US886355A - Invisible electric burglar and fire alarm. - Google Patents

Description

PATENTED MAY 5, 1908.

J. W. DAWSON. INVISIBLE ELECTRIC BURGLAR AND FIRE ALARM.

APPLIGATIGN FILED SEPT. 12, 1907.

Z ZZW gagemcnt with contact 4; from battery l. through conductor 2, switch 3, ontact 4, conductor 14, conductor 18, contact 19, c1!" cuit maker 2! conductor 1!), conductor 20, conductor 16, binding post .7, through conductor f5, eleetro-magnet J, conductor 10, the alarm mechanism 11 and conductor 12 back to the battery. The establishment of this circuit starts the operation of the alarm mechanism and the energization of the magnet attracts the armature or drop 11- until the same engages contact 7, the result being the conductors H, 15, 1t), 20, 2t), and It), a e cut out of the circuit and the current follows the shorter or local circuit from the hattery through conductor 2, switch 3, contact 4, conductor 5, armature or stop 6 contact 7, conduct-or h, elcctro-magnet J. conductor 10, alarm mechanism 1 conductor t2 back to the battery. it will thus he seen that. this local circuit causes the ringing of the boil after being once established irrespective of the existence of conductors l4 and l6 and those connected with them. if the thread instead of hrcaking should ell'cct the withdrawal of the circuit breaker 24 from between the members of contact 15, said arms will spring together and thc circuit will be from contact 4, through conductor 14. contact-15 and conductor ltior if anything should. prevent the niembcrsoi contact 15 from completing the circuit the circuit maker 2! will drop as hcreinbcl'orc cxplained and establish a connection between contact members 19. It will thus be seen that there is practically no danger of failure to complete a circuit from the battery in the event of the 5 breaking of the. thread or the pulling thereby of the circuit breaker from between the memhers of Spring contact 15.

It will be understood of course that thc breaking of the thread from any cause, such for instance as lire, will set the alarm in operation and in this case notice will be given to the person in charge before irreparable damage is done.

From the. above description it will be apparent that l have produced a hur lar and lire alarm mechanism possessing the eatures of advantage enumerated as desirable and I wish it to be understood that I do not desire to be restricted to the exact details of construction shown and described as obvious modifications will suggest themselves to one skilled in the art.

Having thus described the invention what I claim as new and desireto secure by Letters Patent, is

1. A signal system, comprising a battery, an alarm mechanism, a pair of spring contac s, a second pair of spring contacts one of each being electrically connected together and to the. positive pole of the battery, conductors connecting the other pair of contacts with the alarm mechanism and the negative pole of the battery, :1 thread suitably guided and having an insulating plate between a pair of said spring contacts to hold them apart and pent mg circuit-maker ield above and out of contact with the other pair of spring contacts and adapted in thc event of the breaking of the threadm of the witlnlrawal of the insulating platel'rom the path of the first-named contacts to drop between and electrically connect said separated spring contacts.

2. In an alarm mechanism. a battery, an cli-ctro magnet, an alarm mechanism, a contact connected to the magnet and in uninterrupted circuit with the signal mechanism and one pole of th batter an armature or drop connected to the opposite side of the battery and adapted when the magnet i energized to engage said contact and establish contacts electrically connect d respectirely to the first-named contact and the pole of the battery to which the armature is connected, and a thread-sup )ortcd means for ctl'ecti v the completion oi the circuit between sai spring contacts.

in testimom whereof I aiiix my signature;

in the presence of two witnesses.

JAMES W. DAWSON.

'Wi messes H. C. RODGERS,

. Y. THORPE.

rovided atits op osit end with a (lo-- I a l cal circuit through the alarm mechanism, '85

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