JP4923883B2 - Electric tool - Google Patents

Description

  The present invention relates to a power tool including a lighting light.

  For example, when working with an electric power tool such as an impact driver, if the work environment is a dark place where light does not reach, such as the attic or under the floor, the tip tool and the material to be tightened cannot be seen and the work can be performed. Can not.

Therefore, various proposals have been made to attach a light for irradiating light toward the tip tool or the material to be fastened to the power tool. For example, a proposal has been made to place a light directly above a trigger of a housing (see Patent Document 1). According to this, when an operator performs a work by holding a handle, the fingertip may hit the light. Therefore, workability is not harmed.
Japanese Patent Laying-Open No. 2003-212374 (FIGS. 11 and 12)

  However, when the light is arranged directly above the trigger of the housing as proposed in Patent Document 1, the distance between the light and the material to be fastened becomes long, so the light to illuminate the material to be fastened sufficiently. However, there is a problem that the illuminance required for the light source increases, the capacity of the light increases, and the size increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric tool that can illuminate an illumination spot sufficiently brightly even with a light having a small capacity and can reduce the size of the light. There is to do.

In order to achieve the above object, the invention described in claim 1 includes a housing having a body portion extending in the front-rear direction, a handle portion connected to the body portion, and a case attached to the front of the body portion, A transmission mechanism that transmits the rotation of a motor that is a drive source, and a striking mechanism that converts rotation transmitted from the transmission mechanism into a rotational striking force are housed in the case, and power is supplied to the motor. In the electric tool provided with a trigger for controlling the handle, a light having an LED and a substrate is attached to the case, the light and the case are covered with a protector, and lead wires extending from the substrate are connected to the protector and the housing. It is configured to cover with.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the light is attached inside a holder member made of a transparent resin, and the holder member is attached to a rib provided in the case .

According to the present invention, the light is closer to the illuminated part, the capacity is small and the illuminated part can be illuminated sufficiently brightly with a small light, and the light can be made compact and compact.

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

<Embodiment 1>
FIG. 1 is a perspective view of an impact driver as an embodiment of an electric power tool according to the present invention, FIG. 2 is a right sectional view showing an internal structure of the impact driver, and FIG. 3 is a perspective view showing a state where a protector of the impact driver is removed. FIG.

  First, the basic configuration and operation of the impact driver 1 according to the present invention will be described with reference to FIGS. 1 to 3. The illustrated impact driver 1 includes a housing 2 and a hammer case 3 (FIG. 2) which are outer frames forming an outer shape. The housing 2 includes a substantially cylindrical body portion 2A extending in the front-rear direction, and a handle portion 2B connected to the body portion 2A so as to form a substantially T shape in a side view. ing. Here, the hammer case 3 is a substantially cylindrical member made of an aluminum alloy, and is provided at the distal end portion of the housing 2 to constitute a part of the body portion 2 </ b> A of the housing 2.

  As shown in FIG. 2, a motor 4 as a drive source is accommodated in the body portion 2 </ b> A of the housing 2, and a reduction mechanism that decelerates the rotation of the motor 4 in the hammer case 3. And a striking mechanism that converts the rotation of the motor 4 decelerated by the planetary gear mechanism 5 into a rotational striking force and transmits it to a tip tool (not shown). Details of the striking mechanism will be described later.

  In addition, a switch 7 having a trigger 6 at the top is provided inside the handle portion 2B of the housing 2, and a switching lever 8 is provided below it. The lower part of the handle part 2B houses a battery receiving part 9, a substrate 10, and lead wires 11 and 12, and a battery 13 as a rechargeable power source is detachably attached to the lower end of the handle part 2B. Has been. Here, the power supply from the battery 13 to the motor 4 is performed from the two lead wires 11 through the switch 7 and the FET 14, and the power supply to the lighting light 15 attached to the lower end of the tip of the hammer case 3 is performed by the battery. 13 through the substrate 10 and the two lead wires 12.

