JP2000157003A - Locking device for rear cover in rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device intended to be simplified in structure by positioning the pivot of a lock lever designed to lock a rear cover to a desirable position and the pivot of a control lever directed to longitudinally rotate a rotary cover on the same shaft. SOLUTION: This rotary tiller is obtained by connecting a rear cover to the rear end of a rotary cover via an intermediary cover so as to freely and longitudinally rotate around a tilling shaft, wherein a supporting shaft 26 rotatably and pivotably penetrates into a top mast of a pair of laterally positioned plates fixed to the upper section of the rotary tiller, wherein a control lever 31 for setting the rear cover in the operatively suitable position in a rotating manner is pivotably mounted on one side of the penetrably projected portion of the supporting shaft 26, and wherein a lock lever 33 for locking the rear cover to the proper position is pivotably mounted on the other side of the penetrably projected portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a rear cover in a rotary cultivator, and more particularly, to a turning fulcrum of a locking lever for locking the rear cover at a desired position and an operating lever for rotating the rotary cover back and forth. And a lock device for a rear cover formed on the same axis as the rotation fulcrum.

[0002]

2. Description of the Related Art Conventionally, a rotary cultivator mounted on the rear of a tractor has a rear cover connected to a rear end of the rotary cover via an intermediate cover. , A control lever is provided for rotating the rotary cover back and forth to set the rear cover at a position suitable for working conditions.

On the other hand, the rear cover has a function of detecting the tillage depth during the tillage work, and is used at the time of setting the tillage at the lower position to level the tillage mass or removing the rotary, or at the upper position. In some cases, it may be used for car washing and ridge filling work, or it may be set at an intermediate position and used for ridge work, for which purpose the suspension rod must be locked and the rear cover must be locked to the desired position. Therefore, a rotary lever is provided with a lock lever.

However, in the conventional rotary tilling machine, a rotation fulcrum of an operation lever for rotating the rotary cover back and forth and a rotation fulcrum of a lock lever for locking the rear cover at a desired position are separately provided. As a result, the number of parts increases, the structure becomes complicated, and a large space is required for mounting a support shaft serving as a rotation fulcrum, and the weight is increased.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made to solve the conventional problems, and the intention is to lock the rear cover at a desired position. The rotation fulcrum of the lock lever is configured on the same axis as the rotation fulcrum of the operation lever that rotates the rotary cover back and forth, so that the structure can be simplified, the number of parts can be reduced, the weight can be reduced, and the cost can be reduced. The lock of the suspension rod that suspends the rear cover can be ensured by operating the lock lever, and various operations performed using the rear cover in addition to detecting the plowing depth can be performed safely. An object of the present invention is to provide a locking device for a rear cover in a rotary tiller that can be used.

[0006]

According to a first aspect of the present invention, a rear cover is connected to a rear end portion of a rotary cover via an intermediate cover.
In a rotary cultivator in which the rear cover is rotatable back and forth about a cultivation axis together with a rotary cover and an intermediate cover, a support shaft is rotated on a top mast made of a pair of left and right plate members fixed on an upper portion of the rotary cultivator. A penetrating shaft is freely mounted, and an operation lever for turning and setting the rear cover to a position suitable for working conditions is pivotally mounted on one side of the penetrating protrusion of the support shaft. A lock lever for locking the rear cover at an appropriate position is pivotally mounted on the other side.

A second technical means employed in the present invention is that a lock pin is provided via a biasing ammunition at a rear end of a wire cable having a distal end connected to a lock lever, and the lock lever is operated to rotate back and forth. Thus, the lock pin can be engaged with and disengaged from a plurality of engagement holes formed in the axial direction of the suspension rod of the rear cover.

[0008]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 6, 1
Is a tractor, 2 is a rotary cultivator connected to the rear of the tractor 1, and the rotary cultivator 2 is provided with a gear case 3 fixed at the center of the fuselage, and has a substantially V-shaped top view when viewed from the side. Top mast 4 in which two side plates 4a and 4b made of two plate members are provided so as to face each other at a required interval.
Has been fixed. The top mast 4 has a front upper portion connected to an auto hitch 5 provided on the tractor 1 via a connecting pin 6, and a rear wheel upper portion for mounting a tail wheel, a ridge stand, etc. (not shown) on the rear side upper portion. A toolbar 7 is supported via a screw type adjusting device 8 so that the vertical angle can be adjusted.

Reference numeral 9 denotes a chain case disposed on one side of the machine body. The chain case 9 is fixed to one end of an arm 10 extending from the gear case 3 to the left and right. The tilling shaft 1 on which the tilling claws 12a are mounted by the side plate 11 fixed to the other end of the arm 10.
2 is supported, and the tilling shaft 12 is rotatably driven by a transmission mechanism housed in the chain case 9.

