JPS6029502Y2 - Front loader attachment/detachment device for agricultural tractors - Google Patents

Description

[Detailed explanation of the invention] Front loader work using agricultural tractors is mainly for light civil engineering and transportation, and is one of the tasks performed using a tractor.
It's just a field.

Therefore, the front loader must be easily removed from the tractor when the tractor is used for work that does not require the front loader, and must be easily attached to the tractor when the front loader is needed.

For this reason, conventional front loaders have been installed on tractors in such a way that the two lift arms of the front loader can be attached to and removed from the frame of the trough tie by inserting and removing fixing pins, as shown in FIG.

However, in conventional models, large frame rollers are attached to the front from both sides of the trough tie, making it difficult to see near the front wheels, resulting in loss of sales due to trampling on crops, etc. Since the front loader is located along the bonnet hole and there is no space between them, it is difficult to inspect and maintain the trough tie, and there are other drawbacks such as requiring effort to insert and remove the fixing pin attached to the front loader trough tie. .

Therefore, in order to eliminate the above-mentioned defects, the present invention is equipped with a front bracket with a boss on both sides and a rear bracket with an engagement recess with a shaft lug guide piece on both sides. A shaft lug is provided on both sides of the frame that connects the frame, and a side arm is provided in front of the frame, and a guide bar and a stand are installed at the ends of the side arms, and the piston rod of the lift cylinder of the front loader is actuated by hydraulic pressure. The tractor can be moved in a short time by engaging and disengaging the shaft ear of the front loader into the engagement recess of the rear bracket of the tractor and the guide bar of the front loader with the boss of the front bracket of the tractor, without requiring any effort to move the tractor forward or backward. The front loader can be attached and detached, while
When the front loader is removed, the area around the front wheels of the tractor can be clearly seen, and there is space on the side of the bonnet for easy inspection and maintenance of the tractor, making it convenient for work. This relates to a front loader attachment/detachment device.

To explain the structure of one embodiment of the present invention shown in FIGS. 1 to 8, a indicates an agricultural tractor, b indicates a front loader, 1 indicates the vehicle body of the tractor a, and 2 indicates the front end of the vehicle body 1 on both sides. The front bracket is fixed, and a boss 4 with a pin hole 3 is provided projecting from the front end of the outer surface thereof.

Reference numeral 5 denotes a U-shaped rear bracket attached to both sides of the middle part of the vehicle body 1, which has an axis engagement recess 6 formed in the middle part of both sides, and a lower part of the engagement recess 6 protrudes forward. Install the shaft rotation guide piece 7.

Reference numeral 8 denotes lift arms on both sides of the front loader b, with the lower part of the dirt packet 9 of the working device pivoted at the tip thereof, and the receiver 10 on the front part of the lift arm 8 and the dump cylinder 11 on the upper part of the packet 9. The proximal end and the tip of the piston rod 12 are respectively pivotally connected.

13 is a U-shaped frame with a lift arm 8 at its upper end.
The base end of the lift cylinder 16 and the tip of its piston rod 17 are pivotally connected to the support 15 below the middle of the lift arm 8 and the lower part of the frame 13 by pins 18 and 19, respectively. A shaft 20 is provided protruding from both sides of the lower end of the seat frame 13.

Reference numeral 21 denotes a side arm that protrudes forward from the middle part of the inner surface of the frame 13 and has a distal end bent diagonally forward, and inside the distal end is a detachment guide piece 2 whose front part is bent diagonally forward and upward.
2, is provided with a wedge-shaped guide 25 whose rear part is the mounting guide piece 23 and whose lower end is the positioning guide piece 24, and which expands slightly upward. Pin holes 26 are bored in the arm 21, and the pin holes 26.3 are made to match when the positioning guide piece 24 comes into contact with the boss 4 of the front bracket 2.

Reference numeral 27 denotes a vertical receiving tube protruding from the front end of the side arm 21, into which a stand 28 is fitted so as to be able to rise and fall freely. It is fixed by a fixing pin 29 which is removably inserted into a pin hole of the stand 28.

30 is a fixing pin of the front loader b.

Although not shown, the pressure oil generator of the tractor a, the dump cylinder 11, and the lift cylinder 16 are connected by a removable pressure oil pipe 31 as in the conventional front loader shown in FIG. be.

Next, its effect will be explained.

When removing front loader b from the state shown in FIG. 1, when front loader b is attached to tractor a, Raise the front wheels of the vehicle above the ground.

(2) Remove the fixing pin 29 of the stand 28 and
As shown in the figure, the stand 28 is lowered and the fixing pin 29 is inserted into the pin hole of the receiver tube 27 and the upper pin hole of the stand 28 to fix the stand 28.

(3) Remove the fixing pin 30 of the front loader b.

(4) When the piston rod 17 of the lift cylinder 16 is moved forward, the frame 1 with the side arm 21 of the front loader b
3 rotates counterclockwise in FIG. 4 using the pivot 20 as a fulcrum, and the tip of the side arm 21 descends, so that the guide piece for detaching the guide metal 25 of the side arm 21 as shown in FIG. 22 slides on the boss 4, and as the front loader b moves forward under the guidance of the detachment guide piece 22, the frame 13 with the side arm 21 rotates, and the shaft 20 also advances from the engagement recess 6 and detaches. and reaches the top of the guide piece 7.

