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Патент USA US2112510

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March 29, 1938.
Filed Feb. 6, 1936
l ,
Patented Mar. 29, 1938
yJohn M. Wiuhammeaemcago; 111.
Application February c, 193s, serial No. 62,651
1 claim, (01.*173-35'4)
My invention relates to switch sockets.
One of the objects of my invention is to provide
an improved switch socket in which a unit com
prising the switch mechanism and lamp contacts
5 is readily removable and lreplaceable with respect
to a wiring base inthe casing.
With such a
construction, if any part `of the unit, including
the switch mechanism, goes wrong this unit may
be easily removed by anyone `whether or not they
10 are familiar with wiring electrical devices and
a new unit may be substituted for the defective
Further objects and advantages of the inven~
tion will appear from the description and claim.
In the drawing,
Figure 1 is an axial section through a lamp
socket disclosing an embodiment of my inven
Fig. 2 is a perspective view of >part of the socket
20 interior.
Referring to the drawing in detail, the con
struction shown comprises a sheet metal cap I
having a bushing 2, secured thereto, which may be
screwed onto a conduit 3, or the like, through
which the feed wires 4 extend, a sheet metal shell
5 forming a casing member detachably secured
to the cap in any suitable manner well known in
the socket art, an insulating lining 6 of libre, or
any suitable material, an upper insulating .disc ‘I
30 having a quick detachable connection with the
cap I, wiring terminals 8 for the feed wires 4
mounted on this upper disc 1, quick detachable
contacts 9 also mounted on this disc 'I, seated in
recesses therein and electrically connected with
35 the wiring terminals 8, a second insulating disc
Il? underneath this first disc 'I having blade-re
ceiving openings therethrough, through which ex~
tend contact blades I I and IIa into engagement
with the contacts 9 on the upper insulating disc,
40 a third insulating disc I2 underneath the sec
ond insulating disc and spaced therefrom, the
second and third discs being secured together and
properly spaced together by means of three metal
stamping members I3, I4, and I5, a pull switch
45 mechanism I6 mounted between the second and
third bases Il) and I2, for controlling the elec
trical connection between one of the contact
blades IIa and the center contact I‘I of the lamp
socket, a shell contact I8 mounted on the lower
50 insulating disc, a chain guide or horn I9 detach
ably secured to one of the three metal stampings,
and a pull chain 2U secured to the chain rail 2I
of the switch mechanism and passing through the
chain guide I9.
The second and third insulating discs I0 and
I2, the‘three stampings I3, II4,~an.d I5, which con
nect them and space them-.from each other,` the
switchmechanism ILS, and `theshe'll and center
contacts |58 and I‘I `are made up as lafunitary
structure which can easily'be :removed and »re- si?
placed with :respect to Vfthe upper insulating disc
and the >parts carried thereby, simply by ldiscon
necting the casingshell 5 from the cap l and «sep
arating .the removable unit by withdrawing fthe
blades I I and -I Ia from >engagement with the con- l‘älî
tacts .9 on the wiring base.
A'I'he'upper insulating disc f7 is detachably -se
cured‘to the cap by means of a pair of leaf spring
members ‘22 ihaving?latching portions which en
gage suitably positioned recesses in the upper lsäl
insulating disc 7. The three metal `stamping
members are provided with shoulder portions 23,
24, and 25 lying substantially in the same hori
Zontal plane which engage cooperating shoulder
portionson the second` insulating disc >Iffâ to posi- 20
tion vand space the second and third discs with-re"
spect to each other. The second disc may be se
cured to the stampings by means of screws 26 ex
tending through openings in the insulating disc
ID and threaded into tapped holes 21 in the 25
horizontally extending portions of the stampings.
