Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1978-06-16
1979-03-06
Marlo, George J.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 1M, 273DIG7, 264239, A63B 3702
Patent
active
041427203
ABSTRACT:
A billiard ball having magnetically attractable characteristics such that it may be utilized on pool tables where separation of a scratched cue ball from the object balls is accomplished by use of a magnet. The ball has a spherical core of non-magnetic cured resinous material, selected from the group of polyester, epoxy, polyurethane and phenolic resins; the diameter of said ball is 21/8-21/4 inches and its weight is within the range of about 142 to 190 grams. Distributed within the core are magnetically attractable particles which are dispersed with such uniformity that the ball's anisotropy factor is not more than about 10 percent as the ball rotates about any of its axes. The preferred magnetically attractable material constitutes iron particles having a maximum size of about 0.020 inch, and ideally no larger than about -325 mesh. Another magnetically attractable filler is barium ferrite. The filler is positioned in such a way that a magnet in a table made in accordance with U.S. Pat. No. 3,362,710 (having a flux density of about 1000 gauss on its face) will attract the ball with a preferred minimum force of about 35% of the ball's weight, e.g., about 65 grams. To increase the attractive force of a magnet on a ball without increasing its weight, the particles of metallic filler may be concentrated in a spherical band near the surface of the ball. Also disclosed is a technique for casting resinous spheres in which a core is centered within a mold cavity using a plurality of small fiberglass-reinforced rods having a diameter on the order of 0.040 inch. Using such rods, a cover of polyester or the like having a thickness of about 1/8 inch may be readily cast over the core--without introducing any problem of moving the ball's center of gravity away from its geometric center.
REFERENCES:
patent: 2219074 (1940-10-01), Guillou
patent: 2655195 (1953-10-01), Curtis
patent: 3738655 (1973-06-01), Feddick et al.
patent: 3891221 (1975-06-01), Gordon
Marlo George J.
McHugh Charles W.
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