Power Tools

Abstract

The present invention discloses an electric tool, comprising a casing, a motor located in the casing and a switch assembly for controlling the start and stop of the motor, wherein the switch assembly comprises a push knob arranged outside the casing, a switch accommodated in the casing and a connecting rod connecting the push knob and the switch, wherein the push knob pushes the connecting rod to start and stop the switch, the push knob is arranged on the outside of the motor, a receiving cavity is arranged between the casing and the motor, the connecting rod is accommodated in the receiving cavity, and the switch is arranged on the rear side of the motor; a fulcrum is arranged between the two ends of the connecting rod, and when the push knob moves in a plane perpendicular to the axis of the motor, the connecting rod rotates around the fulcrum and pushes the switch to start and stop, which is conducive to the miniaturization of the electric tool.

Description

[Technical field]

[0001] The invention relates to an electric tool, in particular to a cutting or grinding electric tool. [Background technology]

[0002] Traditional cutting or grinding power tools use grinding discs to grind or polish workpieces. For example, an angle grinder has a main housing arranged in the front-to-back direction and a grinding disc arranged vertically below the main housing. A push knob sliding in the front-to-back direction is provided on the outer periphery of the main housing. The push knob is pushed to turn on the switch, and then the motor is powered on and drives the grinding disc to rotate.

[0003] Please refer to the Chinese invention patent publication No. CN104924279A of Makita Company, which discloses an electric tool, in which a brushless motor and a switch located at the rear side of the brushless motor are housed in the main housing of the electric tool, a push-twist is set on the outside of the main housing to slide along the front-to-back direction, a connecting rod and the push-twist are connected to each other, and the connecting rod slides forward and backward along the inner surface of the main housing, and when the push-twist slides backward, it drives the connecting rod to move backward together and close the switch, thereby stopping driving the brushless motor. The sliding route of the push-twist is set in the same direction as the motor axis in the housing, and the push-twist and the connecting rod need to move forward and backward along the length direction of the housing, resulting in the switch in the patent having to be pulled a certain distance away from the brushless motor to allow the rear end of the connecting rod to obtain sufficient moving distance to squeeze the switch, resulting in an increase in the length of the housing.

[0004] Therefore, it is necessary to design a new electric tool to solve the above problems. [Summary of the invention]

[0005] In order to solve the above problems, the present invention provides an electric tool which is easy to operate and small in size.

[0006] In order to solve the above technical problems, the present invention adopts the following technical scheme: it includes a casing, a motor located in the casing and a switch assembly for controlling the start and stop of the motor, the switch assembly includes a push knob arranged on the outside of the casing, a switch accommodated in the casing and a connecting rod connecting the push knob and the switch, the push knob pushes the connecting rod to start and stop the switch, the push knob is arranged relative to the outside of the motor, a accommodating cavity is arranged between the casing and the motor, the connecting rod is accommodated in the accommodating cavity, and the switch is arranged on the rear side of the motor; a fulcrum is arranged between the two ends of the connecting rod, and when the push knob moves in a plane perpendicular to the axis of the motor, the connecting rod rotates around the fulcrum and pushes the switch to start and stop.

[0007] A further improvement scheme is: the casing has a first cylindrical portion for accommodating the motor and a second cylindrical portion for accommodating the switch, the diameter of the second cylindrical portion is smaller than that of the first cylindrical portion, the outer periphery of the first cylindrical portion of the casing is provided with a slide rail area extending perpendicular to the plane of the motor axis, the push knob is slidably installed on the slide rail area, the switch assembly also includes a spring, the inner side of the push knob is provided with a reset portion protruding toward the casing, a positioning portion is provided on the slide rail area, one end of the spring abuts against the reset portion and the other end is limited to the positioning portion.

[0008] A further improvement scheme is: a boss protruding along the surface is provided at one end of the slide rail area along the sliding direction of the push-twist, and a blocking portion is provided at the other end that is recessed downward from the surface of the slide rail area; a hook portion that is clamped with the blocking portion is provided on one side of the push-twist, and a limiting portion that abuts against the boss is provided on the other side, and the push-twist slides between the blocking portion and the boss.

[0009] A further improved solution is: when the switch stops, the spring presses the limiting portion of the push knob against the boss; when the switch starts, the push knob compresses the spring and the hook portion of the push knob is buckled on the blocking portion.

