US347797A - Mechanism for extinguishing fires in malt and grain mills - Google Patents

Description

(No Model.) 2 sheets sheet 1.,

C. J. HEXAMER.

MEUHANISM FOR EXTINGUISHING FIRES IN MALT AND GRAIN MILLS.

No. 347,797. Pate'ntedAug. 24, 188

WITNESSES: INVENTOR I cifimqv,

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(No Model.) 2 Sheets-Sheet 2.

7 O. J. HEXAMER. MECHANISM FOR EXTINGUISHINGPIRES IN MALT AND GRAIN MILLS.

0. 347,797. Patent-ed Aug. 24, 188

' N. versus. Fhom-Ulhognpher, Washington. no. I

UNTTED STATES PATENT @rrrca.

CHARLES JOHN HEXAMER, OF PHILADELPHIA, PENNSYLVANIA.

MECHANISM FOR EXTINGUISHING FIRES IN MALT AND GRAIN MILLS.

SPECIFICATION forming part of Letters Patent No. 347,797, dated August 24, 1886.

Application filed August 24, 1883. Serial No. 104%22.

To all whom it may concern.-

Be it known that I, CHARLES JonN HEXA- MER, a citizen of the United States, residing at the city and county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Mechanisms for Extinguishing Fires in Malt and Grain Mills, of which the following is a full, clear,

and exact description, reference being had to the accompanying drawings.

Figure 1- is a transverse vertical section of a malt or grain crushing or grinding mill provided with my improvements. Fig. 2 is a similarsectional view thereofishowing l he positions of the several par s upon the occurrence of a dust-explosion within the mill-box. Fig. 3 is a detail, enlarged, ofparts of the vent-pipe and drop-lever and devices forsupporting the latter.

These improvements are designed to extinguish at their incipience fires resulting from explosions ofthe impalpable malt or grain dust occasioned by the ignition of such dust from sparks thrown off by the mill-rolls striking some hard substance-sueh as a piece of iron-- in the process of grinding or crushing the malt or grain. It is well known that such explosive fires have frequently been of a very serious character, because, more especially,oftheir extending from the mill-box to the elevatorboots, by which they ascend to the upper stories, and thus spread throughout the entire building.

The object of my present invent-ion is to prevent such catastrophes, which I do by the following means:

Referring to the accompanying drawings, A is the mil1-rooin; M, the mill-box situated therein; R R, the grain-crushing rolls; I, the influx-pipe by which the grain or malt m is conducted to fall between rolls RR, and Ethe eftlux-pipe inclined and leading to the elevator boot. (Not shown.)

The dimensions ofthe stream of malt allowed to flow onto the crushing-rolls is regulated by means of a vertically-adjustable gate, g,in the inlet-pipe. The malt which has escaped beneath this gate descends between a feed-roller, c, and a correspondingly curved-face block, I), whereby it is spread out, and thence falls between rolls R R, as seen in Fig. 1.

The foregoing, together with some other de- (Nu mOilt-l.)

tails relating to the construction of the millbox that l have not deemed it necessary to de scribe, are well known and not my invention.

The 'crushed malt or grain passes onto the elevator-boot by way of the pipe E freely that is, in mills of the usual construction. I, however, interpose and maintain a barrier in this pipe, composed of a body of the crushed malt cm, by means of a device which I term a discharger, and which is located at a suitthe dischargcr and in the hopper-shaped bottom of the millbox, as seen in the drawings, Figs. 1 and 2, so that the results of an explosion and fire within the inillbox are prevented from extending by way of pipe lfi to the elevator-boot.

The construction and operation of the foregoing-described devices are fullyexplai ncdaud shown in an application for Letters Patent en titled Improvements in the Construction of Malt and Grain Mills, filed by me February 27, 1883, (Serial No. 86,498,) for which Letters Patent No. 292,488 were granted me January 29, 188i. As also described in said patent, an additional barrier is caused to be interposed between the n1ill-box and the elevator-boot in case of explosion or fire by means of agate, J, across the 'efliuX-pipe E, which gateis connected with a drop-lever, L, by a rod, 1' as hereinafter referred to.

