JP6364646B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool having an apparatus main body provided with an electric motor and a battery pack attached to and detached from the apparatus main body.

  Conventionally, an electric tool having an apparatus main body provided with an electric motor and a battery pack attached to and detached from the apparatus main body is known, and an example of the electric tool is described in Patent Document 1. The electric tool described in Patent Document 1 is an impact wrench, and the electric tool is an apparatus main body provided with an electric motor, a battery pack that is detachable from the apparatus main body and supplies electric power to the electric motor, Have The battery pack includes a housing case that houses battery cells, and battery-side terminals connected to the battery cells. Further, a terminal insertion hole is provided in the housing case, and the battery side terminal is disposed in the terminal insertion hole. Furthermore, the storage case is made of synthetic resin, and a guide groove is provided in the storage case. The guide groove defines a direction in which the battery pack is attached to and detached from the apparatus main body.

  The apparatus main body has a grip part gripped by an operator and an attachment part provided continuously to the grip part, and the battery pack is attached to and detached from the attachment part. The mounting portion is made of synthetic resin, and a guide protrusion is provided on the mounting portion. The guide protrusion defines a direction in which the battery pack is attached to and detached from the apparatus main body. Then, when the guide projection and the guide groove of the housing case are aligned and the battery pack is moved in a direction approaching the apparatus main body, the battery pack is attached to the apparatus main body. Further, in the process of attaching the battery pack to the apparatus main body, the battery side terminal and the device side terminal are connected. And if the trigger provided in the grip part is operated, the electric power of a battery cell will be supplied to an electric motor and the output shaft of an electric motor will rotate.

  A reduction mechanism, a hammer, an anvil, and the like are provided inside the apparatus main body, and a socket as a tip tool is attached to the anvil. For this reason, the torque of the output shaft is transmitted to the tip tool via the speed reduction mechanism, the hammer, and the anvil, and the screw member is tightened. When the load for tightening the screw member increases, the hammer and the anvil move relative to each other in the rotation direction, and the hammer moves in the direction along the rotation axis, so that a striking force in the rotation direction is applied from the hammer to the anvil.

JP2013-63494A

  The electric power tool described in Patent Document 1 has a structure that determines a direction in which the battery pack is attached to and detached from the apparatus main body by sliding the guide protrusion along the guide groove. That is, there is a gap between the guide protrusion and the inner surface of the guide groove. For this reason, when the hammer's striking force is applied to the anvil and the apparatus main body vibrates, there is a possibility that the contact portion between the mounting portion and the housing case rubs and the mounting portion and the housing case are welded.

  The objective of this invention is providing the electric tool which can suppress that an apparatus main body and a battery pack weld.

The electric tool of an embodiment is an electric tool that operates a tip tool with the power of an electric motor, the electric motor is provided, and an apparatus main body that holds the tip tool, and is attached to and detached from the apparatus main body, A battery pack for supplying electric power to the electric motor; a guide portion provided in the apparatus main body and the battery pack; and a guide section for determining a moving direction when the battery pack is attached to and detached from the apparatus main body; And a power transmission mechanism that transmits the power of the electric motor to the tip tool, and the electric motor, the power transmission mechanism, and the battery pack serve as a rotation center of the electric motor. disposed on the axis, the movement preventing member and the device main body and the battery pack is restricted from relatively moving in a direction intersecting the moving direction, the apparatus main body or Provided in at least one of the battery packs, the device main body is a separate first component piece and second component piece, a fixing portion for fixing the first component piece and the second component piece to each other; The movement preventing member includes a first movement preventing member provided on the fixed portion.

