JP6410470B2 - Hammering machine - Google Patents

Description

  The present invention relates to a hitting work machine.

  Conventionally, hitting work machines are known (see, for example, Patent Document 1). The hitting work machine disclosed in this document includes a housing, a rotating body, a hitting body, and a hitting work body. The rotating body is supported in the housing so as to be rotatable. The striking work body is positioned in a direction in which its axis extends in the radial direction of the rotating body, and is supported so as to freely move a predetermined distance in the axial direction. When the rotating body is driven to rotate, the hitting body collides with the top of the hitting work body every time the rotating body makes one rotation, and the impact force in the axial direction is applied to the hitting work body.

Japanese Patent No. 4598788

  When such a hitting machine is used, the hitting work body frequently receives a very large hitting force from the hitting object. Thereby, a part of hitting work body may deform | transform so that the outer peripheral surface of a hitting work body may swell. When a part of the striking work body is deformed in this manner, the striking work body is pressed against the inner peripheral surface of the housing facing the outer peripheral surface, and the striking work body is fixed to the inner peripheral surface. If it does so, it will become difficult to remove a hit | damage working body out of a housing after completion | finish of the operation | work by a hit working machine.

  The present invention has been conceived under the circumstances described above, and its main object is to provide a striking work machine that can avoid the trouble that makes it difficult to remove the striking work body from the housing. To do.

  According to the first aspect of the present invention, a continuous striking force in the direction along the second axis can be obtained by the impact of the housing, the striking body accommodated in the housing and turning around the first axis, and the striking body. The second axis is aligned with the central axis of the hitting work body and extends in a direction intersecting the first axis, and the housing is provided with the hitting work body. A striking work body has a first outer peripheral surface and a second outer peripheral surface, each of which faces the inner peripheral surface, and the first outer peripheral surface The first outer peripheral surface is located on the side where the first axis is located, and the first outer peripheral surface has a portion retracted on the side where the second axis is located with respect to the second outer peripheral surface. A hitting machine is provided.

  Preferably, the first outer peripheral surface is retracted to the side where the second axis is located with respect to the second outer peripheral surface over the entire circumference in the circumferential direction of the second axis.

  Preferably, both of the cross-sectional shapes of the first outer peripheral surface and the second outer peripheral surface by a plane orthogonal to the second axis are circular.

  Preferably, the hitting work body has a top surface facing the side where the first axis is located, and the hitting body collides with the top surface.

  Preferably, the hitting work body has a tapered surface inclined with respect to the top surface, and the first outer peripheral surface is located on a side where the second outer peripheral surface is located with respect to the tapered surface, The tapered surface is located outside the space surrounded by the inner peripheral surface.

  Preferably, the retraction dimension of the first outer peripheral surface to the side where the second axis is located with respect to the second outer peripheral surface is 0.1 to 0.6 mm.

  Preferably, a ring-shaped elastic member that directly surrounds the hitting work body is further provided, and the hitting work body has a groove recessed from the second outer peripheral surface toward the side where the second axis is located. The groove is formed on the side where the first axis is located with respect to the elastic member.

  Preferably, the retraction dimension of the first outer peripheral surface to the side where the second axis is located with respect to the second outer peripheral surface is larger than the depth of the groove.

  Preferably, the tip of the hitting work body protrudes from a space surrounded by the inner peripheral surface toward a space accommodating the hitting object.

  Preferably, the first axis is located at a position offset in a first direction orthogonal to the first axis and the second axis with respect to the second axis.

  Preferably, when the striking body is viewed as the first direction coincides with the leftward direction, the striking body turns clockwise about the first axis.

  Preferably, the housing has a guide surface having a cylindrical inner surface centering on the first axis, and the hitting body turns around the first axis while rolling on the guide surface.

  Preferably, the apparatus further includes a rotating body that is housed in the housing and rotates about the first axis, and the hitting body is held by the rotating body and pivots around the first axis as the rotating body rotates. To do.

  Preferably, the rotating body includes two flanges spaced apart from each other in a direction along the first axis, and the two flanges are each formed with a notch that opens at a peripheral edge, and the hitting body is In the notch, it is held rotatably and movable in the radial direction of the flange.

  Preferably, the hitting body has a cylindrical shape having a constant outer diameter over the entire axial length of the hitting body.

