JPH09300338A - Method and apparatus for displaying push force of core drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance work efficiency by displaying the push force of a core bit to an object to be drilled at the time of drilling work by allowing a light emitting diode of the color corresponding to the region where a generated motor current is positioned to light. SOLUTION: When the push-in force of a core bit 18, that is, the push force is strong and excessive load acts on a motor, the LED (red) 12-3 of a third region lights and the push force is weakened until the LED (yellow) 12-2 lights by the confirmation of the lighting of the LED 12-3, the proper push force fitted to the altitude of an object 26 to be drilled can be appropriately adjusted and set. If the push force for pushing in the core bit 18 is weak, the load applied to the motor becomes small and, since the number of rotations of the motor rises, push force is too weak and the current of the motor becomes below about 14A smaller than a rated region and the LED (green) 12-1 of a first region lights.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing force display method and a pressing force display device of a core drill for allowing an operator to recognize the pressing force of a core bit with respect to an object to be drilled.

[0002]

2. Description of the Related Art In order to perforate a circular hole having a predetermined diameter in an object to be perforated such as concrete walls, beams, floors and fume pipes,
Core drills are widely used.

Such a core drill has a drill body that rotatably supports a core bit under mounting on an output shaft of a motor, a support that slidably supports the drill body, and a base to which the support is fixed. I have it. And
Under the slide of the drill body along the pillar, the core bit at the tip is pushed against the object to be drilled while rotating, and the progress of the core bit under this pushing causes the object to be drilled. The core drill of is composed.

[0004]

By the way, in this type of core drill, the two points of not reducing the rotational speed of the core bit and advancing the core bit faster with respect to the object to be drilled are the conditions for obtaining quick drilling. It is said that.
However, when the core bit is strongly pressed against the object to be drilled in order to advance the core bit quickly, the load on the motor increases due to the increase in resistance to rotation of the core bit, so that the rotation speed of the motor decreases, that is, the A decrease in rotation speed cannot be avoided.

On the other hand, if the pushing force of the core bit against the object to be punched is weakened, the load applied to the motor is reduced, so that the rotation speed of the core bit can be kept high. However, in such a state, since the pressing force of the core bit on the drilling target is small, the progress of the core bit on the drilling target is slow and the drilling time becomes long.

That is, in this type of core drill,
Although it is required to advance the core bit under an appropriate pressing force according to the hardness of the object to be drilled in order to shorten the drilling time, such adjustment of the pressing force is generally required by the operator. Since the operator relies heavily on the sense (work feeling), the drilling time tends to vary depending on the operator.

Particularly, for beginners and the like who do not have the skill and working feeling, since the pressing force cannot be easily adjusted, not only the working efficiency is lowered but also unnecessary trouble may be caused.

Therefore, for example, a configuration with a so-called ammeter (ampere meter) is known in which the motor current is increased or decreased by the load applied to the motor, and the motor current is taken out and displayed by an ammeter. With such a core drill with an ammeter, the size of the load applied to the motor can be recognized by checking the current value of the motor with the ammeter.Therefore, even for beginners with no skill or working feeling, the core bit can be pushed. The amount of force can be adjusted easily.

However, since the motor current fluctuates even when the pressing force is slightly changed, the needle of the ammeter is constantly swinging, and it is easy to recognize the position of the needle, that is, the motor current value. Not only that, but the visibility is unavoidable.

The ammeter used for such a purpose is usually upsized in order to ensure its visibility. However, such an increase in the size of the ammeter leads to an increase in the size of the mounting part of the ammeter, and hence the drill body.
Not preferred.

Further, in such an ammeter, swinging beyond the movable range of the needle, so-called swinging of the needle, is likely to cause a failure. However, for beginners and the like who cannot easily adjust the pressing force, it is easy to delay handling of the needle being shaken out, and the ammeter is likely to malfunction due to this.

According to the present invention, it is possible to improve the work efficiency and make the work time uniform, reduce the arrangement space, and
It is an object of the present invention to provide a pressing force display method and a pressing force display device for a core drill that improve visibility.

[0013]

In order to achieve this object, according to the pressing force display method of the core drill of the present invention, the whole region of the motor current is divided into at least three regions,
By pressing the LED of the color corresponding to the area where the generated motor current is located, it is possible to display the pressing force of the drill body against the drilling object during drilling work.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a core drill pressing force display device 10 according to the present invention includes a motor (not shown).
The core drill 14 is provided with three types of LEDs (light emitting diodes) 12-1 to 12-3 of different colors that can be turned on according to the current (motor current) generated in the.

