JPH099713A - Linking device for working machine - Google Patents

Abstract

PURPOSE: To provide a linking device for a working machine aiming at the compactness of a linked part at the front of the working machine and capable of regulating the position of an extending direction of the linked part at a prescribed position. CONSTITUTION: This linking device for a working machine is constituted by equipping a linking part 17 in a tractor, and a linked part 42 having a pair of rocking members 43 pivoted to the supporting plate 39 as freely rockable and capable of freely openable and closable in an opposing direction, an energizing member 48 energizing a pair of the rocking members in an extending direction, a stopper 45 regulating their positions in the extending direction and a locking means 53 keeping the closed state on closing a pair of the rocking members 43 in the working machine, spanning the energizing means 48 across the side surface of the pair of rocking members 43, arranging the stopper 45 between a pair of the rocking members 43 and fixing it to the supporting plate 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine mounting apparatus for mounting a working machine such as a backhoe to a tractor.

[0002]

2. Description of the Related Art A conventional connecting device for a working machine is provided with a connecting part at the rear part of a tractor and swings on a supporting plate at the front part of the working machine, as described in Japanese Patent Laid-Open No. 6-264465. A pair of upper and lower swing members that are freely pivotally supported and can be opened and closed in opposite directions, a biasing means that biases the pair of swing members in the expansion direction, and a stopper that regulates the position in the expansion direction. A connecting part having a locking means for holding the closed state when the pair of rocking members are closed, the connecting part being disposed between the pair of rocking members, Closed,
There is one in which the connecting portion and the connected portion are connected by holding the closed state by the locking means.

The urging means comprises tension springs vertically extending between a hooking piece projecting from the upper and lower ends of a pair of upper and lower swing members and a support plate pivotally supporting the swing members. The stopper is provided with an urging means for urging in the expanding direction, and the stopper forms a restricting surface on the opposing surfaces of the pair of swinging members, and the upper and lower restricting surfaces contact each other to restrict the expanding position. It is used as a stopper.

[0004]

In the coupling device for a working machine described above, since the urging means is located outward in the vertical direction from the upper and lower ends of the swinging member, there is no space for installing the urging means. If necessary, the connected part becomes large and hinders the downsizing of the working machine.Especially for the upper urging means, the operation of the working machine behind the connected part with the tractor and the working machine connected. If there are steps for personnel,
The space underneath was narrowed, which was a hindrance to getting on and off. Further, since the urging means are required at two positions above and below the swinging member, the number of parts increases, which causes a cost increase.

With regard to the stopper, since the restriction surfaces provided on the opposing surfaces of the pair of rocking members serve as stoppers, it is possible to make the device compact, but each restriction surface is accompanied by the rotation of the rocking member. It is difficult to bring the facing restriction surfaces into contact with each other at a regular position, and it is therefore difficult to always position the pair of rocking members in the expansion direction at a fixed position. As a result, the relative positions of the expanding portions of the pair of swinging members and the connecting portion are changed, and the connecting portion and the connected portion are connected,
That is, there is a possibility that the connection between the tractor and the working machine may be hindered.

In view of the above, the present invention aims at downsizing and cost reduction of the connected portion, and also restricts the restricting position of the connected portion in the expanding direction to a constant position to ensure the connection between the tractor and the working machine. It is an object of the present invention to provide a connecting device for a working machine that can be used in the above.

[0007]

According to the present invention, one of the tractor 1 and the working machine 7 is provided with a connecting portion 17 and the other is provided with a connected portion 42, and the connected portion 42 is provided with a support plate 39. A pair of rocking members 43 that are pivotally supported in a swingable manner to open and close in opposite directions, a biasing means 48 that biases the pair of rocking members 43 in the expanding direction, and a position in the expanding direction. It has a stopper 45 for regulating and a lock means 53 for holding this closed state when the pair of swinging members 43 are closed, and the connecting portion 17 is arranged between the pair of swinging members 43. In order to achieve the above-mentioned object, in the connecting device of the working machine, which connects the connecting portion 17 and the connected portion 42 by closing the pair of swinging members 43 and maintaining the closed state by the locking means 53, Are taking technical measures.

