Telecommunications enclosure including containment structures for O-rings

1. A telecommunications enclosure comprising:

an upper dome having a cylindrical lower end centered about a central axis;

a lower base that mounts at the cylindrical lower end, the lower base including a seal channel that encircles the central axis when the lower base is mounted at the lower end of the upper dome, the seal channel having an open top opposite from a channel bottom surface, the channel bottom surface extending radially outwardly to an outer circumferential lip that projects upwardly from the channel bottom surface, the channel bottom surface angling upwardly as the channel bottom surface extends radially away from the central axis to the outer circumferential lip;

the lower end of the upper dome and an upper end of the lower base including outer flanges that extend circumferentially about the central axis and that are adjacent to one another when the upper dome and the lower base are mounted together;

an O-ring seal that mounts in the seal channel and is compressed between the upper dome and the lower base to provide sealing thereinbetween; and

a clamp that mounts about the outer flanges of the upper dome and the lower base, the clamp defining a clamp channel that receives the outer flanges.

2. The telecommunications enclosure of claim 1 , wherein the clamp is oval.

3. The telecommunications enclosure of claim 2 , wherein the flanges can move less than 2 millimeters relative to the clamp after tightening of the clamp.

4. The telecommunications enclosure of claim 1 , wherein the upper dome includes a seal containment surface that encloses the open top of the seal channel when the lower base is mounted to the upper dome.

5. The telecommunications enclosure of claim 4 , wherein the seal containment surface is oriented along a reference plane perpendicular relative to the central axis.

6. The telecommunications enclosure of claim 5 , wherein the upper dome includes a downwardly projecting circumferential lip that extends outside and exterior of the circumferential lip of the lower base.

7. A telecommunications enclosure comprising:

an upper dome having a cylindrical lower end centered about a central axis;

a lower base that mounts at the cylindrical lower end, the lower base including a sealing surface that encircles the central axis when the lower base is mounted at the lower end of the upper dome;

the lower end of the upper dome and an upper end of the lower base including outer flanges that extend circumferentially about the central axis and that are adjacent to one another when the upper dome and the lower base are mounted together;

an O-ring seal that is compressed between the upper dome and the lower base to provide sealing thereinbetween; and

a clamp that mounts about the outer flanges of the upper dome and the lower base, the clamp defining a clamp channel that receives the outer flanges;

the upper dome includes a sealing surface that opposes the sealing surface of the lower base when the lower base is mounted to the upper dome, wherein an O-ring seal is compressed between the sealing surface of the upper dome and the sealing surface of the lower base, and wherein the sealing surface of the lower base angles upwardly as the sealing surface of the lower base extends radially away from the central axis or the sealing surface of the upper dome angles downwardly as the sealing surface of the upper dome extends radially away from the central axis.

8. The telecommunications enclosure of claim 7 , wherein at least one of the upper dome or the lower base includes a containment lip that circumferentially surrounds the O-ring.

9. The telecommunications enclosure of claim 8 , wherein the upper dome includes a downwardly extending circumferential lip and the lower base includes an upwardly extending circumferential lip, and wherein the upwardly and downwardly extending circumferential lips overlap one another when the upper dome and the lower base are secured together.

10. A telecommunications enclosure comprising:

a dome having an open end and a closed end;

a hollow base that mounts at the open end of the dome with the base and the dome aligned along a common central axis, the base including a seal channel that extends around the central axis, the seal channel having an open side opposite from a channel bed, the channel bed extending outwardly from the central axis to an outer lip that projects from the channel bed in a direction toward the dome, the channel bed angling toward the dome as the channel bed extends away from the central axis to the outer lip and the outer lip extending about the central axis;

the dome and the base including outer flanges that extend about the central axis and that are adjacent to one another when the dome and the base are mounted together;

a seal that mounts in the seal channel and is compressed between the dome and the channel bed of the base to provide sealing thereinbetween; and

a clamp that mounts about the outer flanges of the dome and the base, the clamp defining a clamp channel that receives the outer flanges.

11. The telecommunications enclosure of claim 10 , wherein the dome and the base have cross-sectional profiles that are circular.

12. The telecommunications enclosure of claim 11 , wherein the seal is an O-ring seal having a circular cross-section prior to being compressed between the base and the dome.