Power tool

Abstract

The present application relates to a kind of electric tools.The electric tool includes housing assembly, blade assembly, power supply assembly, motor located in the inside of housing assembly and screw rod assembly connected with the motor and the blade assembly, the housing assembly includes trigger assembly, the electric tool further includes dustproof assembly and safety switch, the housing assembly and the blade assembly fit place has notch, the dustproof assembly is located at the notch, to close the notch during the use of the blade assembly;The safety switch is connected with the trigger assembly, and the safety switch has the first position of locking the trigger assembly and the second position of unlocking the trigger assembly.The electric tool of the present application can ensure the smoothness of blade assembly shearing action, while having good dustproof and dirt resistance and use safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of garden tools, in particular to an electric tool with simple operation. BACKGROUND

[0002] In the pruning of garden fruit trees, the powerful and comfortable lithium battery scissors have gradually replaced the traditional large manual scissors, greatly improving the work efficiency and quality, and the work intensity of the user is also multiplied. In some working environments, there are more dust particles, in which case the failure rate of the lithium battery scissors is very high. After the dust particles enter the internal transmission structure of the lithium battery scissors, the performance and service life of the scissors will be greatly reduced, and direct failure may occur. Therefore, the dustproof structure during work is particularly important in lithium battery scissors.

[0003] The lithium battery scissors are generally fully wrapped, and two blades are exposed from the machine body. Under the driving of the lithium battery, the cutting is realized. The cutter part is mainly assembled by fixed knives, moving knives and machine shells. Since the blade is a moving part, fine wood residues and sludge on the bark will be brought into the machine shell by the blade during the cutting process. The dust in the environment will also enter the internal transmission system of the scissors through the pores of the machine shell and the blade. Whether it is a lead screw or a gear structure, it needs a good lubricating environment during transmission. If the dirt enters the transmission system or contaminates the lubricating grease, the lead screw slide rail will be stuck due to the dirt, and the user or maintenance point needs to frequently disassemble the machine to remove the dirt and clean the parts. There are many cases of complete machine failure. The existing dustproof structure of the scissors has unsatisfactory dustproof effect.

[0004] At the same time, the electric scissors are often designed with a trigger. When the trigger is pulled, the blade is closed. When the trigger is released, the blade is opened, making the cutting of fruit tree branches very simple. However, due to the exposure of the blade and its high risk, the safety regulations require that the electric scissors and other tools need to be started with double actions, that is, a safety switch structure needs to be added to the existing scissors. In the working process of the lithium battery scissors, the blade needs to be frequently opened and closed to realize a large amount of cutting work. If the double-action start is required for each cutting, the user experience will be greatly reduced.

[0005] Therefore, it is necessary to improve the existing electric tool structure to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide an electric tool which can ensure smooth cutting action of the blade assembly while having good dustproof and dirtproof and use safety.

[0007] To achieve the above object, the present application provides an electric tool, which comprises a casing assembly, a blade assembly, a power supply assembly, a motor located inside the casing assembly, and a screw rod assembly connecting the motor and the blade assembly, the casing assembly comprising a trigger assembly, the electric tool further comprising a dustproof assembly and a safety switch, the casing assembly having a gap at the joint with the blade assembly, the dustproof assembly being located at the gap to seal the gap during use of the blade assembly, and the safety switch being connected with the trigger assembly and having a first position to lock the trigger assembly and a second position to unlock the trigger assembly.

[0008] As a further improvement of the present application, the blade assembly comprises a moving blade and a fixed blade connected with each other in a scissors shape, and the fixed blade is fixedly connected with the casing assembly.

[0009] As a further improvement of the present application, the dustproof assembly comprises a first dustproof member arranged at the gap and corresponding to the fixed blade, and a second dustproof member accommodated in the casing assembly, the first dustproof member being in contact with the moving blade and capable of sealing the gap during closing of the blade assembly.

[0010] As a further improvement of the present application, the first dustproof member has an arc-shaped wall, the shape of the arc-shaped wall being consistent with the movement track of the moving blade.

