Патент USA US2006195

June 25, 1935.
H, J_ (300K
2,006,195
ELECTRIC PULL CHAIN SOCKET
Filed Jan. 27, 1931
3 Sheets-Sheet l
w
(a
<@
Q
‘Q
INVENTOR
Harmon J. Cook.
BY H15 ATTORNEY
June 25, 1935.
H J_ COOK
2,906,195
ELECTRIC PULL CHAIN SOCKET
Filed Jan. 27, 1931
3 Sheets-Sheet 2
‘é?
"UM
INVENTOR
Harmon J Cook.
BY HIS ATTORNEY
7944M
June 25, 1935.
2,006,195
H. J. cooK
ELECTRIC PULL CHAIN SOCKET
Filed Jan. 27, 1931
5 Sheets-Sheet 5
INVENTOR
Harmon J. Cook
BY
ATTORNEY ?‘
Patented June 25, 1935
2,006,195
UNITED STATES PATENT OFFICE
2,006,195
ELECTRIC‘ PULL CHAIN SOCKET
Harmon J. Cook, Torrington, Conn.
Application January 27 , 1931, Serial No. 511,523
11 Claims.
(Cl. 173-354) ‘
Fig. 3 is a top plan view looking downward
This invention relates to electric switches and
circuit breakers, and more particularly to an elec upon Fig. 2.
Fig. 4 is a transverse sectional view, taken along
tric pull chain socket switch of the “hill and val
ley” type, which will be capable of carrying and the line 4-4 of Fig. 1, looking downwardly.
Fig. 5 is a transverse sectional view taken along 5
5 interrupting quite heavy loads without danger of
the line 5-5 of Fig. 1, looking upwardly.
injurious arcing or ?ash-overs.
Fig. 6 is a perspective view in separated rela
One object is to provide a pull chain socket
switch of the intermittently operated ratchet tion of the insulating cap, the movable contact
type, in which the rotary contact carrier will be carrier, the spring-operated ratchet and asso
10 telescoped within the stationary contact base ciated parts.
10
Fig. 7 is a top plan view of the rotary contact
whenever the switch is in the fully open or fully
closed position.
carrier.
_
Fig. 8 is a perspective view of one of the sta
A further object is to provide a pull chain sock
et switch of the above nature, in which the rotary tionary contact members whichv is formed inte
contact carrier is provided with a pair of down grally with the center contact of the screw shell
wardly projecting inclined lugs for supporting the socket.
Flg. 9 is a perspective view of the other sta
two sides of the rotary contact, said lugs being
adapted to snap below the upper surface of the tionary contact member.
stationary contact base for ?lling the space sur
20 rounding the contacts.
A further object is to provide a pull chain sock
Fig. 10 is a perspective view of one of the pairs
of cap-supporting conducting brackets.
Fig. 11 is a bottom view of the insulating base
et switch of the above nature in which any are member.
Fig. 12 is a top plan view of the same.
which may be started by the separation of the
Fig. 13 is a perspective view of the same.
Fig. 14 is a. diagrammatic development view of
tween said contacts which blots out all of the air the cooperating contacts with the rotary contact
space, restricts the arc path, and cools the con member shown in “on” position.
Fig. 15 is a similar view with the rotary con
ducting gases.
A further object is to provide a pull chain sock tact member advancing to “off” position.
Fig. 16 is a similar view with the rotary con
et switch of the above nature which will be ca
pable of safely carrying and interrupting a cur tact in “off” position.
An arc, as generally understood, consists of
rent three to four times as great as was possi
ble with the former air-break type of socket a stream of charged particles passing through an
open space in the form of a tube or core sur
switch using the same size of metal contacts.
contacts will be instantly checked and destroyed
25 by the interposition of an insulating barrier be
35
A further object is to provide a device of the
rounded by luminous gas. The are continues to
above nature which will be simple in construction, carry current as long as‘ the central portion re
having only a fraction of the number of parts mains hot enough to maintain the flow of charged
as compared with the previous standard type of particles. It can be ruptured and destroyed by
stretching it, cooling it, or obstructing it. In
sockets of this general nature.
