Linkage type safety protection device of electric tool

Abstract

The utility model discloses a linkage type safety protection device of an electric tool, and the device comprises a motor which is used as a power driving element of the electric tool; the transmission shaft is directly or indirectly driven by a motor; the movable plate can be movably close to or far away from the transmission shaft; the locking block is used for limiting the movement of the movable plate; the locking pin is driven by the movable plate and is used for limiting the rotation of the transmission shaft; the switch is used for controlling starting and stopping of an internal circuit of the motor or the electric tool; the first end of the trigger rod abuts against the movable plate, the second end of the trigger rod is close to the switch, and the trigger rod is driven by the movable block to move in the axial direction to trigger on-off of the switch. According to the electric tool, mechanical linkage is adopted, automatic disconnection of an internal circuit of the electric tool can be completed while the transmission shaft is locked, operation is convenient, and use safety is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to a linkage safety protection device for electric tools. Background Art

[0002] With the widespread use of power tools in daily life, safety issues have become the focus of attention. In order to ensure the personal safety of users, power tools must have a safe and reliable power-off protection function. For example, when the working head or tool of the power tool needs to be replaced, for traditional power tools, the switch is still in standby mode. When replacing at this time, if the user accidentally touches the switch, the power tool will start again, causing danger.

[0003] The above contents are only used to assist in understanding the technical solution of the present application, and do not constitute an admission that the above contents are the closest prior art to the present application. Summary of the invention

[0004] Based on this, the present application proposes a linkage safety protection device for an electric tool, which can solve the above-mentioned technical problems.

[0005] The technical solution adopted by the present application to solve its technical problems is: a linkage safety protection device for an electric tool, comprising: a motor, serving as a power driving element of the electric tool; a transmission shaft, driven directly or indirectly by the motor; a movable plate, which can move closer to or away from the transmission shaft; a locking block, used to limit the movement of the movable plate; a locking pin, driven by the movable plate, used to limit the rotation of the transmission shaft; a switch, used to control the start and stop of the internal circuit of the motor or the electric tool; and also comprising a trigger rod, a first end of which abuts against the movable plate and a second end is close to the switch, which is driven by the movable block to move axially to trigger the switch to turn on and off.

[0006] In some embodiments, a first spring is arranged between the locking pin and the movable plate, a locking hole is radially arranged on the transmission shaft, and the first spring drives the locking pin to press against the transmission shaft and is inserted into the locking hole after the transmission shaft rotates.

[0007] In some embodiments, the switch is a push switch, and the second end of the trigger rod is controlled to be on or off by pressing the switch.

[0008] In some embodiments, the switch is a proximity switch, and the second end of the trigger rod approaches a set position of the switch to achieve on-off control.

[0009] In some embodiments, the switch is connected to a sensor, and the movement of the trigger rod enables the sensor to send a signal to the switch to achieve on-off control.

[0010] In some embodiments, a guide groove is provided on the movable plate, and a limiting member connected to the power tool body is provided in the guide groove to guide and limit the movable plate.

[0011] In some embodiments, a second spring is sleeved on the locking pin, and the second spring is used to drive the locking pin away from the transmission shaft.

[0012] In some embodiments, the movable plate is provided with a first guide slope of different heights, and the trigger rod is provided with a third spring for driving its first end to always rest against the first guide slope. Through the movement of the movable plate, the trigger rod is made to rest against different heights of the first guide slope, thereby achieving the second end of the trigger rod approaching or moving away from the switch.

[0013] In some embodiments, a second guiding inclined surface and a limiting step are provided on the movable plate, and the locking block is used to push the second guiding inclined surface or lock the limiting step.

[0014] In some embodiments, a button is provided on the movable plate, at least a portion of the button is exposed outside the electric tool, and the movable plate is driven to move by pressing the button.

[0015] The beneficial effect of the present application is that the internal circuit of the electric tool can be automatically disconnected while the transmission shaft is locked by mechanical linkage, which is easy to operate and improves safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the state in which the transmission shaft of the present application is not locked and the switch is not triggered.