[0011] As a further improvement of the present application, the casing assembly comprises a first casing located beside the blade assembly, the first dustproof member being located between the first casing and the blade assembly, the first casing having an inner wall surface facing the blade assembly, and the second dustproof member being arranged at the inner wall surface.

[0012] As a further improvement of the present application, the second dustproof member is a porous elastic member, and the second dustproof member is capable of sealing the gap during opening of the blade assembly.

[0013] As a further improvement of the present application, the electric tool has a longitudinal axis extending along the length direction of the electric tool body, and the second dustproof member is located behind the first dustproof member along the longitudinal axis and away from the moving blade.

[0014] As a further improvement of the present application, the safety switch is arranged through the casing assembly and connected with the trigger assembly, and comprises a pressing part, a contact part in contact with the trigger assembly at the first position, and a reset member for switching the pressing part and the contact part between the first position and the second position.

[0015] As a further improvement of the present application, the contact portion is movable with the pressing portion and acts on the reset member when the pressing portion rotates from the first position to the second position, so that the contact portion is out of contact with the trigger assembly.

[0016] As a further improvement of the present application, the safety switch further comprises a connecting portion between the pressing portion and the contact portion, and the reset member is arranged on the connecting portion to keep the safety switch in the first position after the external force is removed.

[0017] The electric tool of the present application has the beneficial technical effects that: the electric tool of the present application is provided with the dustproof assembly, so that the electric tool of the present application can ensure smooth shearing action of the blade assembly while avoiding the debris generated by shearing or impurities such as dust in the running process from entering the casing assembly through the gap between the casing assembly and the moving blade, thereby affecting the normal use of the electric tool; at the same time, the safety switch cooperating with the trigger assembly is provided, which effectively improves the use safety of the electric tool, and the structure is simple and convenient to operate, thereby effectively improving the use experience of the electric tool. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of the electric tool of the present application.

[0019] Figure 2 is Figure 1 a perspective exploded view of

[0020] Figure 3 is Figure 1 a partial perspective exploded view of the first dustproof member and the second dustproof member.

[0021] Figure 4 is Figure 1 a partial perspective exploded view of the safety switch. DETAILED DESCRIPTION

[0022] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0023] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application and its applications or uses.

[0024] Techniques and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification.

[0025] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0026] It should be noted that like numerals and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0027] Referring to Figure 1 and Figure 2 , an electric tool 100 of the present application is shown, which comprises a housing assembly 1, a blade assembly 2 arranged at the front end of the housing assembly, a power supply assembly 3 arranged at the rear end of the housing assembly 1, a lead screw assembly 4 arranged inside the housing assembly 1, a transmission assembly 5, a speed reduction unit 6, a motor 7, and a trigger assembly 8 arranged at the lower part of the whole machine; wherein the lead screw assembly 4 is connected with the output end of the speed reduction unit 6 through the transmission assembly 5, the input end of the speed reduction unit 6 is connected with the output end of the motor 7, and the motor 7 is electrically connected with the power supply assembly 3. The power supply assembly 3 is used to supply power for the electric tool 100, in the present application, the power supply assembly 3 is a power supply wire which can be plugged with the driving motor 21, and the power supply assembly 3 is connected with an external battery end or a power supply end. In other embodiments, the power supply assembly 3 can be a battery pack assembly, which comprises one or more battery packs and a receiving cavity for accommodating the battery packs, wherein the plurality of battery packs can be combined in series and parallel in any combination, and the battery packs can be installed in the receiving cavity in a non-detachable manner or in a detachable manner.

[0028] The housing assembly 1 comprises a first housing 11 located at the front end near the working area, a second housing 12 and a third housing 13 for holding. The first housing 11 is used to connect and fix the trigger assembly 8, and the second housing 12 and the third housing 13 are snap-fitted and arranged at opposite sides to form a receiving space for accommodating the blade assembly 2, the power supply assembly 3, the lead screw assembly 4, the transmission assembly 5, the speed reduction unit 6, and the motor 7, and the outer surfaces of the second housing 12 and the third housing 13 form a handle to facilitate the user to hold and complete the corresponding garden work tasks.

