JP6597758B2 - Retaining device and work machine having the same - Google Patents

Description

  The present invention relates to a retaining device and a work machine including the retaining device.

  2. Description of the Related Art Conventionally, a work machine is provided with a retaining device for preventing a pin inserted into a pin hole of a hole member from slipping out of the pin hole. Patent Document 1 below discloses an example of such a retaining device.

  Specifically, in Patent Document 1 below, in a mobile crane, when an optional device such as an optional winch is not mounted on the upper swing body, an alternative weight as an alternative to the optional device is provided on the upper side to secure a stable moment of the crane. The structure installed in a revolving structure is disclosed, and a bounce-off link for fixing the substitute weight to the upper revolving structure is connected to a mounting plate of the upper revolving structure with a pin. In the configuration of this Patent Document 1, a retaining device is provided to prevent the pin that connects the splash preventing link to the mounting plate.

  Specifically, in the configuration of Patent Document 1, a mounting plate is erected on a horizontal plate provided on the upper swing body, and between a fork portion composed of a pair of plate-like portions provided on a splash-fastening link. The mounting plate is inserted in Then, the pin is inserted into the pin hole provided in the attachment plate and the pin hole provided in the fork portion, so that the fork portion of the bounce-off link is connected to the attachment plate.

  The retaining device provided in the configuration of Patent Document 1 includes a key plate and a bolt. The pin has a portion that protrudes in the direction in which the pin is pulled out from the fork portion of the bounce-off link in a state of being inserted into the pin hole, and a key groove extending in the circumferential direction is formed on the outer peripheral surface of the portion. The key plate is fitted into the key groove. The key plate is overlapped on the surface of the fork portion of the splash-stop link facing the pin exit side and is fastened to the fork portion with a bolt. Thereby, the key plate prevents the pin from moving in the axial direction, and as a result, the pin is prevented from coming out of the pin hole.

JP 2009-107750 A

  According to the retaining device of Patent Document 1, the key plate is fastened to the fork with a bolt. However, in a work machine, the space adjacent to the hole member on the side where the pin is pulled out from the pin hole is a bolt fastening. There are cases where it is so narrow that it is difficult to perform the work, and in this case, the retaining device of Patent Document 1 cannot be adopted.

  The object of the present invention is to attach the retaining member so that the retaining member prevents the pin from slipping out even when the space adjacent to the hole member is narrow on the side where the pin exits from the pin hole. It is an object of the present invention to provide a retaining device capable of easily performing an operation and a work machine including the same.

  The present invention provides a hole member provided with a pin hole, and a shaft member including a pin having a central axis extending in a certain direction and inserted through the pin hole along the central axis. A retaining device for preventing the pin from coming out of the pin hole, provided on a work machine having a withdrawal side surface facing the withdrawal side of the pin from the pin hole. The retaining device is disposed at a position on the withdrawal side with respect to the hole member and fixed to the work machine, and is attached to the fixing portion, and the pin is inserted into the pin hole. A retaining member that prevents the shaft member from moving to the withdrawal side in a state, and the retaining member approaches the fixing portion along an attachment direction that intersects the central axis. A fixing portion that can be attached to the fixing portion; and a retaining portion that prevents the shaft member from moving to the withdrawal side in a state where the attaching portion is attached to the fixing portion. One of the part and the attachment part has a male part extending along the attachment direction, and the other of the fixing part and the attachment part accepts the male part along the attachment direction. Possible female part The retaining member is constrained to a retaining position in the axial direction, which is the direction in which the central axis extends, by fitting with the received male portion, and the retaining portion is configured so that the retaining portion is This is a position where the shaft member is prevented from moving to the withdrawal side by abutting against the withdrawal side surface.

  According to this retaining device, the retaining portion can be attached to the fixing portion only by making the retaining member approach the fixing portion along the mounting direction intersecting the central axis of the pin. The retaining member can be restrained at a retaining position where the retaining member abuts against the withdrawal side surface of the shaft member and prevents the shaft member from moving to the withdrawal side. Even when the space adjacent to the hole member is narrow, the work of attaching the retaining member can be easily performed so that the retaining member is in a state of preventing the pin from coming out of the pin hole.

  Specifically, in this retaining device, the male portion included in one of the fixing portion and the mounting portion of the retaining member extends along the mounting direction of the mounting portion of the retaining member with respect to the fixing portion, and the other has. The female part receives the male part along the mounting direction and engages with the male part to restrain the retaining member at the retaining position, so that the retaining member approaches the fixed part along the mounting direction. By simply fitting the male part and the female part, the attachment part of the retaining member can be attached to the fixed part, and the retaining part is in the retaining position where it comes into contact with the withdrawal side surface of the shaft member. The retaining member can be disposed and restrained at that position. For this reason, even when the space adjacent to the hole member is narrow on the side where the pin is pulled out from the pin hole, it is not necessary to perform the attaching operation of the retaining member in such a narrow space, and The attaching operation of the retaining member can be easily performed.

  The retaining portion includes a first retaining portion and a second retaining portion located on both sides of an opening capable of receiving the shaft member along the mounting direction, and the retaining position is Preferably, the shaft member enters the opening, and the first and second retaining portions are in contact with the withdrawal side surface to prevent the shaft member from moving to the withdrawal side. .

  According to this configuration, in order to fit the male part and the female part, the retaining member is simply moved closer to the fixing part along the mounting direction intersecting the central axis of the pin. The shaft member can be inserted into the opening between the first retaining portion and the second retaining portion, and the retaining member can be installed in a more stable state. Specifically, in a state where the shaft member enters the opening between the first retaining portion and the second retaining portion, the first and second retaining portions are disposed so as to sandwich the shaft member from both sides. Therefore, for example, even when an external force in the rotation direction centering on the male part acts on the retaining member, the first or second retaining part abuts against the shaft member to counter the external force. It is possible to prevent the retaining member from rotating and coming off the shaft member. Therefore, according to this configuration, the retaining member can be installed in a more stable state.

  The retaining device is a receiving portion fixed to the work machine, and the first and second retaining portions are configured to prevent the first and second retaining portions from being displaced toward the withdrawal side. It is preferable to further include one that receives from the exit side.

  According to this configuration, even when the first and second retaining portions contacting the withdrawal side surface of the shaft member receive a force from the shaft member toward the withdrawal side, the first and second retaining portions are received by the receiving portion. 2. The displacement preventing portion is prevented from being displaced toward the exit side. For this reason, it is possible to prevent the retaining member from being deformed by the force and unintentional detachment of the retaining member from the fixed portion and the shaft member.

  The male part and the female part are disposed on one side with respect to the shaft member in the mounting direction, and the first and second retaining portions are disposed on the one side with respect to the shaft member from the one side. It is preferable to extend to the opposite side and to have a tip portion on the opposite side, and the receiving portion receives the tip portion of the first and second retaining portions from the withdrawal side.

