JP2016097498A - Impact tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact tool which enables a side handle to be used without hindering compactification and deteriorating the illumination function even if an illumination light is located at the lower surface side of a hammer case.SOLUTION: An impact wrench 1 includes: a brushless motor; a hammer rotated by the brushless motor; an anvil 4 hit by the hammer in a rotation direction; and a hammer case 9, which houses the hammer, in a body 2. A band 91 of a side handle 90 is fastened to a bearing part 61 of the anvil 4 which is formed at a front end of the hammer case 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an impact tool such as an impact driver or an impact wrench.

  An impact tool such as an impact driver and impact wrench includes a motor, a spindle that rotates as the motor is driven, and a hammer that is cam-coupled to the spindle. Is engaged with the anvil which is the final output shaft that is pivotally supported at the front end of the hammer case, and when the anvil torque increases, the rotation of the spindle is converted into intermittent hammering force (impact) of the hammer. Can be granted to anvils. A side handle can be attached to the hammer case by winding a side handle attachment band, and the operator supports the handle extending downward from the main body with one hand, and the other The side tool is held by the hand to support the impact tool (for example, Non-Patent Document 1).

Makita General Catalog 2014-10, Impact Wrench TW1000, [Searched on November 17, 2014], Internet <URL: http://www.makita.co.jp/product/ecatalog/sougou/index_f.html#30>

  In such an impact tool, the hammer case is formed in a tapered shape or a bell shape. Therefore, it is necessary to lengthen the entire length of the hammer case in order to wind the side handle mounting band. It becomes an obstacle. In addition, if a light for illumination is provided on the lower surface side of the hammer case, the mounting band interferes with the light of the light and deteriorates the illumination function.

  Therefore, the present invention has an object to provide an impact tool that can use the side handle without deteriorating the illumination function even if there is an illumination light on the lower surface side of the hammer case without hindering downsizing. It is what.

In order to achieve the above object, the invention described in claim 1 includes a motor, a hammer rotated by the motor, an anvil which is struck in the rotation direction by the hammer, and a hammer case which accommodates the hammer. The impact tool is characterized by having a side handle fixed to the front end of the hammer case.
In order to achieve the above object, the invention described in claim 2 includes a motor, a hammer rotated by the motor, an anvil that is struck in the rotation direction by the hammer, and a hammer case that houses the hammer. The impact tool is characterized in that it has a side handle for gripping and fixing a hammer case partially from above.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the hammer case holds a bearing that pivotally supports the anvil, the side handle tightens the clamp portion, and the hammer case tightens the clamp portion. And a bearing is disposed on the inner peripheral side of the clamped portion.
According to a fourth aspect of the present invention, in the configuration of the third aspect, the clamp portion is a band whose inner diameter can be enlarged or reduced, and the band is tightened by winding the clamped portion. .
According to a fifth aspect of the present invention, in the configuration of the third aspect, the clamp portion is composed of a first arm portion and a second arm portion that can be brought into contact with and separated from each other, and is covered by the first arm portion and the second arm portion. The clamp is gripped from above.
The invention described in claim 6 is a rechargeable impact tool including a rechargeable battery serving as a power source, and is provided with a side handle.
A seventh aspect of the invention is characterized in that, in the configuration of the sixth aspect, the maximum torque is 1000 Nm or more.
The invention described in claim 8 is characterized in that, in the configuration of claim 6 or 7, the weight including the rechargeable battery is 3.6 kg or more.

According to the present invention, the front end of the hammer case and the side handle for fixing the hammer case by partially grasping the hammer case from above are provided, so that the downsizing is not hindered and the lower side of the hammer case is used for illumination. The side handle can be used without deteriorating the lighting function even if there is a light.
According to the third aspect of the present invention, in addition to the above effect, the portion where the anvil bearing is disposed is the clamped portion, so that the side handle can be attached to the clamped portion having a small diameter, and the side handle Even if the handle is attached, the protruding portion is reduced and the handling is excellent.
According to the fourth aspect of the invention, in addition to the effect of the third aspect, since the clamp portion is a band whose inner diameter can be expanded and contracted, the reliability at the time of tightening to the hammer case is increased.
According to the fifth aspect of the invention, in addition to the effect of the third aspect, the clamped portion is gripped from the upper side by the first arm portion and the second arm portion, so that the large-diameter portion of the hammer case can be obtained. However, the side handle can be mounted without projecting downward.

