JP2015174202A - Electrically-driven tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve easy wiring for a switch and small-sizing of a housing.SOLUTION: A grinder 1 in which a brushless motor 6 and a push button type switch 46 are accommodated in a cylindrical body housing 2, and a switch nob 60, which operates ON/OFF of the switch 46 by sliding operation in a longitudinal direction, is provided outside the body housing 2. In the grinder 1, the switch 46, which is to be accommodated in the cylindrical body housing 2, is accommodated in the body housing 2 in a forward-directed attitude such that a button 47 is positioned on a front side.

Description

  The present invention relates to a power tool such as a rechargeable grinder provided with a switch that is turned ON / OFF by a sliding operation of an operation member.

  In a power tool such as a grinder, a push button type switch for driving a motor is accommodated in a cylindrical housing, and a sliding operation in the front-rear direction is disclosed outside the housing as disclosed in Patent Document 1. Is provided with an operation member for turning on / off the switch.

JP 2013-226617 A

  In this case, a slide member that interlocks with the slide operation of the operation member is provided in the housing, and the slide member presses the button of the switch by the advancement of the slide member accompanying the forward slide operation of the operation member, thereby turning on the switch. The slide member is moved away from the button by the retraction of the slide member accompanying the backward slide operation of the operation member, and the switch is turned OFF. Therefore, since the switch is housed in the housing with the button facing backward, the lead wire is bent forward of the switch when wiring the lead wire pulled out from the switch to the controller behind the switch. There is a problem that wiring is difficult because it is necessary to route backward. In addition, since the lead wire is wired below the switch, the diameter of the housing is increased.

  Accordingly, an object of the present invention is to provide an electric tool that facilitates wiring of a switch and can achieve a reduction in the diameter of a housing.

In order to achieve the above object, according to the first aspect of the present invention, a motor and a push button type switch are accommodated in a cylindrical housing, and a sliding operation in the front-rear direction is performed outside the housing. An electric tool provided with an operating member for turning on / off a switch, wherein the switch is housed in a forward-facing posture with a button on the front side.
According to a second aspect of the present invention, in the configuration of the first aspect, a slide member that slides in the front-rear direction in conjunction with the operation member is provided in the housing, and the slide member advances between the slide member and the switch. According to the present invention, there is provided a pressing mechanism that presses the button of the switch according to the distance and moves away from the button according to the backward movement of the slide member.
According to a third aspect of the present invention, in the configuration of the second aspect, the pressing mechanism is rotatably supported in the housing, one end is locked to the slide member, and the other end is positioned in front of the button. The other end includes a lever member that presses the button by rotating in accordance with the advance of the member.
According to a fourth aspect of the present invention, in the configuration of the third aspect, between the other end of the lever member and the button, a button member that is locked to the other end and moves integrally back and forth is arranged. With rotation, the other end presses the button via the button member.

  According to the present invention, since the switch is accommodated in a forward-facing posture, the switch can be easily wired and the diameter of the housing can be reduced.

It is a perspective view of a rechargeable grinder. It is a longitudinal cross-sectional view of a rechargeable grinder (switch OFF state). It is the sectional view on the AA line of FIG. It is a perspective view from the back of a stator. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a longitudinal cross-sectional view of a rechargeable grinder (switch ON state). It is CC sectional view taken on the line of FIG. It is a perspective view of the latter half part (a terminal block is omitted) and an inlet cover of a main part housing. It is the perspective view which looked at the inlet cover from the back. It is the perspective view which looked at the battery mounting part (a terminal block is abbreviate | omitted) from back. It is sectional drawing which cut | disconnected the battery mounting part by the surface parallel to a guide wall behind a guide wall. It is a partial longitudinal cross-sectional view of the rechargeable grinder of the example of a change (switch OFF state). It is the DD sectional view taken on the line of FIG. It is a partial longitudinal cross-sectional view of the rechargeable grinder of the example of a change (switch ON state). It is the EE sectional view taken on the line of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a perspective view of a rechargeable grinder as an example of an electric tool, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a sectional view taken along line AA of FIG. A rechargeable grinder (hereinafter simply referred to as “grinder”) 1 is connected to a front of a cylindrical main body housing 2 that houses a brushless motor 6 at a front portion, and a gear housing 3 with a spindle 7 protruding downward is connected to the main body. A battery pack 5 serving as a power source is mounted on a battery mounting portion 4 formed at the rear end of the housing 2. The main body housing 2 is formed by assembling a pair of left and right halved housings 2a, 2b with screws 8, 8,..., The accommodating portion of the brushless motor 6 is the thickest cylindrical portion 9, and the rear thereof is from the cylindrical portion 9 The rectangular tube portion 10 that accommodates a switch 46 to be described later is also formed. The rectangular tube portion 10 has a length that allows the operator's four fingers to be used, and is used as a grip that is gripped during use. That is, a small-diameter grip that is easier to grip rearward than the brushless motor 6 is formed.

