US500329A

US500329A - Fire-alarm

Info

Publication number: US500329A
Authority: US
Publication date: 1893-06-27
Anticipated expiration: 1910-06-27

Description

(Nuo Model.)

D.- HBWITT.- PIRE ALARM.

No, 500,329'. Patented June 2'7, 1893. y fagl.-

l|||||||l|||| l vf' "M 'V'a t ,f l jz'vevzo/r @mito/P71656 UNITED STATES PATENT OFFICE.

DAVID HEVVITT, OF MUISKIEGON, MICHIGAN.

FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 500,329, dated June 27, 1893.

Application tied March s, 1893.

To aZZ whom it may concern,.-

.Be it known that I, DAVID HEWITT, a citizenl of the United States, residing at Muskegon, in the county of Muskegon and State of Michi-l gan, have invented certain new and useful Improvements-in Fire-Alarms; and I do declare the following toy be a full, clear, and exact description of the invention,such as will enable others skilled inthe art ,to which it appertains tol make and use the same',

My invention relates to improvements in that class of'automatic fire alarms whichareV operated by the severance of a cordor wireorany fusible substance; and it has for its general object toprovide such an alarm of a cheap, simple, and-durable construction and .one which lwill act positively tofsound a protracted alarm when the cord is severed.

Other objects and advantages of the inven tion will be fully understood from the follow-A ing description and claims when taken in con# nection with the accompanying drawings in. which- Figure 1, is a side elevation of my improved alarm; and Fig. 2, is a plan view of the same with the cord or wire removed.

Referringby letter to the said drawings:- A, indicates the mainframe of my improved alarm, which preferably comprises side plates -ratchet wheel E, and a loos gear Wheel F; the

latter of which carries a pawl d, in engage' :ment with-the wheel E, whereby it will be seen' that when it is locked, as will be presently described, it will hold -the spring contracted and will"'prevent the shaft from rotating.

.Fixedly mounted upon a transverse shaft G, journaled'in the plates a, is a pinion H, lwhicn meshesy with the gear wheel F, as shown; land also mounted on the shaft G, is a trip serai 110.464.725. (No man.)

piece I, which is designed and adapted to eu- .gage and rock the clapper lever J. This lever is fulc-rumed at an intermediate point in its length, as shown, and itsupper portion 1s connected with the frame A, by a coiled spring K, whereby it will be seen that when the said lever is released by-the trip piece its head will be carried violently against the bell and a loud sound will be made. The shafts C, and G, are normally held against rotation engages the trip piece I, as shown. This weighted lever is normally held in the posi.-

have one of its ends secured or provided with a suitable counterbalance weight, spring or tension, as shown.

.Inthe practice of my invention the alarm mechanism is placed at any suitable point in stretched over sheaves or the like through the several rooms; the said cord being preferably arranged near chimneys .and other points where a fire is .likely to occur. .Thus itv will be seen that when a tire breaks out, the cord will be severed, the lever L, will be allowed to fall and the alarm mechanism will be set in motion.

scribed for actuating the clapper level-,it will be seen that the head of said lever will be repeatedly carried against. the bell with great force, for a protracted length of. time which is an important desideratum.

It will be noted from the foregoing `description taken in connection with the aecompanyiug drawings that my improved alarm is exceedingly simple, that it is positive in its liable to get out of, order during the generally long period of its disse.

In the foregoing description I have specifically described the construction of my ini-- proved alarm, in order to impart a full understanding of the same, but I do not desire to 'be understood as confining myselfto such specific construction, as such changes or modifications may be made in practice as fairly fall within the scope of my invention.

Having described my invention, what I claim is 1. In an automatic fire alarm., thecombinaby the doge, on the weighted lever L, whichtion shown by thecord or `wire M, which may By -the provision ofthe mechanism de-v action and that it Iembodies no parts that are or on a building, and the cord or rope M, is

tien of a bell or gong, the clpper lever, a tor spring or weighted rope for .rotating the spring tending to carry the lever against the same, a ratchet wheelfixed on Said shaft, and go bell, a rotary shaft G,a trip piece mounted on a gear wheel loosely mounted on thc shaft said shaft G, andfengaging the clapper lever, and meshing with the pinion of the shaft C,

5 a suitable means for rotating the sl1aft,tl1e and cari-vintr n pnwl in engagement with the lever arranged belo` the shaft G, and having ratchet wheel; of a Weighted lever hnviiig n. a dog to engage and hold the trip piece and dog adapted to engage and hold the tri p piece 2 5 also having its free end weghted,and a cord of the shaft G, and a corddmving one of its l having one of its ends connected to the free endsconnected toI the Weight-ed lever :u ul its lo end ot` the weighted lever and its opposite opposite end secured or 'provided with n end secured or provided with a weight, snbweight, substantially as'speciied.

stantially as specified. In testimony wlicreoflnliix my signature in zo 2. In an automatic fire alarm, the combinapresence of. two witnesses. tion with a bell or gong, a clapper lever, a t l DAVID HEWIT'X l5 spring tending to carry the lever ngainstthe bell, a rotar shaft G, carrying :t pinion, a p Witnesses: V trip piece mounted on said shaft and engag- S. A; ALDRIOH, ing the clapperlever, the drive shaft C, a mo- ADAM PYLE.