JP2014236647A - Power tool system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool system capable of preventing unintended generation of heat due to metallic foreign matters between coils.SOLUTION: The power tool system includes: a lid capable of closing an opening of a holster 10; and an open/close sensor 13 for detecting open/close of the lid. The holster 10 has a fan 15 for removing foreign matters from a gap between a power receiving coil 31b and a power transmission coil 14.

Description

  The present invention relates to a power tool system including a power tool and a storage tool that stores the power tool, and that performs non-contact power feeding between the power tool and the storage tool.

Conventionally, electric tools used when performing operations such as screw tightening are widely known (see, for example, Patent Document 1).
Such a power tool includes, for example, a power receiving coil (secondary coil), and in order to accommodate the power tool, for example, a power tool system that includes a power transmission coil (primary coil) in a housing such as a holster and performs non-contact power feeding has been developed (For example, see Patent Document 2).

  As described above, a device that performs non-contact power feeding using a power receiving coil and a power transmitting coil is not limited to a power tool, and is widely known in electrical equipment (see, for example, Patent Document 3). In the non-contact electric power feeder of patent document 3, while providing the power transmission coil in the box (accommodating tool) which has a cover part, the electric equipment is equipped with the power supply coil. And electric power is supplied with respect to an electric equipment in the state which accommodated the electric equipment in the box and closed the cover part.

Japanese Patent No. 5083630 Special table 2012-518975 gazette JP-A-4-317527

  By the way, in the electric tool system as described above, when the electric tool is not used, it may be accommodated in an accommodation tool such as a holster. At this time, in the power tool system as described above, foreign matter (metal foreign matter) may be mixed from the opening of a container such as a holster. As a result, there is a possibility that the metal foreign object is interposed between the power transmission coil and the power reception coil and unexpected heating occurs.

  Further, as in the case of the non-contact power feeding device as described above, since the metallic foreign matter can be reduced by providing the lid (housing tool) with the lid (housing tool), the hoisting tool such as a holster can also be used in the electric tool system. A certain effect can be expected by providing a lid on the lid. However, if a metal foreign object is mixed in the container when the lid is open, the metal foreign object may be interposed between the power transmission coil and the power reception coil, and unexpected heating may occur.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric tool system capable of suppressing the occurrence of unexpected heating due to metal foreign matter between coils.

  In order to solve the above-described problem, a power tool system includes a power tool having a power receiving coil and a power tool that houses the power tool and has a power transmission coil, and a lid that can close the opening of the power tool. An open / close detection unit that detects an open / closed state of the lid, and removes foreign matter between the power receiving coil and the power transmission coil by at least one of vibration and air flow in at least one of the power tool and the container. And a foreign matter removing means.

Moreover, the said structure WHEREIN: It is preferable that the said opening / closing detection part detects the opening / closing state of the said cover part by detecting the light quantity of the space in the said container.
In the above configuration, it is preferable that the open / close detection unit detects the open / closed state of the lid by detecting whether or not the lid is physically close to the opening of the container.

  Moreover, the said structure WHEREIN: The receiving coil with which the said electric tool is equipped is accommodated in the coil accommodating part with which an electric tool is equipped, It is preferable that the surface of the said coil accommodating part is a spherical surface or a slope.

  Further, in the above configuration, the power transmission coil is disposed in the lid, and the power reception coil accommodates the power transmission in a state where the power tool is accommodated in the housing, the lid is closed, and the opening is closed. It is preferable to be disposed in a manner facing the coil.

  Further, in the above-described configuration, a plurality of power transmission coils are arranged at equal angular intervals on the inner peripheral surface of the container, and one power reception is provided on the power tool side from at least one power transmission coil of the plurality of power transmission coils. It is preferable that power is supplied to the coil.

  Further, in the above configuration, the power transmission coil is provided so as to be wound along the inner peripheral surface of the container, and the power receiving coil is provided along the outer surface of the electric tool facing the inner peripheral surface. It is preferred that

  According to the power tool system of the present invention, it is possible to suppress the occurrence of unexpected heating due to metal foreign matter between the coils.

