Angled nail gun

Abstract

This invention discloses a slanted nail gun, comprising: an energy storage mechanism; a nail-driving mechanism including a firing pin and a piston; the firing pin having several firing pin side teeth extending towards a lifting mechanism; the firing pin being slidably fixed within a nail-driving seat, the front end of which has a striking head that abuts against the workpiece; the lifting mechanism including a driver and a drive wheel, the drive wheel being sleeved on the output shaft of the driver, and several drive pins being provided on the outer periphery of the drive wheel, the drive pins engaging with the firing pin side teeth; and a nail magazine that feeds nails from rear to front at a feed angle, the feed angle being inclined left-right relative to the ideal rotation axis of the drive wheel; the generatrix of the tooth profile of the firing pin side teeth is not completely parallel to the axial generatrix of the drive pins, and the distance between the upper bottom surface of the firing pin side teeth and the axis of the drive pin is slightly greater than the distance between the lower bottom surface of the firing pin side teeth and the axis of the drive pin. This invention reduces the wear of the firing pin teeth and extends the service life of the firing pin.

Description

Technical Field

[0001] This invention relates to a slanted nail gun, belonging to the field of power tool technology. Background Technology

[0002] Electric pneumatic nail guns and similar fastener-driving tools use compressed air to power a piston in a cylinder, which in turn drives a firing pin to drive nails into the workpiece. These are commonly used tools in the construction and decoration industries. A typical example is the structure described in Chinese invention patent application CN 115397621A, which discloses a "powered fastener driver." This driver includes an energy storage mechanism consisting of a cylinder and a piston within a housing. The front end of the nail-driving base is equipped with a retractable nozzle, and a nail magazine is located on one side. A handle with a battery pack is located on one side of the cylinder, and a nail magazine is located on the other side of the nozzle. The nail magazine contains a nail pusher that pushes the nails towards the nail-driving base. Between the handle and the nail magazine is an electric lifting mechanism that drives the piston to compress and store energy. The lifting mechanism includes a drive wheel that meshes with the firing pin, and the drive wheel is connected to a motor powered by the battery pack. When the nozzle is pressed down, the motor will be started, and the lifting mechanism will drive the firing pin from the temporarily locked ready position to drive the piston to compress air. After the firing pin is disengaged from the lifting mechanism, it will be suddenly released to strike the row of nails in the nail magazine that has been pushed into the nail holder by the nail pusher, causing it to be ejected from the nozzle.

[0003] This type of inserting tool includes a magazine containing a large number of inserting tools to be supplied to the inserting path. The feed direction of the cartridge is connected to the drive path at its front end. The magazine is mounted diagonally around the drive shaft, for example, to the left, to avoid interference with the lifting mechanism and for a compact arrangement. In this case, the feed direction of the cartridge is inclined relative to the axis of rotation of the wheel. Therefore, the inserting tools are fed into the inserting path in an inclined posture that swings to one side about the drive shaft.

[0004] To address the aforementioned issues, Chinese utility model patent CN 221271036U proposed a "slanted-row nail-shooting tool." The technical solution in this patent, where "the tooth profile of the firing pin side teeth is formed by a generatrix parallel to the axial direction of the drive pin," achieved some effectiveness. However, in practical applications, it was found that due to bearing clearance and the bending deformation of the drive shaft under the pressure of the firing pin lifting side, the actual rotation axis of the drive wheel deviates from the ideal rotation axis by about 1° during high-speed rotation of the drive driver. This results in the effective length of the contact line between the tooth profile of the firing pin side teeth and the axial generatrix of the drive pin being shorter than the tooth width, forming an off-center load contact and further aggravating the wear of the firing pin teeth. This wear is very common and difficult to eliminate for a long time, leading to strong user dissatisfaction. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a slanted nail gun that can effectively reduce the wear of the firing pin teeth and extend the service life of the firing pin.

