KR101804444B1

KR101804444B1 - Portable electric power tool having overload warning means

Info

Publication number: KR101804444B1
Application number: KR1020150082627A
Authority: KR
Inventors: 박준하
Original assignee: 주식회사 아임삭
Priority date: 2015-06-11
Filing date: 2015-06-11
Publication date: 2017-12-04
Also published as: KR20160146052A

Abstract

The present invention relates to a portable power tool in which a motor rotating by a power source is embedded in a case, wherein the power tool has at least one of an amount of current supplied to the motor or a temperature sensed by a temperature sensor provided around the motor And a control unit for determining whether the vehicle is in a predetermined normal state, a first overload state, or a second overload state, wherein the case includes an LED warning light emitting different colors corresponding to the state determined by the control unit .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a portable electric power tool having overload warning means,

The present invention relates to a portable power tool capable of performing a drill, a driver or a grinder by the rotation of a motor, and more particularly, to a portable power tool capable of operating a power tool before a clutch of a gearbox is activated Thereby preventing malfunction of the motor and the gear box.

A portable power tool is equipped with a built-in battery or a motor driven by an externally supplied power source, and various tools such as a drill, a screwdriver, a grinder or a circular saw are mounted on a tool mounting socket extended from the rotation axis of the motor .

Portable power tools are easy to carry and have the advantage of being able to conveniently perform drills, drivers, grinders or cutting operations wherever power is supplied. Especially when the rechargeable battery is built in, it can be easily used even in a place where the power is not supplied, or the work space is too wide to use by installing an extension cable for power supply, Recently, various rechargeable portable power tools have been introduced because it can.

In addition to the basic functions of driving a tool with a built-in motor, there are a number of widely used portable power tools that can be configured with a torque stage or have an impact function.

The function to set the torque stage is based on the material of the workpiece using the tool, such as soft or hard wood, plastic, steel, stainless steel, etc., So that it can be varied over the stages.

However, when a tool using a torque stage is subjected to a force exceeding a set torque due to a situation where a tool is caught in a workpiece, there is a high possibility that an overcurrent flows in a state where the rotor of the motor is stopped. Accordingly, a technique of applying a gear box having a clutch function to protect the motor has been introduced, for example, Korean Utility Model Publication No. 2013-0078129 entitled "Power Tool Clutch Device ".

As such, application of a gearbox with a clutch function significantly reduces the likelihood of failure of the motor, but repeatedly switching gears to the clutch state is likely to cause the gearbox to fail, thus reducing the repetitive clutch condition It is more preferable to stop the power tool operation in advance before the clutch is operated.

On the other hand, in a power tool having an impact function (Patent Document 2), it is also necessary to prevent a torque at such a level as to cause a failure to the motor to operate because a momentarily high torque acts.

Accordingly, it is desirable to give a warning to the user in advance so as not to overload the motor, which is a core component of the portable power tool, and to overload that may cause failure of various gear boxes. However, a portable power tool having a device It is not introduced.

Korean Laid-Open Patent No. 2013-0078129 (published on October 10, 2013) Korean Laid-Open Patent No. 2014-0106189 (published on April 3, 2014)

Accordingly, it is an object of the present invention to provide a portable power tool having a motor, which is a core component of a portable power tool, and means for effectively recognizing the user in such a state before an overload, And the like.

Here, the LED warning lamp may emit light of a green color when in a normal state, orange when it is in a first overload state, and red when it is in a second overload state.

The grip portion of the case may further include a vibration device for generating a vibration mode distinguished from each other corresponding to the first overloaded state and the second overloaded state.

The frequency of the vibration mode corresponding to the second overloaded state is preferably larger than the frequency of the vibration mode corresponding to the first overloaded state.

Further, in one embodiment of the present invention, the vibrating device may be provided on both sides of the grip portion where the user's palm contacts.

The portable electric power tool of the present invention monitors the amount of electric current supplied to the motor and the temperature around the motor so as to consider the instantaneous overload state as well as the accumulation of the load over a long period of time, The occurrence of a failure can be remarkably reduced.

