US3040970A

US3040970A - Dual aspirating apparatus

Info

Publication number: US3040970A
Application number: US17050A
Authority: US
Inventors: William F Wismar
Original assignee: Specialties Development Corp
Current assignee: Specialties Development Corp
Priority date: 1960-03-23
Filing date: 1960-03-23
Publication date: 1962-06-26
Anticipated expiration: 1979-06-26
Also published as: GB920136A

Description

June 26, 1962 w. F. WISMAR 3,

DUAL ASPIRATING APPARATUS Filed March 25, 1960 3 Sheets-Sheet 1 I L- i' INVENTOR willamJ-T wismar ATT EY June 26, 1962 w. F. WISMAR DUAL ASPIRATING APPARATUS 3 Sheets-Sheet 2 Filed March 25, 1960 Jwmml l 2 A INVENTOR william 1? 101m;

ATT NEY June 26, 1962 w. F. WISMAR 3,

DUAL ASPIRATING APPARATUS Filed March 23, 1960 3 Shee'hsSheet 3 INVENTOR ORNEY United States Patent 3,040,970 DUAL ASPIRATING APPARATUS William F. Wismar, Union, NJ., assignor to Specialties Development Corporation, Belleville, N.J., a corporation of New Jersey Filed Mar. 23, 1960, Ser. No. 17,050 3 Claims. (Cl. 230-103) The present invention relates to aspirating apparatus, and, more particularly, to such apparatus for inflating the bags of flotation equipment such as collapsible boats, rafts, escape chutes and similar devices.

Heretofore, various types of aspirating apparatus have been utilized to supplement compressed gas or air with entrained ambient air. It has been found that, in cases where the bags to be inflated had a large volumetric capacity, inflation could not be accomplished within the desired period of time with such apparatus; and that, in order to meet the time requirement by increasing the pressure of the inflating media, the bags became vulnerable to physical damage at the commencement of inflation to unfold the bags. While the bags could be made stronger to withstand greater forces exerted thereon, this would require increasing the weight thereof. However, since such flotation equipment is generally airborne, weight penalties cannot be tolerated.

Accordingly, an object of the present invention is to provide apparatus adapted to increase the rate at which the inflating media is introduced into the bag without increasing the pressure thereof.

Another object is to provide such apparatus wherein the flow of high pressure aspirating medium is divided to reduce the pressure thereof to a value whereby the pressure of the aspirating medium will not damage the bags.

Another object is to provide such apparatus which is adapted to cooperate with valving for bleeding low pressure gas or air into the bags after aspiration ceases to main the bags fully inflated.

A further object is to accomplish the foregoing in a simple, practical and economical manner.

Other and further objects of the invention will be obvious upon an understanding of the illustrative embodiment about to be described, or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.

A preferred embodiment of the invention has been chosen for purposes of illustration and description, and is shown in the accompanying drawings, forming a part of the specification, wherein:

FIG. 1 is a plan view of aspirating apparatus in accordance with the present invention equipped with valving for bleeding low pressure air into the bag from a source of compressed gas or air, the source being partially shown.

FIG. 2 is a front elevational view, partly in section, of the apparatus shown in FIG. 1, the source and the valving being omitted.

FIG. 3 is an end elevational view of the apparatus shown in FIG. 2 as seen from the right side thereof.

FIG. 4 is an enlarged longitudinal sectional View of the valving for controlling aspiration and bleed flow of the compressed medium.

Referring to the drawings in detail, there is shown in FIG. 1 aspirating apparatus 10, a source of compressed gas or air such as a conventional cylinder 11 partially shown, and valving 12 connected between the aspirating apparatus and the cylinder, the function of which will be described in detail hereinafter.

As shown in FIGS. 1 to 3, the aspirating apparatus generally comprises a body 14, aspirating nozzles 15 con nected to the body, valves 16 mounted on the underside of the body, an inlet tube 17 secured to the body and connected at one end to the valving 12, a pressure reducer 18 connected at one end to the other end of the tube 17, and a conduit 19 connecting the other end of the pressure reducer to the body to deliver compressed medium thereto.

The body 14 comprises a plate portion 20 adapted for securement to an inflatable bag B in the usual manner, a plurality of adjacently spaced tubular portions 21, two being shown by way of example and each having a flared opening 22 at its upper end and :a valve seat 24 at its lower end located within the bag B, a formation 25 between the tubular portions having a vertical bore 26 therein which is open at the top and closed at the bottom, and a fitting 27 formed with a stem 28 secured in the bore 26 and having a head 29 formed with a flow dividing chamber 30 at its upper end to which the nozzles 15 and the conduit 19 are connected.

The nozzles 15 are formed of a tube 31 having a generally circular section 32 overlying one of the openings 22 and being provided with a plurality of spaced downwardly facing apertures 34 for directing gas under pressure into the openings 22 to aspirate ambient air therewith. Preferably, the tube 31 is bent upon itself and has parallel adjacent ends connected to apertures 35 provided in pairs in the head of the fitting 27. As shown herein, the tubular aspirator portions 21 are diametrically opposite the fitting 27 and the apertures are formed at opposite sides of the fitting. The degree of aspiration can be preset by adjusting the distance between the nozzle apertures 34 and the flared openings 22 before securcment of the stem 28 into the bore 26.

