CN101631647B - Electrical power tool - Google Patents

Abstract

The invention discloses an electric tool (1), which comprises: a casing (2), a motor (3), an end bit holding part (12a), a transmission mechanism, a cover and an illuminating part (36, 37). The housing has one end. The motor is housed in the housing and configured to generate rotational driving force. The end bit holder is provided at one end and is rotatable about the rotation axis. The transmission mechanism transmits the rotational driving force to the end bit holding portion. A shroud is attached to one end. The lighting section allows the entire enclosure to be illuminated.

Description

electrical tools

technical field

The present invention relates to a power tool, and more particularly, the present invention relates to a power tool having a light for illuminating a work area.

Background technique

Hand-held power tools such as power drills are conventionally known. Such a power tool includes a housing housing an electric motor that generates rotational driving force. A rotational driving force is transmitted to an end-bit holding section to rotate the end-bit holding section and install an end-bit such as a driving bit on the end-bit holding section, thereby performing a desired work such as screw driving.

When such a power tool is used to perform desired work in dark places such as attics and basements where natural light cannot reach, it is difficult to accurately perform desired work such as screw driving due to the darkness.

Japanese Patent Application Laid-Open No. 2003-211374 discloses a power tool that includes a light attached to the housing of the power tool such that the light illuminates the work area in a directional manner, i.e., the end bits and screws or Similar parts are illuminated.

Japanese Patent Application Laid-Open No. 2003-301669 discloses an electric power tool including an LED lamp provided to a front lower surface of a main housing. A part of the light emitted from the LED lamp is transmitted to the display window provided to the front upper surface of the main housing through the optical fiber, thereby illuminating the display window.

Contents of the invention

However, the conventional power tool disclosed in Japanese Patent Application Laid-Open No. 2003-211374 illuminates the work area only with directional lighting. As a result, power tools are unable to illuminate a wide area of work and often create shadows that may prevent effective work.

Another conventional power tool disclosed in Japanese Patent Application Laid-Open No. 2003-301669 is configured to transmit a part of light emitted from an LED lamp. Therefore, insufficient illumination may be provided to the display window. In addition, it is not easy to arrange the optical fiber in the main housing.

In consideration of the above circumstances, an object of the present invention is to provide an electric power tool capable of illuminating a work area including a wide range and capable of preventing shadows from being generated, thereby improving usability in dark places.

This and other objects of the present invention will be achieved by a power tool comprising a housing, a motor, an end bit holder, a transmission mechanism, a cover and a light. The housing has one end. The motor is housed in the housing and configured to generate rotational driving force. The end bit holder is provided at one end and is rotatable about the rotation axis. The transmission mechanism transmits the rotational driving force to the end bit holder. A shroud is attached to one end. The lighting section allows the entire enclosure to be illuminated. With this arrangement, a wide area of the work area can be illuminated without shadows since the entire enclosure is illuminated. Therefore, usability in dark places is improved.

Preferably, the lighting part includes a light source and a light scattering part. The light source emits light. The light scattering part is configured to scatter light emitted from the light source in different directions, thereby allowing the entire cover to be illuminated. With this arrangement, the entire cover can be illuminated with a simple structure.

Preferably, the cover has a hollow cylindrical shape and is constructed of transparent or translucent resin, and the light source and the light scattering part are provided inside the cover. With this arrangement, the light source and the light scattering portion are not exposed to the outside of the cover. Therefore, the light source and the light scattering part neither affect the appearance of the electric tool nor hinder the work of the user.

Preferably, the light scattering part includes a prism having a hollow cylindrical shape. With this arrangement, since the prisms scatter the light emitted from the light source in different directions, the entire cover can be uniformly illuminated.

Preferably, the cover has an inner circumferential surface formed with concave portions and convex portions. With this arrangement, since the light emitted from the light source is scattered by the concave and convex portions formed on the inner peripheral surface, the entire cover can be uniformly illuminated.

