Fastener driver

Abstract

The fastener driver comprises a striking assembly, an energy storage device and a buffering piece, the striking assembly comprises a piston, the energy storage device is arranged to drive the striking assembly to move to a lower dead center position so as to output striking force, and the energy storage device comprises a first air cylinder containing at least part of the piston; the buffering piece is arranged to be in contact with the striking assembly so that the striking assembly can stop at the position of a lower dead center; the buffer piece is provided with a first air channel, when the striking assembly moves to the bottom dead center position, air in a first cavity defined by the piston, the buffer piece and the first air cylinder is communicated with the atmosphere at least through the first air channel, and the air in the first cavity on the outer side of the buffer piece can be prevented from flowing backwards to enter the first air cylinder under the impact effect of the piston; the problem that the air pressure in the first air cylinder continuously rises along with the increase of the number of times of striking of the piston is avoided, the stability of the fastener driver is improved, the fastener driver is prevented from premature failure, the structure is simple and compact, the tool size is relatively small, and user operation is facilitated.

Description

Technical Field

[0001] The present application relates to the field of electric tools, and in particular to a fastener driver. Background Art

[0002] The fastener driver in the related art is usually used to fix the workpiece. The user shoots the fastener into the workpiece to fix the workpiece. The fastener driver includes an energy storage cylinder, a piston and a buffer. The energy storage cylinder accommodates at least part of the piston, and the piston can slide along its axial direction relative to the energy storage cylinder. The buffer is installed at the opening of the energy storage cylinder to limit the maximum displacement of the piston. Due to the need for the deformation of the buffer, the buffer and the inner wall of the energy storage cylinder cannot be completely in close contact. Therefore, there is a certain gap between the outer wall of the buffer and the inner wall of the energy storage cylinder for the deformation of the buffer. When the piston contacts the buffer, the buffer, the piston and the inner wall of the energy storage cylinder cooperate to form a first chamber, and the first chamber will inevitably be filled with gas. During the operation of the fastener driver, the gas in the first chamber will cause the parts to fail and reduce the working quality of the fastener driver.

[0003] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, the object of the present application is to provide a fastener driver with better stability.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A fastener driver comprising:

[0007] a striking assembly, including a piston;

[0008] An energy storage device, configured to drive the striking assembly to move to a bottom dead center position to output striking force, the energy storage device comprising a first cylinder accommodating at least a portion of the piston;

[0009] A buffer member, configured to contact the striking assembly to stop the striking assembly at the bottom dead center position;

[0010] The buffer has a first air passage, and when the striking assembly moves to the bottom dead center position, the gas in the first chamber defined by the piston, the buffer and the first cylinder is communicated with the atmosphere at least through the first air passage.

[0011] As an optional solution of the fastener driver, the piston has a second air passage, and the second air passage connects the first chamber and the first air passage.

[0012] As an optional solution of the fastener driver, the second air channel includes an inlet and an outlet, the inlet is located on the side wall of the piston and communicates with the first chamber, and the outlet is located on the end wall of the piston and communicates with the first air channel.

[0013] As an optional solution of the fastener driver, there are a plurality of second air passages, and the plurality of second air passages are arranged at intervals along the circumference of the piston.

[0014] As an optional solution of the fastener driver, the diameter of the inlet is greater than or equal to 2 mm.

[0015] As an optional solution of the fastener driver, the striking assembly further includes a firing pin, the buffer member is provided with a through hole for the firing pin to pass through, one end of the firing pin passes through the through hole and is installed on the piston, and the through hole forms the first air passage.

[0016] As an optional solution for the fastener driver, the piston includes a guide portion and a protrusion protruding from the end surface of the guide portion, the guide portion slidingly cooperates with the inner wall of the first cylinder, and when the piston is at the bottom dead center position, the end surface of the guide portion contacts the buffer member, and the protrusion extends into the first air passage.

[0017] As an optional solution of the fastener driver, the diameter of the buffer is greater than or equal to 47 mm and less than or equal to 57 mm.

[0018] As an optional solution of the fastener driver, when the gas pressure in the first chamber is greater than the atmospheric pressure, at least a portion of the gas in the first chamber flows sequentially through the second gas passage and the first gas passage to the atmosphere.

[0019] As an optional solution of the fastener driver, the energy storage device further includes a second cylinder, at least a portion of the first cylinder is accommodated in the second cylinder, and a portion of the outer wall of the first cylinder is sealingly matched with the inner wall of the second cylinder.

[0020] The benefit of the present application lies in that the fastener driver provided by the present application can prevent the gas in the first chamber outside the buffer from flowing back into the first cylinder under the impact of the piston, thereby avoiding the problem of the gas pressure in the first cylinder continuously increasing with the increase in the number of piston strikes, improving the stability of the fastener driver, preventing the fastener driver from failing prematurely, and the structure is simple and compact, so that the tool size is relatively small, which is convenient for users to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a fastener driver according to an embodiment of the present application;

[0022] Figure 2 yes Figure 1 A cross-sectional view of a fastener driver in FIG.

