DE29623655U1 - Connection terminal made of metal for wire ropes - Google Patents

Description

PATENT ATTORNEYS Reference number:

DiPLiNG CONRAD KÖCHLING

DiPLiNG CONRAD-JOACHIM KÖCHLING ^ ¹ " ^:

Hubert Waltermann

PO Box 20 69 - D-58020 Hagen _. _c , .. ,

Fieyer straße 135 - D-58097 Hagen Ironware factory and

g|/81164.85033 Gesenkschmiede GmbH & Co,

Telegrams: Patent Cook Hagen RÖtloh 4

Accounts: Commerzbank AG, Hagen 3 515 095 (bank code 450 400 42)

Sparkasse Hagen 100 012 043 (bank code 450 500 01)

Postbank: Dortmund 5989 - 460 (bank code 440 100 46) D~58802Bal Ve

VNR: 11 58 51

Serial No. 12987/98 CJK/G.

from 23.11.98

Metal connecting terminal for wire ropes

The invention relates to connecting terminals provided with a socket part, in particular threaded terminals made of stainless steel, which are connected to the end of a wire rope, wherein the socket part has a blind hole, the inner diameter of which is matched to the outer diameter of the wire rope, wherein the end of the wire rope is inserted into the socket part and the socket part is subsequently pressed onto the wire rope while reducing the diameter of the socket part.

Connection terminals to which wire ropes are connected

are increasingly used for guying systems for facade greening, for balcony or stair railings or for other construction purposes. Such terminals are also used in sailing to guy ropes, with the help of shroud tensioners.

In order to be able to firmly connect the connecting terminals to the wire ropes, bushing parts are formed on them, into which the end of a wire rope can be inserted. The bushing part is then pressed with the inserted wire rope, for example in a roller tool or a rolling tool, so that the bushing diameter is reduced overall and a firm press connection is created between the bushing material and the wire rope.

Until now, it has been common practice to produce certain connection terminals that have sockets for wire ropes and can be pressed onto the wire rope ends. For this purpose, wire ropes are manufactured in fixed dimensions, i.e. in dimensions of 3 mm diameter, 4 mm diameter, 5 mm diameter, 6 mm diameter, etc. It is also common practice to provide the connection terminals with threaded bolts,

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However, other elements can also be used instead of the threaded bolt, such as a connecting fork or a stop collar. If threaded bolts are formed on the terminal, they generally have standardized dimensions so that they can be screwed on with standard nuts. For this reason, threaded bolts of dimensions such as M4 (4 mm diameter), M5 (5 mm diameter), M6 (6 mm diameter), M8 (8 mm diameter), MIO (10 mm diameter) etc. are used. The special feature of the application is that the connecting terminals are manufactured by certain manufacturers, who are not at the same time the assemblers who connect the wire ropes to the connecting terminals, but the manufacturer of the terminals supplies these elements to the corresponding assemblers who manufacture or buy the wire ropes. The assembler then connects the wire ropes to the corresponding connecting terminals. The assemblers have tools for this that are geared to the usual and common dimensions. The manufacturers therefore have pressing tools by means of which the corresponding ropes with the corresponding

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Bushings can be connected. The bushing parts that have been used up to now have such an inner bushing dimension that a corresponding wire rope, for example a 3 mm thick wire rope, can be threaded into the bushing. In this example, the bushing outer diameter is usually 6.5 mm before the reduction and 5.5 mm after the reduction.

The usual assignment of socket parts with threaded bolts on the one hand and wire ropes on the other hand has been done in practice for 50 years in such a way that the thread diameter of the threaded bolt should correspond to approximately twice the diameter of the wire rope. As a result, an assignment is made in such a way that, for example, a wire rope with a diameter of 3 mm is assigned a socket part with an M6 threaded bolt, a wire rope with a diameter of 4 mm is assigned a socket part with an M8 threaded bolt, a wire rope with a diameter of 5 mm is assigned a socket part with an MIO threaded bolt, etc.

