Electric tool

Abstract

The utility model provides an electric tool which comprises a machine shell, a brake handle, a first brake piece, a second brake piece and a contact piece, and the brake handle is rotationally arranged on the machine shell around a rotating axis; the first brake piece is arranged on the brake handle; the second brake piece is arranged on the machine shell and can move in the direction of the rotating axis of the brake handle relative to the first brake piece. At least part of the contact piece protrudes out of the surface, close to the second brake piece, of the machine shell, the protruding part makes contact with the second brake piece, and the strength of the contact piece is larger than that of the machine shell. According to the electric tool, the contact piece corresponding to the second brake piece is arranged on the machine shell, the contact piece makes contact with the second brake piece arranged on the machine shell, the contact piece with the strength larger than that of the machine shell is used for bearing extrusion of the second brake piece, damage of the second brake piece to the machine shell is avoided, and the service life of the machine shell is prolonged. And the contact friction with the second brake piece is reduced, so that the reliability of brake work is improved.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0002] Existing power tools such as chainsaws are equipped with a braking mechanism, which typically includes a brake lever and two brake pads. The brake lever is rotatably mounted on the power tool's housing, allowing the user to brake the tool by turning it. The two brake pads are mounted on the brake lever and the housing, respectively. After braking, the two brake pads move closer together and press against each other to keep the brake lever stationary. The housing is usually an injection-molded part. When the brake pads are mounted on the housing, they come into contact with the housing, causing it to deform under pressure, which can lead to poor braking. Utility Model Content

[0003] The purpose of this utility model is to provide a power tool that solves the problem that the brake pads of existing power tools can compress the housing, causing the housing to deform.

[0004] To solve the above-mentioned technical problems, the present invention provides an electric tool, comprising:

[0005] chassis;

[0006] A brake lever is rotatably mounted on the housing about a rotation axis and has a braking position and a starting position.

[0007] A first braking component is disposed on the brake handle, and a limiting part is provided on the first braking component;

[0008] The second brake component is disposed on the housing. The second brake component is movable relative to the first brake component between a first position and a second position along the rotation axis of the brake handle. The second brake component is provided with a mating part.

[0009] Specifically, when the brake lever is in the braking position, the second brake component is in the first position, and the mating part and the limiting part form a limiting fit in the rotation direction of the brake lever to restrict the rotation of the brake lever; when the brake lever is in the starting position, the second brake component is in the second position, and the limiting fit between the mating part and the limiting part in the rotation direction of the brake lever is released to allow the brake lever to rotate.

[0010] The power tool further includes a contact member disposed on the housing, at least a portion of the contact member protruding from the surface of the housing near the second brake member, and the protruding portion contacting the second brake member, the contact member having a strength greater than the strength of the housing.

[0011] Preferably, the housing is provided with a mounting groove, the second brake component is located in the mounting groove, and at least a portion of the contact component extends into the mounting groove and abuts against the second brake component.

[0012] Preferably, a receiving groove is formed on the inner surface of the groove sidewall of the mounting groove. The receiving groove penetrates the groove sidewall of the mounting groove in a direction away from the bottom wall of the mounting groove to form an insertion port. The contact member is inserted into the receiving groove from the insertion port, and a portion of the contact member extends into the mounting groove from the groove opening of the receiving groove to abut against the second brake member.

[0013] Preferably, one end of the contact member away from the sidewall of the mounting groove extends from the insertion port out of the receiving groove.

[0014] Preferably, the contact element is a metal pin.

[0015] Preferably, a plurality of contact elements are provided at intervals along the circumference of the second brake element.

[0016] Preferably, the contact element is arranged around the second brake element.

[0017] Preferably, the second brake member has a plurality of contact elements spaced apart on both sides of the second brake member in the width direction along the length direction of the second brake member.

[0018] Preferably, a support shaft protrudes from the housing, one end of the support shaft is connected to the brake handle, and the first brake component and the second brake component are sleeved on the support shaft;

[0019] The power tool also includes a spring, which is sleeved on the support shaft and located on the side of the second brake member away from the first brake member. The two ends of the spring abut against the second brake member and the housing, respectively.

