CA1050084A - Aerator with metal casing having inner plastic elements moldable in one piece - Google Patents
Aerator with metal casing having inner plastic elements moldable in one pieceInfo
- Publication number
- CA1050084A CA1050084A CA273,148A CA273148A CA1050084A CA 1050084 A CA1050084 A CA 1050084A CA 273148 A CA273148 A CA 273148A CA 1050084 A CA1050084 A CA 1050084A
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- Canada
- Prior art keywords
- downstream
- aerator
- casing
- upstream
- ledge
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE
An aerator for use on water faucets having a metal casing and a one-piece plastic insert that includes both the upper diaphragm for directing a large number of water jets in a downstream direction and a ledge for hold-ing a screen to mix said water jets with air. The one-piece molded plastic insert is held in the casing due to compression between the downstream end of the faucet and an inturned ledge or lip at the downstream end of the metal casing. The one-piece insert defines air intake passageways passing along the inside wall of the casing and entering the mixing space between said diaphragm and the screen. The plastic material is soft enough so that the upper end of the one-piece plastic insert makes a substantial seal with the faucet. If some water does pass this seal, it enters the air intake passageways and passes out the downstream end of the casing. Slits are pro-vided in the side wall of the casing to enhance the molding of the insert.
An aerator for use on water faucets having a metal casing and a one-piece plastic insert that includes both the upper diaphragm for directing a large number of water jets in a downstream direction and a ledge for hold-ing a screen to mix said water jets with air. The one-piece molded plastic insert is held in the casing due to compression between the downstream end of the faucet and an inturned ledge or lip at the downstream end of the metal casing. The one-piece insert defines air intake passageways passing along the inside wall of the casing and entering the mixing space between said diaphragm and the screen. The plastic material is soft enough so that the upper end of the one-piece plastic insert makes a substantial seal with the faucet. If some water does pass this seal, it enters the air intake passageways and passes out the downstream end of the casing. Slits are pro-vided in the side wall of the casing to enhance the molding of the insert.
Description
~05(~(~84 This lnvention relates to an aerator for use in water f~ucets.
Aerators molded in one piece are well known, for example, my United States Patents 3,363,841, entitled Molded Water Aerators, granted January 16, 1968, and 3,27Q,964, entitled Molded Water Aerator, granted September 6, 1966, show all of the parts of an aerator, including the ~asing molded in one piece, e~cept that the met21 screens are separate and may be readily inserted into the molded aerator. It is desirable, however, in some cases, to use a metal casing for the aerator, and, consequently, there are a number of my prior patents which show such a casing with molded inserts capable of receiving a screen, see, for example, my United States Patents No. 2,799,487 - "Aerator ~Jith ~nitary Molded Inner Assembly", granted July 16, 1957; United States Patent No. 2,998,929 - "Water Aerators", granted Septe~ber 5, 1961; United States Patent No. 3,13Q,917 - "Water Aerator 'rlaving Improved Pre-~erating Disc", gre~nted ~pril 28, 1964;
United States Patent No. 3,13Q,918 - "Slotless Aerator", granted April 28, 1964; United States Patent No. 3,270,946 - "Self-Sealing and Deposit-Proof Aerator, granted September 6, 1966; British Patent No. 1,1~4,550, published April 2a, 1970; Italian Patent No. 85~,515, granted January 15, 1970.
The aforesaid patents, however, do not disclose a one-piece insert capable of being molded at the lowest possible price and providing all of the advantages which ~n aerator is capable of providing. Very satisfactory aerators utilizing an imperforate cylindrical casing containing both metal and plastic parts are well Icnown; see, for example, my United States ~'atent No. 2,998,927 entitled "Fluid Mixing Devices", granted Septen~er 5, 1961.
These devices, however, do not have the cost-saving advantage of a single one-piece molded insert. Moreover, they do not have the advantage of a simplified assembly, nor do t'hey have the advantage of ease of cleaning which allows t'he insert to be taken o~t, cleaned, and put bacli in the metal casing.
It i9, therefore, an obJect of my invention to provide an ~050(:~84 aerator-adapted to be attached to the spout end of a faucet-which comprises a metal casing and a low cost one-piece inscrt for the casing.
The aerating function is carried out with a very high degree of efficiency and problem.s of leakage bet~een the faucet and the aerator are overcome.
The structure of the aerator is such that there may not be required a washer between the aerator and the faucet.
Finally, the aerator can be formcd of plAstic in one piece, as it is easily moldable and requires a minimum amount of plastic material.
My new aerator employs a metal casing having threads at the upstream end for attaching it to the faucet. The casing is cylindrical in shape and has a small Inturned ledge or lip at its downstream end.
