WO2015145912A1

WO2015145912A1 - Electric tool

Info

Publication number: WO2015145912A1
Application number: PCT/JP2014/084591
Authority: WO
Inventors: 太輔鵜飼; 祐大杉野
Original assignee: 株式会社マキタ
Priority date: 2014-03-27
Filing date: 2014-12-26
Publication date: 2015-10-01
Also published as: JP2015188952A

Abstract

[Problem] To provide an electric tool that is capable of minimizing vibration and that comprises an output section that moves reciprocally. [Solution] A reciprocating saw (1) comprises a motor (a rotary drive shaft (42)), a power conversion section (4) that is driven by the motor (the rotary drive shaft (42)), a rod (6) that is connected to the power conversion section (4), a first counterweight (84a) that is arranged on one side of the rod (6), and a second counterweight (84b) that is arranged on the other side of the rod (6). In addition, the rod (6) is provided with a slider (58) that is connected to the power conversion section (4), the counterweights (84a, 84b) are connected to the rod (6), and the slider (58) and the counterweights (84a, 84b) are arranged so as to be on the same horizontal plane.

Description

Electric tool

The present invention relates to an electric tool having an output unit that reciprocates, such as a reciprocating cutting tool that reciprocates a blade to cut a workpiece.

As shown in Patent Document 1 below, a reciprocating saw that performs a cutting operation by reciprocating a rod attached with a blade is known.
In this reciprocating saw, the rotational motion output from the electric motor is converted into the reciprocating motion of the rod by the reciprocating motion mechanism.

JP 2002-370123 A

Since the reciprocating saw of Patent Document 1 has a reciprocating mechanism, the blade can be reciprocated to perform a cutting operation, but vibration is generated during the cutting operation. Even if vibrations occur, work assuming vibrations can be performed. However, if vibrations are suppressed, the work becomes even easier.
Accordingly, the main object of the present invention is to provide an electric tool capable of suppressing vibration while having an output unit that reciprocates.

In order to achieve the above object, the invention according to claim 1 is an electric tool including a motor, a reciprocating motion conversion unit driven by the motor, and an output unit connected to the reciprocating motion conversion unit. It has a 1st counterweight arrange | positioned at the one side of the said output part, and a 2nd counterweight arrange | positioned at the other side of the said output part.
In order to achieve the above-described object, the invention according to claim 2 extends in a vertical direction, a motor, a reciprocating motion conversion unit driven by the motor, an output unit including a slider connected to the reciprocating motion conversion unit, and the like. A power tool having a handle portion, wherein a counterweight connected to the reciprocating motion conversion portion or the output portion is provided, and the slider and the counterweight are arranged so as to enter the same horizontal plane. It is characterized by.
In order to achieve the above object, a third aspect of the present invention is directed to a motor, a reciprocating motion conversion portion driven by the motor, an output portion connected to the reciprocating motion conversion portion, and a handle portion extending vertically. A counterweight drive unit connected to the reciprocation conversion unit or the output unit, and a counterweight connected to the counterweight drive unit, wherein the counterweight drive unit has a vertical direction It is characterized by being connected to a rotating shaft extending in the direction.
According to a fourth aspect of the present invention, in addition to the above object, in order to achieve the object of ensuring a smoother operation of the counterweight with a simple configuration, in the above invention, the counterweight driving unit is configured to convert the reciprocating motion. It is connected to the part or the output part and the counterweight via a bearing, respectively.
According to a fifth aspect of the present invention, in order to achieve the above object, in the above invention, the counter weight is disposed on one side of the output unit and on the other side of the output unit. The counter weight drive unit is connected to the reciprocating motion converting unit or the output unit and the first counter weight, and the reciprocating motion converting unit. Alternatively, the output unit is connected to the second counter weight and a portion connected to the first counter weight.
In addition to the above-mentioned object, the invention described in claim 6 is to make the operation of the counterweight more reliable with a simple configuration, and to achieve the object of further improving the vibration proof property and durability. A counterweight guide capable of contacting the counterweight that moves is provided.
In addition to the above object, the invention according to claim 7 achieves an object of providing an electric tool that is simpler and more compact and has higher vibration proofing and durability. It is characterized by being integral with the housing of the reciprocating motion conversion unit.

