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Патент USA US2136859

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Nov. 15, 1938.
E. MICHEL
2,136,859
CIRCUIT CHANGING SYSTEM
original Filed' May 7, 193e
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2,136,859
Patented Nov. 15, 1938
UNITED STATES PATENT OFFICE
2,136,859
CIRCUIT CHANGING SYSTEM
Edmond Michel, New Orleans, La., assigner to
Larmloc Corporation, New Orleans, La.
Original application May 7, 1936, Serial No.
78,504. Divided and this application June 17,
1937, Serial No. 148,807
8 Claims. (Cl. F75-375)
The present invention relates to an improved
circuit changing switch system and is a division
under Oñicial requirement of my copending ap
plication Serial No. 78,504, ñled May ’7, 1936.
An essential object of the invention consists
in providing a circuit changing system including
a switch having a relatively fixed contact with
which is associated a movable contact for the
purpose of normally establishing an electrical
circuit with an operable member. The movable
contact is in turn operatively associated with a
key or plug contact whereby upon the engagement
of the key Contact with the movable contact to
cause disconnection of the fixed contact from the
movable contact and simultaneously to establish
a circuit between the key contact and the mov
able contact. Additionally, means are provided
for automatically returning the movable con
tact to engagement with the fixed contact upon
withdrawal of the key contact from engagement
with the movable contact.
A further object comprehends the provision
of a circuit changing switch mechanism which
may be readily associated with various types of
electrical devices or systems and which is par
ticularly applicable for use with electrical com
bination switches to change the combination of
the electrical circuits connected to the operable
members such as disclosed in my Patent No.
2,082,806, dated June 8, 1937.
Other objects and advantages of the invention
will become apparent from the following descrip
tion when taken in conjunction with the accom
panying claims and drawing.
Referring to the drawing, in which is shown
several preferred embodiments:-Figure l is a diagrammatic view with parts in
section showing my improved circuit changing
switch mechanism associated with a two push
button contact combination switch for actuating
an electro-magnet and an alarm device;
Figure 2 is an end view of the switch casing
with parts in section;
able insulated material such as Bakelite, hard
rubber or any other suitable composition, and
preferably comprises a recessed section II and
a removable top or closure I2 for permitting ready
access to= the interior of the section I I. The in
side of the section I I is formed with the upwardly
extending spaced partitions I3 and I4 (Figure
4) which align with complementary formed par
tition members I5 and I6 extending downwardly
from the inner wall of the cover I2.
The free
ends of the aligned partitions are spaced from
each other to form a. series of longitudinally dis 15
posed openings I1 and I8. Each of the register
ing openings I1 and I8 constitutes a support for
an electric conductive cylindrical member or rod
I9 which is reciprocably mounted in the casing
I0. Each of the rods I9 preferably comprises 20
an. enlarged portion or sleeve 20 arranged nor
mally to register with an aligned opening 2| in
the front face plate 22 (Figure 3) and a reduced
portion or stem 23 which projects through the
opening I8 and is connected to the wire 24 which
extends through the opening 25 in the rear face
of the casing so as to be electrically connected to
any suitable operable member. A coil spring 26
encircles the stem 23 and is confined between the
annular ñange or shoulder 2l on the sleeve 20
and the partitions I4 and I 6 so as normally to
urge each rod I9 to assume the position as shown
1n Figure 3 so that the outer ends of the mov
able contacts align with adjacent sockets 2|. A
fixed contact or conductive bar 28 preferably of
U shape (Figure 2) has its parallel arms 29 ex
tending substantially the length of the interior
of the casing so as to straddle the reciprocating
rods I9 in order that these arms may be engaged
by the shoulders 2l.
