JP2010180692A - Two-member connecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly insert and withdraw a connecting pin into and from first and second members. <P>SOLUTION: A pin inserting/withdrawing mechanism 18 provided between right and left first brackets 13, 12 comprises: a hydraulic cylinder 19 arranged in a manner of being capable of extending and contracting in the same direction as that of the axis line of the right and left connecting pins 17, 16; a floating link 20 arranged in a floating state between the right and left first brackets 13, 12; a left link 21 connecting the left connecting pin 16 to the hydraulic cylinder 19 by the intermediary of the floating link 20; and a right link 24 connecting the right connecting pin 17 to the hydraulic cylinder 19 by the intermediary of the floating link 20. Consequently, right and left connecting pins 17, 16 connected to the right and left links 24, 21 move in right and left directions according to the extension and contraction of the hydraulic cylinder 19. As a result, the right and left connecting pins 17, 16 can be smoothly inserted into or withdrawn from the right and left brackets 13, 12 and right and left second brackets 15, 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a two-member connecting device suitably used for connecting two members such as a plurality of booms used in a hydraulic excavator, for example.

  In general, when dismantling a structure having a large height above the ground, such as a high-rise building, a hydraulic excavator provided with a work device for dismantling work is preferably used. This dismantling work apparatus usually has a plurality of booms called multi-booms, and an arm is attached to the tip side of the uppermost boom among the booms, and a crusher, a grapple, etc. This work tool can be attached.

  The multi-boom for dismantling work is configured to have a desired length by connecting a plurality of booms to each other, and the booms are connected using a two-member connecting device.

  This two-member connecting device according to the prior art is provided between the left and right brackets provided on one boom and the left and right brackets provided on the other boom of two booms connected to each other. They are connected by left and right connecting pins.

  In this case, one end of each of the left and right links is rotatably connected to the left and right connecting pins, and the other end of each of the left and right links is connected to a support member protruding from the bracket. It is pin-coupled so as to be rotatable using a fulcrum pin. Then, both ends of the hydraulic cylinder are connected to the middle portion of the left and right links in the longitudinal direction. When the hydraulic cylinder is expanded and contracted, one end of the link moves left and right around the fulcrum pin. By doing so, the connecting pin can be inserted into and removed from the bracket.

JP 2005-249185 A

  However, in the above-described conventional technology, support members are fixedly provided on the left and right brackets, and the other end sides of the left and right links are rotatably supported by the support members. For this reason, there exists a problem that the operation | work which fixes a supporting member to a bracket using means, such as welding, is complicated.

  Also, when the support member that supports the other end of the link is fixed to the bracket using means such as welding, the support member is accurately positioned with respect to the pin hole for the connecting pin provided in the bracket. Is difficult. As a result, there is a problem that it is difficult to smoothly insert and remove the connecting pin pin-connected to one end side of the link into the pin hole of the bracket according to the expansion and contraction of the hydraulic cylinder.

  Further, a long hole for horizontally moving the connecting pin when the link rotates about the fulcrum pin is formed on one end side of the link, and one end of the link is inserted through the pin inserted into the long hole. The side and the connecting pin are connected. Therefore, in order to form a long hole in the one end side of a link, complicated processes, such as an end mill process, are needed, and there exists a problem that the manufacturing cost of the whole 2 member coupling device containing a link will increase. Further, when a long hole is formed on one end side of the link, there is a problem that a pin inserted through the long hole is worn at an early stage because it is always in sliding contact with the inner peripheral edge of the long hole.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a two-member coupling device that can smoothly perform the insertion / removal operation of the coupling pins with respect to the first and second members. .

  In order to solve the above-described problems, the present invention is directed to left and right first members facing in the left and right directions, left and right first pin insertion holes respectively provided in the first members, and the left , Left and right second members facing the right first member, and left and right second pin insertions which can be overlapped as the same axis as the first pin insertion hole provided in each second member. A left connecting pin that is inserted into the hole, the left first pin insertion hole and the left second pin insertion hole, and a right connection pin that is inserted into the right first pin insertion hole and the right second pin insertion hole. The left connecting pin is disposed between the left and right first members, and the left connecting pin is inserted into and removed from the left first pin insertion hole and the left second pin insertion hole. A two-member linkage comprising a pin insertion / removal mechanism for inserting / removing the right connection pin into / from the right second pin insertion hole. It applied to the device.

  The invention according to claim 1 is characterized in that the pin inserting / removing mechanism includes a hydraulic cylinder disposed to be extendable and retractable from a position of an axis of the left and right connecting pins, and the left and right connecting pins. A floating link that is arranged in a floating state so that it can move at least in a direction perpendicular to the axis of the left and right connecting pins at a position spaced from the position of the axial line in the same direction as the hydraulic cylinder; and A left link that is rotatably connected between the left connecting pin and the hydraulic cylinder, and a right link that is rotatably connected between the right connecting pin and the hydraulic cylinder via the floating link. And the left and right first and second members are connected by the left and right connecting pins via the left and right links according to the expanded or contracted state of the hydraulic cylinder. It is linked, or disconnect lies in the a configuration.

  According to a second aspect of the present invention, the left link and the right link are attached to the left and right connecting pins, and the hydraulic cylinder and the floating link include the first and second members on the left side and the first and second members on the right side. Arranged between the second member and the second member so as to move at least in a direction perpendicular to the axis of the left and right connecting pins, and the pin insertion / removal mechanism is cantilevered by the left and right connecting pins It is in that.

  According to a third aspect of the present invention, the left connecting pin abuts between the left first member and the right first member at a position where the left connecting pin comes out of the left second pin insertion hole, and the right connecting pin is A stopper is provided to come into contact with the right second pin insertion hole.

  According to a fourth aspect of the present invention, the left and right first members are provided with a detent member for restricting the floating link from rotating about the left and right connecting pins. .

  According to a fifth aspect of the present invention, the hydraulic cylinder is disposed so as to be extendable and contractable in the same direction as the axis of the left and right connecting pins, and the left and right links are connected to the left and right connecting pins with respect to the hydraulic pressure. That is, the cylinder and the floating link are each constituted by one link.

  The invention according to claim 6 is that the floating link is disposed between the left and right connecting pins and the hydraulic cylinder.

  The invention according to claim 7 is that the floating link is disposed on the opposite side of the left and right connecting pins with the hydraulic cylinder interposed therebetween.

  According to the first aspect of the present invention, when the hydraulic cylinder is expanded and contracted, the left and right links rotate left and right with the floating link as a fulcrum, and the left and right links connected to the left and right links By moving the connecting pins in the left and right directions, the left and right connecting pins can be inserted into and removed from the first and second members. As described above, since the connecting and removing operation of the connecting pin with respect to the first and second members can be easily performed using the hydraulic cylinder, the workability when connecting or disconnecting the first member and the second member is improved. Can be increased. Further, since it is not necessary to manually perform the connecting / disconnecting operation of the connecting pin with respect to the first and second members, the connecting / disconnecting operation of the connecting pin can be performed quickly and safely.

  In this case, the floating link serving as a fulcrum when the left and right connecting pins rotate is in a floating state with respect to the left and right first members. For this reason, the link moves in accordance with the expansion operation or contraction operation of the hydraulic cylinder, so that the left connection pin connected to the left link is moved along the axis of the left first pin insertion hole and the left second pin insertion hole. It can be moved horizontally. Also, the right connection pin connected to the right link can be horizontally moved along the axis of the right first pin insertion hole and the right second pin insertion hole. As a result, the left connecting pin can be smoothly inserted and removed from the left first pin insertion hole and the left second pin insertion hole, and the right connection pin can be inserted into the right first pin insertion hole and the right second pin insertion hole. Can be inserted and removed smoothly.

  In addition, the floating link that is the fulcrum of the left and right links is floated with respect to the left and right first members, so that the fulcrum of the left and right links is fixed to the left and right first members, respectively. It is not necessary to provide it. As a result, the work of providing the fulcrum of each link on the first member can be eliminated, and the workability when the pin inserting / removing mechanism is attached between the left and right first members can be improved.

  Further, the floating link that connects the left and right links is in a floating state with respect to the left and right first members, so that the connection portion between the left link and the left connection pin, and the right link and the right connection pin It is not necessary to provide a long hole in the connecting portion for horizontally moving the left and right connecting pins. As a result, it is possible to reduce the manufacturing cost of the left and right links, and to prevent the pins and the like that pivotably connect between the links and the connecting pins from being worn, thereby extending the life of the left and right links. be able to.

  According to the invention of claim 2, the pin inserting / removing mechanism can be cantilevered using the left and right connecting pins. This eliminates the need for a member for attaching the pin insertion / removal mechanism between the first and second members on the left side and the first and second members on the right side, and improves workability when installing the pin insertion / removal mechanism. Can be increased.

  According to the invention of claim 3, the left connecting pin comes into contact with the stopper at a position where the left connecting pin comes out from the left second pin insertion hole, and the left connecting pin can be prevented from coming out from the left first pin insertion hole. On the other hand, the right connecting pin can also come into contact with the stopper at a position where the right connecting pin comes out of the right second pin insertion hole, and the right connecting pin can be prevented from coming out of the right first pin insertion hole. As a result, the left connecting pin is inserted into the left first pin insertion hole, and the pin connecting / disconnecting mechanism is held between the left and right first members while the right connecting pin is inserted into the right first pin insertion hole. I can leave.