According to the present invention, it is possible to provide an electric tool capable of suppressing vibration while having an output unit that reciprocates.

It is a partial center longitudinal cross-sectional view of the reciprocating saw according to the present invention (when the counterweight is retracted). FIG. 2 is a perspective view of FIG. 1. FIG. 2 is a perspective view of FIG. 1 (when the counterweight is advanced). FIG. 3 is a top view of FIG. 2. FIG. 4 is a top view of FIG. 3. FIG. 5 is a sectional view taken along line BB in FIG. 4. FIG. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a cross-sectional view taken along the line DD of FIG.

Hereinafter, embodiments of the present invention and modifications thereof will be described with reference to the drawings as appropriate.
The said form concerns the reciprocating cutting tool as an example of an electric tool, More specifically, it concerns a reciprocating saw.
In addition, this invention is not limited to the said form and the example of a change.

1 is a cross-sectional view of a part of the reciprocating saw 1 (AA line in FIG. 4), and FIGS. 2 and 3 are perspective views of the reciprocating saw 1 (only a front upper housing 22a and a guide shoe 12 described later are omitted). 4 is a top view of the reciprocating saw 1 (only the front upper housing 22a described later is omitted), FIG. 5 is a top view of the reciprocating saw 1 (only the front upper housing 22a and guide shoe 12 described later are omitted), and FIG. 4 is a sectional view taken along line BB (partially omitted) in FIG. 4, FIG. 7 is a sectional view taken along line CC (partially omitted), and FIG. 8 is a sectional view taken along line DD (partially omitted). . The right side of FIGS. 1, 4 and 5 is the front of the reciprocating saw 1, the top of FIGS. 4 and 5 is the left of the reciprocating saw 1, and the top of FIG. Each direction is determined for convenience of explanation, and may actually change depending on the work material, the orientation of the operator, and the like.
The reciprocating saw 1 includes a power unit 2, a power transmission unit 4 as a reciprocating conversion unit, a rod 6 as an output unit connected to the power transmission unit 4, a counterweight mechanism 8 combined with the rod 6, and a housing for housing these 10, a guide shoe 12 protruding from the front end of the housing 10, and a cord V extending from the rear lower portion of the housing 10.

The housing 10 includes a main body housing 20 that houses the power unit 2, and a front housing 22 that houses the power transmission unit 4, the rod 6, and the counterweight mechanism 8 on the front side of the main body housing 20.
The main body housing 20 is separated into a front part and a rear part, and only the rear part is separated into left and right. The front part of the main body housing 20 is a cylindrical front main body housing 20a, the rear left part of the main body housing 20 is a rear left main body housing 20b, and the rear right part of the main body housing 20 is a rear right main body housing 20c. These are

screws

24, 24 with respect to the rear left main body housing 20b and the rear right main body housing 20c with the rear end of the front main body housing 20a aligned with the front end portions of the rear left main body housing 20b and the rear right main body housing 20c.・ Associating each other by passing left and right.
The rear portion of the main body housing 20 is formed in a loop shape, and the rear portion of the loop is a handle portion 26 that extends in the vertical direction. A trigger-type switch 28 is disposed on the front side of the handle portion 26.
The front housing 22 is separated vertically and includes a front upper housing 22a and a front lower housing 22b. The front lower housing 22b is fixed to the lower part of the front end of the front main body housing 20a by a plurality of screws 30 in the front-rear direction. The front upper housing 22a is fixed to the front lower housing 22b by a vertical screw (not shown) with the rear end portion being placed on the front upper portion of the front main body housing 20a.
The gear plate 75 described later also functions as a housing (front housing 22) that houses the power transmission unit 4 (gear 50 described later).