A generally cylir.drica' one-piece plastic insert snugly fits in said casing and has an upstrcarl cylindrical portion, the upstream end of which engages the downstream end of the faucet when the aerator is screwed onto the faucet. This insert also has ribs, the downstream end of which rests on said ledge so that ~he one-piece insert is compressed between the downstream end of the faucet and the ledge. The insert can be of material such as DELRI~ which is soft enough to form a substantial seal with the downstream end of the faucet when the aerator is compressed as aforesaid.
The one-piece insert has an upstrec~m perforated disc having at least one water discharge opening to thus increase the velocity of the water while decreasing its cross-section. The aforesaid ribs are integral with the perforated disc and are spaced apart. The ribs support and are integral with a ring, the upstream end of which is spaced from the downstream end of the disc to thus allow the air to enter the mixing space. Moreover, the d~nstream end of the ring includes means, such as a ledge, for receiving the mixing screen.
Downstream of the disc is a mixing space fed with air by an air ~50084 delive~)~ path. Tllis air dclivery patll i5 defined by the inner wall of the casing and the outer wall of the ring, and extends be~ween each pair of ribs.
There are slits e~:tending from the do~nstream ends of the ribs upstrea~ardly to tl-e do~nstream end of the upstream disc. These slits extend not only through the ribs but also through the wall that comprises the ring wllicll receives the screen. These slits are sufficiently narro~ to impair water flow through them. They enhancc removal of the plastic insert from the mold. Air may, however, enter through the slits.
~Ioreover, the ribs extend further downstream than the ring, to maximi7e flow of air into the aerztor. The lowermost part of the ring is preferably spaced upstream of the upstream side of the ledge so that air ~ay freely enter the air delive~y path. I~owever, the lowermost end of the ring may be as low as the upstream side of the ledge if the latter comprises a series of spaced teeth.
The space between the cylindrlcal portion and the inner side wall of the casing com~unicates with the air-delivery path so that if small amounts of water do pass the substantial seal, such water will pass along the inside wall of the casing and be deflected by the ledge towards the main body of water leaving the aerator.
The invention will now be described by reference to the accompany-ing drawlngs, in which:
Figure 1 is a top view of the one-piece plastic insert which forms a part of the invention;
Figure 2 is a cross-sectional view of Figure 1 taken along the lines of 2-2, Figure l;
Figure 3 is a cross-sectional view taken along lines 3-3 of Figure l;
Figure 4 is a side view of the plastic insert;
Figure S is a cross-sectional view of a modified form of aerator in which the perforations of the disc are conical; 2nd Figure 6 is a cross-sectional view of Figure 1 ta~en along lines 1~50084 6-6.
The aerator has a ~etal casing having threads at its upstream end and an inturned lip at its downstream end. A~ example of such casing where the threads are on the inner wall and casin~ is shown in Figure 3 where the casing 22 is provided with internal threads 32 and an inturned downstream ledge or lip 42. ~lother example of the casing is shown in Figure 5 where the casing 23 has external threads 33 near its upstream end and an inturned ledge or lip 42 at its downstre2m end. The casings of both Figures 3 and 5 are preferably cylindrical and imperforate along their side walls.
One form of the one-piece plastic insert is sho~7n in Figures 1, 2, 3, 4, and 6, for example. As shown in Figure 4, the one-piece plastic insert is generally cylindrical in shape and has a handle 40 projecting upstream-wardly from the insert to enable easy rer.loval of the insert from the caslng.
The one-piece plastic insert also includes a cylindrical upstream portion 11 of slightly smaller diameter than the inside wall of the casing.
The cylindrical portion 11 is integral with the disc portion 25 which in tur~
is integral witll the ribs 10. There is, moreover, a lower cylindrical portion 15 integral with the ribs 10, which portion includes a ledge 17 for supporting screen 18 which is prevented from moving upwardly by the projec-tions 19 which are integral with the disc 20. The disc 25 has perforations 26 for directing a plurality of water jets at the screen 18. The efficiency of aeration may be improved by incorporating a bridge 27 such as is sho~7n and described in my aforesaid United States Patent No. 3,363,841 - "Molded l~ater Aerators", granted January 16, 1968, or other turbulent generating means such as described in other of my patents, such as my other United States Patent No. 2,998,929 - "Water Aerators"~ granted September 5, 1961.
By incorporating such a bridge 27 integral with the remainder of the one-piece plastic insert, the water jets are appropriately conditioned so that upon striking the screen lo a very efficient aerating function occurs, thereby reducing the number of screens 18 that are needed for best operation of the aerator. The inlet air enters aro~md the inner wall of the ledge 42, ~05()084 proceeds upstrea~ardly hetweell thc ~ s 10 and enters the mixing space bet-ween the cylindrical disc 25 and the cylindrical portion 15 of the aerator.
