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Патент USA US3076381

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Feb. 5, 1963
c. w. ANDERSEN
3,076,371
KEYFORK ARRANGEMENT
Filed June 2o. 1961
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United States
atent
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CC
3,076,371
Patented Feb. 5, 1.963
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Referring now in detail to the drawing, especially to
FIG. l, a keyfork indicated generally by the numeral
3,076,371
. .
Clifford W. Andersen, De Kalb, lil., assignor to The
Wurlitzer Company, Chicago, Ill., a corporation of
KEYFORK ARRANGEMENT
Ohio
it) will be seen rigidly mounted to the rear end of a
conventional piano key lever 12. The keyfork it) in
5 cludes a tongue portion 14 which is driven directly into
Filed June 20, 1961, Ser. No. 118,341
6 Claims. (Cl. Sli-240)
y
'
the end of the key lever 12, preferably at a slight angle,
the tongue 14 being advantageously coated with rosin in
order to achieve better attachment.
rthis invention relates generally to pianos and more
In accordance With conventional practice, the piano
particularly to arrangements for connecting a piano ac
10 key lever 12 is arranged for rockable movement by be
tion to its operating key.
ing fulcrumed on a balance rail pin to pivot about a
In the past, individual piano actions .have been con
balance rail. In further accord with conventional prac
nected to their respective operating keys in compliance
tice, manual depression of the outer end of key lever 12
with a variety of schemes. The connections in drop
is
arranged to result in the striking of a corresponding
type actions have been commonly made, for example,
piano string through a piano action; and in order to re
by providing a lbore in the rear of the key. After the
ceive the key lever motion, the piano action includes an
'free end of a lifter rod has been passed through this
abstract, sticker or lifter rod 16. The abstract 16 is
bore, a nut or similar element is secured to the end of
pivotally connected to the operating elements of the
the rod over the top of the key. More recently, this
scheme has been supplanted by assembling a fork to the 20 piano action at one end and is coupled to the piano key
lever 12 at the other end by means of the keyfork 10
end of a key and by securing a rubber gromrnet to the
and a connecting element 18 taking the form of a rubber
end of the lifter rod, the rod being releasably secured
grommet.
to the key by inserting the grommet in a keyhole-shaped
The abstract 16 includes a wooden rod 2i) and a Screw
notch opening from the end of the fork. This arrange
element 22 which threadedly engages the free end of rod
ment, while affording a certain facility in assembly and
2i). The element 22 comprises a threaded tip 24 for en
disassembly of the lifter rod and'the key, has proved
tering
an axial hole bored in the _rod 2o or for direct,
susceptible of incurring objectionable play or looseness
progressive engagement With the rod. Screw element 22
in the voverall connection.
l
'
is also provided with a slotted head 26 and a grip-assist
Therefore, an important object of the present inven
ing
formation 28. In accordance with an important fea
tion is to provide an arrangement which positively inter 30
ture of the invention, the formation 2S takes the form
connects a piano action?lift'er rod and its operating key.
A more general object of the invention is to provide 'f of a diamond-patterned knurl extending an appreciable
distance along the shank of element 22 and into close
a new and improved connection for a piano action and
its operating key lever.
`
proximity with the head 26. A portion of the forma
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Another object of the invention is to provide a key 35 tion 28 is particularly disposed in radial alignment with
a central, constricted portion of the element 18, which
fork arrangement that ensures positive transmission of
constricted portion defines an endless circumferential
key lever motion to a cooperating piano action.
groove 30.
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�
籄dditional objects and features of the invention per
'
As
is
shown
in
FIGS.
2
and
3,
the
keyfork
10 includes
tain to the particular structure and arrangements where
40 a pair of tines 32 which are spaced apart in parallel rela
by the above objects are attained.
'
A structure in accord with the invention includes a 'l tionship to define a straight-sided slot 33 for receiving
the element 18 at the groove 30 thereof. The connecting
key lever arrangedrfor rockable movement; an endwise
reciprocable link having a grip-assisting formation adja
element 18 is advantageously fashioned from a suitable,
tough, elastomeric material; and when the element 1S is
cent one end; a connecting element on the `link adjacent
the rear end of lthe key lever, the connecting _element
having a constricted portion situated transversely of the
link in radial alignment with a portion 玱f the grip-assist
ing formation;` a-fork rigid with and projecting 4rear
wardly from the key lever including tines spaced apart
45
so fabricated, the tines 32 can be spaced apart by a dis
tance somewhat less than the normal root diameter ofthe
groove 30. So arranged, the tines 32 compress the con
stricted` portion of the connecting element into gripping
engagement with the formation 28 which is disposed
to define a stright-sided slot for receiving the constricted 50 in the central vertical bore of the connecting element
in radial alignment with the circumferential groove 30.
portion of the connecting element, the' tines compressing
This arrangement e馿ctively restrains the connecting eie
the constricted portion into gripping engagement with the
ment against longitudinal movement relative the abstract
grip-assisting formation; and tip means on each of the
16 for positively transmitting key lever motion to the
tines for restraining the connecting element against move
piano action. While the head 26 cooperates in this
ment in the plane of the fork in a direction away from
function, the principal purpose of the head 26 in the
the end of the key lever.
present arrangement is to provide means for readily regu
The invention, both to its structure and mode of opera
lating the position of the connecting element 18 relative
tion, Will be better understood by reference to the follow
to the free end of the wooden rod 2o.