  Thus, in such an impact driver 1, when the operator activates the trigger 6 to start the motor 4, the rotation of the output shaft (motor shaft) 4a of the motor 4 is decelerated by the planetary gear mechanism 5. The rotation is transmitted to the spindle 16, and the spindle 16 is rotationally driven at a predetermined speed. Here, the spindle 16 and the hammer 17 are connected by a cam mechanism, and this cam mechanism is formed on the V-shaped spindle cam groove 16 a formed on the outer peripheral surface of the spindle 16 and the inner peripheral surface of the hammer 17. It comprises a V-shaped hammer cam groove 17a and balls 18 that engage with these cam grooves 16a, 17a.

  The hammer 17 is always urged by a spring 19 in the distal direction (rightward in FIG. 2). When the hammer 17 is at rest, the ball 18 and the cam grooves 16a and 17a are engaged with each other to separate the gap from the end face of the anvil 20. In the position. And the convex part is each symmetrically formed in two places on the rotation plane where the hammer 17 and the anvil 20 face each other. Note that a tip tool (not shown) is detachably attached to the anvil 20.

  By the way, when the spindle 16 is rotationally driven at a predetermined speed as described above, the rotation of the spindle 16 is transmitted to the hammer 17 via the cam mechanism, and the hammer 17 is not rotated halfway before the hammer 17 is rotated halfway. The protrusion 17 is engaged with the protrusion of the anvil 20 and the anvil 20 is rotated. When the relative reaction force is generated between the hammer 17 and the spring 19 by the engagement reaction force, the hammer 17 Then, the spring 19 starts to retract toward the motor 4 side while compressing the spring 19 along the spindle cam groove 16a of the cam mechanism.

  When the protrusion of the hammer 17 moves over the protrusion of the anvil 20 due to the backward movement of the hammer 17 and the engagement between the two is released, the hammer 17 accumulates in the spring 19 in addition to the rotational force of the spindle 16. While being accelerated rapidly in the rotational direction and forward by the action of the elastic energy and the cam mechanism, the spring 19 is moved forward by the biasing force of the spring 19, and the convex portion is reengaged with the convex portion of the anvil 20 to be integrated. Begin to rotate. At this time, since a strong rotational striking force is applied to the anvil 20, the rotational striking force is transmitted to a screw (not shown) via a tip tool attached to the anvil 20.

  Thereafter, the same operation is repeated, and the rotational impact force is intermittently repeatedly transmitted from the tip tool to the screw, and the screw is screwed into a material to be tightened (not shown) such as wood.

  2 and 3, the light 15 is attached to the front of the trigger 6 at the lower outer periphery of the hammer case 3 and at the rear of the guide sleeve 3a at the tip of the hammer case 3. As shown in FIG. As shown in FIGS. 1 and 2, the outer periphery of the light 15 and the hammer case 3 is covered with a substantially cylindrical protector 21 made of a soft material such as an elastomer. The protector 21 is made of rubber or the like. It is fixed to the hammer case 3 by a ring-shaped stopper 22 made of an elastic body.

  Next, details of the mounting structure of the light 15 will be described with reference to FIGS.

  4 is a perspective view of a hammer case to which a light is attached, FIG. 5 is an exploded perspective view showing a structure for attaching the light to the hammer case, FIG. 6 is a view in the direction of arrow A in FIG. 4, and FIG. FIG. 8 is a cross-sectional view taken along the line CC of FIG. 6, and FIG. 9 is a perspective view of the holder member.

  As shown in FIG. 5, a rib 3 b is integrally protruded at the front end lower portion of the hammer case 3, specifically, at a position ahead of the trigger 6 and behind the guide sleeve 3 a at the tip of the hammer case 3. The rib 3b is threaded with a screw hole 3b-1.

  As shown in FIG. 5, the light 15 is composed of chip LEDs 24 arranged on a thin rectangular plate-like substrate 23, and the two lead wires 12 are horizontally arranged from above and below the back surface of the substrate 23. It extends.

  Thus, after the light 15 is inserted into the holder member 25 from above and fixedly held, the holder member 25 is attached to the rib 3b with the screws 26 as shown in FIGS. Is attached to the lower part of the front end of the hammer case 3.

