JPH0720160Y2 - Safety equipment for order picking lift trucks - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is an order picking lift truck in which a driver's cab rises and descends together with a fork. It relates to a safety device for protection.

(Conventional device) In the conventional order picking lift truck, an emergency stop switch is provided in the driver's cab, and the ascending and traveling circuits are cut off by operating the emergency stop switch except for the descending circuit.

(Problems to be solved by the invention) Conventionally, as described above, except for the descending circuit, the elevating and traveling circuits are cut off by operating the emergency stop switch. If the switch did not recover, the cab continued to descend and was extremely dangerous.

In order to prevent this, the operation of the emergency stop switch may be configured to disconnect not only the ascending / traveling circuit but also the descending circuit. In this case, for example, if the emergency stop switch is operated when the ascending circuit is abnormal, the cab However, there was a problem that the driver could not descend from the order picking lift truck. For example, in the current situation where order picking lift trucks are often used in freezer / refrigerator warehouses, this is a major issue that may lead to serious accidents that may be fatal to the driver, such as being left behind in the warehouse. there were.

(Means for Solving the Problem) A safety device for an order picking lift truck of the present invention (hereinafter, referred to as a device of the present invention) is an order picking lift truck in which a driver's cab ascends and descends together with a fork. A circuit breaker that disconnects the power supply by operating the emergency switch on the driver's cab is connected to the control circuit for raising and lowering the vehicle and the traveling control circuit, and an emergency lowering switch is provided on the driver's cab, and the emergency lowering switch is installed. The above problem has been solved by arranging a relay that connects only the lowering control circuit to the power supply by operating the switch.

(Embodiment) An embodiment of the device of the present invention will be described with reference to the drawings.

Reference numeral 1 is an order picking lift truck, which raises and lowers both a cab 2 and a fork 3.

Reference numeral 4 denotes an operating device provided on the cab 2. The operating device 4 is provided with a normal lowering switch 11, an emergency switch 5 (alternate type) and an emergency lowering switch 6 (momentary type). .

Since the emergency down switch 6 is not always used, it does not have to be provided at the same place as the emergency switch 5. Reference numeral 7 is a control circuit, and the control circuit comprises an ascending control circuit 7A, a descending control circuit 7B, a traveling control circuit 7C and an emergency stop circuit 7D. If an abnormality occurs in the running or ascending / descending circuit, the emergency switch 5 on the driver's cab 2 is operated to turn off the excitation to the breaker 8 and connect it to the power supply (not shown) at its contact 8A. Stop the car. After that, if the emergency lowering switch 6 is operated together with the lowering switch 11, the contact 9A of the relay 9 is activated, and the power source (not shown)
And the exciting coil 10 of the electromagnetic switching valve of the hydraulic circuit (not shown) is excited to operate the electromagnetic switching valve (not shown) from the bottom side of the lift cylinder (not shown). The pressure oil is discharged, the cab is lowered, and the driver can get out of the car.

(Effects) The device of the present invention has the above-described configuration, so that even when the down switch does not recover due to freezing due to freezing or refrigerating warehouse, the emergency down switch can be operated. The driver has a great safety effect that he / she can definitely get on the ground.

[Brief description of drawings]

FIG. 1 is a side view of an order picking lift truck equipped with the device of the present invention, and FIG. 2 is an electrical connection circuit diagram of the device of the present invention. 1 …… Order picking lift truck 2 …… Driver cab 3 …… Fork 5 …… Emergency switch 6 …… Emergency down switch 7 …… Control circuit 7A …… Up control circuit 7B …… Down control circuit 7C… … Running control circuit 8 …… Circuit breaker 8A …… Contact 9 …… Relay 9A …… Contact 10 …… Exciting coil of electromagnetic switching valve 11 …… Normal lowering switch

Claims (1)

[Scope of utility model registration request] 1. An order picking lift truck in which a driver's cab moves up and down together with a fork, and a control circuit for raising and lowering the driver's cab and the fork is cut off by disconnecting a power supply by operating an emergency switch of the driver's cab. A safety device for an order picking lift truck, in which an emergency down switch is provided on the driver's cab, and a relay for connecting only the down control circuit to the power source is arranged by operating the emergency down switch.