JPH01296914A - Structure for adjusting mower height of lawn mower - Google Patents

Abstract

PURPOSE:To facilitate readjustment of a cutting height of a mower by providing a lower limit setter for regulating automatic lowering of the mower at an optional position by mechanical contact. CONSTITUTION:The height of a mower (M) is adjusted before starting operation to regulate lowering of the mower (M) by its own weight with mechanical contact by a lower limit setter 15. Even if the mower is lifted during operation, the mower is regulated and stopped at the previously adjusted position simply by lowering thereof with its own weight and cutting height can be also kept constant without requiring readjustment of the cutting height.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lawn mower that is configured to have a mower attached to the lower abdomen of a traveling machine body, which can be lowered by its own weight and raised by a hydraulic cylinder. The present invention relates to a mower height adjustment structure.

[Conventional technology]

In a typical lawn mower, the distance between the cutting blade and the ground can be changed by changing the setting position of a gauge wheel that is pivotally supported by a mower up or down, thereby adjusting the cutting height.

However, with this type of lawn mower, the entire load of the mower is applied to the gauge wheel, so depending on the conditions of the work site, the lawn may be damaged or the gauge wheel may leave streaks on the mowed area.

In such a case, the mower, which descends due to its own weight, is raised and stopped by a hydraulic cylinder, thereby mowing the lawn with the gauge wheel floating.

[Problem to be solved by the invention]

However, when working in such a suspended state, even if the cutting height is adjusted at the beginning of the work, if a situation arises in which the mower must be raised due to an embankment during work, the cutting height may be adjusted. I had to make adjustments again, which took a lot of time.

The present invention was devised in view of these circumstances, and its purpose is to facilitate readjustment of the mowing height of the mower.

[Means to solve the problem]

A characteristic feature of the present invention is that a lower limit setting device is provided for regulating the lowering of the mower's own weight at an arbitrary position by mechanical contact, and its functions and effects are as follows.

[For production]

If you adjust the height of the mower before starting work and restrict the descent of the mower's own weight at that position by mechanical contact with the lower limit setting device, it is possible to control the mower by driving the hydraulic cylinder during work. Even if the mower is raised, if it is lowered by its own weight, the mower will be regulated and stopped at the previously adjusted position.

〔Effect of the invention〕

According to the present invention, even if a situation arises in which the mower must be raised due to an embankment during work, there is no need to adjust the cutting height again, and the cutting height can be kept constant. become.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

What is shown in FIG. 7 is a riding type lawn mower to which the present invention is applied. This lawnmower has a pair of front wheels on each side (
A mower (M) is attached to the lower abdomen of a traveling body (A) having rear wheels (1) and rear wheels (2) via a parallel link mechanism (3) so as to be able to rise and fall freely.

The parallel link mechanism (3) consists of a pair of front links (4) and a rear link (5) on the left and right, and a lifting rod (6) is pivotally supported on the rear link (5). It has been done. As shown in FIG. 1, one end of a rotating member (8) shaped like a dogleg when viewed from the side is connected with a pin to the upper part of the rod (6), as shown in FIG. A piston rod (9) of a hydraulic cylinder (Cy) is pivotally supported at the other end of the rotating member (8). and a hydraulic cylinder (Cy
) is extended and driven, the rotating member (8) rotates clockwise in the figure, pulls up the rod (6), lifts the rear link (5), and raises the mower. The bottle hole (10) formed at the top of the rod (6) is a long hole, and a gauge ring (10) is formed in the embankment.
1) is designed to absorb the upward movement of the rod (6) when the mower (M) is lifted up.

The hydraulic cylinder (Cy) is a single-acting type that can be extended and held in position by operating a lever (12) at hand, and is pivotally supported on the main frame (13) of the traveling aircraft (A). . This hydraulic cylinder (Cy) is driven to extend to raise the mower (M), and by adjusting the cutting height and fixing it at an appropriate position, the mower (M) and gauge wheel (11) are lifted off the ground. It is possible to work in this state.

Note that this hydraulic cylinder (Cy) contracts by utilizing the lowering of the mower (M) due to its own weight.

