JP4111173B2 - Portable electric tool - Google Patents

Description

  The present invention relates to a portable power tool, and more specifically, a hand-held type used for tightening work such as bolts, nuts or wood screws, drilling work for metalwork, woodworking, mortar, concrete, etc., cutting work for metalworking, woodworking, etc. This electric tool relates to a technique for providing a display setting unit for performing LED display.

  Conventionally, the display of the work completion status, the setting of the tightening force, and the remaining battery capacity, etc., if rechargeable, were mounted on the printed circuit board when performing the rotation control of the motor. The light from the LED (light emitting diode) is transmitted through the outer light transmitting portion. LEDs are widely used in the field of portable power tools because they are resistant to vibration and repeated ON / OFF lighting (see, for example, Patent Document 1).

  However, when the LEDs 14 are close to each other, light leaks to the adjacent light transmission part 11 and the display becomes difficult to see. As a countermeasure, as shown in FIG. 7, a method of projecting the wall-shaped rib 16 ′ from the periphery of the light transmitting portion 11 of the outer portion 5 a to the vicinity of the printed circuit board 10, or the discrete LED 14 shown in FIG. There is a method in which a wall-like rib 16 ″ protrudes from the periphery of the light transmitting portion 11 of the outer portion 5 a to a position covering the LED 14. In the figure, 21 is a skin film.

However, when an impact is applied to the outer portion 5a due to a fall, a drop, or the like, the outer portion 5a may be deformed to destroy the printed circuit board 10 or the LED 14. For this reason, conventionally, it is necessary to increase the strength of the outer portion 5a, the strength of the printed circuit board 10, and the adhesive strength of the LED 14, and it has been difficult to reduce the size and weight.
JP 2003-275974 A

  The present invention has been invented in view of the above-described conventional problems, and can absorb the shock from the outer portion with a buffer member to protect the printed circuit board and the LED, thereby facilitating the reduction in size and weight. It is an object of the present invention to provide a portable electric tool that can prevent a phenomenon in which light leaks to an adjacent light transmitting portion by a buffer member and makes an LED display of a display setting portion easy to see.

  In order to solve the above problems, in the present invention, the drive unit 2 for transmitting the rotation of the motor 1, the switch unit 4 for instructing the rotation of the motor 1, the motor 1, the drive unit 2, and the switch unit 4 are provided. A portable electric tool including a housing 5 that covers each of them and a display setting unit 9 that displays the state and settings of the electric tool 6 with the LED 14 on the printed circuit board 10, and an outer portion 5 a that covers the display setting unit 9. A light transmitting portion 11 through which light is transmitted is provided, and an insulating buffer member 13 is interposed in a space S provided between the printed board 10 and the outer portion 5a, and light from the LED 14 is passed through the buffer member 13 to the LED 14 And an opening 15 for reaching only the light transmitting portion 11 of the outer shell portion 5a facing the outer shell 5a.

  With this configuration, the shock absorbing member 13 can absorb the shock from the outer portion 5a and protect the printed circuit board 10 and the LED 14, so that the outer surface can be prevented in order to prevent the printed circuit board 10 or the LED 14 from being destroyed as in the conventional case. There is no need to increase the strength of the portion 5a, the strength of the printed circuit board 10, and the adhesive strength of the LED 14, and the size and weight can be easily reduced. In addition, the opening 15 of the buffer member 13 prevents the light from the LED 14 from reaching the adjacent light transmitting portion 11 and prevents light from leaking to the adjacent light transmitting portion 11 (showing the LED display). LED display becomes easy to see.

  Further, wall-shaped ribs 16 project from the periphery of the light transmission part 11 of the outer shell part 5a, and the size of the opening 15 of the buffer member 13 is set to be equal to or smaller than the opening region of the light transmission part 11 of the outer shell part 5a. In this case, the wall-shaped ribs 16 can ensure the durability of the outer portion 5a against falling or dropping, and can effectively prevent the reflection of the LED display.

  Further, it is preferable to provide a gap G between the outer shell part 5a and the buffer member 13, and in this case, the space S between the outer shell part 5a and the buffer member 13 is further increased by the gap G. When the 5a is deformed, the printed circuit board 10 or the LED 14 can be reliably prevented from being damaged.