the
present improved form of pull chain socket,
A further object is to provide a pull chain
the arc is immediately checked by interposing
socket of the above nature which will be inex an insulating cooling barrier between the inter
pensive to manufacture, compact, ornamental in rupted contacts, whereby it will be completely
appearance, and very efficient and durable in use. smothered and extinguished. The obliteration of
With these and other objects in view there has the arc is partly due to the fact that the open
45
been illustrated on the accompanying drawings spaces about the contacts are completely ob
one form in which the invention may be conven literated. Under these conditions, the arc is im
iently embodied in practice.
mediately cooled and choked off and simply can
In the drawings:
not exist as there is nothing to support the con
Fig. 1 represents a vertical sectional view, par ducting stream of charged particles forming the
50
tially broken away, of the electric pull chain sock arc.
Referring now to the drawings in which like
et switch.
Fig. 2 is a fragmentary sectional view of the reference numerals denote corresponding parts
same, taken along the line 2—2 of Fig. 1, the throughout the several views, the numeral It]
5 switch being shown with the circuit closed.
indicates a stationary contact-carrying insulating
2
2,006,195
base member which is substantially cylindrical of upturned lugs 38a for ?tting into slots 3812
in shape and preferably formed of porcelain. The at the base of the lugs 34 and 35, whereby said
base member ID is provided with a central socket movable contact member as will be caused to
II extending downwardly into its upper face He! move with said rotary carrier 22. Surrounding
is an annular depressed socket Illa
and within which is mounted the lower end of the boss
a cylindrical pin I2 extending upwardly and having its base provided with a plurality of
terminating in an upper square head I3 having
a slot I4. By means of this construction the pin
may be adjusted whenever desired. The head I3
10 of the pin I2 is seated within a square socket |3a
raised inclined serrations, similar to a face
ratchet, and providing four connected abrupt
shoulders (it and cam sections All and 1112. The
lugs 3i and 35 have abrupt shoulders 39 at their 10
in an upper insulating cap member I5 also outer extremities which are adapted to abut
formed of porcelain and having a cylindrical tightly against similar abrupt shoulders 4c of the
opening I6 at its center for permitting a screw {four equally spaced serrations described above,
driver to be readily inserted in the slot I4 of when the switch is in the “on” and “oil” posi
15 the head I3. The head I3 may thus be depressed tions;
'
below the socket |3a and twisted 90 degrees with
. The two opposed inclined sections 4| are left
in a cylindrical chamber IBa in eitherfdirection blank so as to form insulating seats for the mov
for adjusting the tension of a coiled spring 'I'I able contact extremities 3'! and 38 when the
surrounding the pin I2,
- V
switch is in the “oil” position, while the other
‘
20
The coiled spring IT has a vertical upper ex two inclined sections ‘it? are provided with in
tremity I8 seated in an aperture I9 in the head clined stationary contacts 63 and [M for engag
I3, the lower extremity of said spring 'I‘I being ing the extremities of the movable contact 36
horizontal and connected with an upstanding lug when the switch is in the “on” position. By
28 of a ratchet 2|. The ratchet 2| is adapted means of this construction, it will be seen that
to lie in flat contact with the top of a rotary con positive insulating barriers are interposed be [5 Ci
tact carrier 22, preferably formed of a “phenol tween and around each set of movable and sta
condensation product” or other similar insulat tionary contacts, eliminating all air space which
ing material. The ratchet 2| is provided with might support an arc and instantly cooling and
an enlarged upper inclined radial wing 23 for breaking any arcs which may initially form at
30
guiding a switch-operating bead chain 24, the the interruption of the circuit.
iii)
inner extremity of which is detachably locked
The contact 43 leads directly to one of the
within a slotted eye 25 depending from one side line conductors through an angular supporting
of said wing 23.
