Fastener driving tool

Abstract

The utility model discloses a driving tool of a fastener, which comprises a striker with teeth, a firing mechanism for firing the striker with teeth and a lifting and releasing mechanism for lifting the striker, the firing mechanism comprises a cylinder seat, and the lifting and releasing mechanism comprises a fluted disc for lifting the striker, a transmission shaft for driving the fluted disc to rotate and a reduction gearbox for driving the transmission shaft; one end of the transmission shaft is positioned in the cylinder seat, and the other end is connected with the output end of the reduction gearbox; wherein connecting pieces are arranged at the two ends of the transmission shaft respectively, and each connecting piece at least comprises a supporting sleeve. Compared with the prior art, the driving tool disclosed by the utility model is lower in cost and simpler to assemble, and does not need a large amount of maintenance in the use process, so that the working efficiency of the driving tool can be improved.

Description

Technical Field

[0001] This utility model relates to a driving tool, specifically a driving tool for fasteners. Background Technology

[0002] A nail gun, as a fastener-driving tool, includes a housing that stores pressurized gas, a cylinder inside the housing, and a piston within the cylinder. High-pressure gas is always present at the upper end of the piston. Its working principle is as follows: after being powered on, the motor starts rotating, driving a transmission mechanism through a reduction gear. The transmission mechanism drives the actuator, moving the firing pin from its lower end position to its upper initial position. During this process, the gas in the cylinder and its housing is compressed, and the gun stops at the initial position, awaiting the next firing. Specifically, the piston is connected to a toothed firing pin. The teeth of the firing pin correspond one-to-one with the cylindrical pins of the lifting and releasing mechanism, which is integrated with the motor and reduction gear. When the cylindrical pin at the end of the lifting and releasing mechanism engages with the teeth at the end of the toothed firing pin, reaching the highest initial position, the stored compressed gas almost reaches its maximum pressure. When the operator pulls the trigger, the lifting and releasing mechanism rotates in the set direction, entering its neutral position. The last tooth of the firing pin is fully released, and the firing pin rapidly strikes the fastener, causing it to engage with the object being struck, thus joining the two objects together.

[0003] Chinese patent document CN217301527U discloses a tool for driving fasteners, including a gas chamber shell and a cylinder seat. The gas chamber shell is provided with a cylinder, a piston, and a toothed striker connected to the piston along the driving direction. The cylinder seat is perpendicular to the driving direction and contains a columnar lifting plate and a lifting shaft connected to the lifting plate. It also includes a motor, which is connected to a planetary gear reducer. The output end of the planetary gear reducer is connected to the rear end of the lifting shaft. It has the advantages of stable overall connection structure and firm structural positioning.

[0004] In this prior art, the front end of the lifting shaft is supported within the cylinder housing by bearings and bearing supports, while the rear end of the lifting shaft and the output end of the gearbox are fixed to the gearbox housing by double bearings. This results in increased product costs and a higher susceptibility to malfunctions during use, requiring frequent maintenance and thus reducing work efficiency. Utility Model Content

[0005] To address the technical problem of low work efficiency caused by frequent maintenance of existing tools, this utility model provides a fastener driving tool, including a toothed firing pin, a firing mechanism for firing the toothed firing pin, and a lifting and releasing mechanism for lifting the firing pin. The firing mechanism includes a cylinder seat, and the lifting and releasing mechanism includes a toothed disc for lifting the firing pin, a drive shaft for driving the toothed disc, and a reduction gearbox for driving the drive shaft. One end of the drive shaft is located inside the cylinder seat, and the other end of the drive shaft is connected to the output end of the reduction gearbox. Connectors are provided at both ends of the drive shaft, and each connector includes at least one support sleeve.

[0006] In the prior art, the bearings used are precision mechanical components that can reduce friction loss, which are therefore costly to manufacture and require a lot of maintenance during use. In contrast, the support sleeve used in this solution is cheaper, simpler to assemble, and requires less maintenance during use, thereby improving the working efficiency of the drive tool.

[0007] Preferably, a grease storage compartment is provided on the inner side of the support sleeve. In this design, storing lubricating grease in the grease storage compartment better ensures the rotation of the drive shaft, thereby ensuring that the drive tool can work better.

[0008] Preferably, the grease storage section is a groove located inside the support sleeve. In this design, a groove is chosen as the grease storage section, which simplifies the structure and further reduces the manufacturing cost of the drive tool.

[0009] Preferably, the groove is located in the middle of the support sleeve. In this design, placing the grease storage groove in the middle of the support allows the lubricating grease to better lubricate the drive shaft.

[0010] Preferably, the groove is an annular groove located inside the support sleeve. This design uses an annular groove, which has a simple structure and can further reduce the manufacturing cost of the drive tool.

[0011] Preferably, the support sleeve includes an inner hole that matches the drive shaft, and guide surfaces are provided at both ends of the inner hole in the axial direction. In this design, the guide surfaces facilitate the installation of the support sleeve and the drive shaft, thereby improving the assembly efficiency of the support sleeve.

