Fastener driver

Abstract

The utility model relates to a fastening tool, and particularly discloses a fastener driver which comprises a striking assembly and a driving assembly, and the striking assembly comprises a striking piece arranged to strike a fastener; the driving assembly comprises a first cylinder and a second cylinder for driving the striking piece, a first piston is arranged in the first cylinder, and the striking piece is fixed at one end of the first piston; the second air cylinder communicates with one end of the first air cylinder, and compressed air capable of unlocking the first piston is formed in the second air cylinder under driving of the driving assembly. When the striking piece is in a shutdown state, one side of the first piston is communicated with the outside, the other side of the first piston forms a closed space, the closed space has an initial state and a final state, and when the closed space is in the final state, the first piston is in a locking state; the ratio of the difference value between the volume of the initial state of the closed space and the volume of the final state of the closed space to the volume of the initial state of the closed space is greater than or equal to 0 and less than or equal to 0.8. By means of the arrangement, interference generated by vacuum force when the first piston is unlocked is reduced.

Description

Technical Field

[0001] The present invention relates to a fastening tool, and more particularly to a fastener driver. Background Art

[0002] As a fastener driver, the gas spring nail gun can quickly drive nails into the work surface, providing convenience for users.

[0003] When the firing pin of the gas spring nail gun is in the stop position, the piston connected to the firing pin is attracted by magnetic force and the position is locked. However, when the firing pin is in the stop position, there is a vacuum between the piston and the cylinder, which affects the unlocking of the piston.

[0004] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0005] The purpose of the present application is to reduce the influence of vacuum on the unlocking of the piston. To this end, one purpose of the present application is to provide a fastener driver.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] Fastener drivers, including:

[0008] a striking assembly, including a striking member configured to strike the fastener;

[0009] A power mechanism, including a gas spring mechanism for driving the striking member;

[0010] The gas spring mechanism at least comprises:

[0011] A first cylinder having a first piston built therein, wherein the striking member is fixed to one end of the first piston;

[0012] A second cylinder is arranged outside the first cylinder and is connected to one end of the first cylinder. When driven by the driving assembly, compressed gas capable of unlocking the first piston is formed in the second cylinder.

[0013] When the striking member is in a stopped state, one side of the first piston is in communication with the outside, and the other side forms a closed space, and the closed space has an initial state and a final state. When the closed space is in the final state, the first piston is in a locked state;

[0014] The ratio of the difference between the volume of the enclosed space in the initial state and the volume of the enclosed space in the final state to the volume of the enclosed space in the initial state is greater than or equal to 0 and less than or equal to 0.8.

[0015] As an optional technical solution for a fastener driver, the fastener driver also includes a third piston, which is arranged at one end of the first piston. When the first piston is in the locked state, the inner wall of the first cylinder is in a closed contact position with the third piston.

[0016] As an optional technical solution of a fastener driver, the distance from the front end surface of the inner wall of the first cylinder to the rear end surface of the first piston is smaller than the distance from the closed contact position to the rear end surface of the first piston.

[0017] As an optional technical solution of a fastener driver, with the closed contact position as the vertex of the angle, the angle α between the third piston and the inner wall of the first cylinder along the striking direction is less than 90°.

[0018] As an optional technical solution for a fastener driver, the first cylinder includes a first cylinder portion and a second cylinder portion that are connected, and the inner diameter of the first cylinder portion is larger than the inner diameter of the second cylinder portion. When the first piston is in the locked state, the first piston is located in the first cylinder portion, and the third piston is located in the second cylinder portion.

[0019] As an optional technical solution for a fastener driver, the first cylinder also includes a third cylinder portion, which is connected between the first cylinder portion and the second cylinder portion. The inner diameter of the third cylinder portion gradually decreases from the first cylinder portion to the second cylinder portion. When the enclosed space is in an initial state, the enclosed contact position is located at one end of the third cylinder portion close to the second cylinder portion.

[0020] As an optional technical solution of a fastener driver, the fastener driver further includes a second seal, which is sleeved on the third piston, and the second seal is in sealing contact with the inner wall of the first cylinder at the closed contact position.

[0021] As an optional technical solution for a fastener driver, the third piston is provided with an annular groove around its own axis, and the second seal is located in the annular groove. The second seal can move in the annular groove along the axis of the third piston and stop on two opposite side walls of the annular groove.

[0022] As an optional technical solution for a fastener driver, the rear end of the first piston is recessed toward the striking direction to form a recessed space, and the recessed space is connected to the enclosed space.

[0023] As an optional technical solution for a fastener driver, a magnetic attraction member is provided on the inner wall of the first cylinder forming the enclosed space, and the magnetic force generated by the magnetic attraction member is used to attract the first piston and keep it in the locked state.

[0024] As an optional technical solution for a fastener driver, the compressed gas can overcome the magnetic force and unlock the first piston.

