An electric nail gun

Abstract

This invention relates to a fastener driving tool, and more particularly to an electric nail gun, belonging to the field of tool technology. An electric nail gun includes a housing with a handle, an energy storage mechanism consisting of a cylinder and a piston housed within the housing, a nail-driving base located at the front end of the housing with a retractable striking arm forming an striking mechanism, a nail-driving mechanism consisting of a firing pin connected to the piston and extending to the nail-driving base, a lifting mechanism consisting of a motor-driven drive wheel meshing with the firing pin, a nail-feeding mechanism consisting of a nail magazine mounted on the side of the nail-driving base, and a power mechanism consisting of a motor gearbox located between the handle and the nail magazine. The nail magazine contains a safety mechanism that limits the displacement of the striking arm. Its advantages include: ensuring that the gun is not fired when there are too few fasteners in the nail magazine, thereby protecting the internal components of the tool and the surface of the workpiece; and preventing a "blank shot" phenomenon when the number of fasteners reaches a preset amount, thus effectively extending the tool's service life.

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 nails and other fasteners into workpieces to connect two or more workpieces. During operation, the trigger arm at the front of the tool must first be pressed back before the trigger can be pulled to fire the nail. To prevent accidental firing, most existing nail guns have safety mechanisms, but these only prevent accidental firing and therefore only ensure safety during storage and transportation. They cannot prevent firing when there are no fasteners in the nail magazine, which 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. Existing solutions involve using photosensitive devices to control the motor to prevent dry-firing or misfiring by electric nail guns. However, this method has drawbacks such as numerous components, complex structure, and potential for sensing errors, affecting work efficiency.

[0003] The applicant discovered through a search that US Patent No. US6966477B1 discloses a safety device to prevent a nail machine from burning out. The device has a cover plate installed on the nail magazine, and a sliding safety link on the cover plate. A drive plate is set inside the nail magazine for pushing nails, and the side of the drive plate has a rod corresponding to the locking protrusion of the cover plate. A safety member is pivotally mounted on the cover plate, with the first end of the safety member engaging with the rod of the drive plate and the second end of the safety member corresponding to the safety link on the cover plate to prevent the safety link from moving when there are no nails in the nail magazine. A spring is biased between the safety member and the cover plate. 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

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an electric nail gun that avoids firing when there are no fasteners and also avoids the "empty gun" phenomenon that easily occurs during the transition from normal nailing mode to protection mode, thereby improving work efficiency.

[0005] This invention solves the technical problem through the following technical solution: an electric nail gun, comprising a housing with a handle, an energy storage mechanism consisting of a cylinder and a piston housed within the housing, a nail-driving base located at the front end of the housing with a retractable striking arm forming an striking mechanism, a nail-driving mechanism consisting of a firing pin connected to the piston and extending to the nail-driving base, a lifting mechanism consisting of a motor-driven drive wheel meshing with the firing pin, a nail-feeding mechanism consisting of a nail magazine installed on the side of the nail-driving base, and a power mechanism consisting of a motor gearbox located between the handle and the nail magazine. The nail magazine is provided with a safety mechanism that restricts the displacement of the striking arm. The safety mechanism has a first position where it separates from the striking arm when the number of nails pushed has not reached a preset retention number, and a second position where it contacts the striking arm and restricts the displacement of the striking arm when the number of nails pushed has reached the preset retention number.

[0006] This invention limits the position of the striking arm by using a safety mechanism linked to the nail feeding mechanism, thereby preventing the nail gun from firing "empty".

[0007] The present invention further solves the technical problem through the following technical solution: the safety mechanism includes a protective block corresponding to the position of the striking arm, a pusher plate on the side away from the striking arm that is acted upon by the pusher plate spring and forms a moving pair with the nail box, and a magnet fixed to the lower end of the pusher plate facing the striking arm.

[0008] The protective block is hinged in the middle to form a lever inside the nail box, extends to the parallel of the striking arm at the upper end, and has a fork for mounting the biasing component at the lower end. The lower part of the protective block facing the nail pusher plate is a magnetic surface.

[0009] The biasing component is a reset spring or a return spring.

[0010] The security mechanism has a free position state, a locked position state, and a special position state.

[0011] When the number of nails pushed does not reach the preset retention quantity, the nail pusher plate rises under the action of the nail pusher spring and pushes the nails to the nailing seat of the impact mechanism. Under the elastic force of the biasing component, the protective block is kept in the first position where its upper end is between the impact arm and the nail pusher plate and separated from the impact arm. There is no force between the protective block and the nail pusher plate, the safety mechanism is in a free position, and the nail gun is in working condition.