The power unit 2 includes an electric motor (not shown other than the rotation drive shaft 42). The rotation drive shaft 42 of the motor is along the front-rear direction and is disposed at the front portion of the motor. Teeth are formed around the tip of the rotary drive shaft 42.
The motor is electrically connected to the cord V and the switch 28, and is supplied with power from the cord V when the switch 28 is turned ON (trigger is pulled).
A fan 44 is disposed outside the rear portion of the rotation drive shaft 42. The fan 44 is fixed to the rotation drive shaft 42.

Exhaust ports

45, 45,... Through which the exhaust of the fan 44 passes are provided at locations on the rear end of the front upper housing 22a and the rear end of the front lower housing 22b on the radially outer side of the fan 44. Each exhaust port 45 is formed by arranging a plurality of slits.
A bearing 46 is disposed in front of the fan 44 and around the rotation drive shaft 42. The bearing 46 rotatably receives the rotary drive shaft 42 and is fixed by being sandwiched between the rear end portion of the front upper housing 22a and the rear end portion of the front lower housing 22b.

The power transmission unit 4 includes a horizontal disc-shaped gear 50 having a bevel tooth meshing with a tooth at the tip of the rotational drive shaft 42, a vertical support shaft 54 that passes through the center of the gear 50, and an upper peripheral edge of the gear 50. A guide roller 56 attached so as to protrude upward from the section, and a slider 58 that receives the guide roller 56 so as to be reciprocally movable left and right are provided.
The slider 58 can be handled not as a component of the power transmission unit 4 but as a component of the output unit (rod 6).

The gear 50 is disposed above the tip of the rotational drive shaft 42 and can rotate around the support shaft 54. A bearing 60 is interposed between the gear 50 and the support shaft 54. Since the diameter (number of teeth) of the gear 50 is larger than the diameter (number of teeth) of the rotation drive shaft 42 of the motor, the rotation of the rotation drive shaft 42 is decelerated by the gear 50.
The lower portion of the support shaft 54 is fixed by inserting it into the hole of the front lower housing 22b.

The guide roller 56 is attached at a position eccentric with respect to the rotation center of the gear 50. The guide roller 56 is rotatably supported on a shaft 62 integral with the gear 50, which is attached so as to protrude upward from the upper portion of the peripheral portion of the gear 50, and can rotate around the shaft 62 in the vertical direction. It is.
The slider 58 is a horizontally long member extending in the left-right direction. The slider 58 has a groove portion with a U-shaped cross section that extends in the left-right direction and opens downward, and a guide roller 56 is contained in the groove portion. The guide roller 56 can move along the groove portion by rotating in the groove portion of the slider 58.
When the gear 50 rotates and the guide roller 56 is displaced (revolved), the longitudinal displacement component of the guide roller 56 is transmitted to the slider 58. Therefore, the slider 58 reciprocates back and forth via the guide roller 56. The displacement component in the left-right direction during the revolution of the guide roller 56 is not transmitted to the slider 58 as the guide roller 56 rotates in the slider 58 and reciprocates left and right.

The rod 6 is a member extending in the front-rear direction, and a blade attachment portion 70 is provided at the front end portion thereof. The blade mounting portion 70 swells up and down and left and right with respect to the round rod-shaped rod base 71 on the rear side. A blade (not shown) is attached to the blade attachment portion 70.
A front rod guide 72 and a rear rod guide 73 are disposed outside the rod base 71. The front rod guide 72 and the rear rod guide 73 have holes in the front-rear direction that receive the rod base 71 and have the same diameter as the rod base 71. The rear rod guide 73 is long to the left and right, and has the same width as the inside of the front housing 22 (left and right direction). A seal ring 74 a and an X ring 74 b that receive the rod base 71 are provided on the front side of the front rod guide 72. The seal ring 74a and the X ring 74b are seal members for preventing dust from entering inside.
The front rod guide 72, the rear rod guide 73, the seal ring 74a, and the X ring 74b are fixed to the inner surface of the front lower housing 22b via a gear plate 75, respectively. The front rod guide 72 and the gear plate 75 are fixed by

