JP2006116632A - Hand-held power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hand-held power tool, performing machining work with a small labor while easiness of holding is secured. <P>SOLUTION: This hand-held power tool 1 is used substantially horizontally with a grip part 7 held. In the power tool, the grip part 7 having a built-in transmission shaft 6 for transmitting the driving force of a motor 2 to a machining part 4 is provided between the driving part 3 having a motor 2 at the back and a head part 5 having a machining part 4 for machining a part to be machined in the front, and the center of gravity G is set in the grip part 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hand-held power tool.

  In general, a hand-held electric tool such as a grinder has a driving device having a motor and the like and a processing tool for processing a workpiece, and the driving device and the processing tool are directly connected via a transmission device. . The drive device and the transmission device are built in the housing, and an operator grips the grip body portion of the housing that covers the drive device (motor) to perform the processing work. However, the gripping body portion incorporating the driving device inevitably has a large diameter. It was difficult and difficult to operate the electric tool while holding the grip body.

  Therefore, in order to easily grip and use the electric tool, a drive device is built in the rear of the housing, a transmission device is built in the front of the housing, and the drive device and the transmission device are connected in transmission in the middle of the housing. There has been proposed a technique in which a gripping body part having a built-in transmission shaft is provided, and an operator uses the power tool by gripping the gripping body part. (For example, refer to cited document 1).

  In this way, when the drive device and the transmission device (processing tool) are arranged apart from each other in the front-rear direction and are connected by transmission transmission with the transmission shaft, the gripping body portion can be thinned, and the operator can By gripping the gripping body portion, the power tool can be gripped easily.

Japanese Patent Laid-Open No. 2002-264042

  However, if the drive device and the transmission device are separated from each other in the front-rear direction, a longer transmission shaft is required. When such a long transmission shaft rotates, vibration corresponding to the length of the shaft is generated. Will be transmitted to the entire hand-held power tool. Therefore, even if the operator can easily grip the electric tool, there is a problem that the machining operation performed while receiving a large vibration is easily fatigued.

  Therefore, an object of the present invention is to provide a hand-held power tool that can perform a machining operation that is hard to get tired while ensuring ease of gripping.

  The hand-held power tool 1 according to the present invention is configured such that the driving force of the motor 2 is applied between the driving unit 3 having the motor 2 at the rear and the head unit 5 having the processing unit 4 for processing the workpiece at the front. A gripping portion 7 having a transmission shaft 6 for transmission to the portion 4 is provided. The gripping portion 7 is gripped and used substantially horizontally. The center of gravity G of the hand-held power tool 1 is applied to the gripping portion 7. It is characterized by the existence.

  In the above-described configuration, the grip portion 7 including the drive shaft 6 for driving force transmission is disposed between the drive portion 3 and the head portion 5, so that the grip portion 7 can be easily gripped by the operator. The operator can easily grip with a small force, and the center of gravity G of the hand-held power tool 1 is present in the grip portion 7, so that vibration caused by the rotation of the transmission shaft 6 occurs in the hand-held power tool 1. Even so, the operator grips the gripping portion 7 with the smallest vibration and performs the work, so that it is possible to easily perform the work of the work portion for a long time with a little effort. .

  The hand-held power tool 1 of the present invention is characterized in that a switch 26 for operating the motor 2 is present on the lower surface of the grip portion 7.

  In the above configuration, when the operator grips the gripping portion 7 and processes the workpiece, the switch 26 for operating the motor 2 is provided on the lower surface of the gripping portion 7, for example, by a simple fingertip operation. Since the switch 26 can be operated, it is possible to easily and easily perform the machining operation of the workpiece using the hand-held power tool 1.

  In the hand-held power tool 1 of the present invention, the switch 26 is a push button type that moves up and down, and is disposed at the front of the lower surface of the gripping portion 7, and a protruding wall 31 that protrudes downward behind the switch 26. It is characterized by being formed.