  According to this configuration, the portion of the first and second retaining portions that is received from the withdrawal side by the receiving portion is fixed in the mounting direction from the mounting portion that is fixed to the fixing portion by fitting the male portion and the female portion. Since the distal end portion is farthest away, displacement of the retaining portion toward the withdrawal side can be most effectively prevented when the first and second retaining portions receive force from the shaft member toward the withdrawal side.

  The retaining device prevents the retaining member from displacing in a direction away from the fixing portion along the mounting direction in a state where the male portion is fitted to the female portion, and the male portion is disengaged from the female portion. It is preferable to further include a separation preventing unit that prevents separation from the unit.

  According to this configuration, the detachment preventing portion can prevent the male portion from unintentionally detaching from the female portion, and can prevent the retaining member from unintentionally detaching from the fixing portion.

  The fixed portion is a guide portion having a guide hole through which the shaft member is inserted, and guides the shaft member so that the shaft member inserted through the guide hole moves along the axial direction. Preferably there is.

  According to this configuration, the shaft member can be guided so that the shaft member moves along the axial direction, and the pin can be prevented from being displaced when the pin is inserted into and removed from the pin hole. Since the guiding part for guiding and the fixing part to which the retaining member is fixed can be used together, the number of members can be reduced.

  The work machine according to the present invention supports the structure constituting a predetermined part of the work machine, the retaining device, the shaft member, and the shaft member for inserting and removing the pin from the pin hole. And a drive device that moves the device forward and backward along the central axis, and a base on which the fixing portion and the drive device of the retaining device are installed, and is attached to the structure.

  According to this work machine, even when the space adjacent to the pull-out side of the mounting bracket and winch plate is small in the work machine, the retaining member prevents the pin from coming out of the pin hole. It is possible to easily perform the work of attaching the retaining member. Further, in this work machine, the shaft member can be moved back and forth by the drive device so that the pin can be inserted into and removed from the pin hole. Therefore, labor related to the insertion and removal of the pin from the pin hole can be reduced. In addition, it is difficult to perform the work of assembling the fixing unit of the retaining device and the driving device to the structure while adjusting the position of each other in a narrow space adjacent to the pin exit side with respect to the hole member in the work machine. In the work machine, the fixing unit and the driving device of the retaining device are installed on the base, and the base is attached to the structure. Therefore, the fixing unit and the driving device are mounted on the base in a wide place away from the space. After installing while adjusting the position of each other, the base, the fixed part and the drive unit are integrated in the space and the base is attached to the structure to fix the fixed part and the drive to the structure of the work machine The apparatus can be assembled, and there is no need to perform a difficult assembly operation in the narrow space. Therefore, in this work machine, the work of assembling the fixing portion and the drive device to the structure can be facilitated.

  Further, the work machine according to the present invention is the retaining device, the frame of the work machine, a mounting bracket installed on the frame, a winch mounted on the frame, a winch drum, A winch plate that supports the winch drum so that the winch drum can rotate about its central axis, and a shaft member including a connecting pin for connecting the frame and the winch, and The mounting bracket is provided with a first pin hole, the winch plate is provided with a second pin hole, and the connecting pin is inserted into the first pin hole and the second pin hole, and the mounting bracket is inserted. And the winch plate are connected to each other, and the fixing portion is connected to the mounting bracket and the winch plate with respect to the first pin hole and the second pin. The connecting pin is disposed at a position where the connecting pin is pulled out from and fixed to the frame, the retaining member is attached to the fixing portion, and the connecting pin is inserted into the first pin hole and the second pin hole. The shaft member is prevented from moving to the withdrawal side in the inserted state.

  According to this working machine, it is possible to prevent the connecting pin that connects the mounting bracket and the winch plate installed on the frame of the working machine from coming out of the first pin hole of the mounting bracket and the second pin hole of the winch plate. In this working machine, even if the space adjacent to the pull-out side of the mounting bracket and winch plate is narrow, the retaining member prevents the connecting pin from slipping out of the first and second pin holes. Thus, the work of attaching the retaining member can be easily performed.

  As described above, according to the present invention, even when the space adjacent to the hole member is narrow on the side where the pin comes out from the pin hole, the retaining member prevents the pin from coming out. A retaining device capable of easily performing the work of attaching the retaining member and a work machine provided with the retaining device can be provided.

1 is a side view of a crane to which a retaining device according to an embodiment of the present invention is applied. It is the figure which looked at the retaining device of this embodiment in the crane shown by FIG. 1, and its periphery from back. It is a perspective view of the periphery of the fixing | fixed part and shaft member of the state which removed the retaining member in the crane. It is a perspective view of the retaining member of the retaining device according to one embodiment of the present invention. It is sectional drawing along the VV line in FIG. It is a perspective view of the periphery of the retaining device, the fixing portion, and the shaft member in a state where the retaining member is installed in the crane. It is the perspective view which looked at the circumference | surroundings of the retaining device, the fixing | fixed part, and shaft member in the state in which the retaining member was installed in the crane from the angle different from FIG. It is a perspective view which shows the structure of the retaining member, receiving part, and clamping part by one modification of this invention. It is a perspective view of the retaining member by another modification of this invention. It is a perspective view which shows the structure of the retaining member, fixing | fixed part, and receiving part by another modification of this invention. It is the figure which looked at the retaining device by another modification of this invention, and its periphery toward the insertion side of the connection pin along the axial direction of a connection pin. It is the figure which looked at the retainer shown in FIG. 11 and its periphery from upper direction.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows the overall configuration of a crane to which a retaining device 1 according to an embodiment of the present invention is applied, and FIG. 2 shows the retaining mechanism of the present embodiment in the crane shown in FIG. The configuration of the device 1 and its periphery is shown.

  As shown in FIGS. 1 and 2, the retaining device 1 according to the present embodiment includes a winch plate 113 of a winch 105 mounted on a swing frame 103 of an upper swing body 102 of a crane 100 and a mounting bracket 107 of the swing frame 103. Is used to prevent the connecting pin 121 from being connected. In addition, the crane 100 is an example of the working machine in this invention, and the connection pin 121 is an example of the pin in this invention. Hereinafter, first, the configuration of the crane 100 will be described.

  As shown in FIG. 1, the crane 100 includes a lower main body 101 and an upper revolving body 102 that is mounted on the lower main body 101 so as to be rotatable about a vertical axis.

  The upper swing body 102 is mounted on the lower main body 101 so as to be swingable and serves as a base of the upper swing body 102, a winch 105 mounted on the swing frame 103, and the swing frame 103. The mounting bracket 107 is provided.

  The swivel frame 103 is an example of a structure of a work machine according to the present invention, and is an example of a frame of the work machine according to the present invention. As shown in FIG. 2, the swivel frame 103 includes a frame main body 106 on which the winch 105 is installed, and a plurality of base blocks 108 provided on the frame main body 106.

