WO2020248531A1

WO2020248531A1 - Tool for striking fastener

Info

Publication number: WO2020248531A1
Application number: PCT/CN2019/122035
Authority: WO
Inventors: 王爱国; 常凤智; 高冬生; 朱清华
Original assignee: 南京腾亚精工科技股份有限公司
Priority date: 2019-06-11
Filing date: 2019-11-29
Publication date: 2020-12-17
Also published as: CN110253503B; EP3984703A4; JP7366158B2; JP2022535984A; CN110253503A; EP3984703A1

Abstract

Disclosed is a tool for striking a fastener, the tool comprising an energy storage mechanism (2), composed of a cylinder (2-2) and a piston (2-1), in a housing (1), wherein the piston (2-1) is connected to a striker (4) extending to a gun nozzle (3), a holding handle (5) is provided on one side of the cylinder (2-2), a nail box (6) is provided on one side of the gun nozzle (3), and a lifting mechanism (7) is provided between the holding handle (5) and the nail box (6); the lifting mechanism (7) includes the striker (4) having meshing teeth distributed at intervals, and a driving wheel (9) having meshing cylinders circumferentially distributed at intervals, with the driving wheel (9) being in transmission connection with an electric motor (8); gear shifting fingers (9-3) radially extend out of opposite sides of the driving wheel (9) at a preset arc length; and a side surface, opposite the meshing teeth, of the striker (4) is provided with an advance convex pin (4-1) capable of meshing with the gear shifting fingers (9-3). Before the meshing cylinder is lifted and meshes with the meshing teeth, the gear shifting fingers (9-3) turn to a meshing and gear shifting position in front of the advance convex pin (4-1); and when the meshing cylinder is lifted and meshes with the meshing teeth, the gear shifting fingers (9-3) turn to shift the advance convex pin (4-1) in order to enable the meshing teeth to be located at a position meshing with the meshing cylinder. The tool has a simple structure, and effectively prevents interference between the re-lifting meshing of the driving wheel and the meshing of the striker.

Description

Fastener hitting tool

Technical field

The invention relates to a fastener striking tool, in particular to an electric gas spring nail gun, belonging to the technical field of electric tools.

Background technique

According to the applicant's understanding, for a long time, tools for fixing one object to another object with nail type fasteners are mainly pneumatic, including high-pressure gas, gas burning, etc., which are not only expensive, but also pose safety risks. For this reason, electric gas spring nail guns have appeared in recent years. The typical structure of this type of nail gun is disclosed in US patents US8011441 and US8267296. This type of nail gun is driven by a motor to rotate the missing tooth to give way to the drive wheel, thereby lifting the firing pin that engages with it, through the piston The compressed air in the cylinder accumulates energy. After that, when the driving wheel reaches the toothless and retreat state and is out of engagement with the striker, the compressed air causes the piston to drive the striker released by the drive wheel to move quickly to complete the nailing action. After that, the driving wheel enters the lifting meshing state again, and the next nailing cycle is performed. Since the energy source comes from electric energy, it has good control performance and is relatively safe.

However, it has been found in practice that when the nail gun is operated occasionally due to various reasons, as shown in Figure 6, the striker is blocked and does not move to the normal limit position shown by the dashed line, so the wheel of the driving wheel If the tooth is lifted and meshed again, it may interfere with the striker, that is, it is blocked and cannot enter the meshing state. At this time, not only the motor drive may be damaged due to the stuck state, but also because the air in the cylinder still has a certain pressure, once the staple is removed , The firing pin will move out of control, causing safety hazards. For this reason, the above-mentioned patent also provides a pawl locking structure to prevent the striker from losing control, but this increases the complexity of parts and assembly.

Summary of the invention

The purpose of the present invention is to provide a fastener striking tool with a simple structure and avoiding jamming in view of the above-mentioned shortcomings of the prior art, thereby ensuring convenient and safe use.