An electric tool according to another embodiment is an electric tool that operates a tip tool with the power of an electric motor, the electric motor is provided, and an apparatus main body that holds the tip tool, and is attached to and detached from the apparatus main body. A battery pack that supplies power to the electric motor, a guide portion that is provided in the apparatus main body and the battery pack, and that determines a moving direction when the battery pack is attached to and detached from the apparatus main body, and the apparatus A power transmission mechanism that is provided in the main body and transmits the power of the electric motor to the tip tool, and the electric motor, the power transmission mechanism, and the battery pack serve as a rotation center of the electric motor. disposed on one axis, the movement preventing member and the device main body and the battery pack is restricted from relatively moving in a direction intersecting the moving direction, the apparatus main body also Provided on at least one of the battery pack, the movement preventing member includes a first movement preventing member, the movement direction of the battery pack is a direction intersecting the first axis.

  According to the present invention, when the power of the electric motor is transmitted to the tip tool to operate the tip tool and the device main body vibrates, the device main body and the battery pack relatively move in a direction intersecting the moving direction. Can be regulated. Therefore, it is possible to prevent welding between the apparatus main body and the battery pack.

It is side surface sectional drawing which shows Embodiment 1 of the electric tool of this invention. It is bottom sectional drawing which shows the mounting part of the electric tool shown in FIG. It is a perspective view which shows the mounting part of the electric tool shown in FIG. It is a perspective view of the battery pack shown in FIG. It is a top view of the battery pack of FIG. (A), (B) is the partial longitudinal cross-sectional view of the mounting part of the electric tool of this invention, and a battery pack. It is a partial side sectional view showing Embodiment 2 of the electric tool of the present invention.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. An electric tool 10 shown in FIG. 1 is a power tool using an electric motor 11 as a power source. The electric tool 10 can perform a plurality of different types of work by changing the tip tool to be attached. For example, when a tip tool having a sawtooth is attached to the power tool 10, the power tool 10 can perform an operation of cutting an object with the tip tool. Further, when a tip tool to which a diamond tip, a carbide tip or the like is fixed is attached to the power tool 10, the power tool 10 can perform an operation of grinding or polishing an object with the tip tool. Furthermore, when a scraper-shaped tip tool is attached to the electric power tool 10, an operation of peeling an object from an object with the tip tool can be performed. A power tool 10 shown in FIG. 1 is an example in which a scraper-shaped tip tool 12 is attached.

  The electric tool 10 includes an apparatus main body 13 provided with an electric motor 11 and a battery pack 14 that supplies electric power to the electric motor 11. The battery pack 14 can be attached to and detached from the apparatus main body 13. The apparatus main body 13 includes a cylindrical housing 15, and the electric motor 11 that is a power source is provided in the housing 15. A bracket 16 is provided in the housing 15, and the electric motor 11 is supported by the bracket 16. A mounting portion 17 is provided at one end in the longitudinal direction of the housing 15, and the battery pack 14 is attached to and detached from the mounting portion 17. The electric tool 10 can supply the electric power of the battery pack 14 to the electric motor 11.

  A main switch 18 is provided in the housing 15, and a lever 19 operated by an operator is provided on the outer wall of the housing 15. The lever 19 is movable along the outer wall of the housing 15. In addition, a link 20 that transmits an operating force applied to the lever 19 to the main switch 18 is provided in the housing 15. Further, a controller 21 is provided in the housing 15, and a speed adjustment dial 22 is provided in the housing 15. The speed adjustment dial 22 is a mechanism for setting a target rotational speed of the electric motor 11, and the speed adjustment dial 22 is operated by an operator. The controller 21 is connected to the speed adjustment dial 22 and the main switch 18.

  When the battery pack 14 is attached to the mounting portion 17, the power of the battery pack 14 can be supplied to the controller 21. Of the housing 15, the grip portion 23 is between the lever 19 and the mounting portion 17 in the direction along the first axis A, and the operator holds the grip portion 23 by hand. The first axis A is an imaginary line passing through the housing 15 and becomes the rotation center of the motor shaft 11a.

  On the other hand, a synthetic resin holder 24 is provided at the end of the housing 15 opposite to the mounting portion 17 in the direction along the first axis A. The holder 24 is fixed to the bracket 16. A tool holding shaft 27 is rotatably supported by the holder 24 via bearings 25 and 26. In FIG. 1 when the power tool 10 is viewed from the side, the second axis B of the tool holding shaft 27 is orthogonal to the first axis A of the motor shaft 11a. A tool holding portion 28 is provided at the tip of the tool holding shaft 27, and the tool holding portion 28 is disposed outside the housing 15.