  The mounting bracket 107 is an example of a hole member in the present invention. The mounting bracket 107 has a base portion 109 fixed to the upper surface of the frame body 106 and a pair of plate-like standing portions 110 provided so as to protrude upward from the base portion 109. The pair of standing portions 110 are disposed with a gap therebetween in the width direction of the turning frame 103. The width direction of the turning frame 103 is a direction orthogonal to both the direction in which the turning central axis of the turning frame 103 relative to the lower body 101 extends and the front-rear direction of the upper turning body 102. Each standing portion 110 is arranged so that the thickness direction thereof coincides with the width direction of the turning frame 103. Each standing portion 110 has a pin hole 110a that penetrates the standing portion 110 in the plate thickness direction. The pin hole 110a is an example of a first pin hole in the present invention.

  The plurality of base blocks 108 are provided in a region on the inner side in the width direction of the revolving frame 103 with respect to the mounting bracket 107, and in this region, the base blocks 108 are arranged at intervals. Each base block 108 is installed on the upper surface of the frame main body 106 by being welded to the upper surface of the frame main body 106. Each base block 108 has an unillustrated bolt hole penetrating the base block 108 in the vertical direction.

  The winch 105 is, for example, a hoisting winch that winds / unwinds a hoisting rope to hoist a hoisting member such as a boom, or a hoisting device that winds / feeds a hoisting rope and winds / hangs a suspended load suspended by the hoisting device. A winch or the like for lowering. FIG. 1 shows a winch 105 as a hoisting winch for raising and lowering the boom. As shown in FIG. 2, the winch 105 includes a winch drum 112 for winding a rope, and a winch plate 113 that supports the winch drum 112 so that the winch drum 112 can rotate around its central axis. Have.

  The winch drum 112 is arranged so that its central axis extends in the width direction of the revolving frame 103. The winch drum 112 has a shaft portion 112a at the end of the winch drum 112 in the direction in which the central axis extends.

  The winch plate 113 supports the shaft portion 112 a of the winch drum 112 via the bearing 114. The winch plate 113 has a flat plate shape and is arranged so that the thickness direction thereof coincides with the direction in which the central axis of the winch drum 112 extends and the width direction of the swivel frame 103. A pin hole 113 a that penetrates the winch plate 113 in the thickness direction is provided in a portion near the lower end of the winch plate 113. The winch plate 113 is an example of a hole member in the present invention, and the pin hole 113a is an example of a second pin hole in the present invention. A portion near the lower end of the winch plate 113 is inserted between the pair of standing portions 110 of the mounting bracket 107.

  The upper swing body 102 of the crane 100 further includes a connecting device 120 for connecting the winch plate 113 and the mounting bracket 107 of the swing frame 103. The connecting device 120 is provided on the turning frame 103. The connecting device 120 includes a shaft member 124 including the connecting pin 121, a driving device 126, and a base 128. The connecting device 120 connects the winch plate 113 and the mounting bracket 107 of the swivel frame 103 by inserting the connecting pin 121 into the pin holes 110a and 113a.

  The shaft member 124 includes a connecting pin 121 and a rod 122, and is a member that moves forward and backward in the width direction of the turning frame 103 in order to insert and remove the connecting pin 121 into and from the pin holes 110a and 113a.

  The connecting pin 121 has a central axis extending linearly in a certain direction, and is inserted into and removed from the pin holes 110a and 113a along the direction in which the central axis extends. Hereinafter, the direction in which the central axis of the connecting pin 121 extends is referred to as the axial direction of the connecting pin 121. The connecting pin 121 includes a substantially cylindrical pin main body 131 and a disk-shaped flange 132 having a diameter larger than that of the pin main body 131.

  The pin body 131 of the connecting pin 121 is inserted through the pin holes 110a and 113a. The pin main body 131 is one end that is an end portion on the insertion side of the pin main body 131 into the pin holes 110a and 113a, and another end portion that is on the side where the pin main body 131 is pulled out from the pin holes 110a and 113a. And an end. The one end portion of the pin body 131 is a tip portion of the connecting pin 121.

  The flange 132 is provided at the other end of the pin body 131 so as to be coaxial with the pin body 131. The base portion of the connecting pin 121 is configured by the flange 132. The flange portion 132 has an extraction side surface 132a facing the exit side of the connecting pin 121 from the pin holes 110a and 113a. The extraction side surface 132a is an end surface of the flange portion 132 on the extraction side.

  The connecting pin 121 has an axial direction that coincides with the direction in which the central axis of the winch drum 112 extends and the width direction of the swivel frame 103, and has a distal end portion facing outward in the width direction of the swivel frame 103 and a base end portion thereof. It arrange | positions with the attitude | position which faces the width direction inner side of the turning frame 103. FIG.

  The rod 122 is a cylindrical member, and is connected to the base end portion of the connecting pin 121 so as to be coaxial with the connecting pin 121. In other words, the rod 122 is connected to the flange portion 132 of the connection pin 121 so as to be coaxial with the connection pin 121 and extends from the extraction side surface 132a of the flange portion 132 to the removal side. The rod 122 has an outer diameter that is smaller than the outer diameter of the flange 132. For this reason, a step is formed between the outer peripheral surface of the rod 122 and the outer peripheral surface of the flange 132 at the connection portion between the rod 122 and the flange 132.

  The drive device 126 is a device that moves the shaft member 124 forward and backward in the width direction of the revolving frame 103 along its central axis in order to insert and remove the connecting pin 121 into and from the pin holes 110a and 113a. That is, in this embodiment, the connecting pin 121 is not manually inserted into and removed from the pin holes 110a and 113a, but the driving device 126 moves the shaft member 124 forward and backward to move the connecting pin 121 to the pin holes 110a and 110a. 113a is inserted and removed. The driving device 126 is a hydraulic cylinder, and includes a cylinder body 134, a piston (not shown) provided in the cylinder body 134, and two brackets 136 attached to the outer surface of the cylinder body 134.

  A rod 122 of the shaft member 124 is inserted into the cylinder body 134, and the rod 122 is connected to the piston in the cylinder body 134. The piston is movable in the width direction of the revolving frame 103 within the cylinder body 134. In the drive device 126, the piston 122 moves outward in the width direction of the swivel frame 103 by the hydraulic pressure supplied to the cylinder body 134, so that the rod 122 is advanced from the cylinder body 134 and the connecting pin 121 is inserted into the pin holes 110a and 113a. On the other hand, the piston is moved inward in the width direction of the revolving frame 103 by hydraulic pressure, so that the rod 122 is retracted into the cylinder body 134 and the connecting pin 121 is removed from the pin holes 110a and 113a.

  The base 128 serves as a base for the coupling device 120, and the drive device 126 is installed on the base 128. The base 128 is installed on the turning frame 103 on the inner side in the width direction of the turning frame 103 than the mounting bracket 107. The base 128 includes a base plate 140 and a plurality of brackets 142.