One side of the casing I9 40
may have a recess or groove 30 in the inner wall
thereof for "receiving the connecting arm of the
U-shaped contact 28 so as to maintain the same
Figure 3 is a plan view of Figure 2 with por
tions of the cover cut away for clearness of illus
in a fixed position within the casing I0. The
arms 29, it will be observed, are arranged to be
tration;
engaged by opposite portions of each of the
Figure 4 is a sectional view taken substantially
along the line ß-ll of Figure 3, and
Figure 5 is a diagrammatic view of the circuit
changing switch mechanism associated with a
urged into engagement with the fixed contacts
by the springs 26, means are provided for in 50
suring a positive and uniform Contact between
single push button Contact combination switch.
these parts.
Figure 6 is an enlarged sectional view of the
push button switch mechanism.
Referring to the drawing, in which like nu
.Cl CA
I0 designates a casing which is shown as of elon
gated form but which obviously may be of any
desired shape. The casing I0 is made of any suit
merals indicate like parts in thel several views,
shoulders 21 so that when these shoulders are
The arms 29 are connected by the terminal
screw 3| to a wire 32 _which in turn is connected
to any suitable source of electrical energy such
55
2
2,136,859
as a battery or the like which will subsequently
be described.
A removable contact key or plug 33 preferably
has an enlarged head or shoulder 34 arranged to
ñt into a complementary keyhole slot or socket
35 in the face plate 22 of the casing. The key
contact 33 is electrically connected to any suit
able operable member by the wire 36. The key
33 is detachably connected to the casing upon
the insertion of the shoulder 34 into the socket
35 and the subsequent turning of the key so
as to bring the shoulder 34 into engagement with
the inner wall of the casing. Manifestly, the
shape and size of the key 33 and ysocket 35 may
be varied depending upon the shape of the cas
ing IU and the form of the fixed and movable
contacts I9 and 28, respectively.
Any number of reciprocating contacts I9 may
be employed corresponding to the number of
circuits with which the device is associated. It
will be seen that normally when the key 33 ’is
withdrawn from the casing III, the :spring -26
causes the axial movement of the >reciprocating
rod I9 to move the flange or collar 21 Iinto en
gagement with the arms of the fixed contact -28
to close a predetermined electrical circuit. Upon
the selective insertion of the key 33 in anyone
of the openings 2I (Figure 4), the outer end of
the key abuts against the adjacent end of the
movable contact I9 and forces the same in
wardly against the tension of the spring 126 Ato
disconnect the engagement of the collar 2'I with
the fixed contact 28 and simultaneously estab
lishes a separate circuit between 'the lcontact key
323 and the reciprocating or movable contact I9.
Upon turning the key 33 either in a clockwise
or counter-clockwise direction, the shoulders or
lugs Sá are moved out of registration with the
slots 35 and abut against the inner wall yof the
il) face >plate so as vto detachably secure the ikey to
the casing. When it is desired 'to -break the
circuit between the key 33 and the Amovable rod
I9, it is merely necessary to withdraw the -key
33 from the casing. Upon >the withdrawal Aof
the key 33, the spring 26 causes the rod I9 "to
be moved axially and thus brings the collar f2.1
into engagement with the Vñxed contact 28 tore
establish the circuit which `had been previously
disconnected by the insertion of the ‘key within
the casing.
It will be seen that by reason of the novel ‘ar
rangement of parts a practical and y'foolproof
switch mechanism is provided for normally clos
ing a predetermined circuit »and for automati
cally disconnecting this circuit and establishing
another circuit upon the insertion of a contact
member within the casing, the original circuit
being immediately reestablished when the >con
tact member is withdrawn. Thus, the danger
ous and disastrous consequences which result
from the failure to properly disconnect a cir
cuit before connecting another circuitis avoided,
since the mechanism insures the automatic dis
connection of a predetermined circuit >immedi
ately upon the establishing of another circuit.