[0020] Preferably, the first brake component has a first protrusion on its surface near the second brake component, and the limiting part is the first protrusion; the second brake component has a second protrusion on its surface near the first brake component, and the mating part is the second protrusion.

[0021] When the second brake component is in the first position, the first boss abuts against one side of the second boss in the rotation direction of the brake lever; when the second brake component is in the second position, the first boss abuts against one side of the second boss in the direction of the rotation axis of the brake lever.

[0022] Preferably, the power tool further includes:

[0023] A drive mechanism, which is disposed on the housing;

[0024] A transmission mechanism is mounted on the housing and connected to the drive mechanism to drive the transmission mechanism to operate.

[0025] A braking mechanism is provided, which is connected to the transmission mechanism and the brake handle, so as to brake the transmission mechanism by driving the braking mechanism through the brake handle.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The power tool of this invention has a contact element on the housing corresponding to the second brake component. The contact element contacts the second brake component on the housing. In this way, the contact element, which is stronger than the housing, bears the pressure of the second brake component. This not only avoids damage to the housing caused by the second brake component, but also reduces contact friction with the second brake component, thereby improving the reliability of the braking operation. Attached Figure Description

[0028] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0029] Figure 1 This is a schematic diagram of the structure of the power tool in the embodiment of this utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of the cooperation between the intermediate braking mechanism and the braking mechanism;

[0031] Figure 3 for Figure 2 Sectional view of AA;

[0032] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0033] Figure 5 for Figure 2 Exploded view of the braking mechanism;

[0034] Figure 6 for Figure 2 A schematic diagram of the middle braking mechanism after the brake handle has been removed;

[0035] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0036] Figure 8 for Figure 2 A schematic diagram of the structure where the contact parts are located on the middle casing;

[0037] Figure 9 for Figure 8 A magnified view of a section at point C.

[0038] Explanation of reference numerals in the accompanying drawings of this utility model:

[0039] Power tool 1000, brake mechanism 100, housing 1, mounting groove 11, receiving groove 12, insertion port 13, brake handle 2, first brake component 3, limiting part 31, first boss 31a, first plane 32, second brake component 4, mating part 41, second boss 41a, second plane 42, contact component 5, support shaft 6, spring 7, washer 8, first snap ring 9a, second snap ring 9b, transmission mechanism 200, braking mechanism 300, drive mechanism 400, working accessory 500.

[0040] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0044] This utility model provides a power tool, which can be a chainsaw or other power tool with a brake. The following description will use an electric chainsaw as an example. Figures 1 to 9 A preferred embodiment of the power tool provided by this utility model is shown.

[0045] Please see Figures 3 to 5 In this embodiment, the power tool 1000 includes a housing 1, a brake handle 2, a first brake element 3, a second brake element 4, and a contact element 5 disposed on the housing 1. The brake handle 2 is rotatably disposed on the housing 1 about a rotation axis and has a braking position and a starting position. The first brake element 3 is disposed on the brake handle 2 and has a limiting part 31. The second brake element 4 is disposed on the housing 1 and is movable relative to the first brake element 3 between a first position and a second position along the rotation axis of the brake handle 2. The second brake element 4 has a mating part 41. In the process, when the brake lever 2 is in the braking position, the second brake element 4 is in the first position, and the mating part 41 and the limiting part 31 form a limiting fit in the rotation direction of the brake lever 2 to restrict the rotation of the brake lever 2; when the brake lever 2 is in the starting position, the second brake element 4 is in the second position, and the limiting fit between the mating part 41 and the limiting part 31 in the rotation direction of the brake lever 2 is released to allow the brake lever 2 to rotate; at least a portion of the contact element 5 protrudes from the surface of the housing 1 near the second brake element 4, and the protruding portion contacts the second brake element 4, and the strength of the contact element 5 is greater than the strength of the housing 1.

