existing power supply methods for these accessories mainly fall into two categories: one is sharing the same battery pack with the tool. In this method, using the accessory consumes additional power from the tool's battery pack, further shortening the tool's runtime. Users often have to choose between using the accessory and conserving the tool's battery. The other method is equipping the accessory with a dedicated battery (such as dry cell batteries or small-capacity lithium batteries). In this method, users need to carry a separate power supply for the accessory, and when the accessory's battery is depleted, it cannot be recharged using the tool's battery pack, resulting in complex power management.

[0006] Therefore, how to extend the battery life of power tools in a low-cost and convenient way when the battery pack is depleted is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0008] An accessory for use with a power tool equipped with a tool battery pack, the accessory comprising a body and a functional module mounted on the body, the body having a mounting base configured to detachably mount the accessory battery pack.

[0009] The accessory battery pack is of the same model and interchangeable with the tool battery pack. The accessory battery pack can be removed from the mounting base and installed on the power tool to replace the tool battery pack and power the power tool when the tool battery pack is depleted.

[0010] Furthermore, the functional module is powered by the accessory battery pack.

[0011] Furthermore, the power of the functional module does not exceed 15W.

[0012] Furthermore, the main body is detachably mounted on the power tool. Based on the orientation of the accessory during disassembly and placement, the functional module is mounted on the top of the main body, the accessory battery pack is mounted on the bottom of the main body via the mounting base, and the main body has an assembly groove in the middle for fixed mounting on the power tool.

[0013] Furthermore, the power tool has a lever body, and the mounting slot is a C-shaped structure that extends through the front-to-back direction and has an opening on the left or right side. The inner contour of the C-shaped structure is configured to accommodate the lever body of the power tool, such that the lever body can be inserted into the mounting slot through the opening.

[0014] Furthermore, the main body is provided with a latch on the open side of the assembly groove. One end of the latch is hinged to the main body, and the other end is provided with a screw. The top of the screw is provided with a knob, and the main body is provided with a locking hole that engages with the screw. When the screw is screwed into the locking hole by rotating the knob, the latch is in a locked position. In the locked position, the inner surface of the latch facing the assembly groove is positioned opposite to the groove wall of the assembly groove to jointly define a clamping area, and the rod is constrained within the clamping area.

[0015] Furthermore, the assembly groove is provided with an adapter pad that fits against the groove wall, and the thickness of the adapter pad is selected to match the rod diameter.

[0016] Furthermore, the side of the adapter pad facing the inside of the mounting groove has an anti-slip texture, which is configured to make frictional contact with the outer surface of the rod.

[0017] Furthermore, the main body includes a rotating seat and a base arranged vertically. The top of the base and the bottom of the rotating seat are both provided with semi-grooves, and the two semi-grooves cooperate to form the assembly groove. On the left or right side of the assembly groove, the base and the rotating seat are hinged together. On the other side of the assembly groove, a screw is mounted on the rotating seat. The base is provided with a locking hole corresponding to the position of the screw. In the locked state, there is an adjustment gap between the top surface of the base and the bottom surface of the rotating seat.

[0018] Furthermore, when the accessory battery pack is installed on the mounting base, the bottom of the accessory battery pack forms a support surface to support the power tool accessory in the detached state.

[0019] Compared with the prior art, this application has the following beneficial technical effects:

[0020] 1. Extend the battery life of power tools: By installing accessory battery packs that are interchangeable with the tool's battery pack, users no longer need to carry multiple chargers or spare batteries of different specifications at the work site; simply swapping them can extend the power tool's battery life.

[0021] 2. Achieving tiered utilization of electrical energy: When a power tool's battery pack is replaced due to insufficient power, its remaining energy is often wasted. This application, through an interchangeable design of low-power components and battery packs, enables the secondary utilization of this remaining energy, achieving tiered energy consumption from high-power tools to low-power components, and significantly improving the full life-cycle utilization rate of the battery pack.