Reference numeral 13 denotes a cultivating claw 12 mounted on a cultivating shaft 12.
a rotary cover for covering the upper part of the rotation trajectory a.
a, and side plates 13b formed on both left and right sides thereof,
It is configured to be able to rotate back and forth about the tilling shaft 12. A reinforcing plate 14a is fixed to the upper surface of the central rear portion of the rotary cover 13, and a bracket 14 that supports the front and rear rotation of the rotary cover 13 via the reinforcing plate 14a is arranged such that the rear side is closer to the rear end of the rotary cover 13 than the rear end. It is fixed so as to project backward. The bracket 14 is formed by standing two side plates 14b and 14c formed of two plate members so as to face each other at a required interval.
Are formed with long holes 14d in the front-rear direction.

At the rear end of the rotary cover 13, an intermediate cover 15 made of a pipe having a substantially elliptical cross section is rotatably mounted, and at the rear end of the intermediate cover 15, a rear cover for detecting the plowing depth is provided. 16 extends rearward and downward.
A pair of side plates 17a, 1
7b is fixedly provided with a suspending bracket 17
A suspending rod 19 of the rear cover 16 is vertically movably supported via the bracket 17 and a bracket 18a including a pair of side plates 18a and 18b provided on the rear cover 16 side.

Reference numeral 20 denotes a bracket fixed to the upper surface of the central portion of the intermediate cover 15. The bracket 20 is a relatively thin plate material and has an opening 20a facing the rotary cover 13 in a U-shape in plan view. Are formed on both side plates 2
In the state where 0b and 20c are located outside the both side plates 14b and 14c of the bracket 14 of the rotary cover 13, the front end side is formed in the front and rear long holes 14d and 14d formed in the both side plates 14b and 14c of the bracket 14. And a mounting pin 22 for slidably supporting the rotation fulcrum of the intermediate cover 15 and rotatably supporting the front end of the rear cover 16 on the surface portion 20d on the closing portion side. It is fixed via the tool 23.

In the vicinity of the bracket 14, an inverted L is shown in a side view.
A support member 24 having a U-shape is fixedly provided.
Is provided with a rubber cushioning material 25. Cushioning material 25
When the intermediate cover 15 and the rear cover 16 are rotated forward together with the rotary cover 13, the gear cover 3 comes into contact with the gear case 3 to prevent rattling.

A support shaft 26 is rotatably mounted below the top mast 4 from the side toward the side plates 4a and 4b, and the support shaft 26 is supported by the side plate 4 of the top mast 4.
The base end of the operating arm 27 is fixedly located between a and 4b, and the distal end of the operating arm 27 has a base end between the side plates 14b and 14c of the bracket 14 of the rotary cover 13 via a pin 28. A pin 30 is attached to the tip of the connected rod 29.
Are connected via

On one side of the penetrating projecting portion of the support shaft 26, that is, on the side of the side plate 4b of the top mast 4, there is provided a connection which penetrates the support shaft 26 in a direction perpendicular to the support shaft 26 and is wound with an urging spring 31a. An operation lever 31 for rotating the rotary cover 13 back and forth through a pin 31b is mounted on the shaft.
Is designed to be rotatable back and forth along a guide hole 32a formed in an operation plate 32 fixedly provided above the side plate 4b.

On the other hand, the other side of the through projection of the support shaft 26,
That is, the rear cover 1 is provided on the side plate 4a side of the top mast 4.
A lock lever 33 for locking the lock member 6 at a desired position is pivotally mounted via a hanging portion 33b of a rotating plate 33a formed by bending a plate material fixed to a base end thereof into an inverted L-shape. The lock lever 33 is provided with a guide hole 34a formed in an operation box 34 fixed at the center of the side plate 4a of the top mast 4.
Operable to be able to rotate back and forth along the axis.
Therefore, since the lock lever 33 and the operation lever 31 for rotating the rotary cover 13 are pivotally mounted on both ends of the support shaft 26, the rotation fulcrum of the lock lever 33 and the rotation fulcrum of the operation lever 31 are coaxial. It is composed of

FIGS. 7 to 9 show a related structure of the lock lever 33 and the suspension rod 19. The hanging portion 33b of the rotation plate 33a of the lock lever 33 has the inner portion 35a of the wire cable 35. The distal end portion is connected, and the distal end portion of the outer 35b of the wire cable 35 is fixed to a rear side plate 34b of the operation box 34 via a fastener 38, and the rear end of the outer 35b is connected to the intermediate cover 15. Fixed suspension bracket 17
The inner 35 is fixed to one side of a hollow boss 40 fixed to a connection shaft 39 provided between the left and right side plates 17a and 17b via a fastener 41 and extended into the hollow portion of the boss 40.
A lock pin 37 is provided at the rear end of the a through an urging bullet 42 that is loaded in the hollow portion. The lock pin 37 pivots the lock lever 33 back and forth along a guide hole 34 a formed in the operation box 34, so that the plurality of engagement holes 1 formed in the axial direction of the suspension rod 19 are formed.
9a. Reference numeral 19b denotes a pressurizing machine interposed between the suspending bracket 17 and the bracket 18, and reference numeral 19c denotes a pressurizing machine interposed at the upper end of the suspension rod 19.

