JPH0524699U - Forklift truck work machine circuit breaker - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to prevent the work equipment from operating when the driver is away from the driver's seat and to ensure safety. [Structure] When switches are operated by a plurality of operating levers 6 provided in the vicinity of the driver's seat 3, signals from these switches are sent to the main body circuit, and the main body circuit causes the working machine 2 to operate.
In a working machine circuit of a forklift truck in which the work machine circuit is controlled, the working machine circuit is provided with a working machine circuit disconnecting switch 13 for cutting off the working machine circuit when the driver leaves the driver's seat 3. When the driver leaves the driver's seat 3, the working machine circuit is automatically cut off.
Even if the operating lever 6 is touched by mistake, the working machine 2 does not start carelessly, which is safe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work machine circuit breaker for a forklift truck that automatically shuts off the work machine circuit when the driver leaves the driver's seat.

[0002]

[Prior Art]

 Conventionally, a forklift truck has a working machine that can be operated from the driver's seat, and this working machine is used for cargo handling work.

Further, as shown in FIG. 3, the work machine circuit for controlling the work machine has a plurality of switches a, b, and c which can be operated from the driver's seat. For example, when the switch a is operated, the switch a is operated. A signal is sent to the main body circuit (not shown) from the main body circuit, and the main body circuit is controlled to lift the fork of the work machine.

[0004]

[Problems to be solved by the device]

 In the conventional work machine circuit described above, the work machine operates when the switch a is operated even when there is no person in the driver's seat. For this reason, for example, when the driver is working between the vehicle body and the mast during the cargo handling work and the switch a is accidentally operated, the working machine starts to move carelessly and the driver is in danger. There was a problem. The present invention was made in order to improve the above-mentioned problems, and provides a working machine circuit disconnecting device for a forklift truck that prevents the working machine from operating when the driver leaves the driver's seat to improve driver safety. It is something to try.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, this invention operates switches by operating a plurality of operating levers provided near the driver's seat, and signals from these switches are sent to the main circuit to control the work machine. In the working machine circuit of the forklift truck, the working machine circuit cutoff switch is provided to cut off the working machine circuit when the driver leaves the working machine circuit.

[0006]

[Action]

 With the above-mentioned configuration, even if the driver accidentally touches the operation lever while he / she is working from the driver's seat, the work implement does not start carelessly, thus ensuring the safety of the driver. .

[0007]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. Figure 1 shows a perspective view of the forklift truck near the driver's seat, and Figure 2 shows the working machine circuit. In FIG. 1, reference numeral 1 denotes a vehicle body of a forklift truck, which includes a mast at the front part, a fork vertically attached to the mast, a lift cylinder that vertically moves the fork, a reach cylinder that moves back and forth, and a tilt cylinder that adjusts the fork angle. A working machine 2 (not shown) is mounted, and a driver's seat 3, a steering wheel 4 and a brake pedal 5 for controlling the traveling of the vehicle body 1, and a working machine 2 are operated at the rear of the vehicle body 1. A plurality of operating levers 6 and the like are provided.

The operating lever 6 is connected to a plurality of switches 7, 8, 9, 10 provided in the working machine circuit shown in FIG. 2 so that these switches 7 can be turned on and off. At the same time, these switches 7 are connected to a main circuit (not shown) via a connector 11.

Further, a working machine circuit disconnecting switch 13 and a push button switch 14 for restarting operation are provided in parallel in the middle of the common circuit 12 connected to each switch 7. The work machine circuit disconnecting switch 13 is provided below the floor plate 3a of the driver's seat 3 shown in FIG. 1, and when the driver rides on the floor plate 3a of the driver's seat 3, it is turned on by the weight of the driver. When the driver gets off the floor plate 3a, it is turned off.

To explain the operation, when the driver gets on the floor plate 3a of the driver's seat 3 to start the cargo handling work, the working machine circuit break switch 13 is turned on by the weight of the driver. In this state, for example, when the switch 7 is turned on by the operation lever 6, a signal from the switch 7 is sent to the main body circuit, and the main body circuit controls the lift cylinder so that the fork of the working machine 2 is lifted.

When the driver gets out of the driver's seat 3 for work reasons, the work machine circuit disconnecting switch 13 is turned off. Therefore, even if the driver accidentally touches the operation lever 6 while working between the vehicle body 1 and the mast, the working machine 2 does not operate, and the driver's safety can be ensured. Depending on the work, it may be desired to operate the work implement 2 without getting on the driver's seat 3. At this time, the work is restarted by pressing the pushbutton switch 14 provided in parallel with the work implement circuit breaker switch 13. be able to.

[0012]

[Effect of the device]

 As described in detail above, this device has a working machine circuit disconnection switch that automatically shuts off the working machine circuit when the driver leaves the driver's seat. Even if the operator touches the operation lever by mistake while entering and working, the work implement does not start to move, thus ensuring the safety of the driver. If a pushbutton switch is provided in parallel with the working machine circuit disconnection switch, the working machine can be operated by pushing the pushbutton switch even when the driver is away from the driver's seat, which will hinder work. Nothing.

[Brief description of drawings]

FIG. 1 is a perspective view showing the vicinity of a driver's seat of a forklift truck according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a working machine circuit according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional working machine circuit.

[Explanation of symbols]

 2 Working machine 3 Driver's seat 6 Control lever 13 Working machine circuit breaker switch

Claims (2)

[Scope of utility model registration request] 1. When a switch 7 is operated by a plurality of operating levers 6 provided near the driver's seat 3, signals from these switches 7 are sent to a main body circuit, and the main body circuit controls the working machine 2. In the working machine circuit of the forklift truck, the driver's seat 3
A working machine circuit breaker for a forklift truck, which is provided with a working machine circuit breaker switch 13 for breaking the working machine circuit when the driver is further away. 2. The driver's seat 3 is provided on the work machine circuit disconnecting switch 13.
The working machine circuit breaker according to claim 1, wherein pushbutton switches (14) that can operate the working machine (2) even if they are further apart are connected in parallel.