  According to the invention of claim 4, the pin insertion / removal mechanism can be prevented from protruding outside the left and right first members and interfering with an obstacle or the like, thereby protecting the pin insertion / removal mechanism.

  According to the invention of claim 5, when the hydraulic cylinder is expanded and contracted in the same direction as the axis of the left and right connecting pins, the left and right links rotate left and right around the connecting portion with the floating link as a fulcrum. By doing so, the left and right connecting pins can be inserted into and removed from the left and right second pin insertion holes.

  According to the invention of claim 6, when the hydraulic cylinder is extended, the left and right connecting pins can be removed from the left and right second pin insertion holes, and when the hydraulic cylinder is reduced, The right connecting pin can be inserted into the left and right second pin insertion holes.

  According to the invention of claim 7, when the hydraulic cylinder is reduced, the left and right connecting pins can be removed from the left and right second pin insertion holes, and when the hydraulic cylinder is extended, The right connecting pin can be inserted into the left and right second pin insertion holes.

1 is a front view showing a multi-boom hydraulic excavator to which a two-member connecting device according to a first embodiment of the present invention is applied. It is a front view which shows the state which connects a joint boom to a lower boom. It is sectional drawing of the partially fractured view which looked at the 2 member coupling device by 1st Embodiment from the arrow III-III direction in FIG. It is sectional drawing which looked at the 2 member coupling device from the arrow IV-IV direction in FIG. FIG. 4 is a cross-sectional view similar to FIG. 3 showing a state in which the left and right connecting pins are removed from the left and right second brackets. FIG. 4 is a cross-sectional view similar to FIG. 3 showing a state in which the left connecting pin is in contact with the stopper. It is a partially broken perspective view which shows the pin insertion / extraction mechanism etc. by 1st Embodiment. It is sectional drawing similar to FIG. 3 which shows the 2 member coupling device by 2nd Embodiment. It is sectional drawing similar to FIG. 8 which shows the state which extracted the left and right connection pins from the left and right 2nd brackets. It is sectional drawing which looked at the floating link, the rotation stop member, etc. from the arrow XX direction in FIG. It is a partially broken perspective view which shows the pin insertion / extraction mechanism etc. by 2nd Embodiment. It is sectional drawing similar to FIG. 3 which shows the 2 member coupling device by 3rd Embodiment. It is sectional drawing similar to FIG. 12 which shows the state which extracted the left and right connection pins from the left and right 2nd brackets. It is sectional drawing which looked at the floating link, the rotation stop member, etc. from the arrow XIV-XIV direction in FIG. It is sectional drawing which shows the 2 member coupling device by 4th Embodiment. It is sectional drawing which looked at the 2 member coupling device from the arrow XVI-XVI direction in FIG. It is sectional drawing which shows the state which extracted the left and right connection pins from the left and right 2nd brackets. It is sectional drawing which shows the state which the left connection pin contact | abutted to the stopper. It is a partially broken perspective view which shows the pin insertion / extraction mechanism etc. by 4th Embodiment. It is sectional drawing which shows the 2 member coupling device by 5th Embodiment. It is sectional drawing which shows the state which extracted the left and right connection pins from the left and right 2nd brackets. It is sectional drawing which looked at the floating link, the 1st link, the 2nd link, the hydraulic cylinder, one pin, another pin, etc. from the arrow XXII-XXII direction in FIG. It is sectional drawing which shows the 2 member coupling device by 6th Embodiment. It is sectional drawing which shows the state which extracted the left and right connection pins from the left and right 2nd brackets. It is sectional drawing which shows the modification of the left and right 1st brackets.

  Hereinafter, an embodiment of a two-member connecting device according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where two booms constituting a multi-boom of a hydraulic excavator are connected.

  1 to 10 show a first embodiment of a two-member connecting device according to the present invention.

  In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and the upper swivel. A multi-boom working device 4 is provided on the front side of the body 3 so as to be able to move up and down. And this hydraulic excavator 1 is used suitably, for example for demolishing structures with high ground height, such as a high-rise building.

  Here, the working device 4 is pivoted to the front side of the upper boom 5C, which is composed of a lower boom 5A, a joint boom 5B, and an upper boom 5C that are rotatably attached to the front side of the upper swing body 3. A middle arm 6 that can be attached, an arm 7 including a lower arm 7A and an upper arm 7B that are rotatably attached to the distal end side of the middle arm 6, and a pivotal attachment that is attached to the distal end side of the upper arm 7B. And a crusher 8 as a working tool.

  Here, when the joint boom 5B is attached to the lower boom 5A of the boom 5, for example, as shown in FIG. 2, the joint boom 5B is lifted using a hydraulic crane 9 or the like, and the joint boom 5B is moved to the tip side of the lower boom 5A. The lower boom 5A and the joint boom 5B are connected using a two-member connecting device 11 described later.

  Next, the two-member connecting device 11 according to the first embodiment will be described in detail. That is, 11 indicates a two-member connecting device disposed between the lower boom 5A and the joint boom 5B. The two-member connecting device 11 connects the base end side of the joint boom 5B to the distal end side of the lower boom 5A. To do. As shown in FIGS. 3 to 7, the two-member connecting device 11 includes left and right first brackets 12 and 13, left and right first pin insertion holes 12 </ b> C and 13 </ b> C, and left and right first pin insertion holes 12 </ b> C and 13 </ b> C, respectively. 2 brackets 14 and 15, left and right second pin insertion holes 14 A and 15 A, a left connecting pin 16, a right connecting pin 17, a pin inserting / removing mechanism 18, and the like.

  Reference numeral 12 denotes a left first bracket as a left first member provided on the left side of the distal end portion of the lower boom 5A. The left first bracket 12 is a left inner first bracket 12A facing left and right at regular intervals. And the left outer first bracket 12B. Here, the left inner first bracket 12A and the left outer first bracket 12B are each formed using a thick steel plate or the like, and are fixed to the tip of the lower boom 5A using means such as welding.

  A left second bracket 14 to be described later is arranged between the left inner first bracket 12A and the left outer first bracket 12B. In addition, left first pin insertion holes 12C and 12C are formed at both ends of the left inner first bracket 12A and the left outer first bracket 12B in the length direction (upward and downward in FIGS. 3 and 4), respectively. The left first pin insertion hole 12 </ b> C is provided with a left connecting pin 16, which will be described later, inserted through the left first pin insertion hole 12 </ b> C.

  Reference numeral 13 denotes a right first bracket as a right first member provided on the right side of the distal end portion of the lower boom 5A. The right first bracket 13 is a right inner first bracket 13A that faces in the left and right directions at regular intervals. And the right outer first bracket 13B. Here, the right inner first bracket 13A and the right outer first bracket 13B are each formed using a thick steel plate or the like, and are fixed to the tip of the lower boom 5A using means such as welding.

  A right second bracket 15 described later is arranged between the right inner first bracket 13A and the right outer first bracket 13B. Also, right first pin insertion holes 13C and 13C are formed at both ends in the length direction (upward and downward directions in FIGS. 3 and 4) of the right inner first bracket 13A and the right outer first bracket 13B, respectively. The right first pin insertion hole 13 </ b> C is provided with a right connecting pin 17, which will be described later, inserted through the right first pin insertion hole 13 </ b> C.

  In this case, the left first pin insertion hole 12C formed in the left inner first bracket 12A and the left outer first bracket 12B of the left first bracket 12, the right inner first bracket 13A of the right first bracket 13, The right first pin insertion hole 13C formed in the right outer first bracket 13B is disposed on the same axis OO (see FIG. 5).

  Reference numeral 14 denotes a left second bracket as a left second member provided on the left side of the base end portion of the joint boom 5B. The left second bracket 14 is formed using a thick steel plate or the like. It is fixed to the end using means such as welding. The left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B of the left first bracket 12. Thereby, the left second bracket 14 faces the left inner first bracket 12A and the left outer first bracket 12B in the left and right directions. The left second bracket 14 is provided with a left second pin insertion hole 14A at a position corresponding to the left first pin insertion hole 12C of the left first bracket 12.

  Reference numeral 15 denotes a right second bracket as a right second member provided on the right side of the base end portion of the joint boom 5B. The right second bracket 15 is formed using a thick steel plate or the like. It is fixed to the end using means such as welding. The right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B of the right first bracket 13. Thus, the right second bracket 15 faces the right inner first bracket 13A and the right outer first bracket 13B in the left and right directions. The right second bracket 15 is provided with a right second pin insertion hole 15A at a position corresponding to the right first pin insertion hole 13C of the right first bracket 13.

  Here, as shown in FIG. 5, the left second pin insertion hole 14 </ b> A of the left second bracket 14 and the right second pin insertion hole 15 </ b> A of the right second bracket 15 are the first left of the left first bracket 12. The pin insertion hole 12 </ b> C and the right first pin insertion hole 13 </ b> C of the right first bracket 13 can be overlapped as the same axis OO.

  Reference numeral 16 denotes a left connecting pin that connects the left first bracket 12 and the left second bracket 14, and the left connecting pin 16 is formed in a columnar shape extending in the left and right directions. The first pin insertion hole 12 </ b> C and the left second pin insertion hole 14 </ b> A of the left second bracket 14 are removably inserted. Therefore, the axis of the left connecting pin 16 can be overlapped as the same axis OO as the left first pin insertion hole 12C of the left first bracket 12. Here, on the base end side of the left connecting pin 16, a flange portion 16A having a diameter larger than the diameter of the left first pin insertion hole 12C, and a link mounting portion 16B to which a left link 21 described later is rotatably attached, Is provided.

