JP2008000835A - Portable electric tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment structure for a battery pack in which the battery back 9 is firmly fixed to a battery pack accepting section 4 provided in a handle housing section 3, and the weight of the battery pack accepting section 4 is reduced in a portable electric tool 1. <P>SOLUTION: The battery pack accepting section 4 of the electric tool 1 is structured of a cabinet forming a battery storing chamber for storing the battery pack 9, and at least one inserting slot 4f1 (or 4f2) for inserting the battery pack 9 is opened in the front surface of the cabinet 4. The battery pack 9 is inserted while being slid along the inner face of the cabinet 4 from the inserting slot 4f1 or 4f2 to be attached in the cabinet 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable power tool that uses a battery pack such as a driver drill or impact tool as a power source, and more particularly, to a structure of a battery pack receiving portion for mounting the battery pack to an end portion of a handle housing portion.

  In general, in a portable electric tool that uses a battery pack as a driving power source, it is connected to a body housing part that houses a motor part and a power transmission mechanism part, and is perpendicular to the extending direction of the body housing part or an angle from the vertical direction. A handle housing portion extending in the direction of holding the battery pack is provided, and a battery pack receiving portion for mounting the battery pack is provided at the tip of the handle housing portion. In this case, as a typical connection method for attaching the battery pack to the battery pack receiving portion, as disclosed in Patent Document 1 below, the battery pack is arranged along the guide rail provided in the battery pack receiving portion. A so-called slide connection method is known in which a guide rail receiving portion is slid and connected.

  The slide connection method has the advantage that the battery pack can be fixed to the guide rail without loosening and is not easily dropped, and the battery pack is not mounted in the handle housing part of the portable power tool body, so the handle housing part is made thin. Therefore, there is an advantage that it is easy to grip and can have a cross-sectional shape suitable for operability or workability.

JP 2002-358842 A

  However, in the conventional portable electric tool as disclosed in Patent Document 1, the connecting portion of the slide connection type battery pack has a strength that can withstand intense movement and vibration during work, so that the guide rail is made as long as possible. In addition, it is required to be formed thick, and as a result, there is a problem in that the weight of the portable power tool is increased and the operability or workability is lowered.

  Furthermore, portable power tools are required depending on the work location or work content, such as a light weight type is required for work in high places or narrow places on the work site, and a high current capacity type is required for continuous work. Specifications may vary. In order to satisfy different required specifications, it is preferable to prepare a plurality of types of portable power tools, but this is economically disadvantageous. If a plurality of types of battery packs are prepared, the weight and current capacity of the portable power tool can be changed, but this is also disadvantageous economically.

  Accordingly, an object of the present invention is to provide a portable electric tool having a battery pack mounting structure capable of firmly fixing a battery pack to a battery receiving portion provided in a handle housing portion.

  Another object of the present invention is to provide a portable power tool having a battery pack mounting structure in which the weight of a battery pack and a battery receiving portion for mounting the battery pack is reduced.

  Still another object of the present invention is to provide a portable electric tool having a battery pack mounting structure in which a desired number of battery packs that can be mounted on a tool body can be selected.

  Still another object of the present invention is to provide a portable electric tool having a battery pack mounting structure that has good operability and good economic efficiency.

  In order to achieve the above object, the outline of typical ones of the inventions disclosed in the present application will be described as follows.

  According to one aspect of the portable electric tool of the present invention, the fuselage housing portion that extends in one direction and accommodates the motor portion and the power transmission portion that drives the tip tool, and is connected to the fuselage housing portion, the fuselage housing A handle housing portion extending in a direction perpendicular to or extending from the vertical direction with respect to the extending direction of the portion, and a battery pack receiving portion provided at a tip portion of the handle housing portion, to which the battery pack is attached And a battery pack receiving unit electrically connected to the motor unit as a drive power source, the battery pack receiving unit having a cabinet forming a battery storage chamber for storing the battery pack. In addition, at least one insertion port for inserting the battery pack is provided on a side surface of the cabinet, and the battery pack is inserted through the insertion port. Inserting while sliding along the click on the inner surface of the cabinet.

