JP2008207287A - Power tool system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool system capable of improving the convenience in use of a power tool using a secondary battery as its power supply. <P>SOLUTION: Each time a power tool M is held in the holder H after the end of one job, third and fourth terminals 30 and 31 of the holder H touch first and second terminals 6 and 7 of the battery pack M2 of the power tool M for electrical connection, so that the secondary battery 2 of the battery pack M2 is charged by the charger BC. Therefore, the user need not remove the battery pack M2 from the tool body M1 to charge. Further, the capacity of the secondary battery can be relatively smaller. This can improve the operability of the power tool M and always make the secondary battery 2 be fully charged whenever it is used. The output torque of the power tool M can be stable since the supply voltage is always the same. As the result, this can improve the convenience in use of the power tool M using the secondary battery 2 as the power supply. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric tool system including an electric tool that operates using a secondary battery as a power source, a holder that holds the electric tool when not in use, and a charging device that charges the secondary battery of the electric tool.

Conventionally, electric tools have been used for tightening and loosening screws such as bolts and nuts in various machine assembly factories. In such an electric tool, a battery pack containing a secondary battery as a power source is detachably attached, and when the charge amount of the battery pack decreases, the battery pack is removed and charged by the charging device and then attached again. (For example, refer to Patent Document 1).
JP-A-11-339861

  However, in the above conventional example, in order to charge the secondary battery, it is necessary to remove the battery pack from the electric power tool. For example, if the capacity is increased in order to lengthen the charging cycle (second charging period) of the secondary battery, the power tool becomes larger and the operability is reduced. There is also a problem that the output torque of the electric tool becomes unstable because there is a difference in the output voltage of the secondary battery from when it is near the end.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a power tool system that improves the usability of a power tool that uses a secondary battery as a power source.

  In order to achieve the above object, a power tool that operates using a secondary battery as a power source, a holder that holds the power tool when not in use, and a charging device that charges the secondary battery of the power tool. In the electric tool system, the electric tool includes a body having a built-in driving source such as a motor, a tool body provided integrally with the body and having a gripping part that is gripped by an operator's hand, And a battery pack in which the outer shell is detachably attached to the tool body, and the battery pack is electrically connected to the positive electrode of the secondary battery and exposed to the outside of the outer shell. And a second connection terminal that is electrically connected to the negative electrode of the secondary battery and exposed to the outside of the outer shell, and the holder holds at least the battery pack attached to the power tool. Holder body and holder book And the third connection terminal and the fourth connection terminal that are in contact with each other separately from the first connection terminal and the second connection terminal of the battery pack held in the battery pack, and the charging device is provided in the holder body A charging current is supplied to the first connection terminal and the second connection terminal of the battery pack through the third connection terminal and the fourth connection terminal.

  According to a second aspect of the present invention, in the first aspect of the invention, the battery pack includes a pair of discharge terminals connected to the positive electrode and the negative electrode of the secondary battery, and a pair of connections connected to the positive electrode and the negative electrode of the secondary battery, respectively. And a charging terminal.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the first connection terminal and the second connection terminal are exposed on different surfaces of the outer periphery of the battery pack.

  According to a fourth aspect of the invention, there is provided the door mechanism according to any one of the first to third aspects, wherein the first and second connection terminals are not exposed to the outside without being connected to the third and fourth connection terminals. The battery pack is provided outside the battery pack.

  The invention of claim 5 is the invention of any one of claims 1 to 4, further comprising a blower that blows air toward the electric tool held by the holder body, and the blower is connected to the first and second connections. It is characterized by operating when the terminal and the third and fourth connection terminals are connected separately to blow air.

  According to the first aspect of the present invention, the third and fourth connection terminals provided on the holder and the first and the second provided on the battery pack of the electric tool each time one work is finished and the electric tool is held by the holder. Since the secondary battery of the battery pack attached to the electric tool is charged by the charging device by contact with the second connection terminal, there is no need to remove the battery pack from the tool body and charge the battery pack. The battery capacity can be made relatively small, so that the operability of the power tool can be improved. Furthermore, no matter what time it is used, there is no difference in supply voltage because the secondary battery is just after charging. The output torque can be stabilized. As a result, it is possible to provide a power tool system that improves the usability of a power tool that uses a secondary battery as a power source.

According to the invention of claim 2,
According to the invention of claim 3, it is possible to prevent the first connection terminal and the second connection terminal from being inadvertently short-circuited.

  According to the invention of claim 4, it is possible to prevent the first connection terminal and the second connection terminal from being inadvertently short-circuited.

  According to the invention of claim 5, the electric tool can be cooled by blowing air from the blower while being held by the holder and charging the secondary battery of the battery pack with the charging device. As a result, the motor, the secondary battery, etc. The life of the power tool parts can be extended.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The power tool system of this embodiment includes a power tool M that operates using the secondary battery 2 as a power source, a holder H that holds the power tool M when not in use, and a charging device BC that charges the secondary battery 2 of the power tool M. And the blower F.

