JP2007223037A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent defects in continuity of a light source and disconnection of a connecting member in a power tool with a light having excellent operability to freely adjust an angle of irradiation in response to length of a tip tool and a fastening member, in a power tool such as an impact screwdriver and an oscillating drill in which excessive vibration occurs. <P>SOLUTION: The power tool is provided with: a motor as a driving source; a main body barrel part for housing the motor; a handle part 33 integrally provided with the main body barrel part; a cylindrical lever support part provided in the handle part; and a lever 9 having a first engagement part provided in the lever support part and a second engagement part to be engaged with the first engagement part and to be inserted into the lever support part. A lighting means is provided in the lever fixed by engagement of the first and the second engagement parts freely to turn with a release of engagement of the first and the second engagement parts. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power tool provided with a light that irradiates a tip tool and a fastening member.

  A conventional power tool will be described with reference to FIGS. FIG. 14 shows the external structure of the electric tool provided with the light 30. The rotating force is transmitted to the tip tool holding part 2 through the internal mechanical parts using the battery 5 as a power source, and the screws are tightened. A tool to loosen. The light 30 is provided on the upper part of the housing 1 so that the work place can be brightly illuminated in a dark place where light does not reach such as an attic or under the floor. When the light 30 is attached to the top of the housing 1, when building a wooden house, the light 30 gets in the way when working in narrow spaces such as metal fittings used for joining parts, and it is difficult to tighten screws was there.

  FIG. 15 is described in Japanese Utility Model Laid-Open No. 1-1117882, in which a light 30 is provided in front of the switch 4 trigger at the bottom of the housing 1. When the light 30 is attached to the lower part of the housing 1 in front of the switch 4 trigger, it becomes close to the switch 4 trigger for operating the on / off of the tool, and there is a problem that hinders the operation.

  The ones described in Japanese Utility Model Laid-Open No. 3-79279 and Japanese Patent Laid-Open No. 10-44064 are those in which the light 30 is attached to the lower part of the grip portion of the tool body, but because the light irradiation direction is fixed, the length of the bit is 60 mm to When it changed to 150 mm, it was difficult to see the light because it was not always possible to shine light on the engaging part of the bit and screw head.

  In order to solve this problem, as described in JP-A-2001-300867, a light emitter is provided at the lower part of the grip part and the illumination direction can be adjusted with a flexible shaft. The light was flexible and it was hard to see the light.

  In the conventional power tool, since the light 30 is directly attached to the housing 1, problems such as poor conduction of the light emitter and disconnection of the connecting member have occurred due to vibration generated during the work of the tool.

  Japanese Utility Model 3-79279, Japanese Utility Model 1-17-1882, Japanese Utility Model 55-151409 are equipped with a switch for turning on and off the lighting device, but the battery is consumed when not in use due to forgetting to turn it off. There was also a problem that it did not light up when used.

  The lights described in Japanese Utility Model Publication No. 3-79279, Japanese Utility Model Application Publication No. 1-1117882, Japanese Utility Model Application Publication No. 55-151409, Japanese Patent Application Laid-Open No. 2001-300867, Japanese Patent Application Laid-Open No. 10-44064, etc. are irradiated from one direction. When biting, the shadow of the bit is reflected on the mating material, which is confusing and difficult to use. Conventionally, a white incandescent lamp is generally used, but the contrast seen by light is weak, and as a result, when trying to obtain the required brightness, it is necessary to increase the wattage of the light emitter. As a result, the battery becomes larger and the operability becomes worse. In addition, when working in a high place and in a dim place while climbing up a stepladder, you may want to use a hook that hooks the tool on a waist belt or a stepladder, in addition to the lighting device, because it is difficult to place the main unit. However, if both are attached to the main body separately, the main body becomes large and expensive.

The prior art problems are summarized as follows.
(1) If a light is provided on the upper part of the tool body, it becomes an obstacle in narrow work.
(2) Trigger on the lower part of the tool body-In front of the trigger, it hits the finger during operation and gets in the way.
(3) When the light irradiation direction is fixed, it is difficult to see because the position where the light hits cannot be changed according to the length of the bit.
(4) Even if it is a flexible shaft, light is shaken by the vibration at the time of tool work, and it is hard to see.
(5) If the on / off switch of the light source is simply on / off, you may forget to turn it off and you may not be able to use it when you want to use it.
(6) It is difficult to see the bit shadow due to irradiation from an oblique direction.
(7) When the light is directly attached, vibration during tool work is applied to the light, which easily causes poor conduction.
(8) With white light, the contrast is weak and the light source is enlarged.
(9) Make hooks and lighting devices small and unobtrusive.