[0046] Specifically, the brake handle 2, the first brake element 3, the second brake element 4, and at least a portion of the housing 1 constitute the brake mechanism 100. The power tool 1000 can trigger and release the brake through the brake mechanism 100. The brake handle 2 is rotatably mounted on the housing 1. Within the rotational stroke of the brake handle 2 relative to the housing 1, the brake handle 2 has a braking position and an activation position. When the user rotates the brake handle 2 to the braking position, the power tool 1000 can be braked; when the brake handle 2 is rotated to the activation position, the power tool 1000 can be released from the brake.

[0047] The first brake element 3 and the second brake element 4 are disposed between the housing 1 and the brake lever 2. The first brake element 3 and the second brake element 4 are opposite each other in the direction of the rotation axis of the brake lever 2. Hereinafter, the direction of the rotation axis of the brake lever 2 is defined as up and down. The side of the first brake element 3 closer to the second brake element 4 is the lower side of the first brake element 3, and the side of the second brake element 4 closer to the first brake element 3 is the upper side of the second brake element 4. The specific shape and style of the first brake element 3 and the second brake element 4 are not particularly limited. For example, the first brake element 3 and the second brake element 4 are usually arranged in a plate shape, that is, the first brake element 3 and the second brake element 4 are both brake pads.

[0048] The first brake element 3 is mounted on the brake handle 2, which allows the brake handle 2 to drive the first brake element 3 to rotate along an upward axis. The second brake element 4 is mounted on the housing 1, and the second brake element 4 and the housing 1 are fixed relative to each other in the rotation direction of the brake handle 2, thus allowing the first brake element 3 to rotate relative to the second brake element 4.

[0049] The second brake component 4 can be vertically movable relative to the first brake component 3. Specifically, the second brake component 4 can be vertically movable and mounted on the housing 1, while the first brake component 3 is fixedly mounted on the brake lever 2; alternatively, the second brake component 4 can be fixedly mounted on the housing 1, while the first brake component 3 can be vertically movable and mounted on the brake lever 2. The following description will use the example of the second brake component 4 being vertically movable and mounted on the housing 1, while the first brake component 3 is fixedly mounted on the brake lever 2.

[0050] The first brake element 3 and the second brake element 4 are respectively provided with a limiting part 31 and a mating part 41. During the stroke of the second brake element 4 relative to the first brake element 3, the second brake element 4 has a first position and a second position. When the brake handle 2 is in the braking position, the second brake element 4 is in the first position. The second brake element 4 and the first brake element 3 form a limiting fit in the rotation direction of the brake handle 2 through the mating part 41 and the limiting part 31, thereby restricting the rotation of the brake handle 2 in the braking position, so that the brake handle 2 remains stationary in the braking position after the power tool 1000 brakes. When the brake of the power tool 1000 is released, the user rotates the brake handle 2 in the braking position toward the starting position. The brake handle 2 or the first brake element 3 can drive the second brake element 4 in the first position to move downward to the second position. After the brake handle 2 is rotated to the starting position, the second brake element 4 moves to the second position. At this time, the limiting fit between the second brake element 4 and the first brake element 3 in the rotation direction of the brake handle 2 is released, and the brake handle 2 in the starting position can rotate normally.

[0051] A contact element 5 is provided on the housing 1 corresponding to the second brake element 4. The first brake element 3, the second brake element 4, and the contact element 5 are usually located inside the housing 1. The following description will take the case where the first brake element 3, the second brake element 4, and the contact element 5 are located inside the housing 1 as an example. The strength of the material of the contact element 5 is greater than that of the material of the housing 1. For example, the material of the housing 1 is usually plastic, while the material of the contact element 5 can be metal, etc. The contact element 5 is located on the periphery of the second brake element 4. At least a portion of the contact element 5 protrudes towards the second brake element 4 from the inner surface of the housing 1. During the up-and-down movement of the second brake element 4, the outer periphery of the second brake element 4 will contact the portion of the contact element 5 protruding from the inner surface of the housing 1, but will not contact the inner surface of the housing 1. This not only avoids damage to the housing 1 caused by the second brake element 4, but also reduces the contact friction with the second brake element 4 by having the contact element 5 contact the outer periphery of the second brake element 4, compared to contacting the outer periphery of the second brake element 4 through the inner surface of the housing 1.