  The brushless motor 6 is an inner rotor type composed of a stator 11 and a rotor 12 inside thereof. The stator 11 is provided on a cylindrical stator core 13 formed of a plurality of laminated steel plates and end faces in the axial direction of the stator core 13. A front insulator 14 and a rear insulator 15, and six coils 16, 16... Wound around the stator core 13 via the front and rear insulators 14, 15. The rear insulator 15 includes a sensor circuit board 17 and A short-circuit member 18 is attached.

The rear insulator 15 is a ring-shaped integral product having the same diameter as the stator core 13, and as shown in FIG. 4, each of the six holding portions 15 a, 15 a. Zing terminals 19, 19,... Are held. The coil 16 is wound around each tooth of the stator core 13 by one winding in order, and each winding 16a connecting the coils 16 and 16 is sandwiched between the fusing terminals 19 so that each fusing is performed. The terminal 19 is electrically connected. A pair of positioning recesses 15 b and 15 b are formed on the left and right side surfaces of the rear insulator 15.
The sensor circuit board 17 is equipped with three rotation detection elements (not shown) that detect the position of the permanent magnet 20 provided on the rotor 12 and output a rotation detection signal, and have an outer diameter that fits inside each holding portion 15a. The signal line 21 of the rotation detecting element is drawn out from the upper part of the sensor circuit board 17.

  The short-circuit member 18 is a resin ring having the same diameter as that of the sensor circuit board 17, and four bosses 18 a, 18 a... That can be fitted from the front with screw bosses (not shown) provided on the rear insulator 15 on the outer periphery. Projecting integrally. Further, the short-circuit member 18 is a state in which three arc-shaped sheet metal members 22, 22... Each having a pair of short-circuit pieces 23, 23 projecting diagonally are superposed on each other in a non-contact state on a concentric circle. Insert molding. The short-circuit piece 23 projects radially from the short-circuit member 18 and corresponds to each fusing terminal 19, and a slit 23 a into which the fusing terminal 19 can be inserted is formed at the tip. The U-phase, V-phase, and W-phase power wires 24, 24... Are welded to each sheet metal member 22 and are drawn out from the lower portion of the short-circuit member 18.

  When this short-circuit member 18 is overlapped from the rear of the sensor circuit board 17 and fixed with screws 18b so that the screw bosses of the rear insulator 15 are inserted into the bosses 18a, the tips of the fusing terminals 19 are respectively connected to the corresponding short-circuit pieces 23. Plugged in. If the fusing terminal 19 and the short-circuit piece 23 are soldered in this state, the fusing terminals 19 positioned symmetrically with respect to each other are short-circuited by the sheet metal member 22. That is, the fusing terminals 19 that are electrically connected to the windings 16 a between the coils 16 and 16 that are wound around the stator core 13 in order are electrically connected to each other by three sheet metal members 22. It becomes so-called para-winding delta connection.

  Here, since the sensor circuit board 17 and the short-circuit member 18 are accommodated within the height dimension of the fusing terminal 19, the entire length of the brushless motor 6 can be minimized even if the short-circuit member 18 or the like is used. Furthermore, since all members except the signal line 21 and the power supply line 24 are accommodated in the outer diameter of the stator core 13, the outer diameter of the product is not increased and the product becomes compact. Since the signal line 21 is drawn from above and the power line 24 is drawn from below, wiring is easy. However, the signal line 21 may be attached upside down so as to be pulled out from below, or may be pulled out from above or below together with the power line 24.

The stator 11 assembled in this way is held at a coaxial position with the cylindrical portion 9 by support ribs 25, 25 projecting in the circumferential direction on the inner surfaces of the half housings 2a, 2b of the main body housing 2, respectively. A locking rib 25a for locking to a notch 14a provided in the front insulator 14 is provided in front of the support rib 25, and the positioning ribs 15b and 15b provided in the rear insulator 15 are fitted behind the support rib 25. The mating projections 25b and 25b (FIG. 12) are provided to perform front-rear positioning.
The short-circuit member 18 and the sensor circuit board 17 may be integrally formed, and the coil 16 may be a so-called Y connection.

