JP3916872B2 - Electric tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power tool for processing a workpiece, and more particularly to a power tool technique in which a main handle portion and an auxiliary handle portion are provided in a power tool body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an electric tool having a main handle portion and an auxiliary handle portion in an electric tool body, for example, a hammer drill is known. This hammer drill is provided with a drill blade (processing tool) at the tip of a power tool body, and this drill blade is driven by a drive motor built in the power tool body. In general, the main handle is provided with an operation switch for driving a drive motor. The main handle part is provided at the rear in the machine direction of the electric power tool body, and the auxiliary handle part is provided in front of the main handle part. An operator can stably perform a machining operation by holding the main handle with one hand and operating the auxiliary handle with the other hand.
[0003]
[Problems to be solved by the invention]
By the way, in the hammer drill having the above-described conventional configuration, there is a demand for installing an electric appliance used for a tool auxiliary function, such as a lighting device or a sensor, in the power tool body. For example, in order to illuminate the processing site of the workpiece, it is preferable to provide an illuminating device at the tip position (position close to the drill blade) of the power tool main body. However, in this case, it is necessary to wire the lead wire of the lighting device in the vicinity of the tip position of the electric power tool body, which causes a problem of insulation of the lead wire and a problem that the assemblability deteriorates. On the other hand, although it is conceivable to provide another power source for the lighting device in the power tool body, it is necessary to newly secure a space for installing the power source.
Therefore, the inventors focused attention on the structure of the auxiliary handle that is originally arranged at the front position of the power tool body. The auxiliary handle portion is generally constituted by a pipe-like member and has a hollow portion therein. And the internal space (hollow part) of this auxiliary | assistant handle part was not utilized effectively. The inventors diligently studied a technique for effectively using the internal space (hollow part) of the auxiliary handle part in the hammer drill. As a result, the inventors of the present invention embody the technology using the internal space (hollow part) of the auxiliary handle part by storing the power supply of the electric appliance used for the tool auxiliary function in the auxiliary handle part. Successful.
It is an object of the present invention to provide a rational electric tool technique capable of effectively using an auxiliary handle portion in an electric tool provided with a main handle portion and an auxiliary handle portion in an electric tool body.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the electric power tool of the present invention is configured as described in claims 1 to 3. The invention according to claims 1 to 3 is an electric tool provided with an electric tool used for a tool auxiliary function separately from a drive motor for driving a processing tool. This is a technique in which the auxiliary handle portion is effectively used by being provided in the handle portion.
[0005]
The electric power tool according to claim 1, wherein the electric tool main body is provided with a main handle portion and an auxiliary handle portion. The “main handle part” here is a handle mainly used by an operator during machining work, and is generally provided at the rear part in the machine direction of the electric power tool body, and is a switch for a drive motor that drives a machining tool, for example, a machining blade. Has a lever. Further, the “auxiliary handle portion” is a handle that is used in an auxiliary manner together with the main handle portion, and is provided, for example, in front of the main handle portion (on the processing tool side) of the power tool body. Then, the operator can perform the processing operation of the workpiece while holding the main handle portion with one hand and the auxiliary handle portion with the other hand.
The auxiliary handle portion is provided with a DC power source. Here, it is preferable that the auxiliary handle portion has an internal space, and a DC power source is provided in the internal space. As the DC power source, for example, a rechargeable battery or a dry battery is suitable. And this direct-current power supply will be used to operate an electric appliance different from the drive motor. This electric instrument is used in addition to the drive motor that drives the processing tool, and is used in an auxiliary manner in connection with the machining operation. For example, an instrument that controls the drive motor, a lighting device, a notification lamp, a notification buzzer, etc. Is preferred. Thereby, it is not necessary to newly secure a place to install a DC power source for operating the electric tool for the tool auxiliary function inside or outside the electric power tool body. Moreover, since it is not necessary to wire the lead wire of the electric tool for the tool auxiliary function near the tip position of the electric power tool body, it is possible to avoid the problem of insulation and the problem that the assemblability is deteriorated.
As described above, according to the electric tool described in claim 1, the existing space of the auxiliary handle portion, for example, the internal space (hollow portion) of the auxiliary handle portion can be effectively used. Of course, the present invention includes a form in which the housing of the DC power supply itself is used as the auxiliary handle portion.
