JP4806049B2 - Two-member connecting device - Google Patents

Abstract

Left and right upper centering members (33) and lower centering members (34) are provided at positions respectively opposing left and right second brackets (14), (15) in an extension boom (5B). As engaging groove portions (33C) of the upper centering members (33) are engaged with left and right upper connecting pins (16), (17), the left and right upper connecting pins (16), (17) can be centered with respect to left and right upper second pin insertion holes (14A), (15A), and can be smoothly inserted into these left and right upper second pin insertion holes (14A), (15A). In addition, as abutting groove portions (34C) of the lower centering members (34) are abutted against left and right lower connecting pins (18), (19), the left and right lower connecting pins (18), (19) can be centered with respect to left and right lower second pin insertion holes (14B), (15B), and can be smoothly inserted into these left and right lower second pin insertion holes (14B), (15B).

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.

  Two adjacent booms of the multi-boom for dismantling work are mutually connected by inserting a connecting pin through a pin insertion hole provided in one boom and a pin insertion hole provided in the other boom. It becomes the structure connected.

  In this case, as a multi-boom according to the prior art, one of the two adjacent booms is provided with a positioning pin fixed at a position different from the connecting pin, and the other boom of the two booms is provided with one of the two booms. A configuration has been proposed in which a hook member is provided that engages with a positioning pin fixed to the boom.

  In this conventional multi-boom, when one boom and the other boom are connected using a connecting pin, a hook member provided on the other boom is engaged with a positioning pin of one boom, , One boom is rotated around the positioning pin. Thereby, the pin insertion hole of one boom and the pin insertion hole of the other boom can be aligned, and two adjacent booms can be connected by inserting the connecting pin into the pin insertion hole of each boom. It is the structure which connects (refer patent document 1).

Japanese Utility Model Laid-Open No. 4-134666

  However, in the above-described prior art, since the positioning pin fixed to one boom is arranged at a position different from the pin insertion hole, the hook member provided on the other boom is engaged with the positioning pin and held. There is a problem that it is difficult to accurately align the pin insertion hole of one boom and the pin insertion hole of the other boom when one boom is rotated around the positioning pin.

  For this reason, a great deal of time is required to insert the connecting pin into the pin insertion hole provided in one boom and the pin insertion hole provided in the other boom, and when connecting two adjacent booms. There is a problem that workability deteriorates.

  The present invention has been made in view of the above-described problems of the prior art. When two members are connected using a connection pin, the connection pin is smoothly inserted into the pin insertion holes provided in the two members, respectively. It is an object of the present invention to provide a two-member connecting device that can be used.

In order to solve the above-described problems, the present invention provides a first member of a working device used in a hydraulic excavator configured by connecting a plurality of booms or arms, and a second member attached to the tip of the first member. The left and right first brackets provided to face the front end of the first member in the left and right directions, and the left and right first brackets on each, after having provided apart from the lower, left facing the first pin insertion hole of the lower, and the first bracket provided at the base end portion of the second member connected to the first member, The right and left second brackets and the left and right second brackets are provided separately above and below, respectively, and can be overlapped as the same hole axis as the upper and lower first pin insertion holes. Second pin insertion hole, upper and lower first pin insertion holes, and upper The upper and lower connecting pins inserted into the lower second pin insertion holes and the left and right first brackets, respectively, and the upper and lower connecting pins are connected to the upper and lower first pin insertion holes. It is applied to a two-member connecting device provided with an upper and lower connecting pin inserting / removing mechanism that inserts and removes the upper and lower second pin insertion holes in a state of being inserted into the upper and lower pins.

The feature of the configuration invention of claim 1 is employed, wherein the second member sac Chi before Symbol position facing the second bracket, the first on the said consolidated pin pin insertion holes and the upper second An upper centering member that aligns the axis of the upper connecting pin with the hole axis of the upper second pin insertion hole when inserted into the pin insertion hole, and the lower connection pin as the lower first pin insertion hole and the lower first pin insertion hole. There is provided a lower centering member that aligns the axis of the lower connecting pin with the hole axis of the lower second pin insertion hole when inserted through the two pin insertion hole.

  According to a second aspect of the present invention, the upper centering member extends in parallel with the second bracket from the upper corner of the second member, and surrounds the upper second pin insertion hole and is curved in an arc shape. The lower centering member is formed by a plate having an engaging groove portion that engages with the upper connecting pin, and the lower centering member extends in parallel with the second bracket from a lower corner of the second member, and the lower second pin It is formed by a plate body that has an abutting groove portion that is curved in an arc shape along the insertion hole and abuts against the lower connecting pin.

  According to a third aspect of the present invention, the upper and lower connecting pins are inserted into the upper and lower first pin insertion holes and the upper and lower second pin insertion holes; The upper and lower centering members having an outer diameter smaller than the portion and the large diameter portion being inserted into the upper and lower first pin insertion holes and the upper and lower second pin insertion holes. And a small-diameter portion that forms a gap therebetween.

  According to a fourth aspect of the present invention, the upper and lower connecting pin insertion / removal mechanisms are configured such that the upper and lower connecting pins are disposed at positions spaced upward and downward from the upper and lower connecting pins, and above and below the left first bracket. A left lever rotatably connected to the upper and lower connecting pins inserted into the first pin insertion hole and the cylinder, and an upper and lower first pin insertion holes on the right first bracket. Connecting the left and right levers in a floating state with respect to the left and right first brackets, and a right lever rotatably connected to the upper and lower connecting pins and the cylinder, The upper and lower connecting pins are constituted by links serving as fulcrums for moving the upper and lower connecting pins in the left and right directions according to the expansion and contraction of the cylinder.

  According to the first aspect of the present invention, when the upper connection pin is inserted into the upper first pin insertion hole of the first bracket and the upper second pin insertion hole of the second bracket, the upper connection pin The axis can be made to coincide with the hole axis of the upper second pin insertion hole. Further, when the lower connection pin is inserted into the lower first pin insertion hole of the first bracket and the lower second pin insertion hole of the second bracket, the lower second pin insertion is performed by the lower centering member. It can coincide with the hole axis of the hole. As a result, the upper connection pin can be smoothly inserted into the upper first pin insertion hole and the upper second pin insertion hole, and the lower connection pin can be smoothly inserted into the lower first pin insertion hole and the lower second pin insertion hole. Therefore, it is possible to improve workability when connecting the first bracket and the second bracket using the upper and lower connecting pins.