While I have referred to the fact that the upstream end of the plastic insert creates a substantial seal against the downstreclm end of the metal faucet 13, it is understood that this seal may not be perfect and that, therefore, there may be some leakage of ~Jater through the seal. If this should occur, a ~lasher may be seated above portion 11, otherwise such water enters the space S between the outer wall of ~he cylindrical portion 11 and the inner ~all of casing 22 and flows downstrean~Jardly towards the main body of the water leaving the aerator. As a result, leakage between the aerator casing 22 and the faucet 13 is avoided. In the modified form of Figure 5, the casing has external threads 33, but the do~Jnstream end of the faucet has an inside ledge against which the cylindrical portion 11 may abut to constitute the substantial seal described above. A somewhat similar arrange-ment for attaching an aerator having external threads to a faucet is shown in severa] of my prior patents, for example, see United States Patent 3,270,965 entitled Self Sealing and Deposit Proof Aerator, granted September 6, 19~6; ~7nited States Pcatent 3>104,827, entitled Vandal~Proof Aerator, granted September 24, 1963; United States Patent 2,998,929, entitled Uater ~erators, granted September 5, 1961, and my aforesaid British and Italian patents.
The aerator of Figure 5 may have inverted cones 50 in place of the perforations 26 and may have a plurality of screens 18 instead of the sirgle screen 18 of Figure 2. Otherwise, the aerators of Figures 1, 2, 3, ar.d 4 on the one hand and Figllre 5 on the other hand are similar. In Figures 1 through 4 and 6, the perforations 26, of diaphragm 25 have a square or arcuate cross-section, as taught in my aforesaid prior United States Patent ~o. 3,130,917.
To enhance the effectiveness of molding the plastic insert in one piece, it is desirable to provide a slit 1~ in the ribs 10. In one form the slit extends from the downstream end of the insert to the lowe. level 1~50084 of the disc 25. In practicc, It has be~n fourld th2t w~len the s]it is approximately 0.3 mm. to 0.5 m~ 7ide, the water will not flood the space bet-ween the inner ~all of casing 13 ar.d the outer wall of cylindrical portlon 15.
Slit 4 allows the cylindrical portions 15 to move outwardly 25 the plastic insert is ren-oved from the nold. To further enhance the removal of the plastic insert from the mold, the ledge 17, for the screen 18, is inclined as shown.
It is noted that ribs 10 extend do~mstrea~wardly beyond the down-stream end of cylindrical portion 15 to provide ample space between inturned ledge 42 and cylindrical portion 15 for a larger quantity of air to enter the aerator.
The casing 22 (or 23) may be made of plastic material, or of elastic material such as rubber instead of metal, in which event the down-stream end of the casing may be distended and the insert placed in the casing through the opening in the downstream end thereof.
The lowermost end of cylindrical portion (ring) 15 should be posi-tioned at least as far upstream as the upstream side of ledge 42.
If the lowermost end of ring 15 is at the same level as, or only slightly upstream of, the upstream side of ledge 42, tl-at ledge should be constructed in the form of spaced teeth, as sh~.~n in my United States Patents No. 2,998,926, granted September 5, 1961, entitled "Aerator ~'ith Improved Air Supply"; No. 2,998,927, granted September 5, 1961, entitled "Fluid Mixing Devices"; No. 3,198,440, granted August 3, 1965, entitled "Aerator Structure and Legged Diaphragm Therefor". This permits air to enter between the teeth and pass between casing 23 and ring 15 to the mixing space downstream of the orifices 26 and/or 50.
Aerators molded in one piece are well known, for example, my United States Patents 3,363,841, entitled Molded Water Aerators, granted January 16, 1968, and 3,27Q,964, entitled Molded Water Aerator, granted September 6, 1966, show all of the parts of an aerator, including the ~asing molded in one piece, e~cept that the met21 screens are separate and may be readily inserted into the molded aerator. It is desirable, however, in some cases, to use a metal casing for the aerator, and, consequently, there are a number of my prior patents which show such a casing with molded inserts capable of receiving a screen, see, for example, my United States Patents No. 2,799,487 - "Aerator ~Jith ~nitary Molded Inner Assembly", granted July 16, 1957; United States Patent No. 2,998,929 - "Water Aerators", granted Septe~ber 5, 1961; United States Patent No. 3,13Q,917 - "Water Aerator 'rlaving Improved Pre-~erating Disc", gre~nted ~pril 28, 1964;
United States Patent No. 3,13Q,918 - "Slotless Aerator", granted April 28, 1964; United States Patent No. 3,270,946 - "Self-Sealing and Deposit-Proof Aerator, granted September 6, 1966; British Patent No. 1,1~4,550, published April 2a, 1970; Italian Patent No. 85~,515, granted January 15, 1970.
