US3742521A - Whirlpool attachment for tubs - Google Patents

Whirlpool attachment for tubs Download PDF

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Publication number
US3742521A
US3742521A US00132841A US3742521DA US3742521A US 3742521 A US3742521 A US 3742521A US 00132841 A US00132841 A US 00132841A US 3742521D A US3742521D A US 3742521DA US 3742521 A US3742521 A US 3742521A
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US
United States
Prior art keywords
attachment
orifice
head
mixing chamber
spout
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00132841A
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English (en)
Inventor
E Bolgert
E Weeden
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Kohler Co
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Kohler Co
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Filing date
Publication date
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Publication of US3742521A publication Critical patent/US3742521A/en
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/08—Jet regulators or jet guides, e.g. anti-splash devices
    • E03C1/084—Jet regulators with aerating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H33/00—Bathing devices for special therapeutic or hygienic purposes
    • A61H33/60—Components specifically designed for the therapeutic baths of groups A61H33/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H33/00—Bathing devices for special therapeutic or hygienic purposes
    • A61H33/02—Bathing devices for use with gas-containing liquid, or liquid in which gas is led or generated, e.g. carbon dioxide baths
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/40—Protecting water resources
    • Y02A20/411—Water saving techniques at user level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/75—Flowing liquid aspirates gas

