KR20100108258A - Device for joining two members - Google Patents

Abstract

PURPOSE: A device for connecting two members is provided to insert connection pins into pin insertion holes installed in two members. CONSTITUTION: A device for connecting two members comprises left and right first brackets, upper and lower first pin insertion holes, left and right second brackets, upper and lower second pin insertion holes, upper and lower connection pins, and upper and lower connection pin fixtures. The left and right first brackets are installed in a first member(5A). The upper and lower first pin insertion holes are installed in the left and right first brackets. The left and right second brackets are installed in a second member(5B) connected to the first member. The upper and lower second pin insertion holes are installed in the left and right second brackets.

Description

2-member connecting device {DEVICE FOR JOINING TWO MEMBERS}

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

In general, when dismantling a structure having a large ground height, such as a high-rise building, a hydraulic excavator provided with a work device for dismantling work is suitably used. The work device for dismantling work usually has a plurality of booleans called multi-boobs, and an arm is provided at the tip side of the uppermost boolean of each of the booleans, and a work tool such as a crusher and a grapple is installed at the tip side of the arm. Will be.

The two buoys adjacent to each other among the multi-boobs for dismantling work are connected to each other by inserting connecting pins into pin insertion holes provided in one buoy and pin insertion holes provided in the other buoy.

In this case, as a multi-boost according to the prior art, a positioning pin is fixed to one of two adjacent sub-boosts at a position different from the connecting pin, and one of the two sub-boosts It is proposed that the hook member which engages with the fixed positioning pin is provided.

In this multi-boost according to the prior art, when connecting one buoy and the other buoy using a connecting pin, by hooking the hook member provided on the other buoy with the positioning pin of one buoy and lifting one buoy, Rotate one boolean around the positioning pin. As a result, the pin insertion hole of one of the buoys and the pin insertion hole of the other buoy can be aligned, and the two pins adjacent to each other are connected by inserting a connecting pin into the pin insertion hole of each of the buoys. (Patent Document 1: Japanese Patent Application Laid-open No. Hei 4-134566).

However, in the above-mentioned prior art, the positioning pin fixed to one buoy is arrange | positioned in the position separated from the pin insertion hole. For this reason, when the one buoy is rotated around the positioning pin by lifting the hook member provided on the other buoy to the positioning pin, the pin insertion hole of one buoy and the pin of the other buoy are inserted. There is a problem that it is difficult to accurately position the hole.

For this reason, a lot of time is required for inserting a connection pin into the pin insertion hole provided in one buoy and the pin insertion hole provided in the other buoy, and workability when connecting between two adjacent buoys There is a problem of deterioration.

The present invention has been made in view of the above-mentioned problems of the prior art, and when connecting two members using a connecting pin, the two members enable the connecting pin to be smoothly inserted into the pin insertion holes respectively provided in the two members. It is an object to provide a connecting device.

(1) In order to solve the above problem, the present invention, the left and right first brackets provided to face the first member in the left and right directions, and the upper and lower spaces respectively installed on the first bracket And a first pin insertion hole at the bottom, a second bracket on the left and right facing the first bracket and provided to the second member connected to the first member, and spaced apart from each other by the upper and the lower bracket respectively. The upper and lower second pin insertion holes, the upper and lower first pin insertion holes, and the upper and lower second pin insertion holes, respectively, which can be installed so as to overlap the same axis as the upper and lower first pin insertion holes. The upper and lower second pin insertion holes are disposed between the upper and lower connecting pins to be inserted and the first and second lower right and left brackets, and the upper and lower connecting pins are inserted into the upper and lower first pin insertion holes. Upper and lower kites detachable against Provided with a pin attaching-detaching mechanism is applied to the second member the connecting device is made.

A feature of the present invention is that the upper connecting pin when the upper connecting pin is inserted into the upper first pin insertion hole and the upper second pin insertion hole at a position facing the second bracket of the second member. An upper centering member that matches the axis of the second axis with the axis of the upper second pin insertion hole, and the axis of the lower connection pin when the lower connection pin is inserted into the lower first pin insertion hole and the lower second pin insertion hole. Is provided with a lower centering member which coincides with the axis of the lower second pin insertion hole.

With this arrangement, when 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, the axis of the upper connecting pin is moved upward by the upper centering member. It can coincide with the axis line of a 2nd pin insertion hole. When the lower connecting 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 center pin member inserts the lower second pin pin axis line by the lower centering member. Can match the axis of the hole. As a result, the upper connecting pin can be smoothly inserted into the upper first pin insertion hole and the upper second pin insertion hole, and the lower connecting pin can be smoothly inserted into the lower first pin insertion hole and the lower second pin insertion hole. Therefore, the workability at the time of connecting a 1st bracket and a 2nd bracket using these upper and lower connection pins can be improved.

(2) In the present invention, the upper centering member extends in parallel with the second bracket from an upper angled corner of the second member, surrounds the upper second pin insertion hole, and is curved in an arc shape to form the upper portion. And a lower centering member extending in parallel with the second bracket from the lower angled corner of the second member, and the lower second pin insertion hole. It is formed by the plate body which has the contact groove part which curves in circular arc shape along the said lower connection pin, and makes it contact.

With this configuration, the second connecting member is connected to the upper connecting pin by engaging the engaging groove of the upper centering member provided in the second member with the upper connecting pin inserted into the upper first pin insertion hole of the first bracket. It rotates centering around, and the contact groove part of the lower centering member contacts the lower connection pin inserted in the lower 1st pin insertion hole of a 1st bracket. In this way, the engaging groove of the upper centering member is engaged with the upper connecting pin, and the contact groove of the lower centering member is brought into contact with the lower connecting pin, thereby inserting the axis of the upper connecting pin and the upper second pin. While coinciding the axis of the hole, the axis of the lower connecting pin and the axis of the lower second pin insertion hole can be coincided by the lower centering member.

(3) In the present invention, the upper and lower connecting pins have a larger diameter portion inserted into the upper and lower first pin insertion holes and the upper and lower second pin insertion holes, and smaller than the larger diameter portion. A small diameter portion having an outer diameter dimension and forming a gap between the upper and lower centering members while the large diameter portion is inserted into the upper and lower first pin insertion holes and the upper and lower second pin insertion holes. It is in what constituted.

With this arrangement, the small diameter portion and the upper center of the upper connecting pin are inserted in the 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 bet members. Thereby, it can suppress that the load transmitted between the 1st, 2nd bracket via an upper connecting pin is transmitted to the upper centering member, and similarly to this, between a 1st, 2nd bracket via a lower connecting pin. The load transmitted to can be suppressed from being transmitted to the 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.

(4) In addition, the present invention, the upper connecting pin detachment mechanism, the hydraulic cylinder is arranged to be stretchable at a position separated from the position of the axis of the upper connecting pin, and the hydraulic pressure from the position of the axis of the upper connecting pin A floating link disposed in a floating state movable in at least a direction perpendicular to an axis of the upper connecting pin, and inserted into the upper left first pin insertion hole of the left first bracket at a position spaced apart in the same direction as the cylinder; The left link connecting the left upper connecting pin and the hydraulic cylinder via the floating link, and the right upper connecting pin inserted into the right upper first pin insertion hole of the right first bracket and the hydraulic cylinder. And a lower link pin attachment / detachment mechanism at a position in the axis line of the lower link pin. A hydraulic cylinder that is elastically disposed at a spaced apart position, and a float that is movable at least in a direction orthogonal to the axis of the lower connecting pin at a position apart from the position of the axis of the lower connecting pin in the same direction as the hydraulic cylinder A floating link arranged in a state, a left link connecting the lower left connecting pin inserted into the lower left first pin insertion hole of the left first bracket and the hydraulic cylinder via the floating link, and the right side It is comprised by the right link which connected between the said lower right connection pin inserted in the lower right 1st pin insertion hole of a 1st bracket, and the said hydraulic cylinder via the said floating link.

