Joints and connections – Including frangible component
Patent
1989-05-18
1991-01-22
Kundrat, Andrew V.
Joints and connections
Including frangible component
403 24, 403286, 403293, 256 131, F16B 700
Patent
active
049866877
ABSTRACT:
A breakaway system is disclosed for timber utility poles. The breakaway system limits the amount of force and energy imparted to an impacting vehicle and its occupants by incorporating an arrangement of slip plates and bolts to form a shear plane on the utility pole at or near ground level, and by providing a hinge mechanism on an upper section of the utility pole below conducting lines and the like. The material and configuration of the lower shear plates are selected to permit activation for any direction of collision loading. The material and configuration of the upper connection or hinge are selected to allow for adequate resistance to environmental loads while at the same time allowing for precise determination of the magnitude of failure load. In addition, the combination of upper connectors prevents the lower portion of the utility pole from rotating upward into the conducting wires after a vehicle impact. In this manner, impact by a moving vehicle with a timber utility pole equipped with the breakaway device shears the lower connection causing a middle portion of the timber utility pole to rotate upward. The upper connection allows limited rotation sufficient to permit the impacting vehicle safely to travel completely beneath the middle section of the utility pole while at the same time preventing the middle section from impacting the conducting wires carried by the utility pole.
REFERENCES:
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J. Labra, C. Kimball, Jr., Development of Safer Utility Poles, Jan. 1983, Southwest Research Institute, Houston, Texas, pp. 1-25.
H. J. Hignett, High Speed Impact Test on a 40 ft Lighting Column Fitted with a Break-away Joint, Crawthorne Roadside Research Laboratory, Ministry of Transport, RRL Report LR 67, 1967.
T. C. Edwards, J. E. Martinez, W. F. McFarland, H. E. Ross, Jr., Development of Design Criteria for Safer Luminaire Supports, National Cooperative Highway Research Program Report 77, Highway Research Board, 1969.
R. M. Olson, N. J. Rowan, T. C. Edwards, Break-Away Components Produce Safer Roadside Signs, published in Highway Research Record No. 174, 1967.
Don L. Ivey and James R. Morgan, Safer Timber Utility Poles, DTFH 61-83-0-00009, Sep. 1985.
DeLiguori Franco S.
Kundrat Andrew V.
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