  Reference numeral 17 denotes a right connecting pin that connects the right first bracket 13 and the right second bracket 15, and the right connecting pin 17 is formed in a columnar shape extending in the left and right directions. The first pin insertion hole 13C and the right second pin insertion hole 15A of the right second bracket 15 are removably inserted. Accordingly, the axis of the right connecting pin 17 can be overlapped as the same axis OO as the right first pin insertion hole 13 </ b> C of the right first bracket 13. Here, on the base end side of the right connecting pin 17, a flange portion 17A having a diameter larger than the hole diameter of the right first pin insertion hole 13C, and a link attachment portion 17B to which a right link 24 described later is rotatably attached. Is provided.

  Next, the pin insertion / removal mechanism 18 for inserting / removing the two sets of left and right connection pins 16 and 17 arranged in the upward and downward directions will be described.

  That is, 18 indicates two sets of pin insertion / removal mechanisms arranged in the upper and lower directions between the left first bracket 12 and the right first bracket 13, and these pin insertion / removal mechanisms 18 are provided on the left side of the left first bracket 12. The left connecting pin 16 is inserted into and removed from the first pin insertion hole 12C and the left second pin insertion hole 14A of the left second bracket 14, and the right first pin insertion hole 13C and right second of the right first bracket 13 are inserted. The right connecting pin 17 is inserted into and removed from the right second pin insertion hole 15 </ b> A of the bracket 15. The pin inserting / removing mechanism 18 includes a hydraulic cylinder 19, a floating link 20, a left link 21, a right link 24, and the like, which will be described later.

  Reference numeral 19 denotes a hydraulic cylinder that constitutes the pin insertion / removal mechanism 18. The hydraulic cylinder 19 includes a tube 19A, a piston (not shown), and a rod 19B whose proximal end is fixed to the piston and whose distal end protrudes from the tube 19A. Has been. The hydraulic cylinder 19 is positioned away from the position of the axis OO of the left and right connecting pins 16, 17, that is, the position separated from the axis OO of the connecting pins 16, 17 upward and downward. In addition, the left and right connecting pins 16 and 17 are arranged so as to be expandable and contractible in the same direction as the axis OO.

  The hydraulic cylinder 19 expands and contracts the rod 19B by supplying and discharging pressure oil from a hydraulic source (not shown), and connects the left and right via left and right links 21 and 24, which will be described later. The pins 16 and 17 are moved left and right.

  Reference numeral 20 denotes a floating link disposed at a position spaced upward and downward from the position of the axis OO of each of the connecting pins 16 and 17 from the position of the left and right connecting pins 16 and 17. That is, the floating link 20 is disposed adjacent to and parallel to the hydraulic cylinder 19. Here, the floating link 20 is not attached to any of the left and right first brackets 12 and 13, and is floated with respect to the left and right first brackets 12 and 13. Extends to the right. The floating link 20 is a fulcrum for moving left and right connecting pins 16 and 17 connected to left and right links 21 and 24, which will be described later, in the left and right directions according to the expansion and contraction of the hydraulic cylinder 19. It constitutes.

  Here, the floating link 20 is formed in a prismatic shape extending in the left and right directions, and the length dimension L of the floating link 20 is slightly smaller than the distance between the left inner first bracket 12A and the right inner first bracket 13A. It is set small (see FIG. 3). The floating link 20 is disposed between the left and right connecting pins 16 and 17 and the hydraulic cylinder 19, and one side (left side) of the floating link 20 in the left and right directions is the length of the left link 21 described later. The other side (right side) of the left and right directions of the floating link 20 is rotatably connected to a middle position in the length direction of the right link 24 described later. ing.

  A left link 21 connects the left connecting pin 16 and the hydraulic cylinder 19 via the floating link 20, and the left link 21 is connected to the connecting pins 16, 13 along the left and right first brackets 12, 13. It is formed by two plates extending in a direction (upward and downward) perpendicular to 17 axis OO (see FIG. 7). A pin hole 21B is formed in one end side 21A of the left link 21, and the pin 22 is inserted into the pin hole 21B and the link attachment portion 16B of the left connecting pin 16 to thereby end the one end side 21A of the left link 21. Is rotatably connected to the left connecting pin 16. Further, the other end side 21 </ b> C of the left link 21 is rotatably connected to the tip end side of the rod 19 </ b> B constituting the hydraulic cylinder 19 using a pin 23.

  Reference numeral 24 denotes a right link that connects the right connecting pin 17 and the hydraulic cylinder 19 via the floating link 20. The right link 24 is also connected to the left and right first brackets 12 and 13 in the same manner as the left link 21. It is formed by two plates extending in the upward and downward directions. Then, a pin hole 24B is formed in one end side 24A of the right link 24, and the pin 25 is inserted into the pin hole 24B and the link attachment portion 17B of the right connecting pin 17 so that one end side 24A of the right link 24 is inserted. Is connected to the right connecting pin 17 in a rotatable manner. In addition, the other end side 24 </ b> C of the right link 24 is rotatably connected to the bottom side of the tube 19 </ b> A constituting the hydraulic cylinder 19 using a pin 26.

  Then, one side (left side) of the left and right directions of the floating link 20 is rotatably connected to an intermediate portion in the length direction of the left link 21 using a pin 27, and the left and right directions of the floating link 20 are connected. The other side (right side) is rotatably connected to an intermediate portion in the length direction of the right link 24 using a pin 28.

  In this state, slight gaps are formed between the left end portion of the floating link 20 and the left inner first bracket 12A, and between the right end portion of the floating link 20 and the right inner first bracket 13A. 20 is configured to be able to move between the left inner first bracket 12A and the right inner first bracket 13A in accordance with the expansion and contraction of the hydraulic cylinder 19. Two spacers 29 are arranged between the floating link 20 and the left link 21 and between the floating link 20 and the right link 24 with the floating link 20 interposed therebetween.

  Therefore, when the hydraulic cylinder 19 is expanded and contracted, one end side 21A of the left link 21 rotates left and right around the connecting portion (pin 27) with the floating link 20 as well as one end side 24A of the right link 24. However, it rotates in the left and right directions with the connecting portion (pin 28) to the floating link 20 as a fulcrum.

  Thus, when the hydraulic cylinder 19 is contracted, the left connecting pin 16 is inserted into the left first pin insertion hole 12C of the left first bracket 12 and the left second pin insertion of the left second bracket 14, as shown in FIG. It is inserted into the hole 14A. The right connecting pin 17 is inserted into the right first pin insertion hole 13 </ b> C of the right first bracket 13 and the right second pin insertion hole 15 </ b> A of the right second bracket 15. As a result, the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 can be connected.

  On the other hand, when the hydraulic cylinder 19 is extended, as shown in FIG. 5, the left connecting pin 16 is extracted from the left second pin insertion hole 14A of the left second bracket 14, and the right connecting pin 17 is connected to the right second pin. The bracket 15 is extracted from the right second pin insertion hole 15A. Accordingly, the left and right second brackets 14 and 15 can be separated from the left and right first brackets 12 and 13.

  Reference numeral 30 denotes a stopper provided between the left first bracket 12 and the right first bracket 13 in the vicinity of the left and right connecting pins 16 and 17, and the stopper 30 is, as shown in FIG. The left connecting pin 16 abuts at a position where the left connecting pin 16 comes out from the left second pin insertion hole 14A, and the right connecting pin 17 comes into contact at a position where the right connecting pin 17 comes out from the right second pin insertion hole 15A. Here, the stopper 30 protrudes from the plate-like base plate 30A spanned between the left inner first bracket 12A and the right inner first bracket 13A, and the left and right central portions of the base plate 30A. And a contact plate 30B on which the link attachment portion 16B of the left connection pin 16 and the link attachment portion 17B of the right connection pin 17 abut.

  When the hydraulic cylinder 19 extends and the left connecting pin 16 comes out of the left second pin insertion hole 14A, the link mounting portion 16B of the left connecting pin 16 comes into contact with the contact plate 30B of the stopper 30 so that the left The connecting pin 16 is configured to prevent the connecting pin 16 from being pulled out from the left first pin insertion hole 12C of the left inner first bracket 12A. When the hydraulic cylinder 19 extends and the right connecting pin 17 comes out of the right second pin insertion hole 15A, the link mounting portion 17B of the right connecting pin 17 comes into contact with the contact plate 30B of the stopper 30 to The connecting pin 17 is configured to prevent the connecting pin 17 from being pulled out from the right first pin insertion hole 13C of the right inner first bracket 13A.

  Here, as shown in FIG. 5, when the link mounting portions 16B and 17B of the left and right connecting pins 16 and 17 are in contact with the contact plate 30B of the stopper 30, the left connecting pin 16 is Only the left first pin insertion hole 12 </ b> C of the first bracket 12 </ b> A is inserted, and the right connection pin 17 is kept inserted only to the right first pin insertion hole 13 </ b> C of the right inner first bracket 13 </ b> A. Accordingly, the pin inserting / removing mechanism 18 is configured to be held between the left inner first bracket 12A and the right inner first bracket 13A via the left and right connecting pins 16 and 17.

  The two-member connecting device 11 according to the first embodiment has the above-described configuration. Next, by using the two-member connecting device 11, the front end side of the lower boom 5A constituting the boom 5 of the excavator 1 is used. The case where the joint boom 5B is attached to will be described.

