JPH0727097Y2 - Electric tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electric power tool, and more particularly to an electric power tool capable of switching between forward and reverse rotation.

[Prior Art] FIG. 7 shows a conventional electric tool, in which a drive motor 2 is disposed inside a pistol-shaped tool body 1, and an output pinion 3 of the drive motor 2 is provided. The transmission gear 4 is meshed. External teeth formed on a spindle shaft 5 are meshed with the transmission gear 4, and a chuck 7 for adhering a desired rotary tool to the tip end portion of the spindle shaft 5 via a ball clutch mechanism 6. Are connected.

A switch body 8 is housed inside the tool body 1 below the drive motor 2, and a battery 9 for supplying power to the drive motor 2 is attached to and detached from the lower end portion of the tool body 1. It is installed freely.

Further, the tool body 1 has an O
A trigger switch 10 for performing N and OFF operations is attached. Above the trigger switch 10 of the tool main body 1, as shown in FIG. 8, a forward / reverse rotation switching lever 11 has a tip portion 11a thereof. It is arranged so as to protrude from the tip of the trigger switch 10. This forward / reverse rotation switching lever 11 is
It is rotatable around the pivot pin 12 near the rear end thereof, and as shown in FIG. 9, it is located at a position corresponding to the rear end of the forward / reverse rotation switching lever 11 of the tool body 1. Positioning projections 13 for positioning the forward / reverse rotation switching lever 11 at predetermined forward and reverse rotation positions are formed. Further, a notch 14 engaged with the positioning protrusion 13 is formed at the rear end of the forward / reverse rotation switching lever 11, and the switch is provided near the rear end of the forward / reverse rotation switching lever 11. An engagement hole 16 for engaging the forward / reverse rotation switching pin 15 of the main body 8 is formed.

In the conventional electric power tool, the operator holds the tool body 1 and puts his / her finger on the trigger switch 10 and pulls the trigger switch 10 to turn on the switch body 8, and the switch body 8 is turned on. The drive motor 2 is rotationally driven by an output signal from. Then, by decelerating and transmitting the rotational force of the drive motor 2 to the spindle shaft 5 via the output pinion 3 and the transmission gear 4,
The tool mounted on the chuck 7 is rotated to perform desired processing.

Then, the operator rotates the forward / reverse rotation switching lever 11 to operate the forward / reverse rotation switching pin 15 engaged with the engagement hole 16, whereby the switch body 8 is moved forward / reversely. A switching operation is performed to switch the rotation direction of the drive motor 2.

Further, as an electric tool capable of switching between forward and reverse rotation, there is also an electric tool described in JP-A-1-246083. In this, the first trigger type switch for turning on / off the power supply to the motor and the second trigger type switch for switching the rotation direction of the motor are arranged in close proximity to each other, and the second trigger type switch is automatically reset. It is a thing.

[Problems to be solved by the device]

However, in the former of the conventional power tools, the trigger switch is used when the forward / reverse rotation switching lever 11 is rotated.
Since the tip portion 11a of the forward / reverse rotation switching lever 11 is arranged so as to project from the tip portion of the trigger switch 10 so that 10 does not get in the way, the operator grips the tool main body 1, Since the forward / reverse rotation switching lever 11 cannot be rotated by the operation of the finger, it is necessary to operate the forward / reverse rotation switching lever 11 by using the other hand. Rotation switching operation becomes complicated,
It has a problem of extremely poor usability.

Further, since the forward / reverse rotation switching lever 11 is formed to be relatively slender and the distance from the pivot pin 12 which is the center of rotation to the tip portion 11a of the forward / reverse rotation switching lever 11 is long, There is a problem that the forward / reverse rotation switching lever 11 is easily damaged at the time of dynamic operation, and the reliability of the device is significantly lowered.

In the latter one disclosed in Japanese Patent Laid-Open No. 1-246083, the first trigger type switch and the second trigger type switch are arranged side by side so that they can be operated with the same finger-holding method. Since the position where the finger is applied is close, and when the first trigger type switch is pulled and operated, the second trigger type switch is mistakenly pulled and suddenly changed from forward rotation to reverse rotation. There is a risk of switching. Therefore, it is very dangerous, and the motor is overloaded, which adversely affects the durability. In addition, when holding in either forward or reverse rotation, it is necessary to always press the second trigger type switch in addition to the first trigger type switch, so not only the switch operation but also the tool operation. Is extremely troublesome.

The present invention has been made in view of the above points, and an object thereof is to provide an electric tool in which the forward / reverse rotation switching lever can be easily operated with one hand and the reliability of the device can be improved. To do.

