JPH0444679Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a cargo handling device for a tractor in which a lift arm of a loader detachably attached to an agricultural tractor is operated via a link mechanism.

(Prior art) Conventional cargo handling equipment for this type of tractor was
As described in Publication No. 51-49765, the base end of a lift arm, on which a work implement such as a bucket can be removably attached, is pivoted to the top of the base metal of the loader with a pin, and the lift arm is connected to a lift cylinder. The base metal is attached to the tractor.

(Problems to be solved by the invention) When carrying out cargo handling work using a loader, a large load is applied to a working device such as a bucket at the tip of the lift arm. Therefore, the farther the work implement is from the tractor, the more
The machine becomes unbalanced.

By the way, in the above-mentioned conventional tractor cargo handling device, the lift arm of the loader moves up and down using the pin at its base end as a fulcrum, so the working implement at the tip of the lift arm moves up and down in an arc centered on the pin. do.

Therefore, if you increase the reach at the height of the top of the work implement, that is, the damping reach,
Accordingly, there is a problem in that the maximum reach when the work implement is in a horizontal position with the base end pin of the lift arm increases, causing the machine to become unbalanced.

(Means for Solving the Problems) Therefore, in order to solve the above problems, this invention is to attach the frame 1 of the loader b to the tractor a in a removable manner, and attach one end of the upper link 2 to the upper part of the frame 1. , one end of the lift cylinder 4 with the piston rod 3 is attached to the lower part, one end of the lower link 5 is pivotally attached to the intermediate protruding tip part by shaft rods 6, 7, and 8, and the upper link is attached to the intermediate support 10 of the lift arm 9. The other end of the lower link 5 is pivotally connected to one arm of the lift arm 9 by shaft rods 11 and 12, respectively, and the other end of the lower link 5 is pivotally connected to one arm of the lift arm 9 and the other end of the lower link 5. Piston rod 3 per part
The other end of the lift cylinder 4 with the lift cylinder 4 is pivotally connected by a shaft rod, and the working device 13 is attached to the tip of the other arm of the lift arm 9 so as to be detachable and vertically movable.

(Embodiment) To explain the structure of an embodiment of this invention shown in the drawings, reference numeral 14 denotes a vehicle body of a tractor a. Hitches 15 and 16 are respectively fixed to the upper and lower rear ends of the vehicle body 14, and the upper hitches are A U-shaped locking metal 17 is provided within the housing 15, and the lower hitch 16 is formed into a hook shape.

1 is a T-shaped frame of rear loader b, with a cylinder 18 fixed to the upper part of the frame 1 and a horizontal shaft 19 attached to the lower part.
, hook its horizontal shaft 19 onto the lower hitch 16, fit the cylindrical body 18 into the latch 17, and insert the retaining pins 20 into the pin holes on both side walls of the upper hitch 15 and the hole in the cylindrical body 18. The frame 1 is removably attached to the tractor a by being removably inserted.

Reference numeral 13 indicates a removable bucket work implement whose lower part is pivotally attached to the tip of the other arm of the lift arm 9 with a pin 21, and 22 indicates a pin 2 at the intermediate portion of the other arm of the lift arm 9.
3, the dump link 22 and the upper part of the work implement 13 are connected by a connecting rod 24,
The receivers 10 are connected to each other by a dump cylinder 26 with a piston rod 25. Although not shown, the pressure oil generator of the tractor a, the lift cylinder 4, and the dump cylinder 26 are connected by a detachable pressure oil pipe 27. 28 is lift arm 9
29 is the tip of the lift arm when the conventional lift arm operates with the shaft 6 as the fulcrum, which corresponds to the length between the shaft 6 and the pin 21 when the work implement 13 is lowered to the ground. 30 is the lift arm when the conventional lift arm operates with the shaft 6 as the fulcrum, which corresponds to the length between the shaft 6 and the pin 21 when the work implement 13 is lifted to the highest position. This is an arcuate trajectory at the tip.

