A fastener driving tool

Abstract

The present application relates to a kind of fastener driving tools, belong to tool technical field.The shell of the tool is placed energy storage mechanism, touch mechanism, nail driving mechanism, lifting mechanism, nail conveying mechanism;Nail magazine is equipped with push nail plate and constitutes moving pair, push nail plate is under the action of push nail spring and tends to push nail and move to nail driving seat;Nail magazine is hinged with protective block below corresponding touch arm position, the positioning end of protective block is installed elastic element, and the elastic end of elastic element extends to the movement track of push nail plate by positioning end;When push nail plate does not reach the position of pre-set reserved quantity of nail, protective block is stably positioned in the first angular position between touch arm and push nail plate under the action of biasing element;When push nail plate reaches the position of pre-set reserved quantity of nail, by acting on the elastic end of elastic element, make protective block index to the second angular position of blocking touch arm.The present application can completely avoid "empty gun" phenomenon in the process of switching from normal nailing to protection state.

Description

Technical Field

[0001] This invention relates to a fastener driving tool, and more particularly to an electric nail gun, belonging to the field of tool technology. Background Technology

[0002] Fastener-driving tools such as nail guns are typically used to drive fasteners, such as nails, into workpieces, connecting two or more workpieces. These powered fastener-driving tools utilize compressed air, electrical energy, or the elastic potential energy of elastic components as power sources. Their basic structure includes a handle, a drive energy source, a control unit, and a nail magazine. During operation, the striking arm at the front of the tool must first be pressed back before the trigger can be pulled to fire the nail. Although most existing fastener-driving tools have safety mechanisms, these typically only prevent accidental firing. Therefore, they only ensure the safety of the tool during storage and transportation, and cannot prevent firing when there are no fasteners in the nail magazine. This still poses a risk—firing without fasteners may damage the workpiece surface and affect product quality; repeated firing without fasteners may also damage internal structural components and shorten the tool's lifespan.

[0003] A search reveals that US Patent No. US6966477B1 discloses a safety device to prevent a nail machine from burning out. The device includes a cover plate mounted on the nail magazine, with a sliding safety link on the cover plate. A drive plate is located inside the nail magazine for pushing nails, and a rod on the side of the drive plate corresponds to a locking protrusion on the cover plate. A safety element is pivotally mounted on the cover plate, with its first end engaging with the rod on the drive plate and its second end corresponding to the safety link on the cover plate to prevent the safety link from moving when no nails are loaded in the nail magazine. A spring is biased between the safety element and the cover plate.

[0004] In this technical solution, the safety component rotates around the pin. Because the drive plate's rod is rigidly connected to the safety component, when the number of nails reaches the preset retention number, the impact operation during nailing causes the safety linkage to move backward. The safety linkage blocks one side of the safety component, preventing it from rotating. Meanwhile, the drive plate's rod presses against the safety component, preventing the drive plate from continuing to push the nails upward. However, after the firing pin moves backward, the drive plate needs to move upward by the distance of one nail to push the nail to the plane position at the front end of the firing pin in order to fire the nail normally. Therefore, at this time, the drive plate cannot push the nail into place, which still results in a "blank shot." That is, during the transition from normal nailing to the protection state, the phenomenon of the firing pin failing to hit the nail cannot be avoided. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a fastener driving tool that can eliminate the "dry shot" phenomenon through structural improvements, thereby avoiding damage to the workpiece surface, protecting internal parts, and creating more favorable conditions for ensuring work quality and extending service life.

[0006] To achieve the above objectives, the basic technical solution of the fastener driving tool of the present invention is as follows: it includes a housing; the housing houses an energy storage mechanism consisting of a cylinder and a piston, an impact mechanism consisting of a retractable impact arm in a nail-driving seat, a nail-driving mechanism consisting of a striker extending from the piston to the nail-driving seat, a lifting mechanism consisting of a motor-driven drive wheel meshing with the striker, and a nail-feeding mechanism consisting of a nail box installed on the side of the nail-driving seat. The nail box contains a nail pusher plate that forms a sliding pair with it. Under the action of the nail pusher spring, the nail pusher plate tends to push the nail and move to the nail-driving seat. The nail box is hinged with a protective block at the position below the striking arm. The protective block is equipped with the positioning end of the elastic element, and the elastic end of the elastic element extends from the positioning end to the movement trajectory of the nail pusher plate. Before the pusher plate reaches the preset number of pusher positions, the protective block is stabilized at the first angular position between the striking arm and the pusher plate under the action of the biasing component. When the pusher plate reaches the preset number of pusher positions, the protective block is rotated to the second angular position to block the impact arm by acting on the elastic end of the elastic element.

