JPH0351388Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a front loader operating device that can be attached to and detached from a tractor.

(Prior art) For example, a front loader that can be attached to and detached from an agricultural tractor has a pair of left and right booms that are pivotally supported at the tip so that a bucket can be dumped, and the bases of a pair of left and right booms are pivoted to a pair of left and right columns. The upper parts of the boom are releasably connected by a connecting rod, and the lower part of each support is removably attached to a mounting base fixed to the tractor body. It is constructed by installing a control box on one of the pillars for adjustable control.

When attaching or detaching this front loader to the tractor body, the connecting rod hits the muffler, so remove it from one of the columns to release the connection, and with the bucket on the ground, operate the boom cylinder operating lever on the control box. By expanding and contracting the boom, the column is raised and lowered and attached to and detached from the mounting base.

(Problems to be Solved by the Invention) In the operating device of the front loader, when the control lever is rotated, the column also moves up and down, so it is difficult to adjust the operating speed to an appropriate or small level, and the boom and column may move suddenly, creating a dangerous situation, and the support column and mounting base may collide when installed.

(Means for Solving the Problems) The present invention provides an actuating member 27 on one of the supports 8, which is activated by the release of the connecting rod 15 that is released when the front loader is attached or removed. The boom cylinder operating lever 2 is connected to an actuating member 29 near the control box 20, which is operated by the actuating member 29.
By providing a restraining member 30 that fits into the motor 3 and limits its movement within a very slow speed range, the problems of the prior art described above can be solved.

That is, the specific structure of the problem-solving means of the present invention is characterized by a pair of left and right booms 1 that are pivotally supported at their tips to be able to dump one bucket 11.
The base of the tractor 0 is pivotally supported on a pair of left and right columns 8, and the upper parts of the left and right columns 8 are releasably connected by a connecting rod 15, and the lower part of each column 8 is detachably attached to a mounting base 4 fixed to the tractor body 1. A control box 20 is installed on one of the pillars 8 to control the boom cylinder 12 that raises and lowers the boom 10 in a manner that allows the operating speed to be adjusted by adjusting the amount of operation of the operating lever 23.
In a front loader in which one of the pillars 8 is provided with an actuating member 29 that is activated by disconnecting the connecting rod 15, a device that is connected to the actuating member 29 and that is connected to the actuating member 29 in the vicinity of the control box 20 is provided. Yotsutte boom cylinder operating lever 2
The point is that a restraining member 30 is provided which fits into the motor 3 and limits its movement within the slow speed range.

(Function) When the connecting rod 15 is released from the connection when separating the front loader 2 from the tractor body 1, the actuating member 29 is actuated to the position indicated by the two-dot chain line in FIG. 1 by the action of the spring 32. Tight restraint member 3
0 also advances to the control lever control position.

By moving the restraining member 30 to the restraining position, the restraining part 33 sets the operation amount of the operating lever 23 from the operational range D in which the spool valve 21 can be fully opened to a restraining range E that limits the spool valve 21 to approximately half open, and the boom cylinder 21 operating speed is kept low, boom 10
Prevent the device from rising and falling rapidly.

When the connecting rod 15 is brought into the connected state, the actuating member 29 is pushed into the opening 31, and the restraining member 30 connected thereto is retreated from the position where it restrains the operating lever 23, so that the operating amount of the operating lever 23 becomes the full amount. .

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the embodiment shown in FIGS. 1 to 5, reference numeral 1 denotes a tractor body equipped with a front loader 2, which has a pair of left and right mounting bases 4 behind the front wheels 3, and a brace receiving member at the front of the front axle frame 5. 6 is fixed.

The front loader 2 includes a pair of left and right columns 8, a boom 10 whose base is pivotally attached to the upper part of each column 8 via a pivot 9, and a bucket truck pivoted to the tips of the left and right booms 10 so as to be dumpable. 11, a boom cylinder 12 provided between the lower part of the support column 8 and the middle of the boom 10, and a boom cylinder 12 provided between the middle of the boom 12 and the bucket 1.
1, a bucketed cylinder 13 provided between the
Brace 14 protrudes forward from the middle of pillar 8
and a connecting rod 15 that connects the upper parts of the left and right columns 8.

The front loader 2 has a recess 1 at the lower end of the support column 8.
7 is engaged with the receiving pin 18 of the mounting base 4, the connecting pin 19 is passed through the lower part of the column 8 and the mounting base 4, the tip of the brace 14 and the brace receiving member 6 are connected, and both ends of the connecting rod 15 are connected. It is connected to the left and right struts 8 and mounted on the tractor body 1.

