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Патент USA US3073943

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Jan. 15, 1963
J. SCHMIER ETAL
3,073,933
ELECTRIC swrrcn
Filed May 29, 1959
3 Sheets-Sheet 1
INVENTORS
JACOB SCHMIER
HAROLD P‘ LEWIS
BMW
ATTORNEY
Jan. 15, 1963
J. SCHMIER ETAL
3,073,933
ELECTRIC SWITCH
Filed May 29, 1959
3 Sheets-Sheet 2
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INVENTORS
JACOB SCHMIER
HAROLD P. LEWIS
BY
WW
ATj'O RNEY
Jan. 15, 1963
J. SCHMIER ETAL
3,073,933
ELECTRIC SWITCH
Filed May 29, 1959
7
s Sheets-Sheet a
I
VI4!“
60
BI
26
2s
462
64
2O
INVENTORS
JACOB SCHMIER
HAROLD I? LEWIS
_
ATTORNEY
States
atent
1
3,073,933
Patented Jan. 15, 1963
2
shaft carrying a cam, wherein the pawl, which is pivotally
3,073,933
ELECTRIC SWITCH
.Iacob Schmier, Allentown, and Harold P. Lewis, New
town, Pm, assignors to Rodale Manufacturing Co., Inc,
Emmaus, Pa., in corporation of Pennsylvania
Filed May 29, 1959, Ser. No. 816,789
mounted, also acts to rotate the ratchet wheel one tooth
at a time, together with its complementary cam; and the
push button when returned to its initial position, will
enable the spring pressed pawl to pivot itself so that it
will pass a ratchet tooth and be in position to actuate the
next ratchet tooth.
Other objects of our invention are to provide an im
4 Claims. ($1. 200-456)
Our invention relates to an electric switch, wherein a
push button controls the electrical circuit; whereby re
peated pressing of the push button inwardly causes the
electrical contacts to alternately close and open depend
ing upon the con?guration of a cam that controls the
movement of one of a pair of contacts.
proved device of the character described, that is easily
and economically produced, which is sturdy in construc
tion, and which is highly ef?cient in operation.
With the above and related objects in view, our inven
tion consists in the detail of construction and combina
tion of parts, as will be more fully understood from the
The primary object of our invention is to construct a 15 following description, when read in conjunction with the
accompanying drawings, in which:
shallow electric switch wherein a ratchet wheel is securely
mounted on the same shaft that carries a cam that en
gages one of the electrical contacts and wherein a pawl
for actuating the ratchet wheel will always be in correct
position to actuate the ratchet wheel.
'
FIG. 1 is a perspective view of an electrical push button
switch embodying our invention.
FIG. 2 is a plan view of our switch with the cover
20 removed.
FIG. 3 is a perspective view of the switch casing itself.
In the manufacturing of an electric switch for the
FIG. 4 is a perspective view of the pawl alone.
home, we have discovered that the bend in the flexible
FIG. 5 is a fragmentary sectional view of the electrical
contact which is engaged by a cam is not constant due
switch showing the electrical circuit in open position when
to variations in the thickness of metal. The metallic
alloy from which the ?exible contact arm is stamped is 25 along the line 5—5 of FIG. 1.
FIG. 6 is a view similar to FIG. 5 wherein the button
not absolutely constant thereby resulting in varying thick
has been pushed downwardly and the circuit closed.
nesses of the bend. Better control is obtained of the
FIG. 7 is an enlarged perspective view of the pawl and
movable contact arm on which the electrical contact is
?rmly mounted by having the metal for the movableor
complementary ratchet wheel and detent stop.
?exible contact arm made without any sharp bends there
in and having a portion of the flexible contact arm which
is to be engaged by the cam straight.
FIG. 8 is a sectional view taken along line 8—8 of
MG. 1 through the switch.
FIG. 9 is another sectional view taken along the modi
?ed type of switch having the push button illustrated in
FIG. 11 showing tthe pair of electrical contacts and the
Heretofore, we have found that by touching one side
of the push button, there may be a tendency to bind and
that the push button generally does not move in a recti~ 35 pentagonal cam for actuating one of the contacts.