Definitions

  • ABSTRACT A whirlpool attachment for a tub-shower installation [21] Appl. No; 132,841
  • US. Cl. 4/180 includes a fresh water supply line fitted to the tub spout [51] Int. A47k 3/00 in alignment with a diverter valve which closes off the [58] Field of Search......... line when the spout is open.
  • the line leads through a housing to an orifice facing a mixing chamber, and a needle valve is provided to control and close the orifree.
  • the housing defines an air passage which opens References Cited UNITED STATES PATENTS into the chamber and a recirculating passage allows tub water to enter the chamber to provide a combined, aerm ..m mm "huh".
  • Whirlpool devices for home tubs have come into wide use for therapy and relaxation, but most whirlpool units now on the market are independent, electrically powered units which are quite expensive.
  • Some whirlpool attachments have been devised that can be fitted to a conventional tub spout see for example U.S. Pat. No. 3,541,616, issued Nov. 24, i970 but no known attachment of this type fulfills all of the relevant 3 requirements.
  • a device must develop a flow of high rate and turbulence, it must be usable with a standard tub or tub-shower system, it must be easily controllable, it must meet plumbing code regulations, it must be relatively small, simple and inexpensive, and it must be esthetically attractive. All known prior devices are deficient in one or more of these respects.
  • FIG. 1 is a fragmentary side view illustrating a tubshower installation incorporating a whirlpool attachment according to the invention
  • a FIG. 2 is a fragmentary rear view, partially broken away, further illustrating the installation of FIG. 1,
  • FIG. 3 is an enlarged side view, with significant elements shown in cross section, showing the whirlpool attachment of FIG. 1, and
  • FIG. 4 is a fragmentary view in cross section through the plane 44 shown in FIG. 3.
  • FIGS. 1 and 2 The tub-shower installation shown in FIGS. 1 and 2 includes a bathtub 1, one end of which is against a wall 2 that conceals the plumbing system. Behind the wall 2, hot and cold water conduits 3 lead to a common manifold 4 which mounts opposite main valves 5 that control, respectively, the outputs of the two conduits 3 and which extend outwardly through the wall 2 to present control handles 6, only one of the valves 5 and handles 6 being visible in FIG. 1.
  • a shower line 7 is connected to and leads upwardly from the manifold 4 and through the wall 2 to terminate in a shower head 8; and a spout line 9 is connected to and leads downwardly from the manifold 4 and through the wall 2 to a tub spout 10 which is provided with a diverter valve 11.
  • the manifold 4 and lines 7 and 9 together define a branched inlet line for all water admitted through the conduits 3 past the valves 5, the diverter valve 11 serving to control operation as will be described more fully hereinafter.
  • the installation as thus far described is conventional, and such systems, and others in which the invention may be incorporated, are well known to those skilled in the art.
  • the spout 10 is essentially like that shown in U.S. Pat. No. 3,086,748, issued Apr. 23, 1963, to which reference may be had for a complete description. It includes a body 12 defining an inlet 13 to which the spout line 9 is connected and an outlet 14 which empties into the tub 1.
  • a stepped partition 15 extends across the spout body 12 in front of the inlet 13 to divide the body 12 into two chambers, an inlet chamber 16 and an outlet chamber 17.
  • the partition 15 includes a horizontal portion 18 which is provided with a circular flow passage 19 which affords communication between the chambers 16 and 17 and which is opened and closed by the valve 11.
  • the valve 11 includes a suitable disc valve member 20 which is below and movable against the passage 19, the valve 20 being of sufficient size to close off the passage 19.
  • a stem 21 is connected to and leads upwardly from the disc 20 through the upper surface of the spout body 12 to present a manual operating knob 22 by means of which the disc 20 may be moved vertically.
  • the stem 21 is relatively freely reciprocably mounted, so that the disc 20 is normally biased downwardly by gravity to the open position shown in FIG. 1 wherein it is spaced from the passage 19 leaving the latter open. In this condition, fluid under pressure may flow from the chamber 16 to the chamber 17 and out the outlet 14.
  • the manifold 4 includes a conventional aspirator plug 4 threaded into the manifold body and defining a vertical passage 4a at the inlet of the line 7 and diagonal passages 4b which lead toward the line 9.
  • the plug 4' serves in usual fashion to insure that water will not flow up through the line 7 when the valve 11 is open, the passage 4a then serving as an air passage.
  • the disc valve 20 is raised by means of the knob 22, however, the passage 19 will be closed to seal off the chamber 16 from the chamber 17, thus effectively closing the spout 10. Water under pressure will then be directed either through the passage 4a to the line 7 or to the whirlpool attachment as will be described.
  • a baffle 23 extends fowardly from the partition 15 above the passage 19, the stem 21 passing loosely through an opening therein, and serves to develop a low pressure region during flow which prevents leakage around the valve stem 21, all as set forth more fully in U. S. Pat. No. 3,086,748.
  • the whirlpool attachment is seen most clearly in FIG. 3. It includes a fresh water supply line 24 which is generally vertical but which includes a generally horizontal offset portion 25 which allows the attachment to be in proper position in the tub I.
  • the upper end of the line 24 is removably connected to the spout below and in alignment with the diverter valve 11.
  • the removable connection is preferably accomplished through a twopart fitting 26 which includes an upper part 27 that is removably threadedly connected to a second horizontal portion 28 of the partition 15.
  • the part 27 closely surrounds but is not fixed to the upper end of the line 24 and it rests against the upper end of an enlarged collar 29 fixed to the outer surface of the line 24, an O- ring 30 being interposed therebetween to provide a seal.
  • the part 27 has a relatively close fit with a corresponding opening in the bottom wall of the spout body 12, and a second O-ring 31 is seated in a groove on the outer surface of the part 27 to insure an adequate water seal.
  • the part 27 defines an inlet 32 for the line 24, and this is shaped to define an annular shoulder 33 against which the disc valve can seat when it is in its open position as shown in FIG. 3, the line 24 then being closed off.
  • a screen 34 is preferably fitted across the inlet 32.
  • a lock nut 35 forms the second part of the fitting 26 and is threadedly engageable with the lower portion of the part 27.
  • the lock nut 35 fits snugly but rotatably about the line 24, and bears against the lower edge of the collar 29 to compress the seal 30.
  • the whirlpool attachment may readily be removed from the spout 10 by first removing the lock nut 35 and then the fitting part 27. Since the line 24 is rotatable with respect to both parts of the fitting 26, the entire attachment may be rotated about a vertical axis to direct flow in a desired direction, and the fits are tight enough so that it will remain in any selected position. As previously indicated, where it is not desired to use the whirlpool attachment a plug having the general configuration of the fitting part 27 but with a closed end can be threaded into the spout 10.
  • the supply line 24 extends down into a housing designated generally by the reference numeral 36 and made up of a vertical sleeve 37, an upper cap 38, and a lower head 39. Much of the line 24 is disposed within the sleeve 37, and the latter is substantially larger leaving space defining an air passage.
  • the cap 38 has a press fit in the sleeve 37, and it is provided with a cutout 40, seen most clearly in FIG. 4, which receives the line 24 with sufficient spacing to provide an inlet opening at the upper end of the air passage.
  • the cap 38 serves to suppress underwater noises, and also serves an esthetic function.
  • the sleeve 37 and cap 38 together form a vertical portion of the housing which is of substantial length so that the opening 40 will be above the level of water in the tub I when the attachment is in use; and to insure this the vertical portion should extend above the overflow level of the tub l.