  Here, the holder member 25 is integrally formed of a transparent resin such as acrylic, and the block-like main body portion 25A has a rectangular storage space 25a that opens upward and is narrow in the lateral direction. A slit-like fitting groove 25b is formed. Further, two left and right bifurcated leg portions 25B and 25C are integrally projected rearward from the back surface of the main body portion 25A, and a circular hole 25c is provided in one leg portion 25B in a lateral direction. Has been.

  Further, as shown in FIG. 9, a holding portion 25d that is bent in an L-shape is integrally formed at the end of the other leg portion 25C. Two fitting grooves 25d-1 extending horizontally are formed.

  Thus, as shown in FIG. 5, the chip LED 24 constituting the light 15 is stored in the holder member 25 by inserting the substrate 23 into the slit-like fitting groove 25 b of the holder member 25 from above. It is attached to the holder member 25 while being accommodated in the space 25a.

  Then, the rib 3b protruding from the hammer case 3 is fitted between the bifurcated leg portions 25B and 25C of the holder member 25 that holds the chip LED 24 together with the substrate 23, and one leg portion of the holder member 25 is inserted. The screw 26 is passed through the circular hole 25c formed in 25B, and this screw 26 is screwed into the screw hole 3b-1 formed in the rib 3b of the hook case 3, so that the chip LED 24 and the substrate 23 constituting the light 15 are formed. It is attached to the rib 3 b of the hammer case 3 via the holder member 25.

  When the light 15 is attached to the lower part of the front end of the hammer case 3 as described above, the two lead wires 12 extending to the board 23 are formed in the upper and lower two fitting grooves 25d-1 formed in the holding portion 25d of the holder member 25. (Refer to FIG. 9).

  In the above, when working in a dark place such as the attic or under the floor using the impact driver 1, the switch (not shown) is turned on to energize the light 15 from the battery 13 through the substrate 10 and the lead wire 12. Since the illumination light is emitted from the chip LED 24 to the tip tool and the material to be fastened (not shown), the work can be efficiently performed without any trouble.

  Thus, in the impact driver 1 according to the present invention, the holder is attached to the rib 3b that protrudes in front of the trigger 6 at the lower front end of the hammer case 3 and behind the guide sleeve 3a at the tip of the hammer case 3. Since the light 15 is attached via the member 25, the light 15 becomes closer to the tip tool and the tightened material as the illuminated portion, and the illuminated portion can be sufficiently brightly illuminated by the small chip LED 24 with a small capacity. 15 can be reduced in size and size.

  Further, according to the present invention, the small chip LED 24 can be easily attached to the holder member 25 simply by inserting the substrate 23 into the slit-like fitting groove 25b of the holder member 25 from above. The holder member 25 can be easily and reliably attached to the rib 3 b of the hammer case 3 with the screw 26.

  Furthermore, according to the present invention, the two lead wires 12 extending from the substrate 23 inserted into the holder member 25 are inserted into the upper and lower two fitting grooves 25d-1 formed on the side portion of the holding portion 25d of the holder member 25. By fitting each of them, the board 23 is prevented from being lifted off from the holder member 25, so that a fastening member such as a screw for attaching the board 23 to the holder member 25 is not necessary, and the number of parts is reduced and the cost is reduced. Can do.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  10 is an exploded perspective view of the tip of the impact driver according to the present embodiment, FIG. 11 is a perspective view of a hammer case to which a light is attached, and FIG. 12 is an exploded perspective view showing a structure for attaching the light to the hammer case. In these drawings, the same elements as those shown in FIGS. 1 to 9 are denoted by the same reference numerals.

  The present embodiment is characterized in that a holder member 25 that holds the chip LED 24 together with the substrate 23 is attached to the rib 3b of the hammer case 3 by fitting. That is, by simply fitting the rib 3b protruding from the hammer case 3 between the crotch-shaped legs 25B and 25C of the holder member 25 shown in FIG. 12, the holder member 25 can be moved with one touch as shown in FIG. It can be easily attached to the rib 3b.

