TECHNICAL FIELD

The present invention relates to ropes having a center bundle, a first layer which encircles said center bundle, a second layer which encircles said first layer, and a third layer which encircles said second layer.

PRIOR ART

Steel wire ropes, which are stressed at the highest degree, are important elements of transport machines like lifts. Different operation conditions obligated the production of various types of ropes. Since the load is distributed to pluralities of wires which exist in the rope, operational safety is substantially high. Wire ropes can be operated at high operation speeds, and there is a suitable proportion between their own weights and their carriage capacities and they have a big elastic extension amount. They can be easily controlled visually during operation. The carriage capacities of wire ropes and their operational characteristics do not change at low temperatures. The aim of calculating the wire rope is to select the rope which has the sufficient amount of operational lifetime. In the selection of the rope, fatigue resistance and abrasion resistance must be taken into consideration.

Wire ropes are made of thin steel wires which have high resistance. These steel wires are made of high carbon wire rods made of arc steel, Siemens-Martin steel or oxygen steel and with diameters changing between 5.50 and 16 mm. Wire rod is heated up to a temperature which is above the structure change point, and afterwards, wire rod is cooled in fluid sand beds or in lead bath at temperature of 450-500 C, and it is subjected to a thermal process named as isothermic patenting. The aim is to provide sorbitic or troostitic structure to the material for realizing wire drawing process in a firm manner. Bundles are formed by means of encircling thin wires, having diameters between 0.2 mm and 2.4 mm, around a core wire in one or more than one layers in a helical manner, and rope is formed by means of encircling the bundles around a core in a helical manner.

The wires of steel ropes, which are produced to be non-rotatable and resistant against rotation, are thin and sensitive and therefore, they must be used carefully. In general, they are produced in constructions of 18X7, 24X7, 31X7 and 35X7. Here, as the number of wires increases, the resilience and the resistances against rotation increase. However, as the number of wires increases, the costs also increase.

As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a rope, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

An object of the present invention is to provide a rope where the rotational resistance is increased and where the torque factor is reduced.

In order to realize the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a rope having a center bundle, a first layer which encircles said center bundle, a second layer which encircles said first layer, and a third layer which encircles said second layer. Accordingly, the improvement of the present invention is that the first layer and the second layer are encircled in the same encircling direction, and the third layer is encircled in a direction which is opposite to the encircling direction of the first layer and the second layer, the center bundle provided at the center is a first type of bundle which has a first diameter, the five bundles provided at the first layer are second type of bundle having a second diameter, five of the ten bundles provided at the second layer are the first type of bundle having the first diameter and the remaining five of them are third type of bundle having a third diameter, and the first type of bundles are sequenced in a manner staying between the third type of bundles, the eighteen bundles provided at the third layer are the first type of bundle having the first diameter.

In a possible embodiment of the present invention, the second diameter of the second type of bundle is greater than the first diameter of the first type of bundle.

In a possible embodiment of the present invention, the third diameter of the third type bundle is greater than the second diameter of the second type of bundle.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a representative cross-sectional view of the layers of the subject matter rope. Figure 2 is a representative cross-sectional view of the bundle types of the subject matter rope.

Figure 3 is one each representative cross-sectional views of the first type of rope, the second type of rope and the third type rope of the subject matter rope.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter rope (10) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

There is at least one center bundle (20) provided at the center of the subject matter rope (10).

There is a first layer (21) which encircles said center bundle (20), a second layer (22) which encircles said first layer (21), and a third layer (23) which encircles said second layer (22). The first layer (21) and the second layer (22) are encircled in the same encircling direction. The third layer (23) is encircled in a direction which is opposite to the encircling direction of the first layer (21) and the second layer (22). Thus, 50% increase is provided in the rotational resistance of the rope (10) with respect to the ropes (10) which are encircled in the same direction.

In the subject matter rope (10), the center bundle (20) is provided as a first type of bundle (31 ) which has a first diameter (D1 ).

There are five bundles at the first layer (21) which encircles the center bundle (20). The five bundles provided at the second layer (22) are provided as a second type of bundle (32) which has a second diameter (D2). In said embodiment, the second diameter (D2) of the second type of bundle (32) is provided in a greater manner than the first diameter (D1) of the first type of bundle (31).

There are ten bundles at the second layer (22) which encircles the first layer (21). Five of said ten bundles are provided as the first type of bundle (31) which has the first diameter (D1). The remaining five bundles are provided as a third type of bundle (33) which has a third diameter (D3). In accordance with said embodiment, in the second layer (22), one each third types of bundles (33) are provided at the two sides of each first type of bundle (31). In other words, the first type of bundles (31) and the third type of bundles (33) are arranged sequentially. Moreover, the third diameter (D3) of the third type of bundle (33) is provided in a greater manner than the first diameter (D1) of the first type of bundle (31). Besides, the third diameter (D3) of the third type of bundle (33) is provided in a greater manner than the second diameter (D2) of the second type of bundle (32).

There are eighteen bundles at the third layer (23) which encircles the second layer (22). Said eighteen bundles are provided as the first type of bundles (31) which have the first diameter (D1).

When the subject matter rope (10) and the ropes (10) which exist in the prior art and which have the same diameter are compared, since the first type of bundle (31), which has the smallest diameter, is used at the third layer (23) provided at the outermost part, the center of the third layer (23) is provided to be as far as possible from the center of the rope (10). Thus, the third layer (23) encircled in the opposite direction with respect to the other layers is far from the center and the rotational resistance is increased. Moreover, since the third layer (23) is made of first bundles which have diameters which are as small as possible, the diameter of the core, which is formed by the center bundle (20), the first layer (21) and the second layer (22), is provided to be as big as possible. Thanks to said embodiment, the torque factor, measured as 0.01 in the prior art is reduced to 0.005 in the subject matter rope (10). Thus, a rope (10) is obtained which has increased rotational resistance and increased strength.

On the other hand, production costs are reduced since only three types of bundles are used, since the first type of bundle (31), the second type of bundle (32) and the third type of bundle (31) are used in the production of the subject matter rope (10).

The protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention. REFERENCE NUMBERS

10 Rope

20 Center bundle 21 First layer

22 Second layer

23 Third layer

31 First type of bundle 32 Second type of bundle

33 Third type of bundle

D1 First diameter D2 Second diameter D3 Third diameter