DE7015460U - TELESCOPIC BOOM. - Google Patents

Description

concerning
Telescopic boom

The hiring refers to. a telescopic boom, especially for telescopic cranes, with ^ !. 2V?: a on the Basic level attached lifting cylinders and at least two other telescopes.

To extend a known telescopic boom of this type, a lifting cylinder with a very long Piston rod or a lifting cylinder provided with several telescopic steps is required, the cylinder. en the basic level and the end of its piston rod or a.u. last telescopic stage of the lifting cylinder at the last * »* · Attacks telescopic stage of the telescopic boom.

The lifting cylinder of the known telescopic boom is very long and is therefore in the extended state exposed to increased risk of buckling.

The hiring is based on the task of a telescopic boom To create the type mentioned, in which a hydraulic cylinder of normal design with low Buckling length can be used in the extended state.

1 · «I.

To solve this problem it is provided that the ends of a chain are attached to the basic stage, which by sn ft & tn ί => τ ·? * · £ ί »η ΦρΙρβΙγλτι fl-reViVim ·· orolacfor + o Γο ++ ο« τιοΛβί Tim -

is steered, and that the second telescope is connected to the chain via a fastening point connected to it is.

With a telescopic boom designed in this way, the lifting cylinder engages the first telescope. The pushing out the further telescope is brought about by means of the chain. A path transmission is achieved by means of the chain, due to which the further telescope is moved by twice the path of the first telescope. That way it becomes second telescope just pushed out of the first telescope by the same stroke as the first telescope is pushed out of the basic level.

The buckling length of the extended lifting cylinder is the greater because of its comparatively small stroke Part of the total boom stroke is applied via the chain and the bending stress is low.

If the telescopic boom has more than 3 steps, the arrangement according to the innovation can be repeated by attaching the ends of a second chain to the second telescope are deflected around chain wheels arranged on the third telescope and attached to the fourth telescope is. This arrangement can be repeated as required depending on the number of telescopes.

Regardless of the number and length of the telescopes, the same short length of the lifting cylinder can always be used cheaper, d. H. low buckling length can be maintained.

1 t

According to a further development of the innovation, it is provided., that the ends of the chain are attached near the free end of the basic stage, that each a sprocket is attached to each end of the first telescope and that the attachment point to connect the chain to the second telescope is located near its free end,

The buckling length of the lifting cylinder in the extended state can be further shortened in that the piston rod of the lifting cylinder on the basic stage and the cylinder housing protruding into the telescope the end of the first relesk ^ "towards the elementary level is attached. The lifting cylinder is installed in reverse as usual. The buckling length when extended in this case essentially only corresponds to the length of the extended part of the piston rod while with the usual installation of the lifting cylinder it is about its total length including the extended piston rod is equivalent to. In addition, the length of the basic level is also reduced; that with the usual Arrangement, the articulation end of the telescopic boom, extended lifting cylinder end now protrudes into the telescope into it.

The innovation as well as advantageous details of the innovation are shown in the following on the basis of a schematic drawing? two embodiments explained in more detail.

Show it

Figure 1 shows a telescopic boom according to the invention in longitudinal section and

FIG. 2 in a longitudinal section according to FIG. 1 of a telescopic boom according to the invention with an inverted arrangement Lifting cylinder.

The telescopic boom of a telescopic crane according to Pigur 1 -includes 3 levels, namely a basic level 1, an intermediate level in the form of a first telescope 2, and a final stage in the form of a second telescope 3, which carries the load rope receiving rollers 4 at its end. At that end of the basic stage 1 at which it is mounted on the turntable of a crane or the like, the cylinder housing 5 of a double-acting lifting cylinder designated overall by 6 is articulated. The piston rod 7 of the lifting cylinder is articulated to the end of the first telescope 2 facing the basic stage 1. This telescope 2, which is longitudinally guided in the basic stage, carries a rotatably mounted chain roller 8 and 9 at each of its ends, around which a chain 10 runs. The chain 10 is attached with its ends at 11 near the free end of the basic level w.

At the inner end of the second telescope 3 ist.ein attachment point 12 is provided on which the chain 10 with its strand 13 opposite the fastening point 11 is attached.

If the piston rod 7 of the double-acting cylinder 6 is extended, the first telescope 2 becomes the basic level 1 pushed out. However, the sprockets 8 and 9 are also moved by the same stroke. Trum 13 and with it the attachment point 12 and the second telescope 3 firmly connected therewith are of the chain 10 by one opposite dsm stroke of the first telescope doubled way extended.

The telescopic boom according to Figure 2 is basically constructed in the same way as that according to FIG. 1. The same parts are provided with the same reference numerals. This telescopic boom differs from that according to FIG. 1 by the reversed arrangement of the double-acting lifting cylinder 6 'and the resulting shorter length of the basic stage 1'. The cylinder ^{housing 5 1 of} the lifting cylinder 6 * is connected at 15 to the end of the first telescope 2 facing the basic stage 1 *. As a result, the buckling length in this embodiment is limited to the distance between the attachment point 15 and the articulation point 16 of the piston rod on the basic stage, while in the embodiment according to ? 5ur 1 is the entire length of the lifting cylinder between the articulation point of the cylinder housing on the basic stage 1 and the articulation point of the piston rod on the first telescope 2.

Ι / ΧΣΙΙ

7015450 -w. Η

Claims (3)

Protection claims 1. Telescopic boom, especially for telescopic cranes, with a lifting cylinder articulated to the basic stage, and at least two further "scopes, characterized in that the ends of a chain (lo) are attached ^{to the basic stage (1; I 1) (at 11},} which order, and gas DTSS second telescope (3) connected via a switched into the cable attachment point (12) with this is on the first telescopic rotatably mounted sprockets (2) (8, 9) is deflected. 2. Telescopic boom according to claim 1, characterized in that the ends of the chain (loj near the fveien end of the basic stage (1, I ¹ ) are attached, that in each case a sprocket (8, 9) at each end of the first telescope (2) is attached and that the attachment point (12) for connecting the chain to the second telescope (3) is located near its free end. 3. Telescopic boom according to one of claims 1 or 2, characterized in that the piston rod (7 ¹ ) of the lifting cylinder (6 ¹ ) on the basic level (I ^{1 ) and the cylinder housing (5 1} ) protruding into the telescopes (2, 3) of the lifting cylinder is attached to the end of the first telescope (2) facing the basic level. IVI