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Патент USA US2407572

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Sept. 10, 1946.
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M_ F_ MlLLER
INTERMITTENT SWITCH
Filed June' 16, 1944
\\
2,407,571
2,407,57l
Patented Sept. 10, 1946
UNITED STATES- PATENT OFFICE
_
2,407,571
INTERMITTENT SWITCH
Milo F. Miller, Kansas city, M0.
Application June 16, 1944, Serial No. 540,586
6 Claims. (Cl. 20D-33)
1
.
filed January l0, 1944, in that the periodic switch
rI‘his invention relates to electrical apparatus
in the nature of intermittent switches employed
disclosed therein, may be made as hereinafter
in circuits where it is desired to periodically close
a circuit to operate electrical apparatus, and the
primary aim is to provide such a switch wherein
the essential element constitutes a volume of con
set forth.
5
ducting liquid, the surface whereof is raised and
lowered in properly timed relation with respect
to the appearance of a movable brush upon each
of a series of contact plates.
Another important object of this invention is
to provide an intermittent switch for electrical
circuits having means for insuring that the clos
ing and opening of the'circuit will occur only
while a movable brush is passing across the faces
of each of a number of short contact plates, said
means including a specially formed, rotatable
.
The switch about to be described may be used
in the electrical system set down in my said
co-pending application, and therefore, it will be
understood that the circuit diagrammatically il
lustrated in Fig. 2, may be of any character so
long as the switch assembly is disposed therein
to periodically supply a number of electrical
appliances Iii, I2, I4 and I6 with operating cur
rent.
,
.
_
The source of electrical supply, in the instance
illustrated, is a conventional battery I8 and a
conductor 2% .extends from this battery to the
elongated, stationary contact memberv 24, sup
ported in a casing of insulating material 26.
Opposed to this elongated contact member 24, are
hollow element having current conducting liquid
a. number of relatively short Contact plates Z3,
therein, the surface whereof is raised and lowered
Sù, 32 and 34, each connected to their respective
to and from engagement with a part of the rotat 20 appliances Iii, I2, I4 and IG by conductors form
able element as the brush reaches and leaves each
ing a part of the circuit. Other conductors join`
of the several contact plates.
appliances Iû, I2, I4 and IS with battery i8 and
Intermittent switches usually embody rela
connection thereto may be as illustrated, or other~
tively expensive and complicated parts where ` wise, to supply the proper voltage as the situation
arcing is effectively overcome. Switches of this
type may be made to present a rugged structure
which positively functions if the shiftable assem
bly thereof includes a properly contoured, hollow
contact member timed ‘as hereinafter set forth,
so that no current will be present until the brush
of the movable assembly is actually resting upon
one of a series of contact plates. It is, therefore,
the main object of this invention to provide a
simple, inexpensive and efficient intermittent
switch that embodies a volume of current con
ducting liquid, the level whereof may be raised
and lowered in a predetermined manner.v
-
demands.
,
,
Referring now to the intermittent switch and
the preferred manner of constructing the same,
elongated contact member 24 is preferably in the
form of a rack having teeth 35 formed thereon,
which mesh with teeth 38 on a hollow, rotatable
element 40, which is formed of conducting mate
rial as is Contact member 24.
Element 40 is hollow and the interior thereof
, is provided with a number of pockets 42, radially
arranged and disposed to raise and lower the
level of liquid 44 therein. This liquid may be any
substance capable of flowing rapidly into pockets
Minor objects o-f the invention will appear dur
42 as element 40 is rotated.
ing the course of the. following specification,
A part 46 in the form of a shaft extends axially
referring to the accompanying drawing wherein: 40 through element 4U and into engagement with
Fig. 1 is a top plan view of an intermittent
yoke 48, bifurcated as illustrated in Fig. 3, and
switch made in accordance with the present in
continuing into a barrel 5i) having brush 52 slid
vention.
.
ably mounted therein. Spring 54 bears upon the
Fig. 2`is a vertical longitudinal centra-l sec
inner end of brush 52 and yieldably maintains
tional view through the switch taken on line 45 its outer end against the inner surface of one
II-II of Fig. 1.
wall of case 2li or against contact plates 28, 3Q,
Fig. 3 is a transverse sectional view through
32 or 34, as the case may be. The sides of element
the switch taken on line ïIï-lII-of Fig. 2 and
4f) areformed of non-conducting material and
looking in the'direction of the arrows; and
are in the nature of removable plates 5E, through
50
Fig. 4 is a fragmentary sectional View of the
which part 45 passes, as shown in Fig. 3.
hollow, rotatable element per se, entirely removed
An operating rod 58 is in connection with the
from association with the remaining parts of
parts just described, through the medium of a
the switch.
holder 6I) formed of non-conducting material and
This application is a continuation in part of
when the level of liquid 44 rises to a point where
my co-pending application, Serial No. 517,626, 55
3
2,407,571
it is against part 46, current may flow from con
to the brush to close and open the switch while
the brush is on each of the relatively short con
tact member 36 through element 40, liquid 44,
part 46, yoke and barrel 43 and 50 respectively,
and brush 52 to plate 28, if the parts of the
tact plates.