  An object of the present invention is to provide an electric tool with a light that solves the above problems, is easy to see, has high reliability, and has good operability.

The above object is achieved by the following means for each of the above problems.
(A) As a means for solving the problems (1), (2), (3), and (4), a lever that can be rotated and fixed at a plurality of angular positions is provided at the lower part of the grip portion, and a light is attached thereto.
(B) Moreover, as a solving means of (7), it fixes between a lever and a main body side via an elastic body.
(C) Also, as a means for solving (3) and (8), the lever length is variable.
(D) Further, as a solution to (9), an appropriate gap is provided between the lever and the housing, and the lever incorporated in the lighting device is also used as a hook.
(E) Further, as a means for solving the problem (8), it is possible to reduce the size of the battery by using a light emitting diode with low current consumption and to make the light emission color yellow instead of white so that the contrast is clear and small and easy to see.
(F) Further, as a solution to (5), a timer circuit is built in each time the light source is turned on and off automatically after a predetermined time has elapsed.
(G) Further, as a solving means of (6), a light having a ring-shaped light-transmitting portion that emits light almost entirely around the bit is provided in the hammer case (tool tip portion).
(H) Further, as another solution of the solving means (1) and (2), a light is provided on the trigger upper portion.

According to the present invention,
(A) A lever that can be rotated and fixed at a plurality of angular positions is provided at the lower part of the grip part, and a light is attached to the lever so that it does not obstruct the switch operation or the surroundings, and the irradiation angle is changed. Therefore, even if the length of the bit changes, it can be adjusted to an optimal position and can be fixed at an arbitrary position, so that it can be comfortably operated without being touched by light during use.
(B) Since the elastic body is fixed between the lever and the main body, vibration during operation is difficult to be transmitted to the lamp and the circuit, disconnection is prevented, and reliability is improved.
(C) Since the lever length is variable, it is easy to see and adjust the part where the light strikes according to the length of the bit, and the light source can be directed to the work site, so it is possible to use a small light source, making it compact Can be achieved.
(D) A moderate gap is provided between the lever and the housing, and the lever incorporated in the lighting device is also used as a hook, so that the hook and the lamp can be easily used at a high place and can be miniaturized. .
(E) The size of the battery is reduced by using a light emitting diode that consumes less current, and the light emission color is made yellow instead of white, so that the contrast is clear and small and easy to see.
(F) A timer circuit is built in to turn on and off the light source, and can be automatically turned off after a certain period of time, thus preventing battery consumption.
(G) Since a light having a ring-shaped light-transmitting portion that emits light over almost the entire circumference surrounding the bit is provided on the hammer case (tool tip), it is not shaded and is easy to see during operation.
(H) By providing a light at the top of the trigger, it is easy to work without interfering with the finger operating the switch.
As described above, it is possible to provide a lighting device that is small and does not get in the way and has high reliability.

  One embodiment in which the illumination device in this embodiment is applied to an electric power tool such as an impact driver will be described with reference to FIGS. FIG. 1 shows an impact driver having an outer frame such as a housing 1 and a hammer case 3, which is substantially T-shaped, and an electric or pneumatic drive is provided on a main body body formed by the housing 1. A trigger switch 4 for accommodating a motor, a planetary gear portion (not shown) constituting a speed reduction mechanism portion, etc., which is a power source, and supplying electric power to the motor in a handle portion 33 hanging from the main body body portion. And contacts that are electrically connected to the connection terminals of the battery 5 are accommodated. Further, a hammer case 3 disposed in contact with the housing 1 has a striking mechanism section for converting the rotational power of the motor into a striking force and a tip tool holding section 19 for retaining a bit and the like. Etc. are housed.

  The impact driver is provided with a lever 9 which can be rotated and has means for fixing as described below.

