JPH01214600A - Front substance detector for parent/child lift - Google Patents

Abstract

PURPOSE:To accurately detect the relative position of a child lift with respect to a substance in the forward direction by providing, at legs of the child lift, two sensors detecting that a leg has a specified or near distance with respect to the substance, and operating a display according to the respective detections. CONSTITUTION:A sensor mounting unit 12 is set on the tip end of a leg 8 of a child lift 4. The unit 12 is provided with a photosensor 13 detecting when the leg 8 approaches a substance at a specified distance in the forward direction, and a proximity switch 14 detecting when it comes to a position near the substance. When the sensor 13 is operated, a pilot lamp 19 on the lift 4 or parent lift is put on, and a plot lamp 23 is put on by the operation of the switch 14. It is thus possible for an operator to confirm the position near the substance so as to accurately facilitate the loading even if he is apart from the leg 8 of the lift 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a remote controller 1 and a controller 1 for lifting and lowering members of a forklift main body (hereinafter referred to as a parent lift) corresponding to a parent lift.
The present invention relates to a parent-child lift that is removably equipped with a child lift called a roll pallet truck (hereinafter referred to as child lift), and specifically relates to a device for detecting the approach distance of a child lift to an object in front during loading of cargo.

(Prior Art) A parent-child lift is used, for example, when loading and unloading a shipping container.
Such parent-child riff i~ is, for example, disclosed in Japanese Patent Application Laid-Open No. 51-85
This method is disclosed in Japanese Patent Publication No. 153 and Japanese Patent Application Laid-open No. 7181/1983.

In general, a parent-child lift, as shown in the schematic diagram of Fig. 8,
A child lift 4 is attached to a hook 5 on a lift bracket 1-3 as an elevating member that is moved up and down along the mass l-2 of the parent lift 1.
It is a removable type that is moored via. The child lift 4 has a drive unit 7 having an oil motor as a drive source on its main body 6 side, and a leg 8 corresponding to a fork.
Each side is provided with auxiliary wheels 9 that are operated to raise and lower via links, and furthermore, although not shown, a drive unit 7 is provided.
It is equipped with a power steering cylinder for steering the main lift 1 and a lift cylinder for raising and lowering the legs 8, and supply and discharge of hydraulic oil to and from the hydraulic actuator can be carried out by a hose reel 10 installed on the main lift 1. This is done via the hose 11 that is let out. That is, the child lift 4 itself is equipped with a lifting device, a traveling device, and a steering device necessary for cargo handling work, and by remotely controlling these devices on the main lift 1 side, it can move inside the transport container C as shown in the figure. Then, the container C is loaded and unloaded.

(Problem to be Solved by the Invention) By the way, the above-mentioned cargo handling work inside a shipping container using a sub-lift is often carried out far from the driver's seat and in a closed room. When loading cargo, it is extremely difficult to confirm the relative position of the child lift (the next cargo to be stowed) with respect to the front inner wall of the container or objects in front of it, such as cargo that has already been stowed, especially in deep places. However, in the past, special equipment for this purpose was not provided, and therefore the operator's judgment as to whether or not the cargo was being stowed in a favorable condition depended solely on the intuition of the operator, which required considerable skill. It is required.

If proper stowage is not carried out, the efficiency of stowage will be reduced, and in some cases, the cargo may be pushed against walls or cargo at high speed, causing damage to them.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that is effective in confirming the relative position of a sub-lift with respect to an object in front of the sub-lift during loading work using the sub-lift.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a parent-child lift in which a child lift attached to an elevating member of a parent lift is separated from the parent lift to carry out cargo handling work. is provided with a first sensor that detects when the child lift approaches the object in front of it to a predetermined distance, and a second sensor that detects that the child lift approaches the object in front of it to a closer distance. a first display that operates in response to a detection operation by the first sensor, and a second display that operates in response to a detection operation by the second sensor, on either the side or the parent lift side; The gist of the present invention is to provide a device for detecting and displaying the approaching distance of the child lift to the object in front of it step by step.

