US551602A

US551602A - Pneuiviatic-dispatch-tube system

Info

Publication number: US551602A
Authority: US
Publication date: 1895-12-17
Anticipated expiration: 1912-12-17

Description

A'. WQ PEARSALL. BNEUMATIC DESPATGHTUBE SYSTEM.v

y (NoModel.)-

No. 551,602.. Patented De. 17, 1895'.

UNITED STA-@Tits VAT-ENT l ALBERT WQ PARSALL, oir-NEW YORK, N. Y.,Ass1GNOn'ro THE METEO-R -DnsPA'r'cn COMPANY, or PORTLAND, MAINE.r

v PNEuMATic-DISPATCH-Tujss SYSTEM.

, SPECIFICATION To all whom it may concern:H v

Be it known-that I, ALBERT 'W. PEARSALL, of NewYork, county of New York,- and State of New York, Ahave invented-new and useful Improvements in.'Pneumatic-Dispatch-Tube Systems; and I hereby declare that the following is a full, clear, and rexact description 'of the invention, which will enable -others skilled in the art to which it appertains to make and use the same.'

My invention relates. topa new and useful improvement in pneumaticdispatch-tube systems in which pressure behind the. carriers is usedtodispatch the same from one part of the system to the other, in distinction from vacuum systems in which the carriers are drawn along by the vacuum created in front thereof, and it especially -relateavtog means for starting into circulation the air-v pressure which is normally dormant when' carriers are not being passedv through the sys- 4 tern-that is, I mean there is Yno circulation of pressure through the systemso tliatin the normal condition of the apparatus the press'-l ure is not continually circulating through the system, but there is only a certain pressure v in the system, which is suicient to hold the" valves and other necessary'parts of the system in their closed positions, and the' said pressure is not in circulation', but simply lies dormant.v

My invention further relates to a valve by means of which the pneumatic circuit is opened or closed, depending entirely upon the pressure acting onv said valve," which, when the pressure is full and not circulating, has the eiiect of closing said valve and cutting o the pneumatic circuitthat is, it cuts oi the outlet for the air from the system and thereby prevents circulation of the pressure throughv the system, and consequently prevents aloss of power in thc pneumatic-dis-l patch-tube system, which as at present construcied and arranged has a large percentage of loss, owing to the circuit being open and the pressure conslantl y passing through the tubes whether ille carriers are passing therethrough or not, but by the arrangement I have provided thc pressure passes through the system und continues so in circulation v only whcga carrier has been inserted into forming pea-'of' sewers Patent No. 551,602, dated December '17, 189s. `Application filed April'25, 1895. Serial No. 547,138. (Ng model.) I

- the-system to be dispatched from one point matie-circuit valve to drop and thereby open the pneumatic circuit through the syst-em, which acts as a propulsive force against the carriers and propelsthe same from the point of insertion to the point of discharge. Without providing means `for a certain'escape of ble-to open the said valve; butbjy lpermitting a temporary discharge of vthe pressure 'the carriers, the free air remaining in the system is' -not suicient 4tov hold the valve closed, and the same opens by gravity and provides an outlet. for the pressure and thus completes the pneumatic circuit through the system, andthe carrier driven along vthe system by the pressure'in its rear passes to the desired point where it is discharged, and the pressure which had been started into circulation topropel the carrier bypressure on its rear immediately' passes, fafter the discharge of the carrier, onto the circuit-regulating valve and closes the sameand cuts oi the outlet of the pressureand thereby stops lthe circulation of said pressure .through the syst-em, and the system is then in its normal condition and has no circulation of pressure therethrough, which, however, is started :into

the system to escape by the insertion of a carrier, which escape of air so reduces the`A pressure in the system as tocause the pneuthe air from the system it would be-impossiv from thefsystem," caused-by the :insertion of circulation 'and draws its supply from a suitable source at the insertion of each carrier.

From the above .it will .be seen that my invention broadly consists in a new and useful improvement in .pneumatic dispatch -tubc motion, in my system .is only applied or put into circulation to act as a propelling medium by a `reduction voi pressure in said system systems,whereby the power, which, in systems as at present constructed, 'is' constantly inwhen a carrier has been introduced, and my y IOO civA

the pressure upon the introduction of the carrier into the system, so that'the carrier is transmitted from one point to another, and immediately upon its discharge the pressure which has driven it acts on said valve and cuts off the outlet for the pressure and thereby stops the circulation of said pressure.

