JPS583663Y2 - Electric tool - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to power tools such as electric drills and electric screwdrivers.

A power tool uses a motor to drive a tool such as a drill, and is equipped with a switch for starting and stopping the motor.

This switch is connected to an operating lever provided on a grip of a housing that houses the motor, and is opened and closed by operating the lever with a finger or the like.

By the way, there is a conventional power tool in which the direction of rotation of the motor can be switched between forward and reverse directions so that the tool can be rotated forward and reverse.

In this device, a changeover switch for performing the switching operation is provided separately and independently in the housing at a position apart from the operation lever.

Therefore, the changeover switch cannot be operated with the hand holding the grip, and the changeover switch must be operated with another hand.

That is, when performing a forward/reverse switching operation, the conventional procedure of once stopping the motor, operating a changeover switch, and driving the motor again was performed separately, resulting in poor operability and workability.

This becomes a problem especially in tap-setting work where forward/reverse switching operations are performed relatively frequently.

The present invention was developed in view of these circumstances, and is an electric tool that improves operability and workability by allowing forward and reverse switching operations to be performed with one hand holding the grip of the housing. The purpose is to provide the following.

Another objective of the present invention is to improve safety by preventing erroneous forward/reverse switching operations.

An example of the implementation of the present invention will be described with reference to the drawings. The housing a has a split structure, and a grip part 1 is integrally formed in the lower part of the housing a.

The grip part 1 has a first operating lever 2 and a second operating lever 3 protruding from the upper front surface thereof in a vertically parallel manner.

The first operating lever 2 and the second operating lever 3 are each fitted into a mounting lower provided on the grip portion 1 so as to be slidable back and forth, and protrude forward from the opening T.

In each of the levers 2 and 3, the front surface of the protrusion from the lower mounting portion is curved to provide a good feeling when the lever is placed on the lever with a finger.

In addition, at the rear of each lever 2, 3, a rear support 8,
8' and springs 9, 9' are elastically mounted.

These springs 9, 9' urge each lever 2, 3 forward and keep it protruding from the mounting opening T.
, 3 is pushed rearward, each lever 2, 3 is returned to its original position after the pushed state is released.

Then, a forward rotation switch 4 and a reverse rotation switch 5 are respectively attached and fixed on the upper and lower sides of the gripping part 1 in correspondence with the respective levers 2 and 3, and the first operation lever 2 is attached to the forward rotation switch 4, and the second operation lever is attached to the forward rotation switch 4. 3 are connected to the reverse rotation switch 5, respectively.

The forward rotation switch 4 is located at the upper part of the grip part 1, and is connected to the battery 10 at the upper part of the housing a, with an actuator 11 protruding from its lower surface.

The actuator 11 is attached to the forward rotation switch 4 so as to be slidable back and forth and turns the forward rotation switch 4 ON and OFF.
Engage with the upper surface of the operating lever 2.

The reversing switch 5 is located in the lower part of the grip part 1 and connected to the battery 10, and has an actuator 12 protruding from its upper surface.

The actuator 12 is attached to the reversing switch 5 so as to be slidable back and forth and turns the reversing switch 5 ON and OFF.
Engage with the bottom surface of the operating lever 3.

Therefore, the first operation lever 2 is connected to the forward rotation switch 4, and the second operation lever 3 is connected to the reverse rotation switch 5, respectively, and when the first operation lever 2 slides, the forward rotation switch 4 is turned on.

OFF, and the reverse rotation switch 5 is turned off by sliding the second operating lever 3.
is turned on and off.

Therefore, in order to prevent the erroneously operated lever 2 or 3 from sliding when the other lever is erroneously operated while operating one of the levers 2 and 3, the rear part of the intermediate portion of both the levers 2 and 3 is provided. One cam 6 is provided correspondingly.

As shown in FIG. 1, the cam 6 is formed by cutting out the front part of a disc at an appropriate angle to form a straight part, and has abutting and engaging surfaces 13 on the top and bottom of the front surface.
, 13'.

The cam 6 is rotatably supported by a support shaft 14, and a pin 15 is pivotally attached to the rear of the cam 6, and a return spring 17 is hooked across the pin 16 provided at the rear.

