JP3361033B2 - Loader working machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loader working machine such as a front loader mounted on a front portion of a tractor.

[0002]

2. Description of the Related Art Conventionally, as a loader working machine mounted on the front part of a tractor, there is one disclosed in JP-A-7-207695. This consists of a pair of left and right side frames that are detachably attached to frame mounts provided on the left and right sides of the front part of the tractor, and are pivotally attached to the side frames on the left and right sides of the hood of the tractor so that they can swing up and down. It is mainly composed of a pair of left and right booms and a bucket attached to the tip ends of the left and right booms.

In this loader working machine, in order to facilitate the attachment / detachment to / from the tractor, the side frame is provided with a concave portion which fits into the receiving portion provided on the frame mounting base from above, and the frame mounting base and the side frame. A connecting pin that connects the frame and a receiving part that receives the tip of the brace that connects the side frame to the front end of the tractor are provided on the tractor.Remove the connecting pin and release the connection between the brace and the front end of the tractor. Then, with the bucket in contact with the ground, by extending the boom cylinder that swings the boom up and down, the side frame is disengaged upward from the frame mount with the abutting part between the tip of the brace and the receiving part as a fulcrum. I am trying.

After that, the tractor is retracted, and a pair of stand members for supporting the boom with the bucket grounded are provided so that the loader working machine does not fall at this time. It is attached to each of the left and right side frames when retracting.

[0005]

In the above loader working machine, the stand member is attached to the outer surface of the side frame in the left-right direction when it is detached from the tractor, so that the stand member is firmly formed. However, if the mounting part is not strong, the load from the boom cannot be fully received, and it is troublesome to mount and dismount one by one, especially as the loader working machine becomes larger, The stand member is also large and difficult to handle.

Therefore, in order to facilitate the handling of the stand member, the stand member is rotatably supported by the boom, and the use posture is such that the stand member is projected from the boom to the rear side and is grounded. By rotating the member upward, the posture can be changed to a non-use posture along the boom, and in the use posture, the part of the stand member opposite to the grounding part is brought into contact with the rear surface of the boom. Therefore, it is considered that the stand member can sufficiently receive the load from the boom. However, if the portion of the stand member opposite to the grounding part is brought into contact with the back surface of the boom, the stand member cannot be rotated along the boom and cannot be stored in the non-use posture. Occurs.

Further, since the conventional stand member is attached to the side frame, the stand member is located on the rear side of the front wheel of the tractor when the stand member is attached. In order to prevent the front wheel from interfering with the stand member, the left-right distance of the stand member must be made larger than the tread of the front wheel, and the left-right distance of the stand member (left-right width when the loader working machine is detached) becomes large. There are also problems. In view of the above-mentioned problems, the present invention makes it possible to bring the side of the stand member opposite to the grounding part into contact with the back surface of the boom to sufficiently receive the load from the boom, and to rotate the stand member. The main object of the present invention is to provide a loader work machine in which the posture can be changed from a use posture in which it is projected from the boom and grounded to a non-use posture along the boom.

[0008]

The technical means taken by the present invention to achieve the above-mentioned object are a boom 11, a work tool 13 provided on the tip side of the boom 11, and the work tool 1.
In a loader working machine including a stand member 22 that supports the boom 11 in a state in which 3 is grounded, the stand member 22 has a use posture in which the stand member 22 is grounded by protruding from the boom 11 to the rear side and supports the boom 11. , Swingably attached to the front lower part of the boom 11 so as to swing upward from this use posture to a non-use posture along the boom 11, and swing to the non-use posture in the use posture. and brought into contact with the rear surface of the boom 11 so as to regulate the Bei the contact portion 24 for receiving a load from the boom 11 to the stand member 22
Well, swing this abutment portion 24 to the boom 11 via the support shaft 27.
Stand member 22 can swing by supporting it freely
And the abutment portion 24 in the axial direction of the support shaft 27.
By moving the contact part 24 to the boom 11.
Not used depending on the position where it hits and the posture of the stand member 22
From the abutment part of the boom 11 to allow swinging to the posture
It is characterized in that the position can be changed to the position to be displayed.