[0052] The power tool 1000 of this utility model has a contact member 5 on the housing 1 corresponding to the second brake member 4. The contact member 5 contacts the second brake member 4 on the housing 1. In this way, the contact member 5, which is stronger than the housing 1, can withstand the compression of the second brake member 4. This not only avoids damage to the housing 1 caused by the second brake member 4, but also reduces the contact friction with the second brake member 4, thereby improving the reliability of the braking operation.

[0053] Optionally, please refer to Figure 5 , Figure 7 and Figure 9 In this embodiment, the contact member 5 is arranged around the second brake member 4.

[0054] Specifically, the contact element 5 is arranged around the periphery of the second brake element 4, that is, the contact element 5 is arranged along the circumference of the second brake element 4, so as to better avoid the outer periphery of the second brake element 4 from contacting the inner surface of the housing 1.

[0055] The specific implementation of the contact element 5 being arranged circumferentially along the second brake element 4 can be that the contact element 5 is arranged in a ring extending circumferentially along the second brake element 4; or multiple contact elements 5 can be arranged at intervals along the circumferential direction of the second brake element 4. Optionally, please refer to Figure 5 , Figure 7 and Figure 9 In this embodiment, multiple contact members 5 are provided at intervals along the circumference of the second brake member 4.

[0056] Specifically, by having multiple spaced contact elements 5 contact the second brake element 4, it is beneficial to reduce contact friction with the second brake element 4 and extend its service life. The following will illustrate this with an example where multiple contact elements 5 are spaced apart along the circumference of the second brake element 4.

[0057] Optionally, please refer to Figure 7 and Figure 9 In this embodiment, the second brake member 4 has multiple contact members 5 spaced apart on both sides of the second brake member 4 in the width direction along the length direction of the second brake member 4.

[0058] Specifically, the second brake element 4 is typically elongated, having two opposing arc-shaped edges along its length and two opposing straight edges along its width. The two straight edges extend along the length of the second brake element 4. A plurality of contact elements 5 are provided corresponding to each straight edge of the second brake element 4, abutting against the straight edge. For example, four contact elements 5 are provided, with each straight edge of the second brake element 4 abutting against two contact elements 5 spaced apart along its length.

[0059] The specific shape and style of the contact element 5 can be set according to the actual situation. For example, the contact element 5 can be columnar, block-shaped, disc-shaped, or strip-shaped. The cross-sectional shape of the contact element 5 can be circular, elliptical, triangular, square, or trapezoidal. Optionally, please refer to... Figure 5 , Figure 7 and Figure 9 In this embodiment, the contact element 5 is a metal pin. Metal pins have the advantages of high hardness and a smooth surface. The metal pin is cylindrical, resulting in low friction with the second brake element 4. Utilizing the metal pin to withstand the pressure from the second brake element 4 improves the reliability of the braking operation. The following description uses a metal pin as an example for the contact element 5.

[0060] The housing 1 typically has a mounting groove 11, within which the second brake component 4 is located. The shape of the second brake component 4 is usually adapted to the shape of the mounting groove 11. This allows the mounting groove 11 not only to position the second brake component 4 on the housing 1 but also to limit its circumferential movement. Optionally, please refer to... Figures 6 to 9 In this embodiment, the housing 1 is provided with a mounting groove 11, the second brake component 4 is located in the mounting groove 11, and at least a portion of the contact component 5 extends into the mounting groove 11 and abuts against the second brake component 4.

[0061] Specifically, a mounting groove 11 is provided on the inner surface of the housing 1. The size of the mounting groove 11 is slightly larger than the size of the second brake member 4, so that at least a portion of the contact member 5 extends into the mounting groove 11, and the portion of the contact member 5 near the second brake member 4 abuts against the outer periphery of the second brake member 4.

[0062] Contact element 5 can be disposed on the bottom wall or side wall of the mounting groove 11. Optionally, please refer to [reference needed]. Figure 7 and Figure 9 In this embodiment, a receiving groove 12 is provided on the inner surface of the groove sidewall of the mounting groove 11. The receiving groove 12 penetrates the groove sidewall of the mounting groove 11 in a direction away from the bottom wall of the mounting groove 11 to form an insertion port 13. The contact member 5 is inserted into the receiving groove 12 from the insertion port 13. A part of the contact member 5 extends into the mounting groove 11 from the groove opening of the receiving groove 12 and abuts against the second brake member 4.

