JP6540652B2 - Removal mechanism - Google Patents

Description

  The present invention relates to an attachment / detachment mechanism used in a construction machine.

  For example, Patent Document 1 describes a conventional construction machine. The construction machine described in the document includes a main body (a pivot frame in the same document), a connecting member (mast) connected to the main body, and a mounting member (winch) attached to the main body. The mounting member is removable from the connecting member and removable from the main body.

Unexamined-Japanese-Patent No. 2007-238262

  The mounting member is fixed to the main body by a pin. Therefore, when attaching the mounting member to the main body, it is necessary to align the pin hole on the main body side with the pin hole on the mounting member side. Therefore, it takes time and effort to align the pin holes.

  Then, an object of this invention is to provide the attachment or detachment mechanism which can suppress the time and effort which are required for position alignment of a pin hole.

  The attachment / detachment mechanism of the present invention includes a main body, a connection member, an attachment member, and a guide member. The main body is an upper main body of a construction machine and has a main body side pin hole. The connecting member is movably connected to the main body with respect to the main body. The mounting member is removable from the connecting member, removable from the main body, and has a mounting member side pin hole. The guide member guides the position of the mounting member relative to the main body. The mounting and demounting direction of the mounting member with respect to the main body is referred to as a mounting and demounting direction. An axial direction of a pin inserted into the main body side pin hole and the attachment member side pin hole is taken as a pin axial direction. The direction perpendicular to the mounting and demounting direction and the pin axis direction is taken as the mounting and demounting direction. The guide member includes a protrusion and a recess. The said convex part is provided in either of the said main body and the said attachment member, and is convex in the attachment or detachment direction. The concave portion is provided on the side different from the side on which the convex portion is provided among the main body and the mounting member, and the convex portion is inserted when the mounting member is mounted to the main body. The said convex part is provided with the convex-part front-end | tip part and the convex-part inclination part. The tip of the convex portion constitutes a tip side portion of the convex portion. The convex portion inclined portion is formed on both outer sides in the mounting / demounting orthogonal direction than the front end portion of the projection, and the width in the mounting / demounting orthogonal direction of the projection is narrower toward the front end side of the projection. Tilt. The recess includes a recess bottom and a recess slope. The recess bottom portion constitutes a bottom side portion of the recess, and is configured such that the tip of the protrusion can hit when the protrusion is inserted into the recess. The recessed sloped portion is formed on both outer sides in the mounting / demounting orthogonal direction than the recessed portion bottom, and is inclined with respect to the mounting / removing direction such that the gap in the mounting / demounting orthogonal direction of the recess becomes narrower toward the bottom of the recess. The recess inclined portion is configured to be able to contact the protrusion inclined portion when the protrusion is inserted into the recess. The convex portion and the concave portion are configured such that when the convex portion is inserted into the concave portion, the displacement between the main body side pin hole and the attachment member side pin hole falls within a predetermined range.

  According to the above configuration, it is possible to suppress the time and effort required for the alignment of the pin holes.

It is the figure which looked at the attachment / detachment mechanism from the side. It is a figure which shows the guide member 50 grade | etc., Shown in FIG. It is an F3 arrow line view of the guide member 50 shown in FIG. It is F4 arrow line view of the guide member 50 shown in FIG. It is a figure which shows the pinching part 60 etc. which are shown in FIG. It is the FIG. 1 equivalent view of the state in which the mast 30 shown in FIG. 1 fell. FIG. 7 is a view corresponding to FIG. 6 showing a state in which the mounting member 40 shown in FIG. 6 is removed from the mast 30. It is the FIG. 4 equivalent view which shows the attachment or detachment mechanism 201 of 2nd Embodiment.

  With reference to FIGS. 1-7, the attachment / detachment mechanism 1 of 1st Embodiment shown in FIG. 1 is demonstrated.

  The detachment mechanism 1 is used for a construction machine. The construction machine in which the attachment / detachment mechanism 1 is used is a machine that performs work such as construction work, and is, for example, a crane, such as an excavator. The attachment / detachment mechanism 1 is a mechanism for attaching the attachment member 40 attached to the mast 30 (connection member) to the main body 10. The mounting and demounting mechanism 1 includes a main body 10, a mast 30, a lower spreader 38, an attachment member 40, and a guide member 50.

  The main body 10 is an upper swing body attached pivotably to a lower traveling body (not shown). A boom (not shown) or the like is attached to the main body 10. The boom is attached to the main body 10 so as to be able to be raised and lowered relative to the main body 10. The main body 10 includes a main body frame 11, a mast foot pin 12, a lower spreader connection portion 13, a main body side attachment portion 15, a pin 21 (see FIG. 2), and a cylinder 23 (see FIG. 3).

  The main body frame 11 is a structure that constitutes the main body 10, and has a longitudinal direction. The longitudinal direction of the main body frame 11 is taken as the front-rear direction X. In the front-rear direction X, the side (or direction) from the main body side attachment portion 15 toward the mast foot pin 12 is referred to as the front side X1, and the opposite side is referred to as the rear side X2. A horizontal direction orthogonal to the front-rear direction X is taken as a horizontal direction Y. A direction perpendicular to the longitudinal direction X and the lateral direction Y is referred to as the vertical direction Z. In the vertical direction Z, the side from the main body frame 11 toward the mast 30 is referred to as the upper side Z1, and the opposite side is referred to as the lower side Z2.

  The mast foot pin 12 (connecting member connecting portion) is a pin to which the proximal end of the mast 30 is connected, and is a pin serving as a rotation axis of the mast 30 with respect to the main body 10. The mast foot pin 12 is provided on the front side X1 end of the main body frame 11. The above "end" means an end and its vicinity (the same applies hereinafter).

  The lower spreader connecting portion 13 is a portion to which the lower spreader 38 is connected, and is provided at the rear X2 end of the main body frame 11.

  The main body side attachment portion 15 is a portion to which the attachment member 40 is attached and which supports the attachment member 40. For example, the front side X1 portion of the mounting member 40 is attached to the main body side attachment portion 15. The main body side attachment portion 15 is provided inside the main body frame 11, and is disposed, for example, at a substantially central portion in the front-rear direction X of the main body frame 11. The main body side attachment portion 15 includes a support frame 15 a, a main body plate portion 15 b shown in FIG. 2, and a main body side pin hole 16.

  The support frame 15a is a structure that supports the mounting member 40 from the lower side Z2 via the main body plate portion 15b. As shown in FIG. 1, the support frame 15 a is fixed to the main body frame 11. As shown in FIG. 2, the main body plate portion 15 b has a plate shape and, for example, protrudes from the support frame 15 a to the upper side Z1. As shown in FIG. 3, when the mounting member 40 is attached to the main body 10, the main body plate portion 15 b is disposed so as to sandwich the mounting frame 41 (described below).