screws

72a and 72a, and the rear rod guide 73 and the gear plate 75 are fixed by

screws

73a and 73a. The rod 6 is guided by the front rod guide 72 and the rear rod guide 73 (and the seal ring 74a and the X ring 74b) and is movable in the front-rear direction.
The gear plate 75 is a horizontal plate-like member having a hole that avoids the central portion of the gear 50 at the central portion, and is positioned on the upper side of the gear 50 so that the gear 50 is shifted upward from the fixed position. It is preventing. Further, the gear plate 75 includes a guide portion 75a (75b) as a counterweight guide that stands upward and spreads in the front-rear and up-down directions on the left portion (right portion).
A slider 58 is fixed to the rod base 71 with the U-shaped groove exposed, and the rod 6 is reciprocated back and forth by a guide roller 56 received by the slider 58.
The blade passes through the guide shoe 12. The guide shoe 12 includes a shoe plate 77 that can contact a workpiece, and a shoe supporter 78 that is disposed between the shoe plate 77 and the front lower housing 22b. The shoe plate 77 is attached to the front end portion of the shoe supporter 78 through a shaft 79 in the left-right direction, and is rotatable around the shaft 79.

The counterweight mechanism 8 includes a pair of horizontal connecting

rods

80a and 80b serving as a counterweight driving unit, a pin 82a (82b) serving as a vertical rotation shaft connected to the connecting rod 80a (80b), and a pair extending in the front-rear direction.

Counter weights

84a and 84b, a vertical weight side bearing 86a (86b) disposed on the counter weight 84a (84b), and a vertical rod side bearing 88.
The connecting

rods

80a and 80b are the same members, and the

pins

82a and 82b are the same members, except for the shape of the connecting

rods

80a and 80b (the presence or absence of bending of the end portions) and the arrangement of each member. The

counterweights

84a and 84b are the same members as each other, and the

weight side bearings

86a and 86b are the same members as each other. The

weight side bearings

86a and 86b and the rod side bearing 88 are needle bearings.

Each connecting rod 80a (80b) has a rectangular plate shape having a long side and a short side, and has a hole having the same diameter as that of the pin 82a (82b) in the center, and the pin 82a (82b) passes through the hole. By doing so, it can rotate around the pin 82a (82b) disposed at the center in the longitudinal direction.
In addition, an elliptical long hole 90a (90b) is provided at the first end of each connecting rod 80a (80b) (the front end in FIGS. 1, 2 and 4). At the end (the rear end in FIGS. 1, 2 and 4), an elliptical long hole 91a (91b) is provided. The right connecting rod 80b is bent twice at the boundary of the first end so that the first end is parallel to the other part and above the other part. The first end of the connecting rod 80b is overlapped with the first end of the connecting rod 80a so that the first end of the connecting rod 80b is on the upper side. 90a (90b) is piled up, and the rod side bearing 88 is passed through the long hole 90a (90b) in common.
The rod side bearing 88 is fixed to the upper part of the rod base 71 of the rod 6. The rod side bearing 88 is disposed between the front rod guide 72 and the rear rod guide 73. The rod side bearing 88 can roll in the long hole 90a (90b). The connecting rod 80a (80b) having the long hole 90a (90b) is rotated around the pin 82a (82b) under the action of the rod 6 moving back and forth via the rod side bearing 88.

