CN201298161Y - Safety control device of an electric tool - Google Patents

Abstract

The utility model provides a safety control device for an electric tool. The electric tool includes a casing, a handle installed on the casing, a cutting tool and a power switch. The safety control device includes a A pressure sensor, a microprocessor and a control switch are connected in series with the power switch. When the user uses an electric tool, the pressure sensor will detect the user's grip on the handle, and output a detection signal to the microprocessor, and the microprocessor will compare the detection signal with a threshold value It is judged whether the user pays enough attention to the operation, and at the same time outputs a control signal to the control switch, and the control switch is opened or closed according to the control signal. The safety control device of the electric tool of the utility model effectively reduces potential risks by detecting the user's attention to operation, and greatly improves the operation safety of the electric tool.

Description

Safety controls for power tools

technical field

The utility model relates to a safety control device of an electric tool, more precisely, relates to a safety control device for controlling the start and stop of the electric tool.

Background technique

At present, many power tools on the market, especially those with great potential hazards, such as chain saws, electric circular saws, reciprocating saws, etc., are basically equipped with a second handle or auxiliary handle. Two-handed operation can improve the power tools. operational security. At the same time, studies have shown that when people operate these power tools, if they are not concentrating, their grip on the handle will be reduced. In this case, it will cause potential danger to the user.

Contents of the invention

The purpose of this utility model is to provide a safety control device on an electric tool, which can prevent possible dangers caused by the user's negligence and improve the safety of the electric tool.

The utility model provides a safety control device for an electric tool. The electric tool includes a casing, a handle installed on the casing, a cutting tool and a power switch. The safety control device includes a A pressure sensor, a microprocessor and a control switch are connected in series with the power switch. When the user uses an electric tool, the pressure sensor will detect the user's grip on the handle, and output a detection signal to the microprocessor, and the microprocessor will compare the detection signal with a threshold value It is judged whether the user pays enough attention to the operation, and at the same time outputs a control signal to the control switch, and the control switch is opened or closed according to the control signal. The pressure sensor can be arranged on the main handle or the auxiliary handle of the electric tool, or on the main handle 1 and the auxiliary handle 2 at the same time. The number of pressure sensors can be one or more. In addition, when the connection between the sensor and the microprocessor is inconvenient, the signal can be transmitted in a wireless manner.

The safety control device of the electric tool of the utility model can detect the user's attention to operation through the pressure sensor, thereby effectively reducing potential risks and greatly improving the operation safety of the electric tool.

Description of drawings

Fig. 1 is the schematic diagram of electric circular saw of the present utility model;

Fig. 2 is a schematic diagram of the connection of the safety control device of the electric circular saw of the present invention, at this time, a pressure sensor is provided on the auxiliary handle of the electric circular saw;

Fig. 3 is a connection schematic diagram of the safety control device of the electric circular saw of the present invention, at this time, a plurality of pressure sensors are arranged on the auxiliary handle of the electric circular saw.

Detailed ways

The utility model uses an electric circular saw as an example to illustrate the safety control device of an electric tool.

As shown in Figure 1, the electric circular saw 100 of the present invention includes a main handle 1 and a pair of handles 2, the main handle 1 is equipped with a main power switch K, and at the same time, the auxiliary handle 2 is provided with a pressure sensing area S, a pressure sensor is arranged on the pressure sensing area S. This pressure sensor is used to detect the grip force of the operator on the auxiliary handle 2 .

As shown in Fig. 2, the safety control device of the electric circular saw of the present invention includes a microprocessor MCU. The output of the microprocessor MCU controls the opening and closing of the contact of a relay KA, and the normally open contact of the relay KA is connected in series with the main switch KA on the power supply. When the user uses the electric circular saw 100, he first needs to turn on the main switch K of the power supply by pressing the trigger. After the main switch K is turned on, the microprocessor MCU will receive the output signal from the sensor. The microprocessor MCU compares the output signal with a threshold, which is related to the normal grip force exerted by the user on the auxiliary handle 2 when using the electric circular saw normally. If the signal is greater than the threshold, the microprocessor MCU will think that the operator has enough attention to its operation, so it will send a conduction signal to the relay KA. The normally open contact of the relay KA is closed under the effect of the conduction signal, and the motor M of the electric circular saw 100 is turned on, and the cutting operation can be performed at this time. If the signal of the sensor is less than the threshold value, the microprocessor MCU will judge that the operator is not concentrating, so a closing signal is output to the relay KA, and the normally open contact of the relay remains open under the action of the closing signal. Normally open, the motor M of the electric circular saw 100 cannot be switched on, and the cutting operation cannot be performed at this time.

Of course, as shown in Figure 3, multiple pressure sensors can also be set on the pressure sensing area S, so that the microprocessor MCU needs to judge the output signal of each pressure sensor separately, only when the signals of all sensors are greater than the threshold , the electric circular saw 100 can start the cutting operation.

Of course, when the connection between the sensor and the micro-processing MCU is inconvenient, the signal can be transmitted in a wireless manner.

Of course, the sensor can also be arranged on the main handle 1 , or on the main handle 1 and the auxiliary handle 2 at the same time. The relay can also be replaced by other switches, as long as the switch can respond to the output signal of the microprocessor MCU.

The utility model is not limited to the specific schemes disclosed above and in the attached drawings, and other equivalent forms are also possible. It should be noted that the above embodiments are non-limiting. Except for this embodiment, all transformations made by those skilled in the art based on common sense all fall within the protection scope of the present utility model.

Claims (6)

1. the safety control of an electric tool, described electric tool comprises a casing, be installed in the handle on the casing, an one cutting instrument and a power switch, it is characterized in that, described safety control comprises one and places on the described handle, survey the user to described handle curable grip and export the pressure transducer of a detectable signal, one receives described detectable signal, and judge that by a more described detectable signal and a threshold size microprocessor and whether the user has enough attention rates to operation and export a control signal simultaneously receives described control signal and disconnects or closed gauge tap described gauge tap and described power switch polyphone according to described control signal.

2. the safety control of electric tool according to claim 1 is characterized in that, described handle is the main handle or the secondary handle of described electric tool.

3. the safety control of electric tool according to claim 1 is characterized in that, described gauge tap is one to comprise the relay of normally opened contact.

4. the safety control of an electric tool, described electric tool comprises a casing, be installed in the handle on the casing, an one cutting instrument and a power switch, it is characterized in that, described safety control comprises a plurality of placing on the described handle, survey the user to described handle curable grip and export the pressure transducer of a plurality of detectable signals, one receives described a plurality of detectable signals, and judge that by more described a plurality of detectable signals and a threshold size microprocessor and whether the user has enough attention rates to operation and export a control signal simultaneously receives described control signal and disconnects or closed gauge tap described gauge tap and described power switch polyphone according to described control signal.

5. the safety control of electric tool according to claim 4 is characterized in that, described handle is the main handle or the secondary handle of described electric tool.

6. the safety control of electric tool according to claim 4 is characterized in that, described gauge tap is one to comprise the relay of normally opened contact.

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