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Патент USA US2120876

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June 14, 1938.
w_ TRAUTNER
2,120,876
HOLDING AND RELEASING SWITCH
Filed Oct. 4, 1937
5
INVEN T0R7
WAGN TRAUTNER.
{M?TORNEYS
BY
,
Patented June 14, 1938
2,120,876 '
UNITED STATES PATENT OFFICE
,
2,120,876
’ HOLDING AND RELEASING SWITCH _
Wagn Trautner, Hamilton, Ohio, assignor to
E. H. Kue?er, Oakland, Calif. _
Application October 4, 1937, Serial No. 167,231
11 Claims. (01.200-81)
'
. a bearing 9 for an actuating shaft’ 10. The lower
My invention relates to electric switches, and end of the shaft is provided with an armature
more particularly to an electric switch which
will hold, when contact is made, and which can
be released to a circuit breaking position by the
5 energization of a releasing circuit.
Among the objects of my invention are: To
provide a switch which will hold in contact mak- .
'ing position by friction, and which can be re
leased to a neutral position magnetically; to pro
10 vide a holding switch having a variable stroke;
to provide a self-centering holding switch; to
provide a holding switch having a magnetic re
lease; to provide a holding switch in the form
of a friction clutch; to provide a new and im
15 proved method of operating a holding switch;
and to provide a simple‘ and efficient holding
‘ switch of relatively few parts.
My invention possesses numerous other objects
and features of advantage, some of which, to
go gether with the foregoing, will be set forth in
the following description of speci?c apparatus em
bodying and utilizing my novel method. It is
therefore to be understood that my method is
applicable to other apparatus, and that I do not
25 limit myself, in any way, to the apparatus of
the present application, as I may adopt various
other apparatus embodiments, utilizing the
method, within the scope of the appended claims.
Other broad objects of my invention may be
30 more fully understood by direct reference to the
drawing, wherein
.
Fig. 1 is a longitudinal view partly in section
- and partly in elevation, of one ‘preferred form of
head ll of magnetic material, and a clutch disc
I2, preferably of insulating material, is ?rmly at
tached thereto, this clutch disc having a cone 5
portion l4 bearing against the cone 6 of the
metal disc.
thereon extending. radially outwardly and being
bent down to form a centering lug l1 passing
through a centering aperture It in the metal disc
4, and projecting still further into a centering
recess 19 in the clutch disc. A clutch spring 20 15
is provided, bearing ‘against the centering'washer
below and against a clutch spring retaining nut
2| above, the clutch spring retaining nut being
secured by a lock nut 22. A handle 24 is attached
to the clutch disc l2 and passes through a handle 20
slot 25 in the metal disc and in the casing.
Diametrically opposite the handle, and attached
to the periphery of the clutch disc, is a movable
contact 26 bearing against a central brush 21,
and laterally spaced from central brush 21 are 25
two lateral brushes 29 and 3!! bearing on they in
sulating periphery of the clutch disc, so that 1'
when the handle 24 is moved to right or left, one
or the other of the lateral brushes will make con
tact with the movable contact so that a circuit 30
may be completed between central brush 21 and
one of the lateral brushes. Each of the brushes
21, 29 and 30 is provided with a connection
screw ll.
my invention.
35
‘
-
g
Fig. 2 is a top view partly in section and partly
in elevation, of the switch shown in Fig. 1.
Fig. 3 is a back‘view oi! my invention, together
with a circuit diagram showing one manner by
which it may be utilized.
4”
Fig. 4 is a sectional view, taken as indicated
by the line 4-—4 in Fig. 2.,
In the preferred form of switch shown, the
.internal members of the switch are attached to
a casing which is formed in two parts, an upper
. 45 part I and a lower part 2. These parts telescope
and interlock to form a single unit. The upper
part I contains the switch mechanism proper, ,_
and a metal disc 4 extends across the casing and
is provided with a side wall 5 which is ?rmly
attached to the casing in any convenient manner,
such as by spot-welding, for example.
.
A‘ short distance away from the side wall the
disc is bent upwardly to form a truncated cone
.
