Longitudinal load limiting devices for transmission lines and the like
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United States of America Patent
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Jun 8, 2010
Grant Date -
N/A
app pub date -
Dec 16, 2005
filing date -
Dec 19, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for limiting loads on towers that limits loads only in the longitudinal direction and does not affect the manner in which vertical and transverse loads are resisted by the structure. The device incorporates a shield to prevent ice buildup that could affect its operation. It also has optional antifriction bearings to provide a consistent release force independent of the amount of ice that may accumulate on the wires. The device is of simple construction. The device includes an optional energy absorber, such as that used in U.S. Pat. No. 3,211,260 that can provide a resisting force that is within the longitudinal strength of the tower. The device includes both a mechanical fuse and an energy absorbing mechanism that is used to arrest the wire movement. The energy absorber can extend as much as 50 ft to safely absorb the energy released by broken wires with heavy ice coatings.
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