  According to another characteristic of the portable power tool of the present invention, the side surface of the cabinet has a plurality of insertion holes for inserting a plurality of battery packs, and the inner surface of the cabinet has the plurality of insertion holes. Connection terminals for electrically connecting the battery packs inserted correspondingly to each other in parallel.

  According to still another feature of the portable power tool of the present invention, a partition wall that partitions the battery storage chamber into a plurality of storage chambers and a plurality of insertion ports is disposed on the inner surface of the cabinet.

  According to still another aspect of the portable power tool of the present invention, at least a part of the outer peripheral surface of the battery pack is inserted in the battery pack insertion direction from the insertion port into the battery housing chamber of the cabinet. An extending convex portion or concave portion is formed, and an inner surface of the cabinet is provided with a concave portion or convex portion slidably formed in the convex portion or concave portion of the battery pack.

  According to still another feature of the portable power tool of the present invention, the plurality of battery packs have the same shape as each other, and each battery pack contains a plurality of battery cells.

  According to still another feature of the portable power tool of the present invention, when the battery pack is mounted on the cabinet, the battery pack includes an insertion portion inscribed in the battery housing chamber of the cabinet, and the insertion port of the cabinet. And a lid portion exposed from the insertion port.

  According to still another aspect of the portable power tool of the present invention, the battery pack includes a retaining piece that can be engaged with a side surface of the cabinet when the battery pack is mounted on the cabinet.

  According to still another aspect of the portable power tool of the present invention, the cabinet is stacked in the extending direction of the handle housing part and is partitioned by the partition part and includes a plurality of stages of battery housing chambers and a plurality of stages of battery storage chambers. The battery pack having the insertion opening and inserted into each insertion opening is slidably inserted in the extending direction of the body housing portion.

  According to still another aspect of the portable power tool of the present invention, the motor unit is configured to be operable by the battery pack inserted into at least one of the plurality of insertion ports of the cabinet.

  According to the present invention, the battery pack receiving portion has a cabinet forming a battery housing chamber for housing the battery pack, and is inserted and mounted while sliding the battery pack along the inner surface of the cabinet from the insertion port. Therefore, the battery pack can be firmly fixed. Further, since the battery pack is slid in a cabinet shape, it is not necessary to provide a heavy guide rail as in the conventional slide connection method, and the weight of the portable power tool can be suppressed.

  According to the present invention, since the cabinet as the battery pack receiving part has a plurality of battery pack insertion slots, by connecting only one battery pack in a limited work at a high place or a narrow place in the work site, The weight of the tool can be reduced. On the other hand, in continuous work, a plurality of (for example, two) battery packs can be connected in parallel to provide a power source with a high current capacity. Therefore, the use corresponding to the work place and the work content can be performed by one portable electric tool.

  According to the present invention, since the cabinet has a multistage battery pack insertion slot, when connecting one battery pack, the center of gravity position of the portable power tool is changed according to the work contents by changing the insertion position into the cabinet. Can be changed.

  According to the present invention, since the partition part (partition part) for partitioning the battery storage chamber of the cabinet into the plurality of storage chambers and the plurality of insertion ports is disposed, the strength of the battery pack receiving part can be increased. Even if the portable electric tool is dropped, it can be made difficult to be damaged.

  According to the present invention, since the concave and convex portions that contact each other are formed particularly on the inner surface of the cabinet and the outer surface of the battery pack, the battery pack can be smoothly inserted into the cabinet (sliding insertion). In addition, backlash in the battery pack insertion direction (left-right direction) can be suppressed and the battery pack can be firmly fixed.

  The above and other objects of the present invention, and the above and other features of the present invention will become more apparent from the following description of the present specification and the accompanying drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted.

