Release of stresses for fibre optic cables and switching cords

FIELD: electricity.

SUBSTANCE: connector for a fibre-optic cable or connection of switching cords comprises a body, an adapter for an optical connector, a holder for an adapter and a facility to release stresses in a cable or a cord attached to a body. The holder may be integral with the body or be fixed on it or in it, and provides for limited displacement along the adapter axis inside the holder. The value of axial shift is more than the value of shift from bending deformation of the body, which is caused in the place of fixation of the facility for release of stresses by means of manual withdrawal of a cable or a cord from the body.

EFFECT: reduced effect of body deformation as a result of pulling along an axis caused by any type of applied stress on a cable or a cord, release of stresses from a cable inside a slot.

5 cl, 8 dwg

 

The present invention relates to relieve stress is equipped with connectors of fiber optic cables and patch cords, which, in particular, used in compounds of the type "fiber to the home" (FTTH) Fiber to every home) (eng. Fiber to the premises FTTP or Fiber to the home, FTTH) is a term used by telecommunications providers to refer to a broadband telecommunications system based on conducting fibre channel, and it is completed on-site end-user through the installation of optical terminal equipment to provide telecommunications services complex).

Means for relieving stresses are used to commit equipped with a connector of a fiber optic cable or patch cord extending from the housing or any other solid part of the permanent connection or junction box or other enclosure. This can be done by any conventional means for attaching, for example, by fastening with a suitable form of connector on this cable or cord in the hole of the cap or other closing means, which closes in the lateral direction with respect to the axis of the optical fiber, as is done in the connection box FTTH from Tyco Electronics under the trademark "Xpress drop. The preferred embodiment of the means for cleared what I stress is an optical connector, having the slit (slit) between the two protrusions that are on the side (relative to the longitudinal axis of the cable or cord), where the slit can be performed on the body or another similar to a wall part of the junction box or enclosure.

The present invention provides a shell (junction box) fiber-optic cable or connection cords, comprising a housing, the adapter optical connection, a holder for the optical adapter connection and a means of stress relieving cable or cord fastened on the cover, in which the holder is a single integer, or fixed, or can be fixed inside the housing and allow limited axial movement of the adapter inside the holder on the axial displacement of more than the amount of displacement from the Flexural deformation of the body, which is caused at the place of application of stress relieving by pulling by hand on the cable or cord on the outside of the cover.

In one preferred embodiment, the housing is closing around the adapter and holder for attachment of a cable or cord to the housing, and the housing includes a spacer which, when the closure body has the effect that pushes the adapter into the holder from the housing for axial displacement larger than the amount of displacement from the Flexural deformation is then covers, which occurs at the point of application of stress relieving by pulling by hand on the cable or cord on the outside of the cover.

Thus, providing preventive (failsafe) the axial displacement or backward pushing adapter, this invention allows to obtain a reliable value of the interval between the displacement and the bending of the body with minimal risk of interruption of the signal that leads to a reliable connection that meets the technological requirements for retention in a fast and easy connection.

This inventive concept thus reduces the negative effect of deformation due to axial tension caused by any type of the applied tensile forces on the cable or cord with connectors that would otherwise be disconnected or could be broken connection formed corresponding connector within the adapter. This can be especially useful in applications FTTH, because we see that these appliances have a relatively high risk of impact and the efforts of the margin.

In all embodiments of the invention it is preferable that the specified axial displacement or offset in a reverse shot put was more than offset from the bending deformation caused by the maximum tensile force applied to the cable is or cord without displacement of application place of application of stress relieving. The body is made of plastic and has a thickness in the range from 0.5 mm to 4 mm Spacer at work preferably placed so as to perform preventive (failsafe) axial displacement of the adapter back at least 0.2 mm, preferably at least 1 mm, preferably at least 2 mm of the Enclosure can be made of plastic and preferably have a thickness in the range from 0.5 mm to 4 mm Adapter is preferably introduced with a snap in holder.