[0018] Figure 2 It is a schematic diagram of the state in which the transmission shaft of the present application is locked and the switch is triggered.

[0019] Figure 3 This application Figure 2 Schematic diagram from another angle.

[0020] Figure numerals: 1. Motor, 2. Transmission shaft, 21. Lock hole, 3. Movable plate, 31. Guide groove, 32. First guide slope, 33. Second guide slope, 34. Limit step, 35. Button, 4. Locking block, 5. Locking pin, 51. First spring, 52. Second spring, 6. Switch, 7. Trigger rod, 71. Third spring, 8. Limiting member. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection of this application.

[0022] Reference Figure 1-3 As shown, a linkage safety protection device for an electric tool is provided, which mainly includes:

[0023] The motor 1 is used as a power driving element of the electric tool.

[0024] The transmission shaft 2 is driven directly or indirectly by the motor 1. In the present embodiment, the transmission shaft 2 is connected to the rotor shaft of the motor 1. It can be used as an output shaft to directly output, or it can be connected to other series of transmission mechanisms.

[0025] The movable plate 3 can be movably moved closer to or away from the transmission shaft 2. In a specific implementation, the movable plate 3 is slidably connected to the housing of the electric tool to achieve movement.

[0026] The locking block 4 is used to limit the movement of the movable plate 3. In a specific implementation, the locking block 4 is slidably disposed on the housing of the power tool, and at least a portion of it is placed outside the power tool, so that it can be easily operated. Preferably, the locking block 4 has a push button to facilitate the application of force to it.

[0027] The locking pin 5 is driven by the movable plate 3 to limit the rotation of the transmission shaft 2. Specifically, there are multiple ways to limit the transmission shaft 2, such as directly inserting it into the transmission shaft 2 to lock it, or maintaining a frictional contact with the transmission shaft 2 with pressure to achieve locking of the transmission shaft 2.

[0028] The switch 6 is used to control the start and stop of the internal circuit of the motor 1 or the electric tool. The switch 6 is mainly used as a circuit disconnecting device of the safety protection device, which can be installed inside the electric tool and connected to the corresponding circuit.

[0029] Finally, a trigger rod 7 is included, the first end of which is against the movable plate 3, and the second end is close to the switch 6. The movable block drives the trigger rod 7 to move axially to trigger the switch 6 to turn on and off. The trigger rod 7 has a specific length and shape, so that it can be adapted to different internal structural arrangements of the power tool to meet the spatial design requirements. For example, it can be a long rod with a certain extension length, or a special-shaped component with a bend.

[0030] During the implementation process, for example, when the tool or working head of the output shaft needs to be replaced, the whole machine or the motor 1 should be powered off. The locking pin 5 is locked to the transmission shaft 2 by pushing the movable plate 3. During this process, the trigger rod 7 moves with the movement of the movable plate 3, thereby disconnecting the circuit of the switch 6.

[0031] Some preferred / improved embodiments based on the above embodiments will be described below. Any one of the following embodiments may be selected, or multiple embodiments may be selected and combined.

[0032] Preferably, a first spring 51 is provided between the locking pin 5 and the movable plate 3, a locking hole 21 is radially provided on the transmission shaft 2, and the first spring 51 drives the locking pin 5 to abut against the transmission shaft 2 and is inserted into the locking hole 21 after the transmission shaft 2 rotates. In this way, during operation, the movable plate 3 drives the locking pin 5 to abut against the transmission shaft 2 through the first spring 51, and can complete the self-locking of the transmission shaft 2, which is convenient for operation.

[0033] For the switch 6 in the above embodiment, there are multiple further implementations:

[0034] For example, the switch 6 is a push switch 6 , and the second end of the trigger rod 7 realizes on-off control by pressing the switch 6 .

[0035] For another example, the switch 6 is a proximity switch 6, and the second end of the trigger rod 7 approaches the set position of the switch 6 to realize on-off control.