Bearing against the upper surface 1 of the
metal disc, and surrounding bearing 9, is a cen
tering washer l5, having a centering arm 16 10
_
In order that handle 24 be normally maintained 35
in central position, I provide right and left cen
tering springs 32 and 34,_which are preferably
spiral springs, ?tted into spring cavities 35 in
the clutch disc, and being kept therein by the
close proximity of‘ this disc at that point to the 40
metal disc 4. Centrally, the cavities terminate
short of the center line between the springs, and
laterally, the springs engage spring lugs 36,
knocked down out of metal disc material. Thus,
there is a tension in both directions against the 45
disc l2, tending to center the disc so that neither
of the lateral contacts 30 or 3| makes connec
tion with movable contact 26. ' The centering lug
l1 ensures that the handle will rest in exactly
central position.
-
50
The portion 2 of the casing supports a release
magnet 40 having a magnetic coil 41 wound there
on, the coil and‘ magnet being supported by a coil
bracket 42 attached to the case by two magnet 1
0, the upper surface 1' extending toward the
center and being again turned upwardly to form - connections 44, insulated from the casing,
55
2
2,120,876
The operation of the device is simple. First,
pressure against the handle in either right or left
direction forces the centering lug i'l out of the
rangement eliminates a great many of the dis
advantages of former types of holding switches,
centering recess i9, and the handle may then
move to right or left to the extent of spring
where a uniform stroke is necessary in order that
the holding operation may take place.
The switch of my invention will hold in any 5
cavities 35, the stop being positive because of the
spring retaining lugs 36 contacting the back end
of the springcavities. Clutch spring 20 creates
given deviation from the central position, and I
have found it convenient also to so design the
centering lug in relation to the centering recess,
enough friction between the coned surfaces of the
metal disc and the clutch disc so that the handle
will stay in right or left position until magnet M
is energized, whereupon the armature head and
attached clutch disc is drawn toward the magnet,
that the handle will not hold at all unless moved
the minimum distance necessary to establish elec
trical connection. Thus, the operator can give
the handle any suf?cient stroke to make the han
dle hold, knowing full well that if the handle does
breaking the frictional contact, and the centering
spring which is under tension will center the
.handle instantly. As the clutch disc rotates,
centering recess i9 will be presented to centering
hold, electrical connection is being made, but this
stroke, after the holding has been accomplished,
lug ii, and the centering lug will drop therein
and the handle will come to rest in exact central
position.
In order to ensure a quick break of the clutch,
I prefer to insert between the clutch disc and
the metal disc a clutch release spring 65, and
balance spring 45 against spring 20 so that there
is always sumcient friction in the clutch to hold
the handle in any lateral position but to effect
release of the clutch with a minimum of mag
netic ?ux in magnet 4i.
While there are many circuits in which this
clutch may be utilized, only a simple circuit need
be shown, such as that illustrated in. Fig. 3.
Here, the central brush 2'! is connected directly
to a source of electricity 50, and each of the
lateral brushes 3!] and 3i are connected through
signal lamps BI and 52 to the other end of source
ill. Thus, when the handle is thrown either to
right or left, one or the other of lamps 50 or Si
is illuminated. In the release circuit a release
source 54 is connected in series with coil 4| and
may be of any length up to the full travel of the
handle.
It is of course to be fully understood that the
holding switch herein shown and illustrated is an
example only of holding switches which may be 20
designed by those skilled in the art, having be
fore them the disclosure herein, within the scope
of the appended claims.
I claim:
1. A holding switch comprising a stationary 25
member having a friction surface thereon, a mov
able member rotatable adjacent said stationary
member, a spring urging said members together
in frictional relationship, a movable contact car
ried by said movable member, a stationary ‘con
tact positioned to connect with said movable con
tact upon rotation of said movable member, resili
ent means holding said movable member in pre
30
determined position, means for rotating said
movable member, and means for breaking said 35
frictional relationship._
2. A holding switch comprising a stationary
member having a friction surface thereon, a mov
able member rotatable adjacent said stationary
member, a spring urging said members together‘ 40
push button 55. When the push button is
operated the coil is energized, the magnetic
armature head II is drawn toward the magnet‘,
and the clutch is released, whereupon the handle
returns to central position.
