JP5029878B2 - Electric tool - Google Patents

Description

  The present invention relates to a power tool, and more particularly, to a power tool having an anti-vibration handle.

  Conventionally, an electric tool having an anti-vibration handle has been proposed. For example, an elastic means is interposed between one end portion of the main handle and the main body portion, and the main handle is provided so as to be rotatable in the direction from the main body portion to the one end portion around the other end portion. An electric tool is disclosed (for example, refer to Patent Document 1). Further, as another electric tool, another main handle connected to each other and a main body portion are provided, and the main body portion houses an electric motor and a reciprocating motion conversion portion for converting the rotational motion of the electric motor into a reciprocating motion. There is something that is. And the front-end | tip tool driven by the reciprocating motion of a reciprocating motion conversion part is attached to the front-end | tip of this edge part.

  The main handle has one end located on the upper side and the other end located on the lower side. The one end and the other end are each connected to the rear part of the main body. Elastic means are interposed between the one end and the main body. The other end portion is provided with a shaft, and the main handle is provided so as to be rotatable from the main body portion toward the one end portion around the shaft. The elastic means includes a first elastic support member, a second elastic support member, and a coil spring. The first elastic support member is fixed to the main body portion, and a first groove and a second groove communicating with the first groove are formed. The 1st groove | channel is formed so that it may extend along the front-back direction. The second groove is located behind the first groove, has a narrower width than the first groove, and opens behind the first elastic support member.

The second elastic support member is fixed to one end of the main handle. The second elastic support member is provided with a column part and a semi-cylindrical part. The column portion extends forward from the rear portion of the second elastic support member and penetrates through the second groove. The semi-cylindrical portion is provided at the tip of the column portion, has a width wider than the width of the second groove, and is disposed so as to be slidable relative to the first elastic support member in the first groove. The coil spring is disposed in the first groove and is interposed between the first elastic support member and the semi-cylindrical portion, and one end portion of the main handle is moved from the main body portion to the one end portion by the coil spring. It is energized.
JP 2005-74573 A

  In the above-mentioned electric power tool, it is preferable that the initial load of the coil spring, that is, the load applied to the coil spring in a non-working state is smaller, can absorb low vibration, and the initial load of the coil spring is preferably small. However, if the initial load of the coil spring is made small (the free length is shortened), the accuracy error may cause backlash. Conversely, to prevent rattling, the initial load has to be set large. Therefore, since the initial load of the coil spring is large in the initial state, the vibration in the low vibration region of the power tool cannot be absorbed well, and the workability is reduced.

  Accordingly, an object of the present invention is to provide an electric tool that can reduce an initial load applied to a spring in an initial state and can efficiently absorb vibration in a low vibration region.

In order to achieve the above object, the present invention is connected to the housing via a housing, a main handle disposed on the rear side of the housing, and a swinging shaft oriented substantially perpendicular to the front-rear direction of the housing. A sub handle capable of swinging with the swing shaft as a fulcrum, and an urging means for applying a resistance force in a direction against the swing of the sub handle, the outer periphery of the housing having a mounted portion, the the mounted portion mounting section is mounted, said sub-handle is connected to the unit with said mounting, can be positioned to an initial position to a predetermined angle each with respect to attachment portion in the rocking direction around the shaft rocking There, the sub-handle, Ri swingably der against the resistance force of the biasing means within a predetermined range relative to the positioning has been initial position, biasing means, said sub-handle-life該初To the sub handle to be in position It provides an electric tool that gives a resistance force.

Since the urging means for applying a resistance force in a direction against the swing of the sub handle is provided, vibration generated in the housing can be buffered. Therefore, vibration generated in the housing, can be suppressed from being transmitted to the sub-handle, thereby improving the operability of the power tool. Further, the outer periphery of the housing has a mounting portion, the mounting portion is mounted on the mounting portion, the sub handle is connected to the mounting portion, and the initial position with respect to the mounting portion in the swing direction about the swing shaft is positionable at a predetermined angle for each sub-handle swingably der is, the biasing means against the resistance force of the biasing means within a predetermined range relative to the positioning initial position, the sub-handle Since a resistance force is applied to the sub handle so that is positioned at the initial position, the electric tool can be used by changing the initial position to a desired position in the swing direction around the swing shaft.

Here, it is preferable that the attachment portion is attached so that the attachment position can be varied in the circumferential direction of the attachment portion, and the sub handle is connected to the attachment portion.

The mounting part is mounted so that the mounting position can be varied in the circumferential direction of the mounted part, and the sub handle is connected to the mounting part, so by changing the mounting position of the mounted part, the sub handle in the circumferential direction of the mounted part It is possible to use the electric tool by changing the position.

  The mounting portion has a clamp that surrounds the mounting portion and to which the sub handle is fixed. The sub handle is provided with a clamp tightening mechanism, and the clamp is tightened by the clamp tightening mechanism. It is preferable that the mounting position is fixed in the circumferential direction of the mounting portion, and the sub handle can be positioned at the desired initial position in the swinging direction about the swinging shaft with respect to the mounted portion.