  As shown in FIG. 1A, the electric tool M includes a tool body M1 and a battery pack M2 in which a secondary battery 2 is built. The tool body M1 includes a body portion 10 in which the motor 1 is built, a grip portion 11 that is provided integrally with the body portion 10 and is gripped by an operator's hand, and a reduction mechanism (not shown) that protrudes from the tip of the body portion 10. And an output shaft 13 that is driven by the motor 1. The body part 10 is formed in a substantially elliptical truncated cone shape at the front half part and a substantially elliptical columnar shape at the rear half part, and is formed in a substantially prismatic shape from the peripheral surface of the latter part formed in a substantially elliptical columnar shape. The holding part 11 protrudes integrally. In addition, a trigger button 12 that is pulled in with an operator's finger is provided at the base of the grip portion 11.

  As shown in FIG. 1B, the battery pack M2 includes an outer shell 40 including a rectangular parallelepiped main portion 40a and a prismatic connector portion 40b protruding from the center of the upper surface of the main portion 40a. A secondary battery 2 is housed inside. The connector portion 40b is fitted into a fitting recess (not shown) provided in the distal end surface of the grip portion 11 of the tool body M1, and a pair of discharge terminals 41, 41 and a pair of the distal end portions are provided. Charging terminals 42 and 42 are exposed. In addition, a pair of locking pieces 43, 43 having an inward locking claw 43a projecting from the tip portion are provided on the side surface symmetrical with respect to the connector portion 40b in the main portion 40a so as to be movable in the vertical direction. Yes. Further, the side surface on which the locking pieces 43, 43 are provided is electrically connected to the first connection terminal 6 electrically connected to the positive electrode of the secondary battery 2 and the negative electrode of the secondary battery 2. The second connection terminal 7 is exposed.

  The battery pack M2 is mounted on the tool main body M1 in such a manner that the connector portion 40b is fitted into a fitting recess provided on the distal end surface of the gripper 11, and the battery pack M2 is provided on the distal end of the gripper 11. The retaining claws 43a, 43a of the retaining pieces 43, 43 are retained by retaining the retaining holes 43 (not shown). Further, the battery pack M2 can be detached from the tool body M1 by moving the locking pieces 43, 43 downward to release the locking claws 43a, 43a and the locked holes.

  FIG. 2 shows a circuit block diagram of the present embodiment. The tool main body M1 of the electric tool M includes a motor 1, a secondary battery 2, a motor drive circuit 3, a switch unit 4, and a control circuit unit 5. . The control circuit unit 5 includes a microcomputer as a main component, controls the motor driving unit 3 in accordance with the pull-in amount of the trigger button 12, and controls the current supplied from the secondary battery 2 to the motor 1. The number of revolutions is controlled. The switch unit 4 includes a forward / reverse switching switch (not shown) in addition to the trigger button 12 and receives each operation input (for example, the pull-in amount of the trigger button 12 and the state of the forward / reverse switch). Output to the control circuit unit 5. When the forward / reverse switching switch is switched to the reverse side, the control circuit unit 5 reverses the motor 1 by switching the connection direction of the motor driving unit 3 and the motor 1.

  The holder H is formed in a flat rectangular parallelepiped shape as shown in FIG. 1A, and has a holder main body 20 in which a holding recess 21 for storing and holding the grip portion 11 of the electric power tool M and the battery pack M2 is provided on the upper surface. A third connection terminal 30 which is exposed on the inner wall surface of the storage recess 21 and is electrically connected to the first connection terminal 6 and the second connection terminal 7 of the battery pack M2 which is stored and held in the storage recess 21; 4th connection terminal 31 is provided. The holder main body 20 houses the charging device BC and the blower F, and the third connection terminal 30 and the fourth connection terminal 31 are connected to the charging device BC via electric wires 32 and 32, respectively. Further, a detection unit 25 including a proximity switch is provided on the inner wall surface of the storage recess 21. When the gripping unit 11 of the electric tool M and the battery pack M2 are stored and held in the storage recess 21, the detection unit 25 A detection signal is output. Such detection signals are respectively input to the charging device BC and the blower F, and the charging device BC and the blower F operate only when the detection signals are input. The blower F is disposed on the bottom surface side of the storage recess 21 and can blow air into the storage recess 21 through a large number of ventilation holes (not shown) provided on the bottom surface of the storage recess 21.

  Thus, when the battery pack M2 is housed in the housing recess 21 and the electric tool M is held by the holder H, the first and second connection terminals 6 and 7 of the battery pack M2 are connected to the third connection terminal 30 and the third connection terminal 30, respectively. The fourth connection terminal 31 is brought into contact with each other and is conducted, and a detection signal is output from the detection unit 25 to operate the charging device BC, via the first to fourth connection terminals 6, 7, 30, 31. A charging current is supplied from the charging device BC, and the secondary battery 2 of the battery pack M2 attached to the tool body M1 can be charged. At this time, while the electric power tool M is stored in the holder H (while the detection signal is output from the detection unit 25), the blower F operates to blow air into the storage recess 21, so that the battery pack M2 Can be cooled to extend its life. However, if a ventilation port is provided at the bottom of the battery pack M2, the grip 11 front end of the tool body M1, and the rear end of the body part 10 to form an air flow path inside the tool body M1, the battery pack M2 alone is used. The air can be directly applied to the motor 1 or the secondary battery 2 to cool the motor.