With this configuration, when the hydraulic cylinder of the upper connecting pin detachment mechanism is expanded and contracted, the left and right links rotate in the left and right directions with the floating link as a point, and the upper and right upper connecting pins connected to the left and right links. By moving in the left and right directions, the left and right upper connecting pins can be attached to and detached from the left and right upper first pin insertion holes and the left and right upper second pin insertion holes. In addition, when the hydraulic cylinder of the lower connecting pin detachment mechanism is expanded and contracted, the left and right links rotate in the left and right directions with the floating link as a point, and the left and right lower connecting pins connected to the left and right links are left and right. By moving in the direction, the left and right lower connecting pins can be attached to and detached from the left and right lower first pin insertion holes and the left and right lower second pin insertion holes. In this way, the attachment and detachment of the upper and lower connecting pins to the left and right first brackets and the left and right second brackets can be easily performed using a hydraulic cylinder, so that the first member and the second member are connected or The workability at the time of separation or separation can be improved.

(5) In addition, in the present invention, the upper connecting pin detachment mechanism includes the left upper connecting pin inserted into the upper left first pin insertion hole of the left first bracket and the upper right first pin of the right first bracket. The cantilever is supported by the upper right connecting pin inserted into the insertion hole, and the lower connecting pin detachment mechanism includes the left lower connecting pin and the right first inserted into the lower left first pin insertion hole of the left first bracket. The cantilever is supported by the lower right connecting pin inserted into the lower right first pin insertion hole of the bracket.

Thereby, the upper connecting pin detachment mechanism cantilevers can be supported using the left and right upper connecting pins, and the lower connecting pin detachment mechanism can can be supported using the lower connecting pins left and right. Thereby, it can be said that the member for providing the upper and lower connection pin attachment / detachment mechanisms between the left and right first brackets is unnecessary, and the workability at the time of providing an upper and lower connection pin attachment / detachment mechanism can be improved.

(6) In addition, the present invention, the hydraulic cylinder of the upper connecting pin detachment mechanism is arranged to be stretchable in the same direction as the axis of the upper left pin and the upper right connecting pin, and the upper connecting pin detachment mechanism The left and right links are constituted by one link connecting the hydraulic cylinder and the floating link with respect to the left and right upper connection pins, and the hydraulic cylinder of the lower connection pin detachment mechanism is connected to the lower left connection. It is arranged to be stretchable in the same direction as the axis of the pin and the lower right connecting pin, the left and right links of the lower connecting pin detachment mechanism, the hydraulic cylinder and the floating link with respect to the lower connecting pins of the left and right. It consists of one link connecting each.

According to this configuration, when the hydraulic cylinder of the upper coupling pin detachment mechanism is expanded and contracted in the same direction as the axis of the upper coupling pins of the left and right, the left and right links rotate in the left and right directions with the connection portion with the floating link as a point. Thus, the left and right upper connecting pins can be attached to and detached from the left and right upper second pin insertion holes. When the hydraulic cylinder of the lower coupling pin attachment / detachment mechanism is expanded and contracted in the same direction as the axis of the lower coupling pins of the left and right, the left and right links are rotated in the left and right directions by making the connection portion with the floating link a point. The lower connecting pins on the right side can be attached and detached from the lower second pin insertion holes on the left and right sides.

(7) In addition, the present invention, the hydraulic cylinder of the upper connecting pin detachment mechanism is arranged to be stretchable in a direction orthogonal to the axis of the left upper connecting pin and the right upper connecting pin, the floating link is the hydraulic The left and right links of one end of the cylinder, the left and right links of the upper connection pin detachment mechanism, the left and right first links connecting the left and right upper connection pins and the floating link, and the other of the hydraulic cylinder. It consists of a 2nd link of the left and right which connects between the edge part and the middle part of the said 1st link of the left and right, The said hydraulic cylinder of the said lower connection pin detachment mechanism is the said lower left connection pin and the said right lower connection It is arranged to be stretchable in a direction orthogonal to the axis of the pin, the floating link is connected to one end of the hydraulic cylinder, and the left, The right link connects between the left and right first links connecting between the left and right lower connecting pins and the floating link, and the other end of the hydraulic cylinder and the middle portion of the left and right first links. It is the thing comprised by the 2nd link of the left and the right.

According to this configuration, the hydraulic cylinders constituting the upper and lower connecting pin attachment and detachment mechanisms are arranged to be stretchable in a direction orthogonal to the axes of the upper and lower connecting pins of the left and right and the lower connecting pins of the left and right. Even when the interval between the brackets is narrow, the upper and lower connecting pin attachment and detachment mechanisms can be easily disposed between the left and right first brackets.

1 is a front view showing a multi-bubble hydraulic excavator to which a two-member connecting device according to an embodiment of the present invention is applied;
2 is a front view illustrating a state in which a joint buoy is connected to a lower buoy;
3 is a perspective view showing a lower boom, left and right first brackets, an upper connecting pin detachment mechanism, and the like,
4 is a perspective view of some fractures showing an enlarged upper connecting pin, upper connecting pin detachable mechanism, etc .;
5 is a cross-sectional view of the left and right first brackets, connecting pins, connecting pin attaching mechanisms, and the like, in the direction of arrow VV in FIG.
6 is a cross-sectional view similar to FIG. 5 showing a state in which the connecting pin is moved to a connection position;
7 is a cross-sectional view of the connecting pin, the connecting pin detachment mechanism, and the like in the direction of arrow VII-VII in FIG. 5;
8 is a perspective view showing a joint pour, left and right second brackets, an upper centering member, a lower centering member, and the like;
FIG. 9 is a cross-sectional view of the left and right second brackets, the upper centering member, and the lower centering member viewed from the direction of arrow IX-IX in FIG. 2; FIG.
FIG. 10 is a cross-sectional view of the second bracket, the upper centering member, the lower centering member, and the like viewed from the direction of arrow XX in FIG. 9; FIG.
11 is a cross-sectional view of the upper connecting pin inserted into the first and second brackets from the same position as in FIG. 7;
12 is a cross-sectional view of the upper connecting pin inserted into the first and second brackets in the direction of arrows XII-XII in FIG. 11;
FIG. 13 is a cross-sectional view similar to FIG. 11 illustrating a state in which an upper connecting pin and a lower connecting pin are inserted into first and second brackets;
14 is a cross-sectional view of the upper connecting pin and the lower connecting pin inserted into the first and second brackets in the direction of arrow XIV-XIV in FIG. 13;
15 is a cross-sectional view similar to FIG. 14 showing a modification of the connecting pin attachment and detachment mechanism.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the 2 member connection apparatus which concerns on this invention is described in detail, referring an accompanying drawing, taking an example of connecting between two stage boomes which comprise the multi-boost of a hydraulic excavator.

In the drawing, 1 is a hydraulic excavator, and the hydraulic excavator 1 is a crawler-type lower traveling body 2 which is self-propelled, and an upper swinging body which is pivotally mounted on the lower traveling body 2. It is comprised by (3) and the multi-floor type work device 4 provided so that the front side of the upper revolving body 3 can float. The hydraulic excavator 1 is suitably used for dismantling a structure having a large ground height such as a high-rise building.

Here, the work device 4 is a buoy 5 composed of a lower buoy 5A, a joint buoy 5B, and an upper buoy 5C provided rotatably on the front side of the upper swinging body 3, and an upper buoy. An arm 7 composed of a middle arm 6 rotatably provided at the distal end side of 5C, a lower arm 7A and an upper arm 7B rotatably provided at the distal end side of the middle arm 6, It is roughly comprised by the crusher 8 as a work tool provided so that rotation was possible in the front end side of the upper arm 7B.

