JP5314921B2 - Battery powered portable power tool - Google Patents

Description

  The present invention relates to a battery-type portable power tool including a battery that supplies power to a motor.

  Conventionally, as a battery-type portable electric tool, as described in Patent Document 1 below, a motor is housed in a gripping portion, and a DC power source (battery) that supplies power to the motor is a rear end on an extension line of the gripping portion. The technology to prepare for is known. However, since this type of battery-powered portable power tool houses the motor in the gripping part, the gripping part becomes quite thick and difficult to grip reliably with one hand, so that the operability during work is poor. There were drawbacks.

On the other hand, as a portable electric tool, as described in Patent Document 2 below, in order to improve the ease of gripping and operability during work, a drive unit that houses a motor is disposed behind the housing. A head unit that houses a transmission device that transmits a driving force from the motor and has a processing unit that processes a workpiece is disposed, and the motor and the transmission device are connected by transmission between the driving unit and the head unit. A technique has been proposed in which a gripping part that houses a transmission shaft is arranged.
Japanese Utility Model Publication No. 4-102783 Japanese Utility Model Publication No. 60-103642

  However, according to the techniques of Patent Document 1 and Patent Document 2, the difficulty of gripping is improved, but the weight balance fulcrum (moment fulcrum) when the operator grips the battery-powered portable power tool. Since the total weight of the drive unit and the battery installed at the rear is larger than the weight of the head unit provided at the front of the gripping part, and the weight balance between the front and rear becomes worse, work on the gripping hands and arms Therefore, in addition to the force acting on this type of tool, an extra force for gripping this type of tool in a balanced manner must be applied. For this reason, there are problems such as poor operability during work and increased fatigue of hands and arms.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a battery-type portable electric tool that is easy to handle and has good operability and is not easily fatigued.

The battery-type portable electric tool of the present invention includes a drive unit that is located at the rear and accommodates a motor, a head unit that is located at the front and accommodates a transmission device, and includes a machining part that processes a workpiece, and the drive unit. A portable power tool including a gripping portion for accommodating a transmission shaft for transmitting a driving force of the motor to the processing portion between the head portion and the head portion. Is disposed adjacent to the lower side of the drive unit in which the motor is accommodated and adjacent to the rear end of the gripping unit, and the bottom surface of the battery and the gripping unit are inclined with the front facing downward. The battery mounting part provided below the driving part is formed in parallel with the bottom surface of the battery .

  In the above configuration, the battery for supplying power to the motor is disposed adjacent to the lower part of the drive unit in which the motor is accommodated, so that the battery is positioned closer to the gripping unit, and the gripping unit is placed in the weight balance of the tool. The weight balance before and after the fulcrum (moment fulcrum) is improved, and there is no need to apply extra force to balance the weight of the tool even when machining the work piece. , Fatigue is also reduced.

Further, in the above configuration, the battery is disposed adjacent to the lower part of the drive unit in which the motor is accommodated, and is disposed adjacent to the rear end of the gripping unit. Improves the operability and reduces fatigue.

  The battery-powered portable power tool of the present invention is characterized in that a bumper for protecting an operation panel including a control board is provided on the rear end surface of the drive unit in which the motor is accommodated.

  In the above configuration, a bumper that protects the operation panel including the control board is provided on the rear end surface of the drive unit in which the motor is accommodated, so that when the tool falls from behind or during the work, When the rear end collides with an obstacle, the bumper first collides with the floor or the obstacle first, and the operation panel can be prevented from being damaged.

  Since the battery-type portable power tool of the present invention has a configuration in which a battery for supplying power to the motor is disposed adjacent to the lower side of the drive unit in which the motor is accommodated, the gripping unit is used as a fulcrum (moment for the weight balance of the tool). The weight balance between the front and rear is improved, so that operability is improved and fatigue is reduced.

  Hereinafter, a battery-type portable power tool according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view of a reciprocating saw which is a kind of battery-powered portable electric tool of the present invention, and FIG. 2 is a left side view of FIG.

  As shown in FIG. 1, a reciprocating saw 1 which is a kind of battery-powered portable power tool includes a drive unit 3 that houses a motor 2 at the rear and a processing unit 4 that processes a workpiece (not shown) at the front. The head portion 5 is provided, and the grip portion 7 is disposed between the drive portion 3 and the head portion 5 and accommodates a transmission shaft 6 for transmitting the driving force of the motor 2 to the processing portion 4.

