JP3572665B2 - Portable power tools - Google Patents

Description

[0001]
[Industrial applications]
The present invention provides a lever that moves when an operator applies a thrust and returns to an initial position when the operator releases the thrust.The switch can be held in an on state while the operator applies a thrust, and the switch is locked when the thrust is released. The present invention relates to a portable power tool provided with a switch-on lock mechanism for releasing and being held and operated by an operator himself .
[0002]
[Prior art]
A conventional portable power tool provided with a conventional switch-on lock mechanism will be described with reference to FIG.
Conventionally, an on-lock button 5 which is integral with a switch is provided in the handle 2, the trigger 3 is pulled, the switch is turned on, and when the on-lock button 5 is pressed, the switch is locked and held in the on state, and the trigger is triggered again. When 3 was pulled, the lock was released and the switch was turned off.
In order to prevent the switch from being inadvertently turned on when the handle 2 is gripped, the position of the switch must be different from the direction in which the thrust indicated by the arrow in FIG. 5 is applied. From above, it was necessary to be able to independently switch on and off regardless of the handle shape and thrust load position.
[0003]
[Problems to be solved by the invention]
In a portable power tool that is held by the operator himself and works while applying thrust, it is better to hold the switch on and off while operating independently, and to work without holding the switch. Efficient. However, in the conventional on-lock mechanism, once the switch is held in the ON state, the ON-lock cannot be released and the power cannot be stopped unless the switch is re-grip and switched to the OFF state. Therefore, if a large reaction force is suddenly applied to the power tool when working while holding the switch while holding the ON state, the switch cannot be turned off immediately and the power tool will be damaged. there were.
In addition, when trying to turn off the switch in the above-described situation, there is a case where a reaction force is transmitted to the operator and the arm is twisted, and when the scaffold is poor, a dangerous situation such as being shaken off may occur.
Some power tools do not have an on-lock mechanism in order to avoid the above drawbacks. However, in this case, it is necessary to hold the switch all the time to work, so that there is a drawback that the degree of fatigue of the worker is increased and the efficiency is reduced.
[0004]
An object of the present invention is to solve the above-mentioned drawbacks and to provide a switch-on lock mechanism that can hold the on-lock state during work, and can immediately turn off the switch when the work is interrupted due to a reaction force or the like. is there.
[0005]
[Means for Solving the Problems]
The above object is to provide a lever which moves when a worker applies a thrust and returns to an initial position when released, and when the lever moves, that is, the switch can be set to an on-lock state during work, the work is interrupted and the lever is stopped. This is achieved by a configuration in which when the switch returns to the initial position, the switch is unlocked and the switch is turned off. In addition, operability of the switch main body is ensured by adopting a configuration in which the switch can be operated independently of the operation of the lever.
[0006]
[Action]
The switch on-lock mechanism configured as described above can lock the switch when the operator is applying thrust and hold it in the ON state, and release the thrust to unlock and switch the switch to the OFF state. it can.
[0007]
【Example】
A first embodiment of the present invention will be described with reference to FIGS.
A switch 1 for switching the power of the power tool on and off is provided in a handle 2 constituting an outer frame of the power tool. When the trigger 3 is pulled in the direction A, the switch 1 is turned on. When the trigger 3 is released, the switch 1 automatically returns to the initial position in FIG. 1 and is turned off.
[0008]
The switch-on lock mechanism includes a lever 4, a lock button 5, a first spring 6, and a second spring 7, and the lever 4 is provided on the handle 2 at a position opposite to the trigger 3 of the switch 1. The lever 4 is provided so as to move forward when a thrust is applied, and to return to the initial position by the first spring 6 when the thrust is released. The lever 4 is provided with a long hole 8 and a contact 9.
The lock button 5 is supported so as to be rotatable around a rotation fulcrum 10 fixed to the handle 2. Since the rear end of the lock button 5 is constantly pressed upward by the second spring 7, a force is applied downward at the front end. When the operator does not apply a thrust to the power tool, the lever 4 is in the initial position, the contact portion 9 of the lever 4 is in contact with the lock button 5 behind the rotation fulcrum 10, and the lock button 5 is the second spring. The rotation has been stopped by 7. When the operator grips the handle 2 to start the operation, the lever 4 is also gripped, so that a thrust is applied to the lever 4 and the lever 4 moves forward. When the lever 4 moves forward, the contact portion 9 of the lever 4 moves forward of the pivot 10 of the lock button 5. Since the rear end of the lock button 5 is