US1240049A - Fire-alarm. - Google Patents

Description

0.1. JENNE.

FIRE ALARM.

APPLICATION FILED FEB. 9. 1917.

1,240,049 Patented Sept. 11,1917.

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the lterznechate 1 nected with the other arm.

A pawl 9 is plmted. near H d SH of the tube 4. and i1 1 is connected. to

the

20 until the lever will eventually engage the circuit. The lever, Bourdon tube and cor tact mechanism are arranged within a case, which is'indicated in dotted lines, a'ndan electrical cnt-out'ifidicated at. 35 is provided igconiiection with the casing cover, so arflanged that the cut-out will shunt across or reservoir to the enlargement or reservoir 21, and will overbalan'ce that end of the lever which is adjacent to the Bourdon tube contacts 22, completing the circuit through the local alarm. The lever 16 is normally balanced to swing downward at the end remote from the Bourdon tube, and the pawl 9 holds the lever against this tendency to swing. As soon as the local circuit is closed, the alarm 28, a bell in the present instance, will be actuated, informing the subscriber that there is a leak, the alarm, however, will be local and for the subscriber only;

Should one of the sprinkler heads open in case of fire, in the same manner as the,

ordinary sprinkler head, the pressure in the tubing will be quickly released, and the quick contraction of the Bourdon tube will swin the adjacent end of the lever downw'ar quickly and the pawl will pass the end of the lever, thus releasing the lever, and the heavy end of the lever will reverse this swinging movement of the lever and will causethe end adj acent; to the enlargement 20 to swing downward, and the contacts 23 and 23 will close the circuits 27 and 30 thus turning in the alarm, and in addition turn ing in a local alarm. The action of the Bourdon tube when there is a sudden decrease in the pressure, will be so quick and the lever will be released so quickly, that therewill not be time for the mercury to run into the enlargement 21 to overbalance the normally heavy end of the tube.

The rule joint connection between the awl and the movable section permits the ever;

to pass downward past the pawl, and it will be noticed that the adjacent end of the. lever and the movable section of the pawl are bev eled to facilitate its movement.

I claim:

1. A fire alarm system comprising a tube extending throughout the structure to be protected and having fusible plugs carried thereby, and adapted to be supplied with air I above atmospheric pressure, a Bourdon tube having at the same end a pair of contact lugs and at the other a single contact lug, each of the c1rcu1ts'hav1ngterminals for engagement by the pair of lugs when they swing downward to simultaneously close the said circuits, and the local circuit having terminals for engagement by the single lug when the said lever swings downward to close the local circuit, a pawl engaging above the last named end of the lever and normally holding the lever balanced, a connection between the pawl and the blind end of the Bourdon tube for moving said pawl downward to tip the lever when the pressure in the Bourdon tube is slowly lessened, and to tip and release the lever when the pressure in the tube is suddenly lessened, said lever containing a heavy fluent material adapted to run into the light end when the lever is slowly tipped to overbalance the heavy end, and means for varying the flow of the said material.

2. A fire alarm system comprising a tube extending throughout the structure to be protected and having fusible plugs carried thereby, and adapted to be sup lied with air above atmospheric pressure, a ourdon tube connecting with the system, a local alarm and a central station, an electric circuit for the local alarm and an electric circuit for the central station, a switch lever pivoted intermediate its ends adjacent to the blind end of the Bourdon tube, said lever having at each end a contact lug, said lever being balanced to swing downward at the end remote from the Bourdon tube, means controlled by the Bourdon tube for holding the lever balanced when the Bourdon tube is expanded under pressure, and for tipping the adjacent end of the lever downward when the pressure isgradually released, and for tiphavingterminals for engagement by the said adjacent end of the lever for closing the same, and the central station circuit having terminals for engagement by the other lug.

C RISTIAN JENNE.

lVitnesses C. A. Bow: Ar 0, C. R. Ynmsnnr.

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