The “electric tool” in the present invention includes a wide range of electric tools for processing a workpiece, and examples of the electric tool include a hammer drill, a driver drill, and an impact wrench. The “processing tool” includes bits used for screw tightening and bolt tightening in addition to a processing blade for cutting, polishing, drilling, and the like of a workpiece.
[0006]
Further, in the electric tool according to claim 2, the DC power source provided in the auxiliary handle portion is used for the operation of the electric appliance that controls the drive motor. This electric appliance detects the distance to the workpiece and controls the drive motor based on the detection result. For example, it is preferable that the drive motor is stopped or the rotational speed is decreased when the distance to the workpiece reaches a predetermined value that is considered to be the processing of the workpiece. If comprised in this way, since the direct-current power source provided in the auxiliary | assistant handle part can be used as a direct-current power source of the electric appliance which controls a drive motor, it is rational.
[0007]
Further, in the electric tool according to claim 3, the DC power source provided in the auxiliary handle portion is used for the operation of the lighting device. It is preferable that this illuminating device can irradiate a processing part (a processing surface of the workpiece, a tip of the processing blade, etc.) particularly when processing the workpiece. If comprised in this way, since the direct-current power source provided in the auxiliary | assistant handle part can be used as a direct-current power source of the illuminating device used when processing a workpiece, for example, it is rational.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Below, the structure of the electric tool of 1st and 2nd embodiment in this invention is demonstrated based on drawing.
[First embodiment]
In the first embodiment, the present invention is applied to a so-called hammer drill, and will be described with reference to FIG. Here, FIG. 1 is a side view showing an appearance of the hammer drill 1 of the first embodiment.
[0009]
As shown in FIG. 1, in the hammer drill 1 as an electric tool of the present invention, the electric tool main body 10 is provided with a main handle portion 11 that protrudes downward from a rear portion in the longitudinal direction (right side in FIG. 1). In addition, a drill blade 17 for processing the workpiece W is attached to the power tool main body 10 at the front in the machine length direction (left side in FIG. 1). This drill blade 17 corresponds to the processing tool in the present invention. The drill blade 17 is configured to be rotated by a drive motor 12 built in the electric power tool body 10. The drive motor 12 is an electric drive type, and is electrically connected to an external AC power source via a cable 14 extending from the main handle portion 11, a control device 13, and the like. The drill blade 17 can be replaced with, for example, a drill blade or a bit depending on the application.
[0010]
The main handle portion 11 includes a switch lever 15 on the front side, and when an operator operates the switch lever 15, electricity is supplied from the external AC power source to the drive motor 12, thereby rotating the drill blade 17. . The switch lever 15 is normally in an off state of the drive motor 12, and is configured such that the drive motor 12 is turned on only when the switch lever 15 is pulled with a finger. Yes.
[0011]
The power tool main body 10 is further provided with an auxiliary handle portion 20 that protrudes downward from the center in the machine length direction. The auxiliary handle portion 20 includes a frame portion 21, a grip portion 22, and the like, and is fixed to the electric tool main body 10 by a fixing member such as a bolt. Therefore, the auxiliary handle portion 20 can be attached to and detached from the power tool main body 10. The auxiliary handle portion 20 is used in an auxiliary manner together with the main handle portion 11 when the worker processes the workpiece W. The worker uses both the main handle portion 11 and the auxiliary handle portion 20. Grab it with your hand and process it. Thereby, processing work can be performed stably. In addition, the installation position, installation angle, etc. of the main handle part 11 and the auxiliary handle part 20 provided in the electric power tool body 10 can be variously changed as necessary.
[0012]
The auxiliary handle portion 20 has an internal space (hollow portion), and a battery 23 is accommodated at a position corresponding to the grip portion 22 of the internal space (hollow portion). The battery 23 is electrically connected to an optical sensor mechanism to be described later, and serves as a power source for operating the optical sensor mechanism. This battery 23 corresponds to the DC power source in the present invention. For example, a dry battery or a rechargeable battery is used as the battery 23. When the remaining amount of the battery decreases, the removal portion 22a at the tip of the grip portion 22 can be removed and the battery 23 can be replaced.
[0013]
Further, the hammer drill 1 is provided with an optical sensor mechanism (corresponding to the electric appliance in the present invention) for controlling the drive motor 12 using light as a tool auxiliary function. This optical sensor mechanism is configured to detect a distance from the hammer drill 1 to the workpiece W and to send a stop signal to the drive motor 12 when the distance reaches a predetermined value.
