JP5248931B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool with illumination having a configuration in which power generation is performed using rotation of a rotating body, and a lighting tool is turned on with the electric power obtained by the power generation.

  In a power tool using a household AC (alternating current) power supply, a double insulation structure is generally used in which a basic insulation is applied to an internal electrical wiring and a protective insulation is further provided. In the electric tool having the double insulation structure, for example, when an illuminating device is attached, when an AC power source is used as a power source of the illuminating device, the wiring for the illuminating device needs to have a double insulating structure. Generally, since a light emitting diode is used as a light source of a lighting fixture, the voltage of an AC power source is stepped down by a transformer, a resistor or a capacitor, rectified by a rectifier, and then supplied to the light emitting diode. At this time, the voltage applied to the light emitting diode is a direct current (DC) low voltage, but when it is stepped down by a resistor or a capacitor, a double insulation structure is required. Thus, since it is necessary to make wiring etc. into a double insulation structure, the cost at the time of attaching a lighting fixture becomes high.

Patent Document 1 discloses a technique in which a power tool is provided with a generator for a lighting tool and an AC or DC power source is not used as a lighting power source.
As shown in FIG. 6, the generator G for lighting equipment includes a stator 104 that is coaxially fixed to the outside of the case 101 of the electric power tool 100, and a rotor 106 that is coaxially attached to the tip tool 102. It has. The rotor 106 includes a plurality of magnets 107 on the outer peripheral surface, and a hexagonal hole 106h is formed in the central axis direction. The hexagonal columnar tip tool 102 is fitted into the hexagonal hole 106h of the rotor 106 from the axial direction. As a result, the rotor 106 rotates integrally with the tip tool 102. The stator 104 is provided with a pair of restricting members 104e for restricting movement of the rotor 106 in the axial direction, and a coil 104c is provided at a position surrounding the rotor 106 on the radially outer side of the restricting members 104. Is provided. As a result, when the rotor 106 rotates with the rotation of the tip tool 102, an induced electromotive force is generated in the coil 104c to generate electric power, and the lighting device 109 is turned on by the electric power generated by the generated electric power.

JP 2002-166374 A

  However, since the generator G for lighting equipment described above fixes the stator 104 to the outside of the case 101 of the electric power tool 100, there is a problem that the electric power tool 100 increases in size. Furthermore, since the weight of the electric power tool 100 is increased, the handling of the electric power tool 100 becomes troublesome.

  The present invention was made to solve the above problems, and the problem to be solved by the present invention is to separate the power supply for lighting from the main power supply, so that even if a generator for lighting equipment is provided, This is to prevent the power tool from becoming large.

The above-described problems are solved by the inventions of the claims.
The invention according to claim 1 is an illuminated electric tool configured to generate electric power by utilizing rotation of a rotating body and to turn on an illuminator with electric power obtained by the electric power generation, and rotating a motor for rotating the tool A disk-like blower fan attached coaxially to the shaft, a plurality of recesses formed in the blower fan in a state of being arranged in the circumferential direction of the blower fan, and the respective recesses of the blower fan And a plurality of magnets fixed to the blower fan, a coil that is installed in the vicinity of the blower fan, and that generates an induced electromotive force in response to a change in magnetic flux accompanying the movement of the magnet,
And an electric circuit for guiding a current flowing through the coil to a lighting fixture.

  According to the present invention, a plurality of magnets are fixed to a blower fan used for cooling a motor or the like in an electric power tool, and a lighting tool is turned on with electric power generated by the magnets and coils. In other words, an existing blower fan can be used as a generator rotor, and a single coil can be provided instead of the stator of the generator. For this reason, an electric tool does not enlarge like the case where the generator which consists of a rotor and a stator is newly provided.

According to invention of Claim 2, the magnet arranged in the circumferential direction of the ventilation fan is comprised so that the position of N pole and S pole may become reverse in the arrangement order.
For this reason, the change of the magnetic flux added to a coil becomes large, and the electric energy obtained by electric power generation becomes large.

According to invention of Claim 3, it is provided with a ring-shaped lid member which closes up a plurality of crevices of a blower fan , and magnets are stored in the crevice, and when these crevices are closed by the lid member, It is fixed to the blower fan.
For this reason, it becomes difficult to generate | occur | produce the malfunction that a magnet remove | deviates from a ventilation fan with centrifugal force.
According to invention of Claim 4, the magnet is being fixed to the periphery of a ventilation fan, It is characterized by the above-mentioned.
For this reason, when the space | interval of a magnet is made constant, the number of the magnets which can be fixed to a ventilation fan can be increased.

  According to the present invention, an existing blower fan can be used as a rotor of a generator, and it is only necessary to provide a single coil instead of the stator of the generator, so that the power tool does not increase in size.