  A power transmission mechanism 29 is provided in the holder 24. The power transmission mechanism 29 is a mechanism that converts the rotational force of the motor shaft 11a into a force that causes the tool holding shaft 27 to reciprocate within a predetermined angle range. The power transmission mechanism 29 includes a spindle 30 fixed to the motor shaft 11a. The spindle 30 is provided concentrically with the motor shaft 11 a, and the spindle 30 is rotatably supported by a bearing 31 attached to the bracket 16. The center line of the spindle 30 is coaxial with the first axis A of the motor shaft 11a, and the spindle 30 is provided with an eccentric shaft 30a. The center line of the eccentric shaft 30a is arranged at a position eccentric from the first axis A. An inner ring of a ball bearing 32 is attached to the outer peripheral surface of the eccentric shaft 30a.

  A swing arm 33 for connecting the outer ring of the ball bearing 32 and the tool holding shaft 27 is provided. The swing arm 33 is fixed to the tool holding shaft 27. The swing arm 33 is formed in a U shape having a pair of arm portions extending in parallel with the motor shaft 11a. The pair of arm portions are arranged at an interval equal to the outer diameter of the outer ring of the ball bearing 32. The pair of arm portions are in contact with the outer ring of the ball bearing 32. That is, the outer ring of the ball bearing 32 is sandwiched between the pair of arm portions. The tip tool 12 can be attached to and detached from the tool holding portion 28. The tip tool 12 is fixed to the tool holding portion 28 by a bolt 34.

  In the electric tool 10, when electric power is supplied to the electric motor 11 and the motor shaft 11a rotates in one direction, the spindle 30 and the motor shaft 11a rotate integrally. When the spindle 30 rotates, the eccentric shaft 30a and the ball bearing 32 revolve around the first axis A. When the ball bearing 32 revolves around the first axis A, the swing arm 33 reciprocates within a predetermined angle range with the tool holding shaft 27 as a fulcrum. For this reason, the tool holding shaft 27 repeats forward rotation and reverse rotation alternately within a predetermined angle range. In this way, the rotational force of the electric motor 11 is converted into the rotational force of the tool holding shaft 27.

  When the tool holding shaft 27 rotates forward and backward within a predetermined angle range, the tip tool 12 also reciprocates within the predetermined angle range, that is, vibrates around the tool holding shaft 27. Here, when the tooth of the tip tool 12 is pressed against the boundary between the object and the object, the tooth of the tip tool 12 bites between the object and the object, and a peeling operation is performed to remove the object from the object. Can do.

  Next, the positional relationship of each element provided in the housing 15 will be described. First, the electric motor 11 is disposed between the holder 24 and the mounting portion 17 in a direction along the first axis A. A power transmission mechanism 29 is provided between the electric motor 11 and the tool holding shaft 27 in the direction along the first axis A. Further, a controller 21 and a main switch 18 are provided between the electric motor 11 and the mounting portion 17 in a direction along the first axis A. Further, in FIG. 1 in which the electric tool 10 is viewed from the side, the arrangement area of the main switch 18 and the arrangement area of the controller 21 are on the first axis A.

  Further, in FIG. 1 in which the power tool 10 is viewed from the side, the tool holding shaft 27 is extended in a direction along a second axis B orthogonal to the first axis A, and a part of the mounting portion 17 is The tool holding shaft 27 is extended in the same direction with respect to one axis A. Furthermore, the housing 15 has the 1st component piece 15a and the 2nd component piece 15b which were comprised separately as FIG.2 and FIG.3. The housing 15 is divided into a first component piece 15a and a second component piece 15b on a plane including the dividing line C in FIG. The dividing line C is parallel to the second axis B, and the dividing line C and the first axis A are orthogonal. The first component piece 15a and the second component piece 15b are fixed to each other by tightening the screw member.