[0022] 3. Achieve cross-model compatibility: By setting an adapter pad with selectable thickness, the assembly slot can adapt to the power tool body with different rod diameters, enabling a single part to be compatible with multiple power tools.

[0023] 4. Accessories can be used independently: This application achieves the independent standing function of accessories by setting the bottom of the battery pack as a flat support surface without adding any extra parts, which reflects the integration of structure and function. Attached Figure Description

[0024] Figure 1 This is an assembly diagram of the accessories and power tools in Example 1; Figure 2 This is a schematic diagram of the component in Example 1 in the locked state. Figure 3 This is a schematic diagram of the component of Example 1 in the unlocked state; Figure 4 This is an exploded view of the structure of the accessory in Example 1; Figure 5 This is a structural schematic diagram of the accessory in Example 2; Figure 6 This is a structural schematic diagram of the accessory in Example 3; Figure 7 This is a structural schematic diagram of the accessory in Example 4; Figure 8 This is a plan view of the accessory in Example 4.

[0025] 10. Main body; 11. Assembly slot; 12. Lock; 13. Screw; 14. Locking hole; 15. Adapter pad; 16. Mounting base; 17. Base; 18. Rotating seat; 19. Adjustment gap; 20. Functional modules; 20a. Lighting module; 20b. Fan module; 20c. Straw rope winding module; 30. Accessory battery pack; 31. Support surface; 40. Power tools; 41. Pole; 42. Tool battery pack. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] In the following embodiments, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of this invention, it should be understood that terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the description of this invention; therefore, they should not be construed as limiting this invention. Furthermore, terms such as first, second, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this invention, unless otherwise expressly specified and limited, terms such as installation, connection, linking, etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Example 1

[0030] like Figures 1 to 4 As shown, this embodiment provides a power tool accessory, which is a lighting accessory, used in conjunction with a power tool 40 powered by a battery pack. It is particularly suitable for installation with power tools 40 having a handle 41 (such as pruning machines, hair dryers, etc.) to provide auxiliary lighting for the work site.

[0031] The power tool accessory of this embodiment includes a main body 10, a functional module 20, and an accessory battery pack 30.

[0032] The main body 10 is the supporting frame of the entire accessory. It is injection molded from engineering plastics (such as ABS or PC / ABS alloy) with certain strength and toughness. Its structural layout is divided into three functional areas in the vertical direction: the top is used to install the functional module 20, the middle is provided with the assembly groove 11, and the bottom is used to install the accessory battery pack 30.

[0033] Functional module 20 is lighting module 20a, including a lamp barrel and a light source component housed within the lamp barrel, the power of which does not exceed 15W. Preferably, the lamp barrel houses components such as LED beads and a driver circuit board, and the LED beads are 10W high-brightness LED beads.

[0034] More preferably, the power range of the light source component is 5~10W. Adopting a low-power design below 10W ensures sufficient illumination brightness while further reducing power consumption, allowing tool battery packs with low remaining charge from power tools to provide longer effective lighting for accessories. For example, at 10W power, an 18V / 4.0Ah battery pack with 20% remaining charge can theoretically provide power for approximately 1.4 hours; while when the power is reduced to 8W, the battery life can be extended to nearly 1.8 hours, significantly improving the utilization value of the remaining energy in low-charge battery packs.

[0035] The accessory battery pack 30 is electrically connected to the drive circuit board of the lighting module 20a via wires. The accessory battery pack 30 provides DC power to the lighting module 20a, and the drive circuit board converts the voltage output by the accessory battery pack 30 into the rated voltage and current required by the LED beads. Since the power of the lighting module 20a in this embodiment does not exceed 15W (preferably 5W-12W), even if the battery pack replaced by the power tool 40 has only a small amount of power remaining (e.g., 20%-30% capacity), it is sufficient to support the continuous operation of the lighting module 20a for a relatively long time. Specifically, taking an 18V / 4.0Ah battery pack as an example, if its remaining power is 20%, the remaining energy is approximately 14.4Wh, which can power a 10W lighting module 20a continuously for about 1.4 hours, which is sufficient to meet the lighting needs of general work scenarios.