[0023] Figure 3 is a cross-sectional schematic diagram of an energy storage device and a striking assembly of a fastener driver provided by an embodiment;

[0024] Figure 4 yes Figure 3 A schematic diagram of the structure of the piston of the middle striking assembly;

[0025] Figure 5 yes Figure 3 Partial enlarged view of the striking component and buffer ( Figure 5 The direction of the middle dotted line represents the direction of gas flow);

[0026] Figure 6 yes Figure 3 A top view of the middle piston;

[0027] Figure 7 is a cross-sectional view of an energy storage device and a striking assembly of a fastener driver provided in another embodiment;

[0028] Figure 8 yes Figure 7 A schematic diagram of the structure of the energy storage device and the striking assembly;

[0029] Fig. 9 is a cross-sectional view of an energy storage device and a striking assembly of a fastener driver provided in yet another embodiment;

[0030] Fig.10 yes Fig. 9 Schematic diagram of the structure of the energy storage device and the striking component.

[0031] Reference numerals:

[0032] 100, housing; 101, main housing; 102, transmission part; 103, gripping part; 1031, trigger; 104, joint part;

[0033] 200, Magazine;

[0034] 300, buffer member; 301, through hole;

[0035] 400, striking assembly; 401, piston; 402, firing pin;

[0036] 500. Energy storage device;

[0037] 1. first chamber; 11. piston; 110. second air passage; 1101. first air path; 1102. second air path; 1103. inlet; 1104. outlet; 111. guide portion; 112. protrusion; 113. receiving groove; 12. striker; 13. first cylinder; 14. second cylinder; 15. sealing member; 16. sliding ring; 161. notch;

[0038] 2. First chamber; 21. Piston; 22. Strike pin; 23. First cylinder; 24. Second cylinder; 25. Seal; 26. Bracket; 261. Third air passage;

[0039] 3. First chamber; 31. Piston; 32. Strike pin; 33. First cylinder; 34. Second cylinder; 36. Bracket; 360. Fourth air passage; 361. Concave portion; 37. Limiting ring; 371. Main body; 372. Connecting portion; 3721. First connecting groove; 3722. Second connecting groove. DETAILED DESCRIPTION

[0040] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0041] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0042] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0043] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0044] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus 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. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0045] In this application, it will be understood by those skilled in the art 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.

[0046] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0047] The technical solution of the present application is further explained below in conjunction with the accompanying drawings and through specific implementation methods.

[0048] When users assemble furniture parts or other workpieces, they usually need to use a fastener driver, which can generate a striking force on the fastener, thereby striking the fastener into the workpiece to fix the workpiece. For example, the fastener driver can be an electric tool such as a nail gun, and the fastener driver can be a pre-filled double-cylinder fastener driver. The fastener driver can also be a single-cylinder fastener driver, a double-cylinder fastener driver, a pre-filled fastener driver, a non-pre-filled fastener driver, a spring-type fastener driver, etc., which are not limited here.

[0049] Figure 1 A schematic structural diagram of a fastener driver provided in this embodiment is shown. Figure 2 Shows Figure 1 A cross-sectional view of a fastener driver. Figure 1 to Figure 2 As shown, the fastener driver includes a housing 100, a magazine 200, a striking assembly 400, an energy storage device 500 and a driving device (not shown in the figure), the housing 100 is used to accommodate and support a portion of the striking assembly 400, at least a portion of the energy storage device 500 and at least a portion of the driving device, and at least a portion of the magazine 200 is arranged on the outside of the housing 100. The magazine 200 is used to accommodate fasteners and supply the fasteners to the striking assembly 400. The energy storage device 500 drives the striking assembly 400 to move forward to output a striking force so that the striking assembly 400 can strike the fastener into the workpiece. The driving device drives the striking assembly 400 to move backward to store energy for the energy storage device 500. Among them, "the striking assembly 400 moves forward" refers to the striking assembly 400 moving in a direction close to the workpiece. "The striking assembly 400 moves backward" refers to the striking assembly 400 moving in a direction away from the workpiece. The striking assembly 400 has a striking position and an energy storage position during operation. For the convenience of description, the striking position of the striking assembly 400 is recorded as the lower dead center position of the striking assembly 400 moving forward, and the energy storage position of the striking assembly 400 is recorded as the upper dead center position of the striking assembly 400 moving backward.

[0050] In some embodiments, the fastener may be a nail. The size of the nail may be 15Ga, 16Ga, 18Ga, 23Ga, 25Ga, etc., which are not limited here. The use angle of the nail may be 0 degrees, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, etc., which are not limited here. The nail may be a straight nail, a U-shaped nail, etc., which are not limited here.

[0051] The housing 100 includes a main housing 101, a transmission part 102, and a grip part 103 for a user to hold. A storage space is formed inside the main housing 101 to hold and support at least a portion of the striking assembly 400 and at least a portion of the energy storage device 500. A storage space is formed inside the transmission part 102 to hold and support the driving device. One end of the grip part 103 is connected to the main housing 101. A trigger 1031 is provided on the grip part 103. The trigger 1031 is connected to the main switch of the fastener driver. The user can trigger the main switch by pulling the trigger 1031 to control the start and stop of the fastener driver.