  1 is an external view (front view) of an entire tool in which a portable electric tool according to the present invention is applied to an impact driver, FIG. 2 is a rear view of the impact driver shown in FIG. 1, and FIG. 3 is an impact driver shown in FIG. 4 is a cross-sectional view taken along the line AA of the external view of the impact driver shown in FIG. 1, and FIG. 5 is a partial cross-sectional view taken along the line BB of the external view of the impact driver shown in FIG. 6 is a partial cross-sectional view taken along the line CC of the outline drawing of the impact driver shown in FIG. 4, and FIG. 7 is a diagram showing one battery pack in the lower cabinet (battery pack holder) in the impact driver according to the present invention shown in FIG. FIG. 8 shows an external view when one battery pack is attached to the upper cabinet (battery pack receiving portion) in the impact driver according to the present invention shown in FIG. Show is.

  Initially, the structure of the whole tool of an impact driver is demonstrated with reference to FIG.1, FIG2 and FIG.3.

  As shown in FIG. 1 and FIG. 2, the impact driver (electric tool) 1 according to the embodiment of the present invention has a rotation axis direction (XX direction) (hereinafter referred to as a horizontal direction) of a motor unit (not shown). The body housing portion 2 extending along the direction (the direction), and a direction perpendicular to the extending direction (XX direction) of the body housing portion 2 (X-X direction) or a certain angle θ from the vertical direction. The handle housing part 3 is connected to and extends in the holding direction (Z-Z direction), and a cabinet (housing) 4 provided at the tip of the handle housing part 3 and functioning as a battery pack receiving part. The

  The fuselage housing portion 2 is a DC motor and an output shaft of the DC motor (not shown) from the right end side to the left end side in the extending direction (XX horizontal direction) of the fuselage housing portion 2. A pinion, a speed reduction mechanism including a planetary gear that engages with the pinion, a spindle that transmits a rotational force from the speed reduction mechanism, a hammer mechanism formed on the outer peripheral surface of the spindle, and a hammer mechanism A rotating anvil is sequentially accommodated, and a mounting tool 2a for detachably mounting a tip tool (not shown) such as a drill is provided at the tip of the anvil, and the tip tool such as a drill is disposed on the left end side. Installed.

  The impact driver 1 supplies power to a DC motor housed in the body housing portion 2 from a battery pack 9 attached to a battery pack receiving portion 4 described later via a trigger switch 5. A DC motor is driven to rotate by an ON operation, and the rotational power is transmitted as a rotational impact force to the tip tool attached to the fixture 2a via the power transmission part in the body housing part 2 as shown in FIG. On the other hand, a fastener such as a screw is screwed.

  The cabinet 4 that forms the battery pack receiving portion includes an upper wall 4a, a bottom wall 4b, a left wall 4c, a right wall 4d, and a back wall 4e that form a battery housing chamber that houses the battery pack 9. The front surface (opening portion) of the cabinet 4 forms an insertion port 4f (4f1, 4f2) opened from the wall portion. The battery pack 9 is inserted while sliding (sliding) from the insertion opening 4f into the battery housing chamber formed by the cabinet 4.

  According to the present embodiment, the partition wall portion 7 is formed between the top wall portion 4 a and the bottom wall portion 4 b of the cabinet 4, and the battery storage chamber in which the battery pack 9 is stored by the partition wall portion 7 is vertically mirror-symmetrical. The two battery packs 9 can be inserted mirror-symmetrically through the insertion openings 4f1 and 4f2 at each stage. In the case of this embodiment, the battery housing chamber is divided into two upper and lower stages in the vertical direction (Y-Y direction). May be divided. Furthermore, if the total weight of the battery pack to be mounted is within an allowable range, it may be configured such that two or more battery packs can be mounted by providing insertion openings in a matrix form in the horizontal and vertical directions.

