JP2648171B2 - Mower height adjustment structure for lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is configured such that a mower is suspended and mounted on the lower abdomen of a traveling machine body so as to be able to ascend and descend, and the mower is lowered by its own weight and is forcibly raised. The present invention relates to a mower height adjusting structure for a lawn mower.

[Conventional technology]

In a general lawn mower, the distance between the ground and the cutting blade is changed by changing the set position of the gauge wheel supported by the mower up and down, and the cutting height is adjusted. However, in this type of lawn mower, the entire load of the mower is applied to the gauge wheel, and depending on the conditions of the work site, the lawn may be damaged, or traces of the gauge wheel may remain in a streak on the mowing site.

In such a case, mowers that are lowered by their own weight are forcibly lifted to a desired height and stopped to perform lawn mowing work with the gauge wheels floating.

[Problems to be solved by the invention]

However, in the work in such a suspended state, even if the cutting height is adjusted at the start of the work, there is an obstacle such as an embankment during the work, and a situation arises in which the mower must be raised and passed. Therefore, after passing the obstacle, the cutting height must be adjusted to a desired height again, which is troublesome.

The present invention has been made in view of such a situation, and an object of the present invention is to make it possible to easily adjust the cutting height after a temporary mower elevating operation, thereby improving work efficiency. It is in.

[Means for solving the problem]

The feature configuration of the present invention is a mower height adjusting structure of a lawn mower configured to suspend and mount a mower on the lower abdomen of the traveling body so as to be able to move up and down and to lower the mower by its own weight, and to perform a forced ascending operation. There is provided a lower limit setting device for restricting the lower limit of the mower's own weight by mechanical contact. The lower limit setting device allows the mower to freely move upward and restricts the downward movement of the mower. And the lower limit of the mower's own weight can be set and changed in a plurality of stages by alternately contacting any one of the engaging portions. The effects are as follows.

(Operation)

Since the lower limit setting device is provided to set the lower limit of the mower's own weight by contacting the engaging portion in a state where the mower can be raised, the mower is raised while setting the lower limit of the own weight. The mower can be raised to move over an obstacle or the like by simply performing the operation.

In addition, since a plurality of engaging portions are provided and the lowering limit of the mower's own weight can be set to a plurality of stages by using one of these engaging portions, the mower can be temporarily stopped during work to overcome obstacles or the like. Even if it is raised, the mower will stop at its own weight lowering limit set by the previously selected engagement portion if it is subsequently lowered by its own weight.

In addition, since the setting of the own weight lowering limit is performed by selecting the engagement portion, the setting change of the own weight lowering limit can be performed very easily and quickly.

〔The invention's effect〕

According to the present invention, even if the mower needs to be temporarily raised during work, the mowing height can be returned to the original cutting height only by performing a lowering operation next time. The lawn mowing operation can be performed efficiently without the need for frequent adjustment operations, and the setting of the lower limit of its own weight can be changed with good workability.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 7 shows a riding lawn mower to which the present invention is applied. In this lawn mower, a mower (M) can be moved up and down on a lower abdomen of a traveling body (A) having a pair of left and right front wheels (1) and rear wheels (2) via a parallel quadruple link mechanism (3). It is configured to be attached to the.

The parallel quadruple link mechanism (3) includes a front link (4) and a rear link (5), each of which is a pair of left and right, and a lifting rod (6) is pivotally supported on the rear link (5). I have. As shown in FIG. 1, one end of a side-viewing turning member (8) loosely fitted to the support shaft (7) is pin-connected to the upper part of the rod (6), A piston rod (9) of a hydraulic cylinder (Cy) is pivotally supported at the other end of the rotating member (8).

When the hydraulic cylinder (Cy) is driven to extend, the rotating member (8) rotates clockwise in the drawing to pull up the rod (6), lift the rear link (5), and move the mower (M). It is designed to rise. The pin hole (10) formed at the upper part of the rod (6) is a long hole, and when the mower (M) is lifted by the gauge wheel (11) riding on the embankment or the like, the rod (6) is removed. It absorbs the upward movement.

The hydraulic cylinder (Cy) is a single-acting type which can be extended and driven by operating a lever (12) at hand, and is pivotally supported on a main frame (13) of the traveling body (A). . The mower (M) and the gauge wheel (11) were lifted off the ground by extending and driving the hydraulic cylinder (Cy) to raise the mower (M), adjusting the cutting height and fixing the mower (M) at an appropriate position. Work can be performed in the state. still,
The hydraulic cylinder (Cy) contracts by utilizing the lowering of the mower (M) due to its own weight.

