US1054971A

US1054971A - Burglar-alarm.

Info

Publication number: US1054971A
Application number: US52403609A
Authority: US
Inventors: John Emil Liljeblad
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-10-22
Filing date: 1909-10-22
Publication date: 1913-03-04
Anticipated expiration: 1930-03-04

Description

J. B. LILJBBLAD.

BURGLAR ALARM.

APPLICATION FILED 00T. 22. 1909.

Patented Mar. 4, 1913.

2 SHEETS-SHEET 1.

Mme/5,5 21S' J. E. LILJEBLAD.

BURGLAR ALARM.

APPLICATION FILED 00T. 22, 1909.

Patented Mar. 4, 1913.

2 SHEETS-SHEET 2.

lil l! i JoIIN EMIL LILQIEBLAD, oF CHICAGO, ILLINOIS.

,Bouman-ALARM.

specification Letters raient.

Application ined oqtber 22', 1909. 'serial No. 524,036.

To all whom zt may concern.'-

Be it known that I, JOHN EMIL LILJE- BLAD, a citizen of the United Statesfand resident of Chicago, in the county of Cook fand State of Illinois, have invented a certain new anduseful Improvement in`Burglar-Alarms, of which the f ollowin is a. description, reference being had to t e accompanying drawings, whlch form a part of myspecliication.

My invention relates to an improvement in burglar alarms of the type wherein laline or Wire is secured across or adjacent to places of ingress -to a building or room; the free end'of said line4 or wire being. heldin place inany convenient manner, while the other end is secured to mechanism which is held preferably under tension and adapted to cause an electrical vcircuit to be formed the moment Vthe line or wire is interfered with, thereby sounding the alarm.

In the drawings Figure 1 is a perspective View of the alarm mechanism incased in a small box with the lid shown open and partly broken awayand the alarm `set'. Fi 2 is a ldetail view inelevation-'of the casing of the mechanism whereby the alarm is controlled, looking at the side of the casing where the electrodes are brought into contact. Fig. 3 is a detail view in elevation of said mechanism, lookingat the o pen side of the casing wherein the operating-mecha nism'is mounted. Fig. 4 is ajlon itudinal sectional view on the line 4- -4 o Fig. 3. Fig. 5 .illustrates my invention applied to a transom, 'with 'tripping 'mechanism secured onto a door whereby the movement of either the transomy or door will set off the alarm. Fig. 6 is a side view ofthe tripping mechanism shown in Fig. 5 with a por-.t tionv of, the doorLcasing shown in section. Fi 7 is a detail view partially in section an taken on the line 7- -7 of Fig. 6 and looking in the direction of the arrows, illustrating the means employed whereby the tripping mechanism may be placed into po sition to engage or trip the means vfor releasin the electrical contacts or electrodes where y the circuit is controlled, and vvthe alarm mechanism actuated. Fig. 8 is'fa detail view of `the combination or 'means shown in Fig. 7, illustrating that portionl whereby the position of the tripping-'mechanism is determined.

To illustrate the rinciple 'of m in v'en- 'sition. In order to tion, I have shown t e alarm set in Fig.

5, by 1eading`"tl1e line 1f-which may be either a string orl wire or other suitable device-.-

across thellower part of the transom A with its freejend secured at b. This line a leads tothe alarm-circuit controlling mechanism. the alarm may forl which, together wit conveniencebe inclosed in a box B. The alarm comprises the ordinary style of elec-A tric-bell C; the current being supplied by a suitable battery D, which -is wired to' the also ,to plug d by wire 0 ,-see Fig. .1

Patented Mar. 4, 1913;.