  The main body side pin hole 16 is a pin hole into which the pin 21 is inserted. The main body side pin hole 16 is fixed with respect to the main body frame 11, for example, is formed in the main body side attachment part 15, and is formed in the main body plate part 15b. In addition, as shown in FIG. 1, the main body side attachment part 17 to which parts other than the front side X1 part of the attachment member 40, for example, rear side X2 part of the attachment member 40, may be attached may be provided.

  The pins 21 (see FIG. 2) connect and fix the main body 10 and the mounting member 40. As shown in FIG. 3, the pin 21 is inserted into the main body side pin hole 16 and the mounting member side pin hole 46 (described below). The main body side pin hole 16 and the mounting member side pin hole 46 are also referred to as a pin hole H. The pin 21 includes a tapered portion 21t. The tapered portion 21 t is formed on the tip end side portion (tip end portion) of the pin 21 and is formed such that the diameter of the pin 21 becomes smaller toward the tip end side of the pin 21.

  The cylinder 23 (pin attaching and detaching device) is a device for attaching and detaching the pin 21 to and from the pin hole H. The cylinder 23 is attached to the main body frame 11 (see FIG. 1), for example, attached to the support frame 15a. The cylinder 23 is disposed coaxially with the main body side pin hole 16 so as to face the main body side pin hole 16 in the lateral direction Y. The cylinder 23 is, for example, a hydraulic cylinder.

  The mast 30 (connection member) is movably connected to the main body 10 with respect to the main body 10, as shown in FIG. The mast 30 is a relief member attached to the main body 10 so as to be capable of being raised and lowered relative to the main body 10. The mast 30 raises and lowers a boom (not shown). The mast 30 includes a main column 31, a mast foot 33, a mast side attachment 35, and an upper spreader 37.

  The main column 31 is a box-shaped (hollow) structure. The mast 30 is a so-called box mast. Two main columns 31 are provided at intervals in the lateral direction Y so as to be aligned in the lateral direction Y. The mast foot 33 is provided at the proximal end of the mast 30 and is attached to the mast foot pin 12.

  The mast side attachment portion 35 is a portion to which the attachment member 40 is attached via, for example, a pin. The mast side attachment portion 35 is fixed to each of the two main columns 31. As shown in FIG. 5, the mast side attachment portion 35 is configured to sandwich the attachment frame 41 (described below) in the lateral direction Y. As shown in FIG. 1, the upper spreader 37 is provided at the tip of the main column 31 and has a plurality of pulleys.

  The lower spreader 38 is a device having a plurality of pulleys. As shown in FIG. 7, the lower spreader 38 is attached to the main body 10 and attached to the lower spreader joint 13. A relief rope (not shown) is hung on the lower spreader 38 and the upper spreader 37.

  The mounting member 40 is removable from the mast 30 and removable from the main body 10. As shown in FIG. 1, the mounting member 40 includes a mounting frame 41, a winch 43, and a mounting member side pin hole 46.

  The mounting frame 41 is a frame that supports the winch 43. The mounting frame 41 is attachable to the mast side mounting portion 35 by a pin. The mounting frame 41 is attachable to the main body side mounting part 15 by the pin 21 (refer FIG. 2). The mounting frame 41 has, for example, a plate or the like arranged to sandwich the winch 43 in the lateral direction Y.

  The winch 43 is a device for winding and feeding the wire rope. The winch 43 is, for example, a winding winch that winds up and unwinds a winding rope for rolling a boom (not shown). As the winch 43 winds up and operates the relief rope, the distance between the lower spreader 38 and the upper spreader 37 shown in FIG. 7 changes, and the mast 30 is undulated relative to the main body 10. Since the mast 30 and the boom are connected by a guy line (a rope, a link, etc.), as a result of the mast 30 being undulated, the boom is undulated. In addition, the winch 43 may wind and take out ropes other than a relief rope.

  The mounting member side pin hole 46 is a pin hole into which the pin 21 (see FIG. 2) is inserted as shown in FIG. 1, and is fixed to the mounting frame 41. For example, the mounting member side pin holes 46 are formed at the front X 1 end and the lower Z 2 end of the mounting frame 41. As shown in FIG. 3, the axial direction of the pin 21 inserted into the pin hole H is taken as a pin axial direction y. The pin axial direction y is, for example, the lateral direction Y. As shown in FIG. 2, the mounting and demounting direction of the mounting member 40 with respect to the main body 10 is taken as a mounting and demounting direction z. The attachment / detachment direction z is, for example, the vertical direction Z or the substantially vertical direction Z. The direction of movement of the attachment member 40 with respect to the main body 10 when the attachment member 40 is attached to the main body 10 in the attachment / detachment direction z is the attachment side z2, and the opposite side is the removal side z1. The attachment side z2 is, for example, the lower side Z2. The removal side z1 is, for example, the upper side Z1. A direction orthogonal to the mounting and demounting direction z and the pin axis direction y is taken as a mounting and demounting orthogonal direction x. The attachment / detachment orthogonal direction x is the front-rear direction X or the substantially front-rear direction X.

  The guide member 50 guides the position of the mounting member 40 with respect to the main body 10. The guide member 50 is provided on the main body 10 and the attachment member 40. At least a part of the guide member 50 is fixed to the main body 10 and the attachment member 40 by welding (can-making attachment). The guide member 50 includes a protrusion 51, a recess 53, a pinched portion 55, and a pinching portion 60. Below, as shown to FIG. 2 and FIG. 6, the state (or the attached state) where the attachment member 40 was attached to the main body 10 is demonstrated.

  The protrusion 51 and the recess 53 are configured such that the protrusion 51 is inserted into the recess 53 when the mounting member 40 is attached to the main body 10, as shown in FIG. When the convex portion 51 is inserted into the concave portion 53, the convex portion 51 and the concave portion 53 have a shift between the main body side pin hole 16 and the mounting member side pin hole 46 (slip of the pin hole H) within a predetermined range. Configured The predetermined range is an allowance range of deviation of the pin hole H in which the pin 21 can be inserted into the pin hole H.

  The convex portion 51 is provided on either of the main body 10 and the attachment member 40. In the present embodiment, the convex portion 51 is provided on the main body 10 and fixed to the main body 10. For example, the convex portion 51 is fixed to the main body side attachment portion 15, fixed to the main body plate portion 15b, and integrally formed with the main body plate portion 15b. The convex portion 51 is disposed in the vicinity of the main body side pin hole 16 and is disposed closer to the removal side z 1 than the main body side pin hole 16. The convex portion 51 has a convex shape (projecting shape) in the attachment / detachment direction z, and has a convex shape on the detachment side z1. For example, the convex portion 51 is trapezoidal when viewed in the pin axis direction y. The convex portion 51 includes a convex portion distal end portion 51 a and a convex portion inclined portion 51 b.