[Means for Solving the Problems]

In order to achieve the above object, the electric power tool according to the present invention comprises a drive motor 2 for rotating and driving a desired tool through a gear reduction mechanism inside the tool body 1. 2 is provided with a trigger switch for performing ON / OFF operation, and a forward / reverse rotation switching lever 11 for switching forward / reverse rotation of the drive motor 2 is provided near the trigger switch 10 of the tool body 1 as a shaft support pin. In an electric tool rotatably arranged around a center 12, both side portions near the center of rotation of the forward / reverse rotation switching lever 11 are exposed from both side portions of the tool body 1.

[Action]

According to the present invention, when the operator holds the tool body 1 and presses the exposed portion of the forward / reverse rotation switching lever 11 forward with the finger F, the forward / reverse rotation switching lever 11 is pressed.
Since it can be rotated, the forward / reverse rotation switching lever 11 can be easily rotated with one hand, and once switched, the state can be maintained even if the finger is released. It is possible to improve the usability.

Further, since both side portions near the center of rotation of the forward / reverse rotation switching lever 11 are exposed from both side portions of the tool body 1, the exposed portion is pressed forward of the tool body 1 to rotate forward / reversely. The switching operation of the switching lever 11 is performed. The switching operation of the forward / reverse rotation switching lever 11 is performed by the trigger switch 10
Is different from the pulling operation of the finger F, and the direction in which the force is applied by the finger F is also different. Therefore, the forward / reverse rotation switching lever 11 may be erroneously operated while pulling the trigger switch 10. There is no inconvenience. Therefore, safe work is possible and the drive motor 2 is not overloaded.

Further, since the operation position of the forward / reverse rotation switching lever 11 is near the shaft support pin 12, it is possible to prevent the forward / reverse rotation switching lever 11 from being damaged at the time of the turning operation. It is possible to significantly improve the sex.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

1 to 4 show an embodiment of an electric power tool according to the present invention, in which the inside of the pistol-shaped tool body 1 is
A drive motor 2 is provided, and a substantially cylindrical gear case 17 is provided inside the tool body 1 on the output end side (front side) of the drive motor 2 with respect to the inner surface of the tool body 1. Are arranged so as to have a predetermined interval. The output pinion 3 of the drive motor 2 is meshed with a plurality of planetary gears 18 constituting the first stage planetary reduction mechanism, and each of the planetary gears 18 is provided on one side of a planet holding plate 19. It is rotatably supported by a shaft 20 formed in a protruding manner. A sun gear 21 of a second stage planetary reduction mechanism is integrally formed on the other surface side of the planet holding plate 19, and each planet gear 18 is formed on the inner surface of the gear case 17. The internal gear 22 is meshed.

Further, the second stage sun gear 21 has a plurality of planetary gears 25 rotatably supported by a shaft 24 of a second stage planetary holding plate 23.
Are meshed with each other, external teeth 23a are formed on the outer peripheral portion of the planet holding plate 23, and the sun gear 26 of the third stage planetary reduction mechanism is formed on the other side of the planet holding plate 23. Are integrally formed.

In addition, the third stage sun gear 26 includes a plurality of planetary gears.
27 are meshed with each other, and on the outside of each planetary gear 27,
An internal gear 28, which is in a stationary state in contact with the gear case 17, is arranged, and the internal gear 28 and the planet gear 27 mesh with each other. Further, a planet holding plate 29, which is driven to rotate integrally with each planet gear 27, is connected to each planet gear 27 by a shaft 30. Inside the planet holding plate 29, a spindle shaft 5 is formed. The external teeth 5a thus formed are spline-engaged. further,
A chuck 7 for mounting a desired tool is connected to the front end portion 5b of the spindle shaft 5.

Further, an annular holding ring 31 made of a material having a spring property is disposed between the tool body 1 and the gear case 17 so as to be movable in the axial direction. A slide lever 32 is integrally formed so that an operation portion is exposed from the upper surface of the tool body 1 to the outside. Also,
Guide pins 33 are formed on both sides of the retaining ring 31 so as to project therefrom. The guide pins 33 are formed in both sides of the gear case 17 and extend in the axial direction.
It is adapted to be inserted into the inside of the gear case 17 by penetrating therethrough.

Inner teeth meshed with the planetary gear 25 are formed inside the gear case 17 and at positions corresponding to outer portions of the planetary gear 25 meshed with the second stage sun gear 21. A slide gear 35 is disposed so as to be movable in the axial direction, and a guide pin 33 of the holding ring 31 is fitted and slid in an annular recess 35c formed over the entire circumference of the slide gear 35. The gear 35 is rotatable. further,
A locking projection 36 is formed near the inner teeth 22 of the gear case 17, and a locking recess 37 that is engaged with the locking projection 36 is formed on the outer periphery of the slide gear 35. There is. The holding ring 31 is moved in the axial direction by operating the slide lever 32 back and forth, and the movement of the holding ring 31 causes the guide pin 33 fitted in the annular recess 35c of the slide gear 35. Is the guide hole of gear case 17
The slide gear 35 is moved along 34, whereby the slide gear 35 is moved. Then, when the slide gear 35 moves to engage the locking recess 37 of the slide gear 35 with the locking projection 36 of the gear case 17,
The slide gear 35 does not rotate and becomes stationary, and the planetary gear 25 is rotationally driven at a low speed. on the other hand,
The slide gear 35 moves forward, the engagement recess 37 of the slide gear 35 is disengaged from the engagement projection 36, and the slide gear 35 becomes rotatable.
By engaging the inner teeth of and the outer teeth 23a of the planet holding plate 23, the slide gear 35, the planet holding plate 23, and the sun gear 21 rotate integrally, and the planetary gear 25 rotates at high speed. (State of FIG. 1).