Preferably, the light source comprises a light emitting diode. With this arrangement, since light-emitting diodes emitting high-brightness light with small power consumption are used as light sources, necessary and sufficient brightness can be obtained, and power consumption can be saved to prolong battery life.

Preferably, the power tool further includes a torque adjustment mechanism housed in the housing and configured to adjust a maximum torque transmitted to the end bit holder. The cover is rotatable about the axis of rotation and serves as a torque adjustment dial for adjusting the maximum torque. The torque adjustment dial is constructed of clear or translucent resin. With this arrangement, the entire torque adjustment dial is illuminated. Therefore, the torque adjustment dial can be seen in dark places. Therefore, torque adjustment can be easily and accurately realized with a simple structure in a dark place.

Preferably, the torque adjustment dial is in the shape of a hollow cylinder having an outer peripheral surface, and numbers representing torque setting values are displayed on the outer peripheral surface. With this arrangement, the user can clearly see the torque setting value displayed on the outer peripheral surface of the torque adjustment dial even in a dark place. Therefore, torque adjustment can be achieved more easily and accurately in dark places.

Preferably, the outer circumferential surface includes a display portion and a transparent portion. Numerals are displayed on the display unit. The display portion is opaque. The transparent part can transmit light. With this arrangement, since the numbers indicating the torque setting value are displayed on the opaque display part, and sufficient brightness is provided through the transparent part, the numbers can be clearly seen even in a dark place, so torque adjustment can be easily and accurately achieved .

Preferably, the light source comprises a light emitting diode. With this arrangement, since a light emitting diode emitting high-brightness light with small power consumption is used as a light source, necessary and sufficient brightness can be obtained, and the torque adjustment dial can be clearly seen with low power consumption.

Description of drawings

1 is a sectional view showing a driving drill according to a first embodiment of the present invention, wherein a pressing member is positioned on the front side so that the maximum torque is set to a lower value;

2 is a sectional view showing the driving drill according to the first embodiment, wherein the pressing member is positioned on the rear side so that the maximum torque is set to a higher value;

3 is a front view with a partial cross section showing the driving drill according to the first embodiment;

4 is an enlarged partial sectional view of the driving drill according to the first embodiment, for specifically showing the driving force transmission mechanism;

5 is a front view showing a prism of the driving drill according to the first embodiment;

Fig. 6 is a cross-sectional view taken along line VI-VI among Fig. 5;

7 is a partial sectional view showing a driving drill according to a second embodiment of the present invention; and

FIG. 8 is a developed view showing a torque adjustment dial of the driving drill according to the second embodiment.

Explanation of reference signs

1,101 Drive drilling rig (power tool)

2,102 Shell

2A, 102A The main part of the housing

2B, 102B The handle part of the shell

3,103 electric motor

3a, 103a The output shaft of the electric motor

4 battery

5,105 switch

6 control panel

7, 9, 38, 138 wires

8 Indicator lights

10 Lithium-ion battery

11, 111 Planetary gear mechanism

12, 112 output shaft

12a, 112a The end bit holder of the output shaft

13, 113 Torque adjustment mechanism

14 Hood

14i inner peripheral surface of cover

15,115 Gearbox

15a, 115a Cylindrical part of gearbox

16 pinion gear

17, 22, 27 ring gear

18, 23, 28 planetary gears

19, 24, 29 axis

20, 25 bracket

21, 26 Central gear

27a Engagement claw for ring gear

30, 130 extrusion parts

31 Bearing

32,132 Ball

33 spacer

34 clutch plate

35, 135 coil spring

36, 136 LED (light source)

37 Prism

114 Torque adjustment dial

114a Display part

114b Transparent part

140 driving bit

Detailed ways

An electric power tool according to a first embodiment of the present invention will be described with reference to FIGS. 1-6. The electric tool of the first embodiment is applied to a driving drill 1 . In FIGS. 1 and 2 , the left side is referred to as the front side of the drive drill 1 , and the right side is referred to as the rear side of the drive drill 1 .