[0007] During nailing operations, when the number of nails in the nail magazine exceeds the preset reserve, the protective block and the pusher plate do not interact. Under the action of the biasing element, the protective block remains stable at the first angular position between the striking arm and the pusher plate. Therefore, the fastener drive tool operates normally, just like in existing technologies. When the number of nails in the nail magazine equals the preset reserve, the protective block rotates to the second angular position blocking the striking arm under the action of the pusher plate via the elastic element. As a result, the striking arm cannot be pushed back, and even if the trigger is pulled, the fastener drive tool will not be fired, thus preventing "dry firing." In particular, because the pusher plate acts on the protective block via the elastic element, its own nail-pushing movement is not obstructed, allowing the nails to continue being pushed into place, completely avoiding the "dry firing" phenomenon during the transition from normal nailing to the protective state.

[0008] Further improvements to this invention include: The nail box is located below the striking arm and is hinged to the center of a lever-shaped protective block via a pin. The elastic element is a flexible spring.

[0009] The lower part of the protective block is fitted with a flexible spring sheet and a corresponding ring positioning end in the positioning hole.

[0010] The lower end of the pusher plate bends and extends toward the striking arm to form a trigger end.

[0011] The elastic end of the flexible spring extends upward from the positioning end into the vertical movement trajectory of the trigger end of the pusher plate.

[0012] The protective block has a clearance notch at the position corresponding to the elastic end.

[0013] The lower end of the protective block has a fork for mounting a reset spring.

[0014] The stiffness of the push pin spring is greater than the stiffness of the flexible spring, and the stiffness of the flexible spring is greater than the stiffness of the reset spring.

[0015] The torque acting on the protective block is greater than the torque generated by the push pin spring, which is greater than the torque generated by the flexible spring, which is greater than the torque generated by the reset spring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the internal three-dimensional structure of the embodiment.

[0018] Figure 3 yes Figure 1 A schematic diagram of the AA cross-sectional structure in the free state of the embodiment.

[0019] Figure 4 yes Figure 1 The embodiment shows a cross-sectional view of the elastic element under compression.

[0020] Figure 5 yes Figure 1 A schematic diagram of the AA cross-sectional structure when the protective block is driven after the compression of the elastic element in the embodiment.

[0021] Figure 6 yes Figure 1 A schematic diagram of the AA cross-sectional structure in the locked state of the embodiment.

[0022] Figure 7 yes Figure 3 A partially enlarged structural diagram.

[0023] Figure 8 Figure 4 A three-dimensional structural diagram of the striker in standby position under certain conditions.

[0024] Figure 9 yes Figure 5 A three-dimensional structural diagram of the extreme position of the firing pin after the current state.

[0025] Figure 10 yes Figure 5 A three-dimensional structural diagram of the striking pin at its extreme position before the striker reaches its final state.

[0026] In the diagram: REAR – rear limit position of the striker arm, AHEAD – front limit position of the striker arm. Implementation Example

[0027] The basic structure of the fastener driving tool in this embodiment is similar to that of the prior art, such as... Figure 1 , Figure 2 As shown, the housing 1 with a handle houses an energy storage mechanism 2 consisting of a cylinder and a piston, an impact mechanism 3 consisting of a retractable impact arm consisting of a front-end nail-driving seat, a nail-driving mechanism 4 consisting of a firing pin that extends from the piston to the impact arm, a lifting mechanism 5 consisting of a drive wheel driven by a motor that meshes with the firing pin, a nail-feeding mechanism 6 consisting of a nail magazine installed on the side of the nail-driving seat, and a power mechanism 7 consisting of a motor gearbox located between the handle and the nail magazine.

[0028] In addition, the fastener driving tool in this embodiment is also installed in a safety mechanism 8 consisting of a protective block 8.1, a flexible spring 8.2, and a pusher plate 8.4 in the nail box 6.1.

[0029] like Figure 3 Combination Figure 7 As shown, the nail feed mechanism 6 has a nail pusher plate 8.4 inside the nail magazine 6.1, which forms a lifting and sliding pair with it. Under the action of the nail pusher spring 6.3, the nail pusher plate 8.4 tends to move and rise, pushing the nail 9 to the nailing seat of the striking mechanism 3. The lower end of the nail pusher plate 8.4 bends and extends towards the striking arm 3.1 to form a trigger end 8.3.

[0030] The nail box 6.1 is hinged to the middle of a lever-shaped protective block 8.1 via a pin 6.2 below the striking arm 3.1. A positioning hole at the lower part of the protective block 8.1 houses a matching loop positioning end of a flexible spring 8.2. The elastic end of the flexible spring 8.2 extends upwards from the positioning end into the lifting and lowering trajectory of the trigger end 8.3 of the pusher plate 8.4. The protective block 8.1 has a clearance notch 8-1 at the position corresponding to the elastic end, and a fork 8-2 at its lower end for mounting a reset spring 8-3. In this embodiment, the stiffness relationship of the elastic force components is: pusher spring 6.3 > flexible spring 8.2 > reset spring 8-3, and the torque acting on the protective block is: pusher spring 6.3 > flexible spring 8.2 > reset spring 8-3.

