JP2006205284A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool for securing a long service life, by avoiding even inconvenience of a control circuit board by water, by draining the water intruding in a circuit storage part for internally installing the control circuit board, needless to say to avoid inconvenience by impact, vibration and dust of the control circuit board. <P>SOLUTION: A motor 3 and a driving part 4 rotatingly driven by the motor 3, are stored inside a cylindrical body part 2. A grip part 5 is projected in the direction orthogonal to its cylindrical shaft from the body part 2. This power tool 1 is formed by arranging a battery pack installing part 7 for detachably installing a battery pack 6 on the extension in the projecting direction of the grip part 5 in a tip part in the projecting direction of the grip part 5. The circuit storage part 9 for internally installing the control circuit board 8 for controlling the motor 3, is arranged in the vicinity of the tip part in the projecting direction of the grip part 5. A drain hole 11 for communicating the circuit storage part 9 with the battery pack installing part 7, is arranged on a partition wall 10 arranged in the grip part 5 for separating the circuit storage part 9 from the battery pack installing part 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power tool.

  Conventionally, as shown in FIG. 11, for example, the electric power tool 1 accommodates a motor 3 and a drive unit 4 that is rotationally driven by the motor 3 in a cylindrical main body 2, and the main body 2 extends from the main shaft 2 to the cylindrical shaft. A grip portion 5 is provided so as to project in a direction perpendicular to the grip portion 5, and a battery pack mounting portion 7 for removably attaching the battery pack 6 on the extension of the grip portion 5 in the projecting direction is provided at the tip portion of the grip portion 5 in the projecting direction. It is configured. Such an electric tool 1 is used so that the battery pack 6 is attached to the battery pack mounting portion 7, the power is supplied to the motor 3, and various tools connected to the drive portion 4 are driven to rotate by the output of the motor 3. However, in recent power tools 1, in order to improve the usability, it is generally performed to include a control circuit board 8 that controls the output torque and the rotational speed of the motor 3 in accordance with various tools and construction sites. (For example, see Patent Documents 1 and 2).

  By the way, since this control circuit board 8 is a precision electronic device, it dislikes impact, vibration, dust and water. Therefore, when installing the control circuit board 8 in the electric power tool 1, it is necessary to carefully set the interior location. The main body 2 of the electric power tool 1 has a driving unit 4 built therein, and the driving unit 4 of the electric power tool 1 is one that actively generates vibrations and impacts in order to use a tool such as a hammer drill. In addition, the center of gravity of the electric power tool 1 is in the main body 2 that houses the motor 3 and the drive unit 4, and when the electric power tool 1 is dropped, it falls from the main body 2 having the center of gravity as shown in FIG. (35 in the figure is the ground). Thus, for example, in the electric power tool 1 of FIG. 11, the control circuit board 8 is provided with a circuit storage portion 9 in the vicinity of the front end portion in the protruding direction of the grip portion 5 that is not easily subjected to vibration or impact. Has been. In the figure, reference numeral 26 denotes an operation part for operating the control circuit board 8, and 27 denotes an operation part mounting opening formed in a housing for fitting the operation part 26 therein.

  However, in the electric power tool 1, the motor cooling opening 32 (see FIG. 12) is provided in the housing of the main body 2 in which the motor 3 is housed, and the electric power tool 1 is held by a hand holding the grip 5. Since the trigger switch 15 is positioned between the grip portion 5 and the main body portion 2 in order to perform on / off control, the sliding trigger 15a and the housing are in consideration of wear during sliding. A gap 33 for sliding is formed, and dust and water easily enter the housing from the motor cooling opening 32 and the gap 33. There was a problem that it moved to the tip in the protruding direction and accumulated.

In view of this problem, in the course of reaching the present application, the present inventors, for example, like a power tool of FIG. 11, a circuit-containing space 29 for passing a control wire 28 from the control circuit board 8 to the motor 3 is stored in the circuit. It was conceived that the dust-proof cushioning material 30 was filled in the vacant space 29 for continuous connection to the section 9. According to this dust-proof cushioning material 30, it was possible to obtain a certain effect in preventing dust and water from entering the housing 9 from the motor cooling opening 32 and the gap 33. The joint surface 31 of the housing half (the housing of the electric power tool 1 in FIG. 11 is formed by integrating the housing halves together from the left and right) and the operation portion mounting opening 27 and the operation portion 26. Even the minute gap s that may occur between them will intrude into the housing without mercy, and a sufficient effect can be obtained against water that attempts to enter the circuit housing portion 9 through the minute gap s. It was not a thing. That is, water enters the circuit housing portion 9, and the water that has entered the circuit housing portion 9 stays due to its viscosity and the like, and therefore the control circuit board 8 is corroded or short-circuited. It caused a malfunction. If the amount of water that wets the control circuit board 8 is small, the control circuit board 8 can be made small and inexpensive by performing a simple waterproof process such as waterproof coating. A waterproofing process such as potting must be performed, and the control circuit board 8 becomes larger or costs increase.
JP-A-7-290368 JP-A-9-155755