In addition, since the portable power tool of the present invention warns of an overload by a visual signal (light) as well as a tactile signal (vibration), it is possible to recognize an overload warning as a tactile signal even if a visual signal is not displayed There is another advantage to the point.

1 is a view showing an installation state of an overload warning means provided in a portable power tool according to the present invention.
Fig. 2 is a block diagram showing a configuration relating to the operation of the overload warning means shown in Fig. 1. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments of the present invention, a description of well-known structures that can be easily understood by those skilled in the art will be omitted so as not to obscure the gist of the present invention. In addition, when referring to the drawings, it should be considered that the thicknesses of the lines and the sizes of the constituent elements shown in the drawings may be exaggerated for clarity and convenience of explanation.

FIG. 1 is a view showing an installation state of an overload warning means provided in the portable power tool 10 according to the present invention. FIG. 2 is a block diagram relating to the operation of the overload warning means shown in FIG. 1, The present invention will be described.

A portable electric power tool 10 according to the present invention is a case in which a motor rotating by a power source is built in a case 100 and the basic structure of the inside of a motor or a clutch gear box is the same as that of a conventional portable electric power tool, .

The portable electric power tool 10 shown in FIG. 1 is configured such that at least one of the amount of electric current supplied to the motor or the temperature sensed by the temperature sensor 220 installed in the vicinity of the motor is a predetermined steady state, a first overload state, 2 overload state, and the configuration of the control unit 200 is shown in Fig. In FIG. 2, the configuration of the current circuit capable of measuring or detecting the amount of current is represented by a component called the current sensing unit 210.

Here, the steady state refers to a state in which there is no complication in the operation of the motor, for example, a state in which the motor is operated at a maximum torque of a set torque end or lower.

The first overload state refers to a state in which the operation for a short period of time does not affect the motor but the motor is burned out or malfunctions if the motor is continuously operated for a long time as the motor is operated at the next higher torque end exceeding the maximum torque of the set torque end .

The second overload state is a state in which it is desirable to immediately stop using the portable power tool 10 immediately after the first overload state, for example, a state immediately before the clutch of the clutch gear box is operated.

These three states are respectively set on the basis of the amount of current supplied to the motor and the temperature value sensed by the temperature sensor 220 installed in the periphery of the motor. These set values are determined by the specifications of the portable power tool 10 Current value or temperature condition).

Here, the amount of current supplied to the motor is a reference value for detecting an overload state that occurs relatively instantaneously, and the temperature around the motor is a reference value for determining a load amount accumulated over a relatively long time, If any of the set values shows an overload condition, it is displayed. For example, according to the amount of electric current supplied to the motor, when it is determined that the motor is in the first overload state, it is indicated that the motor is in the first overload state, will be.

The determination result of the overload state of the controller 200 is displayed to the user through the LED warning lamp 300. That is, in response to the steady state, the first overload state, and the second overload state determined by the control unit 200, the LED warning lamp 300 emits different colors to display the corresponding state to the user.

There are no specific limitations on the specific colors if the three types of colors emitted by the LED warning lamp 300 are clearly distinguished from each other. However, in a normal state such as a traffic signal, in accordance with the meaning of a color (warning level) In the case of the first overloaded state, the orange-colored light is emitted. In the second overloaded state, the light of the red-colored light-emitting state is most clearly displayed without confusion.

The mounting position of the LED warning lamp 300 is provided above the case 100 where the grip portion 110 of the portable power tool 10 is located so that the portable power tool 10 is gripped and handled It is appropriate to make it visible to the user's eyes.

However, depending on the posture of the user who handles the portable power tool 10, it is difficult to visually observe the LED warning lamp 300. For example, when the portable power tool 10 is lifted upwards, the LED warning lamp 300 is hidden from the bottom of the case 100, or is invisible as it is folded and used deep inside the narrow space. Occasionally.

