KR20160117755A

KR20160117755A - Electric tool

Info

Publication number: KR20160117755A
Application number: KR1020150044969A
Authority: KR
Inventors: 유진호
Original assignee: 계양전기 주식회사
Priority date: 2015-03-31
Filing date: 2015-03-31
Publication date: 2016-10-11

Abstract

The present invention relates to a power tool comprising a power tool housing including a motor mounted therein and a vent hole communicating with the outside to introduce outside air, a high speed position where the motor rotates at high speed, and a low speed position And a maximum opening position which is formed integrally with the speed adjusting unit and the speed adjusting unit and opens the ventilation opening at the maximum speed when the ventilation opening is in the high speed position and a maximum opening position which maximally opens the ventilation opening at the high speed position, And a ventilation regulator for moving between the open positions and regulating the degree of opening of the ventilation openings.

Description

ELECTRIC TOOL

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool, and more particularly, to a power tool capable of ventilation control.

Generally, a power tool drives a built-in motor using electric power as a power source through a wire or a battery to rotate the tool selectively coupled according to the operation purpose of a driver and a drill to perform multi-task such as tightening a screw or drilling a hole It is one of the tools that can be used.

The power tool includes a housing in which the motor and the like are assembled. The housing has a vent hole through which external air flows to cool the driving heat generated by the motor when the power tool is driven.

Since a plurality of the ventilation holes are formed to have a constant size, external air having a constant flow rate is introduced into the housing irrespective of the rotational speed of the motor or the working environment.

For example, in a water or dusty environment, the amount of air entering the vents should be reduced to protect parts inside the power tool. For this, there is a problem that the operator must block the ventilation hole by a hand or another means.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power tool capable of adjusting a ventilation hole of a housing according to a rotational speed of a motor.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

To achieve the above object, according to one aspect of the present invention, there is provided an electric power tool comprising: a housing of a power tool including a motor mounted therein, a vent hole communicating with the outside to receive external air, A speed adjusting unit that is movable between a high speed position at which the motor rotates at a low speed and a speed adjusting unit that is integrally formed with the speed adjusting unit, And a ventilation regulator which moves between a minimum opening position for opening the ventilation opening at the low speed position and a minimum opening position for regulating the opening degree of the ventilation opening.

In this case, the ventilation control unit includes a plurality of mesh-shaped inflow holes facing the ventilation holes and formed at regular intervals.

And the number of the inflow holes of the ventilation control unit increases from the maximum opening position toward the minimum opening position.

Further, the plurality of inflow holes of the ventilation control unit are reduced in size from the maximum opening position toward the minimum opening position.

According to the above-mentioned problem solving means, the present invention is characterized in that a ventilation regulating portion for regulating the opening size of the ventilation opening formed in the housing of the power tool is provided in the speed regulating portion for regulating the motor speed of the electric power tool, The effect can be controlled.

That is, when the speed of the motor is high, the ventilation hole is opened to the maximum so that the outside air can be sufficiently introduced into the housing. When the speed of the motor is low, the ventilation hole is opened to the minimum, The amount of air flowing into the housing can be adjusted according to the rotational speed of the motor.

Further, since the ventilation control unit is integrally formed with the speed control unit, the speed of the motor can be controlled and the opening size of the ventilation opening can be adjusted.

In addition, since the position of the speed adjusting portion is semi-automatically adjusted, the operator using the power tool can adjust the positions of the speed adjusting portion and the ventilation adjusting portion with a small force.

1 is a perspective view illustrating a power tool according to an embodiment of the present invention,
Figure 2 is an exploded view of the housing of Figure 1,
3 is an operation diagram of the speed adjusting unit and the ventilation adjusting unit of FIG. 2,
Fig. 4 is a modification of the ventilation control unit of Fig. 2,
5 is another modification of the ventilation regulator of FIG.

It should be understood that the specific details of the invention are set forth in the following description to provide a more thorough understanding of the present invention and that the present invention may be readily practiced without these specific details, It will be clear to those who have knowledge.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to FIGS. 1 to 5, and a description will be given centering on parts necessary for understanding the operation and operation according to the present invention.

1 is an exploded view of the housing of FIG. 1, FIG. 3 is an operation view of the speed adjusting unit and the ventilation adjusting unit of FIG. 2, and FIG. 4 is a view 2 is a modification of the ventilation control unit of Fig. 2, and Fig. 5 is another modification of the ventilation control unit of Fig.

