JP3248296B2 - Impact tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact wrench or the like for tightening or removing screw parts.
G tool .

[0002]

2. Description of the Related Art A conventional impact wrench is disclosed in
As disclosed in Japanese Patent Publication No. 44456, a main body portion including a motor portion of a driving source, a gear portion for reducing the rotation of the motor portion, and an impact mechanism portion is provided, and a handle portion is provided at a center of gravity of the main body portion. There is a T-shaped impact wrench located.

[0003]

Problems to be Solved by the Invention
In the T-shaped impact wrench disclosed in the above publication, a motor of a drive source, a gear for reducing the rotation of the motor, and an impact mechanism for rotating and hitting a tip tool are formed on the body of the main body. Because the main body is long, the working range is limited, and it is impossible to tighten and remove screws in a narrow place. Therefore, a short impact wrench of the main body is required.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and to achieve a small impact with excellent operability and workability.
Is to provide tools .

[0005]

SUMMARY OF THE INVENTION The above object is achieved by a housing
And a motor for transmitting the rotational power of the motor.
Gear mechanism and the rotational power from the gear mechanism
Are arranged at a position orthogonal to the rotation axis of the motor.
An output shaft, a hammer arranged on the output shaft so as to be able to move back and forth,
The transmission of the striking force and rotational force generated by the hammer
Impact tool with a built-in
It has a gear to which the rotational power from the gear mechanism is transmitted, and
The rotation axis of the motor is located between the car and the anvil
Is achieved by

[0006] The above object is also achieved by a housing accommodated in a housing.
Motor for transmitting rotation power of the motor
The rotational power from the structure and the gear mechanism is transmitted and the motor
An output shaft arranged at a position orthogonal to the rotation axis of the
A hammer that can be moved back and forth on the output shaft and a hammer
And the anvil to which the rotating force is transmitted.
Equipped with an impact tool, on the side opposite to the output shaft of the motor.
A power supply for supplying power to the motor, and
Controls the power supply to the motor at a position approximately halfway with the force axis
Providing an operation unit for opening and closing the switch
More achieved.

The rotation transmission method for tightening and removing the screw of the impact tool constructed as described above is performed by pulling a lever and opening / closing a switch so that the rotation of the motor causes the speed change gear, bevel gear, impact mechanism part to rotate. It is transmitted to the tip tool via the anvil. In the rotation direction switching method, the power supply circuit is switched to change the rotation direction by moving the position of the rotation direction switching lever mounted on the switch to the position in the reverse rotation direction.

[0007]

[Embodiment] As an impact tool in this embodiment,
For example, description will be made using the impact wrench shown in FIGS.
You. FIG. 1 is a sectional view showing an impact wrench according to this embodiment.
2, FIG. 2 is a bottom view of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG.
FIG.

1 to 3, in a housing 1
Is for transmitting the rotational power of the motor 6 to the motor 6.
A gear mechanism comprising a reduction gear 7 and a bevel gear 8
Through the gear 12 meshing with the bevel gear 8 of the gear mechanism section of FIG.
The rotation power of the motor 6 is transmitted and the rotation
And the output shaft 13 arranged at a position orthogonal to
It is arranged on the force shaft 13 so as to be able to move back and forth, and the rotation of the motor 6
A hammer 9 that converts the force into a striking force, and the hammer 9
The generated striking force and the rotational force from the output shaft are transmitted.
And has a tool holding portion for holding the tip tool 10.
An anvil 11 is accommodated. In addition, impact
The impact mechanism of the punch comprises a hammer 9 and an anvil 11
It is composed of Also, the counter output of the motor 6
A motor is provided at one end of the housing 1 located on the shaft 13 side.
6 can be inserted and mounted in the rotation axis direction and
A power supply unit 2 such as a battery for supplying is provided. Ma
A motor is provided at a substantially intermediate position between the power supply unit 2 and the output shaft 13.
The switch 4 for controlling the power supply to 6 is opened and closed
Operating section 5 is provided, and the operating section
5 is disposed between the power supply unit 2 and the motor 6 and has an operation unit 5
Is provided on the power supply unit 2 side. In addition,
The switch 4 has a switching unit that can change the rotation direction of the motor 6.
The switching unit 3 is provided outside the housing 1.
It is configured so that the user can operate it along the circumference.
Have been. It should be noted that the above substantially intermediate position is for the user.
Position where the impact wrench body is easy to grip
It is a position where the wrench body is easy to operate,
An operation unit 5 that can be reliably operated with a light force
Is very effective in improving workability and operability.
It is a result. Also, transmitting the rotational power to the output shaft 13
Between the gear 12 and the anvil 11
By arranging so that the rotation axis is located, the impact
Reduce the height of the wrench body in the direction of the output shaft 13
Can reduce the size of the impact wrench body
To improve operability and workability in narrow spaces.
You.

