CN-116056947-B - Tensioning device

Abstract

The invention relates to a tensioning device for tensioning a chain, a belt, a rope or a similar tensioning member (1), comprising at least one tubular tensioning nut (2) and at least one bolt (3) which is countersunk into the tensioning nut (2) and interacts with the tensioning nut, wherein the bolt (3) is equipped with at least one end-side screw-out safety (9; 10a, 10b, 11), and wherein the bolt (3) is equipped with an unthreaded region (9) on the end side and a stop (10 a, 10b, 11) connected thereto as the screw-out safety (9; 10a, 10b, 11).

Inventors

• U. Shebel

Assignees

• 西德钢丝绳销售多利茨有限责任两合公司

Dates

Publication Date

20260505

Application Date

20210823

Priority Date

20200910

Claims (13)

1. 1. A tensioning device for tensioning a tensioning element (1), comprising at least one tubular tensioning nut (2) and at least one bolt (3) which is countersunk into the tensioning nut (2) and interacts with the tensioning nut, wherein the bolt (3) is equipped with at least one end-side unscrewing safety, characterized in that the bolt (3) is equipped with an unthreaded region (9) on the end side and a stop connected thereto as unscrewing safety, and in that the stop is constructed in two parts with a fixed stop (10 a) and a movable stop (10 b) and a spring (11) arranged between the fixed stop and the movable stop.
2. 2. A tensioning device as claimed in claim 1, characterized in that the unthreaded area (9) has an axial length (a) which is substantially equal to the thread length of the thread line (4) of the receiving bolt (3) in the interior of the tensioning nut (2).
3. 3. Tensioner according to claim 1 or 2, characterized in that the unthreaded area (9) is configured as a relief groove introduced into the thread (5) of the bolt (3).
4. 4. A tensioning device as claimed in claim 1 or 2, characterized in that the stop is configured as an annular stop.
5. 5. Tensioner according to claim 1 or 2, characterized in that the spring (11) is made of an elastomer.
6. 6. Tensioner according to claim 1 or 2, characterized in that the spring (11) is configured as a spring ring.
7. 7. Tensioner according to claim 1 or 2, characterized in that the fixed stop (10 a) is configured as a fixed stop ring and the movable stop (10 b) is configured as a movable stop ring.
8. 8. A tensioner according to claim 7, characterised in that the fixed stop ring is connected with a bolt (3).
9. 9. A tensioning device according to claim 7, characterized in that the movable stop ring is axially movably supported on the bolt (3).
10. 10. A tensioner according to claim 7, characterised in that the fixed and movable stop rings are accommodated in recesses (15) of the bolt (3).
11. 11. Tensioner according to claim 7, characterised in that the fixed and movable stop rings are provided with safety rings (13, 14), respectively.
12. 12. The tensioner as in claim 7, wherein the fixed stop ring and the movable stop ring are configured in an L-shape in cross section.
13. 13. A tensioning device according to claim 1, characterized in that the tensioning member (1) is a chain, a belt or a rope.

Description

Tensioning device Technical Field The invention relates to a tensioning device for tensioning a chain, a belt, a rope or similar tensioning means, comprising at least one tubular tensioning nut and at least one bolt which is immersed in the tensioning nut and interacts with the tensioning nut, wherein the bolt is equipped with at least one end-side screw-out safety. Background Such tensioning devices are often used in the field of lifting and transport technology, i.e. in general logistics. The tension members tensioned in this manner are not limited to chains, belts, ropes, and the like. By means of the tensioning element, the load can be locked, for example, to the transport surface of the transport means. As conceivable transportation means, LKW semitrailers, trailers, train trailers, etc., but loading platforms for ships, containers, etc. are also used. Due to the described application areas, it is often necessary to apply a high tensioning force to the tensioning member by means of a tensioning device. For this purpose, the tensioning nut is generally equipped with a ratchet mechanism, as is described in detail in DE202020103769U1 of the present inventor. Furthermore, the tensioning device can be connected to the tensioning member on one side and engage with a movable end on the bolt into an eyelet on the loading surface or on another fastening point. However, it is also possible for the tensioning device to be connected to the tensioning member on both sides for providing the necessary lashing force, for example for locking the load on the transport surface. For example, a tensioning device of the type described at the outset is described in US4130269 of this type. In this case, two bolts are realized which are countersunk into the central and tubular tensioning nut on both sides. The two bolts have screws which are screwed in on the end face and which are guided toward the stop when the maximum screw-out length is reached. Thereby providing the desired unscrewing safety. However, in this type of tensioning device, there is a problem in that the screw is sheared or damaged when a large tensioning force is applied. Thus, unscrewing the safety device cannot (re) perform its intended function. Furthermore, the tensioning device is often damaged irreparably or requires costly maintenance. In practice, this phenomenon is increasingly observed, since on the one hand the applied tensioning force increases and on the other hand the tensioning stroke becomes greater. This is due in particular to the fact that not only the steel chain with forged chain elements is tensioned by means of the described tensioning device, but also more and more so-called textile chains are equipped with the required binding forces. Such a fabric chain is described, for example, in DE202018105723U1 of the present inventors. The fabric chain is distinguished by a light weight and at the same time a high strength, but is subject to significant twisting before the required tensioning forces can be applied. As a result, a large tensioning length for the bolt is required, which (as a result of) the associated bolt driving out of the safety device. The tensioning device according to WO2018/073098A1 of the same kind faces similar problems. In practice, an end stop is provided here at the end of the screw. The present invention relates to a locking ring or end cap plate. Due to the disk-shaped or ring-shaped character of the end stop, a better force introduction is observed, although compared to the screw according to US 4130269. However, in this case, damage may also occur. Furthermore, the prior art to date does not give the operator feedback to the end stop in order to prevent such damage. Here, the present invention as a whole intends to give remedial measures. Disclosure of Invention The problem addressed by the present invention is to develop a tensioning device of this type for tensioning chains, belts, ropes etc. in such a way that damage is avoided as much as possible and the operator is informed of the arrival at the end stop. In order to solve this problem, a tensioning device of this type within the scope of the invention is characterized in that the screw is equipped on the end side with an unthreaded area and a stop connected to the unthreaded area as a unscrewing safety. Thus, the present invention still and unchanged works with a stopper, however, the stopper is combined with the unthreaded area. The unthreaded area is distinguished by the fact that the threads provided around the circumference of the screw are interrupted or removed in this area. Thus, the bolt cannot transmit forces in the unthreaded area. In detail, the tensioning nut has at least one thread in its interior, into which the screw thread of the screw is countersunk. Now, if the bolt reaches the thread in the interior of the tensioning nut with its unthreaded area, the threaded bolt cannot be screwed out further. For this purpose, the typical design adopted