Moreover, the spring 26 acts to urge the mov
able contacts outwardly and in the Vdirection of
the sockets 2I in order to maintain the same
normally in contact and in engagement with
the ñxed Contact. This outward pressure serves
a double purpose. When the key ycontact is
inserted into the selected socket to disconnect
the movable contact from the fixed contact, a
slight pressure must >be exerted against the nor
vmal position `of spring 26 `by the key contact,
then the key contact is slightly turned in either
direction, and the pressure induced by spring
26 is transmitted to the outer end of the mov
able contact, which pressure is transmitted outWardly to the key contact and holds transverse
arms or lugs 34 securely tight against the inner
wall of face plate 22, and prevents the accidental
disconnection »of the key contact from the se
lected movable contact.
The top or cover I2 is detachably secured to 10
zthe casing by the screws 3'I to permit convenient
`access into the interior of the casing I0 for the
purpose of inspection or removal of the parts.
While the casing Ehas been described as pref
erably made of insulatable material, it will be
manifest `that by this is meant the parts of the
casing which constitute the supports for the
movable »contacts are of suitable insulatable
material in order to separate the fixed contact
andthe movable contacts and thus insure the 20
selective establishment of the separate circuits
with each -of the movable contacts.
While my improved circuit changing switch
mechanism is adapted for use in changing the
-combination of various types of electrical de
vices, I have, for the `purpose of illustration,
shown the same associated with a two button
combination switch for selectively controlling the
flow of current to means for actuating a door
lock or to a signalling device for indicating that 30
the switch mechanism is being tampered with
such as disclosed in my aforesaid Patent No.
2,082,806.
The switch 38 `is preferably in the form of a
casing panel 60 (Figure 6) and has mounted
therein a transverse web 6I of insulated material 35
to which may be threaded or otherwise con
nected a series of spaced fixed contacts 62 cor
responding in ~number to the `reciprocating con
tacts I9. A cover plate 63 closes the youter 'side
of the casing and has a plurality of openings 64 il.)
which «register with the 'adjacent fixed contacts
~62 and slidably carry the push buttons »or other
-suitable actuating means 65. A metallic plate
or'disc 66 secured to the underside »of the cover
v63 bya threaded bolt 6-1 «and nut 68 and vmay be
`spaced from the plate63 by an `insulating wash
-er 69.
The plate y(i6 Vis formed with a series of
spaced radially disposed flexible arms 'I0 corre
sponding in number to the fixed contacts 62.
The arms 'I0 A»are interposed between adjacent y
contacts A62 »and push buttons «65.
The plate
6E through its -arms ‘I0 constitute a movable
contact common to the fixed contacts 62 for
the purpose vof establishing predetermined -cir
cuits with the adjacent ñxed contacts. The
plate 66 is preferably formed of flat flexible
Ametal so that ‘when each‘of the arms 'I0 vis dis
placed by a push button 65, it will bebrought in
Yengagement with its adjacent ñxed vcontact V62,
and will upon the release -of the push button 60
>be returned to its normal horizontal position
so as not to be detrimentally affected, by con
stant usage.
The arms ‘I0 are normally spaced
Airom'the »fixed contacts 62 while thebolt 6'I serves
as means for establishing an electrical .connec
tion between the movable contact 66 and an
operable member in a manner as will be subse
quently described.
As shown in Figure l, the lcircuit changing
switch mechanism is provided -with‘eight 4recipro
cating contacts I9 corresponding in number to
the number of push ‘button contacts carried by
the combination switch 38. Assuming that in
lthe vtwo :button combinationswitch `the'means I
75
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2,136,859
and 'I have been selected to be the contacts neces
sary to be actuated in order to cause the opera
tion of the electro-magnetic means 39, which
controls the movement of the wedge member 39’
associated with the lock or bolt 4U, and that the
remaining buttons 2, 3, 4, 5, 6 and 8 are arranged
to control the electrical connection to the alarm
4I. In such an event, each of the Wires 24 lead
ing from the reciprocating or movable contacts
10 I9 is connected separately to one of the fixed
or bolt 40, the plug 33 connected to the magnet
39 through wire 36 is inserted within the opening
2l with which aligns the reciprocating member
I9 connected to the fixed contact 62 associated
with the push button I, while the other recipro
eating contacts I9 will be maintained by their
spring 26 in engagement with the stationary con
tact 28 as the wire 36 associated with the push
button 'I (Figure l) connected to the battery 44
is now dispensed with, the said battery 44 is l()
contacts 52 of the double switch 38, and the
fixed contact 28 is connected by the wire 32 to
the positive side of the battery 42.
