CN110253503B

CN110253503B - Fastener beating tool

Info

Publication number: CN110253503B
Application number: CN201910499998.7A
Authority: CN
Inventors: 王爱国; 常凤智; 高冬生; 朱清华
Original assignee: Nanjing Toua Hardware & Tools Co ltd
Current assignee: Nanjing Toua Hardware & Tools Co ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2022-03-22
Anticipated expiration: 2039-06-11
Also published as: EP3984703A1; JP7366158B2; WO2020248531A1; JP2022535984A; EP3984703A4; CN110253503A

Abstract

The invention relates to a fastener striking tool, and belongs to the technical field of electric tools. The tool comprises an energy storage mechanism consisting of a cylinder body and a piston in a shell, wherein the piston is connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the lifting mechanism comprises firing pins with meshing teeth distributed at intervals and driving wheels with meshing cylinders distributed at intervals in the circumferential direction, and the driving wheels are in transmission connection with the motor; a gear shifting finger radially extends out of the side opposite to the preset arc length of the driving wheel, an advance convex pin which can be engaged with the gear shifting finger is arranged on the side surface of the firing pin opposite to the engaging tooth, and the gear shifting finger is rotated to an engaging gear shifting position in front of the advance convex pin before the engaging cylinder enters into lifting engagement with the engaging tooth; when the engaging cylinder enters into the lifting engagement with the engaging teeth, the shift finger shifts to shift the advanced convex pin to enable the engaging teeth to be in the engaging position with the engaging cylinder. The invention has simple structure and effectively avoids the engagement interference between the driving wheel for lifting and engaging the striker again.

Description

Fastener beating tool

Technical Field

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

Background

As far as the applicant is aware, tools for securing one object to another by means of nail-like fasteners have long been pneumatic-based, including high pressure gas, gas combustion, etc., and are not only expensive, but also present safety hazards. For this reason, electric gas spring nail guns have been developed in recent years, and typical constructions thereof are disclosed in US8011441 and US8267296, in which a motor drives a missing tooth abdicating drive wheel to rotate, thereby lifting a striker engaged therewith, and compressing air in a cylinder by a piston to store energy. And then, when the driving wheel reaches the tooth-missing yielding state and is disengaged from the striker, the compressed air enables the piston to drive the striker released by the driving wheel to move quickly, and the nailing action is finished. Thereafter, the drive wheel again enters the lifting engagement state and the next stapling cycle is performed. Because the energy comes from the electric energy, consequently control the performance good, it is comparatively safe.

However, it has been found in practice that when such a nail gun is accidentally jammed for various reasons during operation, as shown in fig. 6, because the striker is retarded and not moved to the normal limit position shown by the dotted line, the teeth of the driving wheel may interfere with the striker, i.e., be retarded from entering the engagement state, and not only may the driving member be damaged due to the motor being in the stuck state, but also the air in the air cylinder still has a certain pressure, and once the jam is removed, the striker may run away and cause a safety hazard. For this reason, the above patent also provides a pawl lock structure to prevent the striker from operating out of control, but this adds complexity to the parts and assembly.

Disclosure of Invention

The invention aims to: aiming at the defects in the prior art, the fastener striking tool which is simple in structure and can avoid clamping stagnation is provided, so that convenience and safety in use are ensured.

In order to achieve the purposes, the basic technical scheme of the fastener striking tool is as follows: the energy storage mechanism comprises a cylinder body and a piston in a shell, wherein the piston is connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box;

the lifting mechanism comprises firing pins with meshing teeth distributed at intervals in the length direction and driving wheels with meshing cylinders distributed at intervals in a preset arc length, and the driving wheels are in transmission connection with a motor for providing electric energy for the battery pack;

a gear shifting finger radially extends out of the side opposite to the preset arc length of the driving wheel, an advancing convex pin which can be engaged with the gear shifting finger is arranged on the side surface of the firing pin opposite to the engaging tooth, and the gear shifting finger rotates to an engaging gear shifting position in front of the advancing convex pin before the engaging cylinder enters into lifting engagement with the engaging tooth; when the meshing cylinder enters into lifting engagement with the meshing teeth, the shift finger is rotated to shift the advanced convex pin to enable the meshing teeth to be in the meshing position with the meshing cylinder.

Therefore, a locking mechanism is not required to be additionally arranged, and the structure is simplified; and when the engaging cylinder enters and is in lifting engagement with the engaging teeth, the shift finger actually shifts the advanced convex pin, so that the engagement interference between the driving wheel and the firing pin during the lifting engagement is effectively avoided.

It is a further refinement of the invention that the drive wheel has two symmetrical wheel segments, the meshing cylinder being supported between the two symmetrical wheel segments.

Still further perfection of the present invention is that the two symmetrical wheel sheets have blocking fingers radially extending from opposite sides of the predetermined arc length, and the two side surfaces of the striker opposite to the engaging teeth have cylindrical advance pins engageable with the corresponding blocking fingers.

It is a further refinement of the present invention that the shift finger has a constant lift curve flange that forms a cam set with the advance boss pin.

The invention has the further improvement that the two ends of the constant-speed lifting curve flange are respectively provided with a transition circular arc.

Drawings

The invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the embodiment of fig. 1.

Fig. 3 is a schematic perspective view of the lifting mechanism of the embodiment of fig. 1.

