Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1980-04-25
1981-11-17
Thibodeau, Paul J.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
280819, 428114, 428220, 428295, 428367, 428392, 428902, B32B 108, B32B 528
Patent
active
043012019
ABSTRACT:
A ski pole shaft defined by a tubular element formed of a plurality of continuous filaments extending substantially rectilinearly end to end of the element and spaced in an annular array about the axis of element. The filaments are embedded in a matrix of set synthetic resin and are maintained in a longitudinally stressed condition by the set resin so as to define a prestressed tubular shaft wall.
The shaft wall may have an outer diameter of approximately 10 times the thickness of the wall. In one embodiment the wall has a thickness of approximately 0.07 inches. The filaments in the illustrated embodiment are stressed to approximately 5 to 10% of their breaking stress. The filaments in the illustrated embodiment comprise approximately 60 to 70% of the volume of shaft wall. The filaments may include filaments made of different materials and the different filaments may be selectively uniformly distributed in the annular array in the tubular wall. Alternatively the different material filaments may be arranged in radially related annular arrays. The outer surface of the tubular wall may be formed of the matrix material.
REFERENCES:
patent: 2573361 (1951-10-01), Rodgers, Jr. et al.
patent: 3651188 (1972-03-01), Wolf
Thibodeau Paul J.
Trail Equipment Company, Inc.
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