[0006] The present invention provides a slanted nail gun, comprising:

[0007] Energy storage mechanism, including gas storage chamber and cylinder;

[0008] The nail-driving mechanism includes a firing pin and a piston, wherein the piston is located at the rear end of the firing pin and is slidably mounted on the inner wall of the cylinder; the firing pin extends toward the lifting mechanism and has a plurality of firing pin side teeth.

[0009] The firing pin is slidably mounted in the nail-driving base, and the front end of the nail-driving base is provided with a striking head that abuts against the workpiece;

[0010] The lifting mechanism includes a driver and a drive wheel. The drive wheel is sleeved on the output shaft of the driver. The outer periphery of the drive wheel is provided with a plurality of drive pins, which mesh with the side teeth of the firing pin.

[0011] The nail box feeds nails to the nailing seat at a predetermined feed angle, and the feed angle is the angle between the drive wheel axis and the projection of the feed direction onto the vertical plane of the nailing direction, wherein the feed angle α is between 10° and 30°.

[0012] The generatrix of the tooth profile of the impact pin side tooth is not parallel to the axial generatrix of the drive pin, and the distance between the upper bottom surface of the impact pin side tooth and the axis of the drive pin is slightly smaller than the distance between the lower bottom surface of the impact pin side tooth and the axis of the drive pin.

[0013] Furthermore, when the drive pin is not under force, the angle between the generatrix of the tooth profile of the impact pin side tooth and the axis of the drive pin is β, and 0°<β<5°.

[0014] Furthermore, the angle between the engagement surface of the striker side tooth and the drive pin and the striker axis is γ, and 80°<γ<90°.

[0015] Furthermore, the firing pin is planar, with its thickness direction facing the feeding direction of the nail, and the offset angle of the firing pin is the same as the nail feed angle of the nail cartridge.

[0016] Furthermore, the contact area between the last released firing pin side tooth and the pin is greater than or equal to the contact area between the other firing pin side teeth and the pin.

[0017] Furthermore, when the drive pin is not under force, the angle between the generatrix of the tooth profile of the impact pin side tooth and the generatrix of the axial direction of the drive pin is β, and 0° < β < 2°.

[0018] Furthermore, when the drive pin is not under force, the angle between the generatrix of the tooth profile of the impact pin side tooth and the generatrix of the axial direction of the drive pin is β, and 1° < β < 2°.

[0019] Compared with existing technologies, this invention achieves the following beneficial effects: 1. Reduces the wear of the striker teeth and extends the service life of the striker. 2. The non-parallel design of the striker side teeth and the drive pin compensates for the deflection angle caused by bearing clearance, resulting in a simple and ingenious structure. 3. Ensures that the last released striker tooth and the drive pin have the largest possible contact surface, further reducing the wear of the drive pin and striker teeth. Attached Figure Description

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0021] Figure 1 This is a top-view sectional view of a specific embodiment of the present invention;

[0022] Figure 2 This is a sectional view taken from the front view of a specific embodiment of the present invention.

[0023] Figure 3 for Figure 2 Cross-sectional view of the drive unit and drive wheels;

[0024] Figure 4 This is a front view of the drive wheel under ideal conditions in a specific embodiment;

[0025] Figure 5 This is a front view of the drive wheel in its actual state in a specific embodiment;

[0026] Figure 6 This is a schematic diagram of the engagement state of the striker and drive wheel in CN221271036U, which uses entirely traditional technology.

[0027] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0028] Figure 8 This is a schematic diagram of the actual state in which the firing pin and the drive wheel are engaged in the CN 221271036U.

[0029] Figure 9 for Figure 8 A 3D diagram of the firing pin;

[0030] Figure 10 This is a schematic diagram of the ideal engagement state between the firing pin and the drive wheel in a specific embodiment;

[0031] Figure 11 for Figure 10A 3D diagram of the firing pin;

[0032] Figure 12 for Figure 10 Top view of the firing pin;

[0033] Figure 13 This is a schematic diagram of the actual engagement state between the striker and the drive wheel in a specific embodiment.

