US1723476A - Fire extinguisher - Google Patents

Description

Aug, 6,

'w. E. EVERITT FIRE EXTINGUISHER Filed April 50, 1928 gnoentoc W66? 1?- Ereri it arfonwq Patented Aug. 6, 1929.

WALTER E. EVERITT, OF SEATTLE, WASHINGTON.

FIRE EXTINGUISHER.

Application filed April 30, 1928.

This invention relates to tire extinguishera, for projecting dry powder over flames.

The objects of the invention are to provide a lire extinguisher, with a container for dry powder, with a cylinder mounted through one end of the container, and. a plunger for forcing the powder from the container through a rifled discharge tube opening from the other end of the container, with means for automatically preventing the powder from entering the cylinder, with means for preventing the powder from escaping from the container except when the plunger is operated, and means for previ-inting the air outside the container from coming into contact with the powder while in the container. Another object being to further improve the form of fire extinguisher for which I have been granted Letters Pat ent of the United States, No. 1,652,105.

These and various other features of novelty and invention will appear from the detailed description, taken in connection with the single sheet of accompanying drawings, forming a part of this application.

Referring to the drawings: lligure 1, is a longitudinal sectional front view through the improved fire extinguisher; Figure 2, is a longitudinal side view of the extinguisher with the container in section; Figure 3, is a cross section view taken on lines of Figure 1; and Figure 4, is a cross section view taken on lines 4-4: of Figure 1.

Like numerals on the different figures, represent like parts. i

1 indicates a containerndapted to hold a supply of dry powder to de discharged therefrom on flames. 2 a filler cap over an opening at the top of the container through which the powder is poured into the container. 3 indicates a cylinder which extends through the container, with a threaded collar 4, projecting from the top end thereof; the cylinder provided with a pirton, preferably in the form of a cup leather 5, suitably secured on the lower end of an operating rod 6, by means of holding nuts 7 and 8.

The cup leather is backed with a metal washer cup 9, for guiding the rod and for preventing the leather from buckling upward. A suitable hole 10, is provided through the washer 9 adjacent the nut 7, and another suitable hole 11 is provided through the leather at a point near, but not opposite Serial. No. 273,853.

the hole 10, to permit air to pass therethrough when the rod. drawn outward. The outer edge of the leather at such times will slightly part from the washer 9, but when the rod is pinched inward the leather will be compressed against lhe washer 9 and holes 10 and 11 closed thereby and thus the air in the cylinder beneath the piston will be comnxessed.

A guide and. closure cap 12, is threaded over the collar 41, with a suitable hole 13 in the center thereof for the rod 6 to slide therein, and keyhole slots 14: on opposite sides thereof permit the passage of air into the cylinder when the piston is pushed down, and also to permit lugs 15, on opposite sides of the rod 6, to pass theretl'irough to the under side of the cap 12 at which point the rod may he turned and the lugs locked beneath the cap. A rubber gasket 16 above the lugs is readily cmnpressible, and pre vents the rod from working loose after the lugs have been "turned under the cap. A washer 9 is IDOSlljlOllBd. between the nut 8 and the central part of the leather, and an expanding spring 9" aids in holding the outer sides of the cup leather against the inner wallsof the cylinder.

In the lower end of the cylinder is p0sitioned a valve mechanism with a base, and side walls 17 a valve seat 18 and a rubber valve 19mounted on the lower end of a stem 20 above a holding washer 21 and nut 22 on the stem. Cross bars 23 and 24 serve as guides for stem which is slidably mounted theretl'irough, and a spring 25 between the bar 25, and a head 26, on the stem tends to hold the valve normally closed against the seat 18; but when the piston is pushed downward the air between the piston and the valve 19 will force the latter downward and permit the said enclosed air to be forced from the valve to drive the powder from the container as hereinafter shown.

A tubular elbow 27 is threaded at one end into the base of the wall 17 and through the adjacent side of the cylinder. The other end of the elbow is upturned with a threaded collar 28, and one end of a discharge tube 29 is attached. to the collar by a swivel nut 30 rotatably mounted over the tube 29 above a collar 31 on the end thereof. The tube 29 is carried upward on an angle to near the top of the container 1, and there bent at right angles sidewise downward and upward to form a gooseneck or trap 32, and thence bent and carried downward to the base of the container and projected through the bottom thereof to form a discharge nozzle 33. The downturned portion of the tube 29 is twisted for approximately the lower half thereof to provide spiral ridges 34, in its walls whereby the inner walls thereof will present a rifled surface, and impart a rotary motion to the air and powder when forced outwardly therethrough, for increasing the velocity and line of travel of the powder. Across the mouth of the nozzle is provided a trap door 35, held b a triangular hinge 36. A spring 37 a xed at one end to the bottom of the container extends over the hinge and normally holds the door closed across the mouth of the nozzle, but when the powder is forced from the container the trap door is opened by the pressure thereof till the triangular part of the hinge is turned and the free end of the spring then bears against the other face of the hinge and holds the door open till manually closed. A flange 1 on the container protects the door.