  The convex tip portion 51 a constitutes a tip side portion of the convex portion 51. The tip end side of the convex portion 51 is a removal side z1. The convex portion tip portion 51a extends in the mounting / demounting orthogonal direction x, and extends in a straight line (including a substantially straight line, the same applies hereinafter) as viewed from the pin axis direction y.

  The convex inclined portion 51b is formed on both outer sides in the attachment / detachment orthogonal direction x with respect to the convex tip portion 51a. The convex portion inclined portion 51b is disposed on the front side X1 and the rear side X2 of the convex portion front end portion 51a. The convex portion inclined portion 51b is inclined with respect to the mounting and demounting direction z such that the width of the convex portion 51 in the mounting and demounting orthogonal direction x becomes narrower toward the tip end side (removal side z1) of the convex portion 51. The convex sloped portion 51b of each of the front side X1 and the rear side X2 linearly extends when viewed in the pin axis direction y. The inclination angle of the portion on the front side X1 of the convex portion inclined portion 51b with respect to the attachment / detachment direction z with respect to the projection tip portion 51a is the same as the inclination angle of the portion on the rear side X2 with respect to the attachment / detachment direction z. May be In the example shown in FIG. 2, the convex portion inclined portion 51 b is inclined by about 45 ° with respect to the mounting and demounting direction z. For example, the position (attachment / detachment direction z position) in the attachment / detachment direction z of the attachment side z2 end of the convex inclined portion 51b is the same position as the attachment / detachment direction z position of the detachment side z1 end of the main body side pin hole 16.

  The concave portion 53 is provided on the side of the main body 10 and the mounting member 40 different from the side on which the convex portion 51 is provided. In the present embodiment, the recess 53 is provided on the mounting member 40, fixed to the mounting member 40, and fixed to the mounting frame 41. The recessed portion 53 is disposed in the vicinity of the mounting member side pin hole 46 and is disposed closer to the removal side z 1 than the mounting member side pin hole 46. The concave portion 53 is concave (concave shape) in the mounting / removing direction z, and is concave on the mounting side z1. The recess 53 is configured such that the protrusion 51 is inserted into the recess 53 when the mounting member 40 is attached to the main body 10. For example, as shown in FIG. 3, the width of the recess 53 in the pin axis direction y is wider than the width of the protrusion 51 in the pin axis direction y. As shown in FIG. 2, the recess 53 includes a recess bottom 53 a and a recess slope 53 b.

  The recess bottom portion 53 a constitutes a bottom portion of the recess 53. The bottom side of the recess 53 is the removal side z1. The recessed portion bottom portion 53a extends in the mounting / demounting orthogonal direction x, for example, extends linearly as viewed from the pin axial direction y. The concave portion bottom portion 53a is configured (arranged and formed) to be able to contact the convex portion tip portion 51a when the convex portion 51 is inserted into the concave portion 53. The width of the recessed portion bottom portion 53a in the mounting / demounting orthogonal direction x is wider than the width in the mounting / demounting orthogonal direction x of the protrusion front end portion 51a. Therefore, movement of the mounting member 40 in the mounting / demounting orthogonal direction x with respect to the main body 10 is permitted as long as the convex inclined portion 51 b and the concave inclined portion 53 b do not hit.

  The concave portion 53b is formed on both sides (front side X1 and rear side X2) of the concave portion 53 in the mounting / demounting orthogonal direction x. The recessed portion inclined portion 53b is inclined with respect to the mounting / removing direction z such that the gap (the space in which the protruding portion 51 can be inserted) in the mounting / removing orthogonal direction x of the recessed portion 53 becomes narrower toward the bottom side (removal side z1) of the concave portion 53 Do. When the convex portion 51 is inserted into the concave portion 53, the concave portion inclined portion 53b is configured (arranged and formed) to be able to hit the convex portion inclined portion 51b. The concave inclined portion 53b of each of the front side X1 and the rear side X2 linearly extends when viewed from the pin axial direction y. The inclination angle of the recessed portion inclined portion 53b with respect to the mounting / removing direction z may be the same as, for example, the inclination angle with respect to the mounting / removing direction z of the convex portion inclined portion 51b.

  The pinched portion 55 is provided on either of the main body 10 and the attachment member 40. In the present embodiment, the pinched portion 55 is provided on the mounting member 40. As shown in FIG. 4, the pinched portion 55 extends in the attachment / detachment direction z. The pinched portion 55 extends in the mounting / demounting orthogonal direction x. For example, the pinched portion 55 is integrally formed with the mounting frame 41 and configures a part of the mounting frame 41.

  The pinching portion 60 is configured to pinch the pinched portion 55 in the pin axial direction y. The pinching portion 60 is provided on the side of the main body 10 and the attachment member 40 different from the side on which the pinched portion 55 is provided. In the present embodiment, the pinching portion 60 is provided on the main body 10 and fixed to the main body 10. For example, the pinching portion 60 is fixed to the main body side mounting portion 15 and fixed to the support frame 15a. For example, as shown in FIG. 2, the pinching portion 60 is directly fixed to the main body plate portion 15 b. The pinching portion 60 may not be directly fixed to the main body plate portion 15b, and may be provided at a position away from the main body plate portion 15b. As shown in FIG. 4, the pinching portion 60 includes a first pinching portion 61 and a second pinching portion 62. In the pin axial direction y, the side toward the gap of the sandwiching portion 60 from the sandwiching portion 60 is taken as the sandwiching portion inside ya. The side toward the sandwiching portion 60 from the gap of the sandwiching portion 60 is referred to as a sandwiching portion outer side yb.

  The first pinching portion 61 is disposed on one side of the pinched portion 55 in the pin axis direction y (right side in FIG. 4). The first pinching portion 61 includes, for example, a columnar first pinching portion main body portion 61 a and a first pinching portion inclined portion 61 b. The end of the first pinching portion main body portion 61a at the pinching portion inner side ya is arranged to be aligned with the end of the pinching portion inner side ya of the main body plate portion 15b (the same applies to the second pinching portion main portion 62a). The first pinching portion inclined portion 61 b is provided at the removal side z1 end of the first pinching portion 61. The first pinched portion inclined portion 61b is tilted with respect to the mounting and demounting direction z so as to be disposed on the pinched portion inner side ya as to the attachment side z2. The first pinching portion inclined portion 61b extends linearly as viewed in the mounting / demounting orthogonal direction x.