  The present invention has been invented in view of the above-described conventional problems, and, in addition to avoiding problems due to shock, vibration, and dust of the control circuit board, water that has entered the circuit housing portion that houses the control circuit board. It is an object of the present invention to provide an electric tool that can drain water and ensure a long life by avoiding problems of a control circuit board due to water.

  In order to solve the above problems, an electric tool according to claim 1 of the present invention accommodates a motor 3 and a drive unit 4 that is rotationally driven by the motor 3 in a cylindrical main body 2, and A battery pack mounting portion for projecting the grip portion 5 in a direction perpendicular to the cylinder axis and detachably attaching the battery pack 6 to the tip end portion of the grip portion 5 in the protruding direction of the grip portion 5 The electric power tool 1 is provided with a circuit housing portion 9 including a control circuit board 8 for controlling the motor 3 in the vicinity of the front end portion of the grip portion 5 in the protruding direction, and the circuit housing portion 9 and the battery pack are mounted. The partition wall 10 provided in the grip part 5 that separates the part 7 is provided with a drain hole 11 that allows the circuit storage part 9 and the battery pack mounting part 7 to communicate with each other. According to this, the control circuit board 8 built in the vicinity of the front end of the grip part 5 in the protruding direction is not easily affected by vibrations and shocks caused by the drive part 4 and shocks when the electric power tool 1 is dropped. The trouble of the circuit board 8 can be avoided, and even if water enters the circuit housing portion 9 that houses the control circuit board 8, it can be quickly drained from the drain hole 11, and the control circuit board 8 is corroded by water. In addition, since the drainage hole 11 opens into the battery pack mounting portion 7 to which the battery pack 6 is mounted, the drainage hole 11 is provided with an appropriate gap so that the battery pack is provided with an appropriate gap. 6 is covered, so that dust does not enter the circuit housing portion 9 from the drain hole 11 and the trouble of the control circuit board 8 due to dust can be avoided. That is, it is possible to effectively suppress the occurrence of problems in the control circuit board 8 and to ensure a long life of the power tool 1.

  Further, the electric tool according to claim 2 is the electric tool according to claim 1, wherein when the electric tool 1 is in a vertical posture such that the protruding direction of the grip part 5 from the main body part 2 faces substantially vertically downward. In this case, a downward gradient 12 is formed for allowing water that has entered the circuit housing portion 9 to flow down toward the drain hole 11. According to this, the electric power tool 1 is often used in a vertical posture such that the protruding direction of the grip portion 5 from the main body portion 2 is directed substantially vertically downward. Since the down slope 12 is formed to allow the water that has entered into the drain hole 11 to flow down toward the drain hole 11, when the electric tool 1 is used, the water flowing into the circuit housing portion 9 can be quickly drained along the down slope 12 of the partition wall 10. 11 can be drained, and the occurrence of problems such as a short circuit of the control circuit board 8 due to water can be further suppressed.

  According to a third aspect of the present invention, there is provided a power tool according to the first aspect of the present invention, wherein, in the partition wall 10, the power tool 1 is in a vertical posture such that the protruding direction of the grip portion 5 from the main body portion 2 faces substantially vertically downward. The part which becomes the lower position in the circuit housing part 9 and the part which becomes the lower position in the circuit housing part 9 when the lateral position is such that the protruding direction of the grip part 5 from the main body part 2 is substantially horizontal. In addition, drainage holes 11a and 11b are provided respectively. According to this, even when the electric tool 1 is in a vertical posture such that the protruding direction of the grip part 5 from the main body part 2 is directed substantially vertically downward, the protruding direction of the grip part 5 from the main body part 2 is substantially horizontal. Even in such a horizontal posture, water can be surely drained from the circuit housing portion 9 through the corresponding drain holes 11a and 11b, and problems such as a short circuit of the control circuit board 8 due to water occur. Can be further suppressed.