'
T
'
bracket 45 connected to the base I l as by a screw
‘ ‘
The bead chain 24 is also guided by the outer
circular periphery 24a of the rotary vcontact car
rier 22, from which it passes tangentially at a
slight upward incline through a ?ared tubular
outlet bracket 26 having its lowerv end seated
in a slot 26a of the stationary base‘ III.v The
40. bracket 26 passes outwardly through ‘an outer
45 and having a lateral binding post in located
near the upper end thereof. The bracket A5 is
also provided at its top with a horizontal eye
lug 68 for receiving a screw 69 extending down
through the upper insulating cap I5. The
bracket 4'5 has a base 5i] provided with a tapped
hole 5| to receive a screw
which passes 40
enclosing metallic shell 21 within which is‘an through a lateral aperture ?ll) cf the stationary
insulating lining 28, as clearly shown in Figs. 1 contact 43‘, thus securely fastening said contact
and 4.
'
I
'
'
The ratchet member 2| is provided with four
downwardly inclined lugs 29 adapted‘to ‘engage
in a similar number of inclined socketsj3? pro
43 and bracket 45 to the base iii.
A similar supporting bracket member 52 is
connected at its lower end to a screw shell 52a 45
by means oi‘ a conducting screw 53, and has an
vided in the top surface ‘of ‘the rotary contact upper eye lug 553 similar to the eye lug ‘it for re
carrier 22, as shown in Fig. 7. ‘The ratchet2| ceiving a screw 55 for connection with the base
is adapted to index said carrier 22 ‘ one quarter
Ill.
of a circumference with each actuation of ‘the
similar to the binding post Ill.
pull socket chain 24.
i
'
‘
The bracket 52 also has a binding post 56
50
> '
Current is supplied to the switch through a
The spring I‘I'is arrangedto press thevrotary suitable twin-wire conductor cord 5?, which is
contact carrier 22 downwardly upon the-stations adapted to pass through an upper metallic shell
ary base member ID at all times'and is :also 58 and comprises a pair of insulated wires 59 and
adapted to return said carrier to its initialposi 60 which are connected to the two binding posts 55
tion after each operation of the switch. The 41 and 56, respectively.
rotary contact carrier 22' is provided’ on‘its under
The stationary contact 44 is provided with an
face with a central socket‘ 3| partially enclosed integral inwardly-extending resilient tongue 6|
by a pair of curved opposed ribs 22a'for receiving forming the central contact of the socket, said
the central portion of the contact member 36 tongue 6i being adapted to cooperate with the 60
and adapted to ?t over an annular boss 32 in center terminal of a lamp {Slot or other current
the stationary base In surrounding the socket consuming or conveying device wln'ch may be
II. The socket 3| has a central aperture '33,.for driven into the screw shell 52a.
permitting said carrier 22 to rotate freely and
The stationary contact 44 is connected to the
slide up and down upon the pin I2. The ribs tongue El by a depending integral strip 92 pass
22a serve as additional barriers to prevent arc ing through an aperture 53 in the base I0, said
ing between the central portion of said rotary strip 62 being attached to the underside of said
contact 36 and the stationary contacts 43 and 44; base It) by a screw 61% and nut I55. The tongue
Extending downwardly from the rotary carrier 6| is adapted to be pressed upwardly against
22 are a pair of curved inclined lugs 31 and 35 the bottom surface of the insulating base It by
which are adapted to form supports for a two the lamp 6| a and is shielded against flashing
part integral ‘contact member 35 having inclined over upon the upper inturned part 66 of the
outer extremities 31 and 38 adapted to lie loosely screw shell 52a by a downwardly-extending U
in engagement with the inclined lugs 34 and 35. shaped rib 6i formed integral with said base It
The contact member 36 is provided with a. pair and surrounding the sides of said tongue ‘IN.