A bracket fixed to the boom 11
The abutment portion 24 swings to the 28A and 28B via the support shaft 27.
Is supported at the contact portion 24, and the contact portion 24 is supported by a support shaft 27.
By moving the bracket 28A, 2
8B is fitted to the locking pin 31 provided on the 8B so that it can be freely inserted and removed,
With the stand member 22 floating from the ground E,
It is also characterized in that an engagement hole 32 for keeping the member 22 in the use posture is provided . Further, the front side of the boom 11 is the front wheel 4 of the vehicle 2.
The boom 11 is detachably mountable to the vehicle 2 so that the stand member 22 is located on the front side of the boom 11.
It is also characterized in that it is provided on the front part of the vehicle so as to be in contact with the front side of the front wheel 4 in the use posture.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a loader working machine (front loader) 1 is detachably attached to a front portion of a vehicle 2 exemplified by a two-shaft, four-wheel tractor. On both left and right sides of the front lower part of the vehicle 2, a support base 3 which is projected outward in the left-right direction (vehicle width direction) is fixed, and on the left and right support bases 3 behind the left and right front wheels 4 of the vehicle 2. ,
The frame mount 5 is fixed upright.

Each of the left and right frame mounts 5 is formed in a U-shaped box frame that is opened forward and upward from the left and right side walls and the rear wall, and the left and right side pin insertion holes 6 are formed in the upper portions of the left and right side walls. An arcuate engagement concave portion 7 that is open upward is formed in the middle of the front portion of each of the left and right side walls in the vertical direction. The loader work machine 1 includes a side frame 8 which is detachably mounted on the frame mount 5, and a spindle 10 which is located outside the hood 9 of the vehicle 2 and is located on the upper end side of the side frame 8.
A pair of left and right booms 11 pivotally attached to each other is provided, and a bucket (work implement) 13 is attached to the tip ends of the left and right booms 11 via a support shaft 12 so as to be rotatable about an axis in the left-right direction. It is mainly composed to prepare.

Each of the left and right side frames 8 can be inserted into the frame mounting base 5 from the front side, and at the lower part thereof, can be rotated around the axial center in the left and right direction from above in the left and right engaging recesses 7 of the frame mounting base 5. The engaging pin 14 to be fitted is provided, and at the middle of the rear portion in the up-down direction, the left and right sides that match the left and right pin insertion holes 6 of the frame mount 5 in a state where the engaging pin 14 is fitted in the engaging recessed portion 7. Directional pin insertion holes 15 are formed. Then, by inserting the connecting pin into both pin insertion holes 6 and 15 to prevent the connecting pin from coming off, the rotation of the side frame 8 around the engaging pin 14 and the upward movement are restricted, and the side frame 8 is It is attached and fixed to the frame mount 5.

Each of the left and right booms 11 is located above the front wheel 4 and has a base end side attached to an upper end side of the side frame 8 via a support shaft 10 so as to be rotatable about an axial center in the left and right direction. The first extending from the frame 8 to the front
The boom portion 11A and the second boom portion 11B located on the front side of the front wheel 4 and extending forward and downward from the front end of the first boom portion 11A are formed in a dogleg shape. The mounting plate 16 is fixed to a connecting portion between the second boom portion 11B and the second boom portion 11B. The middles of the left and right second boom portions 11B are connected to each other by a connecting member 17 made of a pipe material, and the bucket 1 is attached to the tip ends of the left and right second boom portions 11B.
3 is attached via a support shaft 12.

The boom 11 is located on the inner side (opposing side) in the left-right direction of the front wheel 4. A boom cylinder 18, which is a hydraulic cylinder, is arranged between the left and right mounting plates 16 and the left and right side frames 8. This boom cylinder 18
The cylinder body 18a of the cylinder is pivotally attached to the mounting plate 16 so as to be rotatable about its left-right axis, and the piston rod 18b is pivotally attached to the side frame 8 so as to be rotatable about its left-right axis. By moving the rod 18b back and forth, the boom 11 is vertically swung around the support shaft 10.