[0012] When the preset number of nails is reached, the magnet on the rising nail-pushing plate does not contact the magnetic surface of the protective block. The magnet generates a magnetic force on the magnetic surface, and the protective block is blocked by the striking arm after the strike operation. The protective block does not rotate, and the nail-pushing plate's own nail-pushing movement is not hindered. It continues to rise, pushing the last nail before the safety mechanism locks to the nail-driving seat of the striking mechanism. The safety mechanism is in a special position, and the nail gun is in working condition. This completely avoids the "empty gun" phenomenon that occurs during the transition from normal nailing to the protection state.

[0013] When the number of nails pushed reaches the preset retention quantity, the magnet on the rising nail pusher plate contacts and attracts the magnetic surface of the protective block. The magnetic force is greater than the elastic force of the biasing component, and the protective block rotates to the second position at its upper end to constrain the displacement of the striking arm. Therefore, the striking arm cannot be pressed back, the safety mechanism is in the locked position, and the nail gun is in the stopped state. Even if the trigger is pulled, the fastener drive tool will not be fired to drive nails, thus preventing the occurrence of "blank shots".

[0014] This invention is ingeniously conceived, simplifying the structure, reducing the number of parts, and decreasing manufacturing difficulty. During assembly, it eliminates the need for meticulous installation of small parts such as coil springs and small compression springs, simplifying the assembly process. Its beneficial effects include: ensuring the tool will not fire when there are too few fasteners in the clip magazine, thus protecting the internal components and workpiece surface; and preventing "empty firing" when the number of fasteners reaches a preset amount, thereby effectively extending the tool's service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0016] Figure 2 for Figure 1 A schematic diagram of the internal three-dimensional structure.

[0017] Figure 3 for Figure 1 A schematic diagram of the AA cross-sectional structure of the nail gun when the safety structure is in a free position.

[0018] Figure 4 for Figure 1 A schematic diagram of the AA cross-sectional structure of a nail gun when the safety structure is in a special position.

[0019] Figure 5 for Figure 1 A schematic diagram of the AA cross-sectional structure of the nail gun when the safety structure is in the locked position.

[0020] Figure 6 for Figure 3 A partially enlarged structural diagram.

[0021] Figure 7 for Figure 4 A three-dimensional structural diagram of the striker in standby position under the current state.

[0022] Figure 8 for Figure 4 A three-dimensional structural diagram of the extreme position of the firing pin after the current state.

[0023] Figure 9 for Figure 4 A three-dimensional structural diagram of the striking pin at its extreme position before the striker reaches its final state.

[0024] In the diagram: REAR – rear limit position of the striker arm, AHEAD – front limit position of the striker arm. Detailed Implementation Example

[0025] The structure of this embodiment is as follows: Figures 1-9 As shown, an electric nail gun includes a housing 1 with a handle, an energy storage mechanism 2 consisting of a cylinder and a piston housed within the housing, a nail-driving base located at the front end of the housing with a retractable striking arm forming an impact mechanism 3, a nail-driving mechanism 4 consisting of a firing pin connected to the piston and extending to the nail-driving base, a lifting mechanism 5 consisting of a motor-driven drive wheel meshing with the firing pin, a nail-feeding mechanism 6 consisting of a nail magazine 6.1 mounted on the side of the nail-driving base, and a power mechanism 7 consisting of a motor gearbox located between the handle and the nail magazine 6.1. The nail magazine 6.1 is provided with a safety mechanism 8 that restricts the displacement of the striking arm 3.1. The safety mechanism has a first position where it separates from the striking arm 3.1 when the number of nails pushed has not reached a preset retention number, and a second position where it contacts the striking arm and restricts the displacement of the striking arm when the number of nails pushed has reached the preset retention number. The safety mechanism 8 includes a protective block 8.1 corresponding to the position of the striking arm 3.1, a pusher plate 8.3 on the side away from the striking arm 3.1, which forms a sliding pair with the nail magazine 6.1 under the action of the pusher spring 6.3, and a magnet 8.2 fixed to the lower end of the pusher plate 8.3 facing the striking arm 3.1. The pusher plate 8.3 tends to shift and rise under the action of the pusher spring 6.3, pushing the nail 9 to the nailing seat of the striking mechanism 3. The nail magazine 6.1 corresponds to the middle of the lever-shaped protective block 8.1 hinged by a pin 6.2 below the striking arm 3.1. The upper end of the protective block 8.1 extends parallel to the striking arm, and the lower part has a surface 8-1 facing the pusher plate 8.3. This surface is magnetic and can be attracted by the magnet 8.2 mounted on the pusher plate 8.3. The lower end of the protective block 8.1 has a fork 8-2 for mounting a reset spring 8-3. The biasing component can be a reset spring 8-3 or a spring. Whether the number of fasteners is less than a preset value or there are no fasteners, the safety mechanism 8 has the following characteristics: Figure 3 The free position shown (not providing protection), as... Figure 5 The locked position state shown (for protection) and as shown Figure 4 The special position status shown is (the number of fasteners has reached the preset number, and the protective block has not been magnetically moved).