  Preferably, the apparatus further includes a driving source for rotating the rotating body, and the rotating body is rotated by 5600 to 6000 per minute by the driving source.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a front view of the hitting work machine concerning a 1st embodiment of the present invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which follows the III-III line of FIG. It is a figure which expands and schematically shows a part of FIG. 2, FIG. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which shows typically a part of hitting work machine concerning 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

<First Embodiment>
1st Embodiment of this invention is described using FIGS.

  FIG. 1 is a front view of a hitting work machine according to a first embodiment of the present invention.

  The striking work machine A1 shown in the figure is configured to be able to easily perform the work of driving the rod-shaped object Ob into the ground by continuously applying a downward striking force to the upper end. The rod-shaped object Ob is, for example, a pile or a pipe.

  2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The hitting work machine A1 includes a drive source 10, a transmission shaft 20 (see FIG. 3), a cylindrical body 30, and a hitting mechanism 40.

  The drive source 10 is an engine and generates a desired rotational output.

  The transmission shaft 20 transmits the rotational output from the drive source 10 to the striking mechanism 40. The transmission shaft 20 extends in the vertical direction in FIG. A bevel gear 25 is attached to the tip of the transmission shaft 20.

  A cylindrical body 30 shown in FIG. 1 accommodates the transmission shaft 20. As clearly shown in FIG. 1, the cylindrical body 30 is provided with a gripping portion 31 and an operation portion 32. The grip part 31 is a part for an operator to grip when using the hitting work machine A1. The operation unit 32 is for controlling the rotational output transmitted from the drive source 10. The rotation output transmitted to the striking mechanism 40 is adjusted by operating the operation unit 32 in a state where the operator holds the grip unit 31.

  The striking mechanism 40 shown in FIGS. 1 to 3 is a mechanism for striking the rod-shaped object Ob in the proximal direction of the cylindrical body 30 by the rotational output from the drive source 10. In the present embodiment, the hitting mechanism 40 is provided at the tip of the cylindrical body 30.

  The hitting mechanism 40 includes a housing 200, a rotating body 300, a hitting body 400, a hitting working body 500, and a cylindrical guide member 600.

  The rotating body 300 is accommodated in the housing 200. The rotating body 300 rotates around the first axis Ox1. In FIG. 2, the rotating body 300 rotates clockwise. The rotating body 300 is rotated inside the housing 200 by the rotation output from the driving source 10. 2 is different from the posture of the rotator 300 in FIG.

  The rotating body 300 includes two flanges 310, a connecting portion 320, a rotation support shaft 330, and a rotation support shaft 340.

  The two flanges 310 are separated from each other in the direction along the first axis Ox1. Each of the two flanges 310 is formed with a notch 311 (see FIG. 2) that opens to the periphery. The notch 311 has a certain width and extends radially inward of the flange 310. The connecting part 320 connects the two flanges 310, and the connecting part 320 and the two flanges 310 are integrated.

  The rotation support shafts 330 and 340 protrude from the outer surfaces of the flanges 310. The axes of the rotation spindles 330 and 340 are the same and coincide with the first axis Ox1. The rotation support shaft 330 is rotatably supported with respect to both side walls of the housing 200 via the bearing 220 and the rotation support shaft 340 is supported via the bearing 230. A bevel gear 341 is attached to one end of the rotation support shaft 340. The rotational output from the drive source 10 is transmitted to the distal end side of the cylindrical body 30 via the transmission shaft 20. The rotating body 300 is driven to rotate by meshing the bevel gear 25 and the bevel gear 341 attached to the tip of the transmission shaft 20.

  A cylindrical internal space is formed in the housing 200. The housing 200 includes a side wall member 240, a peripheral wall member 250, and a boss portion 260.

  Guide surfaces 251 and 252 are formed on the inner periphery of the peripheral wall member 250. The guide surfaces 251 and 252 have a cylindrical inner surface shape around the first axis Ox1 (the rotation center axis of the rotating body 300 and the rotation center axes of the rotation support shafts 330 and 340). The side wall member 240 is substantially rectangular and is positioned so as to sandwich the peripheral wall member 250 from both sides. As described above, the rotation support shafts 330 and 340 of the rotating body 300 are rotatably supported by the side wall member 240.

  As shown in FIG. 3, the boss portion 260 is connected to the peripheral wall member 250. The boss portion 260 extends outward from the peripheral wall member 250 and communicates with the internal space of the housing 200. The axis of the boss portion 260 intersects the first axis Ox1, and in the present embodiment, is orthogonal to the first axis Ox1. The boss portion 260 has an inner peripheral surface 261. The inner peripheral surface 261 is a cylindrical inner surface and surrounds the striking work body 500. A recess 262 is formed in the boss portion 260. In the recess 262, a ring-shaped elastic member 800 (O-ring) is disposed.

