JP2005247141A - Safety frame of work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform work excellent in reliability by securely protecting a worker with a safety frame in various works performed by the worker as a work vehicle rider. <P>SOLUTION: In a work vehicle, the safety frame is composed of a lower frame and an upper frame, which is connected with the lower frame so as to freely rising up and fall down. A derricking motion sensor detecting derricking state of the upper frame is provided on either the lower frame or the upper frame, and an engine stop means stopping the drive of an engine at falling down of the upper frame. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a safety frame for a work vehicle such as a tractor that is equipped with a farm work machine or an earth work machine to perform farm work or earth work.

  In a work vehicle such as a tractor, there is a technology in which a safety frame is arranged in a undulating manner at a position behind the driver's seat in order to protect an operator sitting in the driver's seat when the vehicle body falls. (For example, see Patent Document 1)

Japanese Patent Laid-Open No. 7-25302

  However, in a work vehicle having a safety frame that can be raised and lowered as described above, the work may be performed even when the safety frame is in a lying state. In this case, the operator in the driver's seat is protected by the safety frame. There is an inconvenience that the work can not be performed safely.

  Therefore, the present invention provides a safety frame comprising a lower frame and an upper frame, and in a work vehicle in which the upper frame is connected to the lower frame so as to be able to be raised and lowered, the undulation sensor for detecting the undulation state of the upper frame is used as the lower frame or the upper frame. And an engine stop means for stopping the driving of the engine when the upper frame falls down.

  Further, an engine continuation means is provided for continuing the engine drive when the upper frame is overturned while the engine is being driven.

  Thus, according to the present invention, in the work vehicle in which the safety frame is composed of the lower frame and the upper frame and the upper frame is connected to the lower frame so as to be able to be raised and lowered, the undulation sensor for detecting the undulation state of the upper frame is provided. Provided on either the frame or the upper frame and engine stop means to stop the engine drive when the upper frame is overlaid, so that the engine is stopped when the upper frame of the safety frame is in the overlying state before starting work. The engine is driven when the upper frame is in a standing state, and a good work is performed while the operator is reliably protected by the safety frame during the work.

  In addition, when the upper frame falls while the engine is running, engine continuation means is provided to continue driving the engine, and when the upper frame needs to fall, for example, when the garage of a work vehicle is taken in or out, the upper frame is Even if the vehicle is laid down, it continues to drive without stopping the engine that has been turned on once, so that the work can be performed in the state where the upper frame is laid down to improve workability.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a side view of the entire tractor. In FIG. 1, reference numeral 1 denotes a tractor which is an agricultural work vehicle. Left and right front wheels 4 and 4 are installed on both left and right sides of a bonnet 3 in which an engine 2 is installed. A steering wheel 5 is provided behind the steering wheel 5, a driver's seat 6 is disposed behind the steering wheel 5, rear wheels 7 are installed on the left and right outer sides of the driver's seat 6, and a mission case 8 below the driver's seat 6. A three-point link mechanism 9 for connecting various working machines is installed, and an operator is seated on the driver's seat 6 to perform various operations.

  As shown in FIGS. 2 to 4, a gate-shaped safety frame 10 is provided on the rear side of the driver's seat 6. The safety frame 10 is composed of a lower frame 11 and an upper frame 12. The base ends of the lower frame 11 are fixed on both sides, and the upper frame 12 is connected to the bracket 13 having a U-shape in plan view of the lower frame 11 via a support shaft 14 so as to be raised and lowered.

  Further, the bracket 13 is provided with two upper and lower pin holes 15 and 16 for holding the upper frame 12 in an upright or lying down posture, and a restriction plate 12 a fixed to the base end of the upper frame 12 and an upper end of the lower frame 11. The bracket 13 to be installed is connected and fixed by the support shaft 14 and a knock pin 17 inserted into one of the pin holes 15 or 16, and the upper frame 12 is held in a standing or lying posture by the knock pin 17. Yes.