,
The plug or key contact 33 which> is inserted
15 through the opening 2l of the casing I0 in the
circuit of the reciprocating contacts I9 connected
to the ñxed contact 62 associated with the push
button I, establishes a connection between op
erable member 39 and the said fixed contact
20 through the wires 24 and 36, while the plug
contact 33 inserted in the circuit of the other
reciprocating contact I9 connected with the fixed
contact 62 associated with the push-button 'I,
is connected by its wires 24, 38 and 43, battery
25 44 and wire 45 with the other side of the operable
member 39. Consequently, when the push-button
contacts I and 'I are simultaneousls7 displaced to
bring the arms 'I3 of the movable contact 66 into
engagement with their adjacent ñxed contacts
30 62, there is established an energizing circuit be
tween the operable member 38 and its source of
energy. A switch or relay 46 may be interposed
in the circuit for controllingl the same at a remote
point. The remaining iixed contacts associated
35 with the push buttons 2, 3, 4, 5, 6 and 8 are con
nected on one side through the reciprocating con
tacts I9, fixed contact 28 and wire 32 with the
battery 42, which in turn is connected by the
wire -II to one side of the magnet 49, while the
movable contact 63 is connected through the bolt
61 and the wire 48 with the other side of the
magnet 49. Thus, it will be seen that if anyone
of the push buttons 2, 3, 4, 5, 6 and 3 is displaced,
it will immediately close a circuit to the magnet
49 which in turn will actuate the relay 5I) to move
the same into engagement with the contacts 50
and 5 I, thus energizing the alarm 4I to notify the
proper authorities that the switch is being tarn
pered with.
It will be seen that when my circuit changing
switch is associated with a combination switch
such as 38 for selectively controlling the supply
of current to two or more operable members such
as the magnet 39 and the alarm 4l, that the two
selected contacts establish a circuit with one of
the operable members such as 39 while the re
maining contacts are in circuit with the other
operable members. Further, the combinations
may be easily changed by pulling out the plugs
33 from the sockets I and 1 and reinserting them
in other selected sockets. Manifestly, the number
of contacts employed may be varied depending
upon the purpose for which the circuit changing
switch is to be used. The switch structure shown
. in Figure 6 is substantially similar to the yswitch
mechanism embodied in my copending applica
tion Serial No. 68,124, filed March 10, 1936.
The circuit changing switch is equally adapted
for use with a single button combination or a
dual control combination. As shown in Figure 5,
70 a single push button switch combination is dis
closed for effecting the selective control rof the
operable members. Assuming that the push but
75
ton I and its associated fixed contact 62 have
been selected to control the actuation of the lock
now connected to bolt 6l by line 48 in order to
establish a circuit connection through the plug
contact 33 connected to the individual ñxed con
tact associated with button I, through the posi
tive side of battery 44, line 45 to magnet 33, then 15
through line 36 and bolt 61 to the movable con
tact 66, (Figure 6) when the arm of the movable
contact G6 is moved in engagement with the fixed
contact associated with button I, then to plug
contact 33 thro-ugh line 24 and to the negative .20
side of battery 44 through line 43. The remain
ing contacts 2 to 8 inclusive are connected to
the alarm 4I in substantially the same manner
as shown in Figure 1. Thus, the removable con
tact 33 connected to magnet 39 may selectively 25
engage any one of the reciprocating' contacts i9
to move the same out of engagement with the
stationary contact 28 so that upon the actuation
of the push button associated with the individual
fixed contact 62 connected to the reciprocating :30
contact engaged by the plug‘contact, it will es
tablish a circuit connection between the arm of
the movable Contact 66 and the said fixed con
tact and close the circuit to effect the actuation
of the operable member 39.
