DE2026274A1 - Dock leveler - Google Patents

Description

Kurt Alten in Wennigsen am Deister

tjfeer loading bridge

The invention relates to a dock leveler with a rigid plate, which consists of a metallic upper belt, a metallic lower chord and one or more shear-resistant intermediate links arranged on these.

In these bridges, according to known proposals, intermediate members in the form of webs are used, which either integrally formed with the upper or lower belt or are profiled at their ends to with a appropriately profiled upper and lower chord can be positively connected.

The invention is now based on the task of carrying capacity to significantly increase the dock levellers mentioned at the beginning, without having to increase the dead weight of the bridge. The aim is therefore a lightweight dock leveler, in other words, a handy and accident-proof bridge that has a comparatively large load-bearing capacity.

To achieve this object, it is proposed according to the invention to use a hard-set, porous or cellular plastic for the intermediate links, which is firmly connected to the belts. Plastic foams based on PVO, polyurethane or polystyrene or synthetic hard foams made from these goods are preferably used, but especially foams of this type that are foamed in place and steeply in the tree and lower chord can penetrate. These foams enable a simplified production compared to foams that are used as molded bodies for bridge production _e -

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Since these plastics have a sufficiently high shear strength and continue to be due to their porosity or Cellularity only has a low weight, results from a firmly adhering connection between the mentioned Plastics on the one hand and the belts mentioned on the other hand, a comparatively large load-bearing capacity of the bridge, if one uses conventional bridges with the same dead weight for comparison, or with the same load-bearing capacity due to the invention a dock leveler "which is significantly lower weight is more manageable and more accident-proof.

Further details of the invention will be explained with reference to the drawing, shown in the embodiment examples of dock levellers according to the invention are _o drawings%

Fig. 1 shows a portable dock leveler in the Seitenansi ent ₉

FIG. 2 is a partial plan view of the bridge according to FIG. 1,

Figo 3 shows a longitudinal cliait-fe ctar © h the bridge according to Fig »-1 in its upper cross-sectional area,

! 'igο 4 a stationary _P at a ramp hinged dock leveler in the side view ₉

E ⁵ Ig- 5 © la® Partial plan view of the Brüaß® according to Figo 4 _f

P: ». Gc 6 © 3 © S €? £ © lls a stationary dock leveler attached to a ' Rasp hinged and shown in the side view Is and

IfLg-, 7 a section along the line VIl ■ = VII from Figo 6 »

"'■ Λ', known to be bridged with the help of the Überladebziiclcess. The c! Palt 1 -Z ₀ Bo swisehen a gia, be =., Bw ₀ .. eaijlafienänen Fshra @ ug 2 and a ramp 3, 'so Z ₀ B ₀ a floor conveyor equipment traffic su exmöglieii®?! ,, -

331 © dock leveler according to Figo 1 - = ?. 5 consists of several

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BATH ORIGINAL

Light metal profiles that extend in the transverse direction of the bridge. An approximately T-shaped profile 4 is located at the front end of the bridge, it has an extension 4 ¹ for resting on the vehicle 2; At the rear end of the bridge there is a profile 5 with an approximately L-shaped cross-section, the vertical web 5 ^{1 of which is used} for support on the ramp 3. A driveway wedge 6 is also hinged to the profile 5; the pivot axis is at 7.

The two profiles 4, 5 have hook-shaped projections 8 which are appropriately shaped and also hook-shaped for insertion Strip 9 made of light metal. These strips 9 are used to attach light metal plates 1o, 11 by screwing; the screw connection is shown at 12. The two light metal plates 1o, 11 form the upper belt a and the lower belt b of the dock leveler.

Between the upper chord a and the lower chord b results as a result the mutual distance of the straps a cavity, which due to the invention completely with plastic rigid foam is filled on the basis of polyurethane. The foam is also firmly adhered to all adjacent metal surfaces tied together. The adhesive layer is denoted by 13 in FIG. 3, which also reveals the surface profile of the plate 11 serving as the top flange a.

This structure results in a very rigid dock leveler low weight,

In general, those located between the upper and lower chords run Cavities free on both sides; accordingly the dock leveler is laterally partially covered by the foam limited. But it is also possible to cover the side surfaces of the foam 14, which is done by cover plates 15 can. The foam 14 is now covered at the top and bottom and also on both lateral bridge edges.

In the dock leveler according to FIGS. 4 to 7, a bridge plate 16 is hinged at its rear end at 17 to the ramp. The joint located at the front end of the bridge plate 16

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BAD ORiGiNAU

serves for the pivotable mounting of a driveway wedge 19, -over which the bridge is supported on the vehicle 2.

The driveway wedge 19 has an approximately triangular cavity 2o, which extends across the width of the bridge and is filled with a foam made of hard plastic, the is also denoted by 14. Otherwise, the driveway wedge 19 consists of light metal or light metal profiles.