FIG. 10 is an enlarged view showing the ?exible con~
linear direction along the shaft. With the elongated bore
tact and the penta-surface cam.
in the center of the push button of our present invention,
the push button can move'in a ‘direct rectilinear direction
FIG. 11 is a sectional view of the push button.
so that the touching of the button at any place on the
Referring now in greater detail to the drawing, we
outer surface of the button will not tilt the button.
show a casing, generally designated as A, of molded
It is, therefore, an object of our invention to provide
insulation material, such as a phenolic resin product.
a switch which is simple in construction and which has
Upon the casing A is a molded plate 10, which may
relatively few parts as contrasted with our switch as set
have-a metal wall box mounting plate 12 mounted there
forth in our Patent No. 2,820,113.
on. Aligned rectangular openings are'in the cover 10
Another object of our invention is to provide a simple 45 and the plate 12 whereby a push button, generally desig
switch which has a relatively small number of parts and
nated as B, may move back and forth in a rectilinear
which is easily and accurately assembled.
direction.
Another object of our invention is to provide an electric
Suitably mounted within the casing is a shaft 14, which
switch wherein a ratchet wheel is actuated by a pawl
carries a cam, generally designated as C, which has lobes
which is of a length whereby the pawl will always be 50 thereon in order to actuate or move an electrical contact
tangent to the circumference of the ratchet wheel.
arm, generally designated as D. A ?xed contact arm,
Another object of our invention is to provide a switch
generally designated as E, is adapted to have the contact
which will carry a heavy load over a relatively long period
button thereon engaged by'the contact button on the
of time without being rendered inoperable.
contact arm I) whereby the electrical circuit through
Another object of our invention is to provide a push 55 the switch may be completed. These contacts have been
button wherein there is an elongated bore in the center
described in greater detail in our previously ?led patent
thereof which moves the push button along a shaft only
application,
Serial No. 681,993, ?led September 4, 1957,
in a rectilinear direction.
now Patent No. 2,928,920, March 15, 1960.
Another object of our invention is to provide a push
A ratchet wheel, generally designated as F, is mounted
button wherein there is an elongated bore which is adapted 60
upon the shaft 14 which also carries the cam C. How
to ?t over a shaft wherein the push button cannot tilt with
ever, the shaft, the ratchet wheel, and the cams may be
respect to the longitudinal axis of the shaft.
integrally molded together so that the shaft and the
Another object of our invention is to provide an elec
ratchet wheel move in unison.
'
'
trical switch wherein the actuating pawl for a ratchet
The push button G, guided in vthe opening in the cover
wheel cannot be tripped into a non-operating position.
65 and the mounting plate 12, has a central internal bore
Another object of our invention is to provide a touch
62 de?ned by an elongated hollow integrally formed
button electrical switch wherein the actuating pawl for
cylindrical extension 64 which slides upon a ?xed. shaft
a ratchet wheel will always be guided into its proper path
20. The shaft 20 also has encircling it a spring 22,
of travel.
which presses a pawl, generally designated as G, against
In order to achieve the objects of our invention, we 70 the lower surface 24 of the push button B.
provide a push button electric switch having a pawl, a
The upper end of the pawl G has an extension or tail
complementary ratchet wheel mounted upon the same
28 which can oscillate about the hump 30 around the
3,073,933
bottom 24 of the push button B, The sides 23A, 28A
are adapted to engage the sides 26 of the push button so
.‘that the pawl G cannot rotate'from side to side about the
shaft 29 at its axis, butLmustl only move in one plane.
A central opening 28 through the pawl G enables the
pawl G to freely move vertically about the shaft 20. An
extension 36 is stamped or pressed at an angle from the
4
siderable detail, such description is intended as being
illustrative rather than limiting, since the invention may
be variously embodied, and the scope of the invention
is to be determined as claimed.
We claim:
1. In a switch having at rectilinear movable push but
ton, a ratchet wheel, a pawl- pivotally and resiliently
mounted against the bottom of saidv push button, a shaft
portion 35 of the pawl G and the extension 36 actually
on which said wheel is mounted, a cam mounted on said
moves the ratchet wheel when the push button B is moved
inwardly, as shown in FIG. 2. On its outwardly direc 10 shaft to rotate in unison with said ratchet wheel, a mov
tion, the push button and the pawl B move upwardly
against the ratchet wheel but the detent, generally des
ignated as H, shown in FIGS. 5, 6, and 7, prevents the
ratchet wheel from moving in one direction by virtue of
the detent engaging one tooth of the ratchet wheel.
15
The portion 35 of the pawl rests against‘ the cam teeth
P so that there is always some part of the pawl G in
contact with the ratchet wheel.
The lower end portion 38 of the pawl G is extended
to prevent the ratchet wheel contact portion 36 from
being trapped in a non-operating position as would be
the case if the free end 38 of the pawl would’ move
vertically over the center of the shaft 14.
able electrical contact in operative engagement with said
cam, a stationary contact positioned to be engaged and
disengaged by said movable contact in accordance with
the rotation of said cam, one end of said pawl having an
extension to engage and move said ratchet wheel and a
portion of said pawl extending below said extension
whereby a portion of said pawl will always be in abut
ment with said ratchet wheel.
