Power tool, one-handed saw

Abstract

The application discloses a kind of electric tools, single hand saw, comprising: shell, including main shell part and handle, the main shell part is equipped with motor, the handle is along first straight line arrangement;Cutting device, along second straight line arrangement, one end of the cutting device is drivingly connected to the main shell part, the cutting device works under the drive of the motor;The cutting device is composed of guide plate and the saw chain arranged around the guide plate;Battery combination part, along third straight line from the main shell part extends and is arranged below the handle, and the battery combination part is used to connect battery pack.The electric tool of the application is suitable for single hand holding, and the use feeling of single hand holding is better, while having smaller volume and weight, it has higher output power, and can cut most objects by hand in general use.

Description

TECHNICAL FIELD

[0001] The present application relates to a power tool, in particular to a one-handed saw. BACKGROUND

[0002] Large power tools are often more suitable for professional work processes, or when the size of the object to be processed is large. With the development of the economy, the demand for power tools by individuals and families has increased, and the requirements for work operations are increasingly fine, which has also increased the demand for small and medium-sized power tools. SUMMARY

[0003] To solve the problems of the prior art, the purpose of the present application is to provide a power tool, a one-handed saw, which is compact in structure, high in power, safe in use, and good in hand feeling.

[0004] In order to achieve the above-mentioned goal, the present application adopts the following technical solutions:

[0005] A one-handed saw, comprising: a housing comprising a main housing part and a handle, the main housing part being provided with a motor, the handle being arranged along a first straight line; a cutting device arranged along a second straight line, one end of the cutting device being drivingly connected to the main housing part, the cutting device being operated under the drive of the motor; the cutting device being composed of a guide plate and a saw chain arranged around the guide plate; a battery combination part extending from the main housing part and arranged below the handle, the battery combination part being used for connecting a battery pack.

[0006] In some embodiments, the main housing part comprises a motor part and a center part arranged at the output end of the motor part, the motor part being formed with a cavity accommodating the motor, the center part being connected to the battery combination part.

[0007] In some embodiments, the handle comprises a first end and a second end, the first end being connected to the main housing part, the second end being provided below with a battery pack; the second end being connected to the center part through the battery combination part.

[0008] In some embodiments, the intersection of a third straight line and the second straight line is located in the center part, and the intersection of the first straight line and the third straight line is located in the motor part.

[0009] In some embodiments, the third straight line is parallel to or intersects the second straight line, and when it intersects, the intersection is located behind the main housing part.

[0010] In some embodiments, the center of gravity of the one-handed saw is located in the handle and does not exceed the rear end of the handle.

[0011] In some embodiments, the ratio of the maximum output power of the motor to the weight of the power tool is less than or equal to 800w / kg and greater than or equal to 320w / kg.

[0012] In some embodiments, the ratio of the maximum output power of the motor to the volume of the power tool is less than or equal to 10w / cm 3 , greater than or equal to 0.5w / cm 3 .

[0013] In some embodiments, the second straight line and the first straight line have a first intersection point, the third straight line and the first straight line have a second intersection point, the distance between the first intersection point and the second intersection point is greater than 0 and less than or equal to 80% of the height of the power tool.

[0014] In some embodiments, further comprising a circuit board, a first accommodating space is formed in the battery combination part, and the circuit board is arranged in the first accommodating space.

[0015] In some embodiments, the battery pack at least comprises a lower end surface parallel to the working horizontal plane, and the height of the lower end surface in the up-down direction is less than or equal to the height of the lower edge of the center part in the up-down direction.

[0016] A power tool comprises: a housing comprising a main housing part and a handle, the main housing part being provided with a motor, and the handle being arranged along a first straight line; a cutting device arranged along a second straight line, one end of the cutting device being drivingly connected to the main housing part, and the cutting device being operated under the drive of the motor; the cutting device being composed of a guide plate and a saw chain arranged around the guide plate; and a battery combination part, the main housing part extending below the handle, and the battery combination part being used for connecting a battery pack; the power tool having a total weight M of less than or equal to 2.5kg when the battery pack is not connected.

