US1067999A

US1067999A - Fire-extinguishing syringe.

Info

Publication number: US1067999A
Application number: US69025812A
Authority: US
Inventors: Hiram Merritt
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-04-12
Filing date: 1912-04-12
Publication date: 1913-07-22
Anticipated expiration: 1930-07-22

Description

. H. MERRITT. Y FIRE BXTINGUISHING SYRINGE.

APPLICATION FILED APR.12, 1912.

Patented July 22, 1913.

UNITED STATES FiaTENT OFFICE.

HIRAM MERRITT, OF NEWBURGH, NEW YORK.

FIRE-EXTINGUISHING SYRINGE.

T0 all whom it may concern Be it known that I, HIRAM MERRITT, a

citizen` of the United States, residing at Newburgh, New York, have invented certain new and useful Improvements in Fire-EX- tinguishing Syringes, of which the following is a clear, full, and exact description.

This invention relates to a fire extinguishing syringe of the reservoir type, containing a reserve supply of fire extinguishing fluid which may be ejectedby a series of pumping strokes.

One of the objects of my invention is to improve the general construction of such devices whereby the operation is ni'ade more simple and eiiicient, and whereby the apparatus when not in use will be closed against leakage. The tire extinguishing fluid com- -monly employed in devices of this kind such as carbon tetrachlorid has an Obnoxious smell, and therefore any drip or leakage from the syringe when not in use is objectionable.

The invention is particularly ap licable to the type` of fire extinguishers w ich comprises a reservoir and a barrel or pump cylindexr in communication with the reservoir.

One of the objects of my invention is to reduce the force necessary to drive the piston on the forward stroke and to accelerate the filling movement of the liquid into the pump chamber on the return stroke.

My invention therefore comprises the general combination of parts and details of construction hereinafter specified, and it is to be understood that all variations within the spirit of my invention are broadly embodied in the appended claims.

ln the preferred embodiment shown in the drawings, Figure 1 is an elevation of the device with the portion of the nozzle cut away; Fig. 2 is a vertical section of the saine complete; Fig. 3 is a cross section through the line 3 3 of Fig. 2; Fig. 4 is a cross section through line 4 4 Fig.`2; and Fig. 5 is an enlarged detail of the charging cap and inlet valve.

Referring more particularly to the drawings, the syringe as a whole comprises an outer cylindrical shell l having within the same a tubular partition 2 spaced from the inner wall of the shell so as to form two separate inner compartments. the central cnmjivartment or pumping chamber 4 and the annular compartment 3 outside thereof.l all as shown clearly in Fig. 2. A per- Specification of Letters Patent.

Patented July 22, 1913.

Application led April 12, 1912. Serial No. 690,258.

forated partition 2a at the upper end of compartment 3 provides free communication between the reservoir to this end of the pumping chamber 4, as shown. At the other end of compartment 3 are preferably located one or more inlet valves 16 providing communication between the reservoir and pumping chamber at this end. As shown, eachvalve 16 preferably consists of a spring pressed .disk 17 normally held closed by spring 18 and adapted to be opened inwardly by pressure from the outside and closed'by pressure from the inside.

The ejecting end of the syringe is provided with the usual closure or head 9 preferably screw threaded on the shell 1 and having therethrough the outlet passage 21. A tapered nozzle 18 is also preferably screw threaded on the end of closure 9 having therethrough a continuation of outlet 2ll and also provided with a spring pressed valve plug 19 normally closing outlet passage 21 under pressure of spring 2O as shown. It is obvious that this valve 19.will give way to an outward pressure from within the syringe so thatl the contained fluid may be easily ejected. The syringe is charged through opening 23 at the upper end of /shell 1 which is covered by the charging cap 13 preferably screw threaded on the closure head 8 as shown. The cap 13 is also provided with a spring pressed inlet valve 14 normally held closed by spring 15. whereby air is a-:nniited to the, interi-v r of said shell to maintain normal atmospheric pressure within the cylinder during the pumping action.

Working within the pumping chamber 4 is an ordinary form of piston 5 having rod 6 extending through closure head 8 to a' handle 7. The sliding joint of rod 6 is closed against leakage by the usual packing arrangement 22. and said rod 6 is also preferably provided with a bayonet collar 10 fixed thereto as shown in Fig. 2, and adapted to coperate with a pin 12 upon closure 8 as shown in Fig. 1. The piston 5 is also .preferably provided with a tapered projection 5a at its lower end, adapted to seat within a tapered socket 9 of head The piston j rod 6 is adapted to be forced downwardly and firmly locked in position by means of its bayonet joint 1l, 12 to firmly seat the said tapered projection 5 within socket Wand thus seal the shell against any possible leakage at either end.