Between the left and right mounting plates 16 and the bucket 13,
A bucket cylinder 19 composed of a hydraulic cylinder is arranged. Cylinder body 19 of this bucket cylinder 19
a is rotatably attached to the mounting plate 16 so as to be rotatable about its axis in the left-right direction, and one end of a pair of links 20, 21 is rotatable about its axis in the left-right direction at the tip end side of the piston rod 19b. The other end of one of the links 20 is pivotally attached to the lower side of the second boom portion 11B so as to be rotatable around the axis in the left-right direction, and the other end of the other link 21 is attached to the bucket 13. The bucket 13 is rotatably pivoted about an axial center in the left-right direction, and by moving the piston rod 19b back and forth, the bucket 13
Is swingable up and down around the support shaft 12.

As shown in FIGS. 1 to 6, each of the left and right booms 11 is provided with a stand member 22 for supporting the boom 11 with the bucket 13 grounded when the loader working machine 1 is removed from the vehicle 2. ing. The stand member 22 includes a leg portion 23 formed of a tubular body having a rectangular cross section, an abutment portion 24 fixed to an outer side surface in the left-right direction on one end side of the leg portion 23 and abutting on the boom 11, and a leg portion 23. A grounding portion 25 fixed to the other end side of the leg 23 and grounded to the ground. A reinforcing member 26 made of a plate material is provided on the inner side surface of the leg portion 23 on one end side in the left-right direction and the contact portion 24 and the left-right direction. It is fixed so as to be opposed to.

The inner side surface (inner side) of the boom 11 in the left-right direction means the facing surface (opposing side) of the left and right booms 11,
The outer side surface (outer side) of the boom 11 in the left-right direction means an opposite surface (anti-opposite side) of the left and right booms 11, and the inner side in the left-right direction of the boom 11 means a direction toward the other boom 11 that opposes. The outer side in the left-right direction of the boom 11 refers to the direction away from the other boom 11 that faces the boom 11. The contact portion 24 is formed of a plate material in a substantially triangular shape, and is attached to a lower portion of the second boom portion 11B of the boom 11 via a support shaft 27 and a pair of left and right direction inner and outer brackets 28A and 28B. The bracket 28A on the inner side in the left-right direction is fixed to the inner side surface in the left-right direction of the second boom portion 11B so as to project to the rear side of the second boom portion 11B, and the bracket 28B on the outer side in the left-right direction is spaced a predetermined distance from the inner bracket 28A. It is arranged so as to face each other, and is fixed so as to project to the rear surface side of the second boom portion 11B to the contact plate 29 that is fixedly overlapped with the rear surface of the second boom portion 11B.

The abutment portion 24 is located outward of the outer bracket 28B in the left-right direction, the reinforcing member 26 is located between the inner and outer brackets 28A and 28B, and the support shaft 27 is provided with the abutment portion 24 and the reinforcing member 26. And the inner and outer brackets 28A,
28B movably in the left-right direction, and contacting portion 2
4 and the reinforcing member 26 are rotatably attached around the axis in the left-right direction and movably in the axis, and the movement of the axis causes the contact portion 24 to move. The position where the contact surface 24a contacts the back side of the second boom portion 11B via the contact plate 29, and the second boom portion 11
It is movable to a position away from the abutting portion on the back side of B. Further, retaining members 30 are attached to both ends of the support shaft 27.

As shown by the solid lines in FIGS. 2, 3 and 4 and by the phantom lines in FIG. 1, the stand member 22 is
At a position where the contact surface 24a of the contact portion 24 contacts the rear side of the second boom portion 11B, the leg portion 23 is protruded from the second boom portion 11B to the rear side, and the ground portion 25 grounds to contact the bucket 13. Is in a use posture to support the boom 11 in a state of being grounded. From this state, as shown by a virtual line in FIG.
4 and the reinforcing member 26 are moved outward in the left-right direction together with the support shaft 27, the contact portion 24 is disengaged from the contact portion of the second boom portion 11B, and the stand member 22 moves from the use posture to the support shaft 27.
By swinging the stand member 22 upward around the support shaft 27 from the use position,
As shown by a solid line in FIG. 1 and an imaginary line in FIG. 3, the stand member 22 can be in a non-use posture along the second boom part 11B, and the posture can be freely changed between the use posture and the non-use posture. Has been done.