[0017] The power tool of the present application is suitable for single-handed holding, and the single-handed holding has a good use feeling, and the power tool has a small volume and weight and a high output power, and can cut most objects by single hand in general use. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application;

[0019] Figure 2 is a front view of the structure of the present application;

[0020] Figure 3 is a top view of the structure of the present application;

[0021] Figure 4 is Figure 3 a sectional view of plane A-A in FIG. 1;

[0022] Figure 5 is Figure 1 a partial enlarged schematic view of structure B in FIG. 1;

[0023] Figure 6 is a bottom view of the structure of the present application. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] As shown in Figures 1-4 , the electric tool 10 of the present embodiment is a hand-held chain saw, and in particular, a chain saw suitable for single-handed holding. As shown in Figures 1 to 5 , the electric tool 10 comprises a housing 20, the housing 20 comprising a main housing portion, the main housing portion comprising a motor portion 21 and a central portion 22 disposed below the motor portion 21, the housing 20 further comprising a handle 23 and a battery coupling portion 24.

[0026] In order to facilitate the description of the technical solutions of the present application, the up, down, front, back, left and right as indicated by the arrows in Figure 1 are defined. The up, down, left, right, front and back in the present embodiment are all taken as examples of the state of the electric tool 10 in Figure 1 .

[0027] The motor portion 21 is formed with a first accommodating cavity, and a motor 50 is disposed in the first accommodating cavity along a third straight line 103. The motor 50 drives the cutting device 30 to work through a transmission device. The cutting device 30 is disposed along a second straight line 102, and the cutting device 30 is composed of a guide plate and a saw chain disposed around the guide plate. The central portion 22 is formed with a second accommodating cavity, and the transmission device and part of the cutting device 30 are disposed in the second accommodating cavity, so that most of the cutting device 30 extends out of the central portion 22 to perform cutting work.

[0028] The third straight line 103 and the second straight line 102 intersect at a first intersection point N1, and the first intersection point N1 is located in the central portion. That is, the motor portion 22 and the cutting device 30 extend along the third straight line 103 and the second straight line 102, respectively, from the first intersection point N1 of the central portion. The third straight line 103 and the second straight line 102 form an included angle R2, and 90°≤R2≤160°, preferably 110°≤R2≤150°, so that the center of gravity is closer to the rear handle, and does not hinder the work of the cutting device.

[0029] The handle 23 is arranged along a first straight line 101, and includes a first end and a second end, the first end is connected to the motor part 21, and the second end 23 is provided with the battery pack 40. The first straight line and the third straight line intersect at a second intersection point N2, and the second straight line and the third straight line intersect at a third intersection point N3. The second intersection point N2 is located in the motor part 21, and the third intersection point N3 is located at the rear of the main housing part. In other embodiments, the first straight line 101 can also be parallel to or out of the plane of the second straight line 102, which is not limited here. The second straight line 102 and the first straight line 101 form an included angle R3, 0°≤R3≤90°, preferably 10°≤R3≤60°. When the second straight line 102 and the first straight line 101 form an included angle R3 of 0° or 90°, the handle 23 can be a right angle, having two edges respectively at 0° and 90° to the first straight line 101.

[0030] The above angle combination of R2 and R3 can make the center of gravity of the electric tool 10 located in the handle part 23, especially close to the user's grip at the knuckles, has the optimal use feeling, long-term holding is not tired, no matter the user's arm is in the normal state of holding the handle 23 or the arm is in the state of holding the handle 23, it has a better use feeling.

[0031] The height of the second intersection point N2 in the up-down direction is higher than that of the first intersection point N1, the straight line distance between the first intersection point N1 and the second intersection point N2 is greater than 0 and less than or equal to 80% of the height of the whole machine, preferably, the straight line distance between the first intersection point N1 and the second intersection point N2 is greater than 0 and less than or equal to 40% of the height of the whole machine. Since the target object using the chain saw type electric tool is generally lower than the shoulder of the human body, and even the target object is lower than the elbow, most cases do not need to hold the electric tool high for operation, for small and medium-sized chain saws, the above structure combined with the position of the battery pack makes the center of gravity located in the handle part or below the handle, when holding the electric tool 10, the hand has less compression feeling, which improves the use feeling.