  In the portable power tool according to the present invention, the shock absorbing member absorbs the impact from the outer portion, the printed circuit board and the LED can be protected, and it is easy to reduce the size and weight. Thus, a phenomenon in which light leaks (a side effect of LED display) can be prevented, and a display setting unit that makes it easy to see the LED display can be obtained.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  FIG. 2 is a schematic view of a portable power tool 6 (hereinafter simply referred to as “power tool 6”) of the present invention, FIG. 3 is a perspective view, and FIG.

  The electric tool 6 is an impact tool, an electric drill driver, or the like. The motor 1, the drive unit 2 that transmits the rotation of the motor 1 at a reduced speed, the output shaft 3 that outputs the rotation output of the drive unit 2, and the motor 1 Switch unit 4 for instructing rotation, rotation sensor 17 for outputting a rotation signal of the motor 1, control circuit 18 for controlling rotation of the motor 1 by the signal from the rotation sensor 17 and the switch unit 4, and the state of the electric tool 6 And a display setting unit 9 for displaying the setting on the LED 14 on the printed circuit board 10.

  The housing 5 is provided with a trigger portion 4a of the switch portion 4 in a grip portion 7 to be gripped by hand, and a cylinder portion 8 in which a motor 1, a drive portion 2, and a part of an output shaft 3 are partially built in an upper end portion of the grip portion 7. The battery pack mounting portion 19 is detachably attached to the lower end portion of the grip portion 7. Reference numeral 20 in the figure denotes an attaching / detaching operation button of the battery pack mounting portion 19.

  In this example, the display setting unit 9 and the control circuit 18 are disposed on the front protruding portion 5b of the housing 5 close to the battery pack mounting portion 19, but may be disposed on the housing 5 side behind the motor 1, for example. It is. Moreover, although the operation part 12 (FIG. 3) which switches the mode of the electric tool 6 is provided in the area | region of the display setting part 9, you may provide in the position different from the display setting part 9. FIG.

  The control circuit 18 is composed of a microcomputer for controlling the maximum rotation speed of the motor 1, and the LED 14 is mounted on the printed circuit board 10 in the control circuit 18. In addition, D in FIG. 1 has shown the irradiation range of LED14.

  As shown in FIG. 1, the outer portion 5a (display panel) that covers the display setting unit 9 includes a light transmission unit 11 through which light passes. In this example, the outer portion 5 a constitutes a part of the housing 5. The outer portion 5 a is made of a light-shielding material, and a portion facing the LED 14 is opened. This opening is the light transmitting portion 11.

  Here, in the present invention, the outer portion 5 a is disposed with a predetermined space S from the printed board 10, and an insulating buffer member 13 is interposed in the space S. The insulating buffer member 13 is made of, for example, silicon rubber and functions to protect the printed circuit board 10 and the LED 14 from vibration, impact, and the like. The buffer member 13 is provided with an opening 15 for allowing the light from the LED 14 to reach only the light transmitting portion 11 of the outer portion 5 a facing the LED 14. The opening 15 has such a size that the light from the LED 14 does not reach the adjacent light transmitting portion 11. That is, the opening 15 of the buffer member 13 is arranged so as not to block the light from the LED 14 on the printed circuit board 10 in the vertical direction of the printed circuit board 10, and further, in the vertical direction, the display setting unit 9, the light transmission part 11 of the outer shell part 5a is arranged so that the light of the LED 14 can reach outside through the light transmission part 11. Further, in order to prevent dust and the like from entering the control circuit 18, a transparent or translucent skin film 21 or a label is attached to the light transmitting portion 11 of the outer portion 5a.

  Here, the space S between the outer portion 5a and the printed circuit board 10 is equal to or larger than the amount that the outer portion 5a of the display unit may be deformed due to dropping or vibration, that is, a width corresponding to the deformation amount. In this example, the thickness of the buffer member 13 is set so that a gap G is generated between the outer shell 5 a and the buffer member 13. Note that the width of the space S may be equal to or greater than the thickness of the buffer member 13, and the gap G between the outer portion 5 a and the buffer member 13 is not necessarily provided.