Further, a locking pin 31 projecting outward in the left-right direction is fixed to the inner bracket 28A, and the abutting portion 24 is abutted on the reinforcing member 26 with the abutting portion of the second boom portion 11B. When the stand member 22 floats above the ground E, the stand member 22 is fitted onto the locking pin 31 when the stand member 22 is moved from the position separated from the position to the position contacted with the contact portion of the second boom portion 11B. Engagement hole 32 for keeping the stand member 22 in the use posture
Are formed. In addition, as shown in FIG. 5 and FIG.
A locking pin 33 is fixed to the upper rear surface of the second boom portion 11B so as to project toward the rear surface of the second boom portion 11B, and the locking pin 33 is fixed to the ground portion 25 when the stand member 22 is in the non-use posture. A fitting hole 34 to be externally fitted is formed, and the fitting hole 34 is fitted to the locking pin 33, and a retaining member 35 such as a beta pin is attached to the locking pin 33, so that the stand member 22 is not used. Can be held.

In the above construction, in order to remove the loader working machine 1 from the mounted state shown by the solid line in FIG. 1, the lower end tip of the bucket 13 is grounded and the stand member 22 is in the non-use posture. The posture is changed to the use posture, and the connecting pin inserted through the pin insertion hole 6 of the frame mount 5 and the pin insertion hole 15 of the side frame 8 is removed. At this time, the ground portion 25 of the stand member 22 is in a non-grounded state. Next, when the bucket cylinder 19 is contracted to swing the bucket 13 around the support shaft 12 in the arrow A direction (upward), the boom 11 first
When the stand member 22 is grounded by swinging in the direction of arrow B (downward) around the engagement pin 14, and the stand member 22 is grounded, this time it is swung in the direction of arrow B around the grounded portion of the stand member 22. As shown in FIG. 2, the engaging pin 14 of the side frame 8 is disengaged upward from the engaging recess 7 of the frame mount 5, and the boom 11 is supported by the stand member 22 with the bucket 13 grounded. The working machine 1 can be maintained in the standing state.

Thereafter, the hydraulic hose on the loader working machine 1 side is disconnected from the hydraulic hose (hydraulic piping) on the vehicle 2 side, and the vehicle 2 is retracted. Further, in order to mount the loader working machine 1, the operation reverse to the above may be performed. In the case of the above-described configuration, when the loader working machine 1 is in the standing state, the contact portion 24 of the stand member 22 has the second boom portion 11
Since the stand member 22 supports the boom 11 in a state where the stand member 22 is in contact with the back side of B and the ground portion 25 is grounded, the boom 11
The load from the second boom portion 11B can be reliably received, and even if the contact portion 24 of the stand member 22 is brought into contact with the back side of the second boom portion 11B, the contact portion 24 of the second boom portion 11B is not affected. By removing the stand member 22 from the abutting portion, the stand member 22 can be brought into a posture along the second boom portion 11B.

Further, in a state where the loader working machine 1 is mounted on the vehicle 2, when the stand member 22 is in the use posture,
Since the front member 4 is located in front of the front wheel 4, the stand member 22 is not likely to interfere with the front wheel 4 when the vehicle 2 is retracted after the loader working machine 1 is removed.
2 can be located inward from the outer surface of the front wheel 4 in the left-right direction, the stand member 22 does not project from the loader working machine 1, and is compact in the left-right direction. The design of the above embodiment can be changed as appropriate. For example, in the illustrated example, the abutment portion 24, the grounding portion 25, and the reinforcing member 26 of the stand member 22 are formed separately from the leg portion 23 and are fixed to the leg portion 23. ，
26 may be integrally formed with the leg portion 23. Also, the legs 23
May be pivotally supported by a support shaft 27, and further, the contact portion 2
4 (and the reinforcing member 26) may be supported so as to be movable in the left-right direction with respect to the leg portion 23, and the position thereof may be freely changed between a position in contact with the boom 11 and a position in which the boom 11 is separated from the contact part.

Further, the engaging concave portion 7 is provided on the side frame 8,
The engagement pin 14 may be provided on the frame mount 5, or the side frame 8 and the vehicle body may be detachably connected by a brace.