Fig. 4 is a structural view of an engagement starting position of the lifting mechanism of fig. 3.

Fig. 5 is a schematic view of the engagement end position of the lifting mechanism of fig. 3.

Fig. 6 is a schematic view of a prior art engagement interference structure.

Detailed Description

Example one

The basic structure of the fastener striking tool of the embodiment is shown in fig. 1 and 2, an energy storage mechanism 2 consisting of a cylinder 2-2 and a piston 2-1 is arranged at the rear end of a shell 1, and the piston 2-1 is fixedly connected with a firing pin 4 extending to a gun nozzle 3. A grab handle 5 with a battery pack 5-1 is arranged at the lower side of the cylinder body 2-2, a nail box 6 for arranging the strip nails is arranged at the lower side of the gun nozzle 3, and a lifting mechanism 7 positioned at the upper part, a motor 8 positioned at the lower part and a speed reduction transmission mechanism 8-1 are arranged between the grab handle 5 and the nail box 6.

The lifting mechanism is shown in fig. 3 and comprises strikers 4 with meshing teeth distributed at intervals in the length direction and driving wheels 9 meshed with the strikers, wherein the driving wheels 9 are composed of two symmetrical wheel sheets 9-1 and meshing cylinders 9-2 which are supported between the two symmetrical wheel sheets and distributed at intervals on a preset arc length, and the driving wheels 9 are in transmission connection with a motor 8 for supplying electric energy to a battery pack 5-1.

The opposite sides of the preset arc length of the two symmetrical wheel sheets of the driving wheel 9 are respectively extended with a shift finger 9-3 in the radial direction, and the two side surfaces of the firing pin 4 opposite to the meshing teeth are provided with cylindrical advanced convex pins 4-1 which can be meshed with the corresponding shift fingers 9-3 respectively. The symmetrical wheel piece structure of this embodiment not only changes prior art's cantilever meshing cylinder into both ends bearing structure, has formed the symmetrical meshing structure of both sides fender thumb and leading protruding round pin moreover on this basis, and the bearing capacity is stronger, the transmission is more stable. The shift finger 9-3 is provided with a constant-speed lifting curve flange C which forms a cam pair with the advance convex pin 4-1, and two ends of the constant-speed lifting curve flange C are respectively provided with a transition arc, so that the stability and reliability of the lifting motion are ensured.

In operation, as shown in fig. 4, before the engaging cylinder 9-2 enters into lifting engagement with the engaging teeth, the shift finger 9-3 is shifted to the engaging shift position in front of the advance boss pin 4-1, even if the striker deviates from the initial position due to reasons such as staple, the shift finger 9-3 can play a role of blocking when initially engaging with the advance boss pin 4-1, so as to effectively prevent the striker from out of control, and ensure safety, and then the striker is shifted to the normal lifting engagement position where the engaging cylinder 9-2 can enter into the engaging teeth through transmission, that is, when the engaging cylinder 9-2 enters into lifting engagement with the engaging teeth, the shift finger 9-3 is shifted to the advance boss pin 4-1 to make the engaging teeth be in the engagement position with the engaging cylinder, so as to avoid the occurrence of the jamming shown in fig. 6. Thereafter, the drive wheel continues to rotate, and the engaging cylinder completes the lifting engagement with the engaging teeth until the engagement disengaging position shown in fig. 5 is reached, and the striker suddenly releases the nailing.

Experiments show that whether the striker deviates from the initial position due to reasons such as staple bolts or not, the striker cannot generate out-of-control action due to the shift finger which rotates to the shift position in front of the advance convex pin before the engagement cylinder enters and is in lifting engagement with the engagement teeth, even if residual pressure air is left in the cylinder, and the shift finger actually shifts the advance convex pin when the engagement cylinder enters and is in lifting engagement with the engagement teeth, so that not only the starting action of lifting is achieved, but also the engagement teeth are in the engagement position with the engagement cylinder due to the shift to the advance convex pin, so that correct engagement is ensured, and the engagement interference between the driving wheel and the striker is effectively avoided when the driving wheel lifts and engages again.

In addition to the embodiments described above, the present invention may have other variations. For example, the shift finger can be designed as a lifting flange with other curves in order to make the protruding pin on the striker only receive a force in the moving direction of the striker during the rotation of the drive wheel. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.

Claims

1. A fastener striking tool comprises an energy storage mechanism consisting of a cylinder body and a piston in a shell, wherein the piston is connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the lifting mechanism comprises firing pins with meshing teeth distributed at intervals in the length direction and driving wheels with meshing cylinders distributed at intervals in a preset arc length, and the driving wheels are in transmission connection with a motor for providing electric energy for the battery pack; the method is characterized in that:

2. The fastener driver tool of claim 1, further comprising: the driving wheel is provided with two symmetrical wheel sheets, and the meshing cylinder is supported between the two symmetrical wheel sheets.

3. A fastener driver according to claim 2, wherein: and the two sides of the striker opposite to the meshing teeth are provided with cylindrical advanced convex pins which can be meshed with the corresponding shift fingers respectively.

4. A fastener driver according to claim 3, wherein: the shift finger is provided with a constant-speed lifting curve flange which forms a cam pair with the advanced convex pin.

5. The fastener driver tool of claim 4, wherein: transition circular arcs are respectively arranged at two ends of the constant-speed lifting curve flange.