The lock 40 and the alarm 4I constitute sepa,
rate operable members which may be selectively
connected to the movable contacts as desired.
The alarm 4I is normally connected to the mov
able contacts I9 through the fixed contact 29 and 3.40
the wire 32 while a lock 49 is selectively connected
to the same movable contacts through either the
key contacts 33 as shown in Figure l or the
single key contact shown in Figure 5. Hereto
fore, the key or plug contacts have been arranged ,
.to operate or energize operable members im
mediately upon the closing of the key circuit. It
is signiiicant to note that in the present inven
tion the operable members are not energized by
the selective connection of the key contacts with
the movable contacts but are only rendered oper
ative by the closing of the proper circuit through
the switch 38. The push button contacts l to 8,
inclusive, of the switch 38, therefore constitute
control members, each of which is permanently »,
and individually connected to one of the movable
contacts. I9 so as to selectively control the actua
tion of the operable members associated with
the electrical system.
It will therefore be seen that when the circuitV
changing switch mechanism is associated with
an electrical combination switch, the selected
combination for controlling the operable members
may be readily changed by withdrawing the plug
33 from its socket 35 and inserting the same in
any one of the other sockets so as to effect a
change of the combination necessary to actuate
the operable members 33 and 40 respectively.
Maniiestly, the circuit changing switch mech
anism may be operatively associated with vari
ous types of electrical devices for closing a prede- `
termined electrical circuit and automatically
opening said circuit and establishing another
circuit while disconnecting the previously con
nected circuit. The insulated casing >Il! and its
4
2,136,859
associated parts are very compact and may be
vconveniently vpositioned at Aany desired -point to
.effectïthe change ofthe circuits by the selective
’insertion of the plugs v33 into the sockets .35.
Itis to be understood that the forms of »the
invention shown and described are merely illus
trative of preferred embodiments and that such
changes may be made as fall within the purview
of one skilled in the art without departing‘from
the spirit of the invention and vthe 'scope of the
,appended claims.
I claim:
1. In va system of the class described, the com
bination of a control switch having spaced fixed
contacts, a contact having a plurality of movable
contacts associated with the fixed contacts and
normally spaced therefrom, means to bring the
>movable contacts in engagement with their asso
ciated iixed contacts, a source of electrical energy,
an electrically operable member, means inter
connecting the operable member to the movable
contacts, a circuit Aclosing mechanism including
reciprocating contacts, each of the reciprocating
contacts being permanently connected to one of
»the fixed contacts, and detachable contact means
connected to the source of energy and arranged
`selectively to engage any one of the reciprocating
contacts so that upon the actuation of the mov
able contact associated with the fixed contact
connected to the reciprocating contact engaged
by the detachable contact means, to establish a
circuit connection between the movable contact
and the detachable contact means to actuate the
voperable member.
2. In a system of the class described, the com
bination of a control switch’having spaced ñxed
contacts, a contact having a Yplurality of mov
able contacts associated with the fixed contacts
Aand normally spaced therefrom, means to bring
40 the movable contacts in engagement with their
associated ñxed contacts, a source of electrical
energy, an electrically operable member, means
interconnecting the operable member to the
lsource ofenergyga circuit closing mechanism in
45 cluding reciprocating contacts, each of the re
ciprocating lcontacts being permanently con
nected `to one of the fixed contacts, detachable
'Contact means connected to the operable mem
ber and the source of energy, said detachable
'50 means arranged selectively to engage any one of
the reciprocating contacts so that upon the lselective actuation of the movable contact associated
with the fixed contacts connected to the recipro
cating contacts engaged by the detachable con
tact means, to establish a circuit connection
through'the said detachable means to actuate'tlie
operable member, a stationary contact, means
for normally maintaining each of the recipro
eating contacts in engagement with the station
60 ary contact, a second operable member, means
connecting the second operable member to the
movable contacts, a second source of electrical
energy, means connecting the stationary contact
.to the second source of energy so that upon the
actuation of any of the movable contacts >asso
ciated with the ñxedcontacts not connected with
the reciprocating contacts engaged by the de
tachable contact means, to establish a circuit
connection between the movable-contact andthe
stationary contact to actuate the second oper
able member.