That is, the urging means 48 is provided by bridging the side surfaces of the pair of rocking members 43. The stopper 45 is arranged between the pair of swinging members 43 so that the facing surfaces of the pair of swinging members 43 come into contact with each other, and is fixed to the support plate 39.

[0009]

The urging means 48 for urging the pair of swinging members 43 of the connected portion 42 provided on either the tractor 1 or the working machine 7 in the expanding direction is provided on the side surface of the pair of swinging members 43. Since the urging means 48 is provided over the swing member 4,
It is possible to make the connected portion 42 compact by being accommodated within the area of the side surface of the tractor 1.
Even when there is a driver's step or the like behind the connected portion 42 in a state where the working machine 7 is connected, there is no problem in getting on and off the vehicle. Further, since the urging means 48 is bridged between the pair of swinging members 43, only one urging means 48 can be provided, and the number of parts can be reduced and the cost can be reduced.

Further, since the stopper 45 is arranged between the pair of swinging members 43 so as to abut against the facing surfaces of the pair of swinging members 43, and is fixed to the support plate 39,
While achieving compactness, the stopper 45 fixed to the support plate 39 is brought into contact with the facing surfaces of the pair of swinging members 43 to keep the position regulation in the spreading direction constant, thereby expanding the swinging member 43. Since the relative position between the open portion and the connecting portion 17 is also constant, the work machine 7 can be reliably attached to the tractor 1.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 5, reference numeral 1 denotes a tractor, which has a vehicle body 8 including an engine and a transmission case, a front wheel 2 provided at a front portion of the vehicle body 8, a rear wheel 3 provided at a rear portion thereof, and the like.
A hydraulic device 9 for raising and lowering the working machine and a floor sheet 10 covering the upper part of the hydraulic device 9 are provided on the upper rear part.
A seat 5 is provided on an upper portion of the floor seat 10 so as to be reversible between a frontward posture and a rearward posture via a reversing support device 65, and a handle 4 is provided at a front portion of the seat 5. A front loader 6 is detachably attached to the front portion of the tractor 1 and a backhoe (working machine) 7 is detachably attached to the rear portion.

A mounting frame 13 used for mounting the working machine 7 is provided at the bottom of the vehicle body 8.
Reference numeral 3 denotes a main frame member 14 provided on both left and right lower portions of the vehicle body 8 in the front-rear direction, an outer frame member 15 provided on the outer side in the left-right direction of the main frame member 14 so as to project upward, and an inner frame member inside the outer frame member 15. The inner frame member 16 and the like are provided, and the mounting frame 13 is connected to the rear axle case 11 of the rear wheel 3 via the bracket 12.

A receiving member 18 is fixed to the inside of the lower rear portion of the outer frame member 15 in the left-right direction so as to project rearward from the vehicle body 8. The receiving member 18 is formed with an upwardly opening concave portion 19, This is connected to a connecting bar 40 described later. A mount bar (connecting portion) 17 having a horizontal axis is arranged above the receiving member 18, and the mount bar 17 is fixed between the outer frame member 15 and the inner frame member 16. ing.

As shown in FIG. 6, the machine frame 2 of the backhoe 7
2 includes a pair of upper and lower main frame members 23, a front frame member 24 that connects the front end members of the upper and lower main frame members 23, an intermediate frame member 25 that connects the middle parts of the upper and lower main frame members 23, and the like. Become. A swivel frame 26 is attached to the rear ends of the upper and lower main frame members 23 so as to be swingable right and left around a vertical axis, and is swivelable by a pair of left and right swivel cylinders 27. A base of a boom 28 is provided below the swivel frame 26. Is pivotally attached and can be vertically swung by a boom cylinder 29. A base of an arm 31 that is rotated by an arm cylinder 30 is pivotally attached to the tip of the boom 28, and a bucket 33 is pivotally supported by the tip of the arm 31, and the bucket cylinder 32 swings through a link mechanism. To be done.

