US 3635607 A
A vacuum pump comprising a closed housing, an elastometric diaphragm in the form of a cup therein, said diaphragm having a rim, said rim being sealed into the wall of the housing, said diaphragm dividing the housing into two chambers one including the interior of the diaphragm and the other being at the exterior thereof, a constant vacuum outlet for the latter chamber and a pair of check valves which are substantially the same but reversed for the chamber at the interior of the diaphragm.
Description (OCR text may contain errors)
0 United States Patent [151 amasmm Grise 1 Jan. 18, W72
 VACUUM PUMP 1,627,257 5/1927 Stevens ..417/395  Inventor: Frederick J. arise, North Brookfield 2,738,731 3/1956 Browne ..417/394 SS Primary Examiner-Robert M. Walker  Assignee: Novelty Tool Co., Inc., Spencer, Mass. ch R F  Filed: Apr. 20, 1970 ABSTRACT  Appl. No.: 29,989 I A vacuum pump comprising a closed housing, an elastometric diaphragm in the form of a cup therein, said diaphragm having  11.5. CI ..4l7/394 a rim Said rim being sealed into the n of the housing, Said [5 1 1 Cl "Fo4b 43/10 F04b 45/00 diaphragm dividing the housing into two chambers one includ-  Field of Search ..417/394, 395 ing the interior ofthe diaphragm and the other being at the 5 6] R t d terior thereof, a constant vacuum outlet for the latter chamber e erences I e and a pair of check valves which are substantially the same but UNITED STATES PATENTS reversed for the chamber at the interior of the diaphragm. 1,268,780 6/1918 Jay ..417/395 3 Claims, 41 Drawing Figures PATENTEB m 1 a 1972 I Z r]! M 50 Z j Z0 8 JV 50 20 4 7-52 46 I 7 z! 32 26 J W 4 J6 2% 4 jg 5a z? J6 F 3 5 & 0 50 6 5 52 9- 115 KM 50 J? 46 20 if 32 4-30 M50 i 32 42 44 74 a I I 32 26 34 36 I y 76 35 L'J z I k 32 Z4 f rarcia rick 626 7332 r 34 I? as 36 737 W? vAcuuM PUMP BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION A housing is provided, said housing being generally cylindrical and having at one end a connection for a vacuum line and at its opposite end two connections, each of the latter being provided with a check valve one of which allows intake of fluid into the housing, the other allowing fluid to be ejected from the housing under pressure. There is a cup-shaped elastometric diaphragm having a bottom extending in relatively close association with respect to the vacuum line connection and at its open end having a rim which is substantially permanently sealed into the wall of the housing adjacent the two check valves. There is a notched rim surrounding the vacuum line connection within the housing facing a projecting continuous seal on the exterior of the bottom of the cuplike elastometric diaphragm. The diaphragm divides the housing into two chambers, one at the exterior of the cup-shaped diaphragm and the other at the interior thereof, the vacuum connection being for the exterior chamber and the check valves being in the interior chamber.
There is also a small bleed hole to the atmosphere in the housing for allowing the atmosphere to enter into the housing between the exterior surface of said cuplike diaphragm and the vacuum line connection, i.e., into the exterior chamber.
The vacuum may be constant and gradually causes the diaphragm to stretch and the bottom of the diaphragm to approach the vacuum connection. When the bottom of the cuplike diaphragm reaches the notched rim circumjacent to the vacuum connection, the latter partially cuts off the vacuum connection from the exterior chamber of the housing, between the cuplike diaphragm and the inside wall of the housing. Of course atmospheric pressure has been constantly leaking into the exterior chamber in the housing through the bleed hole, but as yet the pressure does not equal the degree of vacuum. The bottom of the diaphragm is thus stopped, and the effect is that the sidewall of the diaphragm bulges until it contacts the wall of the housing about the notched rim. The bulging of the diaphragm increases the intake of fluid into the interior chamber through the intake check valve until the contact just described, which causes a definite, instant cut off of the vacuum from the housing. The pressure increases very suddenly and this has the effect of collapsing the diaphragm to its normal position, thus forcing the fluid out of the exit check valve in a spurt and under considerable pressure. The action then repeats and does so as long as the vacuum is in effect.
This action is completely continuous and the size of the bleed hole to the atmosphere and the degree of vacuum determines the actual cycling of operation of the valve and the degree of pressure with which the fluid spurts out.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a view in elevation illustrating the valve;
FIG. 2 is a section illustrating the valve in normal condition of the diaphragm;
FIG. 3 is a similar view illustrating the action of the diaphragm, and
FIG. 4 shows the diaphragm in its maximum stretched condition.