  According to the present invention, the battery pack 9 is inserted into the cabinet 4 by using the outer peripheral surface of the battery pack 9 as the inner peripheral surface of the cabinet 4 (top wall portion 4a, bottom wall portion 4b, left side wall portion 4c, right side wall portion. 4d and the inner surface of the back wall portion 4e) are inserted while being slid so as to contact or contact. Thereby, rattling between the battery pack 9 and the cabinet 4 can be prevented and the battery pack 9 can be firmly fixed in the cabinet 4. Furthermore, in order to fix more firmly, each inner wall surface of the upper surface wall part 4a and the bottom wall part 4b of the cabinet 4 is provided with the recessed part 15 extended in the front-back direction (XX direction), respectively, On the upper outer surface of the insertion portion 9a, a convex portion 16 that abuts on the groove portion of the concave portion 15 of the cabinet 4 is formed.

  Further, as shown in FIG. 4, the latch portion (engagement portion) 10 provided on the side surface portion of the battery pack 9 is engaged with each front end portion of the left side wall portion 4 c and the right side wall portion 4 d of the cabinet 4. When a pair of holes (engagement piece receiving windows) 6 for inserting the piece (retaining claw portion) 11 is formed and the insertion portion 9a of the battery pack 9 is completely inserted into the battery housing chamber of the cabinet 4, The engagement piece 11 of the battery pack 9 engages with the engagement piece receiving window 6 of the cabinet 4, and the battery pack 9 is latched by the cabinet 4 and mounted in the cabinet 4.

  As shown in FIG. 4, a pair of connection terminals 8 electrically connected to the trigger switch 5 are attached to the inner surface of the back wall 4 e of the cabinet 4, and the battery pack 9 is completely inserted into the cabinet 9. In this case, the pair of power supply terminals 13 of the battery pack 9 are electrically connected to the pair of connection terminals 8 of the cabinet 4.

  As shown in FIG. 5, five battery cells 12 are housed in each battery pack 9 and are electrically connected in series with each other. For example, one battery pack 9 contains five lithium ion battery cells 12 having a voltage of 3.6 V and a current capacity of 1.5 Ah, and one battery pack 9 has a voltage of 18 V and a current capacity of 1. It is configured to be 5 Ah. As shown in this embodiment, when two battery packs 9 are used and are electrically connected in parallel within the cabinet 4, the impact driver 1 has a power supply specification with a voltage of 18V and a current capacity of 3Ah. Further, as shown in FIG. 7 or FIG. 8, when one battery pack 9 is mounted in the cabinet 4, the impact driver 1 can have a power supply specification with a voltage of 18 V and a current capacity of 1.5 Ah. In this case, unlike the conventional battery pack insertion type, there is no need to insert a battery pack in the handle housing portion 3, so the thickness of the handle housing portion 3 (the length of the waistline) is the number of battery packs installed. Regardless of the size, the size can be designed to be easily grasped by the palm. Therefore, the user of the tool can select the current capacity of the impact driver 1 according to the work site or the work content, and can improve the operability or workability of the tool.

  The two battery packs 9 have the same external shape and are symmetrical. As shown in FIG. 4, each battery pack 9 includes an insertion portion 9 a that is inscribed in the cabinet 4 and a lid portion (exposed portion) 9 b that is exposed from the insertion port (front surface) 4 f of the cabinet 4. . In the case of this embodiment, in the insertion direction of the battery pack 9, the length of about 2/3 forms the insertion portion 9a, and the remaining length of about 1/3 forms the lid portion 9b. The battery pack 9 has a latch portion 10 made of an elastic material on both sides of the lid portion (exposed portion) 9b, and an engagement piece (claw portion) 11 is provided at the end of the latch portion 10. It has been. As shown in FIG. 4, the latch portion 10 is formed so as to be bent with respect to a transverse press across the central axis XX. As described above, when the insertion portion 9a of the battery pack 9 is completely inserted into the battery housing chamber of the cabinet 4, the engagement piece 11 of the battery pack 9 engages with the engagement piece receiving window 6 of the cabinet 4, The battery pack 9 can be mounted so as not to drop out of the cabinet 4. In addition, since the insertion opening 4f of the cabinet 4 is closed by the lid portion 9b of the battery pack 9, entry of dust such as cutting waste into the cabinet 4 can be prevented.