In order to achieve the above objectives, the basic technical solution of the fastener striking tool of the present invention is: an energy storage mechanism composed of a cylinder in a housing and a piston, the piston is connected to a firing pin extending to the gun mouth, and one of the cylinders A handle with a battery pack is arranged on the side, a nail magazine is arranged on one side of the gun mouth, and a lifting mechanism is arranged between the handle and the nail magazine;

The lifting mechanism includes strikers with meshing teeth spaced apart in the length direction, and driving wheels spaced and meshing cylindrically spaced on a predetermined arc length, and the driving wheels are in transmission connection with the electric motor provided by the battery pack;

The driving wheel extends radially from the opposite side of the predetermined arc length, and the side surface of the striker opposite to the meshing tooth has a leading protruding pin that can be engaged with the stop finger, and the stop finger enters and Before the meshing teeth are lifted and meshed, turn to the meshing shifting position in front of the leading protruding pin; when the meshing cylinder enters and meshing with the meshing tooth lifting, the shifting finger is turned to toggle the leading protruding pin so that the meshing tooth is in the meshing cylinder The meshing position.

In this way, no additional locking mechanism is needed, and the structure is simplified; and the stop finger has actually moved the leading convex pin when the meshing cylinder enters and meshes with the meshing tooth lifting, so it effectively prevents the driving wheel from lifting and meshing again with the striker. put one's oar in.

A further improvement of the present invention is that the driving wheel has two symmetrical wheels, and the engagement cylinder is supported between the two symmetrical wheels.

A further improvement of the present invention is that the opposite sides of the two symmetrical wheels with the predetermined arc length respectively extend radially from the gear fingers, and the two sides of the striker opposite to the meshing teeth have cylindrical advances that can mesh with the corresponding gear fingers. Convex pin.

A further improvement of the present invention is that the shift finger has a uniform-speed lifting curve flange which forms a cam pair with the advance convex pin.

A further improvement of the present invention is that the two ends of the uniform lifting curve flange respectively have transitional arcs.

Description of the drawings

The present invention will be further explained below in conjunction with the drawings.

FIG. 1 is a schematic diagram of a three-dimensional structure of Embodiment 1 of the present invention.

2 is a schematic cross-sectional view of the structure of the embodiment in FIG. 1.

3 is a schematic diagram of the three-dimensional structure of the lifting mechanism in the embodiment of FIG. 1.

FIG. 4 is a schematic diagram of the structure of the initial position of the lifting mechanism in FIG. 3.

Fig. 5 is a schematic diagram of the structure of the end position of the lifting mechanism of Fig. 3.

Fig. 6 is a schematic diagram of a prior art meshing interference structure.

Example one

The basic structure of the fastener striking tool of this embodiment is shown in Figures 1 and 2. The rear end of the housing 1 is equipped with an energy storage mechanism 2 composed of a cylinder 2-2 and a piston 2-1, and the piston 2-1 It is fixedly connected with the firing pin 4 extending to the gun nozzle 3. The lower side of the cylinder 2-2 is provided with a handle 5 with a battery pack 5-1. The lower side of the gun nozzle 3 is provided with a nail magazine 6 for arranging nails. The upper side of the handle 5 and the nail magazine 6 is provided. The lifting mechanism 7 and the motor 8 and the reduction transmission mechanism 8-1 located at the lower part.

The lifting mechanism is shown in Fig. 3, which contains strikers 4 with meshing teeth spaced apart in the length direction, and a driving wheel 9 engaged with it. The driving wheel 9 is supported by two symmetrical wheels 9-1 and between the two symmetrical wheels. , The meshing cylinders 9-2 spaced apart on a predetermined arc length are formed, and the driving wheel 9 is drivingly connected to the motor 8 provided by the battery pack 5-1.

The two symmetrical wheels of the driving wheel 9 are radially extended from the opposite sides of the predetermined arc length to the finger 9-3, and the two surfaces of the striker 4 opposite to the meshing teeth have cylindrical advance projections that can mesh with the corresponding finger 9-3. Pin 4-1. The symmetrical wheel structure of this embodiment not only changes the prior art cantilever engagement cylinder into a two-end support structure, but also forms a symmetrical engagement structure of the stop fingers and the leading pins on both sides on this basis, which has stronger bearing capacity, The transmission is more stable. The shift finger 9-3 has a uniform lifting curve flange C that forms a cam pair with the advance convex pin 4-1, and both ends of the uniform lifting curve flange C are respectively provided with transitional arcs, thereby ensuring the smooth and reliable lifting movement.

