CN210173433U - Screw fastening tool - Google Patents

Abstract

The utility model relates to a screw fastening instrument, it can be easily and reliably carry out visual confirmation to the luminous part for the notice. A charging type right-angle screw driver (1) comprises: a brushless motor (4); a clutch (6) which is disposed in front of the brushless motor (4) and which connects and disconnects rotation from the brushless motor (4); and an output shaft (12) which is disposed in front of the clutch (6) and which transmits rotation from the clutch (6) so that screw tightening can be achieved by the output shaft (12), wherein a notification light emitting unit (75) which notifies of the screw tightening is disposed in front of the brushless motor (4).

Description

Screw fastening tool

Technical Field

The utility model relates to a screw fastening instrument such as right angle screw driver.

Background

In a screw tightening tool such as a right-angle screw driver, a notification light emitting unit for notifying an operator of information relating to screw tightening, such as completion of tightening and attachment of a bolt or the like with a predetermined torque or occurrence of an error, may be provided. For example, patent document 1 discloses an invention in which a motor is housed and includes a main body portion extending in a front-rear direction, and a handle portion connected to the main body portion and extending downward, and a notification light emitting portion (LED) is provided at least up to a side surface from a rear surface of the main body portion.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-94651

SUMMERY OF THE UTILITY MODEL

In the screw fastening tool of patent document 1, the LED as the notification light emitting unit is provided up to the side surface of the main body, and therefore, the visual confirmation is higher than that in the case where the LED is only on the rear surface. However, in general, in the screw fastening work, the worker's attention is focused on the screw fastening portion at the front end of the main body, and therefore, even on the side surface of the main body, there is a possibility that the LED located on the rear side is overlooked or the LED does not enter the visual field.

Therefore, the present invention provides a screw fastening tool capable of visually confirming the notification light emitting portion easily and reliably.

In order to achieve the above object, the utility model described in claim 1 relates to a screw fastening tool, which includes: a motor; a clutch disposed in front of the motor and configured to connect and disconnect rotation from the motor; and an output shaft that is disposed in front of the clutch, transmits rotation from the clutch, and enables screw tightening through the output shaft, wherein a notification light-emitting unit that notifies of the screw tightening is disposed in front of the motor.

A utility model relating toclaim 2 is characterized in that, in addition to the configuration described in claim 1, the notification light emitting unit is disposed further forward than the clutch.

A feature of the invention according toclaim 3 is that, in addition to the configuration described inclaim 1 or 2, the motor is disposed such that the rotation axis faces forward, and the output shaft is disposed orthogonal to the rotation axis.

A feature of the invention according toclaim 4 is that, in addition to the configuration described inclaim 1 or 2, the motor is disposed such that the rotation axis faces forward, and the output shaft is disposed coaxially with or parallel to the rotation axis.

A feature of a utility model relating toclaim 5 is that, in addition to the configuration described in any one of claims 1 to 4, the screw tightening tool has a tubular front side housing that holds the clutch and/or the output shaft and extends forward, and the notification light emitting portion is disposed on an outer surface of the front side housing in a rotation stop state.

A utility model according toclaim 6 is characterized in that, in addition to the configuration described inclaim 5, the notification light emitting unit includes: a circuit board disposed in a posture orthogonal to the front case; a plurality of LEDs arranged on the front surface of the circuit board; and a lens disposed in front of the LED.

A utility model according to claim 7 is characterized in that, in addition to the configuration described inclaim 6, the circuit board is in a U-shape when viewed from the front.

A feature of the invention according toclaim 8 is that, in addition to the configuration described in claim 7, the circuit board is inserted and fitted into the outer surface of the front case from the outside in the radial direction of the front case.

A feature of the invention according toclaim 9 is that, in addition to the configuration described in any one ofclaims 6 to 8, the LEDs are arranged at least within 240 ° in the circumferential direction of the front side case.

A feature of the utility model according toclaim 10 is that, in addition to the configuration described inclaim 9, the circuit board is provided so as to surround the entire circumference of the shaft of the front side case.

In order to achieve the above object, the invention described inclaim 11 relates to a screw fastening tool including: a motor; a clutch disposed in front of the motor and configured to connect and disconnect rotation from the motor; and an output shaft disposed in front of the clutch, transmitting rotation from the clutch, and enabling screw tightening through the output shaft, wherein a light emitting portion for notification of the screw tightening is provided forward.