[0025] The beneficial effects of this application are:

[0026] The present application provides a fastener driver, which reduces the vacuum force generated in the enclosed space when the first piston is in a locked state by adjusting the ratio of the difference between the volume of the enclosed space in an initial state and the volume of the enclosed space in a final state to the volume of the enclosed space in the initial state, thereby reducing the adsorption force applied to the first piston when it is in the locked state, thereby reducing the interference caused by the vacuum force when unlocking the first piston and making it easier to unlock the first piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a fastener driver in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the internal structure of the fastener driver in the embodiment of the present application;

[0029] Figure 3 It is a schematic cross-sectional structure diagram of a fastener driver in an embodiment of the present application;

[0030] Figure 4 It is a schematic cross-sectional structure diagram of the gas spring mechanism and the firing assembly in the embodiment of the present application;

[0031] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0032] Figure 6 This is a schematic diagram of the structure of the recessed space in the embodiment of the present application;

[0033] Figure 7 It is a schematic diagram of the cross-sectional structure of the one-way exhaust valve in the embodiment of the present application.

[0034] In the figure:

[0035] 1000, working surface;

[0036] 10. Fastener driver;

[0037] 100, housing; 101, first straight line; 102, second straight line; 110, main body; 120, receiving portion; 130, handle; 131, trigger; 140, joint; 150, magazine; 160, through hole;

[0038] 200, striking component; 210, striking piece;

[0039] 300, power mechanism; 310, driving assembly; 311, crank; 312, connecting shaft; 313, driving rod; 320, gas spring mechanism; 321, first cylinder; 3211, first cylinder barrel; 3212, second cylinder barrel; 3213, third cylinder barrel; 3214, front end face; 322, second cylinder; 323, connecting piece; 330, firing assembly; 331, first piston; 3311, piston body; 3312, buffer; 3313, groove; 3314, rear end face; 332, second piston; 333, third piston; 334, first sealing piece; 335, second sealing piece; 340, magnetic attraction piece; 351, one-way exhaust hole; 352, sealing pad; 353, elastic piece;

[0040] 400, motor; 410, output shaft; 402, stator assembly; 403, rotor assembly; 404, motor shaft;

[0041] 500, battery pack; 510, circuit board assembly;

[0042] 600. Speed ​​reduction mechanism; 610. First speed reduction assembly. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 intermediary, and indirect connection refers to two parts or components being connected to at least one intermediary respectively, and the two parts or components being connected via the intermediary. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0047] 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).

[0048] 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.

[0049] 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.

[0050] In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" are interchangeable. When a unit "controller", "processor", "central processing unit", "CPU", or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0051] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0052] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0053] like Figures 1 to 7 As shown, this embodiment provides a fastener driver 10, which is used to drive a fastener into a work surface 1000. For example, the fastener is a nail, which can be a straight nail or a U-shaped nail. The fastener driver 10 drives the fastener to quickly drive into the work surface 1000, thereby fixing the work surface 1000 to the platform on the back of the work surface 1000.

[0054] Optionally, the fastener driver 10 comprises a mechanical spring-type nail gun that utilizes the force of the compressed coil spring as an impact force (e.g., driving force). Optionally, the fastener driver 10 is a cylinder-type nail gun that compresses the gas in the cylinder, and the gas pushes the firing assembly 330 out to perform the nailing impact force (e.g., driving force).

[0055] In this embodiment, the fastener driver 10 is a cylinder nail gun. Exemplarily, the gas spring mechanism 320 of the fastener driver 10 is connected to the atmosphere, and gas flows into the cylinder in a preset state.

[0056] like Figure 1As shown, the fastener driver 10 uses a rechargeable battery pack as a power source. In this embodiment, the battery pack is a battery pack 500, and the battery pack 500 cooperates with a corresponding power circuit to power the fastener driver 10. Those skilled in the art should understand that in other embodiments, the fastener driver 10 can also be powered by other power supply devices. For example, the power supply can be an AC line connected to the mains, or the power supply can also be other connecting cables that can be connected to a power supply device. The mains or other power supply devices cooperate with corresponding rectification, filtering and voltage regulation circuits to realize power supply to the corresponding components of the fastener driver 10. The battery pack 500 will be used to replace the power supply below, but it cannot be used as a limitation to the present application.

[0057] like Figures 1 to 3 As shown, the fastener driver 10 includes a housing 100, a striking assembly 200, a power mechanism 300 and a motor. The motor is a motor 400. The housing 100 is used to support the striking assembly 200, the power mechanism 300 and the motor 400. The striking assembly 200 includes a striking piece 210 for driving the fastener. Optionally, the striking piece 210 is used to drive the fastener to shoot into the working surface 1000 along the direction of the first straight line 101. The striking piece 210 is a sheet-like element extending along a plane parallel to the direction of the first straight line 101. The axis defined by the striking piece 210 itself coincides with the first straight line 101. The power mechanism 300 is used to drive the striking piece 210 to move along the direction of the first straight line 101 so as to impact the fastener to shoot into the working surface 1000 along the direction of the first straight line 101. Exemplarily, the striking piece 210 is a striker.