PREFERRED EMBODIMENT OF THE INVENTION A main-housing part generally indicated at 10 has a closed end 12 and in the case illustrated an open end at I4. In the closed end there is a central connection 16 for attachment to a vacuum line and surrounding this connection at the inside of the end 12 there is an annular projecting rim 113 having a series of notches 20 therein. This part of the housing is conveniently molded of clear plastic so that the action, to be described, is clearly visible.
A housing part generally indicated at. 22 is provided with a rim 24 corresponding to rim 26 at the open end M of the housing part for the purpose of substantially permanently sealing therein the outstanding rim 2% of an elastometric cupshaped diaphragm generally indicated at 30. The rim 2% is provided with extension ridges 32, 32 which fit into corresponding recesses in the rims 24 and 26 for the purpose of solidly gripping the rim 28 so that it cannot creep out under any circumstances. The diaphragm divides the housing into two chambers, one exterior of the diaphragm and the other exterior thereof.
The housing part 22 is provided with two annular valve holding portions 34 and 36, each of which is provided with a connection for a tube as at 38 and 40. Each of the annular portions 34 and 36 is provided with a check valve of conventional design, these being indicated at 42, 441. One check valve allows only pressure inwardly through its connection into the in terior of the cuplike diaphragm 3t) and the other check valve allows only ejection of fluid material from the cuplike diaphragm 30.
The cuplike diaphragm 30 has an upstanding wall 416 and a closed end portion 48 at the exterior of which there is an upstanding continuous ring 50.
With the parts as shown in FIG. 2 and assuming a vacuum line connected at 16, the exterior chamber between the housing I0 and the elastometric diaphragm 30 will begin to be exhausted even though a slight amount of atmospheric air leaks in through a small hole 52. The bottom 48 of diaphragm 30 is pulled upwardly toward the source of vacuum, the diaphragm stretching, see for instance FIG. 3, and eventually the exterior surface of the diaphragm bottom as contacts the rim 1b. When this happens, it is more difficult for the vacuum to extract air as this air can only pass through notches 20 inwardly from the interior of housing 10 to the connection 16. Nevertheless the vacuum still acts on the diaphragm and since the center portion of the bottom 48 thereof cannot proceed any further upwardly, the elastometric wall 46 bulges, see FIG. 4, until the ring 50 contacts the inside surface of the bottom 12 0f the housing part It). At this instant, the diaphragm is substantially full of fluid.
At this instant, all of the vacuum action is cut off from the exterior chamber, i.e., between the interior wall of housing part It) and the bulged out exterior wall 46 of diaphragm 30, so that the atmospheric leak through the hole 52 sharply causes a relatively high pressure between the housing and the diaphragm which causes the latter to actually snap from the FIG. 4 position back to the original FIG. .2 position.
When this snap off occurs, the wall of "the diaphragm as well as the bottom thereof quickly snap inwardly from FIG. 4 to FIG. 2 position, and since check valve 33 will not allow any return, some fluid in the diaphragm is expelled in a spurt or jet through the valve 414 and connection 40.
It will therefore be seen that a pulsating action is provided for supplying fluid in seriatim jets and this action will last as long as there is a reservoir of fluid connected to connection 38 and a vacuum to connection I6. The sealing arrangement of the rims 24 and 26 together with rim 28 prevents any dislodgment of the parts and the only moving parts are the diaphragm itself and the check valves at 412 and Ml.
Increased vacuum will cause a faster action, and varying the size of hole 52 will also affect the action, but otherwise it will be seen that an extremely simple pulsating fluid pump is provided and this pump will operate as long as the vacuum is applied and the fluid reservoir is in operation.
I. A vacuum pump comprising a housing, a connection for admitting vacuum to said housing in one area thereof and a pair of check valves in a different area thereof, said check valves operating independently and oppositely to each other,
an elastometric diaphragm in said housing, said diaphragm said housing including a sidewall greater in diameter then the diameter of the cup, providing an annular space between the walls, said space being at least a part of the first chamber,
vacuum from the vacuum connection acting upon said diaphragm to cause the same to stretch toward it and the cup walls to expand toward the housing wall reducing the volume of the first chamber and thereby causing fluid material to enter into the second chamber, the bottom of the cup being constructed and arranged to substantially cutoff the vacuum relative to said first chamber to provide that the pressure entering from the atmosphere overcomes the vacuum action and causes the diaphragm to snap back from its stretched condition expelling fluid in a jet through one of the check valves.
2. The vacuum pump of claim 1 including means initially partially shutting off the vacuum and causing the bottom of the diaphragm cup to bend into contact with the housing about the vacuum connection and wholly shutting off the vacuum substantially simultaneously with the expansion of the sidewall of the cup.
3. The vacuum pump of claim 1 including a rim about the vacuum connection at the interior of the housing, the bottom of the cup coming in contact with the rim and stopping further elongation of the cup at a certain point in the stretch of the cup.