JPH052012Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a walking type tiller used when leveling a field with a walking type tiller when performing work such as sowing or transplanting. This invention relates to a rear cover device for the tilling section of a tiller.

(b) Conventional technology Land leveling work using a walk-behind tiller is accomplished by equipping the drive wheel shaft of the tiller with a cage wheel and towing a rake behind it to level the ground, and using a tiller body equipped with paddy wheels. A means of leveling the ground by attaching a rotary tilling section with ordinary tilling claws to the rear part and attaching a leveling plate to the rear part, and a soil crushing or puddling rotor to the tilling section attached to the rear of the tiller body, which is equipped with paddy wheels. This is done by hanging a rear cover at the rear of the tiller and leveling the ground. This method is more commonly used because it has superior leveling accuracy compared to other methods.

As shown in FIG. 4, the conventional ground leveling means by hanging the rear cover has a fulcrum shaft 102 installed at the rear end of the tiller frame 101 that can freely move up and down the front upper end of the rear cover 103. pivoted to,
The rear cover 103 is configured to swing in an arc around the fulcrum shaft 102 to adjust the height of the rear cover from the ground.

(c) Problems to be solved by the invention Therefore, in the conventional model, the angle of the rear cover changes greatly as shown in α1 and α2 depending on the adjustment position of the height above the ground, and the toes of the operator walking behind Since the spacing also changes greatly as shown in L1 and L2, it may cause a difference in the leveling accuracy,
There was a problem in that it interfered with the operator's ability to follow the operator's walking.

In addition, for a rotary tiller unit that is attached to a regular tractor with a three-point link, a rear cover is provided so that the angle and position of the ground contact area do not change, as described in, for example, Japanese Patent Application Laid-Open No. 55-74703. In this case, the rear cover, which is attached to the rear end of the tillage cover with a long hole structure and can be moved up and down, is attached to a special tail wheel support that rotates in an arc. The structure was extremely complex, and the tilling section of a walk-behind tiller was difficult to move because the rear cover was moved by converting the circular arc movement of the tail wheel support into an inclined movement using a special link. It was difficult to apply this method to the rear cover.

The present invention was made in view of the above-mentioned problems with conventional products, and its purpose is to provide a simple structure suitable for implementation in the rear cover of the tilling section of a walk-behind tiller. To provide a rear cover device for a tilling section of a walk-behind tiller, which is improved and devised so that the angle and the distance between the toes of an operator hardly change when adjusting the height above the ground.

(d) Means for Solving the Problems In order to achieve the above object, the rear cover device of the present invention includes tail wheel support tubes 13 and 15 that move up and down linearly by handle operation, and a retainer parallel to the tail wheel support tubes. In a tilling section for a walk-behind tiller, a tail wheel lifting support section C consisting of a tube and a rod-shaped body 17 fitted into the tube so as to be vertically movable is installed at the rear end of the tiller frame B. , a rear cover support 18 is installed across the lower end of the inner cylinder of the tail wheel support cylinder and the lower end of the rod-shaped body, and the rear cover support 1
The front upper part of the rear cover 20 is rotatably pivoted to a rear cover mounting fulcrum shaft 19 located at the joint between the rear cover 8 and the rod-shaped body 17, and the rear cover 20 is connected between the rear back surface of the rear cover 20 and the rear end of the rear cover support 18. are connected by a hanger rod 22 equipped with a spring 23 that presses the rear cover downward.

(e) Examples Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall side view of a walk-behind tiller incorporating a rear cover device according to the present invention, and FIG. 2 is a plan view of essential parts of the walk-behind tiller.

The traveling vehicle body A of the walk-behind tiller has paddy wheels 3, 3 fitted to drive wheel axles 2, 2 at the bottom of the traveling mission case 1 located at the center in the longitudinal direction. An engine 5 is mounted on a frame 4 that extends to the top, and a control handle 6 is installed rearward and upward from the traveling transmission case, and a tilling section is connected to the traveling transmission case at the lower part of the base of the steering handle. It is equipped with a utility hitch 7 and is constructed in the same manner as the conventional one.

The tiller frame B, which is detachably attached to the tiller connecting hitch 7, includes a tiller case 8 housing a tiller transmission mechanism that is uniaxially interlocked in the traveling mission case 1, a beam 9, and a tiller cover 1.
0, etc., and the tilling shaft 11 at the lower end of the tilling case 8 is equipped with a rotary tilling claw shaft cylinder (soil crushing or puddling rotor, R).

A tail wheel lifting support part C is installed at the rear end of the beam of the tiller frame B.
Outer cylinder 1 is attached to 2 so as to be movable and fixed in the vertical direction.
3, and an inner cylinder 15 that is vertically slidably attached to the outer cylinder 13 and moved vertically by a rotating handle 14 is installed at the rear end of the beam. Holding tube 1 parallel to the support tube
6 is installed at a location appropriately spaced forward from the tail wheel support tube, and is constituted by the tail wheel support tube and the holding tube.

Then, the rear cover support 18 is attached so as to connect the lower end of the inner cylinder 15 in the tail wheel support cylinder and the lower end of the rod-shaped body 17 that is fitted into the holding cylinder 16 so as to be freely movable up and down. A rear cover attachment fulcrum shaft 19 is installed at the connection point between the rear cover support 18 and the rod-shaped body 17.