On the other hand, the rotor 12 is disposed around the rotation shaft 26 at the axis, the substantially cylindrical rotor core 27 formed by laminating a plurality of steel plates, and fixed to the inside of the rotor core 27 4. Two plate-like permanent magnets (sintered magnets) 20. The permanent magnet 20 is fixed by adhesive and / or press-fitting in through holes formed so as to be respectively located on four sides of a square centering on the rotation shaft 26 in the cross section of the rotor core 27.
The rotary shaft 26 is pivotally supported by a bearing 29 held by a partition plate 28 interposed between the main body housing 2 and the gear housing 3, and has a tip projecting into the gear housing 3. A centrifugal fan 30 is attached to the rotating shaft 26 behind the partition plate 28, and the inner surface of the front end of the main body housing 2 in which the centrifugal fan 30 is accommodated is formed in a mortar shape that narrows toward the rear. The air flow generated in the radial direction can be guided forward. The partition plate 28 is provided with a through hole (not shown) so that an air flow from the centrifugal fan 30 can be sent into the gear housing 3.

The rear end of the rotating shaft 26 is pivotally supported by a bearing 32 held by a receiving plate 31 protruding from the left and right half housings 2a and 2b at the rear end of the cylindrical portion 9.
Further, in the rotor 12, a front stopper 33 is provided between the rotor core 27 and the centrifugal fan 30. The front stopper 33 is a disc made of brass and having the same outer diameter as the rotor core 27, and is fixed to the rotary shaft 26 coaxially with the rotor core 27. On the other hand, a rear stopper 34 is provided between the rotor core 27 and the rear bearing 32. After this, the stopper 34 is a disc made of brass and having an outer diameter smaller than that of the rotor core 27, and is fixed to the rotary shaft 26 coaxially with the rotor core 27. However, the outer diameter of the rear stopper 34 is larger than the inner circle surrounded by the four permanent magnets 20, and the rear stopper 34 is positioned behind each permanent magnet 20.

  The gear housing 3 is fixed by screwing four screws 35 penetrated from the front at the four corners into a screwing portion 36 provided on the outer periphery of the front end of the main body housing 2 via the partition plate 28. A bevel gear 37 is fixed to the front end of the rotating shaft 26 protruding into the gear housing 3 and meshes with a bevel gear 38 fixed to the upper end of the spindle 7. 39 is an exhaust port formed in the front surface of the gear housing 3, and 40 is a shaft lock capable of locking the rotation of the spindle 7 via the bevel gear 38 by a pushing operation. The spindle 7 is pivotally supported by upper and lower bearings 42 and 42 held by the gear housing 3 and a bearing box 41 assembled to the lower portion of the gear housing 3, and protrudes downward. At the lower end of the spindle 7 is a tip such as a disc-shaped grindstone. A tool 43 can be mounted. A wheel cover 45 is attached to the outer periphery of the bearing box 41 to cover the latter half of the tip tool 43 with a belt-like clamp 44.

  In the main body housing 2, 46 is a switch that is turned on when the button 47 is pressed. The holding rib 48 protruding from the inner surfaces of the half housings 2 a and 2 b causes the button 47 to be moved on the upper side in the rectangular tube portion 10. Held in a forward-facing position. Thereby, a space 49 for passing the power supply line 24 and the signal line 21 is formed below the switch 46. In addition, a partition wall 50 that projects between the brushless motor 6 and the switch 46 projects from the half housings 2a and 2b in front of the holding rib 48, and between the partition wall 50 and the switch 46, A change lever 51 is provided as a lever member that forms a pressing mechanism. As shown in FIG. 5, the change lever 51 is rotatably supported by being penetrated by pins 53 supported at both ends by support bosses 52 protruding from the inner surfaces of the half housings 2a and 2b. On the lower side of the pin 53, a cam portion 54 that is located in front of the button 47 of the switch 46 and bulges backward is formed. On the upper side of the pin 53, an arm portion 55 that protrudes upward is formed. . Above the change lever 51, a slide plate 57 is provided in the main body housing 2 as a slide member that can slide back and forth along an inner guide groove 56 in the front and rear direction that is recessed in the inner surface of the main body housing 2. The arm portion 55 of the change lever 51 is inserted into a connecting hole 58 provided at the rear end of the plate 57.