  In the above configuration, when the operator operates the switch 26 of the hand-held power tool 1, the operator can easily operate the switch 26 only by pressing the switch 26 in the retracting direction. Since it is possible to avoid a state in which a person's finger directly touches the switch 26, it is possible to prevent malfunction of the switch 26 while maintaining good operability of the switch 26.

  The grip portion 7 in the hand-held power tool 1 of the present invention is characterized in that the front portion is formed in an oblique shape that is lower than the rear portion.

  By forming the gripping portion 7 in a slanted shape with the front portion lowered compared to the rear portion, the gripping portion 7 of the handheld power tool 1 is gripped, and the processing portion 4 is placed with the handheld power tool 1 in a horizontal posture. When the processing part 4 is applied to the part to be processed, the operator's wrist is difficult to return and can be used with a natural wrist posture. Therefore, the hands and wrists are less likely to get tired especially during long working hours. Furthermore, since the gripping part 7 is formed in the above-described oblique shape, the lower part of the drive part 3 (the rear side of the gripping part 7) is located above the processing part 4 and is opened. In this case, the drive unit 3 and the operator's hand are not easily obstructed, and the operator can perform accurate processing without taking an unreasonable posture.

  In the hand-held power tool 1 of the present invention, a push button type switch 26 that moves up and down to operate the motor 2 is disposed at the front of the lower surface of the gripping portion 7, and the main shaft 20 of the motor 2 extends in the front-rear direction. The transmission shaft 6 is provided coaxially with the main shaft 20 of the motor 2.

  As in the above configuration, the transmission shaft 6 is provided coaxially with the main shaft 20 of the motor 2 extending in the front-rear direction, and the gripping portion 7 is formed in an oblique shape with the front portion of the gripping portion 7 lowered from the rear portion. A predetermined space can be provided below the transmission shaft 6 while ensuring a size that can be easily gripped, and an electrical component or the like can be mounted in this space.

  The hand-held power tool 1 of the present invention is characterized in that the center in the width direction of the processing tool 35 provided in the processing section 4 is present on the center axis in the width direction of the gripping section 7 in plan view.

  The center in the width direction of the processing tool 35 is present on the center axis in the width direction of the gripping part 7 in plan view, so that when the processing tool 35 is applied to the part to be processed, the handheld power tool 1 is twisted. Since the generation of moment can be suppressed, the machining operation can be easily performed with less effort, and the workpiece can be machined with high accuracy.

  The hand-held power tool of the present invention has a gripping part with a built-in transmission shaft for transmitting the driving force of the motor to the machining part between the driving part having the motor and the head part having the machining part. Since the center of gravity is present in the gripping portion gripped by the person, it is possible to perform processing with less labor while ensuring ease of gripping.

  Hereinafter, a hand-held power tool according to an embodiment of the present invention will be described with reference to the drawings. 1 is a front sectional view of a hand-held power tool according to the present invention, FIG. 2 is a sectional view taken along line DD in FIG. 1, FIG. 3 is a perspective view showing the overall configuration, and FIG. 4 is an overall plan view of the hand-held power tool. FIG.

  As shown in FIG. 1, a hand-held power tool (reciprocating saw) 1 includes a drive unit 3 having a motor 2 at the rear and a processing unit 4 for processing a predetermined workpiece (not shown) at the front. It is provided with a grip portion 7 which is disposed between the portion 5 and between the drive portion 3 and the head portion 5 and incorporates a transmission shaft 6 for transmitting the driving force of the motor 2 to the processing portion 4.

  As shown in FIGS. 2, 3, and 4, the handheld power tool 1 has a split-type housing 10. That is, a groove (not shown) that fits into the protrusion 15 (see FIG. 1) formed on the outer peripheral surface 12a of the other housing member 12 is formed on the outer peripheral surface 11a of one housing member 11. The outer peripheral facing surface 12 a of the other housing member 12 is combined with the outer peripheral facing surface 11 a of one housing member 11 and is detachably assembled by a set screw 16. That is, the housing 10 has a substantially symmetrical shape with respect to a lateral axis in the left-right width direction (hereinafter simply referred to as “width-direction center line”) 10a in a state where one housing member 11 and the other housing member 12 are combined. Yes.

