DE9400380U1 - Glass fiber splice cassette with fiber interception device - Google Patents

Description

Applicant: Quante AG Uellendahler Str. 353

42007 Wuppertal

Keyword: Fiber optic splice tray with fiber optic splice device

The invention relates to a fiber optic splice cassette with a fiber interception device arranged at the entrance and a downstream splice protection holder according to the preamble of claim 1.

Fiber optic splice cassettes are known for connecting and/or branching incoming and outgoing fiber optics or fiber optic cables, which ensure clear and damage-free fiber routing and accommodation of the connecting splice point. The cables introduced into these splice cassettes must be mechanically supported in the respective introduction areas in order to keep tensile and shear forces away from the reserve lengths of the fibers and from the splice points in the respective splice cassette during assembly work with the complete splice cassettes, e.g. when accommodating them in distribution devices.

The introduced glass fibers or glass fiber cables are bundled together with loop bands and secured to the splice cassette housing. This is a disadvantage because the bundled glass fibers are exposed to the radial forces of the loop band to varying degrees and exhibit different behavior under axial tensile and compressive forces. When replacing a glass fiber or retrofitting it, the respective bundle of fibers must also be opened, whereby there is no movement absorption during this period.

According to EP 0503 614 A1, a strain relief device for glass fibers is known which holds the glass fibers to be secured next to one another in a comb-like plastic part. The glass fiber is inserted into slots in adjacent tongues, which act as a push-through holder in the upper area of the slots and clamp the fiber in a strain-relieving manner in the lower area. This device is equipped with a latch on the bottom of the device for installation, e.g. in a distributor or the like.

The disadvantage of this strain relief device is that the slots between the tongues of this component are only adapted to one cable diameter and the cable can only be clamped at one point of its

Surface is mechanically fixed in its longitudinal course. For different cable diameters, different strain relief devices must be stocked and used. Clamping the cable at only one point on its surface is problematic because, on the one hand, sufficient force must be applied to counteract axial tensile and compressive stresses and, on the other hand, the radially acting force leads to deformation of the cable cross-section, associated with changes in the transmission properties.

The invention is based on the object of developing a fiber optic splice cassette with a fiber interception device according to the preamble of claim 1 in such a way that the aforementioned mechanical, logistical and assembly-related disadvantages of the strain relief device are avoided, without requiring greater technical effort.

The task is solved in a fiber optic splice cassette according to the preamble of claim 1 by the characterizing features of this claim. The advantages that can be achieved with the invention are in particular that the fiber interception device optimally fixes more than one fiber or cable diameter type mechanically, whereby the axial tensile and compressive forces are distributed over several areas in the device and applied to the fiber/cable outer area. Furthermore, by axially shifting the clamping areas located one behind the other, the tensile and compressive relief of the fibers in relation to the reserve lengths and their splice points inside the splice cassette can be increased by the flexural rigidity of the glass fibers or fiber optic cables. The splice protection holder arranged downstream of the fiber interception device in the splice cassette is attached to the cassette base without any separate fastening means, namely by locking.

An embodiment of the invention will be illustrated with reference to the figures of the drawings and described in more detail below.

Show it:

Figure 1 is a top view of a fiber optic splice cassette with a fiber interception device and a splice protection holder

Figure 2 shows a section through the fiber interception device along the line A/A in Figure 1 Figure 3 shows a plan view of the fiber interception device in Figure 1 on an enlarged scale

Figure 1 shows a complete splice cassette 1 with a fiber interception device 2 at one of the 4 possible fiber/cable entry openings 3 - 6, downstream of which are fiber guide means 7, 8 and splice protection holder 9. The splice protection holder 9 is fixed in the area of its molded eye 34 by spring-loaded locking hooks 35; 36 which pass through it. The locking hooks 35;

are, as are centering pins 37; 38, which secure the splice protection holder 9 against rotation, formed in one piece on the base plate 14 of the splice cassette 1.

According to Figure 2, the fiber interception device 2 consists of a connecting piece 10 that has U-profiles 11; 12 formed in one piece on both ends. These U-profiles 11; 12 pass through the correspondingly designed base plate 14 of the splice cassette 1 with the locking profile 13 and they encompass the edge area 15 of the splice cassette that is perpendicular to the base plate 14. The U-profile 11 lies in an opening 16 in the base plate 14, while the U-profile 12 lies in an edge recess 17 in the edge area 15. This mechanically fixes the fiber interception device 2 in the splice cassette 1. Clamping profiles 18; 19 are formed on both sides of the connecting piece 10, which have distances 20; 21 adapted to accommodate glass fiber/fiber optic cables with different outer diameters. 21. Since the fiber interception device 2 is designed symmetrically about its transverse axis 22, it can be adapted to different fiber/cable outer diameters by simply turning it.

