JP2000170197A - Front loader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct smoothly operations of fitting a front loader to and removing it from a main machine. SOLUTION: A front loader A is equipped with a pair of right and left working-machine-side hitches, a pair of right and left lift arms 11 of which the base end parts are supported pivotally by the working-machine-side hitches so that they can be raised and lowered, an attachment hitch 12 which is installed horizontally and rotatably between the fore ends of the two lift arms 11 and an attachment which is fitted removably to the attachment hitch 12. Herein the right and left paired working-machine-side hitches are equipped with a pair of right and left fixed-side hitch bodies 20 which are connected fixedly to a main-body-side hitch 10, a fixed-side pivotal support part forming body which is interposed between the two fixed-side hitch forming bodies 20, a movable-side pivotal support part forming body which is fitted to the fixed-side pivotal support part forming body so that it can swing around the longitudinal axis and a pair of right and left movable-side hitch bodies 23 which are fitted to the movable-side pivotal support part forming body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a front loader mounting structure.

[0002]

2. Description of the Related Art Conventionally, as one mode of a mounting structure of a front loader, a hitch is provided on a main unit of the machine, and a hitch of a working machine is provided on a front loader. Some are detachably attachable.

The front loader has a pair of left and right working machine side hitches, a lift arm pivotally supporting a base end of each working machine side hitch to be able to move up and down, and is rotatable between the distal ends of both lift arms. , And a bucket detachably mounted on the attachment hitch.

[0004]

However, when the place where the front loader is to be attached and detached is uneven, or when foreign matter or the like is caught in the lower surface of the attachment, the machine and the front loader take the same posture. In some cases, if the work machine hitch is forcibly connected to the machine side hitch, the machine side hitch may be twisted or snagged. Cannot be linked.

[0005]

Therefore, according to the present invention, the machine is provided with a hitch on the machine side, while the front loader is provided with a hitch on the machine side, and the hitch on the machine side is detachable from the hitch on the machine side. Front loader that can be mounted on
The front loader has a pair of left and right working machine side hitches, a pair of left and right lift arms pivotally supporting the base end of each working machine side hitch and capable of ascending and descending, and a rotatably horizontal side between the distal ends of both lift arms. An attached attachment hitch and an attachment detachably attached to the attachment hitch, the pair of left and right working machine side hitches is a pair of right and left fixed side hitch forming bodies that are fixedly connected to the machine side hitch, A fixed-side pivot portion forming body interposed between both fixed-side hitch forming bodies,
A movable-side pivot supporting body attached to the fixed-side pivot supporting body so as to freely swing around an axis in the front-rear direction, and a pair of left and right movable-side hitch forming bodies attached to the movable-side pivot supporting body. It is intended to provide a front loader characterized by the following.

The present invention also has the following configuration.

The work implement side hitch is provided with a restricting means for restricting the swing angle of the movable hitch forming body.

The work machine side hitch is provided with fixing means for fixing the movable hitch forming body.

In the above-mentioned front loader, the front loader includes a pair of left and right working machine side hitches, a pair of left and right lift arms capable of pivotally supporting the base end of each working machine side hitch and capable of ascending and descending, An attachment hitch rotatably mounted between the tips, and an attachment detachably attached to the attachment hitch, the attachment hitch includes an arm-side hitch forming body attached between the tips of the lift arms, and the arm An attachment-side hitch-forming body attached to the side hitch-forming body so as to freely swing around an axis in the front-rear direction.

[0010] The attachment hitch is provided with a regulating means for regulating a swing angle of the attachment side hitch forming body.

The attachment hitch is provided with fixing means for fixing the attachment-side hitch forming body.

[0012]

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

[0013] That is, the mounting structure of the front loader according to the present invention has a basic structure in which the machine is provided with a hitch on the front side, and the work loader is provided with a hitch on the working machine side. It can be detachably attached to the machine side hitch.