  The hitting body 400 is accommodated in the housing 200 and turns around the first axis Ox1. The hitting body 400 is held by the rotating body 300 and turns around the first axis Ox1 as the rotating body 300 rotates. As described above, in FIG. 2, since the rotating body 300 rotates clockwise around the first axis Ox1, the hitting body 400 rotates clockwise around the first axis Ox1. The hitting body 400 is held in the notch 311 so as to be rotatable and movable in the radial direction of the flange 310. In the present embodiment, the hitting body 400 turns around the first axis Ox1 while rolling on the guide surfaces 251 and 252. The hitting body 400 has a cylindrical shape having a constant outer diameter over the entire axial length of the hitting body 400. The outer diameter of the hitting body 400 substantially matches the width of the notch 311 formed in the flange 310. The axial length of the hitting body 400 substantially matches the axial length of the rotating body 300.

  The hitting work body 500 is given a continuous hitting force in the direction along the second axis Ox2 when the hitting body 400 collides. The second axis Ox2 coincides with the central axis of the hitting work body 500. The second axis Ox2 extends in a direction intersecting the first axis Ox1. In the present embodiment, the second axis Ox2 is orthogonal to the first axis Ox1. The second axis Ox2 is preferably orthogonal to the first axis Ox1, but unlike the present embodiment, it may not be orthogonal to the first axis Ox1. The hitting work body 500 is held by the boss portion 260 so as to be movable in the direction along the second axis Ox2. The tip of the hitting work body 500 protrudes from the space surrounded by the inner peripheral surface 261 toward the space in which the hitting object 400 is accommodated. That is, the tip of the hitting work body 500 is located in a space in which the rotating body 300 in the housing 200 rotates. The hitting work body 500 is directly surrounded by the elastic member 800 and is in contact with the elastic member 800.

  As shown in FIGS. 2 and 3, the hitting work body 500 includes a shank portion 510 and a large-diameter flange portion 520.

  The shank portion 510 has a columnar shape (a columnar shape in the present embodiment) having an outer diameter corresponding to the inner diameter of the boss portion 260. The large diameter flange portion 520 is a portion formed in the lower portion of the shank portion 510.

  FIG. 4 is a diagram schematically showing a part of FIGS. 2 and 3 in an enlarged manner. FIG. 5 is a cross-sectional view taken along line VV in FIG.

  As shown in FIGS. 2 to 5, the striking work body 500 includes a first outer peripheral surface 510 </ b> A, a second outer peripheral surface 510 </ b> B, a tapered surface 510 </ b> C, and a top surface 510 a. In the present embodiment, the first outer peripheral surface 510A, the second outer peripheral surface 510B, the tapered surface 510C, and the top surface 510a are constituted by the shank portion 510.

  Each of the first outer peripheral surface 510A and the second outer peripheral surface 510B faces the inner peripheral surface 261. The first outer peripheral surface 510A is located on the side where the first axis Ox1 is located with respect to the second outer peripheral surface 510B. In the present embodiment, since the shank portion 510 has a cylindrical shape, the cross-sectional shapes of the first outer peripheral surface 510A and the second outer peripheral surface 510B by a plane orthogonal to the second axis Ox2 are both circular. If the specific dimension regarding the 2nd outer peripheral surface 510B is given, the cross-sectional shape of the 2nd outer peripheral surface 510B by the plane orthogonal to the 2nd axis line Ox2 will be a circular shape whose diameter is 20-30 mm, for example. 510A of 1st outer peripheral surfaces have the site | part retracted | saved to the side in which the 2nd axis line Ox2 is located with respect to the 2nd outer peripheral surface 510B. The first outer peripheral surface 510A is retracted to the side where the second axis Ox2 is located with respect to the second outer peripheral surface 510B over the entire circumference in the circumferential direction of the second axis Ox2. The retraction dimension L1 (see FIGS. 4 and 5) of the first outer peripheral surface 510A toward the side where the second axis Ox2 is located with respect to the second outer peripheral surface 510B is, for example, 0.1 to 0.6 mm. In order to form a shape in which the first outer peripheral surface 510A is retracted to the side where the second axis Ox2 is located with respect to the second outer peripheral surface 510B, the first outer peripheral surface 510A is configured when the striking work body 500 is manufactured. The tolerance for manufacturing the portion to be made may be different from the tolerance for manufacturing the portion constituting the second outer peripheral surface 510B.