[0036] The main body 10 has a mounting base 16 at its bottom, and the accessory battery pack 30 is located at the bottom of the main body 10 by being mounted on the mounting base 16. When the accessory battery pack 30 is mounted on the mounting base 16, a flat support surface 31 is formed on the bottom of the housing of the accessory battery pack 30. When the accessory is removed from the power tool 40, the flat support surface 31 can stably support the accessory on the ground, workbench, or other horizontal surface, allowing the accessory to be placed upright independently.

[0037] The mounting base 16 is provided with electrical and mechanical interfaces, which are compatible with the electrical and mechanical interfaces of the tool battery pack 42 on the power tool 40. The electrical interface includes positive and negative contacts, and the mechanical interface includes structures such as engaging guide rails, snap-fit ​​clips, or locking slots, allowing the accessory battery pack 30 to be directly mounted onto the battery pack mounting base 16 of the power tool 40, and also allowing the tool battery pack 42 to be directly mounted onto the mounting base 16. This compatibility design enables interchangeable use between the accessory battery pack 30 and the tool battery pack 42. The mounting base 16 is electrically connected to the lighting module 20a via wires. When the accessory battery pack 30 is mounted on the mounting base 16, it supplies power to the lighting module 20a via the mounting base 16.

[0038] The main body 10 has an assembly groove 11 in the middle, which is used to fix accessories to the power tool 40. Specifically, the power tool 40 in this embodiment has a handle 41 (such as the handle or extension bar of a pruning machine), and the structure of the assembly groove 11 is adapted to the handle 41.

[0039] The mounting slot 11 is a C-shaped structure that runs through the front-to-back direction and has an opening on the left or right side. The inner contour of the C-shaped structure is configured to accommodate the rod 41 of the power tool 40, allowing the rod 41 to be inserted into the mounting slot 11 from the side through the opening. Specifically, the C-shaped structure includes an arc-shaped bottom wall and two side walls extending from both sides of the arc-shaped bottom wall, forming an opening between the two side walls. After the rod 41 enters the C-shaped slot through the opening, the arc-shaped bottom wall provides radial constraint. The opening size of the C-shaped structure is slightly smaller than the outer diameter of the rod 41, causing the rod 41 to elastically expand at the opening when inserted, using the elastic restoring force of the material to initially constrain the rod 41 within the C-shaped slot.

[0040] To further improve installation reliability, the main body 10 is provided with a latch 12 on the open side of the assembly groove 11. The latch 12 is generally arc-shaped, with one end hinged to the main body 10 via a hinge shaft, and the other end provided with a screw 13. A knob is fixed to the top of the screw 13. Correspondingly, the main body 10 is provided with a threaded locking hole 14 that mates with the screw 13. When the latch 12 rotates around the hinge shaft to the closed position, the user rotates the knob in the forward direction to screw the screw 13 into the locking hole 14, thus locking the latch 12. In the locked position, the inner surface of the latch 12 facing the assembly groove 11 is opposite to the groove wall of the assembly groove 11, and the two together define a closed clamping area, within which the rod 41 is constrained. When the user needs to unlock, simply rotate the knob in the reverse direction to disengage the screw 13 from the locking hole 14, and then rotate the latch 12 outward to open it.

[0041] Since the screw 13 and the locking hole 14 are threadedly fitted, the user can adjust the depth to which the screw 13 is screwed into the locking hole 14 by controlling the number of rotations of the knob, thereby changing the clamping force between the inner surface of the latch 12 and the rod 41. When it is necessary to more firmly fix the accessory to the power tool 40 (e.g., under vibration conditions), the user can tighten the knob to increase the clamping force; when it is necessary to adjust the installation position of the accessory on the rod 41, the user can loosen the knob appropriately to reduce the clamping force, and then tighten it again after adjustment. Thus, this knob structure not only realizes the locking function of the latch 12, but also provides stepless adjustment capability for the tightness between the accessory and the power tool 40, further improving the installation adaptability and operation convenience of the accessory.