According to the present invention, since the notification light-emitting portion is close to the screw-fastening portion, the notification light-emitting portion can be easily viewed even if the attention of the operator is focused on the screw-fastening portion.

Drawings

Fig. 1 is a side view of a charging type right-angle screw driver.

Fig. 2 is a bottom view of the rechargeable right-angle screw driver.

Fig. 3 is a front enlarged view of the charging type right-angle screw driver.

Fig. 4 is a central longitudinal sectional view of the charging type right-angle screw driver.

Fig. 5 is an enlarged view of the front portion of fig. 4.

Fig. 6 is a perspective view illustrating the front case and the notification light emitting portion in an exploded manner.

Fig. 7(a), 7(B), and 7(C) are explanatory views of the circuit board, with fig. 7(a) showing a front view, 7(B) showing a rear view, and 7(C) showing a perspective view from the rear surface.

Fig. 8 is an enlarged cross-sectional view of the circuit board at the position of the inclined surface portion of the tab showing the insertion and fitting state.

Fig. 9 is a schematic view of a charging type screw driver according to a modification.

Description of the reference numerals

A rechargeable right-angle screw driver, a 1a.. rechargeable screw driver, a 2.. main body, a 3.. motor housing, a 4.. brushless motor, a 5.. clutch housing, a 6.. clutch, a 7.. handle housing, a 8.. battery mounting portion, a 10.. front side housing, a 11.. output portion, a 12.. output shaft, a 13.. battery pack, a 15.. controller, a 16.. control circuit board, a 26.. rotation shaft, a 45.. rear cam, a 47.. front cam, a 48.. spindle, a 52.. coil spring, a 62.. sensor board, a 65.. magnet, a 66.. detection board, a 67.. hall IC, a 68.. window, a 69.. lighting board, a 70.. lighting board, a 75. notification circuit board, a 75.. light-emitting portion, a light-emitting portion, and a light-emitting portion, 77..

Detailed Description

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

Fig. 1 is a side view, fig. 2 is a bottom view, fig. 3 is a front view, and fig. 4 is a central longitudinal sectional view of a rechargeable right-angle screw driver (hereinafter simply referred to as "screw driver") 1 as an example of a screw fastening tool.

Themain body 2 of the screw driver 1 is formed into a cylindrical body extending linearly in the front-rear direction, and includes: amotor housing 3 that houses thebrushless motor 4 at the center in the front-rear direction; aclutch housing 5 connected to the front side of themotor housing 3, accommodating theclutch 6, and extending forward; a handle case 7 connected to the rear side of themotor case 3 and extending rearward; and abattery mounting portion 8 coupled to the rear side of the handle case 7. Themain body 2 is formed by assembling left andright split cases 2a, 2b withscrews 9, 9.

Afront case 10, which is housed in theoutput portion 11 and extends forward in a side view in an inverted L shape, is coupled to the front end of themain body portion 2, and anoutput shaft 12 is projected downward.

On the other hand, abattery pack 13 as a power source is slidably attached to thebattery mounting portion 8 from below, and aterminal block 14 electrically connected to thebattery pack 13 attached is provided in thebattery mounting portion 8. On the front side of theterminal block 14, acontroller 15 in which acontrol circuit board 16 on which a capacitor, a microcomputer, a switching element, and the like are mounted is housed in acase 17 is provided in parallel with theterminal block 14.

Further, atrigger switch 18 for projecting atrigger 19 downward is housed in a front portion of the handle case 7 in front of theterminal block 14. A forward/reverse switching button 20 of thebrushless motor 4 is provided in front of thetrigger switch 18.