  Further, a undulation detection switch 19 as a undulation sensor is provided at the upper end of the lower frame 11 via a switch base 18, and an operation plate 20 for turning on the detection switch 19 when the upper frame 12 stands is provided at the lower end of the upper frame 12. The undulation state of the upper frame 12 is detected by the on / off operation of the detection switch 19.

  As shown in FIG. 5, when the detection switch 19 is turned off, the fuel supply valve of the fuel supply unit 21 of the engine 2 is closed to stop the driving of the engine 2, and the key switch 23 and the detection switch 19 are connected to the battery 22. And the fuel supply unit 21 and the display device 26 are connected to the key switch 19 via the relay switch 25 of the relay 24 in a parallel circuit. Is detected, fuel is supplied to the engine 2 to start the engine 2 and the standing state of the upper frame 12 is displayed on the operation panel or the like.

  Further, as shown in FIG. 6, when the self-holding relay switch 27 of the relay 24 is connected to the parallel circuit between the key switch 19 and the relay 24 and the engine 2 is driven once with the upper frame 12 standing up. Then, even if the upper frame 12 is laid down and the detection switch 19 is turned off, the switch 25 is kept on by the self-holding relay switch 27 to supply fuel to the engine 2 to continue driving the engine 2. In the case of the configuration of FIG. 6, when the engine 2 is turned on once, even if the upper frame 12 is fallen down, the engine 2 is kept in a driving state, and work in a state where the upper frame 12 is fallen down such as putting in and out of a garage is enabled. Can do.

  In the above-described embodiment, the configuration in which the fuel supply unit 21 of the engine 2 is controlled by the detection switch 19 is shown. However, the travel control mechanism of the tractor 1 may be controlled to stop traveling when the detection switch 19 is turned off. good.

  As is clear from the above embodiment, in the working vehicle in which the safety frame 10 is composed of the lower frame 11 and the upper frame 12, and the upper frame 12 is connected to the lower frame 11 so as to be raised and lowered, the upper frame 12 is raised and lowered. Is provided with either a lower switch 11 or an upper frame 12 and a relay 24 which is an engine stop means for stopping the driving of the engine 2 when the upper frame 12 is overturned. Thus, the engine 2 is stopped when the upper frame 12 of the safety frame 10 is in a lying state, such as before the start of work, and the engine 2 is driven when the upper frame 12 is in a standing state, and the safety frame 10 is used to ensure the driving operator during the work. Good work with protection.

  Further, since the self-holding relay switch 27 is provided as an engine continuation means for continuing driving of the engine 2 when the upper frame 12 is tilted while the engine 2 is being driven, the upper frame 12 needs to be tilted. When the tractor 1 is put in and out of the garage, even if the upper frame 12 is laid down, the engine 2 that has been applied once can be continuously driven without being stopped, and the upper frame 12 can be operated in the laid state. Thus, workability can be improved.

The external side view of a tractor. Side surface explanatory drawing of a safety frame part. Explanatory drawing of the raising / lowering part of a safety frame. Explanatory drawing which shows the fall state of an upper frame. The electric circuit diagram of an engine drive. The electric circuit diagram of an engine drive.

Explanation of symbols

2 Engine 10 Safety frame 11 Lower frame 12 Upper frame 19 Detection switch (undulation sensor)
24 relay (engine stop means)
27 Relay switch (engine continuation means)

Claims (2)

  In a work vehicle in which the safety frame is composed of a lower frame and an upper frame, and the upper frame is connected to the lower frame so that it can be raised and lowered, a undulation sensor for detecting the undulation state of the upper frame is attached to either the lower frame or the upper frame. A work vehicle provided with engine stop means for stopping the driving of the engine when the upper frame falls down.   2. The work vehicle according to claim 1, further comprising engine continuation means for continuing driving of the engine when the upper frame falls while the engine is being driven.

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