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Publication numberUS3659809 A
Publication typeGrant
Publication dateMay 2, 1972
Filing dateAug 5, 1970
Priority dateAug 5, 1970
Publication numberUS 3659809 A, US 3659809A, US-A-3659809, US3659809 A, US3659809A
InventorsCook Ross
Original AssigneeCook Ross
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Push-pull pneumatic tube system
US 3659809 A
Abstract
The push-pull pneumatic tube system includes two terminals connected together by a single tube. One terminal is selectively subjected to a positive or negative pressure in order to push the carrier to the remote terminal or to pull the carrier to the near terminal. A simple spring gravity or friction held door may be used on the receiver part of the near terminal without danger of its being blown open, by providing a bypass operative in response to the existence of positive air pressure.
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United States Patent n51 3,659,809

Cook [451 May 2, 1972 54) PUSH-PULL PNEUMATIC TUBE FOREIGN PATENTS OR APPLICATIONS SYSTEM [72] Inventor: Ross Cook, 85 Eastfield Drive, Rolling Hills, Calif. 90274 [22] Filed: Aug. 5, 1970 [21] Appl. No: 61,259

[521 U.S.Cl..... ...243/19,243/2,243/24 [51 1 Int. Cl v i v ..B65g 51/32 {58] Field 0! Search ..243/2, 24, 19

[50} References Cited UNITED STATES PATENTS 3,282,531 11/1966 Stewart ..243/19 1,813,487 7/1931 Emerson ..243/19 Germany ..243/2 Germany ..243/19 Primary Examiner1-larvey C. Homsby Attorney-Flam & Flam [57] ABSTRACT The push-pull pneumatic tube system includes two terminals connected together by a single tube. One terminal is selectively subjected to a positive or negative pressure in order to push the carrier to the remote terminal or to pull the carrier to the near terminal. A simple spring gravity or friction held door may be used on the receiver part of the near terminal without danger of its being blown open, by providing a bypass operative in response to the existence of positive air pressure.

13 Claims, 5 Drawing Figures Patented May 2, 1972 3 Sheets-Sheet 2 fxvvs/vroe. Boss Coax J'A 1 3A BACKGROUND OF THE INVENTION This invention relates to a conveyor tube system especially adapted for use in a drive-in bank. One prior art approach is to use two tubes, both subject to vacuum, one of the tubes being used to send a carrier from the inside terminal cage to the outside drive-in station, and the other being used to send a carrier tube from the outside drive-in station to the inside terminal cage. This arrangement, however, is an extravagance because the carrier is not ordinarily sent from both stations simultaneously. One carrier and tube, in fact, are adequate to serve all of the usual requirements. Thus, for example, the customer may transmit cash, checks and his bank book in the carrier and subsequently receive back his bank book showing the appropriate entries; or, the customer may send a check together with appropriate identification, and thereafter receive the cash. Thus, the return transmission is ordinarily dependent upon first receiving the contents of the carrier. Accordingly, a single tube system should sufiice.

Two-way single tube systems have long been known. One of the two terminals is selectively subjected to a positive or negative pressure in order to send a carrier under pressure to the remote station and receive the carrier from the remote station, respectively. This arrangement works satisfactorily except for the fact that the pressure blows the door of the near terminal open; the door must be kept closed if adequate pressure is to be developed to send the carrier to the remote station. If the power or blower unit is located adjacent the teller's terminal, the teller can be depended upon to close the terminal door and to move a latch into position. However, in the interests of saving inside space, it is usually desirable to locate the power or blower unit outside and near the customer terminal. But the customer cant be relied upon to move a latch into position.

The primary object of this invention is to make it possible to use a simple spring, gravity or friction held door on the outside terminal of a push-pull system in which there is no danger of the door blowing open despite the fact that the power unit is located adjacent the outside terminal.

It has been proposed to use a terminal in which the door is driven by a motor to open and closed positions. To prevent injury to a hand left in the door, a friction coupling must be provided between the motor and the door. Positive air pressure may overcome the friction to open the door with consequent loss of driving power.

