JPH05287769A - Stand device of front loader - Google Patents

Abstract

PURPOSE:To enable a brace to rely on itself by an auxiliary ground contact body in the case a front loader is separated from the chassis and is in a state of a standing-attitude, to scarcely apply load to a boom cylinder and to make it possible to hold the standing attitude of the front loader even if a hydraulic hose connected to the boom cylinder is disconnected to have no oil pressure. CONSTITUTION:A boom cylinder 5 and a brace 6 are connected to a mast 4 pivoting a boom 3 of a front loader 2, and a mast mounting table 8 mounting the mast 4 in a state to change its attitude from an attitude bent forward to a standing attitude through the boom cylinder 5 is provided after the lower part of the mast 4 is inserted in the midst of the front and rear of the chassis 7, and a brace coupling body 9 connected to the front end of the brace 6 is provided to the front of the chassis 7. The front end of the brace 6 can contact with the ground when the mast 4 takes an attitude bent forward. An auxiliary ground contact body 19 contacting with the ground in a separation from the front end in the front and rear direction is provided to the brace 6 in the case the front end contacts with the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stand device for a front loader which is detachably mounted on a vehicle body such as a tractor.

[0002]

2. Description of the Related Art For example, a detachable front loader mounted on a tractor connects a boom cylinder and a brace to a mast that pivotally supports the boom, and inserts the lower part of the mast midway in the front-rear direction of the vehicle body. A mast mount is provided to mount the mast in a state in which the mast is changed from the forward leaning posture to the standing posture, and the brace connecting body that is connected to the tip of the brace is provided on the front portion of the vehicle body.

The front loader is provided with a stand device for holding the front loader in a standing posture when the front loader is separated from the vehicle body. As the stand device, the tip of the brace is grounded. There is something I did. Since this stand device can be equipped with the front loader when it is attached or detached, its use is extremely simple.

[0004]

However, in the above-mentioned prior art, the brace / stand unit has only one leg, and the posture of the front loader must be maintained at two points in front and back with the work tool at the tip of the boom. In addition, it is very unstable, and in order to withstand the load applied to the brace, it is necessary to provide a stop valve in the hydraulic circuit of the boom cylinder, and it is necessary to operate this stop valve. Attaching and detaching operations are troublesome.

The present invention provides a stand device for a front loader, which is capable of solving the above-mentioned problems of the prior art by providing the brace with an auxiliary grounding body which is grounded away from the tip of the brace in the front-rear direction. To aim.

[0006]

A concrete means for solving the problems in the present invention is to connect a boom cylinder 5 and a brace 6 to a mast 4 which pivotally supports a boom 3 of a front loader 2 and to connect the front and rear of a vehicle body 7. After inserting the lower part of the mast 4 in the middle of the direction, a mast mounting base 8 is provided which is mounted via the boom cylinder 5 in a state in which the mast 4 is changed from the forward tilted posture to the standing posture. In a stand device of a front loader in which a brace connecting body 9 for connection is provided, and the tip of the brace 6 can be grounded when the mast 4 is tilted forward, the tip of the brace 6 is grounded when the tip is grounded. That is, the auxiliary grounding body 19 is provided which is grounded separately in the front-rear direction.

[0007]

Operation: After removing the connecting pin 13 penetrating the mast mount 8 and the mast 4 from the vehicle body 7, the boom cylinder 5
As the mast 4 is extended, the mast 4 starts to change from the standing posture to the forward leaning posture, and at the same time as the posture is changed, the brace 6 integrally provided with the mast 4 is lowered at the front end, The horizontal bar member 15 at the tip is detached downward from the fitting portion 16 of the brace connector 9.

When the brace 6 descends, the tip of the brace 6 comes into contact with the ground, and when the boom cylinder 5 is further extended, the auxiliary grounding body 19 provided on the brace 6 also comes into contact with the ground. This auxiliary grounding body 19
Is grounded in front of the tip of the brace 6. As a result, the front loader 2 is grounded at three points of the tip of the brace 6, the auxiliary grounding body 19, and the work implement 28, and is held in the standing posture, and the brace 6 is two-point grounded. Therefore, the front loader 2 is supported even if the hydraulic pressure of the boom cylinder 5 is removed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6, reference numeral 1 denotes a tractor having a front loader 2 and a cabin 21. The vehicle body 7 is composed of an engine 22, a clutch housing, a transmission case, a front axle frame 23 protruding from the engine 22, and the like. Is covered with. Reference numeral 25 denotes an operation panel, and 26 denotes a steering wheel. A driver's seat is arranged behind the steering panel, which serves as a control unit 27.

The front loader 2 pivotally supports the base of the boom 3 via a pin on the upper end of the mast 4, and the boom cylinder 5 connected to the lower portion of the mast 4 enables the boom 3 to move up and down. Work tool 2 such as a bucket at the tip of
8 is pivotally supported, and the bucket cylinder 29 enables dump and squeeze operation. A brace 6 is projected from the upper part of the mast 4 to the lower front side.