Thebrushless motor 4 is an inner rotor type having astator 21 and arotor 22, and thestator 21 has: astator core 23;insulators 24 and 24 provided in front and rear of thestator core 23; and a plurality ofcoils 25, 25 wound around thestator core 23 viainsulators 24, 24. Further, therotor 22 includes: a rotatingshaft 26 located at the axial center; a cylindrical rotor core 27 disposed around the rotatingshaft 26;permanent magnets 28, 28 disposed outside the rotor core 27 in a cylindrical shape such that polarities alternately change in the circumferential direction; and a plurality of permanent magnets 29, 29 for sensors, which are arranged in a radial shape on the front side of thepermanent magnets 28, 28. A sensor circuit board 30 is screwed to the front end of thefront insulator 24 from the front, and a rotation detection element, not shown, that detects the position of the sensor permanent magnet 29 and outputs a rotation detection signal is mounted on the sensor circuit board 30. Thesignal line 31 of the rotation detection element is led out rearward from the lower side of the sensor circuit board 30 and wired to thecontrol circuit board 16. The magnet wires of the respective phases forming the three-phase coil 25 are electrically connected to the terminal unit 32 screwed to the lower side of thefront insulator 24 via the fuse terminal, and the power supply line led out rearward from the terminal unit 32 behind thesignal line 31 is wired to thecontrol circuit board 16.

Inside themain body portion 2, afront wall 33 that partitions between themotor housing 3 and theclutch housing 5 and arear rib 34 that partitions between themotor housing 3 and the handle housing 7 are provided. Therotary shaft 26 is rotatably supported in the front-rear direction by a bearing 36 held by acylindrical bearing holder 35 received by thefront wall 33 and abearing 37 held at the center of therear rib 34. Acentrifugal fan 38 for cooling the motor is fixed to the front of thebearing 37 of therotary shaft 26, a plurality ofair inlets 39, 39 are formed at a radially outer portion of thestator 21 of themotor housing 3, and a plurality ofair outlets 40, 40 are formed at a radially outer portion of thecentrifugal fan 38.

Therotary shaft 26 has abearing holder 35 inserted therein and projecting forward, and apinion gear 41 fixed to a front end thereof. A speed reduction mechanism including front and rear two-stage carriers 43 and 43 supporting a plurality ofplanetary gears 44 and 44 in aninternal gear 42 is disposed in front of thebearing holder 35, and thepinion gear 41 meshes with theplanetary gears 44 and 44 of therear carrier 43.

Theclutch 6 includes arear cam 45 that rotates integrally with thefront carrier 43, and afront cam 47 that engages with therear cam 45 in the rotational direction via acam ball 46. Amain shaft 48 penetrates the center of theclutch 6, and themain shaft 48 is coupled to thefront cam 47 in the rotational direction via aball 50 provided in acam groove 49. Acoil spring 52 is provided between aspring seat 51 through which themain shaft 48 passes and thefront cam 47 in front of thefront cam 47, and biases thefront cam 47, which is movable forward and backward with respect to themain shaft 48 via aball 50, to a retracted position where the front cam is engaged with thecam ball 46. Themain shaft 48 is provided at the rear end of thefront housing 10 and coaxially protrudes inside a small-diametercylindrical joint 53 held at the front end of theclutch housing 5. Ascrew portion 54 protruding forward of theclutch housing 5 is formed in a front portion of thejoint 53.

Thefront housing 10 has ajoint 53 and an inverted L-shaped elbow 55 provided in front of thejoint 53, and thefront housing 10 and theclutch housing 5 are coupled by screwing a threadedsleeve 56 fitted around the rear end of theelbow 55 into the outer periphery of the threadedportion 54 of thejoint 53.

In thefront side housing 10, anintermediate shaft 57 having abevel gear 58 at its front end is held by a plurality ofbearings 59 and 59 at the rear end of theintermediate joint 53 and theelbow 55, and the hexagonal rear end (fig. 6) of theintermediate shaft 57 projecting rearward is fitted into a hexagonal hole formed at the front end of themain shaft 48 and is integrally coupled in the rotational direction.

Further, at the downward tip end portion of theelbow 55, theoutput shaft 12 is held by upper andlower bearings 60, 60 and projects downward, and abevel gear 61 provided on theoutput shaft 12 is engaged with abevel gear 58 of theintermediate shaft 57.

Therefore, in theclutch 6, if therear cam 45 rotates together with thefront carrier 43 that rotates from therotary shaft 26 through two-stage speed reduction, thefront cam 47 rotates via thecam ball 46, and themain shaft 48 rotates via the ball 50 (rotational connection by the clutch 6). Then, theintermediate shaft 57 integral with themain shaft 48 rotates, and theoutput shaft 12 rotates via the bevel gears 58 and 61.

