Fastener driver

Abstract

The utility model discloses a fastener driver, and particularly relates to an electric nailing gun. The launching mechanism and the jacking mechanism are designed to be guided by two groups of parallel guide structures, so that the force transmission between the launching mechanism and the jacking mechanism can be improved, and the vibration of the nailing gun is reduced. And the launching mechanism reciprocates between the first energy storage position and the second striking position through the interaction of the biasing mechanism and the jacking device assembly, so that the fixing piece in the nail box is driven into an object needing to be fixed. The jacking device component transmits the torsion of the output mechanism to the launching mechanism through cooperation between the protruding shaft and the protruding part. The protruding shaft is designed to be cylindrical, and the protruding part is designed to be convex arc-shaped, so that contact between the protruding shaft and the protruding part is always arc-cylindrical contact, friction force between the protruding shaft and the protruding part can be reduced, and transmission efficiency is improved.

Description

Technical Field

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

[0002] The nail gun uses the energy released instantly to push the firing pin to do hammering motion, and ejects the fasteners in the nail magazine from the gun mouth at high speed to fix the object. The nail gun usually includes an energy storage mechanism, a striking component and a lifting mechanism. The lifting mechanism and the energy storage mechanism drive the striking component to reciprocate, compressing the medium in the energy storage cylinder to obtain the instantaneous release of striking energy. Nail guns are widely used in the decoration industry. According to different energy systems, nail guns can be divided into electric nail guns, pneumatic nail guns, manual nail guns, etc. At present, electric nail guns use a variety of driving methods.

[0003] There are various types of lifting mechanisms, such as gear rack lifting, gear cam lifting, lead screw nut lifting, etc. However, these designs have problems such as low transmission efficiency, unreliable transmission and unreasonable product size. In view of the above problems, it is necessary to improve the nail gun. Summary of the invention

[0004] In one aspect, the present invention provides a fastener driver comprising: a housing defining a head portion and a handle portion; a drive mechanism positioned within the housing; and a firing mechanism comprising: a piston, a driver striker attached to the piston, and a biasing mechanism having a first end supported within the piston and a second end supported by the head portion, configured to move the piston and the driver striker from a first position toward a second position; a lifter assembly operated by the drive mechanism to move the piston and the driver striker from the second position toward the first position against a biasing force of the biasing mechanism; and a first guide member movably supporting the piston, and a second guide member movably supporting a bracket connected to and moving with the piston, the second guide member being located between the first guide member and the lifter and disposed parallel to the first guide member. A cylindrical protruding shaft is protruded from the bracket toward the lifter assembly, and a convex arc-shaped protrusion is protruded from the lifter toward the bracket. The protrusion and the protruding shaft cooperate with each other to transmit the torque output by the driving mechanism to the launching mechanism. The convex arc shape of the protrusion makes the force acting between the protrusion and the protruding shaft during their mutual movement the contact between the arc and the cylindrical surface. Such a transmission method will not cause drastic changes in the output torque, so that the torque output by the driving mechanism is stable, reducing the vibration of the product during use.

[0005] Furthermore, the first guide member of the fastener driver is cylindrical, and the launching mechanism is sleeved on the first guide member.

[0006] Furthermore, the second guide member of the fastener driver is a pair of "U"-shaped rigid members, the second guide member is fixedly disposed in the housing, and the bracket is located in the second guide member and slides in the second guide member.

[0007] Furthermore, a clearance portion is provided on the second guide member of the fastener driver, and the clearance portion can prevent the second guide member from interfering during the rotation of the lifter assembly.

[0008] Furthermore, the number of the protruding shafts and the protruding parts of the fastener driver is at least 2 pairs and they are arranged in pairs, preferably 3 pairs, so that the launching mechanism can obtain a greater impact force.

[0009] Further, a line connecting the centers of the multiple protruding shafts of the fastener driver and the first guide member are arranged in parallel.

[0010] Further, the height of the protruding shaft of the fastener driver protruding from the bracket increases sequentially from the second position to the first position, and the protruding height of the protruding part that matches the protruding shaft decreases sequentially accordingly.

[0011] Furthermore, the bracket of the fastener driver is roughly in an "L" shape of 90°, the protruding shaft is integrally arranged on the bracket, and the bracket is also provided with a through hole, through which the first guide member passes; or the bracket is integrally bent and formed by a metal plate, and the protruding shaft is integrated with the bracket by welding, riveting or interference fit.

