Fastener driver

Abstract

A fastener driver, comprising: a striking assembly, comprising a striking member for reciprocatingly striking a fastener; and a drive assembly, comprising a gas spring mechanism that drives the striking member by means of air pressure. The gas spring mechanism at least comprises a first cylinder and a cylinder cover arranged coaxially; the tail end of the first cylinder is provided with a first fastening mechanism; the cylinder cover is correspondingly provided with a second fastening mechanism; and the first fastening mechanism and the second fastening mechanism form a detachable connection. The fastener driver facilitates operation and maintenance, and reduces requirements on the hands-on ability of a user.

Description

Fastener driver

[0001] This application claims priority to Chinese Patent Application No. 202510365692.8, filed with the Chinese Patent Office on March 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a power tool, such as a fastener driver. Background Technology

[0003] In practical production and daily life, nails are sometimes needed to connect or fix objects. Manual hammering would be labor-intensive and inefficient. Therefore, nail guns are commonly used to drive nails into the work surface. A nail gun acts as a fastener actuator, used to quickly drive nails into the work surface. Compressed air driven nail guns have a compressed air cylinder; the thrust generated by the extended piston rod acts as the driving force on the impact component, driving the nail into the work surface. Mechanical spring-driven nail guns have an impact spring (compression spring); after the impact spring is compressed, its restoring force acts as the driving force on the impact component, driving the nail into the work surface.

[0004] Among them, compressed air driven nail guns are prone to the following problems during use:

[0005] 1. During use, the grease in the cylinder of a nail gun will decrease due to the reciprocating motion of the rubber ring on the piston. In this case, it is necessary to add grease to the cylinder to increase lubrication.

[0006] 2. Wear on the cylinder of the nail gun can cause air leakage, in which case the cylinder needs to be replaced.

[0007] 3. The firing pin of the nail gun may wear out or break, in which case the firing pin needs to be replaced.

[0008] All of the above repairs and maintenance require opening the cylinder of the nail gun. With current technology, the casing must be opened first, followed by the cylinder. This necessitates the use of specialized tools and demands a high level of user skill, making the repairs quite difficult.

[0009] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0010] One objective of this application is to solve or at least alleviate some or all of the aforementioned problems.

[0011] A fastener driver includes: a striking assembly including a striking member that reciprocates to strike a fastener; a driving assembly including a gas spring mechanism that drives the striking member by air pressure; the gas spring mechanism includes at least a first cylinder and a cylinder head coaxially arranged; a first fastening mechanism is provided at the tail end of the first cylinder; a second fastening mechanism is correspondingly provided on the cylinder head; the first fastening mechanism and the second fastening mechanism form a detachable connection.

[0012] In some embodiments, the outer wall surface of the tail end of the first cylinder is provided with an external thread section; the cylinder head is provided with a corresponding internal thread section; the external thread section and the internal thread section constitute a detachable threaded fastening mechanism.

[0013] In some embodiments, the inner wall surface of the cylinder head is provided with a first annular sealing groove, and a first elastic sealing element is embedded in the first annular sealing groove.

[0014] In some embodiments, the outer wall surface of the tail end of the first cylinder is provided with a second annular sealing groove, and a second elastic sealing element is embedded in the second annular sealing groove.

[0015] In some embodiments, the inner wall surface of the tail end of the first cylinder is provided with an internal thread section; the cylinder head is correspondingly provided with an external thread section; the internal thread section and the external thread section constitute a detachable threaded fastening mechanism.

[0016] In some embodiments, the outer wall surface of the cylinder head is provided with a first annular sealing groove, and a first elastic sealing element is embedded in the first annular sealing groove.

[0017] In some embodiments, the inner wall surface of the tail end of the first cylinder is provided with a second annular sealing groove, and a second elastic seal is embedded in the second annular sealing groove.

[0018] In some embodiments, a cover is also included that at least partially covers the rear end of the cylinder head.

[0019] In some embodiments, the first fastening mechanism includes a snap-fit ​​structure; the second fastening mechanism includes a mating portion that can cooperate with the snap-fit ​​structure to form a connection.