On the other hand, if the load torque transmitted from theoutput shaft 12 to themain shaft 48 via theintermediate shaft 57 exceeds the pressing force (set torque) of thefront cam 47 determined by thecoil spring 52, thefront cam 47 advances via theballs 50 rolling in thecam groove 49, and the engagement with thecam ball 46 is released and therear cam 45 idles (the rotation by theclutch 6 is disconnected).

As shown in fig. 5, thesensor plate 62 is provided below the clutch 6 so as to be movable forward and backward and biased to the retreated position by acoil spring 63, and an engagingpiece 64 projecting toward thespindle 48 side is positioned in front of thefront cam 47. Therefore, when theclutch 6 is rotated and disengaged, thefront cam 47 advances and comes into contact with theengagement piece 64, and thesensor plate 62 advances integrally with thefront cam 47. Amagnet 65 is provided at the rear of thesensor plate 62, and adetection substrate 66 having ahall IC 67 on the lower surface thereof is provided in the front-rear direction, and is connected to thecontrol circuit board 16 via a lead wire, not shown, below the magnet. That is, when theclutch 6 is operated and thesensor plate 62 moves forward, thehall IC 67 detects a change in the magnetic field of themagnet 65 moving forward, and thedetection substrate 66 transmits a detection signal thereof to thecontrol circuit substrate 16.

Further, arectangular window 68, which is long in the front-rear direction, is formed on the lower surface of theclutch housing 5 in front of thesensor plate 62, and anillumination substrate 69, on which 2illumination lamps 70, 70 composed of LEDs are arranged in the front-rear direction, is provided in thewindow 68 in an inclined posture toward the oblique front. Acover 71 for covering thelighting board 69 from below is provided on the lower side of thelighting board 69, and thecover 71 is fitted to thewindow 68 from the inside to expose the lower surface parallel to thelighting board 69. Therefore, the vicinity of theoutput shaft 12 can be reliably illuminated.

In addition, a notificationlight emitting unit 75 for notifying whether or not the screw tightening is acceptable is provided at the front end of theclutch housing 5 in front of theclutch 6. As shown in fig. 5 and 6, the notificationlight emitting unit 75 is composed of acircuit board 76 on which 3notification lamps 77 and 77 are mounted along the front surface, and alens 78 which is assembled in front of thecircuit board 76. As shown in fig. 7(a), 7(B), and 7(C), thecircuit board 76 is formed into a U shape in front view by aradial slit 79 passing through the center, and thelamps 77 are arranged one by one at intervals of 120 ° in the circumferential direction at both sides of theslit 79 and at the center portion on the tip side of theslit 79, and are arranged at the apexes of a regular triangle. In eachlamp 77, 2 LEDs of green and red are provided. Aconnection portion 80 of a lead is provided on the rear surface of thecircuit board 76.

On the other hand, a pair ofinclined surface portions 81, 81 matching the width of thenotch 79 of thecircuit board 76 are formed in a rear portion of thescrew portion 54 of the joint 53 in a direction inclined by 45 ° with respect to the vertical direction in front view. Therefore, thecircuit board 76 can be inserted and fitted into the rear portion of the threadedportion 54 obliquely from below or obliquely from above along theinclined surfaces 81 and 81. Aridge 82 having the same outer diameter as thecircuit board 76 protrudes concentrically from the outer side of the threadedportion 54 on the front end surface of theclutch housing 5.

Thelens 78 is formed of a light-transmitting white resin, has an annular outer diameter substantially equal to the diameter of the front end of theclutch housing 5, and has an outer peripheral rear end fitted over theconvex strip 82 of theclutch housing 5 to accommodate thecircuit board 76 on the rear surface. A taperedsurface 83 whose tip is tapered toward the front is formed on the side surface of thelens 78 over the entire circumference, and an annularconcave groove 84 into which thelamps 77 and 77 of thecircuit board 76 are fitted is formed on the rear surface.

On the other hand, an O-ring 85 is externally attached between thescrew portion 54 of the joint 53 and theinclined surface portions 81 and 81, and in a state where thelens 78 is externally fitted to the front end surface of theclutch housing 5, the O-ring 85 abuts against the inner peripheral side of the front surface of thelens 78 to prevent thelens 78 from coming off.