During work, as shown in Fig. 4, before the engagement cylinder 9-2 enters and engages with the meshing teeth, the shifting finger 9-3 turns to the engagement shifting position in front of the leading convex pin 4-1, even if it encounters a staple, etc. The reason causes the firing pin to deviate from the initial position. The stop finger 9-3 can play a blocking role when it initially engages with the leading pin 4-1, effectively preventing the firing pin from losing control and ensuring safety, and then driving the firing pin to engage Cylinder 9-2 can enter the normal lifting engagement position of the meshing teeth, that is, when the shifting finger 9-3 enters the meshing cylinder 9-2 to lift the meshing teeth, it will turn to move the leading convex pin 4-1 to make the meshing teeth in The meshing position with the meshing cylinder, so as to avoid the jam as shown in FIG. 6. After that, the driving wheel continues to rotate, and the meshing cylinder and the meshing teeth complete the lifting and meshing until the meshing and disengaging position shown in Figure 5 is reached, and the striker will suddenly release the nail.

Tests have shown that regardless of whether the striker is deviated from the initial position due to a staple or other reasons, because the shift finger has been turned to the shift position in front of the leading convex pin before the meshing cylinder enters the meshing tooth lifting engagement, even if there is residual pressure in the cylinder Air, the striker will also be impossible to lose control due to the shift finger, and when the shift finger enters the meshing cylinder and engages with the meshing tooth lifting, it has actually moved the leading convex pin, which not only plays a role in starting the lift, but also Turning to toggle the leading protruding pin to make the meshing tooth in the meshing position with the meshing cylinder, so the correct meshing is ensured, and the meshing interference of the driving wheel for lifting meshing and the striker is effectively avoided.

In addition to the above embodiments, the present invention can also have other changes. For example, in order to make the protruding pin on the striker only receive the force along the movement direction of the striker during the rotation of the driving wheel, the stop finger can also be designed as a lifting flange with other curves. All technical solutions formed by equivalent replacements or equivalent transformations fall within the protection scope of the present invention.

Claims

A fastener striking tool includes an energy storage mechanism composed of a cylinder in a housing and a piston, the piston is connected with a firing pin extending to the gun mouth, and one side of the cylinder is provided with a grip with a battery pack, A nail box is provided on one side of the gun mouth, and a lifting mechanism is provided between the handle and the nail box; the lifting mechanism includes a striker with meshing teeth spaced apart in the length direction, and meshing cylinders spaced apart on a predetermined arc length The driving wheel is connected to a motor driven by a battery pack that provides electric energy; characterized in that:

The driving wheel extends radially from the opposite side of the predetermined arc length, and the side surface of the striker opposite to the meshing tooth has a leading protruding pin that can be engaged with the stop finger, and the stop finger enters and Before the meshing teeth are lifted and meshed, turn to the meshing shifting position in front of the leading protruding pin; when the meshing cylinder enters and meshing with the meshing tooth lifting, the shifting finger is turned to toggle the leading protruding pin so that the meshing tooth is in the meshing cylinder The meshing position.
The fastener striking tool according to claim 1, wherein the driving wheel has two symmetrical wheels, and the engagement cylinder is supported between the two symmetrical wheels.
The fastener striking tool according to claim 2, characterized in that: the two symmetrical wheels on the opposite sides of the predetermined arc length respectively extend radially with a stop finger, and the striker has separate surfaces on opposite sides of the meshing tooth. A cylindrical leading convex pin that can engage with the corresponding gear finger.
The fastener striking tool according to claim 3, characterized in that the stop finger has a uniform lifting curve flange which forms a cam pair with the advance convex pin.
The fastener striking tool according to claim 4, wherein the two ends of the uniform-speed lifting curve flange respectively have transitional arcs.