[0052] In some embodiments, the driving device includes a motor and a transmission mechanism, the motor provides power to the transmission mechanism, and the transmission mechanism can convert the power provided by the motor into power for the striking assembly 400 to move backward. The motor can be an AC, DC or AC-DC dual-purpose motor, which is not limited here. The housing 100 also includes a coupling portion 104, which is connected to the other end of the grip portion 103 and is used to access a DC or AC power supply. For example, the coupling portion 104 can be used to install a battery pack, which can be detachably installed or non-detachably installed. The battery pack can be used with an external power supply or independently. The specifications and power of the battery pack are not limited here. The striking assembly 400 includes a piston 401 and a striker 402, and the striker 402 is installed on the piston 401. The striker 402 is provided with a plurality of meshing teeth, and the plurality of meshing teeth are arranged on the striker 402 at substantially equal distances along the length direction of the striker 402. The plurality of meshing teeth are protrudingly arranged and are wavy as a whole. The transmission mechanism includes a gear transmission assembly and a driving member, and the driving member is provided with a plurality of driving teeth arranged at intervals along the circumferential direction, and the driving teeth are meshed with the meshing teeth. During operation, the gear transmission assembly converts the power provided by the motor into the rotation of the driving member. When the driving member rotates, the driving teeth and the meshing teeth can cooperate to convert its own rotation into the movement of the striker 402, that is, the driving member can drive the striker 402 to move backward to the top dead center position of the striking assembly 400. In some embodiments, the gear transmission assembly includes a multi-stage planetary gear, and the multi-stage planetary gear includes at least two stages of planetary gears. Each stage of the planetary gear adopts the same number of teeth, module, size and transmission ratio to reduce manufacturing costs.

[0053] After completing the strike, the striker 402 stays in the stop position to wait for the user to press the trigger 1031 next time to strike the next fastener. In some embodiments, when the trigger 1031 is pressed, each time the safety switch is turned on, the striker 402 strikes a fastener. After the striker 402 completes a strike, the fasteners in the magazine 200 are replenished to the front end of the striker 402, waiting to be struck out by the striker 402. The striking assembly 400 reciprocates under the drive of the driving device and the energy storage device 500 to continuously strike the fasteners in sequence. In each striking cycle, the fastener driver will eject a fastener.

[0054] Figure 3 FIG. 2 shows a cross-sectional view of an energy storage device and a striking assembly of a fastener driver provided in an embodiment. Figure 3 As shown, the energy storage device includes a first cylinder 13, and the striking assembly includes a piston 11 and a striker 12. At least a portion of the piston 11 is in sealing and sliding cooperation with the inner wall of the first cylinder 13, and the piston 11 can move in the first cylinder 13 in the front-to-back direction. The front end of the piston 11 is connected to the striker 12, and the striker 12 cooperates with the transmission mechanism. The transmission mechanism can enable the striker 12 to drive the piston 11 to move from the bottom dead center position of the striking assembly to the top dead center position of the striking assembly, so that the energy storage device can store energy. The energy storage device is used to drive the piston 11 to move from the top dead center position of the striking assembly to the bottom dead center position of the striking assembly to output striking force.

[0055] For the convenience of description, the top dead center position of the striking assembly can also be described as the top dead center position of the piston 11 and / or the top dead center position of the striker 12, and the bottom dead center position of the striking assembly can also be described as the bottom dead center position of the piston 11 and / or the bottom dead center position of the striker 12. It can be understood that the spatial position of the top dead center position of the piston 11 is different from the spatial position of the top dead center position of the striker 12, and the spatial position of the bottom dead center position of the piston 11 is different from the spatial position of the bottom dead center position of the striker 12, but the relative position of the piston 11 and the striker 12 remains unchanged during the movement of the piston 11 and the striker 12, that is, when the piston 11 is at the top dead center position, the striker 12 must be at the top dead center position, and when the piston 11 is at the bottom dead center position, the striker 12 must be at the bottom dead center position.

[0056] The energy storage device also includes a second cylinder 14, in which at least part of the first cylinder 13 is accommodated, and part of the outer wall of the first cylinder 13 is sealed with the inner wall of the second cylinder 14. By providing the second cylinder 14, a greater striking force can be provided for the forward movement of the piston 11, thereby improving the applicable scenarios of the fastener driver. In this embodiment, the energy storage device is a pre-charged double-cylinder energy storage device, in which the first cylinder 13 is connected to the second cylinder 14, and the tail of the first cylinder 13 is an open structure. In some embodiments, an exhaust hole is provided on the cylinder wall of the first cylinder 13 to communicate with the second cylinder 14. When the product leaves the factory, compressed gas will be filled into the second cylinder 14 and the first cylinder 13 from the air valve of the second cylinder 14. When the piston 11 moves from the bottom dead center position to the top dead center position under the action of the driving device, the gas in the first cylinder 13 will enter the second cylinder 14 through the exhaust hole, and the air pressure in the second cylinder 14 and the first cylinder 13 will increase to stop the piston 11 at the top dead center position, and the energy storage device will be stored in this process. When it is necessary to strike the assembly to eject the fastener, the transmission mechanism of the driving device is first disengaged from the striker 12, and the piston 11 can move from the top dead center position to the bottom dead center position under the action of the air pressure in the second cylinder 14 and the first cylinder 13, and the striking force is provided to the striker 12. In this process, the air pressure in the first cylinder 13 and the second cylinder 14 is restored to the pre-charged air pressure.

[0057] The fastener driver further includes a buffer 300, which is configured to contact the striking assembly so that the striking assembly stops at the bottom dead center position. In this embodiment, the buffer 300 is installed at the front end opening of the first cylinder 13, and the striker 12 can pass through the buffer 300 and extend out of the housing 100. In order to reduce the friction between the striker 12 and the buffer 300 when the striker 12 moves between the top dead center position and the bottom dead center position, the buffer 300 is provided with a through hole 301 that runs through the axial direction thereof, and the outer wall of the striker 12 is spaced from the inner wall of the through hole 301. When the piston 11 moves forward to the bottom dead center position, the front end surface of the piston 11 can contact the buffer 300, the piston 11 stops moving forward, and the striker 12 basically moves to the most forward position it can move to, that is, the striker 12 is at the bottom dead center position. It should be noted that from the contact between the piston 11 and the buffer 300 so that the buffer 300 begins to deform, to the stop of the movement of the piston 11, the piston 11 is considered to be at the bottom dead center position.