  • the head 39 is generally horizontally disposed and includes a generally central, circular, upstanding boss 41 which is threadedly received in the lower end of the sleeve 37.
  • the forward portion of the head 39 defines an outwardly and forwardly opening, horizontally elongated mixing chamber 42 through which the flow afforded by the attachment is discharged into the tub I in the direction of the arrows as shown.
  • a generally central partition 43 is immediately behind the chamber 42, and an orifice 44 is cut through the partition 43 and is in horizontal alignment with the longitudinal axis of the chamber 42.
  • An air opening 45 leads downwardly through the boss 41 in the area circumscribed by the sleeve 37 and thus affords communication between the chamber 42 and the air passage defined by the sleeve.
  • a recirculation passage 46 leads through the bottom of the head 39 into the chamber 42 and is preferably inclined in the direction of output flow.
  • a control valve designated generally by the reference numeral 48 is threadedly mounted in the head 39 behind and in horizontal alignment with the orifice 44 and chamber 42, and includes a needle valve element 49 which is movable toward and away from the orifice 44 and a threaded stem 50 which extends rearwardly through the head 39 to present a manually engageable knob 51.
  • the needle 49 can be moved toward and into the orifice 44 to effectively vary the rate of flow through the line 24, and also serves as a means to close the line 24 completely when it is desired to use the shower.
  • a manually operable shutoff valve 52 of any suitable type is incorporated in the shower line 7, and, with the valve 48, serves to allow the user to select between whirlpool and shower operation.
  • valves 5 If hot, cold, or temperate water is admitted to the system by opening one or both of the valves 5 when the elements are in the normal position shown in FIG. 3, it will flow out through the spout 10 because the line 24 is effectively closed by the valve 20 and the plug 4 in the manifold 4 prevents it from moving upwardly through the line 7.
  • the diverter valve 11 When the diverter valve 11 is closed by lifting the valve 20 upwardly, however, this flow will be blocked and water will become available to either the shower line 7 or the supply line 24.
  • the user wants to use the shower system he will have closed the valve 48 and opened the valve 52, whereupon water under pressure will move up through the line 7 and out through the shower head 8. If it is desired to use the whirlpool attachment, however, the valve 52 will be shut off and the valve 48 will be opened to give the operation described below.
  • a system pressure drop or shutting off the control valves 5 and 6 will allow the valve 11 to drop to open position. While this type of operation as such is generally conventional, it is particularly beneficial in connection with the whirlpool attachment in that in the event of any significant drop in pressure in the supply conduits 3 the valve will automatically drop and close the line 24 to prevent tub water from being drawn into the house water system.
  • This vacuum-break type of operation enables the attachment to comply with plumbing codes.
  • the embodiment of the invention shown has proven to be highly effective, but is still relatively simple and inexpensive and esthetically attractive.
  • the flow of fresh water through the line 24 may readily be controlled by means of the valve 48, so that the user can easily adjust the attachment to give a desired flow.
  • the valve 48 and the shutoff valve 52 the attachment can easily be incorporated into a standard tub shower installation using a two-way diverter valve. Having the chamber 42, orifice 44 and valve 48 in horizontal alignment enables the head 39 to be positioned near the very bottom of the tub 1; this arrangement is preferred, but the valve 48 could be placed at any point along the line 24.
  • the attachment can be used with various types of systems and spout-diverter valve arrangements, and can be connected to the inlet system at any point between the valves 11 and 52. It is not necessarily restricted for use in a tub-shower system as shown, and might, for example, be used in an ordinary tub system by replacing the usual spout with a diverter spout or even by independently connecting the attachment to a water source.
  • the specific structure might be modified, for example by forming the line 24 and sleeve 37 as an integral unit. in view of these and other possible modifications, it is not intended that the invention be limited by the showing herein, or in any other manner, except insofar as is specifically required.
  • a whirlpool attachment of the type adapted to be connected to a tub spout and to introduce a combined flow of fresh water, air, and recirculated water into a tub
  • attachment comprises:
  • a housing including a head at its lower end, said head defining a forwardly opening mixing chamber, the housing also including a tubular vertical portion of substantial length leading upwardly from the head and being closed at its upper end, said tubular vertical portion defining an air passage that opens at its lower end into the rear of the mixing chamber and being provided with a slot in its side beneath and adjacent its closed upper end that defines an upper opening for the air passage;
  • a fresh water supply line including an upper vertical portion that is connectible at its upper end to the tub spout to be rotatable about its longitudinal axis, a generally horizontally extending intermediate portion, the downstream end of which extends through said slot with a substantial clearance, and a lower vertical portion that is disposed within the tubular vertical portion of the housing with a substantial clearance and that terminates at its lower end in an orifice that opens into the rear of the mixing chamber, the lower end of the air passage leading into the mixing chamber at an area downstream of the exit of the orifice; and
  • a water recirculation passage that leads from the exterior of the heat at a bottom location intermediate of the forward and rear portions of said head to enter the mixing chamber at an area that is downstream of the exit of the orifice at least as far as the area where the air passage enters the mixing chamber.
  • the mixing chamber is horizontally elongated with non-converging side walls; the orifice is defined by the head and is located at the inner rear of the mixing chamber; the head is provided with a boss portion above the mixing chamber which is received in the lower end of the tubular vertical portion; there is a water entry passage through the boss portion that is behind and feeds into the orifice and to which the lower end of the water supply line is connected; and there is an air opening through the boss portion in front of the water entry passage that enters the mixing chamber through a side wall at a point immediately to the front of the orifice.
  • the attachment of claim 5 in combination with a tub-shower installation of the type including an inlet line that is branched to define a shower line that leads to a shower head and a spout line that leads to a tub spout, the spout including a diverter valve that is movable between an open position wherein water can flow through the spout and a closed position wherein the spout is effectively closed, wherein: there is a manually operable shutoff valve in the shower line; and the attachment supply line is connected to the inlet line between the diverter valve and shutoff valve; and the control valve is operable to close the supply line.
  • the head has a forward portion that opens horizontally outwardly to define the chamber,the head including an intermediate portion behind the chamber which defines the orifice, the orifice being in horizontal alignment with the chamber, the head also defining an entry passage to the rear of and in communication with the orifice; and the lower end of the supply line is connected to the entry passage; and the control valve is a needle valve which is mounted on the head behind and in horizontal alignment with the orifice and which projects rearwardly through the head to present a manually operable knob.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Therapy (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Nozzles (AREA)
  • Bathtubs, Showers, And Their Attachments (AREA)
US00132841A 1971-04-09 1971-04-09 Whirlpool attachment for tubs Expired - Lifetime US3742521A (en)

