JP2515937Y2 - Electric tool - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a power tool, and increases the amount of power supplied to a motor for driving a work piece at any time so that the work piece can be strongly driven as needed. It was done.

(Prior Art) An electric power tool for screwing, drilling, and the like is designed to perform a desired work operation while driving a work body provided in a main body by a motor.

(Problems to be solved by the invention) By the way, in the case of performing the work operation as described above, there are cases where it is desired to drive the work body stronger than usual. In such a case, for example, at the end of screwing, when performing retightening for strongly screwing the screw into the target object, or when strongly screwing into the target object and strongly turning the rusted screw backwards to remove from the target object, Alternatively, it is a case where a hard object such as a knot of timber is drilled.

However, the conventional electric power tool has a problem that the driving force of the work body is constant, and the power tool is strongly driven at any time to cope with the above case.

Therefore, an object of the present invention is to provide an electric tool capable of strongly driving a work piece at any time so as to cope with the above case.

(Means for Solving the Problem) For this purpose, the present invention provides a workpiece 10 provided on the main body 1.
In a power tool driven by a motor M, a drive electric circuit for the motor M is provided with a switching circuit 19 for the amount of power supplied to the motor M, and a wall surface of the power tool is
The switching circuit 19 is provided with a switching operation button 4 for increasing the power supply amount, and the button 4 is of a normally open type having an operating direction on the same axis N as the axial direction of the workpiece 10. It was done.

(Operation) In the above configuration, in order to perform the additional tightening, the workpiece 10
When it is desired to strongly drive, the operation button 4 is pressed.
Then, the amount of power supplied to the motor M increases, and the workpiece 10 is strongly driven while being pressed toward the workpiece.

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a power tool in use, in which 1 is a rod-shaped main body, and a workpiece on which a screw 20 is turned at the tip thereof.
10 is attached detachably. A grip portion 2 is vertically provided at a rear portion of the main body portion 1, and a power supply unit 3 is detachably attached to a lower portion thereof.

FIG. 2 shows a cross section of the main part, in which the motor M for driving the workpiece 10 is housed in the main body 1.
A push-type operation button 4 is provided on the rear end surface. Reference numeral 5 is a switch body provided on the inner surface thereof. The operation button 4 is provided on the same axial center line N as the main body 1 and the workpiece 10 and is a so-called normally open type pressing type that maintains the switch body 4 in an open state by a spring force. When the operation button 4 is strongly pressed with the fingertip, the workpiece 10 is pressed against the workpiece and the switch 5 is activated to change the power supply amount.

A plurality of rechargeable batteries 6 are housed inside the power supply unit 3. One of the plurality of rechargeable batteries 6 is an auxiliary rechargeable battery, the details of which will be described later. On the front of the grip 2,
A push type power switch button 7 is mounted, and when the switch button 7 is pushed, the switch body 8 is turned on and the motor M is driven. Reference numeral 9 is a lead wire for connecting the rechargeable battery 6 and the motor M, and 11, 12, 13 are contact terminals.

FIG. 3 shows an electric circuit for driving the motor M. As shown in the drawing, a plurality of rechargeable batteries 6 (6a, 6a ...
() Is connected in series with each of the buttons 4 and 7, and separately from this, one auxiliary rechargeable battery 6b is connected via the diode 15. Reference numerals 17 and 18 are current adjusting resistors. In the operation button 4, the switch body 4 is opened by a spring, and therefore the rechargeable batteries 6a, 6a ...
When it is pressed, it is connected to the terminal b on the rechargeable battery 6b side, and all the rechargeable batteries 6a to 6b are connected in series. In this way, when connected to the normal terminal a,
When only the electric power of one of the rechargeable batteries 6a, 6a ... Is supplied to the motor M and connected to the terminal b, the rechargeable batteries 6a, 6a.
The power of the other rechargeable battery 6b is added to the power of the other to increase and the power is supplied to the motor M, and the rotational force of the motor M increases to increase the workpiece.
10 drives strongly. That is, the operation button 4 and the rechargeable battery 6b are
A switching circuit 19 for switching the amount of power supplied to the motor M is configured, and the operation button 4 is a switching operation button.

Reference numeral 16 is a charging adapter, and when charging is performed, the operation button 4 is connected to the terminal a on the rechargeable batteries 6a, 6a ... Side, and the adapter 16 is connected to the power supply unit 3. Then, the charging current flows to both the rechargeable batteries 6a, 6a ... Side and the rechargeable battery 6b side to charge all the rechargeable batteries 6a to 6b at the same time.