constantly applied with an upward force by the second spring 7, the front end is applied with a downward force. Here, when the worker pulls the trigger 3 of the switch 1 in the direction A, the front end of the lock button 5 goes around the trigger 3 with the rear end of the lock button 5 inserted into the elongated hole 8 of the lever 4 as shown in FIG. , The trigger 3 is locked and kept in the ON state. When the hand is released from the lever 4 during the operation and the thrust is released, the lever 4 is retracted by the first spring 6 and returns to the initial position. At this time, since the lever 4 moves backward and pushes down the rear end of the lock button 5 behind the rotation fulcrum 10, the front end of the lock button 5 is pushed up and disengaged from the trigger 3, and the trigger 3 is turned off as shown in FIG. Returning to the initial position, the switch 1 switches to the off state.
Further, the operator can arbitrarily switch the switch 1 to the off state by pushing up the front end of the lock button 5 and returning the trigger 3 without releasing the lever 4.
[0009]
A second embodiment of the switch-on lock mechanism of the present invention will be described with reference to FIGS. A switch 1 is provided in the handle 2, and the operation of the switch 1 is the same as that of the first embodiment. The switch-on lock mechanism includes a lever 4, a lock button 5, a first spring 6, and a second spring 7. The lever 4 is provided in a direction opposite to the trigger 3 of the switch 1, and is provided to be rotatable about a rotation fulcrum 10 fixed in the handle 2. The lever 4 is provided with a first spring 6. When a load is not applied to the lever 4, the lever 4 rotates in the direction opposite to the trigger 3. As a result, the rotation has stopped. Further, a first notch 12 is provided at the tip of the lever 4. When the operator grips the handle 2 to start the operation, the lever 4 is also gripped, so that a thrust is applied to the lever 4 and the lever 4 rotates about the rotation fulcrum 10 in the direction of the trigger 3. As shown in FIG. 4, the rotation of the lever 4 is stopped by the second protrusion 13 provided on the handle 2. Here, when the trigger 3 of the switch 1 is pulled to turn the switch 1 on, and the lock button 5 is further pushed in the direction A, the second notch 14 at the tip of the lock button 5 and the tip of the lever 4 as shown in FIG. The first notch 12 of the section is fitted, the switch 1 is locked and held in the ON state.
When the thrust is released by releasing the lever 4 during the operation, the lever 4 is rotated by the first spring 6 around the rotation fulcrum 10 in the direction opposite to the trigger 3. Therefore, the tip of the lever 4 also rotates, so that the first notch 12 and the second notch 14 are disengaged from each other, and the on-lock state is released.
Further, even if the lever 4 is not released, the lock button 5 moves together with the trigger 3 of the switch 1. Therefore, when the operator further pulls the trigger 3 in the A direction, the second notch portion 14 of the lock button 5 also moves in the A direction. The lever 4 moves, the fitting of the lever 4 to the first notch 12 is released, the lock button 5 returns to the initial position by the force of the second spring 7, and the on-lock state of the trigger 3 is released.
[0010]
【The invention's effect】
According to the present invention, the switch can be locked and held in the ON state during work, and when the thrust is released, the ON lock state can be immediately released and the switch can be switched to the OFF state. It is not necessary to continue, and thrust can be applied efficiently, and work can be performed safely against unexpected reaction force.
[Brief description of the drawings]
FIG. 1 is a sectional side view showing a first embodiment of a switch-on lock mechanism of the present invention.
FIG. 2 is a sectional side view showing the locked state of FIG. 1;
FIG. 3 is a sectional side view showing a second embodiment of the switch-on lock mechanism of the present invention.
FIG. 4 is a sectional side view showing the locked state of FIG. 3;
FIG. 5 is a side view showing an example of a power tool with an on-lock mechanism according to the related art.
[Explanation of symbols]
1 is a switch, 2 is a handle, 3 is a trigger, 4 is a lever, 5 is a lock button, 6 is a first spring, 7 is a second spring, 8 is a long hole, 9 is a contact point, 10 is a pivot point, 11 is a first protrusion, 12 is a first notch, 13 is a second protrusion, and 14 is a second notch.

Claims (1)

A switch having a motor, an externally operable trigger for switching power on and off, and a handle provided with the switch , wherein the switch is turned on when the trigger is pulled, and the trigger is automatically turned on. A portable power tool that can be returned to its initial position
The handle is urged in a direction to protrude outward from the handle by a spring, and is switched between an initial position protruding outward from the handle and a movement position moved by a thrust against the urging force of the spring. Possible , a lever provided at a position opposite to the trigger, and when the thrust is applied to move the lever to the moving position, the trigger is locked to the ON position in conjunction with the lever, and A portable power tool having a lock button for releasing the lock of the trigger when the thrust is released .

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