It is a perspective view of the impact wrench of form 1. It is a disassembled perspective view of the side handle and impact wrench of form 1. It is a rear view of the impact wrench of form 1. It is a longitudinal cross-sectional view of the impact wrench of form 1. It is a top view (a part is shown with a horizontal cross section) of the impact wrench of form 1. It is the sectional view on the AA line of FIG. It is a perspective view of the impact wrench of form 2. It is a disassembled perspective view of the side handle and impact wrench of form 2. It is a rear view of the impact wrench of form 2. It is a longitudinal cross-sectional view of the impact wrench of form 2. It is the BB sectional view taken on the line of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
FIG. 1 is a perspective view of an impact wrench, which is an example of an impact tool, FIG. 2 is an exploded perspective view of a side handle and an impact wrench, FIG. 3 is a rear view, and FIG. The impact wrench 1 has a body 2 extending in the front-rear direction and has a T-shape in a side view in which a handle 3 is formed downward. An anvil 4 serving as a final output shaft projects from the tip of the body 2, and a lower end of the handle 3 A battery pack 6 that houses a plurality of rechargeable batteries serving as a power source is mounted on the mounting portion 5 provided in FIG.
The housing of the main body 2 includes a synthetic resin main body housing 7 with a handle 3 extending in the rear part for accommodating the brushless motor 8, and a metal hammer case assembled in front of the main body housing 7 to accommodate the striking mechanism 10. Nine. The main body housing 7 is formed by assembling a pair of left and right half housings 7a, 7b with screws 11, 11,.

  In the main body housing 7, behind the hammer case 9, a gear housing 12 made of a metal that is fitted to the rear end of the hammer case 9 and has a rearward convex shape, as shown in FIG. .. Are held by holding ribs 13, 13.. The ribs 14 provided on the outer periphery of the gear housing 12 are projected so as to be located at the corners of the rectangular shape in front view on the outer surface of the front end of the main body housing 7, and the rear bosses 15, 15. By being positioned between the front bosses 16, 16... Projecting so as to be located at the corners of the rectangular shape in front view on the outer surface of the end, and connecting from the rear with four bolts 17, 17. The main body housing 7, the gear housing 12, and the hammer case 9 are integrated. By screwing the bolts 17 into the metal hammer case 9 in this manner, the main body housing 7 and the hammer case 9 are firmly coupled, and durability is improved. Further, since the main body housing 7 is formed by the half housings 7a and 7b, internal wiring can be easily performed.

In the main body 2, a brushless motor 8, a spindle 18, a striking mechanism 10, and an anvil 4 that are power transmission elements are arranged in order from the rear.
First, the brushless motor 8 is an inner rotor type composed of a stator 19 and a rotor 20 inside thereof, and the stator 19 is formed on a cylindrical stator core 21 formed of a plurality of laminated steel plates and end faces in the axial direction of the stator core 21. Each includes a front insulator 22 and a rear insulator 23 provided, and six coils 24, 24... Wound around the stator core 21 via the front and rear insulators 22 and 23. The rear insulator 23 includes a sensor circuit board 25 on which three rotation detection elements (not shown) for detecting the position of the permanent magnet 35 provided on the rotor 20 and outputting a rotation detection signal are mounted, and a coil wound by one A short-circuit member 26 including three sheet metal members 28 for short-circuiting the fusing terminals 27 fusing the windings 24 and 24 diagonally is attached. By this short-circuit member 26, the coil 24 is delta-connected in a para-winding manner.