[0063] Specifically, the inner peripheral wall of the receiving groove 12 is provided with a plurality of receiving grooves 12 extending vertically. The opening of the receiving groove 12 is located on the inner surface of the groove side wall of the mounting groove 11. The upper end of the receiving groove 12 extends upward through the inner surface of the housing 1, thereby forming an insertion port 13 on the inner surface of the housing 1. The shape of the contact member 5 is usually adapted to the shape of the receiving groove 12. The lower end of the contact member 5 can be inserted downward into the receiving groove 12 from the insertion port 13, and a part of the contact member 5 extends into the mounting groove 11 from the opening of the receiving groove 12. In this way, the receiving groove 12 is provided on the inner peripheral wall of the mounting groove 11 so that the contact member 5 is embedded in the inner peripheral wall of the mounting groove 11 through the receiving groove 12. The receiving groove 12 allows a part of the contact member 5 to be exposed. The exposed part of the contact member 5 slides in contact with the second brake member 4, avoiding direct contact between the housing 1 and the second brake member 4. This solves the problem of poor braking caused by the second brake member 4 squeezing the housing 1 when it moves, resulting in deformation of the housing 1.

[0064] The upper end of the contact member 5 can be located inside the receiving groove 12, that is, the length of the contact member 5 is less than or equal to the length of the receiving groove 12; alternatively, the upper end of the contact member 5 can be located outside the receiving groove 12, that is, the length of the contact member 5 is greater than the length of the receiving groove 12. Alternatively, please refer to... Figure 7 and Figure 9 In this embodiment, one end of the contact member 5 away from the groove sidewall of the mounting groove 11 extends from the insertion port 13 to the outside of the receiving groove 12.

[0065] Specifically, the length of the contact 5 is greater than the length of the receiving groove 12, so that the upper end of the contact 5 protrudes upward from the inner surface of the housing 1, thereby facilitating the installation and removal of the contact 5.

[0066] Optionally, please refer to Figure 4 and Figure 5 In this embodiment, a support shaft 6 is protruding on the housing 1. One end of the support shaft 6 is connected to the brake handle 2. The first brake component 3 and the second brake component 4 are sleeved on the support shaft 6. The power tool 1000 also includes a spring 7. The spring 7 is sleeved on the support shaft 6 and is located on the side of the second brake component 4 away from the first brake component 3. The two ends of the spring 7 abut against the second brake component 4 and the housing 1, respectively.

[0067] Specifically, a support shaft 6 extending vertically is protruding upwards from the inner surface of the housing 1. The upper end of the support shaft 6 is rotatably connected to the brake handle 2, allowing the brake handle 2 to rotate around the support shaft 6. A first brake component 3, a second brake component 4, and a spring 7 are sequentially fitted onto the support shaft 6 from top to bottom. The spring 7 serves to move and reset the second brake component 4.

[0068] Optionally, please refer to Figure 4 , Figure 5 and Figure 7 In this embodiment, a first retaining ring 9a and a second retaining ring 9b are sleeved on the support shaft 6. The first retaining ring 9a abuts against the upper side of the second brake component 4, and the second retaining ring 9b abuts against the upper side of the brake handle 2. Thus, the first retaining ring 9a can limit the movement of the second brake component 4 in the vertical and upward directions, and similarly, the second retaining ring 9b can limit the movement of the brake handle 2 in the vertical and upward directions.

[0069] Optionally, please refer to Figure 4 , Figure 5 and Figure 7 In this embodiment, a washer 8 is sleeved on the support shaft 6, and the washer 8 abuts against the lower side of the spring 7.