  According to the invention of claim 2, by engaging the engaging groove portion of the upper centering member provided in the second member with the upper connecting pin inserted through the upper first pin insertion hole of the first bracket, The two members rotate around the upper connecting pin, and the contact groove portion of the lower centering member contacts the lower connecting pin inserted through the lower first pin insertion hole of the first bracket. In this way, the engaging groove portion of the upper centering member is engaged with the upper connecting pin, and the abutting groove portion of the lower centering member is brought into contact with the lower connecting pin, so that It is possible to match the hole axis of the 2-pin insertion hole and to match the axis of the lower connecting pin and the hole axis of the lower second pin insertion hole by the lower centering member.

  According to the invention of claim 3, the small diameter of the upper connecting pin in a state where the large diameter portion of the upper connecting pin is inserted into the upper first pin insertion hole of the first bracket and the upper second pin insertion hole of the second bracket. A gap is formed between the portion and the upper centering member. Accordingly, it is possible to suppress the load transmitted between the first and second brackets via the upper connecting pin from being transmitted to the upper centering member, and similarly, the first and second brackets via the lower connecting pin. It can suppress that the load transmitted in between is transmitted to a lower centering member. As a result, the upper centering member and the lower centering member can be formed using a thin plate or the like, and the weight can be reduced.

  According to the invention of claim 4, when the cylinder of the upper connecting pin inserting / removing mechanism is expanded and contracted, the left and right levers move to the left and right using the link as a fulcrum, and the upper connected to the left and right levers. By moving the connecting pin in the left and right directions, the upper connecting pin can be smoothly inserted into and removed from the upper second pin insertion hole provided in the left and right second brackets. In addition, when the cylinder of the lower connecting pin insertion / extraction mechanism is expanded and contracted, the left and right levers move to the left and right using the link as a fulcrum, and the lower connecting pins connected to these left and right levers move to the left and right The lower connecting pin can be smoothly inserted into and removed from the lower second pin insertion hole provided in the left and right second brackets. As described above, since the upper and lower connecting pins can be easily inserted and removed from the first and second brackets using the cylinder, the workability when the first bracket and the second bracket are connected to and detached from each other is improved. Can be increased. Further, it is not necessary to manually insert and remove the upper and lower connecting pins from the first and second brackets, and this insertion and removal operation can be performed quickly and safely.

1 is a front view showing a multi-boom hydraulic excavator to which a two-member coupling device according to an 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 a perspective view which shows a lower boom, the 1st bracket of left and right, an upper connection pin insertion / extraction mechanism, etc. It is a partially broken perspective view which expands and shows an upper connection pin and an upper connection pin insertion / extraction mechanism. FIG. 5 is a cross-sectional view of the left and right first brackets, the connecting pin, the connecting pin inserting / removing mechanism, and the like as seen from the direction of arrows V-V in FIG. It is sectional drawing similar to FIG. 5 which shows the state which the connection pin moved to the connection position. It is sectional drawing which looked at the connection pin, the connection pin insertion / extraction mechanism, etc. from the arrow VII-VII direction in FIG. It is a perspective view which shows a joint boom, the left and right 2nd bracket, an upper centering member, a lower centering member, etc. FIG. 6 is a cross-sectional view of the left and right second brackets, the upper centering member, and the lower centering member as seen from the direction of arrows IX-IX in FIG. 2. It is sectional drawing which looked at the 2nd bracket, the upper centering member, the lower centering member, etc. from the arrow XX direction in FIG. It is sectional drawing which looked at the state which penetrated the upper connection pin to the 1st, 2nd bracket from the position similar to FIG. It is sectional drawing which looked at the state which penetrated the upper connection pin to the 1st, 2nd bracket from the arrow XII-XII direction in FIG. It is sectional drawing similar to FIG. 11 which shows the state which penetrated the upper connection pin and the lower connection pin to the 1st, 2nd bracket. It is sectional drawing which looked at the state which penetrated the upper connection pin and the lower connection pin to the 1st, 2nd bracket from the arrow XIV-XIV direction in FIG. It is sectional drawing similar to FIG. 14 which shows the modification of a connection pin insertion / extraction mechanism.

  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.

  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 provided on the front side of the body 3 so as to be able to move up and down, and is suitably used for dismantling a structure having a high ground height such as a high-rise building. It is.

  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.

  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. In the arranged state, the lower boom 5A and the joint boom 5B are connected using a two-member connecting device 11 described later.

  Next, 11 shows a two-member connecting device according to the present embodiment. The two-member connecting device 11 connects the lower boom 5A as the first member and the joint boom 5B as the second member. The two-member connecting device 11 includes left and right first brackets 12 and 13, left and right upper first pin insertion holes 12C and 13C, left and right lower first pin insertion holes 12D and 13D, which will be described later. Left and right second brackets 14 and 15, left and right upper second pin insertion holes 14 A and 15 A, left and right lower second pin insertion holes 14 B and 15 B, left and right upper connection pins 16 and 17, The left and right lower connecting pins 18 and 19, upper and lower connecting pin inserting / removing mechanisms 20 and 31, an upper centering member 33, a lower centering member 34, and the like.

  Reference numeral 12 denotes a left first bracket provided on the left end of the lower end of the lower boom 5A serving as a first member. The left first bracket 12 is arranged in the left and right directions at a constant interval as shown in FIGS. The left inner first bracket 12A and the left outer first bracket 12B that face each other. 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.

  The left inner first bracket 12A and the left outer first bracket 12B are fixed to the tip of the lower boom 5A having a rectangular tube shape by means of welding or the like, and from the upper corner 5A1 of the lower boom 5A. It extends upward and downward over the lower corner 5A2 (see FIG. 3). Further, a left second bracket 14 described later is arranged between the left inner first bracket 12A and the left outer first bracket 12B.

  Here, upper left first pin insertion holes 12C and 12C are formed at the upper end sides of the left inner first bracket 12A and the left outer first bracket 12B, respectively, and the left inner first bracket 12A and the left outer first bracket 12B are respectively formed. The lower left first pin insertion holes 12D, 12D are respectively drilled in the lower end side. The upper left first pin insertion hole 12C is inserted into a later-described upper left connection pin 16 so as to be removable, and the lower left first pin insertion hole 12D is inserted into an after-mentioned lower left connection pin 18 so as to be removable. It has become.

