JP4832989B2 - Cargo safety equipment for cargo handling vehicles - Google Patents

Description

  The present invention relates to an improvement in a cargo handling safety device that is applied to a cargo handling vehicle such as a skid steer loader and prevents a driver from operating a cargo handling device accidentally when getting on and off.

Conventionally, as a cargo handling safety device of this type of cargo handling vehicle, for example, the one described in Patent Document 1 is known.
This can basically take a seat that is provided on the vehicle body and can be seated by the driver, a restraint position that is provided on the vehicle body and restrains the driver seated on the seat, and an open position that opens the driver. A safety bar, a cargo handling device provided on the vehicle body for performing cargo handling work, an actuator for driving the cargo handling device, a control valve for controlling the actuator, a cargo handling pedal for operating the control valve, It comprises mechanical locking means for locking the cargo handling pedal when the safety bar is in the open position and releasing the lock of the cargo handling pedal when the safety bar is in the restrained position.
Thus, in such a case, when the safety bar is in the open position, the cargo handling pedal and the control valve are locked in the neutral position by the mechanical locking means. Safety can be ensured without operating.

Utility Model Registration No. 2513278

  However, in such a case, a mechanical locking means had to be provided between the safety bar and the cargo handling pedal, so this was not only easy to install due to restrictions on the installation location, but also only the operation of the safety bar. Therefore, the cargo handling pedal and the control valve are mechanically locked at the neutral position, so that the lock state varies depending on the operation of the safety bar, and sufficient safety cannot be ensured.

  The present invention was devised in view of the above-mentioned problems, and was devised in order to solve this problem. The problem to be solved is that of a cargo handling vehicle that can be easily installed and greatly improves safety. To provide cargo handling safety equipment.

  The cargo handling safety device for a cargo handling vehicle according to the present invention basically includes a seat provided on a vehicle body on which a driver can sit, a restraint position provided on the vehicle body and restraining the driver seated on the seat, and the driver. A safety bar that can take an open position to be opened, a cargo handling device that is provided on the vehicle body for carrying out cargo handling work, an actuator for driving the cargo handling device, a control valve for controlling the actuator, and a control valve A cargo handling pedal for operation, a seat detector that detects when the driver is seated on the seat, a safety bar detector that detects that the safety bar is in the restrained position, a seat detector and a safety bar detector Therefore, when the driver is seated on the seat and the safety bar is in the restrained position, the hydraulic oil from the pump is supplied to the control valve and at other times the pump is Lies features a bypass solenoid valve to shut off the flow of hydraulic oil to the control valve, that was formed from.

When the driver is seated on the seat and the safety bar is in the restrained position, these are detected by the seat detector and the safety bar detector, the bypass solenoid valve is controlled, and the hydraulic oil from the pump is controlled by the control valve. Supplied to. Therefore, when the cargo handling pedal is operated, the actuator is controlled by the control valve to operate the cargo handling device. At this time, since the safety bar is in the restraining position, safety can be achieved by preventing the driver sitting on the seat from jumping forward in the event of a collision or the like.
When the driver and the safety bar are other than the above, that is, when the driver is separated from the seat or the safety bar is in the open position, these things are detected by the seat detector and the safety bar detector. The solenoid valve is controlled to cut off the flow of hydraulic oil from the pump to the control valve. For this reason, although the control valve can be operated by the cargo handling pedal, the hydraulic oil from the pump is not supplied to the actuator by the bypass solenoid valve, so even if the driver accidentally operates the cargo handling pedal, the cargo handling device Is never activated.

  The seat detector is a single one provided on the seat, and the safety bar detector is provided on the left and right sides corresponding to the safety bar, and these are in series with the solenoid of the bypass solenoid valve. It is preferable that it is connected to. In this way, the cargo handling device cannot be operated unless the driver is seated on the seat and the left and right safety bars are in the restrained position, so that safety is further improved.