[0025]

According to the present invention, the stand member 22 for supporting the boom 11 in a state in which the working tool 13 is grounded is used in such a manner that the stand member 22 is projected from the boom 11 to the rear side and is grounded to support the boom 11. Swing upward from this use posture to change the posture to a non-use posture along the boom 11.
The boom 11 is swingably attached to the lower part of the boom 11, and in the above-mentioned use posture, a contact portion 24 that contacts the back surface of the boom 11 so as to regulate the swing to the non-use posture and receives the load from the boom 11. In addition to being provided on the stand member 22, the abutment portion 24 is movable so that the abutment portion 24 is disengaged from the abutment portion of the boom 11 in order to allow swinging from the use posture to the non-use posture. Since it is characterized by,
4 contacts the back surface of the boom 11 so that the stand member 22 can sufficiently receive the load of the boom 11, and the stand member 22 contacts the back surface side of the boom 11,
The stand member 22 can be rotated upward from the use posture to be changed to the non-use posture along the boom 11, and can be stored, which is easy to handle. . Also, the contact part 24
By supporting the boom 11 on the boom 11 via the support shaft 27 so that the stand member 22 can swing, and by moving the contact portion 24 in the axial direction of the support shaft 27, The stand member 22 is moved in the axial direction of the support shaft 27 by enabling the position of the contact portion 24 to contact the boom 11 and the position where the contact portion 24 is disengaged from the contact portion of the boom 11. By swinging around the support shaft 27, the posture of the stand member 22 is changed between the use posture and the non-use posture, and the handling is easy.

The boom 11 is detachably mountable to the vehicle 2 so that the front side of the boom 11 is located in front of the front wheels 4 of the vehicle 2, and the stand member 22 is used for the boom 1.
By providing the front portion of the vehicle 1 on the front side of the front wheel 4 in the use posture, there is no fear that the front wheel 4 of the vehicle 2 interferes with the stand member 22 when the loader working machine is attached to or detached from the vehicle 2. The stand member 22 can be housed within the width of the loader working machine in the left-right direction.

[Brief description of drawings]

FIG. 1 is a side view of a loader work machine mounted on a vehicle.

FIG. 2 is a side view of the loader work machine in a state where it is separated from the vehicle.

FIG. 3 is a side view of a mounting portion of a stand member.

4 is a cross-sectional view taken along the line DD of FIG.

FIG. 5 is a rear view of a mounting portion of a ground member of a stand member.

FIG. 6 is a side cross-sectional view of a mounting portion of a ground member of a stand member.

[Explanation of symbols]

11 boom 13 buckets (work implements) 22 Stand member 24 Service Department

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Claims (3)

(57) [Claims] 1. A boom (11) and the boom (11)
Work tool (13) provided on the tip side of the work tool (1)
In a loader working machine provided with a stand member (22) for supporting the boom (11) in a state in which 3) is grounded, the stand member (22) is grounded by being protruded from the boom (11) to the rear side. It is possible to swing to the lower front portion of the boom (11) so as to change the posture to use the boom (11) to support it and to swing it upward from this use posture to a non-use posture along the boom (11). The stand member (24) attached to the back surface of the boom (11) so as to restrict swinging to the non-use posture in the above-mentioned use posture and to receive a load from the boom (11). Prepare for 22)
Well, this abutment part (24) is attached to the boom (11) by the support shaft (2
The stand member can be swingably supported via 7).
(22) is swingable, and the abutment portion (24) is
By moving the support shaft (27) in the axial direction,
This part (24) contacts the boom (11), and
Swing of the stand member (22) from the use position to the non-use position
Position where it comes off the abutment part of the boom (11) to allow
A loader working machine characterized in that the positions thereof can be changed to and . 2. A bracket fixed to a boom (11)
(28A, 28B) via the support shaft (27), the contact portion (2
4) is swingably supported, and is abutted to the abutment portion (24).
To move the part (24) in the axial direction of the support shaft (27).
The locking pin provided on the bracket (28A, 28B).
And the stand member (2
2) the stand member (2
The loader working machine according to claim 1, further comprising an engagement hole (32) for keeping the position (2) in a use posture . 3. The boom (11) so that the front side of the boom (11) is located in front of the front wheels (4) of the vehicle (2).
Is detachably attachable to the vehicle (2), and a stand member (22) is provided at the front of the boom (11) so as to be in contact with the front side of the front wheel (4) in the use posture. The loader working machine according to claim 1 or 2, which is characterized.