ing disclosure and drawing forming la part thereof, where
Returning to FIG. 2, the straight-sided slot 33 will be
1n:
60
FIG. l is a perspective view of a keyfork arrange
ment constructed in accordance with the invention;
FIG. 2 is an enlarged plan view of a keyfork blank
shown prior to ultimate formation of the tips of the tines;
seen fashioned with a curved bottom or end 34; and this
end 34 is adapted to mesh with the 駉or of groove 30
for restraining the connecting element 18 against move
Iment in the plane of the keyfork in a direction toward
FIG. 3 is a view of the keyfork of FIG. 2 after com 65 the end of the key lever 12. In compliance with an im
portant feature of the invention, means are also provided
pletion and showing the keyfork receiving and retaining
for restraining movement of the connecting element in
a connecting, nubber grommet;
the opposite direction. Specifically, the tines 32 are
FIG. 4 is a front elevational view of the arrangement
provided with enlarged tip portions 36 which are right
of FIG. 3; and
angularly formed as is shown in FIG. 3. Thus, the tines
7
O
FIG. 5 is an enlarged view taken through the section
are provided with tips of greater dimension transversely
5-5 of FIG. 3.
of the principal plane of the keyfork than either the body
3,076,371
lever, said element having a 玞onstricted portion situated
of the tines or _the constricted portion of the connecting
In assembling the connecting element 1S to the key
transversely of said link in radial alignment with a por
tion of said formation; a fork rigid with and projecting
fork, the resilient nature of the materialfrom which the
apart to define a straight-*sided _slot for receiving said con
element.
rearwardly from said key lever including tines spaced
element is fabricated permitsdistortion of the sidewalls
stricted portion, said tines compressing said constricted
portion intogripping engagement with said formation;
0f ,groove 30 a1lowins passage 0f the enlarged tips� 36
In the course of normal use, forces Sufficient to distort
the connecting element 18 are not encountered. Ao
and tip means on each of said tines of_greater dimension
transversely of the principal plane of said .fork than
either said tines or said constricted portion for restraining
said element against movement in the plane of said fork
in a direction away Yfrom the end of -said key lever.
cordingly, the right angularly for-med tips 36 restrain
the connecting _element 18 against movement in the plane
of the keyfork 10 in a direction away from the end of
the key lever 12. Positive transmission of key lever
motion to the cooperating piano action is thus ensured.
It is to be recognized that the keyfork 1?) is provided
with two planes of substantial symmetry. One plane
4. In a piano, the combination comprising; a key lever
arranged for rockable movement; an endwise recipro
cable link having a grip-assisting formation adjacent one
end; a connecting element of tough, elastomeric material
y of actual symmetry bisects the slot 33 at right angles to
the plane lof tongue 14, and one plane of substantial
symmetry is disposed generally coplanarly with the tongue
14 and the principal portions of the ktines 32.. This
symmetrical arrangement of the keyfork 10 facilitates
handling of numbers of thekeyforks in assembly and
precludes the problem of properly orienting each key~
fork in automatic feed equipment.
The tip portions 36 are fashioned withflattened ends
38 as shown in PIG. 2. The fairly considerable surfaces
aiforded by these flattened ends provides purchase for
facilitating the driving of the keyfork into� the end of
the piano key lever.
'
on said link adjacent the rear Yend of said key lever, said
element having a constricted portion defining an endless
20
circumferential groove situated Atransversely of said link
in radial alignment with a portion of said formation; and
a .fork rigid with .and projecting rearwardly from said
key lever including tines spaced apart to deline a straight
sided >slot -for coupling to said element at lsaid groove,
said tines compressing said constricted portion into grip
ping engagement with said formation, said tines having
right angularly rformed tipportions extending beyond
said element 玜nd havinggreater height than the width
of said groove for restraining said connecting element
While a particular embodimentof the. invention has 30 against movement in the plane of saidgroovein ak direc
tion away from the end of said> key lever;
been showr1,_it is to` be understood, of course, that the
invention is not limited thereto >since many modi馽a.
5. In a piano, the combination 籥ccording to claim#
wherein said grip-assisting formation. comprisesr al dia
tions may be made. It is, therefore, contemplated to
mond-patterned knurl.
'
,
cover by the appended claims any such modifications as
6. `In a piano, the combination comprising: a` key lever
fall within the tnue spirit and scope ,of the; invention.
35
arranged for rockable movement;` an endwise recipro~
The invention` is claimed as follows:
cable. link having a grip-assisting formation adjacent one
1. In a piano,y the combination comprising: a key lever
end; a connecting element on saidlinkadjacent the rear
arranged for rockable> movement;` an endwise reciprocable
end of said key lever, said element having a constricted
link- having a grip-assisting formation adjacent one end;
a connecting element on said link adjacent the rear endof 40 portion situated transversely of said link in` radial align
ment with a portion of said formation; and .a fork rigid
said key lever, said element having a constricted. portion
with and projecting rearwardly from said key lever
situated; transverselyy of. said link inradial alignment
including tines spaced apart to receive-籹aidV constricted
with a. portion ofsaid formationaal fork` rigid: with*I and
portion, said tines compressing vsaid constrictedv portion
projecting rearwardly from .- said .key leverincluding tines
into gripping engagement with said formation.
spaced apart to receive said constricted portion, said
tines compressing; said constricted portion into` gripping
engagement with said' formation; and tip means onveach
of said, tines for .restraining'said element against move�
ment in- the. planeof� saldi forkr in.` a ldirection away from
Re頴rencesCited in the tile of `this patent
UNtTEDl STATES PATENTS
said key lever.
2.- In a piano, the:combinationvaccording- to claim 玪
wherein-- saidv grip~assisting formation comprises afdia
mondfpatterned knurl.v
3.~ Ina piano, thecombination comprising: a key lever
arranged for rockablev movement; anendwise recipro~
cable link- having a gripfassisting formation adjacent
one end; a connecting Yclement of tough,- elastomeric
material on; said link adjacent: theirear end of said key
FOREIGN PATENTS
354,778
i
VGreat `Britain ________ _, Augl 4, 1931v
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