  The base plate 140 is a flat plate and is placed on the plurality of base blocks 108 of the revolving frame 103 and detachably fixed to the base blocks 108. Specifically, the base plate 140 is formed with insertion holes (not shown) penetrating the base plate 140 in the plate thickness direction (vertical direction) at each position corresponding to the bolt hole of each base block 108. The base plate 140 and the base block 108 are fastened by inserting bolts (not shown) into the respective insertion holes and screwing them into the corresponding bolt holes of the base block 108. Therefore, the base plate 140 can be separated from the base block 108 by loosening the bolt and removing the bolt from the bolt hole and the insertion hole.

  The plurality of brackets 142 are attached to the upper surface of the base plate 140. Each bracket 136 of the drive device 126 is pin-coupled to each of these brackets 142 so that the drive device 126 is attached to the base 128.

  The retaining device 1 according to the present embodiment is provided in the upper turning body 102 of the crane 100 having the above-described configuration, and prevents unintentional withdrawal of the connecting pin 121 from the pin holes 110a and 113a. For example, a force that causes the rod 122 to retreat into the cylinder body 134 may be unintentionally generated due to various factors such as an erroneous operation of the drive device 126 or a loss of hydraulic pressure from the cylinder body 134. In addition, the retaining device 1 prevents the shaft member 124 from moving to the withdrawal side, and prevents the connecting pin 121 from coming out of the pin holes 110a and 113a. The retaining device 1 includes a fixing portion 2, a retaining member 4, a receiving portion 6, and a separation preventing portion 8.

  The fixing portion 2 is disposed at a position on the side where the connecting pin 121 is withdrawn with respect to the mounting bracket 107, and is fixed to the turning frame 103 of the upper turning body 102. The fixing portion 2 is to which the retaining member 4 is attached. In the present embodiment, the fixing portion 2 guides the shaft member 124 so that the shaft member 124 moves along the axial direction. It is also a guide part.

  Specifically, the fixing portion 2 is fixed on the base plate 140. That is, the fixing part 2 is fixed to the turning frame 103 via the base plate 140. The fixing portion 2 is a position between the mounting bracket 107 and the driving device 126 on the base plate 140, that is, a position spaced from the mounting bracket 107 to the withdrawal side and spaced from the driving device 126 to the insertion side. Is provided. The fixing portion 2 is erected on the upper surface of the base plate 140.

  As will be described later, the receiving part 6 is also provided on the base plate 140, and the fixing part 2, the receiving part 6 and the connecting device 120 provided on the base plate 140 are unitized. That is, in the present embodiment, the driving device 126, the fixing portion 2, and the receiving portion 6 of the coupling device 120 are installed on the base plate 140, and these are unitized, and the entire unit is placed on the revolving frame 103 and is As described above, the base plate 140 is fastened to the base block 108. Further, by releasing the fastening between the base block 108 and the base plate 140, the entire unit can be detached from the revolving frame 103.

  As shown in FIG. 3, the fixing portion 2 includes a fixing portion main body 12 erected on the base plate 140 and a male portion 13 protruding from the fixing portion main body 12.

  The fixed portion main body 12 has a guide hole 12 a (see FIG. 2) that penetrates the fixed portion main body 12 in the width direction of the turning frame 103. The guide hole 12a is a round hole disposed so as to be coaxial with the pin holes 110a and 113a. The pin body 131 of the connecting pin 121 of the shaft member 124 is inserted into the guide hole 12a, and the fixing portion 2 is inserted into the guide hole 12a when the driving device 126 moves the shaft member 124 forward and backward. The connecting pin 121 is guided so that the pin body 131 moves along the axial direction. As a result, the fixing portion 2 functions as a guide portion that guides the connecting pin 121 (shaft member 124), and when the connecting pin 121 is inserted into and removed from the pin holes 110a and 113a, the fixing portion 2 is inclined or displaced. This prevents the connection pin 121 from being inserted into and removed from the pin holes 110a and 113a.

  The male part 13 is a substantially columnar protrusion extending in a mounting direction, which will be described later, perpendicular to the central axis of the connecting pin 121 (the central axis of the shaft member 124) from the fixed part main body 12. In the present embodiment, the male portion 13 extends upward from the upper end of the fixed portion main body 12. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2 and shows the positional relationship of the male part 13 with respect to the shaft member 124. In FIG. 5, the illustration of the separation preventing unit 8 is omitted. As shown in FIG. 5, the male portion 13 has a direction D (this embodiment) orthogonal to both the axial direction of the connecting pin 121 and the mounting direction described later, as viewed from the axial direction of the connecting pin 121. In the embodiment, the shaft member 124 is disposed in the range of the width W of the shaft member 124 (the width W of the flange 132 of the connecting pin 121) in the horizontal direction and in the front-rear direction of the upper swing body 102. The male portion 13 is arranged so that the center of the width of the shaft member 124 in the direction D substantially coincides with the center of the width of the male portion 13 in the same direction.

  As shown in FIGS. 2 and 6, the retaining member 4 is attached to the fixing portion 2, and the shaft member 124 in the state where the connecting pin 121 is inserted into the pin holes 110 a and 113 a toward the withdrawal side. It prevents movement. The retaining member 4 is detachably attached to the fixed portion 2 and the shaft member 124. The retaining member 4 includes a mounting portion 23 and a retaining portion 25.

  The attachment portion 23 is configured to be attached to the fixed portion 2 by approaching the fixed portion 2 along an attachment direction orthogonal to the central axis of the connecting pin 121. The attachment portion 23 has a flat plate shape, and when the retaining member 4 is attached to the fixing portion 2 and the shaft member 124, the plate thickness direction coincides with the attachment direction (vertical direction in the present embodiment) and the shaft member. It is arranged so as to be adjacent to the flange 132 on the opposite side of the frame main body 106 with respect to 124 (in the present embodiment, on the upper side of the shaft member 124). The attachment portion 23 extends in the width direction of the turning frame 103.

  The attachment portion 23 is a female portion 22 capable of receiving the male portion 13 along the attachment direction, and the retaining portion 4 is retained in the axial direction by fitting with the received male portion 13. It has what is restrained in position. The retaining position is such that the rod 122 of the shaft member 124 enters a later-described opening 28 of the retaining member 4 and the retaining portion 25 abuts against the withdrawing side surface 132a, so that the shaft member 124 moves toward the exit side. It is a position that prevents movement.

  The female portion 22 is a portion in the vicinity of the insertion-side end portion of the attachment portion 23. The female portion 22 has a fitting hole 26 (see FIG. 4) into which the male portion 13 is inserted in the mounting direction. The female portion 22 is fitted with the male portion 13 received in the fitting hole 26. The fitting hole 26 penetrates the attachment part 23 (female part 22) in the plate | board thickness direction. The fitting hole 26 is a round hole corresponding to the shape of the male part 13, and has an inner diameter slightly larger than the outer diameter of the cylindrical male part 13. The female part 22 (attachment part 23) has a dimension (plate thickness) smaller than the length of the male part 13 in the attachment direction, and when the male part 13 is inserted into the fitting hole 26, the male part 13 The vicinity of the tip portion protrudes from the female portion 22.