[0032] The first straight line 101 and the third straight line 103 are located in the same plane, and the second straight line 102 is parallel or approximately parallel to the plane where the first straight line 101 and the third straight line 103 are located. Further, the first straight line 101, the second straight line 102 and the third straight line 103 are located in the same plane. It ensures the parallelism of the user cutting the target object and the balance of the electric tool. In other embodiments, the third straight line 103 can be perpendicular to the plane where the first straight line 101 is located or intersected out of the plane of the first straight line 101, etc.

[0033] The transmission rotates around a fourth straight line 104, and transmits the driving force to the saw chain 31. The fourth straight line 104 is perpendicular to the plane in which the cutting device is located, i.e. approximately perpendicular to the second straight line 102 or the third straight line 103. Specifically, the fourth straight line 104 passes through the first intersection point N1, or has an extremely small straight line distance from the first intersection point N1, i.e. the first intersection point N1 is located at the center of rotation of the transmission.

[0034] The power tool 10 has a total weight M without the battery pack 40, and when M≤2.5kg, the power tool can be considered as a single-handed operation. In the embodiment, the motor 50 is a brushless motor, and the maximum continuous output power is P. The ratio of the maximum output power P of the motor to the weight M of the power tool is less than or equal to 800w / kg, and greater than or equal to 320w / kg, and preferably the ratio of P to M is less than or equal to 580w / kg, and greater than or equal to 350w / kg. The power tool 10 has a weight M' without the battery pack 40 and the cutting device 30, and the ratio of the maximum output power P of the motor to the weight M' of the power tool is less than or equal to 900w / kg, and greater than or equal to 350w / kg, and preferably the ratio of P to M' is less than or equal to 650w / kg, and greater than or equal to 400w / kg. The power tool 10 also has a volume V excluding the cutting device 30 and the battery pack 40, and the ratio of the maximum output power P of the motor to the volume V of the power tool is less than or equal to 10w / cm 3 , and greater than or equal to 0.5w / cm 3 , and preferably the ratio of P to M is less than or equal to 6w / cm 3 , and greater than or equal to 1w / cm 3 . The power tool has a small volume and weight, and a high output power, and can cut most objects with a single hand in general use.

[0035] The battery connecting portion 24 extends from the main housing portion and is arranged below the handle 23. The battery connecting portion 24 extends rearward of the main housing portion along a first direction. In the present embodiment, the first direction is substantially parallel to the second straight line 102. In the present embodiment, the second end of the handle 23 is connected to the central portion 22 via the battery connecting portion 24, and the battery pack 40 is connected to the battery connecting portion 22. In other embodiments, the second end of the handle 23 can not be connected to the battery connecting portion. Specifically, the battery pack 40 is detachably connected to the battery connecting portion 24. The battery connecting portion 24 has a third accommodating cavity arranged forward of the battery pack and an accommodating slot for connecting the battery pack 40. The battery pack 40 is mounted to the accommodating slot of the battery connecting portion 24 along a mounting plane 401. In the present embodiment, the mounting plane 401 is parallel to the working horizontal plane, so that the power tool 10 can be placed on any plane according to the lower surface of the battery pack 40. The working horizontal plane is a plane perpendicular to the up-down direction. The mounting plane 401 is substantially parallel to the second straight line 102, or the mounting plane 401 forms an angle with the second straight line 102, and the intersection point of the angle is located forward of the power tool. The angle is less than or equal to 15°. The above structure can enable the power tool to be stably placed on a certain plane, and the cutting device will not damage the plane. The projection of the battery pack 40 on the working horizontal plane is at least partially located rearward of the projection of the handle on the plane. In other embodiments, the angle between the mounting plane 401 and the second straight line 102 can be greater than 15°. In this case, the battery pack 40 is mostly located rearward of the handle 23, or the battery pack is mounted in other ways, as long as the battery pack has at least one end surface parallel to the horizontal plane, and the end surface faces downward of the power tool.

[0036] In the present embodiment, the central portion 22 further has a pinion 221, and the lower portion of the central portion 22 has a mounting portion 222 for mounting one end of the pinion 221. The pinion 221 has a sharp tooth structure on one side, and this side faces the cutting device 30 and partially extends out of the central portion 22 and partially locates in the central portion 22. The tooth structure of the pinion 221 is used for cutting workpieces, so as to ensure smooth downward cutting of the power tool. The two ends of the pinion 221 are connected to the connecting mechanism in the housing of the central portion 22, and the lower end of the pinion 221 is connected to the mounting portion 222. The mounting portion 222 is a downwardly protruding housing, and the lower end surface of the mounting portion 222 is parallel to the lower end surface of the battery pack 40. Alternatively, the lower end surface of the mounting portion 222 is slightly higher than the lower end surface of the battery pack 40 in the up-down direction, so that the angle between the connecting line of the two end surfaces and the working horizontal plane is less than 6°, so as to ensure that the cutting device 30 will not touch the working surface when the power tool 10 is placed.