The boom 3, the mast 4, the boom cylinder 5, the brace 6 and the like have a left and right pair, the left and right booms 3 are connected to each other, and the upper ends of the left and right masts 4 are connected to each other by a connecting strip 40. The left and right brace 6 have free ends or are connected to each other. The mast 4 has a U-shaped cross section, and a reinforcing plate member 36 is fixed inside thereof.
The angle receiving member 1 is welded to the lower portion to form a substantially V-shaped rotation receiving portion 1
1 is formed. In addition, a pin hole 37 is formed in the middle of the mast 4 in the vertical direction, and the pin hole 37 is located above the rotation receiving portion 11.

A mast mount 8 is fixed to the left and right midway portions of the vehicle body 7, and a brace connecting body 9 is provided at the left and right front ends of the front axle frame 23, by which the front loader 2 can be freely attached and detached. Is attached to. Each of the left and right mast mounts 8 fixes the connecting bracket 30 and the support cylinder 31 to a bracket fixed to the side surface of the clutch housing by bolts, and connects the connecting bracket 30 to the front axle frame 23 by bolts to support the support cylinder 31 and the vehicle body 7. The rear axle case of the rear part is connected by a reinforcing member 32.

A stand frame 33, which forms the main body of the mast mount 8, is erected on the support cylinder 31. The base frame 33 has a U-shaped cross section and is open to the front, and a plate member 35 that forms a receiving surface 34 and also serves as reinforcement is welded inside thereof. Also, the base frame 3
A pin is provided in the front part of the upper and lower midway part of 1 to form a rotation fulcrum part 12, and a pin hole as a pin receiving part 14 through which a connecting pin 13 penetrates is received in the upper part. Has been drilled.

The receiving surface 34 and the lower end surface of the mast 4 which faces the receiving surface 34 are respectively raised to the rear and are inclined surfaces 43,
When the mast 4 comes into the mast mount 8, both rising inclined surfaces 43 and 44 come into contact with each other to move the mast 4 forward to rotate the rotation receiving portion 11 as a fulcrum. Part 1
2 is surely engaged, and the play of the mast 4 in the front-rear direction is eliminated.

Each left and right brace 6 is provided with a linear strip plate 38 on a bracket 41 fixed to the mast 4 so as to project forward, and a connecting plate 39 is projected from the front end of the strip plate 38 to the lower front side. A horizontal bar member 15 that connects the left and right brace 6 is fixed to the tip. The horizontal bar member 15 may be a solid bar, but a pipe member is preferable. An auxiliary grounding body 19 is fixed to the front end of the band plate 38 in a linear extension. The auxiliary grounding body 19 is formed of a strip plate, a pipe material, a rod material, or the like, and its tip can be grounded when the front loader 2 is detached from the vehicle body 7. The tip of the brace 6, that is, the tip of the connecting plate 39. Alternatively, when the horizontal bar member 15 is grounded, it is grounded together therewith and in front of it. The brace 6 and the auxiliary grounding body 19 constitute a stand device.

The auxiliary grounding body 19 has a U-shape in plan view and connects the left and right brace 6 together.
The auxiliary grounding body 19 is disposed on the front side of the hood 24 in the state of being mounted on the hood 1 and serves as a front guard member of the tractor 1. The brace connecting body 9 is provided in a laterally long or left and right pair at the front end of the front axle frame 23, and the inverted U-shaped member 42 is welded to form the fitting portion 16. The horizontal bar member 15 can be inserted into and removed from the fitting portion 16 from below.

The rear portion of the inverted U-shaped member 42 has a fitting portion 16
It projects further downward to form a retaining portion 17. The front surface of the retaining portion 17 is shorter than the rear surface of the fitting portion 16 from the rotation fulcrum portion 12, but is longer than the rear surface of the fitting portion 16 from the pin receiving portion 14. When the integrated mast 4 and brace 6 are rotated about the rotation fulcrum portion 12, the horizontal bar member 15 can be inserted into and removed from the fitting portion 16 through the movement locus A of FIGS. ,
When the pin receiving portion 14 is rotated around the center, the horizontal bar member 15 passes through the virtual locus B of FIGS.
Cannot interfere with the fitting portion 16 due to the obstacle.

Reference numeral 45 denotes a guide which is provided so as to project further downward than the retaining portion 17 and guides the horizontal bar 15 to be fitted into the fitting portion 16. FIG. 7 shows a modification of the stand device. In this modified example, the brace 6 is formed by one linear strip plate 38, a bracket and a connecting plate are not provided, and the horizontal bar member 15 is connected to the tip of the strip plate 38. The auxiliary grounding body 19 is projected obliquely upward from a middle portion of the strip plate 38 in the front-rear direction, and is configured to be grounded in front of the tip of the strip plate 38.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the auxiliary grounding body 19 may be provided so as to project forward and downward from the brace 6 and may be grounded behind the brace 6, or may be a grounding device that is separated from the brace 6 in the front-rear direction. Further, the auxiliary grounding body 19 may not also serve as the front guard.