[0058] Figure 4 Shows Figure 3 The structural diagram of the piston 11 is shown in FIG. Figure 4 Combination Figure 3As shown, the piston 11 includes a guide portion 111 and a protrusion 112 protruding from the end surface of the guide portion 111. The guide portion 111 is slidably matched with the inner wall of the first cylinder 13 so that the piston 11 can stably move between the top dead center position and the bottom dead center position. When the piston 11 is at the bottom dead center position, the end surface of the guide portion 111 contacts the buffer 300, and the protrusion 112 extends into the through hole 301, so that the protrusion 112 provides limited support for the buffer 300, so that the buffer 300 is deformed within a limited range, and the buffer 300 is prevented from deforming and blocking the through hole 301. In this embodiment, the protrusion is a truncated cone structure, which can facilitate the protrusion 112 to be smoothly inserted into the through hole 301 of the buffer 300, and at the same time, the outer wall of the protrusion 112 can provide limited support for the buffer 300, so that the buffer 300 is deformed within a limited space.

[0059] Due to the need for the buffer 300 to deform, the buffer 300 and the inner wall of the first cylinder 13 cannot be completely in close contact. Therefore, there is a certain gap between the outer wall of the buffer 300 and the inner wall of the first cylinder 13 for the buffer 300 to deform. When the piston 11 contacts the buffer 300, the buffer 300, the piston 11 and the inner wall of the first cylinder 13 cooperate to form the first chamber 1, and the first chamber 1 will inevitably be filled with gas. It can be understood that in this embodiment, the first chamber 1 is an annular chamber. During the operation of the fastener driver, the high pressure generated by the forward movement of the piston 11 to impact the buffer 300 makes it easy for the gas in the first chamber 1 to flow back into the first cylinder 13. This causes the air pressure in the first cylinder 13 to increase continuously with the increase in the number of nails, thereby affecting the stability of the fastener driver and causing the working quality of the fastener driver to gradually decrease. The increase in air pressure in the first cylinder 13 may also cause safety hazards such as overpressure explosion of the first cylinder 13 and injury to people when the fastener is ejected. Furthermore, the increasing striking force causes the buffer 300 to overheat, shortening the life of the buffer 300 and thereby shortening the service life of the fastener driver.

[0060] Based on the above problems, the structure of the fastener driver needs to be adjusted so that when the piston 11 contacts the buffer 300, the air in the first chamber 1 is discharged to the outside atmosphere to prevent the air in the first chamber 1 from flowing back into the first cylinder 13, thereby ensuring the stability of the fastener driver. This embodiment provides some technical solutions to solve or alleviate the above problems, which are as follows:

[0061] Figure 5 Shows Figure 3 A partial enlarged view of the striking component and the buffer. Figure 6 Shows Figure 3 Top view of the piston. Figure 5 to Figure 6 Combined with Figure 4As shown, the buffer 300 has a first air channel. When the striking assembly approaches or moves to the bottom dead center position, the gas in the first chamber 1 defined by the piston 11, the buffer 300 and the first cylinder 13 is connected to the atmosphere at least through the first air channel. The gas in the first chamber 1 flows out to the atmosphere through the first air channel to solve or alleviate the problem that the air pressure in the first cylinder 13 increases with the increase in the number of nails. In this embodiment, the through hole 301 on the buffer 300 defines the formation of the first air channel. In other words, the buffer 300 is coaxially arranged with the piston 11, and the first air channel (through hole 301) passes through the buffer 300 along the axial direction of the buffer 300. In other embodiments, the buffer 300 can also be provided with a first air channel arranged in parallel with the through hole 301, and the first air channel is connected to the outside atmosphere.

[0062] The piston 11 has a second air passage 110, which connects the first chamber 1 and the first air passage. When the piston 11 moves forward to contact the buffer 300, the gas in the first chamber 1 defined by the piston 11, the buffer 300 and the inner wall of the first cylinder 13 can flow from the second air passage 110 into the first air passage (through hole 301), and then be discharged from the first air passage (through hole 301) to the outside atmosphere. Figure 5 The direction of the dashed line head represents the direction of gas flow. After the first chamber 1 is formed, the piston 11 continues to move toward the buffer 300, and the volume of the first chamber 1 decreases. When the air pressure in the first chamber 1 is greater than the atmospheric pressure, there is an air pressure difference between the first chamber 1 and the atmosphere, and at least part of the gas in the first chamber 1 flows through the second air channel 110 and the first air channel (through hole 301) to the atmosphere in sequence, preventing the gas in the first chamber 1 from entering the first cylinder 13, thereby ensuring the stability of the first cylinder 13.