and the circuit is completed through switch e when the latter is moved into contact with plug j, through wire g connected with `con tact-piece or electrode h, electrode z', through the metallic casing or Wall E and wire-j to the other plug of the bell. As the bell is of a well-known typel it will not be. necessary to follow out the manner in which the current passes through the electro-magnet and vibrating member. Contact-piece or electrode h preferably has its free end bifurcated or ook-shaped to ,take about the free end of electrode or contact-pointe', as clearly shown in Figs. l and 2. The electrode k,

itvwill be understood, is secured to the box. i

B,' which is made of woodor other non! conducting material, or to a wooden block vorv other insulating material wit-hin the box,

contact-point i is pivotally secured at -cfto wall ET' and takes over the top of gear Zand throu h the curved or eccentric slotn4 in wall and between the bifurcated end of contact-piece L, as can clearl be seen in Figs. 3 and 4.` Electrode z' 1s preferably made to bear frictionally against the wall ofslot m in an suitable manner, as for example by-maklng electrode in the nature of a spring-arm with the coil or twist therein as shown in Fi 1 at c, which tends to frictionally hold t efree end of the electrode against the upper wall of the slot as Vclearly shown. A v Suitably mounted between the 1 walls E L `casing E as clearly shown inFig. 1. Y

susv

clock-spring, type, whic` ezxierts its tension on gear o so' as to return itto' its normalpoth Sprlngproperly keep in place, providedis c. "Secure to gear t, and gear Z are secured, to wind up the Z. and alsoA connected with pinion p, is the;

drum or spool t on which is wound the string or'wire a, Fig. 5, whose free endmay be provided with a loop or hook to permit of its'being readily drawn out and secured at the desired point. y p

It is apparent from the foregoing that the tension of spring -1 tends, through the medium of gear o which meshes with pinion p mounted on the spindle g on which thespool string or wire a onto spool t, so that the moment the free end of the string or wire a is released or broken away 'from its fastening,

the gear Z will be permitted to revolve in a direction that will take :up the unwound portion of the wire or string, It is also apparent that'- the drawing out of string or wire a will compel 'the spool t and with itY spindle g and gear Z to revolve in the opposite direction from that in which the tension of the spring exerts itself. 'Ihe nature of slot m is such that when electrode is moved toward the center of the slot, the electrode will be made to take between the teeth of gear?. It is apparent therefore, that when the` electrode z' is thus set, a movement of gear Z in either direction will also compel electrode z' to move in the same direction until the electrodereaches the ends of the slot fm, when it will be out of contact with gear Z and as the distance between the bifurcated end of electrode h is less than the length of slot m, the electrodes z' and l1, will be brought into contact with each other andthecircuit closed.

The alarm is set by drawing out the string or wire a and fastening it across the path' that will necessarily be'taken orto the window or door, thereby also unwinding spring r and increasing its tension; when the string has been fastened in place, the electrode i, is moved into the center of slot m, bringing it into contact with the teeth of gear Z. evident, that if. the string or wire a is drawn out farther, gear Z will turn and `.move electrode z' toward one end of slot m, and int-0 contact with one branch of stationary elec` trode h; while the release of string vor wire a will permit the tension of spring r to exert itself and turn gear Z in the op osite direction and force electrode from t e center of slot m; toward the otherside of slot m and into contact with the other branch or bifurcation of electrode h, thus, in either event, closing the circuit.

' In `order that the4 alarm may be set during absence, and at the same time permit of lone string or wire answering for both door and transom, I provide aV tripping mechanism as villustrated in Fig. 5, which consists of rod F, the lower end of which is formed or provided with a rack as shown at u; vwhile the upper end of the rod may be bent to take over the casing intermediate of It isv the door-top, and the transom, if the casing prQirudes to any extent beyond the perpendicujlar planeofdoor and transom. The upper: end of rod'F is preferably provided with the hook-portion u-see Fig. G-which is so formed as to present its points toward each other,.leaving only a small distance'between the tips as' 'clearly shown in Fig. 6. When the alarm is set for the transom and door, the string or wire a is passed through the hook or encircling portion u as shown in Figs. 5 and 6. Secured onto .the outside of the door is knob G, whose shank takes through the door and has its inner end provided with a pinion o which meshes with the rack u on rod F. The inner end of the 4shank of knob G may also be provided with a similar knob so that rod F can be operated and put into the desired position from the inside.