  A cylindrical lever support portion (A) 6, a lever support portion (B) 7 provided in communication with the housing 1, and a spring 8 are passed through the shaft portion 10 of the lever 9 so that the axial direction of the spring 8 By fixing the retaining holder 11 that resists movement with a nut 15 embedded in the shaft portion 10, lever support (A) 6 and lever support using the axial force acting on the spring 8 The part (B) 7 is held. The lever support portion (A) 6 and the lever support portion (B) 7 are provided with engagement teeth (A) 12 and engagement teeth (B) 13 on a part of their inner surfaces. -Engagement with the fitting teeth 14 (see FIG. 6) provided on the shaft portion 10 by the force acting in the axial direction of the spring 8 which is always biased between the support portion (A) 6 and the retainer holding portion 11 The artificial tooth (A) 12 always keeps meshing. Thereby, the lever 9 is prevented from rotating.

  Next, the structure of the lever 9 will be described with reference to FIG. The lever 9 incorporates an LED light emitter 16 that emits yellow light, a lens 17 made of a transparent resin plate or the like that protects the light emitter 16, and a power source 23 such as a rechargeable storage battery or a dry battery. On one side of the lever 9, a push button type switch 18a for turning on the light emitter 16 and a switch 18b for turning off the light emitter 16 are provided. The switches 18a and 18b and the LED light emitter 16 are attached to a substrate 32, and a semiconductor timer circuit 19 is mounted on the substrate so that the LED 16 is automatically turned off 30 seconds after the switch 18a is turned on. Since the LED and semiconductor circuit of the lever are relatively thin, they are arranged in the handle portion of the hook where the lever is hooked, and the relatively large battery 23 is arranged in the thick root portion of the lever, and one of the shaft portions 10 coming out from there. A fitting tooth 14 that meshes with the fitting tooth 12 of the handle is formed in the part. A rubber elastic washer 22 having a thickness of about 2 mm is provided at the base of the shaft 10.

  Next, operation | movement of the illuminating device of this invention is demonstrated. According to the present invention, when the lever 9 is pulled about 5 mm in the left direction in FIG. 2, the engagement teeth (A) 12 and the engagement teeth 14 are disengaged, and the lever 9 is removed from the shaft portion 10 as shown in FIG. It can be rotated to an arbitrary position clockwise around the center. 4 and 5 show irradiation states when the lengths of the tip tool 20 and the fastening member 21 such as a screw are different. When the irradiation position is close (the tip tool 20 and the tightening member 21 such as a screw are short), the angle of the lever 9 is increased (40 degrees in this machine) to irradiate and the irradiation position is far away (the tip) If the tool 20 and the tightening member 21 such as a screw are long), the angle of the lever 9 is reduced (20 degrees in this machine) and irradiated to correspond to the length of the tip tool 20 and the tightening member 21. Can be irradiated and can work comfortably.

  When the bit is short as shown in FIG. 4, the lever 8 is released at a large angle, and when the bit is long as shown in FIG. By returning to the direction, the engaging tooth (A) 12 and the fitting tooth 14 are engaged again at that position, and cannot be rotated and can be fixed. As a result, even if there is vibration during work, the levers engage and do not move, so the light does not shake and is easy to see. In addition, when this lighting device is not used, the lever 9 may be in the way, making it difficult to work. In this case, if it is returned to its original position as shown in FIG. 1, it will be easy to work without interfering with the grip of the handle. Also, in order to eliminate the difficulty of using the tool depending on whether the operator is right-handed or left-handed, the lever 9 and the spring 8 can be easily removed by simply removing the retaining holder 11. By taking out the holding part 11, it is possible to assemble the handle on the opposite side.

  Next, lighting on / off operation will be described with reference to a lighting circuit diagram shown in FIG. First, the base current is supplied to Tr1 by pressing the ON switch 18a in FIGS. 6 and 7, and Tr2 is also turned on when Tr1 is turned on. When Tr2 is turned on, energization of the timer circuit 19 and the LED is started. Here, both the ON and OFF switches are momentary switches, and the contacts are opened when the operator releases the hand. The timer circuit sets the output Vt to the L state immediately after the start of energization, so that Tr1 and Tr2 are kept on even after the operator releases the ON switch, and the energization to the LED and the timer circuit is self-maintained.