  The top surface 510a is a surface facing the side where the first axis Ox1 is located. In the present embodiment, the top surface 510a is a flat surface orthogonal to the second axis Ox2. The hitting body 400 collides with the top surface 510a. Thereby, a continuous striking force in the direction along the second axis Ox2 is applied to the striking work body 500.

  Unlike the present embodiment, the hitting work body 500 may be provided with a recessed portion that is recessed from the top surface 510a and is filled with a lubricant.

  The tapered surface 510C is inclined with respect to the top surface 510a. The first outer peripheral surface 510A is located on the second outer peripheral surface 510B side with respect to the tapered surface 510C. The tapered surface 510C is located outside the space surrounded by the inner peripheral surface 261. That is, the tapered surface 510 </ b> C is located in a space in which the rotating body 300 in the housing 200 rotates. Unlike the present embodiment, the striking work body 500 may not have the tapered surface 510C.

  As shown in FIG. 2, the first axis Ox1 is located at a position offset with respect to the second axis Ox2 in a first direction X1 orthogonal to the first axis Ox1 and the second axis Ox2. The offset dimension L2 in the first direction X1 with respect to the second axis Ox2 is, for example, 5 to 10 mm. As described above, in FIG. 2, the rotating body 300 rotates clockwise, and the hitting body 400 turns clockwise. Therefore, when the striking body 400 is viewed with the first direction X1 coinciding with the leftward direction, the striking body 400 turns clockwise about the first axis Ox1.

  As shown in FIG. 4, a groove 510 </ b> G is formed in the hitting work body 500. The groove 510G is recessed from the second outer peripheral surface 510B toward the side where the second axis Ox2 is located. The groove 510G is formed on the elastic member 800 on the side where the first axis Ox1 is located. In the present embodiment, the first outer peripheral surface 510A and the second outer peripheral surface 510B are located on opposite sides of the groove 510G. That is, the groove 510G is located between the first outer peripheral surface 510A and the second outer peripheral surface 510B.

  As shown in FIGS. 2 and 3, the striking work body 500 has its upper movement position defined by the large diameter flange portion 520 coming into contact with the bottom portion of the boss portion 260.

  As shown in FIGS. 2 and 3, the cylindrical guide member 600 is attached to the lower portion of the boss portion 260. The cylindrical guide member 600 is put on the upper end of the rod-shaped object Ob.

  In the striking work machine A1, it is desirable that the peripheral wall member 250, the rotating body 300, the striking body 400, and the striking work body 500 are formed of an iron-based hard material, and the surface is subjected to a curing process. About the side wall member 240, since an impact does not act directly, it can be formed with lightweight materials, such as aluminum.

  Next, a method of using the hit working machine A1 will be described.

  In the hitting work machine A1, the worker holds the gripping part 31, holds the tip of the rod-shaped object Ob temporarily held on the ground inside the cylindrical guide member 600, and operates the operation part 32. Used by.

  When the operation unit 32 is operated to increase the rotation speed of the drive source 10, the rotation output of the drive source 10 is transmitted to the transmission shaft 20 by the operation of a clutch device (not shown). The rotating body 300 in the housing 200 is rotationally driven by the rotation of the transmission shaft 20. The rotating body 300 is rotated 5600 to 6000 per minute, for example. The rotation speed is very high.

  When the rotating body 300 rotates, the hitting body 400 turns so as to roll on the guide surfaces 251 and 252. The hitting work body 500 is positioned so that its top surface 510a forms a string of the guide surfaces 251 and 252. Therefore, each time the rotating body 300 makes one turn, the hitting object 400 that turns at high speed is the hitting work body 500. Rolls in contact with the top surface 510a. At this time, since a strong centrifugal force is acting on the hitting body 400, the action of this centrifugal force is assisted, and the hitting work body 500 is pressed down downward in the second axis Ox2. In this manner, a downward high frequency repeated impact force continuously acts on the hitting work body 500. Due to such downward continuous impact force, the rod-shaped object Ob held as described above is driven into the ground.

  Next, the effect of this embodiment is demonstrated.

