Fastener driving tool

Abstract

A fastener drive tool includes a housing, a drive mechanism, a battery pack, and a fastener cartridge. The housing has a handle portion between the power source portion and the drive portion. The drive mechanism comprises: (i) a motor; (ii) a gearbox operably connected to the motor; and (iii) an impact mechanism operably connected to the gearbox. A battery pack is received by the power supply portion and configured to supply electrical energy to the motor. The fastener cartridge is configured to hold a plurality of fasteners. A fastener cartridge is mounted on the housing and operably connected to the impact mechanism. The motor and the gearbox are located in the handle portion of the housing. The impact mechanism is located in the drive portion of the housing. The center of gravity of the fastener driving tool is located within the handle portion.

Description

[0001] This application claims priority to U.S. Provisional Application No. 63 / 649,780, filed May 20, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] This disclosure relates to the field of power tools, and more particularly to means and tools for driving fasteners into a workpiece. Background Technology

[0003] Fasteners such as nails and staples are commonly used in projects ranging from handicrafts to building construction. While manually driving such fasteners into workpieces is efficient, users can quickly become fatigued when projects involve driving a large number of fasteners and / or physically large fasteners into workpieces. Furthermore, properly driving larger fasteners into workpieces often requires more than a single impact from hand tools.

[0004] In response to the drawbacks of manual drive tools, power-assisted devices have been developed for driving fasteners into workpieces. Contractors and homeowners commonly use such devices to drive fasteners, ranging from headless nails used in small projects to common nails used in framing and other construction projects, and U-shaped nails used in both large and small projects. Traditionally, compressed air has been used to power power-assisted (pneumatic) devices. Specifically, a compressed air source is used to actuate a cylinder that strikes the nail into the workpiece. However, such systems require an air compressor, increasing the cost of the system and limiting its portability. In response, fuel cells have been developed as a power source for power-assisted devices. These fuel cells are typically provided in cylindrical form and are removably attached to the device. Systems with fuel cells rely on the rapid expansion of gas into the cylinder, thus striking the fastener into the workpiece. These systems are relatively complex because both electrical and fuel systems are required to generate the gas expansion.

[0005] Another power source used in power-assisted devices is electrical power. Traditionally, electrical devices have been primarily limited to use when impacting small fasteners, such as U-bolts, flathead screws, and headless screws. In these devices, a solenoid driven by electrical power from an external source is used to impact the fastener. However, the force achievable using a solenoid is limited by the physical structure of the solenoid. Various methods have been used to overcome the limitations of electrical devices. In some systems, multiple impacts are used. This method requires holding the tool in place for a relatively long time to drive the fastener. Another method is to use a spring to store energy. In this method, the spring is tilted (or activated) by an electric motor. Once enough energy is stored in the spring, it is released into the anvil, which then impacts the fastener into the substrate.

[0006] Other fastener actuators use a flywheel to store energy for use in impacting fasteners. The flywheel is used to actuate the hammer anvil of an impact nail or other fastener. A DC motor rotates the flywheel, and once a predetermined flywheel speed is reached, the flywheel moves to engage with a drive mechanism that impacts the fastener at the end of the fastener cartridge. Details of fastener actuators using flywheel mechanisms are disclosed in U.S. Patent Nos. 7,934,565 and 8,746,526, the disclosures of which are incorporated herein by reference.

[0007] Fasteners such as nails or U-bolts are held in a cartridge or box mounted to the body of the fastener driver. This cartridge provides uniform guides that allow the fasteners to enter the drive mechanism with proper and consistent alignment. One consideration for fastener drivers is the weight of the assembly. The housing and drive mechanism of a fastener driver can weigh 7-10 pounds. A cartridge holding a sufficient number of fasteners to prevent excessive refilling of the driver or fastener assembly can result in a considerable weight for the fasteners, approximately 1-2 pounds when the fasteners are relatively large and heavy. This overall weight can be cumbersome for a handheld tool, especially when the tool is used to drive fasteners horizontally into a workpiece, such as when mounting trim to a vertical wall. Furthermore, and equally importantly, the weight orientation of conventional fastener drivers makes proper alignment of the tool relative to the workpiece inconvenient.

