JP2908235B2 - Safety equipment for aerial work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an aerial work vehicle, and more particularly, to a safety device for protecting a workbench of an aerial work vehicle of a vertical lift type.

[0002]

2. Description of the Related Art For example, as an aerial work vehicle capable of moving an operator and luggage to a desired height, a work table is mounted on a vehicle body via a scissor link, and the scissor link is moved by a telescopic cylinder. There is a vertical lifting type aerial work vehicle configured to be operated to raise and lower a work table. In such an aerial work vehicle, the vehicle is driven to a position below a desired work position, and the work table is raised. The movement of the position can also be performed. After the work is completed, the workbench is lowered by retracting the telescopic cylinder and stored on the vehicle body.

[0003]

Here, when the vehicle body is run with the work table raised, an obstacle such as a beam may be located below the work table. in this case,
If the operator lowers the work table without noticing the obstacle, the work table and the obstacle come into contact with each other, and there is a problem that the work table and the like are damaged if the work table is further lowered.

[0004] The present invention has been made in view of such a problem, and an object of the present invention is to provide a safety device for an aerial work vehicle capable of preventing a worktable from being damaged.

[0005]

In order to achieve the above object, a safety device for an aerial work vehicle according to the present invention comprises a workbench holding member provided to be able to move up and down with respect to a vehicle body. A workbench is attached, and a load detecting means for detecting a load acting in a direction to push up the workbench is provided between the workbench and the workbench holding member. The detected load of the worktable detected by the load detecting means by the controller is compared with a preset set load, and when the detected load exceeds the set load, an alarm signal is output, and the alarm signal is output. It also has an alarm means for receiving an alarm and performing an alarm operation.

According to the safety device for an aerial work vehicle configured as described above, when the work table and an obstacle interfere with each other when the work table is lowered, a load acts in a direction to push up the work table, The load is detected by load detecting means. The detected load detected by the load detecting means is compared with a permissible load preset by the controller, and when the detected load exceeds the permissible load, a warning signal is transmitted from the controller. This warning signal is input to the warning means. Then, an alarm is given by an alarm buzzer or an alarm lamp, or an alarm is given by stopping the descending operation.

[0007] In order to achieve the above object, a work platform and a work platform are provided in a work platform constructed almost similarly to a work platform equipped with a safety device for a work vehicle constructed as described above. Load detecting means for detecting a load acting on the work table in the lateral direction may be provided between the table holding member and the table holding member. According to the safety device for an aerial work vehicle configured as described above, when the work platform and an obstacle interfere with each other when the aerial work vehicle is run, a load acts in a lateral direction of the work platform, and The load is detected by the load detecting means. The detected load detected by the load detecting means is compared with an allowable load set in advance by the controller, and when the detected load exceeds the allowable load, a warning signal is transmitted from the controller,
A warning similar to the above is given, or the running of the vehicle is stopped.

Further, in each of the aerial work vehicles configured as described above, the load detecting means may be configured to be able to detect the load acting in the direction of pushing down the work table. Accordingly, in addition to the case where the load on the work table is increased, when the upper surface of the work table interferes with an obstacle when the work table is raised, the load is detected by the load detection unit. The detected load detected by the load detecting means is compared with an allowable load set in advance by the controller, and when the detected load exceeds the allowable load, an alarm signal is transmitted from the controller, and an alarm similar to the above is performed, Stop the raising operation of the platform.

Further, in each of the aerial work vehicles configured as described above, when the alarm signal is transmitted from the controller, the operation of raising and lowering the work table is stopped by the lifting device operation restricting means. May be. Thereby, when the alarm signal is transmitted from the controller, the operation of the elevating device can be regulated separately from the alarm operation by the alarm buzzer and the alarm lamp by the alarm means.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, a crawler type aerial work vehicle provided with an aerial vehicle safety device according to the present invention will be described with reference to FIG. This aerial work vehicle 10 includes a body 1
A crawler-type traveling device 12 is provided on the left and right sides of the vehicle 1, and the traveling device 12 is configured to run freely. A scissor link 13 is mounted on the vehicle body 11, and a workbench holding member 14 is mounted on an upper end of the scissor link 13. The workbench 15 is disposed on the workbench holding member 14 via a load cell (load detecting means) 21. The scissor link 13 is vertically expanded and contracted by an elevating cylinder 17, and the work table 15 is vertically moved in accordance with the elongation and contraction of the elevating cylinder 17.