It is a schematic block diagram of the electric tool system in embodiment. It is a schematic block diagram for demonstrating the open / close sensor of the electric tool system in the same as the above. It is a block diagram for demonstrating schematic structure of the electric tool system same as the above. It is a schematic block diagram of the electric tool system in another example. (A) is a schematic block diagram of the electric tool system in another example, (b) is sectional drawing of (a). It is a block diagram for demonstrating schematic structure of the electric tool system same as the above. It is an electric circuit diagram for demonstrating the selection circuit of the electric tool system in the same as the above. (A) is a schematic block diagram of the electric tool system in another example, (b) is sectional drawing of (a). It is a schematic block diagram of the electric tool system in another example. It is a schematic block diagram of the electric tool system in another example. It is a schematic block diagram of the electric tool system in another example. It is a block diagram for demonstrating schematic structure of the electric tool system in another example. It is a schematic block diagram of the electric tool in another example. It is sectional drawing of the holster in the same as the above.

Hereinafter, an embodiment of a power tool system will be described with reference to the drawings.
As shown in FIG. 1, the power tool system of the present embodiment includes a holster 10 as a container and a power tool 30 housed in the holster 10.

  As shown in FIG. 1, the holster 10 is suspended, for example, at the position of the user's waist and accommodates the electric tool 30. The holster 10 includes a holster body 11 having a bottomed rectangular tube shape, and a lid 12 that can close the opening 11 a of the holster body 11. The lid 12 can be opened and closed by a hinge (not shown).

  As shown in FIGS. 2 and 3, the holster 10 includes an open / close sensor 13 that detects the open / close state of the lid 12. The open / close sensor 13 is configured by a push switch, for example. Here, the opening 11a of the holster 10 has a recess 11c at the opening end 11b, and the opening / closing sensor 13 constituted by the push switch is disposed in the recess 11c. When the lid portion 12 is closed, the convex portion 12a formed on the lid portion 12 maintains the state where the open / close sensor 13 formed of a push switch is pressed, and the lid portion 12 is opened. In this case, the open / close sensor 13 is opened.

  As shown in FIGS. 1 and 3, the holster 10 includes a fan 15. The fan 15 is provided closer to the opening 11a on the side surface 11d of the square cylindrical portion of the holster body 11. The fan 15 can generate an air flow inside the holster 10.

As shown in FIG. 1, a power transmission coil 14 is disposed on the lid portion 12 of the holster 10.
As shown in FIG. 1, the electric tool 30 is a tool such as an electric screwdriver or an electric drill, and is driven by operation of an operation switch (not shown). Moreover, the electric power tool 30 of this embodiment is provided with the power receiving part 31, the holding part 32, the main-body part 33, and the bit holding | maintenance part 34 in this order from the base end side to the front end side. In the power receiving unit 31, a power receiving coil 31 b (secondary coil) is housed in a housing portion 31 a having a substantially spherical shape on the proximal end side of the electric power tool 30. At this time, the power receiving coil 31b is disposed on the base end side of the power tool 30, that is, on the lid 12 side in a state where the power tool 30 is accommodated in the holster 10, and is disposed so as to face the power receiving coil 31b. .

  The bit holding part 34 is rotationally driven by a motor M and a driving mechanism D (see FIG. 3) housed in the main body part 33 of the electric tool 30. A tip tool such as a drill can be attached to the bit holding portion 34.

  The electric tool 30 configured as described above is accommodated such that the bit holding portion 34 side is positioned on the bottom 11 e side of the holster main body portion 11. Here, in the bottom portion 11e of the holster main body portion 11, an insertion hole 11f through which the bit holding portion 34 can be inserted is formed in the approximate center. And the electric power tool 30 is accommodated in the holster 10 in a state where the bit holding portion 34 is inserted into the insertion hole 11f, so that the power receiving portion 31 is positioned on the lid portion 12 side. At this time, the fan 15 is disposed so as to be able to send wind (airflow) to the gap between the power reception unit 31 and the power transmission coil 14, so that the power reception unit 31 (power reception coil 31 b) and the power transmission are performed. Foreign matter between the coil 14 and the coil 14 can be removed.

Next, the electrical configuration of the power tool system will be described.
As shown in FIG. 3, the holster 10 includes a connector 16 for connecting an AC adapter 50 connected to a commercial power source, a battery pack 17, an inverter circuit 18, the power transmission coil 14, and the open / close sensor 13. The lid opening / closing detection circuit 19 and the container side control circuit 20 are provided.

