Cable strain relief clamping devices and methods for using the same
View Patent ↗A closure device for receiving a fiber optic cable includes an enclosure defining a splice chamber configured to accommodate splices to the plurality of optical fibers. The enclosure has a clamp receiving section therein. The closure device further includes a clamping device configured to concurrently secure the remaining portion of the jacket and the strength member at a same clamp interface of the clamping device. The clamping device is configured to be removably inserted into the clamp receiving section of the enclosure. The clamp receiving section is configured to fixedly limit movement of the clamping device relative to the enclosure when the clamping device is installed therein to secure the remaining portion of the jacket and the strength member secured in the clamping device to the enclosure.
1. A clamping device for a fiber optic cable, the cable having a lengthwise cable axis and including a plurality of optical fibers, a strength member and a jacket surrounding the optical fibers having a section thereof partially removed in a scalloped configuration that exposes an underlying section of the strength member while leaving a remaining portion of the jacket extending under the strength member, the clamping device comprising:
a first clamp member having a receiving channel therein configured to receive the remaining portion of the jacket;
a second clamp member having a first face configured to be received in the receiving channel of the first clamp member with the remaining portion of the jacket and the strength member positioned between the first clamp member and the second clamp member and a second face, opposite the first face, including a region configured to receive the plurality of optical fibers; and
a coupling member that couples the first clamp member and the second clamp member and is configured to provide sufficient force between the first clamp member and the first face of the second clamp member to limit lengthwise movement of the strength member and remaining portion of the jacket therebetween, wherein the coupling member extends at least partially through the first clamp member and the second clamp member and is positioned to extend through the remaining portion of the jacket when the remaining portion of the jacket is positioned therebetween.
2. The clamping device of claim 1 , wherein the region of the second clamp member configured to receive the plurality of optical fibers comprises a receiving channel.
3. The clamping device of claim 1 , wherein at least one of the receiving channel of the first clamp member and the first face of the second clamp member includes ridges configured to deform the strength member when the strength member is secured therebetween to increase a force required to produce lengthwise movement of the strength member.
4. The clamping device of claim 1 , wherein both the receiving channel of the first clamp member and the first face of the second clamp member include at least one ridge extending transversely substantially there across in alternating lengthwise locations configured to deform the strength member into a serpentine shape.
5. A closure device including the clamping device of claim 1 fixedly secured in an enclosure with the remaining portion of the jacket and the strength member secured in the clamping device to limit movement of the cable relative to the enclosure.
6. The clamping device of claim 1 , wherein the first clamp member and the second clamp member comprise a first clamping device and further comprising a second clamping device configured to be coupled to the first clamping device, wherein the first clamping device and the second clamping device comprise a clamping device assembly, wherein the second clamping device has a first clamp member and a second clamp member configured to receive a second remaining portion of a jacket of a fiber optic cable and a second strength member therebetween and wherein the coupling member is configured to couple the first clamp member and second clamp member of the second clamping device to provide sufficient force between the first clamp member and the second clamp member of the second clamping device to limit lengthwise movement of the second strength member and second remaining portion of the jacket therebetween and to couple the first clamping device to the second clamping device to define the clamping device assembly.
7. The clamping device of claim 6 , wherein the coupling member extends at least partially through the first clamp member and the second clamp member of the first clamping device and at least partially through the first clamp member and the second clamp member of the second clamping device and wherein the region of the second clamp member configured to receive the plurality of optical fibers comprises a curved face of the first clamp member of the first clamping device.
8. The clamping device of claim 7 , wherein the first clamp member and the second clamp member of the first clamping device are configured to deform the strength member into a serpentine shape when the strength member is secured therebetween to increase a force required to produce lengthwise movement of the strength member therebetween and wherein the first clamp member and the second clamp member of the second clamping device are configured to deform the second strength member into a serpentine shape when the strength member is secured therebetween to increase a force required to produce lengthwise movement of the strength member therebetween.
9. The clamping device of claim 7 , further comprising a first mating feature on the first clamping device and a corresponding second mating feature on the second clamping device, wherein the first and second mating features are configured to limit relative lengthwise movement between the first and second clamping devices in at least one lengthwise direction.
10. The clamping device of claim 9 , wherein the first mating feature comprises a first transverse face on the first clamping device and the second mating feature comprises a second transverse face on the second clamping device and wherein the first transverse face abuts the second transverse face when the first clamping device is coupled to the second clamping device to rigidly limit relative lengthwise movement between the clamping devices in one direction.
11. The clamping device of claim 10 , wherein the first clamping device is configured to slidably couple to the second clamping device and wherein the first mating feature further comprises a key member on the first clamping device and the second mating feature further comprises a receiving channel on the second clamping device that is configured to slidably receive the key member and wherein the key member may be advanced in the receiving channel in the one direction until the first transverse face abuts the second transverse face and the key member may be advanced in an opposite lengthwise direction to remove the key member from the receiving channel.