JPH0720159Y2 - Safety equipment for aerial work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a safety device that eliminates forgetting to lock a lifeline in an aerial work vehicle.

(Prior Art) An aerial work vehicle is one in which a bucket is attached to the tip of a boom, and a worker carries the work on this bucket. It is designed to be locked to a lifeline locking device provided in place. By doing so, the worker does not have a risk of falling and can perform a safe work.

(Problems to be solved by the invention) Even if a lifeline locking device is provided, it was possible to move the work vehicle at a height without locking the end of the lifeline. There is a risk of falling if the worker performs unstable work such as leaning out of the bucket and working.

The present invention, except for the above-mentioned drawbacks, operates an alarm or restricts the movement of an aerial work vehicle when the worker forgets to lock the end of the lifeline to the lifeline lock. It is a thing.

(Means for Solving Problems) In order to achieve the above-mentioned object, the safety device for an aerial work vehicle of the present invention is provided with a lifeline 3 in the vicinity of the lifeline locking tool 4 provided at an appropriate position of the bucket 6. A lifeline lock detecting means 2 for detecting that the end 1 is locked is provided, and when the lifeline lock detecting means 2 does not detect that the lifeline lock detecting means 2 is in a locked state, an alarm device is activated or an aerial work vehicle. Is configured to be restricted by the unload valve 5.

(Operation) According to the above configuration, by simply adding a simple device to the conventional aerial work vehicle, the aerial work vehicle can be operated normally only when the lifeline of the worker is locked to the lifeline locking device. If it is not locked, the movement of the aerial work vehicle is restricted.

(Embodiment) An embodiment of a safety device for an aerial work vehicle according to the present invention, FIG.
And it demonstrates based on FIG.

In FIG. 1, a bucket 6 is provided with a lifeline lock 4, and a swivel base 7 is provided with an unload valve 5.

FIG. 2 shows the details of the relationship between the part of the lifeline locking tool 4 and the unload valve 5, and detects that the end 1 of the lifeline 3 is locked by the lifeline locking tool 4. As described above, the lifeline lock detection means 2 is provided. This lifeline lock detection means 2
Signal, the unload valve 5 provided in the discharge oil passage of the drive hydraulic power source (pump) of the aerial work vehicle operates. In this embodiment, the lifeline lock detecting means 2 is composed of a proximity switch whose end 1 is a detection target.

Next, the operation will be described. First, a case where the end portion 1 of the lifeline 3 is locked to the lifeline locking tool 4 as a normal working state will be described. In this case, the lifeline lock detecting means 2 detects the lock,
Since the unloading valve 5 is set to the on-load state, the normal operation of the aerial work vehicle is not restricted.

Next, when the end portion 1 of the lifeline 3 is not locked to the lifeline locking tool 4, the lifeline locking detection means 2 detects non-locking, so that the unload valve 5 is in an unloading state. Therefore, even if the operation valve is switched, the circuit pressure does not rise and the work vehicle at a high place does not move even if it tries to operate.

In the above embodiment, the unload valve 5 is used when the lifeline is not locked.
Is set in the unloading state to limit the movement of the work vehicle, but the alarm device may be operated instead of the unloading valve 5.

(Effects of the Invention) The safety device for an aerial work vehicle of the present invention configured and operated as described above allows a worker to attach a lifeline to a lifeline locking device by simply adding a simple device to the conventional aerial work vehicle. Since the aerial work vehicle can only operate when it is locked to, it is possible to prevent accidents of falling of workers, and to deepen the bucket to reduce the risk of falling while sacrificing workability and entry / exitability. In contrast, the conventional workability and getting on and off are still maintained,
It has a great effect.

[Brief description of drawings]

FIG. 1 is an illustration of an aerial work vehicle, and FIG. 2 is an illustration of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... End part, 2 ... Lifeline locking detection means, 3 ... Lifeline, 4 ... Lifeline locking tool, 5 ... Unload valve, 6 ... Bucket, 8 ... Boom,

Claims (1)

[Scope of utility model registration request] 1. A lifeline locking tool for attaching a bucket to the tip of a boom, and detachably locking the end of the lifeline equipped by an operator on the bucket at a proper position of the bucket or at a proper position of the tip of the boom. In an aerial work vehicle in which a lifeline lock detection means for detecting whether the lifeline is locked or not locked to the locking tool is provided near the locking tool, the lifeline locking detection means A safety device for an aerial work vehicle, which is configured to activate an alarm or limit the movement of the aerial work vehicle when it detects that the lifeline is not locked.