  The drive unit 3 includes a rear main body portion 17 on the rear side of the housing 10 and the motor 2 incorporated in the rear main body portion 17. As shown in FIG. 1, the motor 2 is disposed substantially at the center of the rear body portion 17 in the height direction, and as illustrated in FIG. 4, it is disposed at the center of the width direction. The main shaft 20 of the motor 2 is rotatably supported by the rear body portion 17 via front and rear bearings 21 and 22. The axis of the main shaft 20 of the motor 2 is disposed on the center line in the height direction of the motor 2 and on the center line 10a in the width direction.

  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 built in the grip body portion 25 and arranged coaxially with the main shaft 20 of the motor 2. 6 and a push button type switch 26 for turning on / off the driving of the motor 2.

  The axis of the transmission shaft 6 is disposed on the center line 10a in the width direction of the grip body 25, and the main shaft 20 and the transmission shaft 6 of the motor 2 are connected to rotate integrally around the shaft center 6a via the connection sleeve 27. Has been. The middle and the tip of the transmission shaft 6 are rotatably supported by the grip body 25 via separate bearings 23 and 24. Further, a driving gear 60 composed 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 gear provided in the head 5 by the driving gear 60. Further, the gripping body portion 25 is formed in a hollow elliptical cross section having a major axis in the vertical direction (hereinafter simply referred to as “height direction”).

  The gripping body portion 25 has a continuous curved surface portion 29 that is continuous with the rear main body portion 17, and the continuous curved surface portion 29, as shown in FIGS. It is formed in the curved surface which reduces sequentially in the width direction. Furthermore, the gripping body part 25 of the gripping part 7 is formed in an oblique shape whose front part is lower than the rear part. In other words, the gripping body portion 25 is inclined downward from the front end portion of the rear rear body portion 17 toward the front, and therefore the axis 25a of the gripping body portion 25 is also inclined downward. On the other hand, since the motor 2 is horizontally disposed at the approximate center of the rear body portion 17 and the transmission shaft 6 is supported horizontally in the grip body portion 25, the lower inner side of the front portion of the grip body portion 25 is provided. A storage space 30 that secures a predetermined space is formed. In order to form the storage space 30, a protruding wall 31 that is bent so as to protrude downward is formed integrally with the lower end of the grip body 25.

  The head portion 5 includes a front body portion 33 fixed with a screw 61 further forward of the grip body portion 25 of the housing 10 and a saw-like shape disposed below the front body portion 33 so as to protrude further forward. And a transmission gear device 36 for transmitting a rotational driving force to the processing tool 35 provided at the tip of the transmission shaft 6 with respect to the processing tool 35. The center in the width direction of the processing tool 35 is coaxially disposed on the center line 10a in the width direction of the grip body 25 (housing 10) in plan view. Further, the base portion 35 b of the processing tool 35 is connected to the transmission gear device 36 via a reciprocating mechanism 37, and the processing tool 35 is driven in the horizontal direction via the transmission gear device 36 and the reciprocating mechanism 37 by driving the motor 2. It is configured to reciprocate finely. The reciprocating mechanism 37 includes a reciprocating shaft 38 that guides the processing tool 35 so as to freely reciprocate.

  As shown in FIGS. 1 and 3, the front main body portion 33 is set to have a smaller left / right width than the rear main body portion 17, and has a larger left / right width and a higher height than the grip body portion 25. Yes. The center position 33 a in the height direction of the front main body portion 33 is set to a position lower than the center position 17 a in the height direction of the rear main body portion 17. Accordingly, the center 35a in the height direction of the processing tool 35 is also disposed below the center position 17a in the height direction of the rear body portion 17 (concentric with the main shaft 20 of the motor 2) by a predetermined distance. This predetermined distance is a distance that is set based on the ease of work of the operator, and the predetermined distance is a distance that does not make it difficult for the operator to work even when the processing tool 35 is applied to the workpiece. There must be.