When installing the joint pour 5B in the lower pour 5A of the said pour 5, for example, as shown in FIG. 2, the joint pour 5B is hung up using the hydraulic crane 9 etc. In a state in which the joint buoy 5B is disposed on the tip side of the lower buoy 5A, the lower buoy 5A and the joint buoy 5B are connected using the two-member connecting device 11 described later. It is.

Next, the two-member connecting device 11 according to the present embodiment will be described in detail.

11 shows a two-member connecting device for connecting the lower pour 5A as the first member and the joint pour 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, and left and right lower first pin insertion holes ( 12D, 13D, left and right second brackets 14 and 15, left and right upper second pin insertion holes 14A and 15A, left and right lower second pin insertion holes 14B and 15B, left and right Upper connecting pins 16 and 17, left and right lower connecting pins 18 and 19, upper and lower connecting pin detachment mechanisms 20 and 31, upper centering member 33, lower centering member 34 It is comprised by such.

12 is a left first bracket provided on the left side of the tip end portion of the lower portion 5A serving as the first member, and the left first bracket 12 has left and right sides at regular intervals as shown in FIGS. 3 to 7. It consists of the left inner 1st bracket 12A and the left outer 1st bracket 12B which face in a direction. Here, the left inner first bracket 12A and the left outer first bracket 12B are each formed using a thick steel sheet or the like.

Then, the left inner first bracket 12A and the left outer first bracket 12B are fixed to the distal end of the lower buoy 5A forming an angled cylindrical shape by means of welding or the like, and the lower buoy 5A. Extends from the upper angled corner portion 5A1 to the upper and lower direction over the lower angled corner portion 5A2 (see FIG. 3). Moreover, between the left inner 1st bracket 12A and the left outer 1st bracket 12B, the left 2nd bracket 14 demonstrated later is arrange | positioned.

Here, the upper left side first pin insertion holes 12C and 12C are formed in the upper end of the left inner first bracket 12A and the left outer first bracket 12B, respectively, and the left inner first bracket 12A and On the lower end side of the left outer first bracket 12B, the lower left first pin insertion holes 12D and 12D are formed, respectively. The left upper connecting pin 16 described later is inserted into the left upper first pin insertion hole 12C in a detachable manner, and the left lower connecting pin described later in the lower left first pin insertion hole 12D. (18) is configured to be detachably inserted.

13 is a right first bracket provided on the right end of the lower part 5A, and this right first bracket 13 has a right inner first bracket 13A facing the left and right sides at regular intervals and a right side. It is comprised by the outer 1st 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 distal end of the lower pour 5A by means of welding or the like. In this state, it extends in the up and down direction from the upper angled corner portion 5A1 to the lower angled corner portion 5A2 of the lower pour 5A. Between the right inner 1st bracket 13A and the right outer 1st bracket 13B, the right 2nd bracket 15 demonstrated later is arrange | positioned.

Here, the upper right side first pin insertion holes 13C and 13C are formed in the upper end side of the right inner 1st bracket 13A and the right outer 1st bracket 13B, respectively, and the right inner 1st bracket 13A and The lower right 1st pin insertion hole 13D, 13D is formed in the lower end side of the right outer 1st bracket 13B, respectively. The upper right upper connecting pin 17 described later is detachably inserted into the upper right first pin insertion hole 13C, and the lower right lower connecting pin 19 described later is inserted into the lower right first pin insertion hole 13D. ) Is detachably inserted.

In this case, as shown in Fig. 5, the upper 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 upper first pin insertion hole 13C formed in the right inner first bracket 13A and the right outer first bracket 13B of the right first bracket 13 is disposed on the same axis O1-O1. It is. 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, and the right first bracket 13 The lower right first pin insertion hole 13D formed in the right inner first bracket 13A and the right outer first bracket 13B is disposed on the same axis O2-O2.

14 is a left 2nd bracket provided in the left side of the base end part of the joint pour 5B used as a 2nd member, This left 2nd bracket 14 is formed using the steel plate etc. with thick thickness. Then, the left second bracket 14 is fixed to the proximal end of the joint boom 5B forming an angular tubular shape by means of welding or the like, and lowered at the upper angled corner portion 5B1 of the joint boom 5B. It extends up and down over the edge part 5B2.

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 these left inner first brackets 12A. ) And the left outer first bracket 12B to face each other in the left and right directions (see FIG. 14). In addition, on the upper end side of the left second bracket 14, a left upper second pin insertion hole 14A is formed at a position corresponding to the left upper first pin insertion hole 12C of the left first bracket 12, The lower left second pin insertion hole 14B is formed at a lower end side of the left second bracket 14 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 proximal end of the joint pour 5B, and the right second bracket 15 is formed using a thick steel sheet or the like, and is welded to the proximal end of the joint pour 5B. In a fixed state by means, it extends in the up and down direction from the upper angled corner portion 5B1 to the lower angled corner portion 5B2 of the joint pour 5B.

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 these right inner first brackets 13A. ) And the right outer first bracket 13B in the left and right directions. Moreover, 15 A of upper right upper pin insertion holes are formed in the position corresponding to 13 C of upper right upper pin insertion holes of the right 1st bracket 13 at the upper end side of the right 2nd bracket 15, The lower right second pin insertion hole 15B is formed at the lower end side of the right second bracket 15 at a position corresponding to the lower right first pin insertion hole 13D of the right first bracket 13.

As shown in FIG. 14, the upper left second pin insertion hole 14A of the left second bracket 14 and the upper right second pin insertion hole 15A of the right second bracket 15 have a left side. The upper left first pin insertion hole 12C of the first bracket 12 and the upper right first pin insertion hole 13C of the right first bracket 13 can overlap each other as the same axis lines O1-O1. . On the other hand, 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 formed of the left first bracket 12. The left lower first pin insertion hole 12D and the right lower first pin insertion hole 13D of the right first bracket 13 can overlap each other with the same axis line O2-O2. Moreover, between the left and right 2nd brackets 14 and 15, the upper centering member 33 of the left and right demonstrated below, and the lower centering member 34 of the left and right are provided.

16 shows the left upper first pin insertion hole 12C of the left first bracket 12 and the left upper connecting pin inserted into the left upper second pin insertion hole 14A of the left second bracket 14. . The left upper connecting pin 16 is detached from the left upper second pin insertion hole 14A by moving between the disengage position shown in FIG. 5 and the connect position shown in FIG. 6. Here, as shown in FIG. 6, the upper left connecting pin 16 is 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 stepped portion extending in the left and right directions by the small diameter portion 16B having an outer diameter dimension D2 (D1> D2) smaller than the outer diameter dimension D1 of the large diameter portion 16A. It is formed in the shape of a cylinder. In the small diameter portion 16B, a notch portion 16C penetrating in the radial direction is formed, and the tip portion of the left link 23 described later is inserted into the notch portion 16C.

17 is an upper right first pin insertion hole 13C of the right first bracket 13 and an upper right upper connection pin inserted into the upper right second pin insertion hole 15A of the right second bracket 15. The right upper connection pin 17 is attached to and detached from the right upper second pin insertion hole 15A. Here, the right upper connecting pin 17 also has a large diameter that is slidably inserted into the right upper first pin insertion hole 13C and the right upper second pin insertion hole 15A, similarly to the left upper connecting pin 16. It is comprised by the part 17A, the small diameter part 17B which became smaller diameter than the said big diameter part 17A, and the notch part 17C, The inside of the notch part 17C demonstrated the right side link 26 later. ) Is configured to insert the leading end.