[0037] In other embodiments, the circuit board 60 can also be arranged at the lowermost end of the central portion 22. In this case, the battery connecting portion 24 is only used for connecting the battery pack, so as to further reduce the length of the power tool 10 in the front-rear direction and the handle 23, and also make the lower end surface of the battery pack and the lower end surface of the central portion more close in height.

[0038] The third accommodating cavity is provided with a circuit board 60 for receiving or outputting signals to the motor, switch assembly and other structures. The battery combination part 24 is provided with an air inlet 241 near the circuit board 60, which can be arranged on the upper part of the battery combination part 24 or on the lower part of the battery combination part 24. An installation groove 242 for installing the battery pack 40 is arranged behind the air inlet 241, and the installation groove 242 is directed to the rear of the power tool 10, so that the battery pack 40 is inserted from the rear of the battery combination part 24.

[0039] A fan is arranged behind the motor 50 and rotates coaxially with the motor 50. In other embodiments, the fan can not be arranged additionally, and a fan provided with the motor can be used, or the fan can be arranged between the motor 50 and the transmission device to improve the heat dissipation effect. The motor part 21 is provided with an air outlet 211, and the airflow enters from the air inlet 241 below, passes through the circuit board 60 and the motor 50, and then flows out from the air outlet 211 of the motor part 21.

[0040] As shown in Figure 5 In this embodiment, the air outlet 211 is arranged on the side of the motor part, and at least one air outlet 211 is arranged. In this embodiment, one air outlet 211 is arranged on each of the left and right sides of the motor part 21. One side of the air outlet 211 is provided with a wind guide platform 211a, which is arranged in the front part of the air outlet 211. The wind guide platform 211a is an outwardly convex inclined surface, which is inclined in the direction of the principle cutting tool 30, and guides the air outlet airflow to the rear of the power tool 10, preventing the airflow from causing the cutting debris to fly. The housing at the air outlet 211 also forms an inclined surface 211c, which is inclined in the same direction as the wind guide platform 211a. The air outlet 211 is also provided with a partition plate 211b, which divides the air outlet 211 into a plurality of small holes, thereby increasing the safety when increasing the area of the air outlet 211.

[0041] As shown in Figure 6 In this embodiment, the air inlet 241 is arranged in a region, covering the bottom surface and part of the side surface of the third accommodating cavity. The housing of the battery combination part 24 in the region of the air inlet 241 is in a grid structure comprising a plurality of through holes. The air inlet 241 comprises a plurality of grids 241a, which are arranged obliquely so that the airflow enters from the rear of the air inlet 241. The two ends of the grid 241a are inclined upward, so that the region of the air inlet 241 extends to the side of the battery combination part.

[0042] The upper end of the motor portion 21 is concave to form a first holding groove 212. The front and rear ends of the first holding groove 212 are convex, and the left and right ends of the first holding groove 212 are open to communicate with the external space. The electric tool of the embodiment is mainly used for single-handed holding, but in some special cases (e.g., insufficient strength of the user, transverse use of the tool, or more stable cutting), an auxiliary holding part is usually needed in addition to the main holding part for the user to hold and exert force with the second hand. In general large electric tools, a dedicated secondary handle is provided, but in the small and medium-sized electric tools involved in the present application, the provision of a secondary handle often occupies a large space, and the weight is not large, most of the use conditions are suitable for single-handed operation, and the provision of a secondary handle is bound to be upside down, increasing the manufacturing cost, occupying space and weight, etc. The first holding groove 212 in the embodiment can be used for auxiliary holding in special situations, the palm of the user holds the side wall of the motor portion 21, and the thumb is placed in the first holding groove 212, which has a good holding feeling.

