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Патент USA US3051808

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Aug. 28, 1962
w. PAUL ETAL
3,051,799
KEYBOARD FOR USE IN SIGNALLING SYSTEMS
Filed April 8, 1958
2 Sheets-Sheet 1
Aug- 28, 1962
w. PAUL ETAL
3,051,799
KEYBOARD FOR USE IN SIGNALLING SYSTEMS
Filed April 8, 1958
2 Sheets-Sheet 2
United States Patent O?fice
1
ensues
Patented Aug. 28, 1962
2
for the interior wiring, are in this manner eliminated.
3,051,799
The number of parts required is reduced, thereby facilitat
KEYBOARD FOR USE IN SIGNALLING SYSTEMS
Walter Paul, Albert Geese, Franz Gaber, and Hans
ing disposal of the contact spring banks in small housings,
which until now occasioned great difficulties, for example,
in connection with key selectors built into subscriber
stations.
poration of Germany
The inten'or wiring of the contact spring banks, espe
Filed Apr. 8, 1958, Ser. No. 727,222
cially in the case of key selectors, may also include con
Claims priority, application Germany Apr. 17, 1957
nections between contact springs associated with different
8 Claims. (Cl. 200-5)
10 keys. In accordance with the invention, the webs inter
This invention is concerned with a keyboard device for
connecting the contact spring elements may be constructed
use in signalling systems, especially telephone systems,
and arranged so as to produce web grids between contact
Greska, all of Munich, Germany, assignors to Siemens
& Halske Aktiengesellschaft, Berlin and Munich, a cor
comprising a plurality of individually operable key de
springs which provide for the desired interconnections.
vices forming an operating unit.
These web grids impart to the corresponding punched
The general object of the invention is to provide an 15 contact layers great mechanical strength, thus avoiding
improved construction of such a keyboard device so as
di?iculties in the production, handling and assembling
to simplify the electrical and mechanical assembly opera
thereof, despite the relatively large area covered thereby
tions as well as the adjustment operations and further, to
along which the contact spring sets are distributed two
reduce the space requirements.
dimensionally.
There are keyboard devices known having contact 20
Further compact disposal of the parts may be obtained
spring banks composed of strips or bars consisting of a
by placing the contact springs of the multiple so as to
contact frame and surmounted by a mounting frame.
extend alternately in opposite directions. The terminal
The mounting frame serves for the joumalling of the keys
ends of the contact springs which extend in identical di
and carries mechanical control members, the contact
rection are thereby interconnected by means of a web and
spring sets being placed in the contact frame, and the 25 these webs are interconnected by means of a transverse
plungers of the keys extending through both frames.
web extending preferably ‘between and in parallel with
These constructions were intended to facilitate the assem
the contact springs. These webs give the possibility for
bly of the key bars as well as accessibility thereto and also
many different interior wiring schemes and permit reduc
to facilitate the exchangeability of the contact spring sets.
tion of the number of terminal wires for the key banks,
However, since the contact spring sets are individually 30 for example, in the case of a key selector, to reduce the
secured in place by means of special mounting elements,
number of terminal wires to that involved in a dial.
a great number of individual parts is required in these
The construction of the contact spring banks according
known structures, and the adjustment of the contact
to the invention also facilitates the disposal thereof within
springs with respect to their mutually cooperating posi
a housing. In case of a keyboard comprising a plurality
tions is rendered dit?cult.
The interconnection of in
35 of keys, an arrangement in two parts which facilitates
dividual contact spring sets, whenever necessary, requires
wiring material and corresponding soldering as well as
testing operations. These disadvantages become partic
ularly noticeable in the case of contact spring banks in
accessibility and exchangeability, may be particularly
advantageously utilized. In such arrangement, the con
tact spring multiples are disposed within a downwardly
open space formed by a ?rst bridge-like mounting plate
made of insulating material, such mounting plate being
surmounted by a second mounting plate preferably like
wise made of insulating material, further contact spring
housings and containing involved interior wiring.
sets being disposed within the space extending between
It is known from multipled contact banks of switches, 45 the top side of the ?rst mounting plate and the bottom
such as selector switches, to punch contact elements layer
side of the second mounting plate, and vertically aligned
openings being formed in such mounting plates for receiv
wise from an integral metal sheet. Such elements, being
ing and guiding the key plungers extending downwardly
interconnected by webs, are assembled in layers, the webs
which several such key bars are combined to form a unit,
for example, in the case of a key transmitter structure
which must be accommodated within relatively small
forming thereby the multiple wiring. Separate multiple
therethrough.
wiring and those of the adjustment operations which deter 50
The various objects and features of the invention will
appear from the description of an embodiment which
will be rendered below with reference to the accompany
mine the mutual positions of the contact elements of a
layer, are thus eliminated.
