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Патент USA US2411005

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Nov. 12, 1946.
R. SCHULZE
2,411,005
ESCAPEMENT ACTION FOR GRAND PIANOS
Filed April '7, 1945
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Patented Nov. 12, 1946
2,411,005
UNITED STATES PATENT OFFICE
2,411,005
ESCAPEMENT ACTION FOR GRAND PIANOS
1
Reinhard Schulze, Baltimore, Md.
Application April 7, 1945, Serial No. 587,091
4 Claims. (or. s4_2s9)
2
This invention relates to an improvement in
the escapement action of a grand piano and re
lates speci?cally to means to lighten the touch re
quired on the piano keys.
'
The hammer and stem of the escapement ac
tion of the grand piano can be reduced in weight
to a certain extent, but beyond that extent it
cannot be reduced further to give the proper tone
on the piano strings. The hammer stem, carry
ing the hammer, is pivoted at its ?xed end and
the knuckle on that stem is removed from that
3
oted at 3’ to the free end of the repetition lever.
Jack 8 is held forward against stop 9 by spring
ID in upright 6. Repetition lever 'l is held down,
= with its regulating button H resting against the
pad H’ on the pivoted end of wippen 5. The
upward movement of the lower end of the repe
pivot about 1A; of the length of the stem. The
weight of the hammer that must be therefore
moved by the keys is about 8 times the actual
tition lever is limited by check l2 and the lever
is held in the position shown by spring 1 3 passing
through loop l4 fast in the wippen 5. Tension
of the spring i3 is adjusted by screw 15. Rail 16
has hammer flange l'l fast thereto. To this
?ange hammer stem lBis pivoted at It’ and the
stem is has hammer l9 at its free end. Rest rail
hammer weight because of this leverage.
Before repetition levers were used, it was pro
posed to place a spring on the hammer stem to
lessen the weight of the hammer so that it would
not fall so rapidly and so that a note could be re
peated without having the hammer fall all the
way down to its rest.’ Similarly even'since repe
tition levers have been used, it has been proposed
Y
20 20 is padded at 20' as shown and the other parts
are padded likewise as shown and as is usual
in the construction of these actions.
The hammer stem has a padded knuckle 2i
hammer weight and consequently lighten the pi
ano key touch. Springs heretofore designed have to Cl thereon against which the head of the jack 3
strikes in sounding a note. A ?llet 22 holds the
lacked utility partly because of their rigidity‘ and
knuckle 2! on the stem l8 and the distance be
partly because of their unadjustability. This un
tween the pivot point of the stem and the ?llet
adjustability of the spring tension on the in
is about 1/8 of the total length of the stem. A
stalled piano made it substantially impossible to
properlyv adjust the piano action if once it got .70 loop cord 23 has its free ends glued fast in-the
?llet as shown, in Figures 3' and 4. The cord
out of adjustment;
passes through opening 24 in the stem. The
The spring of the present invention not only
stem also has opening 25 therein on the other
allows for the complete adjustability of the ten
side of the knuckle, toward the hammer. A coil
sion of that spring, including the actual meas
spring 26 is pivoted on padded pivot 27 and is
to place a spring on a hammer to lighten the
urement of that tension, but it allows also for its
complete inaction when the other parts of the
piano action are to be adjusted. It is so made
and positioned as to substantially disappear when
other adjustments are required on the piano ac
tion.
Other objects and advantages of the invention
will be apparent from the following description
and the accompanying drawing forming a part
hereof and in which:
Figure 1 is a fragmentary side elevation of a
grand piano escapement action.
Figure 2 is a fragmentary plan View of the ham
mer stem and its mounting.
Figure 3 is a sectional view on line 3—3 of Fig
23 Cl
‘
ilar parts throughout the several views. The pi
ano key I has the usual capstan 2 and backcheck
3 thereon.
Rail 4 has flange ‘4' wippen 5 pivoted thereon
at .5’. And wippen 5 has upright 6 with repeti
tion lever ‘I pivoted thereon at 7’. Jack 8 is piv
counter-sunk in opening 28 in ?ange l1. One
free end of this coil spring 26 is held by screw ~29
which may be moved up or down to adjust the
tension exerted by the spring. The other end, 33,
of the spring 25 has thereon a hook 3i passing
through the loop of cord 23. The tension of the
spring as imparted to the stem I8 is directly over
the center of the knuckle and in proportion to
the tension on the spring lessens the weight of
the hammer upon its initial rising. It is impor
" tant that the tension on the spring be substan
tially negligible at the time the hammer strikes
the string, so that the hammer will obtain suffi
cient momentum in its fall to push down the
repetition lever against the action of its spring
ure 1.