  FIG. 2 shows an example in which the first component piece 15a and the second component piece 15b are fixed by a screw member. The mounting portion 17 includes a wall 17a that separates the inside and the outside of the housing 15, and a boss portion 35 is provided on the wall 17a. The boss portion 35 protrudes from the wall 17 a toward the outside of the housing 15. The boss portion 35 has a protruding portion 35a formed on the first component piece 15a and a protruding portion 35b formed on the second component piece 15b. And the 1st component piece 15a and the 2nd component piece 15b are being fixed by connecting the two protrusion parts 35a and 35b with the screw member 36. FIG. Note that the side view of the electric power tool 10 means that the electric power tool 10 is viewed from a direction perpendicular to a plane including both the first axis A and the second axis B.

  When the operator operates the lever 19 and the main switch 18 is turned on, the electric power of the battery pack 14 is supplied to the electric motor 11 via the controller 21. The motor shaft 11a rotates. On the other hand, when the lever 19 is operated and the main switch 18 is turned off, the power of the battery pack 14 is not supplied to the electric motor 11 and the motor shaft 11a of the electric motor 11 stops. The motor shaft 11a is rotatable about the first axis A.

  Next, the configuration of the mounting portion 17 will be described with reference to FIGS. A terminal holder 37 is fixed to the wall 17 a of the mounting portion 17. The terminal holder 37 is interposed between the first component piece 15a and the second component piece 15b. When the housing 15 is viewed from the bottom, the first axis A is disposed between the boss portion 35 and the terminal holder 37 in the direction along the dividing line C. The terminal holder 37 is provided with a plurality of tool side terminals 38. The terminal holder 37 is made of synthetic resin, and the plurality of tool side terminals 38 are made of conductive metal. Note that the bottom view of the housing 15 means that the bottom surface including the dividing line C is viewed from the direction along the first axis A.

  2 and 3 show an example in which three tool-side terminals 38 are provided. The three tool side terminals 38 are connected to the controller 21 by electric wires. The three tool side terminals 38 have a plate shape, and the three tool side terminals 38 are exposed to the outside of the housing 15. When the housing 15 is viewed from the bottom, the three tool side terminals 38 are arranged in parallel to each other, and the three tool side terminals 38 are arranged in parallel to the dividing line C. Further, a pair of guide rails 39 are provided on the mounting portion 17. The pair of guide rails 39 are extended in the direction along the dividing line C, and the pair of guide rails 39 are parallel to each other. When the housing 15 is viewed from the bottom, the distance between the pair of guide rails 39 in the direction perpendicular to the dividing line C is wider than the width of the boss portion 35 in the direction perpendicular to the dividing line C.

  When the housing 15 is viewed from the bottom, the terminal holder 37 and the three tool side terminals 38 are disposed between the pair of guide rails 39. Further, guide grooves 40 are respectively provided between the pair of guide rails 39 and the wall 17a. The two guide grooves 40 are parallel to each other and parallel to the dividing line C. The pair of guide rails 39 and the two guide grooves 40 are guide portions that determine a moving direction when the battery pack 14 is attached to and detached from the mounting portion 17.

  When the housing 15 is viewed from the bottom, the arrangement range of the pair of guide rails 39 and the pair of guide grooves 40 in the direction along the dividing line C is wider than the arrangement range of the terminal holder 37. When the housing 15 is viewed from the bottom, the arrangement range of the pair of guide rails 39 and the pair of guide grooves 40 in the direction along the dividing line C and the arrangement range of the terminal holder 37 partially overlap. Further, when the housing 15 is viewed from the bottom, the arrangement range of the pair of guide rails 39 and the pair of guide grooves 40 in the direction along the dividing line C does not overlap with the arrangement range of the boss portion 35. Furthermore, the lock part 41 is provided in the edge part close | similar to the boss | hub part 35 in the length direction of a pair of guide rail 39, respectively.