As shown in these drawings, the power tool 10 according to the embodiment of the present invention includes a motor 120 mounted therein, a high-speed position where the motor 120 rotates at a high speed (see FIG. 3 (a)) rotating at a low speed and the low speed position (FIG. 3 (b)) rotating at a low speed and the speed adjusting unit 200, 3 (a)) that maximally opens the ventilation hole 140 and the minimum opening position (FIG. 3 (b)) that minimally opens the ventilation hole 140 at the low-speed position And a ventilation control unit 300 for controlling the degree of opening of the ventilation hole 140.

INDUSTRIAL APPLICABILITY The electric power tool 10 of the present invention is a tool that can be easily and quickly operated by using the force of an electric motor. The power tool may be implemented by any one of an electric drill for drilling a hole, an electric screwdriver for tightening or loosening a screw, an electric grinder used for finishing or polishing, or an electric grinder.

A plurality of ventilation holes 140 of the housing 100 are formed on the outer surface of the housing 100 so as to communicate with the inside of the housing 100. That is, as shown in FIGS. 1 and 2, a plurality of ventilation holes 140 may be formed on the side surface of the housing 100. In the present invention, a plurality of ventilation holes 140 are formed on the side surface of the housing 100 to have the same width along the up and down directions. However, the present invention is not limited to the shape, number, and the like of the ventilation holes 140.

The speed regulator 200 is formed on the upper side of the housing 100 to adjust the rotational speed of the motor 120 of the power tool 10. At this time, the speed regulator 200 can adjust the rotational speed of the motor 120 through the linear motion in the forward and backward directions, and the control range can be changed according to the conditions of the invention. In the embodiment of the present invention, the speed controller 200 adjusts the speed of the motor 120 in two steps of a high-speed position for moving forward and a low-speed position for moving backward.

The speed regulator 200 further includes a plurality of springs 220 and 240. The springs 220 and 240 may include a first spring 220 for guiding the position of the speed regulator 200 when the speed regulator 200 moves to a high speed position or a low speed position, And a second spring 240 for locking the position of the speed regulator 200 in a high speed position and a low speed position.

The first and second springs 220 and 240 may be formed by bending a coil spring. When the linear motion of the speed adjusting part 200 is performed by the first and second springs 220 and 240, It is also possible to change the state by force.

In the embodiment of the present invention, a plurality of springs 220 and 240 are provided to allow the speed regulator 200 to change its state with a small force during linear motion. However, It is needless to say that the force for adjusting the speed adjusting unit 200 can be minimized by various means.

The ventilation regulator 300 is integrally formed with the speed regulator 200 and adjusts the degree of opening of the ventilation opening 140 according to the speed of the motor 120 controlled by the speed regulator 200.

That is, when the speed regulating unit 200 is in the high speed position, since the motor 120 rotates at an overspeed, the ventilation hole 140 is opened to the maximum to allow the outside air to flow into the housing 100 to overheat the motor 120 prevent. Accordingly, the ventilation control unit 300 moves to the front of the housing 100 and is positioned at the maximum opening position where the ventilation opening 140 is opened as much as possible.

Conversely, when the speed regulating unit 200 is in the low speed position, the vent 120 may be opened to the minimum because the motor 120 rotates at a low speed. Accordingly, the ventilation control unit 300 moves to the rear of the housing 100 and is positioned at the minimum opening position to open the ventilation hole 140 to the minimum.

At this time, the ventilation control part 300 may be formed in a plate shape and is movable between the maximum opening position and the minimum opening position in such a manner as to partially block the ventilation hole 140 at the high speed position and the low speed position.

Particularly, the ventilation control part 300 is formed integrally with the speed control part 200. Accordingly, the position of the ventilation control unit 300 can be automatically changed through the change of the position of the speed control unit 200. Accordingly, the operator can adjust the ventilation hole 140 according to the rotation speed of the motor 120 without adjusting the ventilation hole 140 separately.

In addition, although the ventilation control unit 300 is formed in a plate shape and may be formed in a spherical shape to surround the rear of the motor 120, the present invention is not limited by the shape of the ventilation control unit 300.

Referring again to FIG. 2, the ventilation control unit 300 includes a plurality of mesh-shaped inflow holes facing the ventilation holes 140 and formed at regular intervals.