  In the case of turning off the light, by pressing the OFF switch 18b, the base-emitter voltage of Tr2 becomes zero, Tr2 is turned off, and the LED is turned off. If the operator forgets to turn it off, the timer circuit 19 sets the output Vt to the L state after 3 minutes, for example, whereby the supply of the base current of Tr1 is stopped and Tr1 is turned off. When Tr2 is turned off, the supply of base current to Tr2 is also stopped. When Tr2 is turned off, the ED is automatically turned off, thereby preventing battery consumption due to forgetting to turn it off.

  By adopting yellow LED instead of white for the light emitter 16, the contrast can be made clear and the tip tool 20 and the fastening member 21 to be irradiated can be clearly seen.

  In addition, since the contrast is large, the amount of electricity consumed is small, and the battery and the circuit can be downsized.

  Next, a configuration for reducing the vibration applied to the lever 9 will be described. FIG. 2 is an AA cross-sectional view of the lever described above. A recess 9a is formed on the end surface of the lever that is abutted against the housing, and a convex portion is provided on the elastic body 22 to be locked together. The inner surface of the retaining holder 11 in which the coin groove is embedded, and a lever support portion (B ) The elastic body 22 is always brought into contact with the end surface of the lever support portion (A) 6 by the load of the spring 8 placed between 7). The elastic body 22 is arranged so that the both ends of the lever support portion (A) 6 and the lever support portion (B) 7 are sandwiched between severe vibrations generated in the rotation direction from the main body when the impact driver is used. For this reason, it is possible to suppress the vibration by blocking the path through which the vibration is transmitted (between the main body that is the vibration generation source and the lever 9).

  As a result, even if the lighting device is applied to an electric tool that generates severe vibration such as an impact driver, it is possible to prevent poor conduction of the light emitter 16 and disconnection of the connecting member. Since the lever 9 is detachable, it can also be used as a hand light. Also, since the lever 9 and the main body grip are provided with an appropriate distance L (around 20 mm), the waist of the operator It can have the function of hooking the main body on a belt or a stepladder, so that the main body can be placed at a high place. In addition, since the LED, board, and battery are laid out in the layout shown in Fig. 6, the hook is thin and small, and the two functions of the hook and lighting are combined into one, so it is convenient and not in the way. is there.

  FIG. 8 shows another embodiment of the power tool illumination device. In FIG. 8, an illumination device is attached to the tip side of the tool body 109 so as to cover the tip of the hammer case 124 in a ring shape. In FIG. 9, three light emitters 122a, 122b, and 122c are arranged at intervals of 120 degrees on the circumference around the bit 110, and the battery 123 that drives the light emitter, and the light emitters are turned on and off. The ON switch 125a and the OFF switch 125b to be performed are also arranged in the same part. In the form of wrapping these parts, there is a lens 121 on a transparent plastic circular tube. In FIG. 14, the light emitter of this embodiment is a yellow LED and is attached to a donut-shaped substrate 126, and the ON switch 125 a, the OFF switch 125 b, and the battery 123 are also mounted on the substrate 126. The timer circuit and the LED drive circuit are also mounted.

  Next, the operation of the ring illumination device will be described. When the operator presses the ON switch 125a with a finger to turn it on, the three light emitters 122 are turned on for about 3 minutes. The light from the illuminant is irradiated by the lens in the direction of the bit 110 or the wood screw 112. Here, since a plurality of illuminants surround the bit, the shadow of the bit generated by one of the illuminants (this is The other material 111 and the cross hole of the wood screw 112 are difficult to see) are canceled out by the light of the other light emitting body, and as a result, the shadow of the bit does not occur, the tip of the bit is very easy to see, and the workability is good. In addition, if the OFF switch 125b is pressed, the light is turned off immediately, and even if there is an erroneous operation or forgetting to turn it off, the light is automatically turned off after 3 minutes, thus preventing battery consumption. Since an LED is used, the current consumption is 1/10 or less of a normal incandescent light bulb, and a commercially available AA battery can be used, which is small and economical.

  As a modification, instead of multiple light emitters, use a single light emitter, make the lens like frosted glass, make fine irregularities, or contain a light-emitting paint so that the entire donut-shaped lens glows with a single light emitter But the effect is the same.

  11 and 12 show still another embodiment of the electric tool lighting device. A lens 100 and a light emitter 101 are disposed directly above a trigger 105 of a main switch for turning on and off the motor of the tool body 109, and inside the handle grip portion 107 via a cord 104 from the switch 102 for controlling the light emitter 101. To the substrate 103 and to the tool battery 106.