The driver drill 1 of the first embodiment includes a housing 2 which is formed of resin and has a substantially T-shape in side view. The housing 2 includes a main body portion 2A extending in the front-rear direction and a handle portion 2B extending downward from the main body portion 2A and formed as an integral part with the main body portion 2A. A lower portion of the handle portion 2B is formed with a space for accommodating a control panel 6 to be described later.

A motor 3 that generates driving force and has an output shaft 3 a is accommodated in the main body portion 2A such that the output shaft 3 a extends in the front-rear direction. A battery 4 is detachably attached to the lower end of the handle portion 2B. The battery 4 includes three lithium ion batteries 10 . A switch 5 is provided at the upper end of the handle portion 2B. The switch 5 is used to turn on and off the power supplied from the battery 4 to the motor 3 to start and stop the motor 3 .

The control board 6 is accommodated in the space of the lower part of the handle part 2B. A wire 7 extending from the control board 6 is connected to the motor 3 through a switch 5 . An indicator lamp 8 constituted by LED (Light Emitting Diode) is embedded in the rear lower surface of the handle portion 2B. The indicator lights 8 are connected to the control board 6 by wires 9 . The indicator light 8 is used to emit light of different colors according to the remaining amount and torque of the battery 4 .

A hollow cylindrical gear case 15 is provided in the main body portion 2A for accommodating a planetary gear mechanism 11 to be described later. The output shaft 12 is arranged to engage the planetary gear mechanism 11 . The front portion of the output shaft 12 serves as an end bit holding portion 12a. The planetary gear mechanism 11 decelerates the rotation of the output shaft 3a, and transmits the decelerated rotation to the output shaft 12 for rotatably driving the end bit holding portion 12a at a predetermined speed and torque.

The drive drill 1 also includes a torque adjustment mechanism 13 . The torque adjustment mechanism 13 is covered by a hollow cylindrical cover 14 rotatably mounted on the front end of the main body portion 2A. Rotation of the shroud 14 makes it possible to adjust the maximum torque that can be transmitted from the electric motor 3 to the output shaft 12 . The cover 14 is constructed of transparent or translucent resin. The cover 14 has an inner circumferential surface 14i. The cover 14 is formed with a spline groove 14g for engaging a pressing member 30 to be described later. A prism 37 (described later) is fixed to the cover 14 .

The driving force transmission mechanism including the planetary gear mechanism 11 and the torque adjustment mechanism 13 will be described in more detail with reference to FIG. 4 .

The planetary gear mechanism 11 has a three-stage reduction mechanism. The first stage reduction mechanism includes a pinion gear 16 , a ring gear 17 , a plurality of planetary gears 18 , a plurality of shafts 19 and a carrier 20 . The pinion gear 16 is integrally provided at the output shaft 3 a of the motor 3 . A ring gear 17 is fixed to the inner circumference of the gear case 15 . Each of the plurality of planetary gears 18 meshes with both the pinion gear 16 and the ring gear 17 . A plurality of planetary gears 18 is connected to a carrier 20 through a corresponding one of a plurality of shafts 19 . Each of the plurality of planetary gears 18 moves circularly around the pinion gear 16 while rotating around the shaft 19 . The circular motion of the plurality of planetary gears 18 rotates the carrier 20 .

The second stage reduction mechanism includes a sun gear 21 , a ring gear 22 , a plurality of planetary gears 23 , a plurality of shafts 24 and a carrier 25 . The sun gear 21 is integrally provided at the bracket 20 . A ring gear 22 is fixed to the inner circumference of the gear case 15 . Each of the plurality of planetary gears 23 meshes with both the sun gear 21 and the ring gear 22 . A plurality of planetary gears 23 are connected to a bracket 25 through a corresponding one of the plurality of shafts 24 . Each of the plurality of planetary gears 23 moves circularly around the sun gear 21 while rotating around the shaft 24 . The circular movement of the plurality of planetary gears 23 rotates the carrier 25 .