  According to a fourth aspect of the present invention, when the battery pack 6 in which the cooling vent 13 is formed is mounted on the battery pack mounting portion 7 in the first aspect, the cooling vent 13 and the drain hole 11 are provided. Is characterized by being displaced. According to this, the water drained from the circuit storage part 9 through the drain hole 11 can be prevented from flowing into the cooling vent 13 formed in the battery pack 6, such as a short circuit of the battery pack 6 due to water. Can be avoided.

  The present invention avoids problems caused by shock, vibration and dust of the control circuit board, as well as enables the drainage of water that has entered the circuit housing portion that houses the control circuit board, and causes problems such as a short circuit of the control circuit board due to water. This also has the advantage that the tool life can be extended and the life of the power tool can be extended.Furthermore, it can be used when the power tool is placed in a vertical position that is often used and in a horizontal position that is often placed. Thus, it is possible to drain the water that has entered the circuit storage unit, and to avoid problems such as short circuit to the battery pack due to the water drained from the circuit storage unit.

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

  1 to 3 show examples of embodiments of the present invention. As shown in FIG. 2, the electric tool 1 of the present example includes a substantially T-shaped housing formed by projecting a substantially cylindrical grip portion 5 from a cylindrical main body 2 in a direction substantially orthogonal to the cylinder axis. Have. This housing is integrated with a housing half divided in a direction substantially perpendicular to the cylindrical axis direction of the main body 2 and the protruding direction of the grip part 5 (hereinafter referred to as the width direction of the electric power tool 1). It is formed by making it. Here, as shown in FIG. 1, the main body 2 is provided with a motor 3, a drive unit 4, and a chuck 14 in this order from the base end in the cylinder axis direction to the tip. The motor 3 is rotationally driven by power supply from the battery pack 6 under the control of the control circuit board 8 described later. The drive unit 4 is a transmission mechanism that transmits the rotation output of the motor 3 to the chuck 14 to which various tools are detachably attached. The drive unit 4 applies a shock to the deceleration mechanism that decelerates the rotation of the motor and the cylinder axis direction of the main body unit 2. It consists of an impact mechanism and the like. That is, the electric power tool 1 of this example is an impact rotary tool. Further, the grip portion 5 is a part that is gripped by the user of the electric power tool 1, but in order to facilitate the on / off operation of the electric power tool 1 with the hand holding the grip portion 5, the grip portion 5 is separated from the main body portion 2. A trigger switch 15 for turning on / off the power supply to the motor 3 is provided at a base end portion in the projecting direction (a connecting portion between the grip portion 5 and the main body portion 2). Near the tip of the grip portion 5 in the protruding direction, a flange portion 16 that protrudes in a surface direction substantially orthogonal to the cylinder axis of the grip portion 5 is formed. A battery pack mounting portion 7 to which the battery pack 6 is detachably attached is provided at a distal end side of the flange portion 16 in the protruding direction of the grip portion 5. That is, as shown in FIG. 2, the battery pack 6 is attached to the electric tool 1 so as to be positioned on the extension of the grip portion 5 of the flange portion 16 in the protruding direction.

  Specifically, an insertion recess 17 that is recessed in the direction of the main body 2 is formed on the end surface of the flange portion 16 on the protruding direction side of the grip 5 from the main body 2. The insertion recess 17 includes a shallow recess 17a that is recessed from the end surface of the grip portion 5 in the projecting direction of the grip portion 5 from the main body portion 2 toward the main body portion 2, and a bottom surface of the shallow recess 17a. And a deep recess 17b that is deeply recessed on the main body 2 side. A power supply plug 18 electrically connected to the motor 3 is provided in the deep recess 17b. An engaged portion 19 that engages with the engaging claw 24 of the battery pack 6 is provided in the shallow concave portion 17a.