The work table 15 is provided with a handrail 16 for protecting a worker on the work table 15. An operation device 18 is attached to the handrail 16.
The worker on the work table 15 controls the lifting and lowering operation of the work table 15 (expansion / contraction operation of the telescopic cylinder 17) and the traveling device 12
The traveling control operation is performed. An operation signal from the operation device 18 is transmitted to the controller 30 as shown in FIG. 3, and controls the drive of the telescopic cylinder 17 and the traveling device 12 via an alarm means 31 described in detail later.

In the aerial work vehicle configured as described above, a certain limit is imposed on the load that can be loaded on the work table 15 in order to ensure stability during traveling and safety of the scissor link 13 and the like. The limited loading load is defined as a predetermined loading load. This load is detected by a load cell 21 provided between the workbench holding member 14 and the workbench 15. The detected load is compared with a predetermined load by the controller 30, and when the detected load exceeds the predetermined load, the controller 30 sends an alarm signal to the alarm unit 31. The alarm means 31 that has received the alarm signal operates the operating device 1 to ensure safety.
Regardless of the operation signal from 8, the operation of the traveling device 12 and the telescopic cylinder 17 is stopped, and an operation signal is transmitted to the alarm buzzer 32 to sound an alarm by sounding the buzzer.

As described above, the load cell 21 is
5, it is possible to detect not only the load (load acting in the direction of pushing down the work table 15) but also the load acting in the direction of pushing up the work table 15. Here, when the vehicle body 11 is run when the work table 15 is raised, an obstacle such as the beam 51 may be located below the work table 15 against the intention of the worker,
In this case, when the work table 15 is directly lowered in the arrow direction, the lower surface 15a of the work table 15 and the beam 51 come into contact. Then, when the work table 15 is further lowered, a load acts on the work table 15 in a direction of pushing up the work table 15 from below by a reaction force from the beam 51.

The load cell 21 detects a load acting in a direction to push up the work table 15, and the detected push-up load is
The controller 30 compares the detected push-up load with the predetermined push-up load. When the detected push-up load exceeds the predetermined push-up load, the controller 30 sends an alarm signal to the alarm means 31. And
In the same manner as described above, the retracting operation of the telescopic cylinder 17 is stopped by the alarm means 31 and the alarm buzzer 32 is sounded to alert the worker to prevent the work table 15 and the beam 51 from being damaged. Here, the predetermined push-up load is the work table 15 in a state where nothing is loaded on the work table 15.
May be set to the same load as the load of. However, in order to further improve safety, the detected load (load or push-up load) of the load cell 21 when the lowering operation of the work table 15 is started is stored in the controller 30, and when the detected load changes (load). The controller 30 may be configured to transmit an alarm signal to the alarm unit 31 when the load decreases or the push-up load increases).

Furthermore, the direction of the load that can be detected by the load cell 21 is not limited to the push-up or push-down direction.
The load acting on the working table 15 in the lateral direction may be configured to be detectable. According to the aerial work vehicle 10 configured as described above, the load cell 21 further moves the vehicle body 11 in the direction of the arrow despite the fact that the front surface 15b of the worktable 15 is in contact with the beam 51 as shown in FIG. , The load acting on the work table 15 in the lateral direction is detected. Here, during normal work, a load in the lateral direction does not act on the work table 15. Therefore, when the load cell 21 detects a load in the lateral direction, the controller 30 transmits an alarm signal to the alarm means 31 so that the work table 15 and the like can be prevented from being damaged.

In the above embodiment, the case where the safety device according to the present invention is applied to a vertical lifting type aerial work vehicle using the scissor link 13 has been described, but the present invention is not limited to this. Instead, the present invention can also be used in an aerial work vehicle using a lifting device constituted by a plurality of telescopic posts.

In the above embodiment, the alarm means 3
Although the alarm buzzer 32 is sounded by the operation signal from 1, the display lamp may be turned on to alert the worker. In the above-described embodiment, the operation of the telescopic cylinder 17 is stopped by the alarm unit 31 that has received the alarm signal from the controller 30. May be configured to stop the operation of the telescopic cylinder 17 when is transmitted to the lifting device operation restricting means. This allows
The operation of the telescopic cylinder 17 can be stopped when the raising / lowering operation is further performed despite the warning by the warning sound.