[0058] In order to facilitate the description of the technical solution of this application, the following definitions are made: Figure 1 The front-to-back direction and the up-to-down direction are shown, wherein the front-to-back direction is parallel to the first straight line 101, the direction from the striking member 210 to the fastener is the front, and the up-to-down direction is perpendicular to the front-to-back direction.

[0059] like Figure 2 and Figure 3As shown, in this embodiment, the motor 400 is arranged in the housing 100, and the motor 400 is used to provide power to the power mechanism 300. It is understandable that in other embodiments, the motor 400 can also be other forms of power sources, such as an engine. In this application, for the convenience of description, the motor 400 is used for description. The motor 400 is an inner rotor motor, which includes a stator assembly 402 and a rotor assembly 403, and the rotor assembly 403 includes a motor shaft 404 for outputting power, and the stator assembly 402 surrounds the motor shaft 404. The motor shaft 404 can rotate around the motor shaft 404 relative to the housing 100 to output power. It is understandable that in other embodiments, the motor 400 can also be an outer rotor motor. A battery pack 500 is detachably mounted to the housing 100. When the battery pack 500 is mounted to the housing 100, it can at least supply power to the motor 400 to enable the motor 400 to operate.

[0060] like Figure 2 and Figure 3 As shown, the power mechanism 300 includes a driving assembly 310, a gas spring mechanism 320 and a firing assembly 330. The driving assembly 310 is used to drive the gas spring mechanism 320 to store energy. The firing assembly 330 forms or connects the striking piece 210, and the firing assembly 330 is configured to be able to move relative to the housing 100 along the second straight line 102 direction and drive the striking piece 210 to move along the first straight line 101 direction when moving along the second straight line 102 direction. The gas spring mechanism 320 stores energy for driving the firing assembly 330 to move, and drives the firing assembly 330 to move when releasing energy, thereby driving the striking piece 210 to move along the first straight line 101 direction.

[0061] The fastener driver 10 further includes a magazine 150 disposed at the front end of the housing 100 . The magazine 150 is used to accommodate fasteners. The magazine 150 can push the fasteners one by one into the striking assembly 200 .

[0062] like Figure 1 As shown, the housing 100 includes a main body 110, a motor housing 120 and a handle 130. The main body 110 is formed with a first housing cavity for housing at least part of the gas spring mechanism 320. The motor housing 120 is built with a motor 400 as a driving source. The handle 130 is used for a user to hold to operate the fastener driver 10.

[0063] The fastener driver 10 further includes a trigger 131, which is mounted to the handle portion 130. The user can operate the trigger 131 to move the trigger 131 when holding the handle portion 130. The trigger 131 is used for the user to operate to start the fastener driver 10, and the trigger 131 also includes an operating surface for the user to operate. When the user's hand holds the handle portion 130, the user can contact the operating surface with the index finger to pull the trigger 131. The operating surface is the front surface of the trigger 131. In this embodiment, the operating surface is an arc-shaped surface that fits the user's finger.

[0064] The motor housing portion 120 and the handle portion 130 extend downward from the lower portion of the main body portion 110. The motor housing portion 120 is on the front side, and the handle portion 130 is on the rear side, and they extend substantially parallel to each other.

[0065] The housing 100 further includes a coupling portion 140 for coupling the battery pack 500, and the battery pack 500 can be detachably mounted to the coupling portion 140. The coupling portion 140 is arranged between the motor housing portion 120 and the end portion of the handle portion 130, and optionally, is arranged at an end of the handle portion 130 away from the main body portion 110. The battery pack 500 can be mounted to the coupling portion 140 in a direction intersecting with the direction of the second straight line 102. In some embodiments, the battery pack 500 can be mounted to the coupling portion 140 in a direction parallel to the second straight line 102.

[0066] A through hole 160 is formed between the motor housing portion 120 and the handle portion 130 for the user's hand to pass through. In the present embodiment, the main body 110 connects the handle portion 130 and the motor housing portion 120 at the upper side of the handle portion 130 and the motor housing portion 120, and the coupling portion 140 connects the handle portion 130 and the motor housing portion 120 at the lower side of the handle portion 130 and the motor housing portion 120. In this way, the main body 110, the motor housing portion 120, the coupling portion 140 and the handle portion 130 are sequentially connected to surround and form the above-mentioned through hole 160. It can be understood that in other embodiments, the coupling portion 140 may not connect the handle portion 130 and the motor housing portion 120, so that the through hole 160 is the area between the handle portion 130 and the motor housing portion 120. The through hole 160 penetrates the housing 100 in the left-right direction perpendicular to the second straight line 102. When the user holds the handle 130 , the user's fingers can be at least partially located in the through hole 160 , or the fingers can pass through the through hole 160 , so that the user's palm and fingers can surround the handle 130 to hold the handle 130 . The trigger 131 is also disposed in the through hole 160 .

