JPH0419804B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a cutting blade which is installed in a housing so as to be freely rotatable around a vertical axis, and a grass collecting container is used to cut grass by blowing air from the cutting blade. The present invention relates to a lawn mower which is provided in a supplied state and is provided with a device for detecting and displaying the fullness of the grass collecting container.

[Conventional technology]

In the above lawn mower, as disclosed in Japanese Utility Model Application No. 61-128925, for example, pressure due to the accumulation of grass clippings is applied to the bottom of the housing near the end of the grass discharge passage for the grass collection container. There was a configuration in which a pressure sensor was installed to detect the pressure, and a device was installed on the operating handle to issue an alarm when the sensor was activated.

[Problem to be solved by the invention]

However, in the conventional structure described above, the structure detects the accumulation of grass clippings in the grass discharge path, so when this sensor detects that the grass is full, the grass collection container is already full of grass clippings, and the mowing container is already full. Since the grass had accumulated inside the housing, there were problems such as the grass clippings overflowing from the housing when the collected grass was being discharged, and there was room for improvement. Therefore, as a method for solving the above-mentioned problems, a structure as shown in FIG. 5, for example, was devised. That is, a display device 14 which also serves as a detection device is pivotally attached to a member 13 forming a supply section 8 that connects the inside of the cut grass interior of the housing and the grass collection container 7 so as to be able to swing up and down around the axis X. When the container 7 is not full, the wind that enters the container 7 together with the grass easily escapes from the ventilation hole of the container 7, and the supply air flows through the supply path 8, causing the display part 14a of the detection indicator 14 to When the grass container 7 protrudes outward and is raised to the non-full position C, and the grass collection container 7 becomes full, the ventilation hole of the container 7 becomes clogged with the collected grass, making it difficult for air to escape, and the air flow in the supply path 8 is reduced. When it disappears, the display section 14a is configured to descend to a full position B inside the supply path 8.

In other words, the full state of the cut grass is detected based on the wind force of the supply path 8, and although the problems of the prior art described above do not occur, there are the following disadvantages.

In other words, the wind force in the supply path 8 changes only within the range of positive pressure when the grass collection container is empty and zero pressure when it is full, and the range of change in the detection target value is relatively small. Because of this, the detection accuracy was low.

SUMMARY OF THE INVENTION An object of the present invention is to enable accurate detection of the full state of cut grass even if it is relatively easy to manufacture.

[Means to solve the problem]

A characteristic configuration of the present invention is that, in the lawn mower described at the beginning, the full detection display device is configured to detect a change in wind pressure in the housing and display full when the wind pressure is above a certain level, moreover,
Near the grass outlet for the grass collection container,
Further, the wind pressure sensing portion of the fullness detection display device is provided on the vertical wall portion of the housing at a location where the outer peripheral side of the cutting blade moves in a direction toward the grass discharge port.

[Effect]

In the vicinity of the grass outlet for the grass collection container, and in a location where the outer circumferential side of the cut grass moves in a direction approaching the grass outlet, when the container is not full, the air blown by the cutting blade will be removed from the grass outlet. When the container is full, air from the cutting blades becomes difficult to flow out from inside the housing and becomes positive pressure, so the range of change in the detection target pressure is different from the conventional zero pressure and positive pressure. It becomes wider than something that is just between. Therefore, even if the detection accuracy is relatively low, it is possible to accurately detect and display the empty state and the full state.

In addition, the wind pressure sensing section is installed on the vertical wall of the housing, which is not easily affected by the wind path being blocked by the accumulation of cut grass or by the weight of the grass. There is little risk of causing this.

〔Effect of the invention〕

As a result, by effectively utilizing the wind pressure associated with the rotation of the cutting blade, it is easy to accurately determine whether the mowing blade is full or not. It has become possible to prevent work from being interrupted many times by doing it before the tank is full, and to efficiently perform work to achieve a good finish.