The third-stage reduction mechanism includes a sun gear 26 , a ring gear 27 , a plurality of planetary gears 28 , a plurality of shafts 29 and the output shaft 12 . The sun gear 26 is integrally provided at the bracket 25 . The ring gear 27 is supported by the inner circumference of the gear case 15 so as to be selectively rotatable and non-rotatable as explained later. Each of the plurality of planetary gears 28 meshes with both the sun gear 26 and the ring gear 27 . The plurality of planetary gears 28 are connected to the output shaft 12 through a corresponding one of the plurality of shafts 29 . When the ring gear 27 is fixed and non-rotatable, each of the plurality of planetary gears 28 moves in a circle around the sun gear 26 while rotating around the shaft 29 , thereby rotating the output shaft 12 . When the ring gear 27 is rotatable, each of the plurality of planetary gears 28 only rotates around the shaft 29 without moving circularly around the sun gear 26 , thereby transmitting no rotation to the output shaft 12 .

Next, the torque adjustment mechanism 13 will be described. The front portion of the gear case 15 serves as a cylindrical portion 15a. The cylindrical portion 15a has a smaller diameter than other portions of the gear case 15, and the outer circumference of the cylindrical portion is formed with screw threads. The pressing member 30 is threadably engaged with the outer circumference of the cylindrical portion 15a so that the pressing member 30 can move in the axial direction (rear-rear direction) while rotating. The pressing member 30 has a radial extension 30 a extending in the radial direction of the output shaft 12 . The pressing member 30 is spline-fitted with the inner circumference of the cover 14 (the radially extending portion 30a is engaged with the spline groove 14g), so that the pressing member 30 rotates together with the cover 14, and the pressing member 30 is axially aligned relative to the cover 14. removable. The bearing 31 is held by the cylindrical portion 15 a for rotatably supporting the output shaft 12 .

The ring gear 27 has a front end surface provided with a plurality of engaging claws 27a. Although only one engaging claw 27a is shown in FIG. 4, a plurality of engaging claws 27a are arranged at predetermined intervals in the circumferential direction. Each engagement claw 27a protrudes in the axial direction (forward). The plurality of balls 32 may abut on the plurality of engagement claws 27a.

A plurality of spacers 33 are installed in the gear case 15 to be movable in the axial direction. Although only one spacer 33 is shown in FIG. 4 , a plurality of spacers 33 are provided in one-to-one correspondence with a plurality of balls 32 . Each spacer 33 has one surface (rear surface) abutting on the ball 32 and the other surface (front surface) abutting on the annular clutch plate 34 . The coil spring 35 is disposed between the clutch disc 34 and the pressing member 30 in a compressed state. Therefore, the coil spring 35 pushes the ball 32 toward the front end surface of the ring gear 27 .

The drill drive 1 has an illuminating unit which enables the entire cover 14 to be illuminated. The lighting section includes an LED (Light Emitting Diode) 36 serving as a light source and a prism 37 serving as a light scattering section. As described above, the cover 14 is constructed of transparent or translucent resin. The LED 36 and the prism 37 are arranged inside the cover 14 .

The prism 37 serves to scatter the light emitted from the LED 36 over the entire prism 37 . As shown in FIGS. 5 and 6 , the prism 37 is molded into a substantially hollow cylindrical shape by transparent resin. The LED 36 is provided to face the lower portion of the rear end surface of the prism 37 . As shown in FIGS. 1 and 2 , a wire 38 connects the LED 36 to the control board 6 . The LED 36 is supplied with current from the battery 4 to emit light of high brightness. The light is then scattered around the entire circumference (in all directions) by the prism 37 so that the entire enclosure 14 is evenly illuminated.

When performing a screw driving operation using the driving drill 1 described above, a driving bit (not shown) is mounted on the end bit holding portion 12 a of the output shaft 12 . When the user turns on the switch 5 , current is supplied from the battery 4 to the motor 3 for starting the motor 3 . The rotation of the output shaft 3 a of the electric motor 3 is decelerated in three stages by the planetary gear mechanism 11 .