[0008] exist Figure 1A In the exemplary tool T shown, the center of gravity CG of tool T is significantly offset from the fastener housing M and the point of impact I of the tool. Furthermore, the handle G is significantly offset from the point of impact I. When the user attempts to manipulate the tool for proper alignment to drive the fastener into the workpiece, the positions of the handle G and the center of gravity CG relative to the point of impact I generate a counterclockwise torque. Figure 1B As described, when a user operates the tool at arm's length, the cantilevered load exacerbates the torque due to the weight of the tool T. This torque then exerts a load on the user's wrist as the user struggles to resist it while manipulating the tool T. Summary of the Invention

[0009] According to an exemplary embodiment of this disclosure, a fastener driving tool includes a housing, a drive mechanism, a battery pack, and a fastener cartridge. The housing has a handle portion located between a power supply portion and a drive portion. The drive mechanism includes: (i) a motor; (ii) a gearbox operatively connected to the motor; and (iii) an impact mechanism operatively connected to the gearbox. The battery pack is received by the power supply portion and operatively connected to the motor. The fastener cartridge is configured to hold a plurality of fasteners. The fastener cartridge is mounted on the housing and operatively connected to the impact mechanism. The motor and gearbox are located in the handle portion of the housing. The impact mechanism is located in the drive portion of the housing. The impact mechanism is configured to impact a corresponding fastener among the plurality of fasteners using rotation caused by the gearbox, which is rotated by the motor powered by the battery pack. The center of gravity of the fastener driving tool is located within the handle portion.

[0010] According to another exemplary embodiment of this disclosure, a fastener driving tool includes a housing, a drive mechanism, a power source, and a fastener cartridge. The housing has a handle portion located between a power source portion and a drive portion. The drive mechanism includes: (i) a motor; (ii) a gearbox operatively connected to the motor; and (iii) an impact mechanism operatively connected to the gearbox. The power source is received by the power source portion and configured to supply electrical energy to the motor. The fastener cartridge is configured to hold a plurality of fasteners. The fastener cartridge is mounted on the housing and operatively connected to the impact mechanism. The motor and gearbox are located in the handle portion of the housing. The impact mechanism is located in the drive portion of the housing. The impact mechanism is configured to impact a corresponding fastener among the plurality of fasteners using rotation caused by the gearbox, which is rotated by the motor. The center of gravity of the fastener driving tool is located within the gearbox. Attached Figure Description

[0011] The above features and advantages, as well as other features and advantages, will become more apparent to those skilled in the art from the following detailed description and accompanying drawings, in which:

[0012] Figure 1A This illustrates a prior art fastener driving tool;

[0013] Figure 1B Showing the product in use Figure 1A Existing technological tools;

[0014] Figure 2 A side view of a fastener driving tool according to this disclosure is shown;

[0015] Figure 3 yes Figure 2 The cross-sectional view of the tool shown illustrates the drive mechanism within the tool's housing;

[0016] Figure 4Showing the shoulder strap Figure 2 Tools;

[0017] Figure 5 This is an example size of the tool. Figure 2 A diagrammatic representation of the tools shown; and

[0018] Figure 6 A side view of another embodiment of the fastener driving tool is shown. Detailed Implementation

[0019] For the purpose of promoting an understanding of the principles of this disclosure, reference will now be made to embodiments illustrated in the accompanying drawings and described in the following written description. It should be understood that this is not intended to limit the scope of the disclosure. It should also be understood that this disclosure includes any changes and modifications to the illustrated embodiments, and includes further applications of the principles of this disclosure that would normally occur to those skilled in the art to which this disclosure pertains.

[0020] Various aspects of this disclosure are disclosed in the accompanying description. Alternative embodiments and equivalents of this disclosure may be designed without departing from the spirit or scope thereof. It should be noted that any discussion herein of “an embodiment,” “an embodiment,” “an exemplary embodiment,” etc., indicates that the described embodiment may include specific features, structures, or characteristics, and that such specific features, structures, or characteristics may not necessarily be included in every embodiment. Furthermore, references to the foregoing do not necessarily include references to the same embodiments. Finally, whether explicitly described or not, those skilled in the art will readily appreciate that each specific feature, structure, or characteristic of a given embodiment may be used in relation to or in combination with specific features, structures, or characteristics of any other embodiment discussed herein.