  First, as shown in FIG. 2, the joint boom 5 </ b> B is lifted using the hydraulic crane 9, and the base end side of the joint boom 5 </ b> B is attached to the distal end side of the lower boom 5 </ b> A attached to the upper swing body 3 side of the excavator 1. To place.

  At this time, as shown in FIG. 5, the pin inserting / removing mechanism 18 inserts the left connecting pin 16 into the left first pin insertion hole 12C of the left inner first bracket 12A with the hydraulic cylinder 19 extended, The connecting pin 17 is inserted through the right first pin insertion hole 13C of the right inner first bracket 13A. Accordingly, the pin inserting / removing mechanism 18 is held between the left inner first bracket 12A and the right inner first bracket 13A via the left and right connecting pins 16 and 17.

  Then, as shown in FIG. 5, the left second bracket 14 provided on the joint boom 5B is inserted between the left inner first bracket 12A and the left outer first bracket 12B provided on the lower boom 5A. The right second bracket 15 provided on the joint boom 5B is inserted between the right inner first bracket 13A and the right outer first bracket 13B provided on the lower boom 5A. Furthermore, the left second pin insertion hole 14 </ b> A of the left second bracket 14 and the right second pin insertion hole 15 </ b> A of the right second bracket 15 are connected to the left first pin insertion hole 12 </ b> C and the right first bracket 13 of the left first bracket 12. The first right pin insertion hole 13C is overlapped on the same axis OO.

  In this state, as shown in FIG. 3, the hydraulic cylinder 19 is contracted by supplying and discharging pressure oil from a hydraulic source (not shown) to the hydraulic cylinder 19 of the pin insertion / removal mechanism 18. As a result, the left link 21 rotates counterclockwise with the connecting portion (pin 27) to the floating link 20 as a fulcrum, so that the left connecting pin 16 connected to one end side 21A of the left link 21 is moved to the left. The first bracket 12 can be inserted into the left first pin insertion hole 12 </ b> C and the left second pin insertion hole 14 </ b> A of the left second bracket 14. On the other hand, since the right link 24 rotates clockwise with the connection portion (pin 28) with the floating link 20 as a fulcrum, the right connection pin 17 connected to one end side 24A of the right link 24 is connected to the right first. The right first pin insertion hole 13 </ b> C of the bracket 13 and the right second pin insertion hole 15 </ b> A of the right second bracket 15 can be inserted.

  In this case, the one end 21 </ b> A of the left link 21 moves in an arc shape around the pin 27. However, the floating link 20 that is in a floating state with respect to the left and right first brackets 12 and 13 can move according to the contraction operation of the hydraulic cylinder 19. As a result, the left connecting pin 16 connected to the one end side 21A of the left link 21 using the pin 22 moves horizontally along the axis OO of the left first pin insertion hole 12C and the left second pin insertion hole 14A. can do. Similarly, one end side 24 </ b> A of the right link 24 moves in an arc shape around the pin 28. However, the floating link 20 in the floating state can move according to the contraction operation of the hydraulic cylinder 19. Accordingly, the right connection pin 17 connected to the one end side 24A of the right link 24 using the pin 25 moves horizontally along the axis OO of the right first pin insertion hole 13C and the right second pin insertion hole 15A. can do.

  The left connecting pin 16 is inserted into the left first pin insertion hole 12C and the left second pin insertion hole 14A, whereby the left first bracket 12 and the left second bracket 14 are connected by the left connection pin 16. Can be linked. Further, the right connecting pin 17 is inserted into the right first pin insertion hole 13C and the right second pin insertion hole 15A, so that the right first bracket 13 and the right second bracket 15 are connected by the right connection pin 17. Can be linked.

  As a result, the left and right first brackets 12 and 13 provided on the distal end side of the lower boom 5A and the left and right second brackets 14 and 15 provided on the proximal end side of the joint boom 5B are connected to the left and right sides. These connecting pins 16 and 17 can be connected, and the joint boom 5B can be attached to the tip end side of the lower boom 5A.

  Next, in order to remove the joint boom 5B from the distal end side of the lower boom 5A, the left and right first brackets 12 and 13 provided on the distal end side of the lower boom 5A and the left provided on the proximal end side of the joint boom 5B The case where the left and right connecting pins 16 and 17 are removed from the right second brackets 14 and 15 will be described.

  In this case, as shown in FIG. 2, the hydraulic cylinder 19 of the pin insertion / removal mechanism 18 is extended with the joint boom 5 </ b> B attached to the distal end side of the lower boom 5 </ b> A supported by the hydraulic crane 9.

  As a result, as shown in FIG. 5, the left link 21 rotates clockwise with the connection portion (pin 27) to the floating link 20 as a fulcrum, so the left link 21 connected to one end 21A of the left link 21 The connecting pin 16 can be extracted from the left second pin insertion hole 14 </ b> A of the left second bracket 14. On the other hand, the right link 24 rotates counterclockwise around the connecting portion (pin 28) with the floating link 20, so that the right connecting pin 17 connected to one end side 24A of the right link 24 is connected to the right link 2 can be extracted from the right second pin insertion hole 15 </ b> A of the bracket 15.

  In this case, for example, when the friction force generated between the right connection pin 17 and the right second pin insertion hole 15A is larger than the friction force generated between the left connection pin 16 and the left second pin insertion hole 14A. As shown in FIG. 6, the left connecting pin 16 comes out of the left second pin insertion hole 14 </ b> A before the right connecting pin 17. At this time, the link attachment portion 16B of the left connection pin 16 contacts the contact plate 30B of the stopper 30, thereby restricting the left connection pin 16 from moving further in the extraction direction. The distal end side can be inserted through the left first pin insertion hole 12C of the left inner first bracket 12A.

  In this way, when the link mounting portion 16B of the left connecting pin 16 contacts the contact plate 30B of the stopper 30, the force when the hydraulic cylinder 19 extends concentrates on the right link 24. It can be reliably extracted from the right second pin insertion hole 15A. Then, the link attachment portion 17B of the right connection pin 17 contacts the contact plate 30B of the stopper 30 so that the distal end side of the right connection pin 17 becomes the right first pin insertion hole 13C of the right inner first bracket 13A. It can be inserted.

  In this manner, as shown in FIG. 5, the left connecting pin 16 is extracted from the left second pin insertion hole 14 </ b> A of the left second bracket 14, and the right connecting pin 17 is inserted through the right second pin of the right second bracket 15. It can be extracted from the hole 15A. Thereby, the left and right second brackets 14 and 15 can be separated from the left and right first brackets 12 and 13, and the joint boom 5B can be detached from the lower boom 5A.

  Further, when the joint boom 5B is removed from the lower boom 5A, the hydraulic cylinder 19 is kept extended. That is, the left connecting pin 16 is inserted through the left first pin insertion hole 12C of the left inner first bracket 12A, and the right connecting pin 17 is inserted through the right first pin insertion hole 13C of the right inner first bracket 13A. As a result, the pin insertion / removal mechanism 18 is held in a state of being suspended between the left inner first bracket 12A and the right inner first bracket 13A via the left and right connecting pins 16, 17.

  Thus, according to the first embodiment, the pin inserting / removing mechanism 18 provided between the left and right first brackets 12 and 13 is separated from the left and right connecting pins 16 and 17 so that these left and right A hydraulic cylinder 19 arranged to be extendable and contractable in the same direction as the axis OO of the connecting pins 16 and 17, and a floating link 20 arranged in a floating state between the left and right first brackets 12 and 13. A left link 21 connecting the left connecting pin 16 and the hydraulic cylinder 19 via the floating link 20, and a right link 24 connecting the right connecting pin 17 and the hydraulic cylinder 19 via the floating link 20. It is constituted by.

  As a result, when pressure oil is supplied to and discharged from the hydraulic cylinder 19 and expanded and contracted, one end sides 21A and 24A of the left and right links 21 and 24 rotate about the floating link 20 as a fulcrum. The left and right connecting pins 16 and 17 connected to one end sides 21A and 24A of the. Thereby, the left and right connecting pins 16 and 17 can be inserted into and removed from the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15.

  In this case, the left and right connecting pins 16 and 17 can be easily inserted and removed using the hydraulic cylinder 19, so the left and right first brackets 12 and 13 and the left and right second brackets 14 are connected. , 15 can be connected to or disconnected from each other. In addition, since it is not necessary to manually insert and remove the left and right connecting pins 16 and 17, this insertion and removal operation can be performed quickly and safely.

  In addition, the floating link 20 serving as a fulcrum when the left and right connecting pins 16 and 17 move is in a floating state that can move with respect to the left and right first brackets 12 and 13. The link 20 can move freely according to the expansion operation or contraction operation of the hydraulic cylinder 19. As a result, the left link 21 and the left connecting pin 16 are simply rotated relative to each other about the pin 22, and the left connecting pin 16 is moved along the axis O− of the left first pin insertion hole 12 </ b> C and the left second pin insertion hole 14 </ b> A. It can be moved horizontally along O. Further, the right link 24 and the right connecting pin 17 are simply rotated relative to each other about the pin 25, so that the right connecting pin 17 can be connected to the right first pin inserting hole 13C and the right second pin inserting hole 15A along the axis OO. Can be moved horizontally along. As a result, the left and right connecting pins 16 and 17 can be smoothly inserted and removed from the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15.

