DE2904416A1 - ARRANGEMENT TO INCREASE THE CAPACITY OF A CRANE - Google Patents

Description

2904418

Patent & lawyers Dipl.-lng. Curt Wallach

Dipl.-Ing. Günther Koch

• 3 Dipl.-Phys. Dr Tino Haibach

Dipl.-Ing. Rainer Feldkamp

D-8000 Munich 2 · Kaufingerstraße 8 · Telephone (0 89) 24 02 75 ■ Telex 5 29 513 wakai d

Date: February 6, 1979

Our reference: 16 459 - Fk / Ne

The Manitowoc Company * Inc.
Manitowoc, Wisconsin / USA

Arrangement to increase the load capacity of a crane

909833/0670

2304416

Patent Attorneys Di pi.-1 ng. Curt Wallach

Dipt.-Ing. Sünther Koch

^ Dipl.-Phys. Dr Tino Haibach

Dipl.-Ing. Rainer Feldkamp

D-8000 Munich 2 Kaufingerstraße 8 Telephone (0 89) 24 02 75 Telex 5 29 513 wakai d

Date: February 6, 1979

Our reference: 16 ^ 59 - Fk / Ne

The Manltowoc Company, Inc. Manitowoc, Wisconsin / USA

Arrangement to increase the load capacity of a crane

The invention relates to an arrangement for increasing the load-bearing capacity of a crane, in particular of heavy lifting cranes.

Modern heavy lifting cranes require a variety of constructive Compromise. Although, of course, high load-bearing capacity and lifting capacity are desired, required this increases crane size and weight, thereby affecting cost and maneuverability will. Because a crane rarely has to operate at or near its full capacity or capacity, results a certain degree of inefficiency a design rated for high performance but which operates well below that performance.

909833/0670

2S0441S

It would be extremely desirable to have a crane capable of handling the most frequent work to be carried out at a given point is designed constructively, but certain facilities to increase the load capacity ^ of the performance if an increased load capacity of this crane is required. Although this is not a sensible practice is, in many cases, attempts have been made in practice to achieve this goal through auxiliary measures, for example through simple attachment of an additional counterweight, such as a tractor, to the rear of the crane. Under Today's safety regulations is the addition of a Considerable counterweight in addition to that for which the crane is designed, is not permitted, because this results in the rearward tilting equilibrium would be changed. This means that when the crane is not under load, the additional Counterweight would act in the sense of tilting the crane backwards.

The invention is based on the object of an economical and simply constructed arrangement for increasing the load-bearing capacity of a crane in a safe manner without creating an undesirable rearward tilting force without affecting the normal operation of the crane in any other way.

This object is given by the specified in claim 1 Invention solved.

Advantageous refinements and developments of the invention result from the subclaims.

The arrangement according to the invention to increase the load capacity of the crane has a very simple and economical construction, without any backwards

909833/0670

23Q441S

directional tipping force, and without affecting the normal operation of the crane. Furthermore, by the invention Arrangement of the crane's center of gravity lowered so that when this crane is near its full capacity is operated, a tilting state occurring under load can be corrected more easily by the operator can.

The arrangement according to the invention for enlarging the crane can be made easy and simple by simple interlocking Added mounting tabs to the basic crane structure will.

The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing.

In the drawing show:

Figure 1 is a fragmentary perspective view

an embodiment of the crane;

FIg. 2 is an enlarged plan view of the lower one

Part of the crane according to Fig. Ij

Figure 3 is a fragmentary sectional view approximately

along the line 3-3 according to fig. 2;

4 is a fragmentary plan view of a

Part of the arrangement according to FIG. 35

FIg. 5 is a fragmentary view taken roughly along

the line 5-5 of Fig. 3

In the drawings, FIG. 1 shows one embodiment of one usual overhead crane 10 shown, <3 with one execution

909833/0670

shape of the arrangement is provided to increase the load-bearing capacity. The crane 10 has a chassis 11 which is supported by two crawler assemblies 12 and 13, an upper deck 14 being arranged on the chassis, which has a boom I5 and a crane frame or a luffing gear 16 and a normal counterweight VJ at the end of the deck 14 opposite to the boom 15 carries.

An additional counterweight element 21 is attached to the normal counterweight VJ so that it becomes part of this counterweight _{3 and} two auxiliary landing gear weights 22 and 23 of substantially box shape are attached at the front and rear ends of the landing gear so that they are weight-loaded extensions of the landing gear 11 form. In the illustrated embodiment, the counterweight 21 consists of a number of metal plates which are connected to one another and attached to the normal counterweight VJ (see Fig. 1). The auxiliary chassis weights 22 and 23 are preferably plates that are welded to form boxes and contain sand, concrete or metal waste as a weight.