On the other hand, an outer guide groove 59 is formed on the upper outer surface of the main body housing 2 in the front-rear direction, and a switch knob 60 as an operation member is accommodated in the outer guide groove 59 so as to be movable back and forth. An L-shaped locking piece 61 protrudes downward from the lower surface of the switch knob 60, passes through a slit 62 in the front-rear direction formed in the main body housing 2, and protrudes into the main body housing 2. Is locked in a locking hole 63 provided at the front end.
Therefore, when the switch knob 60 is slid forward in the outer guide groove 59, the slide plate 57 is also slid forward and the rear end arm portion 55 is moved forward, so that the change lever 51 moves the pin 53. As shown in FIGS. 6 and 7, the cam portion 54 is swung rearward and the button 47 is pressed. This ON state is maintained by locking the projecting piece 60 a projecting downward at the front end of the switch knob 60 to the projecting portion 59 a projecting from the bottom front side of the outer guide groove 59.
On the contrary, when the switch knob 60 is slid rearward, the slide plate 57 slides rearward, the change lever 51 is rotated counterclockwise via the arm portion 55, and the cam portion 54 is separated from the button 47. However, a torsion spring 64 that engages the change lever 51 and the partition wall 50 is externally mounted on the pin 53 to urge the change lever 51 in the counterclockwise direction (switch OFF side).

  The battery pack 5 has a coupling portion 66 having a terminal (not shown) on an upper portion of an outer case 65 that accommodates a plurality of cells, and a pair of rail portions 67 and 67 project from both sides of the coupling portion 66. ing. The battery mounting portion 4 has an opening for receiving the coupling portion 66 of the battery pack 5 from above, and a pair of left and right guide rails 68 fitted to the rail portions 67 and 67 of the coupling portion 66 on both sides of the opening. 68 is protruded. A terminal block 69 provided with terminal plates 70 a and 70 b corresponding to the terminals of the coupling portion 66 is provided between the guide rails 68 and 68 upward. Therefore, when the battery pack 5 is fitted in the guide rails 68 and 68 from the upper side of the battery mounting portion 4 and is slid from the upper side in the vertical posture with the coupling portion 66 in front, the coupling portion 66 is obtained. And the terminal plates 70a and 70b of the terminal block 69 are electrically connected. Reference numeral 71 denotes a locking claw provided on the battery pack 5, which engages with a recess 72 provided in the battery mounting portion 4 in the mounted state to prevent the battery pack 5 from coming off. The battery pack 5 can be removed by retracting the locking claw 71 into the outer case 65 by operating the release button 73.

  In the battery mounting portion 4, a controller 74 is accommodated in front of the terminal block 69. This controller 74 is an aluminum, dish-shaped case comprising a circuit board 75 on which six FETs (not shown) corresponding to each coil 16 of the brushless motor 6, a capacitor 76, a microcomputer (not shown), an LED 77 and the like are mounted. 78, and is held by holding portions 79 and 79 provided vertically on the inner surfaces of the half housings 2a and 2b. Here, the lower holding portion 79 is positioned in front of the upper side, so that the controller 74 is supported in an inclined posture in which the lower end is positioned in front of the upper end with respect to the axis of the main body housing 2. Due to this inclination, even if the capacitor 76 is provided at the end of the circuit board 75, it can be positioned on the center side in the main body housing 2, and there is no need to provide a protruding shape on the main body housing 2 by the capacitor 76. Moreover, since the space | interval of the aluminum case 78 and the terminal block 69 becomes wide according to the inclination of the controller 74, possibility that both will conduct | electrically_connect becomes very small. The capacitor 76 may be provided with a longer electrode terminal and away from the circuit board 75.

The lower portion of the battery mounting portion 4 is a bulging portion 80 that swells downward from the rectangular tube portion 10, and a space 81 is formed between the controller 74 and the bulging portion 80 so as to communicate the front and rear of the controller 74. doing.
A plurality of LEDs 77 are mounted on the upper end side of the circuit board 75 and face a window 83 provided on an inclined portion 82 formed on the upper side of the battery mounting portion 4 so as to extend in substantially the same direction as the inclination of the controller 74. . In this window 83, a shielding plate 84 that partitions the LEDs 77 and a display plate 85 that covers the surface of the shielding plate 84 are provided to form a display unit 86 of a remaining battery capacity that can be visually recognized from the outside. . Here, since the display unit 86 extends in the vertical direction and the front-rear direction, the visibility of the display unit 86 is improved (FIG. 2).