Specifically, the first light emitting part 24, the first light receiving part 25, the second light emitting part 26, the setting dial 28 provided in the frame part 21, the second light receiving part 27 provided in the main handle part 11, etc. Thus, an optical sensor mechanism is configured. The light emitted from the first light emitting unit 24 is received by the first light receiving unit 25 provided below the first light emitting unit 24, so that the distance from the front part of the frame unit 21 to the workpiece W is increased. It is configured to be detected. In addition, when the detected distance reaches a predetermined value, light is emitted from the second light emitting unit 26 toward the second light receiving unit 27. The predetermined value is a distance that is considered to be the processing of the workpiece W, for example, an initial distance from the front portion of the frame portion 21 to the workpiece W, a desired processing depth, and a type of processing blade ( Length) and the like.
[0014]
When the second light receiving unit 27 receives light from the second light emitting unit 26, a stop signal is transmitted to the drive motor 12 via the control device 13. Therefore, even if the switch lever 15 is in the ON state, the rotation of the drive motor 12 and the drill blade 17 is forcibly stopped. Thereby, it is possible to prevent the drill blade 17 from continuously rotating when the processing of the workpiece W is completed.
[0015]
The setting dial 28 sets, for example, the light receiving sensitivity of the first light receiving unit 25 when detecting the distance from the front portion of the frame portion 21 to the workpiece W. That is, for example, the light reflection characteristics differ between the case where the workpiece W is made of wood and the case where it is made of metal, and therefore it is necessary to correct the light receiving sensitivity of the first light receiving unit 25 according to the type of the workpiece W. . In the present embodiment, as shown in the figure, it can be set in three stages of 1 to 3, and by operating the setting dial 28 according to the material of the workpiece W, the light receiving of the first light receiving unit 25 is performed. The sensitivity can be set to a desired setting value.
[0016]
According to the hammer drill 1 of the first embodiment configured as described above, the internal space of the auxiliary handle portion 20 can be effectively used as a storage location for the battery 23. In addition, the battery 23 accommodated in the auxiliary handle portion 20 can be used as a power source for operating the optical sensor mechanism that controls the drive motor 12, which is reasonable. That is, it is not necessary to newly secure a place for installing the battery 23 for operating the optical sensor mechanism inside or outside the power tool body 10. Further, since it is not necessary to wire the lead wire of the optical sensor mechanism near the tip position of the electric power tool body 10, the problem of lead wire insulation and the problem of poor assembly can be avoided.
Further, it is effective to prevent the drill blade 17 from continuously rotating when the processing of the workpiece W is completed.
Moreover, since the auxiliary | assistant handle part 20 was comprised so that attachment or detachment was possible with respect to the electric tool main body 10, it can be set as an optional component and versatility is high.
Note that the sensor mechanism that detects the distance between the hammer drill 1 and the workpiece W and is used to control the drive motor 12 is not limited to an optical type, and is, for example, an ultrasonic type, a capacitance type, an eddy current, or the like. Various sensor mechanisms, such as a type and a differential transformer type, can be used.
[0017]
[Second Embodiment]
Next, in the second embodiment, the present invention is applied to a hammer drill as in the first embodiment, and will be described with reference to FIG. Here, FIG. 2 is a side view showing an appearance of the hammer drill 2 of the second embodiment. In FIG. 2, the same elements as those shown in FIG. Further, since the main configuration of the hammer drill is the same as that of the first embodiment, in the second embodiment, only the configuration will be described mainly in a portion different from the first embodiment.
[0018]
As shown in FIG. 2, in the hammer drill 2 as the electric power tool of the present invention, the auxiliary handle portion 20 has a frame portion 21, a grip portion 22 and the like, and a fixing member such as a bolt, as in the first embodiment. Thus, the power tool body 10 is fixed to the center in the machine direction. Moreover, the inside of the auxiliary | assistant handle part 20 is hollow shape, and the battery 23 similar to 1st Embodiment is accommodated in the internal space (hollow part) corresponding to the grip part 22. FIG.