As can be seen from FIG. 2, the core drill 14
Is a drill body 20 that rotatably supports the core bit 18 under mounting on the output shaft 16 of the motor, a pillar 22 that slidably supports the drill body, and a base to which the pillar is fixed.
24 and have. And the drill body along the struts 22
Under the slide of 20, push the core bit 18 at the tip while rotating it against the drilling object 26 such as concrete wall, beam, floor or fume pipe, and under this pushing, the core bit for the drilling object This type of core drill 14 is configured so that the object to be drilled is drilled by the progress of.

The structure of such a core drill 14 is known, and the structure itself is not the purpose of the present invention.
It is not described in detail here.

Here, in the present invention, as shown in FIG. 3, the entire region of the motor current generated by driving the motor is divided into, for example, three regions, a first region to a third region. . Then, as shown in FIG. 1 and FIG.
3 of different colors corresponding to the divided first to third areas
Seed LEDs 12-1 to 12-3 are provided for each area so that they can be turned on when the current value of the motor is located.

The three regions of the motor current are divided into, for example, a rated region in a specific range including the rated current value of the motor and regions before and after the rated region. In this embodiment, assuming that the rated current of the motor is 15 A, in FIG.
As can be seen from the above, the rated area is defined as a second area that has a certain width before and after this rated current value, for example, 14A or more and less than 16A, and is less than 14A before this rated area. Area is the first area, 16A after the rated area
The above areas are defined as the third areas.

The LED 12-1 for displaying the first area is green (blue), the LED 12-2 for displaying the second area is yellow, and the LED 12-3 for displaying the third area is red. Of 3
It can be illustrated as the color of each LED corresponding to one area (see Fig. 3).

The LEDs 12-1 to 12-3 have a circuit as shown in FIG.
It is connected via 28 so that the motor current can be taken out. This circuit 28 is formed mainly of, for example, an IC, and is configured to monitor the motor current generated by driving the motor and turn on the LEDs 12-1 to 12-3 according to the area where the current value of the motor is located. Has been done. Further, in this embodiment, among the three types of LEDs 12-1 to 12-3, the circuit 2 is configured so that only the LED in the region where the motor current is located is lit.
8, and eventually the pressing force display device 10 is configured.

The circuit 28 is only required to be capable of lighting the LEDs 12-1 to 12-3 according to the area where the motor current value is located, and since this circuit itself is not the purpose of the present invention,
Detailed description of this circuit is omitted here.

The LEDs 12-1 to 12-3 of the pressing force display device
Is a location easily recognized by the operator, for example, in FIGS.
It is arranged in juxtaposition with the rear end 20a of the drill body 20 as shown in FIG.

In such a pushing force display device 10, when the rated load is applied to the motor, that is, when the motor is driven at the rated speed, the motor current of approximately the rated value is obtained. Therefore, if the pressing force on the core bit 18 is suitable for the hardness of the drilling target 26, only the LED (yellow) 12-2 in the second area, which is the rated area, is turned on.

The motor used in such a core drill 14 has the characteristic that the rotation speed decreases and the motor current increases due to an increase in the load on the motor, as shown in FIG. , If the pushing force that pushes the core bit 18 is strong and the motor current rises above 16A, which exceeds the rated range, the LED in the 3rd range
(Red) 12-3 lights up.

In this way, the force to push in the core bit 18,
In other words, if the pushing force is strong and an excessive load is applied to the motor, the LED (red) 12-3 in the third area lights up.
By recognizing the lighting of D, the pressing force is applied to the LED in the second area (yellow).
If it is weakened until 12-2 lights up, an appropriate pressing force suitable for the hardness of the punched object 26 can be adjusted and set as appropriate.

On the other hand, if the pushing force for pushing the core bit 18 is weak, the load applied to the motor will be small and the rotation speed of the motor will increase. Therefore, the pushing force is too weak and the motor current is smaller than the rated range. If less than 14A, the first
Area LED (green) 12-1 lights up. And the core bit
If the pushing force of 18 is made strong until the LED (yellow) 12-2 in the second region is turned on, an appropriate pushing force suitable for the hardness of the object to be punched 26 can be adjusted and set in this case as well.

