Composite baseball bat having swaged spar and plastic foam cover

Details Composite baseball bat having swaged spar and plastic foam cover Composite baseball bat having swaged spar and plastic foam cover

1985-03-08

1986-02-11

Pinkham, Richard C.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273DIG8, A63B 5906

Patent

active

045695210

ABSTRACT:
A composite baseball bat has a unique tapered aluminum spar encased in polyurethane foam. The tapered spar is formed by swaging, starting with an aluminum tube whose outer diameter and wall thickness are those for the barrel section of the bat. A tapering portion is swaged to a decreasing outer diameter and increasing wall thickness, which is then constant over the handle portion of the bat. This construction yields far greater stiffness and freedom from objectionable vibrations.

REFERENCES:
patent: 2537982 (1951-01-01), Finn
patent: 2857931 (1958-10-01), Lawton
patent: 3479030 (1969-11-01), Merola
patent: 4032143 (1977-06-01), Mueller et al.
3M Company Bulletin: "Scotch-Clad Fuel Resistant Coating No. 776", St. Paul, Minn., 3M Company, Adhesives, Coatings and Sealers Division, Oct. 1, 1966, 2 pages.
3M Company Bulletin: "Scotch-Grip Industrial Adhesive 847", St. Paul, Minn., 3M Company, Adhesives, Coatings and Sealers Division, Revised Oct. 1, 1976, 3 pages.

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