  The configuration of the battery pack 14 will be described with reference to FIGS. 1, 4, and 5. The battery pack 14 includes a plurality of battery cells 42 and a housing case 58. The battery cell 42 is a secondary battery that can be repeatedly charged and discharged. The battery cell 42 includes a lithium ion battery cell, a nickel metal hydride battery cell, a lithium ion polymer battery cell, a nickel cadmium battery cell, and the like.

  A plurality of cylindrical battery cells 42 are arranged in parallel and held by a holder. For example, with four battery cells 42 as one set, a total of eight battery cells 42 in two sets are individually connected in series to obtain a voltage of 14.4V. Further, a circuit board is attached to the holder, and the circuit board is connected to the battery cell 42 via a power cord. A plurality of battery-side terminals 43 are provided on the circuit board. The battery side terminal 43 is made of a conductive metal material. The plurality of battery cells 42 and the circuit board are provided in the housing case 58. The housing case 58 includes a case body 44 and a cover 45 that covers the opening of the case body 44. Both the case body 44 and the cover 45 are separately formed of a non-conductive material, for example, a synthetic resin.

  On the other hand, the cover 45 is provided with a mount portion 46. In addition, guide rails 47 that are used when the battery pack 14 is attached to the mounting portion 17 are provided on both sides of the mount portion 46, respectively. The two guide rails 47 are arranged in parallel to each other. The cover 45 is provided with guide grooves 48 parallel to the two guide rails 47. The guide grooves 48 are parallel to each other.

  A plurality of terminal insertion holes 49 are provided between the two guide rails 47 in the mount portion 46. The plurality of terminal insertion holes 49 are parallel to the guide rail 47. Further, one battery-side terminal 43 is disposed in each of the plurality of terminal insertion holes 49 with the cover 45 attached to the case main body 44.

  Further, the cover 45 has two guide walls 50 that are continuous with the mount portion 46, and the two guide walls 50 rise from the mount portion 46. The guide walls 50 are connected to each other by a connection wall 50a, and a recess 51 is provided between the guide walls 50.

  Further, a button 52 is attached to the cover 45. The button 52 is operably attached to the cover 45, and the button 52 is provided with a latch 53. The cover 45 is provided with a hole, and the tip of the latch 53 is exposed to the outside of the cover 45 from the hole. When the battery pack 14 is attached to the attachment portion 17, the latch 53 is engaged with the lock portion 41.

  Next, an operation for attaching the battery pack 14 to the mounting portion 17 of the apparatus main body 13 will be described. As shown in FIG. 1, the battery pack 14 and the apparatus main body 13 are moved in parallel to bring the guide rail 39 of the mounting portion 17 into the guide groove 48 of the battery pack 14, and the guide rail 47 of the battery pack 14 is moved. Then, it is made to enter the guide groove 40 of the mounting portion 17. Then, the plurality of tool side terminals 38 enter the terminal insertion holes 49 one by one, and the tool side terminals 38 and the battery side terminals 43 are connected one by one.

  The relative movement direction of the battery pack 14 and the mounting portion 17 is regulated linearly by the guide rails 39 and 47 and the guide grooves 40 and 48. Further, the boss portion 35 of the mounting portion 17 enters the recess 51, and movement in a direction intersecting the guide rails 39 and 47 is restricted.

  When the lock portion 41 comes into contact with the latch 53, the latch 53 is elastically deformed toward the inside of the cover 45, and the latch 53 gets over the lock portion 41. Further, when the boss portion 35 comes into contact with the connection wall 50 a and the lock portion 41 comes into contact with the wall surface of the guide wall 50, the latch 53 returns to the original shape, and the lock portion 41 is hooked on the latch 53. For this reason, the battery pack 14 can no longer be detached from the mounting portion 17, and the work of attaching the battery pack 14 to the mounting portion 17 is completed. The operator operates the lever 19 in a state where the battery pack 14 is attached to the mounting portion 17 to switch the rotation or stop of the electric motor 11.