Ytents of the pumping chamber 3 through y adapted to be reeiprocated repeatedly with-- The operation of the device is already apparent fromthedescril'ition heretofore given, but may be briefly recounted as follows: The entire space within shell 1 may be first charged with fire extinguishing liquid through inlet L3. The upward stroke of piston 5 both sucks liquid through valve 16 from the reservoir 3 into pumping chamber 4, and also forces the liquid behind piston 5 around through openings 2b of partition 2 into reservoir .3, so as to mechanically force the liquid in fr'ont of piston k downward stroke of the piston of course ejeets the conoutlet 21, and this operation may be repeated until the entire contents of both pumping chamber and reservoir are exhausted. lt will be observed that the present construction not only provides for a pumpinv action by suction upon the withdrawal of piston 5, but also by providing free communication between the central pumping chamber 4 and reservoir 3, a force pumping act-ion takes place behind the piston 5 so as to more effeetually bring the liquid in front of the piston. This force pumping action of course takes place behind piston 'i whether air or liquid is within said central pumping chamber.

What I claim as new is1-- 1. A fire extinguishing hand-syringe comprising in combination la reservoir, a pumping chamber adjacent thereto, a piston adapted to be reciproeated repeatedly within said pumping chamber to empty the same, said pumping chamber communicating with said reservoir at the forward and rear ends of said pumping chamber, and an air inlet valve for admitting air on the forward stroke of said piston and preventing an outward How of air on the back stroke of said piston whereby the air in the rear of said reservoir is compressed, and the flow of liquid accelerated from said reservoir into the forward end of said pumping chamber` and means for preventing a return {iow of the liquid from the forward end of said pumping chamber to said reservoir on the forward stroke of said piston.

2. A fire extinguishing handsyringe comprising in combination a reservoir, a pu1nping chamber adjacentV thereto, a piston in said pumping chamber to empty the sami'. .said pumping chan'iber eommunicating with said reservoir at the forward and rear endsv of said pumping chamber, and an air inlet valve for admitting air on the forward i Stroke of said piston and pI'c\'ciitiiig au dutward flow of air on the back stroke of said piston whereby the air -m the rear of said l reservoir is compressed, and the [low of liquid accelerated from said reservoir into the forward yend of said pumping chamber, and valves between said reservoir andthe forward end of said pumpingl chamber openN ing from said reservoir to said pump chaluber and preventing a return flow of the liquid from said pump chamber to said reservoir on the forward Stroke of said piston.

3. A fire extinguishing hand-syringe comprisiA in 'combination an outer shell normally closed to the atmosphere and having within the same a reservoir, a pumping chamber a:-'iacent to said reservoir, a piston adapted to be reciprocated repeatedly within said pumping chauiber to empty the fame said pumping chamber eenununicatiugr with the reservoir at the forward and rear ends of said pumping chamber, an air inlrt valve for admitting air rn the forward stroke ot' said pis-ten and preventing an outward tion of air on the back stroke of said piston wl'lereby the air in the rear of said reservoir is compressed and the flow of liquid accelerated frcm said reservoir into the forward end ofr said pumping chamber, means for preventing a return flow of the liquid from the forward end of said pumping chamber to said reservoir on the forward stroke of said piston, said syringe having a discharge outlet, and means in said discharge outlet for preventing an out *ard flow of the liquid cn the backward stroke of said piston.

4. A fire extinguishing hand-syringe comprising in combination an outer shell normally closed to the atmosphere and having within the same. a reservoir, `a pumping chamber adjacentJ to said reservoir, a pistcn adapted to be reciprocatrd repeatedly within said pumping chamber to empty the same, said pumping chamber communicating with the reservoir at the forward and rear endsof said pumping chamber, an air inlet Avalve for admitting air on the forward stroke of said piston and preventing an outward tioiv of air on the back stroke of said piston whereby the air En the rear of said reservoir is compressed and the 'iicw of liquid accelerated from said reservoir into the forward end of said pumping ehauiber, and a valve in connection with said discharge outlet to prevent' dripping cf the, liquid through said discharge outiet on the backward strelte of said piston.

Signed at Newburgh, N. Y., this 10th dav ai' April wie.

Hman Mriuiu'rr.

litnessesr Erm ldeCi:.\cmiN, FRANK J. lliiwiUNs.