  Thus, since the insulating buffer member 13 is interposed in the space S provided between the printed board 10 and the outer portion 5a, the shock absorbing member 13 absorbs the shock from the outer portion 5a, and the printed board 10 and the LED 14 are removed. Can protect. Accordingly, it is not necessary to increase the strength of the outer portion 5a, the strength of the printed circuit board 10, and the bonding strength of the LEDs 14 in order to prevent destruction of the printed circuit board 10 or the LED 14 as in the prior art, and the size and weight can be easily reduced. Further, since the light from the LED 14 reaches only the light transmitting portion 11 of the outer shell portion 5a opposed to the light through the opening 15 provided in the buffer member 13, the light of the LED 14 is transmitted by the opening 15 of the buffer member 13. By setting the size of the opening 15 so that the light of the LED 14 does not reach the adjacent light transmitting portion 11 and is not blocked, the phenomenon of light leaking to the adjacent light transmitting portion 11 (the side of the LED display) The display can be made easier to see.

  In the above embodiment, the light transmitting portion 11 of the outer portion 5a is formed with a simple opening (hole) as shown in FIG. 1, but not limited to this, as shown in FIG. You may make it project the wall-shaped rib 16. FIG. D in the figure indicates the irradiation range of the LED 14. The wall-like rib 16 makes it possible to ensure the durability of the outer portion 5a against falling or dropping. Further, in this example, as in the case of FIG. 1, the buffer member 13 is disposed so that the light irradiation range of the LED 14 does not reach the light transmitting portion 11 of the outer portion 5 a in the vertical direction of the adjacent LED 14. The size of the opening 15 of the buffer member 13 is set to be equal to or smaller than the opening area of the light transmitting portion 11 of the outer portion 5a. Thereby, the side effect of the LED display can be effectively prevented, and the display can be more easily seen. Further, in this example, a gap G is provided between the lower end portion of the wall-shaped rib 16 and the buffer member 13. Thereby, the space S between the outer shell part 5a and the buffer member 13 becomes larger by the gap G than the thickness of the buffer member 13, and even when the outer shell part 5a is deformed in the direction indicated by the arrow A in FIG. The wall-like ribs 16 do not come into contact with the printed circuit board 10 or the LEDs 14, and the printed circuit board 10 or the LEDs 14 can be reliably prevented from being damaged.

  The portable electric tool 6 according to the present invention is widely applied to those equipped with a display setting unit 9 that performs LED display.

It is sectional drawing explaining the display setting part of one Embodiment of this invention. It is a schematic side view of the portable electric tool provided with the display setting part same as the above. It is a perspective view of the portable electric tool same as the above. It is sectional drawing of the lower half part of the portable electric tool same as the above. It is sectional drawing of other embodiment. It is explanatory drawing when the outline part same as the above changes. It is explanatory drawing of the display setting part of a prior art example. It is explanatory drawing of the display setting part of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Drive part 4 Switch part 5 Housing 5a Outer part 6 Electric tool 9 Display setting part 10 Printed circuit board 11 Light transmission part 13 Buffer member 14 LED
15 Opening 16 Rib S Space G Gap

Claims (3)

  A drive unit that transmits the rotation of the motor, a switch unit that instructs the rotation of the motor, a housing that covers each of the motor, the drive unit, and the switch unit, and the state and settings of the power tool are displayed by LEDs on the printed board A portable electric tool comprising a display setting unit, wherein a light transmitting part through which light is transmitted is provided in an outer part covering the display setting part, and an insulating property is provided in a space provided between the printed circuit board and the outer part. A portable electric tool characterized in that a buffer member is interposed and an opening is provided in the buffer member so that light from the LED reaches only the light transmitting portion of the outer portion facing the LED.   The wall-shaped rib protrudes from the periphery of the light transmission part of the outer shell part, and the size of the opening of the buffer member is set to be equal to or smaller than the opening region of the light transmission part of the outer shell part. Portable electric tool. The portable electric tool according to claim 1, wherein a gap is provided between the outer shell and the buffer member.

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