IMPROVEMENTS IN ACTIONS FOR PIANOFORTES AND SIMILAR INSTRUMENTS
Year: 1883

page_text: LETTERS PATENT to Edwin Ambrose Brydges of the firm of Brydges & Co,
Engineers and Patent Solicitors, of 107 Koniggrätzer Str. in the City of
Berlin and German Empire for an Invention of "IMPROVEMENTS IN ACTIONS
FOR PIANOFORTES AND SIMILAR INSTRUMENTS" communicated to him by
Adolf, Lexow of the City of Berlin and German Empire aforesaid
PROVISIONAL SPECIFICATION left by the said Edwin Ambrose Brydges
at the Office of the Commissioners of Patents on the 13th August 1883.
"
EDWIN AMBROSE BRYDGES of the firm of Brydges & C° Engineers and Patent
Solicitors of 107 Königgrätzer Str: in the City of Berlin and German Empire
IMPROVEMENTS IN ACTIONS FOR PIANOFORTES AND SIMILAR INSTRUMENTS & com-
munication to me by Adolf Lexow of the City of Berlin and German Empire
aforesaid.
My invention relates to improvements in actions for Pianofortes and similar
instruments The object of my said invention is to render the pressure of the
releasing action imperceptable and to secure a ready and precise releasing move-
ment by employing an arm or releasing arrangement which said arm is provided
with a suitable inclined surface.
According to my said invention the said arm or releasing arrangement is attached
to the jack or hopper near the fulcrum of the same.
The releasing of the jack or hopper by means of suitable button and screw takes
place as soon as the hopper lever takes up a horizontal position.
·
The inclined surface to the releasing arın glides on the button or stop and
produces a gradual releasing of the jack or hopper.
The releasing or stop wire is in this arrangement passed through the arm with
the inclined surface into the jack or hopper in order to further strengthen the said
releasing arm.
By means of this arrangement an increased durability of the dog rail is
attained.

page_text: "
EDWIN AMBROSE BRYDGES of the firm of Brydges & Co. Engineers and Patent
Solicitors of 107 Königgrätzer Str: in the City of Berlin and German Empire 5
IMPROVEMENTS IN ACTIONS FOR PIANOFORTES AND SIMILAR INSTRUMENTS a com-
munication to me by Adolf Lexow of the City of Berlin and German Empire
aforesaid
My Invention relates to improvements in actions for Pianofortes and similar
instruments, the object of which is to render the pressure of the escapement 1
imperceptible and to secure a ready and precise escapement without the use of a
connecting piece under the fulcrum of the jack or hopper by employing an escape-
ment stud provided with a suitable inclined surface
Figure 1 shows the piano mechanism in vertical section and
Figure 2 is a modification of the same
According to my invention the escapement stud or puppet a is attached to the
jack or hopper b near the fulcrum c of the same (as shown in Fig: 1) or beneath
the fulcrum of the said jack or hopper b (as shown in Fig: 2.)
1
The releasing or escapement of the jack or hopper by means of the button or
stop and screw e takes place as soon as the lever f takes up a horizontal 2
position
The inclined surface a¹ of the escapement arm a glides on the button or
puppet & and thereby produces a gradual escapement or releasing of the jack or
hopper b-The wire g is bent and passes in the arrangement shown in Fig: 1,
through the jack or hopper b as well as through the escapement arm a which is
provided with the inclined surface a' in order to further strengthen the said
arm a
The arrangement of the escapement arm near or beneath the fulcrum c of the
jack or hopper b has the advantage over all previous constructions, of imparting an
increased durability to the so called dog-rail h
partial
Another great advantage of the arrangement shown in Fig: 2 is that the jack or
hopper b, contrary to all other escapements is. simply caused to make a
revolution instead of being pushed or forced out of its position
By means of this arrangement not only the pivot or fulcrum c is greatly
protected but also an absolutely imperceptible escapement of the jack or hopper b
ensues whereby an extraordinarily. precise and easy working of the action is
attained
Having now described my said invention what I claim and desire to secure by
Letters Patent is :-
In actions for Pianofortes and similar instruments :—
The construction arrangement and employment of the escapement arm a with
the inclined surface a' attached to the jack or hopper bin such manner that the
fulcrum c of the latter lays near (as in Fig: 1) or over the inclined surface a' (as
in Fig 2) and whereby an absolutely imperceptible, easy and precise escapement
1

page_text: or releasing of the jack or hopper b is attained by means of the button or puppet d
as soon as the lever f is in a horizontal position substantially as described and
shown in the accompanying drawings
In witness whereof I the said Edwin Ambrose Brydges have hereunto set my
band and seal this seventh day of February in the year of Our Lord One thousand
eight hundred and eight four
Witnesses :-
ARTHUR BAERMANN.
ANTHONY STEFFEN
EDWIN A BRYDGES (L.S.)