[0036] For another example, the switch 6 is connected to a sensor, and the sensor sends a signal to the switch 6 through the movement of the trigger lever 7 to achieve on-off control. The sensor can be in various forms, such as infrared sensors, displacement sensors and other detection methods.

[0037] Regarding the installation of the movable plate 3: the movable plate 3 is provided with a guide groove 31, in which a limiting member 8 connected to the power tool body is provided to guide and limit the movable plate 3. Preferably, the guide groove 31 is provided at two locations, and the limiting member 8 is selected to be a screw or a pin.

[0038] In order to facilitate the self-reset of the locking pin 5, a second spring 52 is sleeved on the locking pin 5, and the second spring 52 is used to drive the locking pin 5 away from the transmission shaft 2. In this way, the locking pin 5 can be automatically unlocked from the transmission shaft 2 without being acted upon by the movable plate 3.

[0039] Regarding the cooperation mode between the trigger rod 7 and the movable plate 3, it is preferred that: the movable plate 3 is provided with a first guide slope 32 of different heights, and the trigger rod 7 is provided with a third spring 71 for driving its first end to always rest against the first guide slope 32, and the trigger rod 7 is made to rest against different heights of the first guide slope 32 through the movement of the movable plate 3, thereby achieving the second end of the trigger rod 7 approaching or moving away from the switch 6.

[0040] For easy operation, the movable plate 3 is provided with a second guide slope 33 and a limiting step 34, and the locking block 4 is used to push the second guide slope 33 or lock the limiting step 34. In order to facilitate the return of the locking block 4, the locking block 4 is also provided with a fourth spring.

[0041] Furthermore, a button 35 is provided on the movable plate 3 , and at least a part of the button 35 is exposed outside the electric tool. The movable plate 3 is driven to move by pressing the button 35 .

[0042] The linkage safety protection device in the above embodiment can be applied to various types of electric tools, such as angle grinders, trimmers, and bakelite milling machines.

[0043] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A linkage safety protection device for an electric tool, characterized in that: include: The motor, which is the power drive element of the power tool; The transmission shaft is driven directly or indirectly by the motor; A movable plate, which can move toward or away from the transmission shaft; A locking block, used to limit the movement of the movable plate; A locking pin, driven by the movable plate, for limiting the rotation of the transmission shaft; A switch for controlling the start and stop of the internal circuit of the motor or power tool; The trigger rod has a first end abutting against the movable plate and a second end close to the switch, and is driven by the movable block to move axially to trigger the switch to be turned on and off.

2. The linkage safety protection device for an electric tool according to claim 1, characterized in that: A first spring is arranged between the locking pin and the movable plate, a locking hole is radially arranged on the transmission shaft, and the first spring drives the locking pin to abut against the transmission shaft and is inserted into the locking hole after the transmission shaft rotates.

3. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The switch is a push switch, and the second end of the trigger rod realizes on-off control by pressing the switch.

4. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The switch is a proximity switch, and the second end of the trigger rod approaches the set position of the switch to realize on-off control.

5. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The switch is connected to a sensor, and the sensor sends a signal to the switch through the movement of the trigger rod, thereby realizing on-off control.

6. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The movable plate is provided with a guide groove, and a limiting member connected to the electric tool body is provided in the guide groove to guide and limit the movable plate.

7. The linkage safety protection device for an electric tool according to claim 1, characterized in that: A second spring is sleeved on the locking pin, and the second spring is used for driving the locking pin away from the transmission shaft.

8. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The movable plate is provided with a first guide inclined surface of different heights, and the trigger rod is provided with a third spring for driving its first end to always rest against the first guide inclined surface. Through the movement of the movable plate, the trigger rod is made to rest against different heights of the first guide inclined surface, thereby achieving the second end of the trigger rod approaching or moving away from the switch.

9. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The movable plate is provided with a second guiding inclined surface and a limiting step, and the locking block is used to push the second guiding inclined surface or lock the limiting step.

10. The linkage safety protection device for an electric tool according to claim 1, characterized in that: The movable plate is provided with a button, at least a part of which is exposed outside the electric tool, and the movable plate is driven to move by pressing the button.

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