A control box 20 that can be operated from the tractor body 1 and from the ground is mounted on one of the left and right struts 8, and the control box 20 is connected to the boom cylinder 12 and the bucket cylinder through a hose. It is now possible to send it to 13.

This control box 20 is provided with a spool valve 21 for operating the boom cylinder 12 and a spool valve 22 for operating the bucket cylinder 13. When the spool valve 21 is operated and rotated in the left-right direction B, the spool valve 22 is operated. Each spool valve 21, 22 changes the amount of spool in and out depending on the amount of operation of the operating lever 23, and each cylinder 12, 13
The operating speed is adjustable.

The connecting rod 15 is formed of two plates or one rod or pipe, and is connected via a pin 24 implanted in the left and right supports 8. By separating one end from the pin 24, the other end can be removed. Rotate around the end to release the connection, or attach both ends with pin 2.
4 to avoid hitting the muffler 25 when the front loader 2 is removed from the tractor body 1.

A vertical rotation shaft 28 is supported on one side of the column 8 to which the control box 20 is attached via a holder 27. An operating member 29 is mounted on the upper part of this rotation shaft 28, and an operating member 29 is mounted on the lower part of the rotation shaft 28. The restraining members 30 are each fixed.

The actuating member 29 is formed into a substantially L-shape in plan view, and is inserted into the interior of the support column 8, with its tip freely retractable from an opening 31 formed on the back surface of the support column 8.
The opening 31 is formed at a position where it is closed by the connecting rod 15 when connected. Therefore, connecting rod 1
When the actuating member 5 is in the connected state, the tip of the actuating member 29 is recessed into the opening 31, and when the actuating member 29 is in the disconnected state, the tip protrudes from the opening 31 by the tension of the spring 32.

The restraining member 30 has a substantially U-shaped restraining portion 33 in a plan view at its tip, and is applied with a rotational force clockwise in FIG. 1 by a spring 32. This restraining member 30 is interlocked with the rotation of the actuating member 29 due to the disconnection of the connecting rod 15, and operates so as to fit the restraining portion 33 into the operating lever 23.

The check member 33 reduces and limits the original boom cylinder operation range D of the operation lever 23 to a check range (low speed range) E, and when the operation lever 23 is operated in the operation range D, the spool valve 21
can be fully opened and the boom cylinder 12 can be operated at high speed, but in the check range E, the spool valve 21
can only be opened half-open, and the operating speed of the boom cylinder 12 is kept low (limited to within a very slow speed range).

The check section 33 advances to the check position and the operating lever 2
When limiting the operation amount in the boom cylinder operation direction A of No. 3, one direction of the bucket cylinder operation direction B is also limited. Since the bucket cylinder 13 is not operated when the front loader is attached or detached, even if the operation of the operating lever 23 in the B direction is restricted, there is no problem with the work, and furthermore, a small amount of operation in the B direction is allowed.

In the above embodiment, a hook part that engages with the pin 24 may be formed at the end of the connecting rod 15 on the detachable side, or the connecting rod 15 and the pin 24 may be arranged on the upper surface side of the support column 8. The spring 32 may be of a type that is fitted onto the rotating shaft 28, and the control box 20 may be attached to the outer surface of the support column 8, or the spool valves 21 and 22 may be operated using separate operating levers. It's okay.

The detachment operation of the front loader 2 in the above embodiment involves removing the connecting pin 19 to enable the column 8 to be detached from the mounting base 4, separating the brace 14 from the brace receiving member 6, and uncoupling the connecting rod 15 from the column 8. Then, from this state, the operating lever 23 is operated in the direction in which the boom cylinder 12 is extended.

In the front loader 2, the base of the boom 10 rises centering around the bucket belt 11 that is in contact with the ground, and while the bucket belt 11 is sliding forward, the support column 8 is disengaged upward from the mounting base 4. Furthermore, boom cylinder 1
When the loader 2 is extended, the tip of the brace 14 comes into contact with the ground and acts as a stand. When the tractor body 1 is moved backward in this state, the front loader 2 separates from the tractor body 1 while remaining in an upright position (Fig. 5). (double-dashed line).

When the connecting rod 15 is uncoupled, the actuating member 29
is activated, the check member 30 advances to the check position shown by the two-dot chain line in FIG.
The operating range of is set to check range E. As a result, even if the support column 8 rises while the operating lever 23 is being operated, the operating speed of the boom cylinder 12 can be kept low because the operating amount is limited.