  The battery pack 17 is composed of a secondary battery and can be charged. For this reason, the holster 10 can be easily carried by removing the AC adapter 50 from the connector 16. The battery pack 17 is electrically connected to the inverter circuit 18, the open / close sensor 13, and the lid open / close detection circuit 19, and is supplied with power.

  The inverter circuit 18 receives the drive power from the battery pack 17 and oscillates to generate a high-frequency current. The inverter circuit 18 is electrically connected to the power transmission coil 14 and allows the generated high-frequency current to flow through the power transmission coil 14. Thereby, the power transmission coil 14 generates an alternating magnetic flux when a high-frequency current is applied.

  The lid open / close detection circuit 19 receives a sensor signal from the open / close sensor 13 as to whether or not the open / close sensor 13 is pressed. For example, the lid open / close detection circuit 19 receives a sensor signal from the open / close sensor 13 indicating that the lid 12 is closed when the open / close sensor 13 is pressed by the convex portion 12 a of the lid 12. The lid opening / closing detection circuit 19 receives a sensor signal indicating that the lid 12 is in an open state from the opening / closing sensor 13 when the opening / closing sensor 13 is not pressed.

  The lid open / close detection circuit 19 receives the sensor signal from the open / close sensor 13 and sends a signal indicating either the open state or the closed state of the lid 12 to the container side control circuit 20 to the container side control circuit 20. Output.

  The container-side control circuit 20 controls the drive of the inverter circuit 18 in response to a signal indicating either the open state or the closed state of the lid portion 12 input from the lid open / close detection circuit 19. Specifically, when receiving the signal in the closed state, the container-side control circuit 20 drives the inverter circuit 18 to generate a high-frequency current to flow to the power transmission coil 14 side. On the other hand, when receiving the open signal, the container-side control circuit 20 stops the generation of the high-frequency current by the inverter circuit 18 so that no current flows to the power transmission coil 14 side. For this reason, non-contact electric power feeding to the electric tool 30 side is possible only when the lid portion 12 of the holster 10 is in the closed state.

As shown in FIG. 3, the electric tool 30 includes a power receiving coil 31 b, a rectifier circuit 35, a battery pack 36, and a tool side control circuit 37.
The power receiving coil 31b generates an induced current by electromagnetic induction by being close to the power transmitting coil 14.

The rectifier circuit 35 rectifies the induced current generated in the power receiving coil 31 b and supplies the rectified DC voltage to the battery pack 36.
The battery pack 36 is composed of a secondary battery, is charged when a DC voltage is supplied from the rectifier circuit 35, and supplies power to the tool side control circuit 37 and the motor M.

  The tool side control circuit 37 controls the drive of the motor M, and supplies the drive current to the motor M by the electric power from the battery pack 36 to rotationally drive the motor M. The output shaft of the motor M is drivingly connected to the bit holding unit 34 at the tip via the driving mechanism D, and when the motor M is driven to rotate, the bit holding unit 34 is driven to rotate.

Next, the operation of the power tool system of this embodiment will be described.
The electric power tool system of the present embodiment can accommodate the electric power tool 30 in the holster 10. When the open / close sensor 13 is pressed and the lid 12 is determined to be closed by the lid open / close detection circuit 19 while the electric tool 30 is housed in the holster 10, the container side control circuit 20 Drive. At this time, since the wind (airflow) generated by the fan 15 passes between the coils (between the power transmission coil 14 and the power reception coil 31b), foreign matter should be interposed between the power transmission coil 14 and the power reception coil 31b. However, it is designed to be removed. Further, since the surface of the power receiving unit 31 that accommodates the power receiving coil 31b has a substantially spherical shape, foreign matters and the like are easily slipped off. Thereby, it is suppressed more reliably that a foreign material is interposed between the power transmission coil 14 and the power receiving coil 31b.

  The container-side control circuit 20 generates a high-frequency current by the inverter circuit 18 and passes it through the power transmission coil 14 after a predetermined time has elapsed since the fan 15 was driven. Then, an alternating magnetic flux is generated when the power transmission coil 14 is energized with a high-frequency current, and an induction current is generated by electromagnetic induction in the power receiving coil 31b in the environment. Then, the induced current is rectified by the rectifier circuit 35 to generate a DC voltage, and the DC voltage is supplied to the battery pack 36 to charge the battery pack 36.