  Reference numeral 13 denotes a right first bracket provided on the right side of the tip of the lower boom 5A. The right first bracket 13 includes a right inner first bracket 13A facing in the left and right directions at regular intervals, and a right outer first bracket. It is comprised by the 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 fixed to the tip of the lower boom 5A using means such as welding. The lower boom 5A extends upward and downward from the upper corner 5A1 to the lower corner 5A2. A right second bracket 15 described later is arranged between the right inner first bracket 13A and the right outer first bracket 13B.

  Here, upper right first pin insertion holes 13C and 13C are formed on the upper ends of the right inner first bracket 13A and the right outer first bracket 13B, respectively, and the right inner first bracket 13A and the right outer first bracket 13B are formed. The lower right first pin insertion holes 13D, 13D are respectively drilled in the lower end side. Then, an upper right connection pin 17 described later is inserted into the upper right first pin insertion hole 13C so as to be removable, and a lower right connection pin 19 described later is inserted into the lower right first pin insertion hole 13D. It has a configuration.

  In this case, as shown in FIG. 5, the upper left first pin insertion hole 12 </ b> C formed in the left inner first bracket 12 </ b> A and the left outer first bracket 12 </ b> B of the left first bracket 12, and the right first bracket 13. The upper right first pin insertion hole 13C formed in the right inner first bracket 13A and the right outer first bracket 13B is disposed on the same hole axis O1-O1. Also, the lower left first pin insertion hole 12D 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 and the right The lower right first pin insertion hole 13D formed in the outer first bracket 13B is disposed on the same hole axis O2-O2.

  Reference numeral 14 denotes a left second bracket provided on the left side of the base end of the joint boom 5B serving as a second member. The left second bracket 14 is formed using a thick steel plate or the like. The left first bracket 14 is fixed to the base end portion of the joint boom 5B having a rectangular tube shape by means of welding or the like, and the upper left corner portion 5B2 is connected to the upper corner portion 5B2 of the joint boom 5B. , Extends downward.

  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, and the left inner first bracket 12A, the left outer first bracket 12B, They face in the left and right direction. Further, an upper left second pin insertion hole 14A is formed at a position corresponding to the upper left first pin insertion hole 12C of the left first bracket 12 on the upper end side of the left second bracket 14, and the lower end of the left second bracket 14 is provided. On the side, a lower left second pin insertion hole 14B is formed at a position corresponding to the lower left first pin insertion hole 12D of the left first bracket 12.

  15 is a right second bracket 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, and is welded to the base end portion of the joint boom 5B. In a state of being fixed using the means, the joint boom 5B extends upward and downward from the upper corner portion 5B1 to the lower corner portion 5B2.

  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, and the right inner first bracket 13A, the right outer first bracket 13B, They face in the left and right direction. Further, on the upper end side of the right second bracket 15, an upper right second pin insertion hole 15 </ b> A is formed at a position corresponding to the upper right first pin insertion hole 13 </ b> C of the right first bracket 13. On the side, a lower right second pin insertion hole 15B is formed at a position corresponding to the lower right first pin insertion hole 13D of the right first bracket 13.

  Here, as shown in FIG. 14, the upper left second pin insertion hole 14 </ b> A of the left second bracket 14 and the upper right second pin insertion hole 15 </ b> A of the right second bracket 15 are the upper left first of the left first bracket 12. The pin insertion hole 12 </ b> C and the right upper bracket 13 </ b> C can be overlapped as the same hole axis O <b> 1-O <b> 1 as the upper right first pin insertion hole 13 </ b> C. The lower left second pin insertion hole 14B of the left second bracket 14 and the lower right second pin insertion hole 15B of the right second bracket 15 are the lower left first pin insertion hole 12D of the left first bracket 12, the right second 1 bracket 13 can be overlapped as the same hole axis O2-O2 as the lower right first pin insertion hole 13D. Further, a left and right upper centering member 33 and a left and right lower centering member 34 described later are provided between the left and right second brackets 14 and 15.

  Reference numeral 16 denotes an upper left connection pin that is inserted into the upper left first pin insertion hole 12C of the left first bracket 12 and the upper left second pin insertion hole 14A of the left second bracket 14. The upper left connection pin 16 is shown in FIG. By moving between the disengagement position shown and the connection position shown in FIG. 6, the upper left second pin insertion hole 14A is inserted and removed. Here, as shown in FIG. 6, the upper left connecting pin 16 includes a large diameter portion 16A slidably inserted into the upper left first pin insertion hole 12C and the upper left second pin insertion hole 14A, and the large diameter portion. A small-diameter portion 16B having an outer diameter D2 (D1> D2) smaller than the outer diameter D1 of 16A is formed in a stepped columnar shape extending in the left and right directions. The small diameter portion 16B is formed with a notch portion 16C penetrating in the radial direction, and an upper end portion of a left lever 22 described later is inserted into the notch portion 16C.

  Reference numeral 17 denotes an upper right connection pin that is inserted into the upper right first pin insertion hole 13C of the right first bracket 13 and an upper right second pin insertion hole 15A of the right second bracket 15, and the upper right connection pin 17 is the upper right second pin. The pin is inserted into or removed from the pin insertion hole 15A. Here, as with the upper left connecting pin 16, the upper right connecting pin 17 also has a large diameter portion 17A slidably inserted into the upper right first pin insertion hole 13C and the upper right second pin insertion hole 15A, and the large diameter. A small diameter portion 17B having a smaller diameter than the portion 17A and a notch portion 17C are configured, and an upper end portion of a right lever 25 described later is inserted into the notch portion 17C.

  Reference numeral 18 denotes a lower left connection pin that is inserted into the lower left first pin insertion hole 12D of the left first bracket 12 and the lower left second pin insertion hole 14B of the left second bracket 14. The lower left connection pin 18 is shown in FIG. By moving between the disengagement position shown and the connection position shown in FIG. 6, the left lower second pin insertion hole 14B is inserted and removed. Here, as shown in FIG. 6, the lower left connecting pin 18 includes a large diameter portion 18A slidably inserted into the lower left first pin insertion hole 12D and the lower left second pin insertion hole 14B, and the large diameter portion. A small-diameter portion 18B having an outer diameter D2 (D1> D2) smaller than the outer diameter D1 of 18A is formed in a stepped column shape extending in the left and right directions. The small diameter portion 18B is formed with a notch portion 18C penetrating in the radial direction, and a lower end portion of a left lever 22 described later is inserted into the notch portion 18C.