A step 37 is provided above the machine frame 22, and a control box 38 is provided on the step 37.
Is installed. Also, on the left and right sides of the machine frame 22,
A stabilizer 35 is provided via a bracket 34 so as to be vertically swingable by a swing cylinder 36. Machine frame 22
Support plates 39 are fixed to the left and right sides of the front part of the connecting bar 4, and the lower part of the support plate 39 has a connecting bar 4 having a horizontal axis.
0 is provided, and both left and right ends of the connecting bar 40 are projected outward in the left and right direction from the support plate 39, and a guide plate 51 is fixed to the outer side of the lower end of the support plate 39 in the left and right direction. The plate 51 has a guide portion 51a whose lower end is inclined inward in the left-right direction.

Above the connecting bar 40 of each supporting plate 39 and on the outer side surface in the left-right direction, a connected portion 42 having a pair of vertically mounted mount holders (oscillating members) 43 is arranged. . The connected portion 42 is pivotally supported by a support plate 39 so as to be openable and closable in opposite directions, and the pair of upper and lower mount holders 43 and the pair of mount holders 43.
Urging means 48 for urging the expansion holder in the expanding direction, a stopper 45 for restricting the position in the expanding direction, and a pair of mount holders 4
Locking means 5 for holding this closed state when 3 is closed
And 3.

The pair of upper and lower mount holders 43 is the support plate 3
Upper and lower support shafts 41 having an axial center in the left-right direction on the outer surface of 9
It is pivotally supported by a and 41b, and is opened and closed by swinging in the opposite direction. The support shaft 41a that supports the upper mount holder 43 is provided across the left and right support plates 39, and the support shaft 41b that supports the lower mount holder 43 is provided separately for the left and right sides. The upper and lower support shafts 4 are provided on the outer surface side of the pair of upper and lower mount holders 43.
A pressing plate 46 fixed by bolts 46a is provided at the outer ends of 1a and 41b.

The urging means 48 is composed of a tension spring or the like, and is bridged between the lateral outer surfaces of the pair of mount holders 43. This urging means 48 is provided on the upper and lower support shafts 4.
1a and 41b, the pair of mount holders 43 are connected by being hooked by hooking projections 49 protruding outward from the respective lateral outer surfaces of the pair of mount holders 43. 48 act to pull each other, and urge the mount holder 43 to expand toward the tractor 1 side (front). Therefore, the urging means 48 fits within the area of the side surface of the mount holder 43, and the connected portion 42 is made compact. Further, since the urging means 48 is bridged between the pair of swinging members 43, only one urging means 48 can be provided, and the number of parts can be reduced and the cost can be reduced.

Further, the mount holder 43 and the support plate 39
Also, since the support plate 39 and the pressing plate 46 are engaged only via the support shafts 41a and 41b, the outer shapes of the support plate 39 and the pressing plate 46 can be reduced in accordance with the outer shape of the mount holder 43. The pressing plate 46 is provided with an arc-shaped long hole 47 through which a hooking protrusion 49 that moves with the rotation of the upper and lower mount holders 43 is inserted.

On the opposing surfaces of the pair of mount holders 43,
An arcuate recess 44 that fits into the mount bar 17 provided on the mounting frame 9 on the tractor 1 side is formed, and the recess 4 is formed.
The rear of 4 is notched, and an open engagement recess 50 is formed toward the rear. Further, when the pair of mount holders 43 are expanded, the stopper 45 with which the engaging concave portion 50 abuts is arranged between the pair of mount holders 43. The stopper 45 is formed in a rod shape and is fixed so as to project inward in the left-right direction from the inner side surface of the pressing plate 46, and thus is fixed to the support plate 39.

