JP2005238426A - Portable power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable power tool, in which a power supply indication lamp is provided on a power tool body so that the application of power supply voltage to the portable power tool is easily judged and the location of the portable power tool is easily grasped even in dark environment. <P>SOLUTION: The power tool has a power source indication lamp designed to light when power supply voltage is applied and to go out when a motor starts operating after an operational switch is turned on, and also has a control circuit designed to flicker or change light color of the lamp when excess current flows through a motor. The power supply indication lamp is arranged to be freely exchangeable. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a portable power tool provided with a power indicator lamp.

  Patent Document 1 discloses a configuration in which an illumination device that irradiates a work start location or the like is provided in order to improve the workability of a portable power tool. This lighting device is configured to be turned on / off in conjunction with a safety lever that is an off-lock mechanism of the drive switch.

JP 11-170203 A

  In the conventional portable electric tool described above, the illuminating device for irradiating the work start location and the like can be provided to improve workability in a dim work site or the like. In other portable power tools, it is impossible to immediately determine whether or not the power supply voltage is applied to the main body, and the work cannot be started smoothly.

  In particular, in portable power tools that have a power cord and a commercial power source instead of a storage battery as a driving source, whether or not a power source voltage is applied to the body, that is, the power cord is connected to the power source. It is impossible to immediately grasp whether or not it is present, and in a dimly lit work site, it cannot be further grasped, resulting in a decrease in workability.

  Further, it has been difficult for the conventional portable power tool to grasp the position of the portable power tool in a dimly lit work site.

  In addition, with conventional portable electric tools, overload is applied to the tip tool and cutting tool during work, and the operator cannot recognize that an overcurrent has flowed into the motor, resulting in an early life. It might have ended up.

  An object of the present invention is to provide a portable electric tool that solves the above-described conventional problems, can easily grasp that a power supply voltage is applied to the main body, and has good workability.

  Furthermore, it is an object of the present invention to provide a portable electric tool that can easily grasp the position of the tool body in a dimly lit work site or the like and has good workability.

  It is another object of the present invention to provide a portable electric tool that can suppress the end of life early by teaching that an overcurrent has flowed through the electric motor.

  The above-described object is achieved by providing a power indicator lamp that teaches that a power supply voltage is energized by lighting or blinking.

  In addition, when the power indicator lamp is lit or blinked when the electric motor is not operating, the position of the tool body can be easily grasped in a dimly lit work site or the like.

  In addition, when the power indicator lamp is turned on or blinks when an overcurrent flows through the motor, the operator can be informed that the overcurrent has flowed through the motor, and the service life is quickly reached. This can be suppressed.

  According to the present invention, it is possible to easily grasp that the power supply voltage is applied to the main body by providing the power supply indicator lamp that teaches that the power supply state is energized by lighting or flashing when the power supply voltage is applied. Therefore, it is possible to provide a portable power tool with good workability.

  In addition, when the power indicator lamp is turned on or blinks when the electric motor is not operating, the position of the tool body can be easily grasped in a dimly lit work site or the like.

  In addition, by configuring the power indicator lamp to turn on or blink when an overcurrent flows through the motor, it is possible to teach the operator that the overcurrent has flowed through the motor, resulting in an early life. Can be suppressed.

  An embodiment of the portable power tool of the present invention will be described with reference to FIGS. 1 is an overall side view showing an embodiment of the portable power tool of the present invention, FIG. 2 is an explanatory diagram of the operation status of cutting alignment work, and FIG. 3 is an enlarged view of the main part of FIG. FIG. 4 is a side view showing the viewing range of the light source of the power indicator lamp constituting the portable power tool of the present invention, and FIG. 5 is a control circuit diagram showing an embodiment of the portable power tool of the present invention. Hereinafter, a jigsaw will be described as an example of a portable electric tool.

  In FIG. 1, the jigsaw is provided with a drive switch 3 provided on the handle 7, an electric motor 2 that is driven when the drive switch 3 is turned on, and extends in a direction substantially orthogonal to the axial direction of the electric motor 2. There are provided a blade 5 for reciprocating up and down in the direction to cut the material to be cut 14, and a base 6 provided at the lower part of the main body and sliding on the material to be cut 14 during the cutting operation to stabilize the jigsaw body. A power cord 16 has one end connected to the jigsaw body and the other end connected to a commercial power source. When the power cord 16 is connected to a commercial power source, a power supply voltage is applied to the body and the drive switch 3 is turned on. Then, the electric motor 2 can be driven.