[0020] A fastener driver includes: a striking assembly including a striking member that reciprocates to strike a fastener; a driving assembly including a gas spring mechanism that drives the striking member by air pressure; the gas spring mechanism includes at least a first cylinder and a cylinder head coaxially arranged; the first cylinder and the cylinder head are not connected by fasteners other than the first cylinder and the cylinder head.

[0021] In some embodiments, the tail end of the first cylinder is provided with a first fastening mechanism, and the cylinder head is provided with a corresponding second fastening mechanism; the first fastening mechanism and the second fastening mechanism form a detachable connection.

[0022] In some embodiments, the outer wall surface of the tail end of the first cylinder is provided with an external thread section; the cylinder head is provided with a corresponding internal thread section; the external thread section and the internal thread section constitute a detachable threaded fastening mechanism.

[0023] In some embodiments, the inner wall surface of the tail end of the first cylinder is provided with an internal thread section; the cylinder head is correspondingly provided with an external thread section; the internal thread section and the external thread section constitute a detachable threaded fastening mechanism.

[0024] In some embodiments, the first fastening mechanism includes a snap-fit ​​structure; the second fastening mechanism includes a mating portion that can cooperate with the snap-fit ​​structure to form a connection.

[0025] A fastener driver includes: a striking assembly including a striking member that reciprocates to strike a fastener; a driving assembly including a gas spring mechanism that drives the striking member by air pressure; the gas spring mechanism includes at least: a second cylinder and a first cylinder coaxially nested; a piston fixedly connected to the striking member is provided inside the second cylinder; the first cylinder is sleeved outside the second cylinder and axially communicates with the second cylinder through a ventilation channel; at least the first cylinder is configured as a cylindrical structure; the height difference between the outer walls of the first cylinder is less than or equal to 5 mm.

[0026] In some embodiments, the gas spring mechanism further includes a cylinder head, which is coaxially arranged with the first cylinder; a first fastening mechanism is provided at the tail end of the first cylinder; a second fastening mechanism is correspondingly provided on the cylinder head; the first fastening mechanism and the second fastening mechanism form a detachable connection.

[0027] In some embodiments, the gas spring mechanism further includes an annular connector, which is fixed to the outer wall surface of the front end of the second cylinder; the outer wall surface of the annular connector is provided with an outer engagement section; the inner wall surface of the front end of the first cylinder is correspondingly provided with an inner engagement section; the outer engagement section and the inner engagement section are detachably engaged.

[0028] In some embodiments, the outer wall of the annular connector is provided with a third annular sealing groove, and a third elastic sealing element is embedded in the third annular sealing groove.

[0029] In some embodiments, the tail end of the second cylinder forms an operating part for the user to screw the second cylinder.

[0030] In some embodiments, the wall thickness between the inner and outer walls of the first cylinder is less than or equal to 4 mm.

[0031] In some embodiments, the height difference between the outer wall surfaces of the first cylinder is less than or equal to 3 mm.

[0032] In some embodiments, the height difference between the inner wall surfaces of the first cylinder is less than or equal to 5 mm.

[0033] In some embodiments, the height difference between the inner wall surfaces of the first cylinder is less than or equal to 3 mm. Attached Figure Description

[0034] Figure 1 is a partial cross-sectional view of an embodiment of this application;

[0035] Figure 2 is a schematic diagram of an embodiment of this application;

[0036] Figure 3 is a partial cross-sectional view of an embodiment of this application with the cylinder head removed;

[0037] Figure 4 is a partially exploded view of an embodiment of this application;

[0038] Figure 5 is a front view of the first cylinder in one embodiment of this application;

[0039] Figure 6 is a cross-sectional view along direction AA in Figure 5;

[0040] Figure 7 is a side view of the first cylinder in one embodiment of this application.