V is an ample vent-pipe, forming a communication between the interior of the mill'box and the open airontside the wall \V of the building.

In order to smother the tire confined within the mill-box immediately upon the occurrence of an explosion therein, I provide. steam-jet pipes 0, opening into box M, and connecting with a steam-supply pipe, Q, from the boiler. To a conveniently-placed stopcock, f, in the latter pipe I connect a rod, 1', which is also connected with a long lever, L, pivoted at w,

ICO

as above mentioned, and is sustained in or near a horizontal position at or near its free end,

as hereinafter to be described, so that while the latter is supported, as in Fig. 1, the cock 5 fis turned so as to shut off the steam; but when the said support is taken away the lever L, falling, forces the rod 1- down with it, opens the cock, and the steam thereupon rushes through the ports 0, fills the millbox, and extinguishes the fire.

The free end of lever L is held up in the following manner: A rod or rope, X, which is fastened to the lever,has a slotted block, Y, at the other extremity, which block extends up through a slot in the under side of the ventpipe V, which it will be remembered extends from within the mill-box. This block and, by sequence, the lever L are up held by means of a wedge or key, K, passed through aslot in the former, and bearing upon the bottom of the vent-pipe on either side of the slot therein, as clearly shown in Figs. 1 and 3. I prefer to make this key of oiled wood or other material that will not be apt to rust or stick, but which can always be relied upon for the purpose in view. It is connected by means of a rod or cord. 2, with a cap, Z, which covers the outer extremity ofthevent-pipe. Now, should an explosion occur within the mill-box, this withdrawal of the keyK from the block Y, the

'lever L drops by its own gravity, (or it may be suitably weighted,) and the immediate result is, that the rod 1-, which, as stated, connects the steam-cock with thelever, opens the former, and the steam rushes into and fills up the mill box, as seen in Fig. 2. In lieu of steam, some other fluid extinguisher might be applied in the same mannercarbonic acid,

for example.

In case the fire should extend outside the 1nill-box, I cause the flooding of the miltrooln with water, in order to extinguish the fire, by providing a suitable arrangement of pipes or conduits, T, with orifices t therein, also, if desired, a hose, H, and connect the cock f of a water-supply pipe, T, by means of a rod, 1, with the actuating-lever L, so that when the latter is caused to drop the cock will be opened, and the water thereby be allowed to escape through the orifices t, and alsothrough the nozzle of the hose, whereby a stream of water may be directed to any particular point or points. Instead of connecting rods r and 'r rigidly to the actuating-lever, I prefer to add to said rods, respectively, a link, Z, through which lever L passes, thus insuring the turning of the cocks by the force acquired by the momentum of the lever. A catch or loop, 3, through which the lever also passes, serves to check its fall when its work is accomplished,

- and prevents it from breaking or unduly straining the cocks and connections.

In order to make sure the drop of the actuating-lever in case the cap Z should chance not to be blown off, or the supporting-key not be drawn out, and the flames should extend ontcap will be blown off, and thereby causing the side the mill-box, I make the connection X, which holds up the lever, of cotton, hemp, or other readilyinflammable material, which, taking fire, soon severs, and thereby allows the lever to fall; and, further, in order to render assurance doubly sure, in case the flames shall not reach or quickly operate as expected, I make the rope(or rod) X, instead of integral, in sections, and connect these, as seen in Fig. 3, with a coupling, U, composed of some fusible alloy which melts at a comparativel y low degree of heat-say about 150and which, becoming melted from the heat from the fire, breaks the connection between the ropesections and permits the lever within the mill-box or ext-ending to the mill room will be efi'ectually prevented from ex tending to and up the elevatonboot.

The results following an explosion of. the dust within the mill-box are shown by Fig. 2 of the drawings. The cap Z has been blown ofl by the force of the explosion, the steam is rushing into the millbox, the water through the orifices t and out of the hose-nozzle, and the gate J has fallen across and stopped up the efilux-pipe.