18 shows the lower left first pin insertion hole 12D of the left first bracket 12 and the lower left connecting pin inserted into the lower left second pin insertion hole 14B of the left second bracket 14. . The lower left connection pin 18 is attached to and detached from the lower left second pin insertion hole 14B by moving between the release position shown in FIG. 5 and the connection position shown in FIG. 6. Here, as shown in FIG. 6, the lower left connecting pin 18 is 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 stepped portion extending in the left and right directions by the small diameter portion 18B having an outer diameter dimension D2 (D1> D2) smaller than the outer diameter dimension D1 of the large diameter portion 18A. It is formed in the shape of a cylinder. In the small diameter portion 18B, a notch portion 18C penetrating in the radial direction is formed, and the tip portion of the left link 23 described later is inserted into the notch portion 18C.

19 is a lower right first pin insertion hole 13D of the right first bracket 13 and a lower right connection pin inserted into the lower right second pin insertion hole 15B of the right second bracket 15. The lower right connection pin 19 is attached to and detached from the lower right second pin insertion hole 15B. Here, the lower right connection pin 19 also has a large diameter slidably inserted into the lower right first pin insertion hole 13D and the lower right second pin insertion hole 15B, similarly to the lower left connection pin 18. The right link 26 which is comprised later by the part 19A, the small diameter part 19B which became smaller diameter than the said big diameter part 19A, and the notch part 19C, is demonstrated later in the notch part 19C. ) Is configured to insert the leading end.

Next, the upper connection pin attachment / detachment mechanism 20 which attaches the upper and left connection pins 16 and 17 to the left and right second brackets 14 and 15 will be described.

20 shows the upper connection pin detachment mechanism disposed between the left first bracket 12 and the right first bracket 13. The upper connection pin attachment / detachment mechanism 20 attaches and detaches the left upper connection pin 16 with respect to the left upper second pin insertion hole 14A of the left second bracket 14, and at the same time, the right upper connection pin ( 17 is attached to or detached from the upper right second pin insertion hole 15A of the right second bracket 15. As shown in FIGS. 4-7, the upper connection pin attachment / detachment mechanism 20 is comprised by the hydraulic cylinder 21, the floating link 22, the left link 23, the right link 26, etc. which are demonstrated later. have.

21 is a hydraulic cylinder constituting the upper coupling pin attachment / detachment mechanism 20. The hydraulic cylinder 21 is a tube 21A, a piston (not shown), a proximal end fixed to the piston, and a proximal end of the tube ( It is comprised by the rod 21B which protruded from 21A. The hydraulic cylinders 21 are left and right upper connecting pins 16 and 17 at positions separated from the positions of the axes O1-O1 of the left and right upper connecting pins 16 and 17 in the up and down directions. It is arrange | positioned in the state which can expand and contract in the same direction (left, right direction) with the axis line O1-O1 of the.

22 shows the floating link arrange | positioned at the position spaced apart in the up-down direction from the position of the axis line O1-O1 of the left and right upper connection pins 16 and 17. As shown in FIG. The floating link 22 is not provided anywhere on the left and right first brackets 12 and 13, and is floating with respect to the left and right first brackets 12 and 13 and extends in the left and right directions. It is. In addition, the floating link 22 uses the left and right upper connecting pins 16 and 17 connected to the left and right links 23 and 26 described later in the left and right directions along the expansion and contraction of the hydraulic cylinder 21. It is to construct a point to move.

Here, the floating link 22 is formed in a square column shape extending in the left and right directions, and the length dimension in the left and right directions of the floating link 22 is the left inner first bracket 12A and the right inner first. It is set slightly smaller than the space | interval of bracket 13A. Moreover, the U-shaped recessed groove part 22A is formed in the both ends of the floating link 22 in the left-right direction, and the said recessed groove part 22A is slidable to the anti-loosening board 29 demonstrated later. It's a catch. The floating link 22 is disposed between the left and right upper connecting pins 16 and 17 and the hydraulic cylinder 21, and one end of the floating link 22 in the left and right directions is described later. The pin 23 is pivotally connected to the link 23, and the other end of the left and right directions of the floating link 22 is pivotally connected to the right link 26 described later.

23 shows a left link connecting the upper left connecting pin 16 and the hydraulic cylinder 21 via the floating link 22. Here, the left link 23 is made up of a block body extending in the up and down direction as a whole, and the proximal end of the left link 23 is a notched portion 23A notched in a bifurcated shape at regular intervals. . The distal end portion of the rod 21B of the hydraulic cylinder 21 is pinned to the notch portion 23A of the left link 23 so as to be rotatable using the pin 24.

Further, the tip of the left link 23 is pivotably pinned using the pin 25 to the left upper connecting pin 16 while being inserted into the notch 16C of the left upper connecting pin 16. Are combined. Moreover, the stopper 23B which protrudes toward the left 1st bracket 12 is provided in the front end side of the left link 23, The stopper 23B is the connection in which the upper left connection pin 16 is shown in FIG. When it moves to a position, it contacts with the inner left 1st bracket 12A, and sets the connection position of the upper left connection pin 16. As shown in FIG.

 26 shows a right link connecting the right upper connecting pin 17 and the hydraulic cylinder 21 via the floating link 22. The right side link 26 is made up of a block body extending in the up and down direction as a whole, and the proximal end of the right side link 26 is a notched portion 26A notched in a bifurcated shape at regular intervals. The bottom side of the tube 21A of the hydraulic cylinder 21 is pinned to the notch portion 26A of the right link 26 so as to be rotatable using the pin 24.

Here, the tip portion of the right link 26 is pivotably pinned using the pin 25 to the right upper connecting pin 17 while being inserted into the notch 17C of the upper right connecting pin 17. Are combined. Moreover, the stopper 26B which protrudes toward the right 1st bracket 13 is provided in the front end side of the right link 26, The stopper 26B is the connection of the upper right connection pin 17 shown in FIG. When it moves to a position, it contacts with the right inner 1st bracket 13A, and sets the connection position of the upper right connection pin 17. FIG.

In addition, one side (left side) of the left and right directions of the floating link 22 is pinned in the middle part of the longitudinal direction of the said left link 23 in the state inserted in the notch part 23A of the left link 23. FIG. It is pinned so that rotation is possible using (27). On the other hand, the other side (right side) of the left and right directions of the floating link 22 is inserted into the notch part 26A of the right side link 26, and is located in the middle part of the longitudinal direction of the said right side link 26. It is pinned so that rotation is possible using the pin 28.

Therefore, when the hydraulic cylinder 21 is reduced, the left upper connecting pin 16 has the left upper first pin insertion hole 12C of the left first bracket 12 and the left side of the left second bracket 14. It is inserted into the upper second pin insertion hole 14A. On the other hand, the upper right connecting pin 17 is 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. It becomes the structure to become (refer FIG. 14).

On the other hand, in the case where the hydraulic cylinder 21 is extended, the left upper connecting pin 16 has a left upper first pin insertion hole 12C and a left second bracket 14 of the left outer first bracket 12A. Is taken out from the upper left second pin insertion hole 14A. On the other hand, the right upper connection pin 17 is formed from the right upper first pin insertion hole 13C of the right outer first bracket 13B and the right second pin insertion hole 15A of the right second bracket 15. It is configured to be pulled out.

29 is a left and right loosening prevention plate provided in the left and right 1st brackets 12 and 13, respectively. Each of these anti-loosening plates 29 consists of a rectangular plate body extending in the up and down directions, and on the inner surface of the left inner first bracket 12A and the inner surface of the right inner first bracket 13A, Each is fixed using means such as welding. On the other hand, the recessed groove part 22A provided in the both ends of the floating link 22 is slidably engaged with the left and right loosening prevention plates 29, respectively.