[0034] In the diagram: 1. Nail holder, 2. Cylinder, 3. Piston, 4. Strike pin, 401. Strike pin side tooth, 402. Engagement surface, 403. Upper bottom surface, 404. Lower bottom surface; 5. Driver, 502. Bearing, 6. Drive wheel, 7. Drive pin, 8. Nail box, 9. Strike head. Detailed Implementation

[0035] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0038] like Figure 4 and Figure 5 As shown, due to the clearance of bearing 502, during the high-speed nailing process of the nail gun, since the drive wheel is located on one side of the bearing, during the lifting process of the drive wheel, it is subjected to the force of the lifting side of the firing pin. The output shaft will deform under the force. At this time, the output shaft cannot rotate according to the ideal rotation axis M1. The output shaft tilts towards the nail discharge direction, which in turn causes the drive pin 6 on the drive wheel to tilt towards the nail discharge direction 4. At this time, a deflection angle β will be generated between the actual axis M2 of the drive wheel 6 and the ideal rotation axis.

[0039] like Figure 6 and Figure 7 As shown, if the tooth profile of the striker side tooth 401 is changed from a generatrix parallel to the axis of the drive pin 7, as in CN221271036U, it will be as follows: Figure 8 and Figure 9As shown, the lower bottom surface 404 of the impact pin side tooth 401 contacts the drive pin 7 earlier than the upper bottom surface 403, which in turn causes the engagement surface 402 between the impact pin side tooth 401 and the drive pin 7 to become smaller. This increases the stress borne by the side tooth of the impact pin 4, exacerbates the wear of the impact pin 4, and reduces the service life of the impact pin 4.

[0040] like Figures 1-3 As shown, an oblique row nail gun of the present invention includes:

[0041] An energy storage mechanism, including an air storage chamber and a cylinder 2;

[0042] The nail-driving mechanism includes a firing pin 4 and a piston 3. The piston 3 is located at the rear end of the firing pin 4 and is slidably sleeved on the inner wall of the cylinder 2. The firing pin 4 has several firing pin side teeth 401 extending towards the lifting mechanism.

[0043] The firing pin 4 is slidably fixed inside the nail-driving base 1, and the front end of the nail-driving base 1 is provided with a striking head 9 that abuts against the workpiece;

[0044] The lifting mechanism includes a driver 5 and a drive wheel 6. The drive wheel 6 is sleeved on the output shaft of the driver 5. Several drive pins 7 are provided on the outer periphery of the drive wheel 6. The drive pins 7 engage with the side teeth 401 of the striker pin.

[0045] The nail box 8 feeds nails from rear to front at a feed angle, and the feed angle is tilted in the left-right direction relative to the ideal rotation axis of the drive wheel 6, with the tilt angle α between 5° and 20°.

[0046] The tooth profile of the striker side tooth 401 is not completely parallel to the axial generatrix of the drive pin 7, and the distance between the upper bottom surface 403 of the striker side tooth 401 and the axis of the drive pin 7 is slightly greater than that between the lower bottom surface 404 of the striker side tooth 401.

[0047] like Figure 8 As shown, under ideal conditions (where the drive pin is not under stress), the angle β between the generatrix of the tooth profile of the impact pin side tooth 401 and the axial generatrix of the drive pin 7 is 0° < β < 5°, with the optimal choice for angle β being approximately 1°. The definition of the generatrix of the tooth profile is referenced in CN221271036U. During actual nailing, due to issues such as bearing 502 clearance and deformation under stress, the rotation axis of the drive pin 7 is precisely parallel to the generatrix of the tooth profile of the impact pin side tooth 401, resulting in uniform stress on the impact pin side tooth 401.