  On the other hand, when the battery pack 14 is attached to the mounting portion 17 and the main switch 18 is turned off, when the button 52 is pressed, the latch 53 is released from the lock portion 41. Next, the operator can remove the battery pack 14 from the apparatus main body 13 by relatively moving the battery pack 14 and the apparatus main body 13 in the opposite direction. The direction in which the battery pack 14 is attached to or detached from the mounting portion 17 of the apparatus body 13 is a direction that intersects the first axis A in FIG. Specifically, the direction in which the battery pack 14 is attached to or detached from the mounting portion 17 of the apparatus main body 13 is a direction orthogonal to the first axis A.

  The electric power tool 10 according to the present embodiment prevents the apparatus main body 13 from vibrating in a state where the battery pack 14 is attached to the mounting portion 17 of the apparatus main body 13 and relative movement between the battery pack 14 and the mounting portion 17. It has a movement prevention member. The vibration of the apparatus main body 13 is generated when electric power is supplied to the electric motor 11 and the tip tool 12 alternately repeats forward rotation and reverse rotation within a predetermined angle range with the tool holding shaft 27 as a fulcrum. That is, the vibration of the tip tool 12 is transmitted to the apparatus main body 13 and a load is applied to the mounting portion 17 to vibrate. The vibration direction of the mounting portion 17 is a direction along the arrow D in FIG. That is, the mounting portion 17 vibrates in a direction intersecting with the dividing line C, specifically, in a direction perpendicular to the dividing line C.

  The direction in which the vibration of the device body 13 is transmitted to the battery pack 14 and the battery pack 14 vibrates is the direction along the arrow D in FIG. The direction along the arrow D is a direction intersecting the first axis A and the second axis B in FIG.

  As shown in FIGS. 2, 3 and 6A, a pair of guide rails 39 is provided with grooves 39a, and two grooves 39a are provided with elastic bodies 54 as movement preventing members. ing. The two elastic bodies 54 have a rectangular parallelepiped shape, and the two elastic bodies 54 are press-fitted and fixed in the groove 39a. The two elastic bodies 54 are arranged at a position farthest from the boss portion 35 in the direction along the dividing line C in the pair of guide rails 39. Further, the two elastic bodies 54 are arranged at positions that are line-symmetric with respect to the dividing line C.

  2 and 3, the boss portion 35 is provided with two elastic bodies 55 as movement preventing members. The two elastic bodies 55 are attached to both ends of the boss portion 35 in the direction along the arrow D that is the vibration direction of the mounting portion 17. One elastic body 55 is press-fitted and fixed in the hole 56 of the protrusion 35a, and one elastic body 55 is press-fitted and fixed in the hole 57 of the protrusion 35b. The two elastic bodies 55 are arranged at positions to be lined with respect to the dividing line C.

  Further, the arrangement position of the two elastic bodies 54 in the direction along the dividing line C is different from the arrangement position of the two elastic bodies 55 in the direction along the dividing line C. Specifically, the first axis A is located between the arrangement position of the two elastic bodies 54 and the arrangement position of the two elastic bodies 55 in the direction along the dividing line C. The direction along the dividing line C is the moving direction of the battery pack 14 with respect to the mounting portion 17. The elastic bodies 54 and 55 are arranged on both sides of the first axis A in the direction along the dividing line C. . In other words, the elastic bodies 54 and 55 are arranged on both front and rear sides in the moving direction of the battery pack 14 relative to the mounting portion 17 with the first axis A interposed therebetween. The two elastic bodies 54 and the two elastic bodies 55 are formed of an elastomer, that is, a rubber-like elastic body. That is, the two elastic bodies 54 and the two elastic bodies 55 are made of a material having rigidity lower than that of the synthetic resin.

  In the state where the battery pack 14 is attached to the mounting portion 17, the two elastic bodies 54 are pressed against the inner surface of the guide groove 48 as shown in FIGS. 5 and 6A. That is, the mount portion 46 is sandwiched between the two elastic bodies 54 from both sides in the direction along the arrow D. As shown in FIG. 5, the two elastic bodies 55 are pressed against the surface of the guide wall 50 in the direction along the arrow D. For this reason, when the mounting portion 17 vibrates in the direction along the arrow D, the mounting portion 17 and the battery pack 14 can be prevented from relatively moving in the direction along the arrow D. Therefore, it is possible to prevent the contact portion between the mounting portion 17 and the cover 45 from being worn or welded by the frictional force.