[0042] To accommodate power tool 40 levers 41 with different diameters, an adapter pad 15 is provided within the mounting slot 11. The adapter pad 15 is a sheet-like structure made of a flexible material (such as rubber, silicone, or TPE), its shape conforming to the inner contour of the mounting slot 11 and fitting snugly against the slot wall. The adapter pad 15 can be fixed within the mounting slot 11 by adhesive bonding or interference fit. The adapter pad 15 is available in various thicknesses (e.g., 1mm, 2mm, 3mm, etc.). Users can select an appropriate thickness of adapter pad 15 based on the outer diameter of the power tool 40 lever 41, ensuring a tight fit between the inner contour of the adapter pad 15 and the outer surface of the lever 41, thereby eliminating gaps between the mounting slot 11 and the lever 41 and ensuring that levers 41 with different diameters can be reliably clamped.

[0043] Furthermore, the side of the adapter pad 15 facing the inside of the mounting groove 11 (i.e., the side in contact with the rod 41) is provided with an anti-slip texture. The anti-slip texture can be one or more combinations of wave patterns, grid patterns, diamond patterns, or dotted protrusions. When the rod 41 is clamped within the clamping area, the anti-slip texture forms frictional contact with the outer surface of the rod 41, increasing the axial friction force and effectively preventing the accessory from sliding or rotating along the length direction on the rod 41.

[0044] The installation and operation process of the accessories described in this embodiment is as follows:

[0045] Select an adapter pad 15 of appropriate thickness according to the outer diameter of the power tool 40 shaft 41, and attach the adapter pad 15 to the groove wall of the mounting groove 11. Open the latch 12 (i.e., the screw 13 disengages from the locking hole 14, and the latch 12 rotates outward), then align the opening of the mounting groove 11 with the shaft 41 of the power tool 40, and insert the shaft 41 into the mounting groove 11 from the side.

[0046] Rotate the latch 12 inward to close it, then turn the knob clockwise to screw the screw 13 into the locking hole 14 until the inner surface of the latch 12 is in close contact with the rod 41. At this point, the inner surface of the latch 12 and the groove wall of the mounting groove 11 together form a closed clamping area, reliably restraining the rod 41 within it. The user can further tighten or loosen the knob as needed to adjust the clamping tightness. Rotate the lamp tube as needed to adjust the lighting angle to a suitable position. Install the accessory battery pack 30 to the bottom of the main body 10 (if the accessory battery pack 30 is pre-installed), or install the battery pack of the power tool 40 onto the accessory, and turn on the switch of the lighting module 20a to start lighting.

[0047] To disassemble, turn the knob in the opposite direction to disengage the screw 13 from the locking hole 14, rotate it outward to open the latch 12, and then remove the rod 41 from the open side of the assembly slot 11. After disassembly, the accessory can be placed upright on a workbench or the ground via the flat support surface 31 at the bottom of the accessory battery pack 30 for easy storage and future use.

[0048] Example 2

[0049] This embodiment has the same basic structure as Embodiment 1, the difference being that the functional module 20 is different.

[0050] In this embodiment, reference Figure 5 Functional module 20 is fan module 20b. Fan module 20b includes fan blades, a motor, and a fan housing. The fan blades are mounted on the output shaft of the motor, and the fan housing covers the outside of the fan blades and has an air inlet and an air outlet. Fan module 20b is mounted on the top of the main body 10 and is powered by the accessory battery pack 30 at the bottom.

[0051] The overall power of the fan module 20b also does not exceed 15W, preferably 5W-8W, to ensure sufficient airflow while maintaining low noise and low power consumption. Similar to Embodiment 1, the electrical and mechanical interfaces of the accessory battery pack 30 are compatible with the battery pack of the power tool 40, allowing users to install the low-power battery pack removed from the power tool 40 onto the fan accessory for continued use.