Further, as shown in FIG. 1, a switch body 8 for controlling the motor 2 is accommodated below the drive motor 2 inside the tool body 1, and a lower end portion of the tool body 1 is provided at a lower end portion thereof. A battery 9 for supplying power to the drive motor 2 is detachably mounted.

Further, in the tool body 1, the switch body 8 is turned on,
A trigger switch 10 for performing an OFF operation is attached, and a forward / reverse rotation switching lever for switching the rotation direction of the motor 2 is provided above the trigger switch 10 of the tool body 1.
11 are provided. The forward / reverse rotation switching lever 11 is rotatable about a shaft support pin 12 at a substantially central portion thereof.
The operation protrusions 38 protruding from both sides of the tool body 1 are integrally formed. In the present embodiment, when the operator of the tool body 1 holds the tool body 1, the second
As shown in the drawing, the forward / reverse rotation switching lever 11 can be rotated around the pivot pin 12 by pushing the portion of the operation protrusion 38 forward with the finger F. ing. Further, a notch 14 for stopping the forward / reverse rotation switching lever 11 at a predetermined forward rotation position and reverse rotation position respectively is formed at the rear end portion of the forward / reverse rotation switching lever 11. Rotation switching lever
An engaging hole 16 for engaging the forward / reverse rotation switching pin P of the switch body 8 is formed at the rear end of the switch 11 (FIG. 3, FIG.
(Fig. 4).

Next, the operation of this embodiment will be described. First, when using a tool by low speed rotation, slide lever 32
1 is operated to the left in FIG. 1 to move the slide gear 35 rearward, whereby the locking recess 37 of the slide gear 35 is
Is engaged with the locking projection 36 of the gear case 17 to hold the slide gear 35 in a non-rotating state.

In this state, the operator holds the tool main body 1 and puts his / her finger on the trigger switch 10 and pulls the trigger switch 10 to turn on the switch main body 8 and a signal from the switch main body 8 The drive motor 2 is rotationally driven. Then, by decelerating and transmitting the rotational force of the drive motor 2 to the spindle shaft 5 via the output pinion 3, the planetary gears 18, 25, 27, the sun gears 21, 26, etc., the chuck 7 is mounted. The tool is rotated to perform the desired processing. At this time, since the slide gear 35 is fixed in the non-rotating state, the second stage planetary gear 25 is rotated while meshing with the internal teeth of the fixed slide gear 35, and the reduction ratio is reduced. Getting higher,
The spindle shaft 5 is rotationally driven at a low speed.

When the tool is used by rotating at high speed, the slide lever 32 is operated to the right in FIG.
By moving 35 forward, the slide gear 35
The engaging recess 37 of the gear case 17 is disengaged from the engaging protrusion 36 of the gear case 17, and the inner teeth of the slide gear 35 and the outer teeth 23a of the planet holding plate 23 are engaged with each other, whereby the slide gear 35, the planet holding plate 23, and the sun. The gear 21 is integrated with the gear 21 to hold the slide gear 35 in a rotatable state.

In this state, when the operator pulls the trigger switch 10, the drive motor 2 is rotationally driven, and the spindle is passed through the output pinion 3, the planetary gears 18, 25, 27, the sun gears 21, 26, etc. The shaft 5 is driven to rotate. At this time, since the slide gear 35 is rotatable, the slide gear 35 together with the second stage planetary gear 25
Since 35 is rotated, the reduction ratio is reduced, and the spindle shaft 5 is rotationally driven at high speed. By operating the slide lever 32, low speed rotation and high speed rotation can be easily switched. it can.

Further, the operator presses the portion of the operation protrusion 38 with his / her finger to rotate the forward / reverse rotation switching lever 11, and thereby the forward / reverse rotation switching pin engaged in the engagement hole 16. P is operated, whereby the switch body 8 is switched between forward and reverse operations, and the rotation direction of the drive motor 2 is switched.