Next, the impact tray constructed as described above is used.
How to use the punch will be described. First, tighten the screws
When performing work, the operation unit 5 is operated based on the fulcrum A.
To open and close the switch 4 to supply power to the motor 6
You. When power is supplied to the motor 6, rotational power is generated,
The reduction power 7 and the beveled tooth of which the rotational power constitutes a gear mechanism portion
It is transmitted to the car 8. Then, the bevel gear 8 is used to
The rotational power is at a position orthogonal to the rotation axis of the motor 6.
It is transmitted to the output shaft 13 disposed via the gear 12.
At the same time, if a predetermined torque or more is applied during screw tightening,
The torque mechanism 9 converts the rotational force into a striking force. this
On the tip tool 10 attached to the anvil 11
It is possible to tighten the screw by applying the rotating force and the hitting force described above.
it can.

[0010] When loosening the screws,
Variable rotation direction of motor 6 connected to switch 4
Operating the switching unit 3 to select the reverse mode from the forward mode.
And perform the same operation as during the tightening work described above.
And hit until it overcomes the fastening force of the screw being tightened
When the tightening force decreases due to the action, the screw
Can be removed.

[0011]

According to the present invention , the gear mechanism is provided on the output shaft.
Gears to which the rotational power from the
The rotation axis of the motor is located between
The size of the tool can be reduced,
Workability can be improved .

Further , according to the present invention, a counter-output shaft of a motor is provided.
Side, a power supply unit for supplying electric power to the motor is provided.
Controls the power supply to the motor at a position approximately intermediate to the output shaft.
Providing an operation section for opening and closing the switch
To improve the operability and workability of impact tools.
Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of an impact wrench according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

1 is a housing, 2 is a power supply unit (battery) , 3 is a switching unit , 4
Is a switch, 5 is an operation unit , 6 is a motor, 7 is a reduction gear,
8 is a bevel gear, 9 is a hammer , 10 is a tip tool, 11 is an anvil , 12 is a gear, and 13 is an output shaft .

Continuation of the front page (56) References JP-A-6-182674 (JP, A) JP-A 58-106149 (JP, U) JP-A 1-132370 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B25B 21/02

Claims (4)

(57) [Claims] A motor housed in a housing;
Gear mechanism for transmitting rotational power of the motor, and the gear
The rotation power from the mechanism is transmitted and the rotation of the motor
An output shaft arranged at a position orthogonal to the shaft, and the output shaft
A hammer arranged to be able to move back and forth on the
And an anvil to which the generated striking force and rotational force are transmitted.
In the impact tool, the gear machine is mounted on the output shaft.
It has a gear to which the rotational power from the structure is transmitted, and the gear and
The rotation axis of the motor is located between the anvil and the motor
Impact tool characterized by that. 2. A motor housed in a housing and said motor.
Gear mechanism for transmitting rotational power of the motor, and the gear
The rotation power from the mechanism is transmitted and the rotation of the motor
An output shaft arranged at a position orthogonal to the shaft, and the output shaft
A hammer arranged to be able to move back and forth on the
And an anvil to which the generated striking force and rotational force are transmitted.
Impact tool on the side opposite to the output shaft of the motor
A power supply unit for supplying power to the motor,
A power supply to the motor is provided at a substantially intermediate position between the power source unit and the output shaft.
Operation for opening and closing the switch that controls power supply
Impact tool characterized by providing a part. 3. The power supply unit and the motor are connected to the operation unit.
And the fulcrum of the operation section is provided on the power supply section side.
3. The impact tool according to claim 2, wherein the impact tool is provided. 4. The switch on the outer periphery of the housing.
Connected to the motor and capable of changing the rotation direction of the motor
3. The impact according to claim 2, wherein a portion is provided.
tool.