[0031] During nailing operations, before the nail pusher plate 8.4 reaches the preset number of nail pusher positions, the protective block 8.1, under the action of the reset spring 8-3 acting as a biasing component, remains stable. Figure 3 As shown, at the first angular position between the striking arm 3.1 and the pusher plate 8.4, the protective block 8.1 and the pusher plate 8.4 do not interfere with each other, thus allowing the fastener drive tool to perform normal nailing operations. When the pusher plate 8.4 rises to the preset number of nails to be pushed, its trigger end 8.3... Figure 4 (See) Figure 8As shown in the diagram, the flexible end 8.2 begins to contact the elastic end of the flexible spring in its natural state; as the pusher plate 8.4 continues to rise, its trigger end 8.3 will... Figure 5 (See) Figure 9 As shown in the diagram, the flexible spring 8.2 is initially pressed into the clearance recess 8-1. At this time, since the movement of the push pin of the push plate 8.4 is not obstructed, the nail 9 before the nailing protection takes effect can still be pushed into place, avoiding a "blank shot" during the transition from normal nailing to the protection state. Subsequently, the pressing action of the trigger end 8.3 will overcome the elastic force of the reset spring 8-3, causing the protection block 8.1 to... Figure 6 (See) Figure 10 The upper blocking arm 3.1 is rotated to the second angular position as shown in the figure; in this case, since the arm 3.1 cannot be pressed back, even if the trigger is pulled, the fastener drive tool cannot be fired, thus eliminating the occurrence of "dry firing".

[0032] The safety mechanism in this embodiment actually has the following main positional states (regardless of whether the number of fasteners is less than a preset value or there are no fasteners): 1) Free state (see Figure 3 — It did not provide any protection; 2) Locked state (see) Figure 6 —It serves a protective function; 3) One of the special states (see Figure 4 — The number of fasteners has reached the preset number, but the flexible spring is not compressed; 4) Special State Two (see Figure 5 —When the number of fasteners reaches the preset number, the protective block remains stationary, only compressing the flexible spring.

[0033] Practice has shown that this embodiment can ensure that the fastener drive tool is not fired when there are too few fasteners in the fastener magazine, thereby protecting the internal components of the tool and the surface of the workpiece. At the same time, it can avoid the "blank shot" phenomenon when the number of fasteners reaches the preset number, thereby effectively extending the service life of the tool.

[0034] In addition to the embodiments described above, the present invention may have other implementations. For example, the number of protective blocks may be one or more; the elastic component may be a spring, a sheet, or a spring; the trigger end may be integrated with the pusher plate or be an independent component connected to the pusher plate; the trigger end may first push the elastic element and then push the protective block, or it may push the elastic element and then push the protective block through a transmission component. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A fastener driving tool, comprising a housing; wherein the housing houses an energy storage mechanism consisting of a cylinder and a piston, an impact mechanism consisting of a retractable impact arm in a nail-driving seat, a nail-driving mechanism consisting of a striker extending from the piston to the nail-driving seat, a lifting mechanism consisting of a motor-driven wheel meshing with the striker, and a nail-feeding mechanism consisting of a nail magazine mounted on the side of the nail-driving seat; wherein the nail magazine contains a nail-pushing plate forming a sliding pair therewith, the nail-pushing plate moving towards the nail-driving seat under the action of a nail-pushing spring; characterized in that: The nail box is hinged with a protective block at the position below the striking arm. The protective block is equipped with the positioning end of the elastic element, and the elastic end of the elastic element extends from the positioning end to the movement trajectory of the nail pusher plate. Before the pusher plate reaches the preset number of pusher positions, the protective block is stabilized at the first angular position between the striking arm and the pusher plate under the action of the biasing component. When the pusher plate reaches the preset number of pusher positions, the protective block is rotated to the second angular position blocking the impact arm by acting on the elastic end of the elastic element; the elastic element is a flexible spring sheet; the lower end of the protective block has a fork for mounting a reset spring sheet; the stiffness of the pusher spring is greater than the stiffness of the flexible spring sheet, and the stiffness of the flexible spring sheet is greater than the stiffness of the reset spring sheet; the torque acting on the protective block is the torque generated by the pusher spring > the torque generated by the flexible spring sheet > the torque generated by the reset spring sheet.

2. The fastener driving tool according to claim 1, characterized in that: The nail box is located below the striking arm and is hinged to the center of a lever-shaped protective block via a pin.

3. The fastener driving tool according to claim 2, characterized in that: The lower part of the protective block is fitted with a flexible spring sheet and a corresponding ring positioning end in the positioning hole.

4. The fastener driving tool according to claim 3, characterized in that: The lower end of the pusher plate bends and extends toward the striking arm to form a trigger end.

5. The fastener driving tool according to claim 4, characterized in that: The elastic end of the flexible spring extends upward from the positioning end into the vertical movement trajectory of the trigger end of the pusher plate.

6. The fastener driving tool according to claim 5, characterized in that: The protective block has a clearance notch at the position corresponding to the elastic end.

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