  In the present embodiment, the first outer peripheral surface 510A has a portion retracted on the side where the second axis Ox2 is located with respect to the second outer peripheral surface 510B. According to such a configuration, it is possible to ensure a greater distance between the inner peripheral surface 261 and the first outer peripheral surface 510A. Therefore, even if the striking work body 500 is deformed such that the striking work body 500 receives the continuous striking force from the striking body 400 and the first outer peripheral surface 510A swells toward the inner peripheral surface 261, the first outer peripheral surface 510A. It is possible to prevent the striking work body 500 from coming into pressure contact with the inner peripheral surface 261. Therefore, the hitting work body 500 can be prevented from being fixed to the inner peripheral surface 261. As a result, it is possible to avoid a problem that it is difficult to remove the striking work body 500 outside the housing 200 (downward in this embodiment) after the work by the striking work machine A1 is completed.

  In the present embodiment, the first outer circumferential surface 510A is retracted to the side where the second axis Ox2 is located with respect to the second outer circumferential surface 510B over the entire circumference in the circumferential direction of the second axis Ox2. According to such a configuration, for the same reason as described above, it is difficult to remove the striking work body 500 outside the housing 200 (downward in the present embodiment) after the work by the striking work machine A1 is completed. Can be avoided more reliably.

  In the present embodiment, the striking work body 500 is formed with a groove 510G that is recessed from the second outer peripheral surface 510B toward the side where the second axis Ox2 is located. The groove 510G is formed on the elastic member 800 on the side where the first axis Ox1 is located. According to such a configuration, after the work performed by the hitting work machine A1, when the hitting work body 500 is about to fall downward and the hitting work body 500 is slightly lowered, the elastic member 800 is fitted into the groove 510G. Thereby, the striking work body 500 is held in the space surrounded by the inner peripheral surface 261, and the striking work body 500 can be prevented from falling.

  In the present embodiment, the first axis Ox1 is located at a position offset with respect to the second axis Ox2 in a first direction X1 orthogonal to the first axis Ox1 and the second axis Ox2. According to such a configuration, the hitting body 400 can hit not the corner (for example, the tapered surface 510C) of the hitting work body 500 but a portion of the hitting work body 500 that is closer to the second axis Ox2. As a result, the hitting body 400 can apply a greater hitting force to the hitting work body 500. Further, the first axis Ox1 is surrounded by the inner peripheral surface 261 by a configuration in which the first axis Ox1 is offset in the first direction X1 perpendicular to the first axis Ox1 and the second axis Ox2 with respect to the second axis Ox2. The protrusion amount of the tip of the hitting work body 500 from the created space can be increased. As a result, the hitting body 400 can apply a greater hitting force to the hitting work body 500. When a large striking force can be applied to the striking work body 500, the rod-shaped object Ob can be driven into the ground more efficiently.

  As described above, in the present embodiment, the hitting work body 500 is easily deformed because the hitting work body 500 is given a large hitting force. Then, the first outer peripheral surface 510A tends to swell toward the inner peripheral surface 261. Therefore, in the viewpoint of preventing the hitting work body 500 from being fixed to the inner peripheral surface 261, the present embodiment in which the first axis Ox1 is located at a position offset in the first direction X1 with respect to the second axis Ox2. When the configuration of the form is used, a configuration in which the first outer peripheral surface 510A has a portion retracted on the side where the second axis Ox2 is located with respect to the second outer peripheral surface 510B is particularly preferable.

Second Embodiment
A second embodiment of the present invention will be described with reference to FIG.

  In the following description, the same or similar components as those described above will be denoted by the same reference numerals as those described above, and description thereof will be omitted as appropriate.

  FIG. 6 is a cross-sectional view schematically showing a part of a hitting work machine according to the second embodiment of the present invention.

  This embodiment is different from the first embodiment in that a groove 510G is located in the middle of the second outer peripheral surface 510B. In the present embodiment, the retraction dimension L1 is larger than the depth of the groove 510G. However, unlike the present embodiment, the retraction dimension L1 may be smaller than the depth of the groove 510G. Since the description of the first embodiment can be applied to other points, the description thereof is omitted in this embodiment.

  According to the present embodiment, in addition to the operational effects described in the first embodiment, the following operational effects are achieved.

  If the retraction dimension L1 is larger than the depth of the groove 510G, the distance between the inner peripheral surface 261 and the first outer peripheral surface 510A can be further increased. Therefore, for the same reason as described in the first embodiment, it is difficult to remove the striking work body 500 outside the housing 200 (downward in this embodiment) after the work by the striking work machine A2. Can be avoided more preferably.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the present invention can be changed in various ways.