  Reference numeral 19 denotes a lower right connection pin that is inserted into the lower right first pin insertion hole 13D of the right first bracket 13 and the lower right second pin insertion hole 15B of the right second bracket 15, and the lower right connection pin 19 is The lower right second pin insertion hole 15B is inserted / removed. Here, the lower right connecting pin 19, similarly to the lower left connecting pin 18, has a large diameter portion 19 </ b> A that is slidably inserted into the lower right first pin insertion hole 13 </ b> D and the lower right second pin insertion hole 15 </ b> B, A small diameter portion 19B having a smaller diameter than the large diameter portion 19A and a cutout portion 19C are configured, and a lower end portion of a right lever 25 described later is inserted into the cutout portion 19C.

  Next, reference numeral 20 denotes an upper connecting pin insertion / removal mechanism disposed between the left first bracket 12 and the right first bracket 13. The upper connection pin insertion / removal mechanism 20 inserts / removes the upper left connection pin 16 into / from the upper left second pin insertion hole 14A of the left second bracket 14 and also connects the upper right connection pin 17 to the upper right second of the right second bracket 15. The pin is inserted into or removed from the pin insertion hole 15A. 4 to 7, the upper connecting pin inserting / removing mechanism 20 includes a cylinder 21, a left lever 22, a right lever 25, a link 26 and the like which will be described later.

  Reference numeral 21 denotes a cylinder constituting the upper connecting pin inserting / removing mechanism 20, and this cylinder 21 is constituted by, for example, a hydraulic cylinder. It is comprised by the rod 21B which protruded. The cylinder 21 extends in the left and right directions at positions spaced from the left and right upper connecting pins 16 and 17 in the upward and downward directions (the length direction of the left and right first brackets 12 and 13). The rod 21B is expanded and contracted in the left and right directions by supplying and discharging pressure oil from a hydraulic pressure source (not shown).

  A left lever 22 is rotatably connected to the upper left connecting pin 16 and the cylinder 21. The left lever 22 is composed of a block body extending upward and downward as a whole. From the intermediate portion to the lower end portion, a notched portion 22A that is notched in a bifurcated manner with a constant interval is formed. The upper end portion of the left lever 22 is pin-coupled to the upper left connection pin 16 so as to be rotatable using the pin 23 while being inserted into the cutout portion 16C of the upper left connection pin 16. Further, the tip end side of the rod 21 </ b> B of the cylinder 21 is pivotally connected to the lower end portion of the notch portion 22 </ b> A of the left lever 22 using a pin 24. Further, a stopper 22B protruding toward the left first bracket 12 is provided on the upper end side of the left lever 22, and the stopper 22B is located on the left inner side when the upper left connecting pin 16 moves to the connecting position shown in FIG. The contact position of the upper left connecting pin 16 is set by contacting the first bracket 12A.

  A right lever 25 is rotatably connected to the upper right connecting pin 17 and the cylinder 21. The right lever 25 is composed of a block body extending upward and downward as a whole. From the intermediate portion to the lower end portion, a cutout portion 25A is formed that is cut into a bifurcated shape with a constant interval. The upper end of the right lever 25 is pivotally connected to the upper right connecting pin 17 using a pin 23 in a state of being inserted into the notch 17C of the upper right connecting pin 17. In addition, the bottom side of the tube 21 </ b> A of the cylinder 21 is pin-coupled to the lower end of the notch 25 </ b> A of the right lever 25 using a pin 24 so as to be rotatable. Further, a stopper 25B protruding toward the right first bracket 13 is provided on the upper end side of the right lever 25, and the stopper 25B is located on the right inner side when the upper right connecting pin 17 is moved to the connecting position shown in FIG. The contact position of the upper right connection pin 17 is set by contacting the first bracket 13A.

  A link 26 connects the left lever 22 and the right lever 25. The link 26 is not attached to any of the left and right first brackets 12 and 13, and the left and right first brackets are not attached. The brackets 12 and 13 are in a floating state. The link 26 is a fulcrum for moving the left and right upper connecting pins 16 and 17 connected to the upper ends of the left and right levers 22 and 25 in the left and right directions according to the expansion and contraction of the cylinder 21. It constitutes.

  Here, the link 26 is formed in a prismatic shape extending in the left and right directions, and the length dimension in the left and right directions of the link 26 is based on the distance between the left inner first bracket 12A and the right inner first bracket 13A. Is set slightly smaller. In addition, a U-shaped concave groove portion 26A is formed at both left and right ends of the link 26, and the concave groove portion 26A is slidably engaged with a rotation stop plate 29 described later. The link 26 is disposed between the left and right upper connecting pins 16 and 17 and the cylinder 19 while being inserted into the notches 22A and 25A of the left and right levers 22 and 25. One end of the link 26 is pivotally coupled to the left lever 22 using a pin 27, and the other end of the link 26 is pivotally coupled to the right lever 25 using a pin 28.

  Accordingly, when the cylinder 21 is reduced, the upper left connecting pin 16 is inserted into the upper left first pin insertion hole 12C of the left first bracket 12 and the upper left second pin insertion hole 14A of the left second bracket 14, The upper right connecting pin 17 is configured to be inserted into the upper right first pin insertion hole 13C of the right first bracket 13 and the upper right second pin insertion hole 15A of the right second bracket 15 (see FIG. 14). On the other hand, when the cylinder 21 is extended, the upper left connecting pin 16 is pulled out from the upper left first pin insertion hole 12C of the left outer first bracket 12B and the upper left second pin insertion hole 14A of the left second bracket 14, and the upper right The connecting pin 17 is configured to be extracted from the upper right first pin insertion hole 13 </ b> C of the right outer first bracket 13 </ b> B and the right second pin insertion hole 15 </ b> A of the right second bracket 15.

  Reference numeral 29 denotes left and right rotation stop plates provided on the left and right first bracket members 12 and 13, respectively. Each of the rotation stop plates 29 is formed of a rectangular plate extending in the upward and downward directions. The inner surface of the first bracket 12A and the inner surface of the right inner first bracket 13A are fixed to each other by means such as welding. And the recessed groove part 26A provided in the both ends of the link 26 is slidably engaged with the left and right rotation stop plates 29, respectively.