Counter weights

84 a and 84 b are provided on one side and the other side of the rod 6. More specifically, the first counterweight 84a (second counterweight 84b) is disposed on the left (right) side of the rod base 71. The front end portion of the counterweight 84a (84b) is swollen with respect to the base portion on the rear side, the front end portion is a rectangular parallelepiped shape, and the base portion is a round bar shape.
A guide portion 75a (75b) of the gear plate 75 is located outside the front end portion of the counterweight 84a (84b). The outer surface of the front end portion of the counterweight 84a (84b) and the inner surface of the guide portion 75a (75b) are in contact with each other. When the counterweight 84a (84b) reciprocates, the guide portion 75a (75b) Guides (regulates) the counterweight 84a (84b) in the front-rear direction. The guide portion 75a (75b) is provided on a gear plate 72 that prevents the gear 50 from floating, and is integral with a housing (a part of) the power converter 4 (gear 50). It also functions as a housing and counterweight guide.
The base portion of the counterweight 84a (84b) passes through the left portion (right portion) of the rear rod guide 73. A hole having the same diameter as the base of the counterweight 84a (84b) is provided in the left part (right part) of the rear rod guide 73, and the base of the counterweight 84a (84b) is passed through the hole. The counterweight 84a (84b) is guided in the front-rear direction by the rear rod guide 73. Therefore, the rear rod guide 73 also serves as a guide for the counterweight 84a (84b), and guides the rod 6 and the counterweight 84a (84b) in the front-rear direction.

The long hole 91a (91b) at the second end of each connecting rod 80a (80b) is disposed above the front end of the counterweight 84a (84b). A weight-side bearing 86a (86b) fixed to the upper part of the counterweight 84a (84b) is passed through the long hole 91a (91b). The weight side bearing 86a (86b) can roll in the long hole 91a (91b).
The connecting rod 80a (80b) rotated by the forward / backward movement of the rod 6 moves the counterweight 84a (84b) back and forth via the weight side bearing 86a (86b). When the rod 6 advances and the rod-side bearing 88 advances (FIGS. 1, 2 and 4), the long hole 91a (91b) of the connecting rod 80a (80b) moves backward to move the weight-side bearing 86a (86b). Accordingly, the counterweight 84a (84b) moves backward. When the rod 6 is retracted and the rod-side bearing 88 is retracted (FIGS. 3 and 5), the elongated hole 91a (91b) of the connecting rod 80a (80b) is advanced, and the counter is passed through the weight-side bearing 86a (86b). The weight 84a (84b) moves forward. Thus, the longitudinal movement of the rod 6 and the longitudinal movement of the counterweight 84a (84b) are in opposite phases. In addition, since the rod bearing 88 enters the long hole 90a (90b) and the weight side bearing 86a (86b) enters the long hole 91a (91b), the horizontal component related to the rotational movement of the connecting rod 80a (80b) is It does not act on the rod 6 or the counterweight 84a (84b).

An example of the operation of such a reciprocating saw 1 will be described.
The operator sets the blade on the rod 6 in the stopped state so that the saw blade is in front, and applies the front portion of the shoe plate 77 of the guide shoe 12 to the workpiece. When the cord V is connected to the power source and the handle portion 26 is gripped and the switch 28 is turned on, power is supplied to the motor, the rotary drive shaft 42 rotates, the gear 50 rotates, and the guide roller 56 rotates. Revolves around.
As the guide roller 56 revolves, the rod 6 moves back and forth through the slider 58. The guide roller 56 also rotates within the slider 58.

Further, the rod 6 moves back and forth in a state where vibration is suppressed by

counterweights

84a and 84b on both sides that move back and forth symmetrically.
The counterweight mechanism 8 reciprocates the

counterweights

84a and 84b symmetrically with the rod 6. When the counterweight 84a (84b) moves back and forth, the counterweight 84a (84b) contacts the corresponding hole in the rear rod guide 73 and the guide portion 75a (75b) and is guided in the front-rear direction.
When the rod 6 moves forward (FIGS. 1, 2 and 4), the