Therefore, when the left and right upper connecting pins 16 and 17 move between the connecting position and the disengaging position by the expansion and contraction of the hydraulic cylinder 21, the recessed groove portions 22A formed at both ends of the floating link 22 are formed. By engaging the release preventing plate 29, the upper connecting pin attachment / detachment mechanism 20 can be prevented from rotating about the upper connecting pins 16, 17 on the left and right sides.

30 denotes a flat upper stopper which is located between the left and right first brackets 12 and 13 and is provided in the lower pour 5A. The upper stopper 30 is fixed to the upper end side by means of welding or the like at the upper end of the lower pour 5A, and extends to a position where the distal end faces the upper and left connecting pins 16 and 17. have. In addition, as shown in FIG. 5, the upper stopper 30 contacts the small diameter part 16B, 17B of the left and right upper connection pins 16 and 17, and these upper and left upper connection pins ( 16 and 17) to set the departure position.

In this case, when the small diameter portions 16B and 17B of the left and right upper connecting pins 16 and 17 abut the upper stopper 30, respectively, the left upper connecting pin 16 is the left inner first. It is inserted only in the upper left first pin insertion hole 12C of the bracket 12A, and the right upper connection pin 17 is inserted only in the upper right first pin insertion hole 13C of the right inner first bracket 13A. Maintain state. Therefore, the upper coupling pin detachment mechanism 20 is in a state of cantilever support between the left inner first bracket 12A and the right inner first bracket 13A via the left and right upper coupling pins 16 and 17. The configuration is maintained at.

Next, the lower connection pin attachment / detachment mechanism 31 which attaches and detaches the left and right lower connection pins 18 and 19 with respect to the left and right 2nd brackets 14 and 15 is demonstrated.

31 shows the lower connection pin attachment / detachment mechanism disposed between the left first bracket 12 and the right first bracket 13. The lower connection pin attachment / detachment mechanism 31 attaches and detaches the lower left connection pin 18 with respect to the lower left second pin insertion hole 14B of the left second bracket 14, and at the same time, the lower right connection pin ( 19 is attached to or detached from the right lower second pin insertion hole 15B of the right second bracket 15.

Here, the lower coupling pin detachment mechanism 31 is spaced apart in the up and down directions from the positions of the axes O2-O2 of the lower coupling pins 18 and 19 on the left and right sides, similarly to the upper coupling pin detachment mechanism 20. The hydraulic cylinder 21 arranged at the closed position, the floating link 22 disposed in a floating state between the hydraulic cylinder 21 and the left and right lower connecting pins 18, 19, and the floating link 22 It is comprised by the left and right links 23 and 26 which connect between the left and right lower connection pins 18 and 19 and the hydraulic cylinder 21 via (circle).

In this case, the notch portion 23A on the proximal side of the left link 23 is pinned to the rod 21B of the hydraulic cylinder 21 using the pin 24, and the tip portion of the left link 23 is The pin is connected to the lower left connection pin 18 using the pin 25, and the middle portion in the longitudinal direction of the left link 23 is pin-connected to the floating link 22 using the pin 27. On the other hand, the notch part 26A of the base end side of the right link 26 is pinned to the tube 21A of the hydraulic cylinder 21 using the pin 24, and the tip part of the right link 26 is a right side. The pin 25 is pinned to the lower connection pin 19, and the middle portion in the longitudinal direction of the right link 26 is pinned to the floating link 22 using the pin 28.

32 is a flat lower stopper which is located between the left and right first brackets 12 and 13 and is provided in the lower buoy 5A. The lower stopper 32 has a proximal end at the lower end of the lower buoy 5A. Is fixed by means of welding or the like, and extends to a position where the front end faces the lower connecting pins 18 and 19 on the left and right sides. As shown in Fig. 5, the lower stopper 32 contacts the small diameter portions 18B and 19B of the left and right lower connecting pins 18 and 19 so that these lower and right lower connecting pins 18, 19) to set the exit position.

In this case, when the small diameter portions 18B and 19B of the left and right lower connecting pins 18 and 19 abut against the lower stopper 32, respectively, the lower left connecting pin 18 is the left inner first. It is inserted only in the lower left first pin insertion hole 12D of the bracket 12A, and the lower right connection pin 19 is inserted only in the lower right first pin insertion hole 13D of the right inner first bracket 13A. Maintain state. Accordingly, the lower coupling pin attachment / removal mechanism 31 is in a state of cantilever support between the left inner first bracket 12A and the right inner first bracket 13A via the left and right lower coupling pins 18 and 19. The structure is maintained as.

Next, the upper centering member 33 which performs centering of the left and right upper connecting pins 16 and 17 is demonstrated. That is, 33 denotes the upper center centering members on the left and right sides provided in the joint pour 5B. The upper center centering member 33 is provided in the upper first pin insertion holes 12C and 13C provided in the left and right first brackets 12 and 13 in the left and right second brackets 14 and 15. In the case of inserting the second pin insertion holes 14A and 15A and the left and right upper connecting pins 16 and 17, the axis of these left and right upper connecting pins 16 and 17 is defined by The first pin insertion holes 12C and 13C and the upper and second upper pin insertion holes 14A and 15A of the left and right axes coincide with the axes O1-O1.

Here, the upper left centering member 33 has a left inner first when the left second bracket 14 is disposed between the left inner first bracket 12A and the left outer first bracket 12B. It is arrange | positioned in the position which faces the left 2nd bracket 14 with the bracket 12A interposed. On the other hand, the right upper centering member 33 has a right inner first when the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B. It is arrange | positioned in the position which faces the right 2nd bracket 15 with the bracket 13A interposed between (refer FIG. 12).

As shown in FIGS. 8-10, the upper center-centering member 33 is formed in substantially triangular shape as a whole using the plate body thinner than the 2nd bracket 14 and 15 of left and right, It extends from the upper angled corner portion 5B1 of 5B to a position corresponding to the left and right upper second pin insertion holes 14A and 15A while facing in parallel with the left and right second brackets 14 and 15. .

Here, the upper centering member 33 has a mount portion 33A fixed to the upper angular corner portion 5B1 of the joint pour 5B by means of welding or the like, and has a mountain shape from the mount portion 33A. The protrusion 33B protruding from the protrusion and the distal end of the protrusion 33B are formed in a downward direction, and are curved in an arc shape surrounding the upper and second upper pin insertion holes 14A and 15A of the left and right sides. It is comprised by the groove part 33C substantially. In this case, the engaging groove portion 33C is formed in an arc shape having a radius of curvature substantially the same as that of the upper and second upper pin insertion holes 14A and 15A on the left and right sides. It's supposed to hook up from the top. Moreover, the lower part of the engaging groove part 33C becomes the tapered opening part 33D opened larger than the hole diameter of the upper-left upper 2nd pin insertion hole 14A, 15A, and is along this opening part 33D. The upper and lower coupling pins 16 and 17 are guided to the engaging groove portion 33C.

Here, 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. The case where the left and right upper connecting pins 16 and 17 are inserted into the case will be described. First, as shown in FIG. 11 and FIG. 12, the left and right upper diameter connecting portions 16A and 17A of the upper and left upper connecting pins 16 and 17 protruding from the left and right inner first brackets 12A and 13A are respectively positioned on the left side. The engaging grooves 33C of the upper centering member 33 on the right are engaged with each other from above. In this case, the engaging groove portion 33C has the same radius of curvature as the upper and second upper pin insertion holes 14A and 15A of the left and right, so that the engaging groove portion of the upper centering member 33 on the left and right sides ( 33C) is engaged with the left and right upper connecting pins 16 and 17, so that the axis of the left and right upper connecting pins 16 and 17 is aligned with the left and right upper second pin insertion holes 14A and 15A. It can coincide with axis O1-O1.