[0041] In the picture:

[0042] 100. Fastener actuator; 110. Housing; 111. Cover; 1. Striking assembly; 11. Striking component; 12. Piston; 2. Drive assembly; 21. Gas spring mechanism; 211. First cylinder; 2111. Internal thread section; 2112. Internal engagement section; 212. Second cylinder; 2121. Annular connector; 21211. External engagement section; 2122. Third annular sealing groove; 2123. Operating part; 213. Vent passage; 214. Cylinder head; 2141. External thread section; 2142. First annular sealing groove; 215. First fastening mechanism; 216. Second fastening mechanism; 3. First elastic seal; 4. Third elastic seal. Detailed Implementation

[0043] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0044] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0045] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0046] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0047] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0048] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0049] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0050] Handheld power tools play a vital role in daily life and production. These tools include, but are not limited to, electric drills, impact drills, impact wrenches, impact screwdrivers, angle grinders, nail guns, and fastener actuators. Electric drills and impact drills can be configured with different diameter drill bits to drill holes in objects. Impact wrenches are used to tighten bolts and nuts, impact screwdrivers are typically used to loosen or tighten screws, and angle grinders can be used for grinding and cutting. Using handheld power tools can improve work efficiency and reduce labor intensity.

[0051] Figure 1 illustrates a fastener driver 100 according to an embodiment of this application. The fastener driver 100 is used to drive a fastener into a working surface. For example, the fastener is a nail, which can be a flathead nail or a U-shaped nail. The fastener driver 100 drives the fastener to quickly drive into the working surface, thereby fixing the working surface to a platform on the back side of the working surface. In this embodiment, the fastener driver 100 is, for example, a nail gun. Optionally, the fastener driver 100 is a cylinder-type nail gun that uses compressed gas in a cylinder to push out a firing component to perform the nailing action. In particular, a pre-charged nail gun is preferred.

[0052] The fastener driver 100 is powered by a rechargeable battery pack. In some embodiments, the battery pack is a battery module that, in conjunction with a corresponding power supply circuit, powers the fastener driver 100. Those skilled in the art will understand that in other embodiments, the fastener driver 100 may also be powered by other power supply devices. For example, the power supply may be an AC power line connected to mains power, or it may be other connecting cables that can be connected to a power supply device. Mains power or other power supply devices, in conjunction with corresponding rectification, filtering, and voltage regulation circuits, power the corresponding components of the fastener driver 100.

[0053] Fastener drivers are prone to failure after operating for a certain period of time, requiring the cylinder head to be opened for maintenance. To reduce the difficulty of maintenance and facilitate user operation, as shown in Figures 1-7, this application provides a fastener driver 100. The fastener driver 100 includes a striking component 1 and a driving component 2.

[0054] The striking assembly 1 includes a striking member 11 that reciprocates to strike the fastener. The driving assembly 2 includes a gas spring mechanism 21 that drives the striking member 11 by air pressure. The gas spring mechanism 21 includes at least a first cylinder 211 and a cylinder head 214 coaxially arranged. The tail end of the first cylinder 211 is provided with a first fastening mechanism 215, and the cylinder head 214 is correspondingly provided with a second fastening mechanism 216. The first fastening mechanism 215 and the second fastening mechanism 216 form a detachable connection. In some embodiments, a sealing element is also provided at the connection between the cylinder head 214 and the tail end of the first cylinder 211 to ensure that there is no air leakage after the two are connected.

[0055] When repairing the fastener driver 100, simply remove the second fastening mechanism 216 from the first fastening mechanism 215 to open the first cylinder 211 for maintenance. This simple operation facilitates maintenance and eliminates the need for specialized tools, reducing the skill requirements for users.

[0056] In some embodiments, the outer wall surface of the tail end of the first cylinder 211 is provided with an external thread section, and the cylinder head 214 is correspondingly provided with an internal thread section. The external thread section and the internal thread section constitute a detachable threaded fastening mechanism. By using the external thread section and the internal thread section for threaded connection, the first cylinder 211 and the cylinder head 214 can be stably connected while facilitating disassembly and assembly. When repairing the fastener driver 100, it is only necessary to rotate the cylinder head 214 off the first cylinder 211 to remove the striking member 11, wipe and apply grease to the inner wall of the first cylinder 211, and apply grease or replace the rubber ring on the piston 12.