[0063] The second air channel 110 includes an inlet 1103 and an outlet 1104. The inlet 1103 is located on the side wall of the piston 11 and communicates with the first chamber 1, and the outlet 1104 is located on the end wall of the piston 11 and communicates with the first air channel (through hole 301). Providing the inlet 1103 of the second air channel 110 on the side wall of the piston 11 can prevent the inlet 1103 of the second air channel 110 from being blocked when the buffer 300 is squeezed and deformed, thereby ensuring that the gas in the first chamber 1 can enter the second air channel 110 from the inlet 1103 and enter the first air channel (through hole 301) from the outlet 1104 of the second air channel 110. The caliber of the inlet 1103 is greater than or equal to 2 mm, which can prevent the lubricating oil between the piston 11 and the first cylinder 13 from blocking the inlet 1103. In this embodiment, the caliber of the inlet 1103 is greater than or equal to 3 mm and less than or equal to 4 mm. In this way, liquid or solid lubricating oil is not easy to clog the inlet 1103, and the structure of the piston 11 is compact. The diameter of the second air channel 110 is slightly smaller than the diameter of the inlet 1103. The diameter of the second air channel 110 is greater than or equal to 2mm and less than or equal to 2.5mm. In some embodiments, the diameter of the second air channel 110 may also be equal to or greater than the diameter of the inlet 1103, and the diameter of the second air channel 110 may also be variable along its length. In some embodiments, the aperture of the inlet 1103 may be greater than the aperture of the outlet 1104.

[0064] In this embodiment, the second gas channel 110 includes a first gas path 1101 and a second gas path 1102, and the first gas path 1101 and the second gas path 1102 are vertically connected, wherein the first gas path 1101 extends in the radial direction of the piston 11, and the inlet of the first gas path 1101 is the inlet 1103 of the second gas channel 110, and the second gas path 1102 extends in the axial direction of the piston 11, and the outlet of the second gas path 1102 is the outlet 1104 of the second gas channel 110. It can be understood that the outlet of the second gas path 1102 needs to avoid the striker 12 to ensure that the gas flowing out of the outlet 1104 of the second gas channel 110 can be smoothly discharged into the outside through the first gas channel (through hole 301). The first gas path 1101 of the second gas channel 110 is located on the guide portion 111, and the inlet 1103 of the second gas channel 110 is located on the side wall of the guide portion 111, so as to prevent the buffer 300 from deforming and blocking the inlet 1103 of the second gas channel 110. Part of the second gas path 1102 of the second gas channel 110 is located on the protruding portion 112, and the outlet of the second gas channel 110 is located on the front end surface of the protruding portion 112, so that the gas flowing out of the outlet 1104 can smoothly enter the first gas channel (through hole 301).

[0065] In order to improve the efficiency of the gas in the first chamber 1 being discharged from the first gas channel (through hole 301), the number of the second gas channels 110 is a plurality, and the plurality of second gas channels 110 are arranged at intervals along the circumference of the piston 11. In this embodiment, the number of the second gas channels 110 is two, and the two second gas channels 110 are symmetrically arranged on the piston 11. Of course, in other embodiments, the number of the second gas channels 110 can also be any number such as three, four, five, six, etc., and can be specifically designed according to needs and the size of the piston 11, and is not limited here.

[0066] The side wall of the piston 11 is provided with a receiving groove 113, and at least two receiving grooves 113 are arranged at intervals along the circumference of the piston 11, wherein a part of the receiving grooves 113 is used to receive the seal 15, and the other part of the receiving grooves 113 is used to receive the sliding ring 16. The sealing member 15 is used to achieve the sealing between the side wall of the piston 11 and the working chamber of the first cylinder 13, so as to ensure that the first cylinder 13 can work normally. The sliding ring 16 is used to ensure that the piston 11 can slide relative to the first cylinder 13 along its axial direction. In other words, the guide portion 111 of the piston 11 is sealed with the inner wall of the first cylinder 13 only at the seal 15, and the guide portion 111 of the piston 11 is gap-matched with the inner wall of the first cylinder 13 at the sliding ring 16, so that the piston 11 can slide relative to the first cylinder 13.

[0067] In this embodiment, three receiving grooves 113 arranged along the axial direction are provided on the side wall of the guide portion 111 of the piston 11, and a sealing member 15 is provided in one of the receiving grooves 113. The sealing member 15 can be deformed under the action of the inner wall of the first cylinder 13 and the bottom wall of the receiving groove 113 to ensure the seal between the first cylinder 13 and the side wall of the guide portion 111. Sliding rings 16 are provided in the other two receiving grooves 113, and the two sliding rings 16 are respectively located on both sides of the sealing member 15. In other words, the front and rear ends of the guide portion 111 of the piston 11 are both provided with sliding rings 16, and the sliding rings 16 can be matched with the inner wall of the first cylinder 13 in a clearance, which can not only support the guide portion 111 of the piston 11, but also ensure that the guide portion 111 of the piston 11 can slide stably along its axial direction relative to the first cylinder 13. In other embodiments, the number of the receiving grooves 113 is not limited to three, but may be any number such as four, five, six, seven, etc. Preferably, the front and rear ends of the guide portion 111 each have at least one receiving groove 113 for receiving the sliding ring 16, and the guide portion 111 has at least one receiving groove 113 for receiving the seal 15, which will not be illustrated one by one here.

[0068] The sliding ring 16 has a notch 161, so that the sliding ring 16 can be opened at the notch 161 and installed in the receiving groove 113 at the guide portion 111 of the piston 11. In some embodiments, the sliding ring 16 can be a plastic sliding ring, which is not only light in weight and low in cost, but also easy to assemble the sliding ring 16 and the piston 11, thereby improving the convenience of assembly.