  In addition, a guide wall 41 is formed integrally with the lower end of the grip main body 25 so as to be opposed to the protruding wall 31 in the front-rear direction and extended longer than the protruding wall 31. Note that the distal end portion of the transmission shaft 6 extends to the inside of the front main body portion 33, the extended portion is supported by the bearing 24, and a drive gear 60 is provided. The storage space 30 formed between the protruding wall 31 and the guide wall 41 is provided with the switch 26. The switch 26 includes an operation member 26A called a trigger, and a switch body 26B operated by the operation member 26A. The operation member 26A is provided so as to be able to move in and out in the vertical direction (height direction) with respect to the grip body 25, and is always urged downward by a spring (not shown). The switch body 26B is disposed in the storage space 30 and is disposed at an upper position opposite the operation member 26A. The front and rear opposing surfaces of the protruding wall 31 and the guide wall 41 are guide surfaces 42 and 43 that guide the operation member 26A so as to be freely retractable. In particular, the guide surface 42 of the protruding wall 31 is extended so as to be bent downward at a steep angle from the inclined inner bottom surface 45 of the grip body 25.

  In the hand-held power tool 1 having the above-described configuration, the center of gravity G is set to exist in the region of the grip portion 7 in consideration of the weight balance of the drive portion 3, the head portion 5, and the grip portion 7. The center of gravity G is preferably present behind the operation member 26A in consideration of operation of the operation member 26A.

  When using the hand-held power tool 1, the operator grips and operates the grip body 25. By the way, the drive part 3 which has the motor 2, and the head part 5 (process part 4) which has the transmission gear apparatus 36 are spaced apart in the front-back direction, and the transmission which transmits the driving force of the main shaft 20 of the motor 2 to the transmission gear apparatus 36 is carried out. Since the shaft 6 is provided in the gripping portion 7, the cross section of the gripping body portion 25 of the gripping portion 7 has a size (diameter) that can be easily gripped, and the gripping body portion 25 has a hollow elliptical cross section that is long in the height direction. The gripping body portion 25 has a size that can be easily adjusted to the operator's hand, and the operator can operate the hand-held power tool 1 while gripping the gripping body portion 25 with a good feel.

  Then, the switch body 26B is operated by pressing the operation member 26A upward with a finger while the operator holds the grip body 25, and this is turned on. Then, the motor 2 is driven and the main shaft 6 and the drive gear 60 are rotated around the axis 6a, and the processing tool 35 is reciprocally moved in the horizontal direction through the transmission gear device 36 and the reciprocating mechanism 37. A place, that is, a part to be processed can be processed. When the operator removes his / her finger from the operation member 26A, the switch body 26B is turned off and the driving of the motor 2 is stopped.

  As described above, the operation member 26A of the switch 26 for operating the drive of the motor 2 is disposed in the lower front portion of the gripping portion 7, and the switch 26 is a push button type. In the gripped state, the operation member 26 </ b> A can be easily withdrawn and retracted with a simple fingertip operation without taking an unreasonable posture. Note that the operation of the operation member 26 </ b> A is smoothly guided in the retreat direction by the projecting wall 31 and the guide surfaces 42 and 43 of the guide wall 41. Furthermore, since the protruding wall 31 is provided at the lower end of the gripping body portion 25, even when the processing operation is interrupted by releasing the finger from the operation member 26A, the operator's finger hits the operation member 26A and the switch 26 is turned off. It is possible to effectively avoid a situation in which an erroneous operation is intentionally performed. That is, erroneous operations can be suppressed while improving the operability of the switch 26.

  In this hand-held power tool 1, the driving unit 3 and the head unit 5 having the processing unit 4 are separated from each other in the front-rear direction, and the gripping body unit 25 of the gripping unit 7 is formed in an oblique shape with the front part lowered compared to the rear part. Thus, the processing unit 4 is arranged below the drive unit 3. For this reason, the lower part of the drive unit 3 (behind the gripping part 7) is open, and the operator's hand enters the open part, so the gripping body part 25 is gripped and the processing tool 35 is applied to the part to be processed. Even now, it can be used with a natural gripping posture. Therefore, the hands and wrists are less likely to get tired especially during long working hours. Moreover, it becomes easy to aim at a to-be-processed part with the processing tool 35, and a to-be-processed part can be easily processed into a required shape.