(Function) Therefore, while on the driver's seat of the parent lift, the operator remotely operates the child lift while checking the relative position to the object in front using the first display and second display installed on the child lift or the parent lift. can be operated.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. The overall schematic structure of the parent-child lift is the same as the conventional one as shown in FIG. 8, so the same reference numerals are given to the same constituent members and the explanation thereof will be omitted. As shown in FIG. 1, the child lift in this embodiment is equipped with three legs 8, and a distance detection sensor is installed at the tip of each leg 8 via a sensor fixture 12. ing. That is, as shown in FIG. 4, the sensor fixture 12 is formed into a downward groove shape that is approximately the same shape as the leg 8, which has a spiral cross section, and is fixed to the tip of the leg by welding. An optical sensor 13 for intermediate distance detection is attached to the left and right sensor mounts 12, and a proximity switch 14 for close distance detection is attached to the left and right sensor mounts 12.

The optical sensor 13 uses a five-lens distance measuring type capable of detecting a distance of about 1 meter, for example, and is installed with bolts 15 while being accommodated in a groove of the sensor mounting tool 12, as shown in FIG. , its lower side is protected by guard plays 1-16.

On the other hand, the proximity switch 14 can detect a distance of about 10 seconds, and as shown in FIG.
The bracket 17 is housed in the groove of the sensor mount 12 through the bracket 17. The bracket 17 projects downward by a predetermined length and also serves as a guard member for the sensor.

Therefore, the optical sensor 13 detects the intermediate hole 1I where the distance from the front end of the child lift 4 to the object in front is about 1TrL, for example.
11X (see FIG. 2), and is connected to a power source 20 via a relay 18 to light a colored (for example, yellow) pilot lamp 19 as shown in FIG. Proximity switch 14 to child lift 1 4
The front end of is closest to the object in front 1111tY (see Figure 3)
The color (for example, green) pyrower 1 is activated via the AND element 22 and the relay 21.
- Connected to the power source 20 so as to light the lamp 23. Both pilot lamps 19 and 23 as position indicators are mounted on the rear surface of the main body 6 of the child lift 4 at a position where they can be easily seen from the driver's seat of the main lift 1, as shown in FIG.

Incidentally, in a normal case, loading into the transport container C is carried out using a cargo storage box 24 as shown in FIG.

This luggage storage box 24 is a rectangular box made of iron with a width slightly smaller than the inner width of the container C, and has an insertion opening 24a for the legs 8 at the bottom, and three
Handled in stacks. Therefore, when the leg 8 of the child lift 4 is lifted up, that is, when the auxiliary wheels 9 are raised as shown in FIGS. 2 and 3, the optical sensor 13 and the proximity switch 14 are The height of the cross member 24b is set so as to detect the lower cross member 24b of the luggage storage box 24 placed in the lower cross member 24b.

This embodiment is constructed as described above, and therefore, in order to load the cargo storage boxes 24 loaded on the legs 8 of the child lift 4 into the container C, the child lift [ 4 is remotely controlled to run inside the container C, as shown in FIG.
That is, when approaching the pre-loaded luggage storage box 24 (the inner wall at the back of the container C during the first loading) and reaching the intermediate distance X, the optical sensor 13 of the central leg 8 detects the luggage storage box 24.
cross member 24b (or container wall) is detected, and the yellow pilot lamp 1 is activated via the relay 18 accordingly.
9 lights up, and based on this, the operator reduces the traveling speed of the child lift 4, and then slowly moves it forward. Then, in this low speed state, as shown in Fig. 3, the leg 8
approaches the object in front to a close distance Y, and the left and right proximity switches 14 touch the cross member 24b of the luggage storage box 24 (
When the green pilot lamp 23 is detected via the AND element 22 and the relay 21, the operator stops the movement of the child lift 4 and places the cargo storage box 24 on the spot. stow.