elongated holes

90a and 90b of the connecting

rods

80a and 80b move forward, and the connecting

rods

80a and 80b rotate around the

pins

82a and 82b. The

long holes

91a and 91b move backward, and the

counterweights

84a and 84b move backward.
When the rod 6 moves rearward (FIGS. 3 and 5), the

elongated holes

90a and 90b of the connecting

rods

80a and 80b move rearward and the connecting

rods

80a and 80b rotate around the

pins

82a and 82b, and the elongated hole 91a. , 91b move forward, and the

counterweights

84a, 84b move forward.
The

counterweights

84a and 84b have the same weight as each other, and are arranged symmetrically around the rod 6 (slider 58) in the left-right direction, so that the vertical positions are aligned (the rod 6 on the same horizontal plane). (Slider 58) and

counterweights

84a and 84b can be partly inserted) to improve the anti-vibration performance, and also to improve the anti-vibration performance by securing a balance in the left-right direction. It is.

When the operator pushes the handle portion 38 while the rod 6 or the blade is in operation, the saw blade on the front side of the blade 6 moving back and forth hits the workpiece, and the workpiece is cut with the vertical direction as the cutting direction.
When the operator turns off the switch 28, the rotation drive shaft 42 of the motor stops and various back and forth movements stop.

The reciprocating saw 1 includes a motor (rotation drive shaft 42), a power conversion unit 4 driven by the motor (rotation drive shaft 42), and a rod 6 connected to the power conversion unit 4. It has the 1st counterweight 84a arrange | positioned at one side, and the 2nd counterweight 84b arrange | positioned at the other side of the rod 6. FIG. Therefore, the

counter weights

84a and 84b are arranged on both the one side and the other side of the reciprocating rod 6 so that the counter weight is considered in consideration of balance and the like as compared with the case where the counter weight is arranged only on one side or only on the other side. The overall arrangement of the weights can be realized, and the reciprocating saw 1 having excellent vibration isolation can be provided.
The reciprocating saw 1 also extends in the vertical direction with a motor (rotary drive shaft 42), a power converter 4 driven by the motor (rotary drive shaft 42), and a rod 6 provided with a slider 58 connected to the power converter 4. The

counter weights

84a and 84b connected to the rod 6 are provided. The slider 58 and the

counter weights

84a and 84b are disposed so as to enter the same horizontal plane. Therefore, the arrangement of the rod 8 and the

counterweights

84a and 84b in consideration of balance and the like can be realized, and the reciprocating saw 1 having excellent vibration isolation can be provided.
Furthermore, the reciprocating saw 1 includes a motor (rotation drive shaft 42), a power conversion unit 4 driven by the motor (rotation drive shaft 42), a rod 6 connected to the power conversion unit 4, and a handle portion 26 extending in the vertical direction. Are provided with connecting

rods

80a and 80b connected to the rod 6 and

counterweights

84a and 84b connected to the connecting

rods

80a and 80b. The connecting

rods

80a and 80b are pins extending in the vertical direction. 82a and 82b. Therefore, it is possible to provide the reciprocating saw 1 that is capable of smoothly moving the

counterweights

84a and 84b with a simple configuration and is excellent in vibration proofing.

In addition, the connecting

rods

80a and 80b of the reciprocating saw 1 are sequentially connected to the rod 6 and the

counterweights

84a and 84b via a rod side bearing 88 and

weight side bearings

86a and 86b. Therefore, the connecting

rods

80a and 80b can be smoothly moved by the rod side bearing 88 and the

weight side bearings

86a and 86b, and the

counter weights

84a and 84b can be smoothly moved with a simple configuration, and excellent in vibration proofing. Reciprocating saw 1 can be provided.
The reciprocating saw 1 is provided with

guide portions

75a and 75b that can come into contact with

counterweights

84a and 84b that move back and forth. Therefore, it is possible to provide the reciprocating saw 1 having further improved vibration proofing by ensuring the operation of the

counterweights

84a and 84b.
Furthermore, the

guide portions

75a and 75b are integral with the housing (gear plate 75) of the power conversion portion 4. Therefore, the housing and the

counter weights

84a and 84b can be used as a single member, and the reciprocating saw 1 can be provided with more reliable operation and further excellent vibration proofing while reducing the number of parts.