  By the way, such a hand-held power tool 1 may be used in a horizontal state. In this case, the hand-held power tool 1 has a size that allows the grip body 25 to be easily gripped as described above, and the lower portion of the drive unit 3 is open. Are connected directly via a transmission device, and the operator's hand is less likely to get in the way as compared with the case where the gripping body portion of the housing that covers the drive device is gripped, and the usability is improved. Therefore, even when the hand-held power tool 1 is used in a horizontal state, it is possible to process the workpiece with higher accuracy than in the past. This is also effective when, for example, the hand-held power tool 1 is manually used to move the processing tool 35 for processing.

  Further, the center in the width direction of the processing tool 35 is coaxially arranged on the center line 10a in the width direction of the gripping body portion 25 (housing 10) in plan view (the processing tool 35 is shifted in the width direction of the gripping body portion 25). Therefore, when the processing tool 35 is applied to the portion to be processed and processed, the operator's hand and the processing tool 35 can be positioned substantially on the coaxial line. Therefore, when the operator applies a force necessary for processing to the processing tool 35 (processed portion), an unnecessary moment does not act on the wrist of the operator, and therefore the processing work can be performed easily. Thus, it becomes possible to process the processed part with high accuracy.

  By the way, when the long transmission shaft 6 is connected to the main shaft 20 of the motor 2, vibration due to shaft vibration is generally easily transmitted to the housing 10 when the motor 2 is driven. However, in this hand-held power tool 1, the center of gravity G is set to exist in the region of the grip portion 7 in consideration of the weight balance of the drive unit 3, the head portion 5, and the grip portion 7. Since the operator grips the gripping portion 7 (the gripping body portion 25) with the smallest vibration and performs the processing work, even if there is vibration, the operator's hand is less likely to get tired. Furthermore, as described above, when the motor 2 is stopped, the operator separates the fingertip from the operation member 26A. At this time, since the center of gravity G of the hand-held power tool 1 is present in the grip portion 7, the weight balance of the hand-held power tool 1 as a whole is balanced. Therefore, even when the fingertip is separated from the operation member 26A and the grip body 25 is simply gripped, the operator's hand is less likely to get tired.

  The hand-held power tool 1 shown in the above embodiment has a configuration in which the processing tool 35 is saw-shaped and the processing tool 35 vibrates finely in the horizontal direction by the reciprocating mechanism 37. The part to be processed is processed by. However, the present invention is not limited to the hand-held power tool 1 having such a processing tool 35. As another application, for example, as shown in FIG. The present invention is also applicable to a hand-held power tool 1A (belt sander) having 35A. A processing tool 35A of the hand-held power tool 1A shown in FIG. 5 wraps a sander belt 52 around a main pulley 50 and a sub pulley 51 that are arranged apart in the front-rear direction, and uses the main pulley 50 instead of the reciprocating mechanism 37. It has a mechanism for rotating around the axis, and the workpiece is processed by rotating the sander belt 52 and applying it to the workpiece. A hand-held power tool 1A shown in FIG. 5 includes a drive unit 3 having a motor 2 at the rear, a head unit 5 having a machining unit 4 for machining a predetermined workpiece at the front, the drive unit 3 and the head unit 5. And a gripping part 7 having a built-in transmission shaft 6 for transmitting the driving force of the motor 2 to the machining part 4. In the hand-held power tool 1A shown in FIG. 5, the mechanism for transmitting the driving force of the transmission shaft 6 of the above embodiment to the processing tool 35A is different, and the shape of the housing 10 is slightly different. Since it is the same as that of the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Also in the case of this hand-held power tool 1 </ b> A, by setting the center of gravity G so as to exist in the grip portion 7, the same operational effects as in the above embodiment can be obtained. Further, the center of the processing tool 35A provided in the processing part 4 is located on the center line in the width direction of the gripping part 7 in a plan view so that the processing tool 35A is applied to the part to be processed and is hand-held. Since the generation of the moment in the direction of twisting the electric power tool 1A can be suppressed, the machining operation can be easily performed by that amount, and the workpiece can be machined with high accuracy.