  As shown in FIG. 2, the reciprocating saw 1 includes a housing 10 that is divided into two. That is, the end face of one half member and the end face of the other half member are brought into contact with each other and tightened with a set screw (not shown) to be integrated.

  The drive unit 3 includes a rear main body 17 on the rear side of the housing 10 and the motor 2 accommodated in the rear main body 17. As shown in FIG. 1, the motor 2 is disposed substantially at the center of the rear body portion 17 in the vertical direction, and is disposed at the center of the width in the horizontal direction shown in FIG. 2. The motor shaft 20 of the motor 2 is rotatably supported by the rear body portion 17 via front and rear bearings 21 and 22.

  The grip portion 7 includes a grip body portion 25 of the housing 10 formed on the front side of the rear body portion 17 and the transmission shaft housed in the grip body portion 25 and arranged coaxially with the motor shaft 20 of the motor 2. 6 and a trigger type switch 26 for turning on / off the drive of the motor 2.

The transmission shaft 6 is disposed on the center line in the left-right direction in FIG. 2 of the grip body 25 and is connected to the motor shaft 20 of the motor 2 via the connection sleeve 27 on the same axis. The distal end portion of the transmission shaft 6 is rotatably supported through a bearing 24 provided in the head portion 5. Further, a driving gear 60 made of a bevel gear is provided at the tip of the transmission shaft 6, and the driving force of the motor 2 is transmitted to the driven gear 61 accommodated in the head portion 5 by the driving gear 60.

  The grip body portion 25 has a continuous curved surface portion 29 that is continuous with the rear body portion 17, and the continuous curved surface portion 29 is formed by a curved surface that gradually decreases from the rear body portion 17 toward the front as shown in FIG. 1. Has been. Further, the grip body part 25 is inclined downward from the front end part of the rear body part 17 toward the front. On the other hand, the transmission shaft 6 is supported horizontally in the grip body 25. The switch 26 is accommodated below the front portion of the grip body 25.

  The head part 5 is disposed further forward of the grip body part 25 of the housing 10 with a screw (not shown) and a lower part of the front body part 33 so as to protrude further forward. It is comprised from the process part 4 which consists of the processing tool 35 which was provided and formed the saw blade. Further, the front main body 33 has a transmission device 36 including a driven gear 61 for transmitting a rotational driving force via a driving gear 60 provided at the tip of the transmission shaft 6 and a horizontal reciprocating motion. And a reciprocating mechanism 37 for changing into motion. The reciprocating mechanism 37 includes a reciprocating shaft 38 that guides the processing tool 35 so as to freely reciprocate horizontally. A base portion 35a of the processing tool 35 is connected to the tip of the reciprocating shaft 38, and the processing tool 35 reciprocates in the horizontal direction via the transmission device 36 and the reciprocating mechanism 37 by driving the motor 2. ing.

  A battery mounting portion 17 a is provided below the rear main body portion 17 constituting the driving portion 3. The battery mounting portion 17a is adjacent to the motor 2 accommodated in the rear body portion 17 as much as possible, and the tip position thereof is formed at the rear end of the grip body portion 25 constituting the grip portion 7. It is provided in contact with the curved surface of the continuous curved surface portion 29. A battery 18 having a plurality of storage batteries (not shown) is detachably mounted inside the battery mounting portion 17a. In the present embodiment, the tip end position of the battery mounting portion 17a is provided so as to be substantially in contact with the curved surface of the continuous curved surface portion 29.

  Since the battery 18 is provided at such a position, the center of gravity of the battery 18 is closer to the gripping portion 7 including the gripping body portion 25 gripped by the operator in the front-rear direction and the vertical direction in FIG. Even if the drive unit 3 and the battery 18 are arranged behind the head 5 arranged in front of the unit 7, it is possible to balance the weight before and after the grip unit 7. Therefore, this kind of tool centered on the gripping part 7 when the gripping body part 25 is gripped (center) as shown in FIG. The moment to rotate in the vertical direction disappears or at least decreases.