[0012] Furthermore, the lifter assembly of the fastener driver includes an output shaft, an output bracket and a protrusion; one end of the output shaft is connected to the driving mechanism, and the other end is connected to the output bracket, and the protrusion is arranged on the protruding bracket and extends in a direction away from the driving mechanism.

[0013] Furthermore, the protrusion of the fastener driver and the output bracket are integrally formed, or the protrusion and the output bracket are integrally formed by welding, riveting or interference fitting.

[0014] Furthermore, a rotatable collar is sleeved on the outer surface of the protruding shaft of the fastener driver, and the protruding portion interacts with the collar to transmit the output torque of the driving mechanism to the launching mechanism.

[0015] The beneficial effects of the present invention are:

[0016] 1. A second guide member is set up in parallel at a distance from the first guide mechanism, and the second guide member is fixed on the housing, so that the nail gun can move smoothly during the transmission process and reduce the vibration of the machine;

[0017] 2. The contact surface between the protrusion and the protruding shaft in the jacking assembly is designed to be a convex arc, so that there will be no sudden change in the force when the protruding shaft and the protruding shaft cooperate to transmit torque, thereby ensuring smooth torque transmission, improving the efficiency of torque transmission, and reducing the friction between the two.

[0018] 3. Furthermore, a rotatable ring is set on the protruding shaft to convert the sliding friction + rotational friction between the protruding part and the protruding shaft into rotational friction. Under the condition of transmitting the same torque, the rotational friction is definitely much smaller than the sliding friction. Such a design can greatly improve the efficiency of torque transmission.

[0019] 4. The bracket is arranged in the second guide member to increase the service life of the product.

[0020] 5. In order to obtain a greater striking force, the bracket needs to be pushed further, that is, when the bias force is a compression spring, the farther the distance between the first position and the second position is, the shorter the spring is compressed, and the greater the striking force can be obtained. During the rotation of the jack assembly, the farther the distance between the output shaft and the protrusion is, the farther the bracket can be pushed to the first position. However, the greater the distance between the output shaft and the protrusion bracket, the larger the required rotation space, and the corresponding shell thickness must be increased. By designing the part where the second guide member and the protrusion interfere with each other, the bracket can be pushed as far as possible without increasing the thickness of the shell. In order to ensure the strength of the second guide member, the position where the second guide member and the protrusion interfere is set at the position where the bracket is just started to be pushed. At this time, the bias force to be overcome is relatively small, and the corresponding output torque is also small. From a structural point of view, the first protrusion is designed to protrude the longest, and the first protrusion shaft matched with it is the shortest. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic perspective view of a fastener driver.

[0022] Figure 2 yes Figure 1 A schematic three-dimensional structural diagram of a launching mechanism and a lifting device assembly of a fastener driver, wherein the launching mechanism is in a second position.

[0023] Figure 3 yes Figure 1 A schematic three-dimensional structural diagram of a launching mechanism and a lifting device assembly of a fastener driver, wherein the launching mechanism is in a first position.

[0024] Figure 4 yes Figure 1 A three-dimensional structural schematic diagram of a launching mechanism and a lifting device assembly of a fastener driver, with the launching mechanism in a second position, showing another schematic structural diagram of a guiding member.

[0025] Figure 5 yes Figure 4 Another schematic diagram of the guide member structure is shown in the figure, which is a three-dimensional diagram of the launching mechanism in the first position.

[0026] Figure 6 yes Figure 1 A schematic structural diagram of a launching mechanism and a lifting device assembly of a fastener driver, wherein the launching mechanism is in a second position.

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the bracket

[0028] Figure 8 yes Figure 7 Another three-dimensional structural schematic diagram of the bracket.

[0029] Fig. 9 It is a three-dimensional structural schematic diagram of the jacking device assembly.

[0030] Fig.10 It is a perspective schematic diagram showing the first protrusion of the lifter assembly beginning to contact the first protruding shaft.

[0031] Fig.11 It is a perspective schematic diagram showing that the first protrusion of the lifter assembly and the first protruding shaft are in an intermediate contact state.

[0032] Fig.12 It is a perspective schematic diagram of the farthest end in which the first protrusion of the lifter assembly is in contact with the first protruding shaft.