As a characteristic structure, the front loader includes a pair of left and right working machine side hitches, a lift arm pivotally supporting a base end of each working machine side hitch and capable of moving up and down, and front ends of both lift arms. It has an attachment hitch that is rotatably suspended between it and an attachment that is detachably attached to the attachment hitch, and a pair of left and right working machine side hitches is a pair of right and left that are fixedly connected to the machine side hitch. A fixed-side hitch forming body, a fixed-side pivoting part formed between both fixed-side hitch forming bodies, and a movable-side pivoting part mounted on the fixed-side hitch forming body so as to be swingable around an axis in the front-rear direction. And a pair of left and right movable hitch formations attached to the movable side pivot support formation.

In this manner, when the attachment is placed on an irregular ground, or when a foreign substance or the like is caught in the lower surface of the attachment, the movable hitch forming body supporting the lift arm is formed. Although the posture can be freely changed by swinging, the fixed side hitch forming body can easily align the posture with the machine side hitch, and the work of attaching and detaching the front loader from the machine can be performed easily and reliably. .

Further, the work implement side hitch is provided with a restricting means for restricting the swing angle of the movable hitch forming body.

In this way, the attachment and the lift arm are prevented from swinging excessively together,
The device can be prevented from falling.

Further, the work machine side hitch is provided with fixing means for fixing the movable side hitch forming body.

In this way, in the actual work other than the work of attaching and detaching the front loader, by securing the movable hitch to the fixed hitch, it is possible to ensure safety when the lift arm is raised. .

The front loader has a pair of left and right working machine side hitches, a lift arm pivotally supporting a base end of each working machine side hitch to be able to move up and down, and is rotatable between the distal ends of both lift arms. An attachment hitch horizontally mounted on the arm, and an attachment detachably attached to the attachment hitch. The attachment hitch is attached to an arm side hitch forming body attached between the ends of the lift arms, and is attached to the arm side hitch forming body. And a hitch forming body on the attachment side, which is swingably mounted around the axis in the direction.

In this way, when the attachment is placed on an irregular ground, or when a foreign substance or the like is caught in the lower surface of the attachment, the attachment-side hitch forming body that supports the attachment is formed. The posture can be freely changed by swinging, but the arm-side hitch forming body and the lift arm, and the work machine-side hitch can easily align the posture with the machine-side hitch. Can be easily and reliably performed.

Further, when performing a snow removal operation, a grass collection operation, or the like, the attachment can be freely swingable integrally with the attachment-side hitch forming body, so that the attachment can follow the ground or the field. It is possible to secure a good condition and eliminate the occurrence of unprocessed portions.

In addition, the attachment hitch is provided with a restricting means for restricting the swing angle of the hitch forming body on the attachment side.

In this way, the excessive swing of the attachment can be restricted to prevent the machine from tipping over.

Further, the attachment hitch is provided with fixing means for fixing the attachment-side hitch forming body.

In this way, in actual work other than the work of attaching and detaching the front loader, by fixing the attachment to the arm-side hitch forming body, it is possible to ensure safety when the lift arm is raised. .

[0027]

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

A shown in FIG. 1 is a front loader according to the present invention. The front loader A is detachably mounted on a tractor T as the machine.

First, the tractor T will be described. As shown in FIG. 1, the tractor T is provided with a prime mover unit 2 at a front portion of a body frame 1 and an operation unit 3 at a rear portion thereof. Left and right front and rear wheels 4, 4, 5, and 5 are attached to the front and rear sides, respectively.

A pair of right and left hitch stays 6 and 6 are attached to the middle part of the body frame 1, and the hitches 7 and 7 of the machine are respectively attached from the hitch stays 6 and 6 in an upright manner. Between the upper ends of the side hitches 7, 7, a connecting frame 8 of a front gate type is straddled.

As shown in FIGS. 1 and 2, the hitch 7 on the machine side has a hook 7b that is concave downward in the middle of the front side of the hitch body 7a. A boss 7c having a boss hole 7d for inserting a connecting pin is provided with the axis directed in the left-right direction.

