JPS6115693Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lifting device for a walk-behind rice transplanter, and more specifically, in a walk-behind rice transplanter equipped with only running wheels, a swing case is attached to the machine so that it can move up and down. In order to raise and lower the aircraft by moving it up and down, the lifting device is placed in a well-balanced manner with respect to the aircraft, the lifting device and the swing case are connected via a leaf spring, and the shock absorbing mechanism is extremely simple. It is structured.

The embodiment shown in the drawings will be described below. In the drawings, reference numeral 1 denotes a body frame of a rice transplanter, and the body frame 1 includes a transmission case 3 to which an engine 2 is attached on the upper surface, and a transmission case 3 extending rearward from both left and right ends of the transmission case 3. A traveling transmission case 6 formed integrally with the transmission case 3, which is configured in a U-shape in plan with a pair of left and right hollow side frames 4 and 5, has a transmission case 6 extending rearward between the two side frames 4 and 5. The front end of the swing case 7 is rotatably pivoted, and a running wheel 8 is provided at the tip of the swing case 7 and is located on the center line in the width direction of the vehicle body frame 1. It is rotationally driven by the traveling transmission case 6 via a chain (not shown) in the swing case 7.

Seedling planting cases 9 and 10 are fixed to the rear ends of both side frames 4 and 5, respectively, and the two seedling planting cases 9 and 10 are connected by a gate-shaped connecting frame 11, making the whole lightweight. The vehicle body frame 1 is configured with
Furthermore, a wheel lifting device 12 (described later) is provided between the swing case 7 and the side frame 4, and the wheels 8
By moving the rice transplanter up and down, the entire rice transplanter can be raised and lowered.

Reference numerals 13 and 14 indicate a pair of left and right operating handles extending rearward from the seedling planting cases 9 and 10, and the operating handles 13 and 14 are bent in an upwardly inclined shape, and the upper surface of the inclined portion has a A rear-tilting seedling stand 17 is provided which is movably supported laterally to the left and right by a guide rail 15 and a rail mechanism 16 mounted horizontally between both handles. Both handles 13, 14 at the location
The transverse feed shaft 18 has a reciprocating thread groove on the outer periphery.
is pivotally supported parallel to the moving direction of the seedling support 17, and by engaging the boss body slidably fitted on the lateral feed shaft 18 with the seedling support 17, rotation of the lateral feed shaft 18 The seedling platform 17 is configured to reciprocate from side to side for horizontal feeding, and is further provided with a vertical feeding mechanism for vertically feeding the seedling pine at the end of the horizontal feeding of the seedling platform 17. The signal is transmitted via a transmission mechanism in a chain case 19 extending rearward from the attached case 9.

Swing-type seedling planting mechanisms 20 and 21 are provided at the inner ends of both seedling planting cases 9 and 10, respectively, and a seedling mounting stand 17 is provided.
It is configured to reciprocate between the seedling outlet 22 in the guide rail 15 at the lower end and the field area.

Reference numerals 23 and 24 denote a pair of floats located on the left and right sides of the wheel 8 and at the bottom of the side frames 4 and 5 and the seedling planting cases 9 and 10. The rear parts of the floats 23 and 24 are attached to the bases of the handles 13 and 14 via planting depth adjustment rods 25, and the front ends are connected to the side frames 4 and
5 via a link 26 so as to be movable up and down.
The inner surface of the 24 has a flattened portion 27, 2
8 is integrally provided, and seedlings are planted at the rear portions of each of the seedling planting mechanisms 20, 21.

The base end of a hydraulic cylinder 30, which is disposed so that the piston shaft 29 is substantially parallel to the swing case 7, is pivoted to the side frame 4 on the opposite side of the swing case 7 with the running wheels 8 in between.
A leaf spring 33 is provided on an arm 32 which is movable up and down and projects laterally from the swing case 7 across the front side of the running wheels 8 in the left and right direction, and a leaf spring 33 is provided in an upwardly projecting manner.
When the tip of this leaf spring 33 is connected to the piston shaft 29 of the hydraulic cylinder 30 and the piston shaft 29 is pulled into the hydraulic cylinder 30, the swing case 7 moves downward, and the traveling wheels 8 are lowered relative to the fuselage frame 1. The aircraft body is configured to be able to elastically move up and down by means of a wheel lifting device 12.

In this configuration, if seedling mats are supplied onto the seedling platform 17 and the wheels 8 and the seedling planting mechanisms 20 and 21 are driven by starting the engine 2, the rice transplanter will
While moving forward, the seedling platform 17 is reciprocated from side to side by the rotation of the transverse feed shaft 18, and
The seedlings on the seedling table 17 are placed on the seedling planting mechanism 2 that swings up and down.
After each plant is divided by 0 and 21, it is planted sequentially along two rows in a field that has been leveled with the leveling sections 27 and 28 of the floats 23 and 24.

During this rice planting work, when the plowing platform in the field is deep, the hydraulic cylinder 3 in the lifting mechanism 12
If the piston shaft 29 is retracted within 0, the wheel 8 will be lowered, and the height H from the bottom surface of the floats 23, 24 to the wheel 8 will be increased. By rotating the swing case 7 upward and lowering the height H, the float 2 relative to the field
The ground pressure of 3 and 24 is adjusted to be approximately constant,
In addition, when changing direction at the edge of a ridge, crossing a ridge, or running on the road, by operating the lifting device 12 and lowering the wheels 8 greatly, the aircraft can run without touching the floats 23 and 24 to the ground. It is to make it.

In the present invention, in a so-called one-wheel walk-behind rice transplanter in which the only running wheel is arranged at the center in the width direction of the machine body, the swing case 7 to which the running wheel 8 is attached and the hydraulic cylinder 30 that drives the swing case up and down are arranged in the width direction of the machine body. Since the rice transplanter is arranged so as to be distributed between the left and right sides with respect to the directional center, the total weight of the rice transplanter is well balanced on the left and right sides, and the handles 13 and 14 are easier to operate, especially when turning the machine. Furthermore, one end of the leaf spring 33 is directly connected to the piston shaft 29 of the hydraulic cylinder 30, and the other end of this leaf spring is attached to the arm 32 of the swing case 7, so that the leaf spring part can be easily operated without using additional parts such as a bell crank lever. At this time, the longitudinal direction of the leaf spring 33 is appropriately tilted in the vertical direction with respect to the line connecting the pivot 34 of the swing case 7 and the running wheel shaft 35, and the leaf spring 33 is made to protrude upward. When the leaf spring 33 and the hydraulic cylinder 30 are arranged so that the direction of the larger amount substantially coincides with the direction of the protrusion and retraction of the piston shaft 29,
This allows the buffering effect of the leaf spring 33 to be maximized.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a walking rice transplanter, and FIG. 2 is a plan view thereof. 1...Vehicle frame, 4, 5...Side frame, 7...Swing case, 8...Wheel, 13,
14...handle, 12...lifting device, 30...
Hydraulic cylinder, 29... piston shaft, 33... leaf spring.

Claims (1)

[Scope of utility model registration request] In a walk-behind rice transplanter in which the only running wheel is arranged at the center in the width direction of the machine body, the swing case to which the running wheel is attached and the hydraulic cylinder that drives the case up and down are distributed to left and right positions with respect to the width direction center of the machine body. What is claimed is: 1. A lifting device for a walk-behind rice transplanter, wherein the hydraulic cylinder and the swing case are connected via a leaf spring.