In the accompanyingdrawings, which form a part of this application, and which illustrate a constructionembodying my invention, Figure l is a side elevation of a pneumatic-disi patcl1tube system and showing the terminals with their valves and the circuit-regulating valve in section. Fig. 2 is a detail side elevation of the circuit-regulating valve. Fig. 3 is a central crosssection through the circuit-regulating valve. Fig. 4 is a detail Asectional view of a part of the system and showing therein a valve closing and opening at either the cashiers or salesmans station, through Which the carriers are introduced into the system. Fig. 5 is a reversed detail plan view of said valve.

Like letters of reference refer to like parts throughout the several views.

' From the salesmans station A is a line of tubing ll, which passes to the terminal C located at the eashiers station D. In the tubing 'at said station there is provided a valve Bl pivvotcd at B2, and normally closing an opening into the tubing by the pressure in said system, and when it is desired to insert a carrier the opera tor presses the carrier against said. valve, which yields to said pressure, and When the carrieris introduced the valve closes the opening by the pressure in the system. The terminal. C consists of an outer curved guidingplate C' and an inner curved guiding-plate C2, between which the carrier passes when re.

eeived from the tube B, and at the extreme inner end of the said terminal at' the extremity of the inner curved guiding-plate C2 a guiding-strip C is secured, which extends to the bottom of the terminal, and it permits` the pressure coming through the terminal C to ypass across and down through the tube E, but at the same time guides the carrier to the outlet ci the terminal closed bythe valve C4, and this valve consists oi two leaves C5 and C, Ajoined together by a suit-able connectingrod C7, and is pivoted to the terminal at The area of the leai C exposed to the pressure in the system being greater than the area of the leaf C5, the said valve is held in this closed position by the pressure in the system, and the momentum of the d i seharging carrier sutiicient 'to open the valve (J4 to permit the dischargeof the carrier, and in stantly upon said discharge the ,pressure on the larger leaf closes the said valve and holds it in its closed position, as shown. The tube E is connected to a chamber F, located at the cashiers station D, and it has at its upper end a valve F secured to au arm F2 and pivoted in the interior of said chamber tolugs F3, cast or otherwise secured to the chanisuitable soft washer F4 fitting against the upper side ot' the chamber F and around and closing the opening F5, and there projects downwardly from said valve a shield F, against which the pressure passing through the system acts, and assists in holding said valve F' closed against the opening F", and

in the normal condition of the parts the valve remains closed, due to the pressure against the under side, but Whena carrier is forced against said valve through the opening Fithe valve opens and the carrier passes into the chamber F and down through the tube B into the downwardlydischarging terminal II, which is provided i i' i a thin strip of metal or guide-rod Il to d ect and guide the carrier to the valve J, which is pivoted at J and consists of two leaves Jl and J, which are of a construction and operate the same as described for the valve C", and as soon as the carrier is discharged the pressure acting on the leaf J'vvhieh has a greatcrarea, closes the valve and holds it in its closed position. The pressure in the system then continues downwardly through thev tube G to the circuitregulating valve Ii, and acts on said valve as hereinafter de scribed.