[0067] The fastener driver 10 further includes a speed reduction mechanism 600 disposed between the motor 400 and the power mechanism 300, the speed reduction mechanism 600 connecting the motor 400 and the power mechanism 300, thereby transmitting the power output by the motor 400 to the power mechanism 300. The speed reduction mechanism 600 also reduces the speed output by the motor 400 for output. The speed reduction mechanism 600 is at least partially disposed in the motor housing portion 120.

[0068] In this embodiment, the speed reduction mechanism 600 is connected to the motor 400 , the speed reduction mechanism 600 is disposed in the motor housing portion 120 , and the speed reduction mechanism 600 is connected to the driving assembly 310 to drive the driving assembly 310 to move.

[0069] In this embodiment, the speed reduction mechanism 600 includes a first speed reduction assembly 610, and the first speed reduction assembly 610 uses a planetary gear for speed reduction. Because the speed reduction working principle of the planetary gear set and the speed reduction generated by this transmission mechanism have been fully disclosed to professionals in the field, a detailed description is omitted here for the purpose of brevity of the specification.

[0070] The fastener driver 10 further includes a shaft lock assembly, which (not shown) transmits power to the output shaft 410. The shaft lock assembly allows power to be transmitted from the motor 400 to the output shaft 410, while preventing power from being transmitted from the output shaft 410 to the motor 400 in the reverse direction. The structure of the shaft lock assembly is a relatively common technology and will not be described in detail herein.

[0071] like Figure 3 As shown, in this embodiment, the gas spring mechanism 320 includes at least a first cylinder 321 and a second cylinder 322. A portion or all of the first cylinder 321 is disposed in the second cylinder 322. The central axis of the first cylinder 321 is set to a third straight line. In some embodiments, the third straight line coincides with the first straight line 101. In some embodiments, the third straight line is parallel to the first straight line 101 but does not coincide with it. In some embodiments, the third straight line intersects with the first straight line 101 and is set at an angle. The central axis of the second cylinder 322 is set to a fourth straight line. In some embodiments, the fourth straight line coincides with the second straight line 102. In some embodiments, the fourth straight line is parallel to the second straight line 102 but does not coincide with it. In some embodiments, the fourth straight line intersects with the second straight line 102 and is set at an angle. A portion or all of the first cylinder 321 is disposed in the second cylinder 322. In some embodiments, the second straight line 102 is parallel to the first straight line 101.

[0072] The firing assembly 330 is disposed in the cylinder, and the firing assembly 330 includes a first piston 331 and a second piston 332. A portion or all of the first piston 331 is disposed in the first cylinder 321. The second piston 332 is disposed in the second cylinder 322. One end of the driving rod 313 is connected to the second piston 332, and can push the second piston 332 to reciprocate in the second cylinder 322 along the direction of the second straight line 102 under the rotation of the motor 400. The first piston 331 can reciprocate in the first cylinder 321 along the direction of the first straight line 101.

[0073] The striking member 210 and the first piston 331 are fixedly connected, and the first piston 331 is connected to the striking member 210 to reciprocate between the top dead center or parking position and the bottom dead center or striking position along the first straight line 101 in the first cylinder 321. The user loads nails into the magazine 150, and the first piston 331 pushes the striking member 210 to move and drive out the nails.

[0074] In some embodiments, the gas spring mechanism 320 further includes a connecting piece 323 , which is used to connect the first cylinder 321 and the second cylinder 322 , so that the gas in the second cylinder 322 can enter the first cylinder 321 through the connecting piece 323 .

[0075] like Figures 2 to 3 As shown, an embodiment of a power mechanism 300 provided by the present application. Under the drive of the driving assembly 310, compressed gas capable of unlocking the first piston 331 is formed in the second cylinder 322. Specifically, the driving assembly 310 includes a crank 311, a connecting shaft 312 and a driving rod 313. The motor 400 is connected to the output shaft 410 through a reduction assembly. The output shaft 410 drives the crank 311 to rotate. The connecting shaft 312 on the crank 311 drives the driving rod 313 to reciprocate along the second straight line 102. The driving rod 313 can push the second piston 332 to reciprocate along the direction of the second straight line 102. When the driving rod 313 pushes the second piston 332 to move from front to back in the second cylinder 322 along the direction of the second straight line 102, the gas in the second cylinder 322 enters the first cylinder 321 through the connecting piece 323. As the second piston 332 gradually approaches the connecting piece 323, the air pressure on the first piston 331 gradually increases. When the air pressure on the first piston 331 reaches a predetermined threshold, the first piston 331 is freed from the attraction of the magnetic force and / or vacuum force, and moves from back to front under the action of the air pressure, that is, from the top dead center or the stop position to the bottom dead center or the striking position, thereby pushing the striking piece 210 to move forward and hit the nail.