  The second pinching portion 62 is disposed on the opposite side (left side in FIG. 4) to the side of the pinched portion 55 where the first pinching portion 61 is disposed. The first pinching portion 61 and the second pinching portion 62 are disposed so as to sandwich the pinching portion 55 between the first pinching portion 61 and the second pinching portion 62. For example, the second pinching portion 62 may be configured to be symmetrical (left-right symmetric) with the first pinching portion 61 in the pin axis direction y, for example, and may not be configured to be laterally symmetric. The first pinching portion 61 and the second pinching portion 62 are disposed to face each other in the pin axis direction y. The first pinching portion 61 and the second pinching portion 62 may not be opposed in the pin axis direction y, and may be shifted in the mounting / demounting orthogonal direction x. The second pinching portion 62 includes, for example, a columnar second pinching portion main body portion 62a and a second pinching portion inclined portion 62b. The second pinching portion inclined portion 62 b is provided at the removal side z1 end of the second pinching portion 62. The second pinched portion inclined portion 62b is tilted with respect to the attaching / detaching direction z such that the second pinched portion inclined portion 62b is disposed on the pinched portion inside ya as to the attachment side z2.

(Operation)
The outline of the operation of the mounting and demounting mechanism 1 shown in FIG. 1 is as follows. At the time of assembly of the construction machine, the mast 30 to which the mounting member 40 is attached is attached to the main body 10. Next, as shown in FIG. 6, the attachment member 40 is attached to the main body 10. Next, as shown in FIG. 7, the mounting member 40 is removed from the mast 30. Further, at the time of disassembly of the construction machine, the mounting member 40 is removed from the main body 10 and mounted on the mast 30 as shown in FIG. The details of this operation are as follows.

(Attachment of the mast 30 to the main body 10)
The state of the detaching mechanism 1 before assembly of the construction machine is as follows. The mast 30 is removed from the main body 10. The mounting member 40 is attached to the mast 30. The mounting frame 41 is mounted to the mast side mounting portion 35. From this state, the mast 30 is attached to the main body 10 as follows. The mast 30 is lifted by an assembly crane or the like (not shown) and attached to the main body 10. At this time, the mast foot 33 is fixed by the mast foot pin 12. At this time, the mast 30 is raised relative to the main body 10 so that the tip end of the mast 30 is disposed on the upper side Z1 and the rear side X2 of the mast foot 33. At this time, the angle of the mast 30 with respect to the upper surface of the main body 10 is, for example, about 10 °.

(Attachment of mounting member 40 to main body 10)
The mast 30 is then laid down (rotated) about the mast foot pin 12. The orientation of the fall of the mast 30 at this time is the direction in which the tip of the mast 30 moves to the lower side Z2. The mounting member 40 is rotated about the mast foot pin 12 to the lower side Z <b> 2 as the mast 30 falls. Then, the position of the mounting member 40 with respect to the main body 10 is guided by the guide member 50 shown in FIG. This guide includes a guide by the pinched portion 55 and the pinch portion 60, and a guide by the convex portion 51 and the concave portion 53.

  The guide by the pinched portion 55 and the pinched portion 60 shown in FIG. 5 is performed as follows. The pinched portion 55 moves to the attachment side z 2 and approaches the pinching portion 60. At this time, when the pinched portion 55 is deviated in the pin axis direction y with respect to the gap C1 (details are described below), the attachment side z2 end of the pinched portion 55 is the first pinched portion inclined portion 61b or the second pinched portion 61b. It hits the pinching portion inclined portion 62b and moves to the pinching portion inner side ya. Thus, the position of the pinched portion 55 in the pin axis direction y is guided (restricted). Then, the pinched portion 55 is inserted into the gap C1 of the pinching portion 60. As a result, the position in the pin axial direction y of the mounting member 40 with respect to the main body 10 is positioned at a predetermined position.

  The guide by the convex portion 51 and the concave portion 53 shown in FIG. 2 is performed as follows. The recess 53 moves to the attachment side z 2 and approaches the protrusion 51. At this time, when the position of the concave portion 53 with respect to the convex portion 51 is shifted in the attachment / detachment orthogonal direction x, the concave inclined portion 53b abuts on the convex inclined portion 51b and slides relative to the convex inclined portion 51b. As described above, the position of the concave portion 53 in the mounting / demounting orthogonal direction x with respect to the convex portion 51 is guided. As a result, the position of the mounting member 40 with respect to the main body 10 in the mounting / demounting orthogonal direction x is guided. Further, when the recess 53 is moved to the attachment side z2, the recess bottom 53a abuts on the protrusion tip 51a. Therefore, the movement of the concave portion 53 with respect to the convex portion 51 to the attachment side z2 is restricted. As a result, the position of the mounting member 40 with respect to the main body 10 in the mounting / removing direction z is regulated (guided). As a result, the deviation between the main body side pin hole 16 and the mounting member side pin hole 46 (the deviation of the pin hole H) falls within a predetermined range (is contained). Thus, when the mast 30 is laid down with the mast foot pin 12 shown in FIG. 1 as a center, the displacement of the pin hole H shown in FIG. 2 automatically falls within a predetermined range.

  When the recessed portion bottom portion 53a shown in FIG. 3 is in contact with the convex portion tip portion 51a, the central axis of the mounting member side pin hole 46 is disposed closer to the mounting side z2 than the central axis of the main body side pin hole 16. In this state, the pin 21 is inserted into the pin hole H by the cylinder 23 (using the thrust of the cylinder 23). Then, the tapered portion 21t contacts the mounting member side pin hole 46, and moves the mounting member side pin hole 46 to the removal side z1 (pushes up, lifts). Then, the central axis of the main body side pin hole 16 and the central axis of the mounting member side pin hole 46 are aligned (coaxially or substantially coaxial). Then, the pin 21 is completely inserted into the pin hole H. As a result, as shown in FIG. 2, a gap (slight clearance) in the mounting / demounting direction z is generated between the concave portion 53 and the convex portion 51. As a result, the mounting member 40 is mounted to the main body side mounting portion 15. Note that, as shown in FIG. 1, when the main body side attachment portion 17 similar to the main body side attachment portion 15 is provided, the attachment member 40 is attached to the main body side attachment portion 17.

