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US 5,203,560 AGranted
Production of a sound-producing PU-ball
OwnerShyr-Yuh Wanginventor
Life of this patent
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Abstract
The production of a sound-producing polyurethane foamed ball is disclosed in which the sound producing hardware having a sound generating circuit connected to a battery set by a spring switch, is placed in a mold for producing a polyurethane foam ball in which the polyurethane covers the sound generator through a foaming process. The sound generating hardware is supported in the mold by a metal column extending into the mold cavity. The polyurethane ball thus made has an elongated sound hole for transmitting sounds from said sound generator to the outside.
Claims2
A method of making a sound producing polyurethane ball in a mold comprising the steps of:
- a) extending a rod member from the mold into a mold cavity,
- b) removably supporting a sound generator on the rod member such that the sound generator is out of contact with the mold, said sound generator having a music integrated circuit, a speaker, a spring, and a battery set mounted thereon,
- c) placing a foamable polyurethane material into the mold cavity and causing the polyurethane material to undergo a foaming process such that the polyurethane material encloses the sound generator;
- and,
- d) removing the ball from the mold and withdrawing the rod member from the ball so as to leave a passage extending through the ball to the sound generator.
2 more elements
Dependencies are inferred from the claim text.