In order that the posit-ion of the hookportion of the rod with reference to the string or wire a may be determined, dials H,-see Fig. S-may be employed, provided with designations or degrees as indicated. The relation between the dial and knob is such that when a redetermined point-or pointson the knob reaches a selected designation or degree on the dial, the hook-portion of the rod F will be in such position as to permit of the opening ofthe door, allowing the string or wire to pass between the points of the hook, thereby leaving the strin undisturbed.

It 1s apparent from the foregoing description, that when a party'abouttopass out of the door wishes to leave thev alarm set, the knob on the inside is turned until the selected points on knob and dial` register,.

bringing the hook-portion into position to permit it t0 pass the string a without interfering therewith and then after passing out and closing the door, the knob G on the outside is turned to throw the designated points out of register, thereby again bringing one ofA the points into the horizontal plane of the' string or wire a, as shown in Fig. 6.

It is apparent, that if the transom A is opened it'will bend rod F,-which may be light or fieXible-and pull on string or wire a thereby operating the alarm on the other hand, should the door J be opened, the string or wire a willv be pulled by hook u as previously described. y.

The lower portion of rod F, together with pinion u may be covered by a plate as shown at K, Figs. 5 and 6. When the mechanism is to be inclosed in a box B as shown in Fig. 1, it is advisable to provide the box with an opening as shown at L, so that the alarm can be distinctly heard; and this opening may be covered with a screen er wire gauze so as to l however of placing all the mechanism in a box as shown, the electric door bell may be electrically. connected with the setting mechanism which can be located at any convenient place. l l

It is clear the mechanism shown and described may be altered in certain details without departing from the spirit of my in vention, and I do not wish to be understood as limiting myself to 'the exact construction 'set forth.

v .It is also apparent that the device may `be used as a -re-alarm-by arranging the hnes, formed of any inflammable or fusible material, about a building, so that the moment' the spring-controlled mechanism is released,

-the alarm will be sounded. u

`side of the slot so as ,toA maintain an ad-v justed position, said electrode bein pressed into engagementy with the fsprin con trolled gearing when moved into 1ts.adjusted position, astationary electrode whose free end extends about the pivoted electrode' and' out of contact 'therewith when the piv oted electrode is in its adjusted position, means secured to the extended hub or spool and to be wound thereon, the other end of- `said means being adapted to be secured at some distan-,ce from the hub or spool, so that when said means is moved the spring controlled'gearing will rotate and move thefpivoted electrode 'out of its adjusted. position and into contact with the stationary electrode. v

2. A burglar alarm, comprising a casing provided with a transversely extending slot in one of its sides, the portion of the slot intermediate of its ends extending into a lower horizontal plane than theends, a spring controlled spool or .drum mounted in said casing and having a serrated or toothed rim, anannunciator arranged in a normally open electric circuit, a .pivotally mounted resilient electrode the end whereof extends through said slot and has frictional engagement with the upper side thereof, the 1votally 'mounted electrode being adapt to 'be brought into engagementwith` the serratedor toothed rim when the outer end of the:` electrode is moved to a point intermediate of the ends of said slot, a stationary electrode havin a bifurcated end extending to opposite sides of the pivoted electrode, and a cord or wire winding on said -spool or drum, the one end of said cord or wire being adapted to be secured4 at a point removed from the alarm and revolvin the spring, so that whenv the cordv o r wire is in- 'fterfeed with the spool will' revolve and movevthe pivotally mounted electrode-into contact with the stationary electrode.

JOI-IN` EMIL LILJEBLAD.

Witnesses: y

GUs'rAr A. AKERLIND, NORMAN A. STREET.

spool or drum against the action o .the