The bushing part into which the corresponding wire rope end is to be inserted is adapted in diameter to the wire rope diameter, so that the wire rope can be inserted with little play and then

can be pressed in by reducing the diameter of the bushing part. For a 3 mm thick wire rope, the bushing part has an outside diameter of 6.5 mm before pressing and 5.5 mm after the diameter reduction. For a 4 mm wire rope, the bushing part has an original outside diameter of 7.5 mm and an outside diameter of 6.5 mm after deformation, while for a 5 mm wire rope, the bushing part has an outside diameter of 9 mm before and 7.8 mm after the pressing process.

From this previously usual assignment it is clear that the bushing part is considerably thicker in diameter than the wire rope connected to it, which is considered a disadvantage for assembly reasons and for optical reasons.

Based on this state of the art, the invention is based on the object of creating a connection terminal of the generic type with which, using the same production tools, in particular the same rolling tools, and using the same bushing parts, a large approximation of the outside diameter of the bushing to the rope diameter

can be achieved, whereby the connection point must also withstand high pull-out forces.

To solve this problem, the invention proposes that the inner diameter of the socket part is dimensioned before pressing so that it corresponds to the outer diameter of the wire rope to be inserted plus 0.3 mm ± 0.3 mm tolerance, that the outer diameter of the socket part is dimensioned before pressing with a tolerance of 2.5 mm + 0.3 mm for wire rope diameters of up to 5 mm and with a tolerance of 3.0 mm ± 0.3 mm for wire rope diameters greater than 5 mm, and that after pressing by rolling, an outer diameter of the socket part is established which is larger than the rope diameter by 1.5 mm ± 0.3 mm tolerance for rope diameters of up to 5 mm and by 1.8 mm + 0.3 mm tolerance for rope diameters of more than 5 mm.

The invention makes use of the fact that existing tools can continue to be used. According to the invention, however, the manufacturer no longer uses a bushing part with an outer bushing diameter of 7.5 mm before the reduction for a 4 mm wire rope, but with a bushing part of 6.5 mm

before the reduction, which was previously used for 3 mm thick wire ropes. The manufacturer can therefore continue to use the existing tools. A fundamental problem with the dimensioning of the corresponding bushings is that the connection point between the bushing and the wire rope should be designed in such a way that the minimum breaking strength of the wire rope is achieved in tear tests. With the design according to the invention, it has been surprisingly found that higher breaking loads are achieved despite the use of smaller connection bushings on the corresponding wire ropes. In practice, it has been shown that the connection created between the bushing and the wire rope has a tensile load of over 100% of the rope breaking load, i.e. has a greater tensile strength than the wire rope itself.

This consequence must be surprising, since the invention uses less material. This is evidently due to the fact that, as a result of the smaller diameter of the connection socket compared to the state of the art, the inevitable consequence is that the wall thickness of the socket part is also reduced. This in turn means that when the diameter is reduced,

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of the bushing part when pressed in the corresponding rolling tool, the bushing material can flow better into the unevenness of the cable windings. This has the consequence that despite smaller dimensions and lower wall thickness of the bushing part, higher pull-out forces can be built up than in the state of the art. This design also means that the bushing part can be shortened in terms of its length, as stated in claim 3.

The invention also ensures that in connection terminals with threaded bolts according to claim there is virtually only one step distance from rope diameter to thread diameter, i.e. with a rope diameter of 3 mm an M4 thread of the threaded bolt, with a rope thickness of 4 mm an M5 threaded bolt, with a rope thickness of 5 mm an M6 threaded bolt, with a rope thickness of 6 mm an M8 threaded bolt, with a rope thickness of 7 mm an MIO threaded bolt, etc. can be used. As a result, all the following connection parts and installation parts such as shroud tensioners or the like, which are connected to the threaded bolt, can be made smaller, i.e. the smaller

Dimensions of the threaded bolt must be adapted - with a relatively large rope diameter. Compared to the conventional designs, the hole for inserting the wire rope end of the smaller threaded terminal on the next larger rope diameter has been enlarged, whereby the outer diameter is the same as for the standard threaded terminals, but a different assignment to correspondingly larger dimensioned wire ropes is made. Conventional tools can be used for pressing, so that the previously usual rolling or pressing tools can be used with the new system.

The transition from the threaded bolt to the crimpable socket part of the terminal is adapted to the outer diameter of the socket part after the rolling process, so that no bead or similar radially protruding areas are formed at the transition from the socket part to the threaded bolt. This means that the outer diameter of the entire threaded terminal is only slightly larger than the wire rope diameter. In this way, installation can be simplified and the aesthetic impression can be significantly improved.