  On the other hand, even when the electric tool 30 is housed in the holster 10, if the lid 12 is determined to be open by the lid opening / closing detection circuit 19 without the opening / closing sensor 13 being pressed, the container-side control circuit 20 Does not start driving the fan 15. At this time, the high frequency current is not generated by the inverter circuit 18 or is stopped when it is generated. Thus, in the situation where the lid 12 is in the open state and foreign matter is likely to be mixed into the holster 10, the battery pack 36 of the electric tool 30 is prevented from being charged. As a result, the occurrence of unexpected heating due to the presence of foreign matter between the coils 14 and 31b is suppressed.

Next, the effect of this embodiment will be described.
(1) The electric tool system includes a lid 12 that can close the opening 11 a of the holster 10, and has an open / close sensor 13 that detects an open / closed state of the lid 12. Thereby, it is suppressed that a metal foreign material mixes in the holster 10 by closing the cover part 12. In addition, since the open / close sensor 13 is provided, the open / closed state of the lid 12 can be detected, and the lid 12 is in a state where it is difficult for metal foreign matter to enter the holster 10, and the holster 10 is electrically operated. Power can be supplied to the tool 30 side. Further, even when a metal foreign object is mixed in the holster 10 in a state where the lid 12 is closed, the foreign object between the power receiving coil 31 b and the power transmitting coil 14 can be removed by the air flow of the fan 15. From these things, generation | occurrence | production of the unexpected heating by the metal foreign material between the coils 14 and 31b can be suppressed.

  (2) Since the open / close sensor 13 employs a push switch, the open / close state of the lid 12 is detected by detecting whether or not the lid 12 is physically close to the opening 11a of the holster 10. be able to.

  (3) Since the power receiving coil 31b provided in the electric power tool 30 is accommodated in the substantially spherical accommodating portion 31a, the surface of the accommodating portion 31a is spherical. Thereby, since it becomes difficult for a foreign material (metal foreign material) to remain on the surface of the accommodating part 31a, it can suppress that a foreign material intervenes between the receiving coil 31b and the power transmission coil 14. FIG. As a result, it is possible to further suppress the occurrence of unexpected heating due to the metal foreign matter between the coils 14 and 31b.

  (4) The power transmission coil 14 is disposed on the lid 12, and the power reception coil 31 b faces the power transmission coil 14 in a state where the electric tool 30 is accommodated in the holster 10, the lid 12 is closed, and the opening 11 a is closed. It arrange | positions in the mode to do. Thereby, the power receiving coil 31b and the power transmission coil 14 can be opposed to each other, and power can be efficiently supplied to the power tool 30 side.

In addition, you may change the said embodiment as follows.
-In above-mentioned embodiment, it was comprised so that the surface of the accommodating part 31a might become spherical shape by setting it as the substantially spherical accommodating part 31a, However, Not only this but a slope may be sufficient. As such a slope, for example, when the coils 14 and 31 b face each other, a surface that is inclined with respect to a plane orthogonal to the straight line X connecting the coils 14 and 31 b with the shortest distance is conceivable. With such a configuration, when the straight line X is in a state along the vertical direction, it is possible to allow foreign matter to escape in the direction of gravity (downward in the vertical direction). Further, even if the inclined surface has a conical shape such as a cone or a polygonal pyramid, it is possible to allow foreign matter to escape in the gravitational direction (downward in the vertical direction). From these things, even if the surface of the accommodating part 31a is a slope, it becomes possible to show the effect similar to (3) of the said embodiment.

The shape of the accommodating portion 31a may be a shape other than a spherical surface or a slope.
In the above embodiment, the push switch is used as the configuration of the open / close sensor 13 that detects the open / closed state of the lid 12 based on whether or not the lid 12 is physically close to the opening 11a. May be.

For example, as shown in FIG. 4, a light amount detection sensor 40 may be employed to detect the open / closed state of the lid 12 by detecting the light amount in the space in the holster 10.
In the above embodiment, one power transmission coil 14 is provided on the holster 10 side and one power reception coil 31b is provided on the power tool 30 side, but the present invention is not limited thereto.