To facilitate handling, the chassis weights 22, 23 are designed with pairs of arms 25 which carry fastening lugs 26 which fit together with fastening lugs ZJ which fit together on holding arms 28 welded to the chassis 11. Blocks 29 on the weights 22, 23 abut the ends of the landing gear 11 when the fastening tabs 26, 27 are in engagement with one another. The arms 25 are also drilled through to form openings 3I above the center of gravity, so that an auxiliary crane can be conveniently hung on the holes 3I of the counterweights 22, 23 so that these weights can be lowered into the fastening position in a simple manner. The holding arms 28 are formed with cam surfaces 32 so that the fastening tabs 26 are guided directly into engagement with the fastening tabs 27.

909833/0670

BATH ORIGINAL

To the chassis weights 22, 23 reliably in place to lock, the arms 25 and the holding arms 28 are with Bores formed which are aligned with each other when the chassis weights are in place and Locking bolts 33 are inserted into these holes, so that an unintentional separation of the chassis weights is prevented.

In the illustrated Aus'führungsform slippage preventing passage coverings 3 ^ ^a are uf the top of the chassis weights 22, 23 attached, and further is attached to the outer sides of the chassis weights a number of stages 35, so that access to the upper deck 14 is facilitated. Each of the chassis weights 22, 23 is preferably somewhat heavier than the additional counterweight 21. This ensures that the stabilizing effect of the chassis weights more than compensates for the additional tipping load resulting from the additional counterweight 21.

The effect of the arrangement described will appear from the foregoing be easily recognizable. The additional counterweight 21 becomes part of what is already there Counterbalance the crane, so that the lifting capacity of the crane is enlarged. The chassis weights 22 and 23 stabilize the crane and work in the range of maximum performance furthermore in the sense of an increase in the counterweight mass of the crane. Although not without further ado It can be seen that it should be noted that the chassis weights 22, 23 also have the effect of lowering the center of gravity of the entire crane so that the arc is increased which the center of gravity must traverse when the crane is overloaded is and begins to tip over. This enlarged arc means an increase in time in such a case, so that the Operator of the crane has more options to do this Recognize the state and correct it.

909833/0670

23044Ί6

It can also be seen that the increase in crane capacity or crane load-bearing capacity can be done at low cost is achieved and that in the main due to the arrangement of the chassis weights no disturbance of the im other normal operation of the crane occurs.

With the arrangement described, an additional load capacity can be added to a conventional crane by simply adding it by adding an additional counterweight to the normal counterweight while maintaining stability of additional auxiliary chassis weights on the front and rear end of the undercarriage between the crawler assemblies. Through the design of these chassis weights with arms and fastening tabs that cooperate with fastening tabs on the chassis these chassis weights can be lowered into place in a simple manner without disturbing the normal operation of the crane.

909833/067 0

BATH ORIGINAL

Claims (4)

Patent attorneys Dipl.-lng. Curt Wallach Dipl.-Ing. Günther Koch Dipl.-Phys. Dr Tino Haibach Dipl.-Ing. Rainer Feldkamp D-8000 Munich 2 · Kaufingerstraße 8 · Telephone (0 89) 24 02 75 ■ Telex 5 29 513 wakai d Date: February 6, 1979 Our reference: χ 5 patent claims: 1. Arrangement to increase the load capacity of a crane with a running gear, which is supported by two crawler arrangements and having an upper deck mounted on the landing gear for attachment of a boom at one end and a normal counterweight at the other end, characterized in that an additional counterweight element (21) is attached to the normal counterweight (I7) and forms part of this counterweight and that two auxiliary landing gear weights (22, 23) with a substantially box-shaped shape on the front and rear end of the chassis (11) between the ends of the track assemblies (12, 13) are attached and weight-loaded Form extensions of the chassis (11). 2. Arrangement according to claim 1, characterized in that that each of the landing gear (22, 23) a has greater weight than the additional counterweight element (21). 3. Arrangement according to claim 1 or 2, characterized in that treads (3 ² O and a number of steps (35) are attached to the undercarriage walls (22, 23) and allow easy access to the upper deck. 909833/0670 2304416 4. Arrangement according to one of the preceding claims, characterized marked rejects that the chassis weights (22, 23) are designed with two fastening arms (25), wear the fastening tabs (26) that match the fastening tabs (27) that are attached to the chassis (H) attached holding arms (28) are attached so that the Fahrwerkgewicbte (22, 2J) lowered and in the fastening position can be left behind and that the arms (25) and the holding arms (28) have mutually aligned openings for receiving locking bolts (33), when the fastening tabs are in engagement with each other, 5. Arrangement according to claim 4, characterized in that that the retaining arms (28) with cam surfaces (32) for guiding the fastening tabs into the fitting position are provided. 909833/0670 BATH ORIGINAL