Fastener driver

Abstract

The utility model 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 power mechanism comprises a gas spring mechanism for driving the striking piece; the gas spring mechanism at least comprises a first cylinder and a second cylinder, 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 is arranged outside the first air cylinder and 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. And when the striking piece is in a shutdown state, the first piston is in a locking state, one side of the first piston is communicated with the outside, and the other side of the first piston is also communicated with the outside. By means of the arrangement, vacuum force cannot be generated between the first air cylinder and the first piston, interference generated by the vacuum force can be avoided when compressed air unlocks the first piston, and unlocking of the first piston is easier.

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 closed space with a vacuum degree between the piston and the cylinder body, 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 avoid the formation of a confined space to avoid the influence 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] a striking assembly, including a striking member configured to strike the fastener;

[0008] A power mechanism, including a gas spring mechanism for driving the striking member;

[0009] The gas spring mechanism at least comprises:

[0010] A first cylinder having a first piston built therein, wherein the striking member is fixed to one end of the first piston;

[0011] A second cylinder is arranged outside the first cylinder and is connected to one end of the first cylinder, and compressed gas capable of unlocking the first piston is formed in the second cylinder under the drive of the drive assembly;

[0012] Wherein, when the striking member is in a stopped state, the first piston is in a locked state, and one side of the first piston is connected to the outside, and the other side is also connected to the outside.

[0013] As an optional technical solution of a fastener driver, the fastener driver also includes:

[0014] a first sealing member, the first sealing member being disposed on the first piston;

[0015] a third piston, fixed to the other end of the first piston;

[0016] a second sealing member, disposed on the third piston;

[0017] Wherein, a throttle port is arranged on the first sealing member.

[0018] As an optional technical solution of a fastener driver, the throttle port includes a fracture provided on the first sealing member.

[0019] As an optional technical solution of a fastener driver, an opening extension direction of the fracture on the first sealing member is not parallel to an axial direction of the first sealing member.

[0020] As an optional technical solution of a fastener driver, the throttle port includes a groove arranged on the outer periphery of the first sealing member.

[0021] As an optional technical solution of a fastener driver, an extending direction of an opening of the groove on the first sealing member is not parallel to an axial direction of the first sealing member.

[0022] As an optional technical solution of a fastener driver, the fastener driver further includes a piston valve, which is disposed on the first piston and is configured to allow gas on one side of the first piston connected to the outside to flow to the other side of the first piston.

[0023] As an optional technical solution for a fastener driver, the piston valve is configured as a one-way throttle valve.

[0024] As an optional technical solution for a fastener driver, the piston valve is configured as a Tesla valve.

[0025] As an optional technical solution of a fastener driver, an exhaust passage is provided on the inner wall of the first cylinder, and when the first piston is in a locked state, the other side of the first piston is connected to the outside through the exhaust passage.

[0026] The beneficial effects of this application are:

[0027] The present application provides a fastener driver, in which a first cylinder and a second cylinder are connected, so that the gases therein can circulate with each other, thereby enabling the compressed gas formed in the second cylinder to unlock a first piston in the first cylinder; when the first piston is in a locked state, both sides of the first piston are connected to the outside, so that a completely sealed space cannot be formed between the first piston and the first cylinder, thereby enabling a vacuum force to be generated between the first cylinder and the first piston, and when the compressed gas unlocks the first piston, interference caused by the vacuum force can be avoided, making the unlocking of the first piston easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1This is a schematic diagram of the structure of a fastener driver in an embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the internal structure of the fastener driver in the embodiment of the present application;

[0030] Figure 3 This is a schematic cross-sectional view of the fastener driver in an embodiment of the present application;

[0031] Figure 4 It is a schematic diagram of a partial cross-sectional structure of a fastener driver in an embodiment of the present application;

[0032] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0033] Figure 6 This is a schematic structural diagram of a first perspective in which a fracture is provided on the first sealing member in an embodiment of the present application;

[0034] Figure 7 This is a second perspective structural schematic diagram of a first sealing member provided with a fracture in an embodiment of the present application;

[0035] Figure 8 This is a schematic structural diagram of a first sealing member provided with a groove from a first viewing angle in an embodiment of the present application;

[0036] Fig. 9 This is a schematic structural diagram of a groove provided on the first sealing member in a second viewing angle in an embodiment of the present application;

[0037] Fig.10 This is a schematic cross-sectional structural diagram of a first piston provided with a piston valve in an embodiment of the present application;

[0038] Fig.11 It is a schematic diagram of the cross-sectional structure of the one-way exhaust valve in the embodiment of the present application.