  The stator 19 is held at the outer periphery thereof by supporting ribs 29 and 29 projecting in the circumferential direction on the inner surfaces of the half housings 7a and 7b of the main body housing 7 and projects on the inner surfaces of the half housings 7a and 7b. The provided projections (not shown) are respectively fitted into recesses (not shown) formed on the side surface of the rear insulator. Each support rib 29 is provided with left and right plate ribs 29 a, 29 a that protrude downward with a predetermined interval in the front-rear direction and have a tip close to the inner surface of the main body housing 7. The plate ribs 29a are drawn from the sensor circuit board 25 to transmit a rotation detection signal of the rotor 20 to a control circuit board 78 to be described later, and lead wires (not shown) are drawn from the short-circuit member 26 to each sheet metal from the control circuit board 78. A lead wire (not shown) for supplying electric power to the coil 24 through the member 28 and the fusing terminal 27 is guided along the inner surface of the main body housing 7.

The lower portion of the main body housing 7 close to the lower end of the plate rib 29a is gently raised and inclined as it goes rearward from the continuous portion of the handle 3 at a position away from the brushless motor 8 to grip the handle 3. In this case, the hand receiving portion 7c is brought into contact with the hand from above and can support the rear portion of the main body housing 7 by hand.
In addition, the front protrusions 31 projecting from the inner surfaces of the half housings 7a and 7b are engaged with the recesses 30 provided on the left and right sides of the outer periphery of the front insulator 22 to contact the front surface of the stator core 21, and the rear protrusions 32 are short-circuited. It contacts the rear surface of the member 26. Thus, the stator 19 is accommodated in the main body housing 7 while being positioned in the axial direction and the circumferential direction.

  On the other hand, the rotor 20 is disposed around the rotation shaft 33, the substantially cylindrical rotor core 34 formed by laminating a plurality of steel plates, and 4 fixed to the inside of the rotor core 34. And two plate-like permanent magnets (sintered magnets) 35, 35. The rear end of the rotary shaft 33 is pivotally supported by a bearing 36 held at the rear portion of the main body housing 7, and the front end is pivotally supported by a bearing 37 held by the gear housing 12, so that the front end where the pinion 38 is formed is formed. Projecting forward of the gear housing 12. A centrifugal fan 39 is attached to the rear portion of the bearing 37 on the rotating shaft 33. Reference numeral 40 denotes an exhaust port formed on the left and right side surfaces of the main body housing 7 at the position of the centrifugal fan 39, and 41 denotes an intake port provided on the rear surface of the main body housing 7 (FIG. 3).

  Further, in the rotor 20, a front stopper 42 is provided between the rotor core 34 and the centrifugal fan 39. The front stopper 42 is a disc made of brass and having the same outer diameter as the rotor core 34, and is fixed to the rotary shaft 33 coaxially with the rotor core 34. On the other hand, a rear stopper 43 is provided on the inner side of the sensor circuit board 25 between the rotor core 34 and the rear bearing 36. After this, the stopper 43 is a disc made of brass and having an outer diameter smaller than that of the rotor core 34, and is fixed to the rotary shaft 33 in a state of being coaxial with the rotor core 34 and having a gap between the rotor core 34. However, the outer diameter of the rear stopper 43 is larger than the inner circle surrounded by the four permanent magnets 35, and the rear stopper 43 is positioned behind each permanent magnet 35.

  The spindle 18 and the striking mechanism 10 are accommodated in a space surrounded by the hammer case 9 and the gear housing 12. The spindle 18 integrally has a carrier portion 44 that holds three planetary gears 45, 45,... At the rear portion, a bottomed hole 46 is formed at the rear end shaft center, and a small diameter portion 47 is formed at the front end. ing. In the hammer case 9, the spindle 18 is pivotally supported by a bearing 48 whose rear end is held by the gear housing 12, and the planetary gear 45 meshes with an internal gear 49 held by the gear housing 12 in front of the spindle 18. And the small diameter part 47 of a front end is coaxially inserted in the insertion hole 50 provided in the axial center of the anvil 4, and is supported so that rotation with the rotating shaft 33 is coaxial. In this state, the pinion 38 of the rotating shaft 33 is inserted into the bottomed hole 46 from behind and meshes with each planetary gear 45 at the center of the three planetary gears 45.