  The mounting part has a clamp to which the attached part is mounted and the sub handle is fixed. Since the sub handle is provided with a clamp tightening mechanism, the clamp is tightened by the clamp tightening mechanism to surround the attached part. The attachment position can be fixed in the direction, and the sub handle can be positioned at a desired initial position in the swing direction about the swing axis with respect to the mounted portion.

  The urging means preferably has a knighthard spring. Since the urging means has a Knighthard spring, the spring load in the initial state can be reduced. For this reason, it is possible to effectively buffer the vibration in the low vibration region at the initial stage of the striking motion generated in the housing, and the workability of the electric tool can be improved.

  Here, the Knighthard spring has a substantially cylindrical outer frame portion whose outer shape is substantially a polygonal column shape and is fixed to the mounting portion, and an axial center which is oriented in parallel with the swinging shaft, so that the inner frame A cylindrical rubber rod disposed at each corner on the peripheral surface side, and a polygonal column portion having an axial center aligned with the swing axis and a corner disposed between the adjacent rubber rods; It is preferable to have a connecting portion that connects the sub handle and the polygonal column portion so as to be swingable integrally.

  The connecting portion is provided at a polygonal column uneven portion provided at an axial end of the polygonal column portion, and at a portion of the sub handle that is a part of the sub handle and faces the uneven portion. It is preferable to have an uneven portion that can be engaged with the polygonal column uneven portion.

  The swing shaft includes a bolt functioning as the connecting portion, and the bolt is a polygon in which a shaft portion and a cross section cut perpendicular to the axial direction of the bolt provided in the shaft portion form a polygonal shape. And a polygonal head portion, the polygonal portion penetrating through the polygonal column portion and detachable from the polygonal column portion and engaged with the polygonal column portion. The head can be engaged with and disengaged from the sub handle, and when the head is engaged with the sub handle, the head can rotate together with the sub handle, and the head of the bolt is engaged with the sub handle. It is preferable that the polygonal portion of the bolt engages with the polygonal column portion when mating.

  The swing shaft includes a bolt having a shaft portion and a head portion, and the knight hart spring is formed at an opening end of one end of a through hole formed in the sub handle so that the bolt can pass therethrough. A polygonal recess forming portion that defines a polygonal recess capable of accommodating and releasing the portion, and a cylinder whose axis is directed parallel to the swinging shaft and arranged at a corner on the inner peripheral surface side of the polygonal recess A rubber rod having a shape and a head having a polygonal shape and a corner disposed between adjacent rubber rods, and the head of the bolt is engaged with the polygonal recess through the rubber rod. It is preferable that the bolt can be fixed to the mounting portion so as not to rotate when the bolts are joined.

  And a motor housed in the housing, a tip tool attached to the distal end side of the housing, and a reciprocating motion converting portion for converting the rotation of the motor into a reciprocating motion, the reciprocating motion converting portion comprising: a cylinder; A piston slidably provided on the inner periphery of the cylinder, a motion converting unit that converts the rotational driving force of the motor into a reciprocating motion of the piston, and an impactor driven by the reciprocating motion of the piston. The tip tool is preferably driven by a reciprocating motion of the reciprocating motion converting portion.

  A motor housed in the housing, a tip tool attached to the tip end of the housing, and a reciprocating motion converting unit that converts the rotation of the motor into a reciprocating motion, the reciprocating motion converting unit sliding on the cylinder and the inner periphery of the cylinder. And a reciprocating motion of the piston, a movement converting portion for converting the rotational driving force of the motor into a reciprocating motion of the piston, and an impactor driven by the reciprocating motion of the piston. Since it is driven by movement, the vibration in the low vibration region generated by driving the striker in the initial stage of operation can be effectively buffered by the urging means, and the workability of the electric tool can be improved.

  The main handle is preferably connected to the housing via elastic means. With this configuration, vibration applied to the worker can be reduced more effectively.

  Further, it is more preferable that the elastic means has a knight hart spring. With this configuration, it is possible to more effectively reduce the vibration applied to the worker.

  As described above, the present invention can provide an electric tool that can reduce the initial load applied to the spring in the initial state and can efficiently absorb the vibration in the low vibration region.

  A first embodiment in which an electric power tool of the present invention is applied to an impact tool will be described with reference to FIGS. The left side in FIGS. 1 and 2 will be described below with the front end side of the impact tool 1 and the right side as the rear end side of the impact tool 1. The striking tool 1 includes a main handle 10, a sub handle 110, and a main body portion 60 including a motor housing 20 and a gear housing 30. The motor housing 20 and the gear housing 30 correspond to housings.

  As shown in FIG. 2, the main handle 10 is provided at the rear end of the housing, that is, the right end of the figure. The main handle 10 is attached with a power cable 11 and a switch mechanism 12 is built therein. A trigger 13 that can be operated by a user is mechanically connected to the switch mechanism 12. The power cable 11 is connected to an external power source (not shown) and operates the trigger 13 to switch between connection and disconnection of an electric motor 21 and an external power source, which will be described later. The main handle 10 also has a grip 14 that is gripped when the user uses the impact tool 1.

