JPS58216842A - Transship bridge for pit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention provides a bridge plate supported in a pit so as to be able to pivot around a horizontal axis at its rear end, and a platform for loading and unloading cargo placed at the free end of this bridge plate. The bridge plate has a retractable extension for a downwardly directed pivot position, and the bridge plate is equipped with a limit switch for a downwardly directed pivot position, which limit switch is used for the planar lift corresponding to the bridge plate pit surface. There are four transfer bridges for the pit.

Although the reverse movement of the bridge plate towards the so-called zero position has already been successful, difficulties arise when loading low vehicles. The platform of the vehicle is lowered by deflecting the elastic part. The limit switch can be operated under strict assumptions. The drive or lifting device of the bridge plate is actuated to move the bridge plate into the zero position. This is a dangerous argument. This is because there may be conveyors or people on top of the vehicle.

The basic object of the invention is to avoid the above-mentioned disadvantages and to prevent the bridge plate from moving upwards or into the zero position unexpectedly when it is in a low position.

In this invention, this is accomplished by a device that monitors the usage status of the bridge. The device tube is used to deactivate the limit switch. Jin's device is particularly sensitive to the "usage condition" of the extension part.
In particular, the position is monitored and the limit switches are influenced accordingly.

This is realized in particular electrically, for example by short-circuiting the limit switch as an electrical switch. Certain properties of the bridge are then exploited, especially when the bridge extension comes into contact with the platform. The extension undergoes a small pitch due to unavoidable play, resulting in a gap. The extension is probed and the sensor (Taster)
If the switch is coupled to an electrical switch, this switch can affect the limit switch. Normally, there will be no gap if the bridge is still in operation and is supported on the platform by the weight of its head.

If there is no gap, it will affect the landing path so that the limit switch is turned off. In the case of a swivelingly mounted extension, the dead use status indicator is activated depending on the swivel position of the extension. If this extension is still folded and still in this position, then the effect of the limit switch according to the invention will occur. In the case of an extension with a pivotable pawl, the end swivel position is used, and in the case of a retractable extension (in the longitudinal direction of the bridge plate), the front ml gap is available.

The transfer bridge constructed as described above takes into consideration the unavoidable switching process that requires a clearing due to the operation of the limit switch. That is, in this invention, accurate control is achieved by the above-described configuration.

It also belongs to the invention to monitor the operating state even if the bridge is supported at its lowest point on a fixed bearing in the pitch cavity accommodating the bridge. In this case, if the bridge has a removable extension, the bridge should be supported so that the support base acts on the extension as follows. This means that no gap formation that would affect the operating status indicator occurs, and that the support can be provided in such a way that even in the final position, the bridge plate does not automatically pivot into the zero position.

In addition, a delay member (low-pass filter) of the transfer bridge control device 4cId is provided as follows. That is, the delay element prevents short-term undesirable effects (such as the above-mentioned gap type due to vibrations).

A more detailed explanation will be given based on the drawings showing examples.

A box-shaped bridge plate 1 is mounted at its rear end so as to be pivotable about a transverse axis 2 in a pit 6 having a cutout 4, a pit edge 5 and a working plane 6t. At the front end of the bridge plate 1, there is an extension part 8 which can be moved back and forth in the longitudinal direction of the Y-bridge by means of a slider 7. This extension is movable by means of cylinders 9 and serves to support the bridge deck 1 on the loading and unloading platform 10 of a vehicle in the following cases: This is the case when the bridge is in use and therefore the bridge deck 1 can enter into motion as the height of the platform 10 changes. To ensure that this effect always occurs, the bridge is set to have a slight head weight.

Cylinder 1 as hydraulic working cylinder for lifting
A lifting device with 1 is available.

The invention derives from the recognition that a small gap 8 between the bridge plate 1 and the slide 7 with the extension 8 is created if the extension 8 is not supported on the platform 10 for the support of the bridge plate 1. set off.