〔Example〕

As shown in FIGS. 3 and 4, the machine has a pair of left and right front wheels 1, 1 and rear wheels 2, 2, and has a mowing blade 3 internally rotatable around a vertical axis P. An engine 5 for driving the cutting blade 3 is attached to the upper surface side of the cutting blade housing 4 which also serves as a frame, and
A control handle 6 is attached to the rear part of the housing 4, and a grass bag 7 is attached to the cutting blade 3.
The walk-behind lawn mower is configured such that air is supplied through the supply path 8 of the cutting blade housing 4 by the rotation of the blade, and is detachably attached.

As shown in FIG. 1, the lower end side of the transparent cylindrical body 9, which is positioned on the lateral outside of the housing 4 in the vertical direction of the aircraft body and connected to the lateral vertical wall portion 4a of the housing 4, is connected to the lower end side of the housing 4. The outer circumferential side of the rotating cutting blade 3 is the grass discharge port in the interior of the portion where the cutting blade 3 is installed and located near the grass discharge port 10 for the supply path 8 in the interior portion of the blade. The wind pressure sensing section is configured by communicating with the point A that moves in the direction approaching 10, and the spherical body 11 is connected to the cylindrical body 9.
A fullness detection display device 12 is installed so as to be able to be raised and lowered, and the fullness detection display device 12 detects and displays whether the grass collecting bag 7 is full based on the internal pressure of the housing caused by air blowing by the cutting blade 3.
has been configured.

That is, if the bag 7 is not full, the wind that enters the bag 7 together with the grass easily escapes from the weave that serves as the air vent hole, so that the air blown by the cutting blade 3 smoothly flows out from the grass outlet 10 and is removed from the area A. When the pressure becomes negative, the sphere 11 falls to a non-full display position C supported by the lower end of the cylindrical body 9, as shown in FIG. When the bag 7 is full, the weave is clogged with recovered grass, making it difficult for the wind that enters with the grass to escape from the bag 7, making it difficult for the air blown by the cutting blade 3 to flow out from inside the cutting blade interior of the housing 4. When the pressure at the point A becomes positive, the ball 11 is raised to the full display position B at the upper end of the cylindrical body 9 due to the wind pressure acting inside the cylindrical body 9, as shown in FIG. It is designed so that it will be done.

[Another example]

Detection and display devices with various detection configurations and display configurations, such as an electric sensor that detects the pressure at the point A and a display device that operates a display device or indicator lamp based on information from this sensor, are adopted. The present invention is also applicable to these cases.

You may also use a basket instead of Grass Collection Bag 7.
These are collectively referred to as a grass collecting container 7.

[Brief explanation of drawings]

The drawings show an embodiment of a lawn mower according to the invention,
Figure 1 is a cross-sectional view of the detection device in a full detection state, Figure 2 is a cross-sectional view of the detection device in a non-full detection state, Figure 3 is a side view of the entire walk-behind lawn mower, and Figure 4 is a walk-behind lawn mower. FIG. FIG. 5 is a sectional view of a conventional detection and display device. 3...Mowing blade, 4...Housing, 4a...Vertical wall portion, 7...Grass collecting container, 10...Discharge port, 12...
Full detection display device, A... location, P... shaft center.

Claims (1)

[Claims] 1 The cutting blade 3 is installed inside the housing 4 so as to be freely driven and rotatable around the vertical axis P, and the grass collecting container 7 is provided in a state where the cut grass is supplied by the air blown by the cutting blade 3, and the grass collecting container 7 7, the lawnmower is equipped with a device 12 for detecting and displaying a full state, and the full state detecting and display device 12 detects a change in wind pressure within the housing 4 and displays a full state when the wind pressure is above a certain level. Further, the housing 4 is arranged vertically at a point A which is near the grass outlet 10 with respect to the grass collection container 7 and where the outer peripheral side of the cutting blade 3 moves in a direction approaching the grass outlet 10. A lawnmower in which a wind pressure sensing part of the fullness detection display device 12 is provided on the wall part 4a.