  Further, the main handle 10 has one end portion 10A located on the upper side and the other end portion 10B located on the lower side. The one end portion 10A is connected to the rear portion of the motion conversion housing 31 described later. An elastic means 50 is interposed between the one end 10 </ b> A and the motion conversion housing 31. The other end portion 10 </ b> B is connected to the rear portion of the motor housing 20. A rotation urging means 80 is interposed between the other end 10 </ b> B and the motor housing 20.

  The elastic means 50 and the rotation urging means 80 will be described with reference to FIGS. As shown in FIG. 4, the elastic means 50 is constituted by a transatly unit comprising a first elastic support member 51, a second elastic support member 52, and four round bar-shaped rubber elastic bodies 53. Yes. The first elastic support member 51 is fixed to the motion conversion housing 31, and is formed with an oval first groove 51a and a second groove 51b communicating with the first groove 51a. The first groove 51a is formed to extend along the front-rear direction. The second groove 51b is located behind the first groove 51a, has a narrower width than the first groove 51a, and opens behind the first elastic support member 51. In addition, first inclined surfaces 51 </ b> C are formed on both side walls of the first elastic support member 51.

  The second elastic support member 52 is fixed to one end portion 10 </ b> A of the main handle 10 by a bolt 54. The second elastic support member 52 is provided with a column part 52A and a columnar part 52B. The column part 52A extends forward from the rear part of the second elastic support member 52 and penetrates through the second groove 51b. The cylindrical portion 52B is provided at the tip of the column portion 52A, has a diameter longer than the width of the second groove 51b, and is disposed so as to be slidable relative to the first elastic support member 51 in the first groove 51a. ing. Therefore, the one end portion 10 </ b> A can be moved toward and away from the motion conversion housing 31. Further, since the diameter of the cylindrical portion 52B is longer than the width of the second groove 51b, the cylindrical portion 52B can be prevented from coming out of the first groove 51a and the second groove 51b, and the motion conversion housing 31 of the main handle 10 can be prevented. Separation beyond a predetermined distance from can be regulated.

  A second inclined surface 52C is formed on the inner wall of the second elastic support member 52 so as to extend in parallel with the first inclined surface 51C and to be separated from the first inclined surface 51C by a predetermined distance. The four elastic bodies 53 are interposed between the first inclined surface 51C and the second inclined surface 52C. Therefore, the main handle 10 and the motion conversion housing 31 are connected via the four elastic bodies 53. The elastic body 53 receives rolling friction between the second inclined surface 52C and the first inclined surface 51C when the second elastic support member 52 moves to the first elastic support member 51 side. Therefore, the elastic means 50 exhibits non-linear characteristics.

  As shown in FIGS. 3 and 5, the rotation urging means 80 is constituted by a knight hart spring comprising an outer frame 81, a shaft 82, a rotating member 83 having a substantially square cross section, and four rubber bars 84. ing. The rotation biasing means 80 corresponds to an elastic means. The outer frame 81 defines an internal space 81 a having a substantially square cross section and is fixed to the motor housing 20. The shaft 82 passes through the internal space 81 a and is fixed to the other end portion 10 </ b> B of the main handle 10 by a bolt 85. The main handle 10 is provided so as to be rotatable about a shaft 82. The rotating member 83 is fixed to the shaft 82 in the internal space 81 a and is provided so as to be rotatable together with the shaft 82. Therefore, when the main handle 10 is rotated, the shaft 82 rotates and the rotating member 83 also rotates. The four rubber bars 84 are an internal space 81 a and are interposed between the outer frame 81 and the rotating member 83.

  As shown in FIG. 1, the sub handle 110 is provided on a mounting portion having a substantially cylindrical shape that constitutes a tip portion of the gear housing 30. The sub handle 110 has a grip portion 111, and the grip portion 111 is connected to the distal end portion of the gear housing 30 via an attachment portion 120 having an annular portion 121. More specifically, as shown in FIG. 1, the sub handle 110 has a substantially square shape formed by connecting four rod-shaped portions of an upper portion 112, a lower portion 113, a right portion 114, and a left portion 115. Therefore, a part of the left part 115 in FIG. 1 forms a notch as shown in FIG. As shown in FIG. 7, a pair of notched surfaces 115A and 115A that define a notch are provided with uneven portions 115B that are radially formed with a through-hole 110a described later as a center. Yes. In FIG. 7, only one uneven portion 115B appears.

  The left portion 115 is formed with a through hole 110a extending in the extending direction of the left portion 115, that is, the vertical direction in FIGS. 1 and 6, and a bolt 116 is inserted into the through hole 110a. . The upper end of the through hole 110a forms a concave opening 110b having a hexagonal shape, and the head of a hexagonal bolt 116 is engaged. At the lower end of the left portion 115, a screw fastening portion 117 is formed that is screwed into the tip of the bolt 116 and has a through hole 117 a that can be screwed into the tip of the bolt 116 protruding from the lower end of the left portion 115. Yes. The screw tightening portion 117 corresponds to a clamp tightening mechanism.

