DE8127847U1 - Reinforced telescopic boom - Google Patents

Description

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-JLJL-ür ~ t f% η m e ldun

P - 196

2i.09.i98l

Grs / Po

of the company

Albert Böcker GmbH & 6o KG

Mechanical engineering, 4712 Werne

Reinforced telescopic boom

The invention relates to telescopic booms, in particular as an extendable rail for load buckets which can be moved on rollers or the like, in which between telescopic shots., at least one that prevents the relative movement in the retraction direction, preferably insertable in any desired extension position, Lock is provided.

With telescopic booms it is occasionally necessary to provide bar elements between two telescopic sections in order to limit the extension to build. In a proposal that is not yet part of the state of the art (patent application 'P 30 01 410.9) it has already been proposed to provide interlocks between the first to the penultimate telescopic section. These are designed in such a way that that the extension length can be chosen practically arbitrarily. Some sort of locking mechanism for the telescopic shots one another is an indispensable prerequisite for the invention described below.

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Telescopic booms are often used as inclined lifts and are used, for example, by roofers, construction companies and the like. For example, loads such as bricks, cement or the like are to be brought to a higher level, the telescopic boom being extended so far that its end can be placed on any fixed point. Until this upper support point is reached, the telescopic boom is practically a one-sided e :. tensioned beam that also bends accordingly. The concave side of the support therefore faces the floor. However, as soon as the free end rests on a plague point, the situation is reversed, and a support is created that is placed on two supports, so that the convex side now faces the ground. This is the state in which the load bucket is to be raised with possibly considerable loads on the rails formed by the telescopic boom. The smaller the angle between the floor and the telescopic boom, the greater the bending load. However, since this must be designed for the highest conceivable load, it was previously necessary to use unusually powerful and therefore expensive constructions, especially in the case of inclined elevators. In the case of inclined elevators, the extension length can easily be ¼ meters. The deflection is therefore considerable and increases under the load, especially when it is approximately in the middle between the support points. If the extension length is then to be corrected if necessary, the cladding created by the load between the telescopic sections is already so strong that movement is no longer possible.

The invention aims to avoid the prescribed disadvantages and also with a greater extension length with smaller dimensions and using less material to achieve a carrier that is as stretched as possible and therefore not bent too much.

The invention solves the problem in that one or more ropes several telescopic sections of the telescopic

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Bridge the cantilever guided over spacers and form one or more stiffening belts when tensioned.

The rope tension can initially be brought about in any way, the only requirement is that the telescopic shots are interlocked in the retraction direction.

The spacers over which the ropes are guided are each arranged at the ends of the telescopic sections. The spacers can, for example, be fastened in an articulated manner and can be folded down and can be designed in the manner of a bracket.

| / ~ The invention has now made it its task to to avoid the use of additional means to generate the rope tension. She therefore suggests that the unilateral attached ropes run onto a pre-tensioned winding roll or the like, which forms a rope store, so that with the rope or ropes always slightly pre-tensioned, a rope bridge is created automatically when the telescopic boom is extended arises, which, however, does not yet have a stiffening effect. If the lock is now switched on, the telescopic. Shots no longer move relatively in the retraction direction. '' Through the formation of a cantilevered free beam, the telescopic boom bends downwards so that the rope assumes its shortest position. Is now after a Another feature of the invention via holding devices that can be switched off and on, the rope or ropes before entering the winding roll fixed, the ropes can no longer be extended. Now becomes the outer end of the telescopic boom on a plague point when placed, the rope forms the tendon of a bowling alley. The telescopic boom remains slightly bent down and forms an ideal bridge for the load to be transported on it.

Advantageously, the penultimate shot and the first shot are bridged by the ropes, which then form a belt upstream \ _a preferably a bottom chord. The principle according to the invention is of course also suitable for the formation of an upper belt or side belts, depending on which use

types are available. The rope winding device can now be used by any means, for example pneumatically, electrically, a standstill motor, hydraulic drives or peder drives provide a pretension in the winding direction. It is preferably arranged on the first telescopic section. An actuator, which is provided in the area of the control station, enables the rope to be operated holding device.

With the invention, it is now possible to use a higher load with less construction effort To transport inclined elevator without the individual shots being stressed too much in their overlaps, jamming or material deformations occur and similar disadvantages.

The drawing shows with

Pig. 1 is a side view of a telescopic boom according to the invention in the extended and end-supported position,

Fig. 2 shows a cross section through the telescopic boom Pig. I in an enlarged view,

Fig. 3 the telescopic boom as a carrier clamped on one side.