According to the present invention, the following excellent effects can be achieved.
(1) Consists of seat, safety bar, cargo handling device, actuator, control valve, cargo handling pedal, seat detector, safety bar detector, and bypass solenoid valve, especially seat detection that detects when the driver is seated on the seat A safety bar detector that detects that the safety bar is in the restrained position, and when the driver is seated on the seat and the safety bar is in the restrained position, controlled by the seat detector and the safety bar detector. The hydraulic oil from the pump is supplied to the control valve, and at other times, a bypass solenoid valve that shuts off the flow of hydraulic oil from the pump to the control valve is provided. As a result, it can be installed easily and the safety can be greatly improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a cargo handling vehicle to which the cargo safety device of the present invention is applied. FIG. 2 is a front view showing the vicinity of the driver's seat. FIG. 3 is a circuit diagram showing the cargo handling safety device.

The cargo handling safety device 1 is composed mainly of a seat 2, a safety bar 3, a cargo handling device 4, an actuator 5, a control valve 6, a cargo handling pedal 7, a seat detector 8, a safety bar detector 9, and a bypass solenoid valve 10. The present invention is applied to a cargo handling vehicle 50 such as a skid steer loader.
The cargo handling vehicle 50 includes a vehicle body 51, front and rear wheels 52 rotatably provided on the vehicle body 51, a head guard 53 provided on the upper portion of the vehicle body 51 and provided with a protective wire net on a portion excluding the front surface, and And a driver's cab 54 having an entrance at the front.

  The seat 2 is provided on the vehicle body 11 and can be seated by the driver A. In this example, the seat 2 is provided inside the driver's cab 54.

  The safety bar 3 is provided on the vehicle body 2 and can take a restraining position for restraining the driver A seated on the seat 2 and an open position for releasing the driver A. A core 11 having a substantially L-shaped plane including a horizontal piece in the left-right direction and a vertical piece in the front-rear direction; A cushion member 12 covered with a horizontal piece, and a bracket 13 provided on a head guard 53 on the fixed side and supporting a vertical piece of the core member 11 so as to be rotatable around a front-rear axis are provided. 2 is set to a restraining position for restraining the driver A as shown by a solid line in FIG. 2, and when the core member 11 is lifted, the opening position for opening the driver A is set.

  The cargo handling device 4 is provided on the vehicle body 2 for carrying out cargo handling work. In this example, the cargo handling device 4 includes a boom 14 that can be raised and lowered on the vehicle body 2 and a bucket 15 that can be raised and lowered. ing.

  The actuator 5 is for driving the cargo handling device 4. In this example, the actuator 5 is provided between the vehicle body 2 and the boom 14 and lifts the boom 14 between the boom 14 and the bucket 15. And a bucket cylinder 17 for raising and lowering the bucket 15.

  The control valve 6 is for controlling the actuator 5. In this example, the control valve 6 includes a boom control valve for controlling the boom cylinder 16 and a bucket control valve for controlling the bucket cylinder 17. It is.

  The cargo handling pedal 7 is for operating the control valve 6. In this example, the cargo handling pedal 7 includes a boom pedal for operating the boom control valve and a bucket pedal for operating the bucket control valve. Are connected to the boom control valve and the bucket control valve.

  The seat detector 8 detects that the driver A is seated on the seat 2. In this example, the seat detector 8 is a single membrane switch (seat switch) provided on the seat 2. It is turned on when seated in 2.

  The safety bar detector 9 detects that the safety bar 3 is in the restraining position. In this example, the safety bar detector 9 is a left / right limit switch provided in response to the safety bar 3, and the safety bar 3 is restrained. It turns on when it is in the position.

The bypass solenoid valve 10 is controlled by the seat detector 8 and the safety bar detector 9 so that when the driver A is seated on the seat 2 and the safety bar 3 is in the restrained position, the hydraulic oil from the pump 19 is controlled by the control valve. In this example, the four-port two-position electromagnetic switching valve is used, and the primary port is The secondary side port is connected to the control valve 6 while being connected to the discharge side of the pump 19 and the tank 20.
The pump 19 is driven to rotate by a prime mover 21 such as an engine, and the suction side is connected to the tank 20.
Thus, the solenoid 22 of the bypass solenoid valve 10 is connected with a single sheet detector 8 and left and right safety bar detectors 9 in series, and when these three detectors 8 and 9 are all turned on. When the solenoid 22 is excited and the bypass solenoid valve 10 is opened, and when one of the three detectors 8 and 9 is off, the solenoid 22 is demagnetized and the bypass solenoid valve 10 is closed. It is like that.