Therefore, when the notificationlight emitting portion 75 is assembled to the front end surface of theclutch housing 5, thecircuit board 76 is inserted and fitted into theinclined surface portions 81 and 81 from diagonally left and downward in the direction of thenotch 79 and positioned at the front end of theconvex strip 82 before theelbow 55 is connected to the joint 53, as shown in fig. 8. Thus, thelamps 77 are uniformly arranged on the circumference centering on the axis of themain shaft 48 and positioned at the vertices of the regular triangle.

Next, the notificationlight emitting unit 75 can be assembled by covering thelens 78 from the front of thecircuit board 76 and fitting it into theconvex strip 82, and fitting the O-ring 85 around thescrew portion 54. Here, the rear end portion of theelbow 55 is assembled to the joint 53 with the phase in the rotational direction being aligned by the positioning pins 86, 86 provided on the front surface of the joint 53, and if the threadedsleeve 56 is screwed into the threadedportion 54, theelbow 55 and the joint 53 are coupled. At this time, the rear end of the threadedsleeve 56 approaches the inner periphery of thelens 78 of thelight emitting section 75 for notification, and thelens 78 is also prevented from coming off here. The lead wires connected to theconnection portion 80 of thecircuit board 76 and the lead wires connected to thedetection board 66 and theillumination board 69 are led through the wiring space 87 (fig. 4 and 5) formed below thesensor board 62 and thedetection board 66 and led rearward along the lower inner surface of theclutch housing 5, and are led through the inside of the handle housing 7 and electrically connected to thecontrol circuit board 16.

In the screw driver 1 configured as described above, if the driver head attached to theoutput shaft 12 is pressed against the screw to be fastened, and thetrigger 19 is pushed in this state to turn on thetrigger switch 18, power is supplied from thebattery pack 13 to drive thebrushless motor 4. That is, the microcomputer of thecontrol circuit board 16 acquires the rotation detection signal indicating the position of the sensor permanent magnet 29 of therotor 22 output from the rotation detection element of the sensor circuit board 30 to acquire the rotation state of therotor 22, controls ON/OFF of each switching element according to the acquired rotation state, and sequentially causes current to flow through eachcoil 25 of thestator 21 to rotate therotor 22. However, the operation amount (pressing amount) of thetrigger 19 is transmitted to the microcomputer as a signal, and the rotation of therotor 22 is controlled in accordance with the operation amount.

When therotor 22 rotates in this manner, therotation shaft 26 rotates to rotate theplanetary carriers 43 and 43 at a reduced speed via theplanetary gear 44, and themain shaft 48, theintermediate shaft 57, and theoutput shaft 12 are rotated via theclutch 6. Thus, the screw fastening can be achieved by the driver bit. If the screw tightening progresses to reach the set torque determined by thecoil spring 52, thefront cam 47 advances, and the transmission of rotation from therear cam 45 is disconnected in the clutch 6 as described above, and the rotation of theoutput shaft 12 stops.

At this time, when thedetection board 66 detects the advance of thesensor plate 62 based on the operation of the clutch 6 while the microcomputer of thecontrol circuit board 16 is pressing thetrigger 19, it is determined that the screw fastening is "acceptable", and thelight emitting unit 75 for notification causes thelights 77 of thecircuit board 76 to emit light of green color. On the other hand, when thedetection substrate 66 does not detect the advance of the sensor plate 62 (for example, when the pushing operation of thetrigger 19 is stopped before the advance of thesensor plate 62 is detected), it is determined that the screw fastening is "failed", and thelamps 77 of thecircuit substrate 76 are caused to emit red light.

In this way, in the notificationlight emitting portion 75, theentire lens 78 emits green or red light by the light emission of the 3lamps 77 and 77 that are immediately behind thebend 55, and thus the light appears over the entire circumference of the front end surface and the front end of theclutch housing 5. Therefore, the operator can naturally visually confirm the light emission from thelens 78 from all directions at the position close to the screw fastening portion without moving the line of sight regardless of the orientation of the screw driver 1, and can easily confirm the determination result.

On the other hand, the notification light-emittingunit 75 is used for notification of a decrease in the remaining capacity of the battery pack 13 (flashing red or the like), notification of an abnormal decrease in the voltage supplied to the controller 15 (alternately lighting red and green or the like), notification of an abnormal temperature of the controller 15 (flashing red or the like), and the like, in addition to notification of whether or not the screw fastening is acceptable.