When mounting the front loader 2, since the connecting rod 15 has been uncoupled in advance, the operating lever 23 can only be operated within the check range E, and the boom cylinder 1
2 has a lower operating speed and can be operated in the same way as the detachment operation.

6 and 7 show a comparative example of the present invention, in which the control box 20 has a first valve that operates the spool valve 22 for the bucket cylinder 12.
The first operating shaft 3 is fixed to the swinging member 36, swingably supports the front first swinging member 36, and swings in a direction perpendicular to the swinging direction to operate the boom cylinder spool valve 21. Second swinging member 38 to operate
A second operation shaft 40 is fixed to the swing shaft 39.

The first and second operating shafts 37 and 40 are parallel to each other, and the first operating shaft 37 projects above the box 20 and can be operated from above the tractor body 1 by connecting the operating lever 23. Second
The operating shaft 40 protrudes downward from the side of the box 20, and can be operated extremely easily from the ground by connecting the operating lever 23.
It is used to operate only the boom cylinder 12 during attachment and detachment.

One of the operating levers 23 is connected to the first and second operating shafts 3.
7, 40, and when attached to the first operating shaft 37, its operating range D
is the range in which the spool valve 21 can be fully opened, but when attached to the second operating shaft 40, the spool valve 21 can only be opened half-open in the restraint range E by the restraint member 30' protruding from the box 20. Become. The restraining member 30' can be two pins or a U-shaped plate.

This comparative example has the advantage that the control lever 23 can be easily operated from the ground compared to the above-mentioned embodiment, but it has the complication of having to change the mounting position of the control lever 23, and 23 is attached to the second operating shaft 40,
Another problem is that the bucket cylinder 13 cannot be operated at all.

(Effects of the invention) According to the invention described in detail above, the control box 20 is provided in the vicinity of the control box 20, which is connected in conjunction with the actuating member 29, and which is fitted into the boom cylinder operating lever 23 by the actuation of the actuating member 29. Since the restraining member 30 is provided to limit the movement within the slow speed range, if the connecting rod 15 is disconnected when the front loader 2 is separated from the tractor body 1, the boom cylinder 12 will not move even if the operating lever 23 is operated. It operates only within the slow speed range, and as a result, the boom 10
Furthermore, when the front loader 2 is attached to the tractor body 1, the movement of the operating lever 23 is restricted to within a very slow speed range by the restraining member 30, so that the rapid descent of the boom 10 is prevented. Therefore, the safety of attaching and detaching the front loader 2 can be improved, and collision between the support column 8 and the mounting base 4 can also be avoided.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a plan view of the main parts, Figure 2 is a perspective view of the main parts, and Figure 3 is a partially sectional rear view of the front loader. Fig. 4 is an explanatory diagram showing a state in which the operation amount of the operating lever is limited, Fig. 5 is a side view of the front loader attached to the tractor body, Figs. 6 and 7 are comparative examples of the present invention, and Fig. 6 is a FIG. 7, which is a perspective view of the control box, is an explanatory diagram showing the functions of the operating lever. 1...Tractor body, 2...Front loader,
4...Mounting base, 8...Strut, 10...Boom, 1
1...bucket, 12...boom cylinder, 15
...Connection rod, 20...Control box, 2
DESCRIPTION OF SYMBOLS 1, 22... Spool valve, 23... Operating lever, 29... Operating member, 30... Checking member, 31
...Opening, 33...Checking section.

Claims (1)

[Claim for Utility Model Registration] The bases of a pair of left and right booms 10, each of which has a bucket 11 pivotably supported at its tip so as to be able to dump, are pivoted to a pair of left and right columns 8, and the upper parts of the left and right columns 8 are connected. Connecting rod 1
5, and the lower part of each strut 8 is removably attached to a mounting base 4 fixed to the tractor body 1, and a boom cylinder 12 that raises and lowers the boom 10 is operated by adjusting the operating amount of an operating lever 23. Control box 2 that controls speed freely
0 is provided on one of the pillars 8, and an actuating member 2 that is actuated by disconnecting the connecting rod 15 is provided on this one pillar 8.
In the front loader equipped with a boom cylinder control lever 23, a control box 9 is provided near the control box 20, which is interlocked with an operating member 29, and is fitted into the boom cylinder operating lever 23 by the operation of the operating member 29 to limit its movement within a slow speed range. restraining member 30
An operating device for a front loader, characterized in that it is provided with.