(Embodiment 1)
Hereinafter, based on FIG. 1 to FIG. 5, the illuminated electric tool according to Embodiment 1 of the present invention will be described. The electric tool according to this embodiment is a marnoco, FIG. 1 is an overall perspective view of the marnoco as seen from the left front, and FIG. 2 is an exploded perspective view of the marnoco as seen from the right front. 3 is a side view showing the positional relationship between the blower fan constituting the rotor of the generator and the coil constituting the stator, FIG. 4 is an exploded perspective view of the generator, and FIG. 5 is a schematic diagram showing the electric circuit of the lighting fixture. FIG.
Here, front and rear, right and left, and upper and lower in the figure correspond to front and rear, left and right, and top and bottom of a marlinoko.

<About the configuration outline of Marunoco 10>
As shown in FIG. 1, the marnoco 10 of the present embodiment includes a flat rectangular base 12, a tilt mechanism 13 provided on the front and rear of the base 12 (only the front side is shown in FIG. 1), and a front and rear tilt mechanism. The motor 14, the speed reducer 15, and the saw blade 20 are connected to the base 12 via 13. The motor 14, the speed reducer 15, and the saw blade 20 are configured to be tiltable within a certain angle range from a state in which the axis is parallel to the lower surface of the base 12 by the front and rear tilt mechanisms 13. A handle 16 that is gripped by the user is attached to the outer peripheral surface of the motor housing 14h at the position of the base end (near the speed reducer 15). A trigger switch 17 that activates the motor 14 is provided in front of the grip 16c of the handle 16.
A rotating shaft 14s (see FIG. 2) of the motor 14 is connected to a gear mechanism (not shown) of the speed reducer 15, and a saw blade 20 is coaxially attached to a spindle 15x that is an output shaft of the speed reducer 15. FIG. 2 shows a state where the saw blade 20 is removed.
The outer periphery of the saw blade 20 is covered with a blade case 25u at a portion above the base 12, and a portion protruding downward from the base 12 is covered with a movable blade case 25m (see FIG. 1). The movable blade case 25m is configured such that when the saw blade 20 cuts a flat plate (not shown) that is a material to be cut, the movable blade case 25m is pressed by the flat plate and can be retracted in the circumferential direction.

<About the lighting fixture 30 and the generator 40>
The housing 15h of the speed reducer 15 is provided with a lighting tool 30 that illuminates a flat plate cutting portion of the saw blade 20 obliquely downward. The illuminator 30 includes a case portion 31 that houses three light-emitting diodes LED1 to LED3, and a light-transmitting lid portion 32 that closes an oblique downward opening in the case portion 31. As shown in FIG. 5, the light emitting diodes LED <b> 1 to LED <b> 3 of the illuminating tool 30 are connected to an electric circuit 50 including a generator 40.

  As shown in FIGS. 2 to 4 and the like, the generator 40 includes a blower fan 41 attached coaxially to the rotating shaft 14s of the motor 14. The blower fan 41 is a fan for cooling the motor 14 and rotating chips and the like by rotating integrally with the rotating shaft 14 s of the motor 14. The blower fan 41 is formed in a disk shape, and a plurality of blades 41f are formed at equal intervals in the circumferential direction on the surface of the disk (on the rotor 14a side of the motor 14). Moreover, as shown in FIG. 4 etc., many (for example, 12 pieces) square recessed parts 41k are formed in the peripheral part of the back surface of the ventilation fan 41 at equal intervals in the circumferential direction. And the square magnet 43 is accommodated in each square recessed part 41k, and it adheres with the adhesive agent etc.

As shown in FIG. 4, the magnet 43 is configured such that the positions of the N pole and the S pole are reversed in the order of arrangement in the circumferential direction. Each square recess 41k is closed by a ring-shaped lid member 45 in a state where the magnet 43 is accommodated. That is, the blower fan 41 functions as a rotor of the generator 40. Here, as the magnet 43, for example, a rare earth magnet is used.
As shown in FIG. 3, a coil 47 of the generator 40 is fixed to the inner peripheral surface of the housing 14 h of the motor 14 at a position radially outside the peripheral edge of the blower fan 41. As a result, when the trigger switch 17 of the handle 16 is pulled and the blower fan 41 rotates together with the motor 14, the magnetic flux changes with the movement of the magnet 43, and a current due to the induced electromotive force flows through the coil 47.