BRIEF SUMMARY OF THE INVENTION In order to achieve the foregoing object, I provided a simple adapter mechanism that bypasses pressurized air from the receiver space closed by the door. Valves are moved into proper position in response to the existence of positive or negative pressure. On the negative pressure mode, one valve opens while another closes in order to subject the terminal box itself to a negative pressure whereby the carrier is impelled into the terminal space. On the positive pressure mode, a bypass is effected.

BRIEF DESCRIPTION OF THE DRAWINGS A detailed description of the invention will be made with reference to the accompanying drawings. These drawings, unless described as diagrammatic or unless otherwise indicated, are to scale.

FIG. 1 is a diagrammatic view of a pneumatic tube system incorporating the present invention.

FIG. 2 is a front elevational view of the outside of customer terminal.

FIG. 3 is a vertical sectional view taken along a plane corresponding to line 3-3 of FIG. 2.

FIG. 4 is a transverse sectional view taken along a plane corresponding to line 4-4 of FIG. 3.

FIG. 5 is a fragmentary section view similar to FIG. 3 but illustrating a modified form of the present invention.

DETAILED DESCRIPTION The following detailed description is of the best presently contemplated modes of carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention since the scope of the invention is best defined by the appended claims. Structural and operational characteristics attributed to forms of the invention first described shall also be attributed to fonns later described, unless such characteristics are obviously inapplicable or unless specific exception is made.

FIG. 1 shows an inside or teller terminal 10 and an outside or customer terminal 12. A carrier (not shown) is sent back and forth between the terminals 10 and 12 through a single pneumatic tube 14. Opposite ends of the tube 14 connect with fittings 16 and 18 at the bottom of the terminals. An adapter box 20 to be hereinafter described forms the lower section of the outside terminal 12.

The carrier is moved by the push-pull" method in which one of the terminals, in this instance the outside terminal 12, is subjected either to a positive or negative air pressure. When subject to a positive air pressure, the carrier is blown back to the inside terminal. When subjected to a negative air pressure, the carrier is sucked to the outside terminal. The pressure is generated by a blower 22 having an air inlet 24 and an air outlet 26. The outlet 26, at which a relative positive pressure is developed, can be connected to a fitting 28 at the bottom of the terminal 12 while the inlet 24 is subjected to the ambient. Alternatively, the inlet 24, at which a relative negative pressure exists, can be connected to fitting 28 while the outlet 26 is connected to the ambient. The alternate modes of connection of the blower 22 to the terminal 12 are determined by a suitable four-way valve 30. The four-way valve 30 may be remotely controlled, as by suitable switches adjacent the teller's terminal 10. It may also be controlled in response to the carrier being dropped into one end or the other of the tube 14.

The upper section of the customer terminal 12 is a receiver 32 (FIG. 3) in which the arriving carrier comes to rest. The receiver 32 is mounted on top of the adapter by suitable means. In order to arrive in the receiver, the carrier C (shown in phantom lines) must pass through an antechamber A of the adapter 20 into the bottom of which the tube fitting 16 projects. A vertical partition 34 divides the the interior of the adapter 20 into front and rear sections, the front section being the antechamber and the rear chamber being a pressure chamber B into the bottom of which the blower fitting 28 projects.

The arriving carrier passes beyond the upper end opening 36 of the tube fitting l6 and then into the lower end opening 38 of a guide 40. The upper end of the guide 40 is situated in the frontal part of the receiver 32. Its forward portion is cut away to form a semicylindrical cradle part 42 for the carrier C.

A spring catch 44 is pushed rearwardly as the carrier C arrives at its station and then returns to hold the carrier in place where it is accessible upon opening of a translucent access door 48. The door 48 is biased to close. This could be done by hinging the door at the top for gravity bias. However, for best access, the door is hinged at the bottom. Accordingly, a spring 50 is provided. If desired, a magnetic latch (not shown) may be provided to impose a slight restraint against opening.