[0043] The center portion 22 is provided with a stop portion 25 protruding along a fifth straight line 105, the stop portion 25 being in front of the motor portion 21 and having a space with the motor portion 21. The fifth straight line 105 is inclined relative to the up-down direction to move away from the cutting device. That is, the fifth straight line 105 and the second straight line 102 form an angle R1, R1>90°. The stop portion 25, the upper surface of the center portion 22 and the side wall of the motor portion 21 form a second holding groove 26. The palm side of the user is located in the second holding groove 26, or holds the second holding groove 26 in other ways. The stop portion 25 is used to block the further downward sliding of the auxiliary holding hand, prevent the palm from sliding down and being injured by the cutting device in some cases, and improve the safety of the tool.

[0044] The shell 20 includes a shield 27, which is arranged above the cutting device 30, connected with the shell of the center portion 22, and rotates around a sixth straight line 106. Specifically, the length of the shield 27 in the front-rear direction is less than or equal to one half of the length of the cutting device 30 extending from the center portion 22. The shield 27 is pivoted in the center portion 22, or directly pivoted in the stop portion 25, rotates relative to the center portion 22, and is internally provided with a reset spring for resetting when the shield 27 is lifted.

[0045] The handle 23 also includes a switch assembly, which is arranged below the handle. Specifically, the switch assembly is arranged at the intersection of the handle 23 and the motor portion 21. The mechanical structure of the switch assembly is arranged in the handle 23, and the related connection lines are connected to the circuit board along the handle 23 and the battery combination portion 24.

[0046] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A single-hand chain saw, characterized in that, The single-hand chain saw comprises: a housing comprising a main housing part and a handle, the main housing part being provided with a motor, the handle being arranged along a first straight line; a cutting device arranged along a second straight line, one end of the cutting device being drivingly connected to the main housing part, the cutting device being driven by the motor to work; the cutting device being composed of a guide plate and a saw chain arranged around the guide plate; a battery combining part extending from the main housing part and arranged below the handle, the battery combining part being used to connect a battery pack; the main housing part comprising a motor part accommodating the motor and a center part arranged below the motor part and connected to the battery combining part, the motor being arranged along a third straight line, an intersection point of the third straight line and the first straight line being located in the motor part; the single-hand chain saw having a total weight M when the battery pack is not connected, the total weight M being less than or equal to 2.5 kg; the third straight line and the second straight line forming an included angle R2, 90°≤R2≤160°, the second straight line and the first straight line forming an included angle R3, 0°≤R3≤90°.

2. The single-hand chainsaw of claim 1, wherein, the handle comprising a first end and a second end, the first end being connected to the main housing part, the second end being provided with the battery pack below, the second end being connected to the center part through the battery combining part.

3. The single-hand chainsaw of claim 1, wherein, the intersection point of the third straight line and the second straight line being located in the center part.

4. The single-hand chainsaw of claim 1, wherein, the motor being arranged along a third straight line, the third straight line being parallel to the second straight line or intersecting with the second straight line, the intersection point being located behind the main housing part when the third straight line intersects with the second straight line.

5. The single-hand chainsaw of claim 1, wherein, the center of gravity of the single-hand chain saw being located in the handle and not exceeding the rear end of the handle.

6. The single-hand chainsaw of claim 1, wherein, the ratio of the maximum output power of the motor to the weight of the single-hand chain saw being less than or equal to 800 w / kg and greater than or equal to 320 w / kg.

7. The single-hand chainsaw of claim 1, wherein, The ratio of the maximum output power of the electric motor to the volume of the single-hand chainsaw is less than or equal to 10 w / cm 3 , greater than or equal to 0.5 w / cm 3 .

8. The single-hand chainsaw of claim 1, wherein, the second straight line and the first straight line having a first intersection point, the third straight line and the first straight line having a second intersection point, the distance between the first intersection point and the second intersection point being greater than 0 and less than or equal to 80% of the height of the single-hand chain saw.

9. The single-hand chainsaw of claim 1, wherein, further comprising a circuit board, a first accommodating space being formed in the battery combining part, the circuit board being arranged in the first accommodating space.

10. The single-hand chainsaw of claim 1, wherein, the battery pack comprising at least one lower end surface parallel to the working horizontal plane, the height of the lower end surface in the up-down direction being less than or equal to the height of the lower edge of the center part in the up-down direction.

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