Games using tangible projectile – Bowling – Pin
Patent
1996-08-26
1997-07-29
Pierce, William M.
Games using tangible projectile
Bowling
Pin
473120, 473564, 264 41, 26432816, 264DIG13, 264DIG77, 249111, A63B 5906
Patent
active
056517408
ABSTRACT:
An elongated member, for example, a bowling pin, has a core of foamed plastic material, which has areas of greater density, generally toward the lower end of the bowling pin, so as to provide desired weight distribution along the member. In the bowling pin, providing a denser core area near the bottom lowers the center of gravity. In a baseball bat, the increased density can be provided in the "sweet spot" area, if desired.
In producing the variation in density, the mold in which the foamed core is formed is heated in those areas in which the density is to be light and chilled in those areas in which the density is to be increased.
In making a baseball or softball bat, a foamed core can be wrapped directly with graphite filament or graphite and glass filaments, or synthetic fibers such as Aramid fibers of the type marketed by Dupont de Nemours as KEVLAR.RTM. either dry wrapped and subsequently embedded in epoxy or the like, or wrapped with adhesive coated fiber that is then cured.
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patent: 3240646 (1966-03-01), Smith
patent: 3265401 (1966-08-01), Spier
patent: 3478134 (1969-11-01), Gruss et al.
patent: 4340226 (1982-07-01), Haines
patent: 4548773 (1985-10-01), Suh et al.
patent: 4746117 (1988-05-01), Noble et al.
patent: 4848745 (1989-07-01), Bohannan et al.
patent: 5185914 (1993-02-01), Petruccelli et al.
patent: 5266259 (1993-11-01), Harrison et al.
patent: 5354239 (1994-10-01), Mueller
Article from the Modern Plastics Mid-October Encyclopedia Issue entitled Fibrous Reinforcements pp. 237-246.
Article from the Design Guide for Advanced Composites Application entitled Designing Structural Tubes pp. 40-41.
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