[0010] A further improvement is as follows: a battery pack is plugged into the rear end of the power tool, a movable pressing portion is provided on the switch, one end of the pressing portion is pivotally connected to the switch, and the other end swings up and down relative to the switch, one end of the connecting rod presses against the swinging end of the pressing portion, and when one end of the connecting rod presses the pressing portion and activates the switch, the battery pack supplies power to the motor.

[0011] A further improved solution is: the inner wall of the housing is provided with a support pin protruding inwardly, and the fulcrum of the connecting rod is sleeved on the support pin.

[0012] A further improved solution is: the push knob is provided with a linkage portion which penetrates the housing and extends to the inner cavity of the housing, the front end of the connecting rod is provided with a through slot, the linkage portion passes through the through slot and is buckled on the connecting rod.

[0013] A further improved solution is: a contact portion folded toward the center of the housing is provided at the rear end of the connecting rod, and the contact portion is connected to the switch.

[0014] A further improvement scheme is: the electric tool also includes a transmission mechanism installed in the casing, the motor includes a stator fixed in the casing and a rotor sleeved in the stator, the transmission mechanism includes a small bevel gear fixed to the front end of the rotor and an output component meshingly connected to the bottom of the small bevel gear and perpendicular to the rotor, the output component includes an output shaft supported in the casing and a large bevel gear fixed on the output shaft, and the small bevel gear is meshingly connected to the large bevel gear.

[0015] A further improvement scheme is: the casing includes a main casing, a head casing fixed to the front end of the main casing and a head casing cover fixed to the lower end of the head casing, the stator is supported in the main casing and arranged opposite to the push-twist, the front end of the rotor extends into the inner cavity of the head casing and is supported in the head casing, and the output shaft is respectively supported in the head casing cover and the head casing.

[0016] Compared with the prior art, the present invention has the following beneficial effects: by arranging a connecting rod in the accommodating cavity between the casing and the motor, and pivotally connecting the connecting rod to the casing through a fulcrum, the push-twist button fits the casing and slides in a plane perpendicular to the axis of the motor, so that the rotation direction of the push-twist button is consistent with the direction of hand holding, which is ergonomic and easy to operate; and the push-twist button drives the connecting rod to rotate around the fulcrum, and pushes the switch to start and stop, which saves the space for the traditional connecting rod to move forward and backward, shortens the overall length of the power tool, and is conducive to the miniaturization of the power tool.

Brief Description of the Drawings

[0017] Figure 1 is a three-dimensional view of the electric tool of the present invention;

[0018] Figure 2 yes Figure 1 A partial stereoscopic view of

[0019] Figure 3 yes Figure 1 A cross-sectional view of

[0020] Figure 4 yes Figure 3 A-direction sectional view;

[0021] Figure 5 yes Figure 2 A partial enlarged view of

[0022] Figure 6 yes Figure 4 A partial enlarged view of

[0023] Figure 7 It is a three-dimensional view of the push and twist of the electric tool of the present invention;

[0024] Figure 8 It is a three-dimensional view of the switch assembly of the electric tool of the present invention. [Specific implementation method]

[0025] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments, wherein the implementation of the electric tool is described in detail by taking an angle grinder as an example.

[0026] Please refer to Figures 1 to 8The figure shows an electric tool 100 of the present invention, which includes a housing 1, a motor 2 located in the housing 1, a transmission mechanism 3 driven by the motor 2, a saw blade connected to the end of the transmission mechanism, a switch component 4 for controlling the start and stop of the motor 2, and a battery pack 102 plugged into one end of the housing 1. When the switch component 4 is started, the battery pack 102 supplies power to the motor 2, and the motor 2 drives the saw blade 101 through the transmission mechanism 3 for output.

[0027] The motor 2 includes a stator 22 fixed in the housing 1 and a rotor 21 sleeved in the stator 22. The output direction of the motor 2 is defined as the front direction, and the direction perpendicular to the output direction of the motor 2 is defined as the up and down direction. The transmission mechanism 3 includes a small bevel gear 31 fixed at the front end of the rotor 21 and an output assembly 32 meshingly connected to the bottom of the small bevel gear 31 and perpendicular to the rotor 21. The output assembly 32 includes an output shaft 321 supported in the housing 1 and a large bevel gear 322 fixed on the output shaft 321. The small bevel gear 31 and the large bevel gear 322 are meshed and connected with each other. The housing 1 includes a main housing 11, a head housing 14 fixed at the front end of the main housing 11, and a head housing cover fixed at the lower end of the head housing 14. The stator 22 is supported in the main housing 11. The front end of the rotor 21 extends into the inner cavity of the head housing 14 and is supported in the head housing 14. The output shaft 321 is supported in the head housing cover and the head housing 14 respectively. The main housing 11 has a first barrel portion 11a for accommodating the motor 2 and a second barrel portion 11b for accommodating the switch 42. The diameter of the second barrel portion 11b is smaller than that of the first barrel portion 11a. Of course, the second barrel portion 11b includes a transition portion between the first barrel portion 11a and the second barrel portion 11b. In this embodiment, two barrel portions are provided to facilitate the operator to hold comfortably.