[0033] Fig.13 It is a perspective schematic diagram showing that the first protrusion of the lifter assembly is ready to separate from the first protruding shaft, and the second protrusion and the second protruding shaft begin to contact.

[0034] Fig.14 It is a perspective schematic diagram showing that the second protrusion of the lifter assembly and the second protruding shaft are in an intermediate contact state.

[0035] Fig.15 It is a perspective schematic diagram of the farthest end in which the second protrusion of the lifter assembly is in contact with the second protruding shaft.

[0036] Fig.16 It is a perspective schematic diagram showing that the second protrusion of the lifter assembly is ready to separate from the second protruding shaft, and the third protrusion and the third protruding shaft begin to contact.

[0037] Fig.17 It is a perspective schematic diagram showing that the third protrusion of the lifter assembly is in intermediate contact with the third protruding shaft.

[0038] Fig.18 It is a perspective schematic diagram showing the third protrusion of the lifter assembly being in the farthest contact with the third protruding shaft.

[0039] Reference numerals in the figures:

[0040] 10-fastener driver, 14-magazine, 12-fastener, 18-front end, 20-tenon, 22-housing, 24-parting line, 26-head portion, 30-handle portion, 34-battery receiving seat portion, 38-battery pack, 42-trigger, 46-driving mechanism, 50-electric motor, 54-gear box, 56-output shaft, 58-lifter assembly, 62-firing mechanism, 66-piston, 68-biasing member, 70, 72-compression spring, 74-driver firing pin, 73- First position, 75-second position, 80-first guide member, 82-second guide member, 86-bracket, 90-axis, 96-circular rotating ring, 98-first protruding axis, 102-second protruding axis, 103-third protruding axis, 104-first protrusion, 108-second protrusion, 109-third protrusion, 112-frame, 114-end cover, 115-seat, 116-through hole, 130-long straight line surface, 131-short straight line surface, 132-long concave arc surface, 133-short concave arc surface DETAILED DESCRIPTION

[0041] Figure 1 A fastener driver 10 (e.g., a nail gun) is shown for driving fasteners 12 (e.g., nails) held in a magazine 14 into a workpiece. The driver 10 includes a front end 18 that sequentially receives fasteners from the magazine 14 prior to each fastener driving operation. The front end 18 includes a contact 20 that allows the driver 10 to operate in a single-shot mode. In some embodiments of the driver 10, the contact latch 20 can allow operation in a single-shot mode and / or a burst or continuous mode. The driver 10 includes a housing 22 that defines a head portion 26, a handle portion 30, and a battery receptacle portion 34 that receives a battery pack 38. In the illustrated embodiment, the housing 22 is longitudinally divided into a first housing portion and a second housing portion at a parting line 24.

[0042] refer to Figure 2 , the fastener driver 10 includes a trigger 42 that selectively provides power to a drive mechanism 46 enclosed within the handle portion 30 of the driver 10. The drive mechanism 46 includes an electric motor 50, a gear box 54, and an output shaft 56 that receives torque from the motor 50 and is driven by the gear box 54.

[0043] The fastener driver 10 includes a firing mechanism 62 within the head portion 26 of the housing 22. The firing mechanism 62 is coupled to the drive mechanism 46 and is operable to perform a fastener driving operation. The firing mechanism 62 includes a movable member (e.g., a piston 66) for reciprocating within the head portion 26, a biasing member 68 (e.g., one or more compression springs 70, 72) against the piston 66 in a second position, and a driver striker 74 attached to the piston 66. The biasing member 68 urges the piston 66 and the driver striker 74 toward a bottom second position 75 within the head portion 26 to drive the fastener into the workpiece. In the illustrated embodiment, the biasing member 68 includes a pair of nested compression springs 70, 72 that act in concert to urge the piston 66 and the driver striker 74 toward the second position 75.

[0044] like Figure 2 , Figure 3 As shown, the lifter assembly 58 is positioned between the drive mechanism 46 and the firing mechanism 62 and is operated by the drive mechanism 46 to move the piston 66 and the driver striker 74 toward the top first position 73 against the bias of the biasing member 68. During the driving sequence, the biasing member 68 of the firing mechanism 62 pushes the driver striker 74 and the piston 66 from the first position 73 toward the second position 75 to fire the fastener into the workpiece. The lifter assembly 58 driven by the drive mechanism 46 is operable to move the piston 66 and the driver striker 74 from the second position 75 toward the first position 73.