In this way, the upper center centering member 33 on the left and right has the axes of the upper and second connecting pins 16 and 17 on the left and right, and the axes O1-O1 of the upper and second pin insertion holes 14A and 15A on the left and right. ) As a result, the upper coupling pin attachment / detachment mechanism 20 is provided with the upper first pin insertion holes 12C and 13C of the left and right first brackets 12 and 13 and the left and right second brackets 14 and 15. The upper connecting pins 16, 17 on the left and right sides can be smoothly inserted into the upper second pin insertion holes 14A, 15A.

The lower centering member 34 for centering the left and right lower connecting pins 18 and 19 will also be described.

34 has shown the lower centering member of the left and right provided in the joint pour 5B. The lower centering member 34 has lower first pin insertion holes 12D and 13D provided in the left and right first brackets 12 and 13 and lower parts provided in the left and right second brackets 14 and 15. In the case of inserting the left and right lower connecting pins 18 and 19 into the second pin insertion holes 14B and 15B, the axes of these left and right lower connecting pins 18 and 19 are set to the left and right lower ends. The first pin insertion holes 12D and 13D and the left and right lower second pin insertion holes 14B and 15B coincide with the axes O2-O2.

Here, when the left lower centering member 34 arrange | positions the left 2nd bracket 14 between the left inner 1st bracket 12A and the left outer 1st bracket 12B, the left inner 1st It is arrange | positioned in the position which faces the left 2nd bracket 14 with the bracket 12A interposed. On the other hand, the lower center centering member 34 on the right side is the right inner first when the right second bracket 15 is disposed between the right inner first bracket 13A and the right outer first bracket 13B. It is arrange | positioned in the position which faces the 2nd right bracket 15 on both sides of bracket 13A.

As shown in FIGS. 8-10, the lower centering member 34 is formed in substantially triangular shape as a whole using the plate body thinner than the 2nd brackets 14 and 15 of left and right, It extends from the lower angled corner portion 5B2 of 5B) to a position corresponding to the left and right lower second pin insertion holes 14B and 15B while facing in parallel with the left and right second brackets 14 and 15. .

Here, the lower centering member 34 has a mounting portion 34A fixed to the lower angled corner portion 5B2 of the joint pour 5B by means of welding or the like, and has a mountain shape from the mounting portion 34A. Protrusions 34B protruding from each other and the tip end portions of the protrusions 34B are formed by the side of the joint pour 5B, and the contact is curved in an arc shape along the left and right lower second pin insertion holes 14B and 15B. It is comprised by the groove part 34C substantially. In this case, the abutting groove portion 34C is formed in an arc shape having a radius of curvature substantially the same as that of the upper and second upper pin insertion holes 14A and 15A on the left and right sides, and the lower connecting pins 18 and 19 on the left and right sides. It engages from a front and back direction (arrow A direction in FIG. 11).

In this case, as shown in FIG. 11 and FIG. 12, the joint pour 5B is the upper part of the left and right inserted in the upper 2nd pin insertion hole 14A, 15A of the 2nd bracket 14, 15 of the left and right. With the connecting pins 16 and 17 as the center, they rotate in the forward and backward directions (arrow A direction).

Thereby, as shown to FIG. 13 and FIG. 14, in large diameter part 18A, 19A of the left and right lower connection pins 18, 19 which protruded from the inner 1st bracket 12A, 13A of left and right. The contact grooves 34C of the lower centering member 34 on the left and right sides abut each. In this case, the contact groove portion 34C has a radius of curvature substantially the same as that of the left and right lower second pin insertion holes 14B and 15B, so that the contact groove portion of the lower centering member 34 on the left and right sides ( 34C) abuts against the left and right lower connecting pins 18 and 19, so that 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. It can coincide with axis O2-O2.

In this way, the lower centering member 34 on the left and the right has an axis line of the lower connecting pins 18, 19 on the left and right, and the axis line O2- of the lower second pin insertion holes 14B, 15B on the left and right. O2). Thereby, the lower connection pin attachment / detachment mechanism 31 has lower 1st pin insertion holes 12D and 13D of the 1st bracket 12 and 13 of the left and right, and the 2nd brackets 14 and 15 of the left and right. The lower connection pins 18, 19 on the left and right sides can be smoothly inserted into the lower second pin insertion holes 14B, 15B on the lower side.

The two-member connecting device 11 according to the present embodiment has the configuration as described above, and then uses the two-member connecting device 11 to form a lower portion constituting the buoy 5 of the hydraulic excavator 1. The case where the joint pour 5B is provided on the front end side of the pour 5A will be described.

First, as shown in FIG. 2, the joint boom 5B is hung up using the hydraulic crane 9, and the base end side of this joint boom 5B is the upper pivot 3 side of the hydraulic excavator 1 side. It is arrange | positioned at the front end side of 5 A of lower pours provided in this.

At this time, as shown in FIG. 5, the upper connection pin attachment / detachment mechanism 20 makes the left upper connection pin 16 hold | maintain the left upper connection pin 16 of the left inner 1st bracket 12A, in the state which extended the hydraulic cylinder 21. FIG. It inserts into 1 pin insertion hole 12C, and inserts the upper right connection pin 17 into the upper right upper pin insertion hole 13C of the right inner 1st bracket 13A. As a result, the upper coupling pin attachment / detachment mechanism 20 is in a disengaged position and is held between the left inner first bracket 12A and the right inner first bracket 13A, and the left and right upper coupling pins 16, A part of large diameter part 16A, 17A of 17) protrudes inward from the inner 1st bracket 12A, 13A of left and right.

On the other hand, the lower connection pin attachment / removal mechanism 31 also moves the lower left connection pin 18 to the lower left first pin insertion hole 12D of the left inner first bracket 12A while the hydraulic cylinder 21 is extended. The lower right connecting pin 19 is inserted into the lower right first pin insertion hole 13D of the right inner first bracket 13A. As a result, the lower connecting pin attachment / detachment mechanism 31 is in the disengaged position and is held between the left inner first bracket 12A and the right inner first bracket 13A, and the left and right lower connecting pins 18, A part of large diameter part 18A, 19A of 19 protrudes inward from the left 1st inside 1st bracket 12A, 13A.

Next, as shown in FIG. 11, the joint pour 5B suspended by the hydraulic crane 9 is moved downward toward lower pour 5A, and the upper centering member 33 of the left and right engages. The groove portion 33C is engaged with the large diameter portions 16A, 17A of the left and right upper connecting pins 16, 17 protruding from the left and right inner first brackets 12A, 13A from above. As a result, the axis lines of the left and right upper connecting pins 16 and 17 can be aligned with the axis lines O1 to O1 of the left and right upper second pin insertion holes 14A and 15A.

In this state, by reducing the hydraulic cylinder 21 of the upper connecting pin attachment / detachment mechanism 20, as shown in FIG. 12, the left and right upper connecting pins 16 and 17 are attached to the left and right first brackets 12. It is possible to smoothly insert into the upper first pin insertion holes 12C and 13C of the upper and lower pins 13 and the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15.

Next, by moving the joint pour 5B further downward, the left and right second brackets 14 and 15 are moved forward and backward in the center of the upper and left connecting pins 16 and 17 (in FIG. 11). In the direction of arrow A). As a result, as shown in FIG. 13, left and right 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 abutting groove 34C of the lower center centering member 34 on the right side is brought into contact with each other so that the axis of the left and right lower connecting pins 18 and 19 is aligned with the left and right lower second pin insertion holes 14B and 15B. It can coincide with axis O2-O2.