  Accordingly, when the left and right upper connecting pins 16 and 17 move between the connecting position and the disengaging position due to the expansion and contraction of the cylinder 21, the recessed groove portions 26 </ b> A formed at both ends of the link 26 are formed on the rotation stop plate 29. By being engaged, the upper connecting pin inserting / removing mechanism 20 can be prevented from rotating around the upper connecting pins 16 and 17.

  A flat upper stopper 30 is provided between the left and right first brackets 12 and 13 and is provided on the lower boom 5A. The upper stopper 30 is welded to the upper end of the lower boom 5A at the base end side. It is fixed by means, and the tip end side extends to a position where it faces the left and right upper connecting pins 16 and 17. As shown in FIG. 5, the upper stopper 30 is brought into contact with the small diameter portions 16B and 17B of the left and right upper connecting pins 16 and 17, so that the left and right upper connecting pins 16 and 17 are detached. Is set.

  In this case, when the small diameter portions 16B and 17B of the left and right upper connecting pins 16 and 17 are in contact with the upper stopper 30, respectively, the upper left connecting pin 16 is connected to the upper left first pin insertion hole of the left inner first bracket 12A. The upper right connecting pin 17 is inserted into only the upper right first pin insertion hole 13C of the right inner first bracket 13A and is inserted through only 12C. Therefore, the upper connecting pin inserting / removing mechanism 20 is configured to be held between the left inner first bracket 12A and the right inner first bracket 13A via the left and right upper connecting pins 16, 17.

  Next, reference numeral 31 denotes a lower connecting pin insertion / removal mechanism disposed between the left first bracket 12 and the right first bracket 13. The lower connection pin insertion / removal mechanism 31 inserts / removes the lower left connection pin 18 into the lower left second pin insertion hole 14B of the left second bracket 14 and also connects the lower right connection pin 19 to the lower right of the right second bracket 15. The second pin insertion hole 15B is inserted and removed.

  Here, similarly to the upper connection pin insertion / removal mechanism 20, the lower connection pin insertion / removal mechanism 31 includes a cylinder 21 disposed at a position spaced upward and downward from the left and right lower connection pins 18, 19 and a lower left connection. A left lever 22 is rotatably connected to the pin 18 using a pin 23 and is also connected to a cylinder 21 so as to be rotatable using a pin 24, and a right lower connection pin 19 is rotatable using a pin 23. Connected to the cylinder 21 and rotatably connected to the cylinder 21 using a pin 24, connected to the left lever 22 using a pin 27, and connected to the right lever 25 using a pin 28, This is generally constituted by a link 26 serving as a fulcrum for moving the left and right lower connecting pins 18 and 19 in the left and right directions according to the expansion and contraction of the cylinder 21.

  Reference numeral 32 denotes a flat plate-like lower stopper provided between the left and right first brackets 12 and 13 and provided on the lower boom 5A. The lower stopper 32 has a base end side welded to the lower end side of the lower boom 5A or the like. It is fixed using a means, and the tip end side extends to a position facing the left and right lower connecting pins 18 and 19. As shown in FIG. 5, the lower stopper 32 is brought into contact with the small diameter portions 18B and 19B of the left and right lower connecting pins 18 and 19, so that the left and right lower connecting pins 18 and 19 are disengaged. Is set.

  In this case, when the small diameter portions 18B and 19B of the left and right lower connecting pins 18 and 19 are in contact with the lower stopper 32, the lower left connecting pin 18 is inserted into the lower left first pin insertion hole of the left inner first bracket 12A. The lower right connecting pin 19 is inserted into only the lower right first pin insertion hole 13D of the right inner first bracket 13A and is kept inserted. Accordingly, the lower connecting pin insertion / removal mechanism 31 is configured to be held between the left inner first bracket 12A and the right inner first bracket 13A via the left and right lower connecting pins 18, 19.

  Next, reference numeral 33 denotes left and right upper centering members provided on the joint boom 5B. The upper centering member 33 includes upper first pin insertion holes 12C and 13C provided in the left and right first brackets 12 and 13 and upper second pins provided in the left and right second brackets 14 and 15, respectively. When the left and right upper connection pins 16 and 17 are inserted into the pin insertion holes 14A and 15A, the axis of the left and right upper connection pins 16 and 17 is connected to the left and right upper first pin insertion holes. 12C, 13C and the left and right upper second pin insertion holes 14A, 15A are made to coincide with the hole axis O1-O1.

  Here, when the left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B, the left upper centering member 33 is sandwiched between the left inner first bracket 12A and the left upper centering member 33. It is arranged at a position facing the second bracket 14. On the other hand, when the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B, the right upper centering member 33 sandwiches the right inner first bracket 13A. 2 is disposed at a position facing the bracket 15.

  As shown in FIGS. 8 to 10, the upper centering member 33 is formed in a substantially triangular shape as a whole by using a plate that is thinner than the left and right second brackets 14 and 15, and the joint boom 5B. The left and right upper second pin insertion holes 14 </ b> A and 15 </ b> A extend to positions corresponding to the left and right second brackets 14 and 15 from the upper corner 5 </ b> B <b> 1.

  Here, the upper centering member 33 includes a mounting portion 33A fixed to the upper corner 5B1 of the joint boom 5B by means of welding or the like, a protruding portion 33B protruding in a mountain shape from the mounting portion 33A, The projecting portion 33B is generally constituted by an engaging groove portion 33C that is formed by concavely denting the front end portion of the protrusion portion 33B and that surrounds the left and right upper second pin insertion holes 14A and 15A and is curved in an arc shape. In this case, the engaging groove 33C is formed in an arc shape having a radius of curvature substantially equal to the left and right upper second pin insertion holes 14A and 15A, and engages with the left and right upper connecting pins 16 and 17 from above. It is supposed to be. Further, the lower side of the engaging groove 33C is a tapered opening 33D opened larger than the hole diameter of the left and right upper second pin insertion holes 14A and 15A, and the left and right left and right along the opening 33D. The upper connecting pins 16 and 17 are configured to be guided to the engaging groove 33C.