[0026] During nailing operations, before the nail pusher plate 8.3 reaches the preset number of nails to be pushed, the protective block 8.1 is stabilized by the reset spring 8-3, which acts as a biasing component, at the position. Figure 3In the first position between the striking arm 3.1 and the pusher plate 8.3, there is no force between the protective block 8.1 and the pusher plate 8.3, allowing the fastener drive tool to operate normally. When the pusher plate 8.3 rises to the preset number of pusher positions, the magnet 8.2 on it begins to magnetically attract the lower surface 8-1 of the protective block 8.1. At this time, since the pusher plate 8.3's pusher movement is not obstructed, it can still push one nail 9 into place before the nail protection takes effect, avoiding a "blank shot" during the transition from normal nailing to the protection state. Subsequently, the magnetic force of the magnet 8.2 will overcome the elastic force of the reset spring 8-3, causing the protective block 8.1 to rotate to the second position where it blocks the striking arm 3.1 at the upper end. In this case, since the striking arm 3.1 cannot be pressed back, even if the trigger is pulled, the fastener drive tool cannot be fired, eliminating the "blank shot" phenomenon.

[0027] In addition to the above-described embodiments, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. An electric nail gun, comprising a housing with a handle, an energy storage mechanism consisting of a cylinder and a piston housed within the housing, a nail-driving base located at the front end of the housing with a retractable striking arm forming an impact mechanism, a nail-driving mechanism consisting of a firing pin connected to the piston and extending to the nail-driving base, a lifting mechanism consisting of a motor-driven drive wheel meshing with the firing pin, a nail-feeding mechanism consisting of a nail magazine mounted on the side of the nail-driving base, and a power mechanism consisting of a motor gearbox located between the handle and the nail magazine, characterized in that: The nail cartridge is equipped with a safety mechanism that restricts the displacement of the striking arm. The safety mechanism has a first position where it separates from the striking arm when the number of nails pushed has not reached a preset retention number, and a second position where it contacts the striking arm and restricts the displacement of the striking arm when the number of nails pushed has reached a preset retention number. The safety mechanism includes a protective block corresponding to the position of the striking arm, a nail pusher plate that forms a sliding pair with the nail cartridge on the side away from the striking arm and is acted upon by the nail pusher spring, and a magnet fixed to the lower end of the nail pusher plate facing the striking arm. The middle part of the protective block is hinged to the nail cartridge to form a lever, the upper end extends to the parallel of the striking arm, and the lower end has a fork for mounting a biasing component. The lower part of the protective block facing the nail pusher plate is a magnetic attraction surface.

2. The electric nail gun according to claim 1, characterized in that: The biasing component is a reset spring or a return spring.

3. The electric nail gun according to claim 1, characterized in that: The security mechanism has a free position state, a locked position state, and a special position state.

4. The electric nail gun according to claim 3, characterized in that: When the number of nails pushed does not reach the preset retention quantity, the nail pusher plate rises under the action of the nail pusher spring and pushes the nails to the nailing seat of the impact mechanism. Under the elastic force of the biasing component, the protective block is kept in the first position where its upper end is between the impact arm and the nail pusher plate and separated from the impact arm. There is no force between the protective block and the nail pusher plate, the safety mechanism is in a free position, and the nail gun is in working condition.

5. The electric nail gun according to claim 3, characterized in that: When the number of nails pushed reaches the preset retention quantity, the magnet on the rising nail pusher plate does not contact the magnetic surface of the protective block. The magnet generates a magnetic force on the magnetic surface, and the protective block is blocked by the striking arm after the striking operation. The protective block does not rotate, and the nail pusher plate continues to rise to push the last nail before the safety mechanism locks to the nailing seat of the striking mechanism. The safety mechanism is in a special position state, and the nail gun is in working state.

6. The electric nail gun according to claim 3, characterized in that: When the number of nails pushed reaches the preset retention quantity, the magnet on the rising nail pusher plate contacts the magnetic surface of the protective block and is attracted. The magnetic force is greater than the elastic force of the biasing component, and the protective block rotates to the second position at its upper end to constrain the displacement of the striking arm. The safety mechanism is in the locked position and the nail gun is in the stopped state.

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