Next, the attaching / detaching operation of the front loader 2 with respect to the vehicle body 7 will be described. From the mounted state of the front loader 2 in FIG. 1, pull out the connecting pin 13 from the control unit 27 on the vehicle body 7,
The connection between the mast mount 8 and the mast 4 is released. When the boom cylinder 5 is extended, the mast 4
Starts rotating from the standing posture to the forward leaning posture while the lower part is in contact with the mast mount 8, and the work implement 28 is displaced forward while keeping contact with the ground (shown by phantom line in FIG. 3 and solid line in FIG. 5).

At this time, the rotation receiving portion 11 makes the rotation fulcrum portion 1
Since the mast 4 remains engaged with the mast 4, the center of rotation of the mast 4 becomes the rotation fulcrum 12, and at the same time as the attitude of the mast 4 is changed, the brace 6 integrally provided with the brace 6 has the horizontal bar member 15 at the front end. It disengages from the fitting portion 16 and descends (shown by a virtual line in FIG. 4). When the brace 6 descends, the tip of the brace 6 or the horizontal bar 15 comes into contact with the ground (state of FIG. 5), and the boom cylinder 5
As the extension operation is performed, the auxiliary grounding body 19 comes into contact with the ground in front of the tip of the brace 6 (state shown by phantom lines in FIG. 1 and solid line in FIG. 6), and the front loader 2 moves the work implement 28, the tip of the brace 6 and the auxiliary grounding body. It is grounded at 3 points with 19 and held in a standing posture.

In this standing posture, since the brace 6 is self-supporting by the auxiliary grounding body 19, almost no load is applied to the boom cylinder 5, so that the hydraulic hose connected to the boom cylinder 5 is removed and the hydraulic pressure is maintained. Even if it disappears, the boom cylinder 5 does not expand and contract, and the stand function of the brace 6 does not deteriorate. The connection and disconnection of the hydraulic hose for the boom cylinder 5 is performed when the front loader 2 is in the standing posture.

To mount the front loader 2 on the vehicle body 7 from the detached state of FIG. 6, the vehicle body 7 is moved to move the mast mount 8
Is arranged substantially below the mast 4, the boom cylinder 5 is contracted, the mast 4 is inserted into the mast mount 8, and the rotation receiving portion 11 is engaged with the rotation fulcrum portion 12. When the boom cylinder 5 is further contracted from that state, the mast 4 pivots about the pivotal fulcrum 12 from the forward tilted posture to the standing posture, the work tool 28 is pulled toward the vehicle body 7 side, and the brace 6 is moved.
The horizontal bar 15 is fitted into the fitting portion 16 of the brace assembly 9 from below through the movement locus A.

When the mast 4 is in the standing posture, the pin hole 37 of the mast 4 is concentric with the pin receiving portion 14 of the mast mounting base 8, and the connecting pin 13 is inserted into them to mount the mast 4 on the mast. It is attached to the table 8. In the state where the mast 4 is pin-connected to the mast mount 8, the load applied to the boom 3 acts to rotate the mast 4 around the connection pin 13, but the connection pin 13 is located above the rotation fulcrum portion 12. Since it is located at, the moving direction of the horizontal bar member 15 at the tip of the brace 6 changes to become a virtual locus B, and the horizontal bar member 15 hits the rear lower side of the fitting portion 16, that is, the retaining portion 17 and separates. Blocked, the brace assembly 9 supports the brace 6 as if bolted together and carries the load of the front loader 2.

[0025]

According to the present invention described in detail above, the mast 4
The front loader 2 is provided with the auxiliary grounding body 19 which is grounded separately from the front end of the brace 6 in the front-rear direction on the brace 6 whose front end can be grounded when the front loader 2 is tilted forward.
When the car is removed from the vehicle body 7 and placed in a standing position, the brace 6
Can stand on its own by the auxiliary grounding body 19, the boom cylinder 5 is hardly loaded, and even if the hydraulic hose connected to the boom cylinder 5 is removed and the hydraulic pressure is lost, the standing posture of the front loader 2 is increased. Can hold.

[Brief description of drawings]

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

FIG. 2 is a side view of the main part.

FIG. 3 is a side view of a mast and a mast mount.

FIG. 4 is a side view of the brace and the brace assembly.

FIG. 5 is a side view when the front loader is removed.

FIG. 6 is a side view when the front loader is standing.

FIG. 7 is a side view showing a modified example of the stand device.

[Explanation of symbols]

 1 tractor 2 front loader 3 boom 4 mast 5 boom cylinder 6 brace 7 vehicle body 8 mast mount 9 brace connection body 15 horizontal bar material 19 auxiliary grounding body

Claims (1)

[Claims] 1. A boom cylinder (5) and a brace (6) are connected to a mast (4) pivotally supporting a boom (3) of a front loader (2), and the mast (5) is halfway in the longitudinal direction of the vehicle body (7). After the lower part of 4) is inserted, a mast mount (8) for mounting the mast (4) in a state in which the mast (4) is changed from the forward tilted position to the standing position via the boom cylinder (5) is provided, A stand device for a front loader, wherein a brace connecting body (9) for connecting to a tip of the brace (6) is provided, and the tip of the brace (6) can be grounded when the mast (4) is tilted forward. A stand device for a front loader, characterized in that the brace (6) is provided with an auxiliary grounding body (19) which is grounded apart from the tip in the front-rear direction when the tip is grounded.