JPH0920155A - Safety equipment for mobile agricultural machinery - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] Safety in a mobile agricultural machine that prevents the engine from starting when the engine is stopped and the main clutch lever is "ON" and the traveling gear shift lever is in a position other than the neutral position. An object is to obtain a device. A safety device to be installed in a mobile agricultural machine equipped with an engine and equipped with a main clutch lever and a travel speed change lever, the switch being turned on in conjunction with the "on" of the main clutch lever and the travel speed change lever. A switch that is turned on when is not in the neutral position and a switch that is turned on when the engine is stopped are connected in series.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a mobile agricultural machine equipped with an engine started by a recoil starter or the like.

[0002]

2. Description of the Related Art A mobile agricultural machine equipped with a recoil starter engine at the front of the machine body is operated by turning on the engine switch and operating the recoil starter knob.
The engine can be started. Further, a main clutch lever is attached to the steering wheel, and a traveling speed change lever is mounted near the steering wheel.

[0003]

In a mobile agricultural machine equipped with such a recoil starter engine, the engine can be operated by operating the recoil starter even when the main clutch lever is in the "on" state. Since it can be started, especially when the traveling speed change lever is in a position other than the neutral position, the mobile agricultural machine suddenly started after starting the engine, which was extremely dangerous. Therefore, the present invention provides a safety device for a mobile agricultural machine that prevents the engine from starting when the main clutch lever is "on" and the travel speed change lever is in a position other than the neutral position when the engine is stopped. That is the purpose.

[0004]

The present invention provides the following safety device for a mobile agricultural machine in order to achieve the above objects. In other words, it is a safety device installed in a mobile agricultural machine equipped with an engine and equipped with a main clutch lever and a travel speed change lever, in which a switch that is turned on in conjunction with the "on" of the main clutch lever and a travel speed change lever are neutral. A switch that turns on when it is not in the position,
This is a safety device in a mobile agricultural machine, which is composed of a switch that is turned on when the engine is stopped, and these are connected in series.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings by taking a management machine as an example of a mobile agricultural machine. First, the management machine (A) shown in FIG. 3 will be described. A fuel tank (1) and an engine (2) are mounted on the front part of the machine body of the management machine (A), and power is supplied from the engine (2) to the traveling mission section (3) via an interlocking belt (4). It is designed to communicate. The traveling mission unit (3) is provided with a mission case (5), and wheels (6) are connected to the lower end of the mission case. The handle (7) extending to the rear of the fuselage has a main clutch wire (8).
The main clutch lever (9) for moving the is installed upright, and the main clutch lever (9) can be turned on and off by hand.

On the other hand, the traveling speed change lever (10) is mounted in the vicinity of the handle (7) so that the forward speed and the reverse speed can be switched. FIG.
Shows a guide groove (11) of the traveling speed change lever (10), and the guide groove (11) has a horizontal H-shape. This H-shaped guide groove (11) is the first forward speed (F1),
Second speed (F2) switching groove (11a) and forward third speed (F3)
) And the reverse (R) switching groove (11b) are communicated with each other by the neutral groove (11c).
0) is operated along the H-shaped guide groove (11) and the speed change lever (10) is swung downward, the first speed (F1) and the second speed (F2), and when swung upward, the third speed (F3). ) And reverse (R), respectively.

According to the present invention, the main clutch lever (9) is installed in the steering wheel (7) and the traveling speed change lever (10) is installed in the vicinity of the handle in the management machine (A). 9) is in the "ON" state, and
A safety device for preventing the engine (2) from being started when the travel speed change lever (10) is in a position other than the neutral position (N) is obtained by electrical means.

Therefore, first, the engine stop device shown in the schematic circuit diagram of FIG. 2 will be described. The engine stop device is composed of a circuit including a switch (S) that is turned on and off in conjunction with an engine stop switch (not shown) mounted on the handle (7), When this switch (S) is closed and the circuit forms a closed circuit, the current flows to the one with smaller resistance.
In mobile agricultural machines such as management machines equipped with a gasoline engine, the function of the engine ignition coil is stopped, and the engine is stopped. According to the present invention, a circuit composed of another switch is connected to such an engine stop circuit so that the engine cannot be started under a certain condition.