  A biasing means 130 is provided between the pair of cutout surfaces 115A and 115A of the left portion 115 as shown in FIG. As shown in FIG. 8, the urging means 130 includes a cylindrical outer frame portion 131 whose outer shape forms a substantially quadrangular prism shape, and four columnar shapes arranged on the inner peripheral surface side of the outer frame portion 131. This is a Knight Hart spring having the rubber rods 132, 132, 132, 132 and the quadrangular column 133. The four rubber bars 132 are arranged on the inner peripheral surface of the outer frame portion 131 at the positions of the four corners so that the longitudinal direction thereof coincides with the longitudinal direction of the outer frame portion 131. As shown in FIG. 8, the quadrangular column portion 133 has its four corners positioned between the rubber rods 132 and 132 so that the longitudinal direction thereof coincides with the longitudinal direction of the rubber rod 132. Is arranged. A through-hole 133a is formed at the axial center position of the quadrangular column part 133, and the bolt 116 passes therethrough as shown in FIG. The quadrangular column part 133 corresponds to a polygonal column part.

  Around the through hole 133a, there are provided quadrangular column uneven portions 133A that are radially formed around the through hole 133a, and the quadrangular column uneven portions 133A and 113A are notches in the left portion 115 of the grip portion 111. It is possible to engage with the uneven portions 115B and 115B provided on the surfaces 115A and 115A. The rectangular column uneven portions 133A and 113A and the uneven portions 115B and 115B correspond to connecting portions.

  In FIGS. 7 and 8, only one quadrangular prism uneven portion 133 </ b> A appears. By rotating the screw tightening portion 117 and clamping the rectangular column portion 133 between the cutout portions of the left portion 115, the rectangular column uneven portion 133A and the uneven portion 115B are always engaged, and the quadrangular column portion 133 is engaged. On the other hand, the grip portion 111 becomes relatively unrotatable, and the initial position of the grip portion 111 with respect to the mounting portion 120 in the swing direction around the bolt 116 serving as the swing shaft is positioned. However, the biasing means 130 can be slightly swung in the swinging direction around the bolt 116 that is the swinging axis with the initial position as the center, and the vibration can be absorbed as will be described later.

  By rotating the screw tightening portion 117 to loosen the clamping that sandwiches the rectangular column portion 133 between the cutout portions of the left portion 115, the protruding portion of the uneven portion 115B can run on the protruding portion of the rectangular column uneven portion 133A. It becomes possible. For this reason, since the quadrangular prism concavo-convex part 133A can be rotated relative to the concavo-convex part 115B, the gripping part 111 can be rotated relative to the quadrangular column part 133 and the outer frame part 131, and the bolt The initial position of the grip portion 111 in the swinging direction centering on 116 can be changed.

  As shown in FIG. 6, the annular portion 121 of the attachment portion 120 is fixed to the outer frame portion 131 so as to surround the entire side surface. The annular portion 121 is connected to an annular housing mounting ring portion 122 whose axial center is oriented so as to be perpendicular to the axial direction of the bolt 116, and has a halved structure in the diametrical direction, with the connection position as the center. One is pivotable with respect to the other. Portions corresponding to the diameter direction of the connection positions can be coupled to each other by screws 123. When not connected to each other by the screw 123, one of the housing mounting ring portions 122 is rotated and opened with respect to the other, and the front end portion of the gear housing 30 is brought into contact with the inner peripheral surface of the housing mounting ring portion 122. One of the mounting ring portions 122 is rotated with respect to the other to close the halves to form an annular shape as shown in FIG. The rotational position of the mounting portion 120 in the circumferential direction of the housing 30 can be fixed.

  As shown in FIG. 6, the axis of the housing mounting ring 122 and the axial direction of the bolt 116 are perpendicular to each other, and the sub handle 110 swings around the bolt 116. It cannot swing in the direction, for example, the circumferential direction of the gear housing 30. Since the Knighthard spring is interposed between the sub handle 110 and the mounting portion 120, when the sub handle 110 is swung around the initial position with the bolt 116 as the swing axis, the initial position is positioned. In the sub handle 110, the side surface of the rectangular column portion 133 presses the rubber rod 132, and the urging force is received from the rubber rod 132 against the mounting portion 120 and the outer frame portion 131 fixed to the gear housing 30. , Subject to rolling friction. That is, an urging force is applied in a direction that opposes the swinging of the sub handle 110, and the urging means 130 exhibits non-linear characteristics and can effectively absorb vibrations from the gear housing 30 and the mounting portion 120. .

  As shown in FIG. 2, the motor housing 20 is provided at the lower end on the front end side of the main handle 10. The electric motor 21 is accommodated in the motor housing 20. The electric motor 21 includes an output shaft 22 that outputs the rotational driving force. A pinion gear 23 is provided at the tip of the output shaft 22 and is located in the gear housing 30.

  The gear housing 30 includes a motion conversion housing 31 and a striking housing 32. The motion conversion housing 31 is located in the upper part of the motor housing 20. The striking housing 32 is located on the distal end side of the motion converting housing 31.

  A crankshaft 34 extending in parallel with the output shaft 22 is rotatably supported in the motion conversion housing 31 on the rear end side of the pinion gear 23. A first gear 35 that meshes with the pinion gear 23 is coaxially fixed to the lower end of the crankshaft 34. A motion conversion mechanism 36 is provided at the upper end of the crankshaft 34. The motion conversion mechanism 36 includes a crank weight 37, a crank pin 38, and a connecting rod 39. The crank weight 37 is fixed to the upper end of the crankshaft 34. The crank pin 38 is fixed to the end of the crank weight 37. A crank pin 38 is inserted at the rear end of the connecting rod 39.