  The left and right first brackets 12 and 13 have upper first pin insertion holes 12C and 13C, and the left and right second brackets 14 and 15 have upper second pin insertion holes 14A and 15A. When inserting the upper connecting pins 16 and 17, first, as shown in FIG. 11, the large diameter portions 16A of the left and right upper connecting pins 16 and 17 projecting from the left and right inner first brackets 12A and 13A, The engaging groove portions 33C of the left and right upper centering members 33 are respectively engaged with 17A from above. In this case, since the engaging groove 33C has a radius of curvature substantially equal to the left and right upper second pin insertion holes 14A and 15A, the engaging groove 33C of the left and right upper centering member 33 is By engaging the left and right upper connecting pins 16 and 17, the axes of the left and right upper connecting pins 16 and 17 are made to be the hole axis O1-O1 of the left and right upper second pin insertion holes 14A and 15A. (See FIG. 12).

  In this way, the left and right upper centering members 33 change the axes of the left and right upper connecting pins 16 and 17 to the hole axis O1-O1 of the left and right upper second pin insertion holes 14A and 15A. By matching, the upper first pin insertion holes 12C and 13C of the left and right first brackets 12 and 13 and the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15 are made. The upper connection pin insertion / removal mechanism 20 allows the left and right upper connection pins 16 and 17 to be smoothly inserted.

  Next, 34 indicates left and right lower centering members provided on the joint boom 5B. The lower centering member 34 includes lower first pin insertion holes 12D and 13D provided in the left and right first brackets 12 and 13, and lower second pins provided in the left and right second brackets 14 and 15, respectively. When the left and right lower connection pins 18 and 19 are inserted into the pin insertion holes 14B and 15B, the axis of the left and right lower connection pins 18 and 19 is set to the left and right lower first pin insertion holes. 12D, 13D and the left and right lower second pin insertion holes 14B, 15B are made to coincide with the hole axis O2-O2.

  Here, when the left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B, the left lower centering member 34 is sandwiched between the left inner first bracket 12A and the left lower centering member 34. It is arranged at a position facing the second bracket 14. On the other hand, when the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B, the lower centering member 34 on the right side is positioned on the right side with the right inner first bracket 13A interposed therebetween. 2 is disposed at a position facing the bracket 15.

  The lower centering member 34 is formed in a substantially triangular shape as a whole by using a plate that is thinner than the left and right second brackets 14 and 15, and the left and right corners 5 </ b> B <b> 2 are connected to the left and right corners 5 </ b> B <b> 2. While facing the second brackets 14 and 15 in parallel, it extends to positions corresponding to the left and right lower second pin insertion holes 14B and 15B.

  Here, the lower centering member 34 includes a mounting portion 34A fixed to the lower corner portion 5B2 of the joint boom 5B using a means such as welding, a protruding portion 34B protruding from the mounting portion 34A in a mountain shape, The projecting portion 34B is generally constituted by a contact groove portion 34C formed by recessing the tip end portion of the projecting portion 34B toward the joint boom 5B and being curved in an arc shape along the left and right lower second pin insertion holes 14B and 15B. In this case, the contact groove 34C is formed in an arc shape having a radius of curvature substantially equal to that of the left and right lower second pin insertion holes 14B and 15B, and forward and rearward to the left and right lower connection pins 18 and 19. Engage from (direction of arrow A in FIG. 11).

  The upper connecting pins are connected to the upper first pin insertion holes 12C and 13C of the left and right first brackets 12 and 13 and the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15, respectively. After inserting 16 and 17, the lower first pin insertion holes 12D and 13D of the left and right first brackets 12 and 13, and the lower second pin insertion holes 14B and 15B of the left and right second brackets 14 and 15, respectively. When the lower connecting pins 18 and 19 are inserted through the left and right upper connecting pins 16 and 17, respectively, the left and right second brackets 14 and 15 are moved forward and backward (in the direction of arrow A). Turn to.

  As a result, the large diameter portions 18A and 19A of the left and right lower connecting pins 18 and 19 projecting from the left and right inner first brackets 12A and 13A are brought into contact with the contact groove portions 34C of the left and right lower centering members 34. Are brought into contact with each other. In this case, since the contact groove 34C has a radius of curvature substantially equal to the left and right lower second pin insertion holes 14B and 15B, the contact groove 34C of the left and right lower centering member 34 is By contacting the left and right lower connecting pins 18 and 19, the axes of the left and right lower connecting pins 18 and 19 are aligned with the left and right lower second pin insertion holes 14B and 15B. Can match.

  In this way, the left and right lower centering members 34 change the axis of the left and right lower connecting pins 18 and 19 to the hole axis O2-O2 of the left and right lower second pin insertion holes 14B and 15B. By matching, the lower first pin insertion holes 12D and 13D of the left and right first brackets 12 and 13 and the lower second pin insertion holes 14B and 15B of the left and right second brackets 14 and 15 are provided. The left and right lower connecting pins 18 and 19 can be smoothly inserted by the lower connecting pin inserting / removing mechanism 31.

  The two-member connecting device 11 according to the present embodiment has the above-described configuration. Next, the two-member connecting device 11 is used to connect to the distal end side of the lower boom 5A constituting the boom 5 of the excavator 1. A case where the boom 5B is attached 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, the upper connecting pin insertion / removal mechanism 20 inserts the upper left connecting pin 16 into the upper left first pin insertion hole 12C of the left inner first bracket 12A with the cylinder 21 extended as shown in FIG. By inserting the upper right connecting pin 17 into the upper right first pin insertion hole 13C of the right inner first bracket 13A, it becomes a disengagement position and is held between the left inner first bracket 12A and the right inner first bracket 13A. Part of the large diameter portions 16A and 17A of the left and right upper connecting pins 16 and 17 protrude inward from the left and right inner first brackets 12A and 13A.

  On the other hand, the lower connecting pin insertion / removal mechanism 31 also inserts the lower left connecting pin 18 into the lower left first pin insertion hole 12D of the left inner first bracket 12A and extends the lower right connecting pin 19 to the right inner side with the cylinder 21 extended. By being inserted into the lower right first pin insertion hole 13D of the first bracket 13A, it becomes a disengagement position and is held between the left inner first bracket 12A and the right inner first bracket 13A, and the left and right lower connection Part of the large diameter portions 18A and 19A of the pins 18 and 19 protrudes inward from the left and right inner first brackets 12A and 13A.