  Unlike the present embodiment, when the recessed portion bottom portion 53a shown in FIG. 3 is in contact with the protruding portion tip portion 51a, the central axis of the mounting member side pin hole 46 is on the removal side z1 than the central axis of the main body side pin hole 16. When arranged (not shown), the pin 21 can not be inserted into the pin hole H. The reason is that when the recess bottom 53a is in contact with the protrusion tip 51a, the mounting member 40 can not move to the mounting side z2 with respect to the main body 10, so the mounting member side pin hole 46 is attached to the main body side pin hole 16 at the mounting side z2. Because you can not move to

(Removal of mounting member 40 from mast 30)
As shown in FIG. 6, after the mounting member 40 is mounted to the main body side mounting portion 15, the mounting member 40 is removed from the mast side mounting portion 35. For example, the pin connecting the mounting frame 41 and the mast side mounting portion 35 shown in FIG. 5 is removed.

  As shown in FIG. 6, the lower spreader 38 is attached to the lower spreader joint 13 in the same manner as the attachment member 40 is attached to the main body side attachment 15. Also, the lower spreader 38 is removed from the main column 31. In addition, when the main pillar 31 and the lower spreader 38 are connected via a link, the link may be stored in the main body 10 or the like. Thereafter, as shown in FIG. 7, the mast 30 is raised relative to the main body 10.

(Mounting of the mounting member 40 to the mast 30)
At the time of disassembly of the construction machine, as shown in FIG. 6, the mast 30 is laid down. Then, the mounting member 40 is removed from the main body 10 and attached to the mast 30. At this time, the mounting frame 41 shown in FIG. 5 is inserted into the mast side mounting portion 35. And the attachment frame 41 and the mast side attachment part 35 are connected by a pin. As a result, the mounting member 40 is mounted to the mast side mounting portion 35. Further, the lower spreader 38 shown in FIG. 6 is removed from the lower spreader connecting portion 13 and attached to the main pillar 31.

(About the gap of the pinching part 60 etc.)
The clearance of the pinching portion 60 shown in FIG. 5 will be described. Below, the case where it sees from pin axial direction y is demonstrated. In the gaps, there are a gap C1, a gap C2, and a gap C3. The clearance C1 is a clearance between the first pinching portion main body portion 61a and the second pinching portion main body portion 62a in the pin axis direction y. The gap C2 is a gap in the pin axial direction y of a portion of the mast side attachment portion 35 which sandwiches the attachment frame 41. The clearance C3 is a clearance in the pin axis direction y between the end on the removal side z1 of the first pinching portion inclined portion 61b and the end on the removal side z1 of the second pinching portion inclined portion 62b.

  The size of the gap C1 is set larger than the dimension (thickness) of the pinched portion 55 in the pin axis direction y. Here, when an error occurs in the attachment (welding) position of the sandwiching portion 60 to the main body 10, an error occurs in the size of the gap C1. Therefore, the clearance C2 and the clearance C3 are set in consideration of the state where the tolerance of the clearance C1 is the largest (worst). For example, the gap C2 is set to the sum (or more) of the ideal gap C1 and the maximum tolerance of the gap C1. When the mounting frame 41 mounted on the main body side mounting portion 15 shown in FIG. 4 is brought close to the mast side mounting portion 35 shown in FIG. Interference can be suppressed. Further, similarly to the setting of the gap C2, the gap C3 is set to the sum (or more) of the ideal gap C2 and the maximum tolerance of the gap C2. By setting the gap C3, when the mounting frame 41 mounted on the mast side mounting portion 35 is brought close to the main body side mounting portion 15, it is possible to prevent the pinched portion 55 from being caught by the pinching portion 60. At this time, it can be suppressed that the pinched portion 55 is caught by the pinching portion 60 and the mounting frame 41 can not move to the mounting side z2 with respect to the main body side mounting portion 15.

  Unlike the present embodiment, when the first pinched portion inclined portion 61b and the second pinched portion inclined portion 62b are not provided (when the gap C3 is equal to the gap C1), the following problem may occur. In this case, there is a possibility that the members may interfere with each other in the smaller one of the gap C1 and the gap C2. For example, when the clearance C1 is narrower than the clearance C2, the pinched portion 55 may interfere with the pinching portion 60 when the mounting frame 41 mounted to the mast side mounting portion 35 is brought close to the main body mounting portion 15 . For example, when the clearance C2 is narrower than the clearance C1, there is a possibility that the mounting frame 41 may interfere with the mast side mounting portion 35 when the mounting frame 41 mounted to the main body side mounting portion 15 approaches the mast side mounting portion 35. is there. On the other hand, in the present embodiment, these interferences can be suppressed. Therefore, it is not necessary to widen the gap C1 and the gap C2 in order to suppress interference.

(Effect of the first invention)
The effects of the mounting and demounting mechanism 1 shown in FIG. 1 are as follows. The mounting and demounting mechanism 1 includes a main body 10, a mast 30, a mounting member 40, and a guide member 50. The main body 10 is an upper main body of the construction machine, and has a main body side pin hole 16 (see FIG. 2). The mast 30 is movably coupled to the body 10 relative to the body 10. The mounting member 40 is detachable from the mast 30, is detachable from the main body 10, and has a mounting member side pin hole 46 shown in FIG. The guide member 50 guides the position of the mounting member 40 with respect to the main body 10. The mounting and demounting direction of the mounting member 40 with respect to the main body 10 is taken as a mounting and demounting direction z. The axial direction of the pin 21 inserted into the main body side pin hole 16 and the mounting member side pin hole 46 is taken as a pin axial direction y. A direction orthogonal to the mounting and demounting direction z and the pin axis direction y is taken as a mounting and demounting orthogonal direction x. The guide member 50 includes a protrusion 51 and a recess 53. The convex part 51 is provided in either of the main body 10 and the attachment member 40, and is convex in the attachment / detachment direction z. The recess 53 is provided on the side of the main body 10 and the attachment member 40 different from the side on which the protrusion 51 is provided. When the mounting member 40 is attached to the main body 10, the convex portion 51 is inserted into the concave portion 53. The convex portion 51 includes a convex portion distal end portion 51 a and a convex portion inclined portion 51 b. The recess 53 includes a recess bottom 53a and a recess slope 53b.

[Structure 1-1] The convex portion front end portion 51 a constitutes a front end side portion of the convex portion 51.
[Configuration 1-2] The convex portion inclined portion 51b is formed on both outer sides in the mounting / demounting orthogonal direction x with respect to the projection tip portion 51a, and the mounting / demounting orthogonal direction of the projection 51 toward the tip end side (removal side z1) of the projection 51 It inclines with respect to the attachment or detachment direction z so that the width in x becomes narrow.
[Configuration 1-3] The recess bottom portion 53a constitutes the bottom side portion of the recess 53, and is configured such that the protrusion distal end portion 51a can hit when the protrusion 51 is inserted into the recess 53.
[Configuration 1-4] The recess slope portion 53b is formed on both outer sides in the attachment / detachment orthogonal direction x than the recess bottom portion 53a, and the gap in the attachment / deposition orthogonal direction x of the recess 53 is narrower toward the bottom side (removal side z1) of the recess 53 It inclines to attachment or detachment direction z so that it may become. The recessed portion inclined portion 53 b is configured to be able to contact the protruding portion inclined portion 51 b when the protruding portion 51 is inserted into the recessed portion 53.
[Configuration 1-5] The convex portion 51 and the concave portion 53 are configured such that when the convex portion 51 is inserted into the concave portion 53, the displacement between the main body side pin hole 16 and the mounting member side pin hole 46 falls within a predetermined range. Be done.