[0052] In this embodiment, the connection between the fan module 20b and the main body 10 can be a fixed connection (fan orientation is fixed) or a rotatable connection (fan can rotate to adjust the air delivery direction), which can be selected according to actual needs.

[0053] The bottom of the accessory battery pack 30 also has a flat support surface 31, allowing the fan accessory to be placed independently and upright when detached, for example, on a workbench to provide cooling for the operator. Therefore, users do not need to keep the fan accessory permanently attached to the power tool 40; it can be detached and used independently during breaks or non-working periods, achieving multiple uses from a single item.

[0054] The other structures and installation methods in this embodiment are the same as in Embodiment 1, and will not be described again here.

[0055] Example 3

[0056] This embodiment has the same basic structure as Embodiment 1, the difference being that the functional module 20 is different.

[0057] In this embodiment, reference Figure 6 Functional module 20 is the grass-cutting rope winding module 20c. The grass-cutting rope winding module 20c is used to store and wind up the grass-cutting rope (also known as grass cutting line or mowing line) used by the grass cutter. It includes a winding reel and a housing that houses the winding reel. The housing has a wire outlet, from which one end of the grass-cutting rope extends, allowing the user to pull out an appropriate length of rope for replacement as needed.

[0058] A key difference between this embodiment and embodiments 1 and 2 is that the straw rope winding module 20c is a purely mechanical structure and requires no electrical drive. Therefore, the accessory battery pack 30 in this embodiment does not provide power to the functional module 20. However, the accessory battery pack 30 is still compatible with the battery pack of the power tool 40 through its electrical and mechanical interfaces, allowing it to serve as a backup replacement battery to provide alternative power when the power tool 40's battery pack is depleted.

[0059] Meanwhile, the flat support surface 31 at the bottom of the accessory battery pack 30 allows the mowing rope winding accessory to be placed independently and upright, making it convenient for users to access the mowing rope on the workbench. The mowing rope winding module 20c can also be installed on the handle 41 of the power tool 40 (such as a lawnmower) via the mounting slot 11 of the main body 10. When users are working in outdoor environments without a workbench, such as wide grasslands, if the mowing rope breaks or wears out and needs to be replaced, they do not need to carry spare mowing rope rolls or return to the workbench to retrieve the rope. Instead, they can directly pull out a new mowing rope from the winding module installed on the handle 41 of the lawnmower for replacement. The entire operation can be completed on-site, eliminating the need for users to run back and forth to retrieve rope, significantly improving replacement efficiency and work continuity.

[0060] The other structures and installation methods in this embodiment are the same as in Embodiment 1, and will not be described again here.

[0061] Example 4

[0062] This embodiment has the same basic structure as Embodiment 1, the main difference being the structure of the main body 10 and the locking method for clamping the accessories onto the rod 41 of the power tool 40. This embodiment eliminates the C-shaped open assembly slot, plate-type lock, and adapter pad of Embodiment 1, and instead adopts a split clamping structure that can adjust the clamping hole diameter and clamping force.

[0063] refer to Figure 7 and Figure 8 In this embodiment, the main body 10 includes a rotating seat 18 and a base 17 arranged vertically, with the rotating seat 18 located on top and the base 17 located on the bottom. The functional module 20 (such as the lighting module 20a) is hinged to the top of the rotating seat 18, allowing the functional module 20 to be tilted relative to the rotating seat 18. The bottom of the base 17 is provided with a mounting seat 16 for mounting the accessory battery pack 30.

[0064] The base 17 has a first semi-groove opening upwards at its top, and the rotating seat 18 has a second semi-groove opening downwards at its bottom. The first and second semi-grooves correspond in shape and position. When the rotating seat 18 is closed with the base 17, the first and second semi-grooves cooperate to form the mounting groove 11 for clamping the rod 41 of the power tool 40. At the left or right edge of the mounting groove 11, the base 17 and the rotating seat 18 are hinged together by a hinge shaft, allowing the rotating seat 18 to rotate and open relative to the base 17 around the hinge shaft. On the other side of the mounting groove 11 (i.e., the side opposite to the hinge side), a rotatable screw 13 is vertically inserted through the rotating seat 18, and a knob is fixed to the top of the screw 13; correspondingly, at the corresponding position on the base 17, a locking hole 14 is provided that is threadedly engaged with the screw 13.