The main frame (13) includes a hydraulic cylinder (Cy
) is fixedly provided with a stopper (14) that prevents the piston rod (9) from being pulled out. By attaching the stopper (14) externally, the structure of the hydraulic cylinder (Cy) is configured as a simple ram cylinder, thereby simplifying the assembly process. The limit point at which the piston rod (9) contacts this stopper (14) is the highest raised position of the mower (M), that is, the retracted position.

The lawn mower is provided with a lower limit setting device (15) that regulates the lowering of the mower (M) by mechanical contact in six stages. Next, this lower limit setting device (15) will be explained.

As shown in Figures 1 to 3, the main frame (13
) An operating shaft (17) is loosely inserted into a boss (16>), and a lever (24) is attached to the outer end of this operating shaft (17), and a positioning plate (18) is attached to the portion adjacent to both ends of the boss. ) and a nail plate (19) are fixed to each other.

By swinging the lever (24), the positioning plate (18) and the claw plate (19) are caused to swing integrally.

The positioning plate (18) has six circular holes (20a), (20b), (20c), (
20d), (20e).

(2Of) are bored along the circumferential direction. On the other hand, the main frame (13) is provided with a ball detent mechanism (21). The positioning plate (18) is swung by the swiveling operation of the lever (12), and when any of the circular holes (20a) to (2Of) comes to the side of the ball detent mechanism (21), the ball (22) ) is the circular hole (20a) ~ (2Of
) so that the positioning plate (18) and the claw plate (19) are held in a predetermined position.

The claw plate (19) is provided with a sawtooth claw portion (19a) for contacting the tip of the lock arm (23).

The lock arm (23) is fixed to the rotating member (8) so as to swing together, and its tip is attached to the claw plate (19).
By contacting the claw portion (19a) of the mower (M), upward swinging is restricted, and at the same time, the descent of the mower's own weight is restricted.

More specifically, as shown in FIG. 5, when the lever (24) is operated to cause the ball (22) to enter the first circular hole (20a), the tip of the lock arm (23) touches the claw plate (19). The gauge wheel (11) is in a state where it can freely swing up and down without contacting the claw portion (19a), and the lowering of its own weight is not restricted, and work can be performed with the gauge wheel (11) in contact with the ground. Next, lever (24
) to plunge the ball (22) into either of the second circular hole (20b) and the fifth circular hole (20e), so that the tip of the lock arm (23) aligns with the claw part (19a) of the claw plate (19). ), the lower limit setting device (15) operates and the upward swing of the lock arm (M) is regulated in 4 stages, and the mower (+, D is in 4 high and low positions) The descent is regulated.

If the height of the mower (M) is set at one of these positions, even if the mower (M) is raised during work with the gauge wheel (11) lifted off the ground, it will be easily lowered by its own weight. Can be returned to original cutting height. Furthermore, as shown in FIG. 6, the ball (22) is pushed into the sixth circular hole (2Of) by operating the lever (12), and the tip of the lock arm (23) is inserted into the claw part (19) of the claw plate (19). When engaged with 19a),
The rocking of the lock arm (23) in both the vertical directions is restricted, and the mower (23) is fixed in the retracted position.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the mower height adjustment structure for a lawn mower according to the present invention, in which Fig. 1 is a side view of the main part, Fig. 2 is a front view of the main part, and Fig. 3 is a longitudinal sectional front view of the main part. , Fig. 4 is a side view of the positioning plate, Fig. 5 is a side view of the lower limit setting mechanism when the mower is in the retracted state, Fig. 6 is a side view of the lower limit setting mechanism when the mower is in a state where its own weight can be lowered, and Fig. 7 is a side view of the lower limit setting mechanism when mower is mowing. FIG. 2 is an overall side view of the machine. (15)... Lower limit setting device, (A)...
・Traveling body, (Cy)...Hydraulic cylinder, (M
)...More.

Claims (1)

[Claims] A mower (M) is attached to the lower abdomen of the traveling aircraft (A), and this mower (M) is lowered by its own weight, and is connected to a hydraulic cylinder (C).
A mower height adjustment structure for a lawn mower configured to be able to be raised by a lower limit setting device (1
5) Lawn mower mower height adjustment structure.