2,006,195
3
plurality of , abrupt shouldered inclined cams
' Operation
In operation, assuming the switch to be in the
‘closed position, when the switch-actuating bead
chain 24 is pulled, the rotary carrier 22 will rise
on the inclined stationary contact members 43
and 44 in the sockets 42 of the base ll, causing
the two extremities 31 and 38 of the movable
contact 36 to ride off the upper ends of the sta-l
tionary contacts 43 and 44. The compressive
IO
force of the spring I‘! will then come into action,
causing the carrier 22 to snap down suddenly,
bringing the movable contact extremities 31 and
38 into the inclined sockets 4|. The shoulders
15 39 and 40 will then lie in abutment with each
other and the rim of the carrier 22 will lie ?at
upon the upper surface of the base N. All open
spaces will thus be ?lled, causing any arcs which
may have started to ?ow between the contacts,
20 to be instantly lengthened, cooled and extin
adapted to support said arms and fit against
said recesses, said carrier having a depending
annular flange forming a barrier to prevent arc
ing between the central part of said rotatable
contact member and said stationary contacts, and
means for rotating said carrier, the telescoping
arrangement of said carrier and base and the
inter?tting of said cams in said recesses serving
to obliterate the open air space and prevent the 10
formation of arcs.
3. In an electric switch of the rotary type, an
insulating stationary base having an annular de
pressed groove formed in the upper face thereof,
the base of said groove having a plurality of
ratchet depressions, stationary contacts seated
in alternate depressions, an insulating rotary car
rier member having a plurality of depending
abrupt shouldered cams shaped to ?t said ratchet
depressions, said carrier having a rim extending
guished.
outwardly beyond said cams for engaging the
When the chain is released, the ratchet 2| will surface of said base, a bridging member having
be restored by the torsional action of the spring a pair of contact arms supported on the cams of
I‘! to its initial position, ready for again snapping
on the switch.
‘
said carrier, and means depending from said
carrier inside of said cams for interposing an arc
One advantage of the, present invention lies in
barrier between said movable and stationary con
the fact that when the tension in the chain 24 is
tacts.
released, there is no danger of having the same
4. In an electric switch of the rotary type, an
come into contact with “live” parts of the switch, insulating stationary base having an annular de
because
all
such
parts
are
completely
enclosed
by
30
pressed groove formed in the upper face thereof, so
insulating barriers as described above.
the base of said groove having a plurality of
While there has been disclosed in this speci
ratchet depressions, stationary contacts seated
?cation one form in which the invention may be
in alternate depressions, an insulating rotary
embodied, it is to be understood that this form carrier member having a plurality of depending
35 is shown for the purpose of illustration only, and
that the invention is not to be limited to the
speci?c disclosure but may be modified and em
abrupt shouldered cams shaped to ?t said ratchet :2
depressions, said carrier having a rim extending
outwardly beyond said cams for engaging the
bodied in various other forms without departing
surface of said base, and completely covering
from its spirit. In short, the invention includes said groove, a bridging member having a pair
all
the
modi?cations
and
embodiments
coming
40
of contact arms supported on the cams of said
within the scope of the following claims.
carrier,
and means depending from said carrier
Having thus fully described the invention, what
inside of said cams for interposing an arc barrier
is claimed as new, and for which it is desired
between said movable and stationary contacts.
to secure Letters Patent, is:
5. In an electric switch of the rotary type, an
1. In an electric switch of the rotary type, an
insulating stationary base having an annular de
45 insulating stationary base having an annular de
pressed groove formed in the upper face thereof,
pressed groove formed in the face thereof, a plu the
base of said groove having a plurality of in
rality of abrupt shouldered inclined recesses in
said groove, stationary contact members arranged clined ratchet depressions, stationary contacts
seated in alternate depressions, an insulating
50 in alternate recesses, a rotatable contactor mem
rotary carrier member having a plurality of de
ber having inclined arms to intermittently pass
pending abrupt shouldered inclined cams shaped
over said stationary contact members, an insu to ?t said ratchet depressions, said carrier hav
lating carrier for supporting said contactor mem ing a rim extending outwardly beyond said cams
ber and having telescoping relationship with said for engaging the surface of said base, a bridging
55 base, said carrier having a plurality of abrupt member having a pair of contact arms supported
shouldered inclined cams adapted to support on the cams of said carrier, and means depending
40
45
50
55
said arms and ?t against said recesses, said car
rier having a rim outside of said cams for engag
from said carrier inside of said cams for inter
posing an arc barrier between said movable and
ing the surface of said base in overlapping re stationary contacts.