In order to sense this gap θ, a usage status indicator 12 is provided. The annunciator is located on the lower side of the bridge board 1, serves as an electric switch, and has a sensor 13 in contact with the slider.
is supplemented by

Furthermore, a limit switch 14 is also provided. This limit switch is also mounted on the side surface of the bridge so that it can come into contact with a stopper 15 fixed to a support 16 provided in the notch 4 as a terminal stopper for the bridge. This limit switch 14 necessarily has a constant switching stroke.
influences the control, so that the operating diameter bridge plate 1 of the limit switch 14 is moved upward by the cylinder 11, that is, returned to the so-called zero position. At this zero position, the surface of the bridge plate 1 is the action plane 6
matches.

When the bridge is in the operating condition shown in FIG. 1, i.e. near its lower end in a condition in which actuation of the limit switch 14 may occur, the gap 8 does not occur. This is because the extension 8 rests on the platform 10.

The annunciator 12 detects this and turns off the limit switch 14. This limit switch cannot issue a command to a control member or the like to lift up the bridge board 1.

When the platform 10 is lowered by further loading the platform 10, the support base 16 is finally lowered.
comes into effect. However, in that case the bridge is not supported, as it were, on the bridge plate 1, but via the extension 8 or the slide 7 on this support 16. This also prevents the formation of gaps.

Even if these assumptions are F, that is, the extension 8 no longer contacts the platform 10, the bridge plate 1 will not automatically rise.

When the transshipment work is completed, the bridge plate 1 is simply lifted by the operator's definite command, which means pressing the operating button.

In the embodiment shown in FIG. 3, the annunciator 17 is activated by rotating the lever 18.

The lever 18 is actuatable via a lever 20 which is fixedly connected to the pivotable extension 8 . The structure in that case is as follows. That is, when the swing of the extension part 8 is within the range indicated by a, the notification device 17 does not activate the limit switch 14.

On the other hand, when the extension 8 is at rest (range b
), the limit switch 14 can be activated at any time.

It should be noted that when the gap 8 is created or when the extension 8 is in range, the limit switch 140 command will only take effect if the protection time has expired. This is particularly important in the following cases: That is, if the bridge is still in operation and abnormal conditions, such as mechanical vibrations or collisions, create a gap θ for a short time or the extension is out of range. That is, this delay in control is a safety measure and the annunciator 12 or 17 will not take effect.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the transfer bridge in operation, Figure 2 is a plan view of the transfer bridge in Figure 1, and Figure 3 is the front of the bridge plate with the extension of the bridge in Figure 1 pulled out. FIG. 4 is a longitudinal sectional view of the front part of the bridge plate with the bridge extension having the removable extension. Reference numeral 1 in the figure... Bridge plate 7... Slider 8... Extended portion 9... Cylinder 10... Platform 11... Cylinder 12... Usage status indicator 13... Sensor 14... Limit switch 15... Stone -16... Support base

Claims (1)

[Scope of Claims] (Ribbit: A bridge plate supported at its rear end so as to be swingable about a horizontal axis along a rib, and a free end ζ of the bridge plate placed on and supported on a cargo transfer platform. The bridge plate has a retractable extension, and the bridge plate is provided with a limit switch which causes the bridge plate to assume a downwardly rotating position. A device (12
, 17), and is configured such that the limit switch does not operate due to this device. (2) A transfer bridge according to claim (2) in which the device (12)' is a sensor for determining changes in play (gap days) of the extension (8). ). (4) The limit switch is an electric switch, and this electric switch also has a limit switch connected to the limit switch by electrical series. (14) A transfer bridge according to claim 1, which is provided with an electric switch for stopping the action of The transfer bridge according to claim (1) or (2), wherein the transfer bridge is configured such that the extension portion (8) or the slider (7) connected thereto is in contact with each other so that no gap is generated. (6) Announcer (When 1υ places the extension part (8) in the non-use position and the small angle range in front of it, φ only does not work, and the transfer bridge described in the range (3) of the special request for FM. (7) The extension part (8) is mechanically connected, for example, to the connecting frame (1).
9) The transfer bridge according to claim (3) or (6), wherein four devices (17) are connected. (8) The scope of the claim (
The transfer bridge mentioned above. (9) A transfer bridge according to claim (5), wherein the bridge plate (1) is lifted by a control member raised by an operator. (10) Delay time The transfer bridge according to claim (1) or i'1 (81), wherein the action of the limit switch (14) is stopped by the device (12).