  The striking mechanism 10 includes a hammer 51 mounted on the front portion of the spindle 18, balls 52 and 52 provided between the hammer 51 and the spindle 18, and a coil spring 53 that urges the hammer 51 forward. The The hammer 51 has a pair of claws 54, 54 on the front surface and can be engaged with a pair of arms 55, 55 provided at the rear end of the anvil 4 in the rotational direction. The spindle 18 and the hammer 51 are integrated in the rotation direction by straddling and fitting between the V-shaped cam groove 56 provided on the inner surface of the hammer 51 and the chevron groove 57 provided on the inner peripheral surface of the hammer 51. However, relative rotation and back-and-forth movement of the hammer 51 are allowed in the rolling range of the ball 52 with respect to the cam groove 56. The coil spring 53 is externally mounted on the spindle 18 and the front end thereof is inserted into a ring groove 58 provided on the rear surface of the hammer 51, while the rear end is brought into contact with the front surface of the carrier portion 44. The cam groove 56 is biased to the forward position located at the center of the front end and the center of the rear end of the angle groove 57.

  The hammer case 9 includes a large-diameter portion 59 that extends slightly forward of an extension portion 76 that will be described later, a tapered portion 60 that tapers forward from the large-diameter portion 59, and a small-diameter bearing portion 61 that extends forward from the tapered portion 60. A ring-shaped flat surface 62 orthogonal to the axis of the bearing portion 61 is formed at the connecting portion between the tapered portion 60 and the bearing portion 61. Further, front and rear direction stoppers 63, 63... Are integrally formed at a predetermined interval in the circumferential direction of the bearing portion 61 from the flat surface 62 to the outer periphery of the rear end of the bearing portion 61. The stopper 63 acts as a heat-dissipating protrusion of the hammer case 9 when a side handle 90 described later is not attached. Further, on the left and right sides of the hammer case 9, the upper and lower front bosses 16, 16 are continuous by a thick convex portion 64 whose center in the vertical direction protrudes forward, and at the rear of the convex portion 64, the main housing 7 The left and right projecting pieces 65, 65 projecting forward beyond the rib 14 of the gear housing 12 are superposed.

  The anvil 4 is pivotally supported coaxially with the spindle 18 by a bearing metal 66 held by the bearing portion 61, and is positioned forward by a restriction ring 67 provided between the bearing portion 61 and the arms 55 and 55. Yes. In the anvil 4, a grease reservoir 68 extending forward to the inside of the bearing metal 66 extends in the insertion hole 50 into which the small diameter portion 47 of the spindle 18 is inserted, and a ring-shaped guide groove 69 is provided on the outer periphery of the anvil 4. Is formed in a recess, and the grease reservoir 68 and the guide groove 69 are connected by a grease supply hole 70 in the radial direction. As a result, the grease in the grease reservoir 68 is supplied to the guide groove 69 through the grease supply hole 70 so as to achieve lubrication between the bearing metal 66 and the anvil 4. Reference numeral 71 denotes a seal ring provided between the bearing portion 61 and the anvil 4 in front of the bearing metal 66, and a mounting portion 72 having a rectangular cross-section to which a socket (not shown) is fitted is attached to the tip of the anvil 4. Is formed.

  On the other hand, at the upper part of the handle 3, a switch 73 with a trigger 74 protruding forward is provided, and a forward / reverse switching button 75 of the brushless motor 8 is provided. Above the trigger 74, the main body housing 7 is formed with an extending portion 76 that covers the lower surface of the hammer case 9 and protrudes forward from the trigger 74. LEDs 77 and 77 are provided as illumination lights for irradiation. By providing two LEDs 77 in this way, the irradiation range is widened, and even if a large socket is attached to the anvil 4, illumination of the work site can be performed without any trouble.