[0057] In some embodiments, the inner wall surface of the cylinder head 214 is provided with a first annular sealing groove, and a first elastic sealing member 3 is embedded in the first annular sealing groove. Since the cylinder head 214 is fitted onto the tail end of the first cylinder 211, by providing the first elastic sealing member 3, when the cylinder head 214 is installed on the first cylinder 211, the first elastic sealing member 3 is compressed and deformed, which can seal the gap between the cylinder head 214 and the first cylinder 211. This ensures the airtightness between the cylinder head 214 and the first cylinder 211, preventing the compressed gas used to drive the striking member 11 from escaping through the gap between the cylinder head 214 and the first cylinder 211, which would reduce the striking force of the fastener driver 100. By providing the first annular sealing groove, it is convenient to install and position the first elastic sealing member 3. Furthermore, embedding the first elastic sealing member 3 in the first annular sealing groove can ensure the relative position of the first elastic sealing member 3 with respect to the cylinder head 214 is stable. The first elastic seal 3 can be made of rubber, such as nitrile rubber (NBR), silicone rubber (VMQ), or fluororubber (FKM), which has good elasticity and chemical resistance. Alternatively, the first elastic seal 3 can be made of polyurethane, which has high wear resistance and tear resistance, making it suitable for high-pressure environments.

[0058] In some embodiments, a second annular sealing groove is provided on the outer wall surface of the tail end of the first cylinder 211, and a second elastic seal is embedded in the second annular sealing groove. Since the cylinder head 214 is fitted onto the tail end of the first cylinder 211, by providing the second elastic seal, when the cylinder head 214 is installed on the first cylinder 211, the second elastic seal is compressed and deformed, which can seal the gap between the cylinder head 214 and the first cylinder 211. This ensures the airtightness between the cylinder head 214 and the first cylinder 211, preventing the compressed gas used to drive the striking member 11 from escaping through the gap between the cylinder head 214 and the first cylinder 211, thus reducing the striking force of the fastener driver 100. By providing the second annular sealing groove, it is convenient to install and position the second elastic seal. Furthermore, embedding the second elastic seal in the second annular sealing groove can ensure the relative position of the second elastic seal with respect to the first cylinder 211 is stable. The second elastic seal can be made of the same material as the first elastic seal 3, which will not be described in detail here.

[0059] As shown in Figures 1 and 3, in some embodiments, the inner wall surface of the tail end of the first cylinder 211 is provided with an internal thread section 2111; the cylinder head 214 is correspondingly provided with an external thread section 2141; the internal thread section 2111 and the external thread section 2141 constitute a detachable threaded fastening mechanism. Through the above arrangement, the first cylinder 211 and the cylinder head 214 are connected by a threaded connection, facilitating the assembly and disassembly of the cylinder head 214 and the first cylinder 211.

[0060] As shown in Figure 4, in some embodiments, the outer wall of the cylinder head 214 is provided with a first annular sealing groove 2142, and a first elastic sealing element 3 is embedded in the first annular sealing groove 2142. Since the cylinder head 214 passes through the tail end of the first cylinder 211, the first elastic sealing element 3 effectively seals the gap between the cylinder head 214 and the first cylinder 211, thereby preventing gas leakage and ensuring that the fastener driver 100 has sufficient striking force. Embedding the first elastic sealing element 3 into the first annular sealing groove 2142 facilitates the positioning and installation of the first elastic sealing element 3.

[0061] In some embodiments, the inner wall surface of the tail end of the first cylinder 211 is provided with a second annular sealing groove, and a second elastic seal is embedded in the second annular sealing groove. By providing the second elastic seal, the gap between the cylinder head 214 and the first cylinder 211 can be effectively sealed, thereby preventing gas leakage and ensuring that the fastener driver 100 has sufficient striking force. By embedding the second elastic seal in the second annular sealing groove, it is convenient to position and install the second elastic seal.

[0062] As shown in Figure 1, in some embodiments, the fastener driver 100 further includes a cover 111, which at least partially covers the tail end of the cylinder head 214. The cover 111 protects the cylinder head 214, preventing it from being directly impacted or subjected to shocks during operation of the fastener driver 100. The cover 111 can be integrally formed with the outer housing 110 of the fastener driver 100, ensuring a stable connection between the cover 111 and the housing 110 and facilitating manufacturing. In other embodiments, the cover 111 can be designed separately and installed on the housing 110 or the cylinder head 214 using screws. In one embodiment, removing the cover 111 allows the cylinder head 214 to be removed, enabling cylinder maintenance and greatly simplifying the maintenance process.

