Basketball goal

Details Basketball goal Basketball goal

1981-09-08

1984-02-07

Shapiro, Paul E.

Metal treatment

Compositions

Heat treating

148 124, 273 15R, C21D 900, A63B 6308

Patent

active

044301308

ABSTRACT:
This invention is a method of producing an improved basketball goal rim including forming a rim from standard sized diameter steel, heat treating the rim to stress relief, harden and temper the same, and allowing said rim to cool. The rim is constructed from hot rolled annealed round rod of high carbon steel in the Class of 4140 containing approximately 0.41 percent carbon, 0.97 percent magnesium, 0.012 percent phosphorous, and 0.022 percent sulphur by volume. The rim is heated to between 1100 and 1350 degrees Fahrenheit for a period of 45 to 75 minutes. The temperature is then increased to between 1400 and 1700 degrees Fahrenheit and maintained at such temperature for 30 to 60 minutes, and then is oil quenched to a temperature between 150 and 175 degrees Fahrenheit for a period of 15 to 25 minutes. Finally the rim is tempered at between 750 and 775 degrees Fahrenheit for a period of 90 to 150 minutes.

REFERENCES:
patent: 2053635 (1936-09-01), Sandeberg
patent: 4040872 (1977-08-01), Mudiare
patent: 4285518 (1981-08-01), Pearo

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