The holder may be a stand-alone part or component with another component of the housing. Preferably the adapter is installed in the holder by means of horizontal or vertical zagibayuschihsya inside sponges that resist accidental removal of the installed adapter from the holder.

In preferred versions of the adapter may be initially in an extended forward position, and mechanism for closing the shell (preferably with lids) can have a sash or other inclinations, which glide along the axis of the fiber when closing the shell (preferably with lid) and hook the adapter or related components in order to make the cable and adapter to move back into the holder on some interval along the axis, greater than the interval deformation bending of the cover, which can strecht is by practice.

Enclosing the housing, the holder, adapter and other components in accordance with the present invention can be made of any suitable material, preferably of technical plastics using any suitable manufacturing methods, preferably by injection molding, which is well known.

A particular variant embodiment of the invention will now be described in more detail as an example with reference to the accompanying drawings, in which:

Figure 1 illustrates in perspective the connector FTTH in the open, semi-closed or fully closed state.

Figure 2 illustrates in perspective a box of figure 1 with the right hand and an alternative view of the boxes in the picture on the left side of figure 1.

Figure 3 illustrates more the stopper formed on the inside of the lid.

Figure 4 illustrates in more detail the adapter and the holder according to the invention.

5 and 6 schematically illustrate views from the side and partly in section the action of the limiter on the position of the adapter inside the holder according to the invention.

Figa and 7B illustrate an alternative embodiment of the invention in which the adapter is located right in the holder without the action of closing the lid.

1 shows in perspective an example of the junction box 10 "Xpress drop FTTH according to the of the present invention, having a body that includes a sliding cover 20, and the outlet of the fiber optic cable 42 is connected to the junction box via the optical connector 40 of a known type. The cover 20 has a slot 30, which gradually grasps the connector 40 to secure the cable in the box when the cover 20 is moved from the open position shown in top form, through the half-closed position, on average, before reaching the fully closed position, shown at the bottom.

Figure 2 shows a connection box to the right in figure 1 and the left alternative view of the boxes, in which the whole upper cover 50 you want to insert from sliding in the bearing, thus grasping the connector is similar to the action of a separate cover, shown in the right view, and in figure 1.

Figure 3 shows a magnified portion of the inner side of the cover 20 and the spacer 60 having the form of a wedge-shaped ribs on each side of the slot 30. This view also shows the short rollers (fingers) 70, which are designed for installation with the possibility of rotation of the cover as an alternative to sliding movement of the cover in figure 1.

Figure 4 illustrates a view in perspective and in terms of the holder 90, which is located inside the junction box (not shown in this view), preferably comprising one or attached to the body Il is/and the base. Figure 4 also shows the adapter 80, is placed in the holder with lock adapter after holding protrusions 100. In the adapter 80 includes a cable connector 40, and the adapter can be moved inside the holder at a specified distance Δ between the projections 100 and the locking surface 110. Distance Δ greater than the maximum possible interval offset from the bending deformation of the body under normal traction force of the cable at the connection point where the frame holds the cable connector 40 into the slots 30. Thus, the adapter 80 is able to "float" on the distance Δ, allowing the edges of the spacer 60 to move the adapter from the cable connection of the housing when the cover 20 is closed, as shown in figure 5 and 6.

Figure 5 and 6 cable now lies upright, as he usually lies when the junction box 10 is installed on the wall of a dwelling house, and these figures show a holder and an adapter with a side partial section and front view, respectively, of figures left and right. On the side view, figure 5, shows the closing cover 20, close to the cable connector 40 in the direction of the arrow And just before the slot 30 (not visible in this view) began to capture the connector. The adapter 80 is shown in its most forward position inside the holder 90 is ready to move healthy lifestyles in the research Institute of the arrow, as shown in the front view, when the edges of the spacers 60 are taking the connector 40 when closing the cover 20. 6 shows the fully closed position of the lid 20, in which the edges of the spacer 60 has captured the connector 40 and thereby pushed the adapter 80 back in the holder 90 at a distance α ("alpha"), which may be less than the available distance "sailing" Δ (figure 4), provided that the distance α (alpha) over the interval offset from the bending deformation of the body, as mentioned above. The size and shape of the ribs of the spacer 60 is selected to provide an automatic safety pushing back of the adapter 80, which provides sufficient clearance to avoid or at least reduce the risk of bending deformation caused by axial tensile forces (axial tension) cable that terminates the optical connection inside the adapter.

