US1425287A - Fire alarm - Google Patents

Description

FIRE ALARM.

APPLICATION FILED DEC.8, 1919.

1,425,287., t nt d Aug- 8, 1922.

I ums/who's 77(2) @dcda, I i 4). Quiz/Lew df tomwq I MICHAEL D. S. BIGCIO, 0 JAMESTOWN, NEW YORK.

man ALARM.

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$pecification of Letters Patent.

Patented Aug. 5%, 1922.

Application filed December 8, 1919. Serial No. 343,281.

To all 71 cm may concern:

Be it .lcnown that I, lV.lICHAEL D. Bionic, a citizen of the United States, resident oi Jamestown, in the county of Chautauqua and Fitate of New York, have made a certain and useful Invention in Fire Alarms, and declare the following to be a full, clear. and exact description of the same, such as will enable others skilled in the art to which it appertains to malro and use the invention, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 is a side view of the invention.

Figure 2 is a detail end view of the gear train showing the hammer lever.

The invention has relation to fire alarms which operate automatically upon fusing or parting of a tusible device to set 0.. the alarm, and it consists in the novel construction and combinations of parts, as hereinafter set forth.

In the accompanying drawings illustrating the invention, the numeral 2 designates casing. wherein is mounted a gear train or clock train suitably driven. as by a spring 4. and the escapement 5 of which is pro vided with a vibratory hammer 6. thehead 7 of said hammer being located close to the side wall or a side wall of said casing. The train is attached to one side wall only of the casing preferably, and the cas-= ing is deep enough or wide enough to admit of key 8 for the helical spring being engaged with the stem of the spring and remaining permanently in the casing. The hammer head. vibrates against another side wall of the casing or an end wall thereof right angles to the casing wall to which the gear train mounting or fixture is connected, and the casing being of tin or other resounding metal the vibration of the hammer on aside wall thereof causes a sufficient noise or alarm to be heard at a considerable distance.

is necessary to hold the hammer lever 6 so that its head 7 shall be normally held away from contact with the wall 9 of the casing. with the escapcment 5 in engagement with the escapement wheel 10, thereby holding the gear train from being driven by the helical spring. To this end, the hammer lever is provided with an extension or tail arm 1.1 on the other side of its pivot 12, said arm being engaged by a spring lever 13, oivoted to the casing at 14 and hav ing an arm 15 extending through a slot 16 of a wall of the casing, the terminal portion of said. arm having connection at .17 with a cord or wire 18, the latter passing to any desired location in the building over suitable guides, as pulleys or the like, and being fixed or secured at its far end at 18 to a stationary part of the building or to a stationary fixture thereof.

The cord or wire 18 is fusible and when parted by fire at any part of its length, it is necessary that the hammer shall be released without fail. This cord or wire will usually pass through all the rooms of a building over suitable guides, and when parted any distance away from the alarm device, it is necessary owing to drag of the cord or wire over said guides that the cord shall be under tension. Therefore the spring lever 13 is provided with a coil 19 in its arm 15, said coil being intermediate of the lever pivot and the outer end of said arm, and the cord or wire having connection with said lever passing first at about right angles to the outer end portion of said arm 15 to bend said arm and put the coil under tension before the far end of the cord or wire is made fast to the building or fixture. To enable the said coil to be put under sufficient tension, the inner arm of the lever 13 is angularly bent at 21 and engages at its outer or free end. with a wall of the casing, taking a bearing against said wall when tension is exerted upon the cord or wire. The fusible cord being tensioned, the arm 30 of the spring lever will take a bearing against the wall of the casing and become tensioned, and thereafter the outer arm of the spring lever will become tensioned to a varying extent as may be desired.

In this way, as soon as the cord or wire 18 parts at any point in its length the spring lever 13 will snap or fly to released posi tion, thereby releasing the hammer lever and the escapement, whereupon the helical spring will cause rapid vibration of the hammer to sound the alarm. The longer and weightier arm 15 of the spring lever falling through force of gravity assists in the release of the hammer lever.

I claim In a fire alarm, a casing, a main spring, a gear train driven from said main spring and including an escapement wheel, an es p e t pa l co-acting with sa he l,

a hammer lever integral with said pawl and having a tail arm, a spring lever having an outer arm provided With a Coil therein and an inner angnlarly bent arm engaging said tail arm to hold said hammer lever set against vibration, and a fusible cord connected to said outer arm, the free end of i said inner arm having a bearing against the casing to thereby tension said arm and

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