Next, the front loader A according to the present invention will be described with reference to FIGS.

That is, the front loader A comprises a pair of left and right working machine hitches 10, 10; a pair of left and right lifting arms 11, 11 pivotally supporting the base ends of the respective working machine hitches 10, 10; Attachment hitch 12 laid between the ends of arms 11, 11, bucket 13 as an attachment detachably attached to attachment hitch 12, and lift arms 11, 11 for lifting and lowering lift arms 11, 11, respectively. 1
1 and lift arm cylinders 14 and 14 interposed between the work machine side hitches 10 and 10 and the left and right sides of the bucket 13 and the lift arms 11 and 1 to rotate the bucket 13.
Bucket cylinders 15 and 15 interposed between
And a stand 16 attached to the distal ends of the lift arms 11, 11. 17 is a bucket link, 18 is a cylinder / rod support, and 19 is an interlocking rod.

The pair of right and left working machine hitches 10, 10 are shown in FIG.
As shown in FIG. 4, a pair of left and right fixed-side hitch forming bodies 20 and 20 fixedly connected to the machine-side hitches 7 and 7 and a fixed side interposed between the two fixed-side hitch forming bodies 20 and 20 are provided. A pivot portion forming body 21, a movable side pivoting portion forming body 22 attached to the fixed side pivoting portion forming body 21 so as to be swingable around an axis in the front-rear direction, and a pair of left and right attached to the movable side pivoting portion forming body 22. And a movable hitch forming member 23.

The fixed-side hitch forming body 20 has an engaging pin 20b provided between the lower portions of a pair of right and left hitch forming pieces 20a, 20a. Positioning engagement pieces 20c, 20c are provided for engaging with the outer peripheral surface of the boss 7c of the machine side hitch 7, and when both engagement pieces 20c, 20c are engaged with the boss 7c, Connection pin holes 20d, 20d corresponding to the boss holes 7d of 7c are formed, and the connection pin 27 is inserted through both holes 7d, 20d, 20d so as to be freely inserted and removed. 28 is a retaining pin inserted through the end of the connecting pin 27, and 29 is a retaining pin retaining piece.

The fixed side pivot portion forming body 21 is a
A left-viewing-portion-shaped forming body 21c is formed from the left and right upright pieces 21a, 21a and the right and left extension pieces 21b laid between the upper ends of the upright pieces 21a, 21a. The hitch forming bodies 20, 20 are respectively attached, and a boss 21d for inserting a swing support shaft is communicated with a central portion of the left-right extending piece 21b so as to communicate with the axis in the front-rear direction. Swing restricting pieces 21e, 21e as swing restricting means protrude forward from the left and right sides, and a boss 21f for inserting a fixing pin is provided on the upper part of the left rising piece 21a so as to communicate with the axis in the front-rear direction. are doing.

The movable side pivot portion forming body 22 is a
22a, 22a and a laterally extending piece 22b extending between upper ends of both rising pieces 22a, 22a to form a forming body body 22c having the same shape as the forming body body 21c of the fixed-side pivot support forming body 21. The swing support shaft 22d is made to protrude rearward from the center of the laterally extending piece 22b, and the swing support shaft 22d is inserted into the boss portion 21d of the fixed-side hitch forming body 20, and the swing support shaft 22d is inserted. The main body 22c can be freely swung around
A boss for fixing pin insertion is provided on the upper part of the left rising piece 22a.
The 21f is connected to the front and rear direction with its axis oriented. 22e
Is a shaft retaining piece and 22g is a retaining bolt.

The swing angle of the body 22c is
Swing restricting piece provided on the fixed side pivot portion forming body 21
21e, the angle before contact with 21e (for example, ± 10 degrees to ± 10 degrees)
15 degrees).

The boss 21f of the fixed-side hitch forming body 20
The boss 22f of the movable hitch forming member 23 is aligned with the boss portion 21f, and the fixing pin 24 is inserted through the boss portions 21f and 22f so as to be freely inserted and removed, thereby forming the fixing means. 23 can be fixed to the fixed-side hitch forming body 20. 25 is a retaining pin.