[0045] Reference now Figure 3 The driver 10 further includes a first guide member 80 that slidably supports the piston 66 and a second guide member 82 that is spaced apart from the first guide member 80, and the second guide member 82 slidably supports a bracket 86 that is coupled to and moves with the piston 66. The second guide member 82 is positioned between the first guide member 80 and the lifter assembly 58, and is configured to slidably support the bracket 86. Since the piston 66 and the bracket 86 are integrally formed as a single part in the illustrated embodiment, the first guide member 80 and the second guide member 82 can both slidably support the piston 66. In the illustrated embodiment, the first guide member 80 is cylindrical, and the second guide member 82 is a "U"-shaped rigid member that is respectively provided on the left and right housings. The piston 66 can freely move along the first guide member 80 and the second guide member 82 in response to the rotation of the lifter assembly 58.

[0046] Reference now Figure 7 , showing the piston 66 in detail. The piston 66 defines: a first hole 116 sized to receive and support the first guide member 80 along the axis 90 of the first guide member 80; upper and lower guide edges of the bracket 86 cooperate with the second guide member 82 to achieve smooth operation of the jack assembly 58.

[0047] Reference now Figure 8 , the bracket 86 includes a first protruding shaft 98, which is perpendicular to the bracket 86 and is disposed away from the first guide member. A second protruding shaft 102 and a third protruding shaft 103 are parallel to the first protruding shaft 98 and are spaced apart. The first protruding shaft 98, the second protruding shaft 102, and the third protruding shaft 103 all extend toward the lifter assembly 58. In the illustrated embodiment, the first protruding shaft 98 extends farther from the bracket 86 (e.g., toward the lifter assembly 58) than the second protruding shaft 102; and the second protruding shaft 102 extends farther from the bracket 86 (e.g., the lifter assembly 58) than the third protruding shaft 103. In other words, the first protruding shaft 98 is longer than the second protruding shaft 102, and the second protruding shaft 102 is longer than the third protruding shaft 103. The lifter assembly 58 includes a first protrusion 104, a second protrusion 108, and a third protrusion 109, which are selectively engaged with a corresponding one of the first protrusion shaft 98, the second protrusion shaft 102, and the third protrusion shaft 103 formed on the bracket 86 of the piston 66 to transmit the torque output by the output shaft 56 to the launching mechanism 66.

[0048] In the illustrated embodiment, the second protrusion 108 extends further from the lifter assembly 58 (e.g., toward the bracket 86) than the first protrusion 104, so that the second protrusion 108 is sized to cooperate with the second protrusion axis. The third protrusion 109 extends further from the lifter assembly 58 (e.g., toward the bracket 86), so that the third protrusion 109 is sized to cooperate with the third protrusion axis 103. In other words, the second protrusion 108 protrudes longer than the first protrusion 104, and the third protrusion protrudes longer than the second protrusion. The configuration of the lifter assembly 58 and the bracket 86 allows the piston 66 and the driver striker 74 to be displaced from the second position 75 toward the first position 73 during a single fastener driving cycle. Because the second guide member 82 is positioned near and adjacent to the lifter assembly 58, when the lifter assembly 58 moves the piston 66 toward the first position 73, the amount of physical deflection of the bracket 86 and thus the bending stress experienced by the bracket 86 is reduced. During the entire movement process, the bracket 86 is always reliably located in the second guide member 82. Specifically, as Figure 3 , Figure 4 As shown, the second guide member 82 is configured into two "U" shapes and is reliably connected to the upper and lower shells.

[0049] refer to Fig. 9The lifter assembly 58 includes a roughly square shape surrounded by a long straight surface 130, a short straight surface 131, a long concave arc surface 132 and a short concave arc surface 133. The first protrusion 104 is located at the vertex where the long straight surface 130 and the short straight surface 131 intersect, the second protrusion 108 is located at the vertex where the long concave arc surface 132 and the short concave arc surface 133 intersect, and the third protrusion 109 is located at the vertex where the long straight surface 130 and the long concave arc surface 132 intersect. The first protrusion 104, the second protrusion 108 and the third protrusion 109 are all surrounded by multiple arcs. The arrangement of these shapes ensures that the friction between the two is minimized during the contact process with the protruding shaft (described in detail below). In order to further reduce the friction between the protrusion and the protruding shaft, a circular rotating ring 96 that can rotate on the protruding shaft can be sleeved on the outside of the protruding shaft, so that the sliding friction + rolling friction between the protrusion and the protruding shaft are all converted into rolling friction. As we all know, when the forces are similar, rolling friction is much smaller than sliding friction.