  The female portion 22 is configured to maintain the fitting with the male portion 13 against the force even when the retaining member 4 receives a force from the shaft member 124 toward the withdrawal side. . That is, the female part 22 has a part located on the insertion side with respect to the male part 13 inserted in the fitting hole 26, and this part hits the surface of the male part 13 facing the insertion side. This counteracts the force that the retaining member 4 receives on the withdrawal side, prevents displacement of the retaining member 4 toward the withdrawal side, and prevents the female portion 22 from coming off the male portion 13.

  The retaining portion 25 (see FIG. 4) is a portion that abuts the connecting pin 121 and prevents the connecting pin 121 from moving toward the withdrawal side, in other words, the shaft member 124 from moving toward the withdrawal side.

  Specifically, the retaining portion 25 includes a first retaining portion 25a and a second retaining portion 25b. The first and second retaining portions 25 a and 25 b are coupled to the end portion of the attachment portion 23 opposite to the female portion 22 and extend perpendicular to the attachment portion 23. The first and second retaining portions 25a and 25b are connected in the vicinity of the end portion on the attachment portion 23 side, and extend from the vicinity of the end portion toward the tip on the opposite side. The first retaining portion 25a and the second retaining portion 25b are located on both sides of the opening 28 that can receive the rod 122 of the shaft member 124 along the mounting direction. The first retaining portion 25a and the second retaining portion 25b are configured to be symmetrical to each other with respect to the center line therebetween, and have the same length.

  The first and second retaining portions 25a and 25b are in a state in which the retaining member 4 is disposed at the retaining position as shown in FIGS. 2 and 6, that is, in a state where the retaining member 4 is attached to the fixed portion 2 and the shaft member 124. The connecting pin 121 is disposed on the protruding side of the flange 132. In this state, the rod 122 of the shaft member 124 enters the opening 28, and the first and second retaining portions 25 a and 25 b abut against the withdrawing side surface 132 a of the flange portion 132, so that the shaft member 124 is removed. The movement to the side can be prevented.

  In the present embodiment, in the state where the shaft member 124 has advanced to the insertion side until the flange portion 132 of the connecting pin 121 contacts the fixing portion 2, the extraction side surface 132a and the retaining portions 25a, 25b There is a slight gap between them. When the shaft member 124 is slightly displaced toward the withdrawal side so that the gap is eliminated, the retaining portions 25a and 25b come into contact with the withdrawal side surface 132a. Further, in a state where the retaining member 4 is attached to the fixed portion 2 and the shaft member 124, the first and second retaining portions 25 a and 25 b are the male portion 13 and the female portion with respect to the shaft member 124 in the attachment direction. 22 (mounting portion 23) extends from the one side where it is disposed to the opposite side. Then, in this state, the first and second retaining portions 25a and 25b are arranged on the side opposite to the side where the male portion 13 and the mounting portion 23 are disposed with respect to the shaft member 124 (the lower end portion in the present embodiment). ).

  The opening 28 has a groove shape extending in the same direction as the penetrating direction of the fitting hole 26 of the female portion 22 from the tip (lower end) of the first and second retaining portions 25a, 25b to the mounting portion 23 side. The ends of the openings 28 on the distal end sides of the retaining portions 25a and 25b are open, and the rod 122 can be received in the openings 28 from the ends. The width of the opening 28 is slightly larger than the outer diameter of the rod 122, and the rod 122 enters the opening 28, and the first and second retaining portions 25 a and 25 b straddle the rod 122. The stop portions 25a and 25b have such a width that does not cause large rattling in the direction perpendicular to both the axial direction and the mounting direction with respect to the rod 122.

  The receiving portion 6 (see FIG. 2) is a horizontally long plate body standing on the base plate 140. That is, the receiving portion 6 is fixed to the turning frame 103 via the base plate 140. The receiving portion 6 is configured to prevent the first and second retaining portions 25a and 25b disposed on both sides of the rod 122 of the shaft member 124 from being displaced toward the withdrawal side. Both of the portions 25a and 25b are received from the exit side. Specifically, the receiving portion 6 receives the tip ends (lower end portions in the present embodiment) of both the first and second retaining portions 25a and 25b from the withdrawal side. The receiving portion 6 is disposed on the opposite side of the male member 13 with respect to the shaft member 124 in the mounting direction, and is disposed at an interval from the fixed portion main body 12 to the withdrawal side. The missing portion 6 is fixed to the upper surface of the base plate 140 by welding or the like. When the first and second retaining portions 25a, 25b receive a force from the shaft member 124 toward the retaining side, the retaining portion 6 presses the first and second retaining portions 25a, 25b and The displacement and deformation to the exit side are suppressed.

  The separation preventing portion 8 prevents the male portion 13 inserted into the fitting hole 26 of the female portion 22 of the retaining member 4 from separating from the fitting hole 26. The separation prevention unit 8 includes a retaining pin 30, a separation prevention unit base 32, and a retaining ring 34.

  The separation preventing portion base 32 is a plate-like block body, and a retaining pin 30 and a retaining ring 34 are attached to the separation preventing portion base 32. The retaining pin 30 has a straight rod shape, and a base end portion which is one end thereof is fixed to the separation preventing portion base portion 32, and extends so that the retaining pin 30 protrudes from the separation preventing portion base portion 32. The retaining ring 34 is attached to the separation preventing portion base 32 so as to be rotatable about an axis extending in a direction perpendicular to the extending direction of the retaining pin 30 (a direction perpendicular to the paper surface of FIG. 2).

  A portion that protrudes from the female portion 22 when the male portion 13 is inserted into the fitting hole 26 is provided with an unillustrated pin hole that penetrates the portion in the radial direction of the male portion 13. The retaining pin 30 is inserted from the distal end portion opposite to the base end portion. The retaining pin 30 can be inserted into and removed from this pin hole.

  When the male part 13 is inserted into the fitting hole 26, the male part 13 is inserted in a state where the retaining pin 30 is not inserted into the pin hole, and after the male part 13 is inserted into the fitting hole 26, the male part 13 is inserted into the pin hole. The stop pin 30 is inserted. In this state, the distal end portion of the retaining pin 30 protrudes from the pin hole to one side in the radial direction of the male portion 13, and the proximal end portion of the retaining pin 30 and the separation preventing portion base portion 32 are connected to the distal end portion from the pin hole. Projects to the opposite side. The retaining pin 30 and the disengagement preventing portion base 32 prevent the female portion 22 from being displaced away from the fixing portion main body 12 along the mounting direction, and the disengagement of the male portion 13 from the fitting hole 26 is prevented. Be blocked.

