US2407122A - Portable burglar alarm - Google Patents

Description

f the conductors and to the contacts vulfaricl 55 byset, screws B0 kand adjusted l tool-artis or awayffromthe'respective j fstanceitconsistsoi a standard 64a vertical arm` "12; `other."insulation is remployed where needed;

" .iusted to a level-position determined by a suitable v fixed uponithe base -memb`er I6 to protect the pendulum'li, theassociated contactsAS, 52, the resistance Vl2 and the shunt circuit .wires `against tampering by unauthorized persons.

The main `circuit wires 2 and 4 may "oe of the` horneto notify .the owner: i an attempt is f made to steal the automobile, or ifa wheel is springt! topull the armature I5 .against contact 1 Bland thus closethe burglar alarm circuit.

"fcauses said basemernberw inc-line towards its leit'end, the-pendulum 46 will Ygravitate intov shuntcirciiitlthrough wire 43, conductor 4l, conf" o l short circuit the resistance i2. Thus the strength'- o the current, flovvingth'rough the electromagnet and attractthearmature `I5 against contact v3|-,V

.5| of resilient material theymay yield and `avoid damage to thecontacts f8, 52, 54 and 55 the eventthat the penduluml .shouldbe swung vioientlyrio eitherlside. The contacts i8; and 52` are held in "spaced ,-relation* indicator consisting` inthe present instance of a -i freelyl mounted pointer 82 and vanindex mark 84.@ l

`'The Ievelgindicatorlmay be `observed through a small windowfli inv-a burgler-proof casing 86 `being `jacloed up forthe purpose of removing a tire l therefrom. Preferably `the main circuit wires :2 and 4 are either armored or concealed. However,` if eitnero'neop both arecut theelectromagnet tions'oi tlieoregoing elements together, means `carried by the Astandardandthe-arm andihaving T a Vswivel connection with each `conductor for ad- `justine they lower portions of the latter toward or away from the pendulum, andl means `for norv mally vretaining the standard andthe arm in .,-Bwill `become completely deenerglzed und vpermit n Assuming tliatgthe switches` I4 and 20 arev closed and switch 24'issin engagement with cony tact' 25, andthatthebase meinber, with assoelated parts; is placed on a mobileob'je'cait is evident that'in theI event the latter is moved and,

engagementfwith the contactli ancij'close` the` tact 6B, pendulum `4'6 and wire 44 and lthereby y anos/,122 i Etlireaded in afsllpliortandhaving suri'velicom- Y nections with'ihe Icon'doctors'Jil-ganci 5l, respec#V i ativelyso. that the contacts lyand V52 matitev intervening contacts tivandd;v Any suitable 2 support may .be employed. In the present in: o

i v thereby closing the burglar alarm circuit through armatu're i5,` wire l,` sxvitch-2, vali-cl2. switch '24, Contact, 25, bell 27'. Wire 29, conductor@ and Qcontact 3|. In the event'that the base member I5 should be' restored Atoalevel position and allow I tlie pendulum 4'6 `to move out of engagement with "the clJnt-ac;v `lili, Ythe weakened current` flowig; l through the electr omagnet 8 will stillsuillceto :maintain .the alarm circuit injclosed condition owing to vthe close `prcoumity of rthe armature l5 to the core of the eletcromagnet 8. The alarm circuit remains `closed untilthe switch f4, or 20 ,ig opened. Should tllebase member T6 become tilted to fthe right. theY pendulum-will gravitate-v into .engagement Withcontact 52 and close the * shuntcircuitthrough wires 43 and 5 0, conductor4 Y 5f, Contact' 52, pendulum 45 and `Wire M; thus i l l resulting in the short circuiting of thejresistance Thestandard-Biissecuredat its lower end l.` ."uponla base memberl mounted at one end una l-Hroclzalile element 7 3 and proridcdat'itsother end with aser, 'screw Blwhereby it may be ad,-

l2 and closing ofthe alarm circuit, l

f It has al1-early been'statedihptv the 4i sill effectgclosing o f the alarm circuit,f and how the light circuit (ill` may be closed when de s ired.l`

From the foregoing it is apparent thatI. havev Y provided a burglar alarm ,Whichiswell adapted for the purpose intended; and while I have shown -t-h'e invention as claimed. f

l f claim and 'desire to secure by LettersPatent, is: 1 i an,11. f length, so that the casing 86 and partsassociated therewith canjbe placed a considerable distance `from tliealarmcircuit..k For instance, the casing f 8 6 can loelplaced'inv an automobilestored in a garage while; the alarm circuit can be located inv 'In a portable burglar alarm, a pair of resilient doctors and a vertical arm disposedadjacent to `ll. is vincreased surticientlyto overcome .spring 40 the other conductor, insulated means .interposed l 1 between the upper portions of the `conductors and the pendulum and betwecntlle standard and the armynieans for rigidly clamping the upper porvertical .position to normally maintain the pendus.

.lum Vin neutral position., said pendulum being r adapted to gravita'te` and earn/one` of its conf vtacts into Vengagement with one oi the other conz` tacts and close an alarm circuit ithe" standard is tilted in one direction or, gravitate in anop- Y.

l posite direction and carryits other* contact into f f engagement with the'companion contact and close jV the alarm circuit if tliestandard is tilted in a reverse direction. f f s i f l z CHARLESE.YOUNG.

a.r preferred ari'angemento'f my alarm system, 1 reserve all rights to suclichanges and modiiica- 1 tions thereof as properly fallwithin the` scope ci

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