[0021] For the purposes of this disclosure, the term "A and / or B" means (A), (B), or (A and B). For the purposes of this disclosure, the term "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C).

[0022] As used in embodiments of this disclosure, the terms “comprising,” “including,” “having,” etc., are synonymous.

[0023] According to this disclosure, a fastener driver tool 100 is provided, which solves the problems of prior art driver tools (e.g., Figure 1A , 1B The weight and balance of the tool T shown. Figure 2 As shown, tool 100 includes a housing 104, a battery pack 108, and a fastener box 112. The drive mechanism 116 of tool 100 (… Figure 3The tool 100 is located within housing 104. As described herein, the center of gravity 118 of the tool 100 is optimally positioned to balance the tool 100 and reduce undesirable torque and cantilever loads of prior art tools T, thereby making the tool 100 of this disclosure more comfortable to operate. Each element of the tool 100 is described below.

[0024] In one embodiment, the housing 104 is formed of a lightweight and durable material (e.g., plastic or resin). For example, the housing 104 is formed of two mating halves and includes internal features (see...). Figure 3 The housing 104 defines a handle portion 120, a power supply portion 124, a drive portion 128, and a housing support portion 132 to support and orient the working parts of the tool 100. Figure 2 It can be understood that the drive section 128 and the power supply section 124 are arranged on both sides of the handle section 120, thereby substantially forming an ergonomic saddle between the two sections 124, 128 for the user to hold comfortably and stably.

[0025] In one embodiment, the handle portion 120 is barrel-shaped and ergonomically constructed for comfortable grip by a user. The handle portion 120 is offset from the housing support portion 132 such that the housing 104 defines a finger opening 136 sized to receive the user's fingers when gripping the handle portion 120. The handle portion 120 is located between the power supply portion 124 and the drive portion 128. The finger opening 136 is located between the handle portion 120 and the fastener housing 112. The handle portion 120 defines a longitudinal handle axis 138, and the finger opening 136 defines a longitudinal finger axis 142 parallel to the longitudinal handle axis 138.

[0026] Fastener holder 112 is mounted on the housing support portion 132 of housing 104. Fastener holder 112 is configured to hold a plurality of fasteners 140, one of which is in Figure 2 As shown in the diagram. Fastener cartridge 112 contains any type of fastener, such as nails and U-bolts, and is configured to be reloaded as needed. Fastener cartridge 112 supplies fastener 140 to impact point 144 of tool 100, where drive mechanism 116 strikes fastener 140 to drive fastener 140 into workpiece.

[0027] The power supply section 124 includes and / or provides power to the support tool 100. For example... Figure 2 As shown, an exemplary power source is a removable and rechargeable battery pack 108. The battery pack 108 is received by a power supply section 124 of the housing 104. The battery pack 108 provides electrical energy. In another embodiment, the power source is an AC power source (not shown), configured for connection to a mains power source using a corresponding cable or wire (not shown).

[0028] The drive portion 128 of the housing 104 includes a drive mechanism 116. For example... Figure 2 As shown, the drive portion 128 defines a drive longitudinal axis 146. The longitudinal handle axis 138 is perpendicular to the drive longitudinal axis 146.

[0029] refer to Figure 4 The drive mechanism 116 of tool 100 includes a motor 160, a gearbox 164, a crank mechanism 168, and an impact mechanism 172. Motor 160 is an electric motor that receives electrical energy from a power source (e.g., battery pack 108), such that battery pack 108 is operatively connected to motor 160. In embodiments of tool 100 without battery pack 108, motor 160 receives power from AC power. Motor 160 is provided as either a brushless motor or a brushed motor.