The above indicated general construction of punched
ing drawings. In the drawings,
contact elements is according to the invention utilized
FIG. 1 shows a keyset according to the invention as
in connection with contact spring banks for keyboards 55 seen from the front;
comprising individually operable keys, combined in a
FIG. 2 is a sectional view along the line A—-B of FIG. 1;
unit, thereby eliminating the previously noted disadvan
FIG. 3 represents a bottom view looking at contact
tages of prior contact spring bank structures. This ob
ject is achieved by the provision of contact springs co
operatively associated with the keys, such contact springs
forming part of an interrelated contact multiple connected
spring banks disposed in the space extending below one
of the mounting plates therefor
FIG. 4 shows contact spring sets disposed within the
space extending between the two mounting plates;
FIG. 5 is a fractional view illustrating a key comprising
a plungerlike member extending through and guided
within vertically aligned openings formed in the two
together by means of webs which are arranged and con
structed so that at least portions thereof constitute in the
assembled condition of the multiple at least part of the
interior wiring required ‘for the keyboard. All contact
springs of a layer, in given cases together with the respec
mounting plates; and
FIG. 6 is a part sectional side view of the key bank.
tively associated multiple wiring, and at least part of the
Referring now to FIG. 1, there is provided a bridgelike
interior interwiring, for example, connecting bridges, are
mounting plate 1 surmounted by a similar bridgelike
thus made of one piece. Adjustment operations for posi
mounting plate 2. The mounting plates 1 and 2 are pro
tioning the individual parts in a layer each with respect 70 vided with respectively vertically aligned openings formed
to the other and a considerable part of the work required
therein for receiving and guiding plungerlike actuating
3,051,799
3
4
members 3 respectively extending from keys in the rows
of keys 4 and 5. Upon the underside of the mounting
plate l are disposed contact spring sets to be operatively
affected by the actuating members 3 extending from the
respective keys, such contact spring sets resting respec
Changes may be made within the scope and spirit of
the appended claims.
ing a plurality of respectively individually operable keys
tively against stepped sockets 6; further contact spring
sets It}, for particular purposes, being disposed between
forming sets of contact springs respectively cooperating
We claim:
1. A keyboard for use in a communication system, hav
assembled to form a unit, contact springs disposed in layers
the space extending between the top side of the base plate
with the respective keys, the contact springs included in
plate 1 and the bottom side of the base plate 2 as shown
each layer being formed from a punched sheet and inter
in FIG. 4. The individual keys are arranged in two rows 10 connected by webs to form a contact spring multiple there
4 and 5, one in back of the other, the actuating members
for, said webs being disposed to connect two respective
3 extending from the keys in the back row being longer
springs in series and pairs of springs in parallel, said webs
than those extending from the keys in the front row.
being severable with retention or removal of selected
Numeral 19 in FIG. 2 indicates the cover for the key
webs determining the conductive interconnections between
bank.
15 said springs in accordance with at least part of the interior
The contact springs of the contact sets disposed un
wiring of said keyboard.
2. A keyboard according to claim 1, wherein the con
tact springs extending in the multiples in alternately
derneath the bridge portion of the mounting plate 1 are
formed in groups each interconnected by a web such as
8 (FIG. 3) constituting a multiple therefor and the groups
opposite directions are internestled, the ends of the con
tact springs extending in identical direction being respec
are interconnected by transverse webs 8’. These groups
of multipled springs are assembled in layers to form the
respective contact sets. Contact springs which are not
tively interconnected by a web and at least one transverse
web extending substantially parallel to said contact springs
for interconnecting said ?rst noted webs.
3. A keyboard according to claim 1, comprising a ?rst
to be electrically interconnected may be disconnected from
the respective multiple web by cutting out the correspond
ing portions thereof after the assembly of the contact 25 bridgelike mounting plate forming a downwardly extend
spring sets is completed. The outer ends of the contact
springs may be provided with soldering tabs if desired.
Ribs 9 which are integral with the mounting plate deter
ing space for receiving said contact spring multiples, a
second bridgelike mounting plate disposed above said ?rst
mounting plate forming with the top side of the latter
mine the lateral positions of the contact springs. The in
plate another space for receiving further contact sets,
dividual contact springs rest ‘against different steps of the 30 plunger-like actuating members extending respectively
sockets 6, depending upon their shape and length, thus
from the respective keys through holes formed in said
forming functionally different contact sets.
mounting plates for operatively actuating said contact
The manner of guiding the plungerlike actuating mem
sets.
bers 3, extending from the respective keys, in correspond
ing vertically aligned opening formed in the mounting
35
plates 1 and 2 is apparent from FIG. 5. The illustrated
key, marked by numeral “1” belongs to the back row 4
4. A keyboard according to claim 3, comprising lateral
ribs and partially stepped socket means respectively car
ried by said mounting plates for cooperation with the
ing members are of generally cylindrical shape, carrying
respective contact spring sets in accordance with the opera
tive function thereof.