[0050] Continue to see Figure 10-12 , schematically illustrating the movement relationship between the first protruding shaft 98 and the first protrusion 104.

[0051] like Fig.10 As shown (also refer to Figure 3 ), the bracket 86 and the piston 66 are in the initial second position 75, and as the jacking assembly 58 rotates counterclockwise under the power output of the output shaft 56. First, the first protrusion 104 on the jacking assembly 58 contacts the first protruding shaft 98. As the jacking assembly 58 continues to rotate, the first protrusion 104 drives the bracket 86 to move from the second position 75 to the first position 73 against the biasing member 68 through the first protruding shaft 98. See FIG. Fig.11 As the lift assembly 58 continues to rotate, the first protrusion 104 pushes the bracket 86 to continue to move away from the second position 75 toward the first position 73. Fig.12 As the lifter assembly 58 continues to rotate, when the lifter assembly 58 rotates to a certain angle, the contact between the first protrusion 104 and the first protruding shaft 98 reaches the farthest end, and then the first protrusion 104 and the first protruding shaft 98 will begin to separate.

[0052] During the entire process of the first protrusion 104 and the first protruding shaft 98 moving from contact to separation, in order to ensure the smooth operation of the bracket 86, the torque output by the first protrusion 104 to the first protruding shaft 98 needs to change evenly, and at the same time, the thrust output by the first protrusion 104 needs to be converted as much as possible into overcoming the biasing force of the biasing member 68, that is, to improve the output efficiency. The friction between the first protrusion 104 and the first protruding shaft 98 should also be as small as possible. In order to achieve the above two points, the present invention designs the first protruding shaft 98 to be cylindrical, designs the contact surface between the first protrusion 104 and the first protruding shaft 98 to be convex arc-shaped, and ensures that the contact point between the first protrusion 104 and the first protruding shaft 98 is always the highest point between the two during the entire force transmission process (see Figure 10-12 ), that is, the contact surface between the two is always kept as the contact between the arc surface and the cylindrical surface. In order to further reduce the sliding friction between the two due to translation, a ring that can rotate concentrically around the first protruding shaft 98 is sleeved on the outside of the first protruding shaft 98 to convert the sliding friction into rolling friction.

[0053] See also Fig.13 As the lifter assembly 58 continues to rotate, the first protrusion 104 begins to prepare to disengage from the first protruding shaft 98 , while the second protrusion 108 and the second protruding shaft 102 begin to contact, further pushing the bracket 86 toward the first position 73 .

[0054] See also Fig.14 As the lifter assembly 58 continues to rotate, the first protrusion 104 is completely disengaged from the first protruding shaft 98 , and the second protrusion 108 is completely in contact with the second protruding shaft 102 , further pushing the bracket 86 toward the first position 73 .

[0055] See also Fig.15 As the lifter assembly 58 continues to rotate, the second protrusion 108 pushes the second protruding shaft 102 to the farthest end, and the two begin to prepare to separate. Figure 13-15 During the contact movement of the second protrusion 108 and the second protruding shaft 102, the contact surface of the second protrusion 108 and the second protruding shaft 102 is always at the highest point of force, and the second protruding shaft 102 is a cylindrical convex shaft. Such a shape design can also ensure that the friction between the second protrusion 108 and the second protruding shaft 102 is minimal. Furthermore, a movable ring can be set on the outside of the cylindrical protruding shaft second protruding shaft 102, so that the friction between the second protrusion 108 and the second protruding shaft 102 is rolling friction, further reducing the friction between the two. At the same time, the convex arc second protrusion 108 and the cylindrical second protruding shaft 102 are evenly stressed during the movement, ensuring the smoothness of the transmission process and reducing the vibration of the machine.

[0056] See also Fig.16As the lifter assembly 58 continues to rotate counterclockwise, the contact between the second protrusion 108 and the second protruding shaft 102 reaches the highest point and is ready to separate. At this time, the third protrusion 109 has begun to contact the third protruding shaft 103, and the third protrusion 109 will continue to push the bracket 86 to the first position 73.