When the load torque applied to the output shaft 12 is less than a set value, the ring gear 27 of the planetary gear mechanism 11 is fixed by the thrust of the plurality of balls 32, thereby preventing the ring gear 27 from rotating. Accordingly, the three-stage decelerated rotation from the output shaft 12 is transmitted to the output shaft 12, thereby rotating a driving bit (not shown) at a predetermined speed to drive a screw (not shown) into a workpiece (not shown).

Conversely, when the load torque applied to the output shaft 12 exceeds a set value, the engaging claw 27 a of the ring gear 27 passes the ball 32 . Accordingly, the ring gear 27 is released from the fixed state and starts to rotate. At this time, each of the plurality of planetary gears 28 rotates around the shaft 29 without moving circularly around the sun gear 26 . Therefore, the rotation of the motor 3 is not transmitted to the output shaft 12 , so that an overload is applied to neither the planetary gear mechanism 11 nor the motor 3 . Therefore, damage to these parts can be prevented.

The user can adjust the maximum torque transmitted from the electric motor 3 to the output shaft 12 as follows. By rotating the cover 14 to move the pressing member 30 in the axial direction along the cylindrical portion 15a, the length of the coil spring 35 is changed, and thus the thrust of the ball 32 toward the ring gear 27 is changed. As shown in FIG. 2 , for example, when the pressing member 30 moves to the rear side for compressing the coil spring 35 , the reaction force of the coil spring 35 increases and the thrust of the ball 32 toward the ring gear 27 also increases. Therefore, the maximum torque transmitted from the electric motor 3 to the output shaft 12 can be set to a large value.

When work is performed using the above-described drive drill 1 in dark places such as attics and basements, high-brightness light emitted from the LED 36 is scattered in different directions by the prism 37, allowing the entire enclosure 14 to be uniformly illuminated. Therefore, it is possible to illuminate a large area around the end bit holding portion 12a, the end bit, and the workpiece, and in addition, no shadow is formed. Therefore, usability in dark places can be improved. In addition, in this embodiment, since the LED 36 emitting high-brightness light with small power consumption is used as a light source, necessary and sufficient brightness can be obtained. In addition, power consumption can be saved to prolong the life of the battery 4 .

Furthermore, in the above-described embodiment, the LED 36 and the prism 37 constituting the lighting section are arranged inside the cover 14 . Therefore, the LED 36 and the prism 37 are not exposed to the outside of the cover 14, thereby preventing the appearance of the drive drill 1 from being affected, and also preventing the LED 36 and the prism 37 from obstructing the user's work.

An electric power tool according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8 . The power tool of the second embodiment is applied to a driving drill 101 . In FIGS. 7 and 8 , the left side is referred to as the rear side of the drive drill 101 , and the right side is referred to as the front side of the drive drill 101 . For each element of the second embodiment, the same reference number as for the same element in the first embodiment plus 100 is used.

The driver drill 101 of the second embodiment includes a housing 102 having a main body portion 102A and a handle portion 102B. A motor 103 having an output shaft 103a is accommodated in the main body portion 102A. The switch 105 is provided at the upper front portion of the handle portion 102B. A battery (not shown) is detachably mounted to the lower end of the handle portion 102B. A gear case 115 is provided in the main body portion 102A. The gear box 115 has a cylindrical portion (screw member) 115a. A planetary gear mechanism 111 is housed in a gear case 115 for decelerating the rotation of the output shaft 103 a and for transmitting the rotation to an output shaft (spindle) 112 . The driving bit 140 is mounted on the front end of the output shaft 112 through the chuck 112a. The torque adjustment mechanism 113 is provided for adjusting the maximum torque that can be transmitted to the drive bit 140 .

A torque adjustment dial 114 is provided for adjusting the maximum torque in cooperation with the torque adjustment mechanism 113 . The torque adjustment dial 114 has a generally hollow cylindrical shape. The torque adjustment dial 114 has an inner circumferential surface 114i. A large number of concave portions and convex portions serving as light scattering portions are formed on the inner circumferential surface 114i. A torque adjustment dial 114 is rotatably provided to the front end of the main body portion 102A.