  Next, a method of mounting on the cabinet (battery pack receiving part) 4 of the impact driver main body 1 will be described.

  The concave portion 15 provided on the inner surface of the upper surface wall portion 4 a of the cabinet 4 is aligned with the convex portion 16 provided on the outer surface of the upper surface wall portion 9 a of the battery pack 9, and the battery pack 9 is slid on the inner surface of the cabinet 4. Then, it can be easily inserted into the cabinet 4. When the insertion portion 9a of the battery pack 9 is completely inserted, the power supply terminal 13 of the battery pack 9 is brought into contact with and electrically connected to the connection terminal 8 disposed on the back wall portion 4e in the cabinet 4. The power supply terminal 13 of the inserted battery pack 9 contacts the connection terminal 8 of the cabinet 4, and the engagement piece (claw portion) 11 of the latch portion 10 of the battery pack 9 is formed in the engagement piece receiving window 6 of the cabinet 4. The battery pack 9 is fixed at a predetermined position in the cabinet 4 by being hooked. On the other hand, when removing the battery pack 9 from the cabinet 4 of the impact driver 1, the battery pack 9 is slid forward of the insertion openings 4f1 and 4f2 while the latch portion 10 is pressed toward the center in the transverse direction of the battery pack 9. By pulling out while moving, it can be easily removed from the cabinet 4.

  According to the present embodiment, as shown in FIG. 1, two battery packs 9 can be attached to the upper and lower stages of the cabinet 4 to operate the electric tool. Moreover, as shown in FIG. 7 or FIG. 8, one battery pack 9 can be attached to one of the upper and lower two insertion ports 4f1, 4f2 to operate the electric tool. As a result, two battery packs 9 are used in continuous work where high capacity is required, and one battery pack 9 is used in work in high places and narrow places where weight reduction is required. Flexible usage is possible.

  Further, as shown in FIG. 8, when one battery pack 9 is inserted into the upper insertion port 4f1 of the cabinet 4, the center of gravity 14 moves upward, so that the body housing portion 2 can be easily moved. On the other hand, as shown in FIG. 7, when one battery pack 9 is inserted into the lower insertion port 4 f 2 of the cabinet 4, the center of gravity 14 moves downward, so that the body housing portion 2 is more stable. Therefore, the mounting position of the battery pack 9 can be changed depending on the work site or the work content.

  Furthermore, according to the present invention, the inner peripheral surface of the cabinet 4 and the outer peripheral surface of the battery pack 9 are contacted or joined by the concave portion 15 and the convex portion 16, so that the battery pack 9 attached to the cabinet 4 The backlash can be minimized.

  In addition, in the said embodiment, although the insertion port 4f of the cabinet 4 was provided in the front surface of a horizontal direction (XX direction), ie, the side in which a front-end tool is attached, the other side surface, ie, the back wall part 4e of the said embodiment. The insertion port 4f may be formed so as to be inserted from the side or the left and right side wall portions 4c, 4d. In this case, considering the workability for inserting the battery pack 9 into the cabinet 4 or pulling it out of the cabinet 4, the insertion port 4f is provided on the front surface in the horizontal direction (XX direction) as in the above embodiment. Is more advantageous.

  Moreover, although the said embodiment demonstrated the case where this invention was applied to an impact driver, this invention is applied to the various portable electric tools which use battery packs, such as a wrench, a hammer, a circular saw, a cutter, and a saver saw, as a power supply. Can do.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. It is.

1 is an external view (front view) of an impact driver according to an embodiment of the present invention. The rear view of the impact driver shown in FIG. The bottom view of the impact driver shown in FIG. Sectional drawing which follows the AA line of the external view of the impact driver shown in FIG. The fragmentary sectional view which follows the BB line of the external view of the impact driver shown in FIG. The fragmentary sectional view which follows the CC line of the external view of the impact driver shown in FIG. FIG. 2 is an external view when one battery pack is attached to the lower cabinet in the impact driver shown in FIG. 1. FIG. 2 is an external view of the impact driver shown in FIG. 1 when one battery pack is attached to the upper cabinet.