As shown in the drawing, the front part of the main body is provided with a blade 5 and an illumination device 4 that irradiates illumination light 10 around the front of the blade 5 in the cutting direction. In the lighting device 4, when the blade 5 is aligned with the cutting portion of the material to be cut 14 in a cutting operation applied from a commercial power supply via the power cord 16, the illumination light 10 is applied to the portion where the blade 5 and the material to be cut 14 are in contact with each other. Is provided. A power indicator lamp 1 is provided in a place where no blind spot is formed around the upper part of the main body.

In the above configuration, when a power cord plug of a jigsaw is inserted into an outlet and a power supply voltage is applied to the jigsaw body, the illumination device 4 provided at the front of the body and the power indicator lamp 1 provided at the top of the body. Lights up. At this time, the power indicator lamp 1 can be recognized from the entire periphery of the jigsaw body as shown in FIG. 4 and is not easily blocked by the obstacle 8. Note that, in a portable electric tool in which a lighting switch is separately provided in the lighting device 4, the lighting device 4 is not turned on unless the lighting switch of the lighting device 4 is turned on even when a power supply voltage is applied.
When performing the cutting operation, as shown in FIG. 2, the base 6 is applied to the material 14 to be cut, and the cutting operation is performed while visually adjusting the position of the blade 5 to be cut from obliquely above in the cutting direction. When the operation switch 3 is turned on and the drive blade 5 starts to move up and down in the electric motor 2, the power indicator lamp 1 provided on the upper part of the main body is turned off.

  After the blade 5 operates and the power indicator lamp 1 is extinguished, the blade 5 is aligned with the black line 11 on the material to be cut 14 as shown in FIG. When the operation switch 3 is turned off after the cutting operation is completed, the power indicator lamp 1 is turned on again.

  In the control circuit diagram shown in FIG. 5, when the AC power supply 16 is turned on, a current is passed through the lighting device 4 and the lighting device 4 is turned on. In addition, a current is supplied to the power indicator lamp 1 through the NC contact of the closed operation switch 3, and the power indicator lamp 1 is turned on. When the operation switch 3 is turned on, the NO contact of the operation switch 3 is closed, and the electric current from the AC power supply 16 is supplied to the motor to operate the motor. At the same time, the NC contact of the operation switch 3 is opened, the energization of the power indicator lamp 1 is cut off, and the power indicator lamp 1 is turned off. At this time, when the blade 5 is subjected to a load exceeding a specified value in the cutting operation and an overcurrent flows through the motor 2, the overcurrent sensor 12 detects the overcurrent, and the overcurrent display circuit 13 turns on the operation switch 3. The extinguished power indicator lamp 1 is turned on or the power indicator lamp 15 whose emission color is changed is turned on to notify the operator that an overcurrent is flowing. Moreover, the power indicator lamp 1 is replaceable, and the operator can select any light emission color.

The side view of the jigsaw which shows one Embodiment of this invention portable electric tool. Explanatory drawing of the operation status of cutting position alignment work. The enlarged view of the position alignment part of the blade which looked at FIG. 2 from the upper part. The side view which shows the visible range of the power indicator lamp by this invention Control circuit diagram

Explanation of symbols

1 is a power indicator lamp, 2 is an electric motor, 3 is an operation switch, 4 is an illumination device, 5 is a blade, 6 is a base, 7 is a handle, 8 is an obstacle, 9 is light of a power indicator lamp, 10 is illumination light, Reference numeral 11 is a black line, 12 is an overcurrent sensor, 13 is an overcurrent display circuit, 14 is a material to be cut, 15 is a power indicator lamp whose emission color is changed, and 16 is an AC power supply.

Claims (8)

A portable power tool comprising: a power tool including a motor and a tip tool for driving the motor as power; and a power indicator that teaches that a power supply voltage is applied to the power tool. The portable power tool according to claim 1, wherein the power indicator lamp is turned on or blinks when the electric motor is not operating to teach an energized state. The portable power tool according to claim 1 or 2, wherein the power indicator lamp is turned off while the electric motor is in operation. The portable electric tool according to claim 1, further comprising an illumination device that irradiates the tip tool portion. The portable power tool according to any one of claims 1 to 4, wherein the power indicator lamp lights or blinks when an overcurrent flows through the electric motor. The portable power tool according to claim 5, wherein the lighting or blinking of the power indicator lamp is performed with a light emission color different from that when the motor is not activated or blinking. The portable power tool according to any one of claims 1 to 6, wherein the power indicator lamp is provided at an uppermost part of the main body. The portable power tool according to any one of claims 1 to 5, wherein the power indicator lamp can be replaced, and an operator can select an arbitrary emission color.

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