The inflow hole 240 allows external air to flow into the housing 100 through the inflow hole 240 even at the maximum opening position or the minimum opening position of the ventilation hole 140. The inflow hole 240 is formed to be smaller than the ventilation hole 140 so that the amount of the inflow air can be adjusted when the outside air is introduced.

4, the number of the inflow holes 240 of the ventilation control unit 300 increases from the maximum opening position to the minimum opening position of the ventilation control unit 300. As shown in FIG. As described above, when the ventilation regulator 300 is at the maximum opening position, the motor 120 rotates at a high speed. At this time, the ventilation control unit 300 is in a state in which the ventilation hole 140 is maximally opened but a part of the ventilation hole 140 is closed. Accordingly, a plurality of inflow holes 240 are formed in order to allow the outside air to sufficiently flow into the housing 100 in a state where a part of the ventilation hole 140 is closed.

Similarly, when the ventilation regulator 300 is at the minimum opening position, the ventilation regulator 300 is the minimum opening position for opening the ventilation opening 140 to the minimum. That is, the ventilation regulator 300 does not completely close the ventilation hole 140 but closes the ventilation opening 140 at a minimum, similar to the maximum opening position. At this time, the number of the inflow holes 240 is decreased as the outer air is directed toward the end of the ventilation control part 300 so that the outside air is minimally introduced into the housing 100. When the ventilation control part 300 is at the minimum opening position, .

Further, as shown in Fig. 5, the plurality of inflow holes 240 may be reduced in size from the maximum open position to the minimum open position.

That is, when the ventilation control unit 300 is at the minimum opening position, the ventilation hole 140 should be opened to the minimum, and air introduced into the housing 100 should be minimized. The size of the inflow hole 240 toward the end of the ventilation control unit 300 may be reduced so that the size of the inflow hole 240 facing the ventilation opening 140 when the ventilation control unit 300 is at the minimum opening position So that it can be opposed to the small inflow hole 240. As a result, it is possible to minimize the amount of air flowing through the air vent 140 and the inflow hole 240.

As described above, in the speed regulating part 200 for regulating the speed of the motor 120 of the power tool 10, the ventilation regulator 200 for regulating the opening size of the vent hole 140 formed in the housing 100 of the power tool 10, The degree of opening of the ventilation hole 140 can be adjusted according to the rotation speed of the motor 120 by installing the ventilation hole 300.

That is, when the speed of the motor 120 is high, the ventilation hole 140 is opened to the maximum to allow the outside air to flow sufficiently into the housing 100. When the speed of the motor 120 is low, The amount of air flowing into the housing 100 can be adjusted according to the rotational speed of the motor 120 by minimizing the amount of the external air introduced into the housing 100 by opening the housing 140 at a minimum.

In addition, since the ventilation control unit 300 is integrally formed with the speed control unit 200, the speed of the motor 120 can be controlled and the opening size of the ventilation hole 140 can be adjusted.

In addition, since the position of the speed adjusting unit 200 is semi-automatically adjusted, the operator using the power tool 10 can adjust the positions of the speed adjusting unit 200 and the ventilation adjusting unit 300 with a small force do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

10: power tool 100: housing
120: motor 140: ventilation hole
200: Speed regulator 300: Ventilation regulator
340: Inflow ball

Claims

1. A power tool comprising: a housing of a power tool having a motor mounted therein and having a vent which communicates with the outside to receive outside air;
A speed regulator capable of moving between a high speed position where the motor rotates at a high speed and a low speed position where the motor rotates at a low speed; And
And a speed adjusting unit that moves between a maximum opening position which is opposed to the speed adjusting unit and which maximally opens the ventilation opening at the high speed position and a minimum opening position which closes the ventilation opening at the low speed position, A ventilation regulator for regulating the opening degree of the ventilation opening;
And an electric motor.

The method according to claim 1,
The air-
And a plurality of mesh-shaped inflow holes facing the vent holes and formed at regular intervals.

The method of claim 2,
Wherein the plurality of inflow holes of the ventilation control unit
And the number increases as the distance from the maximum open position to the minimum open position increases.

The method according to any one of claims 1 to 3,
Wherein the plurality of inflow holes of the ventilation control unit
And the size decreases from the maximum open position to the minimum open position.