[0018]

As described above, the safety device for an aerial work vehicle according to the present invention includes load detecting means for detecting a load acting in the direction of pushing up the work table between the work table and the work table holding member. Has been established. Then, the detected load of the worktable detected by the load detecting means by the controller is compared with a preset set load, and when the detected load exceeds the set load, an alarm signal is output, and upon receiving this alarm signal, It also has alarm means for performing an alarm operation.

Thus, when the work table and the obstacle interfere with each other when the work table is lowered, the load acting in the direction of pushing up the work table is detected by the load detecting means, and the allowable load set in advance by the controller is set. Is compared to And when the detected load exceeds the allowable load,
An alarm signal is transmitted from the controller, and an alarm is given by an alarm buzzer by an alarm means, or an alarm is given by stopping the descending operation. For this reason, even if the worker performs the lowering operation of the work table even though the lower surface of the work table is in contact with the obstacle, the work table is not damaged.

Further, according to the safety device for an aerial work vehicle, comprising load detecting means for detecting a load acting in the lateral direction of the work table between the work table and the work table holding member, When the work table and the obstacle interfere with each other when the work vehicle is run, a load acts on the work table in a lateral direction, and the load is detected by the load detecting means. The detected load detected by the load detecting means is compared with an allowable load preset by the controller, and when the detected load exceeds the allowable load, a warning signal is transmitted from the controller.
Then, the alarm is activated by the alarm means in the same manner as described above, so that damage to the worktable can be prevented.

Further, in each of the aerial work vehicles constructed as described above, if the load detecting means is configured to be able to detect the load acting in the direction of pushing down the work table, the work table is raised. A load when the upper surface of the work table interferes with an obstacle during operation is detected by the load detecting means. The detected load detected by the load detecting unit is compared with an allowable load set in advance by the controller,
When the detected load exceeds the allowable load, a warning signal is transmitted from the controller, and a warning operation is performed by the warning means. Therefore, it is possible to prevent the work table and the lifting device from being damaged, and to ensure the stability of the aerial work vehicle.

Further, in each of the aerial work vehicles configured as described above, when the warning signal is transmitted from the controller, the operation of raising and lowering the work table is stopped by the lifting device operation restricting means. May be. Thereby, when the alarm signal is transmitted from the controller, the operation of the elevating device can be regulated separately from the alarm operation by the alarm buzzer and the alarm lamp by the alarm means.

Further, in a case where the raising and lowering operation is stopped by the elevating device operation restricting means when the alarm signal is transmitted from the controller, when the alarm signal is transmitted from the controller. In addition, the operation of the elevating device can be regulated separately from the alarm operation by the alarm buzzer and the alarm lamp by the alarm means.

[Brief description of the drawings]

FIG. 1 is a side view of an aerial work vehicle equipped with a safety device according to the present invention.

FIG. 2 is a side view of the aerial work vehicle.

FIG. 3 is a block diagram of operation control of the aerial work vehicle;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Body 12 Running device 13 Scissor link 14 Workbench holding member 15 Workbench 21 Load cell (load detecting means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-124800 (JP, A) JP-A-63-154600 (JP, A) JP-A-6-10298 (JP, U) JP-A 61-154 139999 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B66F 9/00-11/04

Claims (4)

(57) [Claims] 1. A workbench holding member provided to freely move up and down in a vertical direction with respect to a vehicle body, a workbench attached to the workbench holding member, and a workbench and the workbench holding member Disposed between the load detecting means for detecting a load acting in a direction to push up the work table, and comparing the detected load of the work table detected by the load detecting means with a predetermined load, A controller for outputting an alarm signal when the detected load exceeds the predetermined load; and alarm means for receiving an alarm signal from the controller and performing an alarm operation. Safety equipment for work vehicles. 2. A workbench holding member movably provided in a vertical direction with respect to a vehicle body, a workbench attached to the workbench holding member, and a workbench and the workbench holding member. A load detecting means disposed between the working table and detecting a load acting on the work table in a horizontal direction; comparing the detected load of the work table detected by the load detecting means with a predetermined load, A controller for outputting an alarm signal when the detected load exceeds the predetermined load; and alarm means for receiving an alarm signal from the controller and performing an alarm operation. Safety equipment for work vehicles. 3. The safety of an aerial work vehicle according to claim 1, wherein the load detecting means is configured to detect a load acting in a direction of pushing down the work table. apparatus. 4. The apparatus according to claim 1, further comprising a lifting device operation restricting means for receiving an alarm signal from said controller and restricting operation of said lifting device.
4. A safety device for an aerial work vehicle according to (1).