Voice scribe
OwnerEdward A. Mullerinventor
Life of this patent
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Abstract
A power-driven voicing tool simultaneously inserts into and withdraws from the felt of a piano hammer, needles to raise a nap thereon. A row of four needles is driven by two circularly moved cam surfaces on the ends of an assembly rotatable by a variable speed electric motor through a flexible drive cable. One cam surface lies outside the other and drives the external needles of the row of needles; the other drives the internal needles. The slopes of the two cam surfaces are different and one-hundred-and eighty degrees out-of-phase with each other and effect different movements in adjacent needles, one needle moving outward while the other moves inward. A process of inserting a needle while withdrawing an adjacent needle in the felt of the piano hammer, is practiced.
Claims10
A voicing tool comprising at least four needles arranged in sets in a row, the movement of adjacent needles being one hundred and eighty degrees out of phase, one of said needles being advanced while another of said needles is being retracted from the wool end of a piano hammer.
A power-driven voicing tool comprising an elongated housing, a power-driven element on said housing, needles projecting from one end of said housing for penetrating wool on piano hammers, and means connecting said power-driven element with said needles to advance one of said needles while an adjacent one of said needles is being retracted, said means including an element rotated about the axis of said housing and being driven by said power-driven element.
Dependencies are inferred from the claim text.