  A cylinder 40 extending in a direction orthogonal to the output shaft 22 is provided in the striking housing 32. The central axis of the cylinder 40 and the rotation axis of the output shaft 22 are located on the same plane. Further, the rear end portion of the cylinder 40 faces the electric motor 21. A tool holding portion 15 is provided on the tip side of the cylinder 40, and a tip tool 16 (FIG. 1) is detachably attached. The axial center direction of the tip tool 16 coincides with the front-rear direction of the housing. A piston 43 is provided in the cylinder 40 so as to be slidable on the inner periphery thereof. The piston 43 has a piston pin 43 </ b> A, and the piston pin 43 </ b> A is inserted at the tip of the connecting rod 39. A striking piece 44 is slidably provided on the inner periphery of the cylinder 40 at the tip end side in the cylinder 40. An air chamber 45 is defined in the cylinder 40 and between the piston 43 and the striker 44. Further, an intermediate element 46 is provided in the front end side of the striker 44 so as to be slidable in the front-rear direction in the cylinder 40.

  A counterweight mechanism 70 is disposed in the motion conversion housing 31 at a portion facing the main handle 10. The counterweight mechanism 70 includes two weight holding portion support portions 71 and 72, a weight holding portion 73, and a counterweight 74. Each weight holding part support part 71 and 72 is arrange | positioned so that the counterweight 74 may be pinched | interposed in the direction orthogonal to the direction of the reciprocating motion of piston 43. As shown in FIG. Each weight holding part support part 71, 72 is a first weight holding part support part 75, 76 and a second weight holding part support part 77, 78 located on the counter weight 74 side of the first weight holding part support part 71. And.

  Next, the operation of the impact tool 1 according to the first embodiment will be described. In a state where the main handle 10 is gripped by hand, the tip tool 16 is pressed against a work material (not shown). Next, the trigger 12 is pulled, and electric power is supplied to the electric motor 21 to rotate it. This rotational driving force is transmitted to the crankshaft 34 via the pinion gear 23 and the first gear 35. The rotation of the crankshaft 34 is converted into a reciprocating motion of the piston 43 in the cylinder 40 by the motion conversion mechanism 36 (crank weight 37, crankpin 38, and connecting rod 39). Due to the reciprocating motion of the piston 43, the pressure of the air in the air chamber 45 repeatedly rises and falls, giving a striking force to the striking element 44. The striking element 44 moves forward and collides with the rear end of the intermediate element 46, and the striking force is transmitted to the tip tool 16 via the intermediate element 46. By this striking force, a striking force is imparted to the tip tool 16, and the work material is crushed.

  During the operation of the hitting tool 1, vibration with a substantially constant period due to the reciprocating motion of the hitting element 44 is generated in the main body 60. A rubber rod 84 is interposed between an outer frame 81 fixed to the motor housing 20 and a rotating member 83 fixed to the other end 10 </ b> A, and the elastic body 53 is fixed to the motion conversion housing 31. Since it is interposed between the first elastic support member 51 and the second elastic support member 52 fixed to the one end portion 10A, the rubber rod 84 (rotation biasing means 80) and the elastic body 53 (elastic means) 50), vibration generated in the main body 60 can be buffered. Therefore, the vibration generated in the main body 60 can be suppressed from being transmitted to the main handle 10, and the workability of the electric power tool 1 can be improved.

  Further, since the rubber bar 132 is interposed between the outer frame part 131 and the square pillar part 133, the rubber bar 132 gives a resistance force in a direction that opposes the swinging of the sub handle 110. The generated vibration can be buffered. Therefore, it can suppress that the vibration which generate | occur | produces in the main-body part 60 is transmitted to the subn handle 110, and can improve the workability | operativity of the electric tool 1. FIG. Further, since the spring load of the rubber rod 84 and the rubber rod 132 in the initial state is small, the vibration in the low vibration region in the initial stage of the striking operation generated in the main body 60 can be effectively buffered by the rubber rod 84 and the rubber rod 132. The workability of the impact tool 1 can be improved.

  Further, the vibration generated in the main body 60 is transmitted to the weight holding portion support portions 71 and 72 via the motion conversion housing 31. The vibration transmitted to the weight holding portion support portions 71 and 72 is transmitted to the weight support member 73 and the counter weight 74, and the counter weight 74 vibrates in the same direction as the reciprocating motion direction of the piston 43. Due to this vibration, the vibration of the impact tool 1 due to impact is reduced.

  Next, a second embodiment in which the electric tool of the present invention is applied to an impact tool will be described. In the second embodiment, the rectangular column uneven portion 133A and the uneven portion 115B are not provided, and the notch surfaces 115A and 115A of the left portion 115 of the grip portion 111 and the end surface of the square column portion 1133 are in contact with each other in a plane. This is different from the first embodiment. Further, the bolt 1116 is different from the first embodiment in that the bolt 1116 cannot rotate with respect to the quadrangular prism 133 and is movable in the axial direction. Further, as shown in FIG. 9, the head portion of the bolt 1116 is not a hexagonal shape but an octagonal shape, and the concave opening 1110b of the left portion 115 of the gripping portion 111 has a shape similar to this. This is different from the first embodiment. Other configurations are the same as those in the first embodiment. Only the parts related to these differences will be described, and the same members will be described using the same reference numerals.

