Acoustics – Sound-modifying means – Intensifying horn
Patent
1991-09-20
1993-01-12
Gellner, Michael L.
Acoustics
Sound-modifying means
Intensifying horn
181184, 181190, 273 72R, 446416, G01K 1100, A63B 5906
Patent
active
051792559
ABSTRACT:
A baseball bat having the functions of resonators and microphones is designed to be hollow and has a receiver cup disposed at its inner top end in such a manner that a spring may be hooked to its bottom while the other end of the spring is hooked to a tuning bar fixed at an end cap fittedly adhered to the bottom end of the bat. Besides, a plurality of sound-amplifying holes are formed on the surface of the bat at proper positions. Whenever the bat is vibrated by external force, the spring inside it shall vibrate accordingly and the sound-wave so produced resonates within the hollow bat which serves as a resonance box. When the sound-wave passes through the sound-amplifying holes on the surface of the bat, a special striking tone shall be produced. Such special tone can be produced either when the bat stikes a ball or when the bat is purposely vibrated or waved. When speaking into the receiver cup, the wave of voice may be amplified through the resonance effect of the hollow bat. No battery is needed in this baseball bat to achieve the above said functions and therefore, no public pollution by waste batteries shall occur due to this bat.
REFERENCES:
patent: 3173688 (1965-03-01), Green
patent: 5127870 (1992-07-01), Lin
Dang Khanh
Gellner Michael L.
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