Next, its effect will be explained. As shown in FIG. 1, when the piston rod 3 of the lift cylinder 4 is advanced from the state where the work implement 13 is lowered to the ground, as the lift cylinder 4 rises, the lower link 5 pivots around the shaft 8 as a fulcrum and moves to the first position. While the tip of one arm of the lift arm 9 rises by rotating clockwise in the figure, the upper link 2 rotates counterclockwise in FIG. is shaft 1
2 as a fulcrum and rotates counterclockwise in Fig. 1.

Therefore, the upper link 2, one arm of the lift arm 9, and the lower link 5 perform a four-bar link movement with respect to the frame 1, and the tip of the lift arm 9
As shown by the dotted line in the figure, the work implement 13 is lifted up by moving upward along a deformed arc-shaped locus 28 having a radius larger than the circular arc 29 with the shaft rod 6 as the fulcrum.

At that time, when the work implement 13 is lifted to the highest level, it will be in the state shown in Fig. 2, so the damping reach is longer than the conventional loader in which the tip of the lift arm draws an arcuate trajectory 29. Also, the tip of the lift arm has an arcuate trajectory 30.
The maximum reach is shorter by length (n) than the loader that draws.

On the other hand, when the piston rod 3 of the lift cylinder 4 is moved backward in the opposite direction to the above, the upper link 2, one arm of the lift arm 9, and the lower link 5 perform a four-bar link movement in the opposite direction to the frame 1 to perform work. The lift arm 9 with the container 13 is lowered.

The lift cylinder 4 with the piston rod 3 is turned upside down, and the base of the cylinder 4 is attached to the lower part of the frame 1 by means of a shaft rod 7, and one arm of the lift arm 9 and the lower link 5 are attached to the piston rod 3.
The other ends may be pivotally connected by the shaft rods 12, respectively.

Further, only one arm of the lift arm 9 and the other end of the lower link 5 are pivotally connected by the shaft rod 12, and the pivot 1
Even if one arm of the lift arm 9 or the lower link 5 is pivotally connected to the lift cylinder 4 by a shaft separate from the shaft 12 in the vicinity of the second portion, the same effect as described above will occur.

On the other hand, if the upper and lower hits 15 and 16 are fixed to the front end of the vehicle body 14 of the tractor a and the loader b is attached thereto, the loader b can be made into a front loader.

(Effects of the invention) The tractor cargo handling device of this invention has the following remarkable effects.

(1) By moving the lift arm up and down while the fulcrum of the loader lift arm rises or falls, the maximum reach of the loader can be kept as short as possible to ensure reach at the highest height. (a) The machine is well-balanced and is beneficial for safety.

(b) Be able to lift heavy objects with confidence.

(c) Easy to handle and improve work efficiency.

(2) Since it is a link mechanism, the operation is light and smooth.
There is no risk of failure.

(3) It has a simple structure and can be manufactured easily and inexpensively.

[Brief explanation of drawings]

Figures 1 and 2 are side views of a loader according to an embodiment of this invention installed at the rear of a tractor, with one wheel on one side of the tractor removed and
The figure shows the working equipment lowered to the ground, and Figure 2 shows the working equipment raised to the highest height. FIG. 3 is a developed plan view of the loader in the state shown in FIG. 1. a...Tractor, b...Loader, 1...Frame, 2...Upper link, 3...Piston rod,
4... Lift cylinder, 5... Lower link, 6,
7, 8... Axis rod, 9... Lift arm, 1
1, 12... shaft rod, 13... working implement.

Claims (1)

[Scope of utility model registration request] A loader frame is removably attached to the tractor, one end of the upper link is pivotally connected to the upper part of the frame, one end of a lift cylinder with a piston rod is pivotally connected to the lower part of the frame, and one end of the lower link is pivotally connected to the intermediate projecting tip, respectively, by a shaft rod, The other end of the upper link is pivotally connected to the middle part of the lift arm, and the other end of the lower link is pivotally connected to one arm of the lift arm, and the one arm of the lift arm and the other end of the lower link are pivotally connected. A cargo handling device for a tractor, in which the other end of a lift cylinder with a piston rod is pivotally attached to the attachment part by a shaft rod, and a working implement is attached to the tip of the other arm of the lift arm so that it can be attached and detached and can be moved up and down.