AT397332B - TRAIN RELIEF - Google Patents

Description

AT 397 332 B

The present invention relates to a strain relief for a cable to be inserted into a housing with a housing-fixed first arm and a second arm movable relative to the first, between which the cable is clamped, at least one of the arms having a recess adapted to the cable profile.

Such strain reliefs are generally known in electrical devices. They serve to relieve the strain on the electrical cable to be inserted into the housing of the electrical device, it generally being known in the prior art what diameter the cable to be inserted and clamped has

With control devices of the most varied types, there is a need to relieve the strain on cables of different sizes and crushing ability. Thus, the recesses of the individual strain reliefs in the arms would have to be kept of different sizes, for example to clamp and relieve strain on three-phase supply cables on the one hand and hydraulic capillaries on the other, whereby cable cross-sections are often used when retrofitting such controllers, for which the strain relief does not apply when the device is created was thought.

From DE-OS 37 31 149 a strain relief for connecting cords of different diameters has become known, in which the connecting cord to be relieved of strain is already provided in its insertion area with a terminating part which is positively encompassed by an adapter which can be inserted and fixed in an appliance opening. A disadvantage here is, in addition to the problem of fastening the end part on the connecting cord, above all the considerable space requirement.

Another cable holder is described in DE-OS 34 28 258. To adapt to different cable diameters, a device with a plurality of annular receiving areas is provided, these being interconnected by walls of reduced cross-section. By means of these walls, which represent predetermined breaking points, the concentrically nested annular receiving areas can be enlarged by breaking them out. However, it is not possible to reduce the size of the opening for cable entry.

The present invention has for its object to provide a simple strain relief for cables and similar supply lines, in which retrofitting is possible to the extent that cables of different diameters, profile shape and crushing ability can also be subsequently relieved of strain.

The solution to the problem is according to the invention that a polygonal plate is provided which has different recesses in profile on its narrow sides and can be interchangeably inserted into a housing pocket

This configuration has the advantage that, for example in the case of a square square plate, four different recesses can be incorporated into the four narrow sides of the plate, the requirements for the diameter variants of the cables to be clamped being largely met. If a relatively small diameter cable is first clamped, the smallest recess is sufficient. If a larger diameter cable has to be clamped at this point later due to the addition of additional wires, the plate is rotated and reinserted so that a recess with a larger diameter then comes into play.

Further refinements and particularly advantageous developments of the invention emerge from the remaining claims and the following description, which explains an embodiment of the invention in more detail.

Show it:

FIG. 1 shows the strain relief in an exploded view,

Figure 2 shows the strain relief in plan view and

Figure 3 shows a section through the fully assembled strain relief.

In all three figures, the same reference numerals denote the same details.

A housing (1) of a device (not shown further), for example a control unit or an electrically or gas or oil-heated heating device, has a side (2) on which a strain relief (3) is attached. The strain relief (3) consists essentially of a first arm (4) and a second arm (5), the arm (4) being fixed to the housing. The arm (4) consists in particular of a first bracket (6) and a second bracket (7), both of which are attached to the side (2) of the housing (1) or, in most cases, are injection molded (plastic). The trestles (6) and (7) each have a threaded hole (10) on their sides (8) and (9) facing away from the housing (1), in each of which a screw (20) engages. The second arm (5) is held on the two trestles (6) and (7) by means of these screws (20). The cable (11) to be relieved of tension is squeezed between the arms (4) and (5) by tightening the screws (20). The arm (4) is constructed in detail, as shown in more detail in FIG. 3. Between the two trestles (6) and (7), two walls (12) and (13) extend parallel to one another and leave a housing pocket (14) between them. In the housing pocket (14), a polygonal plate (15) is mounted such that it can be plugged over. On each of these - in this exemplary embodiment - four sides - as shown in FIG. 2 - each has a recess (16), (17), (18) and (19 ) which differ in the diameter of the approximate semicircle they form. Depending on which of the recesses (16) to (19) is opposite the arm (5), it is possible to reliably clamp a cable (11) of relatively large or small diameter and thus to relieve strain. It should be noted at this point that the strain relief does not necessarily have to be an electrical cable, it -2-

Claims (2)

AT 397 332 B wire strands or capillaries or similar hydraulic lines would also be conceivable. If such a larger diameter is to be clamped instead of a relatively small cable (11), the screws (20) are unscrewed from the threaded holes (10). After removing or pivoting the arm (5), the polygonal plate (15) can be removed and repositioned. It is then repositioned in such a way that the recess (16) to (19) which best fits in it faces the cable (11). A reduction in diameter of the cable to be clamped is also conceivable. If the diameter variant is too large, it is also possible to replace the polygon plate (15) and to insert one with different recesses in the housing pocket (14). The recesses (16) to (19) do not necessarily have to be circular, oval quadrangular or triangular recesses can also occur. It is essential that a housing pocket (14) is formed from the two trestles (6) and (7) and the two walls (12) and (13), into which the polygonal plate (15) is inserted. PATENT CLAIMS 1. Strain relief for a cable to be inserted into a housing with a housing-fixed first arm and a second arm movable relative to the latch, between which the cable is clamped, at least one of the arms having a recess adapted to the cable profile, characterized in that a polygonal plate (15) It is provided which has different recesses (16 ... 19) on its narrow sides in profile and can be exchangeably inserted into a housing pocket (14) of an arm 2. Strain relief according to claim 1, characterized in that the polygonal plate (15) is designed as a square square plate which has four recesses (16 ... 19) with an approximately semicircular cross-section. 2 sheet drawings -3-