Automatic player piano
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 17, 1989
Grant Date -
N/A
app pub date -
May 17, 1988
filing date -
May 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic player piano comprises (a) a keyboard provided with a plurality of keys each having a front end portion, an intermediate portion and a rear end portion, the front end portion being pressed by a player for requesting a sound, (b) a key supporting unit provided on a key bed and having a front rail capable of engagement with the front end portion, a back rail capable of engagement with the rear end portion and a balance rail provided between the front rail and the back rail and rockably supporting the intermediate portion, (c) a sound producing mechanism associated with each of the keys and operative to produce the sound, (d) a plurality of key action mechanisms each engagable with the rear end portion of each key and operative to transfer a motion of the key to the sound producing mechanism, and (e) a plurality of key actuator units each provided between the front and balance rails of the key supporting unit and operative to pull down each of the keys for requesting a sound upon activation thereof. The hollow space between the front rail and the balance rail is substantially equal over various piano, so that a common key actuator unit assembly may be incorporated in the automatic player piano of different models.
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