From Figure 3 it can be seen that the clamping profiles 18 have a distance 20 adapted to the glass fiber/fiber optic cable outer diameter, whereby approximately V-shaped clamping ribs 24 - 26 or 27 - 29 arranged in the longitudinal direction 23 of the fiber mechanically fix an inserted fiber 30. The course of the fiber 30 through the clamping profiles 31; 32 can also run in a partially bent longitudinal axis 33 in the gill area if these are designed in this way. Marking surfaces 39 between the clamping profiles 18; 19 serve to reliably identify the glass fiber/fiber optic cable to be handled during installation and switching work.

The invention is not limited to the embodiment shown, but other designs are also possible. For example, the connecting piece can not only have clamping profiles for the glass fibers/glass fiber cables on the two opposite sides, but can also be square in cross-section so that clamping profiles can be arranged on 4 outer sides. The end profiles at the ends have been modified accordingly for mechanical fastening.

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Reference list

1 - Splice cassette

2 - Fiber interception device 3-6 - Fiber insertion openings 7 + 8 - Fiber guiding means

9 - Splice protection holder

10 - Connecting piece 11+12 - U-profiles

13 - Locking profile

14 - Base plate of 1

15 - Edge area of 1

16 - Breakthrough in 14

17 - Edge recess in

18 + 19 - Clamping profiles

20 + 21 - distances of 18 and

22 - Transverse axis

23 - Longitudinal fibre direction 24-29 - Clamping ribs on 18

30 - Fiber optic/fiber optic cable

31+32 - Clamping profiles

33 - bent longitudinal axis

34 - Mounting eye of

35 + 36 - locking hooks on 14 37 + 38 - centering pins

39 - Marking area

3 S äs

Claims (11)

CDuantE Protection Claims 1. Splice cassette made of plastic for glass fibers and glass fiber cables in telecommunications technology with insertable fiber interception devices for inserted individual glass fibers or glass fiber cables, which accommodate these next to one another in one plane and at least one splice protection holder and guide means for the fiber reserve lengths, characterized in that the fiber interception device (2) fixes at least two glass fibers/glass fiber cables (30) with different outer diameters in a tension and shear-absorbing manner. 2. Splice cassette with fiber interception device according to claim 1, characterized in that the glass fibers/glass fiber cables (30) are fixed in the fiber interception device (2) to absorb tension and shear forces on two or more clamping ribs (25/28; 26/27) positioned one behind the other in the fiber longitudinal direction (23). 3. Splice cassette with fiber interception device according to claim 1 and 2, characterized in that the fiber interception device (2) can be mounted in the splice cassette (1) so as to be rotatable by 180° about its transverse axis (23). 4. Splice cassette with fiber interception device according to the preceding claims, characterized in that the distance (20; 21) of the clamping profiles (18; 19) of the fiber interception device (2) on opposite sides of the connecting piece (10) is designed for different external diameters of the glass fiber/glass fiber cable (30) to be fixed. 5. Splice cassette with fiber interception device according to the preceding claims, characterized in that the fiber interception device (2) is designed in its two end regions as U-shaped profiles (11; 12). 6. Splice cassette with fiber interception device according to claim 4, characterized in that the fiber interception device (2) with the U-shaped profiles (11; 12) is clamped in the edge cutouts (17) of the edge region (15) and latched with the latching profile (13) in the opening (16) of the base plate (14) of the splice cassette (1) against fiber tensile and shear forces. 7. Splice cassette with fiber interception device according to the preceding claims, characterized in that the clamping profiles (18; 19) provided on the fiber interception device (2) have approximately V-shaped, opposing clamping ribs (26/27; 25/28). 8. Splice cassette with fiber interception device according to the preceding claims, characterized in that the course of the glass fiber/glass fiber cable (30) to be intercepted between the clamping profiles (18; 19) of the fiber interception device (2) takes place in a straight longitudinal direction (23). 9. Splice cassette with fiber interception device according to the preceding claims, characterized in that the course of the glass fiber/glass fiber cable (30) to be intercepted takes place between the clamping profiles (31; 32) of the fiber interception device (2) with a bent longitudinal axis (33). 10. Splice cassette with fiber interception device according to the preceding claims, characterized in that an identification surface (39) is arranged next to two associated clamping profiles (18) for securing a glass fiber/glass fiber cable (30). 11. Splice cassette with fiber interception device according to the preceding claims, characterized in that the splice protection holder (9) arranged downstream of the fiber interception device (2) is secured against rotation by centering pins (37; 38) and locking hooks (35; 36) on the base plate (14) of the splice cassette (1) in the fastening eye (34).