[0076] Regarding the structure of the first cylinder 321, in some embodiments, the first cylinder 321 includes a first cylinder portion 3211 and a second cylinder portion 3212 that are connected, and the inner diameter of the first cylinder portion 3211 is greater than the inner diameter of the second cylinder portion 3212. A third piston 333 is fixed to the other end of the first piston 331; when the first piston 331 is in a locked state, the first piston 331 is located in the first cylinder portion 3211, and the third piston 333 is located in the second cylinder portion 3212.

[0077] In this embodiment, the first piston 331 is reset to the top dead center and maintained at the top dead center position after completing a strike by magnetic attraction. In some embodiments, a magnetic attraction member 340 is provided on the inner wall of the first cylinder 321 forming a closed space. The magnetic force generated by the magnetic attraction member 340 is used to attract the first piston 331 and maintain it in a locked state at the top dead center. In this embodiment, the air pressure formed by the compressed gas generated by the second piston 332 can overcome the magnetic force to unlock the first piston 331.

[0078] Optionally, the first cylinder 321 is provided with an annular cavity on the outer side of the second cylinder portion 3212, and an annular magnetic member 340 is placed in the annular cavity. In the absence of external force, the magnetic force generated by the magnetic member 340 can keep the first piston 331 in a locked state. Optionally, the magnetic member 340 can be a magnet.

[0079] like Figure 4 and Figure 5 As shown, the first piston 331 is sleeved with a first sealing member 334 on its outer circumference, and the third piston 333 is sleeved with a second sealing member 335 on its outer circumference. When the striking member 210 is in a stopped state, the first piston 331 moves backward to the top dead center or a position near the top dead center. It should be explained that the striking member 210 in a stopped state can be understood as a state between the striking member 210 being reset after one nailing is completed and the state in which the striking member 210 is driven by air pressure to nail next time. In other words, the striking member 210 in a stopped state can be understood as a state of the striking member 210 when the motor 400 is stopped or the motor 400 does not apply a driving force to the driving assembly 310.

[0080] The first piston 331 is in sealed contact with the inner wall of the first cylinder 321 through the first seal 334. When the striking member 210 is in a stopped state, the first piston 331 is held at the top dead center by the magnetic member 340, and the second seal 335 is located at the sealed contact position of the first cylinder 321. When the second seal 335 is located in the first cylinder 321 and the seal is formed, the inner wall of the first cylinder 321, part of the outer wall of the first piston 331, part of the outer wall of the third piston 333, the first seal 334 and the second seal 335 form a sealed space, and the sealed space itself defines a volume value.

[0081] The applicant discovered during the actual product application that the volume of the gas in the sealed space is reduced due to slow leakage of the gas in the contact position between the seal and the inner wall of the cylinder or other reasons. This causes the volume value of the sealed space itself to change when the striking member 210 is in the shutdown state. The reduction in the volume value of the sealed space will cause the air pressure formed by the compressed gas generated by the second piston 332 to unlock the first piston 331, that is, when the air pressure formed by the compressed gas generated by the second piston 332 drives the first piston 331 to move forward (to the bottom dead center), it is necessary not only to overcome the magnetic force generated by the magnetic suction member 340 but also to overcome the vacuum force generated on the first piston 331 due to the reduction in the volume value of the sealed space. However, in related products, when the air pressure generated by the compressed gas produced by the second piston 332 is used to drive the first piston 331 to move, the above-mentioned vacuum force is not taken into account. Then, the existence of this vacuum force will cause the air pressure generated by the compressed gas produced by the second piston 332 to be insufficient to drive the first piston 331 to the bottom dead center position. Even when the volume value of the sealed space is reduced too much and the vacuum force is too large, the first piston 331 cannot be unlocked and driven from near the top dead center.

[0082] In this embodiment, the applicant's main purpose is to reduce the interference caused by the vacuum force generated in the sealed space when unlocking the first piston 331 .

[0083] like Figures 4 to 5 As shown, when the striking member 210 is in a stopped state, one side of the first piston 331 is connected to the outside, and the other side forms a closed space, and the closed space has an initial state and a final state. When the closed space is in the final state, the first piston 331 is in a stable locked state. In order to reduce the interference of the vacuum force when unlocking the first piston 331, the ratio of the difference between the volume of the closed space in the initial state and the volume of the closed space in the final state to the volume of the closed space in the initial state is greater than or equal to 0 and less than or equal to 0.8.

[0084] It needs to be explained that the initial state of the enclosed space is the state when the second sealing member 335 contacts the inner wall of the first cylinder 321, that is, when the enclosed space is in the initial state, the volume of the gas in the enclosed space has room to be reduced, or the initial state of the enclosed space is the state when there is basically no vacuum in the enclosed space. The final state of the enclosed space is that the first piston 331 is in a stable locked state, that is, the first piston 331 will no longer move toward the magnetic member 340 due to the reduction in volume in the enclosed space, or, a vacuum has been formed in the enclosed space and the vacuum state no longer changes. It can also be understood that the final state of the enclosed space is the state of the enclosed space when the striking member 210 is driven by the gas pressure generated by the compressed gas of the second piston 332 for the next time.