  The mounting portion 5 accommodates a control circuit board 78 that is held by a dish-like case 79 and on which a switching element for controlling the brushless motor 8 and a microcomputer are mounted. The control circuit board 78 is provided with a switch panel 80 having a hitting force switching button, a battery remaining capacity display lamp, and the like, and is exposed through a window 81 provided in the front portion of the mounting portion 5. The lower part of the handle 3 and the mounting part 5 are connected by assembling the left and right halves 5a and 5b forming the mounting part 5 to the connecting part 82 protruding from the lower end of the handle 3 and fixing them with screws 83 and 83. Is done. An elastic member 84 is interposed between the connecting portion 82 and the mounting portion 5 so as to mitigate the impact and vibration transmitted from the handle 3 to the mounting portion 5. One end of a hanging hook 85 whose front view is U-shaped is fixed to the left half portion 5 a with a screw 86.

  The battery pack 6 has a structure in which the rails are coupled to each other by sliding from the front with respect to the mounting portion 5, and the terminal plate of the terminal block 87 provided on the mounting portion 5 together with the coupling is a terminal on the battery pack 5 side. And electrically connected. Reference numeral 88 denotes a hook that is locked to the mounting portion 5 to prevent the battery pack 6 from being detached, and 89 is a release button for releasing the hook 88 when the battery pack 6 is removed.

  Then, a side handle 90 is attached to the outer periphery of the bearing portion 61 that is a clamped portion of the hammer case 9. The side handle 90 includes a band 91 as a clamp portion that fastens the bearing portion 61, a grip 92, and a bolt 93 that connects the band 91 and the grip 92. The band 91 is a band shape having a ring-like inner shape that substantially matches the outer diameter of the bearing portion 61, and an outer cylinder 94 and an inner cylinder 95 that are positioned in a straight line are integrally formed at both ends. Stopper grooves 96, 96... In which the stoppers 63, 63 of the bearing portion 61 can be fitted are formed on the inner periphery of the band 91 over substantially the entire circumference at the same interval as the stopper 63. Yes.

  The grip 92 has a hollow shape in which a flange 97 is formed on one end side, and an insertion portion 98 inserted into the inner cylinder 95 of the band 91 is coaxially provided at an end portion on the flange 97 side, A nut 99 is embedded inside. The bolt 93 passes through the outer cylinder 94 and the inner cylinder 95, passes through the axis of the grip 92, is screwed into the nut 99, and fits into the hexagonal recess 101 in which the hexagonal head 100 is recessed in the outer surface of the outer cylinder 94. As a result, the outer cylinder 94, the inner cylinder 95, and the grip 92 are connected while being prevented from rotating with respect to the outer cylinder 94 and the inner cylinder 95. Accordingly, when the grip 92 is rotated in the direction in which the bolt 93 is screwed into the nut 99 without the band 91 rotating, the outer cylinder 94 and the inner cylinder 95 are pressed toward the grip 92 by the hexagonal head 100, and the inner cylinder When 95 comes into contact with the end of the grip 92 and stops, the outer cylinder 94 and the inner cylinder 95 come close to each other, and the inner diameter of the band 91 is contracted. On the contrary, when the grip 92 is rotated in a direction in which the bolt 93 is removed from the nut 99, the pressing of the outer cylinder 94 and the inner cylinder 95 is released, and the inner diameter of the band 91 is expanded by allowing the movement in the separating direction. It becomes possible. Since the surface of the grip 92 made of resin is integrally covered with the thermoplastic elastomer 92a, vibration from the hammer case 9 is difficult to be transmitted to the hand through the grip 92.

  In the impact wrench 1 configured as described above, when the side handle 90 is mounted, the anvil 4 is inserted into the band 91 with the inner diameter of the band 91 expanded, and the band 91 is inserted into the hammer case 9 from the front. The bearing portion 61 is externally mounted. Then, the stopper 63 of the bearing portion 61 is fitted into the stopper groove 96 of the band 91, and the rear end surface of the band 91 is in contact with the flat surface 62 of the hammer case 9, so that rotation and rearward movement are restricted. Here, when the grip 92 is rotated and the band 91 is contracted, the band 91 tightens the bearing portion 61, and the side handle 90 is attached in a posture in which the grip 92 protrudes sideways above the bearing portion 61. Complete. Therefore, the operator can support the impact wrench 1 by holding the handle 3 with one hand and holding the grip 92 of the side handle 90 with the other hand. Note that the orientation of the grip 92 is the same even if it is reversed left and right, and the grip 92 can be positioned by fitting the stopper groove 96 and the stopper 63 even when the grip 92 is tilted upward or downward rather than laterally.