[0069] In this embodiment, the inlet 1103 of the second air channel 110 is located on the bottom wall of the receiving groove 113. The receiving groove 113 with the inlet 1103 is used to accommodate the sliding ring 16, so that the sliding ring 16 can be prevented from blocking the inlet 1103 and the inlet 1103 can be ensured to always communicate with the first chamber 1. It should be noted that in order to ensure that the piston 11 can stably slide relative to the first cylinder 13, the sliding ring 16 on the piston 11 and the inner wall of the first cylinder 13 are clearance-matched, and because the sliding ring 16 is a rigid structure, the inlet 1103 on the bottom wall of the receiving groove 113 corresponding to the sliding ring 16 can always be connected with the first chamber 1 through the gap between the sliding ring 16 and the inner wall of the first cylinder 13, so that the gas in the first chamber 1 can smoothly flow from the inlet 1103 into the second air channel 110. In some embodiments, the inlet 1103 can also be directly set on the side wall of the piston 11 or other positions. Due to the compressible nature of gas, even if the gap between the piston 11 and the inner wall of the first cylinder 13 is very small, or the gap between the inlet 1103 and the sliding ring 16 is very small, the gas in the first chamber 1 can enter the second gas channel 110 through the inlet 1103. In particular, when the air pressure in the first chamber 1 is relatively high, the gas in the first chamber 1 can preferentially enter the second gas channel 110 through the inlet 1103, and will not pass over the seal 15 and enter the first cylinder 13.

[0070] In addition, it can be understood that the notch 161 on the sliding ring 16 can connect the first chamber 1 with the receiving groove 113 corresponding to the sliding ring 16 to a certain extent, and a part of the gas in the first chamber 1 can enter the receiving groove 113 through the notch 161 on the sliding ring 16, and then flow to the inlet 1103 on the bottom wall of the receiving groove 113 to enter the second air channel 110, and finally enter the first air channel (through hole 301) from the outlet 1104 of the second air channel 110 and then be discharged into the atmosphere.

[0071] The buffer 300 can be made of rubber material, which can provide a buffer force for the piston 11, and at the same time reduce the impact sound between the piston 11 and the buffer 300, thereby improving the product usage experience. By reserving an airway for exhausting gas on the piston 11, the structure and size of other parts of the fastener driver do not need to be changed, especially the structure of the buffer 300, the piston 11, and the bracket 26 can be designed to be compact, so that the radial and axial structures of the fastener driver are compact. The diameter of the buffer 300 is greater than or equal to 47 mm and less than or equal to 57 mm. It can be understood that the smaller the diameter of the buffer 300, the more compact its structure in the radial direction, but the smaller the diameter of the buffer 300, the weaker the buffer effect of the buffer 300. In order to take into account both compact structure and buffering effect, in some embodiments, the diameter of the buffer 300 is preferably any value between 50mm-54mm. In other embodiments, the diameter of the buffer 300 is preferably any value between 51mm-53mm, such as 50mm, 50.5mm, 51mm, 51.5mm, 52mm, 52.5mm, 53mm, 53.5mm, and 54mm.

[0072] Figure 7 A cross-sectional view of an energy storage device and a striking assembly of a fastener driver provided in another embodiment is shown. Figure 8 Shows Figure 7 The schematic diagram of the structure of the energy storage device and the striking component. Figures 7 and 8 As shown, the fastener driver further includes a buffer 300, which is arranged to contact the striking assembly to stop the striking assembly at the bottom dead center position. The energy storage device includes a first cylinder 23 and a second cylinder 24, at least a portion of the first cylinder 23 is accommodated in the second cylinder 24, and a portion of the outer wall of the first cylinder 23 is sealed with the inner wall of the second cylinder 24, and the air pressure in the energy storage device can stably stop the striking assembly at the top dead center position.

[0073] The striking assembly includes a piston 21 and a striker 22. At least a portion of the piston 21 is sealed and slidably matched with the inner wall of the first cylinder 23, and the piston 21 can move in the first cylinder 23 in the front and rear directions. The front end of the piston 21 is connected to the striker 22. The buffer 300 has a through hole 301 for the striker 22 to pass through. One end of the striker 22 passing through the through hole 301 cooperates with the transmission mechanism. The transmission mechanism can enable the striker 22 to push the piston 21 from the bottom dead center position to the top dead center position, so that the energy storage device can store energy. The energy storage device is used to move the piston 21 from the top dead center position to the bottom dead center position to provide the piston 21 and the striker 22 with a striking force for forward movement.

[0074] The striking assembly, transmission mechanism and energy storage device provided by this technical solution are similar in structure and working principle to those provided by the above technical solution, and will not be described in detail here. The main difference between the fastener driver provided by this technical solution and the fastener driver provided by the above technical solution is that the gas in the first chamber 2 defined by the buffer 300, the piston 21 and the first cylinder 23 is connected to the outside atmosphere in a different manner.

[0075] Continue as Figures 7 and 8 As shown, the fastener driver also includes a bracket 26, the bracket 26 is fixed to the front end opening of the first cylinder 23, and the buffer 300 is fixed in the bracket 26. The buffer 300 is used to contact the piston 21 to stop the piston 21 at the bottom dead center position. The bracket 26 has a third air channel 261 connecting the first chamber 2 and the outside atmosphere. When the piston 21 contacts the buffer 300, the gas in the first chamber 2 can be discharged from the third air channel 261 to the outside atmosphere, thereby preventing the gas in the first chamber 2 from flowing back into the first cylinder 23, ensuring the stability of the energy storage device.