  When the mounting member 40 is attached to the main body 10 mainly by the above [Configuration 1-1] and [Configuration 1-3], the convex portion 51 is inserted into the concave portion 53, and the convex portion tip portion 51a hits the concave portion bottom portion 53a. . Therefore, the movement and the position of the mounting member 40 with respect to the main body 10 in the mounting and removing direction z are guided (restricted). Further, according to the [Configuration 1-2] and [Configuration 1-4], when the mounting member 40 is attached to the main body 10, the convex portion 51 is inserted into the concave portion 53, and the concave portion inclined portion 53b and the convex portion inclined portion 51b It is hit. Therefore, the movement and the position of the mounting member 40 in the mounting / demounting orthogonal direction x with respect to the main body 10 are guided. Therefore, when the mounting member 40 is attached to the main body 10 by the above [Configuration 1-1] to [Configuration 1-5], the displacement between the main body side pin hole 16 and the mounting member side pin hole 46 is within a predetermined range (pins 21 within the allowable range of plugging). Therefore, the time and effort required for the alignment of the pin holes H can be suppressed.

  As a result of obtaining the above effects, the following effects may be obtained. The mounting member 40 shown in FIG. 1 is detachable from the mast 30 and detachable from the main body 10. Thus, the mounting member 40 can be mounted to the main body 10 in a state where the mounting member 40 is mounted to the mast 30. Here, when the mounting member 40 attached to the mast 30 is attached to the main body 10, the position of the attachment member 40 relative to the main body 10 as compared to the case where the mounting member 40 removed from the mast 30 is attached to the main body 10. Difficult to adjust. However, in the mounting and demounting mechanism 1 of the present embodiment, the position of the mounting member 40 with respect to the main body 10 is guided by the guide member 50. Therefore, even when the mounting member 40 is attached to the mast 30, it is easy to align the pin holes H (see FIG. 2). The mounting member 40 may be mounted to the main body 10 in a state where the mounting member 40 is removed from the mast 30.

(Effect of the second invention)
[Configuration 2] The guide member 50 (at least a part) shown in FIG. 2 is fixed to the main body 10 and the mounting member 40 by welding.

  According to the above [Configuration 2], even when a load is applied to the guide member 50, the guide member 50 does not shift with respect to the main body 10 and the mounting member 40. Therefore, position alignment of the pin hole H using the guide member 50 can be performed reliably (every time, smoothly). Therefore, the time and effort required for the alignment of the pin holes H can be suppressed.

  The details of this effect are as follows. For example, when the guide member 50 is fixed to at least one of the main body 10 and the mounting member 40 by a fastening member such as a bolt, the following problems occur. In this case, when the mounting member 40 is attached to and detached from the main body 10, vibration is generated during transportation, etc., a load is applied to the guide member 50, and the position or angle of the guide member 50 relative to the main body 10 or the mounting member 40 may be shifted. Therefore, when the mounting member 40 is attached to the main body 10, the displacement between the main body side pin hole 16 and the mounting member side pin hole 46 may not fall within the predetermined range, and the pin 21 may not be inserted into the pin hole H. . Therefore, it is necessary to adjust the position of the guide member 50 with respect to the main body 10 or the mounting member 40 so that the pin 21 can be inserted into the pin hole H, which takes time and labor.

(Effect of the third invention)
[Configuration 3] The recess bottom 53a extends in the mounting / demounting orthogonal direction x. The width of the recessed portion bottom portion 53a in the mounting / demounting orthogonal direction x is wider than the width in the mounting / demounting orthogonal direction x of the convex portion front end portion 51a.

  By the above [Configuration 3], when the convex portion 51 is inserted into the concave portion 53, the convex portion 51 can move in the mounting / demounting orthogonal direction x with respect to the concave portion 53.

(Effect of the fourth invention)
[Configuration 4] The convex portion tip 51a extends in the mounting / demounting orthogonal direction x.

  By the above [Configuration 3] and [Configuration 4], when the protrusion 51 is inserted into the recess 53, the protrusion 51 can be easily moved in the mounting / demounting orthogonal direction x with respect to the recess 53.

(Effects of the fifth invention)
As shown in FIG. 3, the direction of movement of the mounting member 40 with respect to the main body 10 when the mounting member 40 is mounted to the main body 10 in the mounting / removing direction z is the mounting side z2. The pin 21 includes a tapered portion 21 t formed at the tip of the pin 21.
[Configuration 5] When the recessed portion bottom portion 53a is in contact with the protruding portion tip portion 51a, the central axis of the mounting member side pin hole 46 is disposed closer to the mounting side z2 than the central axis of the main body side pin hole 16.

  The mounting and demounting mechanism 1 includes the above [Configuration 5]. Therefore, when trying to insert the pin 21 into the pin hole H, the tapered portion 21t can move the mounting member side pin hole 46 to the opposite side (removal side z1) to the mounting side z2. Therefore, the position of the central axis of the main body side pin hole 16 and the central axis of the mounting member side pin hole 46 can be matched, and the pin 21 can be inserted into the pin hole H.

(Effect of the sixth invention)
As shown in FIG. 4, the guide member 50 includes a pinched portion 55 and a pinching portion 60.
[Configuration 6] The pinched portion 55 is provided on either of the main body 10 and the attachment member 40, and extends in the mounting / demounting direction z. The pinching portion 60 is provided on the side of the main body 10 and the attachment member 40 different from the side on which the pinched portion 55 is provided. When the attachment member 40 is attached to the main body 10, the pinching portion 60 is configured such that the pinched portion 55 is inserted and pinches the pinched portion 55 in the pin axial direction y.

  According to the above [Configuration 6], when the pinched portion 55 is pinched by the pinching portion 60, the position of the mounting member 40 with respect to the main body 10 in the pin axial direction y can be guided. Therefore, attachment of the attachment member 40 to the main body 10 can be performed easily.