[0028] Please combine Figures 5 to 8 As shown, the switch assembly 4 includes a push button 41 arranged on the outside of the main housing 11, a spring 44 that pushes the push button 41, a switch 42 accommodated in the main housing 11, and a connecting rod 43 connecting the push button 41 and the switch 42. The push button 41 pushes the connecting rod 43 to start and stop the switch 42.

[0029] The push knob 41 is arranged on the outside of the first barrel portion 11a corresponding to the motor 2. The outer periphery of the first barrel portion 11a is provided with a slide rail area 13 extending perpendicular to the axis plane of the motor 2. The push knob 41 is slidably installed on the slide rail area 13. The inner side of the push knob 41 is provided with a reset portion 41d protruding toward the housing 1. The slide rail area 13 is provided with a positioning portion 13c extending along the sliding direction of the push knob 41. One end of the spring 44 abuts against the reset portion 41d and the other end is limited to the positioning portion 13c. The positioning portion 13c in this embodiment is upward and then to the side of the slide rail area 13. The spring 44 is sleeved on the positioning portion 13c. Of course, in other embodiments, it can also be a structure such as a slot to limit the spring. The slide rail area 13 is provided with a boss 13b protruding along the surface at one end along the sliding direction of the push knob 41, and a blocking portion 13a recessed downward from the surface of the slide rail area 13 is provided at the other end. A hook portion 41b is provided on one side of the push knob 41 to be clamped with the blocking portion 13a, and a limiting portion 41c is provided on the other side to be pressed against the boss 13b. The push knob 41 slides between the blocking portion 13a and the boss 13b. When the switch 42 stops, the spring 44 presses the limiting portion 41c of the push knob 41 against the boss 13b; when the switch 42 is started, the push knob 41 compresses the spring 44 and the hook portion 41b of the push knob 41 is buckled on the blocking portion 13a.

[0030] Please combine Figure 3 and Figure 8As shown, a receiving cavity is provided between the main housing 11 and the motor 2, and the connecting rod 43 is accommodated in the receiving cavity; the main housing 11 is provided with a through hole, and the push knob 41 is provided with a linkage portion 41a which passes through the through hole and extends to the inner cavity of the main housing 11, and the end of the linkage portion 41a has a limiting hook folded to the side, and the front end of the connecting rod 43 is provided with a through groove 43c, and the linkage portion 41a passes through the through groove 43c and is fastened to the connecting rod 43 by the limiting hook. The length of the connecting rod 43 far exceeds the maximum width of the through hole. Having the linkage portion 41a fastened to the connecting rod 43 is conducive to preventing the push knob 41 from falling off the outer shell of the main housing 11. The rear end of the connecting rod 43 is provided with a contact portion 43b folded toward the center direction of the housing 1. The switch 42 is installed at the rear of the motor 2, and a movable pressing portion 42a is provided on the switch 42. One end of the pressing portion 42a is pivotally connected to the switch 42, and the other end swings up and down relative to the switch 42. The contact portion 43b of the connecting rod 43 presses against the swinging end of the pressing portion 42a. A fulcrum 43a is provided between the two ends of the connecting rod 43. The inner wall of the main housing 11 is provided with a support pin 12 protruding toward the center of the main housing 11. The fulcrum 43a of the connecting rod 43 is a through hole sleeved on the support pin 12. The push knob 41 is attached to the main housing 11 and slides in a plane perpendicular to the axis of the motor 2. The linkage portion 41a of the push knob 41 drives the connecting rod 43 to rotate around the fulcrum 43a and pushes the switch 42 to start and stop.