The aforesaid patents, however, do not disclose a one-piece insert capable of being molded at the lowest possible price and providing all of the advantages which ~n aerator is capable of providing. Very satisfactory aerators utilizing an imperforate cylindrical casing containing both metal and plastic parts are well Icnown; see, for example, my United States ~'atent No. 2,998,927 entitled "Fluid Mixing Devices", granted Septen~er 5, 1961.
These devices, however, do not have the cost-saving advantage of a single one-piece molded insert. Moreover, they do not have the advantage of a simplified assembly, nor do t'hey have the advantage of ease of cleaning which allows t'he insert to be taken o~t, cleaned, and put bacli in the metal casing.
It i9, therefore, an obJect of my invention to provide an ~050(:~84 aerator-adapted to be attached to the spout end of a faucet-which comprises a metal casing and a low cost one-piece inscrt for the casing.
The aerating function is carried out with a very high degree of efficiency and problem.s of leakage bet~een the faucet and the aerator are overcome.
The structure of the aerator is such that there may not be required a washer between the aerator and the faucet.
Finally, the aerator can be formcd of plAstic in one piece, as it is easily moldable and requires a minimum amount of plastic material.
My new aerator employs a metal casing having threads at the upstream end for attaching it to the faucet. The casing is cylindrical in shape and has a small Inturned ledge or lip at its downstream end.
A generally cylir.drica' one-piece plastic insert snugly fits in said casing and has an upstrcarl cylindrical portion, the upstream end of which engages the downstream end of the faucet when the aerator is screwed onto the faucet. This insert also has ribs, the downstream end of which rests on said ledge so that ~he one-piece insert is compressed between the downstream end of the faucet and the ledge. The insert can be of material such as DELRI~ which is soft enough to form a substantial seal with the downstream end of the faucet when the aerator is compressed as aforesaid.
The one-piece insert has an upstrec~m perforated disc having at least one water discharge opening to thus increase the velocity of the water while decreasing its cross-section. The aforesaid ribs are integral with the perforated disc and are spaced apart. The ribs support and are integral with a ring, the upstream end of which is spaced from the downstream end of the disc to thus allow the air to enter the mixing space. Moreover, the d~nstream end of the ring includes means, such as a ledge, for receiving the mixing screen.
Downstream of the disc is a mixing space fed with air by an air ~50084 delive~)~ path. Tllis air dclivery patll i5 defined by the inner wall of the casing and the outer wall of the ring, and extends be~ween each pair of ribs.
There are slits e~:tending from the do~nstream ends of the ribs upstrea~ardly to tl-e do~nstream end of the upstream disc. These slits extend not only through the ribs but also through the wall that comprises the ring wllicll receives the screen. These slits are sufficiently narro~ to impair water flow through them. They enhancc removal of the plastic insert from the mold. Air may, however, enter through the slits.
~Ioreover, the ribs extend further downstream than the ring, to maximi7e flow of air into the aerztor. The lowermost part of the ring is preferably spaced upstream of the upstream side of the ledge so that air ~ay freely enter the air delive~y path. I~owever, the lowermost end of the ring may be as low as the upstream side of the ledge if the latter comprises a series of spaced teeth.
The space between the cylindrlcal portion and the inner side wall of the casing com~unicates with the air-delivery path so that if small amounts of water do pass the substantial seal, such water will pass along the inside wall of the casing and be deflected by the ledge towards the main body of water leaving the aerator.
The invention will now be described by reference to the accompany-ing drawlngs, in which:
Figure 1 is a top view of the one-piece plastic insert which forms a part of the invention;
Figure 2 is a cross-sectional view of Figure 1 taken along the lines of 2-2, Figure l;
Figure 3 is a cross-sectional view taken along lines 3-3 of Figure l;
Figure 4 is a side view of the plastic insert;
Figure S is a cross-sectional view of a modified form of aerator in which the perforations of the disc are conical; 2nd Figure 6 is a cross-sectional view of Figure 1 ta~en along lines 1~50084 6-6.
The aerator has a ~etal casing having threads at its upstream end and an inturned lip at its downstream end. A~ example of such casing where the threads are on the inner wall and casin~ is shown in Figure 3 where the casing 22 is provided with internal threads 32 and an inturned downstream ledge or lip 42. ~lother example of the casing is shown in Figure 5 where the casing 23 has external threads 33 near its upstream end and an inturned ledge or lip 42 at its downstre2m end. The casings of both Figures 3 and 5 are preferably cylindrical and imperforate along their side walls.
One form of the one-piece plastic insert is sho~7n in Figures 1, 2, 3, 4, and 6, for example. As shown in Figure 4, the one-piece plastic insert is generally cylindrical in shape and has a handle 40 projecting upstream-wardly from the insert to enable easy rer.loval of the insert from the caslng.