[0076] The principle of this technical solution is: fix the bracket 26 to the front end opening of the first cylinder 23, and fix the buffer 300 to the bracket 26 to prevent the outer wall of the buffer 300 from directly sealing with the inner wall of the first cylinder 23. Then, a third air passage 261 connected to the first chamber 2 is opened on the bracket 26, so that the first chamber 2 is always connected to the outside atmosphere. Through the setting of the bracket 26, it is not only convenient to install the buffer 300, and use the buffer 300 to limit the extreme position of the piston 21, but also to prevent the gas in the first chamber 2 from flowing back into the first cylinder 23 due to the high-pressure impact of the piston 21.

[0077] In order to increase the communication area between the first chamber 2 and the outside atmosphere, the number of the third air passages 261 can be several, and the several third air passages 261 are arranged on the bracket 26 at intervals along the circumference of the bracket 26. In this embodiment, the number of the third air passages 261 is two, and the two third air passages 261 are symmetrically arranged on the bracket 26. In other embodiments, the number of the third air passages 261 can also be any number such as three, four, five, six, etc., which can be specifically designed according to needs and the size of the bracket 26, and is not limited here.

[0078] The piston 21 includes a guide portion and a protrusion protruding from the guide portion. The guide portion and the protrusion have the same structure as the guide portion and the protrusion in the above technical solution, and will not be described in detail here. The side wall of the guide portion is provided with a plurality of receiving grooves arranged along its axial direction, some of which are used to receive the seal 25, and some of which are used to receive the sliding ring, wherein the seal 25 can be deformed by the inner wall of the first cylinder 23 and the bottom wall of the receiving groove to ensure the sealing between the first cylinder 23 and the side wall of the guide portion. The sliding ring is used to enable the guide portion to slide relative to the first cylinder 23.

[0079] Fig. 9 A cross-sectional view of an energy storage device and a striking assembly of a fastener driver provided in yet another embodiment is shown. Fig.10 Shows Fig. 9 The schematic diagram of the structure of the energy storage device and the striking component. Figures 9 and 10 As shown, the fastener driver further includes a buffer 300, which is arranged to contact the striking assembly to stop the striking assembly at the bottom dead center position. The energy storage device includes a first cylinder 33 and a second cylinder 34, at least a portion of the first cylinder 33 is accommodated in the second cylinder 34, and a portion of the outer wall of the first cylinder 33 is sealed with the inner wall of the second cylinder 34, and the air pressure in the energy storage device can stably stop the striking assembly at the top dead center position.

[0080] The striking assembly includes a piston 31 and a striker 32. At least a portion of the piston 31 is sealed and slidably matched with the inner wall of the first cylinder 33, and the piston 31 can move in the first cylinder 33 in the front-to-back direction. The front end of the piston 31 is connected to the striker 32. The buffer 300 has a through hole 301 for the striker 32 to pass through. One end of the striker 32 passing through the through hole 301 cooperates with a transmission mechanism, and the transmission mechanism can enable the striker 32 to push the piston 31 from the bottom dead center position to the top dead center position, so that the energy storage device can store energy. The energy storage device is used to move the piston 31 from the top dead center position to the bottom dead center position, so as to provide a striking force for the piston 31 and the striker 32 to move forward.

[0081] The striking assembly, transmission mechanism and energy storage device provided by this technical solution are similar in structure and working principle to those provided by the above technical solution, and will not be described in detail here. In addition, the way the first chamber 3 provided by this technical solution is connected to the outside atmosphere is also the same as the way the first chamber 3 provided by the above technical solution is connected to the outside atmosphere. The main difference between the fastener driver provided by this technical solution and the fastener driver provided by the above technical solution is that:

[0082] Continue as Figures 9 and 10As shown, the fastener driver further includes a bracket 36, the outer wall of the bracket 36 cooperates with the inner wall of the first cylinder 33 to form a fourth air passage 360 ​​connecting the first chamber 3 and the outside atmosphere. The buffer 300 is mounted on the bracket 36, and when the piston 31 contacts the buffer 300, the gas in the first chamber 3 can be discharged to the outside atmosphere through the fourth air passage 360. In other words, the difference between the fourth air passage 360 ​​and the third air passage is that the fourth air passage 360 ​​is formed by the outer wall of the bracket 36 and the inner wall of the first cylinder 33, and the third air passage is directly arranged on the bracket 36.

[0083] In this embodiment, a recess 361 is provided on the outer wall of the bracket 36, and the inner wall of the recess 361 cooperates with the inner wall of the first cylinder 33 to form a fourth air passage 360. In order to facilitate the positioning and installation of the bracket 36, the inner wall of the first cylinder 33 has a first step surface, and the outer wall of the bracket 36 is in the shape of a stepped shaft, and the step surface of the bracket 36 can abut against the first step surface. At this time, the recess 361 is adaptively provided on the outer wall of the bracket 36, that is, the recess 361 is also provided in a stepped shape.