The carrier C is caused to arrive at the station 12 by subjecting the receiver box 32 to a vacuum or negative pressure. The negative pressure at the fitting 28 is conducted to the receiver 32 via an opening 52 at the top of the pressure chamber B. The opening 52 is normally closed by a valve closure 54 spring mounted in the chamber B. A negative pressure in the chamber B causes the valve closure 54 to open.

The partition 34 has an opening 58 normally closed by a valve flap 60 pivotally mounted in the antechamber. The flap 60 is gravity-biased to close. Upon the existence of negative pressure in the pressure chamber B, the flap 60 snaps tightly closed. Air from the tube 14 is caused to flow in a circuit as follows: tube 14, antechamber A, receiver 32, pressure chamber B, to the blower section side. The carrier is thus drawn to the terminal 12.

in order to return the carrier C to the teller terminal, the latch 44 is released by a solenoid 62. The carrier drops into the tube 14. The fourway valve then imposes a positive pressure at the pressure chamber B. Under such circumstances, the spring mounted valve 54 remains closed.- The flap valve 60 is caused to swing to engage the edges of the oblique opening 38 of the guide 40. The air pressure is thus conducted to the tube 14 in a circuit that bypasses the receiver 32. The carrier is urged to move in the tube 14 while the receiver 32 is isolated from the positive pressure. The door 48 is not subjected to any air pressure tending to open it. Moreover, inadvertent opening of the door in no way disrupts the operation.

As the valve 60 moves from the full-line position shown in MG. 3 to the phantom-line position, the receiver 32 is momentarily subjected to a pressure surge. This surge is precluded from moving the door 48 by the aid of a surge valve 64. This valve is in the form of a resilient flap that closes a small opening 66 at the back of the receiver 32. The valve 64 has much less inertia than the door and thus opens first, preventing a pressure build-up that might open the door.

In the form of the invention shown in FIG. 5, the same adapter 20 is provided as before. The door 102, in this instance, is moved by a friction drive roller 104. The drive roller may be operated by an electric or pneumatic motor which may be remotely controlled. The friction drive roller engages a ring drive 106 attached to the door 102. A traveling carrier check 108, in the present instance, is mounted on the ring drive 106. The door has a cradle 110 for the carrier 112. As the door opens, the carrier 112 is accessible. Only the friction between the ring 106 and the roller 104 holds the door in closed position. The receiver is isolated from any positive pressure that might open the door and break the circuit.

1 claim 1. In a pneumatic tube system of the push-pull type:

a. a pair of terminals;

b. a single tube connecting the terminals for transporting therethrough a pneumatic tube carrier in either direction between the terminals;

c. means forming a pressure chamber at one of said terminals;

d. said one of said terminals having a receiver chamber for said pneumatic tube carrier;

c. said receiver chamber having an exterior access door normally yieldingly held in closed position;

f. a power unit for selectively subjecting said pressure chamber to a positive or a negative pressure;

g. means operative upon the existence of a negative pressure at said pressure chamber for establishing an air circuit including, in series, said tube, said receiver chamber and said pressure chamber; and

h. means operative upon the existence of a positive pressure at said pressure chamber for establishing an air circuit including, in series, said pressure chamber and said tube with said receiver chamber excluded from the circuit.

2. The pneumatic tube system as set forth in claim 1 in which an adapter box provides said pressure chamber at one part thereof, and provides an antechamber at another part thereof, said receiver chamber being connected to said adapter box to register both with said antechamber and said pressure chamber, said tube being connected to said antechamber; said circuit establishing means including:

a. a first check valve between said antechamber and said pressure chamber that opens in response to the existence of a positive pressure in said pressure chamber and that closes in response to the existence of a negative pressure in said pressure chamber;

b. a second check valve between said receiver chamber and said antechamber that opens in response to the existence of a negative pressure in said pressure chamber and that closes in response to the existence of a positive pressure in said pressure chamber; and

c. a third check valve between said receiver chamber and said pressure chamber that opens in response to the existence of a negative pressure in said pressure chamber and that closes in response to the existence of a positive pressure in said pressure chamber.