[0029] Referring to Figure 2As shown, the internal part of the electric tool 100 is provided with a first metal bracket 14 and a second metal bracket 15. The first metal bracket 14 and the second metal bracket 15 are magnesium alloy thin-wall brackets. The first metal bracket 14 and the second metal bracket 15 are two half structures, the outer stator of the motor 7 is positioned in the two half first metal bracket 14 and the second metal bracket 15, the rotor of the motor 7 is positioned in the first metal bracket 14 and the second metal bracket 15 through a bearing, the front end of the motor 7 is provided with a pinion, and the pinion is connected with the speed reduction part 6. The bottom bearing seat of the lead screw assembly 4 is also positioned in the first metal bracket 14 and the second metal bracket 15. The first metal bracket 14 and the second metal bracket 15 are locked by screws; the entire transmission structure is precise in circumferential and axial dimensions, so that the diameter of the holding area of the scissors is very small and comfortable for the user to hold.

[0030] In a preferred embodiment of the present application, the first metal bracket 14 and the second metal bracket 15 serve as positioning parts of multiple components, and the inner cavity is processed by fine milling, which can ensure the overall concentricity of the front and rear bearings of the motor 7 and the bottom seat of the lead screw assembly 4, so that the transmission efficiency is higher and the machine works without noise.

[0031] The blade assembly 2 includes a movable blade 21 and a fixed blade 22 connected in the shape of scissors, the movable blade 21 is connected with the lead screw assembly 4, the fixed blade 22 is fixedly connected with the shell assembly 1, further, the trigger assembly 8 is drivingly connected with the movable blade 21 for controlling the cutting movement of the movable blade 21; in a preferred embodiment of the present application, a Hall magnet is arranged on the trigger assembly 8, and the Hall magnet generates Hall induction when the trigger assembly 8 is pulled, at this time the movable blade 21 is driven by the connecting rod in the lead screw assembly 4; to form a circumferential reciprocating motion on the fixed blade 22, and finally complete the corresponding cutting task.

[0032] Please refer to Figure 3 As shown, the movable blade 21 in the blade assembly 2 is continuously switched between the open and closed states under the drive of the motor 7, and the second shell 12 and the third shell 13 are provided with a gap (not numbered) at the abutting position of the second shell 12, the third shell 13 and the movable blade 21 to ensure the smooth opening and closing of the movable blade 21. Specifically, the gap is usually formed at the abutting position of the second shell 12, the third shell 13 and the movable blade 21, and during the operation of the electric tool 100, dirt such as wood chips and sludge often enters the inside of the shell assembly 1 through the gap, so that the electric tool 100 cannot be continuously used after being operated for a period of time under the influence of the dirt, which greatly reduces the service life of the electric tool 100.

[0033] In order to prevent dirt and the like from entering the interior of the housing assembly 1 through the gap along with the movement of the blade assembly 2 during the use of the power tool 100, the power tool 100 in the present application further comprises a dustproof assembly 9 arranged between the blade assembly 2 and the housing assembly 1. Specifically, the dustproof assembly 9 comprises a first dustproof member 91 arranged at the position of the gap and corresponding to the fixed blade 22, and a second dustproof member 92 accommodated in the housing assembly 1.

[0034] In the present application, the first dustproof member 91 is located between the first housing 11 and the blade assembly 2, and the first dustproof member 91 is arranged in close contact with the moving blade 21. In a preferred embodiment of the present application, the first dustproof member 91 has an arc-shaped wall 911, and the shape of the arc-shaped wall 911 is substantially consistent with the movement trajectory of the moving blade 21. In this way, the first dustproof member 91 can deform to close the gap during the closing process of the shearing of the blade assembly 2, thereby preventing dirt from entering the housing assembly 1, and further return to the original shape during the opening process of the shearing of the blade assembly 2, thereby closing the gap again to prevent the entry of dirt. Preferably, the first dustproof member 91 is a dustproof member made of dustproof rubber. Of course, in other embodiments of the present application, the first dustproof member 91 can also be made of other materials to have elasticity and prevent the entry of dirt.