[0039] In the figure:

[0040] 1000, working surface;

[0041] 10. Fastener driver;

[0042] 100, housing; 101, first straight line; 102, second straight line; 110, main body; 120, motor housing; 130, handle; 131, trigger; 140, joint; 150, magazine; 160, through hole;

[0043] 200, striking component; 210, striking piece;

[0044] 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, exhaust channel; 322, second cylinder; 323, connecting piece; 330, firing assembly; 331, first piston; 3311, installation channel; 3312, piston valve; 332, second piston; 333, third piston; 334, first sealing member; 3341, fracture; 3342, first section; 3343, second section; 3344, groove; 3345, fifth straight line; 3346, sixth straight line; 335, second sealing member; 340, magnetic member; 351, one-way exhaust hole; 352, sealing pad; 353, elastic member;

[0045] 400, motor; 410, output shaft; 402, stator assembly; 403, rotor assembly; 404, motor shaft;

[0046] 500, battery pack; 510, circuit board assembly;

[0047] 600. Speed ​​reduction mechanism; 610. First speed reduction assembly. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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, etc. 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).

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0057] 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.).

[0058] like Figures 1 to 11 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.

[0059] 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).

[0060] 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.

[0061] like Figure 1 As 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.

[0062] 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, and 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 firing pin.

[0063] 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.

[0064] like Figure 3 As 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.

[0065] like Figure 2 and Figure 3As 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. The firing assembly 330 is configured to move relative to the housing 100 along the second straight line 102 and drive the striking piece 210 to move along the first straight line 101 when moving along the second straight line 102. The second straight line 102 is parallel to the first straight line 101. 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.

[0066] 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 .

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 .

[0072] 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.

[0073] 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 power mechanism 300 to drive the power mechanism 300 to move.

[0074] 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.

[0075] 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.

[0076] like Figure 3As 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 the included angle is not zero. 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 the included angle is not zero. 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.

[0077] 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.

[0078] 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.

[0079] 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 .

[0080] like Figures 2 to 3As 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 second direction. 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Combination Figure 4 and Figure 5As 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.

[0085] 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.

[0086] 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.

[0087] In this embodiment, the applicant's main purpose is to prevent the sealed space from forming a vacuum space when the first piston 331 is near the top dead center, thereby preventing the vacuum force generated by the vacuum space from interfering with the unlocking of the first piston 331.

[0088] Combination Figures 6 to 9 As shown, in some embodiments, when the striking member 210 is in a stopped state, the first piston 331 is in a locked state, and one side of the first piston 331 is in communication with the outside, and the other side is also in communication with the outside.

[0089] In the above embodiment, when the first piston 331 is in a locked state, since both sides of the first piston 331 are connected to the outside, a completely sealed space cannot be formed between the first piston 331 and the first cylinder 321, so that a vacuum force cannot be generated between the first cylinder 321 and the first piston 331. When the compressed gas unlocks the first piston 331, the interference caused by the vacuum force can be avoided, making it easier to unlock the first piston 331.

[0090] In this embodiment, a throttle is provided on the first sealing member 334. The throttle provided on the first sealing member 334 is used to connect the closed space with the external environment.

[0091] Combination Figure 6 and Figure 7 As shown, in some embodiments, the throttle port includes a break 3341 disposed on the first sealing member 334. Specifically, the first sealing member 334 is a sealing ring, and the sealing ring is broken to form the break 3341. When the first piston 331 is in a locked state, the enclosed space is connected to the outside through the break 3341, so that the enclosed space cannot form a vacuum space with vacuum force.