The pressure-valves C* and J arc substam tially of a construction and operaie substantiall),Y the same, as the pressurevalve shown, described, and claimed in Letters Patent No. 527,073, dated October 9, 189i, and granted to the Meteor Despatch Company of Maine, as my assignee. The pressure coming from a suitable source of supply passes through a suitable reducing-valve X, and thon through the tubing Il, terminal C, tube E, chamber F, tube G terminal H, tubo G, and through a coupling Gi into a central chamber l/ of the regulatingvalvc K. This valve has an upper chamber K2 and a lower chamber Kil, which latter chamber is provided with a coupling li* leading to an outlet-pipe K5 to the atmosphere. Thevchambers K and K2 are separated by a llexible4 diaphragm L, secured to a veri ical rod L,ivhieli, at its lower end, has a suitable valve lll adapted to open and close the opening lll between the chambers K and K3. The pressure in the system, as previously described, upon reaching the chamber K' of the circuit-regu- 1 lating valve K acts on the diaphragm L and valve M, and the said diaphragm having a larger area of surface exposed to said pressure is moved upwardly, as shown in full lines, Fig. 3, and ri .iscs the valve M, thereby closing the openingli', and said opcniu being closed and there being no out-letter the pressure the circulation is immediately stopped' and the pressure in the system lying dormant is sufficient to close all the valves in the sysicm'a'nd preventloss of pressure. Non when a carrier is introduced through the vulvcll'or vulve F' a certain amount ol' the dormant pressure in the system escapes to the ai mosphere. and the pressure being thus reduced theva l\ e .ll dropsl by gravity and provides :in opening to the at berF, and on its upper side is provided with i ,l mosphere iorthopressu ro, :rs1 Irc freeii r i u the IOO 'l 4, The chamber Kislpiovi 551,602.r l I s sistem is not sullcient to close the same; and t e'carrier. having beehfmserted prevents the pressure started' intocirculation from a suitv able supplyfrom passing through the system 5 and acting on the Adiaphragm, 'as vall of said pressure cannot pass thecarrier in the tube; bjt/thecarrienon eringI at its station /allows the -full ,vol'ugiu 5" the system to-ru :o phragm Il, andel ing lthe valve IVI-,fa

peiling. M by liftfull lines, Fig. 3.

ion to the upwardzmovelinentpf the diaphragm L to prevent the torapid sing of the same,

I5 and thenvalve Nis providedgwith an 'opening N locatedA in the t' p of-said chamber, and as said diaphragmdropsatmospheric pressure is drawn into thefcliamberi? through the opening- N, and a's saiddiaphragm L rises the press- 2@ ure the chamber'retardsathetoo rapid rise of' saidjrdiaphragm'-`` andgthus acts to 4cushion the up-.tyard l movementf- 'of tlie .fsame,1 as the pressure insaidzchamberisretarded in its lescapefthrough. the small-"openingNq'r The 2 5 '-.valveNgthus acts as a means' forallowingthe Y:airs to-fpass into, the chamberK?, and'also actsf lto regulate the passage of.l air; so'gthat #thev up- Ward' movement of the diaphragni-L. isregfiif vlatedby the air in thechambr K1 ;o -LFrom the above it -will be seen that in the normal" condition of the parts and when no carrier-is being transmitted throughthe systefmfth pressure in said system closes the valve`4 M and 3 5 necessary to create a circulation through the system, and as long as no carrier is introduced the pressure liesdormant in the system and holds all the Working parts in proper position; but when a carrier is introduced, a certain 4o portion of the air escaping, the pressure is red uced and tlivalve M drops from the opening M vandthus provides an opening to the atmosphere for the pressure', and the pressure is immediately started into circulation to 45 drive the vcarrier to its proper station, and immediately @the air contained in ncl-faction the dia.-

ed to actas a cush- '..of the pressure at all by on valve opens to establish a propelling current and closes on the exit of the carrier.

-' provided carriers and with a regulated air inlet, an air thus closes the outlet, which is upon the discharge of the carrier the pressurecomi'g from the suitable source of supply passes on and acts yon the diaphragm L and igmediately closes the outlet to the atmosphere, sud` consequently the circulation` 5o of pressure is immediately stopped. From this it, will be ySeethat the pressure for transmitting of carriers ifsuly used When the-carlriers are introducedintothe system to. befy dispatched from loneI point tmnther, audi from this a great saving of power necesslly results, Whereas in the old system a greatloss of 'power is incurred by the continued use times without regard to whether the carriers are being transmitted or not.

Having thus ascertained the nature of my invention, what I claim is 1. In a pneumatic dispatch tube system, provided with Valved inlets and outlets for the carriers`,1an air outlet, and a valve for said outlet adapted to be opened by the reduction of pressure in the system and closed by vthe restoration of the normal pressure Wherethe introduction of the carrier thesaid 2. In a pneumatic dispatch tube system, with valved inlets and outlets for outlet, and a valve for said outletadapted to be opened by the reduction of pressure in the system and closedby the restoration of the normal pressure whereby ou the introduction of the carrier the said valve opens to establish a propelling current and closes on the exit of the carrier:

In testimony whereof I have signed my name to this specification, in the presence of two subscribing Witnesses, on this 11th day of S 5 April, A. D. 1895.

ALBERT W. PEARSALI..

Witnesses:

S. II. TROW, E. L. IIARLoW.