[0063] In some embodiments, the first fastening mechanism 215 includes a snap-fit ​​structure; the second fastening mechanism 216 includes a mating part that can cooperate with the snap-fit ​​structure to form a connection. The connection between the cylinder head 214 and the first cylinder 211 is achieved through the snap-fit ​​structure and the mating part. Multiple snaps are fixedly provided at the tail end of the first cylinder 211, and multiple slots are formed on the cylinder head 214, with each slot corresponding to one of the multiple snaps. When the cylinder head 214 is installed on the first cylinder 211, the snaps engage with the slots. This snap-fit ​​method facilitates the installation and removal of the cylinder head 214 from the first cylinder 211. In other embodiments, the snaps can also be fixedly provided on the cylinder head 214, and the slots can be formed on the first cylinder 211; no further limitations are imposed here.

[0064] As shown in Figures 1-4, this application also provides a fastener driver 100, which includes a striking component 1 and a driving component 2. The striking component 1 includes a striking member 11 that reciprocates to strike the fastener; the driving component 2 includes a gas spring mechanism 21 that drives the striking member 11 by air pressure. The gas spring mechanism 21 includes at least a first cylinder 211 and a cylinder head 214 coaxially arranged, wherein the first cylinder 211 and the cylinder head 214 are not connected by any fasteners other than the first cylinder 211 and the cylinder head 214.

[0065] By directly connecting the first cylinder 211 to the cylinder head 214, disassembly and assembly are facilitated, thereby simplifying maintenance of the fastener actuator 100. When repairing the fastener actuator 100, simply rotate the cylinder head 214 off the first cylinder 211 to remove the striking component 11, wipe and apply grease to the inner wall of the first cylinder 211, and apply grease or replace the rubber ring on the piston 12. Furthermore, since no other fasteners are required, costs are reduced, improving the economic efficiency of the fastener actuator 100.

[0066] As shown in Figures 1-7, this application also provides a fastener driver 100, which includes a striking component 1 and a driving component 2. The striking component 1 includes a striking element 11 that reciprocates to strike the fastener, and the driving component 2 includes a gas spring mechanism 21 that drives the striking element 11 by air pressure. The gas spring mechanism 21 includes at least a second cylinder 212 and a first cylinder 211 coaxially nested. The second cylinder 212 has a piston 12 fixedly connected to the striking element 11 inside; the first cylinder 211 is sleeved outside the second cylinder 212 and axially communicates with the second cylinder 212 through a ventilation channel 213. At least the first cylinder 211 is configured as a cylindrical structure, and the height difference between the outer walls of the first cylinder 211 is less than or equal to 5 mm. The height difference between the outer walls of the first cylinder 211 can be 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, etc., without further limitation. The height difference of the outer wall surface can be understood as the difference between the highest and lowest points of the outer wall surface. For example, if there are steps on the outer wall surface, the height of the steps is the height difference of the outer wall surface. Similarly, if there are grooves on the outer wall surface, the depth of the grooves is the height difference of the outer wall surface, or if there are protrusions on the outer wall surface, the height of the protrusions is the height difference of the outer wall surface.

[0067] The first cylinder 211 is open at both ends along the axial direction and is tubular. The height difference between the outer walls of the first cylinder 211 is less than or equal to 5mm, and it can be machined into shape using steel pipe by turning process, which greatly reduces the cost of the first cylinder 211 and thus improves the economy of the fastener driver 100.