Along the sides of the tube 29 are suitable openings as 38, 39 and 40 to permit the air to escape therethrough from the tube into the container when driven from the cylinder, and to permit the air and powder mixed therewith to pass from the container into the tube 29 and be thence forced and ejected through the nozzle 33. The hole 39 near the top of the tube 29 permits the entry of powder into the tube when only a small supply thereof remains in the container and the instrument is being used to project the powder upward, and the hole 40 near, the lower end of the tube permits a similar advantage when a small supply of powder is used and the powder is being ejected downwardly. The gooseneck or trap effectually prevents any of the powder passing from the tube 29 into the part 29 except when driven by the air pressure while in use.

When kept ready for use, the container is maintained full of dry powder, the piston and its actuating rod held dowfn by the lugs under the cap piece 12, and the trap door closed to prevent circulation of air from the nozzle to dampen the powder in the tubes or container. In event of fire the operator turns the rod 6 till the lugs can be withdrawn through the slots 14, and then rapidly reciprocates the rod and piston, and a constant stream of powder is ejected from, the nozzle to cover the undesired blaze. As the piston is drawn upward the air above in the. cylinder rushes through the small holes 10 and 11 in the washer and cup leather, into the space above the check valve 19, then when the piston is forced down, the cup leather is compressed against the washer 9 and the hole closed thereby, and the pressure in the space beneath the piston forces the valve 19 to open, and the compressed air then fiows through the tubes 29 and 29 carrying the powder gathered through the holes 384i(), the pressure automatically opening the trap door and projecting the powder from the nozzle. The. check valve 19 is normally closed, and at all times prevents the powder from the container or tube 29 from entering the cylinder and interfering with the operation of the piston.

Having described my invention I claim as new 1. In a fire extinguisher adapted to project a stream of dry powder, a powder container, with a cylinder mounted longitudinally in the container, a piston slidably disposed in the cylinder, a rod attached to the piston and extending out from the cylinder for operating the piston, a guide cap across the top of the cylinder and means for holding the rod in a fixed position when the apparatus is not used, inlets through the piston for passage of air through the piston, and means for automatically closing the inlets when the piston is pushed inward, a discharge tube extending from the cylinderat a point beyond the piston, toward the opposite end of the container, and there bent and extended back to and through the bottom of the container for the discharge of powder, holes through the walls of the tube for the entrance of powder, and a trap door pivotally mounted across the mouth of the tube to normally prevent the escape of powder from the mouth of the tube and to pre vent the entrance of air into the tube from the mouth thereof, the door adapted to automatically open when air pressure is created in the tube by the piston.

2. In a fire extinguisher adapted to roject a stream of dry powder, a container for powder, a cylinder mounted in the container, a reciprocating piston slidably disposed in the cylinder for forcing air there from, a discharge tube extending from the cylinder in bent form through the container and opening through the bottom of the same with inlets in the sides of the tube for entrance of powder, a check valve mounted in the cylinder between the piston and the discharge tube to prevent the powder contacting with the piston, a portion of the tube adjacent the open end thereof twisted to form spiral ribs in the walls thereof to guide, and increase the velocity of powder when forced therefrom by the air pressure caused by the operating piston.

3. In a fire extinguisher adapted to dis charge a stream of dry powder, a owder container, a cylinder mounted in t e container, with a piston and rod slidably disposed in the cylinder for forcing sir therefrom, a perforated tube extending from the cylinder at a point beyond the piston, and carried thence toward the opposite end of the container and there bent at substantially right angles in concave form to provide a gooseneck trap to prevent the powder in the perforated part of the tube from passing beyond the trap except when the piston is operated, the tube extending back entire from the trap substantially parallel with the perforated part, through the container and through the bottom thereof with the end of the tube terminating in a nozzle for the discharge of powder therefrom, when the piston is operated.

4:. In combination, a fire extinguisher adapted to project a stream of dry powder, consisting of a powder container, a cylinder mounted in the container, one end of the cylinder projecting beyond one end of the container, with a cap over the outer end of the cylinder and a rod slidably disposed through the cap, a piston attached to and reciprocated in the cylinder by the rod, a valve in the piston, adapted to automatically open when the piston is drawn outward and to close when the piston is pressed inward, a check valve mounted in the cylinder beyond point of travel of the piston adapted to open when the piston is pressed inward and to automatically close when the piston is drawn outward to prevent the powder from contaeting with the piston, a perforated tube extending from the cylinder at point beyond the check valve, and extending toward the opposite end of the container, and there bent to form a trap to normally prevent the passage therethrough of powder, the tube bent backward from the trap and carried thence entire to and through the bottom of the container and there terminating in a nozzle for the discharge of powder from the container, spiral ribs in the tube adjacent the nozzle thereof, and a trap door pivotally mounted over the mouth of the nozzle and ada ted to automatically open when powder mm the tube is forced from the container by the action of the piston.

In testimony whereof I affix my signature.

WALTER E. EVERITT.

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