Next, the operation of such a power tool will be explained.

When the power tool is operated in the forward direction, first, as shown in FIG. 2, the first operating lever 2 is pushed, and the lever 2 slides rearward.

With this sliding, the actuator that engages with the lever 2 slides rearward, and the forward rotation switch 4 is connected (ON).

Then, the circuit to the battery 10 and the motor 18 is connected, the motor 18 is driven, and the tool drive drive section 19 protruding forward of the housing a rotates in the normal direction.

At the same time, the rear part of the lever 2 contacts the upper abutment and engagement surface 13 of the cam 6, rotating the cam 6 counterclockwise, and lowers the abutment and engagement surface 13' of the cam 6. The edge is close to the second operating lever 3.

Therefore, even if the second operating lever 3 is accidentally pushed during forward rotation, the lever 3 will immediately move to the abutting surface 1 of the cam 6.
3' comes into contact with the lower edge and its backward sliding is prevented, and the reverse rotation switch 5 is not connected (ON).

Next, when the first operation lever 2 is released from the pressed state, the lever 2 automatically returns to its original position due to the elastic force of the spring 9, and the forward rotation switch 4 is turned off, stopping the forward rotation operation.

Further, the cam 6 is rotated by the return spring 17 to return to its original state.

To reverse the power tool, as shown in Fig. 3, when the second operation lever 3 is pushed in the same way as for forward rotation, the actuator 12 that engages with it slides backward, and the reverse switch 5 is connected (ON). ), battery 10 and motor 1
8 is connected, the motor 18 is driven, and the drive unit 19 is reversed.

At the same time, the rear part of the lever 3 abuts against the abutting engagement surface 13' of the cam 6, causing the cam 6 to rotate clockwise.
The upper edge of the abutting and engaging surface 13 of the cam 6 is close to the first operating lever 2 .

Therefore, even if the first operating lever 2 is pushed by mistake during reverse rotation, the lever 2 will come into contact with the upper edge of the abutment engagement surface 13 of the cam 6 and will be prevented from sliding backwards, and the forward rotation switch will be prevented from sliding backwards. 4 is never connected (ON).

Next, when the pressed state of the second operating lever 3 is released, the lever 3 automatically returns to its original position due to the elastic force of the spring 9', the reverse rotation switch 5 is turned off, the reverse rotation operation is stopped, and the cam 6 is rotated by the return spring 1T. and return to its original state.

In the above embodiment, springs 9, 9' are used as return means for returning the first and second operating levers 2.3 to their original states.
is shown, but it goes without saying that the invention is not limited to this.

Furthermore, although the springs 9 and 9' are directly engaged with the respective levers 2 and 3, they may be engaged indirectly through separate members.

As explained above, the present invention is to easily and quickly perform forward/reverse switching operations by operating the first and second operating levers with one hand holding the grip of the housing. This is extremely effective, especially when forward/reverse switching work is frequently performed, such as tap-setting work, and operability and workability can be improved.

In addition, a cam is provided inside the grip that prevents the other operating lever from being pushed when one operating lever is pushed.
Even if one control lever is operated incorrectly while the other control lever is operated, that operation will be prohibited, and both the forward and reverse rotation switches will not be connected at the same time, preventing damage such as short circuits in the electric circuit, and ensuring safety. can improve sex.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the power tool of the present invention with one side of the housing removed, and FIGS. 2 and 3 are front views showing the operating state of the main parts. In the figure, a...Using, 1...Gripping part, 2...
...First operating lever, 3...Second operating lever, 4...
・Forward rotation switch, 5...Reverse rotation switch, 6...Cam, 10...Battery, 18...Motor 9,9
′...Spring (returning means).

Claims (1)

[Scope of utility model registration request] A grip part is integrally formed in the lower part of the housing that accommodates the motor, and a first operating lever and a second operating lever are provided vertically in parallel on the front surface of the grip part, and inside the grip part are both the aforementioned operating levers. In response to A cam that connects the switch to the second operating lever and is located behind both of the operating levers to prevent the other from being pushed when one of the operating levers is pushed, and a cam that releases each operating lever from its pressed state. A power tool that is equipped with a return means for returning to its original state when it is damaged.