[0031] The electric tool 100 of the present invention is provided with a connecting rod 43 in the accommodating cavity between the housing 1 and the motor 2, and the connecting rod 43 is pivotally connected to the housing 1 through the fulcrum 43a. The push knob 41 is fitted to the housing 1 and slides in a plane perpendicular to the axis of the motor 2, so that the rotation direction of the push knob 41 is consistent with the hand-gripping direction, which is ergonomic and easy to operate; and the push knob 41 drives the connecting rod 43 to rotate around the fulcrum 43a, and pushes the switch 42 to start and stop, which saves the space for the traditional connecting rod 43 to move forward and backward, shortens the overall length of the electric tool 100, and is conducive to the miniaturization of the electric tool 100.

Claims

1. An electric tool, comprising a housing, a motor located in the housing, and a switch assembly for controlling the start and stop of the motor, the housing comprising a main housing and a head housing fixed to the front end of the main housing, the motor comprising a stator supported in the main housing and a rotor sleeved in the stator, the front end of the rotor extending into the inner cavity of the head housing and supported in the head housing, the switch assembly comprising a push knob arranged outside the housing, a switch accommodated in the housing, and a connecting rod connected between the push knob and the switch, the push knob pushes the connecting rod to start and stop the switch, the push knob is arranged relative to the outside of the motor, a receiving cavity is arranged between the housing and the motor, the connecting rod is accommodated in the receiving cavity, and the switch is arranged at the rear side of the motor; characterized in that: The switch assembly includes a spring that rests against the push knob, a movable pressing portion is provided on the switch, the housing is provided with a supporting pin, and a fulcrum that is sleeved on the supporting pin is provided between the two ends of the connecting rod. When the push knob moves in a plane perpendicular to the motor axis, the connecting rod rotates around the fulcrum and pushes the pressing portion to start and stop the switch.

2. The electric tool according to claim 1, characterized in that: The housing has a first barrel portion for accommodating the motor and a second barrel portion for accommodating the switch, the diameter of the second barrel portion is smaller than that of the first barrel portion, the outer periphery of the first barrel portion of the housing is provided with a slide rail area extending perpendicular to the plane of the motor axis, the push knob is slidably installed on the slide rail area, the inner side of the push knob is provided with a reset portion protruding toward the housing, a positioning portion is provided on the slide rail area, one end of the spring abuts against the reset portion and the other end is limited on the positioning portion.

3. The electric tool according to claim 2, characterized in that: One end of the slide rail area along the sliding direction of the push-twist is provided with a boss protruding along the surface, and the other end is provided with a blocking portion recessed downward from the surface of the slide rail area; one side of the push-twist is provided with a hook portion clamped with the blocking portion, and the other side is provided with a limiting portion abutting against the boss, and the push-twist slides between the blocking portion and the boss.

4. The electric tool according to claim 3, characterized in that: When the switch is stopped, the spring presses the limiting portion of the push knob against the boss; when the switch is started, the push knob compresses the spring and the hook portion of the push knob is buckled on the blocking portion.

5. The electric tool according to claim 4, characterized in that: A battery pack is inserted into the rear end of the electric tool, one end of the pressing part is pivotally connected to the switch, and the other end swings up and down relative to the switch, one end of the connecting rod presses against the swinging end of the pressing part, and when one end of the connecting rod presses the pressing part and activates the switch, the battery pack supplies power to the motor.

6. The electric tool according to claim 1, characterized in that: The supporting pin protrudes inward from the inner wall of the housing.

7. The electric tool according to claim 1, characterized in that: The push knob is provided with a linkage part which penetrates the housing and extends to the inner cavity of the housing, and the front end of the connecting rod is provided with a through slot, and the linkage part passes through the through slot and is buckled on the connecting rod.

8. The electric tool according to claim 7, characterized in that: A contact portion folded toward the center of the housing is provided at the rear end of the connecting rod, and the contact portion is connected to the switch.

9. The electric tool according to claim 1, characterized in that: The electric tool also includes a transmission mechanism installed in the casing, the transmission mechanism includes a small bevel gear fixed to the front end of the rotor and an output component meshingly connected to the bottom of the small bevel gear and perpendicular to the rotor, the output component includes an output shaft supported in the casing and a large bevel gear fixed on the output shaft, the small bevel gear is meshingly connected to the large bevel gear.

10. The electric tool according to claim 9, characterized in that: The housing comprises a head housing cover fixed to the lower end of the head housing, the stator and the push-twist are arranged opposite to each other, and the output shaft is supported in the head housing cover and the head housing respectively.

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