The stamping I3 of which the contact blade II
is a part is secured to the lower insulating disc
and electrically connected with the shell contact
by means of a screw 28 extending through an in- 30
wardly extending flange on the shell contact I8,
through an opening in the insulating disc l2 and
an opening in the foot portion of the stamping I3
and threaded into a nut 29 lying above the foot
portion of the stamping. The stamping I4, of 35
which the contact blade I la, is a part, is secured
on the insulating disc and held in engagement
with one of the switch contacts by means of a
screw 3U (Fig. 2) extending through the insulat
ing disc i2 and through an opening in the base 40
portion of the stationary switch contact 3l and
threaded into the foot portion of the stamping
I4, the base of the contact 3| being clamped be
tween the foot portion of the stamping I4 and
the insulating disc I2. The other stationary con- 45
tact 32 of the switch is electrically connected
with the center contact I‘i of the socket.
For Amaking and breaking the circuit between
the two switch contacts 3l and 32, a rotatable
contact member is provided comprising an in- 50
sul‘ating disc 33 rotatably mounted on an axially
extending pin 34 and carrying a combined con
tact and ratchet member 35 having a bridging
piece comprising a pair of spring contact fingers
36 alternately moved into and out of engagement 55
with respect to the two stationary switch con
tacts 3| and 32. This insulating disc 33 and the
ply by disconnecting the casing shell 5 from the
bridging piece carried thereby are given a 90°
out of engagement with the contacts 9 on the wir
step-by-step movement by means of the switch
actuating lever or disc 31 which is oscillatably
ing base.
mounted on the axially extending pin and carries
a driving ratchet member 38 for cooperation with
the driven ratchet member on the bridging piece.
any special skill and does not involve any wiring
operations so that there is no danger of improper
The chain rail 2| is secured to the periphery or
10 this disc 31, the pull chain 20 being secured to the
chain rail and having a portion lying in the arcu
ate channel portion of the chain rail in a manner
well known in this art, the chain passing from
this chain rail through the chain guide I9. A
15 suitable torsion return spring 39 is provided for
the step-by-step actuating disc 31 to return it
through its 90° movement when the pull chain
is released.
In operating the switch, a pull on the chain 20
20 will move the switch lever or disc 31r through an
angle of a little more than 90°. This will impart
a corresponding movement to the insulating disc
33 which carries the bridging piece on which the
spring contact iingers 36 are formed. If the
25 switch is in “on” position to start with-in which
position the contact fingers 36 are in engagement,
respectively, with the stationary contacts 3| and
32-the 90° movement will cause the contact iin
gers 36 to snap off from the edges of the contacts
30 3| and 32, respectively, to break the circuit at
two points in series. This of course turns the
switch off. To turn the switch on, the chain is
again pulled to give a 90° movement to the bridg
ing piece, causing the spring contact fingers 36
35 to ride up the inclines 40 on the insulating base
|2 and finally to snap oiî from the abrupt edges
of these inclines 40 into engagement with the
stationary contacts 3| and 32, thus again estab
lishing the circuit.
As indicated above, if anything goes Wrong
with the removable unit, it can be removed sim
cap I and slipping the contact blades Il and lla.
A new unit can then be substituted.
This removal and substitution does not require
wiring in making replacement.I ,
Further modifications will be apparent to those
skilled in theV art and it is desired, therefore, that 10
the invention be limited only by the prior art
and the scope of the appended claim.
Having thus described my invention, what I
claim and desire to secure by Letters Patent is:
A switch socket construction comprising a ñrst 15
insulating disc, shell and center contacts mounted
thereon, a second insulating disc spaced from said
first disc and having a pair of blade passages
therethrough, a“ pair of metal stampings each
having an integral foot portion secured to said 20
ñrst disc and each having an integral blade por
tion extending through one of the blade passages
in the second disc, a switch mechanism mounted
between said discs, one side of the switch being
electrically connected with the center. contact 25
and the other side being electrically connected
with one of said stampings and the other oi said
stampings being electrically connected with the
shell contact, a third insulating disc above said
second disc having wiring terminals thereon, conm
tacts for quick detachable engagement and dis
engagement with respect vto said bladesr also
mounted on said third disc, said stampings hav- . f
ing integral shoulder portions thereon engaging
said second disc for supporting and spacing it 35',
with respect to said first disc, a casing /for said
socket, and resilient means cooperating tween
said casing and said third disc whereby said disc
is removably retained in said casing.
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