  Next, operation | movement of this illuminating device is demonstrated. When the switch 102 for driving the light emitter is turned on, the light emitter (LED) disposed immediately above the trigger 105 is turned on by the timer of the substrate 103 and the LED drive circuit, and the wood screw 112 at the tip of the bit 110 is passed through the lens 100. Is irradiated. Here, since the light emitter 101, the lens 100, and the switch 102 are arranged directly above the trigger 105, even if the index finger is extended in the bit tip direction from the state where the operator grips the handle for screw tightening, It is easy to use without causing any obstacles such as the fingertip hitting the light.

  In addition, since the light emitter is disposed in the gap between the trigger and the gear portion inside the resin housing, it does not protrude outward from the main body 109, the hammer case 124, the battery 106, etc. It won't get in the way when you hit it. Further, in this example, unlike the example described above, a storage battery different from the main body driving battery is not used, but power is supplied from the main body driving battery. There is an advantage that wiring is easy and the mounting surface can be made compact.

  FIG. 13 shows a case where the length is extended and retracted to a pivotable latching lever 9 whose position with respect to the tool body can be changed easily. The lever 9 includes a telescopic switch 24 for making the lever 9 telescopic, a movable part 26 for making the tip head 25 movable, and the lever 9 telescopic so that the tip head is movable. By doing so, the tip head portion 25 is brought close to the bolt 29. Thereby, since it can irradiate with light in a closer form, it is easy to see. Furthermore, as a modification, a paint spray nozzle may be provided instead of the lamp. By turning on the spray button 28 in FIG. 13, the paint is sprayed on the bolt 29, and the paint 27 can be applied accurately and easily. When bolting at a construction site, it may be difficult to tell whether the bolt 29 has been tightened or not, and it may be difficult to know whether it has been tightened. If the paint 27 is sprayed onto the bolts 29 immediately after tightening, it can be understood at a glance that the tightening has been achieved, and this will prevent forgetting to tighten.

It is an external view of the electric tool which shows one Example of this invention. It is a fragmentary sectional view showing one example of the present invention. It is a partial external view which shows one Example of this invention. It is an irradiation state figure which shows one Example of this invention. It is an irradiation state figure which shows one Example of this invention. It is sectional drawing which shows one Example of this invention. It is a circuit diagram which shows one Example of this invention. It is sectional drawing of the electric tool which shows another Example of this invention. It is a front view of the electric tool which shows another Example of this invention. It is a fragmentary sectional view of the electric tool which shows another Example of this invention. It is sectional drawing of the electric tool which shows another Example of this invention. It is a fragmentary sectional view of the electric tool which shows another Example of this invention. It is an external view of the electric tool which shows another Example of this invention. It is an external view of the electric tool by a prior art. It is an external view of the electric tool by a prior art.

Explanation of symbols

  1 is a housing, 2 is a tool holder, 3 is a hammer case, 4 is a trigger switch, 5 is a battery, 6 is a hook support (A), 7 is a hook support (B), 8 is a spring, 9 Is a hook, 10 is a shaft, 11 is a retaining holder, 12 is an engagement tooth, 13 is an engagement tooth (B), 14 is a fitting tooth, 15 is a nut, 16 is a light emitter, 17 is a lens, 18 Is a switch, 20 is a tip tool, 21 is a tightening member, and 22 is an elastic body.

Claims (3)

A motor,
A tip tool driven by the motor;
A body fuselage for housing the motor;
A handle portion provided to be continuous with the main body body portion;
A trigger switch for turning on / off the power supply to the motor;
A light unit for irradiating light toward the tip tool, the light unit having a light that emits light, and a light switch for turning on / off power supply to the light;
In the electric tool with
The light switch can be turned ON / OFF regardless of the ON / OFF state of the trigger switch,
An electric tool comprising a timer circuit that automatically turns off a light switch when a predetermined time has elapsed after the light switch is turned on. The power tool according to claim 1, wherein the light switch is provided in the handle portion. 2. The light according to claim 1, wherein the light is provided at a lower portion of the handle portion, and a direction in which light emitted from the light is directed toward the tip tool is inclined with respect to an axis of the tip tool. Item 3. The electric tool according to any one of Items 2.

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