(5) When the piston rod 17 of the lift cylinder 16 moves further forward, the detachment guide piece 22 of the guide metal 21 detaches from the boss 4 as shown in FIG. Stand 2 does not rotate around the fulcrum.
8 is grounded, and the front loader b is supported on the ground by the stand 28.

(6) Then the piston rod 17 of the lift cylinder 16
When the frame 13 with the side arm 21 moves forward, the frame 13 with the side arm 21 moves towards the stand 2.
The shaft 20 is rotated counterclockwise in FIG. 2 using the grounding point 8 as a fulcrum, and the shaft 20 is lifted off the guide piece 7 as shown in FIG.

(7) Separate the pressure oil piping 31 of tractor a and front loader b.

(8) Move tractor a backward.

Then, as shown in Figure 2, place front loader b on stand 2.
At 8, the front loader b is supported on the ground and separated from the tractor a.

On the other hand, when attaching front loader b to tractor a from the above state, contrary to the above, (1) from the state shown in FIG. 2, as shown in FIG.
Tractor a is advanced to a position above the guide piece 7 of tractor a.

(2) Connect the pressure oil piping 31 of the tractor a and the front loader b.

(3) When the piston rod 17 of the lift cylinder 16 is moved backward, the frame 13 with the side arm 21 of the front loader b rotates clockwise in FIG. 2 using the grounding point of the stand 28 as a fulcrum, and as shown in FIG. From the state shown, the shaft 20 of the frame 13 rests on the guide piece 7 as shown in FIG.

<41 Furthermore, the piston rod 1 of the lift cylinder 16
7 retreats, the frame 13 with the side arm 21 rotates 20
The stand 28 is rotated clockwise as shown in FIG. 6 as a fulcrum, and the stand 28 is lifted off the ground.
The installation guide piece 23 touches the boss 4.

(5) Then the piston rod 17 of the lift cylinder 16
When the frame 13 with the side arm 21 moves backward, the frame 13 with the side arm 21 continues to rotate clockwise as shown in FIG. The guide piece 23 slides on the boss 4, and as the front loader b is guided by the mounting guide piece 23, the frame 13 with the side arm 21 rotates while the front loader b moves backward, and the frame 13 with the side arm 21 rotates as shown in FIG.
The shaft rotation 20 of No. 3 fits into the engagement recess 6 and the rear bracket 5
At the same time, the positioning guide piece 24 of the guide bar 25 comes into contact with the boss 4 and the pin hole 3 of the side arm 21 and the boss 4 are connected to each other.
26 match, and thereafter the front wheels of the tractor a are slightly lifted off the ground due to the retreat of the piston rod 17 of the lift cylinder 16.

(6) Fixing pin 3 in pin holes 3, 26 of boss 4 and side arm 21
Insert 0.

(7) Remove the fixing pin 29 of the stand 28, raise the stand 28 as shown in FIG. 28 is fixed.

Note that by connecting the front portions of both arms 21 with a horizontal rod, both arms 21 can be made rigid.

In addition, when the stand 28 is attached to the receiver tube 27 so that it can be raised and lowered, the stand 28 can be adjusted up and down to match the unevenness of the ground when attaching and detaching the front loader b to the tractor a, making it possible to attach and detach the front loader b more smoothly. It can be carried out.

In another embodiment of the present invention shown in FIGS. 9 and 10, the fixing pin 30 of the front loader b is attached to the rear bracket. has an empty boss 4',
A U-shaped support member 32 is attached to the outer rear part of the rear bracket 5, and a pin hole 3' is bored in both sides of the support member 32 so as to be concentric with the engagement recess 6 of the rear bracket 5. However, the frame 13 is provided with a bottle hole extending axially on both sides 20'.

21' is a side arm. Even in this structure, if the fixing pin 30 of the front loader b is removed from the pin hole of the frame 13 and the pin hole 3' of the support metal 32 and operated in the same manner as described above, the front loader will work in the same manner as described above. b is attached to and detached from tractor a, while side arm 2 is attached to and detached from tractor a as shown in FIG.
The positioning guide piece 24 of the guide bar 25 of 1' comes into contact with the boss 4', and the axis 20' of the frame 13 moves towards the rear bracket 5.
When it is fitted into the engagement recess 6, the pin hole of the shaft 20' and the pin hole 3' of the support metal 32 match, so when the fixing pin 30 is inserted into those pin holes, the side arm 21' is attached. A frame 13 is supported by front and rear brackets 2 and 5, and a front loader b can be attached to a tractor a.

Also, the boss 4' and the side arm 21' are shown in FIGS. 1 to 8.
The structure is similar to the boss 4 and side arm 21 in the embodiment shown in the figure, and the bottle holes 3 and 26 of the boss 4 and side arm 21, the bottle hole of the shaft 20', and the bottle hole 3' of the support metal 32 are connected to each other. By inserting the fixing pins 30 respectively, the frame 13 with the side arms 21' is assembled.
may be fixed to the front and rear brackets 2 and 5.

Another embodiment of the present invention shown in FIG.
Another example of No. 8 is shown, in which the F-shaped side arm 21 is extended toward the distal end and the extended portion is used as a stand 28'.

In this structure as well, if the piston rod 17 of the lift cylinder 16 is advanced when removing the front loader b from the tractor a, the frame 13 with the side arm 21 operates in the same manner as described above, and the tip of the side arm 21 moves forward. descending to the first
As shown in FIG. 1, the end stand 28' of the side arm 21 is grounded, and this stand 28'
8, and thereby supports the front loader b.

In the present invention, the front loader attachment/detachment device for an agricultural tractor is configured as described above, so that the front loader can be attached by simply placing the brackets on both sides of the tractor.

Therefore, when the front loader is removed, the visibility of the front wheels of the tractor is good, making it easy to drive, and the engine cover at the front of the tractor can be opened and closed easily, making inspection and maintenance of the tractor easy. , and because the pin holes of the front loader's fixing pin are forcibly aligned using a hydraulic cylinder, the operating force for inserting and extracting the fixing pin is minimal, making it possible to easily and smoothly attach and detach the fixing pin. .

Furthermore, when the front loader is removed on soft ground, even if the front loader sinks into the ground due to its own weight and the height of its frame is lowered above ground, the front loader frame can still be activated by moving the lift cylinder's piston rod forward. In addition, the positioning guide piece of the side arm guide plate can be brought into contact with the boss of the front bracket, and the pin of the front loader fixing pin Holes can be aligned accurately, and by moving the piston rods of the lift cylinders back and forth, the frame with side arms rotates and the stand moves up and down, so the piston rods of the left and right lift cylinders can be aligned even on rough terrain. By changing the forward movement, the front loader can be supported by the stands on both sides with the stands on both sides always in contact with the ground, and the front loader can be removed, thereby stabilizing the support of the front loader.

In addition, when attaching or detaching the front loader to the tractor,
The tractor can be moved forward or backward by keeping the front loader's axis floating above the guide piece of the tractor's bracket, making it easy to move the tractor when attaching or detaching the front loader. The front and rear positioning guide pieces and the shaft are fitted and supported by the front and rear brackets of the tractor, respectively, so that the installation to the tractor is reliable and firm, and the structure is simple and can be manufactured easily and inexpensively.
Its operation is light and smooth.

In addition, if the stand is installed on the side arm so that it can be raised and lowered, when the front loader is attached to the tractor, the stand will be raised and fixed, and the stand will not only protect the bonnet of the tractor, but also protect the front end of the tractor. It has the practical benefit of serving as a landmark.

[Brief explanation of the drawing]

Fig. 1 is a side view of an agricultural tractor according to an embodiment of the present invention with a front loader attached, Fig. 2 is a side view of the tractor and front loader separated, and Fig. 3 is the same as that shown in Fig. 2. 4 to 7 are side views explaining the operation of the main parts for attachment and removal, showing the operating sequence when the front loader is removed from the tractor, and FIG. 8 is a side view of the main parts for attachment and removal when the front loader is attached to the tractor. Action explanation side view,
FIG. 9 is a side view of the main part showing another embodiment of the same detachable part;
Fig. 10 is a perspective view of the rear bracket part, Fig. 11 is a side view of a front loader showing another embodiment of the above stand, and Fig. 12 is a side view of a conventional agricultural tractor and front loader separated. be. a...Tractor, b...Front loader, 1...Vehicle body, 2...Front bracket, 3...Pin hole, 4. ...Boss, 5...
... Rear bracket, 6 ... Engagement recess, 7
..... Axis rotation guide piece, 8 ..... Lift arm, 13 ..... Frame, 16 ..... Lift cylinder, 17 ..... Piston rod. 20...
... Axial rotation, 21 ... Lateral arm, 22 ...
- Detachment guide piece, 23... Attachment guide piece, 24
・・・・・・Positioning guide piece, 25・・・Ribular guide metal, 26・・・Pin hole, 28・・・Stand, 30・・・Fixing pin .

Claims (1)

[Scope of utility model registration request] The base ends of the lift arms on both sides of the front loader are pivoted to the upper end of the frame, the middle part of the lift arms and the lower part of the frame are connected by a lift cylinder with a piston rod, and shaft ears are provided on both sides of the lower end of the frame. A side arm is protruded from the front, and at the tip of the side arm, the front part is a detachment guide piece, the rear part is a mounting guide piece, and the lower part is a positioning guide piece. A stand was attached to the tip of the side arm, front and rear brackets were attached to both sides of the tractor body, a boss was attached to the front bracket, and a shaft lug guide piece was attached to the rear bracket protruding from the bottom front. Engagement recesses are provided respectively, the above-mentioned shaft ears are fitted into the engagement recesses, the positioning guide piece is brought into contact with the boss, and the fixing pin is removably inserted into the boss and the pin hole of the side arm. A front loader attachment/detachment device for agricultural tractors.