Applications Claiming Priority (1)

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US13284171A 1971-04-09 1971-04-09

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US3742521A true US3742521A (en) 1973-07-03

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JP (1) JPS5111996B1 (bs)
CA (1) CA946555A (bs)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823413A (en) * 1988-03-14 1989-04-25 Hydrabaths, Inc. Combined pneumatic switch and air control for use in whirpool baths
US5098614A (en) * 1991-01-14 1992-03-24 Yeh Chiu Tseng L Adjustable bubble bend
US5274860A (en) * 1992-02-24 1994-01-04 Avila Henry G Water conserving shower assembly
US20070194141A1 (en) * 2005-06-15 2007-08-23 Showerstart, Llc Multifunctional restrictive valve
US20070227459A1 (en) * 2004-05-12 2007-10-04 Gould Brad S Fish acclimation transfer line
US20090151060A1 (en) * 2007-11-20 2009-06-18 Zubillaga Edward L Debris entrapment apparatus
US20140131472A1 (en) * 2012-11-05 2014-05-15 Bullfrog Spas Spas and bathing systems with advanced interchangeable jet modules
US9775772B2 (en) 2015-03-03 2017-10-03 Kohler Co. Whirlpool bathtub and purging system
US20180202399A1 (en) * 2017-01-18 2018-07-19 Ford Global Technologies, Llc Multiple orifice aspirator having customer-adjustable flow volume for use with a vacuum system
US10753071B2 (en) 2013-10-09 2020-08-25 Evolve Technologies, Llc Tub faucet having a control valve with reduced backpressure
US10967390B2 (en) 2017-12-01 2021-04-06 Evolve Technologies, Llc Efficient showerhead with purge outlet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55168784U (bs) * 1979-05-23 1980-12-04