[0065] When it is necessary to install the accessory onto the lever 41 of the power tool 40, first turn the knob in the reverse direction to completely disengage the screw 13 from the locking hole 14. Then, flip the rotating base 18 upwards to completely separate and open the first half-groove of the base 17 and the second half-groove of the rotating base 18. Insert the lever 41 laterally into the first half-groove, then flip the rotating base 18 downwards to reset it. At this point, the lever 41 is initially enclosed in the mounting groove 11 formed by the first and second half-grooves. Finally, turn the knob in the forward direction to screw the screw 13 into the locking hole 14 on the base 17 and continue tightening until the rotating base 18 firmly presses the lever 41 into place.

[0066] The key to this embodiment is that, in the fully locked state, the top surface of the base 17 and the bottom surface of the rotating seat 18 are not completely fitted together, but rather an adjustment gap 19 is reserved. This adjustment gap 19 makes the rotating seat 18 and the base 17 act like two clamping arms of a clamp, giving the entire clamping structure the ability to elastically deform. By controlling the depth to which the screw 13 is screwed into the locking hole 14, the size of this adjustment gap 19 can be changed, thereby precisely adjusting the clamping force applied to the rod 41. At the same time, the existence of this adjustment gap 19 also allows the diameter of the mounting groove 11 formed by the two semi-grooves to vary within a wide range, enabling it to natively adapt to rods 41 of various diameters without the need for an adapter pad 15 of additional thickness as in Embodiment 1.

[0067] The interchangeable use of other structural and functional modules 20 and accessory battery pack 30 in this embodiment is the same as in Embodiment 1. The clamping structure provided in this embodiment not only achieves stepless adjustment of clamping force and adaptability to multiple rod diameters without the need for adapter pads, but also simplifies the operation steps for accessory installation and disassembly, and avoids the risk of accessory failure due to aging or loss of adapter pad 15, thereby improving the durability and ease of use of the product.

[0068] In conventional designs in this field, accessories of power tools 40 (such as lights, fans, etc.) are typically powered by either sharing power with the tool or by using a separate low-capacity battery. The design philosophy emphasizes lightweight and low-cost accessories. Under this approach, the function of the accessory battery pack 30 is limited to powering the accessories.

[0069] This application breaks through the conventional thinking mentioned above. By designing the accessory battery pack 30 to be the same model and interchangeable with the tool battery pack 42, the accessory battery pack 30 achieves a dual function: on the one hand, when the accessory is installed on the tool, the accessory battery pack 30 powers the accessory; on the other hand, when the tool battery pack 42 is depleted, the accessory battery pack 30 can be removed and directly installed on the tool to replace the tool battery pack 42 in powering the tool, thus achieving multiple uses in one pack.

[0070] The unexpected technical effect of this design is that users do not need to carry a separate spare battery pack; the tool can gain additional power using the battery pack already on the accessory, significantly reducing carrying burden and overall cost. Simultaneously, the tool battery pack 42 can be detached and installed on the accessory to power the functional module 20 after its power is depleted. Tests show that, for example, with an 18V / 4.0Ah battery pack, even with only 20% remaining power, it can still support the 10W lighting module 20a to work continuously for approximately 1.4 hours. This effect is something that those skilled in the art could not anticipate or achieve using conventional lightweight design principles.

[0071] In this application, setting the power limit of the accessory functional module to 15W, preferably 5-10W, is a key support for achieving the unexpected technical effect of tiered utilization of the battery pack. The applicant discovered that when a power tool determines that its battery pack is depleted due to high power demand, the battery pack typically still retains 15%-30% residual energy. This energy, limited by voltage or current, cannot continue to drive the power tool's main unit, which typically has a power output of hundreds or even thousands of watts, but its total energy is still considerable. This application specifically "recovers" and utilizes this residual energy, which would otherwise be wasted, by combining low-power accessories (especially 5-10W lights, fans, etc.) with an interchangeable battery pack system. This design creates a complete closed loop of tiered utilization for the energy flow of a battery pack: the power tool is driven when the energy is sufficient, and the low-power accessories are driven when the energy is remaining, ultimately maximizing the utilization rate of the battery pack per charge—something that those skilled in the art could not anticipate using conventional design approaches.