  Here, as shown in FIG. 4, the battery pack 6 has an insertion base portion 21 and an insertion protrusion 22 protruding substantially vertically upward from the upper surface of the rectangular block-shaped battery main body 20 in which the rechargeable battery is housed. A power supply plug 23 electrically connected to the rechargeable battery is provided at the upper end of the insertion protrusion 22 that protrudes from the insertion base 21. The outer surface of the insertion base 21 engages with the engaged portion 19. An engaging claw 24 is provided. The engaging claw 24 is connected to an attaching / detaching operation button 25 provided on a side surface of the battery body 20 and can be protruded and retracted by operating the attaching / detaching operation button 25. Further, the battery pack 6 may be provided with a cooling vent 13 for air-cooling the rechargeable battery. In the battery pack 6 of FIG. 4, a slit-shaped cooling passage is formed so as to open on the upper surface of the insertion base 21. A pore 13 is provided. In order to mount the battery pack 6 on the battery pack mounting portion 7, the insertion protrusion 22 is inserted into the deep recess 17b to connect the power supply plugs 23 and 18 of the power tool 1 to the shallow recess 17a. This is done by inserting the insertion base portion 21 and hooking and engaging the engaging claw 24 with the engaged portion 19. Specifically, when the battery pack 6 is mounted on the battery pack mounting portion 7, the outer surface shape of the insertion base portion 21 and the insertion protrusion 22 of the battery pack 6 is slightly smaller than the inner surface shape of the insertion recess 17. The ease of mounting is taken into consideration so that the insertion base 21 and the insertion protrusion 22 are not tightly fitted when inserted into the insertion recess 17. When the engaging claw 24 is inserted into the insertion base portion 21 by operating the attachment / detachment operation button 25, the engagement with the engaged portion 19 is released and the battery pack 6 can be removed from the battery pack mounting portion 7. It is like that.

  In addition, a circuit housing portion 9 in which the control circuit board 8 is housed is located in a portion of the flange portion 16 on the proximal end side in the protruding direction of the grip portion 5 and in the same direction as the distal end direction of the main body portion 2. Is formed. That is, the circuit storage portion 9 is provided near the tip of the grip portion 5 in the protruding direction. Specifically, the circuit housing portion 9 is separated from the battery pack mounting portion 7 by the partition wall 10 and is formed in a room shape surrounded by the partition wall 10 and the housing of the flange portion 16. Specifically, the partition wall 10 includes a deep recess lateral wall 10a that forms the bottom surface of the deep recess 17b, a deep recess vertical wall 10b that is connected to the deep recess lateral wall 10a to form a side surface of the deep recess 17b, A shallow concave lateral wall 10c that is continuous from the concave vertical wall 10b and forms the bottom surface of the shallow concave portion 17a; and a shallow concave vertical wall 10d that is continuous from the shallow concave lateral wall 10c and forms the side surface of the shallow concave portion 17a; The horizontal wall 10e for end faces is formed from the vertical wall 10d for shallow recesses and forms the end face of the flange part 16 on the projecting direction side of the grip part 5. Here, the horizontal walls 10a, 10c, 10e face so as to be substantially parallel to the cylinder axis direction of the main body 2 and substantially perpendicular to the protruding direction of the grip part 5, and the vertical walls 10b, 10d are It faces so as to be substantially parallel to the protruding direction of the grip portion 5 and substantially perpendicular to the cylinder axis direction of the main body portion 2. The circuit housing portion 9 is formed by being surrounded by the housing of the flange portion 16 and the vertical wall 10b for the deep recess, the horizontal wall 10c for the shallow recess, the vertical wall 10d for the shallow recess, and the horizontal wall 10e for the end surface. The control circuit board 8 accommodated in the circuit accommodating portion 9 is arranged so as to be along the shallow concave lateral wall 10c with a gap. In this way, the control circuit board 8 is disposed in the vicinity of the tip of the grip part 5, that is, the control circuit board 8 is equipped with the motor 3 and the drive unit 4 that generate vibrations and impacts and has a center of gravity. Thus, when the electric power tool 1 is dropped, it is disposed as far as possible from the main body portion 2 that is easily subjected to the impact of the drop, and the occurrence of the malfunction of the control circuit board 8 due to vibration and impact is prevented (see FIG. 12).

  The housing of the flange portion 16 above the control circuit board 8 is formed with an operating portion mounting opening 27 and is fitted into the operating portion mounting opening 27 so that the operating portion 26 for operating the control circuit board 8 faces outward. Installed. Further, the circuit housing portion 9 has a passage for passing a control electric wire 28 extending from the control circuit board 8 to the motor 3 formed by being surrounded by the housing of the grip portion 5 and the vertical wall 10b for the deep recess. A line space 29 is continuously provided. In this example, a dustproof cushion material 30 is provided in the through space 29 so as to close the through space 29 while passing the control electric wire 28 therethrough. According to the dustproof cushion material 30, dust enters the grip portion 5 through the gap 33 between the motor cooling opening 32 formed in the housing of the main body portion 2 and the trigger switch 15, and the grip portion 5 protrudes due to gravity. Even if it falls to the tip in the direction, this dust is prevented from entering the circuit housing portion 9, and the trouble of the control circuit board 8 due to the dust is avoided.