The movable-side hitch forming body 23 has a pair of left and right hitch forming pieces 23a, 23a connected to the front surfaces of the left and right rising pieces 22a, 22a of the movable-side pivot supporting body 22, respectively. An interlocking rod connecting portion 23b, a lift arm connecting portion 23c, and an arm cylinder connecting portion 23d are provided at the front ends of the hitch forming pieces 23a, 23a at intervals from the upper side to the lower side.

As shown in FIG. 1, the pair of left and right lift arms 11 and 11 are formed by bending a halfway part upward in a convex shape, respectively, and the lift arm connecting portions of the movable hitch forming bodies 23 and 23 are formed. A base end is pivotally connected to and connected to 23c, 23c so as to be vertically rotatable and rotatable. A connecting pipe 26 is suspended between the distal ends of both lift arms 11, 11.

As shown in FIGS. 5 to 7, the attachment hitch 12 includes an arm-side hitch forming body 30 laid between the ends of the lift arms 11, 11, and an axial line extending in the front-rear direction with the arm-side hitch forming body 30. And an attachment-side hitch forming body 31 which is attached so as to freely swing around.

The arm-side hitch forming body 30 is provided on a left and right side of a left and right extension frame 30a extending in the left and right direction, and a pair of left and right connecting pieces 30b, 30b, 30b, 30 extending in the up and down direction, respectively.
b is projected rearward, and between the lower portions of the connecting pieces 30b, 30b, 30b, 30b, the distal ends of the lift arms 11, 11 are pivotally supported by connecting pins 32, 32 whose axes are oriented in the left-right direction. At the same time, one end of the bucket link 17 is connected between the upper portions of the connecting pieces 30b, 30b, 30b, 30b by connecting pins 33
It is pivoted and connected by.

A boss portion 30c for swing shaft insertion is provided at the center of the left and right extension frame 30a so as to communicate with the axis in the front and rear direction, and a fixing pin is provided on the left side of the left and right extension frame 30a. A boss portion 30d for insertion is connected and communicated with the axis line oriented in the front-rear direction.

At the center of the left connecting piece 30b, a swing restricting piece 30e as a swing restricting means is protruded outwardly of a hitch body 31b of an attachment side hitch forming body 31 described later.

The attachment-side hitch forming body 31 is a pair of right and left hitch bodies extending in the vertical direction on the left and right sides of the left and right extending frame 31a extending in the left and right direction.
The connection hooks 31c, 31c are formed at the upper ends of the hitch bodies 31b, 31b, while the connection holes 31d, 31d, 31e, 31e are formed at the lower end of the hitch body 31b. .

A swing support shaft 31f is projected rearward from the center of the left-right extension frame 31a, and the swing support shaft 31f is inserted into the boss portion 30d of the arm-side hitch forming body 30. The attachment-side hitch forming body 31 can be freely swung around the swing support shaft 31f, and a boss portion 31g for inserting a fixing pin is provided on the left side of the left-right extension frame 31a. Has been established. 30f is the shaft retaining piece, 30g is the retaining piece fixing bolt, 34
Is a connecting pipe.

The boss portion of the arm side hitch forming body 30
30d, boss 31g of attachment side hitch forming body 31
The fixing means is formed by freely inserting and removing the fixing pin 35 between the boss portions 30d and 31g, and the attachment side hitch forming body 31 is fixed to the arm side hitch forming body 30 by the fixing means. I can do it. 3
6 is a retaining pin.

The bucket 13 is provided with engaging pins 40, 40 for engaging with the connecting hooks 31c, 31c on the left and right upper portions of the rear wall.
Attaching via brackets 41, 41 with the axis oriented in the left-right direction, and connecting brackets 42, 42
Projecting rearward, and connecting brackets 42, 42
Connection holes 31d, 31d of the attachment side hitch forming body 31
The connecting bolt holes 42a, 42a are formed so that the connecting bolts 43 are screwed into the corresponding holes 31d, 42a.