3. In a system of the class described, -the com
bination of .a control switch 'having spaced fixed
contacts, a contact having a ,plurality of mov
able contacts associated with Athe :fixed contacts
and normally spaced therefrom, means to bring
‘the ~movable contacts in engagement with their
’associated fiixed contacts, a source of electrical
energy, an electrically operable member, means
inter-connecting the operable-member to the
source of energy, .a circuit closing mechanism in
cluding vreciprocating contacts, each of the re
ciprocating contacts being permanently con
nected to one of the ñxed contacts, a pair of de
tachable plug contacts, means connecting one 10
of ‘thesaid plug contacts to one side of the oper
able member, means .connecting the other plug
contact to the source of energy, each of the plug
acontacts `arranged selectively to engage any one
of the reciprocating contacts rso that upon the ,
:selective actuation of the movable contacts asso
ciated with :the fixed contacts connected to the
`reciprocating contacts engaged by the two plug
contacts, to establish a circuit connection between
‘the said plug contacts to actuate the operable
member.
4. In a -system ofthe class described, the com
bination of a Acontrol switch having spaced fixed
contacts, ‘a 'contact ‘having a plurality of mov
la'bl‘e ¿contacts associated with the ñxed contacts
îand `normally spaced therefrom, means to bring
Àthe movable contacts in engagement with their
Aassociated -ñxed contacts, a source of electrical
energy, an electrically operable member, means
inter-connecting -the operable member to the '30
~source'of energy, a circuit closing mechanism in
cluding reciprocating contacts, each of the re
ciprocating contacts being permanently con
nected to one of the fixed contacts, a pair of de
tachable -plug contacts, means connecting one of
Ithe said 'plug Ycontacts to one `side of the oper
'able member, 'means connecting the other plug
Vcontact to the source of energy, each of the plug
contacts arranged selectively to engage any one
of the reciprocating contacts so that upon the
selectiveactuation of the movable contacts asso
ciated with the fixed contacts connected to the
`reciprocating contacts engaged by the two plug
contacts, to l'establish a circuit connection be
tween ’the said plug contacts to actuate the oper
îa'ble member, a stationary contact, means for
’normally maintaining each of ‘the reciprocating
contacts yinengagement with the stationary con
tact, a second operable member, means connect
in‘g'the `second >operable `member to the movable .
contacts, a second source of electrical energy,
means connecting 'the stationary contact to the
vSecond source of energy so that upon the actua
‘tion ‘of any one ofthe movable contacts associ
ated with vthe'fixed contacts `not connected with ,
the :reciprocating contacts engaged by the two
'plug contacts, to establish a circuit connection
’between the movable contacts and the stationary
contact'to actuate the second operable member.
5. In a system of the class described, the com
.binati'onio‘f a control switch having spaced fixed
contacts, afcontact having a plurality of movable
'contacts associated with the fixed contacts and
Vnormally spaced therefrom, means to bring the
movable contacts 'in engagement with their asso
ciated 'fixed‘contacts a source of electrical energy,
an electrically `operable member, means inter
connecting the operable member to one side of
the source of energy, a circuit closing mechanism
includingreciprocating contacts, each of the re
ciprocating contacts being permanently con
nected to one of the fixed contacts, a pair of de
tachable plug contacts, means'connecting one of
said Iplug Vcontacts to one side of the operable
member, means connecting the other plug con- y
5
2,136,859
tact to the source of energy, each of the plug con
tacts arranged selectively to engage any one of
the reciprocating contacts so that upon the simul
taneous actuation of the two push buttons asso
Ul ciated with the ñXed contacts connected to the
reciprocating contacts engaged by the two plug
contacts, to establish a circuit connection through
the plug contacts and the movable contacts to
effect the actuation ci the operable member.