[0070] Optionally, please refer to Figure 4 , Figure 5 and Figure 7 In this embodiment, a first boss 31a is provided on the surface of the first brake member 3 near the second brake member 4, and the limiting part 31 is the first boss 31a. A second boss 41a is provided on the surface of the second brake member 4 near the first brake member 3, and the mating part 41 is the second boss 41a. When the second brake member 4 is in the first position, the first boss 31a abuts against the second boss 41a on one side of the brake handle 2 in the rotation direction. When the second brake member 4 is in the second position, the first boss 31a abuts against the second boss 41a on one side of the brake handle 2 in the direction of the rotation axis.

[0071] Specifically, a first boss 31a is provided on the lower surface of the first brake component 3, forming a limiting part 31. The area of ​​the lower surface of the first brake component 3 other than the first boss 31a is a first plane 32. A second boss 41a is provided on the upper surface of the second brake component 4, forming a mating part 41. The area of ​​the upper surface of the second brake component 4 other than the second boss 41a is a second plane 42.

[0072] When the brake lever 2 is in the start position, the second brake member 4 is in the second position, and the second protrusion 41a on the second brake member 4 abuts against the first protrusion 31a on the first brake member 3, and the spring 7 is compressed. When the brake lever 2 in the start position is rotated toward the brake position, the brake lever 2 drives the first brake member 3 to rotate together, so that the first protrusion 31a on the first brake member 3 and the second protrusion 41a on the second brake member 4 gradually shift away from each other in the rotation direction of the brake lever 2. When the brake lever 2 is rotated to the brake position, the first protrusion 31a on the first brake member 3 and the second protrusion 41a on the second brake member 4 are completely shifted away from each other. The second brake member 4 in the second position can automatically move upward to the first position under the action of the spring 7. At this time, the second protrusion 41a is located on one side of the first protrusion 31a in the rotation direction of the brake lever 2, and the second protrusion 41a abuts against the first plane 32, and the first protrusion 31a abuts against the second plane 42, so as to restrict the brake lever 2 in the brake position from rotating toward the start position.

[0073] When the power tool 1000 is released from its brake, the user rotates the brake handle 2, which is in the brake position, toward the start position. The brake handle 2 drives the first brake component 3 to rotate together. Through the abutment of the first boss 31a and the second boss 41a, the first brake component 3 drives the second brake component 4, which is in the first position, to move downward to the second position, so that the second brake component 4 compresses the spring 7 downward.

[0074] Optionally, please refer to Figures 1 to 3 In this embodiment, the power tool 1000 further includes a transmission mechanism 200, a braking mechanism 300, and a drive mechanism 400. The drive mechanism 400 is disposed on the housing 1. The transmission mechanism 200 is disposed on the housing 1 and is connected to the drive mechanism 400 so as to drive the transmission mechanism 200 to operate. The braking mechanism 300 is connected to the transmission mechanism 200 and the brake handle 2 so as to brake the transmission mechanism 200 by driving the braking mechanism 300 through the brake handle 2.

[0075] Specifically, the transmission mechanism 200 and the drive mechanism 400 are usually housed inside the housing 1. The transmission mechanism 200 is connected to the drive mechanism 400 and the working accessory 500. Thus, when the drive mechanism 400 is energized, the drive mechanism 400 can drive the transmission mechanism 200 to move, so as to drive the working accessory 500 to perform operations through the transmission mechanism 200.

[0076] The braking mechanism 300 is connected to the transmission mechanism 200 and the brake handle 2. When the brake handle 2 is rotated to the braking position, the brake handle 2 can trigger the braking mechanism 300 to stop the transmission mechanism 200. When the brake handle 2 is rotated to the starting position, the braking mechanism 300 releases the restriction on the transmission mechanism 200.

[0077] The specific configuration of the braking mechanism 300 can be set according to the actual situation. For example, in this embodiment, the transmission mechanism 200 includes a sprocket, and the braking mechanism 300 includes a brake band. The brake band surrounds the outer periphery of the sprocket and is connected to the brake handle 2. When the brake handle 2 is rotated to the braking position, the brake handle 2 can pull the brake band on the sprocket, so that the brake band is tightened to brake the sprocket, thereby realizing the braking of the power tool 1000.