Next, the operation will be described based on such a configuration.
As shown by the solid lines in FIGS. 1 and 2, when the driver A is seated on the seat 2 and the left and right safety bars 3 are in the restrained position, the seat detector 8 and the left and right safety bar detectors 9 This is detected, the bypass solenoid valve 10 is controlled to open, and the hydraulic oil from the pump 19 is supplied to the control valve 6. Therefore, when the cargo handling pedal 7 (boom pedal or bucket pedal) is operated, the actuator 5 (boom cylinder 16 or bucket cylinder 17) is controlled by the control valve 6 (boom control valve or bucket control valve), and the cargo handling device. 4 (boom 14 and bucket 15) is operated. At this time, since the safety bar 3 is in the restrained position, it is possible to prevent the driver A seated on the seat 2 from jumping forward in the event of a collision or the like, thereby ensuring safety.

  When the driver A and the safety bar 3 are other than the above, that is, when the driver A is separated from the seat 2 or when the safety bar 3 is in the open position as shown by a chain line in FIG. These things are detected by the safety bar detector 9, the bypass solenoid valve 10 is controlled to be closed, the flow of hydraulic oil from the pump 19 to the control valve 6 is shut off, and the control valve 6 to the tank 20. The flow of hydraulic oil is cut off. For this reason, although the control valve 6 (boom control valve or bucket control valve) can be operated by the cargo handling pedal 7 (boom pedal or bucket pedal), the hydraulic oil from the pump 19 is supplied to the actuator 5 (boom cylinder 16 or bucket cylinder 17). Therefore, even if the driver operates the cargo handling pedal 7 (boom pedal or bucket pedal) by mistake, the cargo handling device 4 (boom 14 or bucket 15) will not be activated.

  Since the seat detector 8, the safety bar detector 9, and the bypass solenoid valve 10 are provided to lock the cargo handling device 4 in a so-called electrical and fluid pressure manner, the installation freedom compared to the mechanically locked one. It can be installed easily with a greater degree of safety, and can be securely locked, greatly improving safety.

In the previous example, the membrane detector (sheet switch) is used as the sheet detector 8. However, the present invention is not limited to this, and for example, other types may be used.
The safety bar detector 9 uses a limit switch in the previous example, but is not limited to this, and for example, other devices may be used.

The side view which shows the cargo handling vehicle to which the cargo handling safety apparatus of this invention is applied. The front view which shows a driver's seat vicinity. The circuit diagram which shows a cargo handling safety device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cargo safety device, 2 ... Seat, 3 ... Safety bar, 4 ... Cargo handling device, 5 ... Actuator, 6 ... Control valve, 7 ... Cargo handling pedal, 8 ... Seat detector, 9 ... Safety bar detector, 10 ... Bypass Solenoid valve, 11 ... core material, 12 ... cushion material, 13 ... bracket, 14 ... boom, 15 ... bucket, 16 ... boom cylinder, 17 ... bucket cylinder, 18 ... control rod, 19 ... pump, 20 ... tank, 21 ... Motor, 22 ... solenoid, 50 ... cargo handling vehicle, 51 ... vehicle body, 52 ... wheel, 53 ... head guard, 54 ... cab, A ... driver.

Claims (2)

  A seat provided on the vehicle body that can be seated by the driver, a safety bar that is provided on the vehicle body and that can take a restraint position that restrains the driver seated on the seat and an open position that opens the driver, and a safety bar provided on the vehicle body A cargo handling device for carrying out cargo handling work, an actuator for driving the cargo handling device, a control valve for controlling the actuator, a cargo handling pedal for operating the control valve, and a driver seated on the seat The safety bar detector that detects that the safety bar is in the restrained position, and the safety bar detector that is controlled by the seat detector and the safety bar detector to restrain the safety bar. When set to the position, hydraulic oil from the pump is supplied to the control valve, and otherwise, the flow of hydraulic oil from the pump to the control valve is blocked. Handling safety device handling vehicle, characterized and the bypass solenoid valve, that was formed from. The seat detector is a single one provided on the seat, and the safety bar detector is provided on the left and right sides corresponding to the safety bar, and these are in series with the solenoid of the bypass solenoid valve. The cargo handling safety device for a cargo handling vehicle according to claim 1 connected to the vehicle.

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