A lighting device 30 (corresponding to the electric appliance in the present invention) is attached to the tip of the grip portion 22 for a tool auxiliary function. The illumination device 30 includes a light 31 that emits irradiation light, and the light 31 is electrically connected to the battery 23 via an extension member 32. That is, the battery 23 is a power source for operating the lighting device 30. The extension member 32 has a flexible structure that allows the direction of irradiation with the light 31 to be freely changed. Then, the light 31 can be turned on or off by rotating the changeover switch 29 to the on (ON) side or the off (OFF) side. The illumination device 30 is particularly effective for irradiating a processing site (a processing surface of the workpiece W, a tip portion of the drill blade 17, etc.). In addition, it is convenient because it can be used as a simple flashlight if it is not processed.
[0019]
According to the hammer drill 2 of the second embodiment configured as described above, the internal space of the auxiliary handle portion 20 can be effectively used as a storage location for the battery 23 as in the hammer drill 1 of the first embodiment. In addition, the battery 23 accommodated in the auxiliary handle portion 20 can be used as a power source for the lighting device 30 used in the processing operation. That is, it is not necessary to newly secure a place for installing the battery 23 for operating the lighting device 30 inside or outside the power tool body 10. Moreover, since it is not necessary to wire the lead wire of the illuminating device 30 in the vicinity of the tip position of the electric power tool main body 10, the problem of insulation of the lead wire and the problem that the assemblability deteriorates can be avoided.
[0020]
[Other Embodiments]
In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered. For example, each of the following embodiments to which the above embodiment is applied can be implemented.
[0021]
(A) In the said embodiment, although the hammer drill 1 and 2 as an electric tool described about the case where the battery 23 which operates an electric instrument in the auxiliary | assistant handle part 20 was described, the kind of electric tool is not limited to this. For example, the present invention can be applied to other power tools such as a driver drill and an impact wrench. Therefore, the processing tool is not limited to the drill blade 17 of the above embodiment, and may be a bit used for screw tightening or bolt tightening.
[0022]
(B) Moreover, in the said embodiment, although the battery 23 accommodated in the auxiliary | assistant handle part 20 was described about the case where it uses for the action | operation of an optical sensor mechanism or an illuminating device, the use of this battery 23 is to these It is not limited and can be variously changed as necessary. For example, an electric fan directed to the workpiece side may be provided, and the electric fan may be operated by the battery 23 to blow away chips or the like of the workpiece generated during machining.
[0023]
(C) Although the case where the battery 23 is accommodated in the internal space of the auxiliary handle portion 20 has been described in the above embodiment, for example, the battery 23 may be attached to the distal end portion of the auxiliary handle portion 20. Further, the auxiliary handle portion 20 itself can be constituted by the battery 23.
[0024]
(D) In the first embodiment, the case where the drive motor 12 is stopped when the distance from the front portion of the frame portion 21 to the workpiece W reaches a predetermined value is described. However, the rotational speed of the drive motor 12 is reduced. Or a notification lamp or a notification buzzer can be activated.
[0025]
【The invention's effect】
As described above, according to the present invention, in a power tool including a main handle portion and an auxiliary handle portion in a power tool body, a rational power tool technology capable of effectively using the auxiliary handle portion is realized. Can do.
[Brief description of the drawings]
FIG. 1 is a side view showing an appearance of a hammer drill 1 according to a first embodiment of the present invention.
FIG. 2 is a side view showing an appearance of a hammer drill 2 according to a second embodiment of the present invention.
[Explanation of symbols]
1, 2, ... hammer drill (electric tool)
DESCRIPTION OF SYMBOLS 10 ... Electric tool main body 11 ... Main handle part 12 ... Drive motor 13 ... Control apparatus 17 ... Drill blade (processing tool)
20 ... Auxiliary handle part 24 ... 1st light emission part 25 ... 1st light-receiving part 26 ... 2nd light-emitting part 27 ... 2nd light-receiving part 28 ... Setting dial 23 ... Battery (DC power supply)
30 ... Lighting device 31 ... Light W ... Workpiece

Claims (3)

A main handle provided in the power tool body, an auxiliary handle part detachably attached to the power tool body, a processing tool for processing a workpiece, a drive motor for driving the processing tool, In addition to the drive motor, an electric tool provided with an electric appliance used for a tool auxiliary function,
An electric tool in which an internal space of the auxiliary handle portion is a storage space for a battery serving as a DC power source for operating the electric appliance .  The electric tool according to claim 1, wherein the electric appliance is configured to detect a distance to a workpiece and to control the drive motor based on the detection result. Electric tool.  The electric tool according to claim 1, wherein the electric appliance is a lighting device.

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