The rear cover 20 is attached to the rear cover mounting fulcrum shaft 19.
The rear cover 20 is formed to have a downwardly convex curved shape when viewed from the side, and has attachment parts 21, 21 provided on the front upper rear surface.
is rotatably fitted and attached to the rear cover attachment fulcrum shaft 19, and the rear cover 20
The lower end of a hanger rod 22 is pivotally attached to the rear back surface, and the upper part of the hanger rod, which is interposed with a spring 23 that presses the rear cover downward, is connected to the rear cover support 1.
It is pivotally connected to the rear extension part of 8 so as to be movable up and down.

As a result, the front upper part of the rear cover 20 overlaps with the lower part of the covering area of the tillage cover 10, and it moves up and down in a straight line by operating the tail wheel lifting support part C, and the rear cover support 18
The ground contact side can swing up and down about the rear cover attachment fulcrum shaft 19 located at the connection point of the rod-shaped body 17 and the rear cover attachment fulcrum shaft 19.

Note that by connecting the rear lower surface of the tillage section cover 10 and the upper end of the rear cover 20 with an elastic plate or the like (not shown) that can follow the vertical movement of the rear cover, it is possible to more reliably prevent the soil from scattering backwards. can do.

Although not shown, in order to accommodate different rotation systems such as a crushing rotor or a puddling rotor attached to the tillage shaft 11, for example, the rear cover support 18 may be made to be able to be moved back and forth. It is better to take the following measures.

The symbols l ₁ and l ₂ indicate the toe spacing in the device according to the embodiment of the present invention, and β1 and β2 indicate the rear cover angle.

(f) Function When leveling the ground with a walk-behind cultivator equipped with the rear cover device as described above, the inner cylinder 15 is moved up and down by operating the rotary handle 14 to adjust the height of the rear cover 20 from the ground to the desired height. When adjusting the adjustment, the rear cover mounting fulcrum shaft 18 is located directly below the rod-shaped body 17 and moves linearly in the vertical direction, so the entire rear cover device is adjusted as follows.
It moves up and down in parallel rather than in a circular arc, and the operating angle is β1≒β2 no matter what adjustment position it is in. Also, the distance between the operator's toes becomes _l1 ≒ _l2 , so the leveling accuracy hardly changes. Moreover, it does not make it difficult for the operator to operate the vehicle.

(G) Effect of the invention The rear cover device of the walk-behind tiller according to the invention includes tail wheel support tubes 13 and 15 that move up and down linearly by handle operation, a holding tube parallel to the tail wheel support tube, and a holding tube that can move up and down. A rod-shaped body 1 inserted into
In the tilling section for a walk-behind tiller, which is constructed by installing a tail wheel lifting support section C consisting of The rear cover support 18 is mounted across the lower ends of the body, and the front upper part of the rear cover 20 is rotatably pivoted to a rear cover mounting fulcrum shaft 19 located at the joint between the rear cover support 18 and the rod-shaped body 17. At the same time, the rear back of the rear cover 20 and the rear end of the rear cover support 18 are connected by a hanger rod 22 equipped with a spring 23 that presses the rear cover downward. The rear cover 20 moves up and down in a straight line according to the operation, and no matter what adjustment position it is in, the operating angle of the rear cover and the distance between the operator's toes are kept approximately the same, so that the leveling accuracy remains unchanged at all times. , it does not make operation difficult for the operator, and this advantage is achieved by utilizing the tail wheel lifting support part C that is originally provided in the tilling part of a walk-behind tiller. It is suitable for implementation in a walk-behind cultivator because it can be carried out without the need for additional steps, has a simple structure, and is easy to operate.

The front upper part of the rear cover 20 is pivoted to the rear cover mounting fulcrum shaft 19 located at the joint between the rear cover support 18 and the rod-shaped body 17, so that the front upper part of the rear cover overlaps the lower side of the covering area of the tillage cover 10. This has the effect of reducing the amount of tilled soil being blown away by the operator.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a walk-behind tiller equipped with a rear cover device according to the present invention, Fig. 2 is a plan view of essential parts of the walk-behind tiller, and Fig. 3 is an explanatory diagram of the operation of the inventive device. FIG. 4 is an explanatory diagram of a conventional structure. C... Tail wheel lifting support part, B... Tiller machine frame,
13... Outer cylinder, 15... Inner cylinder, 17... Rod-shaped body,
18...Rear cover support body, 19...Rear cover mounting fulcrum shaft, 20...Rear cover, 22...Hanger rod, 23...Spring.

Claims (1)

[Scope of utility model registration request] A tail wheel elevation support part C is made up of tail wheel support tubes 13 and 15 that move up and down linearly by handle operation, a holding tube parallel to the tail wheel support tube, and a rod-shaped body 17 fitted into the holding tube that can freely move up and down. , in a tilling section for a walk-behind tiller installed at the rear end of the tiller frame B, a rear cover is installed across the lower end of the inner cylinder of the tail wheel support tube and the lower end of the rod-shaped body. Attach the support body 18, and connect the rear cover support body 18 and the rod-shaped body 1.
Rear cover mounting fulcrum shaft 1 located at the joint with 7
At 9, a hanger rod 22 is rotatably attached to the front upper part of the rear cover 20 and is provided with a spring 23 that presses the rear cover downward between the rear back surface of the rear cover 20 and the rear end of the rear cover support 18. A tilling section rear cover device of a walk-behind tiller, characterized in that: