US1290644A

US1290644A - Burglar-alarm system and apparatus therefor.

Info

Publication number: US1290644A
Application number: US7496216A
Authority: US
Inventors: Theodore H Nelson
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-01-29
Filing date: 1916-01-29
Publication date: 1919-01-07
Anticipated expiration: 1936-01-07

Description

. T. H-'. NELSON. BURGLAR ALARM SYSTEM AND APPARATUS THEREFOR.

APPLICATION FlLED JAN.29-. me.

1,290,644. I Patented Jan. 7,1919. 3 SHEETS-SHEET l1 re WSO Q wag T. H. NELSON.- v 'BURGLAR ALARM SYSTEM AND APPARATUS THERE'FOR.

ARPLICATMN FILED M29. 1916; 1,290,644.

s SHEETS-SHEET 2.

aw/hier- JZeodare%%d507M ,Pafehfed-Jan. 7, 1919.

T. H. NELSON. BUR GLAR ALARM SYSTEM AND APPARATUS THEREFOR.

APPLICATION FILED JAN-29. 1916 Patented-Jan. 7,1919.

THEODORE H. NELSON, or CHICAGO, rumors.

. BURGIiAR-ALARM sYsrEM AND APPARATUS THEREFOR.

To all whom it may concern." I

Be'it known that I, THEODORE H. NELSON,

a citizen of the United States, residingat Chicago, in the county of Cook and State of Illinois, have invented a new and Improved Burglar-Alarm System and Apparatus Therefor', of which the following is a specification.

My invention relates to an improved burglar alarm system designed particularly to protect an outer doorway which must be used to secure access to the system, and it is an object'of my invention to provide circuit connections and controlling mechanisms so that by properoperation of the controlling mechanism by an authorized person the system is temporarily disabled so'that the door may be opened 'without ringing the alarm. It is a further object of my invention to automatically return the signaling system to its, set condition by the subsequent closing of the door. While my system is applicable to burglar alarms it is also applicable to other-purposes in which it is desired to control an electric circuit so that bythe operation of the controlling mechanism in a predetermined manner the circuit is maintained in one condition; whereas the improper manipulation ofthe controlling mechanism leaves the circuit in anothercondition. Thus, for example, in a burglar alarm system the alarm circuit may be normally open and the proper operation of my controlling mechanism maintains said circuit in its open condition notwithstanding the operation of the alarm contacts, or the burglar alarm system may have a normally closed circuit which is maintained in its closed condition by the proper operation of my controlling mechanism when the alarm contacts are actuated subsequent to said operation of the controlling mechanism. Or-

again, other circuits may be similarly con-- trolled, such, for example, as the ignition circuit of an automobile so that the ignition c1rcuit remains open even though the usual key switch'be closed until the controlling mechanism characterizing my invention is actuated in the required manner.

The several drawings illustrating my invention are as follows:

Figure 1 is a diagrammatic drawing showing my system applied to an open circuit burglar alarm system,

.Fig. 2 shows in a new similar to 1 Specification of Letters Patent.

- Application filed January 29, 1916. Serial 110. 751,962..

Patented J an. '7, 1919.

the-application of my system to a closed circuit burglar alarm system,

Fig. 3 shows in a view similar to Figs. 1 and 2 the application of my system. to the ignition circuit'of an automobile,

Fig. 4 shows in a vertical sectional view the detail construction of the controlling mechanlsm,

Fig. 5 shows the controlling mechanism in I front elevation,

Fig. 6 shows the controlling mechanism in rear elevation with the casing removed, and Fig. 7 shows the controlling mechanism in :front elevation with the front plate removed.

Similar numerals refer to similar parts throughout the several views;

Since the operation of my system depends in large part upon the controlling mechanism employed, I will first describe this mechanism referring particularly to Figs. 4, 5, 6 and 7. In these figures the casing 10,- which is cylindrical in form, is secured by screws as indicated to the front plate 11 which supports by a plurality of posts. 12

the insulating disk 13 which constitutes the support for the contacts 14: and conducting ringl5, these contacts and conducting ring being located on the front side of the disk. The front plate 11 has extending rearwardly from it a centralboss 16 in which a cylindrical rod 17 is mounted so as to be freely rotatable. The inner end of therod 17 has mountedupon it a contact blade 18 which is secured in place between a collar 19 and nut 20 carried by said rod. One end of the contact blade 18 is arranged to engage the contact ring 15 and the otherend of said blade is arranged to engage desired ones of the contacts 14, the conducting ring and contacts being in different planes sothat the contact engaging end of the contact blade does not engage the conducting ring. In

- formed therefor in the front. plate 11. The

flange 24 has projecting rearwardly from it a' pin 25 for entering the holes 26 formed in the front plate to permit the dial to be as a result of the cocperation of the pin 25 with the corresponding one of the holes 26,

' to the rear to close the circuit controlled the selected contact.

the dial may be pushed rearwardly against the action of the spring21 tobring the contact bladef18. into engagement w1th the selected contact 14' and at the same time with the conducting ring 15'w'hich serves'to electrically connect the .selected contact with said conductingring. The pin 25serves to prevent holding the dial 22 in its rearward position and sWeeping'the contact blade over the contacts one after the other and necessitates angular adjustment of the dial to a desired position before the dial can be moved Since the controlling mechanism described is of necessity. located on the outside of the room or building protected by. the alarm system and therefore accessible to any one who desires to operate it, I provide against tam- 'pering with the system by the -removal of the front plate in an attempt to disable the system by providing the

safety springs

27 and 28 on the r'earfaceof the disk 13, which springs in an open circuit system are nor- I mally separated from each other by the en-.

gagement ofan insulating plug 29' carried r I glar alarm. The contact 58 of the burglar by the spring 28 with the inner wall of the casing 10 so that when' the front plate 11 and the parts carried thereby are removed from the casing the

springs

27 and 28 come together, closing the desired circuit, in a manner to 'be explained. Similarly for .a

closed circuit control system the safety springs are normallyheld in contact with each other as indicated in Fig. 2, and for this construction when the front plate isremoved the contact springs27 and 28* separate from each other opening the controlled circuit and giving the alarm.

In Fig. 1.1 have shown an application of my controlling mechanism to an 0 en circuit burglar alarm system, the controlling mechanism already described being provided with relay mechanism for controlling the alarm circuit, which relay mechanism forms a part ofthe control system whether used for an 50 open'circult or a closed circuit burglar alarm,

or Whether used for any other circuit control. In this figure the wire 30 is connected with a desired one of the contacts 14 and also to one terminal of the winding of the relay 31, the other terminal of which is con nected with the negative terminal of battery other terminal of which is connected with the negative terminal of battery 40, the other terminal of which battery is connected with the common conductor 33. The wire 38 is also connected with the armature 41 of the relay '39, and wire 42 is connected with another desired one of the contacts 14 and with a second armature 43 of the relay '39; which armaturec'ooperates with a make-contact. 44 connected by'wire 45mm an armature-46 of relay 47, which relay is constructed so as to be sluggish, in operation for a purpose to be described. .The wire 45 is also connected with a break-contact 48 of the armature 49 of relay 50. The armature 49 is connected with one terminal of the winding of the relay 47, the other terminal of which is connected with the'negative terminal of bat tery 51, the other terminal of said battery being connected-with the common conductor 33. The negative terminal of the battery 51 is also connected with a-second armature 52 of relay 47, which is provided with'a makecontact 53'connected by wire 54 with a second armature 55 ofthe relay 50. The wire 54 is also connected withone terminal of the winding of the relay 50, the other terminal of'said winding being connected b' wire 56 with-one of the door contacts 57 o the burengagement with the contact 60 serving to 4 move the contact 60 away from the contact 61 with which it is normally in engagement. The-contact 61 is connected by wire 62 with make-contacts 63'. and 64 of

armatures

34 and 41 respectively. The contact 60 is connected by wire 62% with the contact of armature r .of relay Rand the armature r. is connected by-wire 88 with the common conductor 33. with a make-contact '65 connected with the negative terminalof battery 66, the other terminal of which is connected withthe com- 'mon conductor 33. ,A release wire 67 is connected w1th one or more-of the contacts 14 The armature 55 is provided as desiredand also to one terminal of the winding of relay R, the other terminal of;

said winding being connected'to the negat1ve terminal of the battery B; the-other with one terminal.v of the battery 76 and one terminal of the bell 77 respectively, the other terminals of the battery and bell'being connected-together, as a result of which when the drop 1s actuated the bell circuit is closed and itcontinues to ring an alarm until the drop is restored to its normal position shown in Fig. 1. with abreak-contact 78 connected by wire 79 with a third armature 80 of; relay 50.

The armature 80 is provided with a breakcontact 81 connected by wire 82 withfone of the contact springs 83 of the door mechanism, the cooperating spring 84 being connected with wire 56. The door has secured to it a plate 85 carrying a plug 86 which engages the spring 58 when the door is closed and separates said spring from the spring 57. A conducting plug 87 separate and insulated from the plate 85 is provided for engaging the springs 83 and 84 when the door is in its closed position, this plug being suitably mounted on the door casing so that it may occupy an outer position away from the springs 83 and 84 when the door is open and thus prevent ,closin the alarm circuit by the springs 57 an 58. Closing the door serves to move the plug 87 between the contacts 83- and 84, .thus' conmeeting them so that-a subsequent opening The armature 68 is provided of the door closes the alarm circuit by the engagement of the

springs

57 and 58 since the plug 87 remains between and in contact with the springs 83 and 84 and thus electrically connects them. The door contact, springs and the operating mechanism described constitute a part of the subject matter of my Patent Number 1,127,916, issued February 9, 1915, and therefore requireno further illustration or description. The wire 69 may be extended if desired to the controlling mechanism and connected with an otherwise disconnected one of the contacts14 so that an unauthorized person tam pering with the controlling mechanism and pressing the dial rearwardly in a position corresponding to the contact with which the Wire 69 is connected will operate the alarm.

As a result of the connections described and assuming that the

wires

30, 35 and 42 are connected respectively with the contacts 14 which are numbered 2, 5 and 7 on the dial plate and that the

wires

69 and 67 are connected with the contacts 14 designated 9 and 3, 6 and 8 respectively on the dial plate, the operation of the system is as follows: The. relays 31, 39, 47, 50 and R are normally denergize'd, as a result of which if the plug 86is removed from the contact'spring 58 a circuit is closed through the winding of the drop -71 as followszbattery 72, winding 71, wire 69, switch 70, armature "68, contact 78, wire 79, armature 80, contact 81, wire 82, contact spring 83, plug 87,-contact spring 84, spring 57, sprlng' 58, wire 59, wire 73 back to battery 72. This closes the bell cir-- I cuit and the alarm is sounded. To tempos rarily disable the alarm circuit so that closure of

thesprings

57 and 58 will not operatethe alarm circuit just traced, a person desiring to enter the door first rotates the dial to the indication 2 and presses it rearwardly, which connects the conducting ring with the contact marked 2. As a result of this, since the common conductor 33 is connected with the contact numbered 14 and in turn with the conducting ring 15,

a circuit is closed as" follows: battery 32,

wire 33, contact marked 14, conducting ring 15, contact blade of controlling mechanism,

contact marked 2, Wire 30, winding of relay 31, .back to battery 32. As a result the

armatures

34 and 36 are attracted and the relay 31 ismaintained in energized condition through the following locking circuit: battery' 32, wire 33,- wire 88, armature 1, wire 62', contact .60, contact 61, wire 62, contact 63, armature 34, winding of relay-31, back to battery 32. After depressing the dial in the position marked 2 with the results described, which of course occur as soon as the circuit is closed, the dial ispermitted to move to. its outer position and is rotated to the position marked 5, and again pushed

armatures

41 and 43 are attracted and a locking circuit for the relay 39 is closed as follows gbatter'y 40, wire 33, wire 88, armature 7", wire 62, contact 60, contact 61, wire 1 62, contact 64, armature 41, winding of'relay 39 back to battery 40. The operator now v releases the dial and rotates'it to the position marked 7, and again press'es'the dial rearwardly, which connects the contact marked 7 with the'conducting ring 15, and thus electrically connects wires. 33 and 42 and closes the following circuit: battery 51, wire 33, wire 42, armature 43, contact 44, wire-45, contact 48, armature 49, winding of relay 47 back to battery 51.- As a result the armature 46 is attracted and closes a locking circuit for the relay 47 before separating the contact 60 and 61, this locking circuit being-as follows: batter 51, wire 33,-

wire 88, armature 1', wire 62, contact 60,

armature 46, wire 45, contact 48, armature 49, winding of relay 47, back to battery 51.

The separation of the contacts 60 and 61 opens the locking circuits above traced for the relays 31 and 39 as a result of which it will appear that the relay 47 is locked in energized condition before the-relays 31 and 39 are released by the opening of their locking circuits. Besides closing a locking circult for itself the energization of the relay -47connects the battery 51 with the winding of the relay so that' said relay may. later be energized, and by attractin the armature 68 the energization of .t e 'relayf-47 opens the alarm circuit above traced through the ,windingof the drop 71 and thus provents-"the energization of the drop as long as the relay 47 is ener 'zed. For this con-- dition of the relay 4 the door may be opened without danger of closing the alarm same he has access to theswitch by which he may cut off the alarm circuit before again opening the door and when he desires to leave, the' conducting plu 87 is withdrawn, the cut-off switch 70 lsc osed. and the door is shut with the result that the alarm circuit is not "closed by this operationfor the reason that the sp'rm'g 58 is removed from I engagement with the spring57 slightly in advance of the engagement of the contacts 83 and 84 by the plug 87. The connection of the release wire 67 with desired ones of the contacts 14 results in energization of the relay R if the dial isdepressed in either of the positions marked 3, 6 and 8 for the connectlons indicated in Fi 1, since if the dial is depressed. in either 0 these positions the

wires

33 and 67 are electricallyconnected 1n the controlling mechanism. This ener- 'giz'ation circuit 1s as follows battery B, wire33 through the controlling mechanism 'to,wi re'67, winding ofirelay R back to batcircuit and when so opened the removal'of the plug 86 from the contact spring 58 closes the following circuit :bat-tery 51, wire 33, wire 59, spring 58, spring 57, wire 5,6,

. winding of relay 50, wire 54, contact'53,

armature 52,.back to battery 51. The energization of the relay 50 attracts'thegarmatery B. As a result of the energization of r away from its contact t e locking circuit the relay and the movin of the armature through the'relays' 31 and39 is opened and these-relays are restored to their normal rendition, and if for this condition the switch. of the controlling mechanism is ture 49 and thus opens the locking circuit. above,;traced1for the relay 47, but since the .relay 47 isof the slow acting type, the armature 52' doesnot leaYe the contact 53.11ntil after lthe armature 55 of the relay 50 has been. brought into engagement with the contact 65 to'furnish a retainlng circuit for the moved into position to connect the

wires

33 and 42 the relay 47, will not be energized smce'the armature 43 is awa firom its con- I relay 50 as follows; battery .66, wire 33, wire 59,, contact 58, contact 57, wire'56, winding of relay 50, armature 55, contact 65, back to battery 66; The relay 50 is thus maintalnedfin energized condition as long as the springs 57 land 58 remain in engagement with, each other, or in other words, as long as the dooris 0 on, and for this condition the armature 8O lsattracted away from the contact 81, this operation having taken place before the armature 68 returned into engage-' I I ment with the contact 78 and thus the ener- 50 isenergizedw When the door is closed 1 the

springs

57 and 58 are separated, thus gizing circuit .of the drop 71is maintained 1n inoperative conditlon aslong as the relay tact. Similarly if prior to t e energization' of the relay R the relays 31 39 and 47 have been energized and thus the relay 47 has been locked in its actuated position the energiz'ation of the relay IRv opens the locking circuit of .therelay 47, restoring it'to its;

normal condition. It therefore follows that whether one, two or all of the relays 31, 39

and 47. have been energized prior to'the' en-' .erglza'tion of the relay R, this operation of the relay R. restores or releases such of the 'relays'31, 39 and 47 as may have, been energized' and' held in locked condition. The

safety springs 27 and 28 are connected rejspectively by wires 89 and 90 with

Wires

33 and 69, asa result-of which if it be attempted to remove the 'controllin mechanism from its casing 10 a circuit 13 closed 'opening the locking circuit of therelay 50,

which thereupon returns to its normal condition and the controlhng system is again ready for operation.- A means is thusfprovided for opening the door without-actuating the a arm, provided the controlling .mechanism is properly manipulated whic I 60 can only be done, by an authorized person who knows the combination,- the effect being the same as though the'operation of a combination lock were required to open the door 1 without actuating'the alarm. When a person passes through thedoor and closes the through the drop 71 as above described for o eration of the controlling mechanism in t e. position marked 9. and the alarm is sounded. While I have shown but two relays 31 and 39 which must be operated in sequence before it is possible to operate the relay 47, it will be understood that a greater number of such relays may be employed if controlled in Fig. 1 by the derstood that the entire system may be operated from one battery if desired, such an arrangement being shown in the modified system shown in Fig. 2, which is similar to the system shown in Fig. 1, with the exception that the alarm circuit is normally closed instead of being normally open. In this modified construction the

relays

31, 39, 47, 50 and R are similarly constructedand operated through

wires

30, 35, 42 and 67 from the controlling mechanism, the principal difference being that a single battery 91 is employed, to one terminal of which the common conductor 33 'is connected and to the other'terminal of which acommon conductor 92 is connected, which in turn is connected by

wires

93, 94, 95, 96 and 96 with the windings of the relays 31, 39, 47,

contact 65 and winding of relay R respectively instead of thesimilarly connected bat terie's 32, 40, 51, 66 and B as shown in Fig.-

1. In this modification the bell 77 has one terminal connected by wire 97 with the common conductor 33 and the ,contact7 5 is connected by 'wire 98 with the other common conductor 92, the shutter 74 of the drop be ing connected with the other terminal of the bell 77.

In'this modification the alarm circuit is different from that above described in that it is normally closed and 'must be broken in order to operate the alarm. This alarmi circuit maybe traced as follows: battery 91, wire 92, wire 93, safety spring 28, safety spring 27, wire 94' to winding of drop 71,

cutoff switch 70, wire 95, wire 96,'contact spring 57, contact spring 58, .wire 97, wire 98, wire 33 back to battery 91. The contact 84 is connected with the contact 57 and the contact 83 is connected with the contact -58" through wlre 97. In this. modification the, plug 87 is of insulating material and normallyprevents contact between the springs 83 and when the door' is closed, for which position of the door the plug 86 maintains the spring 58 in engagement with the spring 57. When plug 87 a is withdrawn the springs 83*? and 84 engage each. other, thus maintaining the drop energized so that the removal of the plug 86 from the spring 58 w1l l not operate the alarm. The cutoff swltch is provided with analternate contact 99 connected by wire 100 with wire 33,

the contacts of this switchbeing close enough together so that one ismade beforethe other is broken in the operation of the switch in order that the circuit through the energiz ing winding of the drop 71 may remain closed while the switch is being moved from one position to the other. In this modification the

armatures

68 and 80 of the relays 47 and 50 respectively cotiperate with makecontacts 78- and 81 connected together and 1 by wire 101 with common conductor 33, the

armatures 68* and 80 being connected to w1re 96. As a result of the circuit connections described the energization of either the relay 47 or 50, by attracting the armature 68 a or 80, as the case may be, maintalns the alarm circuit in closed condition, or in other words prevents-the operation of the alarm which is the same result as is described for the system shown in Fig. 1 for the energization of the relays 47 and 50. The separation of the safety springs 27 and 28 from each other in the modified construction shown in i Fig. 2 opens the alarm circuit, thus ringing the alarm so that for this modification pro tection maybe secured against tampering.

with the control mechanism in substantially the same manner as described above for the system shown in Fig, 1.

In the modified system shown in Fig. 3 my controlling mechanism is adapted to control the ignition circuit of. an automobile shown diagrammatically in this figure of drawings. In this modification the secondary winding 105 of the-induction coil 106- has one of its terminals connected by Wire 107 with the distributing switch 108 the contacts 109 of which are connected by wires 110 with the spark plugs 111 of the several cylinders of the engine, the casing 112 of which is connected by wire 113 with the other terminal ofthe secondary ,windin 105. The primary winding 114 of the 1n uction coil 106 has one of its terminals connected with the vibrator 115, the other terminal of the primary winding being connected by wire 116 with the contact 117 of the control switch 118. The contact 119 of the vibrator mechanism is connected by Wire 120 through switch 121 with one terminal of the battery 122, the other terminal of which battery is connected by wire 123 with the switch 118. The switch 121 may be of any desired kind and preferably represents a key operated switch well known in the art,

-which provides'that the switch may only be cally controlled by my control mechanism.

This control mechanism as herein employed consists of the relays 31 and 39 operated by thecontrol mechanism 124 in precisely the manner described above for the relays 31 and 39. Battery current is supplied for the operation of the relays 31 and 39 through the

common conductors

92 and 33 from the battery 122 .in the same manner that current is supplied to the relays 31 and 39 from the battery 91 in Fig. 2. The switch 118 is pivotally mounted at 125 and 1s provided 'with a slot 126 through "which a pin 127 projects, said pin being carried bya rod 128 constituting the core of the solenoids 129 v and 130. The terminals of the-winding of the solenoid 129 are connected by wires 131 and 132 with the common conductor 92 and the contact 44 of the armature 43 respec- 1 tively. The terminals of the winding o'f the 'so1enoid'13O are connected by'wire's'133 and 134mm a desired one of the contactsof the controlling mechanism 124 and with the common conductor 92? respectively. The

contacts

63 and 64?. cooperating with the armatures 34? and 41 are connected together by wire 62 and to the vcontact 135, which is in engagement with thecontact spring 136 when the ignition circuit is open at the switch 118. The contact136 is connected by wire 137 with the switch pivot 125. The contact spring 136 tends at all times to move from engagement with, the contact spring 135 and when these contact springs are in engagement with each other they are held in such position by a pin 138 engaging the contact spring 136, said pin being carried by the rod 128. .The rodf128 is supported so as to move freely in the

solenoids

129 and 130 by suitable non-magnetic guides 139 and 140, the solenoids, the switch 118 and the 140 is scour 1n casing through which {wall an aperture is ormed in line with the rod 128, said a rcontact springs. 135 and 136 being. suitably mounted in' a closed: box inaccessible except to one havi 1 a key to said box. The ide :5 to, one wall [141 of the inclost'ure bein somewhatjsmalIer-Ithan the ore it or the'gulde 140'and' through thisaperture a I plug 142. ,projects having I an; 1 operating head on its'outer end and an enlarged head 40' p the solenoid/129. The switch 118 is pref-' on its inner end- .for retaining it in lace in e'rablyrovided with a retaining spring 143 i {,of the construction for hol ing itin itso en osition. Asaresult d esc'nbed after-the relays 31" and 39Ihavebeen operated in the manner. describednabov'e for-Figs. land 2 and the third-operating impulse is sent by thecontrolling'mechanism through wire 42 the solenoid 129. is energizedthrough the .'following circuit battery 122,. wire 92, wire 131, winding of solenoid; 129, wire 132, contact 44 armature'43 wire 42 through the controlling mechanism 124 to wire 33" and thus back to battery 122. This moyes the rod 128 to the right, thus moving the switch 118 in engagement with the contact 117 and closing the ignition circuit through the pri mary winding 114 of the'induction coil assuming that the key-operated switch 121 has been reviously closed. The movement of the1'rod 128 to the right as shown in Fig. 3' also permits the contact spring 1136- to move from engagement with the contact 135,

.thus opening the locking circuit of the relays 31 and 39 Theconstructio'n of the parts however, is such that the locking circuit is not opened until the-switch 118 is a spring 1.26

ing with the contact to which the wire 133 is connected and then pushing the dial to the rear as above described: battery 122, wire 92, wire 134, winding of'solenoid' 130, wire 133 through the'controlling mechanism 124 to wire 33 and thus back to battery 122. This serves to move the bar 128 to the l'eftas a result of which the'switch 118 is moved from engagement with its contact 117, and the ignition circuit is opened in which position; the switch and rod 128 are held by the spring 143. This same opera- 1 .tion moves the pin. 138 into' engagement with the contact spring 136, thus moving said spring into engagement with the contact 135, closing the locking circuitabove referred to forthe 'relays31" and.39". If

' referred the rod 128-may be moved to the eft to open the ignition circuit by means of the plug 142 without the use of the' 'controlling mehanism '124.

p As a result of'the construction above -de-- scribed itwill belob'served that bylmy invention I have provided controlling mecha-' nism' such that .a. plurality. of-deyices' must be operated in a predetermined sequencein order that a desired electric circuit maybe opened or closed as desiredby the operation of the controlling. system as awhol, and

furthermore that the switchin mechanism forminga' part of my controlli I mechanism affords a means for a plurality of positions, indicated numerically or otherwise, to which the switching mechanism must be moved in the predetermined sequence to properlyopcrate theelectrical part of the controlling dialmay either have numerals or letters or any other indicating characters-to guide in mechanism; It will be understood that; theselecting difi'er'ent conditions for operating. the controlling mechanism, and that these indicating characters may be placed in any I manner upon or around the dial. thatwill aflord a guide to locating the dial definitely in difi'erent angular positions. Fromthe above it will appear thatthe' controlling mechanismof my system may be called a combination control, for the reason that from a plurality of possible positions of the con-- trolling mechanism by which the operation of the system is initiated certain positions must be selected in predetermined order to properly secure the successive operations of operation may be changed as desired to meet varying conditions so that no two systerms may have the same combination. v

It will be understood in connection with the systems shown in Figs. 1 and 2 that the release wire 67 and therelay operated thereby may be omitted if desired as may also the ringing wire 69 and that other arrangements of controlling relays may be employed as long as it isnecessary to operate the controlling relays in predetermined order or relation to each other so that the circuit controlled by the system may be opened or closed as desired by the subsequent operation of another relay or electromagnetic device.

It will be understood that I do not limit myself in carrying out my invention to the particular embodiments above described as I may employ equivalents thereof without departing-from the spirit of my invention.

What I claim is: 1. A control system of the type described comprising in combination, an alarm circuit,

a plurality of electromagnetic devices, op-' operated to control the closure of said circ'uit only when said switching mechanism is moved successively to the several positions controlling I said devices in their predetermined sequence of operation and electric del vices controlled by said alarm circuit for giving an alarm.

2. A control system of the type described comprising in combination, an alarm circuit, a plurality of electromagnetic devices, operating circuits for said devices each controlled by the operation of a preceding one of said devices in the sequence of operation of said devices, contacts operated by the last one of said devices in said sequence of operation .for controlling the closure of said alarm clrcuit, a switching mechanism having a plurality of operative positions, one.

for operating each of said devices and other inoperative positions, whereby said devices are operated to control the closure of said circuit only when said switching mechanism 18 moved successively to the several positions controlling said devices in their predetermined sequence of operation, said switching mechanism comprising a circular dial, a

switch blade and contacts for engagement with said switch blade, said dial being movable in. one direction to select a desired con-. tact and in another direction to bring said contact blade into engagement with the selected contact and electric devices controlled by said alarm circuit forgiving an alarm.

3. A control system of the type described comprising in combination, an alarm circuit, a plurality of relays each controlling the operating circuit of another in a predetermined sequence, contacts carried by the last relay in said sequencefor controlling the closure of said alarm circuit, switching mechanism having contacts and operating circuits extending each from a desired one of said contacts to operate said relays, there being a greater number of said contacts than operating circuits whereby said switching mechanism must be selectively operated in predetermined sequence to select the contacts connected with said operating circuits to properly operate said relays in the necessary.

sequence to control the closure of the desired circuit and electric devices controlled by said alarm circuit for giving an alarm.

4. -A control system of the type described comprising in combination, an alarm circuit,

a plurality of relays each controlling the operating circuit of another in a predetermined sequence, contacts carried by the last relayin said sequence for controlling the closure of said alarm circuit, switching mechanism having contacts and operating circuits extending each from a desired one of said contacts to operate said relays, there being a greater number of said contacts than operating circuits whereby said switching mechanism mustbe selectively operated in predetermined sequence,to select the contacts connected with said operating circuits to" properly operate said relays in the necessary sequence to control the closure of the desired circuit, said switching mechanism COIIIPIfISIDg a rotary disk having a switch blade for engagement with said contacts and indicating characters for determining different angular positions of said disk and switch blade corresponding to the; several contacts, said disk bein movable axially to bring said switch bla e into engagement with a selected contact and electric devices controlled by said alarm circuit for giving erative; positions, whereby said devices are operated to control ,the'closure of said circuit only when said switching mechanism is giving an alarm.

' 4 mined sequence of operation, a. release circuit extending from said switchingmecha- "nism for restoring said electromagnetic devices to normal condition and-electric devices controlled by said alarm circuit for '6. A control system of the type described com rising in combination,an alarm circuit,

" a p urality of relays each controlling the operating circuit of another in a predetermined sequence, contacts carried by the last relay in said sequence for controlling the closure of said alarm circuit, switching mechanism having contacts and operating circuits extending each from a deslred one of said contacts to operate said relays, there being a greater number of said contacts than'operating circuitswhereby said switching, mechanism must be selectively operated in'predetermined sequence to select thegconta'cts connected with said operating circuits to'properly operate said relays in the necessary sequence to control the closure or: the desired circuit, a release clrcuit extending from said-switching mechanismdor restoring said relays to normal cond1t1on and electric devices controlled by said alarm circuit for givingan alarm.

I 7. 'A -control system of the type'described comprlslng in combination, an alarm 'ci'rcuit, a plurality of electromagnetic devices, operating-circuits for said devices each controlled b the operation of apreceding one 'of said evices in the sequence of, operation ofsaid. devices, contacts operated by the last one of said devices in said sequence of operation for controlling the closure of said alarm circuit, a switchingmechanism havmg aplurality of ofperatlvepositions, one ion operating each' 0 said devlces and other inoperative positions, whereby said devices are operated to control'the closure of said circuit only when said switching mechanism is moved successively tothe several positions controlling said devices in their "predetermined sequence of operation, a locking circuit for each electromagnetic device for maintaining it in operated condition when actuated and electrlc devices controlled by saidalarm circuit for giving an'alarm'.

8; A control system of the type described comprising in combination, an alarm circuit, aplurality of rela s each controlling the operating circuit 0 another in a predetermined sequence, contacts carried by the last relay in said sequence for controlling the 'closure'of said alarm circuit, switching mechanisn fgghaving contacts and operating circuits'exiiendingeach from a deslred one of said contacts to operate said relays, there being a greater number of said contacts than operating circuits whereby said switching .mechanism must be selectlvely operated in predetermined sequence toselect the contacts connected with said operating circuits to properly operate said relaysvi-n the necessary sequence to control the closure of the desired circuit, a locking circuit for each relay for maintaining it in operated condition when actuated and electric devices controlled by said alarm circuit [for giving an ,of said devices, contacts operated by the last. one of said devices in said sequence of operation. for controlling the closure of said alarm circuit, a'switchingmechanism .having a plurality of ofperative positions, one for operating each 0 said devices'and other inoperative positions, whereby said devices circuit only-when. said switching" mechanism .is moved successively to the several ,positions controlling said devicesin their predetermined sequence of operation, a locking circuit for each el'ectroma etic device for maintaining it in operate condition when actuated, contacts operated by the last electromagnetic device in said sequence when actuated for opening the locking circuits of. the ,precedin electromagnetic device in said sequence and electric devices controlled by said alarm'circuit for giving an alarm,

10. control system of the type described comprising in combination, an 'alarm'cir cuit,a plurality'pf relays each controlling the operatingcircuit of another in a' predeterminedsequence, contacts carried by the last relay in said sequence for controlling the closure ofsaid alarm eircuit, switching 0 are operatedto control the closure of said,

circuits-extending each from a desired one of said-contacts to operate said relays,- the're' being a greater number of said contacts than operating circuits wherebys'a'id switching mechanism must be selectively operated in predetermined. sequence to select the contacts connected with said operatin circuitsto properly operate said relays in t e necessary sequence to control the closure of the desired circuit, a locking circuit for each re-' lay for maintaining it in operated condition when actuated, contacts operated, by they last relay in said sequencei'when actuated for opening the locking circuits of the ,pre-

"ceding relays in said sequence and ,electric devices'controlled 'by said-alarm circuit for giving an alarm. o v i 11. A control system of the ty e described comprising in combination, an a arm circuit,

a first relay, switching mechanism having release relay to one ofthe contacts ofsaidI I a plurality of operative positions and a correspondmgnuniber of operative contacts, a first operating circuit extending from said relay to one ofsaid contacts, a second relay, 7

comprislng in combination, an alarm circuit,

a second operating circuit, extending from said second relay through contacts onsaid first relay to a second one of the operative contacts of saiol switching mechanism, 'contacts; operated by said second relay for determmlng the closure of said alarm circuit,

idle contacts on said switching mechanism. whereby the operative contacts must be selected and closed in predetermined sequence to operate said second relay, a locking circuit for said first relay extending through contacts on said second relay whereby when said second relay is operated said locking circuit is opened and electric devices controlled by said alarm circuit forgivingan valarm.

12. A control system of the type described comprising in cOmbination, analarm circuit,

a plurality of control relays'arranged for a predetermined sequence of operatlon, each of said relays after the first in said sequencehaving its operating circuit extending through contacts on the relay preceding'it in said sequence, switching mechanism having contacts one for each relay connected to the corresponding operating circuits of. said re-' lays; contacts, operated by the last control relay in said sequence for determining the closure of said alarm circuit, idle contacts on said switching mechanism whereby the .operative contacts must be selected and closed by said switching mechanism in certain order to operate said control relays in said predetermined sequence, locking circuits dt'or said relays, contacts carried by the last relay in said sequence for opening the locking circuits of the preceding relays when said last .relay is operated and electric devices controlled by said alarm circuit for giving, an alarm. 1 I i v v 13. A control syst-emmf the type described comprising in combination, an alarm circuit, a plurality of control relays arranged for a predetermined sequence of operation, each of said relays after the first in sald sequence having *its. operating circuit extending through'contacts on the relay precedmg it in said sequence, .switching mechanismhaving contacts one for each relay connected to the corresponding operating circuits of'said relays, contacts operated bytlre last control relay in said sequencefor determining the closure of said alarm circuit, idle contacts on said switching mechanls m whereby the operative contacts must 'be selected and closed by -said switching mechanism in certain order to operate said control relays-in said predetermined sequence, a release relay forrestoring by its operation said control relays, a release circuit extending from'said an alarm. r

actuated, a release erelay operated by said alarm.

switching mechanism and electric devices controlled by sald alarm circuitfor' giving 14. A control system of theftype described a plurality of electromagnetic devices,op-'

crating circuits. .forsaid devices each controlled by the operation of a precedingone of said devices in the sequence of operation of said devices, contacts operated by the last one of said devices in said sequence of operatlon for controlling the'closure of said alarm circuit, a switching'mechanism having a plurahty of operative positions, one for.

operating each of-sa'id devices and other in-- operative positions, vwhereby said devices are operated to control the closure of said circuit only when said switching mechanism is moved successively to the several positions controlling said devices in their predetermined sequence of operation, a lockingcircuit for each electromagnetic device for maintaining it in operated condition when switching mechanism foropening said lock- 'of said alarm circuit, switching mechanism having contacts and operating circuits extending each from a desired one of said contacts to operate said relays, there being. a greater number of said contacts than oper- ',ating circuits whereby said switching mechanism must be selectively operated in predetermined sequence to select the contacts .connected with said operating circuits "to properly operate said relays in the necessary sequence to control the closure of the de-' sired circuit, a locking circuit foreach relayfor'maintaining it 1n-- operated condition when actuated, a release relay operated by said switching mechanism for opening said locking circuits and electric devices controlled by said alarm circuit for giving an.

16, A control system ofthe type described comprising in combination, an alarmcircuit, a plurality of relays each controll ng the operating: circuit of another in a predetermined sequence', contactscarried by the last relay in said sequence for controlling the closure of said alarm circuit, switching mechanism having contacts and operating circuits extending veach from a desired one of said contacts to operate said relays, there beinga greater number of said-contacts than operating circuits whereby said switching mechanism must be selectively operated in pre- :determined sequence to select the contacts ,mechanism having contacts and operating circuits extending each from a desired one of said contacts tooperate said relays, there being a greater number of said contacts than operating circuits whereby said switching mechanism must be selectively operated in predetermined sequence to select the contacts connected with said operatingcircuits to properly operate said relays in the necessary 'sequence ,to control the closure of the alarm circuit, a locking circuit for each relay for maintaining it in operated condition "when actuated, door contacts in said alarm circuit, and a cut-off relay actuated by the operation. of said door contacts for controlling by its operation the closure of said alarm circuit.