  In particular, two elastic bodies 54 and two elastic bodies 55 are arranged at two different positions in the direction along the dividing line C. For this reason, it can prevent more reliably that the mounting part 17 and the battery pack 14 move relatively in the direction along the arrow D. Further, the elastic bodies 54 and 55 are arranged at two different positions with the first axis A in between in the direction along the dividing line C. The two positions are the upper and lower positions of the first axis A in FIG. Therefore, when the mounting unit 17 vibrates around the first axis A, that is, rotates within a predetermined angle range, it is possible to effectively suppress the relative movement between the mounting unit 17 and the battery pack 14.

  Furthermore, since the mounting portion 17 and the battery pack 14 can be prevented from relatively moving in the direction along the arrow D, the battery side terminal 43 and the tool side terminal 38 can be prevented from chattering.

  Another example of the movement preventing member attached to the mounting portion 17 will be described with reference to FIG. The elastic body 54 attached to the guide rail 39 has a pin shape, and a metal plate 59 is provided outside the elastic body 54 so as to surround the guide rail 39. The guide rail 39 is provided with a retaining groove 60 so that the plate 59 does not come off the guide rail 39. The plate 59 has a folded portion 59 a that is folded inward, and the tip of the folded portion 59 a is disposed in the retaining groove 60. That is, the folded portion 59 a is engaged with the guide rail 39.

  The plate 59 is urged toward the guide groove 48 by the elastic body 54. Since the plate 59 is made of metal and the cover 45 is made of synthetic resin, even if the plate 59 and the cover 45 are rubbed together, it is possible to suppress the welding of the plate 59 and the cover 45. Therefore, also in the electric tool 10 in which the elastic body 54 in FIG. 6B is attached to the mounting portion 17 in FIG. 1, the same effect as described above can be obtained.

(Embodiment 2)
Another example of the electric power tool 10 will be described with reference to FIG. In the electric tool 10 of FIG. 7, the battery pack 14 and the apparatus main body 13 are relatively moved in the direction along the first axis A, and the battery pack 14 is attached to and detached from the mounting portion 17. A wall 17a of the mounting portion 17 extends in the direction along the first axis A, and the mounting portion 17 is provided with a guide rail and a guide groove. The guide rail and the guide groove are extended in a direction along the first axis A.

  The mounting portion 17 is provided with two elastic bodies 54 and two elastic bodies 55. The two elastic bodies 54 and the two elastic bodies 55 are arranged at different positions in the direction along the first axis A. The other structure in the mounting part 17 of the electric tool 10 of FIG. 7 is the same as the structure of the mounting part 17 shown in FIGS. 1-3, FIG. The configuration of the battery pack 14 shown in FIG. 7 is the same as the configuration of the battery pack 14 shown in FIGS. 1, 4, and 5. In the electric tool 10 shown in the second embodiment, the direction in which the battery pack 14 is attached to and detached from the mounting portion 17 is a direction parallel to the first axis A.

  Also in the electric tool 10 shown in FIG. 7, even if the mounting portion 17 vibrates with the battery pack 14 attached to the mounting portion 17, the mounting portion 17 is provided with the elastic bodies 54 and 55. Similar effects can be obtained.

  The tool holding shaft 27 in this embodiment corresponds to the tool holding member of the present invention, the guide rails 39 and 47, the guide grooves 40 and 48, the boss portion 35, and the guide wall 50 correspond to the guide portion of the present invention. The boss portion 35 corresponds to the fixing portion of the present invention.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the electric power tool of the present invention includes a structure for attaching the movement preventing member to the apparatus main body and a structure for attaching to the cover of the battery pack. Moreover, the electric tool of the present invention includes a structure for attaching the movement preventing member to both the apparatus main body and the cover of the battery pack. Further, the movement preventing member can be fixed to the apparatus main body or the cover with an adhesive. The movement prevention member in the present invention may be provided at a plurality of different places in the moving direction of the battery pack, and the present invention is provided with the movement preventing member at three or more different places in the moving direction of the battery pack. Includes structure.