[0092] To reduce the effect of the break 3341 on the moving speed of the first cylinder 321 along the first straight line 101 after the first cylinder 321 is unlocked. In some embodiments, the opening extension direction of the break 3341 on the first seal 334 is not parallel to the axial direction of the first seal 334. The above arrangement increases the gas flow path in the break 3341, increases the resistance, and thus reduces the flow rate, thereby reducing the leakage of the compressed gas generated by the second cylinder 322 when pushing the first cylinder 321 to move along the first straight line 101, thereby ensuring that the first cylinder 321 moves quickly along the first straight line 101.

[0093] Further, the first seal 334 forms two sections on both sides of the fracture 3341, which are defined as a first section 3342 and a second section 3343, wherein the first section 3342 and the second section 3343 are parallel. In some embodiments, the axis of the first seal 334 is set to the fifth straight line 3345, and the angle α between the first section 3342 and the fifth straight line 3345 is 45°. In some embodiments, the angle α between the first section 3342 and the fifth straight line 3345 is 20° or 60°.

[0094] In some embodiments, the fifth straight line 3345 overlaps with the first straight line 101. In some embodiments, the fifth straight line 3345 is parallel to but not overlaps with the first straight line 101. In some embodiments, the fifth straight line 3345 intersects with the first straight line 101 and is arranged at an angle. In some embodiments, the first section 3342 and the second section 3343 are not parallel.

[0095] Combination Figure 8 and Fig. 9 As shown, regarding the structure of the throttle, in some embodiments, the throttle includes a groove 3344 disposed on the outer periphery of the first seal 334. The provision of the groove 3344 allows the first seal 334 to be a continuous structure, which helps to ensure the structural strength of the first seal 334 itself and avoid affecting its service life.

[0096] Further, the axis of the first seal 334 is set to the fifth straight line 3345, the extension direction of the opening of the groove 3344 on the first seal 334 is set to the sixth straight line 3346, and the sixth straight line 3346 is not parallel to the fifth straight line 3345. Exemplarily, the angle β between the sixth straight line 3346 and the fifth straight line 3345 is 45°. Exemplarily, the angle β between the sixth straight line 3346 and the fifth straight line 3345 is 20° or 60°. Similarly, this setting increases the flow path of the gas flowing through the groove 3344, increases the resistance, and thus reduces the flow rate, thereby reducing the leakage of the compressed gas generated by the second cylinder 322 when pushing the first cylinder 321 to move along the first straight line 101, thereby ensuring that the first cylinder 321 moves quickly along the first straight line 101.

[0097] Combination Fig.10 As shown, regarding both sides of the first piston 331 being connected to the external environment, other embodiments may also be adopted. In some embodiments, the fastener driver 10 further includes a piston valve 3312, which is disposed on the first piston 331. The piston valve 3312 is configured to allow the gas on one side of the first piston 331 connected to the outside to flow to the other side of the first piston 331. Specifically, a through installation channel 3311 is disposed on the first piston 331, and the piston valve 3312 is disposed in the installation channel 3311. The piston valve 3312 is configured as a one-way throttle valve. The one-way throttle valve allows gas to pass through the first piston 331 from the outside into the enclosed space, but when the compressed gas enters the enclosed space, the gas cannot pass through the one-way throttle valve into the external environment, so that the energy of the compressed gas can be fully used to unlock the first piston 331, and since the first piston 331 is not disturbed by the vacuum force, the unlocking of the first piston 331 is made easier.

[0098] In some embodiments, the piston valve 3312 is configured as a Tesla valve. The configuration of the Tesla valve allows the gas to smoothly enter the enclosed space when the first piston 331 is in a locked state, thereby avoiding the formation of a vacuum force in the enclosed space and preventing the vacuum force from affecting the unlocking of the first piston 331. In addition, when the first piston 331 is unlocked, when the compressed gas enters the enclosed space, it is affected by the Tesla valve, so that the process of the gas flowing out through the Tesla valve is blocked, reducing the flow rate, so that most of the compressed gas can be used to unlock the first piston 331, thereby making it easier to unlock the first piston 331.