  Then, the joint boom 5B lifted by the hydraulic crane 9 is moved downward toward the lower boom 5A, and as shown in FIG. 11, the engagement grooves 33C of the left and right upper centering members 33 are moved to the left and right. The large-diameter portions 16A and 17A of the left and right upper connecting pins 16 and 17 protruding from the inner first brackets 12A and 13A are engaged from above. Thereby, the axis line of the left and right upper connecting pins 16 and 17 can be made to coincide with the hole axis line O1-O1 of the left and right upper second pin insertion holes 14A and 15A.

  In this state, by reducing the cylinder 21 of the upper connecting pin inserting / removing mechanism 20, the left and right upper connecting pins 16 and 17 are placed on the left and right first brackets 12 and 13 as shown in FIG. The first pin insertion holes 12C and 13C and the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15 can be smoothly inserted.

  Next, by moving the joint boom 5B further downward, the left and right second brackets 14 and 15 are moved forward and rearward (in the direction of arrow A) with the left and right upper connecting pins 16 and 17 as the center. Rotate. As a result, as shown in FIG. 13, the left and right lower centering centers on the large diameter portions 18A and 19A of the left and right lower connecting pins 18 and 19 protruding from the left and right inner first brackets 12A and 13A. The contact groove 34C of the member 34 is brought into contact so that the axes of the left and right lower connection pins 18 and 19 coincide with the hole axis O2-O2 of the left and right lower second pin insertion holes 14B and 15B. it can.

  In this state, by reducing the cylinder 21 of the lower connecting pin insertion / removal mechanism 31, the left and right lower connecting pins 18 and 19 are moved below the left and right first brackets 12 and 13, as shown in FIG. The first pin insertion holes 12D and 13D and the lower second pin insertion holes 14B and 15B of the left and right second brackets 14 and 15 can be smoothly inserted.

  In this way, the left and right first brackets 12 and 13 provided on the lower boom 5A and the left and right second brackets 14 and 15 provided on the joint boom 5B are connected to the left and right upper connecting pins 16. , 17, and the left and right lower connecting pins 18 and 19 can be used to attach the joint boom 5B to the distal end side of the lower boom 5A.

  Here, as shown in FIGS. 13 and 14, the large diameter portions 16A and 17A of the left and right upper connecting pins 16 and 17 are connected to the upper first pin insertion holes 12C of the left and right first brackets 12 and 13, respectively. 13C and the left and right second brackets 14 and 15 are inserted into the upper second pin insertion holes 14A and 15A, and the engaging groove portion 33C of the left and right upper centering member 33 is connected to the upper connecting pin 16. , 17 face the small diameter portions 16B, 17B. As a result, the outer diameter D1 of the large diameter portion 16A and the outer diameter D2 of the small diameter portion 16B are formed between the engagement groove portion 33C of the left and right upper centering members 33 and the upper connection pins 16 and 17. A gap corresponding to the difference is formed.

  Similarly, the large diameter portions 18A and 19A of the left and right lower connecting pins 18 and 19 are connected to the lower first pin insertion holes 12D and 13D of the left and right first brackets 12 and 13, respectively. 2 In the state where the brackets 14 and 15 are inserted into the lower second pin insertion holes 14B and 15B, the contact groove portions 34C of the left and right lower centering members 34 are small diameter portions 18B and 19B of the lower connecting pins 18 and 19, respectively. Face to face. As a result, the outer diameter D1 of the large diameter portion 18A and the outer diameter D2 of the small diameter portion 18B are formed between the contact groove portion 34C of the left and right lower centering members 34 and the lower connecting pins 18 and 19. A gap corresponding to the difference is formed.

  Therefore, the load transmitted between the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 via the left and right upper connecting pins 16 and 17 is adjusted to the left and right upper centering positions. Transmission to the member 33 can be suppressed. Further, the load transmitted between the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 via the left and right lower connecting pins 18 and 19 is applied to the left and right lower centering members. 34 can be suppressed. As a result, the left and right upper centering members 33 and the lower centering member 34 can be formed using thin plate materials or the like, and the weight can be reduced.

Thus, according to this embodiment, the left of the extension boom 5B, the left across the right inner first bracket 12 A, 13 A, at a position facing the right second brackets 14 and 15, left and right The upper centering member 33 and the lower centering member 34 are provided. For this reason, by engaging the engaging groove 33C of the upper centering member 33 with the left and right upper connecting pins 16 and 17, the axes of the left and right upper connecting pins 16 and 17 are moved to the left and right first. 2 can be made to coincide with the hole axis O1-O1 of the upper second pin insertion holes 14A, 15A provided in the brackets 14, 15. Further, the abutment groove 34C of the lower centering member 34 is brought into contact with the left and right lower connection pins 18 and 19, so that the axes of the left and right lower connection pins 18 and 19 are moved to the left and right second axes. It can be made to correspond to the hole axial line O2-O2 of the lower second pin insertion holes 14B, 15B provided in the brackets 14, 15.

  As a result, the left and right upper connecting pins 16 and 17 can be smoothly inserted into the left and right upper first pin insertion holes 12C and 13C and the left and right upper second pin insertion holes 14A and 15A. The left and right lower connecting pins 18 and 19 can be smoothly inserted into the left and right lower first pin insertion holes 12D and 13D and the left and right lower second pin insertion holes 14B and 15B. Accordingly, the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15 are quickly used by using the left and right upper connection pins 16 and 17 and the left and right lower connection pins 18 and 19. The workability when connecting the joint boom 5B to the lower boom 5A can be improved.

  In the above-described embodiment, the upper and lower connecting pin inserting / removing mechanisms 20 and 31 are constituted by the cylinder 21 arranged to extend in the left and right directions, the left and right levers 22 and 25, and the link 26. The case where it comprises is illustrated. However, the present invention is not limited to this, and for example, a connecting pin insertion / extraction mechanism 41 as in the first modification shown in FIG. 15 may be used.

  That is, the connecting pin inserting / removing mechanism 41 includes a cylinder 42 that extends upward and downward, a first link 43 that is pin-connected to one end of the cylinder 42, an upper left connecting pin 16, and a first link 43. Between the left second link 44 that connects between the right upper link pin 17 and the first link 43, and between the other end side of the cylinder 42 and the left second link 44. You may comprise by the 3rd left link 46 to connect, and the 3rd right link 47 which connects between the other end side of the cylinder 42, and the right 2nd link 45. FIG.

  Further, a cylinder having two left and right rods is arranged coaxially with the left and right upper connecting pins 16 and 17, the left rod is connected to the upper left connecting pin 16, and the right rod is connected to the upper right connecting pin 17. It is good also as a structure connected to.