  For this reason, generally the force to balance the weight when an operator grips this type of tool, for example if the weight of the rear part of the tool is heavier than the weight of the front part, However, in the present invention, such a force for balancing the weight is not necessary. Accordingly, the force for pressing the processing tool 35 against the work piece can be reduced, the operability is improved, and the fatigue of the hands and arms is reduced even when used for a long time.

  Further, since the battery 18 is provided at the above position, the total length of the tool is shortened, the work in a narrow place is facilitated, the battery 18 is less likely to hit the operator's body, and the operability is improved.

  The battery mounting portion 17a is provided with the front inclined downward with respect to a reciprocating shaft 38 that guides the processing tool 35 so as to freely reciprocate. In this embodiment, it is inclined at 10 degrees, which is an angle substantially equal to the inclination of the gripping body portion 25. For this reason, the bottom surface 18 a of the battery 18 mounted on the battery mounting portion 17 a is also inclined forward and downward with respect to the reciprocating shaft 38.

  Since the bottom surface 18a of the battery 18 is inclined forward with respect to the reciprocating shaft 38, when the bottom surface 18a of the battery 18 of this kind of tool is placed on the floor surface, the processing tool 35 is further separated from the floor surface. Thus, the risk that the processing tool 35 may accidentally touch the floor surface and damage the floor surface is reduced. In this embodiment, the battery mounting portion 17a is inclined to incline the bottom surface 18a of the battery 18. However, the battery mounting portion 17a is parallel to the reciprocating shaft 38 and the bottom surface 18a of the battery 18 itself is inclined. Also good.

  Further, in the present embodiment, as shown in FIGS. 1 and 2, the upper side of the rear end surface 17b of the rear body portion 17 constituting the drive unit 3 is inclined forward, and the inclined rear end surface 17b is controlled. An operation panel 51 provided with a substrate 50 is provided on substantially the same plane. The operation panel 51 is provided with a switch for turning on / off the lighting device and a display unit for displaying the remaining battery level of the battery 18. In addition, since the operation panel 51 is provided to be inclined toward the front, it is easy to see and operate this type of tool while the operator holds the tool.

  A bumper 17c projecting further rearward from the rear end surface 17b is integrally formed at the lower end of the rear end surface 17b of the rear main body portion 17 below the operation panel 51. As shown in FIG. 2, the length of the bumper 17c is longer than the width in the left-right direction of the operation panel 51 and is formed to be almost full of the width in the left-right direction of the rear end surface 17b of the rear main body portion 17.

  For this reason, even when this kind of tool falls from the rear to the floor surface, the bumper 17c first collides with the floor surface and the like, and the operation panel 51 and the control board 50 provided on the rear end surface 17b of the rear main body portion 17 etc. Can be prevented from breakage.

  In the above embodiment, the bumper 17c is formed integrally with the rear main body portion 17, but a bumper as a separate member made of steel or the like may be fixed with screws or the like, and a part or all of the bumper may be made of rubber or soft resin. It may be covered with a shock absorber.

  In the above embodiment, the present invention is applied to a reciprocating saw that cuts a workpiece with a saw blade. However, the present invention is not limited to this, and can be applied to a portable grinder, a portable sander, an impact driver, an angle drill, and the like. .

The front sectional view of the reciprocating saw which shows the embodiment of the present invention. The left view of FIG.

Explanation of symbols

2 motor 3 drive unit 4 processing unit 5 head unit 6 transmission shaft 7 gripping unit 10 housing 17 rear body unit 17c bumper 18 battery 25 gripping body unit 35 processing tool 36 transmission device

Claims (2)

A drive unit that houses the motor at the rear, a head unit that houses the transmission device at the front and that processes the workpiece, and a drive unit between the drive unit and the head unit. A portable electric tool comprising a gripping part for accommodating a transmission shaft for transmitting a driving force to the machining part, comprising a battery for supplying electric power to the motor, and the battery below the driving part for accommodating the motor And a battery mounted on the bottom of the battery and the gripping part, the bottom of the battery and the gripping part being inclined downward in the front and provided below the driving part. The battery-powered portable power tool is characterized in that the portion is formed in parallel with the bottom surface of the battery. The battery-powered portable power tool according to claim 1, wherein a bumper for protecting an operation panel including a control board is provided on a rear end face of the drive unit in which the motor is accommodated.

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