When the trigger 74 is pushed in with the hand holding the handle 3 in this state, the switch 73 is turned on and the brushless motor 8 is driven by the power supply of the battery pack 6. That is, the microcomputer of the control circuit board 78 obtains the rotation detection signal indicating the position of the permanent magnet 35 of the rotor 20 output from the rotation detection element of the sensor circuit board 25, acquires the rotation state of the rotor 20, and acquires the obtained rotation. The rotor 20 is rotated by controlling ON / OFF of each switching element according to the state, and passing current to each coil 24 of the stator 19 in order. Accordingly, the rotating shaft 33 rotates to cause the planetary gear 45 of the carrier portion 44 to perform a planetary motion, whereby the spindle 18 rotates at a reduced speed and the hammer 51 is rotated via the ball 52. It can rotate and tighten bolts with sockets.
Further, when the switch 73 is turned on, the control circuit board 78 turns on the LEDs 77 and 77 to irradiate the front of the socket. However, since the band 91 of the side handle 90 is wound around the small-diameter bearing portion 61, The handle 90 does not block the light of the LEDs 77 and 77, and the work site is reliably illuminated.

When tightening progresses and the torque of the anvil 4 increases, the hammer 51 moves backward while rolling the ball 52 along the cam groove 56 against the bias of the coil spring 53, and the claw 54 comes off the arm 55. When the ball 52 rolls forward along the cam groove 56 by the urging of the coil spring 53, the hammer 51 advances while rotating, the claw 54 is re-engaged with the arm 55, and the rotational hitting force is applied to the anvil 4. (Impact) is generated. Further tightening is performed by intermittently repeating this impact. The impact wrench 1 has a maximum torque of 1000 Nm, and the weight including the battery pack 6 is 3.6 kg. However, even if the torque and weight are large, the side handle 90 can provide stable support. It becomes. .
On the other hand, since the front and rear stoppers 42 and 43 are provided on the front and rear of the rotating rotor 20, the movement of the permanent magnets 35 in the front-rear direction is restricted and the rotor core 34 is prevented from coming off.

As described above, according to the impact wrench 1 of the first aspect, by having the side handle 90 fixed to the bearing portion 61 at the front end of the hammer case 9, the bottom surface of the hammer case 9 is prevented without hindering compactness. Even if there is an LED 77 for illumination on the side, the side handle can be used without deteriorating the illumination function.
In particular, here, since the bearing portion 61 that holds the bearing metal 66 is a clamped portion of the side handle 90, the side handle 90 can be attached to the small-diameter bearing portion 61, and the side handle 90 is attached. However, the protruding portion is reduced except for the grip 92, and the handleability is excellent.
Moreover, since the clamp part is the band 91 whose inner diameter can be expanded and contracted, the reliability when tightening to the hammer case 9 is increased.

In the first embodiment, the shape of the band can be changed as appropriate. The outer cylinder and the inner cylinder are separated from the band, and both ends of the band are engaged with the outer cylinder and the inner cylinder. The number and interval can be changed, or the rotation can be prevented by knurling the outer peripheral surface of the bearing portion and the inner peripheral surface of the band in place of the stopper and the stopper groove.
Further, it is not always necessary to fasten the band to the bearing portion, and the clamped portion by the band may be formed at a position shifted in the axial direction from the bearing of the anvil.

[Form 2]
Next, another embodiment of the present invention will be described. However, since the structure of the impact wrench 1 is the same as that of the form 1, only the form of the side handle will be described, and the same components will be denoted by the same reference numerals and redundant description will be omitted.
In the impact wrench 1 shown in FIGS. 7 to 11, the side handle 90 </ b> A is attached not to the bearing portion 61 of the hammer case 9 but to the large-diameter portion 59 serving as a clamped portion. The clamp portion of the side handle 90A has a pair of first arm portion 102 and second arm portion 103 having an inner shape that matches the shape from the upper half of the large-diameter portion 59 to the middle of the lower half, not the band shape. The first and second arm portions 102 and 103 are connected to the grip 92 via the connecting shaft 104. Grooves 105 into which the convex portions 64 provided on the large-diameter portion 59 can be fitted are recessed at the contact portions of the first and second arm portions 102 and 103 with the large-diameter portion 59.