  By the way, as described in the background art, the control circuit board 8 which is a precision electronic device is weak because it has a problem of malfunction due to corrosion or short circuiting against water as well as vibration and dust. is there. Here, water also enters the electric tool 1 from the motor cooling opening 32 through which the dust enters the electric tool 1 and the gap 33 between the trigger 15a of the trigger switch 15 and the housing, and the dust-proof cushion material 30 Water can be absorbed and held to some extent, and the amount of water can be prevented from entering the circuit housing portion 9. However, when the amount of water absorbed and held by the dustproof cushion material 30 exceeds a certain level, more water is stored in the dustproof cushion material 30. Oozes out from the circuit housing portion 9. Further, in the minute gap s formed between the operation unit 26 and the operation unit mounting opening 27 or on the joint surface 31 of the housing half, dust does not pass through, but water having finer particles than dust enters the circuit storage unit 9. I will let you. The water that has entered the circuit storage unit 9 remains in the circuit storage unit 9 due to the relationship between viscosity and atmospheric pressure. If the water remaining in the circuit storage unit 9 immerses the control circuit board 8 over a long period of time, the control circuit If the substrate 8 is subjected to a simple waterproofing treatment such as coating, the control circuit board 8 will be defective due to water. The present invention drains water that has entered the circuit housing portion 9 in which the control circuit board 8 is housed in order to avoid problems of the control circuit board 8 due to water as well as problems of the control circuit board 8 due to dust and vibration. This is what we made possible. Details will be described below.

  That is, the partition wall 10 that separates the circuit housing portion 9 and the battery pack mounting portion 7 in the grip portion 5 is provided with a drain hole 11 that allows the circuit housing portion 9 and the battery pack mounting portion 7 to communicate with each other. Specifically, in this example, as shown in FIGS. 1 and 3, the drain hole 11 a is formed in the end face lateral wall 10 e of the partition wall 10. The electric power tool 1 is often used in a vertical posture in which the protruding direction of the grip portion 5 from the main body 2 is substantially vertically downward. When the electric power tool 1 is in the vertical posture, the side wall 10e for the end face of the partition wall 10 is Therefore, the water that has entered the circuit housing portion 9 that houses the control circuit board 8 is located at the lowermost end portion of the circuit housing portion 9. Thus, the drainage hole 11a drilled in the side wall 10e for the end face can be quickly drained to the battery pack mounting portion 7, that is, the water that has entered the circuit storage portion 9 does not collect in the circuit storage portion 9 and is stored in the control circuit. The substrate 8 is drained immediately before the substrate 8 is wetted, and problems such as a short circuit of the control circuit substrate 8 due to water are avoided. The drain hole 11a is open to the battery pack mounting portion 7 to which the battery pack 6 is mounted. In other words, the opening on the battery pack 6 side of the drain hole 11a is the battery pack 6 mounted to the battery pack mounting portion 7. Since it covers with a moderate gap for ensuring the ease of mounting, dust does not enter the circuit housing portion 9 from the drain hole 11a, and avoidance of problems of the control circuit board 8 due to dust is also ensured. Yes. In this way, the occurrence of problems in the control circuit board 8 can be effectively suppressed, and the life extension of the electric power tool 1 is ensured.

  Further, the battery pack 6 used in this example is provided with the cooling vents 13, but when the battery pack 6 is mounted on the battery pack mounting portion 7, the drain holes 11a and the cooling vents 13 are displaced. It has a positional relationship, and the water drained from the circuit housing portion 9 through the drain hole 11 a is prevented from flowing into the cooling vent 13 formed in the battery pack 6. Furthermore, the opening of the drainage hole 11a on the battery pack mounting portion 7 side is directed to the upper surface of the battery main body portion 20 that is one step lower than the upper surface of the insertion base portion 21 where the cooling vent 13 in the battery pack 6 is opened. The water drained from the circuit housing portion 9 to the battery pack mounting portion 7 can be easily drained to the outside through the battery body portion 20 as it is, and the upper surface of the insertion base portion 21 is The inflow of water into the cooling vent 13 is also avoided. Thus, problems such as a short circuit of the battery pack 6 due to the water drained from the circuit housing portion 9 are effectively avoided.

