FI83584B - GRAESKLIPPARE. - Google Patents

Description

1 83534

Lawn mower - Gräsklippare

The invention relates to a collecting lawnmower according to the preamble of claim 1.

The operating principle of such collecting lawnmowers is to transport the cut grass along the duct leading from the cutting room to the collection tank by means of a strong air flow. The air flow is formed by a cutting blade with a large blade angle and in addition a separate fan placed on the motor shaft can be used. The air flow principle is a centrifugal fan, where the intake air is led to the center of the fan from separate air openings. Because the strong airflow directs the cut grass to the outer edges of the cutting area, the grass is not cut into fine shreds and causes an unsatisfactory end result if the collector is not used. A further disadvantage is that the continuous use of the collector generates a considerable amount of cutting waste, which is a problem for composting. In addition, the lawn becomes poorer because it does not receive fertilizer from the cut grass. Another disadvantage is that the strong airflow causes dust and noise, and in addition, a lawn mower that collects on a renovated and weak or freshly fertilized lawn cannot be used due to the strong airflow. The advantage of the collecting lawnmower, on the other hand, is that it cleans debris, tree leaves, small branches, etc. from the lawn.

The object of the invention is to improve such a known collecting lawnmower so that it can be changed if necessary. bioleikkuriksi. In this case, the advantageous properties of the collecting cutter can be utilized, if necessary, and correspondingly, if necessary, the machine can be used as a bio-cutter, whereby the disadvantages of the collecting cutter are eliminated. To achieve this object, the collecting lawnmower according to the invention is characterized in that the supply air opening is provided with a closing member for restricting the air flow.

In a preferred embodiment, the exhaust air opening is also provided with a closing member.

An electrically controlled or mechanically set air valve, for example, can be used as such a closing element. The electrically controlled valve can be, for example, a solenoid valve or a motor-operated valve.

Closing the air intakes causes the airflow to be reversed so that the intake air is taken from below the edges of the machine to the front, whereby the cut grass rises upwards and in the middle due to this airflow, descending on a rotating blade that shreds the grass as finely as possible.

Normally collecting lawnmowers are arranged so that the collection container is located at the rear of the machine. The tank is easily removable and the machine body usually has a separate door that closes the channel in the blade compartment when the tank is removed. If necessary, such a hatch can be used as such as a closing member of the outlet duct. However, closing the exhaust duct alone does not provide the desired effect because the air flowing from the air inlets causes the cut grass to move to the edge of the cutting chamber and below the edges of the machine outwards from the cutting chamber, resulting in heavy dusting.

The invention will now be described with reference to the accompanying drawings, in which:

Figure 1 shows a schematic sectional view of a lawnmower with a separate blowing device.

3 83584 Fig. 2 shows a cutter without a separate blowing device, respectively, and Fig. 3 shows the air flow of the device according to Fig. 1 with the closing member closed.

In Figures 1-3, the same parts are used for the same reference numerals. The lawnmower 1 to be collected according to Fig. 1 comprises a frame part 10, a motor 7 arranged therein with its drive shafts 8 and a cutting blade 2 mounted on the shaft 8 with a tip part 3. A cutting space 9 is further formed in the frame part 10. Above the blade member 2, 3, a drive shaft 11e 8 is further attached to the fan 4, which receives the required intake air through the opening 5. Thus the air flow consists of a substantially arrow A to move the line of cut grass cutting space 9 in the edge region and from there to the outlet (not shown) keruusäi1iöön (not shown). Naturally, a little secondary air enters the blade space from below the edges of the blade space.

Figure 2 is without the blow device collecting the mower, respectively, shown with the blade 2 of the tip portion 3 of the blade angle by appropriate selection provide the required air flow, wherein the main air flow formed by the direction of arrow b, by shifting the ground, respectively, as in Figure 1 towards the blade space 9 of the edge portions and further through the outlet keruusäi1iöön.

Figure 3 shows one cutter of the closure member of Figure 6 closed, whereby the main air flow formed by the direction of arrow C of transferring the cut grass cutting in the space 9 upward and medium-kellespäin, where it can drip blade body 2, which is self-propelled and it is further possible to fine.

The closing member 6 shown in Figures 1-3 may be, for example, an electrically controlled air valve, e.g. a solenoid valve or a motorized valve. Such a valve is easy to control centrally from the control panel. Alternatively, the closing member can also be a mechanical valve, the control of which is arranged, for example, on top of the machine or centrally from the control panel. Said control panel can be placed, for example, on the push arm of the mower, making its use as simple as possible.

The power source of the collecting lawnmower according to the invention is suitable for both a conventional internal combustion engine and a mains-electric motor, and in addition, the collecting lawnmower according to the invention can be implemented as battery-operated.

Claims (4)

1. Collecting lawnmowers having at least one air inlet opening (5) substantially in the rotation plane of the blade (2, 3) or above it and eating at least one air outlet opening leading to a collection container, and means (3, 4) to provide an air flow for conveying the mowed grass via the outlet orifice to the collection container, characterized in that the air inlet orifice (5) is provided with a closure means (6) to limit the flow of air. . Mower according to claim 1, characterized in that the outlet opening is additionally provided with a closing means. Mower according to claim 1 or 2, characterized in that the closing member (6) is an electrically controlled valve, e.g. solenoid valve or motor driven valve. Mower according to claim 1 or 2, characterized in that the closing member (6) is a mechanical valve.