[0085] In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.7. In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.6. In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.5. In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.4. In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.3. In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.2. In some embodiments, the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is greater than or equal to 0 and less than or equal to 0.1. The difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space is the volume difference of the enclosed space. The smaller the proportion of the volume difference in the initial state of the enclosed space, the smaller the influence of the force caused by the volume difference on the driving force of the first piston 331. In some embodiments, the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space is substantially 0, so that the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space do not substantially change, and then substantially no vacuum will be generated.

[0086] According to the above discussion on the principle of vacuum force generation, the smaller the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space is, the smaller the vacuum force generated is. The smaller the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space is, the smaller the proportion of the vacuum force to the force required when the first piston 331 is unlocked is, that is, the gas pressure generated by the compressed gas of the second piston 332 needs to overcome the vacuum force. The fastener driver 10 adjusts the ratio of the difference between the volume of the initial state of the enclosed space and the volume of the final state of the enclosed space to the volume of the initial state of the enclosed space to reduce the vacuum force generated by the enclosed space when the first piston 331 is in the locked state, so that the proportion of magnetic force in the adsorption force received by the first piston 331 when it is in the locked state is increased, reducing the interference generated by the vacuum force when unlocking the first piston 331, making it easier to unlock the first piston 331.

[0087] According to the principle of vacuum formation, the vacuum force generated by the enclosed space in the final state can be changed by changing the volume of the initial state and the final state of the enclosed space. In some embodiments, the vacuum force generated by the enclosed space in the final state is reduced by reducing the volume of the enclosed space in the initial state. In some embodiments, the proportion of the vacuum force generated by the enclosed space in the final state to the driving force required when the first piston 331 is unlocked is reduced by increasing the volume of the enclosed space in the final state. In some embodiments, the interference generated by the vacuum force when unlocking the first piston 331 is reduced by reducing the volume of the enclosed space in the initial state and increasing the volume of the enclosed space in the final state.

[0088] In some embodiments, when the first piston 331 is in the locked state, the inner wall of the first cylinder 321 is in a sealed contact position with the third piston 333. Optionally, when the enclosed space is in the initial state, the first cylinder 321 is in contact with the third piston 333 at the first sealed contact position; when the enclosed space is in the final state, the first cylinder 321 is in a sealed contact position with the third piston 333.

[0089] In some embodiments, the distance from the front end surface 3214 of the inner wall of the first cylinder 321 to the rear end surface 3314 of the first piston 331 is smaller than the distance from the sealed contact position to the rear end surface 3314 of the first piston 331. The front end surface 3214 of the inner wall of the first cylinder 321 is opposite to the rear end surface 3314 of the first piston 331. Specifically, the distance from the front end surface 3214 of the inner wall of the first cylinder 321 to the rear end surface 3314 of the first piston 331 is smaller than the distance from the first sealed contact position to the rear end surface 3314 of the first piston 331. The above structure is set up so that when the third piston 333 and the inner wall of the first cylinder 321 are in sealing contact, a closed space is formed and is in an initial state. Compared with the structure in the prior art, when the closed space is formed, the third piston 333 moves to the left, and the rear end face 3314 of the first piston 331 moves to the left, so the distance L between the rear end face 3314 of the first piston 331 and the front end face 3214 of the inner wall of the first cylinder 321 is also reduced. The volume of the initial state of the closed space is reduced, so the space where the first piston 331 continues to move toward the magnetic attraction member 340 becomes smaller due to the reduction in the volume of the closed space, and the volume difference between the initial state of the closed space and the closed space in the final state is also smaller than the volume difference when the initial state of the closed space is larger. This helps to reduce the vacuum force generated when the closed space is in the final state and reduce interference with unlocking.

[0090] In some embodiments, with the closed contact position as the vertex of the angle, the angle α between the third piston 333 and the inner wall surface of the first cylinder 321 along the striking direction is less than 90°. The striking direction is parallel to the first straight line 101. Specifically, with the first closed contact position as the vertex of the angle, the angle α between the third piston 333 and the inner wall surface of the first cylinder 321 along the striking direction is less than 90°. This arrangement makes the inner wall surface of the first cylinder 321 flared along the striking direction at the first closed contact position, so that before the third piston 333 arrives at the first sealed contact position, there is a gap between the third piston 333 and the inner wall surface of the first cylinder 321, and a closed space cannot be formed, so that the first piston 331 and the third piston 333 can smoothly move backward until the third piston 333 arrives at the first sealed contact position.

[0091] In this embodiment, the first cylinder 321 also includes a third cylinder portion 3213, which is connected between the first cylinder portion 3211 and the second cylinder portion 3212. The inner diameter of the third cylinder portion 3213 gradually decreases from the first cylinder portion 3211 to the second cylinder portion 3212. When the enclosed space is in an initial state, the enclosed contact position is located at one end of the third cylinder portion 3213 close to the second cylinder portion 3212. In this embodiment, the first enclosed contact position is located on the third cylinder portion 3213. The first cylinder 321 is in a bell-mouth shape at the third cylinder portion 3213. The angle α between the generatrix of the first cylinder 321 at the third cylinder portion 3213 and the striking direction is less than 90°.