The supporting plate 39 and the pressing plate 46 on the side of the recess 44 are U-shaped so as not to interfere with the mount bar 17 when the mount holder 43 and the mount bar 17 are connected to each other. It is cut out. The locking means 53 is arranged behind the mount holder 43, and restricts the expansion of the mount holder 43 when it is closed, that is, maintains the closed state. The locking means 53 includes a lock member 54 having a head portion 54a fitted into the engagement recess 50 and a shaft portion 54b having a front portion fixed to the outer side of the head portion 54a in the left-right direction, and the lock member 54. Mount holder 43
It has an operation unit 55 for performing an advance / retreat operation with respect to

The operating portion 55 has a support shaft 56 protruding laterally outward from the outer surface of the support plate 39, an operation lever 57 rotatably supported by the support shaft 56, and the operation lever 5.
7 has an arm 58 that rotates together with the pin 7, and is connected to a pin 62 provided on the front portion of the shaft portion 54a of the lock member 54.
The rear part of b is axially slidably supported by a support plate 59 fixed to the main frame member 23 on the upper side of the machine frame 22, and a compression spring 64 is provided between the support plate 59 and the pin 62.
Has been overfitted.

On the rear surface of the support plate 59, a positioning member 63 having a notched concave portion 63a whose upper portion is open is fixed. Two holes 60 and 61 are formed in the shaft portion 54b in the axial front and rear direction, the rear hole 61 is made to face the notch recess 63a of the positioning member 63, and the locking pin 52 is inserted into the hole 60 and notched. By locking in the recess 63a, the lock member 54 is held in the lock position, and the locking pin 52 is inserted so that the front hole 60 faces the notch recess 63a.
By locking, the lock member 54 is held at the retracted position. The rear portion of the pressing plate 46 has a lock member 5
The front portion of the shaft portion 54b of No. 4 is notched in a U shape so as not to interfere.

As shown in FIGS. 5 and 7, the seat 5 of the tractor 1 is used in a forward posture A used when the tractor travels on the road and when the front loader 6 works, and when the backhoe 7 works. Backward posture B
The posture can be changed by the reversing support device 65. As shown in FIG. 7, reference numeral 70 denotes a fixed base that is mounted on the floor sheet 10 side of the vehicle body 2. A pair of left and right side wall plates 67 are erected on a mounting plate 66, and a front side wall is provided at a front portion of the mounting plate 66. A plate 68 is erected, and the rear ends of the left and right side wall plates 67 are connected by a connecting plate 69.

The right and left side wall plates 67 of the fixed base 70 support the lower ends of a pair of front and rear parallel links 71. Lower ends of the front-rear parallel links 71F, 71R are pivotally connected to front-rear horizontal shafts 72F, 72R provided on the fixed base 70, and can swing from a front upward tilt state to a rear upward tilt state. The rear parallel link 71R in the rear upward tilted state is received by coming into contact with the connecting plate 69 of the fixed base 70.

The front and rear parallel links 71F and 71R are each formed of two right and left, and front and rear parallel links 71F and 71R.
A support base 73 is connected to each upper end of R via front and rear support shafts 74F and 74R. And the rear parallel link 71R
Has an arm 75 protruding downward from the lower end, and a rod 76 is fixed between the left and right arms 75.
And the front horizontal shaft 72F, the tension spring 86 is stretched.

When the rear parallel link 71R swings, the rod 23 crosses the center lines of the front and rear horizontal shafts 4F, 4R, and the parallel springs 71F, 71R are moved by the tension spring 86.
Is always biased in the standing direction (upward at the top). 7
Reference numeral 7 is a swivel base, which is mounted on the support base 73 so as to be rotatable about a central vertical axis 78, and is provided with a lock pin 8 provided on the support base 73.
7 is releasably locked in two front and rear locking holes 89 provided on the swivel base 77, and is locked in either one of the front and rear locking holes 89, whereby a forward posture A and a backward posture B are obtained. Is set to.

A pair of left and right guide rails 80 are fixed on the swivel base 77, and the sliding plate 7 is attached to the left and right guide rails 80.
9 is provided so as to be slidable forward and backward, and the sliding plate 79 can be fixed at a position where it is slid by forward and backward positioning means (not shown). A front portion of the seat 5 is pivotally connected to the front portion of the sliding plate 79 via a pivot 81, and a cushion 82 for receiving the rear portion of the seat 5 is provided at the rear portion of the sliding plate 79. By rotating the seat 5 around the pivot 81, the swivel base 77 can be exposed.