Further, if thecentrifugal fan 38 rotates together with therotary shaft 26, the air sucked through theair inlet 39 cools thebrushless motor 4 and is discharged through theair outlet 40.

Further, thetrigger switch 18 is turned on and thelighting lamps 70 and 70 of thelighting substrate 69 are turned on by thecontrol circuit board 16. Therefore, the front of the screwdriver bit is irradiated through thecover 71, and the workability can be maintained even in a dark place.

As described above, according to the screw driver 1 of the above-described aspect, since the notificationlight emitting unit 75 that notifies about screw fastening is disposed in front of thebrushless motor 4, the notificationlight emitting unit 75 is located closer to the screw fastening portion, and even if the attention of the operator is focused on the screw fastening portion, the operator can easily enter the field of view, and can easily and reliably visually confirm the notificationlight emitting unit 75.

In particular, since the notificationlight emitting unit 75 is disposed forward of the clutch 6, the notificationlight emitting unit 75 is further disposed toward the screw fastening portion, and the visual confirmation is further improved.

Further, since thefront side case 10 having a cylindrical shape that holds theoutput shaft 12 and extends forward is provided and the notificationlight emitting unit 75 is disposed on the outer surface of thefront side case 10 in a rotation stop state, the notificationlight emitting unit 75 can be assembled at an appropriate position in the circumferential direction of thefront side case 10.

The notificationlight emitting unit 75 is configured to include: acircuit board 76 disposed in a posture orthogonal to thefront case 10; a plurality of LEDs (lamps 77) disposed on the front surface of thecircuit board 76; and alens 78 disposed in front of thelamp 77, so that the notificationlight emitting unit 75 suitable for emitting light to the front and the outer periphery can be obtained.

Since thecircuit board 76 has a U-shape when viewed from the front, thefront case 10 can be easily assembled.

Further, since thecircuit board 76 is inserted and fitted into the outer surface of thefront case 10 from the outside in the radial direction of thefront case 10, erroneous assembly of thecircuit board 76 does not occur.

Further, since thelamps 77 are arranged within 240 ° in the circumferential direction of thefront side case 10, an effective light emission state is achieved.

In particular, in the screw driver 1 of the above-described aspect, the notificationlight emitting unit 75 is disposed forward, and therefore the visual confirmation is improved.

On the other hand, the screw driver 1 according to the above aspect includes: a motor (brushless motor 4) having a rotatingshaft 26; a clutch 6 disposed in front of thebrushless motor 4, for connecting and disconnecting rotation from thebrushless motor 4; anoutput shaft 12 disposed in front of the clutch 6 so as to be orthogonal to therotation shaft 26 and transmitting rotation from theclutch 6; amotor case 3 that houses thebrushless motor 4; a handle case 7 disposed behind themotor case 3 and extending in the front-rear direction; and abattery mounting portion 8 which is disposed behind the handle case 7 and which can be screwed by theoutput shaft 12, and a notificationlight emitting portion 75 which gives notification about screwing is disposed in front of thebrushless motor 4, and therefore the notificationlight emitting portion 75 is disposed close to the screw fastening portion, and visual confirmation can be easily and reliably performed.

The front side case of the above-described aspect holds the output shaft and the intermediate shaft, but may extend rearward to further hold the clutch. On the contrary, the arrangement of the light emitting unit for notification can be realized even if only the clutch is held without holding the output shaft.

In addition, the notification light emitting unit may be configured such that the circuit board is inserted and fitted from obliquely upper left side, or may be configured such that the circuit board is not limited to a U shape in front view, but may be semicircular or arc-shaped in front view depending on the number of lamps. As long as the front side case can be externally fitted, a ring shape around the entire circumference of the shaft of the front side case, including the circuit board and the lens, may be used. However, the outer shape of the notification light emitting unit is not limited to a ring shape, and may be a square or polygonal shape as long as it is in front of the motor. The number and the interval in the circumferential direction of the lamps are not limited to the above-described embodiments, and the lamps may be arranged in a range exceeding 240 ° in the circumferential direction by appropriately increasing or decreasing.