(Effect of the seventh invention)
The pinching portion 60 includes a first pinching portion 61 and a second pinching portion 62. The first pinching portion 61 is disposed on one side of the pinched portion 55 in the pin axis direction y. The second pinching portion 62 is disposed on the opposite side to the side of the pinched portion 55 where the first pinching portion 61 is disposed. The direction of movement of the mounting member 40 with respect to the main body 10 when the mounting member 40 is mounted on the main body 10 in the mounting / removing direction z is referred to as a mounting side z2. In the pin axial direction y, the side from the sandwiching portion 60 toward the gap of the sandwiching portion 60 is referred to as a sandwiching portion inside ya.

  [Configuration 7] The first pinching portion 61 includes a first pinching portion inclined portion 61b that is inclined with respect to the mounting and dismounting direction z so as to be disposed on the pinching portion inside ya as to the attachment side z2. The second pinching portion 62 includes a second pinching portion inclined portion 62b that is inclined with respect to the mounting and dismounting direction z so as to be disposed on the pinching portion inside ya as to the attachment side z2.

  The mounting and demounting mechanism 1 includes the above [Configuration 7]. Therefore, when the attachment member 40 is attached to the main body 10, the pinched portion 55 is pinched when the pinched portion 55 abuts on at least one of the first pinched portion inclined portion 61b and the second pinched portion inclined portion 62b. Easy to move inside ya. Therefore, the pinched portion 55 is easily inserted into the pinching portion 60.

Second Embodiment
The difference between the first embodiment and the attachment / detachment mechanism 201 according to the second embodiment will be described with reference to FIG. As shown in FIG. 4, in the first embodiment, the positions of the first pinching portion inclined portion 61 b and the second pinching portion inclined portion 62 b in the attachment / detachment direction z are the same. On the other hand, as shown in FIG. 8, in the second embodiment, the second pinching portion inclined portion 262b is disposed closer to the attachment side z2 than the first pinching portion inclined portion 261b. The removal side z1 end of the second pinched portion inclined portion 262b is disposed closer to the attachment side z2 than the removal side z1 end of the first pinched portion inclined portion 261b. The attachment side z2 end of the second pinched portion inclined portion 262b is disposed closer to the attachment side z2 than the attachment side z2 end of the first pinched portion inclined portion 261b.

(Effect of the eighth invention)
The effects of the attachment / detachment mechanism 201 shown in FIG. 8 are as follows.
[Configuration 8] The second pinched portion inclined portion 262b is disposed closer to the attachment side z2 than the first pinched portion inclined portion 261b.

  According to the above [Configuration 8], the pinched portion 55 is easily inserted between the pinching portions 60. More specifically, as shown in FIG. 4, when the positions of the first pinching portion inclined portion 61 b and the second pinching portion inclined portion 62 b in the mounting / dismounting direction z are the same, the following problem may occur. For example, when attaching the mounting member 40 to the main body 10, the pinched portion 55 abuts on the first pinching portion main body portion 61a. Then, the pinched portion 55 moves to the second pinched portion inclined portion 62b side and hits the second pinched portion inclined portion 62b. Then, the pinched portion 55 moves to the first pinched portion inclined portion 61b side and hits the first pinched portion inclined portion 61b. As described above, since the pinched portion 55 contacts the first pinched portion inclined portion 61b and the second pinched portion inclined portion 62b, the pinched portion 55 may be difficult to be inserted between the pinched portions 60. On the other hand, in the above [Configuration 8], the above problem is suppressed. Therefore, the pinched portion 55 shown in FIG. 8 is easily inserted between the pinched portions 60.

(Modification)
The arrangement, the shape, the number, and the like of the components of the above embodiment may be changed. Some of the components may not be provided. Fixing of components may be direct or indirect. The connection of components may be direct or indirect. For example, the above embodiment may be modified as follows.

  The attachment / detachment orthogonal direction x, the pin axis direction y, and the attachment / detachment direction z coincide (or substantially coincide) with the longitudinal direction X, the lateral direction Y, and the vertical direction Z, respectively, in the above embodiment. However, the attachment / detachment orthogonal direction x may not be the longitudinal direction X, the pin axis direction y may not be the lateral direction Y, and the attachment / detachment direction z may not be the vertical direction Z.

  The connecting member connected to the main body 10 shown in FIG. 1 is the mast 30 in the above embodiment, but may not be the mast 30. The mounting member 40 has the winch 43 in the above embodiment, but may not have the winch 43. The “attachment member” detachable from the connection member and the main body 10 may not be the attachment member 40, and may be, for example, the lower spreader 38 or the like. The lower spreaders 38 may be rotatable relative to the main body 10 about an axis in the lateral direction Y or non-rotatable. Among them, the guide member 50 including the convex portion 51 and the concave portion 53 shown in FIG. 2 may be applied to the lower spreader 38 which can not rotate around the axis in the lateral direction Y with respect to the main body 10.

  In the embodiment, the convex portion 51 and the pinching portion 60 are provided in the main body 10, and the concave portion 53 and the pinched portion 55 are provided in the mounting member 40. On the other hand, the convex part 51 may be provided in the attachment member 40 and the concave part 53 may be provided in the main body 10. Further, the pinched portion 55 may be provided in the main body 10 and the pinching portion 60 may be provided in the attachment member 40. In the above embodiment, the convex portion 51 is convex on the removal side z1, and the concave portion 53 is concave on the removal side z1. On the other hand, the convex portion 51 may be convex on the attachment side z2, and the concave portion 53 may be concave on the attachment side z2.

  The convex portion 51 has a trapezoidal shape as viewed from the pin axis direction y in the above embodiment, but may have a triangular shape (including a substantially triangular shape) or the like. The main body side pin hole 16 is disposed in the vicinity of the guide member 50 (convex portion 51) on the main body 10 side in the above embodiment, but may not be disposed in the vicinity of the guide member 50 on the main body 10 side.

  In the example shown in FIG. 1, the main body side mounting portion 15 supports the front side X1 end portion of the mounting member 40, and the main body side mounting portion 17 supports the rear side X2 end portion of the mounting member 40. On the other hand, the configuration (arrangement, number, etc.) of the members that support the mounting member 40 with respect to the main body 10 may be changed.

