Chung Chiu-Mi Chen

US Patent:

52900738, Mar 1, 1994

Filed:

Apr 2, 1992

Appl. No.:

7/862133

Inventors:

Chung F. Chen - Mission Viejo CA

International Classification:

F16L 3900
F16J 1510

US Classification:

2851371

Abstract:

An expansion seal for sealing pipe through which electrical cables are arranged to pass comprises an elastic ring, a plurality of upper clamping plates and a plurality of lower clamping plates each preferably of plastics or rubber material. The elastic ring is supported between a plurality of the upper and lower clamping plates, at the circumference of this elastic ring having a slit to allow insertion of cable therein and to cover the cable easily. The elastic ring and cable is locatable in a cable pipe and fixed at one end of the cable pipe by screw bolts. When the bolts are tightened addition a compressive force on the upper clamping plates the elastic ring extends inwardly to fill the space between the inner wall of the elastic ring and cable and outwardly to fill the space between the elastic sealing ring and inner surface of the cable pipe, to prevent liquid, mud and moisture from entering into the cable pipe. Conveniently, the expansion seal can be applied to pipes of different inner diameter and cable of different outer diameters.