The connecting shaft 104 is divided into a first shaft 106 that passes through the first and second arm portions 102 and 103, and a second shaft 107 that is fixed to the grip 92.
The first shaft 106 passes through the first and second arm portions 102 and 103 from the outside of the first arm portion 102, and the circular head portion 108 is prevented from coming off by the clip 109 in the first arm portion 102. The second arm portion 103 is spline-coupled at the spline portion 110 and is movable in the axial direction while being restricted in rotation. A screw part 111 is formed at the tip of the first shaft 106.
The second shaft 107 is inserted into the grip 92 and press-fitted into the embedded ring 118. The second shaft 107 is connected to the embedded portion 112 and protrudes from the end surface of the grip 92. The second shaft 107 protrudes from the end surface of the grip 92. It is connected to the first shaft 106 by screwing the screw portion 111 of the first shaft 106 to the female screw portion 114 in a state where the protruding portion 113 is inserted into the through hole 115 of the second arm portion 103. Has been. The tip of the protrusion 113 is in contact with the spline part 110 at the back of the through-hole 115 so that further insertion is restricted.

  Therefore, when the grip 92 is rotated in a direction in which the first shaft 106 is screwed into the female screw portion 114 of the second shaft 107 in a state where the first and second arm portions 102 and 103 are not rotated, the rotation is restricted by the spline portion 110. When the first shaft 106 is screwed into the second shaft 107, the first arm portion 102 is moved to the second arm portion 103 side. Since the movement of the second arm portion 103 toward the grip 92 is restricted by the protrusion 113 of the second shaft 107 coming into contact with the spline portion 110, the first and second arm portions 102 and 103 are close to each other. To do. Conversely, when the grip 92 is rotated in a direction in which the first shaft 106 is disengaged from the female screw portion 114 of the second shaft 107, the first shaft 106 is screwed to the outside, whereby the first and second arm portions 102 are moved. 103 are separated from each other. Left and right support bosses 116 and 116 are respectively provided on the rear surfaces of the first and second arm portions 102 and 103, and a guide pin 117 parallel to the connecting shaft 104 is provided between the support bosses 116 and 116. The both ends of the first and second arm portions 102 and 103 that are moved toward and away from each other are regulated by being inserted into both ends.

  In the impact wrench 1 configured as described above, when the side handle 90A is mounted, the first and second arm portions 102 and 103 are separated from each other with a large diameter at the position of the convex portion 64 of the hammer case 9. The first and second arm portions 102 and 103 are fitted from above the portion 59. If the grip 92 is rotated and the first and second arm portions 102 and 103 are brought close to each other, the first and second arm portions 102 and 103 fasten the large-diameter portion 59 from the left and right, and the grip 92 is The attachment of the side handle 90A is completed in a posture of projecting sideways above the hammer case 9. At this time, since the convex portions 64 and 64 of the hammer case 9 are fitted in the grooves 105 and 105 of the first and second arm portions 102 and 103, the rotation of the first and second arm portions 102 and 103 is restricted. The Therefore, the operator can support the impact wrench 1 by holding the handle 3 with one hand and holding the grip 92 of the side handle 90A with the other hand.

  When the trigger 74 is pushed, the control circuit board 78 turns on the LEDs 77 and 77 to irradiate the front of the socket, but the first and second arm portions 102 and 103 of the side handle 90A are almost the same as those of the hammer case 9. Since it is located on the upper side, the side handle 90A does not block the light of the LEDs 77 and 77, and the work site is reliably illuminated.