The bridge plate 16 also has a cavity extending practically over the length and width of this plate between the upper chord a and the lower chord b. In contrast to the driveway wedge 19 and the bridge according to FIGS. 1-3 the cavity 2o is not completely filled with the foam. Rather, the two belts stand over foam strips 21 in connection with one another, which preferably extend over the entire width of the bridge plate 16, however only have a width which is significantly less than the length extension of the cavity 2o. Thus several Foam strips 21 are arranged distributed over the length of the bridge, it is also possible in each strip 2o to embed a metal plate 22, which is located about halfway up in the cavity 2o and firmly adhering is connected to the foam, it should be mentioned that, if necessary. Also other plates 22 - all used in parallel and a corresponding arrangement for the dock leveler according to Pig. 1-3 is possible.

According to the embodiment according to Figo 6, 7 is for Bridge plate 16 is provided in a box construction; below a metal plate 23, velche the surface of the bridge plate 16 forms, there are U-profiles 24 with their legs 25 are welded to the underside of the metal plate 23 and extend in the longitudinal direction of the bridge. The resulting Hollow spaces running along the bridge are completely filled with a hard plastic foam, which in turn is firmly adhered to the profile 24 and the metal plate. In this embodiment too, the leads Hartscheum to a considerable stiffening of the bridge plate without any significant increase in its own weight.

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A "particularly favorable embodiment of the inventive Dock leveler results, moreover, when the wall thickness of the upper wall a is greater than that of the lower chord b. The plates 11 used for the top belt a a wall thickness of about 3 - 6 now and the plates 1o for the Get a wall thickness of about 1-3 at the bottom chord.

Due to the invention, additional intermediate links be used between the two belts, but preferably the plastic should only include the one or the other Form intermediate links, like this from the Pig. 1 and 4 can be seen.

Me production of the dock leveler according to the invention sees first an assembly of the metallic parts; accordingly the two straps are first connected to the metallic end parts or the two profiles 4, 5. First then the plastic is introduced by foaming or foaming within the space between the two belts. is limited, in such a way that the foaming material a firmly adhering connection Mt the metal parts when he comes into contact with them.

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Claims (14)

Expectations MJ dock leveler with a rigid plate made of a metallic top chord, a metallic lower belt and one or more shear-resistant manner to the straps arranged Zwischengliederηj characterized in that the intermediate members (14 '21) consist of a hard set foamy "or" porous or aeiligen plastic _p of firmly attached to the two straps. Are 2. Transfer bridge according to claim 1, characterized in that the _f side, located on the two surfaces of the plastic Brüelcenräsadern by a plate (top plate 15) covered " 3 »Dock leveler according to claim 1, characterized in that the two straps (1o, 11ja, b) connected to one another by the plastic are connected at their ends with profiles (4 ^ 5) running transversely to the bridge ₉ the M-efe for support the dock leveler on theirs. Ead © .a. .to serve,, _{4 β} Overload bridge according to claim 1 and J _5, characterized in that the surfaces of the plastic located at the bridge ends are in contact with the profiles (4, 5). 5. Dock leveler according to claim 1 - 4, characterized in that that the plastic in two or more, spaced from each other located, preferably parallel strips (21) is divided. 6 ο dock leveler according to claim 5, characterized $, that the strips (21) extend transversely to the bridge, and awar across its entire width "■ 7 ο leveler detoöii presented with one or more extending in Brüdcen.- "! Longitudinally 'Kastenträg @ ril ₉ that * &» © ■ are filled the Kastenrägar (23s24) = substance with the art (Figo 7) <> 8 ,, Üiierladelbrücke according to claim 1, characterized in » 10 9850/0680 -. . ... - 6 - that in the plastic one or more plates (22) are embedded, which run parallel to the straps (a, ti) and arranged at a mutual distance in the case of multiple arrangements are. 9. Dock leveler according to claim 1, characterized in that the cavities of the driveway wedges (19) with the Plastic are filled. 10. Dock leveler according to the "preceding claims" characterized in that the upper chord has a greater wall thickness than the lower chord. 11. Dock leveler according to the preceding claims, characterized in that the upper belt and the lower belt between the belt ends or almost over the entire length of the bridge, exclusively through the plastic are in communication when side cover plates (15) is disregarded. 12. Dock leveler according to claim 1q, characterized that the wall thickness of the upper chord (11) is about J to 6 mm and that of the lower chord. (1ο) "is about 1 to 3 mm. 13. Dock leveler according to claim 8, characterized in that that the plastic in the area of the outer bridge ends is free of the plates (22) and accordingly has these plates only in the bridge center area. 14. Process for the production of dock levellers according to the preceding claims, characterized in that the plastic is only then connected to the upper and lower belt will when these straps are firmly attached to the rest of the parts of the tftserjfcadebrtieke are connected. 109860 / 0680- Blank page