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Oct. 29, 1946.
L. B. HAIGH ET AL
2,410,062
TEIZJEIPHONIE.'l KEY
Filed May 6, 1944`
2 Sheets-Sheet 1
25
BY
0d» 29, 1946.
L.
HAIGH ErAL
2,410,062
TELEPHONE KEY
Filed May 6, 1944
2 Sheets-Sheet 2
e@
Se'
INVENTORS
LESLIE B. H/q/GH
FÑHNKL//Y r4.
BY
'Y `AÉGENT
Patented Oct. 29, 1946
2,410,062
UNITED STATES PATENT OFFICEf
2,410,062
TELEPHONE KEY
Leslie BL Haigh, West Orange, and Franklin A.
Stearn, Westfield, N. J., assignors to Federal
Telephone>
and Radio Corporation, New York,
N. Y., a corporation ofy Delaware
Application May ‘6, 1944, Serial No. 534,420
1
2 Claims.
Thisinvention relates to electrical switching
keys vof the type known as lever keys and more
particularly to such keys designed for use in-places
where space is at a premium.
One object of this invention- is to provide a lever
key which willbe easy to manufacture and which
_will require the minimum number of parts in
manufacturing.
(Cl. 179-176)
2
The single sided key of this invention shown
in Figs. 1 to 5 includes two side plates I0 and II,
held together by a single screw I 2. A- locating
stud I3 pressed out of or secured in each plate I0
registers in a corresponding aperture in the other
plate, although the actual clamping together of
the plates is accomplished-solely by means of
screw I2. Screw I2 passes through holes in the
Another object of this invention is to provide
a key in which the frame and actuating cam as 10 plates-'Ill and II and through a spring assembly
member I4, and is secured by a square nut I«2-'~
sembly is held together by means of a single screw,
which
sits in a recess inmember I4. Member I4this screw likewise Vmountingfthe spring assembly
las, fastened upon the sides» thereof by means- of
or assemblies-upon the frame-proper of the key.
screws I5, two spring assemblies I6 and I .'I, located
»Yet another object of this invention is to pro»
vide a key in which only a singletype of cam is 15 uponthe opposite sides of member I4. The num
ber of contact springs forming each of thesetwo
employed whether the key be a two or afthreev
assemblies and their interconnection and opera
yposition key and whether locking or non-locking
tion with respect to opening and closingvarious
action be required, and infwhich pairs of oppo
contacts, is» not material to this linvention, since
sitely disposed»v holes- are provided in theV key
the number of springs used and these» various
frame, in which holes a stop pin or pins may alter
natively be placed to determine the extent of rota
tion of thel cam and thevextent ofA throw of the
key.
interrelationships can be determined according
tothe particular use `to which the key is `to be put.
More rigid members I8 and I 9 Vmay be provided
in order to limit the motion of certain springs,
if so desired. The actuation of the springsy uponv
Another purpose of this invention is to provide
a key in which economical-assembly is promoted 25
the respective sides of member I4is brought about
by arranging the cam rollers so that theyl run
by actuating contact springs 20 and 2 I, which are
freely upon the cam stud and are held'thereupon
elongated above the ends of the other contactY
by a portion of the frame.
springs and have the elongated lportions thereof>
Other purposes and advantages‘of this inven
tion will be apparent to those skilled in the artv 30 formed in such fashion that roller 22 will cause
lateralmotions of the actuating springs. Roller
from a consideration of the drawings hereunto
22» rotates freely upon cam stud 23, and stud 23 isr
appended, where
_ Fig. 1 represents a single sided key, in front
mounted upon a portion of the cam body 24, which ,
latter is provided with a suitable handle 25. The
elevation and unoperated position.
Fig. 2 represents a single sided key, in front 35 roller 22 is prevented from running off the end
of the stud by means of a lip 26 which projects
elevation and in operated position.
downwardly from the upper portion of frame
Fig. 3 shows the same key in side elevation and
member I0. This avoids the'necessity of rivet
unoperated position.
ing a washer upon the stud after the roller has
Fig. 4 shows, in rear elevation, the same key inv
been placed thereupon, or otherwise retaining
unoperated position.
the roller in position thereupon.
Fig. 5 is a top plan view of the vsame key.
Fig. 6 is a front elevation, of a double sided
key according to this invention, shown in un'
operated position.
Frame members I0 and II are provided with
oppositely located bearing apertures 36’. Cam
body 24 is provided with a bearing 50, of the
Fig. 7 is a front elevation of a double sided key 45 hollow shaft type, which rotates upon a piny 30.
in operated position.
.
This pin has the two ends'thereof inserted into
the pair of corresponding apertures 39', atV the
Fig. 8 is a side elevation of a double sided key,
time when the key is assembled. Frame members
in unoperated position; and
l0 and II are also provided with suitable aper
Fig. 9 is a side view of the cam employed in
this key.
tures 29 and 29'; registering with one another
50 when the respective frame members are as
2,410,062
3
sembled. These apertures may be utilized for
limiting the key motion to the desired extent by
4
22'.