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1526179A (en) * 1924-01-26 1925-02-10 Parr Geoffrey Warner Method of aerating or agitating liquids
US2799866A (en) * 1954-07-09 1957-07-23 Petrometer Corp Hydrotherapy apparatus
US3080568A (en) * 1962-08-03 1963-03-12 Harvey L Burnett Portable shower bath assembly
US3084349A (en) * 1961-07-21 1963-04-09 Helmer A Sundblad Tub filler faucet unit valve mount
US3086748A (en) * 1961-05-24 1963-04-23 Kohler Co Diverter spout
US3204254A (en) * 1963-06-07 1965-09-07 Leo F Hotz Bath circulation device
US3430270A (en) * 1966-10-19 1969-03-04 American Standard Inc Plumbing fittings
US3471872A (en) * 1966-09-21 1969-10-14 Symmons Eng Co Plumbing fixture for baths
US3541616A (en) * 1968-07-05 1970-11-24 Virgil A Stricker Hydro-therapy bath device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1526179A (en) * 1924-01-26 1925-02-10 Parr Geoffrey Warner Method of aerating or agitating liquids
US2799866A (en) * 1954-07-09 1957-07-23 Petrometer Corp Hydrotherapy apparatus
US3086748A (en) * 1961-05-24 1963-04-23 Kohler Co Diverter spout
US3084349A (en) * 1961-07-21 1963-04-09 Helmer A Sundblad Tub filler faucet unit valve mount
US3080568A (en) * 1962-08-03 1963-03-12 Harvey L Burnett Portable shower bath assembly
US3204254A (en) * 1963-06-07 1965-09-07 Leo F Hotz Bath circulation device
US3471872A (en) * 1966-09-21 1969-10-14 Symmons Eng Co Plumbing fixture for baths
US3430270A (en) * 1966-10-19 1969-03-04 American Standard Inc Plumbing fittings
US3541616A (en) * 1968-07-05 1970-11-24 Virgil A Stricker Hydro-therapy bath device

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823413A (en) * 1988-03-14 1989-04-25 Hydrabaths, Inc. Combined pneumatic switch and air control for use in whirpool baths
US5098614A (en) * 1991-01-14 1992-03-24 Yeh Chiu Tseng L Adjustable bubble bend
US5274860A (en) * 1992-02-24 1994-01-04 Avila Henry G Water conserving shower assembly
US20070227459A1 (en) * 2004-05-12 2007-10-04 Gould Brad S Fish acclimation transfer line
US7878417B2 (en) * 2005-06-15 2011-02-01 Showerstart, Llc Multifunctional restrictive valve
US20070194141A1 (en) * 2005-06-15 2007-08-23 Showerstart, Llc Multifunctional restrictive valve
US8434693B2 (en) 2006-04-25 2013-05-07 Showerstart Llc Multifunctional restrictive valve
US20110079296A1 (en) * 2006-04-25 2011-04-07 Michael Brown multifunctional restrictive valve
US20090151060A1 (en) * 2007-11-20 2009-06-18 Zubillaga Edward L Debris entrapment apparatus
US20140131472A1 (en) * 2012-11-05 2014-05-15 Bullfrog Spas Spas and bathing systems with advanced interchangeable jet modules
AU2013337267B2 (en) * 2012-11-05 2016-11-24 Bullfrog International, L.C. Spas and bathing systems with advanced interchangeable jet modules
US9662268B2 (en) * 2012-11-05 2017-05-30 Richard Alex Eddington Spas and bathing systems with advanced interchangeable jet modules
US10753071B2 (en) 2013-10-09 2020-08-25 Evolve Technologies, Llc Tub faucet having a control valve with reduced backpressure
US11492787B2 (en) 2013-10-09 2022-11-08 Evolve Technologies, Llc Tub faucet having a control valve with reduced backpressure
US9775772B2 (en) 2015-03-03 2017-10-03 Kohler Co. Whirlpool bathtub and purging system
US10071018B2 (en) 2015-03-03 2018-09-11 Kohler Co. Whirlpool bathtub and purging system
US20180202399A1 (en) * 2017-01-18 2018-07-19 Ford Global Technologies, Llc Multiple orifice aspirator having customer-adjustable flow volume for use with a vacuum system
US10967390B2 (en) 2017-12-01 2021-04-06 Evolve Technologies, Llc Efficient showerhead with purge outlet
US11833529B2 (en) 2017-12-01 2023-12-05 Am Conservation Group Efficient showerhead with purge outlet

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Publication number Publication date
CA946555A (en) 1974-05-07
JPS5111996B1 (bs) 1976-04-15

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