JPH0373702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for attaching a front loader to a tractor.

(Prior art) It is desirable that the front loader be one that can be easily attached to and detached from the tractor when necessary.
The one disclosed in No. 31364 is known. In other words, the device for attaching and detaching a front loader to an agricultural tractor disclosed in Utility Model Application Publication No. 57-31364 has a front bracket with a boss on both sides and a rear bracket with an engagement recess with a shaft lug guide piece attached to the body of the tractor. On the other hand, install shaft ears on both sides of the frame that connects the lift arm and lift cylinder of the front loader.
A side arm is provided at the front, and a guide metal and a stand are attached to the tips of the side arms, and hydraulic pressure is used to operate the piston rod of the lift cylinder of the front loader and move the tractor forward and backward without requiring any effort. The front loader can be attached to and detached from the tractor in a short time by engaging and disengaging the loader's shaft lug with the engagement recess of the tractor's rear bracket and the front loader's concave guide with the tractor's front bracket boss. .

However, in the front loader attachment/detachment device for an agricultural tractor disclosed in this Japanese Utility Model Application Publication No. 57-31364, when installing the front loader, the above-mentioned shaft lug is fitted into the engagement recess, and the positioning guide piece is attached to the boss. After making contact with the boss, a fixing pin is inserted into the pin hole of the boss and the side arm. On the other hand, when detaching the fixing pin, it is necessary to remove the fixing pin beforehand. The operator had to get out of the driver's seat each time, and the work efficiency was poor.

(Object of the Invention) In view of the above-mentioned drawbacks of conventional devices, an object of the present invention is to provide a device for attaching a front loader to a tractor, which allows the front loader to be attached to and detached from the tractor with good work efficiency. It is something.

(Structure of the Invention) The present invention includes a frame extending substantially upwardly and downwardly, a lift arm having a base pivotally connected to the upper part of the frame, one end pivotally connected to the lift arm, and the other end pivotally connected to the lower part of the frame. A front loader tractor comprising a hydraulic cylinder device attached to the frame, and a frame stay having a base end fixed to a lower part of the frame and extending forward from a horizontal part and a vertical part extending downward from the tip of the horizontal part. A mounting device for attaching the vehicle to the tractor, wherein a shaft is fixed to one of both sides of the front portion of the vehicle body of the tractor and the rear side of the vertical portion of the frame stay, and a hook capable of engaging with the shaft is fixed to the other side. A pin is rotatably mounted on either side of the vehicle body portion of the tractor near the driver's seat behind the front portion of the vehicle body, and on one of the lower ends of the frame of the front loader. The other side has an irregularly shaped hook fixed thereto that can engage with the pin, and the irregularly shaped hook has an opening in which the pin engages, and a hook that can be connected to the irregularly shaped hook by moving the tractor. A guide groove is formed that guides the pin to the opening of the irregularly shaped hook when engaged, and the pin
It is characterized in that it can be either locked or unlocked with the odd-shaped hook depending on its angular position.

(Effects of the Invention) In the front loader mounting device of the present invention having the configuration described above, the front loader is substantially mounted on the tractor near the driver's seat on the body of the tractor and on the frame of the front loader. This is achieved by a pin and an irregularly shaped hook provided at the lower end, and the pin is configured to be either locked or unlocked with the irregularly shaped hook depending on its angular position. Therefore, the driver can prepare or finish the loading and unloading of the front loader on the tractor while sitting in the driver's seat, which improves work efficiency.

(Embodiment) A device for attaching a front loader to a tractor according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a tractor, and a front loader 10 is mounted on this tractor 1. The tractor 1 has a vehicle body 2, and a driver's seat 3 is provided approximately in the center of the vehicle body 2. On the side of the vehicle body 2 slightly in front of the driver's seat 3, that is, at a position on the side of the vehicle body 2 where the driver can operate from the driver's seat, a deformed pin 4 extending horizontally outward in the lateral direction is mounted on a bearing 5. and is rotatably supported around its central axis. This oddly shaped pin 4
has a cylindrical shape as a whole, but for the purpose of explanation later, as shown in FIG. 2, a notch 4a is provided in the center to form a thin wall portion 4b. A shaft 7 is fixed to both sides of the front end of the vehicle body 2 by mounting members 6, and the shaft 7 extends laterally outward from the side portions of the vehicle body 2. In FIG. 1, the reference numeral 8 indicates an exhaust pipe for exhausting air from an engine (not shown).