  And the holder member 25 attached by fitting to the rib 3b of the hammer case 3 as mentioned above is covered and held by the protector 21 shown in FIG. That is, a rectangular box-like bag-shaped portion 21a is integrally projected at the lower portion of the protector 21, and a vertical rib-shaped guide 21b is integrally projected on the inner bottom surface of the bag-shaped portion 21a.

  Thus, when the holder member 25 attached to the rib 3b of the hammer case 3 by fitting into the bag-like portion 21a of the protector 21 is fitted along the guide 21b, the holder member 25 becomes the bag of the protector 21. The lower surface is received and supported by the guide 21b.

  Therefore, in the present embodiment, the same effects as those of the first embodiment can be obtained, and the holder member 25 can be easily attached to the rib 3b of the hammer case 3 by one-touch operation. Can be reliably held by the protector 21, and the effect that the drop-off of the holder member 25 from the rib 3b can be surely prevented is obtained.

  Although the present invention has been described with respect to the embodiment in which the present invention is applied to a cordless impact driver including a rechargeable battery, the present invention can be similarly applied to a corded impact driver. Further, the application of the present invention is not limited only to the impact driver, and it is needless to say that the present invention can be widely applied to other arbitrary electric tools such as a nailing machine.

It is a perspective view of the impact driver which concerns on Embodiment 1 of this invention. It is a right sectional view showing the internal structure of the impact driver according to the first embodiment of the present invention. It is a perspective view which shows the state which removed the protector of the impact driver which concerns on Embodiment 1 of this invention. It is a perspective view of the hammer case to which the light of the impact driver which concerns on Embodiment 1 of this invention was attached. It is a disassembled perspective view which shows the attachment structure to the hammer case of the light in the impact driver which concerns on Embodiment 1 of this invention. It is a figure of the arrow A direction of FIG. It is a figure of the arrow B direction of FIG. It is CC sectional view taken on the line of FIG. It is a perspective view of a holder member. It is a disassembled perspective view of the impact driver front-end | tip part which concerns on Embodiment 2 of this invention. It is a perspective view of the hammer case to which the light of the impact driver which concerns on Embodiment 2 of this invention was attached. It is a disassembled perspective view which shows the attachment structure to the hammer case of the light in the impact driver which concerns on Embodiment 2 of this invention.

Explanation of symbols

1 Impact driver (electric tool)
2 Housing 2A Housing Body 2B Housing Handle 3 Hammer Case 3a Hammer Case Guide Sleeve 3b Hammer Case Rib 3b-1 Screw Hole 4 Motor 4a Motor Output Shaft (Motor Shaft)
5 Planetary gear mechanism (transmission mechanism)
6 Trigger 7 Switch 8 Switch lever 9 Battery receiver 10 Substrate 11, 12 Lead wire 13 Battery 14 FET
15 Light 16 Spindle 16a Spindle cam groove 17 Hammer 17a Hammer cam groove 18 Ball 19 Spring 20 Anvil 21 Protector 21a Protector bag 21b Bag guide 22 Stopper 23 Substrate 24 Chip LED
25 Holder member 25A Holder member body 25B, 25C Holder member leg 25a Holder member storage space 25b Holder member fitting groove 25c Holder member circular hole 25d Holder member holding portion 25d-1 Fitting groove 26 screw

Claims (2)

A housing having a body portion extending in the front-rear direction, a handle portion connected to the body portion, a case attached to the front of the body portion, and a transmission mechanism portion for transmitting rotation of a motor as a drive source; In the electric tool in which a striking mechanism portion that converts rotation transmitted from the transmission mechanism portion into a rotating striking force is housed in the case, and a trigger that controls supply of power to the motor is provided in the handle portion.
A power tool comprising: a light having an LED and a substrate attached to the case; the light and the case covered with a protector; and a lead wire extending from the substrate covered with the protector and the housing . 2. The electric tool according to claim 1, wherein the light is attached inside a holder member made of a transparent resin, and the holder member is attached to a rib provided on the case .

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