[0057] See also Fig.17 As the lifter assembly 58 continues to rotate counterclockwise, the second protrusion 108 and the second protruding shaft 102 are completely separated, and the third protrusion 109 alone applies a thrust to the third protruding shaft 103 to cause the bracket 86 to continue to move toward the first position 73.

[0058] See also Fig.18 As the lifter assembly 58 continues to rotate counterclockwise, the third protrusion 109 pushes the third protruding shaft 103 to the farthest end. As mentioned above, the shape of the third protrusion 109 also minimizes the friction between the third protrusion 109 and the third protruding shaft 103. No more details are given.

[0059] When the third protrusion 109 passes the highest point of contact with the third protruding shaft 103, the third protrusion 109 suddenly disengages from the third protruding shaft 103, and the bracket 86 will move rapidly to the second position 75 under the push of the biasing force of the biasing mechanism, generating a striking force to drive the nails in the nail loop into the object to be nailed.

[0060] When the bracket 86 is in the second position 75, as the lifter assembly 58 continues to rotate, the first protrusion 104 begins to contact the first protruding shaft 98 again, and the next cycle is performed, pushing the bracket 86 from the second position 75 to the first position 73 again. This cycle repeats.

[0061] The above Figure 10-18 , fully expressing the process of moving from the second position 75 to the first position 73 and back to the second position 75, and driving the nails in the nail loop into the object. In a complete movement cycle, the first protruding shaft 98, the second protruding shaft 102 and the third protruding shaft 103 can be protruding shafts located at the same height and with the same diameter (of course, the diameters can also be different), and the first protrusion 104, the second protrusion 108 and the third protrusion 109 rotate around the output shaft of the lifter assembly 58, and change their shapes according to the distance of the contact point with the first protruding shaft 98, the second protruding shaft 102 and the third protruding shaft 103, so as to ensure that the friction between the protruding shaft and the protrusion is minimized and the force is uniform during the whole process. It ensures that the vibration amplitude of the product is minimized when it is working, the product is stable in use, the user is comfortable to operate, and the product has a long service life.

[0062] See also Figure 3 , Figure 4, the launching mechanism 62 moves from the second position 75 to the first position 73. During the movement of the launching mechanism 62, the lifting assembly 58 transmits the torque from the electric motor 50 through the gear box 54 and the output shaft 56 to the launching mechanism 62 by counterclockwise rotation. The whole movement process is as before and will not be repeated. In order to ensure that the launching mechanism 62 has enough striking force, it is necessary to overcome the biasing force of the biasing mechanism 68 as much as possible. In other words, the farther the second position 75 is from the first position 73, the greater the striking force of the launching mechanism activity. Therefore, the lifting assembly 58 hopes that the protrusion is as far away from the rotating shaft 56 as possible during the rotation process. However, the farther the protrusion is from the rotating shaft 56, the larger the required rotation space will be. The negative effect brought about is that the shell is thickened to provide the required rotation space, and the product will be enlarged, which brings inconvenience to the consumer and increases the cost of the product. Furthermore, since the torque outputted by the output shaft 56 to the bracket 86 and the biasing force of the biasing mechanism 68 to the bracket 86 are not located on the same axis, a deflection force component will be generated between the two. In order to ensure the smooth operation of the biasing mechanism 68, the deflection force component needs to be overcome by the bracket 86 during the movement. The present invention sets the bracket 86 in a friction-resistant rigid guide rail, and the rigid guide rail is reliably connected to the housing. Specifically, the second guide member 82 of the rigid guide rail is "U"-shaped and half-wraps the upper and lower guide edges of the bracket 86. Furthermore, the rigid guide rail can be connected to the housing by, for example, interference fit, injection molding as an insert and the housing, or screws.

[0063] See also Figure 10-18 In a complete movement cycle of the lifter assembly 58, in order to enable the launching mechanism 62 to obtain a greater striking force, the protrusion of the lifter assembly 58 will exceed the upper and lower guide edges of the bracket 86 during the rotation process, and the upper and lower guide edges of the bracket 86 are half-wrapped by the second guide member 82. In order to avoid interference between the protrusion and the guide groove, the following two structures are adopted to avoid it. 1. The height of the third protrusion 109 protruding from the lifter assembly 58 is ensured to be as high as possible when the third protrusion 109 and the bracket 86 are in plane contact. The guide groove corresponding to the part that protrudes from the bracket 86 during the rotation process is designed to avoid air, and the part that interferes with the second guide member 82 and the third protrusion 109 can be removed; 2. The second guide member 82 is designed to be segmented (such as Figure 4 , Figure 5 shown).