In addition, this invention is not limited to the said form, For example, the following changes can be given suitably.
The right connecting rod may be flat, the left connecting rod may be bent and overlapped on the right connecting rod, or both connecting rods may be flattened or folded together and then overlap each other.
The reciprocating movement of the rod or counterweight may be the vertical direction with respect to the vertical handle portion.
In the reciprocating conversion unit, the gear type may be changed, the number of gears may be changed, or a mechanism other than the crank may be employed.
In the counterweight mechanism, a mechanism other than two horizontally rotating connecting rods, such as changing the number of connecting rods or using a crank mechanism, is used to reciprocate the counterweight in the opposite phase to the rod. Good.
The shape of various members can be changed, for example, the shape of the counterweight is a round bar as a whole, and the guide surface shape of the guide portion of the counterweight is a cylindrical surface. Also, two guide parts are provided for one counter weight, four counter weights are arranged on the left and right sides, and two connecting rods are provided on the left and right sides. The number and arrangement of various members can also be changed, for example, by separating the front part of the main body housing into the front left and the front right. Furthermore, it can change to the member of another structure which has the same function about various members, such as fixing with a nail | claw part and a latching | locking part instead of fixing by screwing.
The blade may have a blade other than a saw blade.
Instead of power supply by the power cord, power supply by a battery may be used, and the battery may be mounted on a main body housing or the like.
The present invention can be applied to reciprocating cutting tools other than reciprocating saws, and can also be applied to electric tools other than reciprocating cutting tools.

1 .. Reciprocating saw (reciprocating cutting tool, electric tool) 4 .. Power transmission part (reciprocating conversion part), 6 .. Rod, 26.. Handle part, 42. ..Slider, 75a, 75b..Guide part (counter weight guide), 80a, 80b..Connection rod (counter weight drive part), 82a, 82b..Pin (rotary shaft), 84a. Counter weight, 84b... (Second) counter weight, 86a, 86b .. Weight side bearing (counter weight side bearing), 88 .. Rod side bearing (output portion side bearing).

Claims

A motor,
A reciprocating motion conversion unit driven by the motor;
An electric power tool having an output unit connected to the reciprocating motion conversion unit,
An electric tool comprising: a first counterweight disposed on one side of the output unit; and a second counterweight disposed on the other side of the output unit.
A motor,
A reciprocating motion conversion unit driven by the motor;
An output unit comprising a slider connected to the reciprocating conversion unit;
A power tool having a handle portion extending in a vertical direction,
A counterweight connected to the reciprocating motion conversion unit or the output unit is provided,
The power tool, wherein the slider and the counterweight are disposed so as to fall on the same horizontal plane.
A motor,
A reciprocating motion conversion unit driven by the motor;
An output unit connected to the reciprocating conversion unit;
A power tool having a handle portion extending in a vertical direction,
A counterweight drive unit connected to the reciprocating motion conversion unit or the output unit;
A counter weight connected to the counter weight drive unit is provided,
The power tool characterized in that the counterweight drive unit is connected to a rotary shaft extending in the vertical direction.
The electric power tool according to claim 3, wherein the counterweight drive unit is connected to the reciprocating motion conversion unit or the output unit and the counterweight via a bearing.
The counter weight has a first counter weight disposed on one side of the output unit and a second counter weight disposed on the other side of the output unit,
The counter weight drive unit is connected to the reciprocation conversion unit or the output unit and the first counter weight, and a portion connected to the first counter weight in the reciprocation conversion unit or the output unit. The power tool according to claim 3, wherein the power tool is connected to the second counterweight.
The power tool according to any one of claims 1 to 5, further comprising a counterweight guide capable of contacting the counterweight that reciprocates.
The electric power tool according to claim 6, wherein the counterweight guide is integral with a housing of the reciprocating motion conversion unit.