On the other hand, the notification light emitting unit is not limited to the configuration including the circuit board and the Lamp (LED), and for example, a strip-shaped LED in which LEDs are mounted on a flexible strip-shaped resin substrate at a constant interval may be used, and the strip-shaped LED may be wound around the outer periphery of the front side case, or a strip-shaped LED of a different color may be cut at an appropriate length and disposed on the outer surface of the front side case.

Further, the notification light-emitting portion may be formed by winding an EL fiber, which is obtained by forming the inorganic EL light-emitting material into a cylindrical shape, into a ring shape in a groove provided on the outer periphery of the front case. In this case, in order to realize multicolor, it is necessary to wind a plurality of EL fibers having different colors.

The notification light emitting unit of the present invention including the above-described embodiments and modifications is not limited to being disposed in front of the clutch, and may be disposed between the motor and the clutch.

In addition, the present invention is not limited to a right-angle screw driver, and can be applied to other screw fastening tools such as a screw driver in which an output shaft is not output in a shape orthogonal to a main shaft. Therefore, the main body portion is not limited to a straight line, and the present invention can be applied to a so-called T-shaped (gun-shaped) screw fastening tool in which the handle case 7 and themotor case 3 are coupled to each other in an orthogonal manner, as in the rechargeable screw driver 1A schematically shown in fig. 9. Here, themain shaft 48 protrudes forward from theclutch housing 5 coaxially with therotary shaft 26 as an output shaft, and a notificationlight emitting unit 75 is provided at the front end of theclutch housing 5. However, themain shaft 48 may be not coaxial but parallel to therotation shaft 26.

The present invention is not limited to DC tools using a battery pack as a power source, and can be applied to AC tools using a commercial power source. The motor may be other than a brushless motor, such as a commutator motor.

Further, the effect of improving the visual confirmation obtained by disposing the notification light emitting portion in the vicinity of the working portion such as the screw fastening portion can be obtained also in other electric tools such as a hammer drill in addition to the screw fastening tool, and therefore, a configuration can be obtained in which the notification light emitting portion is disposed at the front end of the main body portion and the front side housing of the electric tool.

Claims (11)

1. A screw fastening tool having:

a motor;

a clutch disposed in front of the motor and configured to connect and disconnect rotation from the motor; and

an output shaft disposed in front of the clutch and transmitting rotation from the clutch,

screw fastening can be achieved by means of the output shaft,

the method is characterized in that:

the notification light emitting unit that notifies of the screw tightening is disposed forward of the motor.

2. The screw tightening tool according to claim 1,

the notification light emitting unit is disposed forward of the clutch.

3. The screw tightening tool according to claim 1 or 2,

the motor is disposed such that a rotation axis faces forward, and the output shaft is disposed orthogonal to the rotation axis.

4. The screw tightening tool according to claim 1 or 2,

the motor is arranged such that a rotation shaft faces forward, and the output shaft is arranged coaxially with or parallel to the rotation shaft.

5. The screw tightening tool according to claim 1 or 2,

the screw tightening tool includes a cylindrical front case that holds the clutch and/or the output shaft and extends forward, and the notification light emitting unit is disposed on an outer surface of the front case in a rotation stop state.

6. The screw tightening tool according to claim 5,

the notification light emitting unit includes: a circuit board disposed in a posture orthogonal to the front side case; a plurality of LEDs arranged on the front surface of the circuit board; and a lens disposed in front of the LED.

7. The screw tightening tool according to claim 6,

the circuit substrate is in a U shape when being observed from the front side.

8. The screw tightening tool according to claim 7,

the circuit board is inserted and fitted into an outer surface of the front case from a radially outer side of the front case.

9. The screw tightening tool according to claim 6,

the LEDs are arranged at least in the range of 240 degrees in the circumferential direction of the front side shell.

10. The screw tightening tool according to claim 9,

the circuit substrate is disposed around the entire circumference of the shaft of the front side case.

11. A screw fastening tool having:

a motor;

a clutch disposed in front of the motor and configured to connect and disconnect rotation from the motor; and

an output shaft disposed in front of the clutch and transmitting rotation from the clutch,

screw fastening can be achieved by means of the output shaft,

it is characterized in that the preparation method is characterized in that,

the notification light emitting unit for performing notification related to the screw tightening is provided facing forward.

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