Having thus described my invention, I claim as new and useful and desire to secure by Letters Patent 1. Afire-extinguisher consisting of the combination of a mill-box having steam-pipes leading therein, a steam-supply pipe connecting with said steam-pipes and provided with a stopcock, a gravity-lever provided with a rod attached to the said stop-cock, a vent-pipe communicating with the mill-box, and the means herein shown for retainingthe lever in a normal position until released by the force of a dnst-explosion,substantially as described, and for the purposes set forth.

2. A fire-extinguisher consisting ofthe combination of a mill-box having steam-pipes leading therein, a steam-supply pipe connecting with said steam-pipes and provided with a stop-cock, a gravity-lever provided with a rod attached to the said stopcock, a ventpipe communicating with the mill-box, the outer end of said vent-pipe being provided with a. removable cap, and the separable means herein shown for connecting and retaining said cap and the loose end of the lever in their normal position until thc vent-cap is blown out, substantially as described, and for the purposes set forth.

3. A fire-extinguisher consisting of the combination of a hoppershaped mill-box having steam-pipes entering therein, a steam'supply pipe connecting with said steanrpipes and IIO provided with a stop-cock, a gravity-lever provided with a rod attached to the said stopcock, a vent-pipe communicating with the mill-box and the means herein shown for retaining the lever in anormal position until released by the force of a dust-explosion, sub stantially as described, and for the purposes set forth.

4. A fire-extinguisher consisting of the combination of a mill-box having steam-pipes leading therein, a steam-supply pipe connecting with said steam-pipes and provided with a stop-cock, a gravity-leverprovided with a rod attached to the said stop cock, a ventpipe communicating with the mill-box, and the means herein shown for retaining the lever in a normal position until released by the force of a dust-explosion, said rod being provided with a link to retain the lever when dropped, substantially as described, and for the purposes set forth.

5. The combination of a millboX, the eftluX-pipe E, gate J, gravity-lever L, rod 1- the vent-pipe V, provided with a removable cap, and the separable means, as shown, for connecting said cap and lever and retaining the lever in a normal position, whereby the lever is dropped by removing the cap and the ciiluX-pipe closed by the gate, substantially as described, and for the purposes set forth.

6. The means for extinguishing fires in malt or grain mills, consisting of the combination, with the mill-room, of a mill-box, a steamsupply pipe leading into the miltbox, a stop cock in said pipe, a water-supply pipe, with openings into the mill-room, a stopcock in said water-pipe, a drop-lever connected with stop-cocks in said steam and water pipes, respectively, and means for supporting said lever, substantially as described, and devices,

substantially as described, for causing the same to fall from the effects of a dust-explosion within the mill-box, whereby the steam and water cocks are simultaneously turned on, substantially as and for the purposes set forth,

7. The combination of the mill-room, the mill-box, a steam-supply pipe leading into the mill-box, a stop-cock in said pipe, a watersupply pipe with openings into the mill-room, a stop-cock on said Water-pipe, a drop-lever connected with stop-cocks in said steam and water pipes, respectively, and means for supporting said lever, substantially as described, and devices for causing the same to fall from the effects of fire extending outside of the millbox, whereby the steam and water cocks are simultaneously opened, substantially as and for the purposes set forth.

8. The combination, with the mill-box, of the vent-pipe V, lever L, supporting-rod X, slotted block Y, key K, cap Z, and rod 2, connecting said cap and key, the steamsupply pipe Q, provided with a stop-cock, f, rod 1", connecting said lever with the said cock f of the steamsupply pipe Q, all constructed and operating substantially as and for the purpose Set forth.

9. The combination, with the mill-box,.of the vent-pipe V, cap Z, block Y, key K, rod 2, pivoted lever L, connection X, rod 0", and the water-supply pipe T, provided with cock f, all constructed and operating substantially as described.

In testimony \vhereofl havehereunto affixed my signature this 14th day of July, A. D. 1883.

CHARLES JOHN HEXAMER.

\Vitnesses:

' RIoH. F. BOEHME, J OSEF EDELMANN.

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