  The retaining ring 34 prevents the retaining pin 30 from coming out of the pin hole. The retaining ring 34 is reversed to the opposite side with respect to the tip of the retaining pin 30 when the retaining pin 30 is inserted into the pin hole, and the retaining pin 30 is inserted into the pin hole. Thereafter, the shaft is rotated to a position exceeding the tip of the retaining pin 30 as shown in FIG. In this state, the retaining ring 34 is prevented from coming off from the pin hole by being caught by the male part 13 when a force in a direction in which the retaining pin 30 is pulled out from the pin hole is applied to the separation preventing part 8. The pin 30 is prevented from being pulled out.

  Next, a procedure for attaching the winch 105 to the revolving frame 103 and a procedure for preventing the connection pin 121 from being detached by the retaining device 1 will be described.

  When the winch 105 is attached to the swivel frame 103, the lower end portion of the winch plate 113 is inserted from above between the pair of standing portions 110 of the mounting bracket 107 of the swivel frame 103, and then the rod 122 is attached to the drive device 126. The pin main body 131 of the connecting pin 121 is inserted into the pin hole 110 a of the standing portion 110 and the pin hole 113 a of the winch plate 113 by advancing outward in the width direction of 103. As a result, the winch plate 113 and the mounting bracket 107 are connected by the connecting pin 121, and the winch 105 is attached to the turning frame 103.

  In this state, in order to prevent the connecting pin 121 from unintentionally coming out of the pin holes 110a and 113a, the connecting pin 121 is prevented from coming off by the retaining device 1 of the present embodiment.

  Specifically, the retaining member 4 is moved closer to the fixed portion 2 and the shaft member 124 in the mounting direction. In the present embodiment, the retaining member 4 is lowered from above the fixed portion 2 and the shaft member 124 to approach the fixed portion 2 and the shaft member 124. Accordingly, the male portion 13 of the fixing portion 2 is inserted into the fitting hole 26 of the retaining member 4 along the mounting direction, and the female portion 22 of the retaining member 4 and the male portion 13 of the fixing portion 2 are connected. At the same time, the rod 122 of the shaft member 124 is inserted into the opening 28 of the retaining member 4 along the mounting direction. At this time, the front end portions (lower end portions) of the first and second retaining portions 25a and 25b are arranged on the insertion side with respect to the receiving portion 6 and contact the insertion side surface of the receiving portion 6. As described above, the retaining member 4 is attached to the fixed portion 2 and the shaft member 124.

  Thereafter, the retaining pin 30 is inserted into a pin hole (not shown) provided on the outer peripheral surface of the male portion 13, and the retaining ring 34 is hung on the retaining pin 30. Thereby, the male portion 13 is prevented from unintentionally detaching from the fitting hole 26 of the retaining member 4 in the mounting direction.

  As described above, the retaining member 4 is attached to the fixed portion 2 and the shaft member 124 as shown in FIGS. 6 and 7, and the retaining member 4 moves the shaft member 124 toward the withdrawal side. This prevents the connecting pin 121 from coming out of the pin holes 110a and 113a.

  In the retaining device 1 of the present embodiment, the male portion 13 included in the fixing portion 2 fixed to the swing frame 103 of the crane 100 extends along the mounting direction of the mounting portion 23 of the retaining member 4 with respect to the fixing portion 2. The female portion 22 of the mounting portion 23 of the retaining member 4 receives the male portion 13 along the mounting direction and engages with the male portion 13 to restrain the retaining member 4 at the retaining position, and The first and second retaining portions 25a and 25b of the retaining member 4 are located on both sides of the opening 28 that can receive the rod 122 of the shaft member 124 along the mounting direction. For this reason, the male part 13 and the female part 22 are fitted to each other and the attaching part 23 of the retaining member 4 is fixed to the fixing part 2 simply by making the retaining member 4 approach the fixing part 2 along the attaching direction. The rod 122 of the shaft member 124 is inserted into the opening 28 of the retaining member 4 so that the first and second retaining portions 25a and 25b come into contact with the withdrawal side surface 132a of the shaft member 124. The retaining member 4 can be arranged at the position, and the retaining member 4 can be restrained at that position. For this reason, even if the space adjacent to the mounting bracket 107 is narrow on the withdrawal side of the connecting pin 121, it is not necessary to perform the mounting work of the retaining member 4 such as bolting in such a narrow space, and the fixing portion 2 The attachment work of the retaining member 4 can be easily performed.

  Moreover, in the retaining device 1 of the present embodiment, the attachment portion 23 of the retaining member 4 is attached to the fixed portion 2 by fitting the male portion 13 and the female portion 22, and the first retaining member 4 is attached to the retaining portion 4. Since the second retaining portions 25a and 25b are disposed so as to sandwich the rod 122 of the shaft member 124 from both sides, for example, an external force in the rotation direction around the central axis of the male portion 13 is applied to the retaining member 4. Even in the case of the action, the first retaining portion 25a or the second retaining portion 25b can abut against the rod 122 to counteract the external force, and the retaining member 4 can be rotated from the shaft member 124. It can be prevented from coming off. Therefore, in the retaining device 1 of the present embodiment, the retaining member 4 can be stably installed.

  Further, in the retaining device 1 of the present embodiment, the first and second retaining portions 25a and 25b of the retaining member 4 are pressed by the receiving portion 6 from the withdrawal side, so that the first and second retaining portions are provided. Even when 25a, 25b receives a force from the shaft member 124 toward the withdrawal side, the first and second retaining portions 25a, 25b can be prevented from being displaced or deformed toward the withdrawal side. For this reason, it is possible to further improve the certainty of preventing the connecting pin 121 from being removed by the retaining member 4, and the force of the retaining member 4 from the shaft member 124 allows the retaining member 4 from the fixed portion 2 and the shaft member 124 to be removed. It is possible to prevent unintended detachment or damage to the retaining member 4 from occurring.

  Further, in the retaining device 1 of the present embodiment, the separation preventing portion 8 causes the female portion 22 of the retaining member 4 to be engaged with the male portion 13 inserted through the fitting hole 26, so that it can be removed from the fitting hole 26. The male part 13 can be prevented from unintentionally leaving. For this reason, stability of fixation of the retaining member 4 to the fixing portion 2 can be improved.

  In the retaining device 1 of the present embodiment, the fixing portion 2 is a guide portion that guides the shaft member 124 so that the shaft member 124 inserted through the guide hole 12a moves along the axial direction. Therefore, the position of the connecting pin 121 can be suppressed from being displaced when the connecting pin 121 is inserted into and removed from the pin holes 110a and 113a, and the fixing portion 2 and the guide portion for fixing the retaining member 4 can be used together. The score can be reduced.

  Further, in the retaining device 1 of the present embodiment, the male portion 13 of the fixing portion 2 and the fitting hole 26 of the retaining member 4 are both in the axial direction and the mounting direction as viewed from the axial direction. It arrange | positions in the range of the width | variety of the shaft member 124 in a perpendicular direction. For this reason, in the said perpendicular direction, it can suppress that the position of the male part 13 and the fitting hole 26 and the position of the 1st and 2nd retaining part 25a, 25b largely shift | deviate. For this reason, when a force directed from the shaft member 124 toward the withdrawal side along the axial direction is applied to the first and second retaining portions 25a, 25b, the rotational direction about the male portion 13 is increased. The force component can be prevented from acting on the first and second retaining portions 25a and 25b, and the first and second retaining portions 25a and 25b can be prevented from being deformed.

