JPH0723641A - Riding type lawn-mowing machine - Google Patents

Abstract

PURPOSE:To provide a riding type lawn-mowing machine reduced in the operation force by using a gas spring as a spring for reducing the load of a mower, where the gas spring is provided so that the energizing force of the gas spring is balanced, when the mower is placed in the approximately center of its lifting range, of the lawn-mowing machine. CONSTITUTION:This riding type lawn-mowing machine has a mower in the traveling frame A through a link mechanism in a state capable of being lifted with a manual lever 9, the mower being hung through a spring for reducing the load of the mower, a gas spring 12 as the spring for reducing the load, and the gas spring 12 being disposed so that the energizing force of the gas spring is balanced, when the mower is placed in the approximately center of its lifting range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawn mower, and more specifically, a mower mounted on a traveling machine body via a link mechanism is configured to be movable up and down by a manual lever, and a spring for reducing the load on the mower is provided. A lawn mower that is suspended through

[0002]

2. Description of the Related Art Generally, in a riding lawn mower, as shown in Japanese Utility Model Laid-Open No. 4-124005, a mower is suspended via a spring for reducing a load in order to reduce the ground pressure of a gauge wheel of the mower. It has been lowered.

[0003]

With the manual lever,
In a riding lawn mower that raises and lowers the mower, the spring for reducing the load contracts as the mower is raised, so that the biasing force of the load reducing spring weakens and the operating force of the manual lever becomes heavy.

An object of the present invention is to reduce the operating force of a manual lever in a riding lawn mower which raises and lowers a mower by a manual lever.

[0005]

In order to achieve the above object, the present invention is characterized in that a spring for reducing a load on a mower is constituted by a gas spring, and the urging force of the gas spring is within a range in which the mower moves up and down. The point is that the urging force is set to be balanced when it is located at about the middle.

[0006]

The gas spring has a stronger bias as the lever is lowered at a position near the middle portion of the lifting / lowering range of the mower, and also becomes stronger as the lever is lifted, so that the mower is raised from the lowest position. In this case, the biasing force of the gas spring gradually weakens as it approaches the middle of the vertical range of the mower, and then the biasing force gradually increases in balance, that is, after the biasing force becomes zero. Becomes

Therefore, when the mower is operated from the lowest position to the highest position, the operation resistance L applied to the lever is, as shown in (a) and (b) of FIG. 3, (a) of FIG. Compared with the conventional characteristics shown in FIG. 3, it becomes smaller as shown in FIG. 3B, and the change in the assisting force of the spring can be made small and the operation can be performed lightly.

[0008]

As a result of the above construction, the raising operation of the mower by the manual lever becomes lighter than the conventional one, and the raising operation of the mower becomes easy.

[0009]

Embodiments of the present invention will be described below with reference to a mid-mount type riding lawn mower.

As shown in FIG. 4, in front of the traveling body A having an engine 1, a transmission case 2, a steering handle 3, a driver's seat 4, front steering wheels 5a, and rear driving wheels 5b.
A mower 7 is mounted between the rear wheels 5a and 5b via a link mechanism 6 including a pair of left and right front links 6a and a pair of left and right rear links 6b to form a mid-mount riding lawn mower.

As shown in FIGS. 2 and 4, a manual lifting lever 9 mounted rotatably around a horizontal axis X on a support frame 8 extending from the vehicle body frame a and a cutting blade of the mower 7. The upper surface of the housing 7a is connected via a connecting rod 10 whose length is adjustable, and the mower 7 can be moved up and down by rotating the elevating lever 9 around the horizontal axis X.

As shown in FIG. 1, the lifting lever 9 is
When the nodge 9a at the upper end of the lever 9 is pushed, it can be freely engaged with and disengaged from a plurality of pin holes 11a formed in the guide plate 11, and the mower 7 can be locked at an arbitrary ascending / descending position.

A gas spring 12 for reducing the suspension load of the mower 7 is installed across the elevating lever 9 and the vehicle body frame a to reduce the ground pressure of the gauge wheel 7b of the mower 7.

The gas spring 12 is provided so that the biasing force thereof is balanced, that is, zero when the mower 7 is positioned substantially in the middle of the ascending / descending range.

A long hole 10a is formed in the upper part of the connecting rod 10 so that the mower 7 can follow the unevenness of the ground.

According to the above construction, when lowering the mower 7 at the highest position, the biasing force gradually decreases as the lever 9 is pushed down against the biasing force of the gas spring 12. When the biasing force of the mower becomes zero in the middle position of the lifting range of the mower, and when the lever 9 is further pushed down, the biasing force of the gas spring 12 gradually increases, and then the mower 7 moves. If the lever 9 is locked while the gauge wheel 7b is lightly in contact with the ground, the mower 7 is suspended via the gas spring 12 when the contact pressure of the gauge wheel 7b is small.

With this configuration, when the mower is raised, the biasing force of the gas spring gradually weakens as the mower approaches the middle of the ascending / descending range, and the operating resistance applied to the lever increases. After that, the biasing force of the gas spring gradually increases, so that the operation resistance applied to the lever becomes small, and the mower can be lightly lifted.

[Other Embodiment] The riding lawn mower may be a front mount type lawn mower.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

1] Partially cutaway side view of the lifting lever

FIG. 2 is a rear view showing the connection between the lifting lever and the mower.

[Figure 3] Chart

[Fig. 4] Overall side view

[Explanation of symbols]

 6 Link mechanism 7 Mower 9 Manual lever 12 Gas spring A Traveling machine

Claims (1)

[Claims] 1. A mower (7) mounted on a traveling machine body (A) via a link mechanism (6) can be raised and lowered by a manual lever (9), and the mower (7) is provided with a spring for reducing a load. In the riding lawn mower that is suspended via the spring, the spring for reducing the load is composed of a gas spring (12), and the urging force of the gas spring (12) is applied to the mower (7) at approximately the middle of the ascending / descending range. Riding lawn mower set to balance the urging force when it is located at.