  The through hole 1133a of the quadrangular column 1133 has a polygonal columnar shape such as a quadrangular column in the cross section perpendicular to the axial direction, and the bolt 1116 passing through the through hole 1133a and the bolt above the portion. The portion 1116 has a cross-sectional shape substantially the same as that of the through hole 1133a except for the head portion of the bolt 1116. The lower part of FIG. 10 with respect to the square columnar part has a circular cross section as in the first embodiment. Therefore, as shown in FIG. 10, the quadrangular columnar portion 1133 is configured to be unrotatable with respect to the bolt 1116 by engaging the quadrangular columnar portion of the bolt 1116 with the through hole 1133 a.

  In addition, a portion of the through hole 1110a of the left portion 115 that is higher than the upper end of the quadrangular column portion 1133 in the drawing is larger in diameter than the quadrangular columnar portion of the bolt 1116, and the left portion 115 is centered on the axis of the bolt 1116. Can be rotated. Therefore, by loosening the bolt 1116 and moving it upward in FIG. 10, which is its axial direction, the head of the bolt 1116 is removed from the recessed opening 1110b, so that the bolt 1116, the square pillar 1133, and the mounting The left part 115 and the grip part 111 can swing with respect to the part about the bolt 1116 as a swing axis.

  When positioning the initial position of the grip portion 111 to a desired position, first, the screw tightening portion 117 is rotated to loosen the bolt 1116 and move in the axial direction, and the octagonal head of the bolt 1116 is moved to the grip portion 111. It is assumed that the left portion 115 is not engaged with the concave opening 1110b. Next, the gripping part 111 is swung with respect to the bolt 1116 at a desired position in increments of 45 ° such as 45 ° and 90 °. Then, the bolt 1116 is moved in the axial direction at that position, and the octagonal head of the bolt 1116 is engaged with the recess opening 1110 b of the left portion 115 of the grip portion 111. Then, by rotating the screw tightening portion 117 and tightening the bolt 1116 so that the octagonal head of the bolt 1116 does not come off from the recess opening 1110b of the left portion 115 of the gripping portion 111, the desired position can be obtained. The initial position of the grip part 111 can be positioned.

  The initial position of the gripping part 111 can be changed in 45 ° increments by making the head of the bolt 1116 and the recess opening 1110b of the gripping part 111 into an octagonal shape, but the number of corners is more than the octagonal shape. By using a polygonal shape with a large amount, the initial position can be changed with smaller angular increments.

  Next, a third embodiment in which the electric tool of the present invention is applied to an impact tool will be described. In the third embodiment, the attachment portion 2120 includes a housing attachment ring portion 2122 made of a thin annular plate-like member in which one opening serving as an opening is formed, and one of the openings in the joint is the outer frame portion 131. 11 is connected to the annular part upper part 2121A that wraps around the upper half of FIG. 11, and the other is connected to the annular part lower part 1212B that wraps around the lower half of FIG. 11 of the outer frame part 131, and the annular part upper part 2121A and the annular part lower part 2121B. The second embodiment is different from the first embodiment in that the annular portion 2121 is configured to mount the quadrangular prism portion 133 to form the clamp as the entire attachment portion 2120. Other configurations are the same as those in the first embodiment. In addition, about the same member, it demonstrates using the same code | symbol.

  When positioning the initial position of the grip portion 111 to a desired position, first, the screw tightening portion 117 is rotated to tighten the annular portion upper portion 2121A and the annular portion lower portion 2121B between the cutout portions of the left portion 115. At the same time, the rectangular column part 133 is clamped. As a result, the quadrangular prism concavo-convex portion 133A (FIG. 8) and the concavo-convex portion 115B (FIG. 7) are always engaged, and the initial position of the grip portion 111 in the swinging direction around the bolt 116 serving as the swinging shaft. Is positioned, and the front end of the gear housing 30 is tightened by the housing mounting ring portion 2122 so that the mounting portion 2120 is temporarily unable to rotate around the gear housing 30 with respect to the gear housing 30. Can be positioned.

  Next, a fourth embodiment in which the electric power tool of the present invention is applied to an impact tool will be described. In the fourth embodiment, the quadrangular column part 133, the outer frame part 131, and the four rubber rods 132 are not provided, and instead of the substantially cylindrical annular part 121, a solid bolt A solid annular portion in which a rectangular through-hole through which 3116 can pass is formed is provided, and the bolt 3116 has a quadrangular columnar portion 3116A from the middle as in the second embodiment. The portion 3116A is engageable with a hexagonal through hole in the solid annular portion, and the bolt 3116 is different from the first embodiment in that it cannot rotate with respect to the mounting portion 120. Moreover, it differs from 1st Embodiment by the point which has the knight Hart spring which is the urging | biasing means 3130 in the recessed part opening part 3110b (FIG. 12) of the left part 115 of the holding part 111. FIG. Other configurations are the same as those in the first embodiment. In addition, about the same member, it demonstrates using the same code | symbol.

