JPH03108407A - Lawn mower - Google Patents

Abstract

PURPOSE:To prevent the clogging of a duct with mowed lawn grass by forming a duct in circular cylindrical form and supplying wind from a blower fan attached to a driving shaft of a blower in a direction nearly tangential to the initial end part of the duct. CONSTITUTION:A blower 12 and a blower fan 13 are rotated with a horizontal driving shaft 11. The blower is separated from the blower fan with a partition wall 14a integrally molded with a case 14. The carrying air flow from the blower is supplied along the mowed grass transfer path of a circular cylindrical duct 9 and the carrying air flow from the blower fan is supplied in the direction tangential to the case to generate strong gyrating flow in the duct in high efficiency.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a mower with a rotary cutting blade installed in the cut grass discharge section of the mower.
This invention relates to a lawn mower equipped with a blower that winds and conveys discharged grass clippings to a grass collecting container via a duct.

[Conventional technology]

Examples of the above lawn mower include U, S, P, and 47.
As shown in Japanese Patent No. 35037, there is one in which the duct is configured in the shape of a rectangular tube.

[Problem to be solved by the invention]

However, according to the above configuration, if the grass is dry and light, no problem will occur, but when mowing grass that is wet or contains a lot of moisture, the cut grass is heavy and highly adhesive. A portion of the grass clippings adheres to the inner wall of the duct, particularly at the corners, and other grass clippings adhere one after another around that location, resulting in clogging of the grass clippings in the duct. Efforts have been made to make the ducts cylindrical and to increase the amount of air conveyed by blowers, but these efforts have had little effect on preventing grass clippings from clogging the ducts.

An object of the present invention is to improve the structure of a cut grass conveying device and to reliably prevent the cut grass from clogging the duct.

[Means to solve the problem]

The characteristic configuration of the present invention for achieving the above object is that the duct is configured in a cylindrical shape, a blower fan is attached to the drive shaft of the blower, and the air from the blower fan is directed to a starting end side portion of the duct. The point is that it is configured to be supplied from a substantially tangential direction.

[For production]

According to the above configuration, since the wind generated by the blower fan is supplied from the substantially tangential direction of the starting end of the duct to the cut grass conveying wind by the blower, a strong vortex is generated and the grass adheres to the inner wall of the duct. This creates a strong action that peels off the grass clippings.

〔Effect of the invention〕

Therefore, the grass clippings adhering to the inner wall of the duct are peeled off before the next clippings overlap and adhere, and the duct is no longer clogged with clipped grass.

Furthermore, since the blower fan is used together with the blower, a larger air volume can be obtained compared to the conventional example in which only the blower is used, and the grass clippings conveyance capacity can be further improved.

〔Example〕

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

FIG. 4 shows a riding lawn mower according to the present invention.

This riding lawnmower has front and rear driven wheels (1) and (2) that are configured to be steerable, and has an engine (3) at the front and a transmission case (4) at the rear.
In addition, a steering handle (5) and a driver's seat (6) are provided in the center of the aircraft, and a mower (7) is provided in the middle of the front and rear wheels (1) and (2). ) A grass collection container (10) is installed at the rear of the machine to accommodate the grass clippings transported via a duct (9) from a clippings transport device (8) provided at the clipped grass discharge section located at the right end of the machine. There is.

As shown in FIG. 3, the mower (7) is composed of three blade-shaped rotary cutting blades (21) housed in a cutting blade housing (22), and the driving force of the engine (3) is transmitted to a transmission shaft (23).
) is transmitted to the left and right cutting blade drive shafts (25) and (28) by the transmission belt (24), thereby driving the three rotary cutting blades (21). Then, the transmission shaft (23
) to the drive shaft (11) of the cut grass conveyor (8) is transmitted via a bevel gear mechanism (26) and a rotating shaft (27).

As shown in FIGS. 1 and 3, the cut grass conveying device (8
) includes a blower (12) and a blower fan (13) which are driven and rotated by the horizontal drive shaft (11);
A case (14) that accommodates two fans (12) and (13)
). Then, the blower (12) and the ventilation fan (
13) is a partition wall (14) integrally molded with the case (14).
The case (14) is partitioned by a) and is provided with an intake port (15) for supplying outside air to the blower fan (13). The cut grass conveying wind generated by the blower (12) is sent out along the cut grass conveying path, and the conveying wind generated by the blower fan (13) is divided into two conveying winds by the partition wall (30). Case (14) and partition wall (
14a) and the second air outlet (31) on the lower side of conveying the cut grass, respectively, are sent out in the tangential direction of the case, and a strong vortex is efficiently generated in the duct (9). It is configured like this.

The cut grass is transferred to the grass collecting container (10) by the cut grass conveying device (8).
When the grass collection containers (10) are sent one after another, the grass container (10) becomes heavier, the center of gravity of the aircraft moves backwards, the ground load applied to the rear wheels (2) increases, and the grass is damaged by the rear wheels (2). There is. To solve this problem, an automatic longitudinal balance adjustment device (29) is provided at the front of the aircraft. This device (29) consists of a control mechanism (18), a motor (19), and a balance weight (20), and controls the load of the grass collection container (10) installed on the support frame (17) of the grass collection container (10). A signal from a weight sensor (not shown) is sent to the control mechanism (18), and the control mechanism (18) drives the balance weight (20) which can rotate forward and backward. ) or a pair of guide members (
32) and is screw-fed. When the control mechanism (18) senses that the balance weight (20) has reached a predetermined position, the motor (19) is automatically stopped.

4. Note that 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 drawings]

The drawings show an embodiment of the lawn mower according to the present invention, Fig. 1 is a diagram showing the structure of the mower's cut grass discharge section, and Fig. 2 is a partially cutaway cross section showing the flow of air from the blower fan to the duct. Perspective view,
FIG. 3 is a partially cutaway sectional plan view of the mower, FIG. 4 is an overall side view of the riding lawn mower, and FIG. 5 is a partially cutaway sectional view showing the structure of the longitudinal balance adjustment device. (7)...Mower, (9)...Duct, (10)...Grass collection container, (11)...
・・Drive shaft, (12)・・Blower, (13)・
...Blower fan, (21) ... Rotating cutting blade.

Claims (1)

[Claims] The discharged grass is sent to the grass collection container (10) through a duct (9) to the cut grass discharge part of the mower (7) which has a rotary cutting blade (21) inside.
) is provided with a blower (12) for wind conveyance, the duct (9) is configured in a cylindrical shape, and a blower fan (13) is mounted on the drive shaft (11) of the blower (12). ), and is configured to supply air from the blower fan (13) to the starting end side of the duct (9) in a substantially tangential direction.