JPS6220349Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an operation structure for a safety switch in a riding agricultural machine such as an agricultural tractor.

Generally, in agricultural tractors, etc., for safety reasons, the start switch can only be turned on when the clutch is disengaged. A safety switch is used that is turned on by However, in the past, the switch operating member for closing the safety switch was provided on the interlocking mechanism between the clutch petal and the clutch, and therefore, if the interlocking mechanism became unstable, the closing operation of the safety switch would be interrupted. There was a fear that the system would go awry and the operation could no longer be performed reliably.

Therefore, in this proposal, the actuating plate of the safety switch is installed independently on the boss of the clutch, rather than in the interlocking mechanism, so that the actuating plate is operated directly when the clutch pedal is depressed. This is to ensure that operations can be performed reliably.

The present invention will be explained below based on embodiments shown in the drawings.

A is an agricultural tractor as a riding agricultural machine, and an engine 3 is provided at the front of a traveling body having two front wheels 1, 1 and two rear wheels 2, 2.
The transmission is configured to transmit the power from the engine to the transmission 5 via the clutch 4, and from the transmission 5 to the travel drive mechanism and the actuator drive mechanism. Reference numeral 6 is a control section provided in the center of the aircraft body, 7 is a control handle, 8 is a driver's seat, 9 is a clutch petal, and 10 is a step. Reference numeral 11 designates a safety switch in the present structure, which is mounted rearward on a plate 12 horizontally disposed on the lower surface of the step 10 and above a boss 9' of a clutch pedal, which will be described later. FIG. 3 is a switch circuit diagram of the safety switch 11, in which 13 is a battery, 14 is a start switch, and 15 is a start motor. Reference numeral 16 denotes a switch operating plate for closing the safety switch 11, and is provided upright on the boss 9' of the clutch petal 9 so as to face the safety switch 11. What is indicated by 17 in the figure is an interlocking mechanism between the clutch petal 9 and the clutch 4. A transverse arm 18 is provided on the boss 9 of the clutch petal 9, and an interlocking rod 1 is attached to the transverse arm 18.
One end of the rod 19 is connected to the clutch lever 20, and the other end of the rod 19 is connected to the clutch lever 20. In the past, it was common to provide the interlocking rod 19 of the interlocking mechanism 17 with a switch operating plate. Therefore, the switch actuating plate 16 in the present invention is not provided on the interlocking mechanism 17, but is provided upright independently on the boss 9. Also, 21 is a stopper that restricts the operating range of the clutch pedal 9, and 22 is a tension spring that urges the clutch pedal 9 upward.

Therefore, when starting the tractor A, the safety switch 11 is in the OFF state before the clutch pedal 9 is depressed, so even if the start switch 14 is turned on in this state, the engine 3 will not start. It is not possible. On the other hand, when the clutch pedal 9 is depressed, the boss 9 of the clutch petal 9 rotates due to this depression, and the operating plate 16 erected thereon rotates in the direction of arrow a, turning the safety switch 11 ON. In order to do this, the switch circuit is closed, and then when the start switch 14 is turned on, the start motor 15 rotates and the engine 3 is started. At the same time, when the clutch pedal 9 is depressed, the power from the engine 3 is cut off by the clutch 4, so the engine 3 can be started safely. When the safety switch 11 is turned on by the actuating plate 16, since the actuating plate 11 is erected on the boss 9 of the clutch pedal 9,
The actuating plate 16 can be actuated directly by this depressing operation of the clutch pedal 9, and the closing operation can be ensured.

According to the present invention, the safety switch is protected from obstacles below by the clutch pedal boss, thereby preventing damage.

In addition, although it is below the step, it is located above the clutch pedal boss, so scattered soil from below does not adhere to and accumulate on the switch and the switch operating plate, preventing malfunctions due to scattering. .

The steps are also protected from rainwater from above and mud falling from the top of the steps.

Furthermore, although the safety switch is sufficiently protected as described above, it is exposed at the bottom of the step, so it cannot be easily seen from below during inspection and maintenance work. The above work is easy.

In particular, the switch operating plate for operating the safety switch can be used independently and exclusively for operating the clutch pedal boss without having other functions, and an interlocking mechanism etc. can be installed between the pedal boss and the switch. Since there is no intervention, uncertain operation due to rattling of the mechanism is prevented, and therefore the structure is simplified and the operation is ensured at the same time.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing an agricultural tractor according to an embodiment of the present invention, FIG. 2 is a side view showing a switch operation structure of the present invention, and FIG. 3 is an electrical circuit diagram of the safety switch. A: Agricultural tractor, 3: Engine, 4: Clutch, 9: Clutch petal, 9': Boss, 11: Safety switch, 14: Start switch, 1
6: Switch operation plate.

Claims (1)

[Scope of utility model registration request] A safety switch 11 is provided in the electric circuit of the start switch 14, and the safety switch 11
The safety switch 11 is disposed between the boss 9' of the clutch pedal 9, which is pivotally supported below the step 10, and the lower surface of the step 10. Then, move the switch actuating plate 16 that is brought into contact with the safety switch 11 to
An operation structure for a safety switch in an agricultural tractor, etc., characterized in that the safety switch is independently erected on the upper surface of a boss 9'.