  For example, as shown in FIGS. 5 to 7, a configuration may be adopted in which a plurality of power transmission coils 14 (four in FIG. 5) are provided on the holster 10 side and one power reception coil 31 b is provided on the power tool 30 side. In the configuration of FIG. 5, a plurality of power transmission coils 14 are arranged at equal angular intervals on the inner peripheral surface of the holster 10.

  As shown in FIGS. 6 and 7, the holster 10 includes a selection circuit 41 for selecting the power transmission coil 14 having the highest coupling coefficient from the plurality of power transmission coils 14 and an A / D converter (ADC) 42. The selection circuit 41 includes switching elements 41a and 41b and a capacitor 41c. A switching element 41 a and a capacitor 41 c are provided between the inverter circuit 18 and each power transmission coil 14. A switching element 41 b is provided between each capacitor 41 c and the A / D converter 42.

  Then, the container-side control circuit 20 excites and operates each power transmission coil 14 individually with respect to the switching element 41a constituting the selection circuit 41 before feeding. And the container side control circuit 20 acquires the voltage at that time via the A / D converter 42, and uses the power transmission coil 14 with the highest voltage. Incidentally, it is preferable to select the value of the capacitor 41c so that the resonance is strongest when the power transmission coil 14 is directly facing the power reception coil 31b.

  Further, in the above modification, power is fed (transmitted) between the power transmission coil 14 and the power reception coil 31b having the strongest resonance (highest voltage) among the power transmission coils 14 provided in plurality. Not limited to. For example, when facing a plurality of power transmission coils 14 simultaneously due to the shape and size of the power reception coil 31b, a plurality of power transmission coils 14 to be excited may be provided. Even in this case, it is preferable to detect the strength of resonance (power transmission coil 14 having a high voltage) as in the above-described modification, and determine the facing state based on a voltage threshold value determined by specifications and the like.

-In above-mentioned embodiment, although it was set as the structure which provides the power transmission coil 14 in the cover part 12, it is not restricted to this.
For example, as shown in FIGS. 8 (a) and 8 (b), the power transmission coil 14 is provided so as to be wound along the inner peripheral surface 11 g of the holster main body 11, and the pair of power reception coils 31 b You may wind and provide along the outer surface 30a of the electric tool 30 facing the surrounding surface 11g. The power transmission coil 14 may be provided directly on the inner peripheral surface 11g or with another member interposed between the inner peripheral surface 11g and the inner peripheral surface 11g.

  Although not specifically mentioned in the above embodiment, for example, as shown in FIG. 9, a holding portion 43 that follows the shape of the main body portion 33 of the electric power tool 30 may be provided on the bottom portion 11 e of the holster main body portion 11. . Thereby, the electric tool 30 can be more reliably held in the holster 10, and the relative displacement between the power transmission coil 14 and the power reception coil 31b can be suppressed.

  Although not specifically mentioned in the above embodiment, for example, as shown in FIG. 10, the body portion 33 and the gripping portion of the electric tool 30 at a midway position in the longitudinal direction of the holster body portion 11 (the insertion direction of the electric tool 30). You may have the holding | maintenance part 44 which followed the shape of 32. Thereby, the electric tool 30 can be more reliably held in the holster 10, and the relative displacement between the power transmission coil 14 and the power reception coil 31b can be suppressed.

  Although not particularly mentioned in the above embodiment, for example, as shown in FIG. 11, the lid portion 12 of the holster 10 may have a holding portion 45 that follows the shape of the power receiving portion 31 of the electric power tool 30. The holding part 45 comes into contact with the power receiving part 31 when the lid 12 is closed after the electric tool 30 is accommodated in the holster 10. At this time, the main body 33 of the electric power tool 30 is in a state where the tip of the main body 33 is in contact with the bottom 11 e of the holster main body 11 in the insertion direction of the electric power tool 30. Thereby, the holding force of the electric power tool 30 can be increased by the lid portion 12 (holding portion 45) and the holster main body portion 11 (bottom portion 11e), and the relative displacement between the power transmission coil 14 and the power receiving coil 31b is suppressed. Is possible.