  As described above, according to the present embodiment, the third and fourth connection terminals 30 and 31 provided on the holder H and the electric tool M each time one work is finished and the electric tool M is held by the holder H. Since the first and second connection terminals 6 and 7 provided in the battery pack M2 are brought into contact with each other and the secondary battery 2 of the battery pack M2 is charged by the charging device BC, the battery pack M2 is charged for charging. There is no need to remove the tool from the tool body M1, the capacity of the secondary battery 2 can be relatively reduced, the operability of the power tool M is improved, and the secondary battery 2 can be used at any time. Since it is immediately after charging, there is no difference in supply voltage, and the output torque of the electric power tool M can be stabilized. As a result, the usability of the electric power tool M using the secondary battery 2 as a power source is improved. However, since the battery pack M2 has the connector terminal 40b provided with the charging terminals 42, 42, it is possible to charge the battery pack M2 removed from the tool body M1 as usual with a dedicated charger (not shown). It is.

  By the way, in the present embodiment, the first and second connection terminals 6 and 7 are exposed to different surfaces of the outer shell (main portion 40a) of the battery pack M2, thereby preventing an inadvertent short circuit. As shown in a) and (b), there is provided a door structure in which the first and second connection terminals 6 and 7 are accommodated in the main portion 40a and the window hole 40c provided in the bottom surface of the main portion 40a is opened and closed freely. If so, a short circuit accident can be prevented more reliably. Such a door structure pivotally supports two flat door bodies 45, 45 on opposing peripheral portions of the rectangular window hole 40c, and elastically closes the door bodies 45, 45 with a spring (not shown). Energize. On the other hand, in the holder H, the third and fourth connection terminals 30 and 31 are provided at the front end portion of the post portion 21 a protruding from the bottom surface of the storage recess 21. Accordingly, when the battery pack M2 attached to the tool body M1 is inserted into the storage recess 21 of the holder H, the door bodies 45 are pushed by the post portion 21a, so that the door bodies 45 are placed inside the main portion 40a. As a result, the third and fourth connection terminals 30 and 31 provided in the post portion 21a that has entered the main portion 40a through the window hole 40c are opened. The first and second connection terminals 6 and 7 are brought into contact with each other within 40a. Further, when the electric power tool M is taken out from the storage recess 21 of the holder H, the post portion 21a moves out of the main portion 40a and the door bodies 45, 45 are rotated in the opposite direction by the spring force to close the window hole 40c. To do.

(A) is a perspective view which shows embodiment of this invention, (b) is a perspective view of a battery pack. It is a circuit block diagram same as the above. The other structure of a battery pack and a holder in the same as above is shown, (a) is a principal part sectional view before a battery pack is hold | maintained at a holder, (b) is principal part sectional drawing when a battery pack is hold | maintained at a holder. It is.

Explanation of symbols

M electric tool M1 tool main body M2 battery pack H holder BC charging device 1 motor 2 secondary battery 5 control circuit section 6 first connection terminal 7 second connection terminal 20 holder main body 21 storage recess 30 third connection terminal 31 third 4 connection terminals 40

Claims (5)

In an electric tool system comprising an electric tool that operates using a secondary battery as a power source, a holder that holds the electric tool when not in use, and a charging device that charges the secondary battery of the electric tool,
The electric power tool includes a body portion including a drive source such as a motor, a tool body provided integrally with the body portion and gripped by an operator's hand, and the secondary battery incorporated in an outer shell. A battery pack that is detachably attached to the tool body,
The battery pack includes a first connection terminal that is electrically connected to the positive electrode of the secondary battery and exposed outside the outer shell, and a first connection terminal that is electrically connected to the negative electrode of the secondary battery and exposed outside the outer shell. 2 connection terminals,
The holder has at least a holder main body for holding the battery pack mounted on the electric power tool, and a third connection that is brought into contact with the first connection terminal and the second connection terminal of the battery pack held by the holder main body. A terminal and a fourth connection terminal,
The charging device supplies the charging current to the first connection terminal and the second connection terminal of the battery pack via the third connection terminal and the fourth connection terminal provided in the holder body. Tool system.   The battery pack includes a pair of discharge terminals respectively connected to a positive electrode and a negative electrode of a secondary battery, and a pair of charge terminals respectively connected to a positive electrode and a negative electrode of the secondary battery. The electric tool system described.   3. The electric power tool system according to claim 1, wherein the first connection terminal and the second connection terminal are exposed on different surfaces of the outer periphery of the battery pack.   The door mechanism that does not expose the first and second connection terminals to the outside without being connected to the third and fourth connection terminals is provided on the outer periphery of the battery pack. The power tool system according to Item 1. A blower for blowing air toward the electric tool held by the holder body,
The blower device operates and blows air when the first and second connection terminals and the third and fourth connection terminals are separately connected to each other. The power tool system according to item.

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