  In the above-described embodiment, the left first bracket 12 is constituted by two plates of the left inner first bracket 12A and the left outer first bracket 12B, and the right first bracket 13 is the right inner first bracket. The case where it comprises with two plates of 13A and the right outside 1st bracket 13B is illustrated. However, the present invention is not limited to this. For example, the left first bracket may be configured only by the left inner first bracket 12A, and the right first bracket may be configured only by the right inner first bracket 13A.

  In the above-described embodiment, the two-member connecting device 11 is connected to the lower boom 5A and the joint boom 5B among the lower boom 5A, the joint boom 5B, and the upper boom 5C constituting the boom 5 of the excavator 1. The case where it used for is illustrated. However, the present invention is not limited to this, and can be 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.

5A Lower boom (first member)
5B Joint boom (second member)
11 Two-member connecting device 12 Left first bracket 12C Upper left first pin insertion hole 12D Lower left first pin insertion hole 13 Right first bracket 13C Upper right first pin insertion hole 13D Lower right first pin insertion hole 14 Left second bracket 14A Upper left second pin insertion hole 14B Lower left second pin insertion hole 15 Right second bracket 15A Upper right second pin insertion hole 15B Lower right second pin insertion hole 16 Upper left connection pin 16A, 17A, 18A, 19A Large diameter portion 16B, 17B , 18B, 19B Small diameter portion 17 Upper right connecting pin 18 Lower left connecting pin 19 Lower right connecting pin 20 Upper connecting pin inserting / removing mechanism 21 Cylinder 22 Left lever 25 Right lever 26 Link 31 Lower connecting pin inserting / removing mechanism 33 Upper centering member 33C Engaging groove portion 34 Lower centering member 34C Contact groove 41 Connecting pin inserting / removing mechanism

Claims (4)

A first member (5A) of a working device (4) used in a hydraulic excavator configured by connecting a plurality of booms or arms, and a second member (5B) attached to the tip of the first member (5A) Used to connect between the two,
Left at the tip of the first member (5A), the left, which is provided to face in the right direction, the right first bracket (12, 13),
Upper and lower first pin insertion holes (12C, 12D, 13C, 13D) provided on the left and right first brackets (12, 13), respectively, spaced apart from each other above and below;
Left facing said first member provided at the base end portion of the second member connected to (5A) (5B) the first bracket (12, 13), and the right second bracket (14, 15) ,
The left and right second brackets (14, 15) are spaced apart from each other in the upper and lower directions and overlap with the upper and lower first pin insertion holes (12C, 12D, 13C, 13D) as the same hole axis. Upper and lower second pin insertion holes (14A, 14B, 15A, 15B),
Upper and lower connections inserted through the upper and lower first pin insertion holes (12C, 12D, 13C, 13D) and the upper and lower second pin insertion holes (14A, 14B, 15A, 15B), respectively. Pins (16, 17, 18, 19);
The upper and lower connecting pins (16, 17, 18, 19) disposed between the left and right first brackets (12, 13) are connected to the upper and lower first pin insertion holes (12C, 12D, 13C). 13D), and the upper and lower second pin insertion holes (14A, 14B, 15A, 15B) are inserted and removed, and the lower connecting pin insertion / removal mechanism (20, 31) is provided. In the two-member connecting device,
At the position facing the second bracket (14, 15) in the second member (5B), the upper connecting pin (16, 17) is connected to the upper first pin insertion hole (12C, 13C). An upper centering member (which aligns the axis of the upper connecting pin (16, 17) with the hole axis of the upper second pin insertion hole (14A, 15A) when inserted through the two pin insertion holes (14A, 15A) ( 33)
When the lower connection pin (18, 19) is inserted into the lower first pin insertion hole (12D, 13D) and the lower second pin insertion hole (14B, 15B), the lower connection pin (18, 19) A two-member coupling device characterized by comprising a lower centering member (34) whose axis is aligned with the hole axis of the lower second pin insertion hole (14B, 15B). The upper centering member (33) extends in parallel with the second bracket (14, 15) from the upper corner (5B1) of the second member (5B), and the upper second pin insertion hole (14A). , 15A) and is formed by a plate having an engagement groove (33C) that is curved in an arc shape and engages with the upper connection pin (16, 17),
The lower centering member (34) extends in parallel with the second bracket (14, 15) from the lower corner (5B2) of the second member (5B), and the lower second pin insertion hole (14B, The two-member connecting device according to claim 1, wherein the two-member connecting device is formed by a plate body having an abutting groove portion (34C) that is curved in an arc shape along 15B) and abuts against the lower connecting pin (18, 19).   The upper and lower connecting pins (16, 17, 18, 19) are connected to the upper and lower first pin insertion holes (12C, 12D, 13C, 13D) and the upper and lower second pin insertion holes (14A). , 14B, 15A, 15B) and a large-diameter portion (16A, 17A, 18A, 19A) that is inserted through the large-diameter portion (16A, 17A, 18A, 19A) and a large outer diameter. The upper and lower first pin insertion holes (12C, 12D, 13C, 13D) and the upper and lower second pin insertion holes (14A, 14B, 15A, 15B) are arranged with the diameter portions (16A, 17A, 18A, 19A). And a small-diameter portion (16B, 17B, 18B, 19B) that forms a gap between the upper and lower centering members (33, 34) in a state of being inserted into the upper and lower centering members. A two-member connecting device according to claim 1.   The upper and lower connecting pin insertion / removal mechanism (20, 31) includes a cylinder (21) disposed at a position spaced upward and downward from the upper and lower connecting pins (16, 17, 18, 19). The upper and lower connecting pins (16, 18) inserted into the upper and lower first pin insertion holes (12C, 12D) of the left first bracket (12) and the cylinder (21), respectively. The left lever (22) movably connected, and the upper and lower connecting pins (17, 17) inserted through the upper and lower first pin insertion holes (13C, 13D) of the right first bracket (13). 19) and a right lever (25) rotatably connected to the cylinder (21), and the left and right levers in a floating state with respect to the left and right first brackets (12, 13). (22, 25) are connected to accommodate the expansion and contraction of the cylinder (21). The two members according to claim 1, 2 or 3, wherein the upper and lower connecting pins (16, 17, 18, 19) are constituted by a link (26) as a fulcrum for moving left and right. Connecting device.

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