  Further, by floating the floating link 20 with respect to the left and right first brackets 12 and 13, the entire pin inserting / removing mechanism 18 cantilevered using the left and right connecting pins 16 and 17. Can do. As a result, the fulcrum of the left and right links 21 and 24 need not be fixedly provided on the left and right first brackets 12 and 13. As a result, it is possible to eliminate the troublesome work of providing fulcrums of the left and right links 21 and 24 on the left and right first brackets 12 and 13 of the lower boom 5A which is a large structure. The workability when the pin inserting / removing mechanism 18 is attached between the right first brackets 12 and 13 can be improved.

  Further, by bringing the floating link 20 to the floating state with respect to the left and right first brackets 12 and 13, the left link 21 and the left connecting pin 16 only rotate relative to each other about the pin 22, and the left connecting Since the pin 16 can be inserted into the left first pin insertion hole 12C and the left second pin insertion hole 14A, the pin hole 21B provided on the one end side 21A of the left link 21 does not need to be a long hole. Also, the right link pin 17 can be inserted into the right first pin insertion hole 13 </ b> C and the right second pin insertion hole 15 </ b> A simply by the relative rotation of the right link 24 and the right connection pin 17 about the pin 25. Since it can do, it is not necessary to make the pin hole 24B provided in the one end side 24A of the right link 24 into a long hole.

  As a result, it is possible to extend the life of the left link 21 by suppressing wear of the pin hole 21B drilled in the left link 21 and the pin 22 inserted through the pin hole 21B, and to pin the right link 24. The wear of the hole 24B and the pin 25 inserted through the pin hole 24B can be suppressed and the life of the right link 24 can be extended. In addition, the manufacturing cost of the left and right links 21 and 24 can be reduced because it is not necessary to form long holes in the one end sides 21A and 24A of the left and right links 21 and 24 by end milling or the like.

  Next, FIGS. 8 to 11 show a second embodiment of the present invention. The feature of the second embodiment is that a detent member for restricting the floating link from rotating about the left and right connecting pins is provided. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 31 denotes a two-member connecting device according to the second embodiment. The two-member connecting device 31 is substantially the same as that according to the first embodiment described above, and the left and right first brackets 12 are provided. 13, left and right first pin insertion holes 12C and 13C, left and right second brackets 14 and 15, left and right second pin insertion holes 14A and 15A, left connecting pin 16, right connecting pin 17, Although constituted by a pin insertion / removal mechanism 32 and the like which will be described later, the configuration of the pin insertion / removal mechanism 32 is different from that according to the first embodiment.

  Reference numeral 32 denotes a pin insertion / removal mechanism disposed between the left first bracket 12 and the right first bracket 13, which is replaced with the pin insertion / removal mechanism 18 according to the first embodiment. It is used for the form of. The pin inserting / removing mechanism 32 includes the hydraulic cylinder 19, the left link 21, the right link 24, a floating link 33, which will be described later, a rotation stop member 34, and the like.

  Reference numeral 33 denotes a floating link disposed in a position spaced upward and downward from the left and right connecting pins 16 and 17, and the floating link 33 is in a floating state between the left and right first brackets 12 and 13. And extends to the left and right. The floating link 33 moves the left and right connecting pins 16 and 17 connected to one end sides 21A and 24A of the left and right links 21 and 24 in the left and right directions according to the expansion and contraction of the hydraulic cylinder 19. It constitutes a fulcrum for making it happen.

  Here, the floating link 33 is formed in a prismatic shape extending in the left and right directions, and the length dimension of the floating link 33 is slightly smaller than the distance between the left inner first bracket 12A and the right inner first bracket 13A. Is set. Then, one side of the left and right directions of the floating link 33 is connected to an intermediate portion in the length direction of the left link 21 using a pin 27, and the other side of the left and right directions is connected to the right link 24 using a pin 28. It is connected to the intermediate part in the length direction. Further, as shown in FIG. 10 and the like, the left and right ends of the floating link 33 are respectively formed with groove portions 33A and 33A that are notched in a bifurcated shape. The stopper member 34 is engaged.

  Reference numeral 34 denotes left and right detent members provided on the left and right first brackets 12 and 13, respectively. These detent members 34 are floats provided between the left and right first brackets 12 and 13. The link 33 is restricted from rotating around the left and right connecting pins 16 and 17.

  Here, the rotation stop member 34 is formed by a prismatic body extending upward and downward along the left and right first brackets 12 and 13. On this, the detent member 34 is a portion of the inner surface of the left inner first bracket 12A facing the left end of the floating link 33 and the right end of the floating link 33 of the inner surface of the right inner second bracket 13A. Are fixed to the part facing each other by means of welding or the like.

  As a result, as shown in FIG. 10, the left and right concave groove portions 33A provided at both ends of the floating link 33 engage with the left and right detent members 34, respectively, and the floating link 33 is detented. It can move freely along the member 34 in the upward and downward directions. That is, the floating link 33 can move between the left and right first brackets 12 and 13 in a direction (upward and downward in FIGS. 8 and 9) perpendicular to the axis of the connecting pins 16 and 17. Is arranged.

  Accordingly, when the hydraulic cylinder 19 of the pin insertion / removal mechanism 32 expands and contracts, the left and right links 21 and 24 rotate left and right around the floating link 33 as a fulcrum. The connected left and right connecting pins 16 and 17 move in the left and right directions. At this time, the floating link 33 is configured to move upward and downward between the left and right first brackets 12 and 13 in a state where the recessed groove portions 33A formed at both ends thereof are engaged with the rotation stop member 34. It has become.

  The two-member connecting device 31 according to the second embodiment has the above-described configuration, and the basic operation is not particularly different from the two-member connecting device 11 according to the first embodiment.

  However, in the two-member connecting device 31 according to the second embodiment, the left and right first brackets 12 and 13 are provided with the rotation stop members 34 and are provided at both ends of the floating link 33 constituting the pin insertion / removal mechanism 32. The concave groove portion 33 </ b> A is configured to engage with the rotation stop member 34. As a result, the floating link 33 can freely move in the upward and downward directions, but can be restricted from rotating in any direction around the left and right connecting pins 16 and 17.

  Next, FIGS. 12 to 14 show a third embodiment of the present invention. The feature of the third embodiment resides in that a floating link is arranged on the opposite side of the left and right connecting pins across the hydraulic cylinder. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numeral 41 denotes a two-member connecting device according to the third embodiment. The two-member connecting device 41 includes left and right first brackets 12 and 13, left and right first pin insertion holes 12 </ b> C and 13 </ b> C, and left and right in substantially the same manner as in the first embodiment described above. The second brackets 14 and 15, left and right second pin insertion holes 14 A and 15 A, the left connecting pin 16, the right connecting pin 17, a pin inserting / removing mechanism 42 described later, etc. The configuration is different from that according to the first embodiment.

  Reference numeral 42 denotes a pin insertion / removal mechanism disposed between the left first bracket 12 and the right first bracket 13, which is replaced with the pin insertion / removal mechanism 18 according to the first embodiment instead of the pin insertion / removal mechanism 18 according to the first embodiment. It is used for the form of. The pin insertion / removal mechanism 42 includes the hydraulic cylinder 19, a floating link 43, a left link 44, a right link 45, a rotation stop member 47, and the like which will be described later.

  Reference numeral 43 denotes a floating link disposed at a position spaced upward and downward from the left and right connecting pins 16 and 17, and the floating link 43 is in a floating state between the left and right first brackets 12 and 13. And extends to the left and right. The floating link 43 is a fulcrum for moving left and right connecting pins 16 and 17 connected to left and right links 44 and 45, which will be described later, in the left and right directions according to the expansion and contraction of the hydraulic cylinder 19. Is configured.

  Here, the floating link 43 is formed in a prismatic shape extending in the left and right directions, and the length dimension of the floating link 43 is slightly smaller than the distance between the left inner first bracket 12A and the right inner first bracket 13A. Is set. The floating link 43 is disposed on the opposite side of the left and right connecting pins 16 and 17 with the hydraulic cylinder 19 interposed therebetween.

  A left link 44 connects the left connecting pin 16 and the hydraulic cylinder 19 via the floating link 43. The left link 44 extends upward and downward along the left and right first brackets 12 and 13. It is formed by two extending plates. A pin hole 44B is formed in one end side 44A of the left link 44, and the pin 22 is inserted into the pin hole 44B and the link attaching portion 16B of the left connecting pin 16 to thereby end the one end side 44A of the left link 44. Is rotatably connected to the left connecting pin 16.

  Further, the other end side 44 </ b> C of the left link 44 is rotatably connected to one side (left side) of the left and right directions of the floating link 43 using a pin 27. Further, the intermediate portion in the length direction of the left link 44 is connected to the tip end side of the rod 19 </ b> B constituting the hydraulic cylinder 19 so as to be rotatable using a pin 23.

  A right link 45 connects the right connecting pin 17 and the hydraulic cylinder 19 via the floating link 43. The right link 45 also extends upward and downward along the left and right first brackets 12 and 13. It is formed by two extending plates. Then, a pin hole 45B is formed in one end side 45A of the right link 45, and the pin 25 is inserted into the pin hole 45B and the link mounting portion 17B of the right connecting pin 17 so that one end side 45A of the right link 45 is inserted. Is connected to the right connecting pin 17 in a rotatable manner.

  Further, the other end side 45 </ b> C of the right link 45 is rotatably connected to the other side (right side) of the floating link 43 in the left and right directions using a pin 28. Further, an intermediate portion in the length direction of the right link 45 is connected to the bottom side of the tube 19 </ b> A constituting the hydraulic cylinder 19 so as to be rotatable using a pin 25. Two spacers 46 are arranged between the floating link 43 and the left link 44 and between the floating link 43 and the right link 45 with the floating link 43 interposed therebetween.