The invention is explained below using an embodiment.

It shows:

Figure 1 shows a connecting terminal with threaded connection in side view, partially sectioned;

Figure 2 a connection terminal with fork connection

Figure 3 shows a connection terminal with countersunk head in elevation;

Figure 4 shows an embodiment of a

Connection terminals in side view.

Figure 4 shows a connection terminal 1 with the inserted end of a wire rope 2. The connection terminal 1 is made of stainless steel and has a socket part 6, from the closed end of which a threaded bolt 3 protrudes. The end of the wire rope 2 is inserted into the opening of the socket part 6 facing away from the threaded bolt 3.

Figure 4 shows the state before the bushing part is pressed or rolled. In order to achieve a firm connection between the inserted end of the wire rope 2 and the bushing part 6, the bushing part is then subjected to a rolling or pressing process so that the bushing part 6 is reduced in diameter and a firm connection to the inserted end of the wire rope 2 is thus created. The dimensions of the rope 2 and the threaded terminal 1 are given in the attached table (Fig. 4) for some embodiments. The diameter dl is the thread diameter of the threaded bolt 3, the diameter d2 is the outside diameter of the bushing part 6 before the diameter reduction (pressing or rolling). d3 is the inner diameter of the socket part 6. d5 is the reference diameter of the transition area 5 between the threaded bolt 3 and the socket part 6. Ll is the total length of the connection terminal 1. L2 is the length of the socket part 6 (= the insertion depth of the wire rope end). L3 is the length of the threaded bolt 3. L5 is the length of the transition area between the threaded bolt 3 and the socket part 6.

The attached table shows dimensions for ropes from 3 to 6 mm in 1 mm increments and for threaded bolt dimensions from M4 to M8. It can be seen that instead of the conventional allocation (2 mm rope / M4 threaded bolt; 3 mm rope / M6 threaded bolt; 4 mm rope / M8 threaded bolt), a difference between the dimensions of the rope and threaded bolt reduced by 2 dimensional steps is achieved, as is the case for the insertion length of the wire rope end.

Each of the terminals shown in Figures 1 to 3 has a connection terminal 1, which consists of a cylindrical sleeve-like connection part made of stainless steel, which has a blind hole.

The end of the stainless steel wire rope 2 can be inserted into this blind hole and, when inserted, can be pressed together with the connecting part 1. In the embodiment according to Figure 1, a threaded bolt 3 is formed on the end facing away from the rope connection, in the embodiment according to Figure 2 a connecting fork 4 is formed, and in the embodiment according to Figure 3 a countersunk head is formed.

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In all versions, the length of the blind hole 5 is equal to 6 times the diameter of the rope 2.

Claims (3)

*"-f4- Protection claims : l.Connection terminals provided with a socket part, in particular threaded terminals made of stainless steel, which are connected to the end of a wire rope, wherein the socket part has a blind hole, the inner diameter of which is matched to the outer diameter of the wire rope, wherein the end of the wire rope is inserted into the socket part and subsequently the socket part is pressed with the wire rope while reducing the diameter of the socket part, characterized in that the inner diameter of the socket part is dimensioned before pressing so that it corresponds to the outer diameter of the wire rope to be inserted plus 0.3 mm ± 0.3 mm tolerance, that the outer diameter of the socket part is dimensioned before pressing with a tolerance of 2.5 mm + 0.3 mm for wire rope diameters of up to 5 mm and with a tolerance of 3.0 mm + 0.3 mm for wire rope diameters greater than 5 mm, and that after pressing by rolling an outer diameter of the socket part is established which with rope diameters of up to 5 mm by 1.5 mm ± 0.3 mm tolerance and for rope diameters of more than 5 mm is 1.8 mm ± 0.3 mm tolerance larger than the rope diameter. 2.Connection terminal according to claim 1, characterized in that the connection terminal has a threaded bolt projecting coaxially from the socket part, the outer diameter of which corresponds to the socket outer diameter after pressing. 3.Connection terminal according to claim 1 or 2, characterized in that the length of the blind hole of the socket part is dimensioned such that it corresponds approximately to 5 to 7 times, preferably 6 times, the rope diameter of the wire rope to be connected.