The swing angle of the bucket 13 is an angle (for example, ± 1) until it comes into contact with the swing restricting piece 30e projecting from the connecting piece 30b of the arm-side hitch forming body 30.
0 degrees to ± 15 degrees).

The attachment other than the bucket 13 can be detachably connected to the attachment-side hitch forming body 31.

FIGS. 8 and 9 show the structure of a connecting pin 32 according to another embodiment.
A detent plate 50 is inserted into the pin insertion holes 51, 51 formed in the b, 30b, and is continuously provided at the base end thereof at right angles to the axis thereof.

On the outer wall of the connecting piece 30b located immediately below the detent plate 50, a detent plate receiver 52 is continuously provided, and the detent plate 50 is mounted on the upper surface of the detent plate receiver 52. Are brought into surface contact with each other to prevent the connection pin 32 from rotating.

Further, in such a state, the detent plate 50
The bolt insertion hole 53 is formed in the
A bolt hole 54 is also formed in the connecting piece 30b in accordance with 53,
A retaining bolt 55 is inserted into both holes 53 and 54, and the tip of the retaining bolt 55 is fixed to the inner surface of the connecting piece 30b.
It is screwed on 56.

Here, a collar 57 is fitted on the outer peripheral surface of the base of the retaining bolt 55, and the bolt insertion hole 53 is formed to have a diameter larger than the outer diameter of the collar 57.

In this manner, even when the rotation stop plate 50 and the rotation stop plate receiver 52 are worn and the backlash of the connecting pin 32 is increased, the rotation stop plate 50 is prevented from interfering with the collar 57. Thus, the retaining bolt 55 is not loosened.

A rubber cushion ring 58 is fitted to the tip of the connecting pin 32, and the cushion ring 58 is fixed by a fixing bolt 60 via a washer 59. 61 is a grease nipple, and 62 is a grease injection passage.

In this way, the cushion ring 58 is pressed against the connecting piece 30b to prevent the connecting pin 32 from rattling in the axial direction.

Also, even when earth and sand collide with the washer 59 and the fixing bolt 60 is loosened, the retaining bolt 55 is
, The connecting pin 32 can be prevented from falling off.

FIGS. 10 and 11 show a grease supply structure as another embodiment, in which a connecting rod connecting portion 23b, a lift arm connecting portion 23c, and an arm cylinder connecting portion 23d provided on the work machine side hitch 10 are provided. In each grease injection path 65,65,65,
A pair of left and right hitch forming pieces 6 forming the work machine side hitch 10
6 and 66, the common grease nipple 67 is connected to the common grease nipple 67 through the communication passages 68, 68, 68 formed in the hitch forming piece 66, and grease is injected from the common grease nipple 67. , Each grease injection passage through each communication passage 68,68,68
Grease can be supplied into 65, 65, 65.

In this way, the grease injection location can be shared, thereby reducing the labor and labor of the grease injection operation, and the grease injection location can be shared.
Grease leakage can also be reduced.

FIG. 12 and FIG. 13 show a hydraulic piping structure as another embodiment, in which forward and backward piping 70 and 71 for the lift arm cylinder are arranged along the outer wall of the lift arm 11.
And the forward / backward piping 72, 73 for the bucket cylinder, and the forward / backward piping 70, 71, 72, 73, and the respective cylinder port portions of the lift arm cylinder 14 and the bucket cylinder 15, They are connected to each other through connection pipes 74, 75, 76, 77.

As the pipes 70 to 77, rigid pipes which are less damaged and deteriorated and have excellent durability, for example, iron pipes, are used, and connection portions 78, 79, 80, 8 of the respective pipes are used.
1 and connecting parts 82, 83, 84, 85 between each cylinder connecting pipe 74, 75, 76, 77 and each cylinder port, and each cylinder connecting pipe 7
Foldable connecting part 86,8 formed in the middle of 4,75,76,77
Swivel joints are set up at 7,88,89 respectively.
Each connecting portion is configured to be rotatable and refuelable.