  Accordingly, when the hydraulic cylinder 19 is extended, as shown in FIG. 12, the left connecting pin 16 is connected to the left first pin insertion hole 12C of the left first bracket 12 and the left second pin insertion hole of the left second bracket 14. 14A. The right connecting pin 17 is inserted through the right first pin insertion hole 13 </ b> C of the right first bracket 13 and the right second pin insertion hole 15 </ b> A of the right second bracket 15. Thereby, the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 can be connected.

  On the other hand, when the hydraulic cylinder 19 is reduced, as shown in FIG. 13, the left connecting pin 16 is removed from the left second pin insertion hole 14A of the left second bracket 14, and the right connecting pin 17 is connected to the right second pin. The bracket 15 is extracted from the right second pin insertion hole 15A. Accordingly, the left and right second brackets 14 and 15 can be separated from the left and right first brackets 12 and 13.

  Reference numeral 47 denotes left and right detent members provided on the left and right first brackets 12 and 13, respectively. These detent members 47 are pins provided between the left and right first brackets 12 and 13, respectively. The floating link 43 of the insertion / removal mechanism 42 is restricted from rotating around the left and right connecting pins 16 and 17.

  Here, as shown in FIG. 14, the rotation stop member 47 has a concave groove 47A having a U-shaped cross-sectional shape. The detent member 47 is fixed to the inner surface of the left inner first bracket 12A and the inner surface of the right inner first bracket 13A by means of welding or the like, respectively, and the left and right first brackets 12 are fixed. , 13 extend upward and downward. The left and right ends of the floating link 43 engage with the concave grooves 47A of the left and right locking members 47, respectively, and the floating link 43 moves upward and downward along the locking members 47. On the other hand, it can move freely.

  The two-member connecting device 41 according to the third embodiment has the above-described configuration, and the basic operation is not particularly different from the two-member connecting device 11 according to the first embodiment.

  However, in the two-member connecting device 41 according to the third embodiment, the floating link 43 is disposed on the opposite side of the left and right connecting pins 16 and 17 with the hydraulic cylinder 19 interposed therebetween. Therefore, by extending the hydraulic cylinder 19, as shown in FIG. 12, the left and right connecting pins 16 and 17 are connected to the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 respectively. And can be inserted. On the other hand, by reducing the hydraulic cylinder 19, the left and right connecting pins 16, 17 can be removed from the left and right second brackets 14, 15 as shown in FIG.

  In this way, when the hydraulic cylinder 19 in which a larger force acts on the left and right connecting pins 16 and 17 is extended, the left and right connecting pins 16 and 17 are connected to the left and right first brackets 12 and 13. Since the left and right second brackets 14 and 15 can be inserted, the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 are connected to the left and right connecting pins 16. , 17 can be securely connected.

  Further, in the two-member connecting device 41 according to the third embodiment, both ends of the floating link 43 constituting the pin insertion / removal mechanism 42 are recessed in the rotation stop member 47 provided on the left and right first brackets 12 and 13. By engaging with the groove 47A, the pin insertion / removal mechanism 42 can be reliably restricted from rotating in any direction around the left and right connection pins 16 and 17.

  Next, FIGS. 15 to 19 show a fourth embodiment of the present invention. The feature of the fourth embodiment resides in that the hydraulic cylinder is disposed so as to be extendable and contractible in a direction orthogonal to the axis of the left and right connecting pins. Note that in the fourth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numeral 51 denotes a two-member connecting device according to the fourth embodiment. The two-member connecting device 51 includes left and right first brackets 12 and 13, left and right first pin insertion holes 12 </ b> C and 13 </ b> C, and left and right in substantially the same manner as in the first embodiment described above. The second brackets 14 and 15, left and right second pin insertion holes 14 A and 15 A, the left connecting pin 16, the right connecting pin 17, a pin inserting / removing mechanism 52 described later, and the like. However, in the fourth embodiment, the configuration of the pin insertion / removal mechanism 52 is different from that according to the first embodiment.

  Reference numeral 52 denotes a pin insertion / removal mechanism disposed between the left first bracket 12 and the right first bracket 13. This pin insertion / removal mechanism 52 is used in the fourth embodiment in place of the pin insertion / removal mechanism 18 according to the first embodiment. The pin inserting / removing mechanism 52 includes a hydraulic cylinder 53, a floating link 54, left and right first links 56 and 62, left and right second links 59 and 65, which will be described later.

  Reference numeral 53 denotes a hydraulic cylinder, and the hydraulic cylinder 53 is disposed at a position spaced upward and downward from the position of the axis OO of the left and right connecting pins 16 and 17. The hydraulic cylinder 53 includes a tube 53A, a piston (not shown), and a rod 53B. When hydraulic oil is supplied and discharged from a hydraulic source (not shown), It expands and contracts in a direction orthogonal to the axis OO.

  Reference numeral 54 denotes a floating link disposed at a position spaced upward and downward from the positions of the left and right connecting pins 16 and 17, and the floating link 54 is attached to both the left and right first brackets 12 and 13. It is not attached and is floating with respect to the left and right first brackets 12 and 13.

  Here, the floating link 54 is formed by two triangular plates facing each other with a spacer (not shown) having a width larger than the outer diameter of the hydraulic cylinder 53 (tube 53A) interposed therebetween. Further, the length L in the left and right directions of the floating link 54 is set slightly smaller than the distance between the left inner first bracket 12A and the right inner first bracket 13A, and the left end portion and the left inner side of the floating link 54 are set. A slight gap is formed between the first bracket 12A and between the right end of the floating link 54 and the right inner first bracket 13A (see FIG. 15). Accordingly, the floating link 54 can move between the left inner first bracket 12A and the right inner first bracket 13A in accordance with the expansion and contraction of the hydraulic cylinder 53.

  A bottom side of a tube 53 </ b> A serving as one end of the hydraulic cylinder 53 is rotatably connected to an intermediate portion in the left and right directions of the floating link 54 via a pin 55. Further, the other ends 56B and 62B of left and right first links 56 and 62, which will be described later, are rotatably connected to both left and right ends of the floating link 54, respectively. The fulcrum of the left and right first links 56 and 62 is configured.

  Reference numeral 56 denotes a first left link that connects the left connecting pin 16 and the floating link 54, and the first left link 56 constitutes a left link according to the present invention together with a second left link 59 described later. . Here, the left first link 56 is formed by two plates extending upward and downward along the left and right first brackets 12 and 13 (see FIG. 19). Then, one end side 56 </ b> A in the length direction of the left first link 56 is connected to the link attachment portion 16 </ b> B of the left connecting pin 16 via a pin 57. The other end side 56 </ b> B in the length direction of the left first link 56 is connected to the floating link 54 via a pin 58.

  59 denotes a second left link that connects a portion 56C in the longitudinal direction of the first left link 56 and the tip of the rod 53B of the hydraulic cylinder 53. The second left link 59 reduces the expansion and contraction force of the hydraulic cylinder 53. This is transmitted to the left first link 56, and is formed by two plates extending in the left and right directions while facing each other at a constant interval (see FIG. 19).

  Here, one end side 59A in the length direction of the left second link 59 is connected to a middle portion 56C of the left first link 56 via a pin 60, and the other end side 59B in the length direction of the left second link 59. Is connected to the tip of a rod 53B, which is the other end of the hydraulic cylinder 53, via a pin 61.

  Reference numeral 62 denotes a first right link that connects the right connecting pin 17 and the floating link 54, and the right first link 62 constitutes a right link together with a right second link 65 described later. Here, the right first link 62 is formed by two plates extending in the length direction of the left and right first brackets 12 and 13. Then, one end side 62 </ b> A in the length direction of the right first link 62 is coupled to the link attachment portion 17 </ b> B of the right coupling pin 17 via a pin 63. The other end 62 </ b> B in the length direction of the first right link 62 is connected to the floating link 54 via a pin 64.

  Reference numeral 65 denotes a right second link that connects the midway part 62C in the length direction of the right first link 62 and the tip of the rod 53B of the hydraulic cylinder 53. The right second link 65 reduces the expansion and contraction force of the hydraulic cylinder 53. This is transmitted to the right first link 62, and is formed by two plates extending in the left and right directions facing each other at a constant interval, like the left second link 59.

  Here, one end side 65 </ b> A in the length direction of the right second link 65 is connected to a midway part 62 </ b> C of the right first link 62 via a pin 66, and the other end side 65 </ b> B in the length direction of the right second link 65. Is connected to the tip of a rod 53B, which is the other end of the hydraulic cylinder 53, via a pin 61.

  In the fourth embodiment, the three members of the other end side 59B of the left second link 59, the other end side 65B of the right second link 65, and the tip of the rod 53B of the hydraulic cylinder 53 are common 1 It is configured to be pivotally connected via a book pin 61.

  Therefore, when the hydraulic cylinder 53 is expanded and contracted, the expansion / contraction force of the hydraulic cylinder 53 is transmitted to the left first link 56 via the left second link 59 and also transmitted to the right first link 62 via the right second link 65. . For this reason, the left first link 56 rotates left and right around the connecting portion (pin 58) with the floating link 54, and the right first link 62 has a connecting portion (pin) with the floating link 54. 64) and turn left and right.