[0092] In some embodiments, the third cylinder portion 3213 may be a straight cylinder structure. The diameter of the third cylinder portion 3213 is greater than the diameter of the second cylinder portion 3212, and smaller than the diameter of the first cylinder portion 3211. In this embodiment, the first sealed contact position may be disposed at one end of the second cylinder portion 3212 close to the third cylinder portion 3213. The second sealed contact position may be located inside the second cylinder portion 3212.

[0093] In some embodiments, the third piston 333 is provided with an annular groove around its own axis direction, and the second seal 335 is located in the annular groove. The second seal 335 can move along the axis of the third piston 333 in the annular groove and stop at two opposite side walls of the annular groove. The axis of the third piston 333 is defined as the fifth straight line. In some embodiments, the fifth straight line coincides with the first straight line 101. In some embodiments, the fifth straight line is parallel to the first straight line 101 but does not coincide. In some embodiments, the fifth straight line intersects with the first straight line 101 and is arranged at an angle. The above-mentioned structure is arranged so that the closed contact position of the second seal 335 on the third piston 333 and the first cylinder 321 can remain stationary during the process of the closed space changing from the initial state to the final state, that is, the first sealed contact position and the second sealed contact position coincide. Of course, in other embodiments, when the second seal 335 and the third piston 333 are fixed, the second seal 335 on the third piston 333 can move backward during the process of the closed space changing from the initial state to the final state.

[0094] like Figure 6 As shown, in some embodiments, the rear end surface 3314 of the first piston 331 is recessed in the striking direction to form a recessed space, and the recessed space is connected to the enclosed space. In this embodiment, due to the existence of the recessed space, the volume of the enclosed space in the final state is increased, thereby reducing the ratio of the vacuum force generated in the enclosed space in the final state to the force required when the first piston 331 is unlocked, thereby improving the interference of the vacuum degree on the unlocking.

[0095] Exemplarily, a cavity is provided inside the first piston 331, and the first piston 331 is provided with a communication channel connecting the cavity and the enclosed space. Exemplarily, the cavity is annular. The annular cavity can increase the volume of the enclosed space in the final state as much as possible. In addition, the third piston 333 is partially penetrated inside the annular cavity to ensure a fixed connection with the second cylinder 322.

[0096] Regarding the structure of the first piston 331, in this embodiment, the first piston 331 includes a piston body 3311 and a buffer member 3312 fixed to the rear end of the piston body 3311, the piston body 3311 is provided with a groove 3313 opening backwards, and the buffer member 3312 and the groove 3313 form a cavity.

[0097] like Figure 7As shown, in some alternative embodiments, the first piston 331 is reset to the top dead center and maintained at the top dead center position after completing a strike by vacuum force. In this embodiment, a one-way exhaust valve is provided on the inner wall of the first cylinder 321 forming a closed space, and the one-way exhaust valve is used to exhaust the gas in the closed space to form a vacuum space with vacuum force, and the vacuum force is used to adsorb the first piston 331 and keep it in a locked state. In this embodiment, the compressed gas can overcome the vacuum force and unlock the first piston 331.

[0098] The above arrangement allows the gas in the sealed space to be discharged to the outside through the one-way exhaust valve during the process of the sealed space changing from the initial state to the final state, which is conducive to the sealed space reaching the final state, and then the first piston 331 smoothly reaches the locked state. Regarding the structure of the one-way exhaust valve, illustratively, a one-way exhaust hole 351 is provided at the end of the first cylinder portion 3211 close to the second cylinder portion 3212, and the fastener driver 10 further includes a sealing gasket 352 and an elastic member 353, and the elastic member 353 is provided between the sealing gasket 352 and the first cylinder 321, and applies an elastic force to the sealing gasket 352 so that the sealing gasket 352 seals the one-way exhaust hole 351. When the striking member 210 is in the shutdown state, during the process of the first piston 331 moving to the locked state, that is, during the process of the enclosed space changing from the initial state to the final state, the pressure in the enclosed space increases, and after overcoming the elastic force of the elastic member 353, the sealing gasket 352 moves away from and opens the one-way exhaust hole 351, so that the gas in the enclosed space is discharged through the one-way exhaust hole 351. When the first piston 331 moves to the locked state, the sealing gasket 352 is reset to the position of sealing the one-way exhaust hole 351 under the action of the elastic force. At this time, a vacuum space is formed in the sealed space.

[0099] In this embodiment, a circuit board assembly 510 is further disposed in the coupling portion 140 . The circuit board assembly 510 is electrically connected to the motor 400 to control the operation of the motor 400 .