On the other hand, air inlets 87 are formed on the left and right side surfaces of the battery mounting portion 4 between the terminal block 69 and the controller 74. The intake port 87 is formed in a triangular shape that becomes longer forward as it goes downward, in accordance with the shape of the space formed between the terminal block 69 and the inclined controller 74.
96 is an intake port cover that is attached to the side surface of the battery mounting portion 4 at the position of the intake port 87, and as shown in FIGS. 8 and 9, inside the triangular rubber frame 97 that is slightly larger than the intake port 87. Are inserted into the locking holes 100, 100... Provided on the side surface of the battery mounting portion 4. The locking pins 99, 99. By doing so, as shown in FIGS. 10 and 11, the air inlet 87 is covered with the metal mesh 98 and attached. A flange-shaped widened portion 99 a is formed at the distal end portion of the locking pin 99 so that resistance in the removal direction is generated when the locking pin 99 is inserted into the locking hole 100. With this air inlet cover 96, it is possible to prevent intrusion of foreign matter while allowing ventilation to the air inlet 87.

  8, 101 and 101 appearing on the side surface and the lower surface of the main body housing 2 are anti-slip recesses, and are formed long in the front-rear direction with a predetermined interval in the circumferential direction. In between, the anti-slip convex part 102 long in the front and rear is formed. The anti-slip concave portion 101 and the convex portion 102 are formed symmetrically so as to improve the catching of a finger holding the main body housing 2.

Further, a guide wall 88 is formed between the controller 74 and the intake ports 87, 87 on the inner surfaces of the half housings 2a, 2b. The guide wall 88 protrudes in parallel with the lower surface of the case 78 of the controller 74, but the protruding end portions do not contact each other, and a gap is provided between the guide walls 88 and 88. Accordingly, the outside air sucked from the left and right intake ports 87 is guided to the center of the battery mounting portion 4 by the guide walls 88, 88, and descends along the lower surface of the case 78 from the gap between the guide walls 88, 88 to the front. Will flow. As described above, the terminal plates 70a and 70b are disposed on the left and right sides, and the ventilation portion to the case 78 is disposed in the center, so that it is difficult for both to short-circuit.
Further, a plurality of left and right ribs 103, 103,... Are formed at equal intervals in the vertical direction on the back surface of each guide wall 88 so as to rectify and guide the outside air sucked from each intake port 87 to the center. It has become. A lattice-shaped groove 104 is formed at the center of the back surface of the case 78, and the groove 104 makes the back surface of the case 78 uneven to increase the contact area with the outside air.

  Therefore, the signal line 21 and the power line 24 of the brushless motor 6 are wired to the controller 74 through the space 49 below the switch 46, and the power line 89 of the terminal block 69 is wired to the controller 74 through the space 81 below the controller 74. . For this reason, the signal lines 21 and the power supply lines 24 are easily assembled and wired. Since the switch 46 is in a forward-facing posture with the button 47 on the front side, the lead wire 90 connected to the rear end of the switch 46 passes directly to the rear controller 74 and terminal block 69 without passing through the space 49. Wired with the shortest distance. As described above, since the power supply line 89 and the lead wire 90 extend from the rear side of the switch 46, it is not necessary to bypass the switch 49 so that the space 49 can be reduced and the rectangular tube portion 10 can be formed thinly. It becomes easy. Further, since there is no need to bend the lead wire 90, wiring can be performed easily.

  In the grinder 1 configured as described above, when the square tube portion 10 is gripped and the switch knob 60 is slid forward, the slide plate 57 advances as described above to rotate the change lever 51 and switch the switch 46. Turn it on. Therefore, the brushless motor 6 is driven by the power supply of the battery pack 5. That is, the microcomputer of the controller 74 obtains the rotation detection signal indicating the position of the permanent magnet 20 of the rotor 12 output from the rotation detection element of the sensor circuit board 17 to acquire the rotation state of the rotor 12, and sets the acquired rotation state. Accordingly, the ON / OFF of each switching element is controlled, and the rotor 12 is rotated by causing a current to flow sequentially to each coil 16 of the stator 11. Therefore, since the rotating shaft 26 rotates and the spindle 7 is rotated via the bevel gears 37 and 38, a polishing operation or the like by the tip tool 43 becomes possible.