2. The invention of claim 1 including a casing and a
detent, to prevent the rotation of said ratchet wheel in
one direction attached to said casing.
3. In a switch assembly, a casing constructed of elec
trically insulating material, an upright shaft in said cas
ing, a movable push button which is movable toward and
direction‘, the spring-like detent H lightly engages the 25 away from the interior of said casing and is slidingly tele
scoped over said shaft, said casing enclosing a ratchet
lowermost teeth in the ratchet wheel E.
wheel, a pawl pivotally and resiliently mounted against
In FIG. 5, we show a ?exible electric contact arm D1,
the bottom of said push button and in operative engage
which is anchored at its end 40. The ?exible contact D1
ment with said ratchet wheel, a cam coaxially mounted
is made of a single metal stamping and it is ?rmly an
To prevent the ratchet wheel from moving in one “
chored' at its end 40. From the end is an adjoining bend 30 with’ said ratchet wheel on a common rotatable shaft, a
42, which, jointed to an off-set portion 44, to continue to
a straight elongated extension 46. The connecting por
tion 48 of the ?exible contact is connected to an off-set
free end 50 that carries an electrical contact button 52.
It should'be noted that a‘ portion of the elongated straight
portion 46 of‘the ?exible arm is adapted to be engaged
by one of the ?at surfaces of the pentagonal cam F1.
The cam F1 and ?ve ?at surfaces de?ned by the straight
faces 54, 55, 56, 57 and 53. It should be noted that as
movable electrical contact operatively engaged with said
cam, a stationary electrical contact positioned to be en
gaged and disengaged by said movable contact in accord
ance with the rotation of said cam, a spring assembly urg
ing said push button away from the interior of said cas
ing; and a hollow extension on said push button tele
scoped over said shaft and comprising a guide means for
said spring assembly.
4. In a switch assembly, a casing construction of elec
trically insulating material, an upright shaft in said cas
the shaft 14 on which the cam F1 is mounted, is rotated, 40
ing, a movable push-button which is movable toward
the junction of two of the adjoining faces moves a greater
and away from the interior of said casing and is slidingly
distance from the center of the shaft 14 than the ?at
penta surface. Viewing FIG. 9, the contact 52 is lifted
away from the contact ?xed terminal E1, by virtue of
the edge of adjoining penta surfaces engaging the elec
trical contact 51 along the ?at connecting surface 48.
The ?exible contact arm D1 is anchored at one end
and by virtue of the bends therein its length is extended
to be freely ?exible.
The modi?ed push button, generally designated as B1,
is molded of insulating material and it has a ?at outer
surface 60 and it has a central internal bore 62 de?ned
by an elongated hollow integrally formed cylindrical
telescoped over said shaft, said casing enclosing a ratchet
wheel, a pawl pivotally and‘resiliently mounted against
the bottom of said push button, with one end of said
pawl. having an extension to engage and move said ratchet
wheel, and a portion ofv said pawl extending below said
extension whereby a portion of said pawl will always be
in abutment with said ratchet wheel, a cam coaxially
mounted with said ratchet wheel on a common rotatable
shaft, a movable electrical contact operatively engaged
with said cam, a stationary electrical contact positioned
to be engaged and disengaged by said movable contact in
accordance with the rotation of said cam, a spring assem
extension 64. The push button also has an internal side 55 bly urging said push button away from the interior of
recess 26 to provide for the reception of the free end of
said casing, and a hollow extension on said push button
the pawl 28. It is to be noted that the distance from
telescoped over said shaft and comprising a guide means
the surface 60 to the end of the cylindrical member 64
for
said spring assembly.
is almost three-quarters of the distance measured from
the surface 69 to the interior bottom surface of the cas 60
References €ited in the file of this patent
ing A.
UNITED STATES PATENTS
By the construction heretofore explained, the push
button always will move in a rectilinear direction even
1,753,029
Sparks et al. __________ __ Apr. 1, 1930
though the surface 60 on the push button is touched at
2,048,451
2,572,335
Johnston _____________ __ July 21, 1936
'rlafke _______________ __ Oct. 23, 1951
its end to move it inwardly.
Hence, no binding of the parts for operating the con
tacts will occur.
2,885,515
Bentley et al. _________ __ May 5, 1959
2,933,578
Hubbell et al. ________ __ Apr. 19, 1960
950,617
France _______________ __ Oct. 3, 1949
The spring 22 reacts to any light touch upon the push
FOREIGN PATENTS
button B1 to operate the pawl and its cam.
Although our invention has been ‘described in con
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