Thus, in the impact wrench 1 of the above-described form 2, the side handle 90A is used without impairing the illumination function even if there is an LED 77 for illumination on the lower surface side of the hammer case 9 without obstructing compactness. it can.
In particular, here, the clamp portion is formed of a first arm portion 102 and a second arm portion 103 that can be brought into contact with and separated from each other, and the large-diameter portion of the hammer case 9 is composed of the first arm portion 102 and the second arm portion 103. Since 59 is gripped from the upper side, the side handle 90 </ b> A can be mounted without protruding downward even for the large-diameter portion 59.

In the second embodiment, the shapes of the first arm portion and the second arm portion can be changed as appropriate. If the thickness of the lower surface side of the hammer case is small, the lower end can be extended to the lower side of the large diameter portion. . Further, the protrusion on the hammer case side to prevent rotation and the grooves on the first and second arm parts side may be reversed, or the engagement between a plurality of protrusions and depressions may be employed.
Further, the present invention is not limited to gripping the large-diameter portion of the hammer case, and the front end bearing portion can be gripped from the left and right by the first arm portion and the second arm portion as in the first embodiment.
In addition to the rotation prevention by the spline portion of the second arm portion, the connecting shaft can be screwed into the second shaft on the grip side with the first shaft having the hexagonal head fitted to the first arm portion as in the first mode. May be equal.

And, in common with the first and second embodiments, the impact tool is not limited to one having a maximum torque of 1000 Nm or more. For example, the range of 400 to 600 Nm, 600 to 800 Nm, 800 to 1000 Nm is the maximum torque. Also good. However, in the range of 800 to 1000 Nm, the effect of attaching the side handle is remarkable. The weight may be 3.6 kg or more, or may be a lightweight type such as 1.0 to 2.0 kg, 2.0 to 3.0 kg, 3.0 to 3.6 kg. However, in the range of 3.0 to 3.6 kg, the effect of mounting the side handle is remarkable.
In addition, an impact tool whose motor is not brushless, an impact tool using an AC power source, etc. may be used. Even if it exists, this invention is employable.

  1 ・ ・ Impact wrench 2 ・ ・ Main body 3 ・ ・ Handle 4 ・ ・ Anvil 5 ・ ・ Mounting part 6 ・ ・ Battery pack 7 ・ ・ Main body housing 8 ・ ・ Brushless motor 9 ・ ・ Hammer case 10 .... Blowing mechanism, 18 .... spindle, 19 .... stator, 20 .... rotor, 33 ... rotary shaft, 51 ... hammer, 59 ... large diameter part, 61 ... bearing part, 63 ... stopper , 64, convex portion, 66, bearing metal, 76, extension portion, 77, LED, 90, 90 A, side handle, 91, band, 92 grip, 93 bolt, 96 Stopper groove, 99, nut, 102, first arm, 103, second arm, 104, connecting shaft, 106, first axis, 107, second axis.

Claims (8)

A motor,
A hammer rotated by the motor;
An anvil struck in the direction of rotation by the hammer;
A hammer case containing the hammer, and an impact tool comprising:
An impact tool comprising a side handle fixed to a front end of the hammer case. A motor,
A hammer rotated by the motor;
An anvil struck in the direction of rotation by the hammer;
A hammer case containing the hammer, and an impact tool comprising:
An impact tool comprising: a side handle for gripping and fixing the hammer case partially from above. The hammer case holds a bearing that pivotally supports the anvil;
The side handle has a clamp part, and the hammer case has a clamped part to be fastened to the clamp part,
The impact tool according to claim 1, wherein the bearing is disposed on an inner peripheral side of the clamped portion. The clamp part is a band whose inner diameter can be enlarged or reduced,
The impact tool according to claim 3, wherein the band is tightened by winding the clamped portion. The clamp part is composed of a first arm part and a second arm part that can be brought into contact with and separated from each other.
The impact tool according to claim 3, wherein the clamped portion is gripped from above by the first arm portion and the second arm portion. A rechargeable impact tool equipped with a rechargeable battery as a power source,
Impact tool with side handle attached.   The impact tool according to claim 6, wherein the maximum torque is 1000 Nm or more.   The impact tool according to claim 6, wherein the weight of the impact tool including the rechargeable battery is 3.6 kg or more.

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