  The power tool of the present invention includes a grinder in which a grindstone as a tip tool is attached to the output shaft. When the electric tool is a grinder, a pinion gear is attached to the motor shaft, and a ring gear is attached to the output shaft. The pinion gear is meshed with the ring gear. Therefore, the motor shaft rotates in one direction, and the output shaft also rotates in one direction. The pinion gear and the ring gear are speed reduction mechanisms.

  DESCRIPTION OF SYMBOLS 11 ... Electric motor, 12 ... Tip tool, 13 ... Apparatus main body, 14 ... Battery pack, 15a ... 1st component piece, 15b ... 2nd component piece, 27 ... Tool holding shaft, 29 ... Power transmission mechanism, 35 ... Boss part , 39, 47 ... guide rail, 40, 48 ... guide groove, 50 ... guide wall, 54, 55 ... elastic body, A ... first axis, B ... second axis.

Claims (10)

An electric tool for operating a tip tool with the power of an electric motor,
An apparatus main body provided with the electric motor and holding the tip tool;
A battery pack that is attached to and detached from the apparatus main body and supplies power to the electric motor;
A guide portion that is provided in the device main body and the battery pack, and that determines a moving direction when the battery pack is attached to and detached from the device main body;
A power transmission mechanism provided in the apparatus main body and transmitting power of the electric motor to the tip tool;
Have
The electric motor, the power transmission mechanism, and the battery pack are disposed on a first axis that is a rotation center of the electric motor,
A movement preventing member for restricting relative movement of the apparatus main body and the battery pack in a direction intersecting the movement direction is provided in at least one of the apparatus main body or the battery pack,
The apparatus main body is
Separate first and second component pieces; and
A fixing portion for fixing the first component piece and the second component piece to each other;
With
The said movement prevention member is an electric tool containing the 1st movement prevention member provided in the said fixing | fixed part. An electric tool for operating a tip tool with the power of an electric motor,
An apparatus main body provided with the electric motor and holding the tip tool;
A battery pack that is attached to and detached from the apparatus main body and supplies power to the electric motor;
A guide portion that is provided in the apparatus main body and the battery pack, and determines a moving direction when the battery pack is attached to and detached from the apparatus main body;
A power transmission mechanism provided in the apparatus main body and transmitting power of the electric motor to the tip tool;
Have
The electric motor, the power transmission mechanism, and the battery pack are disposed on a first axis that is a rotation center of the electric motor,
A movement preventing member for restricting relative movement of the apparatus main body and the battery pack in a direction intersecting the movement direction is provided in at least one of the apparatus main body or the battery pack, and the movement preventing member is Including a first movement preventing member;
The power tool, wherein the battery pack moves in a direction intersecting the first axis.   The electric tool according to claim 1, wherein a tool holding member that is rotatable about a second axis that intersects the first axis and that holds the tip tool is provided in the apparatus main body. .   4. The power transmission mechanism according to claim 3, wherein the power transmission mechanism converts the rotational force of the electric motor into a force that alternately and normally rotates the tip tool within a range of a predetermined angle around the second axis. Electric tool.   The electric tool according to claim 1, wherein the movement preventing member is provided in the guide portion. The said movement prevention member contains the 2nd movement prevention member provided in the location different from a said 1st movement prevention member in the movement direction of the said battery pack. The electric tool described. The power tool according to claim 1, wherein a moving direction of the battery pack is a direction parallel to the first axis. The power tool according to claim 6 , wherein the first movement preventing member and the second movement preventing member are provided on both sides of the first axis. The first movement preventing member is provided on one side of the first axis in the movement direction ,
The power tool according to claim 6 , wherein the second movement preventing member is provided on the other side of the first axis in the movement direction .   The power tool according to claim 1, wherein the movement preventing member is an elastic body.

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