[0035] The second dustproof member 92 is arranged on the inner wall surface of the first housing 1 facing the blade assembly 2. In fact, the first dustproof member 91 can generally block larger particles such as wood chips and stones, but dust with smaller particle size can still enter the housing assembly 1 through the gap between the first dustproof member 91 and the housing assembly 1 and / or the blade assembly 2. The arrangement of the second dustproof assembly 92 can effectively prevent dust with smaller particle size from entering the housing assembly.

[0036] Specifically, the power tool 100 has a longitudinal axis extending along the length direction of the power tool 100, and the second dustproof member 92 is located behind the first dustproof member 91 along the longitudinal axis and is arranged away from the moving blade 21. The size of the second dustproof member 92 is greater than that of the first dustproof member 91, and the second dustproof member 92 can close the gap during the opening process of the shearing of the blade assembly 2, thereby further filtering the air entering the interior of the housing assembly 1 through the gap, effectively improving the dustproof effect of the dustproof assembly 9, further increasing the working life of the power tool 100, and reducing the failure of the power tool 100 caused by the entry of dirt. In a preferred embodiment of the present application, the second dustproof member 92 is a porous elastic member, and preferably, the second dustproof member 92 is a dustproof member made of dustproof sponge. In this way, the assembly of the second dustproof member 92 can be facilitated.

[0037] The end of the electric power tool 100 close to the working area is defined as the front end, and the end close to the holding area opposite to the front end is defined as the rear end. When the electric power tool 100 of the present application is used, the debris or other dirt generated by the working of the electric power tool 100 is firstly filtered by the first dustproof member 91 to filter out the dirt with larger particle size, and the remaining particles / dust with smaller particle size will be blocked by the second dustproof member 92, thereby effectively avoiding the influence of the debris or other dirt on the use effect and service life of the electric power tool 100.

[0038] Further, the electric power tool 100 is further provided with a safety switch 10 corresponding to the trigger assembly 8. The safety switch 10 comprises a pressing part 101, a contact part 102 integrally arranged with the pressing part 101, a reset member 103 for controlling the rotation position switching of the pressing part 101 and the contact part 102, and a connecting part 104 for connecting the safety switch 10 to the casing assembly 1, and the reset member 103 is sleeved on the connecting part 104, so that the safety switch 10 can be reset to rotate and be connected to the casing assembly 1.

[0039] Please refer to Figure 4 and combine Figure 1 It is shown that the safety switch 10 is arranged on the first casing 11, and the first casing 11 has a mounting part 111. In the present embodiment, the mounting part 111 is arranged in a hollow frame structure, and the trigger assembly 8 is located in the frame structure. The safety switch 10 is mounted on the first casing 11 through the connecting part 104 and partially penetrates the mounting part 111, so that the pressing part 101 is partially located outside the mounting part 111, and the contact part 102 extends into the mounting part 111 and can abut against the trigger assembly 8.

[0040] The position of the trigger assembly 8 when the electric power tool 100 is in a non-working state is defined as the initial position, and the position of the trigger assembly 8 when the electric power tool 100 is in a working state is defined as the working position. In the present application, the safety switch 10 has a first position for locking the trigger assembly 8 to remain in the initial position and a second position for unlocking the trigger assembly 8 so that the trigger assembly 8 can be moved to the working position. When the pressing part 101 rotates from the first position to the second position, the direction is the pressing direction. When the trigger assembly 8 is in the initial position, the safety switch 10 is in the first position, and the contact part 102 abuts against the tail end of the trigger assembly 8 in the extension direction, so that the trigger assembly 8 remains in the first position.

[0041] When the user presses the pressing part 101 in the pressing direction, the pressing part 101 compresses the reset member 103, so that the safety switch 10 rotates from the first position to the second position in the pressing direction, and the contact part 103 is separated from the tail end of the trigger assembly 8. At this time, the user can complete the control of the electric power tool 100 by pressing the trigger assembly 8, and then complete the corresponding garden work task.