[0078] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A power tool (1000), comprising: Casing (1); The brake handle (2) is rotatably mounted on the housing (1) about a rotation axis and has a braking position and a starting position; A first brake component (3) is disposed on the brake handle (2), and a limiting part (31) is provided on the first brake component (3); The second brake component (4) is disposed on the housing (1). The second brake component (4) is movable relative to the first brake component (3) between a first position and a second position along the rotation axis of the brake handle (2). The second brake component (4) is provided with a mating part (41). When the brake lever (2) is in the braking position, the second brake member (4) is in the first position, and the mating part (41) and the limiting part (31) form a limiting fit in the rotation direction of the brake lever (2) to restrict the rotation of the brake lever (2); when the brake lever (2) is in the starting position, the second brake member (4) is in the second position, and the limiting fit between the mating part (41) and the limiting part (31) in the rotation direction of the brake lever (2) is released to allow the brake lever (2) to rotate. The power tool (1000) is characterized in that it further includes a contact member (5) disposed on the housing (1), at least a portion of the contact member (5) protruding from the surface of the housing (1) near the second brake member (4) and the protruding portion contacting the second brake member (4), and the strength of the contact member (5) being greater than the strength of the housing (1).

2. The power tool (1000) as described in claim 1, characterized in that, The housing (1) is provided with a mounting groove (11), the second brake component (4) is located in the mounting groove (11), and at least a portion of the contact component (5) extends into the mounting groove (11) and abuts against the second brake component (4).

3. The power tool (1000) as described in claim 2, characterized in that, A receiving groove (12) is provided on the inner surface of the groove sidewall of the mounting groove (11). The receiving groove (12) penetrates the groove sidewall of the mounting groove (11) in a direction away from the bottom wall of the mounting groove (11) to form an insertion port (13). The contact member (5) is inserted into the receiving groove (12) from the insertion port (13). A part of the contact member (5) extends into the mounting groove (11) from the groove opening of the receiving groove (12) and abuts against the second brake member (4).

4. The power tool (1000) as described in claim 3, characterized in that, One end of the contact (5) away from the groove sidewall of the mounting groove (11) extends from the insertion port (13) to the outside of the receiving groove (12).

5. The power tool (1000) as claimed in claim 1, characterized in that, The contact element (5) is a metal pin.

6. The power tool (1000) as claimed in claim 1, characterized in that, The contact members (5) are provided in multiple circumferentially spaced along the second brake member (4).

7. The power tool (1000) as claimed in claim 6, characterized in that, The second brake member (4) has a plurality of contact members (5) spaced apart on both sides of the second brake member (4) in the width direction along the length direction of the second brake member (4).

8. The power tool (1000) as claimed in claim 1, characterized in that, The housing (1) is provided with a support shaft (6), one end of the support shaft (6) is connected to the brake handle (2), and the first brake component (3) and the second brake component (4) are sleeved on the support shaft (6); The power tool (1000) also includes a spring (7), which is sleeved on the support shaft (6) and located on the side of the second brake (4) away from the first brake (3). The two ends of the spring (7) abut against the second brake (4) and the housing (1), respectively.

9. The power tool (1000) as claimed in claim 1, characterized in that, The first brake component (3) has a first boss (31a) protruding on its surface near the second brake component (4), and the limiting part (31) is the first boss (31a). The second brake component (4) has a second boss (41a) protruding on its surface near the first brake component (3), and the mating part (41) is the second boss (41a). When the second brake member (4) is in the first position, the first boss (31a) abuts against the second boss (41a) on one side in the rotation direction of the brake handle (2); when the second brake member (4) is in the second position, the first boss (31a) abuts against the second boss (41a) on one side in the direction of the rotation axis of the brake handle (2).

10. The power tool (1000) as claimed in claim 1, characterized in that, The power tool (1000) also includes: A drive mechanism (400) is disposed on the housing (1); A transmission mechanism (200) is disposed on the housing (1) and is connected to the drive mechanism (400) to drive the transmission mechanism (200) to operate. A braking mechanism (300) is connected to the transmission mechanism (200) and the brake handle (2) so as to brake the transmission mechanism (200) by driving the braking mechanism (300) through the brake handle (2).

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