[0048] like Figure 10 and Figure 12 As shown, the angle γ between the projection of the engagement surface 402 of the firing pin side tooth 401 and the driving pin 7 and the axis of the firing pin 4 is 85°. The firing pin 4 is planar, with its thickness direction facing the feeding direction of the nail, and the offset angle of the firing pin 4 is the same as the nail feed angle of the nail cartridge 8. Figure 13As shown, due to the presence of the included angle γ, the tooth profile generatrix of the last released firing pin side tooth is approximately parallel to the longitudinal axis of the drive pin. At this time, the firing pin 4 is in an ideal stress state, which is conducive to ensuring the long-term stability of the nailing operation and extending the service life of the nail gun.

[0049] like Figure 11 As shown, the engagement surface 402 of the last released striker side tooth 401 with the pin is greater than or equal to the engagement surface 402 of the other striker side teeth 401 with the pin, wherein the last released striker side tooth is the striker side tooth that is further away from the piston than the other striker side teeth.

[0050] like Figure 9 As shown, if CN221271036U is used, the contact area between the engagement surface of the last released firing pin side tooth and the drive pin will be smaller than the contact area between the other firing pin side teeth and the drive pin. Since the last firing pin side tooth is most prone to wear during use, and the larger the engagement surface 402 of the firing pin side tooth 401, the less pressure the drive pin 7 bears, therefore, priority should be given to ensuring the contact area between the last firing pin side tooth 401 and the drive pin 7. This will extend the service life of the nail gun and reduce the wear of the drive pin 7 and the firing pin side tooth 401.

[0051] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A slanted nail gun, comprising: Energy storage mechanism, including gas storage chamber and cylinder; The nail-driving mechanism includes a firing pin and a piston, wherein the piston is located at the rear end of the firing pin and is slidably mounted on the inner wall of the cylinder; the firing pin extends toward the lifting mechanism and has a plurality of firing pin side teeth. The firing pin is slidably mounted in the nail-driving base, and the front end of the nail-driving base is provided with a striking head that abuts against the workpiece; The lifting mechanism includes a driver and a drive wheel. The drive wheel is sleeved on the output shaft of the driver. The outer periphery of the drive wheel is provided with a plurality of drive pins, which mesh with the side teeth of the firing pin. The nail box feeds nails to the nailing seat at a predetermined feed angle, and the feed angle is the angle between the drive wheel axis and the projection of the feed direction onto the vertical plane of the nailing direction, wherein the feed angle α is between 10° and 30°. The characteristic feature is that the generatrix of the tooth profile of the impact pin side tooth is not parallel to the generatrix of the drive pin, and the distance between the upper bottom surface of the impact pin side tooth and the axis of the drive pin is less than the distance between the lower bottom surface of the impact pin side tooth and the axis of the drive pin. When the drive pin is not under force, the angle between the generatrix of the tooth profile of the impact pin side tooth and the axis of the drive pin is β, and 0°<β<5°.

2. The angle firing nail gun of claim 1, wherein: The angle between the mating surface of the striker side teeth and the drive pin and the striker axis is γ, and 80° < γ < 90°.

3. The angle firing nail gun of claim 1, wherein: The firing pin is planar, with its thickness direction facing the feeding direction of the nail, and the offset angle of the firing pin is the same as the nail feed angle of the nail cartridge.

4. The oblique-row nail gun according to claim 1, characterized in that: The contact area between the last released striker side tooth and the pin is greater than or equal to the contact area between the other striker side teeth and the pin.

5. The oblique-row nail gun according to claim 1, characterized in that: When the drive pin is not under force, the angle between the generatrix of the tooth profile of the impact pin side tooth and the generatrix of the axial direction of the drive pin is β, and 0°<β<2°.

6. The oblique-row nail gun according to claim 5, characterized in that: When the drive pin is not under force, the angle between the generatrix of the tooth profile of the impact pin side tooth and the generatrix of the axial direction of the drive pin is β, and 1° < β < 2°.

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