That is, the operator, while on the driver's seat of the main lift 1, uses the two types of pilot lamps 19.2 provided on the child lift 4.
The relative position of the sub-lift 4 with respect to the object in front is judged while visually checking whether the sub-lift 4 is lit or not, and the deceleration and stop of the sub-lift 4 are controlled, so that the cargo can be stowed at an appropriate position.

In addition, during the above-mentioned loading operation, if the child lift 4 is not parallel to the luggage storage box 24, which is the object in front,
In other words, when the position is diagonal, the left and right proximity switches 14
Either one of the two remains away from the cross member 2.4 b and does not operate, and the green pilot lamp 23 for displaying close range detection does not light up. can be stacked in an appropriate state by redoing the work.

FIG. 6 shows an example in which the sensor for detecting close range is changed from a proximity switch to a limit switch 25. In this case, the detection roller 25a is configured to rotate around the horizontal axis, and the detection roller 25a is configured to rotate around the horizontal axis. This is intended to protect against the R-lowering motion of the leg 8 while in contact with the leg 8. When the limit switch 25 is used, the relay 21 can be omitted, which is advantageous in terms of operation.

In addition, the modified example shown in FIG.
Pilot lamp 23L corresponding to L and 14R respectively
, 23R are provided. That is, distance detection and display are performed separately on the left and right sides of the child lift 4.

Therefore, with such a configuration, it is possible to confirm the direction of inclination when the sub-lift 4 is oblique with respect to the object in front of it, making it easy to correct the attitude of the sub-lift 4.

Further, although not shown, the legs 8 of the child lift 4 are not limited to the three-legged type shown in the figure, but may be two on the left and right. In that case, the optical sensor 13 for intermediate distance detection
can be attached to either the left or right leg 8. In addition, the scales of the sensor are not limited to those shown in the figure, and can be changed as necessary. The display is not limited to a lamp, and may be displayed using a sound such as a buzzer, and its installation position is not limited to the child lift 4, but may be installed on the main lift 1 side.

(Effects of the Invention) As detailed above, according to the present invention, when loading a container or the like by remotely controlling a child lift from the driver's seat of a parent lift, Since the traveling speed and stopping position can be controlled remotely while checking the position, it is possible to prevent damage to the objects in front by avoiding the secondary lift pushing the cargo against the object at high speed, and to prevent the cargo from being damaged by proper stowage. Efficiency can be increased, and stowage work can be carried out efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view, Fig. 2 is a sectional view showing details of the mounting part of the optical sensor for intermediate distance detection, and Fig. 3 is the mounting part of the proximity switch for close range detection. 4 is a perspective view showing the sensor attachment, FIG. 5 is a block diagram showing the process of detecting and displaying a front object, and FIG. 6 is a modified example of the close-range detection sensor. A sectional view, FIG. 7 is a plan view showing an example of a change in the display method,
FIG. 8 is an overall schematic side view showing the parent-child lift, and FIG. 9 is a perspective view illustrating a luggage storage box used for cargo handling work of containers. 1... Parent lift 4... Child lift 8...
Leg 13... Optical sensor 14... Proximity switch 19... Pylon 1 to lamp 23... Pilot lamp Applicant Toyota Industries Corporation Representative Patent attorney Hidehiko Okada (3 others) Figure 9

Claims (1)

[Claims] In a parent-child lift that performs cargo handling work by separating a child lift attached to the lifting member of the parent lift from the parent lift, the legs of the child lift have a first device that detects when the child lift approaches an object in front of it to a predetermined distance. A sensor and a second sensor for detecting that the child lift has approached an object in front at a closer distance are provided, and a sensor is provided on either the child lift side or the parent lift side for the detection operation by the first sensor. A first indicator that operates in response to the detection operation and a second indicator that operates in response to the detection operation by the second sensor are provided, and the approach distance of the child lift to the object in front is detected in stages. A front object detection device for a parent-child lift configured to display images.