18. A control system of the type described comprising in combination, an alarm circuit, a plurality of relays each controlling the operating circuit of another ,in a predetermined sequence, contacts carried by the last relay in said sequence for controlling the closure ofsaid alarm circuit. switching mechanism having contacts and operating circuits extending each from a desired one of said contacts to operate said relays, there being a greater number of said contacts than operating circuits whereby said switching mechanisinmust be selectively operated in predetermined sequence to select the contacts connected with said operating circuits to properly opcratesaid relays, in the necessary sequence to control the closure of the alarm circuit, a locking circuit for each relay for maintaining it in operated condition when actuated, door contacts in said alarm circuit,

and a cut-off relay actuated by the operation of said door contacts for controlling by its operation the closure of said alarm circuit,

said last operated relay being sluggish .in' opcration whereby the control of thealarm cirsaid cut-ofi' 'relay exercises cuit exercised by it isretained until after said alarm circuit.

19. A control system of the type described comprising in combination, an alarm circuit, a control relay, switching mechanism "for operating said relay, contacts actuated by said relay for controlling the closure of said alarm c1rcu1t,door contacts 1n said its control over 1 alarm circuit, a cut-off relay actuated by the operation of said door contacts, contacts operated by said cut-ofl' relay for controlling the closure of said alarm circuit, and a looking circuit for said control relay controlled by said cut-01f relay whereby the operation of said cut-ofi' relay opens said locking circuit, said control relay being sluggish in operation as compared with said cut-01f relay so that the control of the latter over the alarm circuit is exercised before the corresponding control of the control relay is relinquished.

20. A control system of the type described comprising in combination, an alarm circuit, a plurality. of electromagnetic devices, .operating. circuits for sai devices each controlled by the operation of a preceding one ofsaid devices in the sequencerof operation of said devices, contacts operated by the last one'of said devices in said sequence of operation for controlling the closure of an electric circuit, a switching mechanismha-ving a plurality of operative positions, one for operating each of said devices and other inoperative posit-ions, whereby said devices are operated to control the closure of said circuit. only when said switching mechanism is moved successively to the severalposr tions controlling said devices in their predetermined sequence of operation, and safety contact, springs carried by the'housing of said switching mechanism, said alarm circuit extending through said safety contact springs whereby an' attempt to dismantle said switching mechanism results in operating said alarm circuit. a

" 1. A control system of the type described tacts than operating circuits whereby said switching mechanism must be selectively operated in predetermined sequence to select the contacts connected w1th sa1d opering said safety contact springs and"actuat ating circuits to properly operate said'relays in the necessary sequence to control the closure of the 'desired circuit, and safety contact springs carried by the housing of said switching mechanism, said alarm circui'textendin springs Where y an attempt to dismantle said switching mechanism results in operating said safety contact springs and actuating said alarm circuit. l

' 22. A control system of the type described comprising in combination, an'alarm circuit,

through said safety contact a control relay, contactsactuated by said of said door, and contacts operated by said cut ofi relay for controlling the closure of said alarm circuit, said control relay controlling by its operation the operation of- 23. In combination, a casing for containing switching mechanism, said casing having a removable, front plate and an insulating plate inside of said casing carried by said front plate, spring contacts carried by said insulating plate, an alarm circuit connected with said contacts and extending toa' point remote from said casing, alarm mechanism connected with said circuit at said remote point, said contacts belng operated by the wall of said casing when saidfront plate is inplace to disable said contacts, whereby removing said 'front plate causes operation of said, contacts and of said alarm mechanism. 7

24. A control system'of the type described comprising in combination, an alarm circuit, door contacts connected withsaid circuit for! causing operation of said circuit, a control relay for disabling the control of said alarm circuit by said contacts, means for operating said control relay, and a cut-oft relay operated by said door contacts for also disabling the control of said alarm circuit by said contacts, said control relay controlling by its operation the operation of said cut-oif relay.

2-5. A control system of the type described comprising in combination, an alarm circuit, contacts connected with said circuit for causing operation of said circuit, a control relay for disabling the control of said contacts, means for operatingsaid control re lay, door contacts, a cut-0E relay operated by said door cont-acts for also disabling the control of. the first mentioned contacts, and

an operating circuit for said cut-ofl' relay extending through said dOOr contacts and also through contacts on' said control relay.

tending through 26. A control system of the type described comprising in combination, an alarm circuit,

:contacts connected with said circuit 'for causing operation of said circuit, a control relay for disabling the control of said contacts, means for operating said control relay, door contacts, a cut-ofi' relay operated by said door contacts for also disabling the control of the'first mentioned contacts, an. operating circuit for said cut-ofi' relay extending through said door contacts and also through; contacts on said control relay, and an operating circuit for said control relay extending through contacts of said cut-oft relay.

27.- A control system of the type described comprising in combination, an alarm circuit, contacts connected with said circuit for causing-operationof said circuit, a control relay for disabling the control of said contacts, means for operating said control relay, door contacts, a cut-off relay operated by said door contacts for also disabling the control of the first mentioned contacts, an

operating ClICllitfOI said cut-ofl relay extending through-said door contacts and also through contactson said control relay, and a locking circuit for'said control relay excontac'ts of said cut-ofi' relay.

28. A control system of the type described comprising in combination, an alarm circuit, contacts connected with said circuit for causing operation of said circuit, a control relay for disabling the control of said contacts, a series of relays arranged in sequence, an operating circuit foreach of said series of relays except the first in said sequence extending through contacts of the preceding relay in said sequence, an operating circuit for said control relayextending through contacts of the last of said serieso'f relays, a locking circuit for each otsaid series of relays, and a release relay haying contacts in said locking circuits for, opening the same. 1 y

In witness whereof, I hereunto subscribe my name this 21st day of J anuary .A'. D. 1916. Y 3

THEODORE H. NELSON.