Year: 1888

page_text: I, FRANZ PETERMANN of No. 43 Dresdener Strasse in the City of Berlin, Germany,
Piano Manufacturer, do hereby declare the nature of my said invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:
:-
My invention relates to improvements in pianoforte actions, the object of which is
to secure the perfect repetition of the action.
Very many systems of repeating actions are known, but even the best are not
absolutely certain or if rendered as perfect as possible according to the system, they
are too complicated, too expensive and too liable to get out of order.
Now the object of my invention is to produce a simple, compact, cheap, durable and
absolutely certain repeating action for pianofortes or other similar instruments.
The accompanying drawing represents an elevation of my improved repeating
action.
The chief object of my present invention is to bring the hopper or jack b.back again
onto the offset c' of the rocking lever c with the greatest possible rapidity after the
key has been struck and consequently produce a rapid escapement or releasing of the
hammer a so that an absolutely perfect repetition is attained even after the slightest
pressure of the finger on the key.
This I attain in most perfect manner by the arm or tongue f, which is, at its upper
end, pivotted to the tumbler a¹ of the hammer a in such manner that when the hammer
falls to the rear after striking the strings the jack or hopper will be immediately
lifted onto the offset e¹ through the inclined surface of the pendant arm or tongue f.
When the hammer a falls to the rear through the rotary movement of the tumbler a
the arm or tongue flays itself against the inclined surface of the hammer rail e and
exercises a counter-action on the puppet d' thus enabling the movement of the
hammer a to be adjusted. The return movement of the jack or hopper bis facilitated
by the spring i which at the same time serves to bring back the hammer a.
The adjustable puppet d' serves to regulate the movement of the hammer a and the
fall of the jack or hopper b in the recess c' of the lever c.
By employing the arm or tongue f the jack or hopper 6 is enabled to take up a

page_text: vertical position whereby I attain the easy play of the action and cause the jack or
hopper to move parallel to the hammer rail e so that the hammer movement is
readily arrested. The adjustable puppet & releases the jack or hopper b as customary
in repeating actions and assists at the same time the arresting of the hammer a after
the strings have been struck by the same by means of the incline & on the hopper or
jack b.
By employing my improved action the catches and counter catches usually
employed in pianoforte actions are rendered unnecessary and an absolutely perfect
repetition assured in the simplest possible manner.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is:
In repeating actions for pianofortes the use of the tongue or arm pendantly
attached to the tumbler a¹ of the hammer a between the puppet and the inclined
surface of the hammer rail e, substantially as and for the purpose set forth in the
foregoing specification and shown in the accompanying drawing.
л
1000
W. P. THOMPSON & BOULT,
Agents.