[0042] In the present application, the safety switch 10 is arranged at the handle position of the electric tool 100 and close to the mounting portion 111, when the user holds the electric tool 100 for working, the user's hand will be close to the mounting portion 111 to hold the electric tool 100 because the user needs to press the trigger assembly 8, at this time, the user can directly press the safety switch 101 to be close to the handle of the shell assembly 1, at this time, the trigger assembly 8 can be pressed smoothly, and because the user's palm will hold the handle during use, the safety switch 10 will also be pressed for a long time, therefore, only a single trigger of the trigger assembly 8 is needed for each cutting, which is very convenient to operate, and in a preferred embodiment of the present application, the outer surface of the first shell 11 is further provided with a groove (not numbered) for accommodating the pressing portion 101, in this way, when the user presses the pressing portion 101, the pressing portion 101 can be accommodated in the groove, so as to effectively improve the use comfort of the user when using the electric tool 100.

[0043] When the garden work task is finished, the trigger assembly 8 and the pressing portion 101 are released, the contact portion 102 rotates back to the first position in the reverse direction of the pressing direction under the action of the reset member 103, and abuts against the tail end of the trigger assembly 8 again, so as to lock the trigger assembly 8 in the initial position, preventing the electric tool 100 from being triggered again, thereby effectively improving the use safety of the electric tool 100.

[0044] In summary, the electric tool of the present application can ensure smooth shearing action of the blade assembly, avoid the debris generated by shearing or impurities such as dust in the running process from entering the shell assembly through the gap between the shell assembly and the moving blade, and affect the normal use of the electric tool, through the setting of the dustproof assembly; at the same time, the use safety of the electric tool is effectively improved through the setting of the safety switch cooperating with the trigger assembly, and the structure is simple and convenient to operate, thereby effectively improving the use experience of the electric tool.

[0045] It should be noted that, unless otherwise defined, all technical and scientific terms used herein are the same as those commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0046] The technical features of the above-described embodiments can be combined in any manner, and in order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0047] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A power tool comprising a housing assembly, a blade assembly, a power supply assembly, a motor located inside the housing assembly, and a lead screw assembly drivingly connecting the motor and the blade assembly, the housing assembly including a trigger assembly, characterized in that: The power tool also includes a dustproof component and a safety switch. The housing assembly has a notch at the contact point with the blade assembly, and the dustproof component is located at the notch to seal the notch during use of the blade assembly. The safety switch is connected to the trigger assembly and has a first position for locking the trigger assembly and a second position for unlocking the trigger assembly. The blade assembly includes a movable blade and a fixed blade connected to each other in a scissor-like shape; The dustproof assembly includes a first dustproof component disposed at the notch position and corresponding to the fixed blade, and a second dustproof component housed within the housing assembly. The first dustproof component is in contact with the moving blade, and the first dustproof component can close the notch during the closing process of the blade assembly shearing, while the second dustproof component can close the notch during the opening process of the blade assembly shearing.

2. The power tool according to claim 1, characterized in that: The fixed blade is fixedly connected to the housing assembly.

3. The power tool according to claim 1, characterized in that: The first dustproof component has an arc-shaped wall, the shape of which conforms to the movement trajectory of the moving blade.

4. The power tool according to claim 1, characterized in that: The housing assembly includes a first housing located beside the blade assembly, a first dustproof component located between the first housing and the blade assembly, the first housing having an inner wall surface facing the blade assembly, and a second dustproof component provided on the inner wall surface.

5. The power tool according to claim 1, characterized in that: The second dustproof component is a porous elastic component.

6. The power tool according to claim 1, characterized in that: The power tool has a longitudinal axis extending along the length of the power tool body, and the second dustproof component is located behind the first dustproof component and away from the moving blade along the longitudinal axis.

7. The power tool according to claim 1, characterized in that: The safety switch passes through the housing assembly and is connected to the trigger assembly, and includes a pressing part, a contact part that contacts the trigger assembly in the first position, and a reset member that controls the pressing part and the contact part to switch between the first position and the second position.

8. The power tool according to claim 7, characterized in that: When the pressing part rotates from the first position to the second position, the contact part moves with the pressing part and acts on the reset member, so that the contact part disengages from the trigger assembly.

9. The power tool according to claim 7, characterized in that: The safety switch further includes a connecting portion located between the pressing portion and the contact portion, and the reset member is provided on the connecting portion so that the safety switch remains in the first position after the external force is removed.

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