[0084] The fastener driver further includes a stop ring 37, which is detachably mounted on the rear end surface of the bracket 36. The inner wall of the first cylinder 33 has a first step surface, and when the bracket 36 is mounted on the first cylinder 33, the stop ring 37 is located between the rear end surface of the bracket 36 and the second step surface. The stop ring 37 includes a main body 371 and a connecting portion 372, and the outer diameter of the main body 371 is larger than the outer diameter of the connecting portion, that is, the outer wall of the main body 371 protrudes from the outer wall of the connecting portion 372, so that the stop ring 37 forms a first connecting groove 3721 connecting the first chamber 3 and the fourth air channel 360 at the outer wall of the connecting portion 372. In addition, the end surface of the main body 371 close to the piston 31 in the axial direction protrudes from the end surface of the connecting portion 372 close to the piston 31 in the axial direction, so that a second connecting groove 3722 connecting the first chamber 3 and the first connecting groove 3721 is formed at the rear end surface of the connecting portion 372. In other words, the thickness T1 of the main body 371 in the axial direction of the limiting ring 37 is greater than the thickness T2 of the connecting portion 372 in the axial direction of the limiting ring 37. With such a configuration, the limiting ring 37 can not only limit the installation of the bracket 36, but also prevent the connecting portion 372 between the first chamber 3 and the fourth air channel 360 from being blocked when the buffer 300 is deformed, that is, the first chamber 3 and the fourth air channel 360 can always be connected through the first connecting groove 3721 and the second connecting groove 3722.

[0085] In this embodiment, the stop ring 37 is detachably mounted on the bracket 36 by snapping. The stop ring 37 is made of plastic, which is not only low in cost, but also can reduce the overall weight of the fastener driver and improve the user's feel. Of course, in other embodiments, the stop ring 37 can be fixedly connected to the bracket 36, or can be integrally formed with the bracket 36.

[0086] also, Figures 3 to 10 What is shown are only limited examples based on the technical concept of the present application. Cross-combining multiple embodiments can naturally derive other solutions. To clarify the relevant content, for example, one technical solution can be combined with another technical solution. In some embodiments, the fastener driver includes a buffer 300 and a bracket, a second air channel is provided on the piston, and a third air channel is provided on the bracket. At this time, the third air channel can be directly defined by the hole on the bracket, or it can be formed by the outer wall of the bracket and the inner wall of the first cylinder (for details, see the setting method of the fourth air channel 360 of the bracket 36). In some embodiments, the fastener driver includes a buffer 300, a bracket and a limit ring, a second air channel is provided on the piston, and a fourth air channel is provided on the bracket. At this time, the fourth air channel is formed by the outer wall of the bracket and the inner wall of the first cylinder, or it can be directly defined by the hole on the bracket. The way the first chamber is connected to the outside atmosphere can be determined according to the actual scene requirements, and no examples are given here one by one.

[0087] Of course, in other embodiments, the buffer 300 can also be made of porous materials, and the gas in the first chamber can flow into the through hole 301 through the pores in the buffer 300, and then be discharged into the outside atmosphere from the through hole 301. This solution can also solve or alleviate the problem of the increase in air pressure in the first cylinder as the number of nails increases.

[0088] The above implementation modes are only to illustrate the basic principles and characteristics of the present application. The present application is not limited by the above implementation modes. Without departing from the spirit and scope of the present application, the present application may be subject to various changes and modifications, which are within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A fastener driver, include: a striking assembly, including a piston; An energy storage device, configured to drive the striking assembly to move to a bottom dead center position to output striking force, the energy storage device comprising a first cylinder accommodating at least a portion of the piston; A buffer member, configured to contact the striking assembly to stop the striking assembly at the bottom dead center position; It is characterized in that The buffer has a first air passage, and when the striking assembly moves to the bottom dead center position, the gas in the first chamber defined by the piston, the buffer and the first cylinder is communicated with the atmosphere at least through the first air passage.

2. The fastener driver according to claim 1, It is characterized in that The piston has a second air passage, and the second air passage communicates with the first chamber and the first air passage.

3. The fastener driver according to claim 2, It is characterized in that The second air passage includes an inlet and an outlet. The inlet is located on the side wall of the piston and communicates with the first chamber. The outlet is located on the end wall of the piston and communicates with the first air passage.

4. The fastener driver according to claim 2, It is characterized in that The number of the second air passages is plural, and the plural second air passages are arranged at intervals along the circumference of the piston.

5. The fastener driver according to claim 3, It is characterized in that The diameter of the inlet is greater than or equal to 2 mm.

6. The fastener driver of claim 1, It is characterized in that The striking assembly also includes a striker, and the buffer member is provided with a through hole for the striker to pass through. One end of the striker passes through the through hole and is installed on the piston, and the through hole forms the first air passage.

7. The fastener driver of claim 1, It is characterized in that The piston includes a guide portion and a protrusion protruding from the end surface of the guide portion, the guide portion slidingly cooperates with the inner wall of the first cylinder, and when the piston is at the bottom dead center position, the end surface of the guide portion contacts the buffer member, and the protrusion extends into the first air passage.

8. The fastener driver of claim 1, It is characterized in that The diameter of the buffer is greater than or equal to 47 mm and less than or equal to 57 mm.

9. The fastener driver of claim 2, It is characterized in that When the gas pressure in the first chamber is greater than the atmospheric pressure, at least a portion of the gas in the first chamber flows sequentially through the second gas channel and the first gas channel into the atmosphere.

10. The fastener driver according to any one of claims 1 to 9, It is characterized in that The energy storage device further includes a second cylinder, wherein at least a portion of the first cylinder is accommodated in the second cylinder, and a portion of the outer wall of the first cylinder is sealed and matched with the inner wall of the second cylinder.

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