[0030] In one embodiment, gearbox 164 includes a reduction gear such that the output of gearbox 164 rotates more slowly and has greater torque than the output of motor 160. Gearbox 164 is operatively connected to motor 160. In one embodiment, gearbox 164 is a relatively heavy component of drive mechanism 116 and includes a metal housing and metal gears. Longitudinal handle axis 138 extends through gearbox 164.

[0031] A crank mechanism 168 is operatively connected to the output of a gearbox 164 and the input of an impact mechanism 172. The crank mechanism 168 is operable to compress the spring 176 of the impact mechanism 172 using the rotation of a power-powered motor 160 and the gearbox 164. Furthermore, the crank mechanism 168 is configured to release the compressed spring 176, causing the spring 176 to generate an impact force. In one embodiment, the crank mechanism 168 is located at the interface between the handle portion 120 and the drive portion 128 within the housing 104.

[0032] Impact mechanism 172 includes at least a spring 176 and an anvil 180. Impact mechanism 172 is located in the drive portion 128 of housing 104. Impact mechanism 172 is operatively connected to gearbox 164 via crank mechanism 168. In one embodiment, spring 176 is a compression spring. In response to crank mechanism 168 releasing the compressed spring 176, spring 176 applies an impact force to anvil 180. Anvil 180 then impacts a corresponding fastener 140 and drives fastener 140 into the workpiece. Fastener cartridge 112 is operatively connected to impact mechanism 172 to provide fastener 140 to anvil 180. Anvil 180 forcibly ejects fastener 140 from fastener cartridge 112 at impact point 144. Therefore, the impact mechanism 172 is configured to impact the corresponding fastener 140 using rotation caused by a gearbox 164, which is rotated by a motor 160 powered by a battery pack 108 or other power source.

[0033] like Figure 2 As shown, tool 100 also includes an activation button 184 and a safety switch 188. The activation button 184 is mounted on the housing 104. When the user presses the activation button 184, assuming the safety switch 188 and all other safety interlocking devices are active, the drive mechanism 116 is activated to impact the corresponding fastener 140. Figure 2 As shown, the longitudinal axis 142 of the finger passes through the activation button 184. The exemplary activation button 184 is mirrored on opposite sides of the housing 104 to allow for left- and right-hand grip and activation. In one embodiment, pressing one of the mirrored activation buttons 184 activates the drive mechanism 116 of the tool 100. In another embodiment, pressing both mirrored activation buttons 184 simultaneously activates the drive mechanism 116, for example, by pinching between the user's thumb and forefinger. Thus, the tool 100 uses two activation points to activate the drive mechanism 116. Note that in this embodiment, the safety switch 188 is not included because the pinching action provides two actuation points.

[0034] like Figure 2 As shown, a safety switch 188 is mounted on the handle portion 120. The safety switch 188 is activated to allow operation of the activation button 184. Therefore, in one embodiment, the tool 100 provides two activation points (i.e., an activation button 184 and a safety switch 188) to activate the drive mechanism 116. In the illustrated embodiment, the safety switch 188 is a lever that is pressed down when the user grips the tool 100. In another embodiment, the safety switch 188 is a passive hand sensor, such as a capacitive area, an inductive area, or an electronic pressure pad, that detects when the handle portion 120 is gripped by the user.

[0035] like Figure 4 As shown, the fastener driving tool 100 includes a shoulder strap 192, which can utilize a conventional clip 194 ( Figure 4 Only one of them is visible in the image) to be removably fastened to the housing 104 of the tool 100. More specifically, the clip 194 at the end of the strap 192 engages with a corresponding accessory 196 at the end of the drive portion 128 of the housing 104 and another accessory 196 near the end of the power supply portion 124. Figure 4 (Not visible in the image). Therefore, the belt 192 has a first end removably connected to the drive portion 128 of the housing 104 and a second end removably connected to the power supply portion 124 of the housing 104.

[0036] The pad 198 is slidably mounted on the belt 192. The belt 192 may also be provided with a storage container (not shown) for storing various accessories or parts used with the tool 100.