  As shown in FIG. 12, the recessed portion opening 3110b of the left portion 115 of the grip portion 111 (FIG. 1 and the like) has a larger hexagonal shape than the head of the bolt 3116, and the inner peripheral surface of the recessed portion opening 3110b. In each of the corners, rubber rods 132 each having a diameter of 6 are arranged. The portion of the sub handle 111 that defines the recess opening 3110b corresponds to a polygonal recess forming portion, and the recess opening 3110b corresponds to a polygonal recess. The corners of the heads of the bolts 3116 are disposed between the adjacent rubber bars 132. The head portion and the shaft portion of the bolt 3116 are configured separately, and as shown in FIG. 12, a quadrangular columnar portion 3116A provided in the shaft portion is inserted into a through hole 3116a formed in the head portion. Thus, the head portion and the shaft portion are integrated.

  When positioning the initial position of the gripping part 111 to a desired position, first, the screw fastening part 117 (FIG. 6 and the like) is rotated to loosen the bolt 3116 and the bolt 3116 is moved in the axial direction to The grip part 111 is swung with respect to the bolt 3116 at a desired position by making the square head not in contact with the rubber bar 132. At that position, the bolt 3116 is moved in the axial direction, and the hexagonal head is inserted into the recess opening 3110b and brought into contact with the rubber bar 132. Then, by rotating the screw tightening portion 117 and tightening the bolt 3116 so that the hexagonal head of the bolt 3116 is always in contact with the rubber bar 132, the initial position of the gripping portion 111 is set at the desired position. Can be positioned.

  In the sub handle 110 in which the initial position is positioned, the hexagonal side of the head of the bolt 3116 presses the rubber rod 132, and the mounting portion 120 and the bolt 3116 fixed to the gear housing 30 are pressed. The rubber rod 132 receives an urging force and receives rolling friction. Therefore, the urging means 3130 exhibits a non-linear characteristic and can effectively absorb vibration from the gear housing 30 and the mounting portion 120.

  Next, a fifth embodiment in which the electric tool of the present invention is applied to an impact tool will be described with reference to FIG. The fifth embodiment is different from the first embodiment in that the grip portion 4111 has a bar shape. Other configurations are the same as those in the first embodiment. In addition, about the same member, it demonstrates using the same code | symbol.

  The sub handle 4110 is a bar-shaped pinion portion 4112 having a substantially U-shape having a pair of side walls 4113 and 4114 and a bottom wall 4115 connected at one end thereof, and a bar-like shape whose one end is connected to the bottom wall 4115. A grip portion 4111. The quadrangular column portion 133, the outer frame portion 131, the rubber rod 132 (FIG. 8), and the annular portion 121 are sandwiched by a pair of side walls 4113 and 4114 of the quadrangular column sandwiching portion 4112. A through hole 4110a is formed in a portion on the other end side of 4113 and 4114, and a bolt 116 passes therethrough. A recess opening 4110b is formed at the upper end of the through hole 4110a in FIG. 13, and the head of the bolt 116 is engaged therewith. The other end of the bolt 116 protrudes downward in FIG. 13 from the through-hole 4110a of the side walls 4113 and 4114 of the quadrangular prism holding portion 4112, and the screw tightening portion 117 is formed on the protruding portion as in the first embodiment. Are screwed together. Setting and changing the initial position of the sub handle 4110 and changing and fixing the position of the mounting portion 120 in the circumferential direction of the gear housing 30 are performed by rotating the screw tightening portion 117 as in the first embodiment.

  The power tool according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the power tool is not limited to a striking tool. For example, a disk-shaped grindstone may be used as a tip tool by applying the power tool to a grinder, and it can be applied to various power tools such as a driver and a drill.

  In the first to third and fifth embodiments, the knight hart spring has a quadrangular column portion 133. In the fourth embodiment, the knight hart spring has a head of a hexagonal bolt 3116. However, it is not limited to such a quadrangular prism shape or hexagonal shape. Another polygon may be sufficient and an involute shape may be sufficient.

The external appearance perspective view of 1st Embodiment which applied the electric tool of this invention to the impact tool. Sectional drawing of 1st Embodiment which applied the electric tool of this invention to the impact tool. FIG. 3 is a partial cross-sectional view of the rear side of the main body and the main handle in a non-working state of the impact tool shown in FIG. 2. Sectional drawing of the elastic means shown in FIG. Sectional drawing of the rotation urging means shown in FIG. The principal part sectional drawing which shows the attachment part and sub handle of 1st Embodiment which applied the electric tool of this invention to the impact tool. The principal part sectional drawing which shows the sub handle and biasing means of 1st Embodiment which applied the electric tool of this invention to the impact tool. The disassembled perspective view which shows the urging means of 1st Embodiment which applied the electric tool of this invention to the impact tool. The top view which shows the sub handle of 2nd Embodiment which applied the electric tool of this invention to the impact tool. The principal part sectional drawing which shows the attaching part and sub handle of 2nd Embodiment which applied the electric tool of this invention to the impact tool. The principal part sectional drawing which shows the attachment part and sub handle of 3rd Embodiment which applied the electric tool of this invention to the impact tool. The top view which shows the urging means of 4th Embodiment which applied the electric tool of this invention to the impact tool. The principal part fragmentary sectional view which shows the attachment part and sub handle of 5th Embodiment which applied the electric tool of this invention to the impact tool.