10
6. In a system of the class described, the com
bination of a control switch including spaced
ñxed contacts, a contact having movable contact
arms registering with adjacent fixed contacts and
normally spaced therefrom, means to bring the
15 arms of the movable contact in engagement with
their adjacent fixed contacts, a source of electri
cal energy, an operable member, means inter
connecting the operable member to one side of
the source of energy, a circuit closing mechanism
20 including reciprocating contacts, each of the re
ciprocating contacts being permanently con
means associated with said arms for moving the
same in engagement with their adjacent ñxed
contacts, a source of electrical energy, an elec
trical operable member, means interconnecting
the operable member to the source of energy, a
circuit closing mechanism including reciprocat
ing contacts, each of the reciprocating contacts
being permanently connected to one oi the ñXed
contacts, and a detachable plug contact con
nected to the operable member and arranged 10
selectively to engage any one of the reciprocating
contacts so that upon the actuation of the arm of
the contact associated with a fixed contact con-
nected to the reciprocating contact engaged by
the plug contact, to establish a circuit connection
between the arm of the contact and the plug con
tact to actuate the operable member.
8, In a system of the class described, the com
bination of a control switch including spaced ñxed
contacts, a contact having a plurality of contact 20
arms, each of said arms registering with` adja
cent ñxed contactsV and normally spaced there
nected to one of the ñxed contacts, a stationary
contact, means for normally maintaining each of
from, means to bring the arms of the contact in
the reciprocating contacts in engagement with the
stationary contact, a second operable member,
a source of electrical energy, an operable member,
a second source of electrical energy, means con
necting the second operable member to the mov
able contact, means connecting the stationary
contact to the second source of energy, a pair
30 of detachable plug contacts, one of the said plug
Contacts being connected to the operable mem
ber and the other plug contact being connected
to the source of energy, each of the plug con
tacts arranged selectively to engage any one of
the reciprocating contacts so that upon the simul
taneous actuation of the arms associated with the
fixed contacts connected to the reciprocating con
tacts engaged by the two plug contacts, to estab
lish a circuit connection through the plug con
40 tacts and the movable contact to effect the actu
ation of the operable member, the moving of any
one of the other arms to engage its associated
ñxed contact, acting to close the circuit between ,
the stationary contact and the movable contact
to effect the actuation of the second operable
member.
'
7. In a system of the class described, the com
bination of a control switch having spaced ñxed
contacts, a contact having a plurality of contact
arms, each of said arms registering with adjacent
ñxed contacts and normally spaced therefrom,
engagement with their adjacent fixed contacts,
means interconnecting the operable member to
a source of energy, a circuit closing mechanism
including reciprocating contacts, each of the re
ciprocating contacts. being permanently con
nected to one of the fixed contacts, a stationary
contact, means for normally maintaining each
of the reciprocating contacts in engagement with
the stationary contact, a second source of elec
trical energy, a second operable member, means
connecting the second operable member to the 35
contact, means connecting the stationary con
tact to the second source of energy, a detachable
plug contact connected to the first operable mem
ber and arranged selectively to engage any one of
the reciprocating contacts so that upon actuation 40
of the contact arm associated with the fixed con
tact connected to the reciprocating contact en
gaged by the plug contact, to establish a circuit
connection between the contact arm and the plug
contact to effect the actuation of the operable 45
member, the actuation of any one of the other
Contact arms being operable to close the circuit
between the stationary contact and the movable
contact to effect the actuation of the second
operable member.
50
EDMOND MICHEL.
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