[0037] Shoulder strap 192 allows the user to keep tool 100 close at hand during the nailing / binding process. In many cases, the workpiece must be continuously supported by the user during processing, such as when molding strips are fastened to a vertical wall. In such cases, keeping tool 100 close at hand essentially eliminates the need for the user to release the workpiece just to retrieve tool 100. Strap 192 allows the user to carry tool 100, making it readily available for use. In another feature, strap 192 is arranged and sized to help the user hold tool 100 while aligning and activating it. First, strap 192 is arranged to engage the opposite ends of the fastener-driven tool 100, rather than being concentrated at a single location on tool 100. Thus, strap 192 and tool 100 essentially form a continuous loop from which the user applies an outward force when manipulating tool 100. Second, strap 192 is sized so that it can wrap around the user's upper body. The combination of these two features allows the user to maintain tension on the belt 192 while manipulating the tool 100 to properly align with the workpiece. As the tool 100 moves up and down or left and right to proper alignment, the tension on the belt 192 acts as a lever to support the tool 100. This feature not only aids in aligning the tool 100 but also reduces muscle fatigue for the user. First, the belt 192 bears a portion of the weight of the tool 100. Furthermore, maintaining tension on the belt 192 during use allows the user to activate muscles other than those in the arms to manipulate the tool 100, thus distributing the workload for supporting and operating the tool 100 among the larger muscles of the upper body.

[0038] To optimally position the center of gravity 118 of tool 100, tool 100 integrates most of the drive mechanism 116 into the barrel-shaped handle portion 120 of housing 104, such as Figure 4As shown, the center of gravity 118 is located within the handle portion 120 of the housing 104. More specifically, in one embodiment, the center of gravity 118 is located in the area of ​​the handle portion 120 that is engaged by the user's thumb and forefinger. In one embodiment, the center of gravity 118 is located within the gearbox 164. The center of gravity 118 is a point where the entire weight of the tool 100, including the battery pack 108 (when equipped), can be considered to be concentrated at that point. The center of gravity 118 is a point where the tool 100, including the battery pack 108 (when equipped), is in equilibrium relative to gravity.

[0039] In one embodiment, the optimal center of gravity 118 is achieved by fully positioning the motor 160 and gearbox 164 within the handle portion 120 of the housing 104. This arrangement places the majority of the weight of the drive mechanism 116 within the handle portion 120 and positions the center of gravity 118 as close as possible to the user's hand within the handle portion 120. Furthermore, since most components of the drive mechanism 116 are housed within the handle portion 120, their weight is directly supported by the user's grip. Additionally, due to the construction of the housing 104, the handle portion 120 itself is positioned as close as possible to the fastener cartridge 112 and the impact point 144, significantly reducing or eliminating the counterclockwise torque generated during the positioning and operation of the fastener drive tool 100 compared to the prior art fastener actuators T discussed above. Specifically, the center of gravity 118 is oriented at the lower third of the drive portion 128 and is positioned closer to the fastener cartridge 112 and the impact point 144 compared to the prior art tool T. From another perspective, the handle portion 120 of tool 100 allows the user's grip to move forward toward the drive portion 128 and downward toward the impact point 144. Therefore, the housing 104 is configured such that the center of gravity 118 is preferably within, or at least closely adjacent to, the user's grip on the handle portion 120. For the tool 100 of this disclosure, the prior art tool T (see...) Figure 1B The counterclockwise torque generated is negligible. Users can use the forearm to handle vertical and horizontal loads on the cantilever (see [reference]). Figure 1A Furthermore, the user does not need to resist torque at the user's wrist. This improves the user's ability to accurately align the working end of the tool 100 relative to the workpiece and reduces muscle fatigue caused by repeated lifting and aligning of the tool 100.

[0040] The specific location of the center of gravity 118 is described below with reference to several points. For example, in one embodiment, the center of gravity 118 is closer to the activation button 184 along the longitudinal handle axis 138 than to the power supply portion 124 of the housing 104. Additionally, the center of gravity 118 is closer to the drive portion 128 of the housing 104 than to the power supply portion 124. Positioning the center of gravity 118 at the indicated location provides the aforementioned benefits.

