DE8912280U1 - Pivoting drive-over bridge for ramps - Google Patents

Description

Our No. 26 298

Van Wijk Nederland B.V.

Bouwweg 14 NL-8203 AA Lelystad

Pivoting overhead bridge for ramps

The subject of the innovation is a drive-over bridge for ramps with a bridge plate that can be pivoted around a horizontal axis at its ramp-side end, which has an extension that can be pivoted out and in or moved in to rest on the platform to be loaded or unloaded and allows it to be lowered to a great extent.

In known crossing bridges, the bridge is secured in the resting state by the fact that the swing-out bridge extension rests in so-called lip catchers, which are attached to supports arranged under the bridge. The bridge rests on these supports in the lowered state after the extension is extended. The range of movement of the bridge downwards is therefore limited by the height of the supports. If you want to increase the lowering of the bridge, you have to shorten the support, but at the same time lengthen the swing-out extension in order to be able to support the bridge safely in the resting state.

The aim of the innovation is to increase the lowering range of the crossing bridge without having to extend the bridge

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must be made longer. For this purpose, it has already been proposed in DE-GM 88 09 230 to make the supports pivotable. This requires the supports to be attached with an appropriate mechanism to the lower frame or floor under the bridge, where they are heavily exposed to the weather.

An improvement is achieved by attaching the supports to the bridge itself rather than to the lower frame. When at rest, the supports are then vertical and the bridge rests on the lower frame with these supports. When the bridge is raised and the extension is folded out or extended, the supports rotate through mechanical force transmission.

"·; into a position almost parallel to the bridge platform. The

:: ^: The overpass bridge can now be moved unhindered to the lowest position

% tion can be reduced.= If the extension is switched on again

,· folded or retracted, gravity and mechanical

Reset elements ensure that the supports return to the

&Ggr; gear position rotated perpendicular to the bridge platform

% and thus ensure the secure rest position again.

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_; ~ The drawings show an embodiment of the

' Innovation further explained:

Figure 1 shows the object of the innovation with a fold-out extension and a reset by means of clamping elements in the resting state.

Figure 2 shows the bridge with the support turned away &iacgr; before pivoting into the lowest position, which is also

;"r if indicated.

t The platform (1) of the dock leveller is raised by a (not

shown) horizontal axis hydraulically or in other

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The extension (3) is mounted at its front end so that it can rotate around the axis (2) and can be swiveled to the level of the bridge platform by a hydraulic or other drive (not shown). When at rest, this extension (3) hangs vertically downwards due to gravity.

One or more supports (5) are attached to the platform (1) so that they can rotate on the axle (6) that is mounted in the abutments (7) and are rigidly connected to the axle (6). The axle (6) can rotate freely in the abutments (7) attached to the platform (1). The lever arms (8) and (9) are also attached to the axle (6). The rotational movement of the supports (5) is limited on the one hand by the platform (1), against which the supports rest with their upper side in a vertical position, and on the other hand by the rotational movement of the lever (9).

A pull cable (14) is attached to the lever (9) and an abutment (13) on the extension (3). This causes the lever arm (9) to rotate around the axis (6) in the direction of the end of the bridge platform when the extension (3) is unfolded, and at the same time the supports attached to the axis (6) are rotated into a position almost parallel to the bridge platform, as shown in Figure 2.

In order to achieve the greatest possible rotational movement of the supports (5), an element (12) is attached to the extension (3), which deflects the pull cable (14) when the extension (3) is unfolded and thus causes a further rotation of the lever arm (9).

The platform (1) can be swivelled downwards after folding away the supports (5) until it meets the abutment (15) of the lower frame (4). This means that very

- 4 large height differences are bridged.

One or more levers (8), which like levers (9) are firmly connected to the axis (6), are connected to further abutments (10) of the platform (1) via one or more tensioning elements (11). The tensioning element (11) has stretchable elements, such as one or more spiral springs. By folding out the extension (3), the levers (8) are also rotated by turning the axis (6) and thus tension the tension elements (11) so that they are always under tension when the supports (5) are folded away.