Explanation of symbols

16 ... Tip tool 21 ... Electric motor 30 ... Gear housing 36 ... Motion conversion mechanism 40 ... Cylinder 43 ... Piston 110 ... Sub handle 110a ... Through-hole 111 ... -Gripping part 115A ... Notch surface 116 ... Bolt 117 ... Screw tightening part 120 ... Mounting part 131 ... Outer frame part 132 ... Rubber bar 133 ... Square pillar part 133A ...・ Square prism irregularities

Claims (11)

A housing;
A main handle disposed on the rear side of the housing;
A sub-handle that is connected to the housing via a swing shaft that is oriented substantially perpendicular to the front-rear direction of the housing, and is swingable about the swing shaft;
Urging means for providing a resistance force in a direction against the swing of the sub handle;
The outer periphery of the housing has a mounted portion, and the mounting portion is attached to the mounted portion,
The sub handle is connected to the unit with said mounting is positionable initial position every predetermined angle with respect to attachment portion in the rocking direction around the shaft rocking, the sub-handle, the positioned initial position Ri swingably der against the resistance force of the biasing means within a predetermined range as a reference, biasing means, the resistive element drag to the sub-handle so that the sub-handle is located at the initial position An electric tool characterized by giving   The electric tool according to claim 1, wherein the attachment portion is attached so that an attachment position can be varied in a circumferential direction of the attached portion, and the sub handle is connected to the attachment portion. The attachment portion has a clamp around which the attached portion is mounted and the sub handle is fixed, and the sub handle is provided with a clamp tightening mechanism,
By tightening the clamp by the clamp tightening mechanism, the mounting position is fixed in the circumferential direction of the mounted portion, and the sub handle with respect to the mounted portion is desired in the swing direction around the swing axis. The power tool according to claim 1, wherein the power tool can be positioned at the initial position.   The power tool according to any one of claims 1 to 3, wherein the urging means includes a knight hart spring. The knight hart spring has a substantially cylindrical outer frame portion whose outer shape is substantially a polygonal column shape and is fixed to the mounting portion, and an axial center is directed in parallel to the swing shaft, and the inner peripheral surface side of the outer frame portion. Columnar rubber bars respectively disposed at the corners of the shaft, and polygonal column parts each having a corner disposed between the adjacent rubber bars whose axial centers coincide with the swing axis,
5. The electric tool according to claim 4, further comprising a connecting portion that connects the sub handle and the polygonal column portion so as to be swingable integrally.   The connecting portion includes a polygonal column uneven portion provided at an axial end portion of the polygonal column portion and a portion of the sub handle that is a part of the sub handle and is opposed to the uneven portion. The power tool according to claim 5, further comprising an uneven portion engageable with the uneven portion. The swing shaft is composed of a bolt that functions as the connecting portion,
The bolt has a shaft portion, a polygonal portion having a polygonal cross section cut perpendicular to the axial direction of the bolt provided on the shaft portion, and a polygonal head,
The polygonal part penetrates the polygonal column part and can be engaged with and disengaged from the polygonal column part, and can rotate integrally with the polygonal column part when engaged with the polygonal column part,
The head can be engaged with and disengaged from the sub handle, and can rotate integrally with the sub handle when engaged with the sub handle.
The power tool according to claim 5, wherein the polygonal portion of the bolt engages with the polygonal column portion when the head portion of the bolt is engaged with the sub handle. The swing shaft is composed of a bolt having a shaft portion and a head portion,
The knight hart spring is formed at the opening end of one end of a through hole formed so that the bolt can be passed through the sub handle, and forms a polygonal recessed portion that can accommodate and detach the head, and A cylindrical rubber bar whose axis is oriented parallel to the swing axis and arranged at the corners on the inner peripheral surface side of the polygonal recess, and a rubber bar composed of a polygonal shape and adjacent corners Each of the heads arranged,
5. The bolt can be fixed to a mounting portion in a non-rotatable manner when the head portion of the bolt is engaged with the polygonal recess via the rubber rod. Electric tool. A motor housed in the housing;
A tip tool attached to the tip side of the housing;
A reciprocating motion conversion unit for converting the rotation of the motor into a reciprocating motion,
The reciprocating motion conversion unit includes a cylinder, a piston slidably provided on the inner periphery of the cylinder, a motion converting unit that converts the rotational driving force of the motor into a reciprocating motion of the piston, and a reciprocating motion of the piston. The power tool according to any one of claims 1 to 8, wherein the power tool is driven by a reciprocating motion of the reciprocating motion conversion unit.   The power tool according to any one of claims 1 to 9, wherein the main handle is connected to the housing via elastic means.   The electric tool according to claim 10, wherein the elastic means includes a knight hart spring.

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