5. A keyboard according to claim 3, wherein the holes
formed in the respective mounting plates have recesses
at the lower end thereof a lateral extension or ear 11
extending laterally therefrom in angularly different di
(FIGS. 1 and 2) of keys which also includes the keys
marked by numerals “2” to “5.” The plungerlike actuat
which is upon insertion of the key passed through a cut
rections, said actuating members having positioning bosses
out 12 extending laterally from the circular hole in the
extending laterally therefrom for passage through said
base plate 2, entering a similar lateral cutout extending
rec?ses upon placing the respective keys into position on
from the circular hole 13 in the base plate 1. The lateral 45 the keyboard.
cutouts 12 in the two base plates 2 and l are angularly
6. A keyboard according to claim 3, comprising a
mutually displaced, thus preventing inadvertent dropping
knife-edge-journalled
rocking member disposed upon said
out of a key from the keyboard.
second mounting plate, said rocking member constituting
Referring now to FIG. 6, showing the key bank in side
view with parts in section, numeral 14 indicates a rocking 50 a switching element and the arms thereof extending into
the path of actuating motion of at least some of said keys.
member journalled upon knife edges formed by member
7. A keyboard according to claim 6, comprising spring
15 and held in place by means of a resilient bracket 16.
means for holding said rocking member in assigned posi
Extensions 20 of the rocking member 14 project down
tion journalled upon said knife-edge.
wardly through openings in the upper base plate 2 for
8. A keyboard for use in a communication system, hav
actuating the contact spring sets 10 (FIG. 4) disposed 55
within the space between the two base plates. The rock
ing a plurality of respectively individually operable keys
ing member 14 is actuated by the individual keys in the
assembled to form a unit, contact springs disposed in layers
two key rows, each key 17 of the front row, upon actua
forming sets of contact springs respectively cooperating
tion thereof, tipping the rocking member 14 clockwise,
with the respective keys, the contact springs included in
as seen in FIG. 6, and each key of the back row being 60 each layer being formed from a punched sheet and inter
provided with a camming member 18 which is upon actua
connected by webs to form a. contact spring multiple
tion of such a key operative to tip the rocking member 14
counterclockwise. The extensions 20 carried by the ‘rock
therefor, said webs being disposed to connect two respec
tive springs in series and pairs of springs in parallel, said
ing member 14 are incident to the tipping thereof cor
respondingly moved to actuate contact springs such as 10, 65 webs being severable with retention or removal of selected
shown in FIG. 4. The plungerlike actuating members 3
of the keys in the back row 4 (FIGS. 1 and. 2) are longer
than the corresponding actuating members of the keys in
the front row 5 (FIGS. 1 and 2) and the faces of all keys
are, therefore, clearly visible from the front of the key 70
board.
The plungerlike actuating members of the keys are
webs determining the conductive interconnections between
said springs in accordance with at least part of the interior
wiring of said keyboard, a ?rst bridgelike mounting plate
forming a downwardly extending space for receiving said
contact spring multiples, a second bridgelike mounting
plate disposed above said ?rst mounting plate forming
with the top side of the latter plate another space for re
guided within the openings in the base plates with su?i
ceiving further contact sets, plunger-like actuating mem~
cient play to prevent binding of the keys in their openings
bers extending respectively from the respective keys
in the cover 19 (FIG. 2) upon actuation of the keys.
75 through holes formed in said mounting plates for opera
3,051,799
5
6
tively ‘actuating said contact sets, a knife-edge-journalled
rocking member disposed upon said second mounting
plate, said rocking member constituting a switching ele
References Cited in the ?le of this patent
UNITED STATES PATENTS
ment and the arms thereof extending into the path of
actuating motion of at least some of said keys, said keys 5
being ‘arranged in two horizontally extending rows, the
plunger-like actuating members of the keys of the rear
wardly positioned row being longer than those of the keys
of the forwardly positioned roW and being respectively
provided with a lateral extension the lower edge of which
cooperates with one arm of said rocking member, the
lower edge of the respective keys in the forwardly posi
tioned row cooperating with the other arm of said rocking
member.
1,277,478
1,886,284
2,034,938
2,405,211
2,577,067
2,650,957
2,713,092
2,813,160
2,824,924
2,885,499
2,969,439
Raynolds _____________ __ Sept. 3, 1918
Luther _______________ __ Nov. 1, 1932
Bierenfeld ____________ __ Mar. 24, 1936
Hartley ______________ __ Aug. 6, 1946
Arthur- ______________ __ Dec. 4, 1951
Cohen _______________ __ Sept. 1, 1953
Rucks et a1. ___________ __ July 12, 1955
Tong ________________ -2 Nov. 12, 1957
Graybill et al __________ __ Feb. 25, 1958
Bentzman ____________ __ May 5, 1959
Dubois ______________ __ Jan. 24, 1961
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