Several points should be emphasized in the de
45
scription of the particular switch shown, and the
main point is that handle 24 does not have to be
in frictional relationship, a movable contact car
ried by said movable member, a stationary con
tact positioned to connect with said movable con
tact upon rotation of said movable member, resili
ent means holding said movable member in pre 45
moved to the full extent of its stroke in order that
the right or left brush 29 or 30 contactthemovable
50 contact 26. The permissible stroke of the han
tional relationship.
40
determined position, means for rotating said
movable member, and magnetic means positioned
to draw said members apart to break said fric
3. A holding switch comprising a stationary 50
dle is preferably made approximately three times
member having a friction surface thereon, a mov
or more the length of the distance between mov
able contact Y26 and either of the brushes 29 or 30.
able member rotatable adjacent said stationary
member, a spring urging said members together
Thus, contact will'be made in the lamp circuits,
55 even though the handle 24 is moved only one
third or less of its permissible stroke, and I have
purposely arranged the switch in this manner so
that a hurried or incomplete operation of the
handle 24 will give a complete operative connec
tion of the interior contacts.
Many times, in switches of this type, particu
larly, for example, when used as a steering gear
switch for vehicle signalling, it is di?icult to give
a complete, full length stroke of the handle, and
65 in holding switches of other types heretofore uti
lized, if the full stroke is not given the handle
will not hold in indicating position. Conse
quently, I have provided a switch which does not
require a full stroke, and which may have, after
70 a certain minimum stroke, a wide variation in
stroke without affecting the electrical operation
of the switch. It is therefore particularly
adapted to quick ?ipper action, where one cannot
be certain of the exact distance the flip is going
75 to carry the handle, and I consider that this ar
in frictional relationship, a movable contact car
ried by said movable member, a stationary con
55
tact positioned to connect with said movable
contact upon rotation of said movable member.
resilient means holding said movable member in
predetermined position, means for rotating said
movable member, an armature on said movable
member, and an electromagnet positioned to act
on said armature to draw said members apart to
break said frictional relationship.
4. A holding switch comprising a stationary 65
discyhaving a frictional surface thereon, a rotat
able disc having a shaft extending through a
bearing in said stationary disc, 9. spring bearing
against said shaft at one end and said stationary
disc at the other end to frictionally connect said‘ 70
discs, contacts engageable by rotation of said
‘rotatable disc, resilient means positioned to center
.said rotatable disc in a predetermined position,
and of insufficient force to act against the trio
tion of said discs, and. means for breaking said
9,120,876
frictional connection to allow said resilient means
to operate to center said rotatable disc.
5. A switch in} accordance with claim 4, with
a friction lock for said rotatable disc when in
central position.
6. A switch in accordance with claim 4, with
a resilient lug registering with a recess in said
rotatable disc when in central position.
'7, A holding, switch comprising a stationary
10 disc, a rotatable disc Journaled on said stationary
disc and having a frictional surface cooperating
3
wherein an axle of magnetic material is pro
vided, fixed to said rotatable disc and journaled
in said stationary disc, one end of said axle
forming said armature.
9. Apparatus in accordance with claim '7,
wherein an axle of magnetic material is provided,
ilxed to said rotatable disc and iournaled in
said stationary disc, one end of said axle form
ing said armature, and where the two cooperat
spring urging said surfaces together, resilient
10
ing surfaces are coned'surfaces.
10. Apparatus in accordance with claim '7,
wherein a resilient lug is provided, registering
with a recess in said rotatable disc when in said
means positioned to return said rotatable disc
predetermined position.
with a similar surface on said stationary disc. a
16 to a predetermined position only upon breaking
of frictional contact between said discs, circuit
making means operable only by rotation of said
rotatable disc away from said predetermined po
sition, an armature
20 magnet positioned
against said spring
tact and allow said
11. Apparatus in accordance with claim '7, 15
wherein stop means are provided, limiting the
rotation of said rotatable disc to a predetermined
arc on both sides of said predetermined position,
on said rotatable disc, and a
and wherein said circuit making means are op
to pull on said ajrmature
to break said frictional con
disc to return to said prede
erated at the beginning of relative movement
termined position.
8. Apparatus in accordance with claim '7,
between said disc and over the entire predeter
mined arc, excluding said predetermined position.
WAGN 'I'RAUTNER.
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