  Hereinafter, other examples of the embodiment of the present invention will be listed. In these examples, a part of the example of the previous embodiment is changed, and the remaining part has the same configuration. Therefore, the same reference numerals are given to the parts having the same configuration as the example of the previous embodiment. A description thereof will be omitted, and different parts from the previous embodiment will be described.

  FIG. 5 shows another example of the embodiment of the present invention. In this example, when the electric power tool 1 is in a vertical posture, the partition wall 10 is provided with a downward gradient 12 toward the drain hole 11. More specifically, a downward slope 12 is formed on the shallow recess lateral wall 10c of the partition wall 10 so as to be directed downward toward the drainage hole 11a formed in the end surface lateral wall 10e. Specifically, the descending slope 12 is inclined with an inclination angle inclined toward the drainage hole 11 side with respect to a plane orthogonal to the protruding direction of the grip part 5 and parallel to the cylinder axis direction of the main body part 2. Surface. The electric power tool 1 is often used in a vertical posture such that the protruding direction of the grip portion 5 from the main body portion 2 is directed substantially vertically downward. At this time, water that has entered the circuit housing portion 9 has entered the partition wall 10. Is formed so that the water flowing into the circuit housing portion 9 is quickly drained from the drain hole 11 along the downward slope 12 of the partition wall 10 when the electric power tool 1 is used. Thus, the occurrence of problems such as a short circuit of the control circuit board 8 due to water can be further suppressed. In addition, the downward slope 12 is formed on the shallow concave lateral wall 10c along which the control circuit board 8 is provided, particularly on the shallow concave lateral wall 10c where water flowing along the partition wall 10 is likely to immerse the control circuit board 8. This is intended to prevent water accumulation and further suppress the occurrence of problems such as a short circuit of the control circuit board 8 due to water.

  6 to 9 show still another example of the embodiment of the present invention. In this example, the drainage hole 11 that communicates between the circuit housing portion 9 and the battery pack mounting portion 7 is formed with the partition wall 10 that becomes the lowermost end portion of the circuit housing portion 9 when the electric power tool 1 is in the vertical position as in the previous example. In addition to the drain hole 11a provided in the end wall 10e, when the electric tool 1 is placed in a horizontal posture so that the protruding direction of the grip part 5 from the main body part 2 is substantially horizontal, This is an example in which drain holes 11b are also provided in both widths of the power tool 1 in the lateral wall 10c. Here, the electric power tool 1 is often placed on the mounting surface 34 such as the ground in a lateral posture such that the protruding direction of the grip portion 5 from the main body 2 is substantially horizontal as shown in FIG. For example, as shown in FIG. 10, in the case where the drainage hole 11 is drilled in the center in the width direction of the electric power tool 1 in the shallow concave side wall 10c, the electric power tool 1 is placed in the horizontal posture by placing it on the mounting surface 34 or the like. The water draft that has entered the circuit housing portion 9 may not reach the drain hole 11a and is not discharged to the outside, but is accumulated in the circuit housing portion 9, but as shown in this example, In the case where the drainage holes 11b are provided in the widthwise width of the electric tool 1 in the horizontal wall 10c, water that has entered the circuit housing portion 9 even when the electric tool 1 is placed in a horizontal posture by placing it on the mounting surface 34 or the like. Can be drained from the drainage hole 11b to the rechargeable battery pack mounting portion 7, and the occurrence of problems such as a short circuit of the control circuit board 8 due to water can be further suppressed.

  More specifically, according to the provision of the drainage holes 11b in the widthwise width of the electric power tool 1 in the shallow recessed lateral wall 10c, when the electric tool 1 is in the horizontal position, the circuit housing portion 9 is formed by the single drainage hole 11b. The drainage hole 11b can function to allow the air to flow into the circuit housing portion 9 and can drain water from the circuit housing portion 9 quickly. Also, by providing a plurality of drain holes 11 (11a, 11b), the drainage function can be actuated by the separate drainage holes 11, and the air inflow function to the circuit housing portion 9 can be actuated. As described above, there is an advantage that water can be quickly drained from the circuit housing portion 9, or the air flow in the circuit housing portion 9 can be made good and water remaining in the circuit housing portion 9 due to viscosity or the like can be efficiently dried.