FIG. 1 is a schematic circuit diagram of a safety device according to the present invention. A switch (S1) is a switch which is turned on and off in synchronization with "on" and "off" of a main clutch lever (9). , Switch (S2) is the speed change lever (1
It is a switch that is turned on when 0) is in a position other than the neutral position (N). Further, the switch (S3) is a pressure switch arranged in the crankcase of the engine (2), and operates by utilizing the fact that the inside of the crankcase of the engine (2) becomes negative pressure during operation. It is a switch that is off when the engine (2) is in operation and on otherwise. And these switches (S1
), The switch (S2) and the switch (S3) are connected in series, respectively, and are connected to the engine stop circuit as shown in FIG. Therefore, when the engine is stopped, the main clutch lever (9) is "on",
When the traveling speed change lever (10) is in a position other than the neutral position (N), the switches (S1, S2, S3) shown in FIG.
) Are all turned on, and the circuit constitutes a closed circuit regardless of the engine stop device, so that the engine (2) cannot be started.

According to the present invention, the engine (2) is started when the main clutch lever (9) is in the "on" position and the traveling speed change lever (10) is in a position other than the neutral position (N). The switch (S1) and the switch (S2), as well as the switch (S
3) is connected in series because the main clutch lever (9) is set to "on" after the engine is started, and the travel speed change lever (10)
This is because the control device (A) is also moved by putting it in a position other than the neutral position (N), so that the engine (2) stops in the circuit composed of only the switch (S1) and the switch (S2). Therefore, by providing the switch (S3) which is always turned off during the engine operation as described above, it is possible to prevent the circuit of the safety device from becoming a closed circuit.
Even if the switches (S1, S2) are turned on during operation, the engine (2) is not stopped.

As described above, according to the safety device of the present invention, when the engine is stopped, the main clutch lever is "on",
If the travel speed change lever is not in the neutral position, all switches (S1, S2, S3) will be closed and a closed circuit similar to the engine stop circuit will be configured, so the engine will automatically start. You can't let it happen. Therefore, when starting the engine, there is no danger of the mobile agricultural machine suddenly starting, and the engine can be safely started. A pressure switch (S3) provided in the crankcase of the engine is used to determine whether the engine is in the operating state or in the stopped state. When the engine is in the operating state, the switch (S3)
Is off, that is, in the open state, the circuit is prevented from becoming a closed circuit, and the engine is prevented from stopping. Therefore, even if the main clutch lever is set to "on" and the traveling speed change lever is set to a position other than the neutral position after the engine is started, the engine does not stop.

Since the safety device of the present invention can be implemented simply by newly disposing and connecting a plurality of switches in the engine stop circuit, it does not require a mechanical structure and is simple and electrically. Since it operates, it is possible to prevent erroneous operation due to human error. Further, the present invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified in design within the spirit of the present invention.

[0013]

According to the present invention, when the engine is stopped, the engine cannot be started when the main clutch lever is in the "on" state and the travel speed change lever is in a position other than the neutral position. Therefore, it is possible to prevent the danger caused by the sudden start of the mobile agricultural machine.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram showing a safety device of the present invention.

FIG. 2 is a schematic circuit diagram of an engine stop device.

FIG. 3 is a side view showing the entire management machine.

FIG. 4 is an explanatory view of a guide groove of a traveling speed change lever.

[Explanation of symbols]

 A Management Machine S Switch 1 Fuel Tank 2 Engine 4 Belt 5 Mission Case 6 Wheels 7 Handle 8 Main Clutch Wire 9 Main Clutch Lever 10 Travel Gear Lever 11 Guide Groove

Claims (1)

[Claims] 1. A safety device provided on a mobile agricultural machine equipped with an engine and equipped with a main clutch lever and a travel speed change lever, the switch being turned on in conjunction with the "on" of the main clutch lever, and the travel speed change. A safety device in a mobile agricultural machine, comprising a switch that is turned on when the lever is not in the neutral position and a switch that is turned on when the engine is stopped, and these are connected in series.