[0064] In order to ensure the strength of the second guide member 82, the interfering "U"-shaped raised edge is reduced as much as possible to ensure the integrity of the second guide member 82, until it is completely removed at some positions, leaving only a flat portion (such as Figure 3 , Figure 4 shown).

[0065] In order to ensure the strength of the second guide member 82 , the height of the second protrusion 108 is designed not to interfere with the “U”-shaped guide rail, and the height of the second protruding shaft 102 that cooperates with the second protrusion 108 is correspondingly increased.

[0066] As mentioned above, the third protrusion 109 is higher than the second protrusion 108, and the second protrusion 108 is higher than the first protrusion 104. When the first protrusion 104 does not interfere with the "U"-shaped guide rail, the first protrusion 104 will not interfere with the "U"-shaped guide rail.

[0067] Although the invention has been described in detail with reference to certain preferred embodiments, changes and modifications exist within the scope and spirit of one or more independent aspects of the invention described, and these modifications should be considered consistent with the invention as long as they do not depart from the spirit of the invention.

Claims

1. A fastener driver, characterized in that: include: a housing defining a head portion and a handle portion; A drive mechanism, wherein the drive mechanism is positioned in the housing; The launching mechanism comprises: piston; a driver striker attached to the piston, and a biasing mechanism having a first end supported within the piston and a second end supported by the head portion, the biasing mechanism being configured to move the piston and the driver striker from a first position toward a second position; a lifter assembly driven by the drive mechanism to move the piston and the driver striker from the second position to the first position against the biasing force of the biasing mechanism; Also included is a first guide member, wherein the first guide member can movably support the piston; A second guide member, wherein the second guide member can movably support the bracket, the bracket is connected to the piston and moves together, the second guide member is located between the first guide member and the jacking device, and is arranged parallel to the first guide member; The bracket is provided with a cylindrical protruding shaft protruding toward the lifter assembly, and the lifter assembly is provided with a convex arc-shaped protruding portion protruding toward the bracket, and the protruding portion and the protruding shaft cooperate with each other to transmit the torque output by the driving mechanism to the launching mechanism; The convex arc shape of the protrusion ensures that the force acting between the protrusion and the protruding shaft during their mutual movement always keeps the arc in contact with the cylindrical surface.

2. The fastener driver according to claim 1, wherein: The first guide component is cylindrical, and the launching mechanism is sleeved on the first guide component.

3. The fastener driver according to claim 1, wherein: The second guide member is a pair of "U"-shaped rigid members, the second guide member is fixedly arranged in the shell, the bracket is located in the second guide member and slides in the second guide member.

4. The fastener driver according to claim 1, wherein: The second guide member is provided with a clearance portion, and the clearance portion can prevent the second guide member from interfering with the rotation of the lifter assembly.

5. The fastener driver according to claim 1, wherein: The protruding shafts and the protruding parts are at least two pairs and are arranged in pairs.

6. The fastener driver of claim 1, wherein: The center line of the protruding shaft is arranged in parallel with the first guide member.

7. The fastener driver according to claim 5, wherein: The height of the protruding shaft protruding from the bracket increases from the second position to the first position, that is, the first protruding shaft protrudes the highest from the bracket, the second protruding shaft protrudes the second highest from the bracket, and the third protruding shaft protrudes the lowest from the bracket; The protruding heights of the protrusions that cooperate with the protruding shafts decrease accordingly, that is, the first protrusion protrudes the lowest, the second protrusion protrudes the second highest, and the third protrusion protrudes the highest.

8. The fastener driver of claim 1, wherein: The bracket is in an "L" shape of approximately 90 degrees, the protruding shaft is integrally arranged on the bracket, and a through hole is also arranged on the bracket, and the first guide member passes through the through hole.

9. The fastener driver of claim 1, wherein: The bracket is in an "L" shape of approximately 90 degrees, and is formed by bending a metal plate. The protruding shaft is integrated with the bracket by welding, riveting or interference fitting.

10. The fastener driver of claim 7, wherein: The protruding shaft is sleeved with a rotatable collar, and the protruding portion interacts with the collar to transmit the output torque of the driving mechanism to the launching mechanism.

Images