In this case, likewise, a suitable lip 26’ ex
tends downwardly from the upper portion of
each frame member 4D and 4|, so that the cam
placing pins in the apertures. According to the
rollers are prevented from running oiî the ends
pair of apertures 29 which is chosen to act to hold
the stop pins for the cam 24, the functioning of Ul of the respective studs upon which they rotate.
In both the single and double sided forms of
the cam may be arranged so that the key can
key
according to this invention, the extreme an
assume any one of five possible operative com
gular rotation of the cam may be limited by suit
binations; namely,
able means, which do not form an essential part
Single non-lock
10 of the instant invention. For example, the lower
portion of the cam may be provided with one or
Single lock
more projections, 5| in the single key and 5|’ in
Double non-lock
the double key, which encounter a limiting or
Double lock
Lock on one side, non-lock on the other side.
stop projection 52 or 52', provided upon one or
both of the frame members in the two forms of
If the key is to be “locking” on either side, no
key.
pin 54 is used on that side the motion of the cam
Fig. 9 shows the cam provided with main stop
being limited only by the yprojection 52. In this
projections 5| and ancillary stop projections 55,
extreme position the tension of the spring 20 or
these latter being located at a shorter distance
2| is exerted against the roller 22 in such direc
tion that it holds the cam in its operating posi- 20 from the axis of rotation of the cam than are
projections 5|. This arrangement permits the
tion by a toggle action. A pin in the pair of upper
uppermost apertures to be located at a suflicient
holes on either side' makes it “non-locking” on
distance from the top of the key to enable in
that side since the force applied by the spring
sertion of the mounting screws 42, 43 without
against the roller is in such a direction that it
fouling the stop pin when it is inserted in these
will return the cam to its medial position when
apertures. According to the particular pair of
the key is released. A pin in the pair of lower
apertures 29 or 29’ chosen, stop pin ‘54 will en
holes on either side blocks the cam against rota
counter one only of the stop projections 5| or
tion on that side and converts the key into a two
55, thus allowing the degree of angular rotation
position or “single” key.
One form of stop pin is indicated at 54 in the
drawings, and is preferably identical with pin 3D.
Referring now to the double sided form of key
shown in Figs. 6, 7 and 8, the frame is here con
stituted by two substantially identical members
40 and 4|. Spring assemblies are arranged upon
both sides of these frame members, the mem
bers being held together by screw |2', which
passes also through the mounting members I4’
of both spring assemblies. In this case, also, this
allows the employment of a single screw to hold 40
the frame members together and the spring as~
semblies thereto, thus saving time in assembly
and reducing the cost of manufacture.
The number of springs and the arrangements
of contacts employed in this form of key are
not essential features of the instant invention
and may be selected according to the desired
functioning of the key. The members serving
to actuate the contact springs are similar to those
previously shown and described in connection
with the single sided form of key and here bear
corresponding reference numerals.
In the double sided key, each frame member
40 and 4| is provided with its own fastening aper
of the cam to be determined by such selected po
sition for the stop pin, since the respective radii
of the various pairs of apertures with respect to
the axis of rotation oi the cam are not identical
but are Varied so that the desired cam projec
tion may be engaged with the stop pin.
Modifications and alterations of the keys above
described by way of example, will be apparent to
those skilled in the art and this invention is lim
ited only by the scope of the hereunto appended
claims.
What is claimed is:
1. A switching key comprising a frame, a ro
tatable cam mounted upon a pivot in said frame,
Contact springs operable by said cam, a projec
' tion on the periphery of said cam, a plurality of
pairs of oppositely disposed holes in said frame.
said pairs of holes being located at different an
gular positions relative to the said pivot and at
such radial distance from said pivot that said
cam projection passes over each of said pairs of
holes during rotation of said cam and a remov
able pin for insertion in any one of said pairs of
holes for cooperation with said projection where
by the degree of rotation of said cam and the
extent of throw of the key may be varied.
tures located upon the extreme upper surface 55 2. A switching key comprising a frame, a ro
thereof, into which apertures fastening screws 42
tatable cam mounted upon a pivot in said frame,
and 43 may be threaded.
contact springs operable by said cam, a plurality
The alignment of the two frame members is
of projections on the periphery of said cam hav
maintained by studs I3’ one pressed out of or se
ing cam surfaces at different radial distances
cured in each frame member. Oppositely dis 60 from said pivot, a plurality of pairs of oppositely
posed pairs of apertures 29' are provided in the
disposed holes in said frame, said pairs of holes
upper portion of frame members 40 and 4|, so
being located at different radial distances from
that the pins 54 used as stops for the cam may
said pivot such that said projections each pass
have their positions suitably determined at the 5 over one of said pairs of holes during rotation
time of assembly, according to the particular
of said cam and a removable pin for insertion
function which the key is to perform. Accord
in any one of said pairs of holes for cooperation
ingly the double sided key may likewise be uti
with said projections whereby the degree of ro
lized in any one of the five possible operative
tation of said cam and the extent of throw of
combinations, as above detailed in describing the
the key may be varied.
70
single sided key.
In the double sided key, there are provided two
LESLIE B. HAIGH.
cam studs 23', located upon opposite sides of the
FRANKLIN A. STEARN.
cam body 24’ and each stud bears a cam roller
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