1, 201 Attachment / detachment mechanism 10 Main body 16 Main body side pin hole 21 Pin 21 t Tapered portion 30 Mast (connection member)
40 mounting member 46 mounting member side pin hole 50 guide member 51 convex portion 51a convex portion tip portion 51b convex portion inclined portion 53 concave portion 53a recessed portion bottom portion 53b recessed portion inclined portion 55 pinched portion 60 pinched portion 61 first pinched portion 61b, 261b One pinching part inclined part 62 Second pinching part 62b, 262b Second pinching part inclined part y Pin axial direction ya Clamping part inside z Detaching direction z2 Attached side

Claims (8)

A body having a body side pin hole which is an upper body of the construction machine;
A connecting member movably connected to the main body with respect to the main body;
A mounting member which is removable from the connecting member, removable from the main body, and having a mounting member side pin hole;
A guide member for guiding the position of the mounting member relative to the main body;
Equipped with
The mounting and demounting direction of the mounting member with respect to the main body is a mounting and demounting direction,
The axial direction of the pin inserted into the main body side pin hole and the mounting member side pin hole is taken as the pin axial direction,
The direction perpendicular to the mounting and demounting direction and the pin axis direction is the mounting and demounting direction,
The guide member is
A convex portion which is provided on any of the main body and the mounting member and which is convex in the mounting and demounting direction;
A concave portion provided on the side different from the side on which the convex portion is provided among the main body and the mounting member, and a concave portion into which the convex portion is inserted when the mounting member is attached to the main body;
Equipped with
The convex portion is
A protrusion tip end portion that constitutes a tip end side portion of the protrusion;
A convex portion inclined portion which is formed on both outer sides in the mounting / demounting orthogonal direction than the front end portion of the projection, and is inclined with respect to the mounting / demounting direction such that the width of the projection in the mounting / demounting orthogonal direction becomes narrower toward the front end side of the projection. When,
Equipped with
The recess is
A recess bottom portion which constitutes a bottom side portion of the recess and is configured such that the tip end of the protrusion can hit when the protrusion is inserted into the recess;
The recess is formed at both outer sides in the mounting and demounting orthogonal direction than the recess bottom, and the recess is inclined with respect to the mounting and removing direction so that the gap in the mounting and demounting orthogonal direction becomes narrower toward the bottom of the recess. A recess slope configured to be able to hit the protrusion slope when being
Equipped with
The convex portion and the concave portion are configured such that when the convex portion is inserted into the concave portion, the displacement between the main body side pin hole and the attachment member side pin hole falls within a predetermined range .
Each of the convex sloped portion on both sides in the mounting and demounting orthogonal direction and the concaved sloped portion on both sides in the mounting and demounting orthogonal direction extend linearly as viewed from the pin axial direction,
The inclination angle of the recessed portion inclined portion with respect to the mounting and demounting direction is the same as the inclination angle of the convex portion inclined portion with respect to the mounting and demounting direction
Detachment mechanism. The detaching mechanism according to claim 1, wherein
The guide member is fixed to the main body and the attachment member by welding.
Detachment mechanism. It is an attachment or detachment mechanism of Claim 1 or 2, Comprising:
The recess bottom extends in the mounting / demounting direction,
The width of the recess bottom portion in the mounting / demounting orthogonal direction is wider than the width in the mounting / demounting direction of the tip of the projection.
Detachment mechanism. The detaching mechanism according to claim 3, wherein
The tip of the convex portion extends in the mounting / demounting orthogonal direction.
Detachment mechanism. It is the attachment or detachment mechanism of any one of Claims 1-4, Comprising:
In the mounting and demounting direction, the direction of movement of the mounting member relative to the main body when mounting the mounting member to the main body is a mounting side,
The pin includes a tapered portion formed at the tip of the pin,
The central axis of the mounting member side pin hole is disposed on the mounting side relative to the central axis of the main body side pin hole when the recess bottom portion is in contact with the tip end portion of the convex portion.
Detachment mechanism. A body having a body side pin hole which is an upper body of the construction machine;
A connecting member movably connected to the main body with respect to the main body;
A mounting member which is removable from the connecting member, removable from the main body, and having a mounting member side pin hole;
A guide member for guiding the position of the mounting member relative to the main body;
Equipped with
The mounting and demounting direction of the mounting member with respect to the main body is a mounting and demounting direction,
The axial direction of the pin inserted into the main body side pin hole and the mounting member side pin hole is taken as the pin axial direction,
The direction perpendicular to the mounting and demounting direction and the pin axis direction is the mounting and demounting direction,
The guide member is
A pinched portion provided on any of the main body and the attachment member and extending in the mounting and demounting direction;
The main body and the attachment member are provided on the side different from the side where the pinched portion is provided, and the pinched portion is inserted when the attachment member is attached to the main body, and the pinched portion is a pin shaft A clamp configured to sandwich from a direction;
A convex portion which is provided on any of the main body and the mounting member and which is convex in the mounting and demounting direction;
A concave portion provided on the side different from the side on which the convex portion is provided among the main body and the mounting member, and a concave portion into which the convex portion is inserted when the mounting member is attached to the main body;
Equipped with
The convex portion is
A protrusion tip end portion that constitutes a tip end side portion of the protrusion;
A convex portion inclined portion which is formed on both outer sides in the mounting / demounting orthogonal direction than the front end portion of the projection, and is inclined with respect to the mounting / demounting direction such that the width of the projection in the mounting / demounting orthogonal direction becomes narrower toward the front end side of the projection. When,
Equipped with
The recess is
A recess bottom portion which constitutes a bottom side portion of the recess and is configured such that the tip end of the protrusion can hit when the protrusion is inserted into the recess;
The recess is formed at both outer sides in the mounting and demounting orthogonal direction than the recess bottom, and the recess is inclined with respect to the mounting and removing direction so that the gap in the mounting and demounting orthogonal direction becomes narrower toward the bottom of the recess. A recess slope configured to be able to hit the protrusion slope when being
Equipped with
The convex portion and the concave portion are configured such that when the convex portion is inserted into the concave portion, the displacement between the main body side pin hole and the attachment member side pin hole falls within a predetermined range.
Detachment mechanism. The detaching mechanism according to claim 6, wherein
The pinch portion is
A first pinching portion disposed on one side in a pin axial direction with respect to the pinched portion;
A second pinching portion disposed on the side opposite to the side on which the first pinching portion is disposed with respect to the pinched portion;
Equipped with
In the mounting and demounting direction, the direction of movement of the mounting member relative to the main body when mounting the mounting member to the main body is a mounting side,
In the pin axis direction, the side from the sandwiching portion toward the gap of the sandwiching portion is the inside of the sandwiching portion,
The first pinching portion includes a first pinching portion inclined portion which is inclined with respect to the attaching and detaching direction such that the first pinching portion is disposed inside the pinching portion toward the attachment side,
The second pinching portion includes a second pinching portion inclined portion which is inclined with respect to the attaching / detaching direction such that the second pinching portion is disposed inside the pinching portion toward the attachment side.
Detachment mechanism. The detaching mechanism according to claim 7, wherein
The second pinched portion inclined portion is disposed closer to the attachment side than the first pinched portion inclined portion.
Detachment mechanism.

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