The valves 16 are of the poppet type and each comprise a valve member 36 for a seat 24, and a spring 37 biased between the valve member and a cross-bar 38 supported by posts 39 secured to the underside of the body 14.

While the valving 12 may be of the type which simply releases the compressed gas at about 3000 p.s.i. from the cylinder and allows it to flow through the pressure reducer 18 and the conduit 19 to the nozzles 15 whereby ambient air is aspirated and the valve members 36 are unseated to admit gas and air to enter the inflation bag B until the pressure in the cylinder drops to about 300 p.s.i. and the valve members reseat, valving can be utilized with the apparatus shown which utilizes the low pressure gas remaining in the cylinder to maintain the pressure in the bag at a desired value and to make up for leakage.

As shown in FIG. 4, such valving comprises a body 40 having an inlet 41 in communication with the cylinder 11, an outlet 42 connected to the tube 17, a valve seat 44 between the inlet and outlet, and a valve member slideway 45 and a threaded bore 46 in concentric alignment with the valve seat; a pilot valve and actuator assembly 47 secured in the bore 46 to provide a chamber 48; and a main valve member 49 having a bleed aperture 50 for conducting gas from the cylinder into the chamber 48 in back of the piston so that the valve member is held on its seat by the gas pressure and the force of a spring 51 biased between the valve member and the portion of the assembly 47 in the bore 46.

The pilot valve and actuator assembly 47 comprises a body having a threaded plug portion 54 for the bore 46 provided with a pilot valve chamber 55 and a valve seat 56 and having a tubular actuator casing 57; a pilot valve member 58 in the chamber 55 urged on the seat by a spring 59 and provided with a stem 60; a plug 61 threadedly secured in the open end of the casing 57 provided with an outlet 62 adapted for connection to the aspirator body as about to be described; an actuator member 64 slidably mounted in the casing 57 for engaging the pilot valve stem 60 and provided with a bleed aperture 65 for establishing communication between the port of the pilot valve seat 56 and the outlet 62; a spring 66 biased between the actuator member 64 and the plug 61 for effecting movement of the actuator member to unseat the pilot valve member; and a latch 67 for retaining the actuator member.

In operation, the latch is withdrawn to cause the spring 66 to move the actuator member 64 to unseat the pilot valve member 58, whereby compressed gas in the chamber 48 is vented and the main valve member 49 unseats to deliver gas to the aspirator. When the pressure or" the gas in the cylinder drops to about 300 psi, the spring 51 reseats the main valve member and aspiration ceases to allow the valves 16 to reclose. Gas is now bled through the

apertures

59 and 65 at a low pressure to the outlet 62 from Where it is conducted by a conduit 68 to a port 6 9 in the aspirator body in direct communication with the interior of the inflation bag (FIGS. 1 and 2).

The valving 12 as just described constitutes the subject matter of application for United States Letters Patent Serial No. 26,753, filed May 4, 1960.

From the foregoing description it will be seen that the present invention provides improved aspirator apparatus for rapidly inflating flotation equipment and maintaining the same in proper inflated condition.

As various changes may be made in the form, construction and arrangement of the parts herein, without departing from the spirit and scope of the invention and without sacrificing any of its advantages, it is to be understood that all matter herein is to be interpreted as illustrative and not in any limiting sense.

I claim:

1. Aspirating apparatus comprising a pair of adjacent tubular elements each formed with an opening, means for delivering gas under pressure positioned between said elem'ents and having a pair of apertures therein at two opposite sides thereof with each pair of apertures facing one of said elements, and a tube for each element, each tube being bent upon itself and having a generally circular section overlying one of said openings and formed with a plurality of holes for directing gas under pressure into said openings to aspirate ambient air therewith and each tube having two parallel adjacent ends connected to one of said pairs of apertures.

2. Aspirating apparatus comprising a body having a pair of adjacent tubular elements each formed with an inlet opening at one end and an outlet opening at the other end, means for delivering gas under pressure including a nozzle overlying each of said inlet openings and formed with a plurality of apertures for directing gas under pressure into said inlet openings to aspirate ambient air therewith and direct the same through said outlet openings to its point of use, and a normally closed valve at each of said outlet openings operable to be opened by gas under pressure and aspirated air, said body including a passageway connected to said delivering means for oy-passing said valves when said valves are closed and directing gas to the point of use.

3. Aspirating apparatus comprising tubular means formed with an inlet opening at one end and an outlet opening at the other end, means for delivering gas under pressure including a source of gas under pressure and a nozzle overlying said inlet opening of said tubular means for directing gas under pressure into tubular means to aspirate ambient air therewith and direct the same through said outlet opening of said tubular means, and a normally closed valve at said outlet opening of said tubular means operable to be opened by gas and aspirated air at a given pressure, passageway means for by-passing said tubular means, and valve means in said gas delivering means for directing gas to said nozzle at a given rate when the pressure of the gas is above a predetermined value, and for directing gas to said by-pass passageway means at a lesser rate when the pressure of the gas is below said predetermined value.

References Cited in the file of this patent UNITED STATES PATENTS 787,279 Coe Apr. 11, 1905 923,490 Coe June 1, 1909 1,484,013 Ehrhart Feb. 19, 1924 2,866,593 Bowman et a1. Dec. 30, 1958 FOREIGN PATENTS 255,395 Great Britain July 22, 1926