In this way, a highly durable oil supply pipe structure can be formed.

FIG. 14 shows an oil supply piping structure as another embodiment, in which a connecting shaft 90 between the lift arm 11 and the lift arm cylinder 14 and a connection between the cylinder / rod support 18 and the lift arm 11 are provided. A shaft 91, a connecting shaft 92 for connecting the cylinder / rod support 18 and the bucket cylinder 15, and each cylinder
14,15 cylinder port sections 93,93,94,94 and forward and return pipes 95,95,
96 and 96 piping ports 97 and 98 are formed by swivel joints, and each swivel joint is connected to
Rigid pipes that are less damaged and deteriorated and have excellent durability are used as the connection pipes 100 to 104 and the forward and return pipes 95, 95, 96, 96.

FIG. 15 shows an oil supply piping structure as still another embodiment, which includes forward and backward piping 110 and 111 for a lift arm cylinder and forward and backward piping 112 and 11 for a bucket.
3 flexible cylinder connecting pipes 114,
Connections 118, 119, 120, 121 of 115, 116, 117, cylinder connection pipes 114, 115, 116, 117, and cylinder port sections 122, 123, 12 of lift arm cylinder 14 and bucket cylinder 15
4,125 are each formed by a swivel joint.

In this way, the relative angles between the cylinders 14, 15 and the lift arm 11 and the cylinder connecting pipes 114, 115, 116, 117 can be freely changed, and the flexible cylinder connecting pipes 114, 115, 116, 117 can be naturally bent. Can be made.

Further, each of the pipes 114, 115, 116, 117 can be formed as short as possible, so that interference between the pipes and between each of the pipes and the lift arm 11 is reduced, thereby preventing damage to each of the pipes.

[0069]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the front loader includes a pair of left and right working machine-side hitches, a lift arm pivotally supporting a base end of each of the working machine-side hitches, and a lift arm capable of moving up and down. An attachment hitch that is rotatably mounted between the tips of the work and an attachment that is detachably attached to the attachment hitch. A pair of left and right working machine-side hitches is fixedly connected to the machine-side hitch. A pair of fixed-side hitch forming bodies, a fixed-side pivot supporting body interposed between both fixed-side hitch forming bodies, and a movable side pivot attached to the fixed-side pivot supporting body so as to freely swing around an axis in the front-rear direction. Because it has a base forming body and a pair of left and right movable hitch forming bodies attached to the same movable side pivot forming body, when the attachment is placed on uneven ground, or on the lower surface of the attachment If a foreign object or the like is caught, the movable hitch forming body supporting the lift arm swings and freely changes the posture. The alignment can be performed, and the work of attaching and detaching the front loader from the main unit can be performed easily and reliably.

According to the second aspect of the present invention, since the work implement side hitch is provided with the restricting means for restricting the swing angle of the movable hitch forming body, the attachment and the lift arm are integrally excessively formed. The swing can be restricted to prevent the machine from falling down.

According to the third aspect of the present invention, the work implement side hitch is provided with fixing means for fixing the movable side hitch forming body. By fixing the side hitch to the fixed side hitch, it is possible to ensure safety when the lift arm is raised.

According to the fourth aspect of the present invention, the front loader includes a pair of left and right working machine side hitches, a lift arm pivotally supporting a base end of each of the working machine side hitches, and a lift arm capable of moving up and down. An attachment hitch rotatably mounted between the ends of the lift arm, and an attachment detachably attached to the attachment hitch. The attachment hitch includes an arm-side hitch forming body attached between the ends of the lift arms, and Since the attachment-side hitch-forming body is attached to the arm-side hitch-forming body so as to swing freely around the axis in the front-rear direction, the attachment may be placed on uneven ground, or foreign matter may be present on the underside of the attachment. If it is caught, the attachment-side hitch forming body that supports the attachment swings and freely However, the arm-side hitch forming body, the lift arm, and the work machine-side hitch can be easily aligned with the machine-side hitch, making it easy and reliable to attach and detach the front loader from the machine. Can be done.

