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Патент USA US2405679

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G. lA. wAHLsTRöM
Filed Sept. 1l, 1944
' n'
,405,679 *
Patented Aug. 13, 1946
Gustaf Adolf Wâhlström, Akeshov, Sweden, as
signor to Telefonaktiebolaget L. M. Ericsson,
Stockholm, Sweden, a company of Sweden
Application September 11, 1944, Serial No. 553,609
In Sweden July 30, 1941
4 Claims.
The invention relates to a push button switch
provided with an operating finger pivoted in the
push button, said linger being adapted upon de
pression of the button alternately to operate a
cradle to two different positions, said cradle being
pivoted in the base. It is an object of the inven
tion to provide a switch of the present type giving
an effective, momentary closing and interruption
(C1. 200-67)
position. The rollers I ‘I thereby press against
the left portion of the lever I3 and the contact
device I4 takes the making position II. If the
button is now pressed down, the cradle 6 is turned
round the pivot 'I to the left as shown in Fig. 3
and the rollers I'I thereby roll on the lever I3,
pressing against the part of the lever I3 lying
to the right of the pivot I2 in such a way that
this part of the lever gets a turning moment
l0 directed downwards. The contact member I4 on
of the current and preventing the stationary con
tacts from being burnt when the current is inter
the lever I3 thereby has been brought from the
The invention will be more closely described
making position II to the breaking position I6
with reference to the enclosed drawing.
as appears from Figs. 2 and 3. This displace
Fig. 1 is a vertical section through the push
ment happens immediately before breaking of the
button axis.
15 circuit. When the different elements have ob
Figs. 2_4 are vertical sections along the line
tained the positions shown in Fig. 3, the part of
A-A in Fig. 1 showing the elements of the switch
the lever I3 lying to the right of the pivot I2
in different positions. Fig. 5 is a front View of
will suddenly be turned downwards thereby caus
the contact arms and the stationary contacts
ing the interruption of the current. The cradle
when the arms are in the position shown in Fig. 2. 20 6 is thereby turned to the position shown in Fig.
A push button I is movably arranged in two
4. Said displacement of the contact member I 4'
standards 2, a two-armed operating finger 3 of
from making-to breaking position is very advan
insulating material being pivoted in the push but
tageous since the contact plate I5 then can not
ton. Upon depression of the push button the two
be burnt in the making position. The lever I3
arms of the operating finger cooperate with the 25 thus performs an angular movement in relation
cradle 6, said cradle being mounted to oscillate
to the contact plate at the breaking of the cir
on the pivot 'I in the base 5. The cradle 6 con
cuit. On account of this movement it is possible
sists of two sector-formed plates 6a, 6b and a
to provide the contact plate with the above men
cross-piece 8. The plates are each provided with
tioned swell I6 inthe breaking position. The
cams 9, I0. The cradle is turned in a known 30 contact springs are thereby more tensioned in this
manner per se from one end position to the other
position and the breaking of the circuit will occur
upon depression of the button I, A double, two
more quickly. Upon repeated> depression of the
armed lever I3 is mounted on the pivot I2 in the
push button the arm 3 will cooperate with the
cradle 6, the arms I3a., I3b thereby being pro
edge I0 of the cradle thereby turning the cradle
vided with contacts I4 cooperating with station 35 to the position shown in Fig. 2. The rollers I‘I
ary contacts I5, each of said contacts being pro
are thereby rolling along the lever I3 from the
vided with a plane surface II for making the
position shown in Fig. 4 until they occupy such
circuit (“making-position”) and a surface for
a position on that part of the lever I3 lying to
breaking the circuit (“breaking-position”), said
last mentioned surface being provided with a swell 40 the left of the pivot I2, that a turning moment
is obtained which is su?licient to turn the lever
I6. The lever I3 is operated by a device I'I con
I3 and the cradle 6 to the positions shown in
sisting of two rollers I'Ia and I'Ib fastened on a
Fig. 2.
pivot I8. The pivot I8 is mounted in an arm
Through thefcombination of the sector-formed
I9 being movable in the direction of the depres
6 and the lever I3 which is carried by a
sion of the button in notches 20 in the base. 45
pivot I2, mounted in the upper part of said cradle
Said arm I9 also carries a bar 23 of insulating
and being moved on the turning of the cradle 6,
material, a coil spring 25 being arranged around
also is rendered possible to make the base very
said bar’and ñxed between the cross-piece 26 of
low through maintaining the remaining ordinary
the arm 3 and a flange 24. The rollers I'I con
sequently engage the lever I3 under spring ten
I claim:
sion and on movement of the arm 3 the roller I'Ia
1. A push button switch comprising a base, a
will roll on the lever I3a and the roller I'Ib on
push button, a cradle pivotally mounted in the
the lever I 3b.
base, stationary contacts on said base, means
Fig. 2 shows the lever I3 in the making posi
tion, the cradle 6 thereby occupying its right end Ylus operable during successive actuations of said but
ton to alternately turn said cradle into two dif
ferent positions, a two armed lever, contact mem
bers carried by said lever and engageable with
said stationary contacts, means mounting said
lever to pivot in said cradle about an axis dis
placed from the pivotal mounting of the cradle,
spring means exerting pressure on and tending
to turn >,said lever about its pivot, the point of
3. A push button switch as claimed in claim 1
wherein said spring means includes a bar mov
able in the direction of movement of the push
button, a roller on said bar engaging said lever,
and a spring operable to apply said roller to said
lever and to restore the push button to its initial
4. A push button switch as claimed in claim 1
application of pressure of the spring means on
wherein Vat least said stationary contacts are pro
said lever shifting along the lever from one arm
vided with raised portions coacting with the con
to the other arm thereof as said cradle is turned Y10
(from one position to the other.
tact members at the moment the contact between
2. A push button switch as claimed in claim 1>- ' Y-saicl‘contacts and contact members is broken.
wherein said spring meansnormally tends to re->
store the push button to its initial position.
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