Here, since the front stopper 33 and the rear stopper 34 are provided before and after the rotating rotor 12, the movement of each permanent magnet 20 in the front-rear direction is restricted, and the rotor core 27 is prevented from coming out. Therefore, there is no possibility that the permanent magnet 20 falls off, and the highly reliable brushless motor 6 can be used.
In addition, while the grinder 1 is in use, the display unit 86 notifies the remaining battery capacity by turning on the LED 77, but the visibility of the display unit 86 is improved by the tilted posture of the controller 74. Even when the controller 74 is tilted in this manner, the battery pack 5 is mounted in a posture orthogonal to the main body housing 2, so that the grinder 1 can be placed vertically (self-standing) with the battery pack 5 down. . Furthermore, the entire length of the grinder 1 does not extend.

On the other hand, when the centrifugal fan 30 rotates along with the rotation of the rotating shaft 26, outside air is sucked from the rear intake port 87 and passes between the ribs 103, 103, and the case of the controller 74 is guided by the guide wall 88. The space reaches the space 81 from the central portion of 78 and moves around the controller 74 from below to advance in the main body housing 2. Then, it passes between the stator 11 and the rotor 12 of the brushless motor 6 through the space 49, reaches the gear housing 3 from the main body housing 2, and is discharged from the exhaust port 39 to the outside. Due to this air flow, the controller 74 and the terminal block 69 are cooled, and the brushless motor 6 is also cooled. Particularly, in the controller 74, since the outside air is once guided to the central portion by the guide wall 88 and then flows to the outer peripheral side along the lower surface of the case 78, the contact area with the air is increased and the controller 74 is efficiently cooled.
When the switch knob 60 is slid rearward, the slide plate 57 moves backward to rotate the change lever 51 and turn off the switch 46, so that the driving of the brushless motor 6 is stopped.

Thus, according to the grinder 1 of the said form, the controller 74 is arrange | positioned adjacent to the terminal block 69 provided in the battery mounting part 4 in the main body housing 2, and electrically connected with the battery pack 5, By providing the air inlet 87 between the terminal block 69, the terminal block 69 can be suitably cooled in addition to the controller 74.
In particular, here, the brushless motor 6, the controller 74, and the terminal block 69 are arranged on a straight line, the controller 74 is inclined with respect to the straight line, and the battery 74 is disposed at the end of the inclined controller 74 near the terminal block 69. Since the display portion 86 of the remaining capacity is provided and the display portion 86 can be visually recognized through the window 83 provided in the battery mounting portion 4, the visibility of the display portion 86 is improved.
Further, by providing a guide wall 88 for guiding the outside air sucked from the intake port 87 to the central side of the controller 74 between the controller 74 and the intake port 87 on the inner surface of the main body housing 2, the controller 74 is further cooled. Done effectively.

On the other hand, according to the grinder 1 of the said form, when the switch 46 was accommodated in the forward attitude | position which the button 47 becomes a front, it becomes easy to wire the switch 46 and the diameter reduction of the main body housing 2 can also be achieved. .
Particularly, here, a slide plate 57 that slides in the front-rear direction in conjunction with the switch knob 60 is provided in the main body housing 2, and the switch 46 is moved between the slide plate 57 and the switch 46 according to the advance of the slide plate 57. The button 47 is pressed, and a pressing mechanism (change lever 51) that moves away from the button 47 in accordance with the backward movement of the slide plate 57 is provided. Therefore, the operability can be maintained.
Further, the pressing mechanism is rotatably supported in the main body housing 2, the upper end arm portion 55 is engaged with the slide plate 57, the lower end cam portion 54 is positioned in front of the button 47, and the slide plate 57 Since the cam portion 54 is formed by the change lever 51 that presses the button 47 by rotating in accordance with the forward movement, the pressing mechanism can be easily formed.

In the above embodiment, only the controller is inclined, but the terminal block may be inclined in the same manner, and the battery pack may be inclined with respect to the axis of the main body housing. In this case, the intake port formed between the controller and the terminal block that are parallel to each other is formed to have the same length in the front-rear direction.
In addition, the air inlet is not limited to the left and right sides of the battery mounting portion, and can be provided only on one side. In this case, the guide wall is only on one side. However, guide walls and ribs can be omitted.
Furthermore, the switch knob may be provided on the side surface instead of the upper surface of the main body housing. In this case, the change lever is supported so that it can rotate sideways.