DESCRIPTION OF SYMBOLS 10 Drive source 20 Transmission shaft 200 Housing 220, 230 Bearing 240 Side wall member 25 Bevel gear 250 Peripheral wall member 251, 252 Guide surface 260 Boss part 261 Inner peripheral surface 262 Recess 30 Cylindrical body 300 Rotating body 31 Gripping part 310 Flange 311 Cutting Notch 32 Operation part 320 Connecting part 330, 340 Rotating support shaft 341 Bevel gear 40 Blowing mechanism 400 Blowing body 500 Blowing work body 510 Shank part 510A First outer peripheral surface 510a Top surface 510B Second outer peripheral surface 510C Tapered surface 510G Groove 520 Large diameter Flange portion 600 Cylindrical guide member 800 Elastic member A1, A2 Strike working machine L1 Retraction dimension L2 Offset dimension Ob Bar-shaped object Ox1 First axis Ox2 Second axis X1 First direction

Claims (16)

A housing;
A hitting body accommodated in the housing and swiveling around a first axis;
A striking work body to which a continuous striking force in a direction along the second axis is given by the collision of the striking body,
The second axis line coincides with the center axis line of the hitting work body and extends in a direction intersecting the first axis line,
The housing has a cylindrical inner peripheral surface surrounding the hitting work body,
The striking work body has a first outer peripheral surface and a second outer peripheral surface, each facing the inner peripheral surface,
The first outer peripheral surface is located on a side where the first axis is located with respect to the second outer peripheral surface,
The first outer peripheral surface, have a site retracted on the side of the position of the second axis relative to the second outer peripheral surface,
The striking work body has a top surface facing the side where the first axis is located,
The hitting work body has a tapered surface inclined with respect to the top surface, and the tapered surface is connected to the top surface;
The first outer peripheral surface is located on a side where the second outer peripheral surface is located with respect to the tapered surface,
A striking work machine in which a retraction dimension of the first outer peripheral surface to a side where the second axis is located with respect to the second outer peripheral surface is smaller than a dimension of the tapered surface in a radial direction of the second axis .   2. The striking work machine according to claim 1, wherein the first outer peripheral surface is retracted to a side where the second axis is located with respect to the second outer peripheral surface over the entire circumference in the circumferential direction of the second axis. .   3. The striking work machine according to claim 1, wherein cross-sectional shapes of the first outer peripheral surface and the second outer peripheral surface by a plane orthogonal to the second axis are both circular. The front Kiitadaki surface, the撃打body collides,撃打working machine according to any of claims 1 to 3. Before SL tapered surface, located outside the enclosed by the inner circumferential surface space,撃打working machine according to claim 4.   6. The batting according to claim 1, wherein a retraction dimension of the first outer peripheral surface to a side where the second axis is located with respect to the second outer peripheral surface is 0.1 to 0.6 mm. Work machine. A ring-shaped elastic member that directly surrounds the striking work body;
The striking work body is formed with a groove recessed from the second outer peripheral surface toward the side where the second axis is located,
The hitting work machine according to any one of claims 1 to 6, wherein the groove is formed on a side where the first axis is located with respect to the elastic member.   The striking work machine according to claim 7, wherein a retraction dimension of the first outer peripheral surface to a side where the second axis is located with respect to the second outer peripheral surface is larger than a depth of the groove.   The hitting work machine according to any one of claims 1 to 8, wherein a tip of the hitting work body projects from a space surrounded by the inner peripheral surface toward a space accommodating the hitting object. .   The said 1st axis line is located in the position offset in the 1st direction orthogonal to the said 1st axis line and the said 2nd axis line with respect to the said 2nd axis line. The hitting work machine described.   The hitting work machine according to claim 10, wherein when the hitting body is viewed with the first direction coinciding with the leftward direction, the hitting body turns clockwise around the first axis. The housing has a cylindrical inner surface guide surface with the first axis as a center,
The hitting work machine according to any one of claims 1 to 11, wherein the hitting body turns around the first axis while rolling on the guide surface. A rotating body that is housed in the housing and rotates about the first axis;
The hitting work machine according to any one of claims 1 to 12, wherein the hitting body is held by the rotating body and turns around the first axis along with the rotation of the rotating body. The rotating body includes two flanges spaced apart from each other in a direction along the first axis,
Each of the two flanges is formed with a notch that opens to the periphery,
The hitting work machine according to claim 13, wherein the hitting body is held in the notch so as to be rotatable and movable in a radial direction of the flange.   The hitting work machine according to claim 14, wherein the hitting body has a cylindrical shape having a constant outer diameter over the entire axial length of the hitting body. A driving source for rotating the rotating body;
The striking work machine according to any one of claims 13 to 15, wherein the rotating body is rotated by 5600 to 6000 per minute by the driving source.

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