The one-piece plastic insert also includes a cylindrical upstream portion 11 of slightly smaller diameter than the inside wall of the casing.
The cylindrical portion 11 is integral with the disc portion 25 which in tur~
is integral witll the ribs 10. There is, moreover, a lower cylindrical portion 15 integral with the ribs 10, which portion includes a ledge 17 for supporting screen 18 which is prevented from moving upwardly by the projec-tions 19 which are integral with the disc 20. The disc 25 has perforations 26 for directing a plurality of water jets at the screen 18. The efficiency of aeration may be improved by incorporating a bridge 27 such as is sho~7n and described in my aforesaid United States Patent No. 3,363,841 - "Molded l~ater Aerators", granted January 16, 1968, or other turbulent generating means such as described in other of my patents, such as my other United States Patent No. 2,998,929 - "Water Aerators"~ granted September 5, 1961.
By incorporating such a bridge 27 integral with the remainder of the one-piece plastic insert, the water jets are appropriately conditioned so that upon striking the screen lo a very efficient aerating function occurs, thereby reducing the number of screens 18 that are needed for best operation of the aerator. The inlet air enters aro~md the inner wall of the ledge 42, ~05()084 proceeds upstrea~ardly hetweell thc ~ s 10 and enters the mixing space bet-ween the cylindrical disc 25 and the cylindrical portion 15 of the aerator.
While I have referred to the fact that the upstream end of the plastic insert creates a substantial seal against the downstreclm end of the metal faucet 13, it is understood that this seal may not be perfect and that, therefore, there may be some leakage of ~Jater through the seal. If this should occur, a ~lasher may be seated above portion 11, otherwise such water enters the space S between the outer wall of ~he cylindrical portion 11 and the inner ~all of casing 22 and flows downstrean~Jardly towards the main body of the water leaving the aerator. As a result, leakage between the aerator casing 22 and the faucet 13 is avoided. In the modified form of Figure 5, the casing has external threads 33, but the do~Jnstream end of the faucet has an inside ledge against which the cylindrical portion 11 may abut to constitute the substantial seal described above. A somewhat similar arrange-ment for attaching an aerator having external threads to a faucet is shown in severa] of my prior patents, for example, see United States Patent 3,270,965 entitled Self Sealing and Deposit Proof Aerator, granted September 6, 19~6; ~7nited States Pcatent 3>104,827, entitled Vandal~Proof Aerator, granted September 24, 1963; United States Patent 2,998,929, entitled Uater ~erators, granted September 5, 1961, and my aforesaid British and Italian patents.
The aerator of Figure 5 may have inverted cones 50 in place of the perforations 26 and may have a plurality of screens 18 instead of the sirgle screen 18 of Figure 2. Otherwise, the aerators of Figures 1, 2, 3, ar.d 4 on the one hand and Figllre 5 on the other hand are similar. In Figures 1 through 4 and 6, the perforations 26, of diaphragm 25 have a square or arcuate cross-section, as taught in my aforesaid prior United States Patent ~o. 3,130,917.
To enhance the effectiveness of molding the plastic insert in one piece, it is desirable to provide a slit 1~ in the ribs 10. In one form the slit extends from the downstream end of the insert to the lowe. level 1~50084 of the disc 25. In practicc, It has be~n fourld th2t w~len the s]it is approximately 0.3 mm. to 0.5 m~ 7ide, the water will not flood the space bet-ween the inner ~all of casing 13 ar.d the outer wall of cylindrical portlon 15.
Slit 4 allows the cylindrical portions 15 to move outwardly 25 the plastic insert is ren-oved from the nold. To further enhance the removal of the plastic insert from the mold, the ledge 17, for the screen 18, is inclined as shown.
It is noted that ribs 10 extend do~mstrea~wardly beyond the down-stream end of cylindrical portion 15 to provide ample space between inturned ledge 42 and cylindrical portion 15 for a larger quantity of air to enter the aerator.
The casing 22 (or 23) may be made of plastic material, or of elastic material such as rubber instead of metal, in which event the down-stream end of the casing may be distended and the insert placed in the casing through the opening in the downstream end thereof.
The lowermost end of cylindrical portion (ring) 15 should be posi-tioned at least as far upstream as the upstream side of ledge 42.
If the lowermost end of ring 15 is at the same level as, or only slightly upstream of, the upstream side of ledge 42, tl-at ledge should be constructed in the form of spaced teeth, as sh~.~n in my United States Patents No. 2,998,926, granted September 5, 1961, entitled "Aerator ~'ith Improved Air Supply"; No. 2,998,927, granted September 5, 1961, entitled "Fluid Mixing Devices"; No. 3,198,440, granted August 3, 1965, entitled "Aerator Structure and Legged Diaphragm Therefor". This permits air to enter between the teeth and pass between casing 23 and ring 15 to the mixing space downstream of the orifices 26 and/or 50.