60 lationship, and means for rotating said carrier,
6. In an electric switch of the rotary type, an 60
the telescoping arrangement of said carrier and
base and the inter?tting of said cams in said insulating stationary base having an annular de
recesses serving to obliterate the open air space pressed groove formed in the upper face thereof,
the base of said groove having a plurality of
and prevent the formation of arcs.
2. In an electric switch of the rotary type, an ratchet depressions, stationary contacts seated in
insulating stationary base having an annular de alternate depressions, an insulating rotary car 65
pressed groove formed in the face thereof, a rier member having a plurality of depending
plurality of abrupt shouldered inclined recesses abrupt shouldered cams shaped to ?t said ratchet
in said groove, stationary contact members ar depressions, said carrier having a rim extending
ranged in alternate recesses, a rotatable con outwardly beyond said cams for engaging the sur
70
tactor member having inclined arms to intermit face of said base, a bridging member having a pair
tently pass over said stationary contact mem
of contact arms supported on the cams of said
bers, an insulating carrier for supporting said carrier, means depending from said carrier inside
contactor member and having telescoping rela of said cams for interposing an arc barrier be
tionship with said base, said carrier having a tween said movable and stationary contacts, and a
75
4
2,006,196
ratchet member having toothed engagement with inclined contact extremities adapted to bridge said
stationary contact members, and an insulating
said carrier for rotating the same.
7. In an electric switch for a light socket, an carrier ior indexing said rotary contact member,
insulating base having a centrally depressed annu said carrier having a rim located in flat surface
lar recess, the base of said recess having a plurality
of inclined cams located therein, said cams having
engagement with said base
10; In an electric pull chain socket switch, an
abrupt shoulders, stationary contacts resting on insulating base having a plurality of spaced. shoul
alternate cams, a rotatably insulating carrier hav dered circumferential cam depressions formed
ing face engagement on its periphery with the therein, said depressions having end shoulders, in
10 rim of said annular recess, said carrier having clined contact members being arranged in alter 10
cam projections having abrupt shoulders project nate. depressions of said base, a rotary contact
ing down into said annular recess, contact mem member having a pair of connected inclined. con
bers on alternate cam projections for cooperating tact extremities adapted to intermittently engage
with said stationary base contacts, and ratchet said stationary contact members, and an insulat—
15 means connected to said carrier for operating the ing carrier for said rotary contact member tele 15
scoping with said base having shoulders for en
8. In an electric switch of the rotary type, an gaging the shoulders of said depressions to obliter
insulating stationary base having an annular deq ate the air space and form barriers for preventing
pressed groove formed in the upper face thereof, the formation of arcs, said carrier having a rim for
same.
'
I
20 the base of said groove having a plurality of
ratchet depressions, stationary contacts seated in
alternate depressions, an insulating rotary down.
wardly spring-'pressed carrier member having a
plurality of depending abrupt shouldered» cams
25 shaped to ?t said ratchet depressions, said carrier
having a rim extending outwardly beyond said
engaging the surface of said base.
A, 11, In an electric switch, a rotary contact mem
20
her having a pair of connected inclined contact
terminals, an insulating carrier having a pair of
inclined shouldered backing-up cam lugs for sup
depending from said carrier inside of said cams
porting said terminals, and insulating base mem 25
ber having a plurality of spaced inclined shoul
dered recesses, stationary contacts located in al-.
ternate recesses of said base member for cooper
ating withsaid rotary terminals, means for index
ing'said carrier, and spring means for forcing said 30
for interposing an arc barrier between said mov
carrier into telescoping engagement with said base
cams for engaging the surface of said base, a
bridging member having a pair of contact arms
supported on the cams of said carrier, and means
member When the switch is in fully opened Or fully
9. In an electric pull chain socket switch, an closed position to prevent arcing, said carrier hav
able and stationary contacts.
insulating base having a plurality of inclined cam ing a pair of depending curved ribs located inside
35 recesses formed therein, alternate recesses being of said backing-up lugs to form additional barriers 35
provided with stationary contact members, a ro against arcing.
tary contact member having a pair of connected
HARMON. J. COOK.