  On the other hand, the pressing mechanism of the switch is not limited to the change lever of the above form, and can be changed as appropriate. For example, FIGS. 12 and 13 show a modified grinder 1A, with the brushless motor and gear housing side omitted. Here, the change lever 91 has upper and lower arm portions 92 and 92 projecting symmetrically with respect to the point, and in front of the switch 46, a small rib 93 projecting on the inner surface of the half housings 2a and 2b. A push button 94 as a member is provided so as to be movable back and forth, and the upper arm portion 92 of the change lever 91 is engaged with the connecting hole 58 at the rear end of the slide plate 57, and the lower arm portion 92 is pushed. The button 94 is locked in a locking hole 95 provided at the front end.

  In this modified example, when the switch knob 60 is in the retracted position, the slide plate 57 is also in the retracted position, and the change lever 91 is maintained at the rotational position in which the upper and lower arm portions 92 and 92 are aligned in the vertical direction. In this state, the push button 94 is in a position where it abuts against the button 47 and does not press the button 47 (the switch 46 is OFF). When the switch knob 60 is moved forward, the slide plate 57 is also moved forward to rotate the change lever 91 to the right in FIG. 12 via the upper arm portion 92. Therefore, as shown in FIGS. 92 slides the push button 94 backward to press the button 47 and turn on the switch 46.

As described above, the push button 94 that is engaged with the arm portion 92 and moves back and forth integrally is disposed between the arm portion 92 of the change lever 91 and the button 47, and the arm portion 92 is rotated along with the rotation of the change lever 91. If the button 47 is pressed via the push button 94, the button 47 can be pushed along the axial direction of the main body housing 2 by the push button 94 even if the rotating change lever 91 is provided.
However, such a pressing mechanism is eliminated, and the rear end of the slide member such as a slide plate is formed in an inverted L shape. It is possible to turn on.

In addition, the invention relating to cooling of the controller and the terminal block is not limited to the grinder, and can be applied to other electric tools as long as the battery is used as a power source and the controller is provided. is there.
On the other hand, the invention relating to the direction of the switch is not limited to a grinder, and may be an AC tool that does not use a battery as a power source as long as it has a switch that can be turned ON / OFF by a sliding operation of an operation member. The present invention can also be applied to other power tools such as joint cutters, nibbles, and straight shears.

  1, 1A ... Rechargeable grinder 2. Main body housing 3. Gear housing 4. Battery mounting part 5. Battery pack 6. Brushless motor 7. Spindle 9. Cylindrical part 10..Square tube portion, 11..Stator, 12..Rotor, 21..Signal line, 24, 89..Power line, 26..Rotating shaft, 30..Centrifuge fan, 39..Exhaust port, 46, Switch, 47, Button, 49, 81, Space, 51, 91, Change lever, 53, Pin, 54, Cam part, 55, 92, Arm part, 57, Slide plate, 60..Switch knob, 69..Terminal block, 74..Controller, 75..Circuit board, 77..LED, 78..Case, 83..Window, 86..Display, 87..Air intake, 88 ... Guide wall, 90 ... Lead wire 94 ... push button.

Claims (4)

A power tool that houses a motor and a push button type switch in a cylindrical housing, and is provided with an operation member for turning the switch ON / OFF by sliding operation in the front-rear direction outside the housing. There,
An electric tool characterized in that the switch is accommodated in a forward-facing posture with a button on the front side.   A slide member that slides in the front-rear direction in conjunction with the operation member is provided in the housing, and the button of the switch is pressed between the slide member and the switch as the slide member advances. The power tool according to claim 1, further comprising a pressing mechanism that moves away from the button in accordance with the retraction of the slide member.   The pressing mechanism is rotatably supported in the housing, one end is locked to the slide member, the other end is positioned in front of the button, and rotates according to the advance of the slide member. The power tool according to claim 2, wherein the other end includes a lever member that presses the button.   Between the other end of the lever member and the button, a button member that is locked to the other end and moves integrally back and forth is disposed, and the other end moves the button member with the rotation of the lever member. The power tool according to claim 3, wherein the button is pressed through the power tool.

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