In this state, as shown in FIG. 14, by lowering the hydraulic cylinder 21 of the lower coupling pin attachment / detachment mechanism 31, the left and right lower coupling pins 18 and 19 are connected to the left and right first brackets 12. And the lower first pin insertion holes 12D and 13D of the 13 and the lower second pin insertion holes 14B and 15B of the left and right second brackets 14 and 15, respectively.

In this way, the left and right first brackets 12 and 13 attached to the lower buoy 5A and the left and right second brackets 14 and 15 attached to the joint buoy 5B are connected to the upper left and right sides. By connecting using the pins 16 and 17 and the left and right lower connecting pins 18 and 19, the joint buoy 5B can be provided on the tip side of the lower buoy 5A.

Here, as shown to FIG. 13 and FIG. 14, the large diameter part 16A, 17A of the upper connection pins 16, 17 of the left and right sides is made into the upper 1st pin of the 1st bracket 12, 13 of the left and right sides. Engagement of the upper centering member 33 on the left and right sides with the insertion holes 12C and 13C inserted into the upper second pin insertion holes 14A and 15A of the left and right second brackets 14 and 15, respectively. The groove portion 33C faces the small diameter portions 16B and 17B of the upper connecting pins 16 and 17. Thereby, between the engaging groove part 33C of the upper center-centering member 33 of the left and right sides, and the upper connecting pins 16 and 17, the outer diameter dimension D1 and the small diameter of the large diameter part 16A are small. A gap ΔD corresponding to the difference in the outer diameter dimension D2 of the portion 16B is formed (see FIG. 14).

Similarly, the large diameter portions 18A, 19A of the left and right lower connecting pins 18, 19 are connected to the lower first pin insertion holes 12D, 13D of the first brackets 12, 13 of the left, right sides. In the state inserted into the lower 2nd pin insertion hole 14B, 15B of the 2nd bracket 14, 15 of a left, right side, the contact groove part 34C of the lower centering member 34 of the left, right side connects a lower part. The small diameter portions 18B and 19B of the pins 18 and 19 face each other. As a result, the outer diameter dimension D1 of the large diameter portion 18A and the small diameter portion between the contact groove portion 34C of the lower center-centering member 34 on the left and right sides and the lower connecting pins 18 and 19. A gap ΔD corresponding to the difference in the outer diameter dimension D2 of 18B is formed (see FIG. 13).

For this reason, 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 the upper left and right sides. Transmission to the centering member 33 can be suppressed. In addition, 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 are lower centers of the left and right sides. Delivery to the bet member 34 can be suppressed. As a result, the upper center positioning member 33 and the lower center positioning member 34 on the left and right sides can be formed using a thin plate or the like, and the weight can be reduced.

In this way, according to this embodiment, in the position which faces the 2nd bracket 14, 15 of left and right through the inside 1st bracket 12A, 13A of left and right among the joint pour 5B, The upper center centering member 33 and the lower center centering member 34 of the right side are provided. For this reason, by engaging the engaging groove part 33C of the upper centering member 33 to the upper connecting pins 16 and 17 of the left and right, the axis of the upper connecting pins 16 and 17 of the left and right is left. And the axis lines O1-O1 of the upper second pin insertion holes 14A, 15A provided in the right second brackets 14, 15. Similarly, the left and right lower connecting pins 18 and 19 are brought into contact with the abutting groove portion 34C of the lower centering member 34 so that the left and right lower connecting pins 18 and 19 have an axis line. It can match the axis line O2-O2 of the lower 2nd pin insertion hole 14B, 15B provided in the 2nd bracket 14, 15 of the right side.

As a result, the left and right upper connecting pins 16 and 17 can be smoothly inserted into the upper first pin insertion holes 12C and 13C of the left and right and the upper second pin insertion holes 14A and 15A of the left and right. It is possible to smoothly insert the left and right lower connecting pins 18 and 19 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. . Thus, by using the left and right upper connecting pins 16 and 17 and the left and right lower connecting pins 18 and 19, the first and second brackets 12 and 13 on the left and right sides and the second and second brackets 14 and 15 on the left and right sides. ) Can be quickly connected, and workability at the time of connecting the joint pour 5B to the lower pour 5A can be improved.

In addition, in the above-described embodiment, the hydraulic cylinder 21, the floating link 22, and the left and right links (up and down connecting pin attachment and detachment mechanisms 20 and 31 extending in the left and right directions are arranged). 23 and 26 exemplify the case where the configuration is made. However, this invention is not limited to this, For example, you may use the upper and lower connection pin attachment / detachment mechanisms 41 and 42 like the modification shown in FIG.

That is, the hydraulic cylinder 43 which is arranged so that the upper and lower connecting pin detachment mechanisms 41 and 42 can be stretched and contracted in the direction (up and down direction) perpendicular to the axis of the upper and lower connecting pins 16 and 17. And a floating link 44 pinned to one end of the hydraulic cylinder 43, a left first link 45 for connecting between the upper left connecting pin 16 and the floating link 44, and a right side. The left first link 46 connecting the upper connecting pin 17 and the floating link 44 between the right end link 46 and the other end of the hydraulic cylinder 43 and the left first link 45. You may comprise with the 2nd link 47 and the right 2nd link 48 which connects between the other end of the hydraulic cylinder 43, and the right 1st link 46. As shown in FIG.

In addition, a hydraulic cylinder having two rods, left and right, is disposed coaxially with the left and right upper connecting pins 16 and 17, and the left rod is connected to the left upper connecting pin 16 and at the same time It may be configured to connect to the upper right connection pin 17.

Moreover, in said embodiment, the left 1st bracket 12 is comprised by two board bodies, the left inner 1st bracket 12A and the left outer 1st bracket 12B, and the right 1st bracket 13 ) Is exemplified by the two plate bodies of the right inner first bracket 13A and the right outer first bracket 13B. However, the present invention is not limited to this, for example, the left first bracket is constituted only by the left inner first bracket 12A, and the right first bracket is formed only by the right inner first bracket 13A. You may comprise.

In the above-described embodiment, the two-member connecting device 11 is the lower part of the lower part 5A, the joint part 5B, and the upper part 5C constituting the part 5 of the hydraulic excavator 1. The case where it is used for the connection part of the pour 5A and the joint pour 5B is illustrated. However, the present invention is not limited to this, for example, the connection portion of the joint pour 5B and the upper pour 5C, the connection of the lower arm 7A and the upper arm 7B constituting the arm 7. It can also be used for parts.

5A: Lower pour (first member) 5B: Joint pour (second member)
11: two-member connecting device 12 left first bracket
12C: Left upper first pin insertion hole
12D: Lower left first pin insertion hole
13: right first bracket
13C: Right upper first pin insertion hole
13D: Lower right first pin insertion hole
14: left second bracket
14A: Left upper second pin insertion hole
14B: Lower left second pin insertion hole
15: right second bracket
15A: Right upper second pin insertion hole
15B: Lower right second pin insertion hole
16: upper left connection pin
Large diameter part: 16A, 17A, 18A, 19A
16B, 17B, 18B, 19B: small diameter
17: Upper right connection pin 18: Lower left connection pin
19: lower right connecting pin 20, 41: upper connecting pin detachable mechanism
21, 43: hydraulic cylinders 22, 44: floating link
23: left link 26: right link
31, 42: lower connecting pin detachable mechanism 33: upper centering member
33C: engagement groove 34: lower centering member
34C: abutting groove 45: left first link (link)
46: Right first link (link) 47: Left second link (link)
48: right second link (link)

Claims (7)