[0068] As shown in Figures 1, 3, and 4, in some embodiments, the gas spring mechanism 21 further includes an annular connector 2121, which is fixedly disposed on the outer wall surface of the front end of the second cylinder 212. The outer wall surface of the annular connector 2121 has an outer engagement section 21211, and the inner wall surface of the front end of the first cylinder 211 correspondingly has an inner engagement section 2112. The outer engagement section 21211 and the inner engagement section 2112 are detachably screwed together. By using the screwed connection between the outer engagement section 21211 and the inner engagement section 2112, a stable connection between the first cylinder 211 and the second cylinder 212 can be ensured, and assembly or disassembly of the first cylinder 211 and the second cylinder 212 is facilitated. In one embodiment, the outer engagement section 21211 and the second cylinder 212 are an integrated structure, which ensures a stable connection between the outer engagement section 21211 and the second cylinder 212 and eliminates the need for assembly processes. In other embodiments, the outer rotating section 21211 and the second cylinder 212 can also be designed as separate structures, with the outer rotating section 21211 being assembled to the outer peripheral surface of the first cylinder 211 by bolts or welding. No further restrictions are imposed here.

[0069] As shown in Figures 3 and 4, in some embodiments, the outer wall of the annular connector 2121 is provided with a third annular sealing groove 2122, and a third elastic seal 4 is embedded in the third annular sealing groove 2122. The third annular sealing groove 2122 facilitates the installation and positioning of the third elastic seal 4. When the first cylinder 211 and the second cylinder 212 are assembled together through the outer rotating section 21211 and the inner rotating section 2112, the third elastic seal 4 is compressed and undergoes elastic deformation, thereby sealing the gap between the outer rotating section 21211 and the inner rotating section 2112 and preventing compressed gas leakage. The third elastic seal 4 and the first elastic seal 3 can be manufactured using the same material, which will not be elaborated further here.

[0070] As shown in Figure 4, in some embodiments, an operating portion 2123 for the user to rotate the second cylinder 212 is formed at the tail end of the second cylinder 212. By forming the operating portion 2123 at the tail end of the second cylinder 212, it is convenient for the user to rotate the second cylinder 212 during installation. The operating portion 2123 can be made of protrusions, grooves, and / or raised dots, which can improve the surface roughness of the operating portion 2123. This ensures friction between the user's hand and the operating portion 2123 during operation, preventing slippage.

[0071] As shown in Figure 6, in some embodiments, the wall thickness L1 between the inner and outer walls of the first cylinder 211 is less than or equal to 4 mm. The wall thickness L1 between the inner and outer walls of the first cylinder 211 can be 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, or 4 mm. The wall thickness L1 between the inner and outer walls of the first cylinder 211 only needs to ensure that it can be smoothly machined by turning processes; no further restrictions are imposed here. By limiting the wall thickness L1 between the inner and outer walls of the first cylinder 211, a lightweight design is achieved. This saves materials and reduces the weight of the fastener driver 100, making it easier for users to use and reducing the labor intensity of operation.

[0072] As shown in Figure 6, in some embodiments, the height difference of the outer wall surface of the first cylinder 211 is less than or equal to 3 mm. The height difference of the outer wall surface of the first cylinder 211 can be 0 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, etc., and is not limited in any particular way here. By limiting the height difference of the outer wall surface of the first cylinder 211, it is easier to machine the first cylinder 211 using turning processes, thereby reducing the cost of the first cylinder 211.

[0073] As shown in Figure 6, in some embodiments, the height difference L2 of the inner wall surface of the first cylinder 211 is less than or equal to 5 mm. The height difference L2 of the inner wall surface of the first cylinder 211 can be 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4.1 mm, etc. By limiting the height difference L2 of the inner wall surface of the first cylinder 211, it is easier to process the inner wall surface of the first cylinder 211, reducing the processing difficulty of the first cylinder 211.

[0074] As shown in Figure 6, in some embodiments, the height difference L2 of the inner wall surface of the first cylinder 211 is less than or equal to 3 mm. The height difference L2 of the inner wall surface of the first cylinder 211 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, etc. By further limiting the height difference L2 of the inner wall surface of the first cylinder 211, it is easier to process the inner wall surface of the first cylinder 211, further reducing the processing difficulty of the first cylinder 211.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A fastener driver, comprising: Impact components, including impact components that reciprocate to impact fasteners; The driving assembly includes a gas spring mechanism that drives the striking element by air pressure; The gas spring mechanism includes at least a first cylinder and a cylinder head arranged coaxially. The first cylinder is provided with a first fastening mechanism at its tail end; The cylinder head is provided with a second fastening mechanism; The first fastening mechanism and the second fastening mechanism form a detachable connection.