[0099] Combination Figure 5 As shown, in order to avoid the formation of vacuum force, in some embodiments, an exhaust channel 3213 is provided on the inner wall of the first cylinder 321, and when the first piston 331 is in a locked state, the other side of the first piston 331 is connected to the outside through the exhaust channel 3213. This arrangement enables the exhaust channel 3213 to connect the two sides of the first piston 331 when the first piston 331 is in a locked state, so that gas can enter the enclosed space through the exhaust channel 3213, so that a vacuum space with vacuum force cannot be formed in the enclosed space. In this embodiment, the exhaust channel 3213 is provided in the first cylinder portion 3211.

[0100] When the compressed gas enters the enclosed space in the first cylinder 321 from the second cylinder 322, part of the gas will flow out through the exhaust channel 3213, which slightly affects the air pressure of the compressed gas. Once the first cylinder 321 is unlocked and moves forward a preset distance, the enclosed space cannot be connected to the outside world through the exhaust channel 3213. At this time, the compressed gas can be used to push the first cylinder 321 forward, which is conducive to ensuring the forward speed of the first cylinder 321. In the state where the enclosed space is connected to the outside world through the exhaust channel 3213, the first sealing member 334 is located between the front end and the rear end of the exhaust channel 3213, that is, the front end of the exhaust channel 3213 is located in front of the first sealing member 334. After the first cylinder 321 moves forward a preset distance, the first sealing member 334 passes over the front end of the exhaust channel 3213.

[0101] In order to avoid excessive leakage of compressed gas when unlocking the first cylinder 321, it is necessary to limit the flow area of ​​the exhaust channel 3213. Specifically, it is sufficient to ensure that the compressed gas can successfully unlock the first cylinder 321 after leakage. Exemplarily, during the unlocking process, the leakage of compressed gas is less than 10%, that is, the thrust generated by the compressed gas after leakage is not less than 90% of the thrust generated by the compressed gas before leakage.

[0102] like Fig.11As 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.

[0103] 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.

[0104] 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 .

[0105] The fastener driver 10 also includes a fan, which is fixedly connected to the motor shaft 404 and can rotate synchronously with the motor shaft 404. The fan is mounted to the upper end of the motor shaft 404. 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 air flow inlet and an air flow outlet are formed on the housing 100, and the air flow inlet corresponds to the position of the fan, and the air flow 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 air flow outlet also corresponds to the position of the capacitor. When the fan rotates, the heat dissipation airflow enters the housing 100 from the air flow inlet, and then flows through the circuit board assembly 510 and flows out from the air flow outlet.

[0106] 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 .

[0107] 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 .

[0108] 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); Wherein, when the striking member (210) is in a stopped state, the first piston (331) is in a locked state, and one side of the first piston (331) is in communication with the outside world, and the other side is also in communication with the outside world.

2. The fastener driver according to claim 1, characterized in that The fastener driver further comprises: a first sealing member (334), wherein the first sealing member (334) is disposed on the first piston (331); A third piston (333) is fixed to the other end of the first piston (331); A second sealing member (335) is disposed on the third piston (333); Wherein, a throttle port is arranged on the first sealing member (334).

3. The fastener driver according to claim 2, characterized in that The throttle port includes a break (3341) disposed on the first sealing member (334).

4. The fastener driver according to claim 3, characterized in that An opening extension direction of the fracture (3341) on the first sealing member (334) is not parallel to the axial direction of the first sealing member (334).

5. The fastener driver of claim 2, wherein: The throttle port includes a groove (3344) disposed on the outer periphery of the first seal (334).

6. The fastener driver of claim 5, wherein: An extension direction of an opening of the groove (3344) on the first sealing member (334) is not parallel to an axial direction of the first sealing member (334).

7. The fastener driver of claim 1, wherein: The fastener driver also includes a piston valve (3312), which is arranged on the first piston (331), and the piston valve (3312) is configured to allow gas on one side of the first piston (331) connected to the outside to flow to the other side of the first piston (331).

8. The fastener driver of claim 7, wherein: The piston valve (3312) is configured as a one-way throttle valve.

9. The fastener driver of claim 7, wherein: The piston valve (3312) is configured as a Tesla valve.

10. The fastener driver of claim 1, wherein: An exhaust passage (3213) is provided on the inner wall of the first cylinder (321), and when the first piston (331) is in a locked state, the other side of the first piston (331) is connected to the outside through the exhaust passage (3213).

Images