[0041] In one embodiment, a plane 202 normal to the longitudinal handle axis 138 passes through the center of gravity 118. Furthermore, when the operator grips the handle portion 120 to activate the activation button 184, the plane 202 passes through the operator's thumb and forefinger. Positioning the center of gravity 118 along the longitudinal handle axis 138 close to the operator's thumb and forefinger provides the aforementioned benefits.

[0042] From another perspective, the center of gravity 118 is located along the drive longitudinal axis 146 between the safety switch 188 and the finger opening 136, thus providing the aforementioned benefits to the tool 100.

[0043] refer to Figure 5 The fastener driver tool 100 disclosed herein is sized to be used manually by any user (ranging from DIYers to professionals). Figure 5 Exemplary dimensions are shown, particularly indicating the position of the center of gravity 118 relative to the drive portion 128, the impact point 144, and the handle portion 120. Other dimensions are also possible regarding the size and type of the fastener allocated at the impact point 144.

[0044] In another embodiment, the drive mechanism 116 of tool 100 includes a motor 160 and a flywheel device (not shown), as described above in conjunction with the prior art tool T.

[0045] like Figure 6 As shown, another embodiment of the fastener-driven tool 100' includes a housing 104', a battery pack 108', a fastener case 112', a handle portion 120', a power supply portion 124', a drive portion 128', a finger opening 136', a longitudinal handle axis 138', a finger longitudinal axis 142', a drive longitudinal axis 146', and a plane 202'. The tool 100' includes a drive mechanism (not shown) substantially the same as the drive mechanism 116 of the tool 100. The tool 100' includes an activation button 184' through which the plane 202' extends. The center of gravity 118' of the fastener-driven tool 100' is optimally positioned to balance the tool 100' and reduce undesirable torque and cantilever loads of prior art tools T, thereby making the operation of the tool 100' of this disclosure more comfortable.

[0046] To optimally position the center of gravity 118' of tool 100', tool 100' integrates most of its drive mechanism into the barrel-shaped handle portion 120' of housing 104', such that the center of gravity 118' is located within the handle portion 120' of housing 104'. More specifically, in one embodiment, the center of gravity 118' is located in the area of ​​handle portion 120' that is engaged by the user's thumb and forefinger. The center of gravity 118' is aligned with the activation button 184' along the drive longitudinal axis 146'. A plane 202' extends through the center of gravity 118' and the activation button 184'. In one embodiment, the center of gravity 118' is located within the gearbox of tool 100' (not shown, but substantially the same as gearbox 164 of tool 100).

[0047] While this disclosure has been illustrated and described in detail in the accompanying drawings and the foregoing description, it should be considered illustrative rather than restrictive in nature. It is to be understood that only preferred embodiments are presented, and protection is intended for all changes, modifications, and further applications falling within the spirit of this disclosure.

Claims

1. A fastener driving tool, comprising: The housing has a handle portion located between the power supply section and the drive section; A drive mechanism comprising: (i) a motor; (ii) a gearbox operably connected to the motor; and (iii) an impact mechanism operably connected to the gearbox; A battery pack, which is received by the power supply section and configured to supply electrical energy to the motor; and A fastener holder, configured to hold a plurality of fasteners, is mounted on the housing and operatively connected to the impact mechanism. The motor and the gearbox are located in the handle portion of the housing. The impact mechanism is located in the drive portion of the housing. The impact mechanism is configured to impact a corresponding fastener among the plurality of fasteners using rotation caused by the gearbox, the gearbox being rotated by the motor. The center of gravity of the fastener driving tool is located within the handle portion.

2. The fastener driving tool according to claim 1, further comprising: An activation button, mounted on the housing, is configured to activate the drive mechanism for impacting the corresponding fastener. The handle portion defines the longitudinal handle axis. The center of gravity, along the longitudinal handle axis, is closer to the activation button than the power supply section.

3. The fastener driving tool according to claim 2, wherein: The plane normal to the longitudinal handle axis passes through the center of gravity, and When the operator holds the handle portion to activate the activation button, the flat surface also passes through the operator's thumb and forefinger.

4. The fastener driving tool according to claim 1, wherein, Compared to the power supply section, the center of gravity is closer to the drive section.