In the construction described above, when the tilling operation is performed using the rotary tilling machine 2, the rotary cultivator 2 is attached to the rear portion of the tractor 1, and the rear cover 16 is standardly cultivated, scraped, shallowly cultivated. Adjust the position to detect the plowing depth suitable for the working conditions, such as ridges. The adjustment of the rear cover 16 is performed by the operation lever 31 while the operator is on the tractor 1.
Is simply operated in the front-rear direction along the guide hole 32a formed in the operation plate 32.

On the other hand, the rear cover 16 is used not only for detecting the tillage depth, but also for leveling the cultivated soil mass and removing the rotary, for car washing and ridge filling work, and for ridge work. In some cases, the rear cover needs to be locked in a position suitable for each task.

In order to lock the rear cover 16 at a position suitable for the desired work, first, the operating lever 31 is rotated back and forth to adjust the rear cover 16, and as shown in FIG. When the lock lever 33 is rotated forward, as shown in FIG.
7 is projected from the boss 40 by the urging bullet 42, and the front end portion is engaged with the engagement hole 19 a formed in the suspension rod 19, so that the rear cover 16 can be locked. In order to release the lock on the rear cover 16 after the operation, as shown in FIG. 8, if the lock lever 33 is rotated backward, the lock pin 37 enters the boss 40, so that the operation lever 31 Does not hinder the front-rear rotation.

When the lock lever 33 locks and unlocks the rear cover 16 in a series, the lock lever 33 and the operation lever 31 are disposed at the left and right ends of the support shaft 26 on which the top mast 4 extends. Since the support shaft 26 serves as a common fulcrum of the lock lever 33 and the operation lever 31, the rear cover 16 can be locked smoothly and easily by a series of operations by the operation lever 31 and the lock lever 33, and the lock is secure. In particular, when the rear cover 16 is locked at the upper position, the safety of the operation can be ensured.

[0022]

As is apparent from the above description, according to the present invention, the rotation fulcrum of the operation lever for rotating the rotary cover back and forth and the rotation fulcrum of the lock lever for locking the rear cover at a desired position are provided. Because it is configured with the same shaft, the structure can be simplified, the number of parts can be reduced, the weight can be reduced, the cost can be reduced, and the suspension rod for suspending the rear cover can be locked by operating the lock lever. It is possible to reliably perform various operations using the rear cover in addition to detecting the tillage depth.

[Brief description of the drawings]

FIG. 1 is an overall side view of a rotary tiller during a deep tillage operation.

FIG. 2 is an overall side view of a rotary cultivator during a scraping operation.

FIG. 3 is an overall side view of the rotary cultivator at the time of mulling work.

FIG. 4 is a plan view of a rotary tiller.

FIG. 5 is an overall perspective view of a rotary tiller.

FIG. 6 is a rear view of a main part of the rotary tiller.

FIG. 7 is a side view of a main part with the rear cover locked.

FIG. 8 is a side view of a main part in a state where a lock of a rear cover is released.

FIG. 9 is a longitudinal sectional view of a suspension rod.

[Explanation of symbols]

 2 Rotary tiller 4 Top mast 12 Tilling shaft 13 Rotary cover 15 Intermediate cover 15 Rear cover 31 Operating lever 33 Lock lever

Claims (2)

[Claims] 1. A rotary tiller having a rear cover connected to a rear end portion of a rotary cover via an intermediate cover, the rear cover being rotatable with the rotary cover and the intermediate cover back and forth about a tilling axis. A support shaft is rotatably mounted on a top mast made of a pair of left and right plates fixed to the upper part of the cultivator, and a rear cover is turned on one side of the through protrusion of the support shaft to a position adapted to the working conditions. The operation lever to be adjusted by dynamic adjustment is axially mounted, and a lock lever for locking the rear cover in an appropriate position is axially mounted on the other side of the through-projection portion of the support shaft. Locking device. 2. A lock pin is provided at a rear end portion of a wire cable having a tip end portion connected to the lock lever via an urging mechanism, and the lock pin is turned by a front-rear rotation operation of the suspension rod of the rear cover. 2. The device according to claim 1, wherein said plurality of engagement holes formed in the axial direction are detachable.
A lock device for a rear cover in the rotary tiller according to any one of the preceding claims.