On the other hand, the front loader 10 has a frame 11 that extends substantially vertically in a normal state, and a lift arm 1 is provided in the upper part of the frame 11.
2 is pivotally mounted at its base. This lift arm 12 extends long in front of the tractor 11, and has a cargo handling section at its tip, that is, a bucket 13.
is installed. A bracket 14 is provided in the middle of the lift arm 12, and a double-acting hydraulic cylinder device, that is, a lift cylinder 15, which has one end rotatably attached to the lower end of the frame 11, is mounted on the bracket 14. It is rotatably attached at the other end. Therefore, by extending and contracting the lift cylinder 15, the lift arm 12 can be rotated up and down.

The bracket 14 of the lift arm 12 includes:
An upwardly extending link 16 is pivotally mounted and is connected to the bucket cart 13 by a link rod 17. A double-acting hydraulic cylinder device, ie, a dump cylinder 18, whose one end is pivotally connected to the frame 11, is further pivotally connected to the link 16 at the other end.
As the dump cylinder 18 expands and contracts, the bucket 13 rotates up and down. A frame stay 19 is further fixed to the frame 11, and as will be explained in detail later, when the front loader 10 is separated from the tractor 1 as shown in FIG. 10 in an upright state together with a lift arm 12 having a bucket 13 attached to the tip thereof, and a horizontal portion 19a that extends forward from the frame 11 almost horizontally, and a horizontal portion 19a that is fixed to the tip and extends approximately vertically from there. It has a vertical portion 19b extending downward in the direction.

A modified hook 20 that can engage with a modified pin 4 pivotally supported on the vehicle body 2 is fixed to the lower end of the frame 11. This strange hook 2
0 extends diagonally rearward and downward of the frame 11, and near its upper end is formed a substantially circular opening 21 having a diameter slightly larger than the diameter of the irregularly shaped pin 4 so that the irregularly shaped pin 4 can be engaged therewith. has been done. The irregularly shaped hook 20 further includes, from the opening 21,
A guide groove 22 is formed that extends downward in the direction in which the hook 20 extends. This guide groove 22 is open at the lower end of the hook 20, and is adapted to guide the irregularly shaped pin 4 into the opening 21 from this lower end. The width of this guide groove 22 is smaller than the diameter of the opening 21, but slightly larger than the thickness of the thin portion 4b of the irregularly shaped pin 4.
Therefore, the irregularly shaped pin 4 is guided by the guide groove 22 at the thin wall portion 4b and is inserted into the opening 21.
After being engaged with the opening 21, if the opening 21 is rotated 90 degrees, the opening 21 cannot be pulled out. Therefore, when the front loader 10 is separated from the tractor 1, it is necessary to return the irregularly shaped pin 4 to its original angular position.

A recessed portion, ie, a hook portion 23, which can be engaged with the shaft 7 fixed to the vehicle body 2, is formed on the rear side near the lower end of the vertical portion 19b of the frame stay 19. The formation position of the hook portion 23 and the stay 19 are such that when the irregularly shaped pin 4 engages with the opening 21 of the irregularly shaped hook 20, the hook portion 23 can engage with the shaft 7. The length etc. of are selected.

The attachment and detachment of the front loader 10 to the tractor 1 will be described below with reference to FIGS. 4 to 9.

During loader work, that is, when the front loader 10 is attached to the tractor 1, the irregularly shaped pin 4
is in the angular position shown in FIG. 4 and in a locked state. At this time, the hook portion 23 provided on the frame stay 19 is engaged with the shaft 7.

To remove the front loader 10 from the tractor 1, first rotate the irregularly shaped pin 4 by approximately 90 degrees as shown in FIG. Since the pin 4 is provided near the driver's seat, the irregularly shaped pin 4 can be rotated without the driver getting off the seat. As a result, the irregularly shaped pin 4 becomes detachable from the hook 22. Thereafter, when the lift cylinder 15 is gradually extended, the frame 11 uses the shaft 7 as a fulcrum and the irregularly shaped pin 4
Slide and move forward while climbing up. When the frame 11 moves forward in this way, the hook 23 comes off the shaft 7, and the front frame stay 19 descends using the rear modified hook 20 and modified pin 4 as fulcrums, as shown in FIG. Go. When the frame stay 19 descends downward in this way and the lower end of the frame stay 19 lands on the ground G as shown in FIG. 8, this lower end is used as a fulcrum,
Furthermore, the lower end of the frame 11, that is, the irregularly shaped hook 2
0 floats up, and the tractor 1 can be moved backwards. After this, when the tractor 1 is moved backward, the front loader 10 automatically separates from the tractor 1. The above operation is schematically shown in FIG. 9. Note that in FIG. 9, symbols A to E indicate the order of detachment operations.

The front loader 10 can be attached to the tractor by reversing the above order.

Here, in the above embodiment, the shaft and the irregularly shaped pin are arranged on the vehicle body side of the tractor, and the hook and the irregularly shaped hook that engage with them are arranged on the front loader side, but the present invention is not limited to this. do not have. For example, contrary to the above embodiment, it is of course possible to arrange the shaft and the irregularly shaped pin on the front loader side, and to arrange the hook and irregularly shaped hook that engage with them on the vehicle body side of the tractor.

FIGS. 10 to 14 show how to attach and detach the front loader in the mounting device configured as described above. As shown in the figure, in this example,
A shaft 7 extending laterally inward is fixed to the inner side surface of the vertical portion 19b of the frame stay 19, and a hook portion 2 that can be engaged with the shaft 7
3 are formed on both sides of the front end of the tractor body. Further, at the lower end of the frame 11, a modified pin 4 extending laterally outward is rotatably supported via a predetermined mounting member, and a modified hook 20 that can be engaged with the modified pin 4 is attached to the tractor. They are located on both sides of the vehicle slightly in front of the driver's seat.
Here, the irregularly shaped hook 20 is arranged so that its guide groove 22 is open at the upper end, and the hook portion 23 is formed so that the shaft 7 is engaged from the front side of the vehicle body. There is.

Even in the embodiment configured in this manner, the work of attaching and detaching the front loader is carried out by the operations shown in FIGS. 10 to 14, which correspond to FIGS. 4 to 8 in the previously described embodiment. be able to.

[Brief explanation of drawings]

Fig. 1 is a side view showing a front loader incorporating a mounting device according to an embodiment of the present invention and a tractor installed, Fig. 2 is a perspective view showing a deformed pin, and Fig. 3 is a front loader and a tractor installed. Side view showing the tractor in a detached state, Figures 4, 5, and 6
7, 8 and 9 are explanatory diagrams showing the operation of detaching the front loader from the tractor,
FIG. 10, FIG. 11, FIG. 12, FIG. 13, and FIG. 14 are explanatory views showing the operation of separating the front loader from the tractor in other embodiments of the present invention. 1...Tractor, 2...Vehicle body, 3...Driver's seat,
4... Irregular pin, 7... Shaft, 10... Front loader, 11... Frame, 12... Soft arm, 15... Soft cylinder, 19... Frame stay, 20... Irregular hook, 23... Hook Department.

Claims (1)

[Claims] 1 a frame extending substantially vertically, a lift arm whose base is pivotally connected to the upper part of this frame;
a hydraulic cylinder device having one end pivotally connected to the lift arm and the other end being pivotally connected to the lower portion of the frame, and a horizontal portion having a base end fixed to the lower portion of the frame and extending forward from there; A mounting device for attaching a front loader to a tractor, which includes a frame stay and a vertical part extending downward from the tip of the part, the front loader being attached to either side of the front part of the vehicle body of the tractor or the rear side of the vertical part of the frame stay. has a shaft fixed thereto, and the other side is provided with a hook that can be engaged with the shaft; A pin is rotatably supported on one of the lower ends of the frame of the front loader, and a modified hook capable of engaging with the pin is fixed to the other end. An opening with which the pin engages is formed, and a guide groove is formed to guide the pin to the opening of the irregularly shaped hook when the tractor is moved and the irregularly shaped hook engages with the pin. 1. A front loader mounting device for a tractor, characterized in that the front loader is capable of being either locked or unlocked with the odd-shaped hook depending on the situation.