3. The pneumatic tube system as set forth in claim 2 in which said first and second check valves include a common flap closure swingable in said antechamber between a valve seat fonned about an opening between said antechamber and said pressure chamber and a valve seat formed about an opening between said antechamber and said receiver chamber.

4. The pneumatic tube system as set forth in claim 2 together with a fourth check valve between said receiver chamber and the ambient and arranged to open only in response to an excess pressure in said receiver chamber; said fourth check valve having a much lower inertia than said door whereby transient pressure rise in said receiver chamber is inadequate to open said door.

5. The pneumatic tube system as set forth in claim 1 in which said door is spring biased to close.

6. The pneumatic tube system as set forth in claim 1 in which said door is moved to open and close by a pulley segment and a friction roller.

7. The pneumatic tube system as set forth in claim 1 in which said one terminal is located to be accessible in a drive-in establishment, said other terminal being located inside a building structure.

8. In a pneumatic tube system of the push-pull type:

a. a pair of terminals;

b. one of said terminals having an upper section comprising a receiver box and a lower section comprising an adapter box;

c. said adapter box having a partition dividing said box into an antechamber and a pressure chamber;

d. a single tube extending between the terminals, one end of said tube being connected to the bottom of said antechamber;

e. a power unit for selectively subjecting said pressure chamber to a positive or a negative pressure;

f. said receiver box having spaced openings respectively to said antechamber and said pressure chamber;

g. said receiver chamber having an access door normally yieldingly held in closed position;

h. means responsive to the existence of a negative pressure in said pressure chamber for establishing an air circuit including, in series, said tube, said antechamber, said receiver chamber and said pressure chamber; and

i. means responsive to the existence of a positive pressure in said pressure chamber for establishing an air circuit including, in series, said pressure chamber, said antechamber and said tube with said receiver chamber excluded from the circuit.

9. The pneumatic tube system as set forth in claim 8 in which said pressure responsive means include:

a. a first check valve between the antechamber and said pressure chamber that opens in response to the existence of a positive pressure in said pressure chamber and that closes in response to the existence of a negative pressure in said pressure chamber;

b. a second check valve between said receiver chamber and said antechamber that opens in response to the existence of a negative pressure in said pressure chamber and that closes in response to the existence of a positive pressure in said pressure chamber; and

c. a third check valve between said receiver chamber and said pressure chamber that opens in response to the existence of a positive pressure in said pressure chamber.

10. The pneumatic tube system as set forth in claim 9 in which said first and second check valves include a common flap closure swingable in said antechamber between a valve seat formed about an opening between said antechamber and said pressure chamber and a valve seat formed about an opening between said antechamber and said receiver chamber.

11. The pneumatic tube system as set forth in claim 9 together with a fourth check valve between said receiver chamber and the ambient and arranged to open only in response to an excess pressure in said receiver chamber; said fourth check valve having a much lower inertia than said door whereby transient pressure rise in said receiver chamber is inadequate to open said door.

12. The pneumatic tube system as set forth in claim 9 in which said one terminal is located to be accessible in a drive-in establishment, said other terminal being located inside a building structure.

13. A terminal for a pneumatic tube system of the type wherein a carrier is transported either to or away from said terminal through a single tube comprising:

a receiver chamber,

an adapter chamber attached to the bottom of said receiver chamber and having a vertical, apertured partition dividing the adapter chamber into an antechamber and a pressure chamber, said single tube being connected to the bottom of said antechamber,

a carrier receiving cradle in said receiver chamber and having a carrier entrance guide extending downwardly into said antechamber in alignment with said single tube, the upper end of said cradle having openings permitting air flow into another portion of said receiver chamber,

a flap valve pivotally mounted within said antechamber to swing between a first position blocking the aperture in said partition and a second position blocking the bottom of said entrance guide,

a spring mounted valve attached within said pressure chamber to block an opening into said receiver chamber other portion when positive pressure is present in said pressure chamber, and to unblock said opening when a negative pressure is present in said pressure chamber,