The main frame (13) has a hydraulic cylinder (Cy)
A stopper (14) for preventing the piston rod (9) from being pulled out is fixed. By externally attaching the stopper (14), the structure of the hydraulic cylinder (Cy) is configured as a simple ram cylinder, thereby simplifying the assembling process. The limit point at which the piston rod (9) comes into contact with the stopper (14) is the highest rise position of the mower (M), that is, the storage position.

The lawn mower is provided with a lower limit setting device (15) for setting the lower limit of the weight of the mower (M) in six stages by mechanical contact. Next, the lower limit setting device (15) will be described.

As shown in FIGS. 1 to 3, the main frame (1
The operating shaft (17) is loosely inserted into the boss (16) fixed to 3), a lever (24) is provided at the outer end of the operating shaft (17), and the positioning plate ( 18) and nail plate (1
9) and are respectively fixed.

The positioning plate (18) and the claw plate (19) swing integrally by swinging the lever (24).

The positioning plate (18) has six circular holes (20a), (20b), (20c), (20d), (20) as shown in FIG.
e) and (20f) are perforated along the circumferential direction. On the other hand, the main frame (13) is provided with a ball detent mechanism (21). When the positioning plate (18) is swung by the swinging operation of the lever (12) and one of the circular holes (20a) to (20f) comes to the side of the ball detent mechanism (21), the ball (22) ) Protrude into the circular holes (20a) to (20f), and the positioning plate (18) and the claw plate (19) are held at predetermined positions.

The claw plate (19) has a claw portion (19a) formed in a sawtooth shape for contacting the tip of the lock arm (23). That is, the claw plate (19) forms a plurality of engagement portions with the saw-toothed claw portions (19a). The lock arm (23) is fixed to the rotating member (8) and swings integrally. The tip of the lock arm (23) is brought into contact with the engaging portion of the claw (19a) of the claw plate (19). The upward swing is restricted, and at the same time, the lowering of the weight of the mower (M) is restricted.

More specifically, as shown in FIG. 5, when the ball (22) is pushed into the first circular hole (20a) by operating the lever (24), the tip of the lock arm (23) is moved to the claw plate (19). Claw (19
Since it is in a vertically swingable state that does not come into contact with a), the weight is not restricted from being lowered, and the work can be performed with the gauge wheel (11) grounded. Next, the lever (24) is operated to push the ball (22) from the second circular hole (20b) into one of the fifth circular holes (20e), and the tip of the lock arm (23) is moved to the claw plate (19). ) Can be brought into contact with the engaging portion of the claw portion (19a), the upward swing of the lock arm (23) is regulated by the lower limit setting device (15) in four steps, and the mower (M The weight lowering limit of ()) is set to four levels. If the height of the mower (M) is set at any position, even if the mower (M) is raised while the gauge wheel (11) is being lifted from the ground, it is easily lowered by its own weight. To the original cutting height. Further, as shown in FIG.
Operate the lever (12) to insert the ball (22) into the sixth circular hole (20).
f), and lock the end of the lock arm (23) with the claw plate (1
When the lock arm (23) is engaged with the engagement portion of the claw portion (19a) of (9), swinging of the lock arm (23) in both the up and down directions is restricted, and the mower (M) is fixed in the retracted posture.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of the mower height adjusting structure of the lawn mower according to the present invention. FIG. 1 is a side view of the main part, FIG. 2 is a front view of the main part, and FIG. Fig. 4 is a side view of the positioning plate, Fig. 5 is a side view of the lower limit setting mechanism in the mower stored state, Fig. 6 is a side view of the lower limit setting device in a state in which the mower is capable of lowering its own weight, and Fig. 7 is lawn mowing. FIG. 2 is an overall side view of the machine. (15)… Lower limit setting device, (A)… traveling body, (M)
...... Moore.

Continuation of the front page (72) Kure Politics 64, Ishizukita-cho, Sakai-shi, Osaka Kubota Iron Works Inside the Sakai Works Co., Ltd. (56) References Japanese Utility Model 1977-158111 (JP, U)

Claims (1)

(57) [Claims] A mower (M) is mounted on a lower abdomen of the traveling machine body (A) so as to be able to move up and down, and the mower is lowered by its own weight and the mower height of the mower is configured to be forcibly raised. Moor (M)
The lower limit setting device (15) for restricting the lower limit of the weight of the mower (M) by mechanical contact is provided. The lower limit setting device (15) allows free movement of the mower (M) to the rising side and lowers It has a plurality of engaging parts that regulate the movement to
A mower height adjusting structure for a lawnmower, wherein the lower limit of the weight of the mower (M) can be freely changed and set in a plurality of stages by selectively contacting any one of the engaging portions.