Explanation of symbols

1: Impact driver (portable electric tool) 2: Body housing portion 2a: Mounting tool 3: Handle housing portion 4: Cabinet (battery pack receiving portion) 4a: Top wall portion 4b of cabinet: Bottom wall portion 4c of cabinet 4c: Cabinet left side wall 4d: Cabinet right side wall 4e: Cabinet back wall 4f: Front of cabinet (insertion slot) 4f1: Upper insertion slot 4f2: Lower insertion slot 5: Trigger switch 6: Hole (engagement piece receiver) window)
7: Partition wall part 8: Connection terminal 9: Battery pack 9a: Insertion part 9b: Cover part (exposed part) 10: Latch part 11: Engagement piece (clamp part)
12: Battery cell 13: Power supply terminal 14: Center of gravity 15: Recessed portion of cabinet 16: Convex portion of battery pack

Claims (9)

A fuselage housing portion that extends in one direction and accommodates a motor portion and a power transmission portion for driving a tip tool;
A handle housing portion coupled to the body housing portion and extending in a direction perpendicular to an extending direction of the body housing portion or in a direction having an angle from the perpendicular direction;
A battery pack receiving portion provided at a distal end portion of the handle housing portion, wherein the battery pack receiving portion is mounted, and the battery pack receiving portion is electrically connected to the motor portion as a driving power source. In the tool
The battery pack receiving part has a cabinet forming a battery accommodating chamber for accommodating the battery pack, and at least one insertion port for inserting the battery pack is opened on a side surface of the cabinet,
A portable electric tool characterized in that the battery pack is inserted from the insertion port while sliding along the inner surface of the cabinet.   A side surface of the cabinet has a plurality of insertion holes for inserting a plurality of battery packs, and the inner surfaces of the cabinet are electrically connected to the battery packs inserted corresponding to the plurality of insertion ports. The portable electric tool according to claim 1, further comprising a connection terminal for parallel connection.   3. The portable electric motor according to claim 1, wherein a partition wall that partitions the battery storage chamber into a plurality of storage chambers and a plurality of the insertion ports is disposed on an inner surface of the cabinet. tool.   At least a part of the outer peripheral surface of the battery pack is formed with a convex portion or a concave portion extending in the insertion direction of the battery pack to be inserted from the insertion port into the battery housing chamber of the cabinet, and is formed on the inner surface of the cabinet. The portable electric device according to any one of claims 1 to 3, wherein a concave portion or a convex portion formed to be slidable is provided in the convex portion or the concave portion of the battery pack. tool.   5. The battery pack according to claim 1, wherein the plurality of battery packs have the same outer shape, and each of the battery packs includes a plurality of battery cells. Portable power tool.   When the battery pack is attached to the cabinet, the battery pack includes an insertion portion that is inserted into the battery housing chamber of the cabinet, and a lid portion that closes the insertion port of the cabinet and is exposed from the insertion port. The portable power tool according to any one of claims 1 to 5, wherein the portable power tool is provided.   The said battery pack is equipped with the retaining piece which can be engaged with the side surface of the said cabinet, when it mounts | wears with the said cabinet, It is described in any one of Claim 1 thru | or 6 characterized by the above-mentioned. Portable power tool.   The cabinet includes a plurality of stages of battery storage chambers and a plurality of stages of insertion ports that are stacked in the extending direction of the handle housing part and partitioned by the partition wall part, and are inserted into the insertion ports. The portable power tool according to any one of claims 1 to 7, wherein the battery pack is slidably inserted in the extending direction of the body housing portion. 9. The motor unit according to claim 1, wherein the motor unit is configured to be operable by the battery pack inserted into at least one of the insertion ports of the plurality of stages of the cabinet. The described portable power tool.

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