[0012] Preferably, the gear disc is located inside the cylinder seat, and a notch is provided on the side of the cylinder seat corresponding to the gear disc to avoid misalignment of the gear disc. During use, when the gear disc gets stuck, the cylindrical pin of the gear disc interferes with the teeth on the impact pin, causing the gear disc to misalign. By providing the notch on the cylinder seat, the misaligned gear disc will be directed into the notch, thus avoiding damage to the gear disc after misalignment.

[0013] Preferably, the firing pin is located on one side of the cylinder seat, and the notch is located on the other side of the cylinder seat.

[0014] Preferably, the output end of the gearbox is splined to the drive shaft. Using a spline connection in this design allows for a tighter fit between the gearbox and the drive shaft, which is beneficial for the efficient transmission of torque.

[0015] This utility model has the following beneficial effects:

[0016] 1. Compared with the prior art, the drive tool in this utility model has lower cost, simpler assembly, and does not require a lot of maintenance during use, which can improve the working efficiency of the drive tool.

[0017] 2. In this utility model, the grease storage section can lubricate the drive shaft, better ensure the rotation of the drive shaft, and thus ensure that the drive tool can work better.

[0018] 3. In this utility model, the spline connection method for connecting the output end of the gearbox to the drive shaft enables a tighter connection between the output end of the gearbox and the drive shaft, which is beneficial for the full transmission of torque. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of Embodiment 1 of the driving tool for the fastener of this utility model;

[0020] Figure 2 for Figure 1 A structural schematic diagram of the drive shaft and gearbox section;

[0021] Figure 3 This is a sectional view of the support sleeve;

[0022] Figure 4 Assembly drawing of the gear plate and cylinder block;

[0023] Figure 5 This is a structural schematic diagram of the cylinder block section;

[0024] Figure 6 This is a schematic diagram of the drive shaft and gearbox in Example 2;

[0025] Figure 7 This is a cross-sectional view of the support sleeve in Example 3. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] 1. Definition

[0028] Bearings are an important component in modern mechanical equipment. Their main function is to support rotating mechanical parts, reduce the coefficient of friction during their movement, and ensure their rotational accuracy.

[0029] Bushings: Bushings are fittings used on the outside of mechanical parts to achieve functions such as sealing and wear protection. They refer to rings that act as gaskets. In moving parts, long-term friction causes wear on the parts. When the clearance between the shaft and the hole wears to a certain extent, the parts must be replaced. Therefore, designers choose materials with low hardness and good wear resistance for bushings or bushings. This can reduce the wear of the shaft and the seat. When the bushing or bushing wears to a certain extent, it can be replaced, thus saving the cost of replacing the shaft or seat.

[0030] Spline connection is a mechanical connection method suitable for applications with heavy loads and high centering requirements. It can be used for both static and dynamic connections. Spline connections achieve the fixation and torque transmission between shafts and components through the cooperation of external and internal splines.

[0031] 2. The reference numerals in the accompanying drawings of the instruction manual include: cylinder seat 1, bearing 2, drive shaft 3, support sleeve 4, gearbox 5, spline 6, impact pin 7, gear plate 8, notch 9, piston 10, guide surface 21, and grease storage section 22.

[0032] Example 1

[0033] The basics are as follows: Figures 1-5 As shown: a fastener driving tool, including a toothed striking pin 7;

[0034] A firing mechanism for firing the toothed firing pin 7; the firing mechanism includes a housing for storing a certain pressure of gas, a cylinder disposed inside the housing, a piston 10 in the cylinder, and a cylinder seat 1. The toothed firing pin 7 is fixed on the piston 10.

[0035] The lifting and releasing mechanism for the lifting striker 7 includes a motor, a geared disc 8 for lifting the striker 7, a transmission shaft 3 for driving the geared disc 8 to rotate, and a reduction gearbox 5 for driving the transmission shaft 3. The cylindrical pins of the geared disc 8 correspond one-to-one with the protruding teeth on the toothed striker 7.

[0036] The cylinder is positioned along the driving direction of the outer casing, and the cylinder base 1 is located at the bottom of the cylinder and perpendicular to the driving direction of the cylinder. A geared disc 8 and a drive shaft 3 are housed within the cylinder base 1, with the geared disc 8 connected to the output end of the drive shaft 3. The output end of the drive shaft 3 is located within the cylinder base 1, and the power end of the drive shaft 3 is connected to the output end of the reduction gearbox 5 via a spline 6.