Claims (36)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An aerator comprising a casing having threads at its upstream end for attaching the aerator to a faucet, said casing being cylindrical in shape and having an inturned ledge at its downstream end, a generally cylin-drical one-piece plastic insert in said casing having a maximum outside diameter slightly smaller than the inside diameter of said casing, said one-piece insert having an upstream cylindrical portion which engages the faucet when the aerator is screwed onto the faucet, said upstream cylindrical portion including a perforated diaphragm across the path of flow to produce at least one high speed water jet directed in a downstream direction, said one-piece insert also comprising a plurality of spaced ribs that have down-stream ends resting on said ledge and the upstream portions of said ribs being integral with said upstream cylindrical portion of said insert, thereby enabling the plastic insert to be compressed between the downstream end of the faucet and said ledge when the aerator is screwed onto a faucet, said one-piece plastic insert also having a plastic downstream cylindrical sleeve which is integral with the remainder of the insert and extends inside of said ribs and therefore spaced from the inner wall of the casing and also having its upstream end spaced downstream of said upstream cylin-drical portion to thereby define an air path from the downstream end of the casing, through the spaces between said ribs and between the inner side wall of the casing and the outer side wall of the downstream cylindrical sleeve and then over the upstream end of the downstream cylindrical sleeve, and mixing means located in the downstream cylindrical sleeve, said down-stream cylindrical sleeve having at least one slit extending upstream from its downstream end for a substantial distance.
2. An aerator as defined in claim 1 in which said downstream sleeve has a ledge extending inwardly, said mixing means resting on said ledge.
3. An aerator as defined in claim 1 in which said slit passes from the downstream end of ore of said ribs and extends upstream through both said one rib and the downstream sleeve for substantial distance.
4. An aerator as defined in claim 3 in which the slit extends upstream to the downstream end of the upstream cylindrical portion.
5. An aerator as defined in claim 4 in which each rib has a slit therein extending from its downstream end, upstream to the downstream end of the upstream cylindrical portion.
6. An aerator as defined in claim 1 in which the ribs extend farther downstream than said downstream cylindrical sleeve to thereby minimize the impedance of said cylindrical sleeve to flow of air into the aerator.
7. An aerator comprising a casing having threads at its upstream end for attaching the aerator to a faucet, said casing being cylindrical in shape and having an inturned ledge at its downstream end, a generally cylindrical one-piece plastic insert in said casing and having a maximum outside diameter slightly smaller than the inside diameter of said casing, said one-piece insert having an upstream cylindrical portion which engages the faucet when the aerator is screwed onto the faucet, said upstream cylindrical portion including a perforated diaphragm across the path of flow to produce at least one high speed water jet directed in a downstream direction, said one-piece insert also comprising a plurality of spaced ribs that have downstream ends resting on said ledge and the upstream portions of said ribs being integral with said upstream cylindrical portion of said insert, thereby enabling the plastic insert to be compressed between the downstream end of the faucet and said ledge when the aerator is screwed onto a faucet, said one-piece plastic insert also having a plastic downstream cylindrical sleeve which is integral with the remainder of the insert and extends inside of said ribs and therefore spaced from the inner wall of the casing and also having its upstream end spaced downstream of said upstream cylindrical portion to thereby define an air path from the downstream end of the casing, through the spaces between said ribs and bet-ween the inner side wall of the casing and the outer side wall of the down-stream cylindrical sleeve and then over the upstream end of the downstream cylindrical sleeve, and mixing means located in the downstream cylindrical sleeve, said ribs extending farther downstream than said cylindrical sleeve to thus reduce the impedance offered by the sleeve to the flow of air into said aerator.
8. An aerator as defined in claim 7 in which said ribs have slits extending from their downstream ends upstream for a substantial distance, said slits extending through both the ribs and the sleeve.
9. An aerator as defined in claim 8 in which the slits extend upstream to the downstream end of the upstream cylindrical portion.
10. An aerator as defined in claim 1 in which the slit is about 0.3 mm. to 0.5 mm. wide.
11. An aerator as defined in claim 3 in which said slit is about 0.3 mm. to 0.5 mm. wide.
12. An aerator as defined in claim 4 in which said slit is about 0.3 mm. to 0.5 mm. wide.
13. An aerator as defined in claim 5 in which each slit is about 0.3 mm. to 0.5 mm. wide.
14. An aerator as defined in claim 8 in which each slit is no greater than 0.3 mm. to 0.5 mm. wide.
15. An aerator as defined in claim 9 in which each slit is about 0.3 mm. to 0.5 mm. wide.
16. An aerator as defined in claim 1 in which said downstream cylin-drical sleeve has an inturned lip at its downstream end, said mixing means comprising a screen resting on said lip.