  Furthermore, the present invention is not limited to these embodiments. That is, as shown in FIG. 6, a hand-held power tool (detail sander) 1B having a flat processing surface 35c on the lower surface as the processing tool 35B and rotating the processing surface 35c in the plane is also used. Applicable. In such a hand-held power tool 1B, the processing portion is processed by rotating the processing tool 35B in a plane by applying the processing surface 35c provided on the processing tool 35B to the processing portion. A hand-held power tool 1B shown in FIG. 6 includes a drive unit 3 having a motor 2 at the rear, a head unit 5 having a machining unit 4 for machining a predetermined workpiece at the front, and the drive unit 3 and the head unit 5. And a gripping part 7 having a built-in transmission shaft 6 for transmitting the driving force of the motor 2 to the machining part 4. In the hand-held power tool 1B shown in FIG. 6, the mechanism for transmitting the driving force of the transmission shaft 6 of the above embodiment to the processing tool 35B is different, and the shape of the housing 10 is slightly different. Since it is the same as that of the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Also in the case of this hand-held power tool 1B, by setting the center of gravity G to be present in the grip portion 7, the same operational effects as those of the above embodiments can be obtained. Further, when the processing tool 35B is applied to the workpiece by processing the width direction center of the processing tool 35B provided in the processing unit 4 on the width direction center line 10a of the gripping part 7 in plan view, Since the generation of the moment in the direction of twisting the hand-held power tool 1B can be suppressed, the machining operation can be easily performed by that amount, and the workpiece can be machined with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional front view of a hand-held power tool showing an embodiment of the present invention. The DD sectional view taken on the line in FIG. The perspective view which similarly shows the external appearance of a hand-held power tool. The top view which similarly shows the external appearance of a hand-held power tool. FIG. 6 is a front cross-sectional view of a hand-held power tool showing another type, partially omitted. Furthermore, the top view which shows the external appearance of the hand-held power tool which shows another type.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Hand-held electric tool, 2 ... Motor, 3 ... Drive part, 4 ... Processing part, 5 ... Head part, 6 ... Transmission shaft, 7 ... Holding part, 10 ... Housing, 17 ... Rear body part, 20 ... Motor Main shaft, 25 ... gripping body part, 29 ... continuous curved surface part, 30 ... storage space, 31 ... projecting wall, 33 ... front main body part, 35 ... processing tool, 36 ... transmission gear device, 41 ... guide wall

Claims (6)

Between the driving part (3) having the motor (2) at the rear and the head part (5) having the processing part (4) for processing the processed part at the front, the driving force of the motor (2) is A hand-held power tool (1) provided with a gripping part (7) with a built-in transmission shaft (6) for transmission to the machining part (4) and used substantially horizontally by gripping the gripping part (7) There,
A hand-held power tool (1) characterized in that the center of gravity (G) of the hand-held power tool (1) exists in the gripping part (7).   The hand-held power tool (1) according to claim 1, wherein a switch (26) for operating the motor (2) is present on the lower surface of the gripping part (7).   The switch (26) is a push-button type that moves up and down, and is disposed on the lower front part of the gripping part (7). A projecting wall (31) projecting downward is formed behind the switch (26). The hand-held power tool (1) according to claim 2, wherein the power tool (1) is provided.   The hand-held power tool (1) according to claim 1, wherein the grip portion (7) is formed in an oblique shape with a front portion thereof lowered from a rear portion thereof.   A push button type switch (26) that moves up and down to operate the motor (2) is disposed on the front surface of the lower surface of the grip portion (7), and the main shaft (20) of the motor (2) extends in the front-rear direction. The hand-held power tool (1) according to claim 4, wherein the transmission shaft (6) is provided coaxially with the main shaft (20) of the motor (2).   The hand-held power tool according to claim 1, wherein the center in the width direction of the processing tool (35) provided in the processing section (4) exists on the center axis in the width direction of the gripping section (7) in plan view. (1).

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