As described above, according to the pressing force display method of the core drill of the present invention, the strength of the pressing force of the operator is displayed by lighting the three kinds of LEDs 12-1 to 12-3 of different colors. Therefore, the operator can easily recognize his / her own pressing force on the core bit 18. Then, it is sufficient to appropriately adjust the strength of the pressing force of the core bit 18 until the LED (yellow) in the rated area lights up, so that the pressing force can be adjusted smoothly and easily.

In other words, since the strength of the pressing force of the core bit 18 is clearly displayed, even a beginner can easily adjust the appropriate pressing force, and perform a quick drilling work under the appropriate pressing force. Is easily possible. Therefore, regardless of the skill of the operator and whether or not there is a feeling of work, the work efficiency can be improved, and the variation in the work time of the core drill 14 can be suppressed, that is, the work time can be made uniform. Becomes

Particularly, in the case of reinforced concrete in which reinforcing bars are embedded in the concrete body, the hardness of the drilling object 26 changes remarkably depending on the presence or absence of the reinforcing bars. Therefore, by displaying such a pressing force, the change can be easily made. A compatible core drill 14 is obtained.

Further, the strength of the pressing force with respect to the core bit 18 is displayed for each predetermined area by lighting the LEDs 12-1 to 12-3 of different colors, so that the area can be easily and clearly recognized.

Further, since the display is within a specific range, there is no change in the LEDs 12-1 to 12-3 that are turned on under the fluctuation of the current value of the motor in the same area. That is, since the display does not change under the slight movement of the current value of the motor, the display of the pressing force is clarified also from this point by simplifying the display.

According to the pressing force display device 10 of the core drill of the present invention, the above-mentioned pressing force display method can be appropriately performed, and the pressing force can be clearly displayed during the drilling operation.

Further, since the strength of the pressing force is displayed by the three kinds of LEDs 12-1 to 12-3 of different colors, the failure due to the swing-out like the ammeter accompanied by the swing of the needle does not occur. That is, it is possible to easily secure the pressing force display device 10 having a long life.

Further, according to the present invention, a pushing force display device is provided.
As 10, it is sufficient to dispose three kinds of LEDs 12-1 to 12-3 of different colors in a juxtaposed manner, so that the space for disposing the pressing force display device can be sufficiently miniaturized. Therefore, the drill main body 20 in which the pressing force display device 10 is arranged, and further, the core drill 14, can be sufficiently miniaturized.

Here, in the embodiment of the present invention, the rated value of 15A is set to approximately 14A or more and 16A or more with the rated value of 15A.
The range below is defined as the second area, which is the rated area, and the areas before and after it are classified as the first and third areas. However, the present invention is not limited to this, and the motor current may be divided into, for example, three regions in which the first region is less than 15 A, the second region is 15 A or more and less than 20 A, and the third region is 20 A or more.

In such a division in which the area less than 15A is the first area, the area above 15A is less than 20A is the second area, and the area above 20A is the third area, the rated area as described above is the first area and the second area. LED 1 (green) in the first area 12-1 to cover both sides
The pressing force to the extent that the LED (yellow) 12-2 in the second area and the second region (yellow) 12-2 are alternately turned on (blinking) is a pressing force suitable for the hardness of the drilling target 26 and the like.

However, as in the embodiment of the present invention, the rated value of 15A is set at approximately the center of 14A or more 16A
If the rated area less than A is defined as one area (second area), the appropriate pressing force will be displayed by the corresponding LED (yellow) 12-2 being lit continuously, thus further clarifying the rated area. It comes off.

In this embodiment, the motor current is divided into three regions, but the present invention is not limited to this. For example, the motor current may be divided into four or more regions. However, since it is easy to adjust the pressing force to the core bit 18 if it is known that the motor current exists in the rated region and the regions before and after the rated region, the complication of the configuration can be prevented by dividing the region into three.

Further, in this embodiment, the LED 12
-1 to 12-3 is embodied as a configuration in which only the LED in the area where the motor current is located is lit, but the invention is not limited to this. The LED may be turned on.

Further, assuming that the LED 12-1 in the first area is green (blue), the LED 12-2 in the second area is yellow, and the LED 12-3 in the third area is red, three kinds of LED colors are exemplified. However, since it is sufficient to use LEDs of different colors in the three areas, it is not limited to these colors, and LEDs of other colors are provided in the first, second, and third areas, respectively. Good.