  Accordingly, when the hydraulic cylinder 53 is contracted, the left connecting pin 16 connected to one end side 56A of the left first link 56 is connected to the left first pin insertion hole of the left first bracket 12, as shown in FIG. 12C and the left second pin insertion hole 14A of the left second bracket 14 are inserted. The right connecting pin 17 connected to one end side 62A of the right first link 62 is connected to the right first pin insertion hole 13C of the right first bracket 13 and the right second pin insertion hole 15A of the right second bracket 15. It is inserted. As a result, the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 can be connected.

  On the other hand, when the hydraulic cylinder 53 is extended, as shown in FIG. 17, the left connecting pin 16 is removed from the left second pin insertion hole 14A of the left second bracket 14, and the right connecting pin 17 is connected to the right second pin. The bracket 15 is extracted from the right second pin insertion hole 15A. Accordingly, the left and right second brackets 14 and 15 can be separated from the left and right first brackets 12 and 13.

  When the hydraulic cylinder 53 extends and the left connecting pin 16 comes out of the left second pin insertion hole 14A, the link mounting portion 16B of the left connecting pin 16 contacts the contact plate 30B of the stopper 30. Thereby, the left connecting pin 16 maintains a state of being inserted only through the left first pin insertion hole 12C of the left inner first bracket 12A. Further, when the hydraulic cylinder 53 extends and the right connecting pin 17 comes out of the right second pin insertion hole 15A, the link mounting portion 17B of the right connecting pin 17 contacts the contact plate 30B of the stopper 30. Thereby, the right connection pin 17 keeps the state inserted through only the right first pin insertion hole 13C of the right inner first bracket 13A. Accordingly, the pin inserting / removing mechanism 52 is held between the left inner first bracket 12A and the right inner first bracket 13A while being cantilevered by the left and right connecting pins 16, 17. Yes.

  Reference numeral 67 denotes left and right locking members provided on the left and right first brackets 12 and 13, respectively. These locking members 67 are connected to the left and right connecting pins by the floating link 54 of the pin inserting / removing mechanism 52. The rotation about 16 and 17 is restricted.

  Here, the rotation stop member 67 is a prismatic body extending upward and downward along the left and right first brackets 12 and 13, and includes an inner surface of the left inner first bracket 12A and the right inner second bracket 13A. It is fixed to the inner surface using means such as welding. The two plates constituting the floating link 54 sandwich the left and right locking members 67, respectively, and the floating link 54 is engaged with the locking member 67 in a state where the floating link 54 is engaged with the locking member 67. It is configured to move up and down along.

  The two-member connecting device 51 according to the fourth embodiment has the above-described configuration, and the basic operation is not particularly different from the two-member connecting device 11 according to the first embodiment.

  However, in the two-member connecting device 51 according to the fourth embodiment, the hydraulic cylinder 53 of the pin inserting / removing mechanism 52 is moved in a direction perpendicular to the axis OO of the left and right connecting pins 16 and 17 (FIGS. 15 and 16). (Upward and downward directions) are arranged to be extendable. Thus, even when the distance between the left and right first brackets 12 and 13 is narrow, the pin inserting / removing mechanism 52 including the hydraulic cylinder 53 can be easily disposed between the left and right first brackets 12 and 13. it can.

  Further, the other end side 59B of the left second link 59, the other end side 65B of the right second link 65, and the tip of the rod 53B of the hydraulic cylinder 53 are coaxially connected through a common pin 61. By connecting to the pin, the number of parts of the pin insertion / removal mechanism 52 can be reduced.

  Next, FIGS. 20 to 22 show a fifth embodiment of the present invention. The feature of the fifth embodiment is that one of the left and right second links is connected to the other end of the hydraulic cylinder using one pin, and the other between the left and right second links It is that it connected using the pin. In the fifth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 71 denotes a two-member connecting device according to the fifth embodiment. The two-member connecting device 71 includes left and right first brackets 12 and 13 and left and right first pin insertion holes 12C and 13C. The left and right second brackets 14 and 15, the left and right second pin insertion holes 14 A and 15 A, the left connecting pin 16, the right connecting pin 17, a pin inserting / removing mechanism 72 described later, and the like.

  Reference numeral 72 denotes a pin insertion / removal mechanism according to the fifth embodiment. The pin insertion / removal mechanism 72 includes a hydraulic cylinder 73, a floating link 74, left and right first links 76 and 81, and left and right second links 79, which will be described later. , 84 and the like.

  Reference numeral 73 denotes a hydraulic cylinder. The hydraulic cylinder 73 is composed of a tube 73A, a piston (not shown), and a rod 73B. When the hydraulic oil is supplied and discharged from the hydraulic source, the left and right connecting pins 16 are connected. , 17 expands and contracts in a direction orthogonal to the axis of 17.

  Reference numeral 74 denotes a floating link disposed at a position spaced upward and downward from the positions of the left and right connecting pins 16 and 17. The floating link 74 floats with respect to the left and right first brackets 12 and 13. It is in a state. Here, as in the fourth embodiment, the floating link 74 is formed by two triangular plates facing each other with the hydraulic cylinder 73 interposed therebetween, and is located at the left and right intermediate portions of the floating link 74. The bottom side of the tube 73 </ b> A of the hydraulic cylinder 73 is connected via a pin 75.

  Reference numeral 76 denotes a left first link that connects the left connecting pin 16 and the floating link 74, and the left first link 76 constitutes a left link together with a left second link 79 described later. Here, one end side 76 </ b> A in the length direction of the first left link 76 is connected to the link attachment portion 16 </ b> B of the left connecting pin 16 via a pin 77. The other end 76 </ b> B in the length direction of the first left link 76 is connected to the floating link 74 via a pin 78.

  79 is a second left link that connects the left first link 76 and the rod 73B of the hydraulic cylinder 73, and one end side 79A in the length direction of the left second link 79 is an intermediate portion 76C of the left first link 76. Are connected to each other via a pin 80. Further, the other end side 79 </ b> B in the length direction of the left second link 79 is connected to the right second link 84 described later via another pin 87.

  Reference numeral 81 denotes a right first link that connects the right connecting pin 17 and the floating link 74, and the right first link 81 constitutes a right link together with a right second link 84 described later. Here, one end side 81 </ b> A in the length direction of the right first link 81 is coupled to the link attachment portion 17 </ b> B of the right coupling pin 17 via a pin 82. The other end side 81 </ b> B in the length direction of the first right link 81 is connected to the floating link 74 via a pin 83.

  A right second link 84 connects the right first link 81 and the rod 73 </ b> B of the hydraulic cylinder 73, and one end side 84 </ b> A in the length direction of the right second link 84 is an intermediate portion of the right first link 81. It is connected to 81C through a pin 85. The middle portion 84B in the length direction of the right second link 84 is connected to the tip of the rod 73B of the hydraulic cylinder 73 via a pin 86, and the other end side 84C in the length direction of the right second link 84 is The other end side 79B of the left second link 79 is connected via another pin 87.

  In other words, in the fifth embodiment, the rod 73B of the hydraulic cylinder 73 and the right second link 84 are connected via a single pin 86, and the left second link 79 and the right second link 84 are connected. The two members are connected via another pin 87 at a position different from the one pin 86. Thereby, as shown in FIG. 22, the length dimension S of each pin 86 and 87 can be shortened.

  Reference numerals 88 denote left and right detent members provided on the left and right first brackets 12 and 13, respectively. These detent members 88 are the inner surface of the left inner first bracket 12A and the right inner second bracket 13A. It is fixed to the inner surface of the. Each detent member 88 is configured to guide the floating link 74 so as to be movable upward and downward.

  The two-member connecting device 71 according to the fifth embodiment has the above-described configuration, and the basic operation is not particularly different from the two-member connecting device 11 according to the first embodiment.

  However, the pin insertion / removal mechanism 72 of the two-member connecting device 71 according to the fifth embodiment connects the two members of the rod 73B of the hydraulic cylinder 73 and the right second link 84 via one pin 86, and the left first Two members of the two links 79 and the right second link 84 are connected via another pin 87. For this reason, for example, compared to the case where the three members of the rod 73B tip of the hydraulic cylinder 73, the left second link 79, and the right second link 84 are overlapped and connected by one long pin, The length dimension S of the pins 86 and 87 can be shortened. As a result, the strength of the pins 86 and 87 can be increased, and the life of the pin insertion / removal mechanism 72 can be extended.

  Next, FIG. 23 and FIG. 24 show a sixth embodiment of the present invention. The feature of the sixth embodiment is that the left and right connecting pins are inserted into the left and right second pin insertion holes when the hydraulic cylinder is extended, contrary to the fourth and fifth embodiments described above. Then, when the hydraulic cylinder is reduced, the left and right connecting pins are extracted from the left and right second pin insertion holes. In the sixth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numeral 91 denotes a two-member connecting device according to the sixth embodiment. The two-member connecting device 91 includes left and right first brackets 12 and 13 and left and right first pin insertion holes 12C and 13C. The left and right second brackets 14 and 15, the left and right second pin insertion holes 14 A and 15 A, the left connection pin 16, the right connection pin 17, a pin insertion / removal mechanism 92 described later, and the like.

  Reference numeral 92 denotes a pin insertion / removal mechanism according to the sixth embodiment. The pin insertion / removal mechanism 92 includes a hydraulic cylinder 93, a floating link 94, left and right first links 96 and 102, and left and right second links 99 described later. , 105 and the like.