  Moreover, in the crane 100 of this embodiment, since the shaft member 124 is moved forward and backward by the driving device 126 and the connection pin 121 can be inserted into and removed from the pin holes 110a and 113a, the connection pin 121 is inserted into and removed from the pin holes 110a and 113a. The labor required for work can be reduced.

  Further, in the crane 100, an operation of assembling the fixed portion 2, the receiving portion 6, and the driving device 126 to the revolving frame 103 is performed in a narrow space adjacent to the mounting bracket 107 on the exit side of the connecting pin 121 while adjusting the positions thereof. It is difficult. However, in the crane 100 of the present embodiment, the fixed portion 2 and the driving device 126 are installed on the base 128, and the base 128 is attached to the revolving frame 103, so that the base 128 is mounted on the base 128 in a wide place away from the space. After the fixing portion 2, the receiving portion 6 and the driving device 126 are installed while adjusting their positions, the base 128, the fixing portion 2, the receiving portion 6 and the driving device 126 are integrated into the space. By attaching the base 128 to the revolving frame 103, the fixed portion 2, the receiving portion 6 and the driving device 126 can be assembled to the revolving frame 103, and it is not necessary to perform a difficult assembling work in the narrow space. Therefore, in the crane 100 of the present embodiment, the work of assembling the fixed portion 2, the receiving portion 6, and the drive device 126 to the revolving frame 103 can be facilitated.

  The retaining device and work machine according to the present invention are not necessarily limited to those having the above-described configuration. For example, the following configurations can be adopted in the retaining device and the work machine according to the present invention.

  The shape of the first and second retaining portions is not necessarily limited to the shape shown in the embodiment. For example, as shown in FIG. 8, one of the first and second retaining portions 25a, 25b is shorter than the other, and the inner edges of the retaining portions 25a, 25b are J-shaped. Also good. Also, as shown in FIG. 9, the first and second retaining portions 25a, 25b are shaped so that the distance between them gradually increases toward the tip side, and between them, The inner edge forming the opening may be V-shaped.

  Further, the receiving part may receive only one of the first and second retaining parts from the withdrawal side. In the modification of FIG. 8, the receiving part 6 having such a configuration is employed.

  In a configuration in which the receiving portion receives only one of the first and second retaining portions from the withdrawal side, the retaining device includes a sandwiching portion that sandwiches one retaining portion received by the receiving portion with the receiving portion. May be further provided. In the modification of FIG. 8, such a configuration is adopted.

  In the modified example, the sandwiching portion 42 is disposed with a gap through which the distal end portion of the first retaining portion 25a can be inserted from the receiving portion 6 to the insertion side of the connecting pin 121 (not shown in FIG. 8). 140 is fixed. When the retaining member 4 is attached to the fixed portion 2 and the shaft member 124 as in the above embodiment, the tip of the first retaining portion 25a is inserted into the gap between the clamping portion 42 and the receiving portion 6, The leading end is sandwiched between the clamping unit 42 and the receiving unit 6.

  When only one of the first and second retaining portions 25 a and 25 b is received by the receiving portion 6, the retaining portion centering on the male portion 13 in the direction in which the one retaining portion is separated from the receiving portion 6. Although it may be difficult to prevent the rotation of the member 4, the male portion 13 is centered by sandwiching the tip of the one retaining portion 25 a between the sandwiching portion 42 and the receiving portion 6 as in this configuration. The rotation of the retaining member 4 in both directions can be prevented.

  In addition, the shape of the male part may be a triangular prism, a quadrangular prism, or a prismatic prism having more corners. In this case, the shape of the fitting hole of the female part into which the prismatic male part is inserted may be a square hole shape that fits the prismatic male part. According to this configuration, the male part and the female part do not relatively rotate around the male part in a state where the male part is inserted into the fitting hole of the female part, and as a result, the male part is the center. The rotation of the retaining member can be effectively suppressed. Therefore, if such a configuration of the fitting hole of the male part and the female part is applied to the modified example of FIG. 8, even if the clamping part 42 is not provided, both directions of the retaining member 4 centering on the male part are provided. It is possible to prevent the rotation to the position.

  Further, the fixing portion to which the retaining member is attached is not necessarily a guide portion for guiding the shaft member. That is, if the member is arranged at a position on the pin withdrawal side with respect to the hole member provided with the pin hole and is fixed to the work machine, the retaining member is not required even if it does not have a function as a guide portion. It can be used as a fixed part for mounting.

  In this case, for example, the fixing portion may be provided at a position shifted from the shaft member in a direction orthogonal to both the axial direction of the pin and the mounting direction orthogonal to the axial direction. FIG. 10 shows a modification of such a configuration.

  In the modification of FIG. 10, the fixing portion 2 is disposed on the side of a shaft member (not shown) and provided on the base plate 140. The first and second retaining portions 25a and 25b of the retaining member 4 are arranged side by side with the fixing portion 2 in a state of being attached to the fixing portion 2 and disposed at the retaining position. The attachment portion 23 of the retaining member 4 extends along the direction in which the first and second retaining portions 25 a and 25 b and the fixing portion 2 are arranged, and the female portion 22 of the attachment portion 23 is the fixing portion 2. The male part 13 is fitted.

  In the modification of FIG. 10, the male part 13 has a quadrangular prism shape, and the fitting hole 26 of the female part 22 is a square hole that fits the shape of the male part 13. The shape of the fitting hole 26 of the male part 13 and the female part 22 can prevent the retaining member 4 from rotating around the male part 13 as described above.

  Further, the mounting direction of the mounting portion of the retaining member with respect to the fixed portion is not necessarily limited to the vertical direction, and may be a horizontal direction, a diagonal direction between the horizontal direction and the vertical direction, or the like. In this case, the extending direction of the male part of the fixing part and the extending direction of the opening of the retaining member that receives the shaft member may be set to the same direction as the mounting direction of the attaching part of the retaining member with respect to the fixing part. 11 and 12 show a modification of such a configuration.

  In the modification shown in FIGS. 11 and 12, the attachment direction of the retaining member 4 is a horizontal direction orthogonal to the central axis of the connecting pin 121 (shaft member 124). Therefore, the male portion 13 extends from the side surface of the fixed portion main body 12 along the attaching direction of the retaining member 4, and the opening 28 of the retaining member 4 extends along the attaching direction. Further, the first and second retaining portions 25 a and 25 b of the retaining member 4 are positioned above and below the opening 28. Further, in this modified example, the vertically long receiving portion 6 is erected on the base plate 140 at a position opposite to the male portion 13 with respect to the shaft member 124, and the receiving portion 6 makes the first and second lines arranged in the vertical direction. The two retaining portions 25 a and 25 b are received from the withdrawal side of the connecting pin 121.