If the extension (3) folds back into the vertical rest position, no force acts on the lever arm (9). At the same time, the tension elements (11) pull the levers (8) in the direction of the platform abutment (10). The axle (6) and supports (5) are rotated back. If the bridge platform is raised above the horizontal level, the supports rotate over the limit (16) of the frame abutment (15) until the top of the supports meets the bottom of the platform (1). The supports (5) are now again at right angles under the platform (1). Lowering the platform (1) restores the rest position of the loading bridge shown in Figure 1, the platform (1) is firmly supported again.

Preferably, a raised portion (16) attached to the ramp-side end of the abutment (15) of the frame (4) prevents the supports (5) from being pushed away against the ramp side when at rest.

Instead of the return element for the supports consisting of the lever (8), the tensioning element (11) and the abutment (10), other equivalent technical designs are also possible. The return can be effected by a counterweight that is fixed to the axle (6).

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It is also possible to bring about the resetting by means of a leaf, torsion or spiral spring acting on the axle (6). The tensioning element fastened in the abutment (10), which has an expansion element near the abutment (10), can also be fastened to the axle (6) or to a roller firmly connected to it, so that the tensioning element is rolled up there when the supports are swung away.

If the dock leveler has a retractable and extendable extension, the solution principle discussed above can also be used. The pull cable attached to the extendable extension and the lever (9) must then have an expansion element, such as a tension spring, to enable the extension to be pushed out even when the supports (5) have already been completely swung away. The element (12) is not required in this case.

Claims (1)

Protection claims 1. A drive-over bridge (1) pivotable about a horizontal axis at the ramp-side end with a fold-in and extendable or retractable and extendable extension (3) for placing on the platform to be loaded and unloaded and one or more supports (5) for supporting the bridge in the rest position, characterized in that 1.1 the supports (5) are firmly connected to an axle (6) that can rotate freely in abutments (7) attached to the dock leveller (1), 1.2 lever arms (9) are also rigidly connected to the axle (6), || 1.3 between the outer end of the lever arm (9) and ?|i one on the extension (3) of the bridge If attached abutment (13) a tension element (14) P is tensioned and fs _: - 1.4 a return element is present which supports || _ä (5) into the starting position perpendicular to the ^fö - bridge platform can be turned back. Il 2. Overpass bridge according to claim 1, characterized in that || the return element consists of a with the axis (6) p fixed lever (8) and a between this Lever (8) and one on the bridge platform (1) H attached abutment (10) tensioned tension element (11) I exists. H 3. crossing bridge according to claim 1, characterized in is that the return element consists of a on the abutment (10) ;i: the tension element (11) attached to the bridge platform jv-, whose other end is connected to the axis (6) or a H is attached to a roller firmly connected to it. 4. Crossing bridge according to claim 2 or 3, characterized in that the tension element (11) is a tension spring or contains a tension spring. 5. Crossing bridge according to claim 1, characterized in that the restoring element is a leaf, torsion or spiral spring acting on the axle (6). 6. Crossing bridge according to claim 1, characterized in that the return element is a counterweight attached to the lever arm (8) firmly connected to the axle (6). 7. Crossing bridge according to one of claims 1 to 6, characterized in that a deflection element (12) is attached to the extension (3), over which the tension element (14) runs. 8. Crossing bridge according to one of claims 1 to 6, characterized in that an expandable element is arranged in the tension element (14). 9. Crossing bridge according to claim 8, characterized in that the stretchable element is a tension spring. 10. crossing bridge according to »ircem of claims 1 to 9, characterized in that abutments (15) are arranged in the lower frame (4), on which the supports (5) stand in the rest state and which serve as a stop for the lowest position of the bridge platform. 11. Crossing bridge according to one of claims 1 to 10, characterized in that an elevation (16) is attached to the ramp-side end of the abutment (15).