  Reference numeral 93 denotes a hydraulic cylinder. The hydraulic cylinder 93 includes a tube 93A, a piston (not shown), and a rod 93B. When the hydraulic oil is supplied and discharged from a hydraulic source, the left and right connecting pins 16 are connected. , 17 expands and contracts in a direction orthogonal to the axis of 17.

  Reference numeral 94 denotes a floating link disposed at a position spaced upward and downward from the positions of the left and right connecting pins 16 and 17. The floating link 94 has two triangular shapes facing each other across the hydraulic cylinder 93. It is formed of a plate and is in a floating state with respect to the left and right first brackets 12 and 13. The bottom side of the tube 93 </ b> A of the hydraulic cylinder 93 is connected to the left and right intermediate portions of the floating link 94 via a pin 95.

  Reference numeral 96 denotes a first left link that connects the left connecting pin 16 and the floating link 94. The first left link 96 constitutes a left link together with a second left link 99 described later. Here, one end side 96 </ b> A of the left first link 96 is coupled to the link attachment portion 16 </ b> B of the left coupling pin 16 via a pin 97. The other end 96 </ b> B of the left first link 96 is connected to the floating link 94 via a pin 98.

  A left second link 99 connects the left first link 96 and the rod 93B of the hydraulic cylinder 93. One end side 99A of the left second link 99 is connected to a pin 100 at an intermediate portion 96C of the left first link 96. The other end 99B is connected to the tip of the rod 93B of the hydraulic cylinder 93 via a pin 101.

  Reference numeral 102 denotes a first right link that connects the right connecting pin 17 and the floating link 94, and the right first link 102 constitutes a right link together with a right second link 105 described later. Here, one end side 102 </ b> A of the right first link 102 is coupled to the link attachment portion 17 </ b> B of the right coupling pin 17 via the pin 103. The other end side 102 </ b> B of the right first link 102 is connected to the floating link 94 via a pin 104.

  A right second link 105 connects the right first link 102 and the rod 93 </ b> B of the hydraulic cylinder 93. One end 105 </ b> A of the right second link 105 is connected to the intermediate portion 102 </ b> C of the right first link 102 with a pin 106. The other end side 105 </ b> B is connected to the tip of the rod 93 </ b> B of the hydraulic cylinder 93 via a pin 101.

  Therefore, when the hydraulic cylinder 93 is extended, as shown in FIG. 23, the left connecting pin 16 is connected to the left first pin insertion hole 12C of the left first bracket 12 and the left second pin insertion hole of the left second bracket 14. 14A. The right connecting pin 17 is inserted into the right first pin insertion hole 13 </ b> C of the right first bracket 13 and the right second pin insertion hole 15 </ b> A of the right second bracket 15.

  On the other hand, when the hydraulic cylinder 93 is reduced, as shown in FIG. 24, the left connecting pin 16 is extracted from the left second pin insertion hole 14A of the left second bracket 14, and the right connecting pin 17 is connected to the right second pin. The bracket 15 is configured to be extracted from the right second pin insertion hole 15A.

  Reference numeral 107 denotes left and right detent members provided on the left and right first brackets 12 and 13, respectively. Each of these detent members 107 has floating links 94 connected to the left and right connecting pins 16 and 17, respectively. The rotation is controlled as the center.

  The two-member connecting device 91 according to the sixth embodiment has the above-described configuration, and the basic operation is not particularly different from the two-member connecting device 11 according to the first embodiment.

  However, the pin insertion / removal mechanism 92 of the two-member connecting device 91 according to the sixth embodiment is different from the fourth and fifth embodiments described above in that the first left and right firsts when the hydraulic cylinder 93 is extended. The left and right connecting pins 16 and 17 are inserted into the first pin insertion holes 12C and 13C of the brackets 12 and 13 and the second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15, respectively. be able to.

  In the first embodiment described above, the left first bracket 12 is composed of two plates, a left inner first bracket 12A and a left outer first bracket 12B, and the right first bracket 13 is a right inner. The case where it comprises with two plate bodies of 13 A of 1st brackets and the right outside 1st bracket 13B is illustrated. However, the present invention is not limited to this, and a left first bracket 12 'and a right first bracket 13' constituted by a single plate may be used, for example, as in a modification shown in FIG. . The same applies to the second to sixth embodiments.

  The two-member connecting device 11 according to the first embodiment described above includes the lower boom 5A and the joint boom 5B among the lower boom 5A, the joint boom 5B, and the upper boom 5C that constitute the boom 5 of the excavator 1. The case where it uses for the connection part of is illustrated. However, the two-member connecting device 11 according to the present invention is not limited to this, and is used for, for example, a connecting portion between the joint boom 5B and the upper boom 5C, a connecting portion between the lower arm 7A and the upper arm 7B constituting the arm 7, and the like. May be. The same applies to the second to sixth embodiments.

  In the above-described embodiments, the left and right first brackets 12 and 13 are provided on the lower boom 5A constituting the boom 5 of the excavator 1, and the left and right second brackets 14 and 15 are provided on the joint boom 5B. The case where is provided is illustrated. However, the present invention is not limited to this. For example, the left and right first brackets 12 and 13 may be provided on the joint boom 5B, and the left and right second brackets 14 and 15 may be provided on the lower boom 5A.

  Furthermore, in the first, second, and third embodiments described above, the case where the hydraulic cylinder 19 that expands and contracts in the same direction as the axis OO of the left and right connecting pins 16 and 17 is illustrated as an example. In the fourth, fifth, and sixth embodiments, the case where the hydraulic cylinders 53, 73, and 93 that extend and contract in the direction orthogonal to the axis OO of the left and right connecting pins 16 and 17 are illustrated. ing. However, the present invention is not limited to this. For example, a hydraulic cylinder that extends and contracts in an oblique direction with respect to the axis OO of the left and right connecting pins 16 and 17 may be used.

11, 31, 41, 51, 71, 91 Two-member connecting device 12, 12 'Left first bracket (left first member)
12C Left first pin insertion hole 13, 13 'Right first bracket (right first member)
13C Right first pin insertion hole 14 Left second bracket (left second member)
14A Left second pin insertion hole 15 Right second bracket (right second member)
15A Right second pin insertion hole 16 Left connection pin 17 Right connection pin 18, 32, 42, 52, 72, 92 Pin insertion / removal mechanism 19, 53, 73, 93 Hydraulic cylinder 20, 33, 43, 54, 74, 94 Floating Link 21, 44 Left link 24, 45 Right link 30 Stopper 34, 47, 67, 88, 107 Stop member 56, 76, 96 Left first link (left link)
59, 79, 99 Second left link (left link)
62, 81, 102 Right first link (right link)
65, 84, 105 Right second link (right link)
86 One pin 87 Other pins

Claims (7)

Left and right first members facing in the left and right directions, left and right first pin insertion holes respectively provided in the first members, and left facing the left and right first members, A right second member, left and right second pin insertion holes that can be overlapped as the same axis as the first pin insertion holes provided on each second member, and the left first pin insertion hole, Between the left connecting pin inserted into the left second pin insertion hole, the right connecting pin inserted into the right first pin insertion hole and the right second pin insertion hole, and the left and right first members The left connecting pin is inserted into and removed from the left first pin insertion hole and the left second pin insertion hole, and the right first pin insertion hole and the right second pin insertion hole are In the two-member connecting device comprising a pin inserting / removing mechanism for inserting / removing the right connecting pin,
The pin insertion / removal mechanism is
A hydraulic cylinder disposed to be extendable and retractable at a position spaced from the position of the axis of the left and right connecting pins;
Floating arranged in a floating state so as to move at least in a direction perpendicular to the axis of the left and right connecting pins from the position of the axis of the left and right connecting pins in the same direction as the hydraulic cylinder. Link,
A left link rotatably connected between the left connecting pin and the hydraulic cylinder via the floating link;
A right link rotatably connected between the right connecting pin and the hydraulic cylinder via the floating link;
A configuration in which the left and right first and second members are connected or disconnected by the left and right connecting pins via the left and right links, respectively, according to the expanded or contracted state of the hydraulic cylinder; A two-member connecting device characterized by that.   The left link and the right link are attached to the left and right connecting pins, and the hydraulic cylinder and the floating link are disposed between the left first and second members and the right first and second members. 2. The device according to claim 1, wherein the pin insertion / removal mechanism is cantilevered by the left and right connection pins, and is arranged so as to be movable in a direction perpendicular to the axis of the left and right connection pins. 2 member connecting device. Between the left first member and the right first member, the left connecting pin comes into contact with the left second pin insertion hole, and the right connecting pin is in the right second pin insertion hole. The two-member coupling device according to claim 1 or 2 , wherein a stopper that abuts at a position where it has slipped out is provided. 4. The structure according to claim 1 , 2, or 3 , wherein the left and right first members are provided with a detent member for restricting the floating link from rotating about the left and right connecting pins. Two-member connecting device. The hydraulic cylinder is arranged to be extendable and contractible in the same direction as the axis of the left and right connecting pins,
The left and right links, according to the left, it constituted by one link connecting each the floating link to the hydraulic cylinder to the connecting pins of the right claim 1, 2, 3 or 4 Two-member connecting device. The two-member connecting device according to claim 1, 2, 3, 4, or 5, wherein the floating link is disposed between the left and right connecting pins and the hydraulic cylinder. The two-member coupling device according to claim 1, 2, 3, 4, or 5, wherein the floating link is disposed on the opposite side of the left and right coupling pins with the hydraulic cylinder interposed therebetween.

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