The cylindrical portion 115a has an outer peripheral surface formed with screw threads. A pressing member (screw accommodating member) 130 is threadably engaged with the outer circumferential surface of the cylindrical portion 115a, so that the pressing member 130 can move in the front-rear direction. The outer circumference of the pressing member 130 is spline-fitted with the inner circumference of the torque adjustment dial 114 . Accordingly, the pressing member 130 rotates together with the torque adjustment dial 114 while moving in the front-rear direction on the cylindrical portion 115a. Other parts of the torque adjustment mechanism 113 are basically the same as the torque adjustment mechanism 13 of the first embodiment. Therefore, the user can adjust the maximum torque transmitted to the output shaft 112 by rotating the torque adjustment dial 114 . It is to be noted that in FIG. 7 the upper and lower halves of the torque adjustment mechanism 113 with respect to the axis of rotation show different states of the drive drill 101 . More specifically, on the upper half side, the pressing member 130 is located on the front side so that the coil spring 135 is in a weakly compressed state. On the lower half, the pressing member 130 is located at the rear side, so that the coil spring 135 is in a strongly compressed state.

As shown in FIG. 7 , the drive drill 101 of the second embodiment includes two LEDs 136 arranged at the front end of the main body portion 102A, which is connected to the rear end of the torque adjustment dial 114 . Here, one of the two LEDs 136 is arranged at the top of the front end, and the other of the two LEDs 136 is arranged at the bottom of the front end. Two LEDs 136 are electrically connected to a battery (not shown) via wires 138 and switch 105 . A reflective plate (not shown) is provided on the rear side of each of the two LEDs 136 .

The torque adjustment dial 114 is explained in more detail with reference to FIG. 8 . FIG. 8 is a developed view showing the torque adjustment dial 114 drawn by developing the view around the torque adjustment dial 114 from a direction perpendicular to the driving bit 140 . The upper side of FIG. 8 corresponds to the front side of the drive drill 101 , and the lower side of FIG. 8 corresponds to the rear side of the drive drill 101 . The torque adjustment dial 114 is made of transparent resin. As shown in FIG. 8, the torque adjustment dial 114 has an outer peripheral surface displaying numerals "1", "5", "9", etc., which represent a set maximum torque value (torque setting value). More specifically, the outer circumferential surface of the torque adjustment dial 114 includes a display portion 114a having a zigzag shape (hatched area in FIG. 8 ) and a transparent portion 114b. The display portion 114a can be colored and opaque (opaque). Numerals "1", "5", "9" and the like representing torque setting values are displayed on the display portion 114a. The user can easily perform torque adjustment by rotating the torque adjustment dial 114 while visually checking these numbers. The transparent portion 114 b is a portion excluding the display portion 114 a from the outer circumferential surface of the torque adjustment dial 114 . The transparent part 114b is transparent or translucent, and can transmit light. It is to be noted that the transparent portion 114b includes a concave portion 114b1 having an inverted trapezoidal shape and an inclined portion 114b2 having a curved shape. The recessed portion 114b1 is recessed from the display portion 114a. The inclined portion 114b2 is an inclined surface connecting the recessed portion 114b1 and the display portion 114a. Since irregularities are provided on the outer circumferential surface of the torque adjustment dial 114 in this manner, the user can easily and accurately operate the torque adjustment dial 114 .