In the above embodiment, the battery pack 17 is provided in the holster 10, but a configuration in which the battery pack 17 is omitted may be employed as shown in FIG.
In the above embodiment, the fan 15 is provided in the holster 10 as a container, and the foreign matter between the power receiving coil 31b and the power transmitting coil 14 is removed by the airflow generated from the fan 15, but this is not restrictive. For example, a configuration in which the fan 15 is provided in the electric power tool 30 and foreign matters are removed by an air flow generated from the fan 15 may be employed. Further, a configuration may be adopted in which a vibration motor is provided in the holster 10 or the electric tool 30 and foreign matters are removed using vibration generated by the vibration motor.

Moreover, you may employ | adopt the structure which generate | occur | produces a vibration using the motor M with which the electric tool 30 is equipped. As an example, a configuration as shown in FIGS. 13 and 14 can be considered.
As shown in FIG. 13, a protrusion 34a is provided on a substantially cylindrical bit holding portion 34 that is rotationally driven by a motor.

  As shown in FIG. 14, the bottom portion 11 e of the holster main body portion 11 includes a vibrating portion 46 having an eccentric weight 46 a. The vibration part 46 includes an engagement protrusion 46b that engages with the protrusion 34a in the circumferential direction (rotation direction of the motor M). As a result, the bit holding portion 34 is engaged with the engagement protrusion 46b, whereby the vibration portion 46 is rotated. At this time, since the vibration unit 46 includes the eccentric weight 46a, it is possible to generate vibration by the rotation of the eccentric weight 46a. Moreover, you may employ | adopt the structure which removes a foreign material only by the vibration which arises naturally with the motor with which the electric tool 30 is equipped. In addition, vibration may be generated by attaching an eccentric weight to the motor M provided in the electric tool 30.

In the above embodiment, the holster main body 11 is a bottomed square cylinder, but may be another bottomed polygonal cylinder or a bottomed cylinder.
In the above embodiment, for example, the holster 10 that is suspended and used at the position of the user's waist is used as the storage device. However, the storage device is not limited to this as long as it is a storage device with a lid that stores the electric tool 30.

  -You may combine the said embodiment and said each modification suitably.

  DESCRIPTION OF SYMBOLS 10 ... Holster (container), 11a ... Opening part, 11g ... Inner peripheral surface, 12 ... Cover part, 13 ... Opening / closing sensor (opening / closing detection part), 14 ... Power transmission coil, 15 ... Fan (foreign substance removal means), 30 ... Electric tool, 30a ... outer surface, 31a ... accommodating part (coil accommodating part), 31b ... receiving coil.

Claims (7)

A power tool having a power receiving coil; and a container having a power transmission coil as well as the power tool.
A lid that can close the opening of the container;
An open / close detection unit for detecting an open / closed state of the lid,
An electric power tool system comprising: at least one of the electric power tool and the container, a foreign material removing means for removing foreign material between the power receiving coil and the power transmitting coil by at least one of vibration and air flow. In the electric tool system according to claim 1,
The open / close detection unit detects an open / close state of the lid by detecting a light amount of a space in the container. In the electric tool system according to claim 1,
The open / close detection unit detects an open / closed state of the lid by detecting whether or not the lid is physically close to an opening of the container. In the electric tool system according to any one of claims 1 to 3,
The power receiving coil provided in the electric tool is accommodated in a coil accommodating portion provided in the electric tool,
The surface of the said coil accommodating part is a spherical surface or a slope, The electric tool system characterized by the above-mentioned. In the electric tool system according to any one of claims 1 to 4,
The power transmission coil is disposed on the lid,
The power receiving coil is disposed in such a manner that the power receiving coil is opposed to the power transmitting coil in a state where the power tool is accommodated in the container, the lid is closed, and the opening is closed. . In the electric tool system according to any one of claims 1 to 5,
A plurality of power transmission coils are arranged at equiangular intervals on the inner peripheral surface of the container,
The power tool system, wherein power is supplied from at least one power transmission coil of the plurality of power transmission coils to one power receiving coil provided on the power tool side. In the electric tool system according to any one of claims 1 to 5,
The power transmission coil is provided to be wound along the inner peripheral surface of the container,
The power receiving coil system is characterized in that the power receiving coil is provided along an outer surface of the power tool facing the inner peripheral surface.