It should be understood in relation to all types of inventions that if the adapter 80 would be in a fixed position relative to the cover 20 (corps), the Flexural deformation of the body by the action of the cable tensile strength could take away and destroy the direct optical connection is formed inside the adapter shown between the connector 40 and the other cable or optical device {not shown), for example, by typing in protivopul iny port 120 of the adapter, shown in figure 5 and 6. The shape of the spacer is not critical, provided that it ensures the achievement of this effect. You can use alternative types of spacers, which includes, for example, the protrusions adapted to directly push the adapter, front approaching him when closing hinge cover without slipping or becoming jammed steps shown the wedge-shaped ribs 60. In the preferred enclosures (junction boxes) according to this invention, having a thickness of the plastic casing in the range from 0.5 mm to 4 mm, the spacer is positioned to create a safety distance interval of the axial pushing back at least 0.2 mm, more preferably at least 1 mm, up to 2 mm.

Figa shows the shell (junction box) optical cable, which has open holders, which can directly insert the adapter optical connections with limited space to move or "swim" inside holders according to the invention without the impact of the closing of the cover described above. Figv shows a more detailed view of one of the holders 90, which may be one unit or separately attached to the portion 130 of the housing and/or base 140 of the shell (terminal box). Optical is Abel 42 has a connector 40 with the shoulder, located in the slots serving up part 130 of the shell casing to create a stress relieving. The adapter 80 of the optical connector is directly (preferably locked) into the holder 90 with the above-mentioned axial movement of the adapter in the holder on the interval offset greater than the interval offset from the bending deformation portion 130 of the body caused by the force of the tension from the cable 42.

The resulting axial effect of "floating" and thereby avoid or reduce the risk of violations of optical connections (not visible in this view) within the adapter between the optical fiber cable 42 and the fiber cable 44, a co-working them in and out of the main body shell (junction box), shown in figa.

1. The shell (10) for fiber optic cable or patch cord connections, comprising a housing (50), the coupler (80) optical connection holder (90) adapter for optical connection and a means of stress relieving cable or cord, characterized in that the tool stress relieving cable or cord is attached to the housing (50) for fixing the drop cable or cord with a connector on the housing (50)and the holder (90) is one integer, or fixed or can be fixed inside the housing (50) and allows limited axial peremeshany the adapter (80) inside holder (90) for the axial displacement of greater than the amount of displacement from the Flexural deformation of the casing (50), which is caused at the place of application of stress relieving by pulling by hand on the cable or cord on the outside of the cover (50).

2. Shell according to claim 1, in which the housing (50) is closed around the coupler (80) and holder (90) to attach the cable or cord to the housing, and the housing (50) includes a spacer (60), which when closing the housing has the effect that pushes the adapter into the holder from the housing (50) for the axial displacement of greater than the amount of displacement from the Flexural deformation of the body, which occurs at the point of application of stress relieving by pulling by hand on the cable or cord on the outside of the cover.

3. Shell according to claim 1, in which the mentioned interval of axial displacement is greater than the offset from the bending deformation of the cover caused by the maximum thrust force applied to the cable without moving the point of application of stress relieving.

4. Shell according to claim 2, in which the cover (50) is made of plastic and has a thickness of from 0.5 to 4 mm, and the spacer is placed so as to perform safety axial displacement of the coupler (80) back at least 0.2 mm, preferably at least 1 mm, preferably at least 2 mm,

5. The sheath according to any one of the preceding paragraphs, in which the adapter is latched into a holding is barely.



 

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Light guide // 2248023

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FIELD: electricity.

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22 cl, 6 dwg

FIELD: physics.

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EFFECT: simple design.

20 cl, 11 dwg

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