5. The fastener driving tool according to claim 1, wherein: The housing also defines a finger opening located between the handle portion and the fastener box.

6. The fastener driving tool according to claim 5, further comprising: The safety switch is mounted on the handle portion. The driving portion defines the driving longitudinal axis, and The center of gravity is located between the safety switch and the finger opening along the driving longitudinal axis.

7. The fastener driving tool according to claim 5, further comprising: An activation button, mounted on the housing, is configured to activate the drive mechanism for impacting the corresponding fastener. The drive section defines the drive longitudinal axis. The handle portion defines a handle longitudinal axis perpendicular to the drive longitudinal axis. The finger opening defines a longitudinal axis of the finger that is parallel to the longitudinal axis of the handle, and The longitudinal axis of the finger passes through the activation button.

8. The fastener driving tool according to claim 1, further comprising: The belt has a first end removably connected to the drive portion of the housing and a second end removably connected to the power supply portion of the housing.

9. The fastener driving tool according to claim 1, further comprising: A crank mechanism, operably connected to the gearbox and the impact mechanism, is configured to compress a spring in the drive mechanism using rotation caused by the gearbox. The crank mechanism is located at the interface between the handle portion and the drive portion within the housing.

10. A fastener driving tool, comprising: The housing has a handle portion located between the power supply section and the drive section; A drive mechanism comprising: (i) a motor; (ii) a gearbox operably connected to the motor; and (iii) an impact mechanism operably connected to the gearbox; A power source, which is received by the power supply section and configured to supply electrical energy to the motor; and A fastener holder, configured to hold a plurality of fasteners, is mounted on the housing and operatively connected to the impact mechanism. The motor and the gearbox are located in the handle portion of the housing. The impact mechanism is located in the drive portion of the housing. The impact mechanism is configured to impact a corresponding fastener among the plurality of fasteners using rotation caused by the gearbox, the gearbox being rotated by the motor. The center of gravity of the fastener driving tool is located inside the gearbox.

11. The fastener driving tool according to claim 10, further comprising: An activation button, mounted on the housing, is configured to activate the drive mechanism for impacting the corresponding fastener. The handle portion defines a longitudinal handle axis extending through the center of the gearbox. The center of gravity, along the longitudinal handle axis, is closer to the activation button than the power supply section.

12. The fastener driving tool according to claim 11, wherein: The plane normal to the longitudinal handle axis passes through the center of gravity, and When the operator holds the handle portion to activate the activation button, the flat surface also passes through the operator's thumb and forefinger.

13. The fastener driving tool according to claim 10, wherein, Compared to the power supply section, the center of gravity is closer to the drive section.

14. The fastener driving tool according to claim 10, wherein: The housing also defines a finger opening located between the handle portion and the fastener box.

15. The fastener driving tool according to claim 14, further comprising: The safety switch is mounted on the handle portion. The driving portion defines the driving longitudinal axis, and The center of gravity is located between the safety switch and the finger opening along the driving longitudinal axis.

16. The fastener driving tool according to claim 14, further comprising: An activation button, mounted on the housing, is configured to activate the drive mechanism for impacting the corresponding fastener. The drive section defines the drive longitudinal axis. The handle portion defines a handle longitudinal axis perpendicular to the drive longitudinal axis. The finger opening defines a longitudinal axis of the finger that is parallel to the longitudinal axis of the handle, and The longitudinal axis of the finger passes through the activation button.

17. The fastener driving tool according to claim 16, further comprising: The belt has a first end removably connected to the drive portion of the housing and a second end removably connected to the power supply portion of the housing.

18. The fastener driving tool according to claim 10, further comprising: A crank mechanism, operably connected to the gearbox and the impact mechanism, is configured to compress a spring in the drive mechanism using rotation caused by the gearbox. The crank mechanism is located at the interface between the handle portion and the drive portion within the housing.

19. The fastener driving tool according to claim 10, wherein, The power source is a removable battery pack.

20. The fastener driving tool according to claim 10, wherein, The power supply is configured to be connected to the main power supply.

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