  Moreover, in the said embodiment, although the male part is provided in the fixing | fixed part and the female part (fitting hole) fitted to the male part is provided in the retaining member, this male part and female part (fitting) The object to be provided with the hole) may be reversed. That is, the male part may be provided on the retaining member and the female part may be provided on the fixed part. In this case, the fitting hole of the female part provided in the fixing part is a hole recessed in the mounting direction from the outer surface of the female part (fixing part), and the male part provided in the retaining member is the mounting part. Any protrusion that protrudes in the direction may be used.

  Further, the extraction side surface of the shaft member with which the retaining portion of the present invention abuts is not necessarily limited to the end surface facing the withdrawal side of the flange portion of the pin. For example, a circumferential groove or step that is recessed in the radial direction is formed on the outer peripheral surface of the rod of the shaft member or the outer peripheral surface of the pin, and the surface of the inner surface of the peripheral groove that faces the exit side, or the step of the step The surface facing the withdrawal side may be the withdrawal side surface of the shaft member. Further, the pin does not necessarily have the above-described flange portion. In this case, for example, the extraction side surface where the end surface on the extraction side of the entire cylindrical pin abuts on the stopper portion It may be.

  Further, the shaft member does not necessarily have a rod connected to the pin, and may be a single pin.

  Further, the mounting direction of the mounting portion of the retaining member with respect to the fixed portion is not limited to the direction orthogonal to the central axis of the pin, and may be a direction that obliquely intersects with the central axis of the pin.

  Moreover, the work machine does not necessarily include a drive device that moves the shaft member forward and backward in order to insert and remove the pin into and from the pin hole.

  Further, the retaining device is not limited to the one that is applied to retaining the connecting pin that connects the winch plate to the swing frame of the crane as in the above embodiment. That is, the work machine to which the retaining device of the present invention is applied may be a work machine other than an excavator or another crane.

  In addition, the pin that the retaining device retains does not have to be a connecting pin that connects the winch plate and the swivel frame, but any pin that can be inserted into the pin hole of the hole member provided in the work machine. It may be a pin. For example, when the work machine is a crane, the retaining device may prevent the connecting pin that connects the lower spreader of the hoisting device for hoisting the hoisting member such as the boom to the revolving frame. .

  In the present invention, the structure of the work machine to which the base on which the fixing portion of the retaining device and the drive device for moving the shaft member forward and backward are attached is not necessarily limited to the revolving frame. In other words, any structure can be adopted as the structure in the present invention as long as it constitutes a predetermined part of the work machine, and the shaft member is used to insert and remove the pin from the pin hole of the hole member. A device that can be attached to the base at a position suitable for moving forward and backward may be appropriately selected.

DESCRIPTION OF SYMBOLS 1 Retaining device 2 Fixing part 4 Retaining member 6 Receiving part 8 Separation preventing part 12a Guide hole 13 Male part 22 Female part 25 Retaining part 25a First retaining part 25b Second retaining part 26 Fitting hole 28 Opening 107 Mounting bracket (hole member)
110a Pin hole (first pin hole)
113 winch plate (hole member)
113a Pin hole (second pin hole)
121 Connecting pin (pin)
124 Shaft member 126 Drive device 132a Extracting side surface

Claims (8)

A shaft member including a hole member provided with a pin hole, and a pin having a central axis extending in a certain direction and inserted through the pin hole along the central axis. A retaining device that is provided in a work machine having a withdrawal side facing the withdrawal side, and prevents the pin from coming out of the pin hole,
A fixing portion that is disposed at a position on the withdrawal side with respect to the hole member and is fixed to the work machine;
A retaining member that is attached to the fixing portion and prevents the shaft member from moving to the withdrawal side in a state where the pin is inserted into the pin hole;
The retaining member can be attached to the fixing portion by approaching the fixing portion along an attaching direction intersecting the central axis, and the attaching portion is attached to the fixing portion. A retaining portion for preventing movement of the shaft member to the withdrawal side in a state where
One of the fixed part and the attachment part has a male part extending along the attachment direction,
The other of the fixed part and the attachment part is a female part capable of receiving the male part along the attachment direction, and the retaining member is fitted with the received male part. There is one that restrains the retaining position in the axial direction that is the direction in which the central axis extends,
The retaining position is a retaining device in which the retaining member is a position where the shaft member is prevented from moving toward the withdrawal side by abutting against the withdrawal side surface. The retaining portion includes a first retaining portion and a second retaining portion located on both sides of an opening capable of receiving the shaft member along the mounting direction,
The retaining position prevents the shaft member from moving to the withdrawal side when the shaft member enters the opening and the first and second retaining portions abut against the withdrawal side surface. The retaining device according to claim 1, which is a position.   3. A receiving portion fixed to the work machine, further comprising a receiving portion that receives the retaining portion from the withdrawal side so as to prevent the retaining portion from being displaced toward the withdrawal side. The retaining device according to 1. The male part and the female part are arranged on one side with respect to the shaft member in a direction along the attachment direction,
The retaining portion extends from the one side to the opposite side to the one side with respect to the shaft member, and has a tip on the opposite side,
The retaining device according to claim 3, wherein the receiving portion receives the tip portion of the retaining portion from the retaining side.   The male part is prevented from detaching from the female part by preventing the retaining member from displacing in the direction away from the fixing part along the mounting direction in a state where the male part is fitted to the female part. The retaining device according to any one of claims 1 to 4, further comprising a disengagement preventing portion for inhibiting.   The fixed portion is a guide portion having a guide hole through which the shaft member is inserted, and guides the shaft member so that the shaft member inserted through the guide hole moves along the axial direction. The retaining device according to any one of claims 1 to 5. A working machine,
A structure constituting a predetermined part of the work machine;
The retaining device according to any one of claims 1 to 6,
A driving device that supports the shaft member and moves the shaft member forward and backward along the central axis in order to insert and remove the pin into and from the pin hole;
A work machine comprising: a base on which the fixing portion of the retaining device and the driving device are installed and attached to the structure. A working machine,
The retaining device according to any one of claims 1 to 6,
A frame of the work machine;
A mounting bracket installed on the frame;
A winch mounted on the frame, comprising a winch drum and a winch plate that supports the winch drum so that the winch drum can rotate about its central axis;
A shaft member including a connection pin for connecting the frame and the winch,
The mounting bracket is provided with a first pin hole,
The winch plate is provided with a second pin hole,
The connecting pin is inserted through the first pin hole and the second pin hole to connect the mounting bracket and the winch plate;
The fixing portion is arranged at a position on the side where the connecting pin comes out from the first pin hole and the second pin hole with respect to the mounting bracket and the winch plate, and is fixed to the frame.
The retaining member is attached to the fixing portion, and prevents the shaft member from moving to the withdrawal side in a state where the connecting pin is inserted into the first pin hole and the second pin hole. Work machine.

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