50 [3, so that the backcheck 3 will be able to func
Figure 4 is a perspective view of the hammer
tion against the lower end of the hammer [9 to
knuckle showing the cord loop attached thereto.
check the hammer to make possible the rapid
Figure 5 is a fragmentary side elevation show
repetition
of a note. The opening 24 is shaped
ing the hammer stem folded back.
to allow the free movement of the cord 23 there
In the drawing similar numerals refer to sim
in without contact at any time.
2,411,005
3
When it is desired to raise the stem l8 on its
pivot, as shown in Figure 5, the end 30 of the
spring with its hook 3| slides into opening 25
in the stem and the hook 3| slides off the loop
of cord 23 as shown in Figure 5. This construc
tion allows for raising the stem as shown in Fig
ure 5 without increasing the tension on the
spring 26 or otherwise injuring it in any manner.
knuckle, to exert a lifting action on the hammer
stem.
2. A grand piano action comprising a hammer
rail having a hammer ?ange ?xed thereon, a
Cl hammer stem with a hammer thereon, the stem
being pivoted to said ?ange, a knuckle on the
underside of said stem near the pivoted end
thereof, a pivot extending transversely of said
?ange, a piece of resilient wire having its inter
The hook 3| resumes its proper position in the
mediate portion coiled about said pivot, said wire
loop 23 simply by lowering the hammer stem 18 10 having one end secured to said ?ange and the
to its proper position as shown in Figure 1. It is
often important to raise the hammer stem to
adjust the tension on spring l3 or to change the
position of the button I l or to take out the whole
wippen 5 and its attached parts. The construc
tion of the spring and its attachment to the ham-.
mer ?ange and stem makes possible the substan
tial disappearance or elimination of the spring
when the stern must be raised for these pur
poses.
a
It‘ will be apparent that a lighter hammer on
the initial blow, as is provided by the use of this
spring, will make possible a lesser tension on the
repetition lever spring 13; A lighter hammer will
other end secured to said stem adjacent the
knuckle, to exert a lifting action on the hammer
stem, said stem having a vertical opening there
through adjacent the knuckle and toward the
hammer, the end of the wire secured to the stem
passing freely into the opening upon the eleva
tion of the stem.
3. A grand piano action comprising a ham
mer rail having a hammer ?ange ?xed thereon,
a hammer stem with a hammer thereon, the stem
being pivoted to said ?ange, a knuckle on the
underside of said stem'nea'r the pivoted end
thereof, a coil spring transversely and horizon
tally pivoted in said ?ange, said stem having a
also obviate the necessity of so much weight at
vertical opening therethrough adjacent said
the ?ngering end of the keys I. The amount of
knuckle toward the pivoted end of the stem, a
tension on the spring 26 is substantially trebled
cord loop extending through said opening ?xed
in the lighter touch required on the key because
adjacent said knuckle, said spring having one
of the lesser tension allowed on the repetition
end passingover the stem and through said loop,
30
lever spring i3 and the lighter weight in the
and the other end being adjustably held on the
said ?ange, whereby the spring‘ tension may be
keys I.
By this invention a most sensitive touch only
varied, to impart a lifting action to the hammer
is required upon the key to produce a note of
stem.
4. A grand piano action comprising a ham
the same ?rmness and resonance as heretofore 35
mer rail having a hammer ?ange thereon, a
produced by a much heavier touch and the re
petition of a note becomes far more easy and
sensitive because of the spring.
hammer, a stem supporting the hammer and
being pivoted to the ?ange, a knuckle‘ on the
underside of the stem near the pivoted end there
What is" claimed as new and is desired to be
40 of, said stem having two vertical openings there;
secured by Letters Patent is:
through adjacent the knuckle, one toward the
1. A grand piano action comprising a hammer
pivoted end, the other toward the hammer, a
rail having a hammer ?ange ?xed thereon, a
piece
of resilient wire having an intermediate
hammer stem with a hammer thereon, the stem
portion wound into a coil pivoted transversely‘ of
being pivoted to said ?ange, a knuckle on the
underside of said stem. near the pivoted end 41. said ?ange, one end of said wire being secured
to the ?ange and the other end being secured‘to
thereof, a pivot extending‘ transversely of said
a, loop passing through the stem opening toward
?ange, a piece of resilient wire having its inter
the stem pivoted end, and passing into the other
mediate portion coiled about said pivot, said wire
opening upon the elevation of the stem.
having‘ one end secured to said ?ange and the
REINHARD SCHULZE.
‘other end secured to said stem adjacent the
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