[0072] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. An accessory for use with a power tool (40), said power tool (40) being equipped with a tool battery pack (42), characterized in that, The power tool accessory includes a body (10) and a functional module (20) mounted on the body (10). The body (10) is provided with a mounting base (16) configured to detachably mount an accessory battery pack (30). The accessory battery pack (30) is interchangeable with the tool battery pack (42) of the same model. The accessory battery pack (30) can be removed from the mounting base (16) and installed on the power tool (40) to replace the tool battery pack (42) to power the power tool (40) when the power of the tool battery pack (42) is exhausted.

2. The power tool accessory according to claim 1, characterized in that, The functional module (20) is powered by the accessory battery pack (30).

3. A power tool accessory according to claim 2, characterized in that, The power of the functional module (20) does not exceed 15W.

4. A power tool accessory according to claim 1, characterized in that, The main body (10) is detachably mounted on the power tool (40). Based on the posture when the accessory is disassembled and placed, the functional module (20) is mounted on the top of the main body (10), and the accessory battery pack (30) is mounted on the bottom of the main body (10) through the mounting base (16). The main body (10) is provided with an assembly groove (11) in the middle, and the assembly groove (11) is used to fix it to the power tool (40).

5. A power tool accessory according to claim 4, characterized in that, The power tool (40) has a rod (41), and the mounting slot (11) is a C-shaped structure that runs through the front and back direction and has an opening on the left or right side. The inner contour of the C-shaped structure is configured to accommodate the rod (41) of the power tool (40) so that the rod (41) can be inserted into the mounting slot (11) through the opening.

6. A power tool accessory according to claim 5, characterized in that, The main body (10) is provided with a latch (12) on the open side of the assembly groove (11). One end of the latch (12) is hinged to the main body (10), and the other end is provided with a screw (13). The top of the screw (13) is provided with a knob. The main body (10) is provided with a locking hole (14) that matches the screw (13). When the screw (13) is screwed into the locking hole (14) by rotating the knob, the latch (12) is in the locked position. In the locked position, the inner surface of the latch (12) facing the assembly groove (11) is set opposite to the groove wall of the assembly groove (11) to jointly define the clamping range. The rod (41) is constrained within the clamping range.

7. A power tool accessory according to claim 5, characterized in that, The assembly groove (11) is provided with an adapter pad (15) that fits against the groove wall of the assembly groove (11), and the thickness of the adapter pad (15) is selected to match the rod diameter of the rod body (41).

8. A power tool accessory according to claim 7, characterized in that, The side of the adapter pad (15) facing the inside of the mounting groove (11) has an anti-slip texture, which is configured to make frictional contact with the outer surface of the rod (41).

9. A power tool accessory according to claim 4, characterized in that, The main body (10) includes a rotating seat (18) and a base (17) arranged vertically. The top of the base (17) and the bottom of the rotating seat (18) are provided with a half groove, and the two half grooves cooperate to form the assembly groove (11). On the left or right side of the assembly groove (11), the base (17) and the rotating seat (18) are hinged together. On the other side of the assembly groove (11), a screw (13) is mounted on the rotating seat (18). The base (17) is provided with a locking hole (14) corresponding to the position of the screw (13). In the locked state, there is an adjustment gap (19) between the top surface of the base (17) and the bottom surface of the rotating seat (18).

10. A power tool accessory according to claim 1, characterized in that, When the accessory battery pack (30) is installed on the mounting base (16), the bottom of the accessory battery pack (30) forms a support surface (31) to support the power tool accessory in the disassembled state.

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