Therefore, in the case of driving the drill 101 in the second embodiment, when the user grips the handle portion 102B and turns on the switch 105 , power is supplied from a battery (not shown) to the motor 103 for starting the rotation of the motor 103 . The rotation of the motor 103 is transmitted to the output shaft 112 and the driving bit 140 mounted on the output shaft 112 . Power is also supplied to the two LEDs 136 for turning on the LED lights. LED light emitted from LED 136 illuminates the entire torque adjustment dial 114 . The torque setting value (number) is displayed on the opaque display part 114a, and sufficient brightness is provided by the transparent part 114b. Therefore, even in dark places such as attics and basements where natural light does not reach, the user can clearly see the torque setting value (number) displayed on the outer circumferential surface of the torque adjustment dial 114 . Therefore, with such a simple structure, torque adjustment can be easily and accurately realized in a dark place. In other words, the drive drill 101 can be set exactly to the desired torque. In addition, as explained above, since the reflection plate (not shown) is provided on the rear side of the two LEDs 136, the light emitted from the LEDs 136 does not leak toward the rear side, thereby allowing more part of the light to shine forward, that is, toward the torque adjustment The dial 114 illuminates.

While the invention has been described in detail with reference to the above aspects of the invention, it will be appreciated that various changes and modifications can be made to the invention by those skilled in the art without departing from the scope of the claims.

For example, in the first embodiment described above, the driver drill 1 is provided with the prism 37 which scatters the light emitted from the LED 36 into different directions for allowing the entire cover 14 to be uniformly illuminated. However, in the case where the prism 37 is not provided, a large number of concave portions and convex portions may be formed on the inner circumferential surface 14i of the cover 14 . With this arrangement, light emitted from the LEDs 36 is scattered (diffusely reflected) by a large number of concave and convex portions, allowing the entire cover 14 to be uniformly illuminated. Alternatively, a large number of concave portions and convex portions may be formed on the inner circumferential surface 14 i of the cover 14 in addition to providing the prism 37 . With this arrangement, the entire cover 14 can be more evenly illuminated.

In the first embodiment, the electric power tool of the present invention is applied to a driving drill 1 . However, the power tool of the present invention is also applicable to impact drivers and other hand-held power tools.

Similarly, in the second embodiment described above, the electric power tool of the present invention is applied to the driving drill 101 . However, the electric power tool of the present invention can also be applied to other electric power tools having a torque adjustment dial for adjusting torque by rotating the torque adjustment dial.

Claims (9)

1. electric tool comprises:

Housing, said housing have an end;

Motor, said motor is contained in the said housing, and is configured to produce rotary driving force;

End drill bit maintaining part, said end drill bit maintaining part are arranged on place, a said end, and can rotate around rotation;

Transmission mechanism, said transmission mechanism passes to said end drill bit maintaining part with said rotary driving force;

Cover, said cover is connected to a said end;

Lighting Division, said Lighting Division allow said cover to be illuminated; With

Torque adjustment mechanism, said torque adjustment mechanism is contained in the said housing, and is configured to regulate the peak torque that passes to said end drill bit maintaining part,

Wherein, said cover can rotate around said rotation, and as the torque adjustment dial of regulating said peak torque; And

Wherein, said torque adjustment dial is formed by transparent or semitransparent resin section construction.

2. electric tool according to claim 1, wherein, said Lighting Division comprises:

Radiative light source; With

Light scattering portion, said light scattering portion are formed on the different directions scattering from the light of said light emitted, thereby allow whole cover to be illuminated.

3. electric tool according to claim 2, wherein:

Said cover has hollow cylindrical shape, and is formed by transparent or semitransparent resin construction; And

Said light source and said light scattering portion are arranged in the said cover.

4. electric tool according to claim 3, wherein, said light scattering portion comprises the prism with hollow cylindrical shape.

5. electric tool according to claim 3, wherein, said cover has the inner circumferential surface that is formed with recess and lug boss.

6. electric tool according to claim 2, wherein, said light source comprises light emitting diode.

7. electric tool according to claim 1, wherein:

Said torque adjustment dial is the hollow cylindrical shape with external peripheral surface; And on said external peripheral surface the numeral of data representing torque setting value.

8. electric tool according to claim 7, wherein, said external peripheral surface comprises:

Display part, said numeral show that on said display part said display part is opaque; And hyalomere, said transmissive portions can transmitted light.

9. electric tool according to claim 2, wherein, said light source comprises light emitting diode.

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