  In this example as well, the battery pack 6 is provided with a slit-shaped cooling vent 13 opened on the upper surface of the insertion base 21 as shown in FIG. 4, and FIG. 9 shows this battery pack. 6 shows a state where 6 is attached to the battery pack mounting portion 7. Here, the shallow recess 17a formed by the shallow recess lateral wall 10c is sufficiently larger than the insertion base 21 of the battery pack 6 inserted into the shallow recess 17a, and the electric tool 1 in the shallow recess lateral wall 10c is formed. The opening on the battery pack mounting part 7 side of the drain holes 11b provided at both ends in the width direction of the battery body 6 of the battery pack 6 mounted on the battery pack mounting part 7 is the same as the drain hole 11a provided in the side wall 10e for the end face. The water is opened toward the upper surface, and the water drained from the circuit housing portion 9 to the battery pack mounting portion 7 can be easily drained to the outside through the battery main body portion 20 as it is. Therefore, each drain hole 11a, 11b has a positional relationship shifted from the cooling vent 13, and is formed on the upper surface of the battery body 20 that is one step lower than the upper surface of the insertion base 21 where the cooling vent 13 opens. Therefore, the water drained from the circuit storage part 9 through the drain holes 11a and 11b directly flows into the cooling vent 13 formed in the battery pack 6 or the insertion base part 21. Inflow of water into the cooling vent 13 through the upper surface of the battery is also avoided, and the water drained from the circuit housing portion 9 through the drain holes 11a and 11b is formed in the battery pack 6 for cooling. Thus, the battery pack 6 can be prevented from flowing into the vent hole 13, and problems such as a short circuit of the battery pack 6 due to water can be avoided. In addition, although the dustproof cushion material 30 is not provided in the power tool 1 of other examples of embodiment of this invention, it cannot be overemphasized that the dustproof cushion material 30 may be employ | adopted for these power tools 1.

It is a sectional side view of the electric tool of the example of an embodiment of the invention. It is a perspective view of the electric tool in a vertical posture state same as the above. It is a perspective view of the battery pack mounting part in an electric tool same as the above. It is a perspective view of the battery pack used with the electric tool same as the above. It is a sectional side view of the electric tool of the other example of embodiment of this invention. It is a perspective view of the battery pack mounting part in the electric tool of the further another example of embodiment of this invention. It is a horizontal sectional view in a flange part of an electric tool same as the above. It is a front view of the state which mounted the electric tool same as the above in a horizontal posture on the mounting surface. It is side sectional drawing of the electric tool of the state which attached the battery pack same as the above. It is sectional drawing in the flange part which made the electric power tool as a comparative example into horizontal posture. It is a sectional side view of the electric tool of the example of background art. It is a side view of the state where the electric tool fell and landed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric tool 2 Main body part 3 Motor 4 Drive part 5 Grip part 6 Battery pack 7 Battery pack mounting part 8 Control circuit board 9 Circuit storage part 10 Partition 11 Drain hole 11a Drain hole 11b Drain hole 12 Down slope 13 Cooling vent

Claims (4)

  A motor and a drive unit that is rotationally driven by the motor are accommodated inside the cylindrical main body, and a grip portion is protruded from the main body in a direction perpendicular to the cylinder axis. A battery pack mounting portion for detachably mounting the battery pack on the extension of the grip portion in the protruding direction of the grip portion, and a control circuit board for controlling the motor in the vicinity of the tip portion of the grip portion in the protruding direction. An electric circuit characterized in that an internal circuit storage unit is provided, and a drainage hole that communicates the circuit storage unit and the battery pack mounting part is provided in a partition wall provided in a grip part separating the circuit storage unit and the battery pack mounting part. tool.   A downward slope is formed in the partition wall to allow the water that has entered the circuit storage portion to flow down toward the drainage hole when the electric tool is in a vertical posture such that the protruding direction of the grip portion from the main body portion is substantially vertically downward. The power tool according to claim 1.   In the partition wall, when the electric tool is in a vertical posture such that the protruding direction of the grip portion from the main body portion is substantially vertical, the portion that is the lower position in the circuit storage portion and the protrusion of the grip portion from the main body portion 2. The power tool according to claim 1, wherein drainage holes are respectively provided in the lower portions of the circuit storage portion when the horizontal posture is set such that the direction is substantially horizontal.   2. The electric power tool according to claim 1, wherein when the battery pack having the cooling vent hole is mounted on the battery pack mounting portion, the cooling vent hole and the drain hole are shifted from each other.

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