Near the lower end of the rear parallel link 71R,
A locking body 84 that engages with an end of a rod 76 provided on an arm 75 that swings integrally with the locking body 84 is provided, and the locking body 84 is swingably supported around a support pin 85 provided on the fixed base 70. There is. The locking body 84 has a bell crank shape and has a recess 84.
It has a front contact portion 84a and a rear contact portion 84b which are divided into two upper and lower parts via a c, and the front and rear contact portions 84a, 84b.
The branch point of the is supported by the support pin 85.

When the rear parallel link 71R faces forward and upward, the front contact portion 84a engages with the end of the rod 76, and when the rear parallel link 71R faces upward and rear, the rear contact portion 84b engages with the end of the rod 76. Thus, the upward swing of the parallel link 71 is restricted, and the seat 5 is restricted from rising above the set height. In addition, at the lower part of the locking body 84, the locking body 8
An operating member 83 for swinging 4 to engage and disengage from the end of the rod 76 is provided via a pin 93.
A position that is supported by the front side wall plate 68 of the fixed base 70 so as to be slidable in the front-rear direction, and that the front contact portion 84a or the rear contact portion 84b of the locking body 84 is engaged with the end portion of the rod 76 by the spring 83a. Is urged to become. Further, a cushion means 94 made of a spring, a rubber body or the like is provided on the lower front portion of the support base 73 to set a lowering limit when the parallel link 71 is directed forward and upward.

The lock pin 87 is urged downward on the lower surface of the support base 73 via a compression spring 88, and contacts the lower end of the lock pin 87 at the center of the front support shaft 74F in the left-right direction. Lock pin 8 between swivel base 77 and support base 73
A cam 90 that engages and disengages the engagement by the gear 7 is provided. As shown in FIGS. 8 and 9, the cam 90 has a side view arcuate portion and a planar portion, and the arcuate portion has a lock pin when the parallel link 71 is in a front upward direction and a rear upward direction. 87 becomes a lock surface 91 that pushes up 87 and engages with the locking hole 89 of the swivel 77, and the flat portion pushes the lock pin 87 downward by the compression spring 88 when the parallel link 71 is in the upright state. It is a lock release surface 92 that is disengaged from the locking hole 89. The lock release surface 92 is formed in a substantially flat surface perpendicular to the longitudinal direction of the front parallel link 71F.

With the construction as described above, the backhoe 7 is attached to the tractor 1, and the seat 5 is changed from the frontward posture A to the rearward posture B (see FIG. 7) so that the backhoe 7 can be operated. The operation up to is explained. First, in a state where the backhoe 7 is separated from the tractor 1, as shown in FIG.
In addition, the lock member 54 removes the locking pin 52 to release the holding by the positioning member 63 before the backhoe 7 is mounted on the tractor 1, and the head 54a thereof is mounted on the mount holder. 43 is abutted on the rear surface. Then, the backhoe 7 holds the left and right stabilizers 35 and the bucket 33 in a grounded state.

To mount the backhoe 7 on the tractor 1, the connecting bar 40 is arranged above the receiving member 18 by operating the stabilizer 35, the boom 28, etc., and the stabilizer 35 is raised to move the backhoe 7. The connection bar 40 is lowered and fitted into the recess 19 of the receiving member 18 from above. Then, the connecting bar 40 is connected to the receiving member 18 so as to be rotatable around the axis in the left-right direction.

At this time, the mount bar 17 is positioned in front of the mount holder 43, but the pair of mount holders 43 are pulled apart from each other by the biasing means 48 to expand, and their opposing surfaces are supported. Since it is in contact with the stopper 45 fixed to the plate 39, the position of the expanded portion is always constant, and therefore the relative position with respect to the mount bar 17 is also always constant so that the mounting can be surely performed.