Therefore, in this embodiment, the forward / reverse rotation switching lever 11 is provided above the trigger switch 10 of the tool body 1, and the operation protrusion 38 formed on both sides of the tip of the forward / reverse rotation switching lever 11 is provided. By pressing forward,
Since the forward / reverse rotation switching lever 11 can be rotated, the operator can easily rotate the forward / reverse rotation switching lever 11 with his / her finger F while holding the tool body 1. It is possible to improve the usability. Further, it is not necessary to form the forward / reverse rotation switching lever 11 in such a long dimension as to project from the trigger switch 10 by the operation protrusion 38, and moreover, the shaft support pin 12 at the substantially central portion of the forward / reverse rotation switching lever 11 can be formed. Since it is rotated about the center, it is possible to prevent the forward / reverse rotation switching lever 11 from being damaged during the rotating operation.
The reliability of the device can be significantly increased.

Further, FIG. 5 shows another embodiment of the present invention, in which the forward / reverse rotation switching lever 11 is formed in a disk shape, and the outer peripheral portion of the forward / reverse rotation switching lever 11 is on the tool body 1 side. Exposed from the department. Further, the forward / reverse rotation switching lever 11 is a shaft support pin.
The notch 14 and the engaging hole 16 are formed in the forward / reverse rotation switching lever 11, respectively.

FIG. 6 shows still another embodiment of the present invention, in which operation protrusions 38 are integrally formed on both sides of the center of rotation of the forward / reverse rotation switching lever 11 by the shaft support pin 12. is there.

In any of the above-described embodiments, the operator pushes the outer peripheral portion of the forward / reverse rotation switching lever 11 or the operation protrusion 38 portion forward with his / her finger F to rotate the forward / reverse rotation switching lever 11. As a result, the rotation direction of the drive motor 2 can be switched between the forward rotation direction and the reverse rotation direction.

Therefore, in any of the above-described embodiments, the forward / reverse rotation switching lever 11 can be easily rotated, and the usability can be remarkably improved. Can be prevented from being damaged, and the reliability of the device can be significantly improved.

[Effect of device]

As described above, according to the present invention, when the operator holds the tool body, the operator pushes the exposed portion of the forward / reverse rotation switching lever forward with his / her finger to rotate the forward / reverse rotation switching lever. Since it can be moved dynamically, the forward / reverse rotation switching lever can be easily rotated with one hand, and once switched, the state can be maintained even if the finger is released. The usability of can be significantly improved.

Further, both side portions in the vicinity of the rotation center of the forward / reverse rotation switching lever are exposed from both sides of the tool body, and the exposed portion is pressed forward of the tool to perform the switching operation of the forward / reverse rotation switching lever. Therefore, the switching operation of the forward / reverse rotation switching lever is different from the pulling operation of the trigger switch in the way of applying the finger and the direction in which the force is applied with the finger. The inconvenience of operating the switching lever does not occur. Therefore, safe work is possible and the motor is not overloaded.

Further, since the operation position of the forward / reverse rotation switching lever is in the vicinity of the shaft support pin, it is possible to prevent the forward / reverse rotation switching lever from being damaged during the turning operation, and the reliability of the device is remarkably improved. Can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a bottom view of a forward / reverse rotation switching lever portion of FIG. 1, and FIGS. 1 is a plan view and a side view of the forward / reverse rotation switching lever of FIG. 1, FIG. 5 is a bottom view of the forward / reverse rotation switching lever portion showing another embodiment of the present invention, and FIG. 6 is still another embodiment of the present invention. FIG. 7 is a bottom view of a forward / reverse rotation lever portion showing an example, FIG. 7 is a longitudinal sectional view showing a conventional electric tool, FIG. 8 is a bottom view of the forward / reverse rotation switching lever portion in FIG. 7, and FIG. It is a plane structure figure of the forward / reverse rotation switching lever part of the figure. 1 ... Tool body, 2 ... Drive motor, 5 ... Spindle shaft, 7 ... Chuck, 8 ... Switch body, 10 ... Trigger switch, 11 ... Forward / reverse rotation switching lever, 12 ... Shaft support pin , 17 …… Gear case, 18,25,27 …… Planet gear, 21,26
...... Sun gear, 29 …… Planet holding plate, 31 …… Holding ring,
32 …… Slide lever, 33 …… Guide pin, 34 …… Guide hole, 35 …… Slide gear, 36 …… Locking protrusion, 37 …… Locking recess, 38 …… Operation protrusion.

Claims (1)

[Scope of utility model registration request] 1. A drive motor for rotatively driving a desired tool through a gear reduction mechanism is provided inside a tool body, and a trigger switch for turning on and off the drive motor is provided on the tool body. In the electric tool, a forward / reverse rotation switching lever for switching the forward / reverse rotation of the drive motor is provided near the trigger switch of the tool body so as to be rotatable around a shaft support pin. An electric power tool characterized in that both side portions near the center of rotation of the forward / reverse rotation switching lever are exposed from both side portions of the tool body.