Left and right first brackets 12 and 13 provided to face the first member 5A in left and right directions,
Upper and lower first pin insertion holes 12C, 12D, 13C, and 13D provided in the left and right first brackets 12 and 13, respectively, spaced apart from each other;
Left and right second brackets 14 and 15 provided on the second member 5B connected to the first member 5A and facing the first brackets 12 and 13;
Upper and lower agents which are installed in the left and right second brackets 14 and 15 apart from each other up and down, and overlap each other with the same axis as the upper and lower first pin insertion holes 12C, 12D, 13C, and 13D. 2 pin insertion holes (14A, 14B, 15A, 15B),
Upper and lower connection pins 16 and 17 respectively inserted into the upper and lower first pin insertion holes 12C, 12D, 13C and 13D and the upper and lower second pin insertion holes 14A, 14B, 15A and 15B, respectively. , 18, 19),
The upper and lower connecting pins 16, 17, 18, and 19 are disposed between the left and right first brackets 12 and 13 to insert the upper and lower first pin insertion holes 12C, 12D, 13C, and 13D. Two-member connection comprising upper and lower connection pin attachment and detachment mechanisms 20, 31, 41, and 42 that are attached to and detached from the upper and lower second pin insertion holes 14A, 14B, 15A, and 15B in the state of insertion. In the apparatus,
At a position facing the second brackets 14 and 15 of the second member 5B,
When the upper connecting pins 16 and 17 are inserted into the upper first pin insertion holes 12C and 13C and the upper second pin insertion holes 14A and 15A, the axes of the upper connecting pins 16 and 17 are removed. An upper centering member 33 coinciding with the axes of the upper second pin insertion holes 14A and 15A,
When the lower connecting pins 18 and 19 are inserted into the lower first pin insertion holes 12D and 13D and the lower second pin insertion holes 14B and 15B, the axes of the lower connecting pins 18 and 19 are removed. A lower member centering member (34) adapted to coincide with the axis of the lower second pin insertion holes (14B, 15B). The method of claim 1,
The upper centering member 33 extends in parallel with the second brackets 14 and 15 from the upper angled corner portion 5B1 of the second member 5B, and the upper second pin insertion hole 14A. , 15A is formed by a plate body having an engaging groove portion 33C which is curved in an arc shape and engaged with the upper connecting pins 16 and 17,
The lower centering member 34 extends in parallel from the lower angled corner portion 5B2 of the second member 5B to the second brackets 14 and 15, and the lower second pin insertion hole 14B. And 15B) formed by a plate body having an abutting groove portion 34C which is curved in an arc shape along the lower connecting pins (18, 19). The method of claim 1,
The upper and lower connection pins 16, 17, 18, and 19 have upper and lower first pin insertion holes 12C, 12D, 13C, and 13D, and upper and lower second pin insertion holes 14A, 14B, Large diameter portions 16A, 17A, 18A, 19A inserted into 15A, 15B, and larger diameter portions 16A, 17A, having a smaller outer diameter dimension than the larger diameter portions 16A, 17A, 18A, 19A. 18A, 19A are inserted into the upper and lower first pin insertion holes 12C, 12D, 13C, and 13D and the upper and lower second pin insertion holes 14A, 14B, 15A, and 15B. A two-member connecting device comprising a small diameter portion (16B, 17B, 18B, 19B) forming a gap between the lower centering members (33, 34). The method of claim 1,
The upper connection pin detachment mechanism 20, 41,
The hydraulic cylinders 21 and 43 which are elastically arranged at positions separated from the positions of the axes of the upper connecting pins 16 and 17, and the hydraulic cylinders (from the positions of the axes of the upper connecting pins 16 and 17). A floating link 22 and 44 arranged in a floating state capable of moving in a direction orthogonal to at least the axis of the upper connecting pins 16 and 17 at a position spaced apart in the same direction as 21 and 43; 1 Connect between the upper left connecting pin 16 inserted into the upper left first pin insertion hole 12C of the bracket 12 and the hydraulic cylinders 21 and 43 via the floating links 22 and 44. One left link 23, 45, 47, the right upper connecting pin 17 inserted into the right upper first pin insertion hole 13C of the right first bracket 13, and the hydraulic cylinders 21, 43. Is constituted by right links 26, 46 and 48 connected through the floating links 22 and 44,
The lower connection pin attachment mechanism 31, 42,
The hydraulic cylinders 21 and 43 which are elastically disposed at positions separated from the positions of the axes of the lower connecting pins 18 and 19, and the hydraulic cylinders (from the positions of the axes of the lower connecting pins 18 and 19). A floating link 22, 44 arranged in a floating state capable of moving in a direction orthogonal to at least the axis of the lower connecting pins 18, 19 at a position spaced in the same direction as 21, 43; 1 Connect between the lower left connecting pin 18 inserted into the lower left first pin insertion hole 12D of the bracket 12 and the hydraulic cylinders 21 and 43 via the floating links 22 and 44. One left link 23, 45, 47, the right lower connecting pin 19 inserted into the right lower first pin insertion hole 13D of the right first bracket 13, and the hydraulic cylinders 21, 43. Is formed by a right link (26, 46, 48) connected via the floating link (22, 44) between Is a two-member connecting device. The method of claim 4, wherein
The upper connecting pin detachment mechanisms 20 and 41 include the left upper connecting pin 16 and the right first bracket (12C) inserted into the upper left first pin insertion hole 12C of the left first bracket 12 ( The cantilever is supported by the upper right upper connecting pin 17 inserted into the upper right first pin insertion hole 13C of 13),
The lower connection pin attachment / removal mechanisms 31 and 42 include the left lower connection pin 18 and the right first bracket (inserted into the lower left first pin insertion hole 12D of the left first bracket 12). And a cantilever support by the lower right connecting pin (19) inserted into the lower right first pin insertion hole (13D) of the device (13). The method of claim 4, wherein
The hydraulic cylinder 21 of the upper connection pin detachment mechanism 20 is arranged to be stretchable in the same direction as the axis of the upper left connection pin 16 and the upper right connection pin 17,
The left and right links 23 and 26 of the upper connecting pin detachment mechanism 20 connect the hydraulic cylinder 21 and the floating link 22 with respect to the upper connecting pins 16 and 17 of the left and right. Consists of one link each connected,
The hydraulic cylinder 21 of the lower connecting pin detachment mechanism 31 is arranged to be stretchable in the same direction as the axis of the lower left connecting pin 18 and the lower right connecting pin 19,
The left and right links 23 and 26 of the lower connection pin detachment mechanism 31 connect the hydraulic cylinder 21 and the floating link 22 with respect to the left and right lower connection pins 18 and 19. A two-member connecting device, characterized in that formed by one link to connect each. The method of claim 4, wherein
The hydraulic cylinder 43 of the upper connecting pin detachment mechanism 41 is arranged to be stretchable in a direction orthogonal to the axis of the upper left connecting pin 16 and the upper right connecting pin 17,
The floating link 44 is connected to one end of the hydraulic cylinder 43,
The left and right links of the upper connection pin attachment / detachment mechanism 41 are the first and second left and right links 45 and 45 that connect between the left and right upper connection pins 16 and 17 and the floating link 44. 46 and the left and right second links 47 and 48 connecting between the other end of the hydraulic cylinder 43 and the middle portion of the left and right first links 45 and 46. ,
The hydraulic cylinder 43 of the lower connection pin detachment mechanism 42 is arranged to be stretchable in a direction orthogonal to the axis of the lower left connection pin 18 and the right lower connection pin 19,
The floating link 44 is connected to one end of the hydraulic cylinder 43,
The left and right links of the lower connection pin detachment mechanism 42 are connected to the left and right lower connection pins 18 and 19 and the floating link 44, respectively. 46 and the left and right second links 47 and 48 which connect between the other end of the hydraulic cylinder 43 and the middle portion of the left and right first links 45 and 46. Two-member connecting device characterized in that made.

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