2. In an intermittent switch of the kind de
scribed, an elongated stationary contact mem
ber; a series of relatively short contact plates; a
be so numbered and arranged as to cause the
brush movable across the faces of the said con
level of liquid 44 to engage part 46 only immedi
tact plates; a hollow rotatable element of con
ately after brush 52 has reached the surface of
one of the contact plates 28, 30, 32 or 34. Like~ lO ducting material in constant contact with the
elongated contact member having an axially dis
wise, as the entire assembly, controlled by rod
posed
part of conducting material in connection
58, is moved in the direction of the arrow, the
with the said brush and insulated from the ro
level of liquid 44 should drop away from part 46
tatable element; and current conducting liquid
immediately before brush 52 leaves any one of
Iin the hollow element and in contact therewith,
these several contact points. In so doing, the
said element being formed to cause the level of
brush and contact plates will be spared the detri
the liquid to shift to and from a point against
mental efi‘ect of arcing and clean surfaces may
the said part while the brush is on each of the
always be maintained in the switch.
switch are in the position shown in Fig. 2.
CR
In constructing element 40, pockets 42 should
The form of element 40 and member 24 is such
that no slipping can occur between the areas
thereof that are in contact, and therefore, when
the switch is timed with regard to the level of
liquid 44 and the disposition of pockets 42, the
circuit will always be closed at the proper instant
while brush 52 is upon one of the contact plates.
The specific form of pockets 42 may be altered
as desired and to suit conditions. Mercury has
been found satisfactory as a liquid current con~
ducting medium, and also as a liquid which will
quickly leave part 46 as element 40 is rotated.
As illustrated in Figs. 2 and 4, the level of the
liquid 44 when three pockets 42 are receiving the
volume thereof, is high enough to contact part
46, but when parts of more than three pockets
are below the level
drop, as illustrated
and therefore, open
may be introduced
relatively short contact plates.
3. In an intermittent switch of the kind de
scribed, an elongated stationary contact mem
ber; a series of relatively short contact plates; a
brush movable across the faces of the said con
tact plates; a hollow rotatable element of con
ducting material in constant contact with the
elongated contact member having an axially
disposed part of conducting material in connec
tion with the said brush and insulated from the
rotatable element; and current conducting liquid
in the hollow element and in contact therewith,
said element being formed to cause the level of
the liquid to shift to and from a .point against the
said part while the brush is on each of the rela
tively short contact plates, said elongated con~
tact member and the hollow rotatable member
of liquid 44, that level will
in Fig. 4, to leave part 46
the circuit. This liquid 44
having interengaging surfaces to preclude slip
ping between the intercontacting areas thereof.
into element 40 by merely
scribed, an elongated stationary contact member;
4. In an intermittent switch of the kind de- ’
removing one of plates 56 for the same are re
a series of relatively Short contact plates; a brush
movably attached in place by screws or analogous 40 movable across the faces of the said contact
means 6U.
plates; a hollow rotatable element of conducting
The manner of employing the intermittent
material in constant contact with the elongated
switch and one preferred way of constructing the
contact member having an axially disposed part
same has been made clear during the course of
of conducting material in connection with the
the specification, and since alterations may be
said brush and insulated from the rotatable ele
made without departing from the spirit of the
ment; and current conducting liquid in the hol
invention, it is desired to be limited only by the
low element and in contact therewith, said ele*
scope of the appended claims.
ment being formed to cause the level of the liquid
Having thus described the invention,` what is
to shift to and from a point against the said part
claimed as new and desired to be secured by Let
while the brush is on each of the relatively short
ters Patent is:
contact plates, said elongated contact member
1. A switch of the kind described comprising
being a rack, said rotatable member being a gear
an elongated stationary contact member; a se»
in mesh with the rack.
ries of relatively short, spaced apart contact
5. A switch of the character set forth in claim
plates; a brush disposed to move across the faces
2, wherein the hollow rotatable member is pro
of the several plates of the series one at a time;
vided with a series of internal radial pockets to
a rotatable hollow element in constant contact
receive the liquid as the member is turned about
its axis.
with the elongated contact member and in elec
trical connection with the said brush; and a fill
6. A Switch of the character set forth in claim
ing of current conducting liquid in the hollow 60 2, wherein the hollow rotatable member is pro
element, said hollow element having its interior
vided with a series of radial pockets to receive the
formed to raise and lower the level of the con
current conducting liquid, said Ipockets being ar~
ducting liquid as the element is rotated over the
ranged to raise the level of the liquid against the
axially disposed part only when the brush is on
relatively long contact member, the switch being
closed when the liquid level is raised to a prede
one of the relatively short contact plates and to
termined point and being opened when the liquid
lower the level of the liquid to a point spaced
from the said part when the brush is between the
falls below said predetermined point, said hollow
contact plates.
element being formed and disposed with respect
MILO F. MILLER.
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