A telescopic boom 1, which may belong to an inclined elevator, forms rails 2 for the movability of a load bucket 3. The telescopic sections 4 are fixed in their selected extended position by locking elements. One or more ropes 6 are guided over spacers 7 and form a stiffening belt 8. The spacers 7 are each attached to the ends 9 of the telescopic sections 4 and, when retracted, form a tightly packed package. The rope or ropes 6 are fixed to stops 10 at the outer end of the penultimate telescopic section. They run over corresponding guides of the spacers over a cable holding device 14, guides 13 to the pretensioned winding roller 11, which forms a cable storage device 12. The pretension can be generated in any desired way hydraulically, pneumatically, electrically or by a spring mechanism in the winding direction in order to ensure constant rope tension. When the telescopic sections are extended, the spacers 7 move away from one another and slide over the rope, which is continuously lengthened by being unwound from the winding roller 11. Once the required extended position has been reached, a cable holding device 14 is switched on, which can be designed as a reverse brake, a cleat or the like in a known manner. The ropes 6 now run from the stop 10 ν below the telescopic boom 1 to the rope holding device I ¹ I am

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on the first telescopic section ΐβ, so that this with all telescopic sections a carrier 18 stiffened by lower chord 17 forms up to the penultimate telescopic section. As the carrier is clamped on one side, it bends like a held free rod, depending on the inclination, so that the rope or ropes 6 form a kind of Plitz bow tendon. If the rope holding device 14 is now switched on, it can become bent Do not change position significantly. Now lies the outer end of the telescopic boom with its upper support parts on fixed points, a support is formed on both sides, which now wants to bend downwards. He wants this especially when a heavy load bucket 3 is being transported on him. This bending forces now tension the rope or ropes 6 without the need for separate tensioning devices.

Of course, the rope tension can also be increased in that the rope holding devices 14 shortly before reaching the Bolt position are already switched on, so that a rope tension through the last stroke of the relative displacement of the parts to each other, so by the last extension of the telescopic boom 4 receives a corresponding voltage.

The invention can also be used by a few additional measures to forcibly retract the telescopic sections, in which the winding roll receives an additional drive acting in the winding direction, with which, for example, the sections of the telescopic boom can also be moved relative to each other in the retraction direction when the weight component can no longer be used for this purpose. The pretension, which is provided in the winding direction anyway, can also be selected so that the rope or ropes 6 are retracted below. _{Support N.}

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Claims (7)

• •• ■ OB · * * «* *" 09/21/1981 Grs / Po -e - if η s ρ r (Ii c h e., " 1. Telescopic boom, in particular as an extendable rail for rollable load buckets or the like, in which between telescopic sections at least one preventing the relative movement in the retraction direction, preferably, 'in, selectable ^ ar ^ pn any extension positions insertable, TerriegelWg ·. (5) is provided thereby characterized in that one or more ropes (6) several telescopic sections (4) guided over spacers, bridge and tensioned one or more stiffening straps (8) form. 2. Telescopic boom according to claim 1, characterized (· "i '" v ^l ' ■ '* marked, .jdaßdie spacers (7) each at the ends (J)) of the telescopic sections (4) are attached. · .. · "''" 3. Telescopic boom according to claim 1 or 2, characterized characterized in that the spacers (7) are hinged and can be folded down. 4. Telescopic boom according to one or more of claims 1 to 3, characterized in that that the ropes (6) run on a pretensioned winding roll (11) or the like and a rope storage (12) form and are attached on one side to a stop (10). 5. Telescopic boom according to one or more of claims 1 to 4, characterized in that that that or the ropes (6) before their inlet (13) on the Winding roller (11) via cable holder devices (14) that can be switched on and off, such as cleats, reverse brakes or run like that. 3 3 -2- ί 6. Telescopic boom according to one or more of the claims j I to 5 »characterized by ) that the penultimate (15) and the first (16) telescopic shot I and the telescopic sections between these ( ¹ I) I are bridged by a rope belt. I. 7. Telescopic boom according to one or more of claims a ^: 1 to 6, characterized in that ζ _v that the rope or ropes (6) form a lower chord of a girder (18) placed on both ends (support parts above 19 and below 20). S. Telescopic boom according to one or more of Claims 1 to 7 »characterized in that the cable holding device (I ¹ I) is arranged on the first telescopic section (16) and can be operated from the control station via an operating member. Ι 9 · Telescopic boom according to one or more of the claims 1 to 8, characterized in that the winding roll (11) or cable storage (12) has a Tension drive received, which serves as a drive-in aid. • t t ι ■ • lit ·