17. An aerator as defined in claim 1 in which said downstream cylin-drical sleeve has an inturned lip at its downstream end, said mixing means comprising a screen resting on said lip, said screen having an upper surface, and a projection integral with said diaphragm and extending downstream therefrom to the upper surface of said screen to hold the screen in place.
18. An aerator as defined in claim 1 in which said upstream cylindri-cal portion that engages the faucet comprises a single solid cylindrical member projecting upstream from the diaphragm.
19. An aerator as defined in claim 18 in which said downstream cylin-drical sleeve has an inturned lip at its downstream end, said mixing means comprising a screen resting on said lip, said screen having an upper sur-face, and a projection integral with said diaphragm and extending downstream therefrom to the upper surface of said screen to hold the screen in place.
20. A faucet aerator comprising a casing having means at its upstream end to connect the casing to a source of water under pressure, said casing having an inner wall and also having an inturned ledge at its downstream end, a one-piece molded insert for said casing resting on said inturned ledge, comprising:
(a) a perforated disc for producing a plurality of high velocity streamlets in a downstream direction, (b) a ring, through which the water from said disc flows, having an outside wall the diameter of which is smaller than the inside wall of said casing and having its upper end spaced downstream of the downstream face of said disc, (c) a plurality of spaced supports extending from said ring upstream to said disc to support the disc, and (d) projections on the outer surface of the ring to space the outer wall of the ring from the inner wall of said casing to provide an air-delivery space that allows air flow upstream between the inner wall of said casing and the outer wall of the ring, and mixing means in said ring to aerate the water flowing through the ring, characterized by the lower-most part of said ring being located at least as far upstream as the upstream side of said ledge.
(a) a perforated disc for producing a plurality of high velocity streamlets in a downstream direction, (b) a ring, through which the water from said disc flows, having an outside wall the diameter of which is smaller than the inside wall of said casing and having its upper end spaced downstream of the downstream face of said disc, (c) a plurality of spaced supports extending from said ring upstream to said disc to support the disc, and (d) projections on the outer surface of the ring to space the outer wall of the ring from the inner wall of said casing to provide an air-delivery space that allows air flow upstream between the inner wall of said casing and the outer wall of the ring, and mixing means in said ring to aerate the water flowing through the ring, characterized by the lower-most part of said ring being located at least as far upstream as the upstream side of said ledge.
21. A faucet aerator as defined in claim 20 in which said lowermost part of said ring is upstream of said ledge to form an air inlet to said air-delivery path which is transverse to the direction of water flow and extends between the upstream side of said ledge and the downstream end of said ring.
22. An aerator as defined in claim 21 in which said one-piece molded insert includes a cylindrical projection at its upstream end to support a washer for engaging the faucet to form a seal, said insert being of smaller diameter than the casing downstream the seal so that any water that leaks by the seal may flow down said air-delivery path and be deflected out of the lower end of the aerator by said ledge.
23. An aerator as defined in claim 20 in which said projections and said supports constitute ribs extending from said ledge to said disc.
24. An aerator as defined in claim 23 in which said ribs are thin as compared to their widths, said ribs having slits extending from said ledge upstream at least above said ring so that air may enter said slits at said ledge and flow through the slits to said mixing space.
25. An aerator as defined in claim 23 in which said ribs extend upstream so far that they overlap at least a portion of the outer wall of said disc.
26. An aerator as defined in claim 20 in which said mixing means comprises a screen, said ring having a downstream inturned ledge for supporting said screen, said last-named ledge being part of said one-piece molded insert.
27. An aerator as defined in claim 26 in which said one-piece molded insert includes as an integral part thereof projections extending down-stream from said disc to hold said screen on said ledge.
28. An aerator as defined in claim 20 in which the outer diameter of said ring is no larger than the diameter of the opening defined by said ledge, said projections and supports comprising ribs extending from said disc to said ledge and spacing said ring upstream of the ledge to allow air to enter.
29. An aerator as defined in claim 24 in which said slits extend through both the ribs and the ring.
30. An aerator as defined in claim 20 in which said projections and said supports comprise ribs extending from the disc to said ledge, said ribs having slits therethrough, each of said slits being along a radii of the casing and extending upstream for a limited distance from the downstream end of the ribs.
31. An aerator as defined in claim 30 in which said slits are so narrow as to impair water flow therethrough.
32. An aerator as defined in claim 21 in which the diameter of said disc is not greater than the inner diameter of said ring.