In the embodiment of the present invention,
Although the rated current of the motor is exemplified as 15 A, it is needless to say that the present invention is not limited to this and a core drill having a motor with another rated current, for example, a rated current of 20 A, can be similarly configured. For a motor with a rated current of 20A, for example, the region of 19A or more and less than 21A is defined as the rated region, and this rated region, the region of less than 19A before the rated region, and the region of 21A or more after the rated region. And 3
The motor current area may be divided into two areas.

The embodiments of the present invention described above are intended to explain the present invention, and do not limit the present invention in any way. Modifications, modifications, etc., within the technical scope of the present invention may be made. It goes without saying that all are included in the present invention.

[0044]

As described above, according to the pressing force display method of the core drill according to the present invention, the strength of the pressing force of the operator with respect to the core bit is clearly displayed by lighting three kinds of LEDs of different colors. Therefore, even a beginner can easily adjust an appropriate pressing force, and can easily perform a quick punching operation under an appropriate pressing force. Therefore, regardless of the skill of the worker and whether or not there is a feeling of work, the work efficiency of drilling with the core drill and the uniform working time can be ensured.

Further, the strength of the pressing force on the core bit is
Since each area is displayed by the corresponding LED color, the area corresponding to the pressing force can be easily and clearly recognized.

According to the pressing force display device of the core drill of the present invention, the above pressing force display method can be appropriately performed,
It is possible to clearly display the pressing force during drilling work.

Further, since the strength of the pressing force is displayed by the three kinds of LEDs of different colors, the failure due to the swing-out like the ammeter accompanied by the needle swing does not occur. That is, it is possible to easily secure the pressing force display device having a long life.

Further, according to the present invention, it is sufficient to dispose three kinds of LEDs of different colors in a juxtaposed manner as the pushing force display device, so that the placement space of the pushing force display device can be sufficiently miniaturized. . Therefore, it is possible to sufficiently reduce the size of the drill body in which the pressing force display device is arranged, and hence the core drill.

If the motor current area is divided into three areas, the rated area including the rated current value and the areas before and after the rated area, the LED in the rated area corresponding to the appropriate pushing force is obtained.
Is displayed by continuous lighting, further clarifying the rated area.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a pressing force display device for a core drill according to the present invention, viewed from the direction of arrow A in FIG.

FIG. 2 is a schematic side view of a core drill provided with a pressing force display device.

FIG. 3 is a characteristic curve of a motor.

FIG. 4 is a circuit diagram of a pressing force display device for a core drill.

[Explanation of symbols]

 10 Core drill push force display device 12-1 to 12-3 LED (light emitting diode) 14 Core drill 18 Core bit 20 Drill body 22 Support 24 Base 26 Drilling target

Claims (5)

[Claims] 1. The whole area of the motor current is divided into at least three areas, and the LED of a color corresponding to the area where the generated motor current is located is lit to light the core bit of the object to be drilled during drilling work. How to display the pressing force of the core drill that can display the pressing force. 2. The position of the generated motor current is divided into at least three regions: the entire region of the motor current, which is a specific range including the rated value of the motor current; each region before and after the rated region; By turning on the LED of the color corresponding to the area to be drilled, the pressing force of the core bit against the object to be drilled during drilling work can be displayed, and the LE of the rated area can be displayed.
The pressing force display method for the core drill that makes it clear when D is lit as the optimum pressing force. 3. A core drill comprising: a drill body that rotatably supports a core bit under mounting on an output shaft of a motor; a pillar that slidably supports the drill body; and a base to which the pillar is fixed. In, the entire area of the motor current is divided into at least three areas, and different color LEDs are provided for each area so that the motor current can be turned on when the motor current is located in each of the divided areas. Pressing force display device for core drill. 4. A core drill comprising: a drill body for rotatably supporting a core bit under mounting on a motor output shaft; a pillar for slidably supporting the drill body; and a base to which the pillar is fixed. In, the whole area of the motor current is divided into at least three areas; the rated area of a specific range including the rated value of the motor current; each area before and after the rated area; and the motor current is divided into each area. LEDs of different colors that can be turned on when positioned
A pressing force display device for a core drill, wherein: 5. The core drill pressing force display according to claim 3, wherein three kinds of LEDs of different colors corresponding to respective regions of the motor current are arranged side by side at the rear end of the drill body. apparatus.