Next, the arm cylinder 30 or the bucket cylinder 32 is operated to rotate the machine frame 22 of the backhoe 7 around the connecting bar 40 to bring the mount holder 43 close to the tractor 1 side. The mount bar 17 is shown in FIG.
As shown in FIG. 4A, it is inserted and arranged between the mount holders 43, and the rear end of the arc-shaped recess 44 is pressed by the mount bar 17, so that as shown in FIG.
The mount holder 43 is closed against the biasing means 48, and the mount bar 17 is sandwiched between the pair of mount holders 43.

At this time, with the closing operation of the mount holder 43, the engaging recess 50 expands, and the head portion 54a of the lock member 54 is biased by the compression spring 64, so that the engaging recess 5 moves.
0, the head 54 is inserted into and sandwiched between the mount holders 43, and the biasing means 48 of the mount holder 43 is inserted.
The opening operation due to is blocked. In this state, the notch concave portion 63a of the positioning member 63 and the hole 61 on the rear side of the locking means 53.
Match, the locking pin 52 is inserted and locked, and the locking means 5
By holding 3 in the locked position, mount bar 1
The mount holder 43 is connected to 7, that is, the machine frame 22 of the backhoe 7 is connected and fixed to the mounting frame 9, and the backhoe 7 is mounted on the tractor 1.

As described above, the backhoe 7 is attached to the tractor 1
In the state in which the backhoe 7 is mounted on the backhoe 7, the step 37 of the backhoe 7 is located behind the connected portion 42, but there is nothing protruding above the connected portion 42. It can be secured and there is no hindrance to getting on and off. Next, the operation of reversing the seat 5 by the reversing support device 65 will be described. First, when the seat 5 is in the forward posture A state, the end of the rod 76 between the left and right arms 75 provided at the lower end of the rear parallel link 71R is Locking body 84
The upward swing of the parallel link 71 is regulated by abutting the front abutting portion 84a, and the lower side is elastically supported by the tension spring 86 and the cushion means 94.
In addition, the lock surface 91 of the cam 90 provided on the front support shaft 74F
Locks the swivel 77 by pushing up the lock pin 87,
The seat 5 is maintained in the forward facing posture A.

Then, the operating member 83 is pulled forward to separate the front contact portion 84a of the locking body 84 from the end portion of the rod 76. Then, the parallel links 71F and 71R stand up by the tension spring 86, and when the seat 5 reaches the uppermost position (the tension spring 86 is in the neutral state), the support base 73 is provided.
The lower end of the lock pin 87 of is the unlocking surface 92 of the cam 90.
And the locked state of the swivel base 77 is automatically released.

Then, after the seat 5 is turned 180 degrees to be turned rearward, the parallel links 71F and 71R are rocked against the tension spring 86 until they come into contact with the connecting plate 69 and are tilted rearward upward. By this swinging, the lower end of the lock pin 87 moves from the lock release surface 92 of the cam 90 to the lock surface 91, and is automatically pushed up to engage with the locking hole 89 on the rear side of the swivel base. Then, the rear contact portion 84b of the locking body 84 contacts the end portion of the rod 76 and prevents the seat 5 from rising.

In this way, the lock pin 87 can be automatically locked and unlocked by swinging the parallel link 71 back and forth. For example, the lock pin 87 can be manually locked with the seat 5 at the uppermost position. It is possible to smoothly invert the seat 5 without requiring work such as releasing. In addition, in order to detach the backhoe 7 from the mounted state,
By pulling out the locking pin 52 and moving the operation lever 57 backward, the lock member 54 is moved backward, the head portion 54a is disengaged from the engaging recess 50, and the retracted position is held. Then, in this state, the operation reverse to the above is performed. Further, the seat 9 is moved from the rearward posture B to the forward posture A.
In the case of changing the posture, the operation member 83 may be pushed backward to disengage the rear contact portion 84b of the locking body 84 from the end portion of the rod 76, and the operation opposite to the above may be performed.