a stop member for permitting unimpeded entrance of a carrier into said cradle and for retaining said carrier within said cradle thereafter,

a power unit for selectively subjecting said pressure chamber to a positive or a negative pressure,

negative pressure establishing an air circuit including, in series, said tube, said receiver chamber and said pressure chamber, thereby sucking a carrier from said tube through said antechamber and said guide into said cradle,

release of said stop member permitting said carrier to drop into said tube, subsequent positive pressure in said pressure chamber swinging said flap valve into said second position blocking air flow into said receiver chamber and establishing an air circuit including, in series, said pressure chamber, said antechamber and said tube, thereby urging said carrier through said tube away from said terminal.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1813487 *Oct 18, 1928Jul 7, 1931Lamson CoMethod of and apparatus for controlling air flow in pneumatic systems
US3282531 *Dec 7, 1964Nov 1, 1966T V Bank Equipment CorpPneumatic dispatch system
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3948466 *Dec 26, 1974Apr 6, 1976Mosler Safe CompanyPneumatic carrier send and receive terminal
US3964693 *Dec 23, 1974Jun 22, 1976Thomas William DCounterbalanced door mechanism for teller carrier receive tube of a pneumatic banking system
US4032082 *Nov 3, 1975Jun 28, 1977Adam WeissmullerCombined transmit and receive pneumatic carrier terminal with mechanical carrier catch
US4352603 *Aug 15, 1980Oct 5, 1982Diebold IncorporatedPneumatic tube system teller terminal construction
US4913598 *Sep 6, 1988Apr 3, 1990Dozier Charles WPneumatic transport system terminal
US5299891 *Oct 1, 1992Apr 5, 1994Diebold, IncorporatedPneumatic tube system
US6474912May 1, 2001Nov 5, 2002Joseph L. MeeksPneumatic mail delivery system
US6652198Jun 6, 2002Nov 25, 2003Security Systems Equipment Corp.Air valve
US6827529 *Jul 30, 1999Dec 7, 2004Lancer Ice Link, LlcVacuum pneumatic system for conveyance of ice
US7306407 *Sep 14, 2006Dec 11, 2007Diebold, IncorporatedPneumatic transport tube system
US7309192 *Sep 14, 2006Dec 18, 2007Diebold, IncorporatedPneumatic transport tube system
US7311471 *Sep 14, 2006Dec 25, 2007Diebold, IncorporatedPneumatic transport tube system
US7311472 *Sep 14, 2006Dec 25, 2007Diebold, IncorporatedPneumatic transport tube system
US7311473 *Sep 14, 2006Dec 25, 2007Diebold, IncorporatedPneumatic transport tube system
US7311475 *Sep 14, 2006Dec 25, 2007Diebold, IncorporatedPneumatic transport tube system
US7314337 *Sep 14, 2006Jan 1, 2008Diebold, IncorporatedPneumatic transport tube system
US7314338 *Sep 14, 2006Jan 1, 2008Diebold, IncorporatedPneumatic transport tube system
US7316526 *Sep 14, 2006Jan 8, 2008Diebold IncorporatedPneumatic transport tube system
US7318690 *Sep 14, 2006Jan 15, 2008Diebold, IncorporatedPneumatic transport tube system
US7320562 *Sep 14, 2006Jan 22, 2008Diebold, IncorporatedPneumatic transport tube system
US7341406 *Sep 14, 2006Mar 11, 2008Diebold, IncorporatedPneumatic transport tube system
US7686546 *Sep 12, 2006Mar 30, 2010Diebold IncorporatedPneumatic transport tube system
US7686547 *Mar 7, 2008Mar 30, 2010Diebold, IncorporatedPneumatic transport tube system
WO2002062618A1 *Feb 4, 2002Aug 15, 2002Gatto DominiqueInstallation for cash transfer between a site and a vehicle
Classifications
U.S. Classification406/112
International ClassificationB65G51/34, B65G51/00, B65G51/26
Cooperative ClassificationB65G51/26, B65G51/34
European ClassificationB65G51/26, B65G51/34