2. The fastener driver according to claim 1, wherein, The inner wall surface of the tail end of the first cylinder is provided with an internal thread section; the cylinder head is provided with a corresponding external thread section; the internal thread section and the external thread section constitute a detachable threaded fastening mechanism.

3. The fastener driver according to claim 2, wherein, The cylinder head outer wall is provided with a first annular sealing groove, and a first elastic sealing element is embedded in the first annular sealing groove.

4. The fastener driver according to claim 2, wherein, The inner wall of the tail end of the first cylinder is provided with a second annular sealing groove, and a second elastic sealing element is embedded in the second annular sealing groove.

5. The fastener driver according to claim 1, wherein, The outer wall surface of the tail end of the first cylinder is provided with an external thread section; the cylinder head is provided with an internal thread section; the external thread section and the internal thread section constitute a detachable threaded fastening mechanism.

6. The fastener driver according to claim 5, wherein, The cylinder head inner wall is provided with a first annular sealing groove, and a first elastic sealing element is embedded in the first annular sealing groove.

7. The fastener driver according to claim 5, wherein, The outer wall surface of the tail end of the first cylinder is provided with a second annular sealing groove, and a second elastic sealing element is embedded in the second annular sealing groove.

8. The fastener driver according to claim 1, wherein, It also includes a cover that at least partially covers the rear end of the cylinder head, and the cylinder head can be disassembled after the cover is removed.

9. The fastener driver according to claim 1, wherein, The first fastening mechanism includes a snap-fit ​​structure; the second fastening mechanism includes a mating part that can cooperate with the snap-fit ​​structure to form a connection.

10. The fastener driver according to claim 1, wherein, The gas spring mechanism further includes a second cylinder sleeved outside the first cylinder; the second cylinder is axially connected to the first cylinder through a ventilation channel.

11. The fastener driver according to claim 10, wherein, The height difference between the outer wall surfaces of the first cylinder is less than or equal to 5 mm.

12. The fastener driver according to claim 10, wherein, The wall thickness between the inner and outer walls of the first cylinder is less than or equal to 4 mm.

13. A fastener driver, comprising: Impact components, including impact components that reciprocate to impact fasteners; The driving assembly includes a gas spring mechanism that drives the striking element by air pressure; The gas spring mechanism includes at least a first cylinder and a cylinder head arranged coaxially. in, The first cylinder and the cylinder head are not connected by fasteners other than the first cylinder and the cylinder head.

14. The fastener driver according to claim 13, wherein, The first cylinder is provided with a first fastening mechanism at its tail end, and the cylinder head is provided with a corresponding second fastening mechanism; the first fastening mechanism and the second fastening mechanism form a detachable connection.

15. The fastener driver according to claim 13, wherein, The inner wall surface of the tail end of the first cylinder is provided with an internal thread section; the cylinder head is provided with a corresponding external thread section; the internal thread section and the external thread section constitute a detachable threaded fastening mechanism.

16. The fastener driver according to claim 13, wherein, The outer wall surface of the tail end of the first cylinder is provided with an external thread section; the cylinder head is provided with a corresponding internal thread section; the external thread section and the internal thread section constitute a detachable threaded fastening mechanism.

17. The fastener driver according to claim 14, wherein, The first fastening mechanism includes a snap-fit ​​structure; the second fastening mechanism includes a mating part that can cooperate with the snap-fit ​​structure to form a connection.

18. The fastener driver according to claim 1, wherein, The gas spring mechanism further includes a second cylinder sleeved outside the first cylinder; the second cylinder is axially connected to the first cylinder through a ventilation channel.

19. The fastener driver according to claim 18, wherein, The height difference between the outer wall surfaces of the first cylinder is less than or equal to 5 mm.

20. The fastener driver according to claim 18, wherein, The wall thickness between the inner and outer walls of the first cylinder is less than or equal to 4 mm.

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