[0037] The drive shaft 3 has connectors at both ends, each connector including at least one support sleeve 4, which is a bushing. In this embodiment, the connectors at both ends of the drive shaft 3 are the support sleeve 4 and the bearing 2, respectively. That is, the connector at one end of the drive shaft 3 is the bearing 2, and the connector at the other end is the support sleeve 4. In this embodiment, the connector at the output end of the drive shaft 3 is the bearing 2, and the connector at the power end of the drive shaft 3 is the connecting sleeve. Figure 2 As shown, the left end of the transmission shaft 3 is the output end, and the right end of the transmission shaft 3 is the power end. In other embodiments, the connecting part of the transmission output end can also be a connecting sleeve, and the connecting part of the power end of the transmission shaft 3 is a bearing 2. The bearing 2 is a ball bearing 2. A rolling bearing 2 is a precision mechanical component that converts the sliding friction between the rotating shaft and the bearing seat into rolling friction, thereby reducing friction loss. A rolling bearing 2 generally consists of four parts: an inner ring, an outer ring, rolling elements, and a cage. The inner ring's function is to cooperate with the shaft and rotate with the shaft; the outer ring's function is to cooperate with the bearing seat 2 and provide support; the rolling elements are evenly distributed between the inner and outer rings by means of the cage, and their shape, size, and number directly affect the performance and life of the rolling bearing 2; the cage enables the rolling elements to be evenly distributed, guides the rotation of the rolling elements, and provides lubrication. In other embodiments, the bearing 2 can also be other types of bearing 2.

[0038] The support sleeve 4 includes an inner hole that matches the drive shaft 3, and guide surfaces 21 are provided at both ends of the inner hole in the axial direction, such as... Figure 3 As shown.

[0039] The cylinder block 1 has a notch 9 on its side corresponding to the gear 8 to avoid misalignment of the gear 8. The firing pin 7 is located on one side of the cylinder block 1, and the notch 9 is located on the other side of the cylinder block 1. Figure 4 and Figure 5 As shown.

[0040] The specific implementation process is as follows: When the drive is in operation, the power of the motor is transmitted to the transmission shaft 3 through the output end of the reduction gearbox 5. The transmission shaft 3 drives the gear plate 8 to rotate counterclockwise. When the last cylindrical pin on the gear plate 8 disengages from the toothed impact pin 7, the piston 10 and the impact pin 7 are squeezed by a certain pressure gas inside the housing. The piston 10 drives the impact pin 7 to strike out in the driving direction, driving the fastener into objects such as wood, steel plate, and cement.

[0041] During the above process, the gear disk 8 rotates continuously under the drive of the transmission shaft 3. The missing tooth part of the gear disk 8 avoids the toothed part of the firing pin 7 until the piston 10 stops at the lowest end. The first cylindrical pin on the gear disk 8 meshes with the first tooth of the firing pin 7, pushing the firing pin 74 and the piston 10 back to the starting position and waiting for another firing.

[0042] When the tooth of the gear 8 gets stuck, the cylindrical pin of the gear 8 will interfere with the tooth on the impact pin 7, and the gear 8 will wobble. After a notch 9 is set on the cylinder seat 1, the wobbled gear 8 will wobble into the notch 9. The notch 9 is used to avoid the wobbled gear 8, thereby avoiding the problem of damage to the gear 8 after wobble.

[0043] Example 2

[0044] The difference from Embodiment 1 is that in this embodiment, the connecting parts at both ends of the drive shaft 3 are both support sleeves 4, such as... Figure 6 As shown.

[0045] Example 3

[0046] The difference from Embodiments 1 and 2 is that a grease storage section 22 is provided on the inner side of the support sleeve 4. The grease storage section 22 is located in the middle of the inner side of the support sleeve 4, and the grease storage section 22 is an annular groove, such as... Figure 7 As shown. In other embodiments, the grease storage section 22 may also be located at other positions within the support sleeve 4.

[0047] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A fastener driving tool, comprising a toothed firing pin, a firing mechanism for firing the toothed firing pin, and a lifting and releasing mechanism for lifting the firing pin, wherein the firing mechanism includes a cylinder seat, and the lifting and releasing mechanism includes a geared disc for lifting the firing pin, a drive shaft for driving the geared disc to rotate, and a reduction gearbox for driving the drive shaft; one end of the drive shaft is located inside the cylinder seat, and the other end of the drive shaft is connected to the output end of the reduction gearbox; characterized in that: The drive shaft is provided with connectors at both ends, and each connector includes at least one support sleeve.

2. The fastener driving tool according to claim 1, characterized in that: The inner side of the support sleeve is provided with a grease storage compartment.

3. The fastener driving tool according to claim 2, characterized in that: The grease storage section is a groove located inside the support sleeve.

4. The fastener driving tool according to claim 3, characterized in that: The groove is located in the middle of the support sleeve.

5. The fastener driving tool according to claim 4, characterized in that: The groove is an annular groove provided on the inner side of the support sleeve.

6. The fastener driving tool according to claim 5, characterized in that: The support sleeve includes an inner hole that matches the drive shaft, and guide surfaces are provided at both ends of the inner hole in the axial direction.

7. The fastener driving tool according to any one of claims 1-6, characterized in that: The gear plate is located inside the cylinder seat, and the side of the cylinder seat has a notch corresponding to the gear plate to avoid the gear plate from wobbling.

8. The fastener driving tool according to claim 7, characterized in that: The firing pin is located on one side of the cylinder seat, and the notch is located on the other side of the cylinder seat.

9. The fastener driving tool according to claim 8, characterized in that: The output end of the gearbox is splined to the drive shaft.

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