Further, when performing a snow removal operation, a grass collection operation, or the like, the attachment can be freely swingable integrally with the attachment side hitch forming body, so that the attachment can follow the ground or the field. It is possible to secure a good condition and eliminate the occurrence of unprocessed portions.

According to the fifth aspect of the present invention, since the attachment hitch is provided with the regulating means for regulating the swing angle of the attachment-side hitch forming body, excessive swing of the attachment is regulated, and Falling can be prevented.

According to the sixth aspect of the present invention, since the attachment hitch is provided with fixing means for fixing the attachment-side hitch forming body, the attachment can be moved to the arm side during actual work other than the work of attaching and detaching the front loader. By fixing the lift arm to the hitch forming body, it is possible to ensure safety when the lift arm is raised.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor equipped with a front loader according to the present invention.

FIG. 2 is a side view of a work machine side hitch.

FIG. 3 is a plan view of the work machine side hitch.

FIG. 4 is a sectional rear view of the work machine side hitch.

FIG. 5 is a side view of the attachment hitch.

FIG. 6 is a plan view of the attachment hitch.

FIG. 7 is a sectional rear view of the attachment hitch.

FIG. 8 is a side view of an attachment hitch having a connecting pin as another embodiment.

FIG. 9 is a sectional view taken along line II of FIG. 8;

FIG. 10 is a side view showing a grease supply structure as another embodiment.

FIG. 11 is a sectional view of the grease supply structure.

FIG. 12 is a side view showing a hydraulic piping structure as another embodiment.

FIG. 13 is a sectional view taken along the line II-II of FIG. 12;

FIG. 14 is a side view showing an oil supply piping structure as another embodiment.

FIG. 15 is a side view showing an oil supply piping structure as still another embodiment.

[Explanation of symbols]

 A front loader T tractor 1 body frame 2 motor unit 3 operation unit 4 front wheel 5 rear wheel

Claims (6)

[Claims] 1. A front loader in which a hitch is provided on the machine, a hitch is provided on the front loader, and the hitch on the work machine is detachably attachable to the hitch on the machine. The loader includes a pair of left and right working machine side hitches, a pair of left and right lift arms pivotally supporting a base end of each working machine side hitch, and a pair of left and right lift arms. And a pair of left and right working machine side hitches, and a pair of right and left fixed side hitch forming bodies that are fixedly connected to the machine side hitch. A fixed-side pivot member formed between the fixed-side hitch-formed members, a movable-side pivot member formed on the fixed-side pivot member to be swingable around an axis in the front-rear direction, and a movable-side pivot member Front loader characterized by comprising a pair of right and left movable hitch formed body attached to the adult. 2. The front loader according to claim 1, wherein the work implement side hitch is provided with a restricting means for restricting a swing angle of the movable side hitch forming body. 3. The front loader according to claim 2, wherein the work implement side hitch is provided with fixing means for fixing the movable side hitch forming body. 4. A front loader in which a hitch is provided on the machine and a hitch is provided on the front loader, and the hitch on the work machine is detachably attachable to the hitch on the machine. The loader includes a pair of left and right working machine side hitches, a pair of left and right lift arms pivotally supporting a base end of each working machine side hitch, and a pair of left and right lift arms. An attachment hitch, and an attachment detachably attached to the attachment hitch. The attachment hitch includes an arm-side hitch forming body attached between the ends of the lift arm, and an axial line extending in the front-rear direction on the arm-side hitch forming body. A hitch forming body attached to the attachment so as to freely swing around the front loader. 5. The front loader according to claim 4, wherein the attachment hitch is provided with a restricting means for restricting a swing angle of the attachment-side hitch forming body. 6. The front loader according to claim 4, wherein the attachment hitch is provided with fixing means for fixing the attachment-side hitch forming body.