This electric tool has the above-described structure. For example, when screwing in the screw 20, the grip 10 is held, the workpiece 10 is engaged with the screw 20, and the power switch button 7 is operated. Normally, the operation button 4 is turned on the side of the terminal a, so that the motor M is supplied with power from the rechargeable batteries 6a, 6a ..., The workpiece 10 rotates, and the screw 20 is screwed. When the final tightening is performed, the operation button 4 is turned on to the terminal b side, and the motor M receives the power of the rechargeable batteries 6a, 6a ...
The electric power of b is added and supplied, the workpiece 10 is strongly driven, and the screw 20 is strongly screwed. In this case, if the operation button 4 is strongly pressed with a fingertip, the main body 1 is pushed backward and
The 10 is squeezed against the screw 20 so that the workpiece 10 can be screwed in tightly without the work piece 10 deviating from the head of the screw 20.

FIG. 4 shows another embodiment of the electric circuit,
The resistor 18 is provided on the adapter 16 side. Also in this case, when the adapter 16 is connected to the power supply unit 3, all the rechargeable batteries 6a to 6b are charged at the same time. The operation button 4 is provided on the power supply unit 3 side so that it can be used even if the main body 1 is not provided with such a switch. When using, operate the operation button 4 as needed to
Alternatively, by switching and connecting to the terminal b, the motor M
It is possible to control the amount of power supplied to.

In the electric circuit shown in FIG. 5, a diode 21 is provided in parallel with the operation button 4. Normally, the operation button 4 is off, and in this state, the motor M is supplied with power by subtracting the voltage drop (for example, 1 V) due to the diode 21.
When the operation button 4 is turned on, both ends of the diode 21 are short-circuited, the rechargeable battery 6 is entirely supplied to the motor M, and the workpiece 10 is strongly driven. Various means for controlling the amount of power supplied to the motor M in this manner are conceivable.

Further, in each of the above embodiments, the auxiliary rechargeable battery 6b for increasing the power supply amount is configured to be inserted in series with the main rechargeable battery 6a.
It is also possible to connect the main rechargeable battery 6a and a spare rechargeable battery 6b having the same voltage (in this case, the capacity may be small) in parallel to capture the voltage drop when the main rechargeable battery 6a is under heavy load. is there.

(Effects of the Invention) As described above, according to the present invention, in the electric tool in which the workpiece 10 provided in the main body 1 is driven by the motor M, the electric motor circuit for driving the motor M is provided with the motor. A switching circuit 19 for switching the amount of power supplied to M is provided, and an operation button 4 for switching the switching circuit 19 to increase the amount of power supply is provided on the wall surface of the power tool, and the button 4 is arranged in the axial direction of the workpiece 10. Since it is a normally open pressing type that has an operating direction on the same axis N as the above, A. By operating the switching operation button, the amount of power supplied to the motor M is increased in a timely manner, and if necessary, the workpiece. Can be driven strongly.

In addition to the effect of improving the operability by one-touch switching of the driving force, the operating direction of the switching operation button is set on the same axis as the axial direction of the workpiece, so B. When pressing the switching operation button, the workpiece is pressed. It is possible to prevent the shaft from shaking.

In addition, since the switching operation button is of the normally open type, C. Normally, the optimum driving force is set for normal work, so apologize for excessive driving force. It can be prevented from being added to the work piece and can be used only when a strong driving force is required.

This has the operational effect of:

Also, since the button is set in the direction to push toward the work piece (and in the same axis), it is consistent with the action taken by the user when driving power is required for general electric tools. (For example, if it is an electric screwdriver, when the screw is hard, push it so that the screw thread does not collapse, and if it is an electric drill, push the tool itself in order to apply the propulsive force by the rotating force of the drill) Not only is it possible to avoid the dispersion of force over time, but it is also possible to make an intuitive judgment based on the appearance of the user's intentions, and it is possible to make full use of this even for unfamiliar users.

That is, the effect is obtained.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of an electric power tool, FIG. 2 is a sectional view of an essential part, FIG. 3, FIG.
FIG. 5 is an electric circuit diagram. 1 ... Main body 4 ... Operation button 10 ... Workpiece 19 ... Switching circuit M ... Motor

Claims (1)

(57) [Scope of utility model registration request] 1. A power tool in which a work body 10 provided in a main body 1 is driven by a motor M, and a circuit 19 for switching the amount of power supplied to the motor M in a drive electric circuit of the motor M. And a switching operation button 4 for switching the power supply amount of the switching circuit 19 to the side where the power supply amount is increased on the wall surface of the power tool, and the button 4 is operated on the same axis N as the axial direction of the workpiece 10. A power tool characterized by a unidirectional normally open type pressing type.