33. An aerator as defined in claim 32 in which at least a portion of said disc extends upstream of said supports.
34. A faucet aerator comprising a casing having means at its upstream end to connect the casing to a source of water under pressure, said casing having an inner wall and also having an inturned ledge at its downstream end, a one-piece molded insert for said casing resting on said inturned ledge, comprising:
(a) a perforated disc for producing a plurality of high velocity streamlets in a downstream direction, (b) a ring, through which the water from said disc flows, having an outside wall the diameter of which is smaller than the inside wall of said casing and having its upper end spaced downstream of the downstream face of said disc, (c) a plurality of spaced supports extending from said ring upstream to said disc to support the disc, and (d) projections on the outer surface of the ring to space the outer wall of the ring from the inner wall of said casing to provide an air-delivery space that allows air flow upstream between the inner wall of said casing and the outer wall of the ring, and mixing means in said ring to aerate the water flowing through the ring, characterized in that the dia-meter of said disc is not greater than the inner diameter of said ring, said disc and the inner wall of said casing defining space which extends downstream from the upstream end of said ring to the upstream end of said insert.
(a) a perforated disc for producing a plurality of high velocity streamlets in a downstream direction, (b) a ring, through which the water from said disc flows, having an outside wall the diameter of which is smaller than the inside wall of said casing and having its upper end spaced downstream of the downstream face of said disc, (c) a plurality of spaced supports extending from said ring upstream to said disc to support the disc, and (d) projections on the outer surface of the ring to space the outer wall of the ring from the inner wall of said casing to provide an air-delivery space that allows air flow upstream between the inner wall of said casing and the outer wall of the ring, and mixing means in said ring to aerate the water flowing through the ring, characterized in that the dia-meter of said disc is not greater than the inner diameter of said ring, said disc and the inner wall of said casing defining space which extends downstream from the upstream end of said ring to the upstream end of said insert.
35. An aerator comprising a casing having threads at its upstream end for attaching the aerator to a faucet, said casing being cylindrical in shape and having an inturned ledge at its downstream end, a generally cylindrical one-piece plastic insert in said casing having a maximum outside diameter slightly smaller than the inside diameter of said casing, said one-piece insert including a perforated diaphragm across the path of flow to produce at least one high speed water jet directed in a downstream direction, said one-piece insert also comprising a plurality of spaced ribs that have downstream ends resting on said ledge and the upstream portions of said ribs being integral with said diaphragm, said one-piece plastic insert also having a plastic downstream cylindrical sleeve which is integral with the remainder of the insert and extends inside of said ribs and therefore spaced from the inner wall of the casing and also having its upstream end spaced downstream of said diaphragm to thereby define an air path from the downstream end of the casing, through the spaces between said ribs and between the inner side wall of the casing and the outer side wall of the downstream cylindrical sleeve and then over the upstream end of the downstream cylindrical sleeve, and mixing means located in the downstream cylindrical sleeve, said downstream cylindrical sleeve having at least one slit extending upstreamwardly from its downstream end for a substantial distance.
36. An aerator comprising a casing having threads at its upstream end for attaching the aerator to a faucet, said casing being cylindrical in shape and having an inturned ledge at its downstream end, a generally cylindrical one-piece plastic insert in said casing and having a maximum outside diameter slightly smaller than the inside diameter of said casing said one-piece plastic insert including a perforated diaphragm across the path of flow to produce at least one high speed water jet directed in a downstream direction, said one-piece insert also comprising a plurality of spaced ribs that have downstream ends resting on said ledge and the upstream portions of said ribs being integral with said diaphragm, said one-piece plastic insert also having a plastic downstream cylindrical sleeve which is integral with the remainder of the insert and extends inside of said ribs and therefore spaced from the inner wall of the casing and also having its upstream end spaced downstream of said diaphragm to thereby define an air path from the downstream end of the casing, through the spaces between said ribs and between the inner side wall of the casing and the outer side wall of the downstream cylindrical sleeve and then over the upstream end of the downstream cylindrical sleeve, and mixing means located in the downstream cylindrical sleeve, said ribs extending farther downstream than said cylindrical sleeve to thus reduce the impedance offered by the sleeve to the flow of air into said aerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,148A CA1050084A (en) | 1977-03-03 | 1977-03-03 | Aerator with metal casing having inner plastic elements moldable in one piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,148A CA1050084A (en) | 1977-03-03 | 1977-03-03 | Aerator with metal casing having inner plastic elements moldable in one piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1050084A true CA1050084A (en) | 1979-03-06 |
Family
ID=4108071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA273,148A Expired CA1050084A (en) | 1977-03-03 | 1977-03-03 | Aerator with metal casing having inner plastic elements moldable in one piece |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1050084A (en) |
-
1977
- 1977-03-03 CA CA273,148A patent/CA1050084A/en not_active Expired
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