Therefore, in consideration of this situation, the present invention can be embodied in a case in which a vibration device 400 for generating vibration modes distinguishable from each other in correspondence to the first overloaded state and the second overloaded state is embedded in the grip portion 110 of the case 100 An example is provided. Here, the steady state is excluded because it is inappropriate to generate a separate vibration.

The vibration device 400 is a component that generates vibration by rotating an eccentric weight or vibrating the weight up and down, which can be easily found in various electronic devices such as today's smartphones. However, since the portable power tool 10 of the present invention is much larger in size and weight than a smartphone and generates vibration itself due to the operation of the motor, the vibrating device 400, It needs to be applied. For example, it is preferable to apply a technique of producing a strong vibration as much as a vibration device built in a controller of a video game machine.

In the present invention, the vibrating device 400 is embedded in the grip portion 110 of the case 100. This is because vibrations occur throughout the case 100 due to the operation of the motor of the portable power tool 10, This is because it is necessary to effectively transmit a warning about the overload state by generating vibration that is felt locally strong in one palm.

The vibration device 400 generates a vibration mode distinguishable from each other in correspondence to the first overloaded state and the second overloaded state. By changing the frequency of the vibration mode to be different from or different from that of the intermittent cycle, .

Here, since the strong and fast vibration is generally recognized as a warning, such as the color of the LED warning lamp 300, the frequency of the vibration mode corresponding to the second overloaded state is the frequency of the vibration mode corresponding to the first overloaded state Is preferable. Or when the intermittent oscillation period is changed, the same effect can be obtained by making the oscillation in the second overload state shorter, that is, more frequently.

In addition, according to an embodiment of the present invention, two vibration mechanisms 400 may be provided on both sides of the grip 110 where the user's palm contacts, in consideration of both right-handed and left-handed This is because it is more preferable that the warning vibration of the vibration device 400 is directly transmitted to the palm of the hand. As described above, the portable power tool 10 of the present invention warns of an overload state with a tactile signal (haptic) as well as a visual signal, so that even if a visual signal is not visible according to an operator's posture, .

Further, according to another embodiment of the present invention, a sound output device may be provided in the power tool 10. [ The sound output apparatus may include a memory connected to the control unit 200 and installed in the form of a speaker on the outer surface of the power tool 10 and configured to maintain sound data set under the control of the control unit 200. [ According to the determination of the control unit 200, the sound output device outputs different sounds selected corresponding to the first overload state and the second overload state, thereby allowing the user to recognize the state. The sound output device may be operable to output various types of sound such as a human voice or a buzzer sound.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be possible. Accordingly, the scope of the present invention will be determined by the appended claims and their equivalents.

10: Portable power tool 100: Case
110: grip part 200: control part
210: current sensing unit 220: temperature sensor
300: LED warning lamp 400: Vibration device

Claims

1. A portable power tool having a motor rotated by a power source,
A current sensing unit for sensing an amount of current supplied to the motor;
A temperature sensor provided around the motor for measuring a temperature;
Comparing the sensed current amount or the measured temperature with a motor permissive current value specification and a temperature condition specification of the portable power tool respectively to determine whether the state of the portable electric power tool is in a state of being operated at a maximum torque of a set torque end State, a first overload state in which the maximum torque of the set torque stage is exceeded and the second overload state is operated in the next higher torque stage, and a second overload state in which the clutch of the clutch gear box is operated beyond the first overload state A controller for controlling the operation of the LED warning lamp or the operation of the vibration device according to the determined state;
The portable electric power tool according to claim 1 or 2, wherein the portable electric power tool is installed at an upper end of the case in which the grip portion of the portable electric power tool is located, Light, an LED warning light emitting a red light in the second overload state; And
And a second vibrating unit that is built in both sides of the grip unit to which the user's palm of the portable power tool is contacted and which, when the state of the portable power tool is under the control of the control unit, And in a second overload state, vibrating at every second oscillation period having a second period greater than the first oscillation period and shorter than the first oscillation period,
Wherein the power tool comprises:

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