As shown in FIG. 5, the coil 47 is connected to input terminals e1 and e2 of a diode bridge 52 which is a rectifier of the electric circuit 50. The light emitting diodes LED1 to LED3 of the lighting fixture 30 are connected in parallel to the output terminals p1 and p2 of the diode bridge 52 via the voltage adjusting resistor 54.
With the above configuration, when an induced electromotive force is generated in the coil 47 and the input terminal e1 of the diode bridge 52 becomes + and the input terminal e2 becomes-, the current is emitted from the input terminal e1 through the output terminal p2 and the resistor 54 to the light emitting diode. It flows from LED1 to LED3 and returns from the output terminal p1 to the input terminal e2. Further, when the input terminal e1 of the diode bridge 52 becomes-and the input terminal e2 becomes +, the current flows from the input terminal e2 to the light emitting diodes LED1 to LED3 via the output terminal p2 and the resistor 54, and from the output terminal p1 to the input terminal. Returned to e1.
That is, when the trigger switch 17 is pulled and the motor 14 is rotated, power is generated by the magnet 43 and the coil 47 of the blower fan 41, and the lighting device 30 is turned on by the generated power.

<Advantages of Marunoco 10 according to this embodiment>
According to the marnoco 10 according to the present embodiment, the plurality of magnets 43 are fixed to the blower fan 41 used for cooling the motor 14, and the lighting device 30 is turned on with the electric power generated by the magnets 43 and the coil 47. It is. That is, the existing blower fan 41 can be used as a rotor of the generator, and the coil 47 may be provided alone instead of the stator of the generator. For this reason, the Marunoco 10 does not increase in size as in the case of newly providing a generator composed of a rotor and a stator.
The magnets 43 arranged in the circumferential direction of the blower fan 41 are configured such that the positions of the N pole and the S pole are reversed in the order of arrangement. For this reason, the change of the magnetic flux added to a coil becomes large, and the electric energy obtained by electric power generation becomes large.
In addition, the magnet 43 is fixed to the blower fan 41 when the rectangular recess 41k is closed by the lid member 45 in a state of being accommodated in the rectangular recess 41k. For this reason, it becomes difficult to generate | occur | produce the malfunction that the magnet 43 remove | deviates from the ventilation fan 41 with centrifugal force.
Moreover, since the magnet 43 is being fixed to the periphery of the ventilation fan 41, when the space | interval of the magnet 43 is made constant, the number of the magnets 43 which can be fixed to the ventilation fan 41 can be increased.

<Example of change>
Here, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in this embodiment, although the example which fixes the magnet 43 to the peripheral part of the back surface of the ventilation fan 41 was shown, the structure which fixes the magnet 43 to the outer peripheral surface of the ventilation fan 41 is also possible.
Moreover, although the example which fixes the 12 magnets 43 to the ventilation fan 41 was shown, according to the diameter dimension of the ventilation fan 41, it is also possible to change the number of the magnets 43 suitably.
Moreover, although the example which makes the number of light emitting diode LED of the lighting fixture 30 three was shown, the number of light emitting diode LED can be changed suitably.
Furthermore, although the marnoco 10 was illustrated as an electric tool, it is also possible to apply this invention to a drill, a screw driver, etc.

It is the whole perspective view seen from the left front of the electric tool (marunoko) with illumination concerning Embodiment 1 of the present invention. It is the disassembled perspective view seen from the right front of Marunoco. It is a side view showing the positional relationship of the ventilation fan which comprises the rotor of the generator for lighting fixtures, and the coil which comprises a stator. It is a disassembled perspective view of the generator for lighting fixtures. It is a schematic diagram showing the electric circuit of a lighting fixture. It is a model longitudinal cross-sectional view showing the front-end | tip part of the conventional electric tool with a lighting fixture.

Explanation of symbols

14... Motor 14 h... Motor housing 14 s... Rotating shaft 20. Saw blade 30 .. lighting tool 40.・ Blower fan 41f... Blade 41k... Square recess 43... Magnet 45 .. lid member 47. ..Diode bridge LED1 ... Light emitting diode LED2 ... Light emitting diode LED3 ... Light emitting diode

Claims (4)

A power tool with illumination configured to generate electricity using rotation of a rotating body, and to turn on a lighting fixture with electric power obtained by the power generation,
A disk-shaped blower fan mounted coaxially with the rotation axis of the tool rotation motor;
A plurality of recesses formed in the blower fan in a state arranged in the circumferential direction of the blower fan,
A plurality of magnets housed in each recess of the blower fan and fixed to the blower fan;
A coil that is installed in the vicinity of the blower fan, receives a change in magnetic flux accompanying the movement of the magnet, and generates an induced electromotive force;
An electrical circuit for guiding the current flowing through the coil to a lighting device;
A power tool characterized by comprising: The electric tool according to claim 1,
The power tool characterized in that the magnets arranged in the circumferential direction of the blower fan are configured such that the positions of the N pole and the S pole are reversed in the order of arrangement. The electric tool according to claim 1 or 2,
A ring-shaped lid member that closes the plurality of recesses of the blower fan ,
The power tool, wherein the magnet is fixed to the blower fan when the recess is closed by the lid member in a state of being accommodated in the recess. The electric tool according to any one of claims 1 to 3,
The power tool, wherein the magnet is fixed to a peripheral edge of the blower fan.

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