[0100] The fastener driver 10 also includes a fan, which is fixedly connected to the motor 400 shaft and can rotate synchronously with the motor 400 shaft. The fan is mounted to the upper end of the motor 400 shaft. When the fan rotates, a heat dissipation airflow can be generated that flows into the housing 100 from the outside and then flows out of the housing 100. An airflow inlet and an airflow outlet are formed on the housing 100, and the airflow inlet corresponds to the position of the fan, and the airflow outlet corresponds to the position of the circuit board assembly 510. In the present embodiment, a high-power capacitor is provided on the circuit board assembly 510. The airflow outlet also corresponds to the position of the capacitor. When the fan rotates, the heat dissipation airflow enters the housing 100 from the airflow inlet, and then flows through the circuit board assembly 510 and flows out from the airflow outlet.

[0101] The circuit board assembly 510 is disposed in the coupling portion 140 , and the capacitor is disposed on the upper side of the circuit board assembly 510 . The lower side of the circuit board assembly 510 is provided with electrical connection terminals, which are used to form an electrical connection with the battery pack 500 so that the battery pack 500 supplies power to the motor 400 .

[0102] In some embodiments, a partition for separating the motor 400 and the circuit board assembly 510 may be further provided at the joint portion 140 , so that heat generated during the operation of the motor 400 will not enter the circuit board assembly 510 .

[0103] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A fastener driver, characterized in that include: A striking assembly (200) includes a striking member (210) configured to strike a fastener; A power mechanism (300) comprising a gas spring mechanism (320) for driving the striking member (210); The gas spring mechanism (320) comprises at least: A first cylinder (321) having a first piston (331) therein, wherein the striking member (210) is fixed to one end of the first piston (331); A second cylinder (322) is arranged outside the first cylinder (321) and is in communication with one end of the first cylinder (321). When driven by the driving assembly (310), compressed gas capable of unlocking the first piston (331) is formed in the second cylinder (322); When the striking member (210) is in a stopped state, one side of the first piston (331) is in communication with the outside, and the other side forms a closed space, and the closed space has an initial state and a final state. When the closed space is in the final state, the first piston (331) is in a locked state; The ratio of the difference between the volume of the enclosed space in the initial state and the volume of the enclosed space in the final state to the volume of the enclosed space in the initial state is greater than or equal to 0 and less than or equal to 0.

8.

2. The fastener driver according to claim 1, characterized in that The fastener driver further comprises a third piston (333), wherein the third piston (333) is arranged at one end of the first piston (331), and when the first piston (331) is in the locking state, the inner wall of the first cylinder (321) is in a sealed contact position with the third piston (333).

3. The fastener driver according to claim 2, characterized in that The distance from the front end surface (3214) of the inner wall of the first cylinder (321) to the rear end surface of the first piston (331) is smaller than the distance from the sealed contact position to the rear end surface of the first piston (331).

4. The fastener driver according to claim 2, characterized in that With the sealed contact position as the vertex of the angle, the angle α between the third piston (333) and the inner wall surface of the first cylinder (321) along the striking direction is less than 90°.

5. The fastener driver of claim 2, wherein: The first cylinder (321) includes a first cylinder portion (3211) and a second cylinder portion (3212) which are connected to each other, and the inner diameter of the first cylinder portion (3211) is larger than the inner diameter of the second cylinder portion (3212). When the first piston (331) is in the locked state, the first piston (331) is located in the first cylinder portion (3211), and the third piston (333) is located in the second cylinder portion (3212).

6. The fastener driver of claim 5, wherein: The first cylinder (321) also includes a third cylinder portion (3213), which is connected between the first cylinder portion (3211) and the second cylinder portion (3212). Along the direction from the first cylinder portion (3211) to the second cylinder portion (3212), the inner diameter of the third cylinder portion (3213) gradually decreases. When the enclosed space is in an initial state, the enclosed contact position is located at one end of the third cylinder portion (3213) close to the second cylinder portion (3212).

7. The fastener driver of claim 2, wherein: The fastener driver further comprises a second sealing member (335), wherein the second sealing member (335) is sleeved on the third piston (333), and the second sealing member (335) is in sealing contact with the inner wall of the first cylinder (321) at the sealed contact position.

8. The fastener driver of claim 7, wherein: The third piston (333) is provided with an annular groove around its own axis direction, and the second sealing member (335) is located in the annular groove. The second sealing member (335) can move in the annular groove along the axis of the third piston (333) and stop at two opposite side walls of the annular groove.

9. The fastener driver of claim 1, wherein: The rear end of the first piston (331) is recessed in the striking direction to form a recessed space, and the recessed space is connected to the enclosed space.

10. The fastener driver of claim 1, wherein: A magnetic attraction component (340) is provided on the inner wall of the first cylinder (321) forming the enclosed space. The magnetic force generated by the magnetic attraction component (340) is used to attract the first piston (331) and keep it in the locked state.

11. The fastener driver of claim 10, wherein: The compressed gas is able to overcome the magnetic force and unlock the first piston (331).

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