The present invention is not limited to the above-mentioned embodiment, and the design can be changed as appropriate. For example, the connected portion 42 on the tractor 1 side.
Can be provided with the connecting portion 17 on the working machine 7 side, and the stopper 45 of the mount holder 43 can be held by the pressing plate 4.
The protrusions may be provided outward in the left-right direction on the support plate 39 side instead of the 6 side. Further, the reversing support device 65 for the seat 5
The cam 90 of the rear support shaft 74R instead of the front support shaft 74F.
The lock pin 87 may be provided on the rear portion of the support base 73.

[0042]

The urging means for urging the pair of oscillating members of the connected portion provided on either the tractor or the working machine in the expanding direction is provided on the side surfaces of the pair of oscillating members. Since the urging means is provided, the urging means can be housed within the area of the side surfaces of the pair of swinging members, and the connected portion can be made compact. Even if there is a driver's step behind the connecting portion, there is no problem in getting on and off. Further, since the biasing means is bridged between the pair of swinging members, only one biasing means can be provided, and the number of parts can be reduced and the cost can be reduced.

Further, since the stopper is arranged between the pair of swinging members so as to abut against the facing surfaces of the pair of swinging members and is fixed to the supporting plate, it is possible to make the device compact and compact. The opposing faces of the pair of swinging members abut on the stopper fixed to the support plate to keep the position of the swinging member in the expanding direction constant, and thus the relative position between the expanding portion of the swinging member and the connecting portion is also fixed. Therefore, the work machine can be reliably attached to the tractor.

[Brief description of drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention and is a view taken along the line CC in FIG.

FIG. 3 is a sectional view taken along the line DD in FIG. 1, showing an embodiment of the present invention.

FIG. 4 shows an embodiment of the present invention, in which (a) is an operation view showing a state where the swinging member is expanded and (b) is a state where the swinging member is closed and connected to the connecting portion.

FIG. 5 is an overall configuration diagram of an embodiment of the present invention.

FIG. 6 is a partial side cross-sectional view showing the configuration of the working machine according to the embodiment of the present invention.

FIG. 7 is a partial side sectional view showing the configuration of the reversing support device according to the embodiment of the present invention.

FIG. 8 is a side sectional view showing an upper portion of the inversion support device according to the embodiment of the present invention.

9 is a cross-sectional view taken along line EE of FIG. 8 showing an embodiment of the present invention.

[Explanation of symbols]

 1 tractor 7 working machine (backhoe) 17 connecting part (mount bar) 42 connected part 43 swinging member (mount holder) 45 stopper 48 urging means 53 locking means

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[Procedure amendment]

[Submission date] July 5, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction contents]

Next, the machine frame 22 of the backhoe 7 is rotated around the connecting bar 40 to bring the mount holder 43 close to the tractor 1 side. The mount bar 17 is shown in FIG.
4B, the mount bar 17 is inserted and arranged between the mount holders 43, and the mount bar 17 presses the rear end of the arc-shaped recess 44, so that the mount holders 43 are biased as shown in FIG. 4B. The mount bar 17 is closed against the means 48, and the mount bar 17 is sandwiched between the pair of mount holders 43.

Claims (2)

[Claims] 1. A connecting portion (17) is provided on one of the tractor (1) and the working machine (7), and a connected portion (4) is provided on the other.
2), the connected portion (42) is pivotally supported by the support plate (39) so as to be pivotable and can be opened and closed in opposite directions, and the pair of pivot members. A biasing means (48) for biasing the member (43) in the expanding direction, a stopper (45) for restricting the position in the expanding direction, and a pair of swinging members (43).
Locking means (5) for holding this closed state when the
3), the connecting portion (17) is disposed between the pair of rocking members (43) to close the pair of rocking members (43), and is closed by the locking means (53). In a coupling device for a working machine, which is configured to connect a connecting part (17) and a connected part (42) by holding the pair of swinging members (43),
A connecting device for a working machine, which is provided by bridging the side surface of the work machine. 2. The stopper (45) is arranged between the pair of swinging members (43) so that the facing surfaces of the pair of swinging members (43) come into contact with each other, and the support plate (39). The connection device for a working machine according to claim 1, wherein the connection device is fixed to the connection device.